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 | ||
5 | #include <linux/kasan.h> | |
82868247 | 6 | #include <linux/kasan-tags.h> |
2b830526 | 7 | #include <linux/kfence.h> |
cd11016e | 8 | #include <linux/stackdepot.h> |
0b24becc | 9 | |
8028caac | 10 | #ifdef CONFIG_KASAN_HW_TAGS |
8f7b5054 | 11 | |
8028caac | 12 | #include <linux/static_key.h> |
77a63c69 | 13 | #include "../slab.h" |
8f7b5054 | 14 | |
551b2bcb | 15 | DECLARE_STATIC_KEY_TRUE(kasan_flag_vmalloc); |
241944d1 | 16 | DECLARE_STATIC_KEY_TRUE(kasan_flag_stacktrace); |
2d27e585 VF |
17 | |
18 | enum kasan_mode { | |
19 | KASAN_MODE_SYNC, | |
20 | KASAN_MODE_ASYNC, | |
21 | KASAN_MODE_ASYMM, | |
22 | }; | |
23 | ||
24 | extern enum kasan_mode kasan_mode __ro_after_init; | |
8f7b5054 | 25 | |
551b2bcb AK |
26 | static inline bool kasan_vmalloc_enabled(void) |
27 | { | |
28 | return static_branch_likely(&kasan_flag_vmalloc); | |
29 | } | |
30 | ||
8028caac AK |
31 | static inline bool kasan_stack_collection_enabled(void) |
32 | { | |
33 | return static_branch_unlikely(&kasan_flag_stacktrace); | |
34 | } | |
8f7b5054 | 35 | |
2d27e585 VF |
36 | static inline bool kasan_async_fault_possible(void) |
37 | { | |
38 | return kasan_mode == KASAN_MODE_ASYNC || kasan_mode == KASAN_MODE_ASYMM; | |
39 | } | |
40 | ||
41 | static inline bool kasan_sync_fault_possible(void) | |
8f7b5054 | 42 | { |
2d27e585 | 43 | return kasan_mode == KASAN_MODE_SYNC || kasan_mode == KASAN_MODE_ASYMM; |
8f7b5054 | 44 | } |
fc0e5b91 | 45 | |
284f8590 | 46 | #else /* CONFIG_KASAN_HW_TAGS */ |
8f7b5054 | 47 | |
8028caac AK |
48 | static inline bool kasan_stack_collection_enabled(void) |
49 | { | |
50 | return true; | |
51 | } | |
8f7b5054 | 52 | |
2d27e585 | 53 | static inline bool kasan_async_fault_possible(void) |
8f7b5054 VF |
54 | { |
55 | return false; | |
56 | } | |
57 | ||
2d27e585 VF |
58 | static inline bool kasan_sync_fault_possible(void) |
59 | { | |
60 | return true; | |
61 | } | |
62 | ||
284f8590 AK |
63 | #endif /* CONFIG_KASAN_HW_TAGS */ |
64 | ||
65 | #ifdef CONFIG_KASAN_GENERIC | |
66 | ||
67 | /* Generic KASAN uses per-object metadata to store stack traces. */ | |
68 | static inline bool kasan_requires_meta(void) | |
69 | { | |
70 | /* | |
71 | * Technically, Generic KASAN always collects stack traces right now. | |
72 | * However, let's use kasan_stack_collection_enabled() in case the | |
73 | * kasan.stacktrace command-line argument is changed to affect | |
74 | * Generic KASAN. | |
75 | */ | |
76 | return kasan_stack_collection_enabled(); | |
77 | } | |
78 | ||
79 | #else /* CONFIG_KASAN_GENERIC */ | |
80 | ||
81 | /* Tag-based KASAN modes do not use per-object metadata. */ | |
82 | static inline bool kasan_requires_meta(void) | |
83 | { | |
84 | return false; | |
85 | } | |
86 | ||
87 | #endif /* CONFIG_KASAN_GENERIC */ | |
8028caac | 88 | |
6c6a04fe | 89 | #if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS) |
1f600626 | 90 | #define KASAN_GRANULE_SIZE (1UL << KASAN_SHADOW_SCALE_SHIFT) |
6c6a04fe AK |
91 | #else |
92 | #include <asm/mte-kasan.h> | |
93 | #define KASAN_GRANULE_SIZE MTE_GRANULE_SIZE | |
94 | #endif | |
95 | ||
1f600626 | 96 | #define KASAN_GRANULE_MASK (KASAN_GRANULE_SIZE - 1) |
0b24becc | 97 | |
affc3f07 AK |
98 | #define KASAN_MEMORY_PER_SHADOW_PAGE (KASAN_GRANULE_SIZE << PAGE_SHIFT) |
99 | ||
7f94ffbc | 100 | #ifdef CONFIG_KASAN_GENERIC |
06bc4cf6 | 101 | #define KASAN_PAGE_FREE 0xFF /* freed page */ |
83f8e4a8 | 102 | #define KASAN_PAGE_REDZONE 0xFE /* redzone for kmalloc_large allocation */ |
06bc4cf6 AK |
103 | #define KASAN_SLAB_REDZONE 0xFC /* redzone for slab object */ |
104 | #define KASAN_SLAB_FREE 0xFB /* freed slab object */ | |
83f8e4a8 | 105 | #define KASAN_VMALLOC_INVALID 0xF8 /* inaccessible space in vmap area */ |
7f94ffbc | 106 | #else |
06bc4cf6 | 107 | #define KASAN_PAGE_FREE KASAN_TAG_INVALID |
83f8e4a8 | 108 | #define KASAN_PAGE_REDZONE KASAN_TAG_INVALID |
06bc4cf6 AK |
109 | #define KASAN_SLAB_REDZONE KASAN_TAG_INVALID |
110 | #define KASAN_SLAB_FREE KASAN_TAG_INVALID | |
83f8e4a8 | 111 | #define KASAN_VMALLOC_INVALID KASAN_TAG_INVALID /* only used for SW_TAGS */ |
7f94ffbc AK |
112 | #endif |
113 | ||
fe1ac91e AK |
114 | #ifdef CONFIG_KASAN_GENERIC |
115 | ||
06bc4cf6 | 116 | #define KASAN_SLAB_FREETRACK 0xFA /* freed slab object with free track */ |
83f8e4a8 | 117 | #define KASAN_GLOBAL_REDZONE 0xF9 /* redzone for global variable */ |
0316bec2 | 118 | |
fc0e5b91 | 119 | /* Stack redzone shadow values. Compiler ABI, do not change. */ |
83f8e4a8 AK |
120 | #define KASAN_STACK_LEFT 0xF1 |
121 | #define KASAN_STACK_MID 0xF2 | |
122 | #define KASAN_STACK_RIGHT 0xF3 | |
123 | #define KASAN_STACK_PARTIAL 0xF4 | |
c420f167 | 124 | |
fc0e5b91 | 125 | /* alloca redzone shadow values. */ |
342061ee PL |
126 | #define KASAN_ALLOCA_LEFT 0xCA |
127 | #define KASAN_ALLOCA_RIGHT 0xCB | |
128 | ||
fc0e5b91 | 129 | /* alloca redzone size. Compiler ABI, do not change. */ |
342061ee PL |
130 | #define KASAN_ALLOCA_REDZONE_SIZE 32 |
131 | ||
fc0e5b91 | 132 | /* Stack frame marker. Compiler ABI, do not change. */ |
e8969219 ME |
133 | #define KASAN_CURRENT_STACK_FRAME_MAGIC 0x41B58AB3 |
134 | ||
fc0e5b91 | 135 | /* Dummy value to avoid breaking randconfig/all*config builds. */ |
bebf56a1 AR |
136 | #ifndef KASAN_ABI_VERSION |
137 | #define KASAN_ABI_VERSION 1 | |
138 | #endif | |
b8c73fc2 | 139 | |
fe1ac91e AK |
140 | #endif /* CONFIG_KASAN_GENERIC */ |
141 | ||
96e0279d AK |
142 | /* Metadata layout customization. */ |
143 | #define META_BYTES_PER_BLOCK 1 | |
144 | #define META_BLOCKS_PER_ROW 16 | |
145 | #define META_BYTES_PER_ROW (META_BLOCKS_PER_ROW * META_BYTES_PER_BLOCK) | |
146 | #define META_MEM_BYTES_PER_ROW (META_BYTES_PER_ROW * KASAN_GRANULE_SIZE) | |
147 | #define META_ROWS_AROUND_ADDR 2 | |
148 | ||
59e6e098 AK |
149 | #define KASAN_STACK_DEPTH 64 |
150 | ||
151 | struct kasan_track { | |
152 | u32 pid; | |
153 | depot_stack_handle_t stack; | |
154 | }; | |
155 | ||
31c65110 AK |
156 | enum kasan_report_type { |
157 | KASAN_REPORT_ACCESS, | |
158 | KASAN_REPORT_INVALID_FREE, | |
3de0de75 | 159 | KASAN_REPORT_DOUBLE_FREE, |
31c65110 AK |
160 | }; |
161 | ||
c965cdd6 | 162 | struct kasan_report_info { |
015b109f | 163 | /* Filled in by kasan_report_*(). */ |
31c65110 | 164 | enum kasan_report_type type; |
9d7b7dd9 | 165 | void *access_addr; |
0b24becc AR |
166 | size_t access_size; |
167 | bool is_write; | |
168 | unsigned long ip; | |
015b109f AK |
169 | |
170 | /* Filled in by the common reporting code. */ | |
171 | void *first_bad_addr; | |
7fae3dd0 AK |
172 | struct kmem_cache *cache; |
173 | void *object; | |
59e6e098 AK |
174 | |
175 | /* Filled in by the mode-specific reporting code. */ | |
176 | const char *bug_type; | |
177 | struct kasan_track alloc_track; | |
178 | struct kasan_track free_track; | |
0b24becc AR |
179 | }; |
180 | ||
fc0e5b91 | 181 | /* Do not change the struct layout: compiler ABI. */ |
bebf56a1 AR |
182 | struct kasan_source_location { |
183 | const char *filename; | |
184 | int line_no; | |
185 | int column_no; | |
186 | }; | |
187 | ||
fc0e5b91 | 188 | /* Do not change the struct layout: compiler ABI. */ |
bebf56a1 AR |
189 | struct kasan_global { |
190 | const void *beg; /* Address of the beginning of the global variable. */ | |
191 | size_t size; /* Size of the global variable. */ | |
fc0e5b91 | 192 | size_t size_with_redzone; /* Size of the variable + size of the redzone. 32 bytes aligned. */ |
bebf56a1 AR |
193 | const void *name; |
194 | const void *module_name; /* Name of the module where the global variable is declared. */ | |
fc0e5b91 | 195 | unsigned long has_dynamic_init; /* This is needed for C++. */ |
bebf56a1 AR |
196 | #if KASAN_ABI_VERSION >= 4 |
197 | struct kasan_source_location *location; | |
198 | #endif | |
045d599a DV |
199 | #if KASAN_ABI_VERSION >= 5 |
200 | char *odr_indicator; | |
201 | #endif | |
bebf56a1 AR |
202 | }; |
203 | ||
59e6e098 | 204 | /* Structures for keeping alloc and free meta. */ |
7ed2f9e6 | 205 | |
be95e13f AK |
206 | #ifdef CONFIG_KASAN_GENERIC |
207 | ||
7ed2f9e6 | 208 | struct kasan_alloc_meta { |
b3cbd9bf | 209 | struct kasan_track alloc_track; |
be95e13f | 210 | /* Free track is stored in kasan_free_meta. */ |
26e760c9 | 211 | depot_stack_handle_t aux_stack[2]; |
7ed2f9e6 AP |
212 | }; |
213 | ||
55834c59 AP |
214 | struct qlist_node { |
215 | struct qlist_node *next; | |
216 | }; | |
97593cad AK |
217 | |
218 | /* | |
fc0e5b91 AK |
219 | * Free meta is stored either in the object itself or in the redzone after the |
220 | * object. In the former case, free meta offset is 0. In the latter case, the | |
221 | * offset is between 0 and INT_MAX. INT_MAX marks that free meta is not present. | |
97593cad AK |
222 | */ |
223 | #define KASAN_NO_FREE_META INT_MAX | |
224 | ||
fc0e5b91 AK |
225 | /* |
226 | * Free meta is only used by Generic mode while the object is in quarantine. | |
227 | * After that, slab allocator stores the freelist pointer in the object. | |
228 | */ | |
7ed2f9e6 | 229 | struct kasan_free_meta { |
55834c59 | 230 | struct qlist_node quarantine_link; |
e4b7818b | 231 | struct kasan_track free_track; |
7ed2f9e6 AP |
232 | }; |
233 | ||
be95e13f AK |
234 | #endif /* CONFIG_KASAN_GENERIC */ |
235 | ||
49d9977a AK |
236 | #if IS_ENABLED(CONFIG_KASAN_KUNIT_TEST) |
237 | /* Used in KUnit-compatible KASAN tests. */ | |
238 | struct kunit_kasan_status { | |
239 | bool report_found; | |
240 | bool sync_fault; | |
241 | }; | |
242 | #endif | |
243 | ||
2e903b91 AK |
244 | #if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS) |
245 | ||
0b24becc AR |
246 | static inline const void *kasan_shadow_to_mem(const void *shadow_addr) |
247 | { | |
248 | return (void *)(((unsigned long)shadow_addr - KASAN_SHADOW_OFFSET) | |
249 | << KASAN_SHADOW_SCALE_SHIFT); | |
250 | } | |
251 | ||
6882464f | 252 | static inline bool addr_has_metadata(const void *addr) |
11cd3cd6 | 253 | { |
9d7b7dd9 AK |
254 | return (kasan_reset_tag(addr) >= |
255 | kasan_shadow_to_mem((void *)KASAN_SHADOW_START)); | |
11cd3cd6 AK |
256 | } |
257 | ||
b5f6e0fc | 258 | /** |
f00748bf | 259 | * kasan_check_range - Check memory region, and report if invalid access. |
b5f6e0fc ME |
260 | * @addr: the accessed address |
261 | * @size: the accessed size | |
262 | * @write: true if access is a write access | |
263 | * @ret_ip: return address | |
264 | * @return: true if access was valid, false if invalid | |
265 | */ | |
f00748bf | 266 | bool kasan_check_range(unsigned long addr, size_t size, bool write, |
bffa986c AK |
267 | unsigned long ret_ip); |
268 | ||
2e903b91 AK |
269 | #else /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */ |
270 | ||
271 | static inline bool addr_has_metadata(const void *addr) | |
272 | { | |
b99acdcb | 273 | return (is_vmalloc_addr(addr) || virt_addr_valid(addr)); |
2e903b91 AK |
274 | } |
275 | ||
276 | #endif /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */ | |
277 | ||
59e6e098 AK |
278 | void *kasan_find_first_bad_addr(void *addr, size_t size); |
279 | void kasan_complete_mode_report_info(struct kasan_report_info *info); | |
280 | void kasan_metadata_fetch_row(char *buffer, void *row); | |
281 | ||
d8dd3971 | 282 | #if defined(CONFIG_KASAN_SW_TAGS) || defined(CONFIG_KASAN_HW_TAGS) |
f00748bf | 283 | void kasan_print_tags(u8 addr_tag, const void *addr); |
d8dd3971 | 284 | #else |
f00748bf | 285 | static inline void kasan_print_tags(u8 addr_tag, const void *addr) { } |
d8dd3971 AK |
286 | #endif |
287 | ||
1e0f611f | 288 | #if defined(CONFIG_KASAN_STACK) |
f00748bf | 289 | void kasan_print_address_stack_frame(const void *addr); |
97fc7122 | 290 | #else |
f00748bf | 291 | static inline void kasan_print_address_stack_frame(const void *addr) { } |
97fc7122 AK |
292 | #endif |
293 | ||
88f29765 AK |
294 | #ifdef CONFIG_KASAN_GENERIC |
295 | void kasan_print_aux_stacks(struct kmem_cache *cache, const void *object); | |
296 | #else | |
297 | static inline void kasan_print_aux_stacks(struct kmem_cache *cache, const void *object) { } | |
298 | #endif | |
299 | ||
8cceeff4 | 300 | bool kasan_report(unsigned long addr, size_t size, |
0b24becc | 301 | bool is_write, unsigned long ip); |
3de0de75 | 302 | void kasan_report_invalid_free(void *object, unsigned long ip, enum kasan_report_type type); |
0b24becc | 303 | |
6e48a966 | 304 | struct slab *kasan_addr_to_slab(const void *addr); |
ae8f06b3 | 305 | |
2f356801 | 306 | #ifdef CONFIG_KASAN_GENERIC |
5935143d | 307 | void kasan_init_cache_meta(struct kmem_cache *cache, unsigned int *size); |
284f8590 | 308 | void kasan_init_object_meta(struct kmem_cache *cache, const void *object); |
2f356801 AK |
309 | struct kasan_alloc_meta *kasan_get_alloc_meta(struct kmem_cache *cache, |
310 | const void *object); | |
311 | struct kasan_free_meta *kasan_get_free_meta(struct kmem_cache *cache, | |
312 | const void *object); | |
284f8590 | 313 | #else |
5935143d | 314 | static inline void kasan_init_cache_meta(struct kmem_cache *cache, unsigned int *size) { } |
284f8590 | 315 | static inline void kasan_init_object_meta(struct kmem_cache *cache, const void *object) { } |
2f356801 AK |
316 | #endif |
317 | ||
7594b347 | 318 | depot_stack_handle_t kasan_save_stack(gfp_t flags, bool can_alloc); |
e4b7818b | 319 | void kasan_set_track(struct kasan_track *track, gfp_t flags); |
ccf643e6 | 320 | void kasan_save_alloc_info(struct kmem_cache *cache, void *object, gfp_t flags); |
6b074349 | 321 | void kasan_save_free_info(struct kmem_cache *cache, void *object); |
26e760c9 | 322 | |
2bd926b4 AK |
323 | #if defined(CONFIG_KASAN_GENERIC) && \ |
324 | (defined(CONFIG_SLAB) || defined(CONFIG_SLUB)) | |
f00748bf AK |
325 | bool kasan_quarantine_put(struct kmem_cache *cache, void *object); |
326 | void kasan_quarantine_reduce(void); | |
327 | void kasan_quarantine_remove_cache(struct kmem_cache *cache); | |
55834c59 | 328 | #else |
f00748bf AK |
329 | static inline bool kasan_quarantine_put(struct kmem_cache *cache, void *object) { return false; } |
330 | static inline void kasan_quarantine_reduce(void) { } | |
331 | static inline void kasan_quarantine_remove_cache(struct kmem_cache *cache) { } | |
55834c59 AP |
332 | #endif |
333 | ||
3c9e3aa1 | 334 | #ifndef arch_kasan_set_tag |
c412a769 QC |
335 | static inline const void *arch_kasan_set_tag(const void *addr, u8 tag) |
336 | { | |
337 | return addr; | |
338 | } | |
3c9e3aa1 | 339 | #endif |
3c9e3aa1 AK |
340 | #ifndef arch_kasan_get_tag |
341 | #define arch_kasan_get_tag(addr) 0 | |
342 | #endif | |
343 | ||
344 | #define set_tag(addr, tag) ((void *)arch_kasan_set_tag((addr), (tag))) | |
3c9e3aa1 AK |
345 | #define get_tag(addr) arch_kasan_get_tag(addr) |
346 | ||
ccbe2aab AK |
347 | #ifdef CONFIG_KASAN_HW_TAGS |
348 | ||
2603f8a7 VF |
349 | #ifndef arch_enable_tagging_sync |
350 | #define arch_enable_tagging_sync() | |
351 | #endif | |
352 | #ifndef arch_enable_tagging_async | |
353 | #define arch_enable_tagging_async() | |
ccbe2aab | 354 | #endif |
2d27e585 VF |
355 | #ifndef arch_enable_tagging_asymm |
356 | #define arch_enable_tagging_asymm() | |
357 | #endif | |
e80a76aa AK |
358 | #ifndef arch_force_async_tag_fault |
359 | #define arch_force_async_tag_fault() | |
360 | #endif | |
ccbe2aab AK |
361 | #ifndef arch_get_random_tag |
362 | #define arch_get_random_tag() (0xFF) | |
363 | #endif | |
364 | #ifndef arch_get_mem_tag | |
365 | #define arch_get_mem_tag(addr) (0xFF) | |
366 | #endif | |
367 | #ifndef arch_set_mem_tag_range | |
d9b6f907 | 368 | #define arch_set_mem_tag_range(addr, size, tag, init) ((void *)(addr)) |
ccbe2aab AK |
369 | #endif |
370 | ||
2603f8a7 VF |
371 | #define hw_enable_tagging_sync() arch_enable_tagging_sync() |
372 | #define hw_enable_tagging_async() arch_enable_tagging_async() | |
2d27e585 | 373 | #define hw_enable_tagging_asymm() arch_enable_tagging_asymm() |
e80a76aa | 374 | #define hw_force_async_tag_fault() arch_force_async_tag_fault() |
ccbe2aab AK |
375 | #define hw_get_random_tag() arch_get_random_tag() |
376 | #define hw_get_mem_tag(addr) arch_get_mem_tag(addr) | |
d9b6f907 AK |
377 | #define hw_set_mem_tag_range(addr, size, tag, init) \ |
378 | arch_set_mem_tag_range((addr), (size), (tag), (init)) | |
ccbe2aab | 379 | |
b1add418 VF |
380 | void kasan_enable_tagging(void); |
381 | ||
f05842cf AK |
382 | #else /* CONFIG_KASAN_HW_TAGS */ |
383 | ||
2603f8a7 VF |
384 | #define hw_enable_tagging_sync() |
385 | #define hw_enable_tagging_async() | |
2d27e585 | 386 | #define hw_enable_tagging_asymm() |
f05842cf | 387 | |
b1add418 VF |
388 | static inline void kasan_enable_tagging(void) { } |
389 | ||
ccbe2aab AK |
390 | #endif /* CONFIG_KASAN_HW_TAGS */ |
391 | ||
f05842cf AK |
392 | #if defined(CONFIG_KASAN_HW_TAGS) && IS_ENABLED(CONFIG_KASAN_KUNIT_TEST) |
393 | ||
e80a76aa | 394 | void kasan_force_async_fault(void); |
f05842cf | 395 | |
b1add418 | 396 | #else /* CONFIG_KASAN_HW_TAGS && CONFIG_KASAN_KUNIT_TEST */ |
f05842cf | 397 | |
e80a76aa | 398 | static inline void kasan_force_async_fault(void) { } |
f05842cf | 399 | |
b1add418 | 400 | #endif /* CONFIG_KASAN_HW_TAGS && CONFIG_KASAN_KUNIT_TEST */ |
f05842cf | 401 | |
d8dd3971 | 402 | #ifdef CONFIG_KASAN_SW_TAGS |
f00748bf | 403 | u8 kasan_random_tag(void); |
d8dd3971 | 404 | #elif defined(CONFIG_KASAN_HW_TAGS) |
f00748bf | 405 | static inline u8 kasan_random_tag(void) { return hw_get_random_tag(); } |
d8dd3971 | 406 | #else |
f00748bf | 407 | static inline u8 kasan_random_tag(void) { return 0; } |
d8dd3971 AK |
408 | #endif |
409 | ||
57345fa6 AK |
410 | #ifdef CONFIG_KASAN_HW_TAGS |
411 | ||
aa5c219c | 412 | static inline void kasan_poison(const void *addr, size_t size, u8 value, bool init) |
57345fa6 | 413 | { |
cde8a7eb | 414 | addr = kasan_reset_tag(addr); |
2b830526 AP |
415 | |
416 | /* Skip KFENCE memory if called explicitly outside of sl*b. */ | |
cde8a7eb | 417 | if (is_kfence_address(addr)) |
2b830526 AP |
418 | return; |
419 | ||
cde8a7eb AK |
420 | if (WARN_ON((unsigned long)addr & KASAN_GRANULE_MASK)) |
421 | return; | |
422 | if (WARN_ON(size & KASAN_GRANULE_MASK)) | |
423 | return; | |
424 | ||
aa5c219c | 425 | hw_set_mem_tag_range((void *)addr, size, value, init); |
57345fa6 AK |
426 | } |
427 | ||
aa5c219c | 428 | static inline void kasan_unpoison(const void *addr, size_t size, bool init) |
57345fa6 | 429 | { |
cde8a7eb | 430 | u8 tag = get_tag(addr); |
2b830526 | 431 | |
cde8a7eb | 432 | addr = kasan_reset_tag(addr); |
2b830526 AP |
433 | |
434 | /* Skip KFENCE memory if called explicitly outside of sl*b. */ | |
cde8a7eb AK |
435 | if (is_kfence_address(addr)) |
436 | return; | |
437 | ||
438 | if (WARN_ON((unsigned long)addr & KASAN_GRANULE_MASK)) | |
2b830526 | 439 | return; |
77a63c69 YL |
440 | /* |
441 | * Explicitly initialize the memory with the precise object size to | |
fc0e5b91 AK |
442 | * avoid overwriting the slab redzone. This disables initialization in |
443 | * the arch code and may thus lead to performance penalty. This penalty | |
444 | * does not affect production builds, as slab redzones are not enabled | |
445 | * there. | |
77a63c69 YL |
446 | */ |
447 | if (__slub_debug_enabled() && | |
448 | init && ((unsigned long)size & KASAN_GRANULE_MASK)) { | |
449 | init = false; | |
450 | memzero_explicit((void *)addr, size); | |
451 | } | |
cde8a7eb | 452 | size = round_up(size, KASAN_GRANULE_SIZE); |
2b830526 | 453 | |
aa5c219c | 454 | hw_set_mem_tag_range((void *)addr, size, tag, init); |
57345fa6 AK |
455 | } |
456 | ||
611806b4 | 457 | static inline bool kasan_byte_accessible(const void *addr) |
57345fa6 AK |
458 | { |
459 | u8 ptr_tag = get_tag(addr); | |
611806b4 | 460 | u8 mem_tag = hw_get_mem_tag((void *)addr); |
57345fa6 | 461 | |
bfcfe371 | 462 | return ptr_tag == KASAN_TAG_KERNEL || ptr_tag == mem_tag; |
57345fa6 AK |
463 | } |
464 | ||
465 | #else /* CONFIG_KASAN_HW_TAGS */ | |
466 | ||
e2db1a9a | 467 | /** |
f0953a1b | 468 | * kasan_poison - mark the memory range as inaccessible |
e2db1a9a | 469 | * @addr - range start address, must be aligned to KASAN_GRANULE_SIZE |
cde8a7eb | 470 | * @size - range size, must be aligned to KASAN_GRANULE_SIZE |
e2db1a9a | 471 | * @value - value that's written to metadata for the range |
aa5c219c | 472 | * @init - whether to initialize the memory range (only for hardware tag-based) |
e2db1a9a AK |
473 | * |
474 | * The size gets aligned to KASAN_GRANULE_SIZE before marking the range. | |
475 | */ | |
aa5c219c | 476 | void kasan_poison(const void *addr, size_t size, u8 value, bool init); |
e2db1a9a AK |
477 | |
478 | /** | |
479 | * kasan_unpoison - mark the memory range as accessible | |
480 | * @addr - range start address, must be aligned to KASAN_GRANULE_SIZE | |
cde8a7eb | 481 | * @size - range size, can be unaligned |
aa5c219c | 482 | * @init - whether to initialize the memory range (only for hardware tag-based) |
e2db1a9a AK |
483 | * |
484 | * For the tag-based modes, the @size gets aligned to KASAN_GRANULE_SIZE before | |
485 | * marking the range. | |
486 | * For the generic mode, the last granule of the memory range gets partially | |
487 | * unpoisoned based on the @size. | |
488 | */ | |
aa5c219c | 489 | void kasan_unpoison(const void *addr, size_t size, bool init); |
e2db1a9a | 490 | |
611806b4 | 491 | bool kasan_byte_accessible(const void *addr); |
57345fa6 AK |
492 | |
493 | #endif /* CONFIG_KASAN_HW_TAGS */ | |
494 | ||
e2db1a9a AK |
495 | #ifdef CONFIG_KASAN_GENERIC |
496 | ||
497 | /** | |
498 | * kasan_poison_last_granule - mark the last granule of the memory range as | |
f0953a1b | 499 | * inaccessible |
e2db1a9a AK |
500 | * @addr - range start address, must be aligned to KASAN_GRANULE_SIZE |
501 | * @size - range size | |
502 | * | |
503 | * This function is only available for the generic mode, as it's the only mode | |
504 | * that has partially poisoned memory granules. | |
505 | */ | |
506 | void kasan_poison_last_granule(const void *address, size_t size); | |
507 | ||
508 | #else /* CONFIG_KASAN_GENERIC */ | |
509 | ||
510 | static inline void kasan_poison_last_granule(const void *address, size_t size) { } | |
511 | ||
512 | #endif /* CONFIG_KASAN_GENERIC */ | |
513 | ||
af3751f3 DA |
514 | #ifndef kasan_arch_is_ready |
515 | static inline bool kasan_arch_is_ready(void) { return true; } | |
516 | #elif !defined(CONFIG_KASAN_GENERIC) || !defined(CONFIG_KASAN_OUTLINE) | |
517 | #error kasan_arch_is_ready only works in KASAN generic outline mode! | |
518 | #endif | |
519 | ||
80207910 AK |
520 | #if IS_ENABLED(CONFIG_KASAN_KUNIT_TEST) || IS_ENABLED(CONFIG_KASAN_MODULE_TEST) |
521 | ||
522 | bool kasan_save_enable_multi_shot(void); | |
523 | void kasan_restore_multi_shot(bool enabled); | |
524 | ||
525 | #endif | |
526 | ||
d321599c AP |
527 | /* |
528 | * Exported functions for interfaces called from assembly or from generated | |
fc0e5b91 | 529 | * code. Declared here to avoid warnings about missing declarations. |
d321599c | 530 | */ |
fc0e5b91 | 531 | |
d321599c AP |
532 | asmlinkage void kasan_unpoison_task_stack_below(const void *watermark); |
533 | void __asan_register_globals(struct kasan_global *globals, size_t size); | |
534 | void __asan_unregister_globals(struct kasan_global *globals, size_t size); | |
d321599c | 535 | void __asan_handle_no_return(void); |
d321599c AP |
536 | void __asan_alloca_poison(unsigned long addr, size_t size); |
537 | void __asan_allocas_unpoison(const void *stack_top, const void *stack_bottom); | |
538 | ||
539 | void __asan_load1(unsigned long addr); | |
540 | void __asan_store1(unsigned long addr); | |
541 | void __asan_load2(unsigned long addr); | |
542 | void __asan_store2(unsigned long addr); | |
543 | void __asan_load4(unsigned long addr); | |
544 | void __asan_store4(unsigned long addr); | |
545 | void __asan_load8(unsigned long addr); | |
546 | void __asan_store8(unsigned long addr); | |
547 | void __asan_load16(unsigned long addr); | |
548 | void __asan_store16(unsigned long addr); | |
13cf0488 AK |
549 | void __asan_loadN(unsigned long addr, size_t size); |
550 | void __asan_storeN(unsigned long addr, size_t size); | |
d321599c AP |
551 | |
552 | void __asan_load1_noabort(unsigned long addr); | |
553 | void __asan_store1_noabort(unsigned long addr); | |
554 | void __asan_load2_noabort(unsigned long addr); | |
555 | void __asan_store2_noabort(unsigned long addr); | |
556 | void __asan_load4_noabort(unsigned long addr); | |
557 | void __asan_store4_noabort(unsigned long addr); | |
558 | void __asan_load8_noabort(unsigned long addr); | |
559 | void __asan_store8_noabort(unsigned long addr); | |
560 | void __asan_load16_noabort(unsigned long addr); | |
561 | void __asan_store16_noabort(unsigned long addr); | |
13cf0488 AK |
562 | void __asan_loadN_noabort(unsigned long addr, size_t size); |
563 | void __asan_storeN_noabort(unsigned long addr, size_t size); | |
564 | ||
565 | void __asan_report_load1_noabort(unsigned long addr); | |
566 | void __asan_report_store1_noabort(unsigned long addr); | |
567 | void __asan_report_load2_noabort(unsigned long addr); | |
568 | void __asan_report_store2_noabort(unsigned long addr); | |
569 | void __asan_report_load4_noabort(unsigned long addr); | |
570 | void __asan_report_store4_noabort(unsigned long addr); | |
571 | void __asan_report_load8_noabort(unsigned long addr); | |
572 | void __asan_report_store8_noabort(unsigned long addr); | |
573 | void __asan_report_load16_noabort(unsigned long addr); | |
574 | void __asan_report_store16_noabort(unsigned long addr); | |
575 | void __asan_report_load_n_noabort(unsigned long addr, size_t size); | |
576 | void __asan_report_store_n_noabort(unsigned long addr, size_t size); | |
d321599c AP |
577 | |
578 | void __asan_set_shadow_00(const void *addr, size_t size); | |
579 | void __asan_set_shadow_f1(const void *addr, size_t size); | |
580 | void __asan_set_shadow_f2(const void *addr, size_t size); | |
581 | void __asan_set_shadow_f3(const void *addr, size_t size); | |
582 | void __asan_set_shadow_f5(const void *addr, size_t size); | |
583 | void __asan_set_shadow_f8(const void *addr, size_t size); | |
584 | ||
13cf0488 AK |
585 | void __hwasan_load1_noabort(unsigned long addr); |
586 | void __hwasan_store1_noabort(unsigned long addr); | |
587 | void __hwasan_load2_noabort(unsigned long addr); | |
588 | void __hwasan_store2_noabort(unsigned long addr); | |
589 | void __hwasan_load4_noabort(unsigned long addr); | |
590 | void __hwasan_store4_noabort(unsigned long addr); | |
591 | void __hwasan_load8_noabort(unsigned long addr); | |
592 | void __hwasan_store8_noabort(unsigned long addr); | |
593 | void __hwasan_load16_noabort(unsigned long addr); | |
594 | void __hwasan_store16_noabort(unsigned long addr); | |
595 | void __hwasan_loadN_noabort(unsigned long addr, size_t size); | |
596 | void __hwasan_storeN_noabort(unsigned long addr, size_t size); | |
597 | ||
598 | void __hwasan_tag_memory(unsigned long addr, u8 tag, unsigned long size); | |
599 | ||
fc0e5b91 | 600 | #endif /* __MM_KASAN_KASAN_H */ |