Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
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linux
1#ifndef _LINUX_KASAN_H
2#define _LINUX_KASAN_H
3
4#include <linux/types.h>
5
6struct kmem_cache;
7struct page;
8struct vm_struct;
9struct task_struct;
10
11#ifdef CONFIG_KASAN
12
13#define KASAN_SHADOW_SCALE_SHIFT 3
14
15#include <asm/kasan.h>
16#include <asm/pgtable.h>
17
18extern unsigned char kasan_zero_page[PAGE_SIZE];
19extern pte_t kasan_zero_pte[PTRS_PER_PTE];
20extern pmd_t kasan_zero_pmd[PTRS_PER_PMD];
21extern pud_t kasan_zero_pud[PTRS_PER_PUD];
22extern p4d_t kasan_zero_p4d[PTRS_PER_P4D];
23
24void kasan_populate_zero_shadow(const void *shadow_start,
25 const void *shadow_end);
26
27static inline void *kasan_mem_to_shadow(const void *addr)
28{
29 return (void *)((unsigned long)addr >> KASAN_SHADOW_SCALE_SHIFT)
30 + KASAN_SHADOW_OFFSET;
31}
32
33/* Enable reporting bugs after kasan_disable_current() */
34extern void kasan_enable_current(void);
35
36/* Disable reporting bugs for current task */
37extern void kasan_disable_current(void);
38
39void kasan_unpoison_shadow(const void *address, size_t size);
40
41void kasan_unpoison_task_stack(struct task_struct *task);
42void kasan_unpoison_stack_above_sp_to(const void *watermark);
43
44void kasan_alloc_pages(struct page *page, unsigned int order);
45void kasan_free_pages(struct page *page, unsigned int order);
46
47void kasan_cache_create(struct kmem_cache *cache, size_t *size,
48 unsigned long *flags);
49void kasan_cache_shrink(struct kmem_cache *cache);
50void kasan_cache_shutdown(struct kmem_cache *cache);
51
52void kasan_poison_slab(struct page *page);
53void kasan_unpoison_object_data(struct kmem_cache *cache, void *object);
54void kasan_poison_object_data(struct kmem_cache *cache, void *object);
55void kasan_init_slab_obj(struct kmem_cache *cache, const void *object);
56
57void kasan_kmalloc_large(const void *ptr, size_t size, gfp_t flags);
58void kasan_kfree_large(const void *ptr);
59void kasan_poison_kfree(void *ptr);
60void kasan_kmalloc(struct kmem_cache *s, const void *object, size_t size,
61 gfp_t flags);
62void kasan_krealloc(const void *object, size_t new_size, gfp_t flags);
63
64void kasan_slab_alloc(struct kmem_cache *s, void *object, gfp_t flags);
65bool kasan_slab_free(struct kmem_cache *s, void *object);
66
67struct kasan_cache {
68 int alloc_meta_offset;
69 int free_meta_offset;
70};
71
72int kasan_module_alloc(void *addr, size_t size);
73void kasan_free_shadow(const struct vm_struct *vm);
74
75size_t ksize(const void *);
76static inline void kasan_unpoison_slab(const void *ptr) { ksize(ptr); }
77size_t kasan_metadata_size(struct kmem_cache *cache);
78
79bool kasan_save_enable_multi_shot(void);
80void kasan_restore_multi_shot(bool enabled);
81
82#else /* CONFIG_KASAN */
83
84static inline void kasan_unpoison_shadow(const void *address, size_t size) {}
85
86static inline void kasan_unpoison_task_stack(struct task_struct *task) {}
87static inline void kasan_unpoison_stack_above_sp_to(const void *watermark) {}
88
89static inline void kasan_enable_current(void) {}
90static inline void kasan_disable_current(void) {}
91
92static inline void kasan_alloc_pages(struct page *page, unsigned int order) {}
93static inline void kasan_free_pages(struct page *page, unsigned int order) {}
94
95static inline void kasan_cache_create(struct kmem_cache *cache,
96 size_t *size,
97 unsigned long *flags) {}
98static inline void kasan_cache_shrink(struct kmem_cache *cache) {}
99static inline void kasan_cache_shutdown(struct kmem_cache *cache) {}
100
101static inline void kasan_poison_slab(struct page *page) {}
102static inline void kasan_unpoison_object_data(struct kmem_cache *cache,
103 void *object) {}
104static inline void kasan_poison_object_data(struct kmem_cache *cache,
105 void *object) {}
106static inline void kasan_init_slab_obj(struct kmem_cache *cache,
107 const void *object) {}
108
109static inline void kasan_kmalloc_large(void *ptr, size_t size, gfp_t flags) {}
110static inline void kasan_kfree_large(const void *ptr) {}
111static inline void kasan_poison_kfree(void *ptr) {}
112static inline void kasan_kmalloc(struct kmem_cache *s, const void *object,
113 size_t size, gfp_t flags) {}
114static inline void kasan_krealloc(const void *object, size_t new_size,
115 gfp_t flags) {}
116
117static inline void kasan_slab_alloc(struct kmem_cache *s, void *object,
118 gfp_t flags) {}
119static inline bool kasan_slab_free(struct kmem_cache *s, void *object)
120{
121 return false;
122}
123
124static inline int kasan_module_alloc(void *addr, size_t size) { return 0; }
125static inline void kasan_free_shadow(const struct vm_struct *vm) {}
126
127static inline void kasan_unpoison_slab(const void *ptr) { }
128static inline size_t kasan_metadata_size(struct kmem_cache *cache) { return 0; }
129
130#endif /* CONFIG_KASAN */
131
132#endif /* LINUX_KASAN_H */