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);
47 void kasan_unpoison_stack_above_sp_to(const void *watermark);
49 void kasan_alloc_pages(struct page *page, unsigned int order);
50 void kasan_free_pages(struct page *page, unsigned int order);
52 void kasan_cache_create(struct kmem_cache *cache, size_t *size,
53 unsigned long *flags);
54 void kasan_cache_shrink(struct kmem_cache *cache);
55 void kasan_cache_destroy(struct kmem_cache *cache);
57 void kasan_poison_slab(struct page *page);
58 void kasan_unpoison_object_data(struct kmem_cache *cache, void *object);
59 void kasan_poison_object_data(struct kmem_cache *cache, void *object);
60 void kasan_init_slab_obj(struct kmem_cache *cache, const void *object);
62 void kasan_kmalloc_large(const void *ptr, size_t size, gfp_t flags);
63 void kasan_kfree_large(const void *ptr);
64 void kasan_poison_kfree(void *ptr);
65 void kasan_kmalloc(struct kmem_cache *s, const void *object, size_t size,
67 void kasan_krealloc(const void *object, size_t new_size, gfp_t flags);
69 void kasan_slab_alloc(struct kmem_cache *s, void *object, gfp_t flags);
70 bool kasan_slab_free(struct kmem_cache *s, void *object);
73 int alloc_meta_offset;
77 int kasan_module_alloc(void *addr, size_t size);
78 void kasan_free_shadow(const struct vm_struct *vm);
80 size_t ksize(const void *);
81 static inline void kasan_unpoison_slab(const void *ptr) { ksize(ptr); }
82 size_t kasan_metadata_size(struct kmem_cache *cache);
84 #else /* CONFIG_KASAN */
86 static inline void kasan_unpoison_shadow(const void *address, size_t size) {}
88 static inline void kasan_unpoison_task_stack(struct task_struct *task) {}
89 static inline void kasan_unpoison_stack_above_sp_to(const void *watermark) {}
91 static inline void kasan_enable_current(void) {}
92 static inline void kasan_disable_current(void) {}
94 static inline void kasan_alloc_pages(struct page *page, unsigned int order) {}
95 static inline void kasan_free_pages(struct page *page, unsigned int order) {}
97 static inline void kasan_cache_create(struct kmem_cache *cache,
99 unsigned long *flags) {}
100 static inline void kasan_cache_shrink(struct kmem_cache *cache) {}
101 static inline void kasan_cache_destroy(struct kmem_cache *cache) {}
103 static inline void kasan_poison_slab(struct page *page) {}
104 static inline void kasan_unpoison_object_data(struct kmem_cache *cache,
106 static inline void kasan_poison_object_data(struct kmem_cache *cache,
108 static inline void kasan_init_slab_obj(struct kmem_cache *cache,
109 const void *object) {}
111 static inline void kasan_kmalloc_large(void *ptr, size_t size, gfp_t flags) {}
112 static inline void kasan_kfree_large(const void *ptr) {}
113 static inline void kasan_poison_kfree(void *ptr) {}
114 static inline void kasan_kmalloc(struct kmem_cache *s, const void *object,
115 size_t size, gfp_t flags) {}
116 static inline void kasan_krealloc(const void *object, size_t new_size,
119 static inline void kasan_slab_alloc(struct kmem_cache *s, void *object,
121 static inline bool kasan_slab_free(struct kmem_cache *s, void *object)
126 static inline int kasan_module_alloc(void *addr, size_t size) { return 0; }
127 static inline void kasan_free_shadow(const struct vm_struct *vm) {}
129 static inline void kasan_unpoison_slab(const void *ptr) { }
130 static inline size_t kasan_metadata_size(struct kmem_cache *cache) { return 0; }
132 #endif /* CONFIG_KASAN */
134 #endif /* LINUX_KASAN_H */