1
2#ifndef _LINUX_KASAN_H
3#define _LINUX_KASAN_H
4
5#include <linux/types.h>
6
7struct kmem_cache;
8struct page;
9struct vm_struct;
10struct task_struct;
11
12#ifdef CONFIG_KASAN
13
14#include <asm/kasan.h>
15#include <asm/pgtable.h>
16
17extern unsigned char kasan_early_shadow_page[PAGE_SIZE];
18extern pte_t kasan_early_shadow_pte[PTRS_PER_PTE];
19extern pmd_t kasan_early_shadow_pmd[PTRS_PER_PMD];
20extern pud_t kasan_early_shadow_pud[PTRS_PER_PUD];
21extern p4d_t kasan_early_shadow_p4d[MAX_PTRS_PER_P4D];
22
23int kasan_populate_early_shadow(const void *shadow_start,
24 const void *shadow_end);
25
26static inline void *kasan_mem_to_shadow(const void *addr)
27{
28 return (void *)((unsigned long)addr >> KASAN_SHADOW_SCALE_SHIFT)
29 + KASAN_SHADOW_OFFSET;
30}
31
32
33extern void kasan_enable_current(void);
34
35
36extern void kasan_disable_current(void);
37
38void kasan_unpoison_shadow(const void *address, size_t size);
39
40void kasan_unpoison_task_stack(struct task_struct *task);
41void kasan_unpoison_stack_above_sp_to(const void *watermark);
42
43void kasan_alloc_pages(struct page *page, unsigned int order);
44void kasan_free_pages(struct page *page, unsigned int order);
45
46void kasan_cache_create(struct kmem_cache *cache, unsigned int *size,
47 slab_flags_t *flags);
48
49void kasan_poison_slab(struct page *page);
50void kasan_unpoison_object_data(struct kmem_cache *cache, void *object);
51void kasan_poison_object_data(struct kmem_cache *cache, void *object);
52void * __must_check kasan_init_slab_obj(struct kmem_cache *cache,
53 const void *object);
54
55void * __must_check kasan_kmalloc_large(const void *ptr, size_t size,
56 gfp_t flags);
57void kasan_kfree_large(void *ptr, unsigned long ip);
58void kasan_poison_kfree(void *ptr, unsigned long ip);
59void * __must_check kasan_kmalloc(struct kmem_cache *s, const void *object,
60 size_t size, gfp_t flags);
61void * __must_check kasan_krealloc(const void *object, size_t new_size,
62 gfp_t flags);
63
64void * __must_check kasan_slab_alloc(struct kmem_cache *s, void *object,
65 gfp_t flags);
66bool kasan_slab_free(struct kmem_cache *s, void *object, unsigned long ip);
67
68struct kasan_cache {
69 int alloc_meta_offset;
70 int free_meta_offset;
71};
72
73int kasan_module_alloc(void *addr, size_t size);
74void kasan_free_shadow(const struct vm_struct *vm);
75
76int kasan_add_zero_shadow(void *start, unsigned long size);
77void kasan_remove_zero_shadow(void *start, unsigned long size);
78
79size_t __ksize(const void *);
80static inline void kasan_unpoison_slab(const void *ptr)
81{
82 kasan_unpoison_shadow(ptr, __ksize(ptr));
83}
84size_t kasan_metadata_size(struct kmem_cache *cache);
85
86bool kasan_save_enable_multi_shot(void);
87void kasan_restore_multi_shot(bool enabled);
88
89#else
90
91static inline void kasan_unpoison_shadow(const void *address, size_t size) {}
92
93static inline void kasan_unpoison_task_stack(struct task_struct *task) {}
94static inline void kasan_unpoison_stack_above_sp_to(const void *watermark) {}
95
96static inline void kasan_enable_current(void) {}
97static inline void kasan_disable_current(void) {}
98
99static inline void kasan_alloc_pages(struct page *page, unsigned int order) {}
100static inline void kasan_free_pages(struct page *page, unsigned int order) {}
101
102static inline void kasan_cache_create(struct kmem_cache *cache,
103 unsigned int *size,
104 slab_flags_t *flags) {}
105
106static inline void kasan_poison_slab(struct page *page) {}
107static inline void kasan_unpoison_object_data(struct kmem_cache *cache,
108 void *object) {}
109static inline void kasan_poison_object_data(struct kmem_cache *cache,
110 void *object) {}
111static inline void *kasan_init_slab_obj(struct kmem_cache *cache,
112 const void *object)
113{
114 return (void *)object;
115}
116
117static inline void *kasan_kmalloc_large(void *ptr, size_t size, gfp_t flags)
118{
119 return ptr;
120}
121static inline void kasan_kfree_large(void *ptr, unsigned long ip) {}
122static inline void kasan_poison_kfree(void *ptr, unsigned long ip) {}
123static inline void *kasan_kmalloc(struct kmem_cache *s, const void *object,
124 size_t size, gfp_t flags)
125{
126 return (void *)object;
127}
128static inline void *kasan_krealloc(const void *object, size_t new_size,
129 gfp_t flags)
130{
131 return (void *)object;
132}
133
134static inline void *kasan_slab_alloc(struct kmem_cache *s, void *object,
135 gfp_t flags)
136{
137 return object;
138}
139static inline bool kasan_slab_free(struct kmem_cache *s, void *object,
140 unsigned long ip)
141{
142 return false;
143}
144
145static inline int kasan_module_alloc(void *addr, size_t size) { return 0; }
146static inline void kasan_free_shadow(const struct vm_struct *vm) {}
147
148static inline int kasan_add_zero_shadow(void *start, unsigned long size)
149{
150 return 0;
151}
152static inline void kasan_remove_zero_shadow(void *start,
153 unsigned long size)
154{}
155
156static inline void kasan_unpoison_slab(const void *ptr) { }
157static inline size_t kasan_metadata_size(struct kmem_cache *cache) { return 0; }
158
159#endif
160
161#ifdef CONFIG_KASAN_GENERIC
162
163#define KASAN_SHADOW_INIT 0
164
165void kasan_cache_shrink(struct kmem_cache *cache);
166void kasan_cache_shutdown(struct kmem_cache *cache);
167
168#else
169
170static inline void kasan_cache_shrink(struct kmem_cache *cache) {}
171static inline void kasan_cache_shutdown(struct kmem_cache *cache) {}
172
173#endif
174
175#ifdef CONFIG_KASAN_SW_TAGS
176
177#define KASAN_SHADOW_INIT 0xFF
178
179void kasan_init_tags(void);
180
181void *kasan_reset_tag(const void *addr);
182
183void kasan_report(unsigned long addr, size_t size,
184 bool is_write, unsigned long ip);
185
186#else
187
188static inline void kasan_init_tags(void) { }
189
190static inline void *kasan_reset_tag(const void *addr)
191{
192 return (void *)addr;
193}
194
195#endif
196
197#endif
198
