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#include <asm/kasan.h>
15#include <asm/pgtable.h>
16
17extern unsigned char kasan_early_shadow_page[PAGE_SIZE];
18extern pte_t kasan_early_shadow_pte[PTRS_PER_PTE];
19extern pmd_t kasan_early_shadow_pmd[PTRS_PER_PMD];
20extern pud_t kasan_early_shadow_pud[PTRS_PER_PUD];
21extern p4d_t kasan_early_shadow_p4d[MAX_PTRS_PER_P4D];
22
23int kasan_populate_early_shadow(const void *shadow_start,
24 const void *shadow_end);
25
26static 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() */
33extern void kasan_enable_current(void);
34
35/* Disable reporting bugs for current task */
36extern void kasan_disable_current(void);
37
38void kasan_unpoison_shadow(const void *address, size_t size);
39
40void kasan_unpoison_task_stack(struct task_struct *task);
41void kasan_unpoison_stack_above_sp_to(const void *watermark);
42
43void kasan_alloc_pages(struct page *page, unsigned int order);
44void kasan_free_pages(struct page *page, unsigned int order);
45
46void kasan_cache_create(struct kmem_cache *cache, unsigned int *size,
47 slab_flags_t *flags);
48
49void kasan_poison_slab(struct page *page);
50void kasan_unpoison_object_data(struct kmem_cache *cache, void *object);
51void kasan_poison_object_data(struct kmem_cache *cache, void *object);
52void * __must_check kasan_init_slab_obj(struct kmem_cache *cache,
53 const void *object);
54
55void * __must_check kasan_kmalloc_large(const void *ptr, size_t size,
56 gfp_t flags);
57void kasan_kfree_large(void *ptr, unsigned long ip);
58void kasan_poison_kfree(void *ptr, unsigned long ip);
59void * __must_check kasan_kmalloc(struct kmem_cache *s, const void *object,
60 size_t size, gfp_t flags);
61void * __must_check kasan_krealloc(const void *object, size_t new_size,
62 gfp_t flags);
63
64void * __must_check kasan_slab_alloc(struct kmem_cache *s, void *object,
65 gfp_t flags);
66bool kasan_slab_free(struct kmem_cache *s, void *object, unsigned long ip);
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
76int kasan_add_zero_shadow(void *start, unsigned long size);
77void kasan_remove_zero_shadow(void *start, unsigned long size);
78
79size_t ksize(const void *);
80static inline void kasan_unpoison_slab(const void *ptr) { ksize(ptr); }
81size_t kasan_metadata_size(struct kmem_cache *cache);
82
83bool kasan_save_enable_multi_shot(void);
84void kasan_restore_multi_shot(bool enabled);
85
86#else /* CONFIG_KASAN */
87
88static inline void kasan_unpoison_shadow(const void *address, size_t size) {}
89
90static inline void kasan_unpoison_task_stack(struct task_struct *task) {}
91static inline void kasan_unpoison_stack_above_sp_to(const void *watermark) {}
92
93static inline void kasan_enable_current(void) {}
94static inline void kasan_disable_current(void) {}
95
96static inline void kasan_alloc_pages(struct page *page, unsigned int order) {}
97static inline void kasan_free_pages(struct page *page, unsigned int order) {}
98
99static inline void kasan_cache_create(struct kmem_cache *cache,
100 unsigned int *size,
101 slab_flags_t *flags) {}
102
103static inline void kasan_poison_slab(struct page *page) {}
104static inline void kasan_unpoison_object_data(struct kmem_cache *cache,
105 void *object) {}
106static inline void kasan_poison_object_data(struct kmem_cache *cache,
107 void *object) {}
108static inline void *kasan_init_slab_obj(struct kmem_cache *cache,
109 const void *object)
110{
111 return (void *)object;
112}
113
114static inline void *kasan_kmalloc_large(void *ptr, size_t size, gfp_t flags)
115{
116 return ptr;
117}
118static inline void kasan_kfree_large(void *ptr, unsigned long ip) {}
119static inline void kasan_poison_kfree(void *ptr, unsigned long ip) {}
120static inline void *kasan_kmalloc(struct kmem_cache *s, const void *object,
121 size_t size, gfp_t flags)
122{
123 return (void *)object;
124}
125static inline void *kasan_krealloc(const void *object, size_t new_size,
126 gfp_t flags)
127{
128 return (void *)object;
129}
130
131static inline void *kasan_slab_alloc(struct kmem_cache *s, void *object,
132 gfp_t flags)
133{
134 return object;
135}
136static inline bool kasan_slab_free(struct kmem_cache *s, void *object,
137 unsigned long ip)
138{
139 return false;
140}
141
142static inline int kasan_module_alloc(void *addr, size_t size) { return 0; }
143static inline void kasan_free_shadow(const struct vm_struct *vm) {}
144
145static inline int kasan_add_zero_shadow(void *start, unsigned long size)
146{
147 return 0;
148}
149static inline void kasan_remove_zero_shadow(void *start,
150 unsigned long size)
151{}
152
153static inline void kasan_unpoison_slab(const void *ptr) { }
154static inline size_t kasan_metadata_size(struct kmem_cache *cache) { return 0; }
155
156#endif /* CONFIG_KASAN */
157
158#ifdef CONFIG_KASAN_GENERIC
159
160#define KASAN_SHADOW_INIT 0
161
162void kasan_cache_shrink(struct kmem_cache *cache);
163void kasan_cache_shutdown(struct kmem_cache *cache);
164
165#else /* CONFIG_KASAN_GENERIC */
166
167static inline void kasan_cache_shrink(struct kmem_cache *cache) {}
168static inline void kasan_cache_shutdown(struct kmem_cache *cache) {}
169
170#endif /* CONFIG_KASAN_GENERIC */
171
172#ifdef CONFIG_KASAN_SW_TAGS
173
174#define KASAN_SHADOW_INIT 0xFF
175
176void kasan_init_tags(void);
177
178void *kasan_reset_tag(const void *addr);
179
180void kasan_report(unsigned long addr, size_t size,
181 bool is_write, unsigned long ip);
182
183#else /* CONFIG_KASAN_SW_TAGS */
184
185static inline void kasan_init_tags(void) { }
186
187static inline void *kasan_reset_tag(const void *addr)
188{
189 return (void *)addr;
190}
191
192#endif /* CONFIG_KASAN_SW_TAGS */
193
194#endif /* LINUX_KASAN_H */
195