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/kasan-tags.h>
7 #include <linux/kfence.h>
8 #include <linux/stackdepot.h>
10 #ifdef CONFIG_KASAN_HW_TAGS
12 #include <linux/static_key.h>
15 DECLARE_STATIC_KEY_FALSE(kasan_flag_stacktrace);
16 extern bool kasan_flag_async __ro_after_init;
18 static inline bool kasan_stack_collection_enabled(void)
20 return static_branch_unlikely(&kasan_flag_stacktrace);
23 static inline bool kasan_async_mode_enabled(void)
25 return kasan_flag_async;
29 static inline bool kasan_stack_collection_enabled(void)
34 static inline bool kasan_async_mode_enabled(void)
41 #if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
42 #define KASAN_GRANULE_SIZE (1UL << KASAN_SHADOW_SCALE_SHIFT)
44 #include <asm/mte-kasan.h>
45 #define KASAN_GRANULE_SIZE MTE_GRANULE_SIZE
48 #define KASAN_GRANULE_MASK (KASAN_GRANULE_SIZE - 1)
50 #define KASAN_MEMORY_PER_SHADOW_PAGE (KASAN_GRANULE_SIZE << PAGE_SHIFT)
52 #ifdef CONFIG_KASAN_GENERIC
53 #define KASAN_FREE_PAGE 0xFF /* page was freed */
54 #define KASAN_PAGE_REDZONE 0xFE /* redzone for kmalloc_large allocations */
55 #define KASAN_KMALLOC_REDZONE 0xFC /* redzone inside slub object */
56 #define KASAN_KMALLOC_FREE 0xFB /* object was freed (kmem_cache_free/kfree) */
57 #define KASAN_KMALLOC_FREETRACK 0xFA /* object was freed and has free track set */
59 #define KASAN_FREE_PAGE KASAN_TAG_INVALID
60 #define KASAN_PAGE_REDZONE KASAN_TAG_INVALID
61 #define KASAN_KMALLOC_REDZONE KASAN_TAG_INVALID
62 #define KASAN_KMALLOC_FREE KASAN_TAG_INVALID
63 #define KASAN_KMALLOC_FREETRACK KASAN_TAG_INVALID
66 #define KASAN_GLOBAL_REDZONE 0xF9 /* redzone for global variable */
67 #define KASAN_VMALLOC_INVALID 0xF8 /* unallocated space in vmapped page */
70 * Stack redzone shadow values
71 * (Those are compiler's ABI, don't change them)
73 #define KASAN_STACK_LEFT 0xF1
74 #define KASAN_STACK_MID 0xF2
75 #define KASAN_STACK_RIGHT 0xF3
76 #define KASAN_STACK_PARTIAL 0xF4
79 * alloca redzone shadow values
81 #define KASAN_ALLOCA_LEFT 0xCA
82 #define KASAN_ALLOCA_RIGHT 0xCB
84 #define KASAN_ALLOCA_REDZONE_SIZE 32
87 * Stack frame marker (compiler ABI).
89 #define KASAN_CURRENT_STACK_FRAME_MAGIC 0x41B58AB3
91 /* Don't break randconfig/all*config builds */
92 #ifndef KASAN_ABI_VERSION
93 #define KASAN_ABI_VERSION 1
96 /* Metadata layout customization. */
97 #define META_BYTES_PER_BLOCK 1
98 #define META_BLOCKS_PER_ROW 16
99 #define META_BYTES_PER_ROW (META_BLOCKS_PER_ROW * META_BYTES_PER_BLOCK)
100 #define META_MEM_BYTES_PER_ROW (META_BYTES_PER_ROW * KASAN_GRANULE_SIZE)
101 #define META_ROWS_AROUND_ADDR 2
103 struct kasan_access_info {
104 const void *access_addr;
105 const void *first_bad_addr;
111 /* The layout of struct dictated by compiler */
112 struct kasan_source_location {
113 const char *filename;
118 /* The layout of struct dictated by compiler */
119 struct kasan_global {
120 const void *beg; /* Address of the beginning of the global variable. */
121 size_t size; /* Size of the global variable. */
122 size_t size_with_redzone; /* Size of the variable + size of the red zone. 32 bytes aligned */
124 const void *module_name; /* Name of the module where the global variable is declared. */
125 unsigned long has_dynamic_init; /* This needed for C++ */
126 #if KASAN_ABI_VERSION >= 4
127 struct kasan_source_location *location;
129 #if KASAN_ABI_VERSION >= 5
135 * Structures to keep alloc and free tracks *
138 #define KASAN_STACK_DEPTH 64
142 depot_stack_handle_t stack;
145 #if defined(CONFIG_KASAN_TAGS_IDENTIFY) && defined(CONFIG_KASAN_SW_TAGS)
146 #define KASAN_NR_FREE_STACKS 5
148 #define KASAN_NR_FREE_STACKS 1
151 struct kasan_alloc_meta {
152 struct kasan_track alloc_track;
153 #ifdef CONFIG_KASAN_GENERIC
155 * The auxiliary stack is stored into struct kasan_alloc_meta.
156 * The free stack is stored into struct kasan_free_meta.
158 depot_stack_handle_t aux_stack[2];
160 struct kasan_track free_track[KASAN_NR_FREE_STACKS];
162 #ifdef CONFIG_KASAN_TAGS_IDENTIFY
163 u8 free_pointer_tag[KASAN_NR_FREE_STACKS];
169 struct qlist_node *next;
173 * Generic mode either stores free meta in the object itself or in the redzone
174 * after the object. In the former case free meta offset is 0, in the latter
175 * case it has some sane value smaller than INT_MAX. Use INT_MAX as free meta
176 * offset when free meta isn't present.
178 #define KASAN_NO_FREE_META INT_MAX
180 struct kasan_free_meta {
181 #ifdef CONFIG_KASAN_GENERIC
182 /* This field is used while the object is in the quarantine.
183 * Otherwise it might be used for the allocator freelist.
185 struct qlist_node quarantine_link;
186 struct kasan_track free_track;
190 struct kasan_alloc_meta *kasan_get_alloc_meta(struct kmem_cache *cache,
192 #ifdef CONFIG_KASAN_GENERIC
193 struct kasan_free_meta *kasan_get_free_meta(struct kmem_cache *cache,
197 #if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
199 static inline const void *kasan_shadow_to_mem(const void *shadow_addr)
201 return (void *)(((unsigned long)shadow_addr - KASAN_SHADOW_OFFSET)
202 << KASAN_SHADOW_SCALE_SHIFT);
205 static inline bool addr_has_metadata(const void *addr)
207 return (addr >= kasan_shadow_to_mem((void *)KASAN_SHADOW_START));
211 * kasan_check_range - Check memory region, and report if invalid access.
212 * @addr: the accessed address
213 * @size: the accessed size
214 * @write: true if access is a write access
215 * @ret_ip: return address
216 * @return: true if access was valid, false if invalid
218 bool kasan_check_range(unsigned long addr, size_t size, bool write,
219 unsigned long ret_ip);
221 #else /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */
223 static inline bool addr_has_metadata(const void *addr)
225 return (is_vmalloc_addr(addr) || virt_addr_valid(addr));
228 #endif /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */
230 #if defined(CONFIG_KASAN_SW_TAGS) || defined(CONFIG_KASAN_HW_TAGS)
231 void kasan_print_tags(u8 addr_tag, const void *addr);
233 static inline void kasan_print_tags(u8 addr_tag, const void *addr) { }
236 void *kasan_find_first_bad_addr(void *addr, size_t size);
237 const char *kasan_get_bug_type(struct kasan_access_info *info);
238 void kasan_metadata_fetch_row(char *buffer, void *row);
240 #if defined(CONFIG_KASAN_GENERIC) && defined(CONFIG_KASAN_STACK)
241 void kasan_print_address_stack_frame(const void *addr);
243 static inline void kasan_print_address_stack_frame(const void *addr) { }
246 bool kasan_report(unsigned long addr, size_t size,
247 bool is_write, unsigned long ip);
248 void kasan_report_invalid_free(void *object, unsigned long ip);
250 struct page *kasan_addr_to_page(const void *addr);
252 depot_stack_handle_t kasan_save_stack(gfp_t flags);
253 void kasan_set_track(struct kasan_track *track, gfp_t flags);
254 void kasan_set_free_info(struct kmem_cache *cache, void *object, u8 tag);
255 struct kasan_track *kasan_get_free_track(struct kmem_cache *cache,
256 void *object, u8 tag);
258 #if defined(CONFIG_KASAN_GENERIC) && \
259 (defined(CONFIG_SLAB) || defined(CONFIG_SLUB))
260 bool kasan_quarantine_put(struct kmem_cache *cache, void *object);
261 void kasan_quarantine_reduce(void);
262 void kasan_quarantine_remove_cache(struct kmem_cache *cache);
264 static inline bool kasan_quarantine_put(struct kmem_cache *cache, void *object) { return false; }
265 static inline void kasan_quarantine_reduce(void) { }
266 static inline void kasan_quarantine_remove_cache(struct kmem_cache *cache) { }
269 #ifndef arch_kasan_set_tag
270 static inline const void *arch_kasan_set_tag(const void *addr, u8 tag)
275 #ifndef arch_kasan_get_tag
276 #define arch_kasan_get_tag(addr) 0
279 #define set_tag(addr, tag) ((void *)arch_kasan_set_tag((addr), (tag)))
280 #define get_tag(addr) arch_kasan_get_tag(addr)
282 #ifdef CONFIG_KASAN_HW_TAGS
284 #ifndef arch_enable_tagging_sync
285 #define arch_enable_tagging_sync()
287 #ifndef arch_enable_tagging_async
288 #define arch_enable_tagging_async()
290 #ifndef arch_force_async_tag_fault
291 #define arch_force_async_tag_fault()
293 #ifndef arch_get_random_tag
294 #define arch_get_random_tag() (0xFF)
296 #ifndef arch_get_mem_tag
297 #define arch_get_mem_tag(addr) (0xFF)
299 #ifndef arch_set_mem_tag_range
300 #define arch_set_mem_tag_range(addr, size, tag, init) ((void *)(addr))
303 #define hw_enable_tagging_sync() arch_enable_tagging_sync()
304 #define hw_enable_tagging_async() arch_enable_tagging_async()
305 #define hw_force_async_tag_fault() arch_force_async_tag_fault()
306 #define hw_get_random_tag() arch_get_random_tag()
307 #define hw_get_mem_tag(addr) arch_get_mem_tag(addr)
308 #define hw_set_mem_tag_range(addr, size, tag, init) \
309 arch_set_mem_tag_range((addr), (size), (tag), (init))
311 #else /* CONFIG_KASAN_HW_TAGS */
313 #define hw_enable_tagging_sync()
314 #define hw_enable_tagging_async()
316 #endif /* CONFIG_KASAN_HW_TAGS */
318 #if defined(CONFIG_KASAN_HW_TAGS) && IS_ENABLED(CONFIG_KASAN_KUNIT_TEST)
320 void kasan_enable_tagging_sync(void);
321 void kasan_force_async_fault(void);
323 #else /* CONFIG_KASAN_HW_TAGS || CONFIG_KASAN_KUNIT_TEST */
325 static inline void kasan_enable_tagging_sync(void) { }
326 static inline void kasan_force_async_fault(void) { }
328 #endif /* CONFIG_KASAN_HW_TAGS || CONFIG_KASAN_KUNIT_TEST */
330 #ifdef CONFIG_KASAN_SW_TAGS
331 u8 kasan_random_tag(void);
332 #elif defined(CONFIG_KASAN_HW_TAGS)
333 static inline u8 kasan_random_tag(void) { return hw_get_random_tag(); }
335 static inline u8 kasan_random_tag(void) { return 0; }
338 #ifdef CONFIG_KASAN_HW_TAGS
340 static inline void kasan_poison(const void *addr, size_t size, u8 value, bool init)
342 addr = kasan_reset_tag(addr);
344 /* Skip KFENCE memory if called explicitly outside of sl*b. */
345 if (is_kfence_address(addr))
348 if (WARN_ON((unsigned long)addr & KASAN_GRANULE_MASK))
350 if (WARN_ON(size & KASAN_GRANULE_MASK))
353 hw_set_mem_tag_range((void *)addr, size, value, init);
356 static inline void kasan_unpoison(const void *addr, size_t size, bool init)
358 u8 tag = get_tag(addr);
360 addr = kasan_reset_tag(addr);
362 /* Skip KFENCE memory if called explicitly outside of sl*b. */
363 if (is_kfence_address(addr))
366 if (WARN_ON((unsigned long)addr & KASAN_GRANULE_MASK))
369 * Explicitly initialize the memory with the precise object size to
370 * avoid overwriting the SLAB redzone. This disables initialization in
371 * the arch code and may thus lead to performance penalty. The penalty
372 * is accepted since SLAB redzones aren't enabled in production builds.
374 if (__slub_debug_enabled() &&
375 init && ((unsigned long)size & KASAN_GRANULE_MASK)) {
377 memzero_explicit((void *)addr, size);
379 size = round_up(size, KASAN_GRANULE_SIZE);
381 hw_set_mem_tag_range((void *)addr, size, tag, init);
384 static inline bool kasan_byte_accessible(const void *addr)
386 u8 ptr_tag = get_tag(addr);
387 u8 mem_tag = hw_get_mem_tag((void *)addr);
389 return ptr_tag == KASAN_TAG_KERNEL || ptr_tag == mem_tag;
392 #else /* CONFIG_KASAN_HW_TAGS */
395 * kasan_poison - mark the memory range as inaccessible
396 * @addr - range start address, must be aligned to KASAN_GRANULE_SIZE
397 * @size - range size, must be aligned to KASAN_GRANULE_SIZE
398 * @value - value that's written to metadata for the range
399 * @init - whether to initialize the memory range (only for hardware tag-based)
401 * The size gets aligned to KASAN_GRANULE_SIZE before marking the range.
403 void kasan_poison(const void *addr, size_t size, u8 value, bool init);
406 * kasan_unpoison - mark the memory range as accessible
407 * @addr - range start address, must be aligned to KASAN_GRANULE_SIZE
408 * @size - range size, can be unaligned
409 * @init - whether to initialize the memory range (only for hardware tag-based)
411 * For the tag-based modes, the @size gets aligned to KASAN_GRANULE_SIZE before
413 * For the generic mode, the last granule of the memory range gets partially
414 * unpoisoned based on the @size.
416 void kasan_unpoison(const void *addr, size_t size, bool init);
418 bool kasan_byte_accessible(const void *addr);
420 #endif /* CONFIG_KASAN_HW_TAGS */
422 #ifdef CONFIG_KASAN_GENERIC
425 * kasan_poison_last_granule - mark the last granule of the memory range as
427 * @addr - range start address, must be aligned to KASAN_GRANULE_SIZE
430 * This function is only available for the generic mode, as it's the only mode
431 * that has partially poisoned memory granules.
433 void kasan_poison_last_granule(const void *address, size_t size);
435 #else /* CONFIG_KASAN_GENERIC */
437 static inline void kasan_poison_last_granule(const void *address, size_t size) { }
439 #endif /* CONFIG_KASAN_GENERIC */
441 #ifndef kasan_arch_is_ready
442 static inline bool kasan_arch_is_ready(void) { return true; }
443 #elif !defined(CONFIG_KASAN_GENERIC) || !defined(CONFIG_KASAN_OUTLINE)
444 #error kasan_arch_is_ready only works in KASAN generic outline mode!
448 * Exported functions for interfaces called from assembly or from generated
449 * code. Declarations here to avoid warning about missing declarations.
451 asmlinkage void kasan_unpoison_task_stack_below(const void *watermark);
452 void __asan_register_globals(struct kasan_global *globals, size_t size);
453 void __asan_unregister_globals(struct kasan_global *globals, size_t size);
454 void __asan_handle_no_return(void);
455 void __asan_alloca_poison(unsigned long addr, size_t size);
456 void __asan_allocas_unpoison(const void *stack_top, const void *stack_bottom);
458 void __asan_load1(unsigned long addr);
459 void __asan_store1(unsigned long addr);
460 void __asan_load2(unsigned long addr);
461 void __asan_store2(unsigned long addr);
462 void __asan_load4(unsigned long addr);
463 void __asan_store4(unsigned long addr);
464 void __asan_load8(unsigned long addr);
465 void __asan_store8(unsigned long addr);
466 void __asan_load16(unsigned long addr);
467 void __asan_store16(unsigned long addr);
468 void __asan_loadN(unsigned long addr, size_t size);
469 void __asan_storeN(unsigned long addr, size_t size);
471 void __asan_load1_noabort(unsigned long addr);
472 void __asan_store1_noabort(unsigned long addr);
473 void __asan_load2_noabort(unsigned long addr);
474 void __asan_store2_noabort(unsigned long addr);
475 void __asan_load4_noabort(unsigned long addr);
476 void __asan_store4_noabort(unsigned long addr);
477 void __asan_load8_noabort(unsigned long addr);
478 void __asan_store8_noabort(unsigned long addr);
479 void __asan_load16_noabort(unsigned long addr);
480 void __asan_store16_noabort(unsigned long addr);
481 void __asan_loadN_noabort(unsigned long addr, size_t size);
482 void __asan_storeN_noabort(unsigned long addr, size_t size);
484 void __asan_report_load1_noabort(unsigned long addr);
485 void __asan_report_store1_noabort(unsigned long addr);
486 void __asan_report_load2_noabort(unsigned long addr);
487 void __asan_report_store2_noabort(unsigned long addr);
488 void __asan_report_load4_noabort(unsigned long addr);
489 void __asan_report_store4_noabort(unsigned long addr);
490 void __asan_report_load8_noabort(unsigned long addr);
491 void __asan_report_store8_noabort(unsigned long addr);
492 void __asan_report_load16_noabort(unsigned long addr);
493 void __asan_report_store16_noabort(unsigned long addr);
494 void __asan_report_load_n_noabort(unsigned long addr, size_t size);
495 void __asan_report_store_n_noabort(unsigned long addr, size_t size);
497 void __asan_set_shadow_00(const void *addr, size_t size);
498 void __asan_set_shadow_f1(const void *addr, size_t size);
499 void __asan_set_shadow_f2(const void *addr, size_t size);
500 void __asan_set_shadow_f3(const void *addr, size_t size);
501 void __asan_set_shadow_f5(const void *addr, size_t size);
502 void __asan_set_shadow_f8(const void *addr, size_t size);
504 void __hwasan_load1_noabort(unsigned long addr);
505 void __hwasan_store1_noabort(unsigned long addr);
506 void __hwasan_load2_noabort(unsigned long addr);
507 void __hwasan_store2_noabort(unsigned long addr);
508 void __hwasan_load4_noabort(unsigned long addr);
509 void __hwasan_store4_noabort(unsigned long addr);
510 void __hwasan_load8_noabort(unsigned long addr);
511 void __hwasan_store8_noabort(unsigned long addr);
512 void __hwasan_load16_noabort(unsigned long addr);
513 void __hwasan_store16_noabort(unsigned long addr);
514 void __hwasan_loadN_noabort(unsigned long addr, size_t size);
515 void __hwasan_storeN_noabort(unsigned long addr, size_t size);
517 void __hwasan_tag_memory(unsigned long addr, u8 tag, unsigned long size);