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1657 lines
43 KiB
1657 lines
43 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* binfmt_elf_fdpic.c: FDPIC ELF binary format |
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* |
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* Copyright (C) 2003, 2004, 2006 Red Hat, Inc. All Rights Reserved. |
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* Written by David Howells ([email protected]) |
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* Derived from binfmt_elf.c |
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*/ |
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|
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#include <linux/module.h> |
|
|
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#include <linux/fs.h> |
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#include <linux/stat.h> |
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#include <linux/sched.h> |
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#include <linux/sched/coredump.h> |
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#include <linux/sched/task_stack.h> |
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#include <linux/sched/cputime.h> |
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#include <linux/mm.h> |
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#include <linux/mman.h> |
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#include <linux/errno.h> |
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#include <linux/signal.h> |
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#include <linux/binfmts.h> |
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#include <linux/string.h> |
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#include <linux/file.h> |
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#include <linux/fcntl.h> |
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#include <linux/slab.h> |
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#include <linux/pagemap.h> |
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#include <linux/security.h> |
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#include <linux/highmem.h> |
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#include <linux/highuid.h> |
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#include <linux/personality.h> |
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#include <linux/ptrace.h> |
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#include <linux/init.h> |
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#include <linux/elf.h> |
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#include <linux/elf-fdpic.h> |
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#include <linux/elfcore.h> |
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#include <linux/coredump.h> |
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#include <linux/dax.h> |
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#include <linux/regset.h> |
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|
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#include <linux/uaccess.h> |
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#include <asm/param.h> |
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|
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typedef char *elf_caddr_t; |
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|
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#if 0 |
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#define kdebug(fmt, ...) printk("FDPIC "fmt"\n" ,##__VA_ARGS__ ) |
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#else |
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#define kdebug(fmt, ...) do {} while(0) |
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#endif |
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|
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#if 0 |
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#define kdcore(fmt, ...) printk("FDPIC "fmt"\n" ,##__VA_ARGS__ ) |
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#else |
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#define kdcore(fmt, ...) do {} while(0) |
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#endif |
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MODULE_LICENSE("GPL"); |
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static int load_elf_fdpic_binary(struct linux_binprm *); |
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static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *, struct file *); |
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static int elf_fdpic_map_file(struct elf_fdpic_params *, struct file *, |
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struct mm_struct *, const char *); |
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|
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static int create_elf_fdpic_tables(struct linux_binprm *, struct mm_struct *, |
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struct elf_fdpic_params *, |
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struct elf_fdpic_params *); |
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|
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#ifndef CONFIG_MMU |
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static int elf_fdpic_map_file_constdisp_on_uclinux(struct elf_fdpic_params *, |
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struct file *, |
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struct mm_struct *); |
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#endif |
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|
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static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *, |
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struct file *, struct mm_struct *); |
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|
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#ifdef CONFIG_ELF_CORE |
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static int elf_fdpic_core_dump(struct coredump_params *cprm); |
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#endif |
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|
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static struct linux_binfmt elf_fdpic_format = { |
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.module = THIS_MODULE, |
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.load_binary = load_elf_fdpic_binary, |
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#ifdef CONFIG_ELF_CORE |
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.core_dump = elf_fdpic_core_dump, |
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.min_coredump = ELF_EXEC_PAGESIZE, |
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#endif |
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}; |
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|
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static int __init init_elf_fdpic_binfmt(void) |
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{ |
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register_binfmt(&elf_fdpic_format); |
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return 0; |
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} |
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|
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static void __exit exit_elf_fdpic_binfmt(void) |
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{ |
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unregister_binfmt(&elf_fdpic_format); |
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} |
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|
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core_initcall(init_elf_fdpic_binfmt); |
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module_exit(exit_elf_fdpic_binfmt); |
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static int is_elf(struct elfhdr *hdr, struct file *file) |
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{ |
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if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0) |
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return 0; |
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if (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN) |
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return 0; |
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if (!elf_check_arch(hdr)) |
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return 0; |
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if (!file->f_op->mmap) |
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return 0; |
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return 1; |
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} |
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|
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#ifndef elf_check_fdpic |
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#define elf_check_fdpic(x) 0 |
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#endif |
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|
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#ifndef elf_check_const_displacement |
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#define elf_check_const_displacement(x) 0 |
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#endif |
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static int is_constdisp(struct elfhdr *hdr) |
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{ |
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if (!elf_check_fdpic(hdr)) |
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return 1; |
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if (elf_check_const_displacement(hdr)) |
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return 1; |
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return 0; |
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} |
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|
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/*****************************************************************************/ |
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/* |
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* read the program headers table into memory |
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*/ |
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static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *params, |
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struct file *file) |
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{ |
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struct elf32_phdr *phdr; |
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unsigned long size; |
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int retval, loop; |
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loff_t pos = params->hdr.e_phoff; |
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|
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if (params->hdr.e_phentsize != sizeof(struct elf_phdr)) |
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return -ENOMEM; |
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if (params->hdr.e_phnum > 65536U / sizeof(struct elf_phdr)) |
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return -ENOMEM; |
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|
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size = params->hdr.e_phnum * sizeof(struct elf_phdr); |
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params->phdrs = kmalloc(size, GFP_KERNEL); |
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if (!params->phdrs) |
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return -ENOMEM; |
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|
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retval = kernel_read(file, params->phdrs, size, &pos); |
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if (unlikely(retval != size)) |
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return retval < 0 ? retval : -ENOEXEC; |
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|
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/* determine stack size for this binary */ |
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phdr = params->phdrs; |
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for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { |
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if (phdr->p_type != PT_GNU_STACK) |
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continue; |
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|
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if (phdr->p_flags & PF_X) |
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params->flags |= ELF_FDPIC_FLAG_EXEC_STACK; |
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else |
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params->flags |= ELF_FDPIC_FLAG_NOEXEC_STACK; |
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|
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params->stack_size = phdr->p_memsz; |
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break; |
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} |
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|
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return 0; |
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} |
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|
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/*****************************************************************************/ |
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/* |
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* load an fdpic binary into various bits of memory |
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*/ |
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static int load_elf_fdpic_binary(struct linux_binprm *bprm) |
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{ |
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struct elf_fdpic_params exec_params, interp_params; |
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struct pt_regs *regs = current_pt_regs(); |
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struct elf_phdr *phdr; |
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unsigned long stack_size, entryaddr; |
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#ifdef ELF_FDPIC_PLAT_INIT |
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unsigned long dynaddr; |
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#endif |
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#ifndef CONFIG_MMU |
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unsigned long stack_prot; |
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#endif |
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struct file *interpreter = NULL; /* to shut gcc up */ |
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char *interpreter_name = NULL; |
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int executable_stack; |
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int retval, i; |
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loff_t pos; |
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|
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kdebug("____ LOAD %d ____", current->pid); |
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|
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memset(&exec_params, 0, sizeof(exec_params)); |
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memset(&interp_params, 0, sizeof(interp_params)); |
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|
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exec_params.hdr = *(struct elfhdr *) bprm->buf; |
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exec_params.flags = ELF_FDPIC_FLAG_PRESENT | ELF_FDPIC_FLAG_EXECUTABLE; |
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|
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/* check that this is a binary we know how to deal with */ |
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retval = -ENOEXEC; |
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if (!is_elf(&exec_params.hdr, bprm->file)) |
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goto error; |
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if (!elf_check_fdpic(&exec_params.hdr)) { |
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#ifdef CONFIG_MMU |
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/* binfmt_elf handles non-fdpic elf except on nommu */ |
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goto error; |
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#else |
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/* nommu can only load ET_DYN (PIE) ELF */ |
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if (exec_params.hdr.e_type != ET_DYN) |
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goto error; |
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#endif |
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} |
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|
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/* read the program header table */ |
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retval = elf_fdpic_fetch_phdrs(&exec_params, bprm->file); |
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if (retval < 0) |
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goto error; |
|
|
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/* scan for a program header that specifies an interpreter */ |
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phdr = exec_params.phdrs; |
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|
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for (i = 0; i < exec_params.hdr.e_phnum; i++, phdr++) { |
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switch (phdr->p_type) { |
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case PT_INTERP: |
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retval = -ENOMEM; |
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if (phdr->p_filesz > PATH_MAX) |
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goto error; |
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retval = -ENOENT; |
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if (phdr->p_filesz < 2) |
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goto error; |
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|
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/* read the name of the interpreter into memory */ |
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interpreter_name = kmalloc(phdr->p_filesz, GFP_KERNEL); |
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if (!interpreter_name) |
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goto error; |
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|
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pos = phdr->p_offset; |
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retval = kernel_read(bprm->file, interpreter_name, |
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phdr->p_filesz, &pos); |
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if (unlikely(retval != phdr->p_filesz)) { |
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if (retval >= 0) |
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retval = -ENOEXEC; |
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goto error; |
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} |
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|
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retval = -ENOENT; |
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if (interpreter_name[phdr->p_filesz - 1] != '\0') |
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goto error; |
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kdebug("Using ELF interpreter %s", interpreter_name); |
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|
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/* replace the program with the interpreter */ |
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interpreter = open_exec(interpreter_name); |
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retval = PTR_ERR(interpreter); |
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if (IS_ERR(interpreter)) { |
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interpreter = NULL; |
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goto error; |
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} |
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|
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/* |
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* If the binary is not readable then enforce |
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* mm->dumpable = 0 regardless of the interpreter's |
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* permissions. |
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*/ |
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would_dump(bprm, interpreter); |
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|
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pos = 0; |
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retval = kernel_read(interpreter, bprm->buf, |
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BINPRM_BUF_SIZE, &pos); |
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if (unlikely(retval != BINPRM_BUF_SIZE)) { |
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if (retval >= 0) |
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retval = -ENOEXEC; |
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goto error; |
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} |
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|
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interp_params.hdr = *((struct elfhdr *) bprm->buf); |
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break; |
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|
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case PT_LOAD: |
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#ifdef CONFIG_MMU |
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if (exec_params.load_addr == 0) |
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exec_params.load_addr = phdr->p_vaddr; |
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#endif |
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break; |
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} |
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|
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} |
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if (is_constdisp(&exec_params.hdr)) |
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exec_params.flags |= ELF_FDPIC_FLAG_CONSTDISP; |
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|
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/* perform insanity checks on the interpreter */ |
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if (interpreter_name) { |
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retval = -ELIBBAD; |
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if (!is_elf(&interp_params.hdr, interpreter)) |
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goto error; |
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interp_params.flags = ELF_FDPIC_FLAG_PRESENT; |
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|
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/* read the interpreter's program header table */ |
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retval = elf_fdpic_fetch_phdrs(&interp_params, interpreter); |
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if (retval < 0) |
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goto error; |
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} |
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|
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stack_size = exec_params.stack_size; |
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if (exec_params.flags & ELF_FDPIC_FLAG_EXEC_STACK) |
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executable_stack = EXSTACK_ENABLE_X; |
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else if (exec_params.flags & ELF_FDPIC_FLAG_NOEXEC_STACK) |
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executable_stack = EXSTACK_DISABLE_X; |
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else |
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executable_stack = EXSTACK_DEFAULT; |
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|
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if (stack_size == 0) { |
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stack_size = interp_params.stack_size; |
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if (interp_params.flags & ELF_FDPIC_FLAG_EXEC_STACK) |
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executable_stack = EXSTACK_ENABLE_X; |
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else if (interp_params.flags & ELF_FDPIC_FLAG_NOEXEC_STACK) |
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executable_stack = EXSTACK_DISABLE_X; |
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else |
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executable_stack = EXSTACK_DEFAULT; |
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} |
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retval = -ENOEXEC; |
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if (stack_size == 0) |
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stack_size = 131072UL; /* same as exec.c's default commit */ |
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|
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if (is_constdisp(&interp_params.hdr)) |
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interp_params.flags |= ELF_FDPIC_FLAG_CONSTDISP; |
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|
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/* flush all traces of the currently running executable */ |
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retval = begin_new_exec(bprm); |
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if (retval) |
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goto error; |
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|
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/* there's now no turning back... the old userspace image is dead, |
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* defunct, deceased, etc. |
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*/ |
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if (elf_check_fdpic(&exec_params.hdr)) |
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set_personality(PER_LINUX_FDPIC); |
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else |
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set_personality(PER_LINUX); |
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if (elf_read_implies_exec(&exec_params.hdr, executable_stack)) |
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current->personality |= READ_IMPLIES_EXEC; |
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|
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setup_new_exec(bprm); |
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|
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set_binfmt(&elf_fdpic_format); |
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|
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current->mm->start_code = 0; |
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current->mm->end_code = 0; |
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current->mm->start_stack = 0; |
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current->mm->start_data = 0; |
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current->mm->end_data = 0; |
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current->mm->context.exec_fdpic_loadmap = 0; |
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current->mm->context.interp_fdpic_loadmap = 0; |
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|
|
#ifdef CONFIG_MMU |
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elf_fdpic_arch_lay_out_mm(&exec_params, |
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&interp_params, |
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¤t->mm->start_stack, |
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¤t->mm->start_brk); |
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|
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retval = setup_arg_pages(bprm, current->mm->start_stack, |
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executable_stack); |
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if (retval < 0) |
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goto error; |
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#ifdef ARCH_HAS_SETUP_ADDITIONAL_PAGES |
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retval = arch_setup_additional_pages(bprm, !!interpreter_name); |
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if (retval < 0) |
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goto error; |
|
#endif |
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#endif |
|
|
|
/* load the executable and interpreter into memory */ |
|
retval = elf_fdpic_map_file(&exec_params, bprm->file, current->mm, |
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"executable"); |
|
if (retval < 0) |
|
goto error; |
|
|
|
if (interpreter_name) { |
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retval = elf_fdpic_map_file(&interp_params, interpreter, |
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current->mm, "interpreter"); |
|
if (retval < 0) { |
|
printk(KERN_ERR "Unable to load interpreter\n"); |
|
goto error; |
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} |
|
|
|
allow_write_access(interpreter); |
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fput(interpreter); |
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interpreter = NULL; |
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} |
|
|
|
#ifdef CONFIG_MMU |
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if (!current->mm->start_brk) |
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current->mm->start_brk = current->mm->end_data; |
|
|
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current->mm->brk = current->mm->start_brk = |
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PAGE_ALIGN(current->mm->start_brk); |
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|
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#else |
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/* create a stack area and zero-size brk area */ |
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stack_size = (stack_size + PAGE_SIZE - 1) & PAGE_MASK; |
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if (stack_size < PAGE_SIZE * 2) |
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stack_size = PAGE_SIZE * 2; |
|
|
|
stack_prot = PROT_READ | PROT_WRITE; |
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if (executable_stack == EXSTACK_ENABLE_X || |
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(executable_stack == EXSTACK_DEFAULT && VM_STACK_FLAGS & VM_EXEC)) |
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stack_prot |= PROT_EXEC; |
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|
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current->mm->start_brk = vm_mmap(NULL, 0, stack_size, stack_prot, |
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MAP_PRIVATE | MAP_ANONYMOUS | |
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MAP_UNINITIALIZED | MAP_GROWSDOWN, |
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0); |
|
|
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if (IS_ERR_VALUE(current->mm->start_brk)) { |
|
retval = current->mm->start_brk; |
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current->mm->start_brk = 0; |
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goto error; |
|
} |
|
|
|
current->mm->brk = current->mm->start_brk; |
|
current->mm->context.end_brk = current->mm->start_brk; |
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current->mm->start_stack = current->mm->start_brk + stack_size; |
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#endif |
|
|
|
if (create_elf_fdpic_tables(bprm, current->mm, |
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&exec_params, &interp_params) < 0) |
|
goto error; |
|
|
|
kdebug("- start_code %lx", current->mm->start_code); |
|
kdebug("- end_code %lx", current->mm->end_code); |
|
kdebug("- start_data %lx", current->mm->start_data); |
|
kdebug("- end_data %lx", current->mm->end_data); |
|
kdebug("- start_brk %lx", current->mm->start_brk); |
|
kdebug("- brk %lx", current->mm->brk); |
|
kdebug("- start_stack %lx", current->mm->start_stack); |
|
|
|
#ifdef ELF_FDPIC_PLAT_INIT |
|
/* |
|
* The ABI may specify that certain registers be set up in special |
|
* ways (on i386 %edx is the address of a DT_FINI function, for |
|
* example. This macro performs whatever initialization to |
|
* the regs structure is required. |
|
*/ |
|
dynaddr = interp_params.dynamic_addr ?: exec_params.dynamic_addr; |
|
ELF_FDPIC_PLAT_INIT(regs, exec_params.map_addr, interp_params.map_addr, |
|
dynaddr); |
|
#endif |
|
|
|
finalize_exec(bprm); |
|
/* everything is now ready... get the userspace context ready to roll */ |
|
entryaddr = interp_params.entry_addr ?: exec_params.entry_addr; |
|
start_thread(regs, entryaddr, current->mm->start_stack); |
|
|
|
retval = 0; |
|
|
|
error: |
|
if (interpreter) { |
|
allow_write_access(interpreter); |
|
fput(interpreter); |
|
} |
|
kfree(interpreter_name); |
|
kfree(exec_params.phdrs); |
|
kfree(exec_params.loadmap); |
|
kfree(interp_params.phdrs); |
|
kfree(interp_params.loadmap); |
|
return retval; |
|
} |
|
|
|
/*****************************************************************************/ |
|
|
|
#ifndef ELF_BASE_PLATFORM |
|
/* |
|
* AT_BASE_PLATFORM indicates the "real" hardware/microarchitecture. |
|
* If the arch defines ELF_BASE_PLATFORM (in asm/elf.h), the value |
|
* will be copied to the user stack in the same manner as AT_PLATFORM. |
|
*/ |
|
#define ELF_BASE_PLATFORM NULL |
|
#endif |
|
|
|
/* |
|
* present useful information to the program by shovelling it onto the new |
|
* process's stack |
|
*/ |
|
static int create_elf_fdpic_tables(struct linux_binprm *bprm, |
|
struct mm_struct *mm, |
|
struct elf_fdpic_params *exec_params, |
|
struct elf_fdpic_params *interp_params) |
|
{ |
|
const struct cred *cred = current_cred(); |
|
unsigned long sp, csp, nitems; |
|
elf_caddr_t __user *argv, *envp; |
|
size_t platform_len = 0, len; |
|
char *k_platform, *k_base_platform; |
|
char __user *u_platform, *u_base_platform, *p; |
|
int loop; |
|
int nr; /* reset for each csp adjustment */ |
|
unsigned long flags = 0; |
|
|
|
#ifdef CONFIG_MMU |
|
/* In some cases (e.g. Hyper-Threading), we want to avoid L1 evictions |
|
* by the processes running on the same package. One thing we can do is |
|
* to shuffle the initial stack for them, so we give the architecture |
|
* an opportunity to do so here. |
|
*/ |
|
sp = arch_align_stack(bprm->p); |
|
#else |
|
sp = mm->start_stack; |
|
|
|
/* stack the program arguments and environment */ |
|
if (transfer_args_to_stack(bprm, &sp) < 0) |
|
return -EFAULT; |
|
sp &= ~15; |
|
#endif |
|
|
|
/* |
|
* If this architecture has a platform capability string, copy it |
|
* to userspace. In some cases (Sparc), this info is impossible |
|
* for userspace to get any other way, in others (i386) it is |
|
* merely difficult. |
|
*/ |
|
k_platform = ELF_PLATFORM; |
|
u_platform = NULL; |
|
|
|
if (k_platform) { |
|
platform_len = strlen(k_platform) + 1; |
|
sp -= platform_len; |
|
u_platform = (char __user *) sp; |
|
if (copy_to_user(u_platform, k_platform, platform_len) != 0) |
|
return -EFAULT; |
|
} |
|
|
|
/* |
|
* If this architecture has a "base" platform capability |
|
* string, copy it to userspace. |
|
*/ |
|
k_base_platform = ELF_BASE_PLATFORM; |
|
u_base_platform = NULL; |
|
|
|
if (k_base_platform) { |
|
platform_len = strlen(k_base_platform) + 1; |
|
sp -= platform_len; |
|
u_base_platform = (char __user *) sp; |
|
if (copy_to_user(u_base_platform, k_base_platform, platform_len) != 0) |
|
return -EFAULT; |
|
} |
|
|
|
sp &= ~7UL; |
|
|
|
/* stack the load map(s) */ |
|
len = sizeof(struct elf32_fdpic_loadmap); |
|
len += sizeof(struct elf32_fdpic_loadseg) * exec_params->loadmap->nsegs; |
|
sp = (sp - len) & ~7UL; |
|
exec_params->map_addr = sp; |
|
|
|
if (copy_to_user((void __user *) sp, exec_params->loadmap, len) != 0) |
|
return -EFAULT; |
|
|
|
current->mm->context.exec_fdpic_loadmap = (unsigned long) sp; |
|
|
|
if (interp_params->loadmap) { |
|
len = sizeof(struct elf32_fdpic_loadmap); |
|
len += sizeof(struct elf32_fdpic_loadseg) * |
|
interp_params->loadmap->nsegs; |
|
sp = (sp - len) & ~7UL; |
|
interp_params->map_addr = sp; |
|
|
|
if (copy_to_user((void __user *) sp, interp_params->loadmap, |
|
len) != 0) |
|
return -EFAULT; |
|
|
|
current->mm->context.interp_fdpic_loadmap = (unsigned long) sp; |
|
} |
|
|
|
/* force 16 byte _final_ alignment here for generality */ |
|
#define DLINFO_ITEMS 15 |
|
|
|
nitems = 1 + DLINFO_ITEMS + (k_platform ? 1 : 0) + |
|
(k_base_platform ? 1 : 0) + AT_VECTOR_SIZE_ARCH; |
|
|
|
if (bprm->have_execfd) |
|
nitems++; |
|
|
|
csp = sp; |
|
sp -= nitems * 2 * sizeof(unsigned long); |
|
sp -= (bprm->envc + 1) * sizeof(char *); /* envv[] */ |
|
sp -= (bprm->argc + 1) * sizeof(char *); /* argv[] */ |
|
sp -= 1 * sizeof(unsigned long); /* argc */ |
|
|
|
csp -= sp & 15UL; |
|
sp -= sp & 15UL; |
|
|
|
/* put the ELF interpreter info on the stack */ |
|
#define NEW_AUX_ENT(id, val) \ |
|
do { \ |
|
struct { unsigned long _id, _val; } __user *ent, v; \ |
|
\ |
|
ent = (void __user *) csp; \ |
|
v._id = (id); \ |
|
v._val = (val); \ |
|
if (copy_to_user(ent + nr, &v, sizeof(v))) \ |
|
return -EFAULT; \ |
|
nr++; \ |
|
} while (0) |
|
|
|
nr = 0; |
|
csp -= 2 * sizeof(unsigned long); |
|
NEW_AUX_ENT(AT_NULL, 0); |
|
if (k_platform) { |
|
nr = 0; |
|
csp -= 2 * sizeof(unsigned long); |
|
NEW_AUX_ENT(AT_PLATFORM, |
|
(elf_addr_t) (unsigned long) u_platform); |
|
} |
|
|
|
if (k_base_platform) { |
|
nr = 0; |
|
csp -= 2 * sizeof(unsigned long); |
|
NEW_AUX_ENT(AT_BASE_PLATFORM, |
|
(elf_addr_t) (unsigned long) u_base_platform); |
|
} |
|
|
|
if (bprm->have_execfd) { |
|
nr = 0; |
|
csp -= 2 * sizeof(unsigned long); |
|
NEW_AUX_ENT(AT_EXECFD, bprm->execfd); |
|
} |
|
|
|
nr = 0; |
|
csp -= DLINFO_ITEMS * 2 * sizeof(unsigned long); |
|
NEW_AUX_ENT(AT_HWCAP, ELF_HWCAP); |
|
#ifdef ELF_HWCAP2 |
|
NEW_AUX_ENT(AT_HWCAP2, ELF_HWCAP2); |
|
#endif |
|
NEW_AUX_ENT(AT_PAGESZ, PAGE_SIZE); |
|
NEW_AUX_ENT(AT_CLKTCK, CLOCKS_PER_SEC); |
|
NEW_AUX_ENT(AT_PHDR, exec_params->ph_addr); |
|
NEW_AUX_ENT(AT_PHENT, sizeof(struct elf_phdr)); |
|
NEW_AUX_ENT(AT_PHNUM, exec_params->hdr.e_phnum); |
|
NEW_AUX_ENT(AT_BASE, interp_params->elfhdr_addr); |
|
if (bprm->interp_flags & BINPRM_FLAGS_PRESERVE_ARGV0) |
|
flags |= AT_FLAGS_PRESERVE_ARGV0; |
|
NEW_AUX_ENT(AT_FLAGS, flags); |
|
NEW_AUX_ENT(AT_ENTRY, exec_params->entry_addr); |
|
NEW_AUX_ENT(AT_UID, (elf_addr_t) from_kuid_munged(cred->user_ns, cred->uid)); |
|
NEW_AUX_ENT(AT_EUID, (elf_addr_t) from_kuid_munged(cred->user_ns, cred->euid)); |
|
NEW_AUX_ENT(AT_GID, (elf_addr_t) from_kgid_munged(cred->user_ns, cred->gid)); |
|
NEW_AUX_ENT(AT_EGID, (elf_addr_t) from_kgid_munged(cred->user_ns, cred->egid)); |
|
NEW_AUX_ENT(AT_SECURE, bprm->secureexec); |
|
NEW_AUX_ENT(AT_EXECFN, bprm->exec); |
|
|
|
#ifdef ARCH_DLINFO |
|
nr = 0; |
|
csp -= AT_VECTOR_SIZE_ARCH * 2 * sizeof(unsigned long); |
|
|
|
/* ARCH_DLINFO must come last so platform specific code can enforce |
|
* special alignment requirements on the AUXV if necessary (eg. PPC). |
|
*/ |
|
ARCH_DLINFO; |
|
#endif |
|
#undef NEW_AUX_ENT |
|
|
|
/* allocate room for argv[] and envv[] */ |
|
csp -= (bprm->envc + 1) * sizeof(elf_caddr_t); |
|
envp = (elf_caddr_t __user *) csp; |
|
csp -= (bprm->argc + 1) * sizeof(elf_caddr_t); |
|
argv = (elf_caddr_t __user *) csp; |
|
|
|
/* stack argc */ |
|
csp -= sizeof(unsigned long); |
|
if (put_user(bprm->argc, (unsigned long __user *) csp)) |
|
return -EFAULT; |
|
|
|
BUG_ON(csp != sp); |
|
|
|
/* fill in the argv[] array */ |
|
#ifdef CONFIG_MMU |
|
current->mm->arg_start = bprm->p; |
|
#else |
|
current->mm->arg_start = current->mm->start_stack - |
|
(MAX_ARG_PAGES * PAGE_SIZE - bprm->p); |
|
#endif |
|
|
|
p = (char __user *) current->mm->arg_start; |
|
for (loop = bprm->argc; loop > 0; loop--) { |
|
if (put_user((elf_caddr_t) p, argv++)) |
|
return -EFAULT; |
|
len = strnlen_user(p, MAX_ARG_STRLEN); |
|
if (!len || len > MAX_ARG_STRLEN) |
|
return -EINVAL; |
|
p += len; |
|
} |
|
if (put_user(NULL, argv)) |
|
return -EFAULT; |
|
current->mm->arg_end = (unsigned long) p; |
|
|
|
/* fill in the envv[] array */ |
|
current->mm->env_start = (unsigned long) p; |
|
for (loop = bprm->envc; loop > 0; loop--) { |
|
if (put_user((elf_caddr_t)(unsigned long) p, envp++)) |
|
return -EFAULT; |
|
len = strnlen_user(p, MAX_ARG_STRLEN); |
|
if (!len || len > MAX_ARG_STRLEN) |
|
return -EINVAL; |
|
p += len; |
|
} |
|
if (put_user(NULL, envp)) |
|
return -EFAULT; |
|
current->mm->env_end = (unsigned long) p; |
|
|
|
mm->start_stack = (unsigned long) sp; |
|
return 0; |
|
} |
|
|
|
/*****************************************************************************/ |
|
/* |
|
* load the appropriate binary image (executable or interpreter) into memory |
|
* - we assume no MMU is available |
|
* - if no other PIC bits are set in params->hdr->e_flags |
|
* - we assume that the LOADable segments in the binary are independently relocatable |
|
* - we assume R/O executable segments are shareable |
|
* - else |
|
* - we assume the loadable parts of the image to require fixed displacement |
|
* - the image is not shareable |
|
*/ |
|
static int elf_fdpic_map_file(struct elf_fdpic_params *params, |
|
struct file *file, |
|
struct mm_struct *mm, |
|
const char *what) |
|
{ |
|
struct elf32_fdpic_loadmap *loadmap; |
|
#ifdef CONFIG_MMU |
|
struct elf32_fdpic_loadseg *mseg; |
|
#endif |
|
struct elf32_fdpic_loadseg *seg; |
|
struct elf32_phdr *phdr; |
|
unsigned long load_addr, stop; |
|
unsigned nloads, tmp; |
|
size_t size; |
|
int loop, ret; |
|
|
|
/* allocate a load map table */ |
|
nloads = 0; |
|
for (loop = 0; loop < params->hdr.e_phnum; loop++) |
|
if (params->phdrs[loop].p_type == PT_LOAD) |
|
nloads++; |
|
|
|
if (nloads == 0) |
|
return -ELIBBAD; |
|
|
|
size = sizeof(*loadmap) + nloads * sizeof(*seg); |
|
loadmap = kzalloc(size, GFP_KERNEL); |
|
if (!loadmap) |
|
return -ENOMEM; |
|
|
|
params->loadmap = loadmap; |
|
|
|
loadmap->version = ELF32_FDPIC_LOADMAP_VERSION; |
|
loadmap->nsegs = nloads; |
|
|
|
load_addr = params->load_addr; |
|
seg = loadmap->segs; |
|
|
|
/* map the requested LOADs into the memory space */ |
|
switch (params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) { |
|
case ELF_FDPIC_FLAG_CONSTDISP: |
|
case ELF_FDPIC_FLAG_CONTIGUOUS: |
|
#ifndef CONFIG_MMU |
|
ret = elf_fdpic_map_file_constdisp_on_uclinux(params, file, mm); |
|
if (ret < 0) |
|
return ret; |
|
break; |
|
#endif |
|
default: |
|
ret = elf_fdpic_map_file_by_direct_mmap(params, file, mm); |
|
if (ret < 0) |
|
return ret; |
|
break; |
|
} |
|
|
|
/* map the entry point */ |
|
if (params->hdr.e_entry) { |
|
seg = loadmap->segs; |
|
for (loop = loadmap->nsegs; loop > 0; loop--, seg++) { |
|
if (params->hdr.e_entry >= seg->p_vaddr && |
|
params->hdr.e_entry < seg->p_vaddr + seg->p_memsz) { |
|
params->entry_addr = |
|
(params->hdr.e_entry - seg->p_vaddr) + |
|
seg->addr; |
|
break; |
|
} |
|
} |
|
} |
|
|
|
/* determine where the program header table has wound up if mapped */ |
|
stop = params->hdr.e_phoff; |
|
stop += params->hdr.e_phnum * sizeof (struct elf_phdr); |
|
phdr = params->phdrs; |
|
|
|
for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { |
|
if (phdr->p_type != PT_LOAD) |
|
continue; |
|
|
|
if (phdr->p_offset > params->hdr.e_phoff || |
|
phdr->p_offset + phdr->p_filesz < stop) |
|
continue; |
|
|
|
seg = loadmap->segs; |
|
for (loop = loadmap->nsegs; loop > 0; loop--, seg++) { |
|
if (phdr->p_vaddr >= seg->p_vaddr && |
|
phdr->p_vaddr + phdr->p_filesz <= |
|
seg->p_vaddr + seg->p_memsz) { |
|
params->ph_addr = |
|
(phdr->p_vaddr - seg->p_vaddr) + |
|
seg->addr + |
|
params->hdr.e_phoff - phdr->p_offset; |
|
break; |
|
} |
|
} |
|
break; |
|
} |
|
|
|
/* determine where the dynamic section has wound up if there is one */ |
|
phdr = params->phdrs; |
|
for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { |
|
if (phdr->p_type != PT_DYNAMIC) |
|
continue; |
|
|
|
seg = loadmap->segs; |
|
for (loop = loadmap->nsegs; loop > 0; loop--, seg++) { |
|
if (phdr->p_vaddr >= seg->p_vaddr && |
|
phdr->p_vaddr + phdr->p_memsz <= |
|
seg->p_vaddr + seg->p_memsz) { |
|
Elf32_Dyn __user *dyn; |
|
Elf32_Sword d_tag; |
|
|
|
params->dynamic_addr = |
|
(phdr->p_vaddr - seg->p_vaddr) + |
|
seg->addr; |
|
|
|
/* check the dynamic section contains at least |
|
* one item, and that the last item is a NULL |
|
* entry */ |
|
if (phdr->p_memsz == 0 || |
|
phdr->p_memsz % sizeof(Elf32_Dyn) != 0) |
|
goto dynamic_error; |
|
|
|
tmp = phdr->p_memsz / sizeof(Elf32_Dyn); |
|
dyn = (Elf32_Dyn __user *)params->dynamic_addr; |
|
if (get_user(d_tag, &dyn[tmp - 1].d_tag) || |
|
d_tag != 0) |
|
goto dynamic_error; |
|
break; |
|
} |
|
} |
|
break; |
|
} |
|
|
|
/* now elide adjacent segments in the load map on MMU linux |
|
* - on uClinux the holes between may actually be filled with system |
|
* stuff or stuff from other processes |
|
*/ |
|
#ifdef CONFIG_MMU |
|
nloads = loadmap->nsegs; |
|
mseg = loadmap->segs; |
|
seg = mseg + 1; |
|
for (loop = 1; loop < nloads; loop++) { |
|
/* see if we have a candidate for merging */ |
|
if (seg->p_vaddr - mseg->p_vaddr == seg->addr - mseg->addr) { |
|
load_addr = PAGE_ALIGN(mseg->addr + mseg->p_memsz); |
|
if (load_addr == (seg->addr & PAGE_MASK)) { |
|
mseg->p_memsz += |
|
load_addr - |
|
(mseg->addr + mseg->p_memsz); |
|
mseg->p_memsz += seg->addr & ~PAGE_MASK; |
|
mseg->p_memsz += seg->p_memsz; |
|
loadmap->nsegs--; |
|
continue; |
|
} |
|
} |
|
|
|
mseg++; |
|
if (mseg != seg) |
|
*mseg = *seg; |
|
} |
|
#endif |
|
|
|
kdebug("Mapped Object [%s]:", what); |
|
kdebug("- elfhdr : %lx", params->elfhdr_addr); |
|
kdebug("- entry : %lx", params->entry_addr); |
|
kdebug("- PHDR[] : %lx", params->ph_addr); |
|
kdebug("- DYNAMIC[]: %lx", params->dynamic_addr); |
|
seg = loadmap->segs; |
|
for (loop = 0; loop < loadmap->nsegs; loop++, seg++) |
|
kdebug("- LOAD[%d] : %08x-%08x [va=%x ms=%x]", |
|
loop, |
|
seg->addr, seg->addr + seg->p_memsz - 1, |
|
seg->p_vaddr, seg->p_memsz); |
|
|
|
return 0; |
|
|
|
dynamic_error: |
|
printk("ELF FDPIC %s with invalid DYNAMIC section (inode=%lu)\n", |
|
what, file_inode(file)->i_ino); |
|
return -ELIBBAD; |
|
} |
|
|
|
/*****************************************************************************/ |
|
/* |
|
* map a file with constant displacement under uClinux |
|
*/ |
|
#ifndef CONFIG_MMU |
|
static int elf_fdpic_map_file_constdisp_on_uclinux( |
|
struct elf_fdpic_params *params, |
|
struct file *file, |
|
struct mm_struct *mm) |
|
{ |
|
struct elf32_fdpic_loadseg *seg; |
|
struct elf32_phdr *phdr; |
|
unsigned long load_addr, base = ULONG_MAX, top = 0, maddr = 0; |
|
int loop, ret; |
|
|
|
load_addr = params->load_addr; |
|
seg = params->loadmap->segs; |
|
|
|
/* determine the bounds of the contiguous overall allocation we must |
|
* make */ |
|
phdr = params->phdrs; |
|
for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { |
|
if (params->phdrs[loop].p_type != PT_LOAD) |
|
continue; |
|
|
|
if (base > phdr->p_vaddr) |
|
base = phdr->p_vaddr; |
|
if (top < phdr->p_vaddr + phdr->p_memsz) |
|
top = phdr->p_vaddr + phdr->p_memsz; |
|
} |
|
|
|
/* allocate one big anon block for everything */ |
|
maddr = vm_mmap(NULL, load_addr, top - base, |
|
PROT_READ | PROT_WRITE | PROT_EXEC, MAP_PRIVATE, 0); |
|
if (IS_ERR_VALUE(maddr)) |
|
return (int) maddr; |
|
|
|
if (load_addr != 0) |
|
load_addr += PAGE_ALIGN(top - base); |
|
|
|
/* and then load the file segments into it */ |
|
phdr = params->phdrs; |
|
for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { |
|
if (params->phdrs[loop].p_type != PT_LOAD) |
|
continue; |
|
|
|
seg->addr = maddr + (phdr->p_vaddr - base); |
|
seg->p_vaddr = phdr->p_vaddr; |
|
seg->p_memsz = phdr->p_memsz; |
|
|
|
ret = read_code(file, seg->addr, phdr->p_offset, |
|
phdr->p_filesz); |
|
if (ret < 0) |
|
return ret; |
|
|
|
/* map the ELF header address if in this segment */ |
|
if (phdr->p_offset == 0) |
|
params->elfhdr_addr = seg->addr; |
|
|
|
/* clear any space allocated but not loaded */ |
|
if (phdr->p_filesz < phdr->p_memsz) { |
|
if (clear_user((void *) (seg->addr + phdr->p_filesz), |
|
phdr->p_memsz - phdr->p_filesz)) |
|
return -EFAULT; |
|
} |
|
|
|
if (mm) { |
|
if (phdr->p_flags & PF_X) { |
|
if (!mm->start_code) { |
|
mm->start_code = seg->addr; |
|
mm->end_code = seg->addr + |
|
phdr->p_memsz; |
|
} |
|
} else if (!mm->start_data) { |
|
mm->start_data = seg->addr; |
|
mm->end_data = seg->addr + phdr->p_memsz; |
|
} |
|
} |
|
|
|
seg++; |
|
} |
|
|
|
return 0; |
|
} |
|
#endif |
|
|
|
/*****************************************************************************/ |
|
/* |
|
* map a binary by direct mmap() of the individual PT_LOAD segments |
|
*/ |
|
static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *params, |
|
struct file *file, |
|
struct mm_struct *mm) |
|
{ |
|
struct elf32_fdpic_loadseg *seg; |
|
struct elf32_phdr *phdr; |
|
unsigned long load_addr, delta_vaddr; |
|
int loop, dvset; |
|
|
|
load_addr = params->load_addr; |
|
delta_vaddr = 0; |
|
dvset = 0; |
|
|
|
seg = params->loadmap->segs; |
|
|
|
/* deal with each load segment separately */ |
|
phdr = params->phdrs; |
|
for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { |
|
unsigned long maddr, disp, excess, excess1; |
|
int prot = 0, flags; |
|
|
|
if (phdr->p_type != PT_LOAD) |
|
continue; |
|
|
|
kdebug("[LOAD] va=%lx of=%lx fs=%lx ms=%lx", |
|
(unsigned long) phdr->p_vaddr, |
|
(unsigned long) phdr->p_offset, |
|
(unsigned long) phdr->p_filesz, |
|
(unsigned long) phdr->p_memsz); |
|
|
|
/* determine the mapping parameters */ |
|
if (phdr->p_flags & PF_R) prot |= PROT_READ; |
|
if (phdr->p_flags & PF_W) prot |= PROT_WRITE; |
|
if (phdr->p_flags & PF_X) prot |= PROT_EXEC; |
|
|
|
flags = MAP_PRIVATE; |
|
maddr = 0; |
|
|
|
switch (params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) { |
|
case ELF_FDPIC_FLAG_INDEPENDENT: |
|
/* PT_LOADs are independently locatable */ |
|
break; |
|
|
|
case ELF_FDPIC_FLAG_HONOURVADDR: |
|
/* the specified virtual address must be honoured */ |
|
maddr = phdr->p_vaddr; |
|
flags |= MAP_FIXED; |
|
break; |
|
|
|
case ELF_FDPIC_FLAG_CONSTDISP: |
|
/* constant displacement |
|
* - can be mapped anywhere, but must be mapped as a |
|
* unit |
|
*/ |
|
if (!dvset) { |
|
maddr = load_addr; |
|
delta_vaddr = phdr->p_vaddr; |
|
dvset = 1; |
|
} else { |
|
maddr = load_addr + phdr->p_vaddr - delta_vaddr; |
|
flags |= MAP_FIXED; |
|
} |
|
break; |
|
|
|
case ELF_FDPIC_FLAG_CONTIGUOUS: |
|
/* contiguity handled later */ |
|
break; |
|
|
|
default: |
|
BUG(); |
|
} |
|
|
|
maddr &= PAGE_MASK; |
|
|
|
/* create the mapping */ |
|
disp = phdr->p_vaddr & ~PAGE_MASK; |
|
maddr = vm_mmap(file, maddr, phdr->p_memsz + disp, prot, flags, |
|
phdr->p_offset - disp); |
|
|
|
kdebug("mmap[%d] <file> sz=%lx pr=%x fl=%x of=%lx --> %08lx", |
|
loop, phdr->p_memsz + disp, prot, flags, |
|
phdr->p_offset - disp, maddr); |
|
|
|
if (IS_ERR_VALUE(maddr)) |
|
return (int) maddr; |
|
|
|
if ((params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) == |
|
ELF_FDPIC_FLAG_CONTIGUOUS) |
|
load_addr += PAGE_ALIGN(phdr->p_memsz + disp); |
|
|
|
seg->addr = maddr + disp; |
|
seg->p_vaddr = phdr->p_vaddr; |
|
seg->p_memsz = phdr->p_memsz; |
|
|
|
/* map the ELF header address if in this segment */ |
|
if (phdr->p_offset == 0) |
|
params->elfhdr_addr = seg->addr; |
|
|
|
/* clear the bit between beginning of mapping and beginning of |
|
* PT_LOAD */ |
|
if (prot & PROT_WRITE && disp > 0) { |
|
kdebug("clear[%d] ad=%lx sz=%lx", loop, maddr, disp); |
|
if (clear_user((void __user *) maddr, disp)) |
|
return -EFAULT; |
|
maddr += disp; |
|
} |
|
|
|
/* clear any space allocated but not loaded |
|
* - on uClinux we can just clear the lot |
|
* - on MMU linux we'll get a SIGBUS beyond the last page |
|
* extant in the file |
|
*/ |
|
excess = phdr->p_memsz - phdr->p_filesz; |
|
excess1 = PAGE_SIZE - ((maddr + phdr->p_filesz) & ~PAGE_MASK); |
|
|
|
#ifdef CONFIG_MMU |
|
if (excess > excess1) { |
|
unsigned long xaddr = maddr + phdr->p_filesz + excess1; |
|
unsigned long xmaddr; |
|
|
|
flags |= MAP_FIXED | MAP_ANONYMOUS; |
|
xmaddr = vm_mmap(NULL, xaddr, excess - excess1, |
|
prot, flags, 0); |
|
|
|
kdebug("mmap[%d] <anon>" |
|
" ad=%lx sz=%lx pr=%x fl=%x of=0 --> %08lx", |
|
loop, xaddr, excess - excess1, prot, flags, |
|
xmaddr); |
|
|
|
if (xmaddr != xaddr) |
|
return -ENOMEM; |
|
} |
|
|
|
if (prot & PROT_WRITE && excess1 > 0) { |
|
kdebug("clear[%d] ad=%lx sz=%lx", |
|
loop, maddr + phdr->p_filesz, excess1); |
|
if (clear_user((void __user *) maddr + phdr->p_filesz, |
|
excess1)) |
|
return -EFAULT; |
|
} |
|
|
|
#else |
|
if (excess > 0) { |
|
kdebug("clear[%d] ad=%lx sz=%lx", |
|
loop, maddr + phdr->p_filesz, excess); |
|
if (clear_user((void *) maddr + phdr->p_filesz, excess)) |
|
return -EFAULT; |
|
} |
|
#endif |
|
|
|
if (mm) { |
|
if (phdr->p_flags & PF_X) { |
|
if (!mm->start_code) { |
|
mm->start_code = maddr; |
|
mm->end_code = maddr + phdr->p_memsz; |
|
} |
|
} else if (!mm->start_data) { |
|
mm->start_data = maddr; |
|
mm->end_data = maddr + phdr->p_memsz; |
|
} |
|
} |
|
|
|
seg++; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
/*****************************************************************************/ |
|
/* |
|
* ELF-FDPIC core dumper |
|
* |
|
* Modelled on fs/exec.c:aout_core_dump() |
|
* Jeremy Fitzhardinge <[email protected]> |
|
* |
|
* Modelled on fs/binfmt_elf.c core dumper |
|
*/ |
|
#ifdef CONFIG_ELF_CORE |
|
|
|
struct elf_prstatus_fdpic |
|
{ |
|
struct elf_prstatus_common common; |
|
elf_gregset_t pr_reg; /* GP registers */ |
|
/* When using FDPIC, the loadmap addresses need to be communicated |
|
* to GDB in order for GDB to do the necessary relocations. The |
|
* fields (below) used to communicate this information are placed |
|
* immediately after ``pr_reg'', so that the loadmap addresses may |
|
* be viewed as part of the register set if so desired. |
|
*/ |
|
unsigned long pr_exec_fdpic_loadmap; |
|
unsigned long pr_interp_fdpic_loadmap; |
|
int pr_fpvalid; /* True if math co-processor being used. */ |
|
}; |
|
|
|
/* An ELF note in memory */ |
|
struct memelfnote |
|
{ |
|
const char *name; |
|
int type; |
|
unsigned int datasz; |
|
void *data; |
|
}; |
|
|
|
static int notesize(struct memelfnote *en) |
|
{ |
|
int sz; |
|
|
|
sz = sizeof(struct elf_note); |
|
sz += roundup(strlen(en->name) + 1, 4); |
|
sz += roundup(en->datasz, 4); |
|
|
|
return sz; |
|
} |
|
|
|
/* #define DEBUG */ |
|
|
|
static int writenote(struct memelfnote *men, struct coredump_params *cprm) |
|
{ |
|
struct elf_note en; |
|
en.n_namesz = strlen(men->name) + 1; |
|
en.n_descsz = men->datasz; |
|
en.n_type = men->type; |
|
|
|
return dump_emit(cprm, &en, sizeof(en)) && |
|
dump_emit(cprm, men->name, en.n_namesz) && dump_align(cprm, 4) && |
|
dump_emit(cprm, men->data, men->datasz) && dump_align(cprm, 4); |
|
} |
|
|
|
static inline void fill_elf_fdpic_header(struct elfhdr *elf, int segs) |
|
{ |
|
memcpy(elf->e_ident, ELFMAG, SELFMAG); |
|
elf->e_ident[EI_CLASS] = ELF_CLASS; |
|
elf->e_ident[EI_DATA] = ELF_DATA; |
|
elf->e_ident[EI_VERSION] = EV_CURRENT; |
|
elf->e_ident[EI_OSABI] = ELF_OSABI; |
|
memset(elf->e_ident+EI_PAD, 0, EI_NIDENT-EI_PAD); |
|
|
|
elf->e_type = ET_CORE; |
|
elf->e_machine = ELF_ARCH; |
|
elf->e_version = EV_CURRENT; |
|
elf->e_entry = 0; |
|
elf->e_phoff = sizeof(struct elfhdr); |
|
elf->e_shoff = 0; |
|
elf->e_flags = ELF_FDPIC_CORE_EFLAGS; |
|
elf->e_ehsize = sizeof(struct elfhdr); |
|
elf->e_phentsize = sizeof(struct elf_phdr); |
|
elf->e_phnum = segs; |
|
elf->e_shentsize = 0; |
|
elf->e_shnum = 0; |
|
elf->e_shstrndx = 0; |
|
return; |
|
} |
|
|
|
static inline void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, loff_t offset) |
|
{ |
|
phdr->p_type = PT_NOTE; |
|
phdr->p_offset = offset; |
|
phdr->p_vaddr = 0; |
|
phdr->p_paddr = 0; |
|
phdr->p_filesz = sz; |
|
phdr->p_memsz = 0; |
|
phdr->p_flags = 0; |
|
phdr->p_align = 0; |
|
return; |
|
} |
|
|
|
static inline void fill_note(struct memelfnote *note, const char *name, int type, |
|
unsigned int sz, void *data) |
|
{ |
|
note->name = name; |
|
note->type = type; |
|
note->datasz = sz; |
|
note->data = data; |
|
return; |
|
} |
|
|
|
/* |
|
* fill up all the fields in prstatus from the given task struct, except |
|
* registers which need to be filled up separately. |
|
*/ |
|
static void fill_prstatus(struct elf_prstatus_common *prstatus, |
|
struct task_struct *p, long signr) |
|
{ |
|
prstatus->pr_info.si_signo = prstatus->pr_cursig = signr; |
|
prstatus->pr_sigpend = p->pending.signal.sig[0]; |
|
prstatus->pr_sighold = p->blocked.sig[0]; |
|
rcu_read_lock(); |
|
prstatus->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent)); |
|
rcu_read_unlock(); |
|
prstatus->pr_pid = task_pid_vnr(p); |
|
prstatus->pr_pgrp = task_pgrp_vnr(p); |
|
prstatus->pr_sid = task_session_vnr(p); |
|
if (thread_group_leader(p)) { |
|
struct task_cputime cputime; |
|
|
|
/* |
|
* This is the record for the group leader. It shows the |
|
* group-wide total, not its individual thread total. |
|
*/ |
|
thread_group_cputime(p, &cputime); |
|
prstatus->pr_utime = ns_to_kernel_old_timeval(cputime.utime); |
|
prstatus->pr_stime = ns_to_kernel_old_timeval(cputime.stime); |
|
} else { |
|
u64 utime, stime; |
|
|
|
task_cputime(p, &utime, &stime); |
|
prstatus->pr_utime = ns_to_kernel_old_timeval(utime); |
|
prstatus->pr_stime = ns_to_kernel_old_timeval(stime); |
|
} |
|
prstatus->pr_cutime = ns_to_kernel_old_timeval(p->signal->cutime); |
|
prstatus->pr_cstime = ns_to_kernel_old_timeval(p->signal->cstime); |
|
} |
|
|
|
static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p, |
|
struct mm_struct *mm) |
|
{ |
|
const struct cred *cred; |
|
unsigned int i, len; |
|
unsigned int state; |
|
|
|
/* first copy the parameters from user space */ |
|
memset(psinfo, 0, sizeof(struct elf_prpsinfo)); |
|
|
|
len = mm->arg_end - mm->arg_start; |
|
if (len >= ELF_PRARGSZ) |
|
len = ELF_PRARGSZ - 1; |
|
if (copy_from_user(&psinfo->pr_psargs, |
|
(const char __user *) mm->arg_start, len)) |
|
return -EFAULT; |
|
for (i = 0; i < len; i++) |
|
if (psinfo->pr_psargs[i] == 0) |
|
psinfo->pr_psargs[i] = ' '; |
|
psinfo->pr_psargs[len] = 0; |
|
|
|
rcu_read_lock(); |
|
psinfo->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent)); |
|
rcu_read_unlock(); |
|
psinfo->pr_pid = task_pid_vnr(p); |
|
psinfo->pr_pgrp = task_pgrp_vnr(p); |
|
psinfo->pr_sid = task_session_vnr(p); |
|
|
|
state = READ_ONCE(p->__state); |
|
i = state ? ffz(~state) + 1 : 0; |
|
psinfo->pr_state = i; |
|
psinfo->pr_sname = (i > 5) ? '.' : "RSDTZW"[i]; |
|
psinfo->pr_zomb = psinfo->pr_sname == 'Z'; |
|
psinfo->pr_nice = task_nice(p); |
|
psinfo->pr_flag = p->flags; |
|
rcu_read_lock(); |
|
cred = __task_cred(p); |
|
SET_UID(psinfo->pr_uid, from_kuid_munged(cred->user_ns, cred->uid)); |
|
SET_GID(psinfo->pr_gid, from_kgid_munged(cred->user_ns, cred->gid)); |
|
rcu_read_unlock(); |
|
strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname)); |
|
|
|
return 0; |
|
} |
|
|
|
/* Here is the structure in which status of each thread is captured. */ |
|
struct elf_thread_status |
|
{ |
|
struct elf_thread_status *next; |
|
struct elf_prstatus_fdpic prstatus; /* NT_PRSTATUS */ |
|
elf_fpregset_t fpu; /* NT_PRFPREG */ |
|
struct memelfnote notes[2]; |
|
int num_notes; |
|
}; |
|
|
|
/* |
|
* In order to add the specific thread information for the elf file format, |
|
* we need to keep a linked list of every thread's pr_status and then create |
|
* a single section for them in the final core file. |
|
*/ |
|
static struct elf_thread_status *elf_dump_thread_status(long signr, struct task_struct *p, int *sz) |
|
{ |
|
const struct user_regset_view *view = task_user_regset_view(p); |
|
struct elf_thread_status *t; |
|
int i, ret; |
|
|
|
t = kzalloc(sizeof(struct elf_thread_status), GFP_KERNEL); |
|
if (!t) |
|
return t; |
|
|
|
fill_prstatus(&t->prstatus.common, p, signr); |
|
t->prstatus.pr_exec_fdpic_loadmap = p->mm->context.exec_fdpic_loadmap; |
|
t->prstatus.pr_interp_fdpic_loadmap = p->mm->context.interp_fdpic_loadmap; |
|
regset_get(p, &view->regsets[0], |
|
sizeof(t->prstatus.pr_reg), &t->prstatus.pr_reg); |
|
|
|
fill_note(&t->notes[0], "CORE", NT_PRSTATUS, sizeof(t->prstatus), |
|
&t->prstatus); |
|
t->num_notes++; |
|
*sz += notesize(&t->notes[0]); |
|
|
|
for (i = 1; i < view->n; ++i) { |
|
const struct user_regset *regset = &view->regsets[i]; |
|
if (regset->core_note_type != NT_PRFPREG) |
|
continue; |
|
if (regset->active && regset->active(p, regset) <= 0) |
|
continue; |
|
ret = regset_get(p, regset, sizeof(t->fpu), &t->fpu); |
|
if (ret >= 0) |
|
t->prstatus.pr_fpvalid = 1; |
|
break; |
|
} |
|
|
|
if (t->prstatus.pr_fpvalid) { |
|
fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(t->fpu), |
|
&t->fpu); |
|
t->num_notes++; |
|
*sz += notesize(&t->notes[1]); |
|
} |
|
return t; |
|
} |
|
|
|
static void fill_extnum_info(struct elfhdr *elf, struct elf_shdr *shdr4extnum, |
|
elf_addr_t e_shoff, int segs) |
|
{ |
|
elf->e_shoff = e_shoff; |
|
elf->e_shentsize = sizeof(*shdr4extnum); |
|
elf->e_shnum = 1; |
|
elf->e_shstrndx = SHN_UNDEF; |
|
|
|
memset(shdr4extnum, 0, sizeof(*shdr4extnum)); |
|
|
|
shdr4extnum->sh_type = SHT_NULL; |
|
shdr4extnum->sh_size = elf->e_shnum; |
|
shdr4extnum->sh_link = elf->e_shstrndx; |
|
shdr4extnum->sh_info = segs; |
|
} |
|
|
|
/* |
|
* dump the segments for an MMU process |
|
*/ |
|
static bool elf_fdpic_dump_segments(struct coredump_params *cprm, |
|
struct core_vma_metadata *vma_meta, |
|
int vma_count) |
|
{ |
|
int i; |
|
|
|
for (i = 0; i < vma_count; i++) { |
|
struct core_vma_metadata *meta = vma_meta + i; |
|
|
|
if (!dump_user_range(cprm, meta->start, meta->dump_size)) |
|
return false; |
|
} |
|
return true; |
|
} |
|
|
|
/* |
|
* Actual dumper |
|
* |
|
* This is a two-pass process; first we find the offsets of the bits, |
|
* and then they are actually written out. If we run out of core limit |
|
* we just truncate. |
|
*/ |
|
static int elf_fdpic_core_dump(struct coredump_params *cprm) |
|
{ |
|
int has_dumped = 0; |
|
int segs; |
|
int i; |
|
struct elfhdr *elf = NULL; |
|
loff_t offset = 0, dataoff; |
|
struct memelfnote psinfo_note, auxv_note; |
|
struct elf_prpsinfo *psinfo = NULL; /* NT_PRPSINFO */ |
|
struct elf_thread_status *thread_list = NULL; |
|
int thread_status_size = 0; |
|
elf_addr_t *auxv; |
|
struct elf_phdr *phdr4note = NULL; |
|
struct elf_shdr *shdr4extnum = NULL; |
|
Elf_Half e_phnum; |
|
elf_addr_t e_shoff; |
|
struct core_thread *ct; |
|
struct elf_thread_status *tmp; |
|
|
|
/* alloc memory for large data structures: too large to be on stack */ |
|
elf = kmalloc(sizeof(*elf), GFP_KERNEL); |
|
if (!elf) |
|
goto end_coredump; |
|
psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL); |
|
if (!psinfo) |
|
goto end_coredump; |
|
|
|
for (ct = current->signal->core_state->dumper.next; |
|
ct; ct = ct->next) { |
|
tmp = elf_dump_thread_status(cprm->siginfo->si_signo, |
|
ct->task, &thread_status_size); |
|
if (!tmp) |
|
goto end_coredump; |
|
|
|
tmp->next = thread_list; |
|
thread_list = tmp; |
|
} |
|
|
|
/* now collect the dump for the current */ |
|
tmp = elf_dump_thread_status(cprm->siginfo->si_signo, |
|
current, &thread_status_size); |
|
if (!tmp) |
|
goto end_coredump; |
|
tmp->next = thread_list; |
|
thread_list = tmp; |
|
|
|
segs = cprm->vma_count + elf_core_extra_phdrs(); |
|
|
|
/* for notes section */ |
|
segs++; |
|
|
|
/* If segs > PN_XNUM(0xffff), then e_phnum overflows. To avoid |
|
* this, kernel supports extended numbering. Have a look at |
|
* include/linux/elf.h for further information. */ |
|
e_phnum = segs > PN_XNUM ? PN_XNUM : segs; |
|
|
|
/* Set up header */ |
|
fill_elf_fdpic_header(elf, e_phnum); |
|
|
|
has_dumped = 1; |
|
/* |
|
* Set up the notes in similar form to SVR4 core dumps made |
|
* with info from their /proc. |
|
*/ |
|
|
|
fill_psinfo(psinfo, current->group_leader, current->mm); |
|
fill_note(&psinfo_note, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo); |
|
thread_status_size += notesize(&psinfo_note); |
|
|
|
auxv = (elf_addr_t *) current->mm->saved_auxv; |
|
i = 0; |
|
do |
|
i += 2; |
|
while (auxv[i - 2] != AT_NULL); |
|
fill_note(&auxv_note, "CORE", NT_AUXV, i * sizeof(elf_addr_t), auxv); |
|
thread_status_size += notesize(&auxv_note); |
|
|
|
offset = sizeof(*elf); /* Elf header */ |
|
offset += segs * sizeof(struct elf_phdr); /* Program headers */ |
|
|
|
/* Write notes phdr entry */ |
|
phdr4note = kmalloc(sizeof(*phdr4note), GFP_KERNEL); |
|
if (!phdr4note) |
|
goto end_coredump; |
|
|
|
fill_elf_note_phdr(phdr4note, thread_status_size, offset); |
|
offset += thread_status_size; |
|
|
|
/* Page-align dumped data */ |
|
dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE); |
|
|
|
offset += cprm->vma_data_size; |
|
offset += elf_core_extra_data_size(); |
|
e_shoff = offset; |
|
|
|
if (e_phnum == PN_XNUM) { |
|
shdr4extnum = kmalloc(sizeof(*shdr4extnum), GFP_KERNEL); |
|
if (!shdr4extnum) |
|
goto end_coredump; |
|
fill_extnum_info(elf, shdr4extnum, e_shoff, segs); |
|
} |
|
|
|
offset = dataoff; |
|
|
|
if (!dump_emit(cprm, elf, sizeof(*elf))) |
|
goto end_coredump; |
|
|
|
if (!dump_emit(cprm, phdr4note, sizeof(*phdr4note))) |
|
goto end_coredump; |
|
|
|
/* write program headers for segments dump */ |
|
for (i = 0; i < cprm->vma_count; i++) { |
|
struct core_vma_metadata *meta = cprm->vma_meta + i; |
|
struct elf_phdr phdr; |
|
size_t sz; |
|
|
|
sz = meta->end - meta->start; |
|
|
|
phdr.p_type = PT_LOAD; |
|
phdr.p_offset = offset; |
|
phdr.p_vaddr = meta->start; |
|
phdr.p_paddr = 0; |
|
phdr.p_filesz = meta->dump_size; |
|
phdr.p_memsz = sz; |
|
offset += phdr.p_filesz; |
|
phdr.p_flags = 0; |
|
if (meta->flags & VM_READ) |
|
phdr.p_flags |= PF_R; |
|
if (meta->flags & VM_WRITE) |
|
phdr.p_flags |= PF_W; |
|
if (meta->flags & VM_EXEC) |
|
phdr.p_flags |= PF_X; |
|
phdr.p_align = ELF_EXEC_PAGESIZE; |
|
|
|
if (!dump_emit(cprm, &phdr, sizeof(phdr))) |
|
goto end_coredump; |
|
} |
|
|
|
if (!elf_core_write_extra_phdrs(cprm, offset)) |
|
goto end_coredump; |
|
|
|
/* write out the notes section */ |
|
if (!writenote(thread_list->notes, cprm)) |
|
goto end_coredump; |
|
if (!writenote(&psinfo_note, cprm)) |
|
goto end_coredump; |
|
if (!writenote(&auxv_note, cprm)) |
|
goto end_coredump; |
|
for (i = 1; i < thread_list->num_notes; i++) |
|
if (!writenote(thread_list->notes + i, cprm)) |
|
goto end_coredump; |
|
|
|
/* write out the thread status notes section */ |
|
for (tmp = thread_list->next; tmp; tmp = tmp->next) { |
|
for (i = 0; i < tmp->num_notes; i++) |
|
if (!writenote(&tmp->notes[i], cprm)) |
|
goto end_coredump; |
|
} |
|
|
|
dump_skip_to(cprm, dataoff); |
|
|
|
if (!elf_fdpic_dump_segments(cprm, cprm->vma_meta, cprm->vma_count)) |
|
goto end_coredump; |
|
|
|
if (!elf_core_write_extra_data(cprm)) |
|
goto end_coredump; |
|
|
|
if (e_phnum == PN_XNUM) { |
|
if (!dump_emit(cprm, shdr4extnum, sizeof(*shdr4extnum))) |
|
goto end_coredump; |
|
} |
|
|
|
if (cprm->file->f_pos != offset) { |
|
/* Sanity check */ |
|
printk(KERN_WARNING |
|
"elf_core_dump: file->f_pos (%lld) != offset (%lld)\n", |
|
cprm->file->f_pos, offset); |
|
} |
|
|
|
end_coredump: |
|
while (thread_list) { |
|
tmp = thread_list; |
|
thread_list = thread_list->next; |
|
kfree(tmp); |
|
} |
|
kfree(phdr4note); |
|
kfree(elf); |
|
kfree(psinfo); |
|
kfree(shdr4extnum); |
|
return has_dumped; |
|
} |
|
|
|
#endif /* CONFIG_ELF_CORE */
|
|
|