forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
521 lines
16 KiB
521 lines
16 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
|
#ifndef __MM_KASAN_KASAN_H |
|
#define __MM_KASAN_KASAN_H |
|
|
|
#include <linux/kasan.h> |
|
#include <linux/kasan-tags.h> |
|
#include <linux/kfence.h> |
|
#include <linux/stackdepot.h> |
|
|
|
#ifdef CONFIG_KASAN_HW_TAGS |
|
|
|
#include <linux/static_key.h> |
|
#include "../slab.h" |
|
|
|
DECLARE_STATIC_KEY_FALSE(kasan_flag_stacktrace); |
|
extern bool kasan_flag_async __ro_after_init; |
|
|
|
static inline bool kasan_stack_collection_enabled(void) |
|
{ |
|
return static_branch_unlikely(&kasan_flag_stacktrace); |
|
} |
|
|
|
static inline bool kasan_async_mode_enabled(void) |
|
{ |
|
return kasan_flag_async; |
|
} |
|
#else |
|
|
|
static inline bool kasan_stack_collection_enabled(void) |
|
{ |
|
return true; |
|
} |
|
|
|
static inline bool kasan_async_mode_enabled(void) |
|
{ |
|
return false; |
|
} |
|
|
|
#endif |
|
|
|
extern bool kasan_flag_async __ro_after_init; |
|
|
|
#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS) |
|
#define KASAN_GRANULE_SIZE (1UL << KASAN_SHADOW_SCALE_SHIFT) |
|
#else |
|
#include <asm/mte-kasan.h> |
|
#define KASAN_GRANULE_SIZE MTE_GRANULE_SIZE |
|
#endif |
|
|
|
#define KASAN_GRANULE_MASK (KASAN_GRANULE_SIZE - 1) |
|
|
|
#define KASAN_MEMORY_PER_SHADOW_PAGE (KASAN_GRANULE_SIZE << PAGE_SHIFT) |
|
|
|
#ifdef CONFIG_KASAN_GENERIC |
|
#define KASAN_FREE_PAGE 0xFF /* page was freed */ |
|
#define KASAN_PAGE_REDZONE 0xFE /* redzone for kmalloc_large allocations */ |
|
#define KASAN_KMALLOC_REDZONE 0xFC /* redzone inside slub object */ |
|
#define KASAN_KMALLOC_FREE 0xFB /* object was freed (kmem_cache_free/kfree) */ |
|
#define KASAN_KMALLOC_FREETRACK 0xFA /* object was freed and has free track set */ |
|
#else |
|
#define KASAN_FREE_PAGE KASAN_TAG_INVALID |
|
#define KASAN_PAGE_REDZONE KASAN_TAG_INVALID |
|
#define KASAN_KMALLOC_REDZONE KASAN_TAG_INVALID |
|
#define KASAN_KMALLOC_FREE KASAN_TAG_INVALID |
|
#define KASAN_KMALLOC_FREETRACK KASAN_TAG_INVALID |
|
#endif |
|
|
|
#define KASAN_GLOBAL_REDZONE 0xF9 /* redzone for global variable */ |
|
#define KASAN_VMALLOC_INVALID 0xF8 /* unallocated space in vmapped page */ |
|
|
|
/* |
|
* Stack redzone shadow values |
|
* (Those are compiler's ABI, don't change them) |
|
*/ |
|
#define KASAN_STACK_LEFT 0xF1 |
|
#define KASAN_STACK_MID 0xF2 |
|
#define KASAN_STACK_RIGHT 0xF3 |
|
#define KASAN_STACK_PARTIAL 0xF4 |
|
|
|
/* |
|
* alloca redzone shadow values |
|
*/ |
|
#define KASAN_ALLOCA_LEFT 0xCA |
|
#define KASAN_ALLOCA_RIGHT 0xCB |
|
|
|
#define KASAN_ALLOCA_REDZONE_SIZE 32 |
|
|
|
/* |
|
* Stack frame marker (compiler ABI). |
|
*/ |
|
#define KASAN_CURRENT_STACK_FRAME_MAGIC 0x41B58AB3 |
|
|
|
/* Don't break randconfig/all*config builds */ |
|
#ifndef KASAN_ABI_VERSION |
|
#define KASAN_ABI_VERSION 1 |
|
#endif |
|
|
|
/* Metadata layout customization. */ |
|
#define META_BYTES_PER_BLOCK 1 |
|
#define META_BLOCKS_PER_ROW 16 |
|
#define META_BYTES_PER_ROW (META_BLOCKS_PER_ROW * META_BYTES_PER_BLOCK) |
|
#define META_MEM_BYTES_PER_ROW (META_BYTES_PER_ROW * KASAN_GRANULE_SIZE) |
|
#define META_ROWS_AROUND_ADDR 2 |
|
|
|
struct kasan_access_info { |
|
const void *access_addr; |
|
const void *first_bad_addr; |
|
size_t access_size; |
|
bool is_write; |
|
unsigned long ip; |
|
}; |
|
|
|
/* The layout of struct dictated by compiler */ |
|
struct kasan_source_location { |
|
const char *filename; |
|
int line_no; |
|
int column_no; |
|
}; |
|
|
|
/* The layout of struct dictated by compiler */ |
|
struct kasan_global { |
|
const void *beg; /* Address of the beginning of the global variable. */ |
|
size_t size; /* Size of the global variable. */ |
|
size_t size_with_redzone; /* Size of the variable + size of the red zone. 32 bytes aligned */ |
|
const void *name; |
|
const void *module_name; /* Name of the module where the global variable is declared. */ |
|
unsigned long has_dynamic_init; /* This needed for C++ */ |
|
#if KASAN_ABI_VERSION >= 4 |
|
struct kasan_source_location *location; |
|
#endif |
|
#if KASAN_ABI_VERSION >= 5 |
|
char *odr_indicator; |
|
#endif |
|
}; |
|
|
|
/** |
|
* Structures to keep alloc and free tracks * |
|
*/ |
|
|
|
#define KASAN_STACK_DEPTH 64 |
|
|
|
struct kasan_track { |
|
u32 pid; |
|
depot_stack_handle_t stack; |
|
}; |
|
|
|
#if defined(CONFIG_KASAN_TAGS_IDENTIFY) && defined(CONFIG_KASAN_SW_TAGS) |
|
#define KASAN_NR_FREE_STACKS 5 |
|
#else |
|
#define KASAN_NR_FREE_STACKS 1 |
|
#endif |
|
|
|
struct kasan_alloc_meta { |
|
struct kasan_track alloc_track; |
|
#ifdef CONFIG_KASAN_GENERIC |
|
/* |
|
* The auxiliary stack is stored into struct kasan_alloc_meta. |
|
* The free stack is stored into struct kasan_free_meta. |
|
*/ |
|
depot_stack_handle_t aux_stack[2]; |
|
#else |
|
struct kasan_track free_track[KASAN_NR_FREE_STACKS]; |
|
#endif |
|
#ifdef CONFIG_KASAN_TAGS_IDENTIFY |
|
u8 free_pointer_tag[KASAN_NR_FREE_STACKS]; |
|
u8 free_track_idx; |
|
#endif |
|
}; |
|
|
|
struct qlist_node { |
|
struct qlist_node *next; |
|
}; |
|
|
|
/* |
|
* Generic mode either stores free meta in the object itself or in the redzone |
|
* after the object. In the former case free meta offset is 0, in the latter |
|
* case it has some sane value smaller than INT_MAX. Use INT_MAX as free meta |
|
* offset when free meta isn't present. |
|
*/ |
|
#define KASAN_NO_FREE_META INT_MAX |
|
|
|
struct kasan_free_meta { |
|
#ifdef CONFIG_KASAN_GENERIC |
|
/* This field is used while the object is in the quarantine. |
|
* Otherwise it might be used for the allocator freelist. |
|
*/ |
|
struct qlist_node quarantine_link; |
|
struct kasan_track free_track; |
|
#endif |
|
}; |
|
|
|
struct kasan_alloc_meta *kasan_get_alloc_meta(struct kmem_cache *cache, |
|
const void *object); |
|
#ifdef CONFIG_KASAN_GENERIC |
|
struct kasan_free_meta *kasan_get_free_meta(struct kmem_cache *cache, |
|
const void *object); |
|
#endif |
|
|
|
#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS) |
|
|
|
static inline const void *kasan_shadow_to_mem(const void *shadow_addr) |
|
{ |
|
return (void *)(((unsigned long)shadow_addr - KASAN_SHADOW_OFFSET) |
|
<< KASAN_SHADOW_SCALE_SHIFT); |
|
} |
|
|
|
static inline bool addr_has_metadata(const void *addr) |
|
{ |
|
return (addr >= kasan_shadow_to_mem((void *)KASAN_SHADOW_START)); |
|
} |
|
|
|
/** |
|
* kasan_check_range - Check memory region, and report if invalid access. |
|
* @addr: the accessed address |
|
* @size: the accessed size |
|
* @write: true if access is a write access |
|
* @ret_ip: return address |
|
* @return: true if access was valid, false if invalid |
|
*/ |
|
bool kasan_check_range(unsigned long addr, size_t size, bool write, |
|
unsigned long ret_ip); |
|
|
|
#else /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */ |
|
|
|
static inline bool addr_has_metadata(const void *addr) |
|
{ |
|
return (is_vmalloc_addr(addr) || virt_addr_valid(addr)); |
|
} |
|
|
|
#endif /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */ |
|
|
|
#if defined(CONFIG_KASAN_SW_TAGS) || defined(CONFIG_KASAN_HW_TAGS) |
|
void kasan_print_tags(u8 addr_tag, const void *addr); |
|
#else |
|
static inline void kasan_print_tags(u8 addr_tag, const void *addr) { } |
|
#endif |
|
|
|
void *kasan_find_first_bad_addr(void *addr, size_t size); |
|
const char *kasan_get_bug_type(struct kasan_access_info *info); |
|
void kasan_metadata_fetch_row(char *buffer, void *row); |
|
|
|
#if defined(CONFIG_KASAN_GENERIC) && defined(CONFIG_KASAN_STACK) |
|
void kasan_print_address_stack_frame(const void *addr); |
|
#else |
|
static inline void kasan_print_address_stack_frame(const void *addr) { } |
|
#endif |
|
|
|
bool kasan_report(unsigned long addr, size_t size, |
|
bool is_write, unsigned long ip); |
|
void kasan_report_invalid_free(void *object, unsigned long ip); |
|
|
|
struct page *kasan_addr_to_page(const void *addr); |
|
|
|
depot_stack_handle_t kasan_save_stack(gfp_t flags); |
|
void kasan_set_track(struct kasan_track *track, gfp_t flags); |
|
void kasan_set_free_info(struct kmem_cache *cache, void *object, u8 tag); |
|
struct kasan_track *kasan_get_free_track(struct kmem_cache *cache, |
|
void *object, u8 tag); |
|
|
|
#if defined(CONFIG_KASAN_GENERIC) && \ |
|
(defined(CONFIG_SLAB) || defined(CONFIG_SLUB)) |
|
bool kasan_quarantine_put(struct kmem_cache *cache, void *object); |
|
void kasan_quarantine_reduce(void); |
|
void kasan_quarantine_remove_cache(struct kmem_cache *cache); |
|
#else |
|
static inline bool kasan_quarantine_put(struct kmem_cache *cache, void *object) { return false; } |
|
static inline void kasan_quarantine_reduce(void) { } |
|
static inline void kasan_quarantine_remove_cache(struct kmem_cache *cache) { } |
|
#endif |
|
|
|
#ifndef arch_kasan_set_tag |
|
static inline const void *arch_kasan_set_tag(const void *addr, u8 tag) |
|
{ |
|
return addr; |
|
} |
|
#endif |
|
#ifndef arch_kasan_get_tag |
|
#define arch_kasan_get_tag(addr) 0 |
|
#endif |
|
|
|
#define set_tag(addr, tag) ((void *)arch_kasan_set_tag((addr), (tag))) |
|
#define get_tag(addr) arch_kasan_get_tag(addr) |
|
|
|
#ifdef CONFIG_KASAN_HW_TAGS |
|
|
|
#ifndef arch_enable_tagging_sync |
|
#define arch_enable_tagging_sync() |
|
#endif |
|
#ifndef arch_enable_tagging_async |
|
#define arch_enable_tagging_async() |
|
#endif |
|
#ifndef arch_force_async_tag_fault |
|
#define arch_force_async_tag_fault() |
|
#endif |
|
#ifndef arch_get_random_tag |
|
#define arch_get_random_tag() (0xFF) |
|
#endif |
|
#ifndef arch_get_mem_tag |
|
#define arch_get_mem_tag(addr) (0xFF) |
|
#endif |
|
#ifndef arch_set_mem_tag_range |
|
#define arch_set_mem_tag_range(addr, size, tag, init) ((void *)(addr)) |
|
#endif |
|
|
|
#define hw_enable_tagging_sync() arch_enable_tagging_sync() |
|
#define hw_enable_tagging_async() arch_enable_tagging_async() |
|
#define hw_force_async_tag_fault() arch_force_async_tag_fault() |
|
#define hw_get_random_tag() arch_get_random_tag() |
|
#define hw_get_mem_tag(addr) arch_get_mem_tag(addr) |
|
#define hw_set_mem_tag_range(addr, size, tag, init) \ |
|
arch_set_mem_tag_range((addr), (size), (tag), (init)) |
|
|
|
#else /* CONFIG_KASAN_HW_TAGS */ |
|
|
|
#define hw_enable_tagging_sync() |
|
#define hw_enable_tagging_async() |
|
|
|
#endif /* CONFIG_KASAN_HW_TAGS */ |
|
|
|
#if defined(CONFIG_KASAN_HW_TAGS) && IS_ENABLED(CONFIG_KASAN_KUNIT_TEST) |
|
|
|
void kasan_enable_tagging_sync(void); |
|
void kasan_force_async_fault(void); |
|
|
|
#else /* CONFIG_KASAN_HW_TAGS || CONFIG_KASAN_KUNIT_TEST */ |
|
|
|
static inline void kasan_enable_tagging_sync(void) { } |
|
static inline void kasan_force_async_fault(void) { } |
|
|
|
#endif /* CONFIG_KASAN_HW_TAGS || CONFIG_KASAN_KUNIT_TEST */ |
|
|
|
#ifdef CONFIG_KASAN_SW_TAGS |
|
u8 kasan_random_tag(void); |
|
#elif defined(CONFIG_KASAN_HW_TAGS) |
|
static inline u8 kasan_random_tag(void) { return hw_get_random_tag(); } |
|
#else |
|
static inline u8 kasan_random_tag(void) { return 0; } |
|
#endif |
|
|
|
#ifdef CONFIG_KASAN_HW_TAGS |
|
|
|
static inline void kasan_poison(const void *addr, size_t size, u8 value, bool init) |
|
{ |
|
addr = kasan_reset_tag(addr); |
|
|
|
/* Skip KFENCE memory if called explicitly outside of sl*b. */ |
|
if (is_kfence_address(addr)) |
|
return; |
|
|
|
if (WARN_ON((unsigned long)addr & KASAN_GRANULE_MASK)) |
|
return; |
|
if (WARN_ON(size & KASAN_GRANULE_MASK)) |
|
return; |
|
|
|
hw_set_mem_tag_range((void *)addr, size, value, init); |
|
} |
|
|
|
static inline void kasan_unpoison(const void *addr, size_t size, bool init) |
|
{ |
|
u8 tag = get_tag(addr); |
|
|
|
addr = kasan_reset_tag(addr); |
|
|
|
/* Skip KFENCE memory if called explicitly outside of sl*b. */ |
|
if (is_kfence_address(addr)) |
|
return; |
|
|
|
if (WARN_ON((unsigned long)addr & KASAN_GRANULE_MASK)) |
|
return; |
|
/* |
|
* Explicitly initialize the memory with the precise object size to |
|
* avoid overwriting the SLAB redzone. This disables initialization in |
|
* the arch code and may thus lead to performance penalty. The penalty |
|
* is accepted since SLAB redzones aren't enabled in production builds. |
|
*/ |
|
if (__slub_debug_enabled() && |
|
init && ((unsigned long)size & KASAN_GRANULE_MASK)) { |
|
init = false; |
|
memzero_explicit((void *)addr, size); |
|
} |
|
size = round_up(size, KASAN_GRANULE_SIZE); |
|
|
|
hw_set_mem_tag_range((void *)addr, size, tag, init); |
|
} |
|
|
|
static inline bool kasan_byte_accessible(const void *addr) |
|
{ |
|
u8 ptr_tag = get_tag(addr); |
|
u8 mem_tag = hw_get_mem_tag((void *)addr); |
|
|
|
return ptr_tag == KASAN_TAG_KERNEL || ptr_tag == mem_tag; |
|
} |
|
|
|
#else /* CONFIG_KASAN_HW_TAGS */ |
|
|
|
/** |
|
* kasan_poison - mark the memory range as inaccessible |
|
* @addr - range start address, must be aligned to KASAN_GRANULE_SIZE |
|
* @size - range size, must be aligned to KASAN_GRANULE_SIZE |
|
* @value - value that's written to metadata for the range |
|
* @init - whether to initialize the memory range (only for hardware tag-based) |
|
* |
|
* The size gets aligned to KASAN_GRANULE_SIZE before marking the range. |
|
*/ |
|
void kasan_poison(const void *addr, size_t size, u8 value, bool init); |
|
|
|
/** |
|
* kasan_unpoison - mark the memory range as accessible |
|
* @addr - range start address, must be aligned to KASAN_GRANULE_SIZE |
|
* @size - range size, can be unaligned |
|
* @init - whether to initialize the memory range (only for hardware tag-based) |
|
* |
|
* For the tag-based modes, the @size gets aligned to KASAN_GRANULE_SIZE before |
|
* marking the range. |
|
* For the generic mode, the last granule of the memory range gets partially |
|
* unpoisoned based on the @size. |
|
*/ |
|
void kasan_unpoison(const void *addr, size_t size, bool init); |
|
|
|
bool kasan_byte_accessible(const void *addr); |
|
|
|
#endif /* CONFIG_KASAN_HW_TAGS */ |
|
|
|
#ifdef CONFIG_KASAN_GENERIC |
|
|
|
/** |
|
* kasan_poison_last_granule - mark the last granule of the memory range as |
|
* inaccessible |
|
* @addr - range start address, must be aligned to KASAN_GRANULE_SIZE |
|
* @size - range size |
|
* |
|
* This function is only available for the generic mode, as it's the only mode |
|
* that has partially poisoned memory granules. |
|
*/ |
|
void kasan_poison_last_granule(const void *address, size_t size); |
|
|
|
#else /* CONFIG_KASAN_GENERIC */ |
|
|
|
static inline void kasan_poison_last_granule(const void *address, size_t size) { } |
|
|
|
#endif /* CONFIG_KASAN_GENERIC */ |
|
|
|
#ifndef kasan_arch_is_ready |
|
static inline bool kasan_arch_is_ready(void) { return true; } |
|
#elif !defined(CONFIG_KASAN_GENERIC) || !defined(CONFIG_KASAN_OUTLINE) |
|
#error kasan_arch_is_ready only works in KASAN generic outline mode! |
|
#endif |
|
|
|
/* |
|
* Exported functions for interfaces called from assembly or from generated |
|
* code. Declarations here to avoid warning about missing declarations. |
|
*/ |
|
asmlinkage void kasan_unpoison_task_stack_below(const void *watermark); |
|
void __asan_register_globals(struct kasan_global *globals, size_t size); |
|
void __asan_unregister_globals(struct kasan_global *globals, size_t size); |
|
void __asan_handle_no_return(void); |
|
void __asan_alloca_poison(unsigned long addr, size_t size); |
|
void __asan_allocas_unpoison(const void *stack_top, const void *stack_bottom); |
|
|
|
void __asan_load1(unsigned long addr); |
|
void __asan_store1(unsigned long addr); |
|
void __asan_load2(unsigned long addr); |
|
void __asan_store2(unsigned long addr); |
|
void __asan_load4(unsigned long addr); |
|
void __asan_store4(unsigned long addr); |
|
void __asan_load8(unsigned long addr); |
|
void __asan_store8(unsigned long addr); |
|
void __asan_load16(unsigned long addr); |
|
void __asan_store16(unsigned long addr); |
|
void __asan_loadN(unsigned long addr, size_t size); |
|
void __asan_storeN(unsigned long addr, size_t size); |
|
|
|
void __asan_load1_noabort(unsigned long addr); |
|
void __asan_store1_noabort(unsigned long addr); |
|
void __asan_load2_noabort(unsigned long addr); |
|
void __asan_store2_noabort(unsigned long addr); |
|
void __asan_load4_noabort(unsigned long addr); |
|
void __asan_store4_noabort(unsigned long addr); |
|
void __asan_load8_noabort(unsigned long addr); |
|
void __asan_store8_noabort(unsigned long addr); |
|
void __asan_load16_noabort(unsigned long addr); |
|
void __asan_store16_noabort(unsigned long addr); |
|
void __asan_loadN_noabort(unsigned long addr, size_t size); |
|
void __asan_storeN_noabort(unsigned long addr, size_t size); |
|
|
|
void __asan_report_load1_noabort(unsigned long addr); |
|
void __asan_report_store1_noabort(unsigned long addr); |
|
void __asan_report_load2_noabort(unsigned long addr); |
|
void __asan_report_store2_noabort(unsigned long addr); |
|
void __asan_report_load4_noabort(unsigned long addr); |
|
void __asan_report_store4_noabort(unsigned long addr); |
|
void __asan_report_load8_noabort(unsigned long addr); |
|
void __asan_report_store8_noabort(unsigned long addr); |
|
void __asan_report_load16_noabort(unsigned long addr); |
|
void __asan_report_store16_noabort(unsigned long addr); |
|
void __asan_report_load_n_noabort(unsigned long addr, size_t size); |
|
void __asan_report_store_n_noabort(unsigned long addr, size_t size); |
|
|
|
void __asan_set_shadow_00(const void *addr, size_t size); |
|
void __asan_set_shadow_f1(const void *addr, size_t size); |
|
void __asan_set_shadow_f2(const void *addr, size_t size); |
|
void __asan_set_shadow_f3(const void *addr, size_t size); |
|
void __asan_set_shadow_f5(const void *addr, size_t size); |
|
void __asan_set_shadow_f8(const void *addr, size_t size); |
|
|
|
void __hwasan_load1_noabort(unsigned long addr); |
|
void __hwasan_store1_noabort(unsigned long addr); |
|
void __hwasan_load2_noabort(unsigned long addr); |
|
void __hwasan_store2_noabort(unsigned long addr); |
|
void __hwasan_load4_noabort(unsigned long addr); |
|
void __hwasan_store4_noabort(unsigned long addr); |
|
void __hwasan_load8_noabort(unsigned long addr); |
|
void __hwasan_store8_noabort(unsigned long addr); |
|
void __hwasan_load16_noabort(unsigned long addr); |
|
void __hwasan_store16_noabort(unsigned long addr); |
|
void __hwasan_loadN_noabort(unsigned long addr, size_t size); |
|
void __hwasan_storeN_noabort(unsigned long addr, size_t size); |
|
|
|
void __hwasan_tag_memory(unsigned long addr, u8 tag, unsigned long size); |
|
|
|
#endif
|
|
|