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494 lines
15 KiB
494 lines
15 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef __MM_KASAN_KASAN_H |
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#define __MM_KASAN_KASAN_H |
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#include <linux/kasan.h> |
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#include <linux/kfence.h> |
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#include <linux/stackdepot.h> |
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#ifdef CONFIG_KASAN_HW_TAGS |
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#include <linux/static_key.h> |
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DECLARE_STATIC_KEY_FALSE(kasan_flag_stacktrace); |
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static inline bool kasan_stack_collection_enabled(void) |
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{ |
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return static_branch_unlikely(&kasan_flag_stacktrace); |
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} |
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#else |
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static inline bool kasan_stack_collection_enabled(void) |
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{ |
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return true; |
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} |
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#endif |
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extern bool kasan_flag_panic __ro_after_init; |
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#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS) |
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#define KASAN_GRANULE_SIZE (1UL << KASAN_SHADOW_SCALE_SHIFT) |
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#else |
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#include <asm/mte-kasan.h> |
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#define KASAN_GRANULE_SIZE MTE_GRANULE_SIZE |
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#endif |
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#define KASAN_GRANULE_MASK (KASAN_GRANULE_SIZE - 1) |
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#define KASAN_MEMORY_PER_SHADOW_PAGE (KASAN_GRANULE_SIZE << PAGE_SHIFT) |
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#define KASAN_TAG_KERNEL 0xFF /* native kernel pointers tag */ |
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#define KASAN_TAG_INVALID 0xFE /* inaccessible memory tag */ |
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#define KASAN_TAG_MAX 0xFD /* maximum value for random tags */ |
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#ifdef CONFIG_KASAN_HW_TAGS |
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#define KASAN_TAG_MIN 0xF0 /* mimimum value for random tags */ |
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#else |
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#define KASAN_TAG_MIN 0x00 /* mimimum value for random tags */ |
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#endif |
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#ifdef CONFIG_KASAN_GENERIC |
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#define KASAN_FREE_PAGE 0xFF /* page was freed */ |
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#define KASAN_PAGE_REDZONE 0xFE /* redzone for kmalloc_large allocations */ |
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#define KASAN_KMALLOC_REDZONE 0xFC /* redzone inside slub object */ |
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#define KASAN_KMALLOC_FREE 0xFB /* object was freed (kmem_cache_free/kfree) */ |
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#define KASAN_KMALLOC_FREETRACK 0xFA /* object was freed and has free track set */ |
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#else |
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#define KASAN_FREE_PAGE KASAN_TAG_INVALID |
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#define KASAN_PAGE_REDZONE KASAN_TAG_INVALID |
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#define KASAN_KMALLOC_REDZONE KASAN_TAG_INVALID |
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#define KASAN_KMALLOC_FREE KASAN_TAG_INVALID |
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#define KASAN_KMALLOC_FREETRACK KASAN_TAG_INVALID |
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#endif |
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#define KASAN_GLOBAL_REDZONE 0xF9 /* redzone for global variable */ |
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#define KASAN_VMALLOC_INVALID 0xF8 /* unallocated space in vmapped page */ |
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/* |
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* Stack redzone shadow values |
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* (Those are compiler's ABI, don't change them) |
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*/ |
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#define KASAN_STACK_LEFT 0xF1 |
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#define KASAN_STACK_MID 0xF2 |
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#define KASAN_STACK_RIGHT 0xF3 |
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#define KASAN_STACK_PARTIAL 0xF4 |
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/* |
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* alloca redzone shadow values |
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*/ |
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#define KASAN_ALLOCA_LEFT 0xCA |
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#define KASAN_ALLOCA_RIGHT 0xCB |
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#define KASAN_ALLOCA_REDZONE_SIZE 32 |
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/* |
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* Stack frame marker (compiler ABI). |
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*/ |
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#define KASAN_CURRENT_STACK_FRAME_MAGIC 0x41B58AB3 |
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/* Don't break randconfig/all*config builds */ |
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#ifndef KASAN_ABI_VERSION |
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#define KASAN_ABI_VERSION 1 |
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#endif |
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/* Metadata layout customization. */ |
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#define META_BYTES_PER_BLOCK 1 |
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#define META_BLOCKS_PER_ROW 16 |
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#define META_BYTES_PER_ROW (META_BLOCKS_PER_ROW * META_BYTES_PER_BLOCK) |
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#define META_MEM_BYTES_PER_ROW (META_BYTES_PER_ROW * KASAN_GRANULE_SIZE) |
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#define META_ROWS_AROUND_ADDR 2 |
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struct kasan_access_info { |
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const void *access_addr; |
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const void *first_bad_addr; |
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size_t access_size; |
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bool is_write; |
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unsigned long ip; |
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}; |
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/* The layout of struct dictated by compiler */ |
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struct kasan_source_location { |
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const char *filename; |
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int line_no; |
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int column_no; |
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}; |
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/* The layout of struct dictated by compiler */ |
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struct kasan_global { |
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const void *beg; /* Address of the beginning of the global variable. */ |
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size_t size; /* Size of the global variable. */ |
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size_t size_with_redzone; /* Size of the variable + size of the red zone. 32 bytes aligned */ |
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const void *name; |
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const void *module_name; /* Name of the module where the global variable is declared. */ |
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unsigned long has_dynamic_init; /* This needed for C++ */ |
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#if KASAN_ABI_VERSION >= 4 |
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struct kasan_source_location *location; |
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#endif |
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#if KASAN_ABI_VERSION >= 5 |
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char *odr_indicator; |
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#endif |
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}; |
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/** |
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* Structures to keep alloc and free tracks * |
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*/ |
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#define KASAN_STACK_DEPTH 64 |
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struct kasan_track { |
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u32 pid; |
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depot_stack_handle_t stack; |
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}; |
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#ifdef CONFIG_KASAN_SW_TAGS_IDENTIFY |
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#define KASAN_NR_FREE_STACKS 5 |
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#else |
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#define KASAN_NR_FREE_STACKS 1 |
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#endif |
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struct kasan_alloc_meta { |
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struct kasan_track alloc_track; |
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#ifdef CONFIG_KASAN_GENERIC |
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/* |
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* call_rcu() call stack is stored into struct kasan_alloc_meta. |
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* The free stack is stored into struct kasan_free_meta. |
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*/ |
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depot_stack_handle_t aux_stack[2]; |
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#else |
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struct kasan_track free_track[KASAN_NR_FREE_STACKS]; |
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#endif |
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#ifdef CONFIG_KASAN_SW_TAGS_IDENTIFY |
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u8 free_pointer_tag[KASAN_NR_FREE_STACKS]; |
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u8 free_track_idx; |
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#endif |
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}; |
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struct qlist_node { |
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struct qlist_node *next; |
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}; |
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/* |
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* Generic mode either stores free meta in the object itself or in the redzone |
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* after the object. In the former case free meta offset is 0, in the latter |
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* case it has some sane value smaller than INT_MAX. Use INT_MAX as free meta |
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* offset when free meta isn't present. |
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*/ |
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#define KASAN_NO_FREE_META INT_MAX |
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struct kasan_free_meta { |
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#ifdef CONFIG_KASAN_GENERIC |
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/* This field is used while the object is in the quarantine. |
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* Otherwise it might be used for the allocator freelist. |
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*/ |
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struct qlist_node quarantine_link; |
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struct kasan_track free_track; |
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#endif |
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}; |
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struct kasan_alloc_meta *kasan_get_alloc_meta(struct kmem_cache *cache, |
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const void *object); |
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#ifdef CONFIG_KASAN_GENERIC |
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struct kasan_free_meta *kasan_get_free_meta(struct kmem_cache *cache, |
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const void *object); |
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#endif |
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#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS) |
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static inline const void *kasan_shadow_to_mem(const void *shadow_addr) |
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{ |
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return (void *)(((unsigned long)shadow_addr - KASAN_SHADOW_OFFSET) |
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<< KASAN_SHADOW_SCALE_SHIFT); |
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} |
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static inline bool addr_has_metadata(const void *addr) |
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{ |
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return (addr >= kasan_shadow_to_mem((void *)KASAN_SHADOW_START)); |
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} |
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/** |
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* kasan_check_range - Check memory region, and report if invalid access. |
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* @addr: the accessed address |
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* @size: the accessed size |
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* @write: true if access is a write access |
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* @ret_ip: return address |
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* @return: true if access was valid, false if invalid |
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*/ |
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bool kasan_check_range(unsigned long addr, size_t size, bool write, |
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unsigned long ret_ip); |
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#else /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */ |
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static inline bool addr_has_metadata(const void *addr) |
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{ |
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return (is_vmalloc_addr(addr) || virt_addr_valid(addr)); |
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} |
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#endif /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */ |
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#if defined(CONFIG_KASAN_SW_TAGS) || defined(CONFIG_KASAN_HW_TAGS) |
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void kasan_print_tags(u8 addr_tag, const void *addr); |
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#else |
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static inline void kasan_print_tags(u8 addr_tag, const void *addr) { } |
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#endif |
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void *kasan_find_first_bad_addr(void *addr, size_t size); |
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const char *kasan_get_bug_type(struct kasan_access_info *info); |
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void kasan_metadata_fetch_row(char *buffer, void *row); |
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#if defined(CONFIG_KASAN_GENERIC) && defined(CONFIG_KASAN_STACK) |
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void kasan_print_address_stack_frame(const void *addr); |
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#else |
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static inline void kasan_print_address_stack_frame(const void *addr) { } |
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#endif |
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bool kasan_report(unsigned long addr, size_t size, |
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bool is_write, unsigned long ip); |
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void kasan_report_invalid_free(void *object, unsigned long ip); |
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struct page *kasan_addr_to_page(const void *addr); |
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depot_stack_handle_t kasan_save_stack(gfp_t flags); |
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void kasan_set_track(struct kasan_track *track, gfp_t flags); |
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void kasan_set_free_info(struct kmem_cache *cache, void *object, u8 tag); |
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struct kasan_track *kasan_get_free_track(struct kmem_cache *cache, |
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void *object, u8 tag); |
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#if defined(CONFIG_KASAN_GENERIC) && \ |
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(defined(CONFIG_SLAB) || defined(CONFIG_SLUB)) |
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bool kasan_quarantine_put(struct kmem_cache *cache, void *object); |
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void kasan_quarantine_reduce(void); |
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void kasan_quarantine_remove_cache(struct kmem_cache *cache); |
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#else |
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static inline bool kasan_quarantine_put(struct kmem_cache *cache, void *object) { return false; } |
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static inline void kasan_quarantine_reduce(void) { } |
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static inline void kasan_quarantine_remove_cache(struct kmem_cache *cache) { } |
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#endif |
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#ifndef arch_kasan_set_tag |
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static inline const void *arch_kasan_set_tag(const void *addr, u8 tag) |
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{ |
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return addr; |
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} |
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#endif |
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#ifndef arch_kasan_get_tag |
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#define arch_kasan_get_tag(addr) 0 |
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#endif |
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#define set_tag(addr, tag) ((void *)arch_kasan_set_tag((addr), (tag))) |
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#define get_tag(addr) arch_kasan_get_tag(addr) |
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#ifdef CONFIG_KASAN_HW_TAGS |
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#ifndef arch_enable_tagging |
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#define arch_enable_tagging() |
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#endif |
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#ifndef arch_init_tags |
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#define arch_init_tags(max_tag) |
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#endif |
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#ifndef arch_set_tagging_report_once |
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#define arch_set_tagging_report_once(state) |
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#endif |
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#ifndef arch_get_random_tag |
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#define arch_get_random_tag() (0xFF) |
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#endif |
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#ifndef arch_get_mem_tag |
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#define arch_get_mem_tag(addr) (0xFF) |
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#endif |
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#ifndef arch_set_mem_tag_range |
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#define arch_set_mem_tag_range(addr, size, tag) ((void *)(addr)) |
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#endif |
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#define hw_enable_tagging() arch_enable_tagging() |
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#define hw_init_tags(max_tag) arch_init_tags(max_tag) |
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#define hw_set_tagging_report_once(state) arch_set_tagging_report_once(state) |
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#define hw_get_random_tag() arch_get_random_tag() |
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#define hw_get_mem_tag(addr) arch_get_mem_tag(addr) |
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#define hw_set_mem_tag_range(addr, size, tag) arch_set_mem_tag_range((addr), (size), (tag)) |
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#else /* CONFIG_KASAN_HW_TAGS */ |
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#define hw_enable_tagging() |
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#define hw_set_tagging_report_once(state) |
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#endif /* CONFIG_KASAN_HW_TAGS */ |
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#if defined(CONFIG_KASAN_HW_TAGS) && IS_ENABLED(CONFIG_KASAN_KUNIT_TEST) |
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void kasan_set_tagging_report_once(bool state); |
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void kasan_enable_tagging(void); |
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#else /* CONFIG_KASAN_HW_TAGS || CONFIG_KASAN_KUNIT_TEST */ |
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static inline void kasan_set_tagging_report_once(bool state) { } |
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static inline void kasan_enable_tagging(void) { } |
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#endif /* CONFIG_KASAN_HW_TAGS || CONFIG_KASAN_KUNIT_TEST */ |
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#ifdef CONFIG_KASAN_SW_TAGS |
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u8 kasan_random_tag(void); |
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#elif defined(CONFIG_KASAN_HW_TAGS) |
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static inline u8 kasan_random_tag(void) { return hw_get_random_tag(); } |
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#else |
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static inline u8 kasan_random_tag(void) { return 0; } |
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#endif |
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#ifdef CONFIG_KASAN_HW_TAGS |
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static inline void kasan_poison(const void *addr, size_t size, u8 value) |
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{ |
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addr = kasan_reset_tag(addr); |
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/* Skip KFENCE memory if called explicitly outside of sl*b. */ |
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if (is_kfence_address(addr)) |
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return; |
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if (WARN_ON((unsigned long)addr & KASAN_GRANULE_MASK)) |
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return; |
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if (WARN_ON(size & KASAN_GRANULE_MASK)) |
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return; |
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hw_set_mem_tag_range((void *)addr, size, value); |
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} |
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static inline void kasan_unpoison(const void *addr, size_t size) |
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{ |
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u8 tag = get_tag(addr); |
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addr = kasan_reset_tag(addr); |
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/* Skip KFENCE memory if called explicitly outside of sl*b. */ |
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if (is_kfence_address(addr)) |
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return; |
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if (WARN_ON((unsigned long)addr & KASAN_GRANULE_MASK)) |
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return; |
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size = round_up(size, KASAN_GRANULE_SIZE); |
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hw_set_mem_tag_range((void *)addr, size, tag); |
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} |
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static inline bool kasan_byte_accessible(const void *addr) |
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{ |
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u8 ptr_tag = get_tag(addr); |
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u8 mem_tag = hw_get_mem_tag((void *)addr); |
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return (mem_tag != KASAN_TAG_INVALID) && |
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(ptr_tag == KASAN_TAG_KERNEL || ptr_tag == mem_tag); |
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} |
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#else /* CONFIG_KASAN_HW_TAGS */ |
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/** |
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* kasan_poison - mark the memory range as unaccessible |
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* @addr - range start address, must be aligned to KASAN_GRANULE_SIZE |
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* @size - range size, must be aligned to KASAN_GRANULE_SIZE |
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* @value - value that's written to metadata for the range |
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* |
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* The size gets aligned to KASAN_GRANULE_SIZE before marking the range. |
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*/ |
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void kasan_poison(const void *addr, size_t size, u8 value); |
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/** |
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* kasan_unpoison - mark the memory range as accessible |
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* @addr - range start address, must be aligned to KASAN_GRANULE_SIZE |
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* @size - range size, can be unaligned |
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* |
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* For the tag-based modes, the @size gets aligned to KASAN_GRANULE_SIZE before |
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* marking the range. |
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* For the generic mode, the last granule of the memory range gets partially |
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* unpoisoned based on the @size. |
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*/ |
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void kasan_unpoison(const void *addr, size_t size); |
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bool kasan_byte_accessible(const void *addr); |
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#endif /* CONFIG_KASAN_HW_TAGS */ |
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#ifdef CONFIG_KASAN_GENERIC |
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/** |
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* kasan_poison_last_granule - mark the last granule of the memory range as |
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* unaccessible |
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* @addr - range start address, must be aligned to KASAN_GRANULE_SIZE |
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* @size - range size |
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* |
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* This function is only available for the generic mode, as it's the only mode |
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* that has partially poisoned memory granules. |
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*/ |
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void kasan_poison_last_granule(const void *address, size_t size); |
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#else /* CONFIG_KASAN_GENERIC */ |
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static inline void kasan_poison_last_granule(const void *address, size_t size) { } |
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#endif /* CONFIG_KASAN_GENERIC */ |
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/* |
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* Exported functions for interfaces called from assembly or from generated |
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* code. Declarations here to avoid warning about missing declarations. |
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*/ |
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asmlinkage void kasan_unpoison_task_stack_below(const void *watermark); |
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void __asan_register_globals(struct kasan_global *globals, size_t size); |
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void __asan_unregister_globals(struct kasan_global *globals, size_t size); |
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void __asan_handle_no_return(void); |
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void __asan_alloca_poison(unsigned long addr, size_t size); |
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void __asan_allocas_unpoison(const void *stack_top, const void *stack_bottom); |
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void __asan_load1(unsigned long addr); |
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void __asan_store1(unsigned long addr); |
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void __asan_load2(unsigned long addr); |
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void __asan_store2(unsigned long addr); |
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void __asan_load4(unsigned long addr); |
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void __asan_store4(unsigned long addr); |
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void __asan_load8(unsigned long addr); |
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void __asan_store8(unsigned long addr); |
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void __asan_load16(unsigned long addr); |
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void __asan_store16(unsigned long addr); |
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void __asan_loadN(unsigned long addr, size_t size); |
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void __asan_storeN(unsigned long addr, size_t size); |
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void __asan_load1_noabort(unsigned long addr); |
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void __asan_store1_noabort(unsigned long addr); |
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void __asan_load2_noabort(unsigned long addr); |
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void __asan_store2_noabort(unsigned long addr); |
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void __asan_load4_noabort(unsigned long addr); |
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void __asan_store4_noabort(unsigned long addr); |
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void __asan_load8_noabort(unsigned long addr); |
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void __asan_store8_noabort(unsigned long addr); |
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void __asan_load16_noabort(unsigned long addr); |
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void __asan_store16_noabort(unsigned long addr); |
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void __asan_loadN_noabort(unsigned long addr, size_t size); |
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void __asan_storeN_noabort(unsigned long addr, size_t size); |
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void __asan_report_load1_noabort(unsigned long addr); |
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void __asan_report_store1_noabort(unsigned long addr); |
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void __asan_report_load2_noabort(unsigned long addr); |
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void __asan_report_store2_noabort(unsigned long addr); |
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void __asan_report_load4_noabort(unsigned long addr); |
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void __asan_report_store4_noabort(unsigned long addr); |
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void __asan_report_load8_noabort(unsigned long addr); |
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void __asan_report_store8_noabort(unsigned long addr); |
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void __asan_report_load16_noabort(unsigned long addr); |
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void __asan_report_store16_noabort(unsigned long addr); |
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void __asan_report_load_n_noabort(unsigned long addr, size_t size); |
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void __asan_report_store_n_noabort(unsigned long addr, size_t size); |
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void __asan_set_shadow_00(const void *addr, size_t size); |
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void __asan_set_shadow_f1(const void *addr, size_t size); |
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void __asan_set_shadow_f2(const void *addr, size_t size); |
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void __asan_set_shadow_f3(const void *addr, size_t size); |
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void __asan_set_shadow_f5(const void *addr, size_t size); |
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void __asan_set_shadow_f8(const void *addr, size_t size); |
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void __hwasan_load1_noabort(unsigned long addr); |
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void __hwasan_store1_noabort(unsigned long addr); |
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void __hwasan_load2_noabort(unsigned long addr); |
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void __hwasan_store2_noabort(unsigned long addr); |
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void __hwasan_load4_noabort(unsigned long addr); |
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void __hwasan_store4_noabort(unsigned long addr); |
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void __hwasan_load8_noabort(unsigned long addr); |
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void __hwasan_store8_noabort(unsigned long addr); |
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void __hwasan_load16_noabort(unsigned long addr); |
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void __hwasan_store16_noabort(unsigned long addr); |
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void __hwasan_loadN_noabort(unsigned long addr, size_t size); |
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void __hwasan_storeN_noabort(unsigned long addr, size_t size); |
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void __hwasan_tag_memory(unsigned long addr, u8 tag, unsigned long size); |
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#endif
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