4 #include <linux/sched.h>
5 #include <linux/types.h>
13 #define KASAN_SHADOW_SCALE_SHIFT 3
15 #include <asm/kasan.h>
16 #include <asm/pgtable.h>
18 extern unsigned char kasan_zero_page[PAGE_SIZE];
19 extern pte_t kasan_zero_pte[PTRS_PER_PTE];
20 extern pmd_t kasan_zero_pmd[PTRS_PER_PMD];
21 extern pud_t kasan_zero_pud[PTRS_PER_PUD];
23 void kasan_populate_zero_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 static inline void kasan_enable_current(void)
35 current->kasan_depth++;
38 /* Disable reporting bugs for current task */
39 static inline void kasan_disable_current(void)
41 current->kasan_depth--;
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, size_t *size,
52 unsigned long *flags);
53 void kasan_cache_shrink(struct kmem_cache *cache);
54 void kasan_cache_destroy(struct kmem_cache *cache);
56 void kasan_poison_slab(struct page *page);
57 void kasan_unpoison_object_data(struct kmem_cache *cache, void *object);
58 void kasan_poison_object_data(struct kmem_cache *cache, void *object);
60 void kasan_kmalloc_large(const void *ptr, size_t size, gfp_t flags);
61 void kasan_kfree_large(const void *ptr);
62 void kasan_kfree(void *ptr);
63 void kasan_kmalloc(struct kmem_cache *s, const void *object, size_t size,
65 void kasan_krealloc(const void *object, size_t new_size, gfp_t flags);
67 void kasan_slab_alloc(struct kmem_cache *s, void *object, gfp_t flags);
68 bool kasan_slab_free(struct kmem_cache *s, void *object);
69 void kasan_poison_slab_free(struct kmem_cache *s, void *object);
72 int alloc_meta_offset;
76 int kasan_module_alloc(void *addr, size_t size);
77 void kasan_free_shadow(const struct vm_struct *vm);
79 #else /* CONFIG_KASAN */
81 static inline void kasan_unpoison_shadow(const void *address, size_t size) {}
83 static inline void kasan_unpoison_task_stack(struct task_struct *task) {}
85 static inline void kasan_enable_current(void) {}
86 static inline void kasan_disable_current(void) {}
88 static inline void kasan_alloc_pages(struct page *page, unsigned int order) {}
89 static inline void kasan_free_pages(struct page *page, unsigned int order) {}
91 static inline void kasan_cache_create(struct kmem_cache *cache,
93 unsigned long *flags) {}
94 static inline void kasan_cache_shrink(struct kmem_cache *cache) {}
95 static inline void kasan_cache_destroy(struct kmem_cache *cache) {}
97 static inline void kasan_poison_slab(struct page *page) {}
98 static inline void kasan_unpoison_object_data(struct kmem_cache *cache,
100 static inline void kasan_poison_object_data(struct kmem_cache *cache,
103 static inline void kasan_kmalloc_large(void *ptr, size_t size, gfp_t flags) {}
104 static inline void kasan_kfree_large(const void *ptr) {}
105 static inline void kasan_kfree(void *ptr) {}
106 static inline void kasan_kmalloc(struct kmem_cache *s, const void *object,
107 size_t size, gfp_t flags) {}
108 static inline void kasan_krealloc(const void *object, size_t new_size,
111 static inline void kasan_slab_alloc(struct kmem_cache *s, void *object,
113 static inline bool kasan_slab_free(struct kmem_cache *s, void *object)
117 static inline void kasan_poison_slab_free(struct kmem_cache *s, void *object) {}
119 static inline int kasan_module_alloc(void *addr, size_t size) { return 0; }
120 static inline void kasan_free_shadow(const struct vm_struct *vm) {}
122 #endif /* CONFIG_KASAN */
124 #endif /* LINUX_KASAN_H */