1 #ifndef __MM_KASAN_KASAN_H
2 #define __MM_KASAN_KASAN_H
4 #include <linux/kasan.h>
5 #include <linux/stackdepot.h>
7 #define KASAN_SHADOW_SCALE_SIZE (1UL << KASAN_SHADOW_SCALE_SHIFT)
8 #define KASAN_SHADOW_MASK (KASAN_SHADOW_SCALE_SIZE - 1)
10 #define KASAN_FREE_PAGE 0xFF /* page was freed */
11 #define KASAN_PAGE_REDZONE 0xFE /* redzone for kmalloc_large allocations */
12 #define KASAN_KMALLOC_REDZONE 0xFC /* redzone inside slub object */
13 #define KASAN_KMALLOC_FREE 0xFB /* object was freed (kmem_cache_free/kfree) */
14 #define KASAN_GLOBAL_REDZONE 0xFA /* redzone for global variable */
17 * Stack redzone shadow values
18 * (Those are compiler's ABI, don't change them)
20 #define KASAN_STACK_LEFT 0xF1
21 #define KASAN_STACK_MID 0xF2
22 #define KASAN_STACK_RIGHT 0xF3
23 #define KASAN_STACK_PARTIAL 0xF4
25 /* Don't break randconfig/all*config builds */
26 #ifndef KASAN_ABI_VERSION
27 #define KASAN_ABI_VERSION 1
30 struct kasan_access_info {
31 const void *access_addr;
32 const void *first_bad_addr;
38 /* The layout of struct dictated by compiler */
39 struct kasan_source_location {
45 /* The layout of struct dictated by compiler */
47 const void *beg; /* Address of the beginning of the global variable. */
48 size_t size; /* Size of the global variable. */
49 size_t size_with_redzone; /* Size of the variable + size of the red zone. 32 bytes aligned */
51 const void *module_name; /* Name of the module where the global variable is declared. */
52 unsigned long has_dynamic_init; /* This needed for C++ */
53 #if KASAN_ABI_VERSION >= 4
54 struct kasan_source_location *location;
59 * Structures to keep alloc and free tracks *
65 KASAN_STATE_QUARANTINE,
69 #define KASAN_STACK_DEPTH 64
73 depot_stack_handle_t stack;
76 struct kasan_alloc_meta {
77 struct kasan_track track;
82 struct qlist_node *next;
84 struct kasan_free_meta {
85 /* This field is used while the object is in the quarantine.
86 * Otherwise it might be used for the allocator freelist.
88 struct qlist_node quarantine_link;
89 struct kasan_track track;
92 struct kasan_alloc_meta *get_alloc_info(struct kmem_cache *cache,
94 struct kasan_free_meta *get_free_info(struct kmem_cache *cache,
97 static inline const void *kasan_shadow_to_mem(const void *shadow_addr)
99 return (void *)(((unsigned long)shadow_addr - KASAN_SHADOW_OFFSET)
100 << KASAN_SHADOW_SCALE_SHIFT);
103 static inline bool kasan_report_enabled(void)
105 return !current->kasan_depth;
108 void kasan_report(unsigned long addr, size_t size,
109 bool is_write, unsigned long ip);
111 #if defined(CONFIG_SLAB) || defined(CONFIG_SLUB)
112 void quarantine_put(struct kasan_free_meta *info, struct kmem_cache *cache);
113 void quarantine_reduce(void);
114 void quarantine_remove_cache(struct kmem_cache *cache);
116 static inline void quarantine_put(struct kasan_free_meta *info,
117 struct kmem_cache *cache) { }
118 static inline void quarantine_reduce(void) { }
119 static inline void quarantine_remove_cache(struct kmem_cache *cache) { }