1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_KASAN_H
3 #define _LINUX_KASAN_H
4
5 #include <linux/types.h>
6
7 struct kmem_cache;
8 struct page;
9 struct vm_struct;
10 struct 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
19 extern unsigned char kasan_zero_page[PAGE_SIZE];
20 extern pte_t kasan_zero_pte[PTRS_PER_PTE];
21 extern pmd_t kasan_zero_pmd[PTRS_PER_PMD];
22 extern pud_t kasan_zero_pud[PTRS_PER_PUD];
23 extern p4d_t kasan_zero_p4d[PTRS_PER_P4D];
24
25 void kasan_populate_zero_shadow(const void *shadow_start,
26 const void *shadow_end);
27
kasan_mem_to_shadow(const void * addr)28 static 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() */
35 extern void kasan_enable_current(void);
36
37 /* Disable reporting bugs for current task */
38 extern void kasan_disable_current(void);
39
40 void kasan_unpoison_shadow(const void *address, size_t size);
41
42 void kasan_unpoison_task_stack(struct task_struct *task);
43 void kasan_unpoison_stack_above_sp_to(const void *watermark);
44
45 void kasan_alloc_pages(struct page *page, unsigned int order);
46 void kasan_free_pages(struct page *page, unsigned int order);
47
48 void kasan_cache_create(struct kmem_cache *cache, size_t *size,
49 unsigned long *flags);
50 void kasan_cache_shrink(struct kmem_cache *cache);
51 void kasan_cache_shutdown(struct kmem_cache *cache);
52
53 void kasan_poison_slab(struct page *page);
54 void kasan_unpoison_object_data(struct kmem_cache *cache, void *object);
55 void kasan_poison_object_data(struct kmem_cache *cache, void *object);
56 void kasan_init_slab_obj(struct kmem_cache *cache, const void *object);
57
58 void kasan_kmalloc_large(const void *ptr, size_t size, gfp_t flags);
59 void kasan_kfree_large(const void *ptr);
60 void kasan_poison_kfree(void *ptr);
61 void kasan_kmalloc(struct kmem_cache *s, const void *object, size_t size,
62 gfp_t flags);
63 void kasan_krealloc(const void *object, size_t new_size, gfp_t flags);
64
65 void kasan_slab_alloc(struct kmem_cache *s, void *object, gfp_t flags);
66 bool kasan_slab_free(struct kmem_cache *s, void *object);
67
68 struct kasan_cache {
69 int alloc_meta_offset;
70 int free_meta_offset;
71 };
72
73 int kasan_module_alloc(void *addr, size_t size);
74 void kasan_free_shadow(const struct vm_struct *vm);
75
76 size_t ksize(const void *);
kasan_unpoison_slab(const void * ptr)77 static inline void kasan_unpoison_slab(const void *ptr) { ksize(ptr); }
78 size_t kasan_metadata_size(struct kmem_cache *cache);
79
80 bool kasan_save_enable_multi_shot(void);
81 void kasan_restore_multi_shot(bool enabled);
82
83 #else /* CONFIG_KASAN */
84
kasan_unpoison_shadow(const void * address,size_t size)85 static inline void kasan_unpoison_shadow(const void *address, size_t size) {}
86
kasan_unpoison_task_stack(struct task_struct * task)87 static inline void kasan_unpoison_task_stack(struct task_struct *task) {}
kasan_unpoison_stack_above_sp_to(const void * watermark)88 static inline void kasan_unpoison_stack_above_sp_to(const void *watermark) {}
89
kasan_enable_current(void)90 static inline void kasan_enable_current(void) {}
kasan_disable_current(void)91 static inline void kasan_disable_current(void) {}
92
kasan_alloc_pages(struct page * page,unsigned int order)93 static inline void kasan_alloc_pages(struct page *page, unsigned int order) {}
kasan_free_pages(struct page * page,unsigned int order)94 static inline void kasan_free_pages(struct page *page, unsigned int order) {}
95
kasan_cache_create(struct kmem_cache * cache,size_t * size,unsigned long * flags)96 static inline void kasan_cache_create(struct kmem_cache *cache,
97 size_t *size,
98 unsigned long *flags) {}
kasan_cache_shrink(struct kmem_cache * cache)99 static inline void kasan_cache_shrink(struct kmem_cache *cache) {}
kasan_cache_shutdown(struct kmem_cache * cache)100 static inline void kasan_cache_shutdown(struct kmem_cache *cache) {}
101
kasan_poison_slab(struct page * page)102 static inline void kasan_poison_slab(struct page *page) {}
kasan_unpoison_object_data(struct kmem_cache * cache,void * object)103 static inline void kasan_unpoison_object_data(struct kmem_cache *cache,
104 void *object) {}
kasan_poison_object_data(struct kmem_cache * cache,void * object)105 static inline void kasan_poison_object_data(struct kmem_cache *cache,
106 void *object) {}
kasan_init_slab_obj(struct kmem_cache * cache,const void * object)107 static inline void kasan_init_slab_obj(struct kmem_cache *cache,
108 const void *object) {}
109
kasan_kmalloc_large(void * ptr,size_t size,gfp_t flags)110 static inline void kasan_kmalloc_large(void *ptr, size_t size, gfp_t flags) {}
kasan_kfree_large(const void * ptr)111 static inline void kasan_kfree_large(const void *ptr) {}
kasan_poison_kfree(void * ptr)112 static inline void kasan_poison_kfree(void *ptr) {}
kasan_kmalloc(struct kmem_cache * s,const void * object,size_t size,gfp_t flags)113 static inline void kasan_kmalloc(struct kmem_cache *s, const void *object,
114 size_t size, gfp_t flags) {}
kasan_krealloc(const void * object,size_t new_size,gfp_t flags)115 static inline void kasan_krealloc(const void *object, size_t new_size,
116 gfp_t flags) {}
117
kasan_slab_alloc(struct kmem_cache * s,void * object,gfp_t flags)118 static inline void kasan_slab_alloc(struct kmem_cache *s, void *object,
119 gfp_t flags) {}
kasan_slab_free(struct kmem_cache * s,void * object)120 static inline bool kasan_slab_free(struct kmem_cache *s, void *object)
121 {
122 return false;
123 }
124
kasan_module_alloc(void * addr,size_t size)125 static inline int kasan_module_alloc(void *addr, size_t size) { return 0; }
kasan_free_shadow(const struct vm_struct * vm)126 static inline void kasan_free_shadow(const struct vm_struct *vm) {}
127
kasan_unpoison_slab(const void * ptr)128 static inline void kasan_unpoison_slab(const void *ptr) { }
kasan_metadata_size(struct kmem_cache * cache)129 static inline size_t kasan_metadata_size(struct kmem_cache *cache) { return 0; }
130
131 #endif /* CONFIG_KASAN */
132
133 #endif /* LINUX_KASAN_H */
134