1 /* SPDX-License-Identifier: GPL-2.0 */
5 #include <linux/types.h>
14 #include <asm/kasan.h>
15 #include <asm/pgtable.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
);
41 void kasan_unpoison_stack_above_sp_to(const void *watermark
);
43 void kasan_alloc_pages(struct page
*page
, unsigned int order
);
44 void kasan_free_pages(struct page
*page
, unsigned int order
);
46 void kasan_cache_create(struct kmem_cache
*cache
, unsigned int *size
,
49 void kasan_poison_slab(struct page
*page
);
50 void kasan_unpoison_object_data(struct kmem_cache
*cache
, void *object
);
51 void kasan_poison_object_data(struct kmem_cache
*cache
, void *object
);
52 void * __must_check
kasan_init_slab_obj(struct kmem_cache
*cache
,
55 void * __must_check
kasan_kmalloc_large(const void *ptr
, size_t size
,
57 void kasan_kfree_large(void *ptr
, unsigned long ip
);
58 void kasan_poison_kfree(void *ptr
, unsigned long ip
);
59 void * __must_check
kasan_kmalloc(struct kmem_cache
*s
, const void *object
,
60 size_t size
, gfp_t flags
);
61 void * __must_check
kasan_krealloc(const void *object
, size_t new_size
,
64 void * __must_check
kasan_slab_alloc(struct kmem_cache
*s
, void *object
,
66 bool kasan_slab_free(struct kmem_cache
*s
, void *object
, unsigned long ip
);
69 int alloc_meta_offset
;
73 int kasan_module_alloc(void *addr
, size_t size
);
74 void kasan_free_shadow(const struct vm_struct
*vm
);
76 int kasan_add_zero_shadow(void *start
, unsigned long size
);
77 void kasan_remove_zero_shadow(void *start
, unsigned long size
);
79 size_t ksize(const void *);
80 static inline void kasan_unpoison_slab(const void *ptr
) { ksize(ptr
); }
81 size_t kasan_metadata_size(struct kmem_cache
*cache
);
83 bool kasan_save_enable_multi_shot(void);
84 void kasan_restore_multi_shot(bool enabled
);
86 #else /* CONFIG_KASAN */
88 static inline void kasan_unpoison_shadow(const void *address
, size_t size
) {}
90 static inline void kasan_unpoison_task_stack(struct task_struct
*task
) {}
91 static inline void kasan_unpoison_stack_above_sp_to(const void *watermark
) {}
93 static inline void kasan_enable_current(void) {}
94 static inline void kasan_disable_current(void) {}
96 static inline void kasan_alloc_pages(struct page
*page
, unsigned int order
) {}
97 static inline void kasan_free_pages(struct page
*page
, unsigned int order
) {}
99 static inline void kasan_cache_create(struct kmem_cache
*cache
,
101 slab_flags_t
*flags
) {}
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
,
111 return (void *)object
;
114 static inline void *kasan_kmalloc_large(void *ptr
, size_t size
, gfp_t flags
)
118 static inline void kasan_kfree_large(void *ptr
, unsigned long ip
) {}
119 static inline void kasan_poison_kfree(void *ptr
, unsigned long ip
) {}
120 static inline void *kasan_kmalloc(struct kmem_cache
*s
, const void *object
,
121 size_t size
, gfp_t flags
)
123 return (void *)object
;
125 static inline void *kasan_krealloc(const void *object
, size_t new_size
,
128 return (void *)object
;
131 static inline void *kasan_slab_alloc(struct kmem_cache
*s
, void *object
,
136 static inline bool kasan_slab_free(struct kmem_cache
*s
, void *object
,
142 static inline int kasan_module_alloc(void *addr
, size_t size
) { return 0; }
143 static inline void kasan_free_shadow(const struct vm_struct
*vm
) {}
145 static inline int kasan_add_zero_shadow(void *start
, unsigned long size
)
149 static inline void kasan_remove_zero_shadow(void *start
,
153 static inline void kasan_unpoison_slab(const void *ptr
) { }
154 static inline size_t kasan_metadata_size(struct kmem_cache
*cache
) { return 0; }
156 #endif /* CONFIG_KASAN */
158 #ifdef CONFIG_KASAN_GENERIC
160 #define KASAN_SHADOW_INIT 0
162 void kasan_cache_shrink(struct kmem_cache
*cache
);
163 void kasan_cache_shutdown(struct kmem_cache
*cache
);
165 #else /* CONFIG_KASAN_GENERIC */
167 static inline void kasan_cache_shrink(struct kmem_cache
*cache
) {}
168 static inline void kasan_cache_shutdown(struct kmem_cache
*cache
) {}
170 #endif /* CONFIG_KASAN_GENERIC */
172 #ifdef CONFIG_KASAN_SW_TAGS
174 #define KASAN_SHADOW_INIT 0xFF
176 void kasan_init_tags(void);
178 void *kasan_reset_tag(const void *addr
);
180 void kasan_report(unsigned long addr
, size_t size
,
181 bool is_write
, unsigned long ip
);
183 #else /* CONFIG_KASAN_SW_TAGS */
185 static inline void kasan_init_tags(void) { }
187 static inline void *kasan_reset_tag(const void *addr
)
192 #endif /* CONFIG_KASAN_SW_TAGS */
194 #endif /* LINUX_KASAN_H */