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