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0b24becc AR |
1 | #ifndef __MM_KASAN_KASAN_H |
2 | #define __MM_KASAN_KASAN_H | |
3 | ||
4 | #include <linux/kasan.h> | |
5 | ||
6 | #define KASAN_SHADOW_SCALE_SIZE (1UL << KASAN_SHADOW_SCALE_SHIFT) | |
7 | #define KASAN_SHADOW_MASK (KASAN_SHADOW_SCALE_SIZE - 1) | |
8 | ||
0316bec2 AR |
9 | #define KASAN_FREE_PAGE 0xFF /* page was freed */ |
10 | #define KASAN_PAGE_REDZONE 0xFE /* redzone for kmalloc_large allocations */ | |
11 | #define KASAN_KMALLOC_REDZONE 0xFC /* redzone inside slub object */ | |
12 | #define KASAN_KMALLOC_FREE 0xFB /* object was freed (kmem_cache_free/kfree) */ | |
bebf56a1 | 13 | #define KASAN_GLOBAL_REDZONE 0xFA /* redzone for global variable */ |
0316bec2 | 14 | |
c420f167 AR |
15 | /* |
16 | * Stack redzone shadow values | |
17 | * (Those are compiler's ABI, don't change them) | |
18 | */ | |
19 | #define KASAN_STACK_LEFT 0xF1 | |
20 | #define KASAN_STACK_MID 0xF2 | |
21 | #define KASAN_STACK_RIGHT 0xF3 | |
22 | #define KASAN_STACK_PARTIAL 0xF4 | |
23 | ||
bebf56a1 AR |
24 | /* Don't break randconfig/all*config builds */ |
25 | #ifndef KASAN_ABI_VERSION | |
26 | #define KASAN_ABI_VERSION 1 | |
27 | #endif | |
b8c73fc2 | 28 | |
0b24becc AR |
29 | struct kasan_access_info { |
30 | const void *access_addr; | |
31 | const void *first_bad_addr; | |
32 | size_t access_size; | |
33 | bool is_write; | |
34 | unsigned long ip; | |
35 | }; | |
36 | ||
bebf56a1 AR |
37 | /* The layout of struct dictated by compiler */ |
38 | struct kasan_source_location { | |
39 | const char *filename; | |
40 | int line_no; | |
41 | int column_no; | |
42 | }; | |
43 | ||
44 | /* The layout of struct dictated by compiler */ | |
45 | struct kasan_global { | |
46 | const void *beg; /* Address of the beginning of the global variable. */ | |
47 | size_t size; /* Size of the global variable. */ | |
48 | size_t size_with_redzone; /* Size of the variable + size of the red zone. 32 bytes aligned */ | |
49 | const void *name; | |
50 | const void *module_name; /* Name of the module where the global variable is declared. */ | |
51 | unsigned long has_dynamic_init; /* This needed for C++ */ | |
52 | #if KASAN_ABI_VERSION >= 4 | |
53 | struct kasan_source_location *location; | |
54 | #endif | |
55 | }; | |
56 | ||
7ed2f9e6 AP |
57 | /** |
58 | * Structures to keep alloc and free tracks * | |
59 | */ | |
60 | ||
61 | enum kasan_state { | |
62 | KASAN_STATE_INIT, | |
63 | KASAN_STATE_ALLOC, | |
64 | KASAN_STATE_FREE | |
65 | }; | |
66 | ||
67 | struct kasan_track { | |
68 | u64 cpu : 6; /* for NR_CPUS = 64 */ | |
69 | u64 pid : 16; /* 65536 processes */ | |
70 | u64 when : 42; /* ~140 years */ | |
71 | }; | |
72 | ||
73 | struct kasan_alloc_meta { | |
74 | u32 state : 2; /* enum kasan_state */ | |
75 | u32 alloc_size : 30; | |
76 | struct kasan_track track; | |
77 | }; | |
78 | ||
79 | struct kasan_free_meta { | |
80 | /* Allocator freelist pointer, unused by KASAN. */ | |
81 | void **freelist; | |
82 | struct kasan_track track; | |
83 | }; | |
84 | ||
85 | struct kasan_alloc_meta *get_alloc_info(struct kmem_cache *cache, | |
86 | const void *object); | |
87 | struct kasan_free_meta *get_free_info(struct kmem_cache *cache, | |
88 | const void *object); | |
89 | ||
90 | ||
0b24becc AR |
91 | static inline const void *kasan_shadow_to_mem(const void *shadow_addr) |
92 | { | |
93 | return (void *)(((unsigned long)shadow_addr - KASAN_SHADOW_OFFSET) | |
94 | << KASAN_SHADOW_SCALE_SHIFT); | |
95 | } | |
96 | ||
0ba8663c | 97 | static inline bool kasan_report_enabled(void) |
0b24becc AR |
98 | { |
99 | return !current->kasan_depth; | |
100 | } | |
101 | ||
102 | void kasan_report(unsigned long addr, size_t size, | |
103 | bool is_write, unsigned long ip); | |
104 | ||
105 | #endif |