xref: /openbmc/linux/include/linux/kasan.h (revision 98ddec80)
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 #include <asm/kasan.h>
15 #include <asm/pgtable.h>
16 
17 extern unsigned char kasan_zero_page[PAGE_SIZE];
18 extern pte_t kasan_zero_pte[PTRS_PER_PTE];
19 extern pmd_t kasan_zero_pmd[PTRS_PER_PMD];
20 extern pud_t kasan_zero_pud[PTRS_PER_PUD];
21 extern p4d_t kasan_zero_p4d[MAX_PTRS_PER_P4D];
22 
23 void kasan_populate_zero_shadow(const void *shadow_start,
24 				const void *shadow_end);
25 
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, unsigned int *size,
47 			slab_flags_t *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(void *ptr, unsigned long ip);
58 void kasan_poison_kfree(void *ptr, unsigned long ip);
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, unsigned long ip);
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 *);
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 
83 static inline void kasan_unpoison_shadow(const void *address, size_t size) {}
84 
85 static inline void kasan_unpoison_task_stack(struct task_struct *task) {}
86 static inline void kasan_unpoison_stack_above_sp_to(const void *watermark) {}
87 
88 static inline void kasan_enable_current(void) {}
89 static inline void kasan_disable_current(void) {}
90 
91 static inline void kasan_alloc_pages(struct page *page, unsigned int order) {}
92 static inline void kasan_free_pages(struct page *page, unsigned int order) {}
93 
94 static inline void kasan_cache_create(struct kmem_cache *cache,
95 				      unsigned int *size,
96 				      slab_flags_t *flags) {}
97 static inline void kasan_cache_shrink(struct kmem_cache *cache) {}
98 static inline void kasan_cache_shutdown(struct kmem_cache *cache) {}
99 
100 static inline void kasan_poison_slab(struct page *page) {}
101 static inline void kasan_unpoison_object_data(struct kmem_cache *cache,
102 					void *object) {}
103 static inline void kasan_poison_object_data(struct kmem_cache *cache,
104 					void *object) {}
105 static inline void kasan_init_slab_obj(struct kmem_cache *cache,
106 				const void *object) {}
107 
108 static inline void kasan_kmalloc_large(void *ptr, size_t size, gfp_t flags) {}
109 static inline void kasan_kfree_large(void *ptr, unsigned long ip) {}
110 static inline void kasan_poison_kfree(void *ptr, unsigned long ip) {}
111 static inline void kasan_kmalloc(struct kmem_cache *s, const void *object,
112 				size_t size, gfp_t flags) {}
113 static inline void kasan_krealloc(const void *object, size_t new_size,
114 				 gfp_t flags) {}
115 
116 static inline void kasan_slab_alloc(struct kmem_cache *s, void *object,
117 				   gfp_t flags) {}
118 static inline bool kasan_slab_free(struct kmem_cache *s, void *object,
119 				   unsigned long ip)
120 {
121 	return false;
122 }
123 
124 static inline int kasan_module_alloc(void *addr, size_t size) { return 0; }
125 static inline void kasan_free_shadow(const struct vm_struct *vm) {}
126 
127 static inline void kasan_unpoison_slab(const void *ptr) { }
128 static inline size_t kasan_metadata_size(struct kmem_cache *cache) { return 0; }
129 
130 #endif /* CONFIG_KASAN */
131 
132 #endif /* LINUX_KASAN_H */
133