1 /* SPDX-License-Identifier: GPL-2.0 */
5 #include <linux/types.h>
14 #include <linux/pgtable.h>
15 #include <asm/kasan.h>
17 extern unsigned char kasan_early_shadow_page[PAGE_SIZE];
18 extern pte_t kasan_early_shadow_pte[PTRS_PER_PTE];
19 extern pmd_t kasan_early_shadow_pmd[PTRS_PER_PMD];
20 extern pud_t kasan_early_shadow_pud[PTRS_PER_PUD];
21 extern p4d_t kasan_early_shadow_p4d[MAX_PTRS_PER_P4D];
23 int kasan_populate_early_shadow(const void *shadow_start,
24 const void *shadow_end);
26 static inline void *kasan_mem_to_shadow(const void *addr)
28 return (void *)((unsigned long)addr >> KASAN_SHADOW_SCALE_SHIFT)
29 + KASAN_SHADOW_OFFSET;
32 /* Enable reporting bugs after kasan_disable_current() */
33 extern void kasan_enable_current(void);
35 /* Disable reporting bugs for current task */
36 extern void kasan_disable_current(void);
38 void kasan_unpoison_shadow(const void *address, size_t size);
40 void kasan_unpoison_task_stack(struct task_struct *task);
42 void kasan_alloc_pages(struct page *page, unsigned int order);
43 void kasan_free_pages(struct page *page, unsigned int order);
45 void kasan_cache_create(struct kmem_cache *cache, unsigned int *size,
48 void kasan_poison_slab(struct page *page);
49 void kasan_unpoison_object_data(struct kmem_cache *cache, void *object);
50 void kasan_poison_object_data(struct kmem_cache *cache, void *object);
51 void * __must_check kasan_init_slab_obj(struct kmem_cache *cache,
54 void * __must_check kasan_kmalloc_large(const void *ptr, size_t size,
56 void kasan_kfree_large(void *ptr, unsigned long ip);
57 void kasan_poison_kfree(void *ptr, unsigned long ip);
58 void * __must_check kasan_kmalloc(struct kmem_cache *s, const void *object,
59 size_t size, gfp_t flags);
60 void * __must_check kasan_krealloc(const void *object, size_t new_size,
63 void * __must_check kasan_slab_alloc(struct kmem_cache *s, void *object,
65 bool kasan_slab_free(struct kmem_cache *s, void *object, unsigned long ip);
68 int alloc_meta_offset;
73 * These functions provide a special case to support backing module
74 * allocations with real shadow memory. With KASAN vmalloc, the special
75 * case is unnecessary, as the work is handled in the generic case.
77 #ifndef CONFIG_KASAN_VMALLOC
78 int kasan_module_alloc(void *addr, size_t size);
79 void kasan_free_shadow(const struct vm_struct *vm);
81 static inline int kasan_module_alloc(void *addr, size_t size) { return 0; }
82 static inline void kasan_free_shadow(const struct vm_struct *vm) {}
85 int kasan_add_zero_shadow(void *start, unsigned long size);
86 void kasan_remove_zero_shadow(void *start, unsigned long size);
88 size_t __ksize(const void *);
89 static inline void kasan_unpoison_slab(const void *ptr)
91 kasan_unpoison_shadow(ptr, __ksize(ptr));
93 size_t kasan_metadata_size(struct kmem_cache *cache);
95 bool kasan_save_enable_multi_shot(void);
96 void kasan_restore_multi_shot(bool enabled);
98 #else /* CONFIG_KASAN */
100 static inline void kasan_unpoison_shadow(const void *address, size_t size) {}
102 static inline void kasan_unpoison_task_stack(struct task_struct *task) {}
104 static inline void kasan_enable_current(void) {}
105 static inline void kasan_disable_current(void) {}
107 static inline void kasan_alloc_pages(struct page *page, unsigned int order) {}
108 static inline void kasan_free_pages(struct page *page, unsigned int order) {}
110 static inline void kasan_cache_create(struct kmem_cache *cache,
112 slab_flags_t *flags) {}
114 static inline void kasan_poison_slab(struct page *page) {}
115 static inline void kasan_unpoison_object_data(struct kmem_cache *cache,
117 static inline void kasan_poison_object_data(struct kmem_cache *cache,
119 static inline void *kasan_init_slab_obj(struct kmem_cache *cache,
122 return (void *)object;
125 static inline void *kasan_kmalloc_large(void *ptr, size_t size, gfp_t flags)
129 static inline void kasan_kfree_large(void *ptr, unsigned long ip) {}
130 static inline void kasan_poison_kfree(void *ptr, unsigned long ip) {}
131 static inline void *kasan_kmalloc(struct kmem_cache *s, const void *object,
132 size_t size, gfp_t flags)
134 return (void *)object;
136 static inline void *kasan_krealloc(const void *object, size_t new_size,
139 return (void *)object;
142 static inline void *kasan_slab_alloc(struct kmem_cache *s, void *object,
147 static inline bool kasan_slab_free(struct kmem_cache *s, void *object,
153 static inline int kasan_module_alloc(void *addr, size_t size) { return 0; }
154 static inline void kasan_free_shadow(const struct vm_struct *vm) {}
156 static inline int kasan_add_zero_shadow(void *start, unsigned long size)
160 static inline void kasan_remove_zero_shadow(void *start,
164 static inline void kasan_unpoison_slab(const void *ptr) { }
165 static inline size_t kasan_metadata_size(struct kmem_cache *cache) { return 0; }
167 #endif /* CONFIG_KASAN */
169 #ifdef CONFIG_KASAN_GENERIC
171 #define KASAN_SHADOW_INIT 0
173 void kasan_cache_shrink(struct kmem_cache *cache);
174 void kasan_cache_shutdown(struct kmem_cache *cache);
175 void kasan_record_aux_stack(void *ptr);
177 #else /* CONFIG_KASAN_GENERIC */
179 static inline void kasan_cache_shrink(struct kmem_cache *cache) {}
180 static inline void kasan_cache_shutdown(struct kmem_cache *cache) {}
181 static inline void kasan_record_aux_stack(void *ptr) {}
183 #endif /* CONFIG_KASAN_GENERIC */
185 #ifdef CONFIG_KASAN_SW_TAGS
187 #define KASAN_SHADOW_INIT 0xFF
189 void kasan_init_tags(void);
191 void *kasan_reset_tag(const void *addr);
193 bool kasan_report(unsigned long addr, size_t size,
194 bool is_write, unsigned long ip);
196 #else /* CONFIG_KASAN_SW_TAGS */
198 static inline void kasan_init_tags(void) { }
200 static inline void *kasan_reset_tag(const void *addr)
205 #endif /* CONFIG_KASAN_SW_TAGS */
207 #ifdef CONFIG_KASAN_VMALLOC
208 int kasan_populate_vmalloc(unsigned long addr, unsigned long size);
209 void kasan_poison_vmalloc(const void *start, unsigned long size);
210 void kasan_unpoison_vmalloc(const void *start, unsigned long size);
211 void kasan_release_vmalloc(unsigned long start, unsigned long end,
212 unsigned long free_region_start,
213 unsigned long free_region_end);
215 static inline int kasan_populate_vmalloc(unsigned long start,
221 static inline void kasan_poison_vmalloc(const void *start, unsigned long size)
223 static inline void kasan_unpoison_vmalloc(const void *start, unsigned long size)
225 static inline void kasan_release_vmalloc(unsigned long start,
227 unsigned long free_region_start,
228 unsigned long free_region_end) {}
231 #ifdef CONFIG_KASAN_INLINE
232 void kasan_non_canonical_hook(unsigned long addr);
233 #else /* CONFIG_KASAN_INLINE */
234 static inline void kasan_non_canonical_hook(unsigned long addr) { }
235 #endif /* CONFIG_KASAN_INLINE */
237 #endif /* LINUX_KASAN_H */