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4773 lines
120 KiB
4773 lines
120 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright (C) 2002 Richard Henderson |
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* Copyright (C) 2001 Rusty Russell, 2002, 2010 Rusty Russell IBM. |
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*/ |
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|
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#define INCLUDE_VERMAGIC |
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|
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#include <linux/export.h> |
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#include <linux/extable.h> |
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#include <linux/moduleloader.h> |
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#include <linux/module_signature.h> |
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#include <linux/trace_events.h> |
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#include <linux/init.h> |
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#include <linux/kallsyms.h> |
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#include <linux/buildid.h> |
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#include <linux/file.h> |
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#include <linux/fs.h> |
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#include <linux/sysfs.h> |
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#include <linux/kernel.h> |
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#include <linux/kernel_read_file.h> |
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#include <linux/slab.h> |
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#include <linux/vmalloc.h> |
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#include <linux/elf.h> |
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#include <linux/proc_fs.h> |
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#include <linux/security.h> |
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#include <linux/seq_file.h> |
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#include <linux/syscalls.h> |
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#include <linux/fcntl.h> |
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#include <linux/rcupdate.h> |
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#include <linux/capability.h> |
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#include <linux/cpu.h> |
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#include <linux/moduleparam.h> |
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#include <linux/errno.h> |
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#include <linux/err.h> |
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#include <linux/vermagic.h> |
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#include <linux/notifier.h> |
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#include <linux/sched.h> |
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#include <linux/device.h> |
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#include <linux/string.h> |
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#include <linux/mutex.h> |
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#include <linux/rculist.h> |
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#include <linux/uaccess.h> |
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#include <asm/cacheflush.h> |
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#include <linux/set_memory.h> |
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#include <asm/mmu_context.h> |
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#include <linux/license.h> |
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#include <asm/sections.h> |
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#include <linux/tracepoint.h> |
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#include <linux/ftrace.h> |
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#include <linux/livepatch.h> |
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#include <linux/async.h> |
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#include <linux/percpu.h> |
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#include <linux/kmemleak.h> |
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#include <linux/jump_label.h> |
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#include <linux/pfn.h> |
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#include <linux/bsearch.h> |
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#include <linux/dynamic_debug.h> |
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#include <linux/audit.h> |
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#include <uapi/linux/module.h> |
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#include "module-internal.h" |
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|
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#define CREATE_TRACE_POINTS |
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#include <trace/events/module.h> |
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#ifndef ARCH_SHF_SMALL |
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#define ARCH_SHF_SMALL 0 |
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#endif |
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/* |
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* Modules' sections will be aligned on page boundaries |
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* to ensure complete separation of code and data, but |
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* only when CONFIG_ARCH_HAS_STRICT_MODULE_RWX=y |
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*/ |
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#ifdef CONFIG_ARCH_HAS_STRICT_MODULE_RWX |
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# define debug_align(X) ALIGN(X, PAGE_SIZE) |
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#else |
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# define debug_align(X) (X) |
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#endif |
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/* If this is set, the section belongs in the init part of the module */ |
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#define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1)) |
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/* |
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* Mutex protects: |
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* 1) List of modules (also safely readable with preempt_disable), |
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* 2) module_use links, |
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* 3) module_addr_min/module_addr_max. |
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* (delete and add uses RCU list operations). |
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*/ |
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static DEFINE_MUTEX(module_mutex); |
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static LIST_HEAD(modules); |
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/* Work queue for freeing init sections in success case */ |
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static void do_free_init(struct work_struct *w); |
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static DECLARE_WORK(init_free_wq, do_free_init); |
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static LLIST_HEAD(init_free_list); |
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#ifdef CONFIG_MODULES_TREE_LOOKUP |
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/* |
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* Use a latched RB-tree for __module_address(); this allows us to use |
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* RCU-sched lookups of the address from any context. |
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* |
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* This is conditional on PERF_EVENTS || TRACING because those can really hit |
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* __module_address() hard by doing a lot of stack unwinding; potentially from |
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* NMI context. |
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*/ |
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static __always_inline unsigned long __mod_tree_val(struct latch_tree_node *n) |
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{ |
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struct module_layout *layout = container_of(n, struct module_layout, mtn.node); |
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return (unsigned long)layout->base; |
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} |
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static __always_inline unsigned long __mod_tree_size(struct latch_tree_node *n) |
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{ |
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struct module_layout *layout = container_of(n, struct module_layout, mtn.node); |
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return (unsigned long)layout->size; |
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} |
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static __always_inline bool |
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mod_tree_less(struct latch_tree_node *a, struct latch_tree_node *b) |
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{ |
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return __mod_tree_val(a) < __mod_tree_val(b); |
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} |
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static __always_inline int |
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mod_tree_comp(void *key, struct latch_tree_node *n) |
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{ |
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unsigned long val = (unsigned long)key; |
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unsigned long start, end; |
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start = __mod_tree_val(n); |
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if (val < start) |
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return -1; |
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end = start + __mod_tree_size(n); |
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if (val >= end) |
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return 1; |
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return 0; |
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} |
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static const struct latch_tree_ops mod_tree_ops = { |
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.less = mod_tree_less, |
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.comp = mod_tree_comp, |
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}; |
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static struct mod_tree_root { |
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struct latch_tree_root root; |
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unsigned long addr_min; |
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unsigned long addr_max; |
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} mod_tree __cacheline_aligned = { |
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.addr_min = -1UL, |
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}; |
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#define module_addr_min mod_tree.addr_min |
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#define module_addr_max mod_tree.addr_max |
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static noinline void __mod_tree_insert(struct mod_tree_node *node) |
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{ |
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latch_tree_insert(&node->node, &mod_tree.root, &mod_tree_ops); |
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} |
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static void __mod_tree_remove(struct mod_tree_node *node) |
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{ |
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latch_tree_erase(&node->node, &mod_tree.root, &mod_tree_ops); |
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} |
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/* |
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* These modifications: insert, remove_init and remove; are serialized by the |
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* module_mutex. |
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*/ |
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static void mod_tree_insert(struct module *mod) |
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{ |
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mod->core_layout.mtn.mod = mod; |
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mod->init_layout.mtn.mod = mod; |
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__mod_tree_insert(&mod->core_layout.mtn); |
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if (mod->init_layout.size) |
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__mod_tree_insert(&mod->init_layout.mtn); |
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} |
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static void mod_tree_remove_init(struct module *mod) |
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{ |
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if (mod->init_layout.size) |
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__mod_tree_remove(&mod->init_layout.mtn); |
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} |
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static void mod_tree_remove(struct module *mod) |
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{ |
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__mod_tree_remove(&mod->core_layout.mtn); |
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mod_tree_remove_init(mod); |
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} |
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static struct module *mod_find(unsigned long addr) |
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{ |
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struct latch_tree_node *ltn; |
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ltn = latch_tree_find((void *)addr, &mod_tree.root, &mod_tree_ops); |
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if (!ltn) |
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return NULL; |
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return container_of(ltn, struct mod_tree_node, node)->mod; |
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} |
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#else /* MODULES_TREE_LOOKUP */ |
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static unsigned long module_addr_min = -1UL, module_addr_max = 0; |
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static void mod_tree_insert(struct module *mod) { } |
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static void mod_tree_remove_init(struct module *mod) { } |
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static void mod_tree_remove(struct module *mod) { } |
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static struct module *mod_find(unsigned long addr) |
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{ |
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struct module *mod; |
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list_for_each_entry_rcu(mod, &modules, list, |
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lockdep_is_held(&module_mutex)) { |
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if (within_module(addr, mod)) |
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return mod; |
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} |
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return NULL; |
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} |
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#endif /* MODULES_TREE_LOOKUP */ |
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/* |
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* Bounds of module text, for speeding up __module_address. |
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* Protected by module_mutex. |
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*/ |
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static void __mod_update_bounds(void *base, unsigned int size) |
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{ |
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unsigned long min = (unsigned long)base; |
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unsigned long max = min + size; |
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if (min < module_addr_min) |
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module_addr_min = min; |
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if (max > module_addr_max) |
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module_addr_max = max; |
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} |
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static void mod_update_bounds(struct module *mod) |
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{ |
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__mod_update_bounds(mod->core_layout.base, mod->core_layout.size); |
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if (mod->init_layout.size) |
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__mod_update_bounds(mod->init_layout.base, mod->init_layout.size); |
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} |
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#ifdef CONFIG_KGDB_KDB |
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struct list_head *kdb_modules = &modules; /* kdb needs the list of modules */ |
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#endif /* CONFIG_KGDB_KDB */ |
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static void module_assert_mutex_or_preempt(void) |
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{ |
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#ifdef CONFIG_LOCKDEP |
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if (unlikely(!debug_locks)) |
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return; |
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WARN_ON_ONCE(!rcu_read_lock_sched_held() && |
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!lockdep_is_held(&module_mutex)); |
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#endif |
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} |
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#ifdef CONFIG_MODULE_SIG |
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static bool sig_enforce = IS_ENABLED(CONFIG_MODULE_SIG_FORCE); |
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module_param(sig_enforce, bool_enable_only, 0644); |
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|
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void set_module_sig_enforced(void) |
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{ |
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sig_enforce = true; |
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} |
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#else |
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#define sig_enforce false |
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#endif |
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/* |
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* Export sig_enforce kernel cmdline parameter to allow other subsystems rely |
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* on that instead of directly to CONFIG_MODULE_SIG_FORCE config. |
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*/ |
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bool is_module_sig_enforced(void) |
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{ |
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return sig_enforce; |
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} |
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EXPORT_SYMBOL(is_module_sig_enforced); |
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/* Block module loading/unloading? */ |
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int modules_disabled = 0; |
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core_param(nomodule, modules_disabled, bint, 0); |
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/* Waiting for a module to finish initializing? */ |
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static DECLARE_WAIT_QUEUE_HEAD(module_wq); |
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static BLOCKING_NOTIFIER_HEAD(module_notify_list); |
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int register_module_notifier(struct notifier_block *nb) |
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{ |
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return blocking_notifier_chain_register(&module_notify_list, nb); |
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} |
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EXPORT_SYMBOL(register_module_notifier); |
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int unregister_module_notifier(struct notifier_block *nb) |
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{ |
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return blocking_notifier_chain_unregister(&module_notify_list, nb); |
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} |
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EXPORT_SYMBOL(unregister_module_notifier); |
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/* |
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* We require a truly strong try_module_get(): 0 means success. |
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* Otherwise an error is returned due to ongoing or failed |
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* initialization etc. |
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*/ |
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static inline int strong_try_module_get(struct module *mod) |
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{ |
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BUG_ON(mod && mod->state == MODULE_STATE_UNFORMED); |
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if (mod && mod->state == MODULE_STATE_COMING) |
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return -EBUSY; |
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if (try_module_get(mod)) |
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return 0; |
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else |
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return -ENOENT; |
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} |
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static inline void add_taint_module(struct module *mod, unsigned flag, |
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enum lockdep_ok lockdep_ok) |
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{ |
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add_taint(flag, lockdep_ok); |
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set_bit(flag, &mod->taints); |
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} |
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/* |
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* A thread that wants to hold a reference to a module only while it |
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* is running can call this to safely exit. nfsd and lockd use this. |
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*/ |
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void __noreturn __module_put_and_exit(struct module *mod, long code) |
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{ |
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module_put(mod); |
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do_exit(code); |
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} |
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EXPORT_SYMBOL(__module_put_and_exit); |
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|
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/* Find a module section: 0 means not found. */ |
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static unsigned int find_sec(const struct load_info *info, const char *name) |
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{ |
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unsigned int i; |
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for (i = 1; i < info->hdr->e_shnum; i++) { |
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Elf_Shdr *shdr = &info->sechdrs[i]; |
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/* Alloc bit cleared means "ignore it." */ |
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if ((shdr->sh_flags & SHF_ALLOC) |
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&& strcmp(info->secstrings + shdr->sh_name, name) == 0) |
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return i; |
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} |
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return 0; |
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} |
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/* Find a module section, or NULL. */ |
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static void *section_addr(const struct load_info *info, const char *name) |
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{ |
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/* Section 0 has sh_addr 0. */ |
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return (void *)info->sechdrs[find_sec(info, name)].sh_addr; |
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} |
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|
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/* Find a module section, or NULL. Fill in number of "objects" in section. */ |
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static void *section_objs(const struct load_info *info, |
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const char *name, |
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size_t object_size, |
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unsigned int *num) |
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{ |
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unsigned int sec = find_sec(info, name); |
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/* Section 0 has sh_addr 0 and sh_size 0. */ |
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*num = info->sechdrs[sec].sh_size / object_size; |
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return (void *)info->sechdrs[sec].sh_addr; |
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} |
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/* Find a module section: 0 means not found. Ignores SHF_ALLOC flag. */ |
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static unsigned int find_any_sec(const struct load_info *info, const char *name) |
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{ |
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unsigned int i; |
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for (i = 1; i < info->hdr->e_shnum; i++) { |
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Elf_Shdr *shdr = &info->sechdrs[i]; |
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if (strcmp(info->secstrings + shdr->sh_name, name) == 0) |
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return i; |
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} |
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return 0; |
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} |
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/* |
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* Find a module section, or NULL. Fill in number of "objects" in section. |
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* Ignores SHF_ALLOC flag. |
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*/ |
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static __maybe_unused void *any_section_objs(const struct load_info *info, |
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const char *name, |
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size_t object_size, |
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unsigned int *num) |
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{ |
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unsigned int sec = find_any_sec(info, name); |
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/* Section 0 has sh_addr 0 and sh_size 0. */ |
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*num = info->sechdrs[sec].sh_size / object_size; |
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return (void *)info->sechdrs[sec].sh_addr; |
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} |
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/* Provided by the linker */ |
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extern const struct kernel_symbol __start___ksymtab[]; |
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extern const struct kernel_symbol __stop___ksymtab[]; |
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extern const struct kernel_symbol __start___ksymtab_gpl[]; |
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extern const struct kernel_symbol __stop___ksymtab_gpl[]; |
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extern const s32 __start___kcrctab[]; |
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extern const s32 __start___kcrctab_gpl[]; |
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#ifndef CONFIG_MODVERSIONS |
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#define symversion(base, idx) NULL |
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#else |
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#define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL) |
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#endif |
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struct symsearch { |
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const struct kernel_symbol *start, *stop; |
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const s32 *crcs; |
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enum mod_license { |
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NOT_GPL_ONLY, |
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GPL_ONLY, |
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} license; |
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}; |
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struct find_symbol_arg { |
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/* Input */ |
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const char *name; |
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bool gplok; |
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bool warn; |
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/* Output */ |
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struct module *owner; |
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const s32 *crc; |
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const struct kernel_symbol *sym; |
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enum mod_license license; |
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}; |
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static bool check_exported_symbol(const struct symsearch *syms, |
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struct module *owner, |
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unsigned int symnum, void *data) |
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{ |
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struct find_symbol_arg *fsa = data; |
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if (!fsa->gplok && syms->license == GPL_ONLY) |
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return false; |
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fsa->owner = owner; |
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fsa->crc = symversion(syms->crcs, symnum); |
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fsa->sym = &syms->start[symnum]; |
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fsa->license = syms->license; |
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return true; |
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} |
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static unsigned long kernel_symbol_value(const struct kernel_symbol *sym) |
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{ |
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#ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS |
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return (unsigned long)offset_to_ptr(&sym->value_offset); |
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#else |
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return sym->value; |
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#endif |
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} |
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static const char *kernel_symbol_name(const struct kernel_symbol *sym) |
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{ |
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#ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS |
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return offset_to_ptr(&sym->name_offset); |
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#else |
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return sym->name; |
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#endif |
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} |
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static const char *kernel_symbol_namespace(const struct kernel_symbol *sym) |
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{ |
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#ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS |
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if (!sym->namespace_offset) |
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return NULL; |
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return offset_to_ptr(&sym->namespace_offset); |
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#else |
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return sym->namespace; |
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#endif |
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} |
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static int cmp_name(const void *name, const void *sym) |
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{ |
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return strcmp(name, kernel_symbol_name(sym)); |
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} |
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|
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static bool find_exported_symbol_in_section(const struct symsearch *syms, |
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struct module *owner, |
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void *data) |
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{ |
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struct find_symbol_arg *fsa = data; |
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struct kernel_symbol *sym; |
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|
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sym = bsearch(fsa->name, syms->start, syms->stop - syms->start, |
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sizeof(struct kernel_symbol), cmp_name); |
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|
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if (sym != NULL && check_exported_symbol(syms, owner, |
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sym - syms->start, data)) |
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return true; |
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|
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return false; |
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} |
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|
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/* |
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* Find an exported symbol and return it, along with, (optional) crc and |
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* (optional) module which owns it. Needs preempt disabled or module_mutex. |
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*/ |
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static bool find_symbol(struct find_symbol_arg *fsa) |
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{ |
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static const struct symsearch arr[] = { |
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{ __start___ksymtab, __stop___ksymtab, __start___kcrctab, |
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NOT_GPL_ONLY }, |
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{ __start___ksymtab_gpl, __stop___ksymtab_gpl, |
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__start___kcrctab_gpl, |
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GPL_ONLY }, |
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}; |
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struct module *mod; |
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unsigned int i; |
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|
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module_assert_mutex_or_preempt(); |
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|
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for (i = 0; i < ARRAY_SIZE(arr); i++) |
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if (find_exported_symbol_in_section(&arr[i], NULL, fsa)) |
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return true; |
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|
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list_for_each_entry_rcu(mod, &modules, list, |
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lockdep_is_held(&module_mutex)) { |
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struct symsearch arr[] = { |
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{ mod->syms, mod->syms + mod->num_syms, mod->crcs, |
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NOT_GPL_ONLY }, |
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{ mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms, |
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mod->gpl_crcs, |
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GPL_ONLY }, |
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}; |
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|
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if (mod->state == MODULE_STATE_UNFORMED) |
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continue; |
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|
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for (i = 0; i < ARRAY_SIZE(arr); i++) |
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if (find_exported_symbol_in_section(&arr[i], mod, fsa)) |
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return true; |
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} |
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|
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pr_debug("Failed to find symbol %s\n", fsa->name); |
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return false; |
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} |
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|
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/* |
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* Search for module by name: must hold module_mutex (or preempt disabled |
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* for read-only access). |
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*/ |
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static struct module *find_module_all(const char *name, size_t len, |
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bool even_unformed) |
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{ |
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struct module *mod; |
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|
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module_assert_mutex_or_preempt(); |
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|
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list_for_each_entry_rcu(mod, &modules, list, |
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lockdep_is_held(&module_mutex)) { |
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if (!even_unformed && mod->state == MODULE_STATE_UNFORMED) |
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continue; |
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if (strlen(mod->name) == len && !memcmp(mod->name, name, len)) |
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return mod; |
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} |
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return NULL; |
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} |
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|
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struct module *find_module(const char *name) |
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{ |
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return find_module_all(name, strlen(name), false); |
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} |
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|
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#ifdef CONFIG_SMP |
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|
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static inline void __percpu *mod_percpu(struct module *mod) |
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{ |
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return mod->percpu; |
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} |
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|
|
static int percpu_modalloc(struct module *mod, struct load_info *info) |
|
{ |
|
Elf_Shdr *pcpusec = &info->sechdrs[info->index.pcpu]; |
|
unsigned long align = pcpusec->sh_addralign; |
|
|
|
if (!pcpusec->sh_size) |
|
return 0; |
|
|
|
if (align > PAGE_SIZE) { |
|
pr_warn("%s: per-cpu alignment %li > %li\n", |
|
mod->name, align, PAGE_SIZE); |
|
align = PAGE_SIZE; |
|
} |
|
|
|
mod->percpu = __alloc_reserved_percpu(pcpusec->sh_size, align); |
|
if (!mod->percpu) { |
|
pr_warn("%s: Could not allocate %lu bytes percpu data\n", |
|
mod->name, (unsigned long)pcpusec->sh_size); |
|
return -ENOMEM; |
|
} |
|
mod->percpu_size = pcpusec->sh_size; |
|
return 0; |
|
} |
|
|
|
static void percpu_modfree(struct module *mod) |
|
{ |
|
free_percpu(mod->percpu); |
|
} |
|
|
|
static unsigned int find_pcpusec(struct load_info *info) |
|
{ |
|
return find_sec(info, ".data..percpu"); |
|
} |
|
|
|
static void percpu_modcopy(struct module *mod, |
|
const void *from, unsigned long size) |
|
{ |
|
int cpu; |
|
|
|
for_each_possible_cpu(cpu) |
|
memcpy(per_cpu_ptr(mod->percpu, cpu), from, size); |
|
} |
|
|
|
bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr) |
|
{ |
|
struct module *mod; |
|
unsigned int cpu; |
|
|
|
preempt_disable(); |
|
|
|
list_for_each_entry_rcu(mod, &modules, list) { |
|
if (mod->state == MODULE_STATE_UNFORMED) |
|
continue; |
|
if (!mod->percpu_size) |
|
continue; |
|
for_each_possible_cpu(cpu) { |
|
void *start = per_cpu_ptr(mod->percpu, cpu); |
|
void *va = (void *)addr; |
|
|
|
if (va >= start && va < start + mod->percpu_size) { |
|
if (can_addr) { |
|
*can_addr = (unsigned long) (va - start); |
|
*can_addr += (unsigned long) |
|
per_cpu_ptr(mod->percpu, |
|
get_boot_cpu_id()); |
|
} |
|
preempt_enable(); |
|
return true; |
|
} |
|
} |
|
} |
|
|
|
preempt_enable(); |
|
return false; |
|
} |
|
|
|
/** |
|
* is_module_percpu_address() - test whether address is from module static percpu |
|
* @addr: address to test |
|
* |
|
* Test whether @addr belongs to module static percpu area. |
|
* |
|
* Return: %true if @addr is from module static percpu area |
|
*/ |
|
bool is_module_percpu_address(unsigned long addr) |
|
{ |
|
return __is_module_percpu_address(addr, NULL); |
|
} |
|
|
|
#else /* ... !CONFIG_SMP */ |
|
|
|
static inline void __percpu *mod_percpu(struct module *mod) |
|
{ |
|
return NULL; |
|
} |
|
static int percpu_modalloc(struct module *mod, struct load_info *info) |
|
{ |
|
/* UP modules shouldn't have this section: ENOMEM isn't quite right */ |
|
if (info->sechdrs[info->index.pcpu].sh_size != 0) |
|
return -ENOMEM; |
|
return 0; |
|
} |
|
static inline void percpu_modfree(struct module *mod) |
|
{ |
|
} |
|
static unsigned int find_pcpusec(struct load_info *info) |
|
{ |
|
return 0; |
|
} |
|
static inline void percpu_modcopy(struct module *mod, |
|
const void *from, unsigned long size) |
|
{ |
|
/* pcpusec should be 0, and size of that section should be 0. */ |
|
BUG_ON(size != 0); |
|
} |
|
bool is_module_percpu_address(unsigned long addr) |
|
{ |
|
return false; |
|
} |
|
|
|
bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr) |
|
{ |
|
return false; |
|
} |
|
|
|
#endif /* CONFIG_SMP */ |
|
|
|
#define MODINFO_ATTR(field) \ |
|
static void setup_modinfo_##field(struct module *mod, const char *s) \ |
|
{ \ |
|
mod->field = kstrdup(s, GFP_KERNEL); \ |
|
} \ |
|
static ssize_t show_modinfo_##field(struct module_attribute *mattr, \ |
|
struct module_kobject *mk, char *buffer) \ |
|
{ \ |
|
return scnprintf(buffer, PAGE_SIZE, "%s\n", mk->mod->field); \ |
|
} \ |
|
static int modinfo_##field##_exists(struct module *mod) \ |
|
{ \ |
|
return mod->field != NULL; \ |
|
} \ |
|
static void free_modinfo_##field(struct module *mod) \ |
|
{ \ |
|
kfree(mod->field); \ |
|
mod->field = NULL; \ |
|
} \ |
|
static struct module_attribute modinfo_##field = { \ |
|
.attr = { .name = __stringify(field), .mode = 0444 }, \ |
|
.show = show_modinfo_##field, \ |
|
.setup = setup_modinfo_##field, \ |
|
.test = modinfo_##field##_exists, \ |
|
.free = free_modinfo_##field, \ |
|
}; |
|
|
|
MODINFO_ATTR(version); |
|
MODINFO_ATTR(srcversion); |
|
|
|
static char last_unloaded_module[MODULE_NAME_LEN+1]; |
|
|
|
#ifdef CONFIG_MODULE_UNLOAD |
|
|
|
EXPORT_TRACEPOINT_SYMBOL(module_get); |
|
|
|
/* MODULE_REF_BASE is the base reference count by kmodule loader. */ |
|
#define MODULE_REF_BASE 1 |
|
|
|
/* Init the unload section of the module. */ |
|
static int module_unload_init(struct module *mod) |
|
{ |
|
/* |
|
* Initialize reference counter to MODULE_REF_BASE. |
|
* refcnt == 0 means module is going. |
|
*/ |
|
atomic_set(&mod->refcnt, MODULE_REF_BASE); |
|
|
|
INIT_LIST_HEAD(&mod->source_list); |
|
INIT_LIST_HEAD(&mod->target_list); |
|
|
|
/* Hold reference count during initialization. */ |
|
atomic_inc(&mod->refcnt); |
|
|
|
return 0; |
|
} |
|
|
|
/* Does a already use b? */ |
|
static int already_uses(struct module *a, struct module *b) |
|
{ |
|
struct module_use *use; |
|
|
|
list_for_each_entry(use, &b->source_list, source_list) { |
|
if (use->source == a) { |
|
pr_debug("%s uses %s!\n", a->name, b->name); |
|
return 1; |
|
} |
|
} |
|
pr_debug("%s does not use %s!\n", a->name, b->name); |
|
return 0; |
|
} |
|
|
|
/* |
|
* Module a uses b |
|
* - we add 'a' as a "source", 'b' as a "target" of module use |
|
* - the module_use is added to the list of 'b' sources (so |
|
* 'b' can walk the list to see who sourced them), and of 'a' |
|
* targets (so 'a' can see what modules it targets). |
|
*/ |
|
static int add_module_usage(struct module *a, struct module *b) |
|
{ |
|
struct module_use *use; |
|
|
|
pr_debug("Allocating new usage for %s.\n", a->name); |
|
use = kmalloc(sizeof(*use), GFP_ATOMIC); |
|
if (!use) |
|
return -ENOMEM; |
|
|
|
use->source = a; |
|
use->target = b; |
|
list_add(&use->source_list, &b->source_list); |
|
list_add(&use->target_list, &a->target_list); |
|
return 0; |
|
} |
|
|
|
/* Module a uses b: caller needs module_mutex() */ |
|
static int ref_module(struct module *a, struct module *b) |
|
{ |
|
int err; |
|
|
|
if (b == NULL || already_uses(a, b)) |
|
return 0; |
|
|
|
/* If module isn't available, we fail. */ |
|
err = strong_try_module_get(b); |
|
if (err) |
|
return err; |
|
|
|
err = add_module_usage(a, b); |
|
if (err) { |
|
module_put(b); |
|
return err; |
|
} |
|
return 0; |
|
} |
|
|
|
/* Clear the unload stuff of the module. */ |
|
static void module_unload_free(struct module *mod) |
|
{ |
|
struct module_use *use, *tmp; |
|
|
|
mutex_lock(&module_mutex); |
|
list_for_each_entry_safe(use, tmp, &mod->target_list, target_list) { |
|
struct module *i = use->target; |
|
pr_debug("%s unusing %s\n", mod->name, i->name); |
|
module_put(i); |
|
list_del(&use->source_list); |
|
list_del(&use->target_list); |
|
kfree(use); |
|
} |
|
mutex_unlock(&module_mutex); |
|
} |
|
|
|
#ifdef CONFIG_MODULE_FORCE_UNLOAD |
|
static inline int try_force_unload(unsigned int flags) |
|
{ |
|
int ret = (flags & O_TRUNC); |
|
if (ret) |
|
add_taint(TAINT_FORCED_RMMOD, LOCKDEP_NOW_UNRELIABLE); |
|
return ret; |
|
} |
|
#else |
|
static inline int try_force_unload(unsigned int flags) |
|
{ |
|
return 0; |
|
} |
|
#endif /* CONFIG_MODULE_FORCE_UNLOAD */ |
|
|
|
/* Try to release refcount of module, 0 means success. */ |
|
static int try_release_module_ref(struct module *mod) |
|
{ |
|
int ret; |
|
|
|
/* Try to decrement refcnt which we set at loading */ |
|
ret = atomic_sub_return(MODULE_REF_BASE, &mod->refcnt); |
|
BUG_ON(ret < 0); |
|
if (ret) |
|
/* Someone can put this right now, recover with checking */ |
|
ret = atomic_add_unless(&mod->refcnt, MODULE_REF_BASE, 0); |
|
|
|
return ret; |
|
} |
|
|
|
static int try_stop_module(struct module *mod, int flags, int *forced) |
|
{ |
|
/* If it's not unused, quit unless we're forcing. */ |
|
if (try_release_module_ref(mod) != 0) { |
|
*forced = try_force_unload(flags); |
|
if (!(*forced)) |
|
return -EWOULDBLOCK; |
|
} |
|
|
|
/* Mark it as dying. */ |
|
mod->state = MODULE_STATE_GOING; |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* module_refcount() - return the refcount or -1 if unloading |
|
* @mod: the module we're checking |
|
* |
|
* Return: |
|
* -1 if the module is in the process of unloading |
|
* otherwise the number of references in the kernel to the module |
|
*/ |
|
int module_refcount(struct module *mod) |
|
{ |
|
return atomic_read(&mod->refcnt) - MODULE_REF_BASE; |
|
} |
|
EXPORT_SYMBOL(module_refcount); |
|
|
|
/* This exists whether we can unload or not */ |
|
static void free_module(struct module *mod); |
|
|
|
SYSCALL_DEFINE2(delete_module, const char __user *, name_user, |
|
unsigned int, flags) |
|
{ |
|
struct module *mod; |
|
char name[MODULE_NAME_LEN]; |
|
int ret, forced = 0; |
|
|
|
if (!capable(CAP_SYS_MODULE) || modules_disabled) |
|
return -EPERM; |
|
|
|
if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0) |
|
return -EFAULT; |
|
name[MODULE_NAME_LEN-1] = '\0'; |
|
|
|
audit_log_kern_module(name); |
|
|
|
if (mutex_lock_interruptible(&module_mutex) != 0) |
|
return -EINTR; |
|
|
|
mod = find_module(name); |
|
if (!mod) { |
|
ret = -ENOENT; |
|
goto out; |
|
} |
|
|
|
if (!list_empty(&mod->source_list)) { |
|
/* Other modules depend on us: get rid of them first. */ |
|
ret = -EWOULDBLOCK; |
|
goto out; |
|
} |
|
|
|
/* Doing init or already dying? */ |
|
if (mod->state != MODULE_STATE_LIVE) { |
|
/* FIXME: if (force), slam module count damn the torpedoes */ |
|
pr_debug("%s already dying\n", mod->name); |
|
ret = -EBUSY; |
|
goto out; |
|
} |
|
|
|
/* If it has an init func, it must have an exit func to unload */ |
|
if (mod->init && !mod->exit) { |
|
forced = try_force_unload(flags); |
|
if (!forced) { |
|
/* This module can't be removed */ |
|
ret = -EBUSY; |
|
goto out; |
|
} |
|
} |
|
|
|
/* Stop the machine so refcounts can't move and disable module. */ |
|
ret = try_stop_module(mod, flags, &forced); |
|
if (ret != 0) |
|
goto out; |
|
|
|
mutex_unlock(&module_mutex); |
|
/* Final destruction now no one is using it. */ |
|
if (mod->exit != NULL) |
|
mod->exit(); |
|
blocking_notifier_call_chain(&module_notify_list, |
|
MODULE_STATE_GOING, mod); |
|
klp_module_going(mod); |
|
ftrace_release_mod(mod); |
|
|
|
async_synchronize_full(); |
|
|
|
/* Store the name of the last unloaded module for diagnostic purposes */ |
|
strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module)); |
|
|
|
free_module(mod); |
|
/* someone could wait for the module in add_unformed_module() */ |
|
wake_up_all(&module_wq); |
|
return 0; |
|
out: |
|
mutex_unlock(&module_mutex); |
|
return ret; |
|
} |
|
|
|
static inline void print_unload_info(struct seq_file *m, struct module *mod) |
|
{ |
|
struct module_use *use; |
|
int printed_something = 0; |
|
|
|
seq_printf(m, " %i ", module_refcount(mod)); |
|
|
|
/* |
|
* Always include a trailing , so userspace can differentiate |
|
* between this and the old multi-field proc format. |
|
*/ |
|
list_for_each_entry(use, &mod->source_list, source_list) { |
|
printed_something = 1; |
|
seq_printf(m, "%s,", use->source->name); |
|
} |
|
|
|
if (mod->init != NULL && mod->exit == NULL) { |
|
printed_something = 1; |
|
seq_puts(m, "[permanent],"); |
|
} |
|
|
|
if (!printed_something) |
|
seq_puts(m, "-"); |
|
} |
|
|
|
void __symbol_put(const char *symbol) |
|
{ |
|
struct find_symbol_arg fsa = { |
|
.name = symbol, |
|
.gplok = true, |
|
}; |
|
|
|
preempt_disable(); |
|
BUG_ON(!find_symbol(&fsa)); |
|
module_put(fsa.owner); |
|
preempt_enable(); |
|
} |
|
EXPORT_SYMBOL(__symbol_put); |
|
|
|
/* Note this assumes addr is a function, which it currently always is. */ |
|
void symbol_put_addr(void *addr) |
|
{ |
|
struct module *modaddr; |
|
unsigned long a = (unsigned long)dereference_function_descriptor(addr); |
|
|
|
if (core_kernel_text(a)) |
|
return; |
|
|
|
/* |
|
* Even though we hold a reference on the module; we still need to |
|
* disable preemption in order to safely traverse the data structure. |
|
*/ |
|
preempt_disable(); |
|
modaddr = __module_text_address(a); |
|
BUG_ON(!modaddr); |
|
module_put(modaddr); |
|
preempt_enable(); |
|
} |
|
EXPORT_SYMBOL_GPL(symbol_put_addr); |
|
|
|
static ssize_t show_refcnt(struct module_attribute *mattr, |
|
struct module_kobject *mk, char *buffer) |
|
{ |
|
return sprintf(buffer, "%i\n", module_refcount(mk->mod)); |
|
} |
|
|
|
static struct module_attribute modinfo_refcnt = |
|
__ATTR(refcnt, 0444, show_refcnt, NULL); |
|
|
|
void __module_get(struct module *module) |
|
{ |
|
if (module) { |
|
preempt_disable(); |
|
atomic_inc(&module->refcnt); |
|
trace_module_get(module, _RET_IP_); |
|
preempt_enable(); |
|
} |
|
} |
|
EXPORT_SYMBOL(__module_get); |
|
|
|
bool try_module_get(struct module *module) |
|
{ |
|
bool ret = true; |
|
|
|
if (module) { |
|
preempt_disable(); |
|
/* Note: here, we can fail to get a reference */ |
|
if (likely(module_is_live(module) && |
|
atomic_inc_not_zero(&module->refcnt) != 0)) |
|
trace_module_get(module, _RET_IP_); |
|
else |
|
ret = false; |
|
|
|
preempt_enable(); |
|
} |
|
return ret; |
|
} |
|
EXPORT_SYMBOL(try_module_get); |
|
|
|
void module_put(struct module *module) |
|
{ |
|
int ret; |
|
|
|
if (module) { |
|
preempt_disable(); |
|
ret = atomic_dec_if_positive(&module->refcnt); |
|
WARN_ON(ret < 0); /* Failed to put refcount */ |
|
trace_module_put(module, _RET_IP_); |
|
preempt_enable(); |
|
} |
|
} |
|
EXPORT_SYMBOL(module_put); |
|
|
|
#else /* !CONFIG_MODULE_UNLOAD */ |
|
static inline void print_unload_info(struct seq_file *m, struct module *mod) |
|
{ |
|
/* We don't know the usage count, or what modules are using. */ |
|
seq_puts(m, " - -"); |
|
} |
|
|
|
static inline void module_unload_free(struct module *mod) |
|
{ |
|
} |
|
|
|
static int ref_module(struct module *a, struct module *b) |
|
{ |
|
return strong_try_module_get(b); |
|
} |
|
|
|
static inline int module_unload_init(struct module *mod) |
|
{ |
|
return 0; |
|
} |
|
#endif /* CONFIG_MODULE_UNLOAD */ |
|
|
|
static size_t module_flags_taint(struct module *mod, char *buf) |
|
{ |
|
size_t l = 0; |
|
int i; |
|
|
|
for (i = 0; i < TAINT_FLAGS_COUNT; i++) { |
|
if (taint_flags[i].module && test_bit(i, &mod->taints)) |
|
buf[l++] = taint_flags[i].c_true; |
|
} |
|
|
|
return l; |
|
} |
|
|
|
static ssize_t show_initstate(struct module_attribute *mattr, |
|
struct module_kobject *mk, char *buffer) |
|
{ |
|
const char *state = "unknown"; |
|
|
|
switch (mk->mod->state) { |
|
case MODULE_STATE_LIVE: |
|
state = "live"; |
|
break; |
|
case MODULE_STATE_COMING: |
|
state = "coming"; |
|
break; |
|
case MODULE_STATE_GOING: |
|
state = "going"; |
|
break; |
|
default: |
|
BUG(); |
|
} |
|
return sprintf(buffer, "%s\n", state); |
|
} |
|
|
|
static struct module_attribute modinfo_initstate = |
|
__ATTR(initstate, 0444, show_initstate, NULL); |
|
|
|
static ssize_t store_uevent(struct module_attribute *mattr, |
|
struct module_kobject *mk, |
|
const char *buffer, size_t count) |
|
{ |
|
int rc; |
|
|
|
rc = kobject_synth_uevent(&mk->kobj, buffer, count); |
|
return rc ? rc : count; |
|
} |
|
|
|
struct module_attribute module_uevent = |
|
__ATTR(uevent, 0200, NULL, store_uevent); |
|
|
|
static ssize_t show_coresize(struct module_attribute *mattr, |
|
struct module_kobject *mk, char *buffer) |
|
{ |
|
return sprintf(buffer, "%u\n", mk->mod->core_layout.size); |
|
} |
|
|
|
static struct module_attribute modinfo_coresize = |
|
__ATTR(coresize, 0444, show_coresize, NULL); |
|
|
|
static ssize_t show_initsize(struct module_attribute *mattr, |
|
struct module_kobject *mk, char *buffer) |
|
{ |
|
return sprintf(buffer, "%u\n", mk->mod->init_layout.size); |
|
} |
|
|
|
static struct module_attribute modinfo_initsize = |
|
__ATTR(initsize, 0444, show_initsize, NULL); |
|
|
|
static ssize_t show_taint(struct module_attribute *mattr, |
|
struct module_kobject *mk, char *buffer) |
|
{ |
|
size_t l; |
|
|
|
l = module_flags_taint(mk->mod, buffer); |
|
buffer[l++] = '\n'; |
|
return l; |
|
} |
|
|
|
static struct module_attribute modinfo_taint = |
|
__ATTR(taint, 0444, show_taint, NULL); |
|
|
|
static struct module_attribute *modinfo_attrs[] = { |
|
&module_uevent, |
|
&modinfo_version, |
|
&modinfo_srcversion, |
|
&modinfo_initstate, |
|
&modinfo_coresize, |
|
&modinfo_initsize, |
|
&modinfo_taint, |
|
#ifdef CONFIG_MODULE_UNLOAD |
|
&modinfo_refcnt, |
|
#endif |
|
NULL, |
|
}; |
|
|
|
static const char vermagic[] = VERMAGIC_STRING; |
|
|
|
static int try_to_force_load(struct module *mod, const char *reason) |
|
{ |
|
#ifdef CONFIG_MODULE_FORCE_LOAD |
|
if (!test_taint(TAINT_FORCED_MODULE)) |
|
pr_warn("%s: %s: kernel tainted.\n", mod->name, reason); |
|
add_taint_module(mod, TAINT_FORCED_MODULE, LOCKDEP_NOW_UNRELIABLE); |
|
return 0; |
|
#else |
|
return -ENOEXEC; |
|
#endif |
|
} |
|
|
|
#ifdef CONFIG_MODVERSIONS |
|
|
|
static u32 resolve_rel_crc(const s32 *crc) |
|
{ |
|
return *(u32 *)((void *)crc + *crc); |
|
} |
|
|
|
static int check_version(const struct load_info *info, |
|
const char *symname, |
|
struct module *mod, |
|
const s32 *crc) |
|
{ |
|
Elf_Shdr *sechdrs = info->sechdrs; |
|
unsigned int versindex = info->index.vers; |
|
unsigned int i, num_versions; |
|
struct modversion_info *versions; |
|
|
|
/* Exporting module didn't supply crcs? OK, we're already tainted. */ |
|
if (!crc) |
|
return 1; |
|
|
|
/* No versions at all? modprobe --force does this. */ |
|
if (versindex == 0) |
|
return try_to_force_load(mod, symname) == 0; |
|
|
|
versions = (void *) sechdrs[versindex].sh_addr; |
|
num_versions = sechdrs[versindex].sh_size |
|
/ sizeof(struct modversion_info); |
|
|
|
for (i = 0; i < num_versions; i++) { |
|
u32 crcval; |
|
|
|
if (strcmp(versions[i].name, symname) != 0) |
|
continue; |
|
|
|
if (IS_ENABLED(CONFIG_MODULE_REL_CRCS)) |
|
crcval = resolve_rel_crc(crc); |
|
else |
|
crcval = *crc; |
|
if (versions[i].crc == crcval) |
|
return 1; |
|
pr_debug("Found checksum %X vs module %lX\n", |
|
crcval, versions[i].crc); |
|
goto bad_version; |
|
} |
|
|
|
/* Broken toolchain. Warn once, then let it go.. */ |
|
pr_warn_once("%s: no symbol version for %s\n", info->name, symname); |
|
return 1; |
|
|
|
bad_version: |
|
pr_warn("%s: disagrees about version of symbol %s\n", |
|
info->name, symname); |
|
return 0; |
|
} |
|
|
|
static inline int check_modstruct_version(const struct load_info *info, |
|
struct module *mod) |
|
{ |
|
struct find_symbol_arg fsa = { |
|
.name = "module_layout", |
|
.gplok = true, |
|
}; |
|
|
|
/* |
|
* Since this should be found in kernel (which can't be removed), no |
|
* locking is necessary -- use preempt_disable() to placate lockdep. |
|
*/ |
|
preempt_disable(); |
|
if (!find_symbol(&fsa)) { |
|
preempt_enable(); |
|
BUG(); |
|
} |
|
preempt_enable(); |
|
return check_version(info, "module_layout", mod, fsa.crc); |
|
} |
|
|
|
/* First part is kernel version, which we ignore if module has crcs. */ |
|
static inline int same_magic(const char *amagic, const char *bmagic, |
|
bool has_crcs) |
|
{ |
|
if (has_crcs) { |
|
amagic += strcspn(amagic, " "); |
|
bmagic += strcspn(bmagic, " "); |
|
} |
|
return strcmp(amagic, bmagic) == 0; |
|
} |
|
#else |
|
static inline int check_version(const struct load_info *info, |
|
const char *symname, |
|
struct module *mod, |
|
const s32 *crc) |
|
{ |
|
return 1; |
|
} |
|
|
|
static inline int check_modstruct_version(const struct load_info *info, |
|
struct module *mod) |
|
{ |
|
return 1; |
|
} |
|
|
|
static inline int same_magic(const char *amagic, const char *bmagic, |
|
bool has_crcs) |
|
{ |
|
return strcmp(amagic, bmagic) == 0; |
|
} |
|
#endif /* CONFIG_MODVERSIONS */ |
|
|
|
static char *get_modinfo(const struct load_info *info, const char *tag); |
|
static char *get_next_modinfo(const struct load_info *info, const char *tag, |
|
char *prev); |
|
|
|
static int verify_namespace_is_imported(const struct load_info *info, |
|
const struct kernel_symbol *sym, |
|
struct module *mod) |
|
{ |
|
const char *namespace; |
|
char *imported_namespace; |
|
|
|
namespace = kernel_symbol_namespace(sym); |
|
if (namespace && namespace[0]) { |
|
imported_namespace = get_modinfo(info, "import_ns"); |
|
while (imported_namespace) { |
|
if (strcmp(namespace, imported_namespace) == 0) |
|
return 0; |
|
imported_namespace = get_next_modinfo( |
|
info, "import_ns", imported_namespace); |
|
} |
|
#ifdef CONFIG_MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS |
|
pr_warn( |
|
#else |
|
pr_err( |
|
#endif |
|
"%s: module uses symbol (%s) from namespace %s, but does not import it.\n", |
|
mod->name, kernel_symbol_name(sym), namespace); |
|
#ifndef CONFIG_MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS |
|
return -EINVAL; |
|
#endif |
|
} |
|
return 0; |
|
} |
|
|
|
static bool inherit_taint(struct module *mod, struct module *owner) |
|
{ |
|
if (!owner || !test_bit(TAINT_PROPRIETARY_MODULE, &owner->taints)) |
|
return true; |
|
|
|
if (mod->using_gplonly_symbols) { |
|
pr_err("%s: module using GPL-only symbols uses symbols from proprietary module %s.\n", |
|
mod->name, owner->name); |
|
return false; |
|
} |
|
|
|
if (!test_bit(TAINT_PROPRIETARY_MODULE, &mod->taints)) { |
|
pr_warn("%s: module uses symbols from proprietary module %s, inheriting taint.\n", |
|
mod->name, owner->name); |
|
set_bit(TAINT_PROPRIETARY_MODULE, &mod->taints); |
|
} |
|
return true; |
|
} |
|
|
|
/* Resolve a symbol for this module. I.e. if we find one, record usage. */ |
|
static const struct kernel_symbol *resolve_symbol(struct module *mod, |
|
const struct load_info *info, |
|
const char *name, |
|
char ownername[]) |
|
{ |
|
struct find_symbol_arg fsa = { |
|
.name = name, |
|
.gplok = !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), |
|
.warn = true, |
|
}; |
|
int err; |
|
|
|
/* |
|
* The module_mutex should not be a heavily contended lock; |
|
* if we get the occasional sleep here, we'll go an extra iteration |
|
* in the wait_event_interruptible(), which is harmless. |
|
*/ |
|
sched_annotate_sleep(); |
|
mutex_lock(&module_mutex); |
|
if (!find_symbol(&fsa)) |
|
goto unlock; |
|
|
|
if (fsa.license == GPL_ONLY) |
|
mod->using_gplonly_symbols = true; |
|
|
|
if (!inherit_taint(mod, fsa.owner)) { |
|
fsa.sym = NULL; |
|
goto getname; |
|
} |
|
|
|
if (!check_version(info, name, mod, fsa.crc)) { |
|
fsa.sym = ERR_PTR(-EINVAL); |
|
goto getname; |
|
} |
|
|
|
err = verify_namespace_is_imported(info, fsa.sym, mod); |
|
if (err) { |
|
fsa.sym = ERR_PTR(err); |
|
goto getname; |
|
} |
|
|
|
err = ref_module(mod, fsa.owner); |
|
if (err) { |
|
fsa.sym = ERR_PTR(err); |
|
goto getname; |
|
} |
|
|
|
getname: |
|
/* We must make copy under the lock if we failed to get ref. */ |
|
strncpy(ownername, module_name(fsa.owner), MODULE_NAME_LEN); |
|
unlock: |
|
mutex_unlock(&module_mutex); |
|
return fsa.sym; |
|
} |
|
|
|
static const struct kernel_symbol * |
|
resolve_symbol_wait(struct module *mod, |
|
const struct load_info *info, |
|
const char *name) |
|
{ |
|
const struct kernel_symbol *ksym; |
|
char owner[MODULE_NAME_LEN]; |
|
|
|
if (wait_event_interruptible_timeout(module_wq, |
|
!IS_ERR(ksym = resolve_symbol(mod, info, name, owner)) |
|
|| PTR_ERR(ksym) != -EBUSY, |
|
30 * HZ) <= 0) { |
|
pr_warn("%s: gave up waiting for init of module %s.\n", |
|
mod->name, owner); |
|
} |
|
return ksym; |
|
} |
|
|
|
#ifdef CONFIG_KALLSYMS |
|
static inline bool sect_empty(const Elf_Shdr *sect) |
|
{ |
|
return !(sect->sh_flags & SHF_ALLOC) || sect->sh_size == 0; |
|
} |
|
#endif |
|
|
|
/* |
|
* /sys/module/foo/sections stuff |
|
* J. Corbet <[email protected]> |
|
*/ |
|
#ifdef CONFIG_SYSFS |
|
|
|
#ifdef CONFIG_KALLSYMS |
|
struct module_sect_attr { |
|
struct bin_attribute battr; |
|
unsigned long address; |
|
}; |
|
|
|
struct module_sect_attrs { |
|
struct attribute_group grp; |
|
unsigned int nsections; |
|
struct module_sect_attr attrs[]; |
|
}; |
|
|
|
#define MODULE_SECT_READ_SIZE (3 /* "0x", "\n" */ + (BITS_PER_LONG / 4)) |
|
static ssize_t module_sect_read(struct file *file, struct kobject *kobj, |
|
struct bin_attribute *battr, |
|
char *buf, loff_t pos, size_t count) |
|
{ |
|
struct module_sect_attr *sattr = |
|
container_of(battr, struct module_sect_attr, battr); |
|
char bounce[MODULE_SECT_READ_SIZE + 1]; |
|
size_t wrote; |
|
|
|
if (pos != 0) |
|
return -EINVAL; |
|
|
|
/* |
|
* Since we're a binary read handler, we must account for the |
|
* trailing NUL byte that sprintf will write: if "buf" is |
|
* too small to hold the NUL, or the NUL is exactly the last |
|
* byte, the read will look like it got truncated by one byte. |
|
* Since there is no way to ask sprintf nicely to not write |
|
* the NUL, we have to use a bounce buffer. |
|
*/ |
|
wrote = scnprintf(bounce, sizeof(bounce), "0x%px\n", |
|
kallsyms_show_value(file->f_cred) |
|
? (void *)sattr->address : NULL); |
|
count = min(count, wrote); |
|
memcpy(buf, bounce, count); |
|
|
|
return count; |
|
} |
|
|
|
static void free_sect_attrs(struct module_sect_attrs *sect_attrs) |
|
{ |
|
unsigned int section; |
|
|
|
for (section = 0; section < sect_attrs->nsections; section++) |
|
kfree(sect_attrs->attrs[section].battr.attr.name); |
|
kfree(sect_attrs); |
|
} |
|
|
|
static void add_sect_attrs(struct module *mod, const struct load_info *info) |
|
{ |
|
unsigned int nloaded = 0, i, size[2]; |
|
struct module_sect_attrs *sect_attrs; |
|
struct module_sect_attr *sattr; |
|
struct bin_attribute **gattr; |
|
|
|
/* Count loaded sections and allocate structures */ |
|
for (i = 0; i < info->hdr->e_shnum; i++) |
|
if (!sect_empty(&info->sechdrs[i])) |
|
nloaded++; |
|
size[0] = ALIGN(struct_size(sect_attrs, attrs, nloaded), |
|
sizeof(sect_attrs->grp.bin_attrs[0])); |
|
size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.bin_attrs[0]); |
|
sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL); |
|
if (sect_attrs == NULL) |
|
return; |
|
|
|
/* Setup section attributes. */ |
|
sect_attrs->grp.name = "sections"; |
|
sect_attrs->grp.bin_attrs = (void *)sect_attrs + size[0]; |
|
|
|
sect_attrs->nsections = 0; |
|
sattr = §_attrs->attrs[0]; |
|
gattr = §_attrs->grp.bin_attrs[0]; |
|
for (i = 0; i < info->hdr->e_shnum; i++) { |
|
Elf_Shdr *sec = &info->sechdrs[i]; |
|
if (sect_empty(sec)) |
|
continue; |
|
sysfs_bin_attr_init(&sattr->battr); |
|
sattr->address = sec->sh_addr; |
|
sattr->battr.attr.name = |
|
kstrdup(info->secstrings + sec->sh_name, GFP_KERNEL); |
|
if (sattr->battr.attr.name == NULL) |
|
goto out; |
|
sect_attrs->nsections++; |
|
sattr->battr.read = module_sect_read; |
|
sattr->battr.size = MODULE_SECT_READ_SIZE; |
|
sattr->battr.attr.mode = 0400; |
|
*(gattr++) = &(sattr++)->battr; |
|
} |
|
*gattr = NULL; |
|
|
|
if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp)) |
|
goto out; |
|
|
|
mod->sect_attrs = sect_attrs; |
|
return; |
|
out: |
|
free_sect_attrs(sect_attrs); |
|
} |
|
|
|
static void remove_sect_attrs(struct module *mod) |
|
{ |
|
if (mod->sect_attrs) { |
|
sysfs_remove_group(&mod->mkobj.kobj, |
|
&mod->sect_attrs->grp); |
|
/* |
|
* We are positive that no one is using any sect attrs |
|
* at this point. Deallocate immediately. |
|
*/ |
|
free_sect_attrs(mod->sect_attrs); |
|
mod->sect_attrs = NULL; |
|
} |
|
} |
|
|
|
/* |
|
* /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections. |
|
*/ |
|
|
|
struct module_notes_attrs { |
|
struct kobject *dir; |
|
unsigned int notes; |
|
struct bin_attribute attrs[]; |
|
}; |
|
|
|
static ssize_t module_notes_read(struct file *filp, struct kobject *kobj, |
|
struct bin_attribute *bin_attr, |
|
char *buf, loff_t pos, size_t count) |
|
{ |
|
/* |
|
* The caller checked the pos and count against our size. |
|
*/ |
|
memcpy(buf, bin_attr->private + pos, count); |
|
return count; |
|
} |
|
|
|
static void free_notes_attrs(struct module_notes_attrs *notes_attrs, |
|
unsigned int i) |
|
{ |
|
if (notes_attrs->dir) { |
|
while (i-- > 0) |
|
sysfs_remove_bin_file(notes_attrs->dir, |
|
¬es_attrs->attrs[i]); |
|
kobject_put(notes_attrs->dir); |
|
} |
|
kfree(notes_attrs); |
|
} |
|
|
|
static void add_notes_attrs(struct module *mod, const struct load_info *info) |
|
{ |
|
unsigned int notes, loaded, i; |
|
struct module_notes_attrs *notes_attrs; |
|
struct bin_attribute *nattr; |
|
|
|
/* failed to create section attributes, so can't create notes */ |
|
if (!mod->sect_attrs) |
|
return; |
|
|
|
/* Count notes sections and allocate structures. */ |
|
notes = 0; |
|
for (i = 0; i < info->hdr->e_shnum; i++) |
|
if (!sect_empty(&info->sechdrs[i]) && |
|
(info->sechdrs[i].sh_type == SHT_NOTE)) |
|
++notes; |
|
|
|
if (notes == 0) |
|
return; |
|
|
|
notes_attrs = kzalloc(struct_size(notes_attrs, attrs, notes), |
|
GFP_KERNEL); |
|
if (notes_attrs == NULL) |
|
return; |
|
|
|
notes_attrs->notes = notes; |
|
nattr = ¬es_attrs->attrs[0]; |
|
for (loaded = i = 0; i < info->hdr->e_shnum; ++i) { |
|
if (sect_empty(&info->sechdrs[i])) |
|
continue; |
|
if (info->sechdrs[i].sh_type == SHT_NOTE) { |
|
sysfs_bin_attr_init(nattr); |
|
nattr->attr.name = mod->sect_attrs->attrs[loaded].battr.attr.name; |
|
nattr->attr.mode = S_IRUGO; |
|
nattr->size = info->sechdrs[i].sh_size; |
|
nattr->private = (void *) info->sechdrs[i].sh_addr; |
|
nattr->read = module_notes_read; |
|
++nattr; |
|
} |
|
++loaded; |
|
} |
|
|
|
notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj); |
|
if (!notes_attrs->dir) |
|
goto out; |
|
|
|
for (i = 0; i < notes; ++i) |
|
if (sysfs_create_bin_file(notes_attrs->dir, |
|
¬es_attrs->attrs[i])) |
|
goto out; |
|
|
|
mod->notes_attrs = notes_attrs; |
|
return; |
|
|
|
out: |
|
free_notes_attrs(notes_attrs, i); |
|
} |
|
|
|
static void remove_notes_attrs(struct module *mod) |
|
{ |
|
if (mod->notes_attrs) |
|
free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes); |
|
} |
|
|
|
#else |
|
|
|
static inline void add_sect_attrs(struct module *mod, |
|
const struct load_info *info) |
|
{ |
|
} |
|
|
|
static inline void remove_sect_attrs(struct module *mod) |
|
{ |
|
} |
|
|
|
static inline void add_notes_attrs(struct module *mod, |
|
const struct load_info *info) |
|
{ |
|
} |
|
|
|
static inline void remove_notes_attrs(struct module *mod) |
|
{ |
|
} |
|
#endif /* CONFIG_KALLSYMS */ |
|
|
|
static void del_usage_links(struct module *mod) |
|
{ |
|
#ifdef CONFIG_MODULE_UNLOAD |
|
struct module_use *use; |
|
|
|
mutex_lock(&module_mutex); |
|
list_for_each_entry(use, &mod->target_list, target_list) |
|
sysfs_remove_link(use->target->holders_dir, mod->name); |
|
mutex_unlock(&module_mutex); |
|
#endif |
|
} |
|
|
|
static int add_usage_links(struct module *mod) |
|
{ |
|
int ret = 0; |
|
#ifdef CONFIG_MODULE_UNLOAD |
|
struct module_use *use; |
|
|
|
mutex_lock(&module_mutex); |
|
list_for_each_entry(use, &mod->target_list, target_list) { |
|
ret = sysfs_create_link(use->target->holders_dir, |
|
&mod->mkobj.kobj, mod->name); |
|
if (ret) |
|
break; |
|
} |
|
mutex_unlock(&module_mutex); |
|
if (ret) |
|
del_usage_links(mod); |
|
#endif |
|
return ret; |
|
} |
|
|
|
static void module_remove_modinfo_attrs(struct module *mod, int end); |
|
|
|
static int module_add_modinfo_attrs(struct module *mod) |
|
{ |
|
struct module_attribute *attr; |
|
struct module_attribute *temp_attr; |
|
int error = 0; |
|
int i; |
|
|
|
mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) * |
|
(ARRAY_SIZE(modinfo_attrs) + 1)), |
|
GFP_KERNEL); |
|
if (!mod->modinfo_attrs) |
|
return -ENOMEM; |
|
|
|
temp_attr = mod->modinfo_attrs; |
|
for (i = 0; (attr = modinfo_attrs[i]); i++) { |
|
if (!attr->test || attr->test(mod)) { |
|
memcpy(temp_attr, attr, sizeof(*temp_attr)); |
|
sysfs_attr_init(&temp_attr->attr); |
|
error = sysfs_create_file(&mod->mkobj.kobj, |
|
&temp_attr->attr); |
|
if (error) |
|
goto error_out; |
|
++temp_attr; |
|
} |
|
} |
|
|
|
return 0; |
|
|
|
error_out: |
|
if (i > 0) |
|
module_remove_modinfo_attrs(mod, --i); |
|
else |
|
kfree(mod->modinfo_attrs); |
|
return error; |
|
} |
|
|
|
static void module_remove_modinfo_attrs(struct module *mod, int end) |
|
{ |
|
struct module_attribute *attr; |
|
int i; |
|
|
|
for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) { |
|
if (end >= 0 && i > end) |
|
break; |
|
/* pick a field to test for end of list */ |
|
if (!attr->attr.name) |
|
break; |
|
sysfs_remove_file(&mod->mkobj.kobj, &attr->attr); |
|
if (attr->free) |
|
attr->free(mod); |
|
} |
|
kfree(mod->modinfo_attrs); |
|
} |
|
|
|
static void mod_kobject_put(struct module *mod) |
|
{ |
|
DECLARE_COMPLETION_ONSTACK(c); |
|
mod->mkobj.kobj_completion = &c; |
|
kobject_put(&mod->mkobj.kobj); |
|
wait_for_completion(&c); |
|
} |
|
|
|
static int mod_sysfs_init(struct module *mod) |
|
{ |
|
int err; |
|
struct kobject *kobj; |
|
|
|
if (!module_sysfs_initialized) { |
|
pr_err("%s: module sysfs not initialized\n", mod->name); |
|
err = -EINVAL; |
|
goto out; |
|
} |
|
|
|
kobj = kset_find_obj(module_kset, mod->name); |
|
if (kobj) { |
|
pr_err("%s: module is already loaded\n", mod->name); |
|
kobject_put(kobj); |
|
err = -EINVAL; |
|
goto out; |
|
} |
|
|
|
mod->mkobj.mod = mod; |
|
|
|
memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj)); |
|
mod->mkobj.kobj.kset = module_kset; |
|
err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL, |
|
"%s", mod->name); |
|
if (err) |
|
mod_kobject_put(mod); |
|
|
|
out: |
|
return err; |
|
} |
|
|
|
static int mod_sysfs_setup(struct module *mod, |
|
const struct load_info *info, |
|
struct kernel_param *kparam, |
|
unsigned int num_params) |
|
{ |
|
int err; |
|
|
|
err = mod_sysfs_init(mod); |
|
if (err) |
|
goto out; |
|
|
|
mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj); |
|
if (!mod->holders_dir) { |
|
err = -ENOMEM; |
|
goto out_unreg; |
|
} |
|
|
|
err = module_param_sysfs_setup(mod, kparam, num_params); |
|
if (err) |
|
goto out_unreg_holders; |
|
|
|
err = module_add_modinfo_attrs(mod); |
|
if (err) |
|
goto out_unreg_param; |
|
|
|
err = add_usage_links(mod); |
|
if (err) |
|
goto out_unreg_modinfo_attrs; |
|
|
|
add_sect_attrs(mod, info); |
|
add_notes_attrs(mod, info); |
|
|
|
return 0; |
|
|
|
out_unreg_modinfo_attrs: |
|
module_remove_modinfo_attrs(mod, -1); |
|
out_unreg_param: |
|
module_param_sysfs_remove(mod); |
|
out_unreg_holders: |
|
kobject_put(mod->holders_dir); |
|
out_unreg: |
|
mod_kobject_put(mod); |
|
out: |
|
return err; |
|
} |
|
|
|
static void mod_sysfs_fini(struct module *mod) |
|
{ |
|
remove_notes_attrs(mod); |
|
remove_sect_attrs(mod); |
|
mod_kobject_put(mod); |
|
} |
|
|
|
static void init_param_lock(struct module *mod) |
|
{ |
|
mutex_init(&mod->param_lock); |
|
} |
|
#else /* !CONFIG_SYSFS */ |
|
|
|
static int mod_sysfs_setup(struct module *mod, |
|
const struct load_info *info, |
|
struct kernel_param *kparam, |
|
unsigned int num_params) |
|
{ |
|
return 0; |
|
} |
|
|
|
static void mod_sysfs_fini(struct module *mod) |
|
{ |
|
} |
|
|
|
static void module_remove_modinfo_attrs(struct module *mod, int end) |
|
{ |
|
} |
|
|
|
static void del_usage_links(struct module *mod) |
|
{ |
|
} |
|
|
|
static void init_param_lock(struct module *mod) |
|
{ |
|
} |
|
#endif /* CONFIG_SYSFS */ |
|
|
|
static void mod_sysfs_teardown(struct module *mod) |
|
{ |
|
del_usage_links(mod); |
|
module_remove_modinfo_attrs(mod, -1); |
|
module_param_sysfs_remove(mod); |
|
kobject_put(mod->mkobj.drivers_dir); |
|
kobject_put(mod->holders_dir); |
|
mod_sysfs_fini(mod); |
|
} |
|
|
|
/* |
|
* LKM RO/NX protection: protect module's text/ro-data |
|
* from modification and any data from execution. |
|
* |
|
* General layout of module is: |
|
* [text] [read-only-data] [ro-after-init] [writable data] |
|
* text_size -----^ ^ ^ ^ |
|
* ro_size ------------------------| | | |
|
* ro_after_init_size -----------------------------| | |
|
* size -----------------------------------------------------------| |
|
* |
|
* These values are always page-aligned (as is base) |
|
*/ |
|
|
|
/* |
|
* Since some arches are moving towards PAGE_KERNEL module allocations instead |
|
* of PAGE_KERNEL_EXEC, keep frob_text() and module_enable_x() outside of the |
|
* CONFIG_STRICT_MODULE_RWX block below because they are needed regardless of |
|
* whether we are strict. |
|
*/ |
|
#ifdef CONFIG_ARCH_HAS_STRICT_MODULE_RWX |
|
static void frob_text(const struct module_layout *layout, |
|
int (*set_memory)(unsigned long start, int num_pages)) |
|
{ |
|
BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); |
|
BUG_ON((unsigned long)layout->text_size & (PAGE_SIZE-1)); |
|
set_memory((unsigned long)layout->base, |
|
layout->text_size >> PAGE_SHIFT); |
|
} |
|
|
|
static void module_enable_x(const struct module *mod) |
|
{ |
|
frob_text(&mod->core_layout, set_memory_x); |
|
frob_text(&mod->init_layout, set_memory_x); |
|
} |
|
#else /* !CONFIG_ARCH_HAS_STRICT_MODULE_RWX */ |
|
static void module_enable_x(const struct module *mod) { } |
|
#endif /* CONFIG_ARCH_HAS_STRICT_MODULE_RWX */ |
|
|
|
#ifdef CONFIG_STRICT_MODULE_RWX |
|
static void frob_rodata(const struct module_layout *layout, |
|
int (*set_memory)(unsigned long start, int num_pages)) |
|
{ |
|
BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); |
|
BUG_ON((unsigned long)layout->text_size & (PAGE_SIZE-1)); |
|
BUG_ON((unsigned long)layout->ro_size & (PAGE_SIZE-1)); |
|
set_memory((unsigned long)layout->base + layout->text_size, |
|
(layout->ro_size - layout->text_size) >> PAGE_SHIFT); |
|
} |
|
|
|
static void frob_ro_after_init(const struct module_layout *layout, |
|
int (*set_memory)(unsigned long start, int num_pages)) |
|
{ |
|
BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); |
|
BUG_ON((unsigned long)layout->ro_size & (PAGE_SIZE-1)); |
|
BUG_ON((unsigned long)layout->ro_after_init_size & (PAGE_SIZE-1)); |
|
set_memory((unsigned long)layout->base + layout->ro_size, |
|
(layout->ro_after_init_size - layout->ro_size) >> PAGE_SHIFT); |
|
} |
|
|
|
static void frob_writable_data(const struct module_layout *layout, |
|
int (*set_memory)(unsigned long start, int num_pages)) |
|
{ |
|
BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); |
|
BUG_ON((unsigned long)layout->ro_after_init_size & (PAGE_SIZE-1)); |
|
BUG_ON((unsigned long)layout->size & (PAGE_SIZE-1)); |
|
set_memory((unsigned long)layout->base + layout->ro_after_init_size, |
|
(layout->size - layout->ro_after_init_size) >> PAGE_SHIFT); |
|
} |
|
|
|
static void module_enable_ro(const struct module *mod, bool after_init) |
|
{ |
|
if (!rodata_enabled) |
|
return; |
|
|
|
set_vm_flush_reset_perms(mod->core_layout.base); |
|
set_vm_flush_reset_perms(mod->init_layout.base); |
|
frob_text(&mod->core_layout, set_memory_ro); |
|
|
|
frob_rodata(&mod->core_layout, set_memory_ro); |
|
frob_text(&mod->init_layout, set_memory_ro); |
|
frob_rodata(&mod->init_layout, set_memory_ro); |
|
|
|
if (after_init) |
|
frob_ro_after_init(&mod->core_layout, set_memory_ro); |
|
} |
|
|
|
static void module_enable_nx(const struct module *mod) |
|
{ |
|
frob_rodata(&mod->core_layout, set_memory_nx); |
|
frob_ro_after_init(&mod->core_layout, set_memory_nx); |
|
frob_writable_data(&mod->core_layout, set_memory_nx); |
|
frob_rodata(&mod->init_layout, set_memory_nx); |
|
frob_writable_data(&mod->init_layout, set_memory_nx); |
|
} |
|
|
|
static int module_enforce_rwx_sections(Elf_Ehdr *hdr, Elf_Shdr *sechdrs, |
|
char *secstrings, struct module *mod) |
|
{ |
|
const unsigned long shf_wx = SHF_WRITE|SHF_EXECINSTR; |
|
int i; |
|
|
|
for (i = 0; i < hdr->e_shnum; i++) { |
|
if ((sechdrs[i].sh_flags & shf_wx) == shf_wx) { |
|
pr_err("%s: section %s (index %d) has invalid WRITE|EXEC flags\n", |
|
mod->name, secstrings + sechdrs[i].sh_name, i); |
|
return -ENOEXEC; |
|
} |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
#else /* !CONFIG_STRICT_MODULE_RWX */ |
|
static void module_enable_nx(const struct module *mod) { } |
|
static void module_enable_ro(const struct module *mod, bool after_init) {} |
|
static int module_enforce_rwx_sections(Elf_Ehdr *hdr, Elf_Shdr *sechdrs, |
|
char *secstrings, struct module *mod) |
|
{ |
|
return 0; |
|
} |
|
#endif /* CONFIG_STRICT_MODULE_RWX */ |
|
|
|
#ifdef CONFIG_LIVEPATCH |
|
/* |
|
* Persist Elf information about a module. Copy the Elf header, |
|
* section header table, section string table, and symtab section |
|
* index from info to mod->klp_info. |
|
*/ |
|
static int copy_module_elf(struct module *mod, struct load_info *info) |
|
{ |
|
unsigned int size, symndx; |
|
int ret; |
|
|
|
size = sizeof(*mod->klp_info); |
|
mod->klp_info = kmalloc(size, GFP_KERNEL); |
|
if (mod->klp_info == NULL) |
|
return -ENOMEM; |
|
|
|
/* Elf header */ |
|
size = sizeof(mod->klp_info->hdr); |
|
memcpy(&mod->klp_info->hdr, info->hdr, size); |
|
|
|
/* Elf section header table */ |
|
size = sizeof(*info->sechdrs) * info->hdr->e_shnum; |
|
mod->klp_info->sechdrs = kmemdup(info->sechdrs, size, GFP_KERNEL); |
|
if (mod->klp_info->sechdrs == NULL) { |
|
ret = -ENOMEM; |
|
goto free_info; |
|
} |
|
|
|
/* Elf section name string table */ |
|
size = info->sechdrs[info->hdr->e_shstrndx].sh_size; |
|
mod->klp_info->secstrings = kmemdup(info->secstrings, size, GFP_KERNEL); |
|
if (mod->klp_info->secstrings == NULL) { |
|
ret = -ENOMEM; |
|
goto free_sechdrs; |
|
} |
|
|
|
/* Elf symbol section index */ |
|
symndx = info->index.sym; |
|
mod->klp_info->symndx = symndx; |
|
|
|
/* |
|
* For livepatch modules, core_kallsyms.symtab is a complete |
|
* copy of the original symbol table. Adjust sh_addr to point |
|
* to core_kallsyms.symtab since the copy of the symtab in module |
|
* init memory is freed at the end of do_init_module(). |
|
*/ |
|
mod->klp_info->sechdrs[symndx].sh_addr = \ |
|
(unsigned long) mod->core_kallsyms.symtab; |
|
|
|
return 0; |
|
|
|
free_sechdrs: |
|
kfree(mod->klp_info->sechdrs); |
|
free_info: |
|
kfree(mod->klp_info); |
|
return ret; |
|
} |
|
|
|
static void free_module_elf(struct module *mod) |
|
{ |
|
kfree(mod->klp_info->sechdrs); |
|
kfree(mod->klp_info->secstrings); |
|
kfree(mod->klp_info); |
|
} |
|
#else /* !CONFIG_LIVEPATCH */ |
|
static int copy_module_elf(struct module *mod, struct load_info *info) |
|
{ |
|
return 0; |
|
} |
|
|
|
static void free_module_elf(struct module *mod) |
|
{ |
|
} |
|
#endif /* CONFIG_LIVEPATCH */ |
|
|
|
void __weak module_memfree(void *module_region) |
|
{ |
|
/* |
|
* This memory may be RO, and freeing RO memory in an interrupt is not |
|
* supported by vmalloc. |
|
*/ |
|
WARN_ON(in_interrupt()); |
|
vfree(module_region); |
|
} |
|
|
|
void __weak module_arch_cleanup(struct module *mod) |
|
{ |
|
} |
|
|
|
void __weak module_arch_freeing_init(struct module *mod) |
|
{ |
|
} |
|
|
|
static void cfi_cleanup(struct module *mod); |
|
|
|
/* Free a module, remove from lists, etc. */ |
|
static void free_module(struct module *mod) |
|
{ |
|
trace_module_free(mod); |
|
|
|
mod_sysfs_teardown(mod); |
|
|
|
/* |
|
* We leave it in list to prevent duplicate loads, but make sure |
|
* that noone uses it while it's being deconstructed. |
|
*/ |
|
mutex_lock(&module_mutex); |
|
mod->state = MODULE_STATE_UNFORMED; |
|
mutex_unlock(&module_mutex); |
|
|
|
/* Remove dynamic debug info */ |
|
ddebug_remove_module(mod->name); |
|
|
|
/* Arch-specific cleanup. */ |
|
module_arch_cleanup(mod); |
|
|
|
/* Module unload stuff */ |
|
module_unload_free(mod); |
|
|
|
/* Free any allocated parameters. */ |
|
destroy_params(mod->kp, mod->num_kp); |
|
|
|
if (is_livepatch_module(mod)) |
|
free_module_elf(mod); |
|
|
|
/* Now we can delete it from the lists */ |
|
mutex_lock(&module_mutex); |
|
/* Unlink carefully: kallsyms could be walking list. */ |
|
list_del_rcu(&mod->list); |
|
mod_tree_remove(mod); |
|
/* Remove this module from bug list, this uses list_del_rcu */ |
|
module_bug_cleanup(mod); |
|
/* Wait for RCU-sched synchronizing before releasing mod->list and buglist. */ |
|
synchronize_rcu(); |
|
mutex_unlock(&module_mutex); |
|
|
|
/* Clean up CFI for the module. */ |
|
cfi_cleanup(mod); |
|
|
|
/* This may be empty, but that's OK */ |
|
module_arch_freeing_init(mod); |
|
module_memfree(mod->init_layout.base); |
|
kfree(mod->args); |
|
percpu_modfree(mod); |
|
|
|
/* Free lock-classes; relies on the preceding sync_rcu(). */ |
|
lockdep_free_key_range(mod->core_layout.base, mod->core_layout.size); |
|
|
|
/* Finally, free the core (containing the module structure) */ |
|
module_memfree(mod->core_layout.base); |
|
} |
|
|
|
void *__symbol_get(const char *symbol) |
|
{ |
|
struct find_symbol_arg fsa = { |
|
.name = symbol, |
|
.gplok = true, |
|
.warn = true, |
|
}; |
|
|
|
preempt_disable(); |
|
if (!find_symbol(&fsa) || strong_try_module_get(fsa.owner)) { |
|
preempt_enable(); |
|
return NULL; |
|
} |
|
preempt_enable(); |
|
return (void *)kernel_symbol_value(fsa.sym); |
|
} |
|
EXPORT_SYMBOL_GPL(__symbol_get); |
|
|
|
/* |
|
* Ensure that an exported symbol [global namespace] does not already exist |
|
* in the kernel or in some other module's exported symbol table. |
|
* |
|
* You must hold the module_mutex. |
|
*/ |
|
static int verify_exported_symbols(struct module *mod) |
|
{ |
|
unsigned int i; |
|
const struct kernel_symbol *s; |
|
struct { |
|
const struct kernel_symbol *sym; |
|
unsigned int num; |
|
} arr[] = { |
|
{ mod->syms, mod->num_syms }, |
|
{ mod->gpl_syms, mod->num_gpl_syms }, |
|
}; |
|
|
|
for (i = 0; i < ARRAY_SIZE(arr); i++) { |
|
for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) { |
|
struct find_symbol_arg fsa = { |
|
.name = kernel_symbol_name(s), |
|
.gplok = true, |
|
}; |
|
if (find_symbol(&fsa)) { |
|
pr_err("%s: exports duplicate symbol %s" |
|
" (owned by %s)\n", |
|
mod->name, kernel_symbol_name(s), |
|
module_name(fsa.owner)); |
|
return -ENOEXEC; |
|
} |
|
} |
|
} |
|
return 0; |
|
} |
|
|
|
static bool ignore_undef_symbol(Elf_Half emachine, const char *name) |
|
{ |
|
/* |
|
* On x86, PIC code and Clang non-PIC code may have call foo@PLT. GNU as |
|
* before 2.37 produces an unreferenced _GLOBAL_OFFSET_TABLE_ on x86-64. |
|
* i386 has a similar problem but may not deserve a fix. |
|
* |
|
* If we ever have to ignore many symbols, consider refactoring the code to |
|
* only warn if referenced by a relocation. |
|
*/ |
|
if (emachine == EM_386 || emachine == EM_X86_64) |
|
return !strcmp(name, "_GLOBAL_OFFSET_TABLE_"); |
|
return false; |
|
} |
|
|
|
/* Change all symbols so that st_value encodes the pointer directly. */ |
|
static int simplify_symbols(struct module *mod, const struct load_info *info) |
|
{ |
|
Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; |
|
Elf_Sym *sym = (void *)symsec->sh_addr; |
|
unsigned long secbase; |
|
unsigned int i; |
|
int ret = 0; |
|
const struct kernel_symbol *ksym; |
|
|
|
for (i = 1; i < symsec->sh_size / sizeof(Elf_Sym); i++) { |
|
const char *name = info->strtab + sym[i].st_name; |
|
|
|
switch (sym[i].st_shndx) { |
|
case SHN_COMMON: |
|
/* Ignore common symbols */ |
|
if (!strncmp(name, "__gnu_lto", 9)) |
|
break; |
|
|
|
/* |
|
* We compiled with -fno-common. These are not |
|
* supposed to happen. |
|
*/ |
|
pr_debug("Common symbol: %s\n", name); |
|
pr_warn("%s: please compile with -fno-common\n", |
|
mod->name); |
|
ret = -ENOEXEC; |
|
break; |
|
|
|
case SHN_ABS: |
|
/* Don't need to do anything */ |
|
pr_debug("Absolute symbol: 0x%08lx\n", |
|
(long)sym[i].st_value); |
|
break; |
|
|
|
case SHN_LIVEPATCH: |
|
/* Livepatch symbols are resolved by livepatch */ |
|
break; |
|
|
|
case SHN_UNDEF: |
|
ksym = resolve_symbol_wait(mod, info, name); |
|
/* Ok if resolved. */ |
|
if (ksym && !IS_ERR(ksym)) { |
|
sym[i].st_value = kernel_symbol_value(ksym); |
|
break; |
|
} |
|
|
|
/* Ok if weak or ignored. */ |
|
if (!ksym && |
|
(ELF_ST_BIND(sym[i].st_info) == STB_WEAK || |
|
ignore_undef_symbol(info->hdr->e_machine, name))) |
|
break; |
|
|
|
ret = PTR_ERR(ksym) ?: -ENOENT; |
|
pr_warn("%s: Unknown symbol %s (err %d)\n", |
|
mod->name, name, ret); |
|
break; |
|
|
|
default: |
|
/* Divert to percpu allocation if a percpu var. */ |
|
if (sym[i].st_shndx == info->index.pcpu) |
|
secbase = (unsigned long)mod_percpu(mod); |
|
else |
|
secbase = info->sechdrs[sym[i].st_shndx].sh_addr; |
|
sym[i].st_value += secbase; |
|
break; |
|
} |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
static int apply_relocations(struct module *mod, const struct load_info *info) |
|
{ |
|
unsigned int i; |
|
int err = 0; |
|
|
|
/* Now do relocations. */ |
|
for (i = 1; i < info->hdr->e_shnum; i++) { |
|
unsigned int infosec = info->sechdrs[i].sh_info; |
|
|
|
/* Not a valid relocation section? */ |
|
if (infosec >= info->hdr->e_shnum) |
|
continue; |
|
|
|
/* Don't bother with non-allocated sections */ |
|
if (!(info->sechdrs[infosec].sh_flags & SHF_ALLOC)) |
|
continue; |
|
|
|
if (info->sechdrs[i].sh_flags & SHF_RELA_LIVEPATCH) |
|
err = klp_apply_section_relocs(mod, info->sechdrs, |
|
info->secstrings, |
|
info->strtab, |
|
info->index.sym, i, |
|
NULL); |
|
else if (info->sechdrs[i].sh_type == SHT_REL) |
|
err = apply_relocate(info->sechdrs, info->strtab, |
|
info->index.sym, i, mod); |
|
else if (info->sechdrs[i].sh_type == SHT_RELA) |
|
err = apply_relocate_add(info->sechdrs, info->strtab, |
|
info->index.sym, i, mod); |
|
if (err < 0) |
|
break; |
|
} |
|
return err; |
|
} |
|
|
|
/* Additional bytes needed by arch in front of individual sections */ |
|
unsigned int __weak arch_mod_section_prepend(struct module *mod, |
|
unsigned int section) |
|
{ |
|
/* default implementation just returns zero */ |
|
return 0; |
|
} |
|
|
|
/* Update size with this section: return offset. */ |
|
static long get_offset(struct module *mod, unsigned int *size, |
|
Elf_Shdr *sechdr, unsigned int section) |
|
{ |
|
long ret; |
|
|
|
*size += arch_mod_section_prepend(mod, section); |
|
ret = ALIGN(*size, sechdr->sh_addralign ?: 1); |
|
*size = ret + sechdr->sh_size; |
|
return ret; |
|
} |
|
|
|
static bool module_init_layout_section(const char *sname) |
|
{ |
|
#ifndef CONFIG_MODULE_UNLOAD |
|
if (module_exit_section(sname)) |
|
return true; |
|
#endif |
|
return module_init_section(sname); |
|
} |
|
|
|
/* |
|
* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld |
|
* might -- code, read-only data, read-write data, small data. Tally |
|
* sizes, and place the offsets into sh_entsize fields: high bit means it |
|
* belongs in init. |
|
*/ |
|
static void layout_sections(struct module *mod, struct load_info *info) |
|
{ |
|
static unsigned long const masks[][2] = { |
|
/* |
|
* NOTE: all executable code must be the first section |
|
* in this array; otherwise modify the text_size |
|
* finder in the two loops below |
|
*/ |
|
{ SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL }, |
|
{ SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL }, |
|
{ SHF_RO_AFTER_INIT | SHF_ALLOC, ARCH_SHF_SMALL }, |
|
{ SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL }, |
|
{ ARCH_SHF_SMALL | SHF_ALLOC, 0 } |
|
}; |
|
unsigned int m, i; |
|
|
|
for (i = 0; i < info->hdr->e_shnum; i++) |
|
info->sechdrs[i].sh_entsize = ~0UL; |
|
|
|
pr_debug("Core section allocation order:\n"); |
|
for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
|
for (i = 0; i < info->hdr->e_shnum; ++i) { |
|
Elf_Shdr *s = &info->sechdrs[i]; |
|
const char *sname = info->secstrings + s->sh_name; |
|
|
|
if ((s->sh_flags & masks[m][0]) != masks[m][0] |
|
|| (s->sh_flags & masks[m][1]) |
|
|| s->sh_entsize != ~0UL |
|
|| module_init_layout_section(sname)) |
|
continue; |
|
s->sh_entsize = get_offset(mod, &mod->core_layout.size, s, i); |
|
pr_debug("\t%s\n", sname); |
|
} |
|
switch (m) { |
|
case 0: /* executable */ |
|
mod->core_layout.size = debug_align(mod->core_layout.size); |
|
mod->core_layout.text_size = mod->core_layout.size; |
|
break; |
|
case 1: /* RO: text and ro-data */ |
|
mod->core_layout.size = debug_align(mod->core_layout.size); |
|
mod->core_layout.ro_size = mod->core_layout.size; |
|
break; |
|
case 2: /* RO after init */ |
|
mod->core_layout.size = debug_align(mod->core_layout.size); |
|
mod->core_layout.ro_after_init_size = mod->core_layout.size; |
|
break; |
|
case 4: /* whole core */ |
|
mod->core_layout.size = debug_align(mod->core_layout.size); |
|
break; |
|
} |
|
} |
|
|
|
pr_debug("Init section allocation order:\n"); |
|
for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
|
for (i = 0; i < info->hdr->e_shnum; ++i) { |
|
Elf_Shdr *s = &info->sechdrs[i]; |
|
const char *sname = info->secstrings + s->sh_name; |
|
|
|
if ((s->sh_flags & masks[m][0]) != masks[m][0] |
|
|| (s->sh_flags & masks[m][1]) |
|
|| s->sh_entsize != ~0UL |
|
|| !module_init_layout_section(sname)) |
|
continue; |
|
s->sh_entsize = (get_offset(mod, &mod->init_layout.size, s, i) |
|
| INIT_OFFSET_MASK); |
|
pr_debug("\t%s\n", sname); |
|
} |
|
switch (m) { |
|
case 0: /* executable */ |
|
mod->init_layout.size = debug_align(mod->init_layout.size); |
|
mod->init_layout.text_size = mod->init_layout.size; |
|
break; |
|
case 1: /* RO: text and ro-data */ |
|
mod->init_layout.size = debug_align(mod->init_layout.size); |
|
mod->init_layout.ro_size = mod->init_layout.size; |
|
break; |
|
case 2: |
|
/* |
|
* RO after init doesn't apply to init_layout (only |
|
* core_layout), so it just takes the value of ro_size. |
|
*/ |
|
mod->init_layout.ro_after_init_size = mod->init_layout.ro_size; |
|
break; |
|
case 4: /* whole init */ |
|
mod->init_layout.size = debug_align(mod->init_layout.size); |
|
break; |
|
} |
|
} |
|
} |
|
|
|
static void set_license(struct module *mod, const char *license) |
|
{ |
|
if (!license) |
|
license = "unspecified"; |
|
|
|
if (!license_is_gpl_compatible(license)) { |
|
if (!test_taint(TAINT_PROPRIETARY_MODULE)) |
|
pr_warn("%s: module license '%s' taints kernel.\n", |
|
mod->name, license); |
|
add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
|
LOCKDEP_NOW_UNRELIABLE); |
|
} |
|
} |
|
|
|
/* Parse tag=value strings from .modinfo section */ |
|
static char *next_string(char *string, unsigned long *secsize) |
|
{ |
|
/* Skip non-zero chars */ |
|
while (string[0]) { |
|
string++; |
|
if ((*secsize)-- <= 1) |
|
return NULL; |
|
} |
|
|
|
/* Skip any zero padding. */ |
|
while (!string[0]) { |
|
string++; |
|
if ((*secsize)-- <= 1) |
|
return NULL; |
|
} |
|
return string; |
|
} |
|
|
|
static char *get_next_modinfo(const struct load_info *info, const char *tag, |
|
char *prev) |
|
{ |
|
char *p; |
|
unsigned int taglen = strlen(tag); |
|
Elf_Shdr *infosec = &info->sechdrs[info->index.info]; |
|
unsigned long size = infosec->sh_size; |
|
|
|
/* |
|
* get_modinfo() calls made before rewrite_section_headers() |
|
* must use sh_offset, as sh_addr isn't set! |
|
*/ |
|
char *modinfo = (char *)info->hdr + infosec->sh_offset; |
|
|
|
if (prev) { |
|
size -= prev - modinfo; |
|
modinfo = next_string(prev, &size); |
|
} |
|
|
|
for (p = modinfo; p; p = next_string(p, &size)) { |
|
if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') |
|
return p + taglen + 1; |
|
} |
|
return NULL; |
|
} |
|
|
|
static char *get_modinfo(const struct load_info *info, const char *tag) |
|
{ |
|
return get_next_modinfo(info, tag, NULL); |
|
} |
|
|
|
static void setup_modinfo(struct module *mod, struct load_info *info) |
|
{ |
|
struct module_attribute *attr; |
|
int i; |
|
|
|
for (i = 0; (attr = modinfo_attrs[i]); i++) { |
|
if (attr->setup) |
|
attr->setup(mod, get_modinfo(info, attr->attr.name)); |
|
} |
|
} |
|
|
|
static void free_modinfo(struct module *mod) |
|
{ |
|
struct module_attribute *attr; |
|
int i; |
|
|
|
for (i = 0; (attr = modinfo_attrs[i]); i++) { |
|
if (attr->free) |
|
attr->free(mod); |
|
} |
|
} |
|
|
|
#ifdef CONFIG_KALLSYMS |
|
|
|
/* Lookup exported symbol in given range of kernel_symbols */ |
|
static const struct kernel_symbol *lookup_exported_symbol(const char *name, |
|
const struct kernel_symbol *start, |
|
const struct kernel_symbol *stop) |
|
{ |
|
return bsearch(name, start, stop - start, |
|
sizeof(struct kernel_symbol), cmp_name); |
|
} |
|
|
|
static int is_exported(const char *name, unsigned long value, |
|
const struct module *mod) |
|
{ |
|
const struct kernel_symbol *ks; |
|
if (!mod) |
|
ks = lookup_exported_symbol(name, __start___ksymtab, __stop___ksymtab); |
|
else |
|
ks = lookup_exported_symbol(name, mod->syms, mod->syms + mod->num_syms); |
|
|
|
return ks != NULL && kernel_symbol_value(ks) == value; |
|
} |
|
|
|
/* As per nm */ |
|
static char elf_type(const Elf_Sym *sym, const struct load_info *info) |
|
{ |
|
const Elf_Shdr *sechdrs = info->sechdrs; |
|
|
|
if (ELF_ST_BIND(sym->st_info) == STB_WEAK) { |
|
if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT) |
|
return 'v'; |
|
else |
|
return 'w'; |
|
} |
|
if (sym->st_shndx == SHN_UNDEF) |
|
return 'U'; |
|
if (sym->st_shndx == SHN_ABS || sym->st_shndx == info->index.pcpu) |
|
return 'a'; |
|
if (sym->st_shndx >= SHN_LORESERVE) |
|
return '?'; |
|
if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR) |
|
return 't'; |
|
if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC |
|
&& sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) { |
|
if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE)) |
|
return 'r'; |
|
else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) |
|
return 'g'; |
|
else |
|
return 'd'; |
|
} |
|
if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) { |
|
if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) |
|
return 's'; |
|
else |
|
return 'b'; |
|
} |
|
if (strstarts(info->secstrings + sechdrs[sym->st_shndx].sh_name, |
|
".debug")) { |
|
return 'n'; |
|
} |
|
return '?'; |
|
} |
|
|
|
static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs, |
|
unsigned int shnum, unsigned int pcpundx) |
|
{ |
|
const Elf_Shdr *sec; |
|
|
|
if (src->st_shndx == SHN_UNDEF |
|
|| src->st_shndx >= shnum |
|
|| !src->st_name) |
|
return false; |
|
|
|
#ifdef CONFIG_KALLSYMS_ALL |
|
if (src->st_shndx == pcpundx) |
|
return true; |
|
#endif |
|
|
|
sec = sechdrs + src->st_shndx; |
|
if (!(sec->sh_flags & SHF_ALLOC) |
|
#ifndef CONFIG_KALLSYMS_ALL |
|
|| !(sec->sh_flags & SHF_EXECINSTR) |
|
#endif |
|
|| (sec->sh_entsize & INIT_OFFSET_MASK)) |
|
return false; |
|
|
|
return true; |
|
} |
|
|
|
/* |
|
* We only allocate and copy the strings needed by the parts of symtab |
|
* we keep. This is simple, but has the effect of making multiple |
|
* copies of duplicates. We could be more sophisticated, see |
|
* linux-kernel thread starting with |
|
* <73defb5e4bca04a6431392cc341112b1@localhost>. |
|
*/ |
|
static void layout_symtab(struct module *mod, struct load_info *info) |
|
{ |
|
Elf_Shdr *symsect = info->sechdrs + info->index.sym; |
|
Elf_Shdr *strsect = info->sechdrs + info->index.str; |
|
const Elf_Sym *src; |
|
unsigned int i, nsrc, ndst, strtab_size = 0; |
|
|
|
/* Put symbol section at end of init part of module. */ |
|
symsect->sh_flags |= SHF_ALLOC; |
|
symsect->sh_entsize = get_offset(mod, &mod->init_layout.size, symsect, |
|
info->index.sym) | INIT_OFFSET_MASK; |
|
pr_debug("\t%s\n", info->secstrings + symsect->sh_name); |
|
|
|
src = (void *)info->hdr + symsect->sh_offset; |
|
nsrc = symsect->sh_size / sizeof(*src); |
|
|
|
/* Compute total space required for the core symbols' strtab. */ |
|
for (ndst = i = 0; i < nsrc; i++) { |
|
if (i == 0 || is_livepatch_module(mod) || |
|
is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum, |
|
info->index.pcpu)) { |
|
strtab_size += strlen(&info->strtab[src[i].st_name])+1; |
|
ndst++; |
|
} |
|
} |
|
|
|
/* Append room for core symbols at end of core part. */ |
|
info->symoffs = ALIGN(mod->core_layout.size, symsect->sh_addralign ?: 1); |
|
info->stroffs = mod->core_layout.size = info->symoffs + ndst * sizeof(Elf_Sym); |
|
mod->core_layout.size += strtab_size; |
|
info->core_typeoffs = mod->core_layout.size; |
|
mod->core_layout.size += ndst * sizeof(char); |
|
mod->core_layout.size = debug_align(mod->core_layout.size); |
|
|
|
/* Put string table section at end of init part of module. */ |
|
strsect->sh_flags |= SHF_ALLOC; |
|
strsect->sh_entsize = get_offset(mod, &mod->init_layout.size, strsect, |
|
info->index.str) | INIT_OFFSET_MASK; |
|
pr_debug("\t%s\n", info->secstrings + strsect->sh_name); |
|
|
|
/* We'll tack temporary mod_kallsyms on the end. */ |
|
mod->init_layout.size = ALIGN(mod->init_layout.size, |
|
__alignof__(struct mod_kallsyms)); |
|
info->mod_kallsyms_init_off = mod->init_layout.size; |
|
mod->init_layout.size += sizeof(struct mod_kallsyms); |
|
info->init_typeoffs = mod->init_layout.size; |
|
mod->init_layout.size += nsrc * sizeof(char); |
|
mod->init_layout.size = debug_align(mod->init_layout.size); |
|
} |
|
|
|
/* |
|
* We use the full symtab and strtab which layout_symtab arranged to |
|
* be appended to the init section. Later we switch to the cut-down |
|
* core-only ones. |
|
*/ |
|
static void add_kallsyms(struct module *mod, const struct load_info *info) |
|
{ |
|
unsigned int i, ndst; |
|
const Elf_Sym *src; |
|
Elf_Sym *dst; |
|
char *s; |
|
Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; |
|
|
|
/* Set up to point into init section. */ |
|
mod->kallsyms = mod->init_layout.base + info->mod_kallsyms_init_off; |
|
|
|
mod->kallsyms->symtab = (void *)symsec->sh_addr; |
|
mod->kallsyms->num_symtab = symsec->sh_size / sizeof(Elf_Sym); |
|
/* Make sure we get permanent strtab: don't use info->strtab. */ |
|
mod->kallsyms->strtab = (void *)info->sechdrs[info->index.str].sh_addr; |
|
mod->kallsyms->typetab = mod->init_layout.base + info->init_typeoffs; |
|
|
|
/* |
|
* Now populate the cut down core kallsyms for after init |
|
* and set types up while we still have access to sections. |
|
*/ |
|
mod->core_kallsyms.symtab = dst = mod->core_layout.base + info->symoffs; |
|
mod->core_kallsyms.strtab = s = mod->core_layout.base + info->stroffs; |
|
mod->core_kallsyms.typetab = mod->core_layout.base + info->core_typeoffs; |
|
src = mod->kallsyms->symtab; |
|
for (ndst = i = 0; i < mod->kallsyms->num_symtab; i++) { |
|
mod->kallsyms->typetab[i] = elf_type(src + i, info); |
|
if (i == 0 || is_livepatch_module(mod) || |
|
is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum, |
|
info->index.pcpu)) { |
|
mod->core_kallsyms.typetab[ndst] = |
|
mod->kallsyms->typetab[i]; |
|
dst[ndst] = src[i]; |
|
dst[ndst++].st_name = s - mod->core_kallsyms.strtab; |
|
s += strlcpy(s, &mod->kallsyms->strtab[src[i].st_name], |
|
KSYM_NAME_LEN) + 1; |
|
} |
|
} |
|
mod->core_kallsyms.num_symtab = ndst; |
|
} |
|
#else |
|
static inline void layout_symtab(struct module *mod, struct load_info *info) |
|
{ |
|
} |
|
|
|
static void add_kallsyms(struct module *mod, const struct load_info *info) |
|
{ |
|
} |
|
#endif /* CONFIG_KALLSYMS */ |
|
|
|
#if IS_ENABLED(CONFIG_KALLSYMS) && IS_ENABLED(CONFIG_STACKTRACE_BUILD_ID) |
|
static void init_build_id(struct module *mod, const struct load_info *info) |
|
{ |
|
const Elf_Shdr *sechdr; |
|
unsigned int i; |
|
|
|
for (i = 0; i < info->hdr->e_shnum; i++) { |
|
sechdr = &info->sechdrs[i]; |
|
if (!sect_empty(sechdr) && sechdr->sh_type == SHT_NOTE && |
|
!build_id_parse_buf((void *)sechdr->sh_addr, mod->build_id, |
|
sechdr->sh_size)) |
|
break; |
|
} |
|
} |
|
#else |
|
static void init_build_id(struct module *mod, const struct load_info *info) |
|
{ |
|
} |
|
#endif |
|
|
|
static void dynamic_debug_setup(struct module *mod, struct _ddebug *debug, unsigned int num) |
|
{ |
|
if (!debug) |
|
return; |
|
ddebug_add_module(debug, num, mod->name); |
|
} |
|
|
|
static void dynamic_debug_remove(struct module *mod, struct _ddebug *debug) |
|
{ |
|
if (debug) |
|
ddebug_remove_module(mod->name); |
|
} |
|
|
|
void * __weak module_alloc(unsigned long size) |
|
{ |
|
return __vmalloc_node_range(size, 1, VMALLOC_START, VMALLOC_END, |
|
GFP_KERNEL, PAGE_KERNEL_EXEC, VM_FLUSH_RESET_PERMS, |
|
NUMA_NO_NODE, __builtin_return_address(0)); |
|
} |
|
|
|
bool __weak module_init_section(const char *name) |
|
{ |
|
return strstarts(name, ".init"); |
|
} |
|
|
|
bool __weak module_exit_section(const char *name) |
|
{ |
|
return strstarts(name, ".exit"); |
|
} |
|
|
|
#ifdef CONFIG_DEBUG_KMEMLEAK |
|
static void kmemleak_load_module(const struct module *mod, |
|
const struct load_info *info) |
|
{ |
|
unsigned int i; |
|
|
|
/* only scan the sections containing data */ |
|
kmemleak_scan_area(mod, sizeof(struct module), GFP_KERNEL); |
|
|
|
for (i = 1; i < info->hdr->e_shnum; i++) { |
|
/* Scan all writable sections that's not executable */ |
|
if (!(info->sechdrs[i].sh_flags & SHF_ALLOC) || |
|
!(info->sechdrs[i].sh_flags & SHF_WRITE) || |
|
(info->sechdrs[i].sh_flags & SHF_EXECINSTR)) |
|
continue; |
|
|
|
kmemleak_scan_area((void *)info->sechdrs[i].sh_addr, |
|
info->sechdrs[i].sh_size, GFP_KERNEL); |
|
} |
|
} |
|
#else |
|
static inline void kmemleak_load_module(const struct module *mod, |
|
const struct load_info *info) |
|
{ |
|
} |
|
#endif |
|
|
|
#ifdef CONFIG_MODULE_SIG |
|
static int module_sig_check(struct load_info *info, int flags) |
|
{ |
|
int err = -ENODATA; |
|
const unsigned long markerlen = sizeof(MODULE_SIG_STRING) - 1; |
|
const char *reason; |
|
const void *mod = info->hdr; |
|
|
|
/* |
|
* Require flags == 0, as a module with version information |
|
* removed is no longer the module that was signed |
|
*/ |
|
if (flags == 0 && |
|
info->len > markerlen && |
|
memcmp(mod + info->len - markerlen, MODULE_SIG_STRING, markerlen) == 0) { |
|
/* We truncate the module to discard the signature */ |
|
info->len -= markerlen; |
|
err = mod_verify_sig(mod, info); |
|
if (!err) { |
|
info->sig_ok = true; |
|
return 0; |
|
} |
|
} |
|
|
|
/* |
|
* We don't permit modules to be loaded into the trusted kernels |
|
* without a valid signature on them, but if we're not enforcing, |
|
* certain errors are non-fatal. |
|
*/ |
|
switch (err) { |
|
case -ENODATA: |
|
reason = "unsigned module"; |
|
break; |
|
case -ENOPKG: |
|
reason = "module with unsupported crypto"; |
|
break; |
|
case -ENOKEY: |
|
reason = "module with unavailable key"; |
|
break; |
|
|
|
default: |
|
/* |
|
* All other errors are fatal, including lack of memory, |
|
* unparseable signatures, and signature check failures -- |
|
* even if signatures aren't required. |
|
*/ |
|
return err; |
|
} |
|
|
|
if (is_module_sig_enforced()) { |
|
pr_notice("Loading of %s is rejected\n", reason); |
|
return -EKEYREJECTED; |
|
} |
|
|
|
return security_locked_down(LOCKDOWN_MODULE_SIGNATURE); |
|
} |
|
#else /* !CONFIG_MODULE_SIG */ |
|
static int module_sig_check(struct load_info *info, int flags) |
|
{ |
|
return 0; |
|
} |
|
#endif /* !CONFIG_MODULE_SIG */ |
|
|
|
static int validate_section_offset(struct load_info *info, Elf_Shdr *shdr) |
|
{ |
|
unsigned long secend; |
|
|
|
/* |
|
* Check for both overflow and offset/size being |
|
* too large. |
|
*/ |
|
secend = shdr->sh_offset + shdr->sh_size; |
|
if (secend < shdr->sh_offset || secend > info->len) |
|
return -ENOEXEC; |
|
|
|
return 0; |
|
} |
|
|
|
/* |
|
* Sanity checks against invalid binaries, wrong arch, weird elf version. |
|
* |
|
* Also do basic validity checks against section offsets and sizes, the |
|
* section name string table, and the indices used for it (sh_name). |
|
*/ |
|
static int elf_validity_check(struct load_info *info) |
|
{ |
|
unsigned int i; |
|
Elf_Shdr *shdr, *strhdr; |
|
int err; |
|
|
|
if (info->len < sizeof(*(info->hdr))) |
|
return -ENOEXEC; |
|
|
|
if (memcmp(info->hdr->e_ident, ELFMAG, SELFMAG) != 0 |
|
|| info->hdr->e_type != ET_REL |
|
|| !elf_check_arch(info->hdr) |
|
|| info->hdr->e_shentsize != sizeof(Elf_Shdr)) |
|
return -ENOEXEC; |
|
|
|
/* |
|
* e_shnum is 16 bits, and sizeof(Elf_Shdr) is |
|
* known and small. So e_shnum * sizeof(Elf_Shdr) |
|
* will not overflow unsigned long on any platform. |
|
*/ |
|
if (info->hdr->e_shoff >= info->len |
|
|| (info->hdr->e_shnum * sizeof(Elf_Shdr) > |
|
info->len - info->hdr->e_shoff)) |
|
return -ENOEXEC; |
|
|
|
info->sechdrs = (void *)info->hdr + info->hdr->e_shoff; |
|
|
|
/* |
|
* Verify if the section name table index is valid. |
|
*/ |
|
if (info->hdr->e_shstrndx == SHN_UNDEF |
|
|| info->hdr->e_shstrndx >= info->hdr->e_shnum) |
|
return -ENOEXEC; |
|
|
|
strhdr = &info->sechdrs[info->hdr->e_shstrndx]; |
|
err = validate_section_offset(info, strhdr); |
|
if (err < 0) |
|
return err; |
|
|
|
/* |
|
* The section name table must be NUL-terminated, as required |
|
* by the spec. This makes strcmp and pr_* calls that access |
|
* strings in the section safe. |
|
*/ |
|
info->secstrings = (void *)info->hdr + strhdr->sh_offset; |
|
if (info->secstrings[strhdr->sh_size - 1] != '\0') |
|
return -ENOEXEC; |
|
|
|
/* |
|
* The code assumes that section 0 has a length of zero and |
|
* an addr of zero, so check for it. |
|
*/ |
|
if (info->sechdrs[0].sh_type != SHT_NULL |
|
|| info->sechdrs[0].sh_size != 0 |
|
|| info->sechdrs[0].sh_addr != 0) |
|
return -ENOEXEC; |
|
|
|
for (i = 1; i < info->hdr->e_shnum; i++) { |
|
shdr = &info->sechdrs[i]; |
|
switch (shdr->sh_type) { |
|
case SHT_NULL: |
|
case SHT_NOBITS: |
|
continue; |
|
case SHT_SYMTAB: |
|
if (shdr->sh_link == SHN_UNDEF |
|
|| shdr->sh_link >= info->hdr->e_shnum) |
|
return -ENOEXEC; |
|
fallthrough; |
|
default: |
|
err = validate_section_offset(info, shdr); |
|
if (err < 0) { |
|
pr_err("Invalid ELF section in module (section %u type %u)\n", |
|
i, shdr->sh_type); |
|
return err; |
|
} |
|
|
|
if (shdr->sh_flags & SHF_ALLOC) { |
|
if (shdr->sh_name >= strhdr->sh_size) { |
|
pr_err("Invalid ELF section name in module (section %u type %u)\n", |
|
i, shdr->sh_type); |
|
return -ENOEXEC; |
|
} |
|
} |
|
break; |
|
} |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
#define COPY_CHUNK_SIZE (16*PAGE_SIZE) |
|
|
|
static int copy_chunked_from_user(void *dst, const void __user *usrc, unsigned long len) |
|
{ |
|
do { |
|
unsigned long n = min(len, COPY_CHUNK_SIZE); |
|
|
|
if (copy_from_user(dst, usrc, n) != 0) |
|
return -EFAULT; |
|
cond_resched(); |
|
dst += n; |
|
usrc += n; |
|
len -= n; |
|
} while (len); |
|
return 0; |
|
} |
|
|
|
#ifdef CONFIG_LIVEPATCH |
|
static int check_modinfo_livepatch(struct module *mod, struct load_info *info) |
|
{ |
|
if (get_modinfo(info, "livepatch")) { |
|
mod->klp = true; |
|
add_taint_module(mod, TAINT_LIVEPATCH, LOCKDEP_STILL_OK); |
|
pr_notice_once("%s: tainting kernel with TAINT_LIVEPATCH\n", |
|
mod->name); |
|
} |
|
|
|
return 0; |
|
} |
|
#else /* !CONFIG_LIVEPATCH */ |
|
static int check_modinfo_livepatch(struct module *mod, struct load_info *info) |
|
{ |
|
if (get_modinfo(info, "livepatch")) { |
|
pr_err("%s: module is marked as livepatch module, but livepatch support is disabled", |
|
mod->name); |
|
return -ENOEXEC; |
|
} |
|
|
|
return 0; |
|
} |
|
#endif /* CONFIG_LIVEPATCH */ |
|
|
|
static void check_modinfo_retpoline(struct module *mod, struct load_info *info) |
|
{ |
|
if (retpoline_module_ok(get_modinfo(info, "retpoline"))) |
|
return; |
|
|
|
pr_warn("%s: loading module not compiled with retpoline compiler.\n", |
|
mod->name); |
|
} |
|
|
|
/* Sets info->hdr and info->len. */ |
|
static int copy_module_from_user(const void __user *umod, unsigned long len, |
|
struct load_info *info) |
|
{ |
|
int err; |
|
|
|
info->len = len; |
|
if (info->len < sizeof(*(info->hdr))) |
|
return -ENOEXEC; |
|
|
|
err = security_kernel_load_data(LOADING_MODULE, true); |
|
if (err) |
|
return err; |
|
|
|
/* Suck in entire file: we'll want most of it. */ |
|
info->hdr = __vmalloc(info->len, GFP_KERNEL | __GFP_NOWARN); |
|
if (!info->hdr) |
|
return -ENOMEM; |
|
|
|
if (copy_chunked_from_user(info->hdr, umod, info->len) != 0) { |
|
err = -EFAULT; |
|
goto out; |
|
} |
|
|
|
err = security_kernel_post_load_data((char *)info->hdr, info->len, |
|
LOADING_MODULE, "init_module"); |
|
out: |
|
if (err) |
|
vfree(info->hdr); |
|
|
|
return err; |
|
} |
|
|
|
static void free_copy(struct load_info *info) |
|
{ |
|
vfree(info->hdr); |
|
} |
|
|
|
static int rewrite_section_headers(struct load_info *info, int flags) |
|
{ |
|
unsigned int i; |
|
|
|
/* This should always be true, but let's be sure. */ |
|
info->sechdrs[0].sh_addr = 0; |
|
|
|
for (i = 1; i < info->hdr->e_shnum; i++) { |
|
Elf_Shdr *shdr = &info->sechdrs[i]; |
|
|
|
/* |
|
* Mark all sections sh_addr with their address in the |
|
* temporary image. |
|
*/ |
|
shdr->sh_addr = (size_t)info->hdr + shdr->sh_offset; |
|
|
|
} |
|
|
|
/* Track but don't keep modinfo and version sections. */ |
|
info->sechdrs[info->index.vers].sh_flags &= ~(unsigned long)SHF_ALLOC; |
|
info->sechdrs[info->index.info].sh_flags &= ~(unsigned long)SHF_ALLOC; |
|
|
|
return 0; |
|
} |
|
|
|
/* |
|
* Set up our basic convenience variables (pointers to section headers, |
|
* search for module section index etc), and do some basic section |
|
* verification. |
|
* |
|
* Set info->mod to the temporary copy of the module in info->hdr. The final one |
|
* will be allocated in move_module(). |
|
*/ |
|
static int setup_load_info(struct load_info *info, int flags) |
|
{ |
|
unsigned int i; |
|
|
|
/* Try to find a name early so we can log errors with a module name */ |
|
info->index.info = find_sec(info, ".modinfo"); |
|
if (info->index.info) |
|
info->name = get_modinfo(info, "name"); |
|
|
|
/* Find internal symbols and strings. */ |
|
for (i = 1; i < info->hdr->e_shnum; i++) { |
|
if (info->sechdrs[i].sh_type == SHT_SYMTAB) { |
|
info->index.sym = i; |
|
info->index.str = info->sechdrs[i].sh_link; |
|
info->strtab = (char *)info->hdr |
|
+ info->sechdrs[info->index.str].sh_offset; |
|
break; |
|
} |
|
} |
|
|
|
if (info->index.sym == 0) { |
|
pr_warn("%s: module has no symbols (stripped?)\n", |
|
info->name ?: "(missing .modinfo section or name field)"); |
|
return -ENOEXEC; |
|
} |
|
|
|
info->index.mod = find_sec(info, ".gnu.linkonce.this_module"); |
|
if (!info->index.mod) { |
|
pr_warn("%s: No module found in object\n", |
|
info->name ?: "(missing .modinfo section or name field)"); |
|
return -ENOEXEC; |
|
} |
|
/* This is temporary: point mod into copy of data. */ |
|
info->mod = (void *)info->hdr + info->sechdrs[info->index.mod].sh_offset; |
|
|
|
/* |
|
* If we didn't load the .modinfo 'name' field earlier, fall back to |
|
* on-disk struct mod 'name' field. |
|
*/ |
|
if (!info->name) |
|
info->name = info->mod->name; |
|
|
|
if (flags & MODULE_INIT_IGNORE_MODVERSIONS) |
|
info->index.vers = 0; /* Pretend no __versions section! */ |
|
else |
|
info->index.vers = find_sec(info, "__versions"); |
|
|
|
info->index.pcpu = find_pcpusec(info); |
|
|
|
return 0; |
|
} |
|
|
|
static int check_modinfo(struct module *mod, struct load_info *info, int flags) |
|
{ |
|
const char *modmagic = get_modinfo(info, "vermagic"); |
|
int err; |
|
|
|
if (flags & MODULE_INIT_IGNORE_VERMAGIC) |
|
modmagic = NULL; |
|
|
|
/* This is allowed: modprobe --force will invalidate it. */ |
|
if (!modmagic) { |
|
err = try_to_force_load(mod, "bad vermagic"); |
|
if (err) |
|
return err; |
|
} else if (!same_magic(modmagic, vermagic, info->index.vers)) { |
|
pr_err("%s: version magic '%s' should be '%s'\n", |
|
info->name, modmagic, vermagic); |
|
return -ENOEXEC; |
|
} |
|
|
|
if (!get_modinfo(info, "intree")) { |
|
if (!test_taint(TAINT_OOT_MODULE)) |
|
pr_warn("%s: loading out-of-tree module taints kernel.\n", |
|
mod->name); |
|
add_taint_module(mod, TAINT_OOT_MODULE, LOCKDEP_STILL_OK); |
|
} |
|
|
|
check_modinfo_retpoline(mod, info); |
|
|
|
if (get_modinfo(info, "staging")) { |
|
add_taint_module(mod, TAINT_CRAP, LOCKDEP_STILL_OK); |
|
pr_warn("%s: module is from the staging directory, the quality " |
|
"is unknown, you have been warned.\n", mod->name); |
|
} |
|
|
|
err = check_modinfo_livepatch(mod, info); |
|
if (err) |
|
return err; |
|
|
|
/* Set up license info based on the info section */ |
|
set_license(mod, get_modinfo(info, "license")); |
|
|
|
return 0; |
|
} |
|
|
|
static int find_module_sections(struct module *mod, struct load_info *info) |
|
{ |
|
mod->kp = section_objs(info, "__param", |
|
sizeof(*mod->kp), &mod->num_kp); |
|
mod->syms = section_objs(info, "__ksymtab", |
|
sizeof(*mod->syms), &mod->num_syms); |
|
mod->crcs = section_addr(info, "__kcrctab"); |
|
mod->gpl_syms = section_objs(info, "__ksymtab_gpl", |
|
sizeof(*mod->gpl_syms), |
|
&mod->num_gpl_syms); |
|
mod->gpl_crcs = section_addr(info, "__kcrctab_gpl"); |
|
|
|
#ifdef CONFIG_CONSTRUCTORS |
|
mod->ctors = section_objs(info, ".ctors", |
|
sizeof(*mod->ctors), &mod->num_ctors); |
|
if (!mod->ctors) |
|
mod->ctors = section_objs(info, ".init_array", |
|
sizeof(*mod->ctors), &mod->num_ctors); |
|
else if (find_sec(info, ".init_array")) { |
|
/* |
|
* This shouldn't happen with same compiler and binutils |
|
* building all parts of the module. |
|
*/ |
|
pr_warn("%s: has both .ctors and .init_array.\n", |
|
mod->name); |
|
return -EINVAL; |
|
} |
|
#endif |
|
|
|
mod->noinstr_text_start = section_objs(info, ".noinstr.text", 1, |
|
&mod->noinstr_text_size); |
|
|
|
#ifdef CONFIG_TRACEPOINTS |
|
mod->tracepoints_ptrs = section_objs(info, "__tracepoints_ptrs", |
|
sizeof(*mod->tracepoints_ptrs), |
|
&mod->num_tracepoints); |
|
#endif |
|
#ifdef CONFIG_TREE_SRCU |
|
mod->srcu_struct_ptrs = section_objs(info, "___srcu_struct_ptrs", |
|
sizeof(*mod->srcu_struct_ptrs), |
|
&mod->num_srcu_structs); |
|
#endif |
|
#ifdef CONFIG_BPF_EVENTS |
|
mod->bpf_raw_events = section_objs(info, "__bpf_raw_tp_map", |
|
sizeof(*mod->bpf_raw_events), |
|
&mod->num_bpf_raw_events); |
|
#endif |
|
#ifdef CONFIG_DEBUG_INFO_BTF_MODULES |
|
mod->btf_data = any_section_objs(info, ".BTF", 1, &mod->btf_data_size); |
|
#endif |
|
#ifdef CONFIG_JUMP_LABEL |
|
mod->jump_entries = section_objs(info, "__jump_table", |
|
sizeof(*mod->jump_entries), |
|
&mod->num_jump_entries); |
|
#endif |
|
#ifdef CONFIG_EVENT_TRACING |
|
mod->trace_events = section_objs(info, "_ftrace_events", |
|
sizeof(*mod->trace_events), |
|
&mod->num_trace_events); |
|
mod->trace_evals = section_objs(info, "_ftrace_eval_map", |
|
sizeof(*mod->trace_evals), |
|
&mod->num_trace_evals); |
|
#endif |
|
#ifdef CONFIG_TRACING |
|
mod->trace_bprintk_fmt_start = section_objs(info, "__trace_printk_fmt", |
|
sizeof(*mod->trace_bprintk_fmt_start), |
|
&mod->num_trace_bprintk_fmt); |
|
#endif |
|
#ifdef CONFIG_FTRACE_MCOUNT_RECORD |
|
/* sechdrs[0].sh_size is always zero */ |
|
mod->ftrace_callsites = section_objs(info, FTRACE_CALLSITE_SECTION, |
|
sizeof(*mod->ftrace_callsites), |
|
&mod->num_ftrace_callsites); |
|
#endif |
|
#ifdef CONFIG_FUNCTION_ERROR_INJECTION |
|
mod->ei_funcs = section_objs(info, "_error_injection_whitelist", |
|
sizeof(*mod->ei_funcs), |
|
&mod->num_ei_funcs); |
|
#endif |
|
#ifdef CONFIG_KPROBES |
|
mod->kprobes_text_start = section_objs(info, ".kprobes.text", 1, |
|
&mod->kprobes_text_size); |
|
mod->kprobe_blacklist = section_objs(info, "_kprobe_blacklist", |
|
sizeof(unsigned long), |
|
&mod->num_kprobe_blacklist); |
|
#endif |
|
#ifdef CONFIG_PRINTK_INDEX |
|
mod->printk_index_start = section_objs(info, ".printk_index", |
|
sizeof(*mod->printk_index_start), |
|
&mod->printk_index_size); |
|
#endif |
|
#ifdef CONFIG_HAVE_STATIC_CALL_INLINE |
|
mod->static_call_sites = section_objs(info, ".static_call_sites", |
|
sizeof(*mod->static_call_sites), |
|
&mod->num_static_call_sites); |
|
#endif |
|
mod->extable = section_objs(info, "__ex_table", |
|
sizeof(*mod->extable), &mod->num_exentries); |
|
|
|
if (section_addr(info, "__obsparm")) |
|
pr_warn("%s: Ignoring obsolete parameters\n", mod->name); |
|
|
|
info->debug = section_objs(info, "__dyndbg", |
|
sizeof(*info->debug), &info->num_debug); |
|
|
|
return 0; |
|
} |
|
|
|
static int move_module(struct module *mod, struct load_info *info) |
|
{ |
|
int i; |
|
void *ptr; |
|
|
|
/* Do the allocs. */ |
|
ptr = module_alloc(mod->core_layout.size); |
|
/* |
|
* The pointer to this block is stored in the module structure |
|
* which is inside the block. Just mark it as not being a |
|
* leak. |
|
*/ |
|
kmemleak_not_leak(ptr); |
|
if (!ptr) |
|
return -ENOMEM; |
|
|
|
memset(ptr, 0, mod->core_layout.size); |
|
mod->core_layout.base = ptr; |
|
|
|
if (mod->init_layout.size) { |
|
ptr = module_alloc(mod->init_layout.size); |
|
/* |
|
* The pointer to this block is stored in the module structure |
|
* which is inside the block. This block doesn't need to be |
|
* scanned as it contains data and code that will be freed |
|
* after the module is initialized. |
|
*/ |
|
kmemleak_ignore(ptr); |
|
if (!ptr) { |
|
module_memfree(mod->core_layout.base); |
|
return -ENOMEM; |
|
} |
|
memset(ptr, 0, mod->init_layout.size); |
|
mod->init_layout.base = ptr; |
|
} else |
|
mod->init_layout.base = NULL; |
|
|
|
/* Transfer each section which specifies SHF_ALLOC */ |
|
pr_debug("final section addresses:\n"); |
|
for (i = 0; i < info->hdr->e_shnum; i++) { |
|
void *dest; |
|
Elf_Shdr *shdr = &info->sechdrs[i]; |
|
|
|
if (!(shdr->sh_flags & SHF_ALLOC)) |
|
continue; |
|
|
|
if (shdr->sh_entsize & INIT_OFFSET_MASK) |
|
dest = mod->init_layout.base |
|
+ (shdr->sh_entsize & ~INIT_OFFSET_MASK); |
|
else |
|
dest = mod->core_layout.base + shdr->sh_entsize; |
|
|
|
if (shdr->sh_type != SHT_NOBITS) |
|
memcpy(dest, (void *)shdr->sh_addr, shdr->sh_size); |
|
/* Update sh_addr to point to copy in image. */ |
|
shdr->sh_addr = (unsigned long)dest; |
|
pr_debug("\t0x%lx %s\n", |
|
(long)shdr->sh_addr, info->secstrings + shdr->sh_name); |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int check_module_license_and_versions(struct module *mod) |
|
{ |
|
int prev_taint = test_taint(TAINT_PROPRIETARY_MODULE); |
|
|
|
/* |
|
* ndiswrapper is under GPL by itself, but loads proprietary modules. |
|
* Don't use add_taint_module(), as it would prevent ndiswrapper from |
|
* using GPL-only symbols it needs. |
|
*/ |
|
if (strcmp(mod->name, "ndiswrapper") == 0) |
|
add_taint(TAINT_PROPRIETARY_MODULE, LOCKDEP_NOW_UNRELIABLE); |
|
|
|
/* driverloader was caught wrongly pretending to be under GPL */ |
|
if (strcmp(mod->name, "driverloader") == 0) |
|
add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
|
LOCKDEP_NOW_UNRELIABLE); |
|
|
|
/* lve claims to be GPL but upstream won't provide source */ |
|
if (strcmp(mod->name, "lve") == 0) |
|
add_taint_module(mod, TAINT_PROPRIETARY_MODULE, |
|
LOCKDEP_NOW_UNRELIABLE); |
|
|
|
if (!prev_taint && test_taint(TAINT_PROPRIETARY_MODULE)) |
|
pr_warn("%s: module license taints kernel.\n", mod->name); |
|
|
|
#ifdef CONFIG_MODVERSIONS |
|
if ((mod->num_syms && !mod->crcs) || |
|
(mod->num_gpl_syms && !mod->gpl_crcs)) { |
|
return try_to_force_load(mod, |
|
"no versions for exported symbols"); |
|
} |
|
#endif |
|
return 0; |
|
} |
|
|
|
static void flush_module_icache(const struct module *mod) |
|
{ |
|
/* |
|
* Flush the instruction cache, since we've played with text. |
|
* Do it before processing of module parameters, so the module |
|
* can provide parameter accessor functions of its own. |
|
*/ |
|
if (mod->init_layout.base) |
|
flush_icache_range((unsigned long)mod->init_layout.base, |
|
(unsigned long)mod->init_layout.base |
|
+ mod->init_layout.size); |
|
flush_icache_range((unsigned long)mod->core_layout.base, |
|
(unsigned long)mod->core_layout.base + mod->core_layout.size); |
|
} |
|
|
|
int __weak module_frob_arch_sections(Elf_Ehdr *hdr, |
|
Elf_Shdr *sechdrs, |
|
char *secstrings, |
|
struct module *mod) |
|
{ |
|
return 0; |
|
} |
|
|
|
/* module_blacklist is a comma-separated list of module names */ |
|
static char *module_blacklist; |
|
static bool blacklisted(const char *module_name) |
|
{ |
|
const char *p; |
|
size_t len; |
|
|
|
if (!module_blacklist) |
|
return false; |
|
|
|
for (p = module_blacklist; *p; p += len) { |
|
len = strcspn(p, ","); |
|
if (strlen(module_name) == len && !memcmp(module_name, p, len)) |
|
return true; |
|
if (p[len] == ',') |
|
len++; |
|
} |
|
return false; |
|
} |
|
core_param(module_blacklist, module_blacklist, charp, 0400); |
|
|
|
static struct module *layout_and_allocate(struct load_info *info, int flags) |
|
{ |
|
struct module *mod; |
|
unsigned int ndx; |
|
int err; |
|
|
|
err = check_modinfo(info->mod, info, flags); |
|
if (err) |
|
return ERR_PTR(err); |
|
|
|
/* Allow arches to frob section contents and sizes. */ |
|
err = module_frob_arch_sections(info->hdr, info->sechdrs, |
|
info->secstrings, info->mod); |
|
if (err < 0) |
|
return ERR_PTR(err); |
|
|
|
err = module_enforce_rwx_sections(info->hdr, info->sechdrs, |
|
info->secstrings, info->mod); |
|
if (err < 0) |
|
return ERR_PTR(err); |
|
|
|
/* We will do a special allocation for per-cpu sections later. */ |
|
info->sechdrs[info->index.pcpu].sh_flags &= ~(unsigned long)SHF_ALLOC; |
|
|
|
/* |
|
* Mark ro_after_init section with SHF_RO_AFTER_INIT so that |
|
* layout_sections() can put it in the right place. |
|
* Note: ro_after_init sections also have SHF_{WRITE,ALLOC} set. |
|
*/ |
|
ndx = find_sec(info, ".data..ro_after_init"); |
|
if (ndx) |
|
info->sechdrs[ndx].sh_flags |= SHF_RO_AFTER_INIT; |
|
/* |
|
* Mark the __jump_table section as ro_after_init as well: these data |
|
* structures are never modified, with the exception of entries that |
|
* refer to code in the __init section, which are annotated as such |
|
* at module load time. |
|
*/ |
|
ndx = find_sec(info, "__jump_table"); |
|
if (ndx) |
|
info->sechdrs[ndx].sh_flags |= SHF_RO_AFTER_INIT; |
|
|
|
/* |
|
* Determine total sizes, and put offsets in sh_entsize. For now |
|
* this is done generically; there doesn't appear to be any |
|
* special cases for the architectures. |
|
*/ |
|
layout_sections(info->mod, info); |
|
layout_symtab(info->mod, info); |
|
|
|
/* Allocate and move to the final place */ |
|
err = move_module(info->mod, info); |
|
if (err) |
|
return ERR_PTR(err); |
|
|
|
/* Module has been copied to its final place now: return it. */ |
|
mod = (void *)info->sechdrs[info->index.mod].sh_addr; |
|
kmemleak_load_module(mod, info); |
|
return mod; |
|
} |
|
|
|
/* mod is no longer valid after this! */ |
|
static void module_deallocate(struct module *mod, struct load_info *info) |
|
{ |
|
percpu_modfree(mod); |
|
module_arch_freeing_init(mod); |
|
module_memfree(mod->init_layout.base); |
|
module_memfree(mod->core_layout.base); |
|
} |
|
|
|
int __weak module_finalize(const Elf_Ehdr *hdr, |
|
const Elf_Shdr *sechdrs, |
|
struct module *me) |
|
{ |
|
return 0; |
|
} |
|
|
|
static int post_relocation(struct module *mod, const struct load_info *info) |
|
{ |
|
/* Sort exception table now relocations are done. */ |
|
sort_extable(mod->extable, mod->extable + mod->num_exentries); |
|
|
|
/* Copy relocated percpu area over. */ |
|
percpu_modcopy(mod, (void *)info->sechdrs[info->index.pcpu].sh_addr, |
|
info->sechdrs[info->index.pcpu].sh_size); |
|
|
|
/* Setup kallsyms-specific fields. */ |
|
add_kallsyms(mod, info); |
|
|
|
/* Arch-specific module finalizing. */ |
|
return module_finalize(info->hdr, info->sechdrs, mod); |
|
} |
|
|
|
/* Is this module of this name done loading? No locks held. */ |
|
static bool finished_loading(const char *name) |
|
{ |
|
struct module *mod; |
|
bool ret; |
|
|
|
/* |
|
* The module_mutex should not be a heavily contended lock; |
|
* if we get the occasional sleep here, we'll go an extra iteration |
|
* in the wait_event_interruptible(), which is harmless. |
|
*/ |
|
sched_annotate_sleep(); |
|
mutex_lock(&module_mutex); |
|
mod = find_module_all(name, strlen(name), true); |
|
ret = !mod || mod->state == MODULE_STATE_LIVE; |
|
mutex_unlock(&module_mutex); |
|
|
|
return ret; |
|
} |
|
|
|
/* Call module constructors. */ |
|
static void do_mod_ctors(struct module *mod) |
|
{ |
|
#ifdef CONFIG_CONSTRUCTORS |
|
unsigned long i; |
|
|
|
for (i = 0; i < mod->num_ctors; i++) |
|
mod->ctors[i](); |
|
#endif |
|
} |
|
|
|
/* For freeing module_init on success, in case kallsyms traversing */ |
|
struct mod_initfree { |
|
struct llist_node node; |
|
void *module_init; |
|
}; |
|
|
|
static void do_free_init(struct work_struct *w) |
|
{ |
|
struct llist_node *pos, *n, *list; |
|
struct mod_initfree *initfree; |
|
|
|
list = llist_del_all(&init_free_list); |
|
|
|
synchronize_rcu(); |
|
|
|
llist_for_each_safe(pos, n, list) { |
|
initfree = container_of(pos, struct mod_initfree, node); |
|
module_memfree(initfree->module_init); |
|
kfree(initfree); |
|
} |
|
} |
|
|
|
/* |
|
* This is where the real work happens. |
|
* |
|
* Keep it uninlined to provide a reliable breakpoint target, e.g. for the gdb |
|
* helper command 'lx-symbols'. |
|
*/ |
|
static noinline int do_init_module(struct module *mod) |
|
{ |
|
int ret = 0; |
|
struct mod_initfree *freeinit; |
|
|
|
freeinit = kmalloc(sizeof(*freeinit), GFP_KERNEL); |
|
if (!freeinit) { |
|
ret = -ENOMEM; |
|
goto fail; |
|
} |
|
freeinit->module_init = mod->init_layout.base; |
|
|
|
/* |
|
* We want to find out whether @mod uses async during init. Clear |
|
* PF_USED_ASYNC. async_schedule*() will set it. |
|
*/ |
|
current->flags &= ~PF_USED_ASYNC; |
|
|
|
do_mod_ctors(mod); |
|
/* Start the module */ |
|
if (mod->init != NULL) |
|
ret = do_one_initcall(mod->init); |
|
if (ret < 0) { |
|
goto fail_free_freeinit; |
|
} |
|
if (ret > 0) { |
|
pr_warn("%s: '%s'->init suspiciously returned %d, it should " |
|
"follow 0/-E convention\n" |
|
"%s: loading module anyway...\n", |
|
__func__, mod->name, ret, __func__); |
|
dump_stack(); |
|
} |
|
|
|
/* Now it's a first class citizen! */ |
|
mod->state = MODULE_STATE_LIVE; |
|
blocking_notifier_call_chain(&module_notify_list, |
|
MODULE_STATE_LIVE, mod); |
|
|
|
/* Delay uevent until module has finished its init routine */ |
|
kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD); |
|
|
|
/* |
|
* We need to finish all async code before the module init sequence |
|
* is done. This has potential to deadlock. For example, a newly |
|
* detected block device can trigger request_module() of the |
|
* default iosched from async probing task. Once userland helper |
|
* reaches here, async_synchronize_full() will wait on the async |
|
* task waiting on request_module() and deadlock. |
|
* |
|
* This deadlock is avoided by perfomring async_synchronize_full() |
|
* iff module init queued any async jobs. This isn't a full |
|
* solution as it will deadlock the same if module loading from |
|
* async jobs nests more than once; however, due to the various |
|
* constraints, this hack seems to be the best option for now. |
|
* Please refer to the following thread for details. |
|
* |
|
* http://thread.gmane.org/gmane.linux.kernel/1420814 |
|
*/ |
|
if (!mod->async_probe_requested && (current->flags & PF_USED_ASYNC)) |
|
async_synchronize_full(); |
|
|
|
ftrace_free_mem(mod, mod->init_layout.base, mod->init_layout.base + |
|
mod->init_layout.size); |
|
mutex_lock(&module_mutex); |
|
/* Drop initial reference. */ |
|
module_put(mod); |
|
trim_init_extable(mod); |
|
#ifdef CONFIG_KALLSYMS |
|
/* Switch to core kallsyms now init is done: kallsyms may be walking! */ |
|
rcu_assign_pointer(mod->kallsyms, &mod->core_kallsyms); |
|
#endif |
|
module_enable_ro(mod, true); |
|
mod_tree_remove_init(mod); |
|
module_arch_freeing_init(mod); |
|
mod->init_layout.base = NULL; |
|
mod->init_layout.size = 0; |
|
mod->init_layout.ro_size = 0; |
|
mod->init_layout.ro_after_init_size = 0; |
|
mod->init_layout.text_size = 0; |
|
#ifdef CONFIG_DEBUG_INFO_BTF_MODULES |
|
/* .BTF is not SHF_ALLOC and will get removed, so sanitize pointer */ |
|
mod->btf_data = NULL; |
|
#endif |
|
/* |
|
* We want to free module_init, but be aware that kallsyms may be |
|
* walking this with preempt disabled. In all the failure paths, we |
|
* call synchronize_rcu(), but we don't want to slow down the success |
|
* path. module_memfree() cannot be called in an interrupt, so do the |
|
* work and call synchronize_rcu() in a work queue. |
|
* |
|
* Note that module_alloc() on most architectures creates W+X page |
|
* mappings which won't be cleaned up until do_free_init() runs. Any |
|
* code such as mark_rodata_ro() which depends on those mappings to |
|
* be cleaned up needs to sync with the queued work - ie |
|
* rcu_barrier() |
|
*/ |
|
if (llist_add(&freeinit->node, &init_free_list)) |
|
schedule_work(&init_free_wq); |
|
|
|
mutex_unlock(&module_mutex); |
|
wake_up_all(&module_wq); |
|
|
|
return 0; |
|
|
|
fail_free_freeinit: |
|
kfree(freeinit); |
|
fail: |
|
/* Try to protect us from buggy refcounters. */ |
|
mod->state = MODULE_STATE_GOING; |
|
synchronize_rcu(); |
|
module_put(mod); |
|
blocking_notifier_call_chain(&module_notify_list, |
|
MODULE_STATE_GOING, mod); |
|
klp_module_going(mod); |
|
ftrace_release_mod(mod); |
|
free_module(mod); |
|
wake_up_all(&module_wq); |
|
return ret; |
|
} |
|
|
|
static int may_init_module(void) |
|
{ |
|
if (!capable(CAP_SYS_MODULE) || modules_disabled) |
|
return -EPERM; |
|
|
|
return 0; |
|
} |
|
|
|
/* |
|
* We try to place it in the list now to make sure it's unique before |
|
* we dedicate too many resources. In particular, temporary percpu |
|
* memory exhaustion. |
|
*/ |
|
static int add_unformed_module(struct module *mod) |
|
{ |
|
int err; |
|
struct module *old; |
|
|
|
mod->state = MODULE_STATE_UNFORMED; |
|
|
|
again: |
|
mutex_lock(&module_mutex); |
|
old = find_module_all(mod->name, strlen(mod->name), true); |
|
if (old != NULL) { |
|
if (old->state != MODULE_STATE_LIVE) { |
|
/* Wait in case it fails to load. */ |
|
mutex_unlock(&module_mutex); |
|
err = wait_event_interruptible(module_wq, |
|
finished_loading(mod->name)); |
|
if (err) |
|
goto out_unlocked; |
|
goto again; |
|
} |
|
err = -EEXIST; |
|
goto out; |
|
} |
|
mod_update_bounds(mod); |
|
list_add_rcu(&mod->list, &modules); |
|
mod_tree_insert(mod); |
|
err = 0; |
|
|
|
out: |
|
mutex_unlock(&module_mutex); |
|
out_unlocked: |
|
return err; |
|
} |
|
|
|
static int complete_formation(struct module *mod, struct load_info *info) |
|
{ |
|
int err; |
|
|
|
mutex_lock(&module_mutex); |
|
|
|
/* Find duplicate symbols (must be called under lock). */ |
|
err = verify_exported_symbols(mod); |
|
if (err < 0) |
|
goto out; |
|
|
|
/* This relies on module_mutex for list integrity. */ |
|
module_bug_finalize(info->hdr, info->sechdrs, mod); |
|
|
|
module_enable_ro(mod, false); |
|
module_enable_nx(mod); |
|
module_enable_x(mod); |
|
|
|
/* |
|
* Mark state as coming so strong_try_module_get() ignores us, |
|
* but kallsyms etc. can see us. |
|
*/ |
|
mod->state = MODULE_STATE_COMING; |
|
mutex_unlock(&module_mutex); |
|
|
|
return 0; |
|
|
|
out: |
|
mutex_unlock(&module_mutex); |
|
return err; |
|
} |
|
|
|
static int prepare_coming_module(struct module *mod) |
|
{ |
|
int err; |
|
|
|
ftrace_module_enable(mod); |
|
err = klp_module_coming(mod); |
|
if (err) |
|
return err; |
|
|
|
err = blocking_notifier_call_chain_robust(&module_notify_list, |
|
MODULE_STATE_COMING, MODULE_STATE_GOING, mod); |
|
err = notifier_to_errno(err); |
|
if (err) |
|
klp_module_going(mod); |
|
|
|
return err; |
|
} |
|
|
|
static int unknown_module_param_cb(char *param, char *val, const char *modname, |
|
void *arg) |
|
{ |
|
struct module *mod = arg; |
|
int ret; |
|
|
|
if (strcmp(param, "async_probe") == 0) { |
|
mod->async_probe_requested = true; |
|
return 0; |
|
} |
|
|
|
/* Check for magic 'dyndbg' arg */ |
|
ret = ddebug_dyndbg_module_param_cb(param, val, modname); |
|
if (ret != 0) |
|
pr_warn("%s: unknown parameter '%s' ignored\n", modname, param); |
|
return 0; |
|
} |
|
|
|
static void cfi_init(struct module *mod); |
|
|
|
/* |
|
* Allocate and load the module: note that size of section 0 is always |
|
* zero, and we rely on this for optional sections. |
|
*/ |
|
static int load_module(struct load_info *info, const char __user *uargs, |
|
int flags) |
|
{ |
|
struct module *mod; |
|
long err = 0; |
|
char *after_dashes; |
|
|
|
/* |
|
* Do the signature check (if any) first. All that |
|
* the signature check needs is info->len, it does |
|
* not need any of the section info. That can be |
|
* set up later. This will minimize the chances |
|
* of a corrupt module causing problems before |
|
* we even get to the signature check. |
|
* |
|
* The check will also adjust info->len by stripping |
|
* off the sig length at the end of the module, making |
|
* checks against info->len more correct. |
|
*/ |
|
err = module_sig_check(info, flags); |
|
if (err) |
|
goto free_copy; |
|
|
|
/* |
|
* Do basic sanity checks against the ELF header and |
|
* sections. |
|
*/ |
|
err = elf_validity_check(info); |
|
if (err) { |
|
pr_err("Module has invalid ELF structures\n"); |
|
goto free_copy; |
|
} |
|
|
|
/* |
|
* Everything checks out, so set up the section info |
|
* in the info structure. |
|
*/ |
|
err = setup_load_info(info, flags); |
|
if (err) |
|
goto free_copy; |
|
|
|
/* |
|
* Now that we know we have the correct module name, check |
|
* if it's blacklisted. |
|
*/ |
|
if (blacklisted(info->name)) { |
|
err = -EPERM; |
|
pr_err("Module %s is blacklisted\n", info->name); |
|
goto free_copy; |
|
} |
|
|
|
err = rewrite_section_headers(info, flags); |
|
if (err) |
|
goto free_copy; |
|
|
|
/* Check module struct version now, before we try to use module. */ |
|
if (!check_modstruct_version(info, info->mod)) { |
|
err = -ENOEXEC; |
|
goto free_copy; |
|
} |
|
|
|
/* Figure out module layout, and allocate all the memory. */ |
|
mod = layout_and_allocate(info, flags); |
|
if (IS_ERR(mod)) { |
|
err = PTR_ERR(mod); |
|
goto free_copy; |
|
} |
|
|
|
audit_log_kern_module(mod->name); |
|
|
|
/* Reserve our place in the list. */ |
|
err = add_unformed_module(mod); |
|
if (err) |
|
goto free_module; |
|
|
|
#ifdef CONFIG_MODULE_SIG |
|
mod->sig_ok = info->sig_ok; |
|
if (!mod->sig_ok) { |
|
pr_notice_once("%s: module verification failed: signature " |
|
"and/or required key missing - tainting " |
|
"kernel\n", mod->name); |
|
add_taint_module(mod, TAINT_UNSIGNED_MODULE, LOCKDEP_STILL_OK); |
|
} |
|
#endif |
|
|
|
/* To avoid stressing percpu allocator, do this once we're unique. */ |
|
err = percpu_modalloc(mod, info); |
|
if (err) |
|
goto unlink_mod; |
|
|
|
/* Now module is in final location, initialize linked lists, etc. */ |
|
err = module_unload_init(mod); |
|
if (err) |
|
goto unlink_mod; |
|
|
|
init_param_lock(mod); |
|
|
|
/* |
|
* Now we've got everything in the final locations, we can |
|
* find optional sections. |
|
*/ |
|
err = find_module_sections(mod, info); |
|
if (err) |
|
goto free_unload; |
|
|
|
err = check_module_license_and_versions(mod); |
|
if (err) |
|
goto free_unload; |
|
|
|
/* Set up MODINFO_ATTR fields */ |
|
setup_modinfo(mod, info); |
|
|
|
/* Fix up syms, so that st_value is a pointer to location. */ |
|
err = simplify_symbols(mod, info); |
|
if (err < 0) |
|
goto free_modinfo; |
|
|
|
err = apply_relocations(mod, info); |
|
if (err < 0) |
|
goto free_modinfo; |
|
|
|
err = post_relocation(mod, info); |
|
if (err < 0) |
|
goto free_modinfo; |
|
|
|
flush_module_icache(mod); |
|
|
|
/* Setup CFI for the module. */ |
|
cfi_init(mod); |
|
|
|
/* Now copy in args */ |
|
mod->args = strndup_user(uargs, ~0UL >> 1); |
|
if (IS_ERR(mod->args)) { |
|
err = PTR_ERR(mod->args); |
|
goto free_arch_cleanup; |
|
} |
|
|
|
init_build_id(mod, info); |
|
dynamic_debug_setup(mod, info->debug, info->num_debug); |
|
|
|
/* Ftrace init must be called in the MODULE_STATE_UNFORMED state */ |
|
ftrace_module_init(mod); |
|
|
|
/* Finally it's fully formed, ready to start executing. */ |
|
err = complete_formation(mod, info); |
|
if (err) |
|
goto ddebug_cleanup; |
|
|
|
err = prepare_coming_module(mod); |
|
if (err) |
|
goto bug_cleanup; |
|
|
|
/* Module is ready to execute: parsing args may do that. */ |
|
after_dashes = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, |
|
-32768, 32767, mod, |
|
unknown_module_param_cb); |
|
if (IS_ERR(after_dashes)) { |
|
err = PTR_ERR(after_dashes); |
|
goto coming_cleanup; |
|
} else if (after_dashes) { |
|
pr_warn("%s: parameters '%s' after `--' ignored\n", |
|
mod->name, after_dashes); |
|
} |
|
|
|
/* Link in to sysfs. */ |
|
err = mod_sysfs_setup(mod, info, mod->kp, mod->num_kp); |
|
if (err < 0) |
|
goto coming_cleanup; |
|
|
|
if (is_livepatch_module(mod)) { |
|
err = copy_module_elf(mod, info); |
|
if (err < 0) |
|
goto sysfs_cleanup; |
|
} |
|
|
|
/* Get rid of temporary copy. */ |
|
free_copy(info); |
|
|
|
/* Done! */ |
|
trace_module_load(mod); |
|
|
|
return do_init_module(mod); |
|
|
|
sysfs_cleanup: |
|
mod_sysfs_teardown(mod); |
|
coming_cleanup: |
|
mod->state = MODULE_STATE_GOING; |
|
destroy_params(mod->kp, mod->num_kp); |
|
blocking_notifier_call_chain(&module_notify_list, |
|
MODULE_STATE_GOING, mod); |
|
klp_module_going(mod); |
|
bug_cleanup: |
|
mod->state = MODULE_STATE_GOING; |
|
/* module_bug_cleanup needs module_mutex protection */ |
|
mutex_lock(&module_mutex); |
|
module_bug_cleanup(mod); |
|
mutex_unlock(&module_mutex); |
|
|
|
ddebug_cleanup: |
|
ftrace_release_mod(mod); |
|
dynamic_debug_remove(mod, info->debug); |
|
synchronize_rcu(); |
|
kfree(mod->args); |
|
free_arch_cleanup: |
|
cfi_cleanup(mod); |
|
module_arch_cleanup(mod); |
|
free_modinfo: |
|
free_modinfo(mod); |
|
free_unload: |
|
module_unload_free(mod); |
|
unlink_mod: |
|
mutex_lock(&module_mutex); |
|
/* Unlink carefully: kallsyms could be walking list. */ |
|
list_del_rcu(&mod->list); |
|
mod_tree_remove(mod); |
|
wake_up_all(&module_wq); |
|
/* Wait for RCU-sched synchronizing before releasing mod->list. */ |
|
synchronize_rcu(); |
|
mutex_unlock(&module_mutex); |
|
free_module: |
|
/* Free lock-classes; relies on the preceding sync_rcu() */ |
|
lockdep_free_key_range(mod->core_layout.base, mod->core_layout.size); |
|
|
|
module_deallocate(mod, info); |
|
free_copy: |
|
free_copy(info); |
|
return err; |
|
} |
|
|
|
SYSCALL_DEFINE3(init_module, void __user *, umod, |
|
unsigned long, len, const char __user *, uargs) |
|
{ |
|
int err; |
|
struct load_info info = { }; |
|
|
|
err = may_init_module(); |
|
if (err) |
|
return err; |
|
|
|
pr_debug("init_module: umod=%p, len=%lu, uargs=%p\n", |
|
umod, len, uargs); |
|
|
|
err = copy_module_from_user(umod, len, &info); |
|
if (err) |
|
return err; |
|
|
|
return load_module(&info, uargs, 0); |
|
} |
|
|
|
SYSCALL_DEFINE3(finit_module, int, fd, const char __user *, uargs, int, flags) |
|
{ |
|
struct load_info info = { }; |
|
void *hdr = NULL; |
|
int err; |
|
|
|
err = may_init_module(); |
|
if (err) |
|
return err; |
|
|
|
pr_debug("finit_module: fd=%d, uargs=%p, flags=%i\n", fd, uargs, flags); |
|
|
|
if (flags & ~(MODULE_INIT_IGNORE_MODVERSIONS |
|
|MODULE_INIT_IGNORE_VERMAGIC)) |
|
return -EINVAL; |
|
|
|
err = kernel_read_file_from_fd(fd, 0, &hdr, INT_MAX, NULL, |
|
READING_MODULE); |
|
if (err < 0) |
|
return err; |
|
info.hdr = hdr; |
|
info.len = err; |
|
|
|
return load_module(&info, uargs, flags); |
|
} |
|
|
|
static inline int within(unsigned long addr, void *start, unsigned long size) |
|
{ |
|
return ((void *)addr >= start && (void *)addr < start + size); |
|
} |
|
|
|
#ifdef CONFIG_KALLSYMS |
|
/* |
|
* This ignores the intensely annoying "mapping symbols" found |
|
* in ARM ELF files: $a, $t and $d. |
|
*/ |
|
static inline int is_arm_mapping_symbol(const char *str) |
|
{ |
|
if (str[0] == '.' && str[1] == 'L') |
|
return true; |
|
return str[0] == '$' && strchr("axtd", str[1]) |
|
&& (str[2] == '\0' || str[2] == '.'); |
|
} |
|
|
|
static const char *kallsyms_symbol_name(struct mod_kallsyms *kallsyms, unsigned int symnum) |
|
{ |
|
return kallsyms->strtab + kallsyms->symtab[symnum].st_name; |
|
} |
|
|
|
/* |
|
* Given a module and address, find the corresponding symbol and return its name |
|
* while providing its size and offset if needed. |
|
*/ |
|
static const char *find_kallsyms_symbol(struct module *mod, |
|
unsigned long addr, |
|
unsigned long *size, |
|
unsigned long *offset) |
|
{ |
|
unsigned int i, best = 0; |
|
unsigned long nextval, bestval; |
|
struct mod_kallsyms *kallsyms = rcu_dereference_sched(mod->kallsyms); |
|
|
|
/* At worse, next value is at end of module */ |
|
if (within_module_init(addr, mod)) |
|
nextval = (unsigned long)mod->init_layout.base+mod->init_layout.text_size; |
|
else |
|
nextval = (unsigned long)mod->core_layout.base+mod->core_layout.text_size; |
|
|
|
bestval = kallsyms_symbol_value(&kallsyms->symtab[best]); |
|
|
|
/* |
|
* Scan for closest preceding symbol, and next symbol. (ELF |
|
* starts real symbols at 1). |
|
*/ |
|
for (i = 1; i < kallsyms->num_symtab; i++) { |
|
const Elf_Sym *sym = &kallsyms->symtab[i]; |
|
unsigned long thisval = kallsyms_symbol_value(sym); |
|
|
|
if (sym->st_shndx == SHN_UNDEF) |
|
continue; |
|
|
|
/* |
|
* We ignore unnamed symbols: they're uninformative |
|
* and inserted at a whim. |
|
*/ |
|
if (*kallsyms_symbol_name(kallsyms, i) == '\0' |
|
|| is_arm_mapping_symbol(kallsyms_symbol_name(kallsyms, i))) |
|
continue; |
|
|
|
if (thisval <= addr && thisval > bestval) { |
|
best = i; |
|
bestval = thisval; |
|
} |
|
if (thisval > addr && thisval < nextval) |
|
nextval = thisval; |
|
} |
|
|
|
if (!best) |
|
return NULL; |
|
|
|
if (size) |
|
*size = nextval - bestval; |
|
if (offset) |
|
*offset = addr - bestval; |
|
|
|
return kallsyms_symbol_name(kallsyms, best); |
|
} |
|
|
|
void * __weak dereference_module_function_descriptor(struct module *mod, |
|
void *ptr) |
|
{ |
|
return ptr; |
|
} |
|
|
|
/* |
|
* For kallsyms to ask for address resolution. NULL means not found. Careful |
|
* not to lock to avoid deadlock on oopses, simply disable preemption. |
|
*/ |
|
const char *module_address_lookup(unsigned long addr, |
|
unsigned long *size, |
|
unsigned long *offset, |
|
char **modname, |
|
const unsigned char **modbuildid, |
|
char *namebuf) |
|
{ |
|
const char *ret = NULL; |
|
struct module *mod; |
|
|
|
preempt_disable(); |
|
mod = __module_address(addr); |
|
if (mod) { |
|
if (modname) |
|
*modname = mod->name; |
|
if (modbuildid) { |
|
#if IS_ENABLED(CONFIG_STACKTRACE_BUILD_ID) |
|
*modbuildid = mod->build_id; |
|
#else |
|
*modbuildid = NULL; |
|
#endif |
|
} |
|
|
|
ret = find_kallsyms_symbol(mod, addr, size, offset); |
|
} |
|
/* Make a copy in here where it's safe */ |
|
if (ret) { |
|
strncpy(namebuf, ret, KSYM_NAME_LEN - 1); |
|
ret = namebuf; |
|
} |
|
preempt_enable(); |
|
|
|
return ret; |
|
} |
|
|
|
int lookup_module_symbol_name(unsigned long addr, char *symname) |
|
{ |
|
struct module *mod; |
|
|
|
preempt_disable(); |
|
list_for_each_entry_rcu(mod, &modules, list) { |
|
if (mod->state == MODULE_STATE_UNFORMED) |
|
continue; |
|
if (within_module(addr, mod)) { |
|
const char *sym; |
|
|
|
sym = find_kallsyms_symbol(mod, addr, NULL, NULL); |
|
if (!sym) |
|
goto out; |
|
|
|
strlcpy(symname, sym, KSYM_NAME_LEN); |
|
preempt_enable(); |
|
return 0; |
|
} |
|
} |
|
out: |
|
preempt_enable(); |
|
return -ERANGE; |
|
} |
|
|
|
int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, |
|
unsigned long *offset, char *modname, char *name) |
|
{ |
|
struct module *mod; |
|
|
|
preempt_disable(); |
|
list_for_each_entry_rcu(mod, &modules, list) { |
|
if (mod->state == MODULE_STATE_UNFORMED) |
|
continue; |
|
if (within_module(addr, mod)) { |
|
const char *sym; |
|
|
|
sym = find_kallsyms_symbol(mod, addr, size, offset); |
|
if (!sym) |
|
goto out; |
|
if (modname) |
|
strlcpy(modname, mod->name, MODULE_NAME_LEN); |
|
if (name) |
|
strlcpy(name, sym, KSYM_NAME_LEN); |
|
preempt_enable(); |
|
return 0; |
|
} |
|
} |
|
out: |
|
preempt_enable(); |
|
return -ERANGE; |
|
} |
|
|
|
int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type, |
|
char *name, char *module_name, int *exported) |
|
{ |
|
struct module *mod; |
|
|
|
preempt_disable(); |
|
list_for_each_entry_rcu(mod, &modules, list) { |
|
struct mod_kallsyms *kallsyms; |
|
|
|
if (mod->state == MODULE_STATE_UNFORMED) |
|
continue; |
|
kallsyms = rcu_dereference_sched(mod->kallsyms); |
|
if (symnum < kallsyms->num_symtab) { |
|
const Elf_Sym *sym = &kallsyms->symtab[symnum]; |
|
|
|
*value = kallsyms_symbol_value(sym); |
|
*type = kallsyms->typetab[symnum]; |
|
strlcpy(name, kallsyms_symbol_name(kallsyms, symnum), KSYM_NAME_LEN); |
|
strlcpy(module_name, mod->name, MODULE_NAME_LEN); |
|
*exported = is_exported(name, *value, mod); |
|
preempt_enable(); |
|
return 0; |
|
} |
|
symnum -= kallsyms->num_symtab; |
|
} |
|
preempt_enable(); |
|
return -ERANGE; |
|
} |
|
|
|
/* Given a module and name of symbol, find and return the symbol's value */ |
|
static unsigned long find_kallsyms_symbol_value(struct module *mod, const char *name) |
|
{ |
|
unsigned int i; |
|
struct mod_kallsyms *kallsyms = rcu_dereference_sched(mod->kallsyms); |
|
|
|
for (i = 0; i < kallsyms->num_symtab; i++) { |
|
const Elf_Sym *sym = &kallsyms->symtab[i]; |
|
|
|
if (strcmp(name, kallsyms_symbol_name(kallsyms, i)) == 0 && |
|
sym->st_shndx != SHN_UNDEF) |
|
return kallsyms_symbol_value(sym); |
|
} |
|
return 0; |
|
} |
|
|
|
/* Look for this name: can be of form module:name. */ |
|
unsigned long module_kallsyms_lookup_name(const char *name) |
|
{ |
|
struct module *mod; |
|
char *colon; |
|
unsigned long ret = 0; |
|
|
|
/* Don't lock: we're in enough trouble already. */ |
|
preempt_disable(); |
|
if ((colon = strnchr(name, MODULE_NAME_LEN, ':')) != NULL) { |
|
if ((mod = find_module_all(name, colon - name, false)) != NULL) |
|
ret = find_kallsyms_symbol_value(mod, colon+1); |
|
} else { |
|
list_for_each_entry_rcu(mod, &modules, list) { |
|
if (mod->state == MODULE_STATE_UNFORMED) |
|
continue; |
|
if ((ret = find_kallsyms_symbol_value(mod, name)) != 0) |
|
break; |
|
} |
|
} |
|
preempt_enable(); |
|
return ret; |
|
} |
|
|
|
#ifdef CONFIG_LIVEPATCH |
|
int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *, |
|
struct module *, unsigned long), |
|
void *data) |
|
{ |
|
struct module *mod; |
|
unsigned int i; |
|
int ret = 0; |
|
|
|
mutex_lock(&module_mutex); |
|
list_for_each_entry(mod, &modules, list) { |
|
/* We hold module_mutex: no need for rcu_dereference_sched */ |
|
struct mod_kallsyms *kallsyms = mod->kallsyms; |
|
|
|
if (mod->state == MODULE_STATE_UNFORMED) |
|
continue; |
|
for (i = 0; i < kallsyms->num_symtab; i++) { |
|
const Elf_Sym *sym = &kallsyms->symtab[i]; |
|
|
|
if (sym->st_shndx == SHN_UNDEF) |
|
continue; |
|
|
|
ret = fn(data, kallsyms_symbol_name(kallsyms, i), |
|
mod, kallsyms_symbol_value(sym)); |
|
if (ret != 0) |
|
goto out; |
|
} |
|
} |
|
out: |
|
mutex_unlock(&module_mutex); |
|
return ret; |
|
} |
|
#endif /* CONFIG_LIVEPATCH */ |
|
#endif /* CONFIG_KALLSYMS */ |
|
|
|
static void cfi_init(struct module *mod) |
|
{ |
|
#ifdef CONFIG_CFI_CLANG |
|
initcall_t *init; |
|
exitcall_t *exit; |
|
|
|
rcu_read_lock_sched(); |
|
mod->cfi_check = (cfi_check_fn) |
|
find_kallsyms_symbol_value(mod, "__cfi_check"); |
|
init = (initcall_t *) |
|
find_kallsyms_symbol_value(mod, "__cfi_jt_init_module"); |
|
exit = (exitcall_t *) |
|
find_kallsyms_symbol_value(mod, "__cfi_jt_cleanup_module"); |
|
rcu_read_unlock_sched(); |
|
|
|
/* Fix init/exit functions to point to the CFI jump table */ |
|
if (init) |
|
mod->init = *init; |
|
#ifdef CONFIG_MODULE_UNLOAD |
|
if (exit) |
|
mod->exit = *exit; |
|
#endif |
|
|
|
cfi_module_add(mod, module_addr_min); |
|
#endif |
|
} |
|
|
|
static void cfi_cleanup(struct module *mod) |
|
{ |
|
#ifdef CONFIG_CFI_CLANG |
|
cfi_module_remove(mod, module_addr_min); |
|
#endif |
|
} |
|
|
|
/* Maximum number of characters written by module_flags() */ |
|
#define MODULE_FLAGS_BUF_SIZE (TAINT_FLAGS_COUNT + 4) |
|
|
|
/* Keep in sync with MODULE_FLAGS_BUF_SIZE !!! */ |
|
static char *module_flags(struct module *mod, char *buf) |
|
{ |
|
int bx = 0; |
|
|
|
BUG_ON(mod->state == MODULE_STATE_UNFORMED); |
|
if (mod->taints || |
|
mod->state == MODULE_STATE_GOING || |
|
mod->state == MODULE_STATE_COMING) { |
|
buf[bx++] = '('; |
|
bx += module_flags_taint(mod, buf + bx); |
|
/* Show a - for module-is-being-unloaded */ |
|
if (mod->state == MODULE_STATE_GOING) |
|
buf[bx++] = '-'; |
|
/* Show a + for module-is-being-loaded */ |
|
if (mod->state == MODULE_STATE_COMING) |
|
buf[bx++] = '+'; |
|
buf[bx++] = ')'; |
|
} |
|
buf[bx] = '\0'; |
|
|
|
return buf; |
|
} |
|
|
|
#ifdef CONFIG_PROC_FS |
|
/* Called by the /proc file system to return a list of modules. */ |
|
static void *m_start(struct seq_file *m, loff_t *pos) |
|
{ |
|
mutex_lock(&module_mutex); |
|
return seq_list_start(&modules, *pos); |
|
} |
|
|
|
static void *m_next(struct seq_file *m, void *p, loff_t *pos) |
|
{ |
|
return seq_list_next(p, &modules, pos); |
|
} |
|
|
|
static void m_stop(struct seq_file *m, void *p) |
|
{ |
|
mutex_unlock(&module_mutex); |
|
} |
|
|
|
static int m_show(struct seq_file *m, void *p) |
|
{ |
|
struct module *mod = list_entry(p, struct module, list); |
|
char buf[MODULE_FLAGS_BUF_SIZE]; |
|
void *value; |
|
|
|
/* We always ignore unformed modules. */ |
|
if (mod->state == MODULE_STATE_UNFORMED) |
|
return 0; |
|
|
|
seq_printf(m, "%s %u", |
|
mod->name, mod->init_layout.size + mod->core_layout.size); |
|
print_unload_info(m, mod); |
|
|
|
/* Informative for users. */ |
|
seq_printf(m, " %s", |
|
mod->state == MODULE_STATE_GOING ? "Unloading" : |
|
mod->state == MODULE_STATE_COMING ? "Loading" : |
|
"Live"); |
|
/* Used by oprofile and other similar tools. */ |
|
value = m->private ? NULL : mod->core_layout.base; |
|
seq_printf(m, " 0x%px", value); |
|
|
|
/* Taints info */ |
|
if (mod->taints) |
|
seq_printf(m, " %s", module_flags(mod, buf)); |
|
|
|
seq_puts(m, "\n"); |
|
return 0; |
|
} |
|
|
|
/* |
|
* Format: modulename size refcount deps address |
|
* |
|
* Where refcount is a number or -, and deps is a comma-separated list |
|
* of depends or -. |
|
*/ |
|
static const struct seq_operations modules_op = { |
|
.start = m_start, |
|
.next = m_next, |
|
.stop = m_stop, |
|
.show = m_show |
|
}; |
|
|
|
/* |
|
* This also sets the "private" pointer to non-NULL if the |
|
* kernel pointers should be hidden (so you can just test |
|
* "m->private" to see if you should keep the values private). |
|
* |
|
* We use the same logic as for /proc/kallsyms. |
|
*/ |
|
static int modules_open(struct inode *inode, struct file *file) |
|
{ |
|
int err = seq_open(file, &modules_op); |
|
|
|
if (!err) { |
|
struct seq_file *m = file->private_data; |
|
m->private = kallsyms_show_value(file->f_cred) ? NULL : (void *)8ul; |
|
} |
|
|
|
return err; |
|
} |
|
|
|
static const struct proc_ops modules_proc_ops = { |
|
.proc_flags = PROC_ENTRY_PERMANENT, |
|
.proc_open = modules_open, |
|
.proc_read = seq_read, |
|
.proc_lseek = seq_lseek, |
|
.proc_release = seq_release, |
|
}; |
|
|
|
static int __init proc_modules_init(void) |
|
{ |
|
proc_create("modules", 0, NULL, &modules_proc_ops); |
|
return 0; |
|
} |
|
module_init(proc_modules_init); |
|
#endif |
|
|
|
/* Given an address, look for it in the module exception tables. */ |
|
const struct exception_table_entry *search_module_extables(unsigned long addr) |
|
{ |
|
const struct exception_table_entry *e = NULL; |
|
struct module *mod; |
|
|
|
preempt_disable(); |
|
mod = __module_address(addr); |
|
if (!mod) |
|
goto out; |
|
|
|
if (!mod->num_exentries) |
|
goto out; |
|
|
|
e = search_extable(mod->extable, |
|
mod->num_exentries, |
|
addr); |
|
out: |
|
preempt_enable(); |
|
|
|
/* |
|
* Now, if we found one, we are running inside it now, hence |
|
* we cannot unload the module, hence no refcnt needed. |
|
*/ |
|
return e; |
|
} |
|
|
|
/** |
|
* is_module_address() - is this address inside a module? |
|
* @addr: the address to check. |
|
* |
|
* See is_module_text_address() if you simply want to see if the address |
|
* is code (not data). |
|
*/ |
|
bool is_module_address(unsigned long addr) |
|
{ |
|
bool ret; |
|
|
|
preempt_disable(); |
|
ret = __module_address(addr) != NULL; |
|
preempt_enable(); |
|
|
|
return ret; |
|
} |
|
|
|
/** |
|
* __module_address() - get the module which contains an address. |
|
* @addr: the address. |
|
* |
|
* Must be called with preempt disabled or module mutex held so that |
|
* module doesn't get freed during this. |
|
*/ |
|
struct module *__module_address(unsigned long addr) |
|
{ |
|
struct module *mod; |
|
|
|
if (addr < module_addr_min || addr > module_addr_max) |
|
return NULL; |
|
|
|
module_assert_mutex_or_preempt(); |
|
|
|
mod = mod_find(addr); |
|
if (mod) { |
|
BUG_ON(!within_module(addr, mod)); |
|
if (mod->state == MODULE_STATE_UNFORMED) |
|
mod = NULL; |
|
} |
|
return mod; |
|
} |
|
|
|
/** |
|
* is_module_text_address() - is this address inside module code? |
|
* @addr: the address to check. |
|
* |
|
* See is_module_address() if you simply want to see if the address is |
|
* anywhere in a module. See kernel_text_address() for testing if an |
|
* address corresponds to kernel or module code. |
|
*/ |
|
bool is_module_text_address(unsigned long addr) |
|
{ |
|
bool ret; |
|
|
|
preempt_disable(); |
|
ret = __module_text_address(addr) != NULL; |
|
preempt_enable(); |
|
|
|
return ret; |
|
} |
|
|
|
/** |
|
* __module_text_address() - get the module whose code contains an address. |
|
* @addr: the address. |
|
* |
|
* Must be called with preempt disabled or module mutex held so that |
|
* module doesn't get freed during this. |
|
*/ |
|
struct module *__module_text_address(unsigned long addr) |
|
{ |
|
struct module *mod = __module_address(addr); |
|
if (mod) { |
|
/* Make sure it's within the text section. */ |
|
if (!within(addr, mod->init_layout.base, mod->init_layout.text_size) |
|
&& !within(addr, mod->core_layout.base, mod->core_layout.text_size)) |
|
mod = NULL; |
|
} |
|
return mod; |
|
} |
|
|
|
/* Don't grab lock, we're oopsing. */ |
|
void print_modules(void) |
|
{ |
|
struct module *mod; |
|
char buf[MODULE_FLAGS_BUF_SIZE]; |
|
|
|
printk(KERN_DEFAULT "Modules linked in:"); |
|
/* Most callers should already have preempt disabled, but make sure */ |
|
preempt_disable(); |
|
list_for_each_entry_rcu(mod, &modules, list) { |
|
if (mod->state == MODULE_STATE_UNFORMED) |
|
continue; |
|
pr_cont(" %s%s", mod->name, module_flags(mod, buf)); |
|
} |
|
preempt_enable(); |
|
if (last_unloaded_module[0]) |
|
pr_cont(" [last unloaded: %s]", last_unloaded_module); |
|
pr_cont("\n"); |
|
} |
|
|
|
#ifdef CONFIG_MODVERSIONS |
|
/* |
|
* Generate the signature for all relevant module structures here. |
|
* If these change, we don't want to try to parse the module. |
|
*/ |
|
void module_layout(struct module *mod, |
|
struct modversion_info *ver, |
|
struct kernel_param *kp, |
|
struct kernel_symbol *ks, |
|
struct tracepoint * const *tp) |
|
{ |
|
} |
|
EXPORT_SYMBOL(module_layout); |
|
#endif
|
|
|