1 /* SPDX-License-Identifier: GPL-2.0 */
5 #include <linux/types.h>
14 #include <linux/pgtable.h>
15 #include <asm/kasan.h>
17 /* kasan_data struct is used in KUnit tests for KASAN expected failures */
18 struct kunit_kasan_expectation {
23 extern unsigned char kasan_early_shadow_page[PAGE_SIZE];
24 extern pte_t kasan_early_shadow_pte[PTRS_PER_PTE];
25 extern pmd_t kasan_early_shadow_pmd[PTRS_PER_PMD];
26 extern pud_t kasan_early_shadow_pud[PTRS_PER_PUD];
27 extern p4d_t kasan_early_shadow_p4d[MAX_PTRS_PER_P4D];
29 int kasan_populate_early_shadow(const void *shadow_start,
30 const void *shadow_end);
32 static inline void *kasan_mem_to_shadow(const void *addr)
34 return (void *)((unsigned long)addr >> KASAN_SHADOW_SCALE_SHIFT)
35 + KASAN_SHADOW_OFFSET;
38 /* Enable reporting bugs after kasan_disable_current() */
39 extern void kasan_enable_current(void);
41 /* Disable reporting bugs for current task */
42 extern void kasan_disable_current(void);
44 void kasan_unpoison_shadow(const void *address, size_t size);
46 void kasan_unpoison_task_stack(struct task_struct *task);
48 void kasan_alloc_pages(struct page *page, unsigned int order);
49 void kasan_free_pages(struct page *page, unsigned int order);
51 void kasan_cache_create(struct kmem_cache *cache, unsigned int *size,
54 void kasan_poison_slab(struct page *page);
55 void kasan_unpoison_object_data(struct kmem_cache *cache, void *object);
56 void kasan_poison_object_data(struct kmem_cache *cache, void *object);
57 void * __must_check kasan_init_slab_obj(struct kmem_cache *cache,
60 void * __must_check kasan_kmalloc_large(const void *ptr, size_t size,
62 void kasan_kfree_large(void *ptr, unsigned long ip);
63 void kasan_poison_kfree(void *ptr, unsigned long ip);
64 void * __must_check kasan_kmalloc(struct kmem_cache *s, const void *object,
65 size_t size, gfp_t flags);
66 void * __must_check kasan_krealloc(const void *object, size_t new_size,
69 void * __must_check kasan_slab_alloc(struct kmem_cache *s, void *object,
71 bool kasan_slab_free(struct kmem_cache *s, void *object, unsigned long ip);
74 int alloc_meta_offset;
79 * These functions provide a special case to support backing module
80 * allocations with real shadow memory. With KASAN vmalloc, the special
81 * case is unnecessary, as the work is handled in the generic case.
83 #ifndef CONFIG_KASAN_VMALLOC
84 int kasan_module_alloc(void *addr, size_t size);
85 void kasan_free_shadow(const struct vm_struct *vm);
87 static inline int kasan_module_alloc(void *addr, size_t size) { return 0; }
88 static inline void kasan_free_shadow(const struct vm_struct *vm) {}
91 int kasan_add_zero_shadow(void *start, unsigned long size);
92 void kasan_remove_zero_shadow(void *start, unsigned long size);
94 size_t __ksize(const void *);
95 static inline void kasan_unpoison_slab(const void *ptr)
97 kasan_unpoison_shadow(ptr, __ksize(ptr));
99 size_t kasan_metadata_size(struct kmem_cache *cache);
101 bool kasan_save_enable_multi_shot(void);
102 void kasan_restore_multi_shot(bool enabled);
104 #else /* CONFIG_KASAN */
106 static inline void kasan_unpoison_shadow(const void *address, size_t size) {}
108 static inline void kasan_unpoison_task_stack(struct task_struct *task) {}
110 static inline void kasan_enable_current(void) {}
111 static inline void kasan_disable_current(void) {}
113 static inline void kasan_alloc_pages(struct page *page, unsigned int order) {}
114 static inline void kasan_free_pages(struct page *page, unsigned int order) {}
116 static inline void kasan_cache_create(struct kmem_cache *cache,
118 slab_flags_t *flags) {}
120 static inline void kasan_poison_slab(struct page *page) {}
121 static inline void kasan_unpoison_object_data(struct kmem_cache *cache,
123 static inline void kasan_poison_object_data(struct kmem_cache *cache,
125 static inline void *kasan_init_slab_obj(struct kmem_cache *cache,
128 return (void *)object;
131 static inline void *kasan_kmalloc_large(void *ptr, size_t size, gfp_t flags)
135 static inline void kasan_kfree_large(void *ptr, unsigned long ip) {}
136 static inline void kasan_poison_kfree(void *ptr, unsigned long ip) {}
137 static inline void *kasan_kmalloc(struct kmem_cache *s, const void *object,
138 size_t size, gfp_t flags)
140 return (void *)object;
142 static inline void *kasan_krealloc(const void *object, size_t new_size,
145 return (void *)object;
148 static inline void *kasan_slab_alloc(struct kmem_cache *s, void *object,
153 static inline bool kasan_slab_free(struct kmem_cache *s, void *object,
159 static inline int kasan_module_alloc(void *addr, size_t size) { return 0; }
160 static inline void kasan_free_shadow(const struct vm_struct *vm) {}
162 static inline int kasan_add_zero_shadow(void *start, unsigned long size)
166 static inline void kasan_remove_zero_shadow(void *start,
170 static inline void kasan_unpoison_slab(const void *ptr) { }
171 static inline size_t kasan_metadata_size(struct kmem_cache *cache) { return 0; }
173 #endif /* CONFIG_KASAN */
175 #ifdef CONFIG_KASAN_GENERIC
177 #define KASAN_SHADOW_INIT 0
179 void kasan_cache_shrink(struct kmem_cache *cache);
180 void kasan_cache_shutdown(struct kmem_cache *cache);
181 void kasan_record_aux_stack(void *ptr);
183 #else /* CONFIG_KASAN_GENERIC */
185 static inline void kasan_cache_shrink(struct kmem_cache *cache) {}
186 static inline void kasan_cache_shutdown(struct kmem_cache *cache) {}
187 static inline void kasan_record_aux_stack(void *ptr) {}
189 #endif /* CONFIG_KASAN_GENERIC */
191 #ifdef CONFIG_KASAN_SW_TAGS
193 #define KASAN_SHADOW_INIT 0xFF
195 void kasan_init_tags(void);
197 void *kasan_reset_tag(const void *addr);
199 bool kasan_report(unsigned long addr, size_t size,
200 bool is_write, unsigned long ip);
202 #else /* CONFIG_KASAN_SW_TAGS */
204 static inline void kasan_init_tags(void) { }
206 static inline void *kasan_reset_tag(const void *addr)
211 #endif /* CONFIG_KASAN_SW_TAGS */
213 #ifdef CONFIG_KASAN_VMALLOC
214 int kasan_populate_vmalloc(unsigned long addr, unsigned long size);
215 void kasan_poison_vmalloc(const void *start, unsigned long size);
216 void kasan_unpoison_vmalloc(const void *start, unsigned long size);
217 void kasan_release_vmalloc(unsigned long start, unsigned long end,
218 unsigned long free_region_start,
219 unsigned long free_region_end);
221 static inline int kasan_populate_vmalloc(unsigned long start,
227 static inline void kasan_poison_vmalloc(const void *start, unsigned long size)
229 static inline void kasan_unpoison_vmalloc(const void *start, unsigned long size)
231 static inline void kasan_release_vmalloc(unsigned long start,
233 unsigned long free_region_start,
234 unsigned long free_region_end) {}
237 #ifdef CONFIG_KASAN_INLINE
238 void kasan_non_canonical_hook(unsigned long addr);
239 #else /* CONFIG_KASAN_INLINE */
240 static inline void kasan_non_canonical_hook(unsigned long addr) { }
241 #endif /* CONFIG_KASAN_INLINE */
243 #endif /* LINUX_KASAN_H */