1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __MM_KASAN_KASAN_H
3 #define __MM_KASAN_KASAN_H
5 #include <linux/kasan.h>
6 #include <linux/stackdepot.h>
8 #define KASAN_SHADOW_SCALE_SIZE (1UL << KASAN_SHADOW_SCALE_SHIFT)
9 #define KASAN_SHADOW_MASK (KASAN_SHADOW_SCALE_SIZE - 1)
11 #define KASAN_TAG_KERNEL 0xFF /* native kernel pointers tag */
12 #define KASAN_TAG_INVALID 0xFE /* inaccessible memory tag */
13 #define KASAN_TAG_MAX 0xFD /* maximum value for random tags */
15 #define KASAN_FREE_PAGE 0xFF /* page was freed */
16 #define KASAN_PAGE_REDZONE 0xFE /* redzone for kmalloc_large allocations */
17 #define KASAN_KMALLOC_REDZONE 0xFC /* redzone inside slub object */
18 #define KASAN_KMALLOC_FREE 0xFB /* object was freed (kmem_cache_free/kfree) */
19 #define KASAN_GLOBAL_REDZONE 0xFA /* redzone for global variable */
22 * Stack redzone shadow values
23 * (Those are compiler's ABI, don't change them)
25 #define KASAN_STACK_LEFT 0xF1
26 #define KASAN_STACK_MID 0xF2
27 #define KASAN_STACK_RIGHT 0xF3
28 #define KASAN_STACK_PARTIAL 0xF4
29 #define KASAN_USE_AFTER_SCOPE 0xF8
32 * alloca redzone shadow values
34 #define KASAN_ALLOCA_LEFT 0xCA
35 #define KASAN_ALLOCA_RIGHT 0xCB
37 #define KASAN_ALLOCA_REDZONE_SIZE 32
39 /* Don't break randconfig/all*config builds */
40 #ifndef KASAN_ABI_VERSION
41 #define KASAN_ABI_VERSION 1
44 struct kasan_access_info {
45 const void *access_addr;
46 const void *first_bad_addr;
52 /* The layout of struct dictated by compiler */
53 struct kasan_source_location {
59 /* The layout of struct dictated by compiler */
61 const void *beg; /* Address of the beginning of the global variable. */
62 size_t size; /* Size of the global variable. */
63 size_t size_with_redzone; /* Size of the variable + size of the red zone. 32 bytes aligned */
65 const void *module_name; /* Name of the module where the global variable is declared. */
66 unsigned long has_dynamic_init; /* This needed for C++ */
67 #if KASAN_ABI_VERSION >= 4
68 struct kasan_source_location *location;
70 #if KASAN_ABI_VERSION >= 5
76 * Structures to keep alloc and free tracks *
79 #define KASAN_STACK_DEPTH 64
83 depot_stack_handle_t stack;
86 struct kasan_alloc_meta {
87 struct kasan_track alloc_track;
88 struct kasan_track free_track;
92 struct qlist_node *next;
94 struct kasan_free_meta {
95 /* This field is used while the object is in the quarantine.
96 * Otherwise it might be used for the allocator freelist.
98 struct qlist_node quarantine_link;
101 struct kasan_alloc_meta *get_alloc_info(struct kmem_cache *cache,
103 struct kasan_free_meta *get_free_info(struct kmem_cache *cache,
106 static inline const void *kasan_shadow_to_mem(const void *shadow_addr)
108 return (void *)(((unsigned long)shadow_addr - KASAN_SHADOW_OFFSET)
109 << KASAN_SHADOW_SCALE_SHIFT);
112 static inline bool addr_has_shadow(const void *addr)
114 return (addr >= kasan_shadow_to_mem((void *)KASAN_SHADOW_START));
117 void kasan_poison_shadow(const void *address, size_t size, u8 value);
119 void check_memory_region(unsigned long addr, size_t size, bool write,
120 unsigned long ret_ip);
122 const char *get_bug_type(struct kasan_access_info *info);
124 void kasan_report(unsigned long addr, size_t size,
125 bool is_write, unsigned long ip);
126 void kasan_report_invalid_free(void *object, unsigned long ip);
128 #if defined(CONFIG_KASAN_GENERIC) && \
129 (defined(CONFIG_SLAB) || defined(CONFIG_SLUB))
130 void quarantine_put(struct kasan_free_meta *info, struct kmem_cache *cache);
131 void quarantine_reduce(void);
132 void quarantine_remove_cache(struct kmem_cache *cache);
134 static inline void quarantine_put(struct kasan_free_meta *info,
135 struct kmem_cache *cache) { }
136 static inline void quarantine_reduce(void) { }
137 static inline void quarantine_remove_cache(struct kmem_cache *cache) { }
140 #ifdef CONFIG_KASAN_SW_TAGS
146 static inline u8 random_tag(void)
153 #ifndef arch_kasan_set_tag
154 #define arch_kasan_set_tag(addr, tag) ((void *)(addr))
156 #ifndef arch_kasan_reset_tag
157 #define arch_kasan_reset_tag(addr) ((void *)(addr))
159 #ifndef arch_kasan_get_tag
160 #define arch_kasan_get_tag(addr) 0
163 #define set_tag(addr, tag) ((void *)arch_kasan_set_tag((addr), (tag)))
164 #define reset_tag(addr) ((void *)arch_kasan_reset_tag(addr))
165 #define get_tag(addr) arch_kasan_get_tag(addr)
168 * Exported functions for interfaces called from assembly or from generated
169 * code. Declarations here to avoid warning about missing declarations.
171 asmlinkage void kasan_unpoison_task_stack_below(const void *watermark);
172 void __asan_register_globals(struct kasan_global *globals, size_t size);
173 void __asan_unregister_globals(struct kasan_global *globals, size_t size);
174 void __asan_loadN(unsigned long addr, size_t size);
175 void __asan_storeN(unsigned long addr, size_t size);
176 void __asan_handle_no_return(void);
177 void __asan_poison_stack_memory(const void *addr, size_t size);
178 void __asan_unpoison_stack_memory(const void *addr, size_t size);
179 void __asan_alloca_poison(unsigned long addr, size_t size);
180 void __asan_allocas_unpoison(const void *stack_top, const void *stack_bottom);
182 void __asan_load1(unsigned long addr);
183 void __asan_store1(unsigned long addr);
184 void __asan_load2(unsigned long addr);
185 void __asan_store2(unsigned long addr);
186 void __asan_load4(unsigned long addr);
187 void __asan_store4(unsigned long addr);
188 void __asan_load8(unsigned long addr);
189 void __asan_store8(unsigned long addr);
190 void __asan_load16(unsigned long addr);
191 void __asan_store16(unsigned long addr);
193 void __asan_load1_noabort(unsigned long addr);
194 void __asan_store1_noabort(unsigned long addr);
195 void __asan_load2_noabort(unsigned long addr);
196 void __asan_store2_noabort(unsigned long addr);
197 void __asan_load4_noabort(unsigned long addr);
198 void __asan_store4_noabort(unsigned long addr);
199 void __asan_load8_noabort(unsigned long addr);
200 void __asan_store8_noabort(unsigned long addr);
201 void __asan_load16_noabort(unsigned long addr);
202 void __asan_store16_noabort(unsigned long addr);
204 void __asan_set_shadow_00(const void *addr, size_t size);
205 void __asan_set_shadow_f1(const void *addr, size_t size);
206 void __asan_set_shadow_f2(const void *addr, size_t size);
207 void __asan_set_shadow_f3(const void *addr, size_t size);
208 void __asan_set_shadow_f5(const void *addr, size_t size);
209 void __asan_set_shadow_f8(const void *addr, size_t size);