Linux kernel mirror (for testing)
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linux
1/* SPDX-License-Identifier: GPL-2.0 */
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#define KASAN_SHADOW_SCALE_SHIFT 3
15
16#include <asm/kasan.h>
17#include <asm/pgtable.h>
18
19extern unsigned char kasan_zero_page[PAGE_SIZE];
20extern pte_t kasan_zero_pte[PTRS_PER_PTE];
21extern pmd_t kasan_zero_pmd[PTRS_PER_PMD];
22extern pud_t kasan_zero_pud[PTRS_PER_PUD];
23extern p4d_t kasan_zero_p4d[PTRS_PER_P4D];
24
25void kasan_populate_zero_shadow(const void *shadow_start,
26 const void *shadow_end);
27
28static inline void *kasan_mem_to_shadow(const void *addr)
29{
30 return (void *)((unsigned long)addr >> KASAN_SHADOW_SCALE_SHIFT)
31 + KASAN_SHADOW_OFFSET;
32}
33
34/* Enable reporting bugs after kasan_disable_current() */
35extern void kasan_enable_current(void);
36
37/* Disable reporting bugs for current task */
38extern void kasan_disable_current(void);
39
40void kasan_unpoison_shadow(const void *address, size_t size);
41
42void kasan_unpoison_task_stack(struct task_struct *task);
43void kasan_unpoison_stack_above_sp_to(const void *watermark);
44
45void kasan_alloc_pages(struct page *page, unsigned int order);
46void kasan_free_pages(struct page *page, unsigned int order);
47
48void kasan_cache_create(struct kmem_cache *cache, size_t *size,
49 unsigned long *flags);
50void kasan_cache_shrink(struct kmem_cache *cache);
51void kasan_cache_shutdown(struct kmem_cache *cache);
52
53void kasan_poison_slab(struct page *page);
54void kasan_unpoison_object_data(struct kmem_cache *cache, void *object);
55void kasan_poison_object_data(struct kmem_cache *cache, void *object);
56void kasan_init_slab_obj(struct kmem_cache *cache, const void *object);
57
58void kasan_kmalloc_large(const void *ptr, size_t size, gfp_t flags);
59void kasan_kfree_large(const void *ptr);
60void kasan_poison_kfree(void *ptr);
61void kasan_kmalloc(struct kmem_cache *s, const void *object, size_t size,
62 gfp_t flags);
63void kasan_krealloc(const void *object, size_t new_size, gfp_t flags);
64
65void kasan_slab_alloc(struct kmem_cache *s, void *object, gfp_t flags);
66bool kasan_slab_free(struct kmem_cache *s, void *object);
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
76size_t ksize(const void *);
77static inline void kasan_unpoison_slab(const void *ptr) { ksize(ptr); }
78size_t kasan_metadata_size(struct kmem_cache *cache);
79
80bool kasan_save_enable_multi_shot(void);
81void kasan_restore_multi_shot(bool enabled);
82
83#else /* CONFIG_KASAN */
84
85static inline void kasan_unpoison_shadow(const void *address, size_t size) {}
86
87static inline void kasan_unpoison_task_stack(struct task_struct *task) {}
88static inline void kasan_unpoison_stack_above_sp_to(const void *watermark) {}
89
90static inline void kasan_enable_current(void) {}
91static inline void kasan_disable_current(void) {}
92
93static inline void kasan_alloc_pages(struct page *page, unsigned int order) {}
94static inline void kasan_free_pages(struct page *page, unsigned int order) {}
95
96static inline void kasan_cache_create(struct kmem_cache *cache,
97 size_t *size,
98 unsigned long *flags) {}
99static inline void kasan_cache_shrink(struct kmem_cache *cache) {}
100static inline void kasan_cache_shutdown(struct kmem_cache *cache) {}
101
102static inline void kasan_poison_slab(struct page *page) {}
103static inline void kasan_unpoison_object_data(struct kmem_cache *cache,
104 void *object) {}
105static inline void kasan_poison_object_data(struct kmem_cache *cache,
106 void *object) {}
107static inline void kasan_init_slab_obj(struct kmem_cache *cache,
108 const void *object) {}
109
110static inline void kasan_kmalloc_large(void *ptr, size_t size, gfp_t flags) {}
111static inline void kasan_kfree_large(const void *ptr) {}
112static inline void kasan_poison_kfree(void *ptr) {}
113static inline void kasan_kmalloc(struct kmem_cache *s, const void *object,
114 size_t size, gfp_t flags) {}
115static inline void kasan_krealloc(const void *object, size_t new_size,
116 gfp_t flags) {}
117
118static inline void kasan_slab_alloc(struct kmem_cache *s, void *object,
119 gfp_t flags) {}
120static inline bool kasan_slab_free(struct kmem_cache *s, void *object)
121{
122 return false;
123}
124
125static inline int kasan_module_alloc(void *addr, size_t size) { return 0; }
126static inline void kasan_free_shadow(const struct vm_struct *vm) {}
127
128static inline void kasan_unpoison_slab(const void *ptr) { }
129static inline size_t kasan_metadata_size(struct kmem_cache *cache) { return 0; }
130
131#endif /* CONFIG_KASAN */
132
133#endif /* LINUX_KASAN_H */