kasan.h 7.18 KB
Newer Older
1
/* SPDX-License-Identifier: GPL-2.0 */
2
3
4
5
6
7
8
#ifndef _LINUX_KASAN_H
#define _LINUX_KASAN_H

#include <linux/types.h>

struct kmem_cache;
struct page;
9
struct vm_struct;
10
struct task_struct;
11
12
13

#ifdef CONFIG_KASAN

14
#include <linux/pgtable.h>
15
#include <asm/kasan.h>
16

Patricia Alfonso's avatar
Patricia Alfonso committed
17
18
19
20
21
22
/* kasan_data struct is used in KUnit tests for KASAN expected failures */
struct kunit_kasan_expectation {
	bool report_expected;
	bool report_found;
};

23
24
25
26
27
extern unsigned char kasan_early_shadow_page[PAGE_SIZE];
extern pte_t kasan_early_shadow_pte[PTRS_PER_PTE];
extern pmd_t kasan_early_shadow_pmd[PTRS_PER_PMD];
extern pud_t kasan_early_shadow_pud[PTRS_PER_PUD];
extern p4d_t kasan_early_shadow_p4d[MAX_PTRS_PER_P4D];
28

29
int kasan_populate_early_shadow(const void *shadow_start,
30
31
				const void *shadow_end);

32
33
34
35
36
37
38
static inline void *kasan_mem_to_shadow(const void *addr)
{
	return (void *)((unsigned long)addr >> KASAN_SHADOW_SCALE_SHIFT)
		+ KASAN_SHADOW_OFFSET;
}

/* Enable reporting bugs after kasan_disable_current() */
39
extern void kasan_enable_current(void);
40
41

/* Disable reporting bugs for current task */
42
extern void kasan_disable_current(void);
43
44
45

void kasan_unpoison_shadow(const void *address, size_t size);

46
47
void kasan_unpoison_task_stack(struct task_struct *task);

48
49
50
void kasan_alloc_pages(struct page *page, unsigned int order);
void kasan_free_pages(struct page *page, unsigned int order);

51
void kasan_cache_create(struct kmem_cache *cache, unsigned int *size,
52
			slab_flags_t *flags);
Alexander Potapenko's avatar
Alexander Potapenko committed
53

54
55
56
void kasan_poison_slab(struct page *page);
void kasan_unpoison_object_data(struct kmem_cache *cache, void *object);
void kasan_poison_object_data(struct kmem_cache *cache, void *object);
57
58
void * __must_check kasan_init_slab_obj(struct kmem_cache *cache,
					const void *object);
59

60
61
void * __must_check kasan_kmalloc_large(const void *ptr, size_t size,
						gfp_t flags);
62
void kasan_kfree_large(void *ptr, unsigned long ip);
63
void kasan_poison_kfree(void *ptr, unsigned long ip);
64
65
66
67
void * __must_check kasan_kmalloc(struct kmem_cache *s, const void *object,
					size_t size, gfp_t flags);
void * __must_check kasan_krealloc(const void *object, size_t new_size,
					gfp_t flags);
68

69
70
void * __must_check kasan_slab_alloc(struct kmem_cache *s, void *object,
					gfp_t flags);
71
bool kasan_slab_free(struct kmem_cache *s, void *object, unsigned long ip);
72

Alexander Potapenko's avatar
Alexander Potapenko committed
73
74
75
76
77
struct kasan_cache {
	int alloc_meta_offset;
	int free_meta_offset;
};

78
79
80
81
82
83
/*
 * These functions provide a special case to support backing module
 * allocations with real shadow memory. With KASAN vmalloc, the special
 * case is unnecessary, as the work is handled in the generic case.
 */
#ifndef CONFIG_KASAN_VMALLOC
84
int kasan_module_alloc(void *addr, size_t size);
85
void kasan_free_shadow(const struct vm_struct *vm);
86
87
88
89
#else
static inline int kasan_module_alloc(void *addr, size_t size) { return 0; }
static inline void kasan_free_shadow(const struct vm_struct *vm) {}
#endif
90

91
92
93
int kasan_add_zero_shadow(void *start, unsigned long size);
void kasan_remove_zero_shadow(void *start, unsigned long size);

94
95
96
97
98
size_t __ksize(const void *);
static inline void kasan_unpoison_slab(const void *ptr)
{
	kasan_unpoison_shadow(ptr, __ksize(ptr));
}
99
size_t kasan_metadata_size(struct kmem_cache *cache);
100

101
102
103
bool kasan_save_enable_multi_shot(void);
void kasan_restore_multi_shot(bool enabled);

104
105
106
107
#else /* CONFIG_KASAN */

static inline void kasan_unpoison_shadow(const void *address, size_t size) {}

108
109
static inline void kasan_unpoison_task_stack(struct task_struct *task) {}

110
111
112
static inline void kasan_enable_current(void) {}
static inline void kasan_disable_current(void) {}

113
114
115
static inline void kasan_alloc_pages(struct page *page, unsigned int order) {}
static inline void kasan_free_pages(struct page *page, unsigned int order) {}

Alexander Potapenko's avatar
Alexander Potapenko committed
116
static inline void kasan_cache_create(struct kmem_cache *cache,
117
				      unsigned int *size,
118
				      slab_flags_t *flags) {}
Alexander Potapenko's avatar
Alexander Potapenko committed
119

120
121
122
123
124
static inline void kasan_poison_slab(struct page *page) {}
static inline void kasan_unpoison_object_data(struct kmem_cache *cache,
					void *object) {}
static inline void kasan_poison_object_data(struct kmem_cache *cache,
					void *object) {}
125
126
127
128
129
static inline void *kasan_init_slab_obj(struct kmem_cache *cache,
				const void *object)
{
	return (void *)object;
}
130

131
132
133
134
static inline void *kasan_kmalloc_large(void *ptr, size_t size, gfp_t flags)
{
	return ptr;
}
135
static inline void kasan_kfree_large(void *ptr, unsigned long ip) {}
136
static inline void kasan_poison_kfree(void *ptr, unsigned long ip) {}
137
138
139
140
141
142
143
144
145
146
static inline void *kasan_kmalloc(struct kmem_cache *s, const void *object,
				size_t size, gfp_t flags)
{
	return (void *)object;
}
static inline void *kasan_krealloc(const void *object, size_t new_size,
				 gfp_t flags)
{
	return (void *)object;
}
147

148
149
150
151
152
static inline void *kasan_slab_alloc(struct kmem_cache *s, void *object,
				   gfp_t flags)
{
	return object;
}
153
154
static inline bool kasan_slab_free(struct kmem_cache *s, void *object,
				   unsigned long ip)
155
156
157
{
	return false;
}
158

159
static inline int kasan_module_alloc(void *addr, size_t size) { return 0; }
160
static inline void kasan_free_shadow(const struct vm_struct *vm) {}
161

162
163
164
165
166
167
168
169
static inline int kasan_add_zero_shadow(void *start, unsigned long size)
{
	return 0;
}
static inline void kasan_remove_zero_shadow(void *start,
					unsigned long size)
{}

170
static inline void kasan_unpoison_slab(const void *ptr) { }
171
static inline size_t kasan_metadata_size(struct kmem_cache *cache) { return 0; }
172

173
174
#endif /* CONFIG_KASAN */

175
176
#ifdef CONFIG_KASAN_GENERIC

177
178
#define KASAN_SHADOW_INIT 0

179
180
void kasan_cache_shrink(struct kmem_cache *cache);
void kasan_cache_shutdown(struct kmem_cache *cache);
181
void kasan_record_aux_stack(void *ptr);
182
183
184
185
186

#else /* CONFIG_KASAN_GENERIC */

static inline void kasan_cache_shrink(struct kmem_cache *cache) {}
static inline void kasan_cache_shutdown(struct kmem_cache *cache) {}
187
static inline void kasan_record_aux_stack(void *ptr) {}
188
189
190

#endif /* CONFIG_KASAN_GENERIC */

191
192
193
194
#ifdef CONFIG_KASAN_SW_TAGS

#define KASAN_SHADOW_INIT 0xFF

195
196
197
198
void kasan_init_tags(void);

void *kasan_reset_tag(const void *addr);

199
bool kasan_report(unsigned long addr, size_t size,
200
201
		bool is_write, unsigned long ip);

202
203
204
205
206
207
208
209
210
#else /* CONFIG_KASAN_SW_TAGS */

static inline void kasan_init_tags(void) { }

static inline void *kasan_reset_tag(const void *addr)
{
	return (void *)addr;
}

211
212
#endif /* CONFIG_KASAN_SW_TAGS */

213
#ifdef CONFIG_KASAN_VMALLOC
214
215
216
int kasan_populate_vmalloc(unsigned long addr, unsigned long size);
void kasan_poison_vmalloc(const void *start, unsigned long size);
void kasan_unpoison_vmalloc(const void *start, unsigned long size);
217
218
219
220
void kasan_release_vmalloc(unsigned long start, unsigned long end,
			   unsigned long free_region_start,
			   unsigned long free_region_end);
#else
221
222
static inline int kasan_populate_vmalloc(unsigned long start,
					unsigned long size)
223
224
225
226
{
	return 0;
}

227
228
229
230
static inline void kasan_poison_vmalloc(const void *start, unsigned long size)
{ }
static inline void kasan_unpoison_vmalloc(const void *start, unsigned long size)
{ }
231
232
233
234
235
236
static inline void kasan_release_vmalloc(unsigned long start,
					 unsigned long end,
					 unsigned long free_region_start,
					 unsigned long free_region_end) {}
#endif

237
238
239
240
241
242
#ifdef CONFIG_KASAN_INLINE
void kasan_non_canonical_hook(unsigned long addr);
#else /* CONFIG_KASAN_INLINE */
static inline void kasan_non_canonical_hook(unsigned long addr) { }
#endif /* CONFIG_KASAN_INLINE */

243
#endif /* LINUX_KASAN_H */