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1#ifndef __MM_KASAN_KASAN_H
2#define __MM_KASAN_KASAN_H
3
4#include <linux/kasan.h>
5#include <linux/stackdepot.h>
6
7#define KASAN_SHADOW_SCALE_SIZE (1UL << KASAN_SHADOW_SCALE_SHIFT)
8#define KASAN_SHADOW_MASK (KASAN_SHADOW_SCALE_SIZE - 1)
9
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 */
15
16/*
17 * Stack redzone shadow values
18 * (Those are compiler's ABI, don't change them)
19 */
20#define KASAN_STACK_LEFT 0xF1
21#define KASAN_STACK_MID 0xF2
22#define KASAN_STACK_RIGHT 0xF3
23#define KASAN_STACK_PARTIAL 0xF4
24
25/* Don't break randconfig/all*config builds */
26#ifndef KASAN_ABI_VERSION
27#define KASAN_ABI_VERSION 1
28#endif
29
30struct kasan_access_info {
31 const void *access_addr;
32 const void *first_bad_addr;
33 size_t access_size;
34 bool is_write;
35 unsigned long ip;
36};
37
38/* The layout of struct dictated by compiler */
39struct kasan_source_location {
40 const char *filename;
41 int line_no;
42 int column_no;
43};
44
45/* The layout of struct dictated by compiler */
46struct kasan_global {
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 */
50 const void *name;
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;
55#endif
56};
57
58/**
59 * Structures to keep alloc and free tracks *
60 */
61
62enum kasan_state {
63 KASAN_STATE_INIT,
64 KASAN_STATE_ALLOC,
65 KASAN_STATE_FREE
66};
67
68#define KASAN_STACK_DEPTH 64
69
70struct kasan_track {
71 u32 pid;
72 depot_stack_handle_t stack;
73};
74
75struct kasan_alloc_meta {
76 struct kasan_track track;
77 u32 state : 2; /* enum kasan_state */
78 u32 alloc_size : 30;
79 u32 reserved;
80};
81
82struct kasan_free_meta {
83 /* Allocator freelist pointer, unused by KASAN. */
84 void **freelist;
85 struct kasan_track track;
86};
87
88struct kasan_alloc_meta *get_alloc_info(struct kmem_cache *cache,
89 const void *object);
90struct kasan_free_meta *get_free_info(struct kmem_cache *cache,
91 const void *object);
92
93
94static inline const void *kasan_shadow_to_mem(const void *shadow_addr)
95{
96 return (void *)(((unsigned long)shadow_addr - KASAN_SHADOW_OFFSET)
97 << KASAN_SHADOW_SCALE_SHIFT);
98}
99
100static inline bool kasan_report_enabled(void)
101{
102 return !current->kasan_depth;
103}
104
105void kasan_report(unsigned long addr, size_t size,
106 bool is_write, unsigned long ip);
107
108#endif
1#ifndef __MM_KASAN_KASAN_H
2#define __MM_KASAN_KASAN_H
3
4#include <linux/kasan.h>
5#include <linux/stackdepot.h>
6
7#define KASAN_SHADOW_SCALE_SIZE (1UL << KASAN_SHADOW_SCALE_SHIFT)
8#define KASAN_SHADOW_MASK (KASAN_SHADOW_SCALE_SIZE - 1)
9
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 */
15
16/*
17 * Stack redzone shadow values
18 * (Those are compiler's ABI, don't change them)
19 */
20#define KASAN_STACK_LEFT 0xF1
21#define KASAN_STACK_MID 0xF2
22#define KASAN_STACK_RIGHT 0xF3
23#define KASAN_STACK_PARTIAL 0xF4
24#define KASAN_USE_AFTER_SCOPE 0xF8
25
26/* Don't break randconfig/all*config builds */
27#ifndef KASAN_ABI_VERSION
28#define KASAN_ABI_VERSION 1
29#endif
30
31struct kasan_access_info {
32 const void *access_addr;
33 const void *first_bad_addr;
34 size_t access_size;
35 bool is_write;
36 unsigned long ip;
37};
38
39/* The layout of struct dictated by compiler */
40struct kasan_source_location {
41 const char *filename;
42 int line_no;
43 int column_no;
44};
45
46/* The layout of struct dictated by compiler */
47struct kasan_global {
48 const void *beg; /* Address of the beginning of the global variable. */
49 size_t size; /* Size of the global variable. */
50 size_t size_with_redzone; /* Size of the variable + size of the red zone. 32 bytes aligned */
51 const void *name;
52 const void *module_name; /* Name of the module where the global variable is declared. */
53 unsigned long has_dynamic_init; /* This needed for C++ */
54#if KASAN_ABI_VERSION >= 4
55 struct kasan_source_location *location;
56#endif
57#if KASAN_ABI_VERSION >= 5
58 char *odr_indicator;
59#endif
60};
61
62/**
63 * Structures to keep alloc and free tracks *
64 */
65
66#define KASAN_STACK_DEPTH 64
67
68struct kasan_track {
69 u32 pid;
70 depot_stack_handle_t stack;
71};
72
73struct kasan_alloc_meta {
74 struct kasan_track alloc_track;
75 struct kasan_track free_track;
76};
77
78struct qlist_node {
79 struct qlist_node *next;
80};
81struct kasan_free_meta {
82 /* This field is used while the object is in the quarantine.
83 * Otherwise it might be used for the allocator freelist.
84 */
85 struct qlist_node quarantine_link;
86};
87
88struct kasan_alloc_meta *get_alloc_info(struct kmem_cache *cache,
89 const void *object);
90struct kasan_free_meta *get_free_info(struct kmem_cache *cache,
91 const void *object);
92
93static inline const void *kasan_shadow_to_mem(const void *shadow_addr)
94{
95 return (void *)(((unsigned long)shadow_addr - KASAN_SHADOW_OFFSET)
96 << KASAN_SHADOW_SCALE_SHIFT);
97}
98
99static inline bool kasan_report_enabled(void)
100{
101 return !current->kasan_depth;
102}
103
104void kasan_report(unsigned long addr, size_t size,
105 bool is_write, unsigned long ip);
106void kasan_report_double_free(struct kmem_cache *cache, void *object,
107 s8 shadow);
108
109#if defined(CONFIG_SLAB) || defined(CONFIG_SLUB)
110void quarantine_put(struct kasan_free_meta *info, struct kmem_cache *cache);
111void quarantine_reduce(void);
112void quarantine_remove_cache(struct kmem_cache *cache);
113#else
114static inline void quarantine_put(struct kasan_free_meta *info,
115 struct kmem_cache *cache) { }
116static inline void quarantine_reduce(void) { }
117static inline void quarantine_remove_cache(struct kmem_cache *cache) { }
118#endif
119
120#endif