Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
0b24becc AR |
2 | #ifndef __MM_KASAN_KASAN_H |
3 | #define __MM_KASAN_KASAN_H | |
4 | ||
7bc0584e | 5 | #include <linux/atomic.h> |
0b24becc | 6 | #include <linux/kasan.h> |
82868247 | 7 | #include <linux/kasan-tags.h> |
2b830526 | 8 | #include <linux/kfence.h> |
cd11016e | 9 | #include <linux/stackdepot.h> |
0b24becc | 10 | |
7ebfce33 | 11 | #if defined(CONFIG_KASAN_SW_TAGS) || defined(CONFIG_KASAN_HW_TAGS) |
8f7b5054 | 12 | |
8028caac | 13 | #include <linux/static_key.h> |
7ebfce33 AK |
14 | |
15 | DECLARE_STATIC_KEY_TRUE(kasan_flag_stacktrace); | |
16 | ||
17 | static inline bool kasan_stack_collection_enabled(void) | |
18 | { | |
19 | return static_branch_unlikely(&kasan_flag_stacktrace); | |
20 | } | |
21 | ||
22 | #else /* CONFIG_KASAN_SW_TAGS || CONFIG_KASAN_HW_TAGS */ | |
23 | ||
24 | static inline bool kasan_stack_collection_enabled(void) | |
25 | { | |
26 | return true; | |
27 | } | |
28 | ||
29 | #endif /* CONFIG_KASAN_SW_TAGS || CONFIG_KASAN_HW_TAGS */ | |
30 | ||
31 | #ifdef CONFIG_KASAN_HW_TAGS | |
32 | ||
77a63c69 | 33 | #include "../slab.h" |
8f7b5054 | 34 | |
551b2bcb | 35 | DECLARE_STATIC_KEY_TRUE(kasan_flag_vmalloc); |
2d27e585 VF |
36 | |
37 | enum kasan_mode { | |
38 | KASAN_MODE_SYNC, | |
39 | KASAN_MODE_ASYNC, | |
40 | KASAN_MODE_ASYMM, | |
41 | }; | |
42 | ||
43 | extern enum kasan_mode kasan_mode __ro_after_init; | |
8f7b5054 | 44 | |
551b2bcb AK |
45 | static inline bool kasan_vmalloc_enabled(void) |
46 | { | |
47 | return static_branch_likely(&kasan_flag_vmalloc); | |
48 | } | |
49 | ||
2d27e585 VF |
50 | static inline bool kasan_async_fault_possible(void) |
51 | { | |
52 | return kasan_mode == KASAN_MODE_ASYNC || kasan_mode == KASAN_MODE_ASYMM; | |
53 | } | |
54 | ||
55 | static inline bool kasan_sync_fault_possible(void) | |
8f7b5054 | 56 | { |
2d27e585 | 57 | return kasan_mode == KASAN_MODE_SYNC || kasan_mode == KASAN_MODE_ASYMM; |
8f7b5054 | 58 | } |
fc0e5b91 | 59 | |
284f8590 | 60 | #else /* CONFIG_KASAN_HW_TAGS */ |
8f7b5054 | 61 | |
2d27e585 | 62 | static inline bool kasan_async_fault_possible(void) |
8f7b5054 VF |
63 | { |
64 | return false; | |
65 | } | |
66 | ||
2d27e585 VF |
67 | static inline bool kasan_sync_fault_possible(void) |
68 | { | |
69 | return true; | |
70 | } | |
71 | ||
284f8590 AK |
72 | #endif /* CONFIG_KASAN_HW_TAGS */ |
73 | ||
74 | #ifdef CONFIG_KASAN_GENERIC | |
75 | ||
76 | /* Generic KASAN uses per-object metadata to store stack traces. */ | |
77 | static inline bool kasan_requires_meta(void) | |
78 | { | |
79 | /* | |
80 | * Technically, Generic KASAN always collects stack traces right now. | |
81 | * However, let's use kasan_stack_collection_enabled() in case the | |
82 | * kasan.stacktrace command-line argument is changed to affect | |
83 | * Generic KASAN. | |
84 | */ | |
85 | return kasan_stack_collection_enabled(); | |
86 | } | |
87 | ||
88 | #else /* CONFIG_KASAN_GENERIC */ | |
89 | ||
90 | /* Tag-based KASAN modes do not use per-object metadata. */ | |
91 | static inline bool kasan_requires_meta(void) | |
92 | { | |
93 | return false; | |
94 | } | |
95 | ||
96 | #endif /* CONFIG_KASAN_GENERIC */ | |
8028caac | 97 | |
6c6a04fe | 98 | #if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS) |
1f600626 | 99 | #define KASAN_GRANULE_SIZE (1UL << KASAN_SHADOW_SCALE_SHIFT) |
6c6a04fe AK |
100 | #else |
101 | #include <asm/mte-kasan.h> | |
102 | #define KASAN_GRANULE_SIZE MTE_GRANULE_SIZE | |
103 | #endif | |
104 | ||
1f600626 | 105 | #define KASAN_GRANULE_MASK (KASAN_GRANULE_SIZE - 1) |
0b24becc | 106 | |
affc3f07 AK |
107 | #define KASAN_MEMORY_PER_SHADOW_PAGE (KASAN_GRANULE_SIZE << PAGE_SHIFT) |
108 | ||
7f94ffbc | 109 | #ifdef CONFIG_KASAN_GENERIC |
06bc4cf6 | 110 | #define KASAN_PAGE_FREE 0xFF /* freed page */ |
83f8e4a8 | 111 | #define KASAN_PAGE_REDZONE 0xFE /* redzone for kmalloc_large allocation */ |
06bc4cf6 AK |
112 | #define KASAN_SLAB_REDZONE 0xFC /* redzone for slab object */ |
113 | #define KASAN_SLAB_FREE 0xFB /* freed slab object */ | |
83f8e4a8 | 114 | #define KASAN_VMALLOC_INVALID 0xF8 /* inaccessible space in vmap area */ |
7f94ffbc | 115 | #else |
06bc4cf6 | 116 | #define KASAN_PAGE_FREE KASAN_TAG_INVALID |
83f8e4a8 | 117 | #define KASAN_PAGE_REDZONE KASAN_TAG_INVALID |
06bc4cf6 AK |
118 | #define KASAN_SLAB_REDZONE KASAN_TAG_INVALID |
119 | #define KASAN_SLAB_FREE KASAN_TAG_INVALID | |
83f8e4a8 | 120 | #define KASAN_VMALLOC_INVALID KASAN_TAG_INVALID /* only used for SW_TAGS */ |
7f94ffbc AK |
121 | #endif |
122 | ||
fe1ac91e AK |
123 | #ifdef CONFIG_KASAN_GENERIC |
124 | ||
06bc4cf6 | 125 | #define KASAN_SLAB_FREETRACK 0xFA /* freed slab object with free track */ |
83f8e4a8 | 126 | #define KASAN_GLOBAL_REDZONE 0xF9 /* redzone for global variable */ |
0316bec2 | 127 | |
fc0e5b91 | 128 | /* Stack redzone shadow values. Compiler ABI, do not change. */ |
83f8e4a8 AK |
129 | #define KASAN_STACK_LEFT 0xF1 |
130 | #define KASAN_STACK_MID 0xF2 | |
131 | #define KASAN_STACK_RIGHT 0xF3 | |
132 | #define KASAN_STACK_PARTIAL 0xF4 | |
c420f167 | 133 | |
fc0e5b91 | 134 | /* alloca redzone shadow values. */ |
342061ee PL |
135 | #define KASAN_ALLOCA_LEFT 0xCA |
136 | #define KASAN_ALLOCA_RIGHT 0xCB | |
137 | ||
fc0e5b91 | 138 | /* alloca redzone size. Compiler ABI, do not change. */ |
342061ee PL |
139 | #define KASAN_ALLOCA_REDZONE_SIZE 32 |
140 | ||
fc0e5b91 | 141 | /* Stack frame marker. Compiler ABI, do not change. */ |
e8969219 ME |
142 | #define KASAN_CURRENT_STACK_FRAME_MAGIC 0x41B58AB3 |
143 | ||
fc0e5b91 | 144 | /* Dummy value to avoid breaking randconfig/all*config builds. */ |
bebf56a1 AR |
145 | #ifndef KASAN_ABI_VERSION |
146 | #define KASAN_ABI_VERSION 1 | |
147 | #endif | |
b8c73fc2 | 148 | |
fe1ac91e AK |
149 | #endif /* CONFIG_KASAN_GENERIC */ |
150 | ||
96e0279d AK |
151 | /* Metadata layout customization. */ |
152 | #define META_BYTES_PER_BLOCK 1 | |
153 | #define META_BLOCKS_PER_ROW 16 | |
154 | #define META_BYTES_PER_ROW (META_BLOCKS_PER_ROW * META_BYTES_PER_BLOCK) | |
155 | #define META_MEM_BYTES_PER_ROW (META_BYTES_PER_ROW * KASAN_GRANULE_SIZE) | |
156 | #define META_ROWS_AROUND_ADDR 2 | |
157 | ||
59e6e098 AK |
158 | #define KASAN_STACK_DEPTH 64 |
159 | ||
160 | struct kasan_track { | |
161 | u32 pid; | |
162 | depot_stack_handle_t stack; | |
163 | }; | |
164 | ||
31c65110 AK |
165 | enum kasan_report_type { |
166 | KASAN_REPORT_ACCESS, | |
167 | KASAN_REPORT_INVALID_FREE, | |
3de0de75 | 168 | KASAN_REPORT_DOUBLE_FREE, |
31c65110 AK |
169 | }; |
170 | ||
c965cdd6 | 171 | struct kasan_report_info { |
015b109f | 172 | /* Filled in by kasan_report_*(). */ |
31c65110 | 173 | enum kasan_report_type type; |
9d7b7dd9 | 174 | void *access_addr; |
0b24becc AR |
175 | size_t access_size; |
176 | bool is_write; | |
177 | unsigned long ip; | |
015b109f AK |
178 | |
179 | /* Filled in by the common reporting code. */ | |
180 | void *first_bad_addr; | |
7fae3dd0 AK |
181 | struct kmem_cache *cache; |
182 | void *object; | |
59e6e098 AK |
183 | |
184 | /* Filled in by the mode-specific reporting code. */ | |
185 | const char *bug_type; | |
186 | struct kasan_track alloc_track; | |
187 | struct kasan_track free_track; | |
0b24becc AR |
188 | }; |
189 | ||
fc0e5b91 | 190 | /* Do not change the struct layout: compiler ABI. */ |
bebf56a1 AR |
191 | struct kasan_source_location { |
192 | const char *filename; | |
193 | int line_no; | |
194 | int column_no; | |
195 | }; | |
196 | ||
fc0e5b91 | 197 | /* Do not change the struct layout: compiler ABI. */ |
bebf56a1 AR |
198 | struct kasan_global { |
199 | const void *beg; /* Address of the beginning of the global variable. */ | |
200 | size_t size; /* Size of the global variable. */ | |
fc0e5b91 | 201 | size_t size_with_redzone; /* Size of the variable + size of the redzone. 32 bytes aligned. */ |
bebf56a1 AR |
202 | const void *name; |
203 | const void *module_name; /* Name of the module where the global variable is declared. */ | |
fc0e5b91 | 204 | unsigned long has_dynamic_init; /* This is needed for C++. */ |
bebf56a1 AR |
205 | #if KASAN_ABI_VERSION >= 4 |
206 | struct kasan_source_location *location; | |
207 | #endif | |
045d599a DV |
208 | #if KASAN_ABI_VERSION >= 5 |
209 | char *odr_indicator; | |
210 | #endif | |
bebf56a1 AR |
211 | }; |
212 | ||
59e6e098 | 213 | /* Structures for keeping alloc and free meta. */ |
7ed2f9e6 | 214 | |
be95e13f AK |
215 | #ifdef CONFIG_KASAN_GENERIC |
216 | ||
7ed2f9e6 | 217 | struct kasan_alloc_meta { |
b3cbd9bf | 218 | struct kasan_track alloc_track; |
be95e13f | 219 | /* Free track is stored in kasan_free_meta. */ |
26e760c9 | 220 | depot_stack_handle_t aux_stack[2]; |
7ed2f9e6 AP |
221 | }; |
222 | ||
55834c59 AP |
223 | struct qlist_node { |
224 | struct qlist_node *next; | |
225 | }; | |
97593cad AK |
226 | |
227 | /* | |
fc0e5b91 AK |
228 | * Free meta is stored either in the object itself or in the redzone after the |
229 | * object. In the former case, free meta offset is 0. In the latter case, the | |
230 | * offset is between 0 and INT_MAX. INT_MAX marks that free meta is not present. | |
97593cad AK |
231 | */ |
232 | #define KASAN_NO_FREE_META INT_MAX | |
233 | ||
fc0e5b91 AK |
234 | /* |
235 | * Free meta is only used by Generic mode while the object is in quarantine. | |
236 | * After that, slab allocator stores the freelist pointer in the object. | |
237 | */ | |
7ed2f9e6 | 238 | struct kasan_free_meta { |
55834c59 | 239 | struct qlist_node quarantine_link; |
e4b7818b | 240 | struct kasan_track free_track; |
7ed2f9e6 AP |
241 | }; |
242 | ||
be95e13f AK |
243 | #endif /* CONFIG_KASAN_GENERIC */ |
244 | ||
7bc0584e AK |
245 | #if defined(CONFIG_KASAN_SW_TAGS) || defined(CONFIG_KASAN_HW_TAGS) |
246 | ||
247 | struct kasan_stack_ring_entry { | |
248 | void *ptr; | |
249 | size_t size; | |
250 | u32 pid; | |
251 | depot_stack_handle_t stack; | |
252 | bool is_free; | |
253 | }; | |
254 | ||
7bc0584e AK |
255 | struct kasan_stack_ring { |
256 | rwlock_t lock; | |
80b92bfe | 257 | size_t size; |
7bc0584e | 258 | atomic64_t pos; |
80b92bfe | 259 | struct kasan_stack_ring_entry *entries; |
7bc0584e AK |
260 | }; |
261 | ||
262 | #endif /* CONFIG_KASAN_SW_TAGS || CONFIG_KASAN_HW_TAGS */ | |
263 | ||
2e903b91 AK |
264 | #if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS) |
265 | ||
0b24becc AR |
266 | static inline const void *kasan_shadow_to_mem(const void *shadow_addr) |
267 | { | |
268 | return (void *)(((unsigned long)shadow_addr - KASAN_SHADOW_OFFSET) | |
269 | << KASAN_SHADOW_SCALE_SHIFT); | |
270 | } | |
271 | ||
6882464f | 272 | static inline bool addr_has_metadata(const void *addr) |
11cd3cd6 | 273 | { |
9d7b7dd9 AK |
274 | return (kasan_reset_tag(addr) >= |
275 | kasan_shadow_to_mem((void *)KASAN_SHADOW_START)); | |
11cd3cd6 AK |
276 | } |
277 | ||
b5f6e0fc | 278 | /** |
f00748bf | 279 | * kasan_check_range - Check memory region, and report if invalid access. |
b5f6e0fc ME |
280 | * @addr: the accessed address |
281 | * @size: the accessed size | |
282 | * @write: true if access is a write access | |
283 | * @ret_ip: return address | |
284 | * @return: true if access was valid, false if invalid | |
285 | */ | |
f00748bf | 286 | bool kasan_check_range(unsigned long addr, size_t size, bool write, |
bffa986c AK |
287 | unsigned long ret_ip); |
288 | ||
2e903b91 AK |
289 | #else /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */ |
290 | ||
291 | static inline bool addr_has_metadata(const void *addr) | |
292 | { | |
b99acdcb | 293 | return (is_vmalloc_addr(addr) || virt_addr_valid(addr)); |
2e903b91 AK |
294 | } |
295 | ||
296 | #endif /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */ | |
297 | ||
59e6e098 AK |
298 | void *kasan_find_first_bad_addr(void *addr, size_t size); |
299 | void kasan_complete_mode_report_info(struct kasan_report_info *info); | |
300 | void kasan_metadata_fetch_row(char *buffer, void *row); | |
301 | ||
d8dd3971 | 302 | #if defined(CONFIG_KASAN_SW_TAGS) || defined(CONFIG_KASAN_HW_TAGS) |
f00748bf | 303 | void kasan_print_tags(u8 addr_tag, const void *addr); |
d8dd3971 | 304 | #else |
f00748bf | 305 | static inline void kasan_print_tags(u8 addr_tag, const void *addr) { } |
d8dd3971 AK |
306 | #endif |
307 | ||
1e0f611f | 308 | #if defined(CONFIG_KASAN_STACK) |
f00748bf | 309 | void kasan_print_address_stack_frame(const void *addr); |
97fc7122 | 310 | #else |
f00748bf | 311 | static inline void kasan_print_address_stack_frame(const void *addr) { } |
97fc7122 AK |
312 | #endif |
313 | ||
88f29765 AK |
314 | #ifdef CONFIG_KASAN_GENERIC |
315 | void kasan_print_aux_stacks(struct kmem_cache *cache, const void *object); | |
316 | #else | |
317 | static inline void kasan_print_aux_stacks(struct kmem_cache *cache, const void *object) { } | |
318 | #endif | |
319 | ||
8cceeff4 | 320 | bool kasan_report(unsigned long addr, size_t size, |
0b24becc | 321 | bool is_write, unsigned long ip); |
3de0de75 | 322 | void kasan_report_invalid_free(void *object, unsigned long ip, enum kasan_report_type type); |
0b24becc | 323 | |
6e48a966 | 324 | struct slab *kasan_addr_to_slab(const void *addr); |
ae8f06b3 | 325 | |
2f356801 | 326 | #ifdef CONFIG_KASAN_GENERIC |
5935143d | 327 | void kasan_init_cache_meta(struct kmem_cache *cache, unsigned int *size); |
284f8590 | 328 | void kasan_init_object_meta(struct kmem_cache *cache, const void *object); |
2f356801 AK |
329 | struct kasan_alloc_meta *kasan_get_alloc_meta(struct kmem_cache *cache, |
330 | const void *object); | |
331 | struct kasan_free_meta *kasan_get_free_meta(struct kmem_cache *cache, | |
332 | const void *object); | |
284f8590 | 333 | #else |
5935143d | 334 | static inline void kasan_init_cache_meta(struct kmem_cache *cache, unsigned int *size) { } |
284f8590 | 335 | static inline void kasan_init_object_meta(struct kmem_cache *cache, const void *object) { } |
2f356801 AK |
336 | #endif |
337 | ||
7594b347 | 338 | depot_stack_handle_t kasan_save_stack(gfp_t flags, bool can_alloc); |
e4b7818b | 339 | void kasan_set_track(struct kasan_track *track, gfp_t flags); |
ccf643e6 | 340 | void kasan_save_alloc_info(struct kmem_cache *cache, void *object, gfp_t flags); |
6b074349 | 341 | void kasan_save_free_info(struct kmem_cache *cache, void *object); |
26e760c9 | 342 | |
2bd926b4 AK |
343 | #if defined(CONFIG_KASAN_GENERIC) && \ |
344 | (defined(CONFIG_SLAB) || defined(CONFIG_SLUB)) | |
f00748bf AK |
345 | bool kasan_quarantine_put(struct kmem_cache *cache, void *object); |
346 | void kasan_quarantine_reduce(void); | |
347 | void kasan_quarantine_remove_cache(struct kmem_cache *cache); | |
55834c59 | 348 | #else |
f00748bf AK |
349 | static inline bool kasan_quarantine_put(struct kmem_cache *cache, void *object) { return false; } |
350 | static inline void kasan_quarantine_reduce(void) { } | |
351 | static inline void kasan_quarantine_remove_cache(struct kmem_cache *cache) { } | |
55834c59 AP |
352 | #endif |
353 | ||
3c9e3aa1 | 354 | #ifndef arch_kasan_set_tag |
c412a769 QC |
355 | static inline const void *arch_kasan_set_tag(const void *addr, u8 tag) |
356 | { | |
357 | return addr; | |
358 | } | |
3c9e3aa1 | 359 | #endif |
3c9e3aa1 AK |
360 | #ifndef arch_kasan_get_tag |
361 | #define arch_kasan_get_tag(addr) 0 | |
362 | #endif | |
363 | ||
364 | #define set_tag(addr, tag) ((void *)arch_kasan_set_tag((addr), (tag))) | |
3c9e3aa1 AK |
365 | #define get_tag(addr) arch_kasan_get_tag(addr) |
366 | ||
ccbe2aab AK |
367 | #ifdef CONFIG_KASAN_HW_TAGS |
368 | ||
2603f8a7 VF |
369 | #ifndef arch_enable_tagging_sync |
370 | #define arch_enable_tagging_sync() | |
371 | #endif | |
372 | #ifndef arch_enable_tagging_async | |
373 | #define arch_enable_tagging_async() | |
ccbe2aab | 374 | #endif |
2d27e585 VF |
375 | #ifndef arch_enable_tagging_asymm |
376 | #define arch_enable_tagging_asymm() | |
377 | #endif | |
e80a76aa AK |
378 | #ifndef arch_force_async_tag_fault |
379 | #define arch_force_async_tag_fault() | |
380 | #endif | |
ccbe2aab AK |
381 | #ifndef arch_get_random_tag |
382 | #define arch_get_random_tag() (0xFF) | |
383 | #endif | |
384 | #ifndef arch_get_mem_tag | |
385 | #define arch_get_mem_tag(addr) (0xFF) | |
386 | #endif | |
387 | #ifndef arch_set_mem_tag_range | |
d9b6f907 | 388 | #define arch_set_mem_tag_range(addr, size, tag, init) ((void *)(addr)) |
ccbe2aab AK |
389 | #endif |
390 | ||
2603f8a7 VF |
391 | #define hw_enable_tagging_sync() arch_enable_tagging_sync() |
392 | #define hw_enable_tagging_async() arch_enable_tagging_async() | |
2d27e585 | 393 | #define hw_enable_tagging_asymm() arch_enable_tagging_asymm() |
e80a76aa | 394 | #define hw_force_async_tag_fault() arch_force_async_tag_fault() |
ccbe2aab AK |
395 | #define hw_get_random_tag() arch_get_random_tag() |
396 | #define hw_get_mem_tag(addr) arch_get_mem_tag(addr) | |
d9b6f907 AK |
397 | #define hw_set_mem_tag_range(addr, size, tag, init) \ |
398 | arch_set_mem_tag_range((addr), (size), (tag), (init)) | |
ccbe2aab | 399 | |
b1add418 VF |
400 | void kasan_enable_tagging(void); |
401 | ||
f05842cf AK |
402 | #else /* CONFIG_KASAN_HW_TAGS */ |
403 | ||
2603f8a7 VF |
404 | #define hw_enable_tagging_sync() |
405 | #define hw_enable_tagging_async() | |
2d27e585 | 406 | #define hw_enable_tagging_asymm() |
f05842cf | 407 | |
b1add418 VF |
408 | static inline void kasan_enable_tagging(void) { } |
409 | ||
ccbe2aab AK |
410 | #endif /* CONFIG_KASAN_HW_TAGS */ |
411 | ||
7ebfce33 AK |
412 | #if defined(CONFIG_KASAN_SW_TAGS) || defined(CONFIG_KASAN_HW_TAGS) |
413 | void __init kasan_init_tags(void); | |
414 | #endif /* CONFIG_KASAN_SW_TAGS || CONFIG_KASAN_HW_TAGS */ | |
415 | ||
f05842cf AK |
416 | #if defined(CONFIG_KASAN_HW_TAGS) && IS_ENABLED(CONFIG_KASAN_KUNIT_TEST) |
417 | ||
e80a76aa | 418 | void kasan_force_async_fault(void); |
f05842cf | 419 | |
b1add418 | 420 | #else /* CONFIG_KASAN_HW_TAGS && CONFIG_KASAN_KUNIT_TEST */ |
f05842cf | 421 | |
e80a76aa | 422 | static inline void kasan_force_async_fault(void) { } |
f05842cf | 423 | |
b1add418 | 424 | #endif /* CONFIG_KASAN_HW_TAGS && CONFIG_KASAN_KUNIT_TEST */ |
f05842cf | 425 | |
d8dd3971 | 426 | #ifdef CONFIG_KASAN_SW_TAGS |
f00748bf | 427 | u8 kasan_random_tag(void); |
d8dd3971 | 428 | #elif defined(CONFIG_KASAN_HW_TAGS) |
f00748bf | 429 | static inline u8 kasan_random_tag(void) { return hw_get_random_tag(); } |
d8dd3971 | 430 | #else |
f00748bf | 431 | static inline u8 kasan_random_tag(void) { return 0; } |
d8dd3971 AK |
432 | #endif |
433 | ||
57345fa6 AK |
434 | #ifdef CONFIG_KASAN_HW_TAGS |
435 | ||
aa5c219c | 436 | static inline void kasan_poison(const void *addr, size_t size, u8 value, bool init) |
57345fa6 | 437 | { |
cde8a7eb | 438 | addr = kasan_reset_tag(addr); |
2b830526 AP |
439 | |
440 | /* Skip KFENCE memory if called explicitly outside of sl*b. */ | |
cde8a7eb | 441 | if (is_kfence_address(addr)) |
2b830526 AP |
442 | return; |
443 | ||
cde8a7eb AK |
444 | if (WARN_ON((unsigned long)addr & KASAN_GRANULE_MASK)) |
445 | return; | |
446 | if (WARN_ON(size & KASAN_GRANULE_MASK)) | |
447 | return; | |
448 | ||
aa5c219c | 449 | hw_set_mem_tag_range((void *)addr, size, value, init); |
57345fa6 AK |
450 | } |
451 | ||
aa5c219c | 452 | static inline void kasan_unpoison(const void *addr, size_t size, bool init) |
57345fa6 | 453 | { |
cde8a7eb | 454 | u8 tag = get_tag(addr); |
2b830526 | 455 | |
cde8a7eb | 456 | addr = kasan_reset_tag(addr); |
2b830526 AP |
457 | |
458 | /* Skip KFENCE memory if called explicitly outside of sl*b. */ | |
cde8a7eb AK |
459 | if (is_kfence_address(addr)) |
460 | return; | |
461 | ||
462 | if (WARN_ON((unsigned long)addr & KASAN_GRANULE_MASK)) | |
2b830526 | 463 | return; |
77a63c69 YL |
464 | /* |
465 | * Explicitly initialize the memory with the precise object size to | |
fc0e5b91 AK |
466 | * avoid overwriting the slab redzone. This disables initialization in |
467 | * the arch code and may thus lead to performance penalty. This penalty | |
468 | * does not affect production builds, as slab redzones are not enabled | |
469 | * there. | |
77a63c69 YL |
470 | */ |
471 | if (__slub_debug_enabled() && | |
472 | init && ((unsigned long)size & KASAN_GRANULE_MASK)) { | |
473 | init = false; | |
474 | memzero_explicit((void *)addr, size); | |
475 | } | |
cde8a7eb | 476 | size = round_up(size, KASAN_GRANULE_SIZE); |
2b830526 | 477 | |
aa5c219c | 478 | hw_set_mem_tag_range((void *)addr, size, tag, init); |
57345fa6 AK |
479 | } |
480 | ||
611806b4 | 481 | static inline bool kasan_byte_accessible(const void *addr) |
57345fa6 AK |
482 | { |
483 | u8 ptr_tag = get_tag(addr); | |
611806b4 | 484 | u8 mem_tag = hw_get_mem_tag((void *)addr); |
57345fa6 | 485 | |
bfcfe371 | 486 | return ptr_tag == KASAN_TAG_KERNEL || ptr_tag == mem_tag; |
57345fa6 AK |
487 | } |
488 | ||
489 | #else /* CONFIG_KASAN_HW_TAGS */ | |
490 | ||
e2db1a9a | 491 | /** |
f0953a1b | 492 | * kasan_poison - mark the memory range as inaccessible |
e2db1a9a | 493 | * @addr - range start address, must be aligned to KASAN_GRANULE_SIZE |
cde8a7eb | 494 | * @size - range size, must be aligned to KASAN_GRANULE_SIZE |
e2db1a9a | 495 | * @value - value that's written to metadata for the range |
aa5c219c | 496 | * @init - whether to initialize the memory range (only for hardware tag-based) |
e2db1a9a AK |
497 | * |
498 | * The size gets aligned to KASAN_GRANULE_SIZE before marking the range. | |
499 | */ | |
aa5c219c | 500 | void kasan_poison(const void *addr, size_t size, u8 value, bool init); |
e2db1a9a AK |
501 | |
502 | /** | |
503 | * kasan_unpoison - mark the memory range as accessible | |
504 | * @addr - range start address, must be aligned to KASAN_GRANULE_SIZE | |
cde8a7eb | 505 | * @size - range size, can be unaligned |
aa5c219c | 506 | * @init - whether to initialize the memory range (only for hardware tag-based) |
e2db1a9a AK |
507 | * |
508 | * For the tag-based modes, the @size gets aligned to KASAN_GRANULE_SIZE before | |
509 | * marking the range. | |
510 | * For the generic mode, the last granule of the memory range gets partially | |
511 | * unpoisoned based on the @size. | |
512 | */ | |
aa5c219c | 513 | void kasan_unpoison(const void *addr, size_t size, bool init); |
e2db1a9a | 514 | |
611806b4 | 515 | bool kasan_byte_accessible(const void *addr); |
57345fa6 AK |
516 | |
517 | #endif /* CONFIG_KASAN_HW_TAGS */ | |
518 | ||
e2db1a9a AK |
519 | #ifdef CONFIG_KASAN_GENERIC |
520 | ||
521 | /** | |
522 | * kasan_poison_last_granule - mark the last granule of the memory range as | |
f0953a1b | 523 | * inaccessible |
e2db1a9a AK |
524 | * @addr - range start address, must be aligned to KASAN_GRANULE_SIZE |
525 | * @size - range size | |
526 | * | |
527 | * This function is only available for the generic mode, as it's the only mode | |
528 | * that has partially poisoned memory granules. | |
529 | */ | |
530 | void kasan_poison_last_granule(const void *address, size_t size); | |
531 | ||
532 | #else /* CONFIG_KASAN_GENERIC */ | |
533 | ||
534 | static inline void kasan_poison_last_granule(const void *address, size_t size) { } | |
535 | ||
536 | #endif /* CONFIG_KASAN_GENERIC */ | |
537 | ||
af3751f3 DA |
538 | #ifndef kasan_arch_is_ready |
539 | static inline bool kasan_arch_is_ready(void) { return true; } | |
540 | #elif !defined(CONFIG_KASAN_GENERIC) || !defined(CONFIG_KASAN_OUTLINE) | |
541 | #error kasan_arch_is_ready only works in KASAN generic outline mode! | |
542 | #endif | |
543 | ||
c8c7016f AK |
544 | #if IS_ENABLED(CONFIG_KASAN_KUNIT_TEST) |
545 | ||
546 | void kasan_kunit_test_suite_start(void); | |
547 | void kasan_kunit_test_suite_end(void); | |
548 | ||
549 | #else /* CONFIG_KASAN_KUNIT_TEST */ | |
550 | ||
551 | static inline void kasan_kunit_test_suite_start(void) { } | |
552 | static inline void kasan_kunit_test_suite_end(void) { } | |
553 | ||
554 | #endif /* CONFIG_KASAN_KUNIT_TEST */ | |
555 | ||
80207910 AK |
556 | #if IS_ENABLED(CONFIG_KASAN_KUNIT_TEST) || IS_ENABLED(CONFIG_KASAN_MODULE_TEST) |
557 | ||
558 | bool kasan_save_enable_multi_shot(void); | |
559 | void kasan_restore_multi_shot(bool enabled); | |
560 | ||
561 | #endif | |
562 | ||
d321599c AP |
563 | /* |
564 | * Exported functions for interfaces called from assembly or from generated | |
fc0e5b91 | 565 | * code. Declared here to avoid warnings about missing declarations. |
d321599c | 566 | */ |
fc0e5b91 | 567 | |
d321599c AP |
568 | asmlinkage void kasan_unpoison_task_stack_below(const void *watermark); |
569 | void __asan_register_globals(struct kasan_global *globals, size_t size); | |
570 | void __asan_unregister_globals(struct kasan_global *globals, size_t size); | |
d321599c | 571 | void __asan_handle_no_return(void); |
d321599c AP |
572 | void __asan_alloca_poison(unsigned long addr, size_t size); |
573 | void __asan_allocas_unpoison(const void *stack_top, const void *stack_bottom); | |
574 | ||
575 | void __asan_load1(unsigned long addr); | |
576 | void __asan_store1(unsigned long addr); | |
577 | void __asan_load2(unsigned long addr); | |
578 | void __asan_store2(unsigned long addr); | |
579 | void __asan_load4(unsigned long addr); | |
580 | void __asan_store4(unsigned long addr); | |
581 | void __asan_load8(unsigned long addr); | |
582 | void __asan_store8(unsigned long addr); | |
583 | void __asan_load16(unsigned long addr); | |
584 | void __asan_store16(unsigned long addr); | |
13cf0488 AK |
585 | void __asan_loadN(unsigned long addr, size_t size); |
586 | void __asan_storeN(unsigned long addr, size_t size); | |
d321599c AP |
587 | |
588 | void __asan_load1_noabort(unsigned long addr); | |
589 | void __asan_store1_noabort(unsigned long addr); | |
590 | void __asan_load2_noabort(unsigned long addr); | |
591 | void __asan_store2_noabort(unsigned long addr); | |
592 | void __asan_load4_noabort(unsigned long addr); | |
593 | void __asan_store4_noabort(unsigned long addr); | |
594 | void __asan_load8_noabort(unsigned long addr); | |
595 | void __asan_store8_noabort(unsigned long addr); | |
596 | void __asan_load16_noabort(unsigned long addr); | |
597 | void __asan_store16_noabort(unsigned long addr); | |
13cf0488 AK |
598 | void __asan_loadN_noabort(unsigned long addr, size_t size); |
599 | void __asan_storeN_noabort(unsigned long addr, size_t size); | |
600 | ||
601 | void __asan_report_load1_noabort(unsigned long addr); | |
602 | void __asan_report_store1_noabort(unsigned long addr); | |
603 | void __asan_report_load2_noabort(unsigned long addr); | |
604 | void __asan_report_store2_noabort(unsigned long addr); | |
605 | void __asan_report_load4_noabort(unsigned long addr); | |
606 | void __asan_report_store4_noabort(unsigned long addr); | |
607 | void __asan_report_load8_noabort(unsigned long addr); | |
608 | void __asan_report_store8_noabort(unsigned long addr); | |
609 | void __asan_report_load16_noabort(unsigned long addr); | |
610 | void __asan_report_store16_noabort(unsigned long addr); | |
611 | void __asan_report_load_n_noabort(unsigned long addr, size_t size); | |
612 | void __asan_report_store_n_noabort(unsigned long addr, size_t size); | |
d321599c AP |
613 | |
614 | void __asan_set_shadow_00(const void *addr, size_t size); | |
615 | void __asan_set_shadow_f1(const void *addr, size_t size); | |
616 | void __asan_set_shadow_f2(const void *addr, size_t size); | |
617 | void __asan_set_shadow_f3(const void *addr, size_t size); | |
618 | void __asan_set_shadow_f5(const void *addr, size_t size); | |
619 | void __asan_set_shadow_f8(const void *addr, size_t size); | |
620 | ||
13cf0488 AK |
621 | void __hwasan_load1_noabort(unsigned long addr); |
622 | void __hwasan_store1_noabort(unsigned long addr); | |
623 | void __hwasan_load2_noabort(unsigned long addr); | |
624 | void __hwasan_store2_noabort(unsigned long addr); | |
625 | void __hwasan_load4_noabort(unsigned long addr); | |
626 | void __hwasan_store4_noabort(unsigned long addr); | |
627 | void __hwasan_load8_noabort(unsigned long addr); | |
628 | void __hwasan_store8_noabort(unsigned long addr); | |
629 | void __hwasan_load16_noabort(unsigned long addr); | |
630 | void __hwasan_store16_noabort(unsigned long addr); | |
631 | void __hwasan_loadN_noabort(unsigned long addr, size_t size); | |
632 | void __hwasan_storeN_noabort(unsigned long addr, size_t size); | |
633 | ||
634 | void __hwasan_tag_memory(unsigned long addr, u8 tag, unsigned long size); | |
635 | ||
fc0e5b91 | 636 | #endif /* __MM_KASAN_KASAN_H */ |