1 /* SPDX-License-Identifier: GPL-2.0 */
5 #include <linux/static_key.h>
6 #include <linux/types.h>
15 #include <linux/linkage.h>
16 #include <asm/kasan.h>
18 /* kasan_data struct is used in KUnit tests for KASAN expected failures */
19 struct kunit_kasan_expectation {
25 #if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
27 #include <linux/pgtable.h>
29 /* Software KASAN implementations use shadow memory. */
31 #ifdef CONFIG_KASAN_SW_TAGS
32 /* This matches KASAN_TAG_INVALID. */
33 #define KASAN_SHADOW_INIT 0xFE
35 #define KASAN_SHADOW_INIT 0
38 #ifndef PTE_HWTABLE_PTRS
39 #define PTE_HWTABLE_PTRS 0
42 extern unsigned char kasan_early_shadow_page[PAGE_SIZE];
43 extern pte_t kasan_early_shadow_pte[PTRS_PER_PTE + PTE_HWTABLE_PTRS];
44 extern pmd_t kasan_early_shadow_pmd[PTRS_PER_PMD];
45 extern pud_t kasan_early_shadow_pud[PTRS_PER_PUD];
46 extern p4d_t kasan_early_shadow_p4d[MAX_PTRS_PER_P4D];
48 int kasan_populate_early_shadow(const void *shadow_start,
49 const void *shadow_end);
51 static inline void *kasan_mem_to_shadow(const void *addr)
53 return (void *)((unsigned long)addr >> KASAN_SHADOW_SCALE_SHIFT)
54 + KASAN_SHADOW_OFFSET;
57 int kasan_add_zero_shadow(void *start, unsigned long size);
58 void kasan_remove_zero_shadow(void *start, unsigned long size);
60 /* Enable reporting bugs after kasan_disable_current() */
61 extern void kasan_enable_current(void);
63 /* Disable reporting bugs for current task */
64 extern void kasan_disable_current(void);
66 #else /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */
68 static inline int kasan_add_zero_shadow(void *start, unsigned long size)
72 static inline void kasan_remove_zero_shadow(void *start,
76 static inline void kasan_enable_current(void) {}
77 static inline void kasan_disable_current(void) {}
79 #endif /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */
84 int alloc_meta_offset;
89 #ifdef CONFIG_KASAN_HW_TAGS
91 DECLARE_STATIC_KEY_FALSE(kasan_flag_enabled);
93 static __always_inline bool kasan_enabled(void)
95 return static_branch_likely(&kasan_flag_enabled);
98 static inline bool kasan_has_integrated_init(void)
100 return kasan_enabled();
103 #else /* CONFIG_KASAN_HW_TAGS */
105 static inline bool kasan_enabled(void)
110 static inline bool kasan_has_integrated_init(void)
115 #endif /* CONFIG_KASAN_HW_TAGS */
117 slab_flags_t __kasan_never_merge(void);
118 static __always_inline slab_flags_t kasan_never_merge(void)
121 return __kasan_never_merge();
125 void __kasan_unpoison_range(const void *addr, size_t size);
126 static __always_inline void kasan_unpoison_range(const void *addr, size_t size)
129 __kasan_unpoison_range(addr, size);
132 void __kasan_alloc_pages(struct page *page, unsigned int order, bool init);
133 static __always_inline void kasan_alloc_pages(struct page *page,
134 unsigned int order, bool init)
137 __kasan_alloc_pages(page, order, init);
140 void __kasan_free_pages(struct page *page, unsigned int order, bool init);
141 static __always_inline void kasan_free_pages(struct page *page,
142 unsigned int order, bool init)
145 __kasan_free_pages(page, order, init);
148 void __kasan_cache_create(struct kmem_cache *cache, unsigned int *size,
149 slab_flags_t *flags);
150 static __always_inline void kasan_cache_create(struct kmem_cache *cache,
151 unsigned int *size, slab_flags_t *flags)
154 __kasan_cache_create(cache, size, flags);
157 void __kasan_cache_create_kmalloc(struct kmem_cache *cache);
158 static __always_inline void kasan_cache_create_kmalloc(struct kmem_cache *cache)
161 __kasan_cache_create_kmalloc(cache);
164 size_t __kasan_metadata_size(struct kmem_cache *cache);
165 static __always_inline size_t kasan_metadata_size(struct kmem_cache *cache)
168 return __kasan_metadata_size(cache);
172 void __kasan_poison_slab(struct page *page);
173 static __always_inline void kasan_poison_slab(struct page *page)
176 __kasan_poison_slab(page);
179 void __kasan_unpoison_object_data(struct kmem_cache *cache, void *object);
180 static __always_inline void kasan_unpoison_object_data(struct kmem_cache *cache,
184 __kasan_unpoison_object_data(cache, object);
187 void __kasan_poison_object_data(struct kmem_cache *cache, void *object);
188 static __always_inline void kasan_poison_object_data(struct kmem_cache *cache,
192 __kasan_poison_object_data(cache, object);
195 void * __must_check __kasan_init_slab_obj(struct kmem_cache *cache,
197 static __always_inline void * __must_check kasan_init_slab_obj(
198 struct kmem_cache *cache, const void *object)
201 return __kasan_init_slab_obj(cache, object);
202 return (void *)object;
205 bool __kasan_slab_free(struct kmem_cache *s, void *object,
206 unsigned long ip, bool init);
207 static __always_inline bool kasan_slab_free(struct kmem_cache *s,
208 void *object, bool init)
211 return __kasan_slab_free(s, object, _RET_IP_, init);
215 void __kasan_kfree_large(void *ptr, unsigned long ip);
216 static __always_inline void kasan_kfree_large(void *ptr)
219 __kasan_kfree_large(ptr, _RET_IP_);
222 void __kasan_slab_free_mempool(void *ptr, unsigned long ip);
223 static __always_inline void kasan_slab_free_mempool(void *ptr)
226 __kasan_slab_free_mempool(ptr, _RET_IP_);
229 void * __must_check __kasan_slab_alloc(struct kmem_cache *s,
230 void *object, gfp_t flags, bool init);
231 static __always_inline void * __must_check kasan_slab_alloc(
232 struct kmem_cache *s, void *object, gfp_t flags, bool init)
235 return __kasan_slab_alloc(s, object, flags, init);
239 void * __must_check __kasan_kmalloc(struct kmem_cache *s, const void *object,
240 size_t size, gfp_t flags);
241 static __always_inline void * __must_check kasan_kmalloc(struct kmem_cache *s,
242 const void *object, size_t size, gfp_t flags)
245 return __kasan_kmalloc(s, object, size, flags);
246 return (void *)object;
249 void * __must_check __kasan_kmalloc_large(const void *ptr,
250 size_t size, gfp_t flags);
251 static __always_inline void * __must_check kasan_kmalloc_large(const void *ptr,
252 size_t size, gfp_t flags)
255 return __kasan_kmalloc_large(ptr, size, flags);
259 void * __must_check __kasan_krealloc(const void *object,
260 size_t new_size, gfp_t flags);
261 static __always_inline void * __must_check kasan_krealloc(const void *object,
262 size_t new_size, gfp_t flags)
265 return __kasan_krealloc(object, new_size, flags);
266 return (void *)object;
270 * Unlike kasan_check_read/write(), kasan_check_byte() is performed even for
271 * the hardware tag-based mode that doesn't rely on compiler instrumentation.
273 bool __kasan_check_byte(const void *addr, unsigned long ip);
274 static __always_inline bool kasan_check_byte(const void *addr)
277 return __kasan_check_byte(addr, _RET_IP_);
282 bool kasan_save_enable_multi_shot(void);
283 void kasan_restore_multi_shot(bool enabled);
285 #else /* CONFIG_KASAN */
287 static inline bool kasan_enabled(void)
291 static inline bool kasan_has_integrated_init(void)
295 static inline slab_flags_t kasan_never_merge(void)
299 static inline void kasan_unpoison_range(const void *address, size_t size) {}
300 static inline void kasan_alloc_pages(struct page *page, unsigned int order, bool init) {}
301 static inline void kasan_free_pages(struct page *page, unsigned int order, bool init) {}
302 static inline void kasan_cache_create(struct kmem_cache *cache,
304 slab_flags_t *flags) {}
305 static inline void kasan_cache_create_kmalloc(struct kmem_cache *cache) {}
306 static inline size_t kasan_metadata_size(struct kmem_cache *cache) { return 0; }
307 static inline void kasan_poison_slab(struct page *page) {}
308 static inline void kasan_unpoison_object_data(struct kmem_cache *cache,
310 static inline void kasan_poison_object_data(struct kmem_cache *cache,
312 static inline void *kasan_init_slab_obj(struct kmem_cache *cache,
315 return (void *)object;
317 static inline bool kasan_slab_free(struct kmem_cache *s, void *object, bool init)
321 static inline void kasan_kfree_large(void *ptr) {}
322 static inline void kasan_slab_free_mempool(void *ptr) {}
323 static inline void *kasan_slab_alloc(struct kmem_cache *s, void *object,
324 gfp_t flags, bool init)
328 static inline void *kasan_kmalloc(struct kmem_cache *s, const void *object,
329 size_t size, gfp_t flags)
331 return (void *)object;
333 static inline void *kasan_kmalloc_large(const void *ptr, size_t size, gfp_t flags)
337 static inline void *kasan_krealloc(const void *object, size_t new_size,
340 return (void *)object;
342 static inline bool kasan_check_byte(const void *address)
347 #endif /* CONFIG_KASAN */
349 #if defined(CONFIG_KASAN) && defined(CONFIG_KASAN_STACK)
350 void kasan_unpoison_task_stack(struct task_struct *task);
352 static inline void kasan_unpoison_task_stack(struct task_struct *task) {}
355 #ifdef CONFIG_KASAN_GENERIC
357 void kasan_cache_shrink(struct kmem_cache *cache);
358 void kasan_cache_shutdown(struct kmem_cache *cache);
359 void kasan_record_aux_stack(void *ptr);
361 #else /* CONFIG_KASAN_GENERIC */
363 static inline void kasan_cache_shrink(struct kmem_cache *cache) {}
364 static inline void kasan_cache_shutdown(struct kmem_cache *cache) {}
365 static inline void kasan_record_aux_stack(void *ptr) {}
367 #endif /* CONFIG_KASAN_GENERIC */
369 #if defined(CONFIG_KASAN_SW_TAGS) || defined(CONFIG_KASAN_HW_TAGS)
371 static inline void *kasan_reset_tag(const void *addr)
373 return (void *)arch_kasan_reset_tag(addr);
377 * kasan_report - print a report about a bad memory access detected by KASAN
378 * @addr: address of the bad access
379 * @size: size of the bad access
380 * @is_write: whether the bad access is a write or a read
381 * @ip: instruction pointer for the accessibility check or the bad access itself
383 bool kasan_report(unsigned long addr, size_t size,
384 bool is_write, unsigned long ip);
386 #else /* CONFIG_KASAN_SW_TAGS || CONFIG_KASAN_HW_TAGS */
388 static inline void *kasan_reset_tag(const void *addr)
393 #endif /* CONFIG_KASAN_SW_TAGS || CONFIG_KASAN_HW_TAGS*/
395 #ifdef CONFIG_KASAN_HW_TAGS
397 void kasan_report_async(void);
399 #endif /* CONFIG_KASAN_HW_TAGS */
401 #ifdef CONFIG_KASAN_SW_TAGS
402 void __init kasan_init_sw_tags(void);
404 static inline void kasan_init_sw_tags(void) { }
407 #ifdef CONFIG_KASAN_HW_TAGS
408 void kasan_init_hw_tags_cpu(void);
409 void __init kasan_init_hw_tags(void);
411 static inline void kasan_init_hw_tags_cpu(void) { }
412 static inline void kasan_init_hw_tags(void) { }
415 #ifdef CONFIG_KASAN_VMALLOC
417 int kasan_populate_vmalloc(unsigned long addr, unsigned long size);
418 void kasan_poison_vmalloc(const void *start, unsigned long size);
419 void kasan_unpoison_vmalloc(const void *start, unsigned long size);
420 void kasan_release_vmalloc(unsigned long start, unsigned long end,
421 unsigned long free_region_start,
422 unsigned long free_region_end);
424 #else /* CONFIG_KASAN_VMALLOC */
426 static inline int kasan_populate_vmalloc(unsigned long start,
432 static inline void kasan_poison_vmalloc(const void *start, unsigned long size)
434 static inline void kasan_unpoison_vmalloc(const void *start, unsigned long size)
436 static inline void kasan_release_vmalloc(unsigned long start,
438 unsigned long free_region_start,
439 unsigned long free_region_end) {}
441 #endif /* CONFIG_KASAN_VMALLOC */
443 #if (defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)) && \
444 !defined(CONFIG_KASAN_VMALLOC)
447 * These functions provide a special case to support backing module
448 * allocations with real shadow memory. With KASAN vmalloc, the special
449 * case is unnecessary, as the work is handled in the generic case.
451 int kasan_module_alloc(void *addr, size_t size);
452 void kasan_free_shadow(const struct vm_struct *vm);
454 #else /* (CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS) && !CONFIG_KASAN_VMALLOC */
456 static inline int kasan_module_alloc(void *addr, size_t size) { return 0; }
457 static inline void kasan_free_shadow(const struct vm_struct *vm) {}
459 #endif /* (CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS) && !CONFIG_KASAN_VMALLOC */
461 #ifdef CONFIG_KASAN_INLINE
462 void kasan_non_canonical_hook(unsigned long addr);
463 #else /* CONFIG_KASAN_INLINE */
464 static inline void kasan_non_canonical_hook(unsigned long addr) { }
465 #endif /* CONFIG_KASAN_INLINE */
467 #endif /* LINUX_KASAN_H */