summaryrefslogtreecommitdiffstats
path: root/include/linux/kasan.h
blob: 820c0ad54a0117596e63bae6845b1ebd771c3412 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
#ifndef _LINUX_KASAN_H
#define _LINUX_KASAN_H

#include <linux/sched.h>
#include <linux/types.h>

struct kmem_cache;
struct page;
struct vm_struct;

#ifdef CONFIG_KASAN

#define KASAN_SHADOW_SCALE_SHIFT 3

#include <asm/kasan.h>
#include <asm/pgtable.h>

extern unsigned char kasan_zero_page[PAGE_SIZE];
extern pte_t kasan_zero_pte[PTRS_PER_PTE];
extern pmd_t kasan_zero_pmd[PTRS_PER_PMD];
extern pud_t kasan_zero_pud[PTRS_PER_PUD];

void kasan_populate_zero_shadow(const void *shadow_start,
				const void *shadow_end);

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() */
static inline void kasan_enable_current(void)
{
	current->kasan_depth++;
}

/* Disable reporting bugs for current task */
static inline void kasan_disable_current(void)
{
	current->kasan_depth--;
}

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

void kasan_unpoison_task_stack(struct task_struct *task);
void kasan_unpoison_stack_above_sp_to(const void *watermark);

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

void kasan_cache_create(struct kmem_cache *cache, size_t *size,
			unsigned long *flags);
void kasan_cache_shrink(struct kmem_cache *cache);
void kasan_cache_destroy(struct kmem_cache *cache);

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);
void kasan_init_slab_obj(struct kmem_cache *cache, const void *object);

void kasan_kmalloc_large(const void *ptr, size_t size, gfp_t flags);
void kasan_kfree_large(const void *ptr);
void kasan_poison_kfree(void *ptr);
void kasan_kmalloc(struct kmem_cache *s, const void *object, size_t size,
		  gfp_t flags);
void kasan_krealloc(const void *object, size_t new_size, gfp_t flags);

void kasan_slab_alloc(struct kmem_cache *s, void *object, gfp_t flags);
bool kasan_slab_free(struct kmem_cache *s, void *object);

struct kasan_cache {
	int alloc_meta_offset;
	int free_meta_offset;
};

int kasan_module_alloc(void *addr, size_t size);
void kasan_free_shadow(const struct vm_struct *vm);

size_t ksize(const void *);
static inline void kasan_unpoison_slab(const void *ptr) { ksize(ptr); }
size_t kasan_metadata_size(struct kmem_cache *cache);

#else /* CONFIG_KASAN */

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

static inline void kasan_unpoison_task_stack(struct task_struct *task) {}
static inline void kasan_unpoison_stack_above_sp_to(const void *watermark) {}

static inline void kasan_enable_current(void) {}
static inline void kasan_disable_current(void) {}

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

static inline void kasan_cache_create(struct kmem_cache *cache,
				      size_t *size,
				      unsigned long *flags) {}
static inline void kasan_cache_shrink(struct kmem_cache *cache) {}
static inline void kasan_cache_destroy(struct kmem_cache *cache) {}

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) {}
static inline void kasan_init_slab_obj(struct kmem_cache *cache,
				const void *object) {}

static inline void kasan_kmalloc_large(void *ptr, size_t size, gfp_t flags) {}
static inline void kasan_kfree_large(const void *ptr) {}
static inline void kasan_poison_kfree(void *ptr) {}
static inline void kasan_kmalloc(struct kmem_cache *s, const void *object,
				size_t size, gfp_t flags) {}
static inline void kasan_krealloc(const void *object, size_t new_size,
				 gfp_t flags) {}

static inline void kasan_slab_alloc(struct kmem_cache *s, void *object,
				   gfp_t flags) {}
static inline bool kasan_slab_free(struct kmem_cache *s, void *object)
{
	return false;
}

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

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

#endif /* CONFIG_KASAN */

#endif /* LINUX_KASAN_H */