1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __MM_KASAN_KASAN_H
3#define __MM_KASAN_KASAN_H
4
5#include <linux/atomic.h>
6#include <linux/kasan.h>
7#include <linux/kasan-tags.h>
8#include <linux/kfence.h>
9#include <linux/stackdepot.h>
10
11#if defined(CONFIG_KASAN_SW_TAGS) || defined(CONFIG_KASAN_HW_TAGS)
12
13#include <linux/static_key.h>
14
15DECLARE_STATIC_KEY_TRUE(kasan_flag_stacktrace);
16
17static 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
24static 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
33#include "../slab.h"
34
35DECLARE_STATIC_KEY_TRUE(kasan_flag_vmalloc);
36
37enum kasan_mode {
38 KASAN_MODE_SYNC,
39 KASAN_MODE_ASYNC,
40 KASAN_MODE_ASYMM,
41};
42
43extern enum kasan_mode kasan_mode __ro_after_init;
44
45extern unsigned long kasan_page_alloc_sample;
46extern unsigned int kasan_page_alloc_sample_order;
47DECLARE_PER_CPU(long, kasan_page_alloc_skip);
48
49static inline bool kasan_vmalloc_enabled(void)
50{
51 return static_branch_likely(&kasan_flag_vmalloc);
52}
53
54static inline bool kasan_async_fault_possible(void)
55{
56 return kasan_mode == KASAN_MODE_ASYNC || kasan_mode == KASAN_MODE_ASYMM;
57}
58
59static inline bool kasan_sync_fault_possible(void)
60{
61 return kasan_mode == KASAN_MODE_SYNC || kasan_mode == KASAN_MODE_ASYMM;
62}
63
64static inline bool kasan_sample_page_alloc(unsigned int order)
65{
66 /* Fast-path for when sampling is disabled. */
67 if (kasan_page_alloc_sample == 1)
68 return true;
69
70 if (order < kasan_page_alloc_sample_order)
71 return true;
72
73 if (this_cpu_dec_return(kasan_page_alloc_skip) < 0) {
74 this_cpu_write(kasan_page_alloc_skip,
75 kasan_page_alloc_sample - 1);
76 return true;
77 }
78
79 return false;
80}
81
82#else /* CONFIG_KASAN_HW_TAGS */
83
84static inline bool kasan_async_fault_possible(void)
85{
86 return false;
87}
88
89static inline bool kasan_sync_fault_possible(void)
90{
91 return true;
92}
93
94static inline bool kasan_sample_page_alloc(unsigned int order)
95{
96 return true;
97}
98
99#endif /* CONFIG_KASAN_HW_TAGS */
100
101#ifdef CONFIG_KASAN_GENERIC
102
103/* Generic KASAN uses per-object metadata to store stack traces. */
104static inline bool kasan_requires_meta(void)
105{
106 /*
107 * Technically, Generic KASAN always collects stack traces right now.
108 * However, let's use kasan_stack_collection_enabled() in case the
109 * kasan.stacktrace command-line argument is changed to affect
110 * Generic KASAN.
111 */
112 return kasan_stack_collection_enabled();
113}
114
115#else /* CONFIG_KASAN_GENERIC */
116
117/* Tag-based KASAN modes do not use per-object metadata. */
118static inline bool kasan_requires_meta(void)
119{
120 return false;
121}
122
123#endif /* CONFIG_KASAN_GENERIC */
124
125#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
126#define KASAN_GRANULE_SIZE (1UL << KASAN_SHADOW_SCALE_SHIFT)
127#else
128#include <asm/mte-kasan.h>
129#define KASAN_GRANULE_SIZE MTE_GRANULE_SIZE
130#endif
131
132#define KASAN_GRANULE_MASK (KASAN_GRANULE_SIZE - 1)
133
134#define KASAN_MEMORY_PER_SHADOW_PAGE (KASAN_GRANULE_SIZE << PAGE_SHIFT)
135
136#ifdef CONFIG_KASAN_GENERIC
137#define KASAN_PAGE_FREE 0xFF /* freed page */
138#define KASAN_PAGE_REDZONE 0xFE /* redzone for kmalloc_large allocation */
139#define KASAN_SLAB_REDZONE 0xFC /* redzone for slab object */
140#define KASAN_SLAB_FREE 0xFB /* freed slab object */
141#define KASAN_VMALLOC_INVALID 0xF8 /* inaccessible space in vmap area */
142#else
143#define KASAN_PAGE_FREE KASAN_TAG_INVALID
144#define KASAN_PAGE_REDZONE KASAN_TAG_INVALID
145#define KASAN_SLAB_REDZONE KASAN_TAG_INVALID
146#define KASAN_SLAB_FREE KASAN_TAG_INVALID
147#define KASAN_VMALLOC_INVALID KASAN_TAG_INVALID /* only used for SW_TAGS */
148#endif
149
150#ifdef CONFIG_KASAN_GENERIC
151
152#define KASAN_SLAB_FREETRACK 0xFA /* freed slab object with free track */
153#define KASAN_GLOBAL_REDZONE 0xF9 /* redzone for global variable */
154
155/* Stack redzone shadow values. Compiler ABI, do not change. */
156#define KASAN_STACK_LEFT 0xF1
157#define KASAN_STACK_MID 0xF2
158#define KASAN_STACK_RIGHT 0xF3
159#define KASAN_STACK_PARTIAL 0xF4
160
161/* alloca redzone shadow values. */
162#define KASAN_ALLOCA_LEFT 0xCA
163#define KASAN_ALLOCA_RIGHT 0xCB
164
165/* alloca redzone size. Compiler ABI, do not change. */
166#define KASAN_ALLOCA_REDZONE_SIZE 32
167
168/* Stack frame marker. Compiler ABI, do not change. */
169#define KASAN_CURRENT_STACK_FRAME_MAGIC 0x41B58AB3
170
171/* Dummy value to avoid breaking randconfig/all*config builds. */
172#ifndef KASAN_ABI_VERSION
173#define KASAN_ABI_VERSION 1
174#endif
175
176#endif /* CONFIG_KASAN_GENERIC */
177
178/* Metadata layout customization. */
179#define META_BYTES_PER_BLOCK 1
180#define META_BLOCKS_PER_ROW 16
181#define META_BYTES_PER_ROW (META_BLOCKS_PER_ROW * META_BYTES_PER_BLOCK)
182#define META_MEM_BYTES_PER_ROW (META_BYTES_PER_ROW * KASAN_GRANULE_SIZE)
183#define META_ROWS_AROUND_ADDR 2
184
185#define KASAN_STACK_DEPTH 64
186
187struct kasan_track {
188 u32 pid;
189 depot_stack_handle_t stack;
190};
191
192enum kasan_report_type {
193 KASAN_REPORT_ACCESS,
194 KASAN_REPORT_INVALID_FREE,
195 KASAN_REPORT_DOUBLE_FREE,
196};
197
198struct kasan_report_info {
199 /* Filled in by kasan_report_*(). */
200 enum kasan_report_type type;
201 const void *access_addr;
202 size_t access_size;
203 bool is_write;
204 unsigned long ip;
205
206 /* Filled in by the common reporting code. */
207 const void *first_bad_addr;
208 struct kmem_cache *cache;
209 void *object;
210 size_t alloc_size;
211
212 /* Filled in by the mode-specific reporting code. */
213 const char *bug_type;
214 struct kasan_track alloc_track;
215 struct kasan_track free_track;
216};
217
218/* Do not change the struct layout: compiler ABI. */
219struct kasan_source_location {
220 const char *filename;
221 int line_no;
222 int column_no;
223};
224
225/* Do not change the struct layout: compiler ABI. */
226struct kasan_global {
227 const void *beg; /* Address of the beginning of the global variable. */
228 size_t size; /* Size of the global variable. */
229 size_t size_with_redzone; /* Size of the variable + size of the redzone. 32 bytes aligned. */
230 const void *name;
231 const void *module_name; /* Name of the module where the global variable is declared. */
232 unsigned long has_dynamic_init; /* This is needed for C++. */
233#if KASAN_ABI_VERSION >= 4
234 struct kasan_source_location *location;
235#endif
236#if KASAN_ABI_VERSION >= 5
237 char *odr_indicator;
238#endif
239};
240
241/* Structures for keeping alloc and free meta. */
242
243#ifdef CONFIG_KASAN_GENERIC
244
245struct kasan_alloc_meta {
246 struct kasan_track alloc_track;
247 /* Free track is stored in kasan_free_meta. */
248 depot_stack_handle_t aux_stack[2];
249};
250
251struct qlist_node {
252 struct qlist_node *next;
253};
254
255/*
256 * Free meta is stored either in the object itself or in the redzone after the
257 * object. In the former case, free meta offset is 0. In the latter case, the
258 * offset is between 0 and INT_MAX. INT_MAX marks that free meta is not present.
259 */
260#define KASAN_NO_FREE_META INT_MAX
261
262/*
263 * Free meta is only used by Generic mode while the object is in quarantine.
264 * After that, slab allocator stores the freelist pointer in the object.
265 */
266struct kasan_free_meta {
267 struct qlist_node quarantine_link;
268 struct kasan_track free_track;
269};
270
271#endif /* CONFIG_KASAN_GENERIC */
272
273#if defined(CONFIG_KASAN_SW_TAGS) || defined(CONFIG_KASAN_HW_TAGS)
274
275struct kasan_stack_ring_entry {
276 void *ptr;
277 size_t size;
278 u32 pid;
279 depot_stack_handle_t stack;
280 bool is_free;
281};
282
283struct kasan_stack_ring {
284 rwlock_t lock;
285 size_t size;
286 atomic64_t pos;
287 struct kasan_stack_ring_entry *entries;
288};
289
290#endif /* CONFIG_KASAN_SW_TAGS || CONFIG_KASAN_HW_TAGS */
291
292#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
293
294#ifndef kasan_shadow_to_mem
295static inline const void *kasan_shadow_to_mem(const void *shadow_addr)
296{
297 return (void *)(((unsigned long)shadow_addr - KASAN_SHADOW_OFFSET)
298 << KASAN_SHADOW_SCALE_SHIFT);
299}
300#endif
301
302#ifndef addr_has_metadata
303static __always_inline bool addr_has_metadata(const void *addr)
304{
305 return (kasan_reset_tag(addr) >=
306 kasan_shadow_to_mem((void *)KASAN_SHADOW_START));
307}
308#endif
309
310/**
311 * kasan_check_range - Check memory region, and report if invalid access.
312 * @addr: the accessed address
313 * @size: the accessed size
314 * @write: true if access is a write access
315 * @ret_ip: return address
316 * @return: true if access was valid, false if invalid
317 */
318bool kasan_check_range(const void *addr, size_t size, bool write,
319 unsigned long ret_ip);
320
321#else /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */
322
323static __always_inline bool addr_has_metadata(const void *addr)
324{
325 return (is_vmalloc_addr(x: addr) || virt_addr_valid(addr));
326}
327
328#endif /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */
329
330const void *kasan_find_first_bad_addr(const void *addr, size_t size);
331size_t kasan_get_alloc_size(void *object, struct kmem_cache *cache);
332void kasan_complete_mode_report_info(struct kasan_report_info *info);
333void kasan_metadata_fetch_row(char *buffer, void *row);
334
335#if defined(CONFIG_KASAN_SW_TAGS) || defined(CONFIG_KASAN_HW_TAGS)
336void kasan_print_tags(u8 addr_tag, const void *addr);
337#else
338static inline void kasan_print_tags(u8 addr_tag, const void *addr) { }
339#endif
340
341#if defined(CONFIG_KASAN_STACK)
342void kasan_print_address_stack_frame(const void *addr);
343#else
344static inline void kasan_print_address_stack_frame(const void *addr) { }
345#endif
346
347#ifdef CONFIG_KASAN_GENERIC
348void kasan_print_aux_stacks(struct kmem_cache *cache, const void *object);
349#else
350static inline void kasan_print_aux_stacks(struct kmem_cache *cache, const void *object) { }
351#endif
352
353bool kasan_report(const void *addr, size_t size,
354 bool is_write, unsigned long ip);
355void kasan_report_invalid_free(void *object, unsigned long ip, enum kasan_report_type type);
356
357struct slab *kasan_addr_to_slab(const void *addr);
358
359#ifdef CONFIG_KASAN_GENERIC
360void kasan_init_cache_meta(struct kmem_cache *cache, unsigned int *size);
361void kasan_init_object_meta(struct kmem_cache *cache, const void *object);
362struct kasan_alloc_meta *kasan_get_alloc_meta(struct kmem_cache *cache,
363 const void *object);
364struct kasan_free_meta *kasan_get_free_meta(struct kmem_cache *cache,
365 const void *object);
366#else
367static inline void kasan_init_cache_meta(struct kmem_cache *cache, unsigned int *size) { }
368static inline void kasan_init_object_meta(struct kmem_cache *cache, const void *object) { }
369#endif
370
371depot_stack_handle_t kasan_save_stack(gfp_t flags, bool can_alloc);
372void kasan_set_track(struct kasan_track *track, gfp_t flags);
373void kasan_save_alloc_info(struct kmem_cache *cache, void *object, gfp_t flags);
374void kasan_save_free_info(struct kmem_cache *cache, void *object);
375
376#if defined(CONFIG_KASAN_GENERIC) && \
377 (defined(CONFIG_SLAB) || defined(CONFIG_SLUB))
378bool kasan_quarantine_put(struct kmem_cache *cache, void *object);
379void kasan_quarantine_reduce(void);
380void kasan_quarantine_remove_cache(struct kmem_cache *cache);
381#else
382static inline bool kasan_quarantine_put(struct kmem_cache *cache, void *object) { return false; }
383static inline void kasan_quarantine_reduce(void) { }
384static inline void kasan_quarantine_remove_cache(struct kmem_cache *cache) { }
385#endif
386
387#ifndef arch_kasan_set_tag
388static inline const void *arch_kasan_set_tag(const void *addr, u8 tag)
389{
390 return addr;
391}
392#endif
393#ifndef arch_kasan_get_tag
394#define arch_kasan_get_tag(addr) 0
395#endif
396
397#define set_tag(addr, tag) ((void *)arch_kasan_set_tag((addr), (tag)))
398#define get_tag(addr) arch_kasan_get_tag(addr)
399
400#ifdef CONFIG_KASAN_HW_TAGS
401
402#define hw_enable_tag_checks_sync() arch_enable_tag_checks_sync()
403#define hw_enable_tag_checks_async() arch_enable_tag_checks_async()
404#define hw_enable_tag_checks_asymm() arch_enable_tag_checks_asymm()
405#define hw_suppress_tag_checks_start() arch_suppress_tag_checks_start()
406#define hw_suppress_tag_checks_stop() arch_suppress_tag_checks_stop()
407#define hw_force_async_tag_fault() arch_force_async_tag_fault()
408#define hw_get_random_tag() arch_get_random_tag()
409#define hw_get_mem_tag(addr) arch_get_mem_tag(addr)
410#define hw_set_mem_tag_range(addr, size, tag, init) \
411 arch_set_mem_tag_range((addr), (size), (tag), (init))
412
413void kasan_enable_hw_tags(void);
414
415#else /* CONFIG_KASAN_HW_TAGS */
416
417static inline void kasan_enable_hw_tags(void) { }
418
419#endif /* CONFIG_KASAN_HW_TAGS */
420
421#if defined(CONFIG_KASAN_SW_TAGS) || defined(CONFIG_KASAN_HW_TAGS)
422void __init kasan_init_tags(void);
423#endif /* CONFIG_KASAN_SW_TAGS || CONFIG_KASAN_HW_TAGS */
424
425#if defined(CONFIG_KASAN_HW_TAGS) && IS_ENABLED(CONFIG_KASAN_KUNIT_TEST)
426
427void kasan_force_async_fault(void);
428
429#else /* CONFIG_KASAN_HW_TAGS && CONFIG_KASAN_KUNIT_TEST */
430
431static inline void kasan_force_async_fault(void) { }
432
433#endif /* CONFIG_KASAN_HW_TAGS && CONFIG_KASAN_KUNIT_TEST */
434
435#ifdef CONFIG_KASAN_SW_TAGS
436u8 kasan_random_tag(void);
437#elif defined(CONFIG_KASAN_HW_TAGS)
438static inline u8 kasan_random_tag(void) { return hw_get_random_tag(); }
439#else
440static inline u8 kasan_random_tag(void) { return 0; }
441#endif
442
443#ifdef CONFIG_KASAN_HW_TAGS
444
445static inline void kasan_poison(const void *addr, size_t size, u8 value, bool init)
446{
447 addr = kasan_reset_tag(addr);
448
449 /* Skip KFENCE memory if called explicitly outside of sl*b. */
450 if (is_kfence_address(addr))
451 return;
452
453 if (WARN_ON((unsigned long)addr & KASAN_GRANULE_MASK))
454 return;
455 if (WARN_ON(size & KASAN_GRANULE_MASK))
456 return;
457
458 hw_set_mem_tag_range((void *)addr, size, value, init);
459}
460
461static inline void kasan_unpoison(const void *addr, size_t size, bool init)
462{
463 u8 tag = get_tag(addr);
464
465 addr = kasan_reset_tag(addr);
466
467 /* Skip KFENCE memory if called explicitly outside of sl*b. */
468 if (is_kfence_address(addr))
469 return;
470
471 if (WARN_ON((unsigned long)addr & KASAN_GRANULE_MASK))
472 return;
473 size = round_up(size, KASAN_GRANULE_SIZE);
474
475 hw_set_mem_tag_range((void *)addr, size, tag, init);
476}
477
478static inline bool kasan_byte_accessible(const void *addr)
479{
480 u8 ptr_tag = get_tag(addr);
481 u8 mem_tag = hw_get_mem_tag((void *)addr);
482
483 return ptr_tag == KASAN_TAG_KERNEL || ptr_tag == mem_tag;
484}
485
486#else /* CONFIG_KASAN_HW_TAGS */
487
488/**
489 * kasan_poison - mark the memory range as inaccessible
490 * @addr - range start address, must be aligned to KASAN_GRANULE_SIZE
491 * @size - range size, must be aligned to KASAN_GRANULE_SIZE
492 * @value - value that's written to metadata for the range
493 * @init - whether to initialize the memory range (only for hardware tag-based)
494 *
495 * The size gets aligned to KASAN_GRANULE_SIZE before marking the range.
496 */
497void kasan_poison(const void *addr, size_t size, u8 value, bool init);
498
499/**
500 * kasan_unpoison - mark the memory range as accessible
501 * @addr - range start address, must be aligned to KASAN_GRANULE_SIZE
502 * @size - range size, can be unaligned
503 * @init - whether to initialize the memory range (only for hardware tag-based)
504 *
505 * For the tag-based modes, the @size gets aligned to KASAN_GRANULE_SIZE before
506 * marking the range.
507 * For the generic mode, the last granule of the memory range gets partially
508 * unpoisoned based on the @size.
509 */
510void kasan_unpoison(const void *addr, size_t size, bool init);
511
512bool kasan_byte_accessible(const void *addr);
513
514#endif /* CONFIG_KASAN_HW_TAGS */
515
516#ifdef CONFIG_KASAN_GENERIC
517
518/**
519 * kasan_poison_last_granule - mark the last granule of the memory range as
520 * inaccessible
521 * @addr - range start address, must be aligned to KASAN_GRANULE_SIZE
522 * @size - range size
523 *
524 * This function is only available for the generic mode, as it's the only mode
525 * that has partially poisoned memory granules.
526 */
527void kasan_poison_last_granule(const void *address, size_t size);
528
529#else /* CONFIG_KASAN_GENERIC */
530
531static inline void kasan_poison_last_granule(const void *address, size_t size) { }
532
533#endif /* CONFIG_KASAN_GENERIC */
534
535#ifndef kasan_arch_is_ready
536static inline bool kasan_arch_is_ready(void) { return true; }
537#elif !defined(CONFIG_KASAN_GENERIC) || !defined(CONFIG_KASAN_OUTLINE)
538#error kasan_arch_is_ready only works in KASAN generic outline mode!
539#endif
540
541#if IS_ENABLED(CONFIG_KASAN_KUNIT_TEST)
542
543void kasan_kunit_test_suite_start(void);
544void kasan_kunit_test_suite_end(void);
545
546#else /* CONFIG_KASAN_KUNIT_TEST */
547
548static inline void kasan_kunit_test_suite_start(void) { }
549static inline void kasan_kunit_test_suite_end(void) { }
550
551#endif /* CONFIG_KASAN_KUNIT_TEST */
552
553#if IS_ENABLED(CONFIG_KASAN_KUNIT_TEST) || IS_ENABLED(CONFIG_KASAN_MODULE_TEST)
554
555bool kasan_save_enable_multi_shot(void);
556void kasan_restore_multi_shot(bool enabled);
557
558#endif
559
560/*
561 * Exported functions for interfaces called from assembly or from generated
562 * code. Declared here to avoid warnings about missing declarations.
563 */
564
565void __asan_register_globals(void *globals, ssize_t size);
566void __asan_unregister_globals(void *globals, ssize_t size);
567void __asan_handle_no_return(void);
568void __asan_alloca_poison(void *, ssize_t size);
569void __asan_allocas_unpoison(void *stack_top, ssize_t stack_bottom);
570
571void __asan_load1(void *);
572void __asan_store1(void *);
573void __asan_load2(void *);
574void __asan_store2(void *);
575void __asan_load4(void *);
576void __asan_store4(void *);
577void __asan_load8(void *);
578void __asan_store8(void *);
579void __asan_load16(void *);
580void __asan_store16(void *);
581void __asan_loadN(void *, ssize_t size);
582void __asan_storeN(void *, ssize_t size);
583
584void __asan_load1_noabort(void *);
585void __asan_store1_noabort(void *);
586void __asan_load2_noabort(void *);
587void __asan_store2_noabort(void *);
588void __asan_load4_noabort(void *);
589void __asan_store4_noabort(void *);
590void __asan_load8_noabort(void *);
591void __asan_store8_noabort(void *);
592void __asan_load16_noabort(void *);
593void __asan_store16_noabort(void *);
594void __asan_loadN_noabort(void *, ssize_t size);
595void __asan_storeN_noabort(void *, ssize_t size);
596
597void __asan_report_load1_noabort(void *);
598void __asan_report_store1_noabort(void *);
599void __asan_report_load2_noabort(void *);
600void __asan_report_store2_noabort(void *);
601void __asan_report_load4_noabort(void *);
602void __asan_report_store4_noabort(void *);
603void __asan_report_load8_noabort(void *);
604void __asan_report_store8_noabort(void *);
605void __asan_report_load16_noabort(void *);
606void __asan_report_store16_noabort(void *);
607void __asan_report_load_n_noabort(void *, ssize_t size);
608void __asan_report_store_n_noabort(void *, ssize_t size);
609
610void __asan_set_shadow_00(const void *addr, ssize_t size);
611void __asan_set_shadow_f1(const void *addr, ssize_t size);
612void __asan_set_shadow_f2(const void *addr, ssize_t size);
613void __asan_set_shadow_f3(const void *addr, ssize_t size);
614void __asan_set_shadow_f5(const void *addr, ssize_t size);
615void __asan_set_shadow_f8(const void *addr, ssize_t size);
616
617void *__asan_memset(void *addr, int c, ssize_t len);
618void *__asan_memmove(void *dest, const void *src, ssize_t len);
619void *__asan_memcpy(void *dest, const void *src, ssize_t len);
620
621void __hwasan_load1_noabort(void *);
622void __hwasan_store1_noabort(void *);
623void __hwasan_load2_noabort(void *);
624void __hwasan_store2_noabort(void *);
625void __hwasan_load4_noabort(void *);
626void __hwasan_store4_noabort(void *);
627void __hwasan_load8_noabort(void *);
628void __hwasan_store8_noabort(void *);
629void __hwasan_load16_noabort(void *);
630void __hwasan_store16_noabort(void *);
631void __hwasan_loadN_noabort(void *, ssize_t size);
632void __hwasan_storeN_noabort(void *, ssize_t size);
633
634void __hwasan_tag_memory(void *, u8 tag, ssize_t size);
635
636void *__hwasan_memset(void *addr, int c, ssize_t len);
637void *__hwasan_memmove(void *dest, const void *src, ssize_t len);
638void *__hwasan_memcpy(void *dest, const void *src, ssize_t len);
639
640void kasan_tag_mismatch(void *addr, unsigned long access_info,
641 unsigned long ret_ip);
642
643#endif /* __MM_KASAN_KASAN_H */
644

source code of linux/mm/kasan/kasan.h