1 /* SPDX-License-Identifier: GPL-2.0 */
6 #include <linux/kasan-enabled.h>
7 #include <linux/kernel.h>
8 #include <linux/static_key.h>
9 #include <linux/types.h>
19 #include <linux/linkage.h>
20 #include <asm/kasan.h>
22 /* kasan_data struct is used in KUnit tests for KASAN expected failures */
23 struct kunit_kasan_expectation {
29 #if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
31 #include <linux/pgtable.h>
33 /* Software KASAN implementations use shadow memory. */
35 #ifdef CONFIG_KASAN_SW_TAGS
36 /* This matches KASAN_TAG_INVALID. */
37 #define KASAN_SHADOW_INIT 0xFE
39 #define KASAN_SHADOW_INIT 0
42 #ifndef PTE_HWTABLE_PTRS
43 #define PTE_HWTABLE_PTRS 0
46 extern unsigned char kasan_early_shadow_page[PAGE_SIZE];
47 extern pte_t kasan_early_shadow_pte[MAX_PTRS_PER_PTE + PTE_HWTABLE_PTRS];
48 extern pmd_t kasan_early_shadow_pmd[MAX_PTRS_PER_PMD];
49 extern pud_t kasan_early_shadow_pud[MAX_PTRS_PER_PUD];
50 extern p4d_t kasan_early_shadow_p4d[MAX_PTRS_PER_P4D];
52 int kasan_populate_early_shadow(const void *shadow_start,
53 const void *shadow_end);
55 static inline void *kasan_mem_to_shadow(const void *addr)
57 return (void *)((unsigned long)addr >> KASAN_SHADOW_SCALE_SHIFT)
58 + KASAN_SHADOW_OFFSET;
61 int kasan_add_zero_shadow(void *start, unsigned long size);
62 void kasan_remove_zero_shadow(void *start, unsigned long size);
64 /* Enable reporting bugs after kasan_disable_current() */
65 extern void kasan_enable_current(void);
67 /* Disable reporting bugs for current task */
68 extern void kasan_disable_current(void);
70 #else /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */
72 static inline int kasan_add_zero_shadow(void *start, unsigned long size)
76 static inline void kasan_remove_zero_shadow(void *start,
80 static inline void kasan_enable_current(void) {}
81 static inline void kasan_disable_current(void) {}
83 #endif /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */
85 #ifdef CONFIG_KASAN_HW_TAGS
87 void kasan_alloc_pages(struct page *page, unsigned int order, gfp_t flags);
89 #else /* CONFIG_KASAN_HW_TAGS */
91 static __always_inline void kasan_alloc_pages(struct page *page,
92 unsigned int order, gfp_t flags)
94 /* Only available for integrated init. */
98 #endif /* CONFIG_KASAN_HW_TAGS */
100 static inline bool kasan_has_integrated_init(void)
102 return kasan_hw_tags_enabled();
108 int alloc_meta_offset;
109 int free_meta_offset;
113 slab_flags_t __kasan_never_merge(void);
114 static __always_inline slab_flags_t kasan_never_merge(void)
117 return __kasan_never_merge();
121 void __kasan_unpoison_range(const void *addr, size_t size);
122 static __always_inline void kasan_unpoison_range(const void *addr, size_t size)
125 __kasan_unpoison_range(addr, size);
128 void __kasan_poison_pages(struct page *page, unsigned int order, bool init);
129 static __always_inline void kasan_poison_pages(struct page *page,
130 unsigned int order, bool init)
133 __kasan_poison_pages(page, order, init);
136 void __kasan_unpoison_pages(struct page *page, unsigned int order, bool init);
137 static __always_inline void kasan_unpoison_pages(struct page *page,
138 unsigned int order, bool init)
141 __kasan_unpoison_pages(page, order, init);
144 void __kasan_cache_create(struct kmem_cache *cache, unsigned int *size,
145 slab_flags_t *flags);
146 static __always_inline void kasan_cache_create(struct kmem_cache *cache,
147 unsigned int *size, slab_flags_t *flags)
150 __kasan_cache_create(cache, size, flags);
153 void __kasan_cache_create_kmalloc(struct kmem_cache *cache);
154 static __always_inline void kasan_cache_create_kmalloc(struct kmem_cache *cache)
157 __kasan_cache_create_kmalloc(cache);
160 size_t __kasan_metadata_size(struct kmem_cache *cache);
161 static __always_inline size_t kasan_metadata_size(struct kmem_cache *cache)
164 return __kasan_metadata_size(cache);
168 void __kasan_poison_slab(struct slab *slab);
169 static __always_inline void kasan_poison_slab(struct slab *slab)
172 __kasan_poison_slab(slab);
175 void __kasan_unpoison_object_data(struct kmem_cache *cache, void *object);
176 static __always_inline void kasan_unpoison_object_data(struct kmem_cache *cache,
180 __kasan_unpoison_object_data(cache, object);
183 void __kasan_poison_object_data(struct kmem_cache *cache, void *object);
184 static __always_inline void kasan_poison_object_data(struct kmem_cache *cache,
188 __kasan_poison_object_data(cache, object);
191 void * __must_check __kasan_init_slab_obj(struct kmem_cache *cache,
193 static __always_inline void * __must_check kasan_init_slab_obj(
194 struct kmem_cache *cache, const void *object)
197 return __kasan_init_slab_obj(cache, object);
198 return (void *)object;
201 bool __kasan_slab_free(struct kmem_cache *s, void *object,
202 unsigned long ip, bool init);
203 static __always_inline bool kasan_slab_free(struct kmem_cache *s,
204 void *object, bool init)
207 return __kasan_slab_free(s, object, _RET_IP_, init);
211 void __kasan_kfree_large(void *ptr, unsigned long ip);
212 static __always_inline void kasan_kfree_large(void *ptr)
215 __kasan_kfree_large(ptr, _RET_IP_);
218 void __kasan_slab_free_mempool(void *ptr, unsigned long ip);
219 static __always_inline void kasan_slab_free_mempool(void *ptr)
222 __kasan_slab_free_mempool(ptr, _RET_IP_);
225 void * __must_check __kasan_slab_alloc(struct kmem_cache *s,
226 void *object, gfp_t flags, bool init);
227 static __always_inline void * __must_check kasan_slab_alloc(
228 struct kmem_cache *s, void *object, gfp_t flags, bool init)
231 return __kasan_slab_alloc(s, object, flags, init);
235 void * __must_check __kasan_kmalloc(struct kmem_cache *s, const void *object,
236 size_t size, gfp_t flags);
237 static __always_inline void * __must_check kasan_kmalloc(struct kmem_cache *s,
238 const void *object, size_t size, gfp_t flags)
241 return __kasan_kmalloc(s, object, size, flags);
242 return (void *)object;
245 void * __must_check __kasan_kmalloc_large(const void *ptr,
246 size_t size, gfp_t flags);
247 static __always_inline void * __must_check kasan_kmalloc_large(const void *ptr,
248 size_t size, gfp_t flags)
251 return __kasan_kmalloc_large(ptr, size, flags);
255 void * __must_check __kasan_krealloc(const void *object,
256 size_t new_size, gfp_t flags);
257 static __always_inline void * __must_check kasan_krealloc(const void *object,
258 size_t new_size, gfp_t flags)
261 return __kasan_krealloc(object, new_size, flags);
262 return (void *)object;
266 * Unlike kasan_check_read/write(), kasan_check_byte() is performed even for
267 * the hardware tag-based mode that doesn't rely on compiler instrumentation.
269 bool __kasan_check_byte(const void *addr, unsigned long ip);
270 static __always_inline bool kasan_check_byte(const void *addr)
273 return __kasan_check_byte(addr, _RET_IP_);
278 bool kasan_save_enable_multi_shot(void);
279 void kasan_restore_multi_shot(bool enabled);
281 #else /* CONFIG_KASAN */
283 static inline slab_flags_t kasan_never_merge(void)
287 static inline void kasan_unpoison_range(const void *address, size_t size) {}
288 static inline void kasan_poison_pages(struct page *page, unsigned int order,
290 static inline void kasan_unpoison_pages(struct page *page, unsigned int order,
292 static inline void kasan_cache_create(struct kmem_cache *cache,
294 slab_flags_t *flags) {}
295 static inline void kasan_cache_create_kmalloc(struct kmem_cache *cache) {}
296 static inline size_t kasan_metadata_size(struct kmem_cache *cache) { return 0; }
297 static inline void kasan_poison_slab(struct slab *slab) {}
298 static inline void kasan_unpoison_object_data(struct kmem_cache *cache,
300 static inline void kasan_poison_object_data(struct kmem_cache *cache,
302 static inline void *kasan_init_slab_obj(struct kmem_cache *cache,
305 return (void *)object;
307 static inline bool kasan_slab_free(struct kmem_cache *s, void *object, bool init)
311 static inline void kasan_kfree_large(void *ptr) {}
312 static inline void kasan_slab_free_mempool(void *ptr) {}
313 static inline void *kasan_slab_alloc(struct kmem_cache *s, void *object,
314 gfp_t flags, bool init)
318 static inline void *kasan_kmalloc(struct kmem_cache *s, const void *object,
319 size_t size, gfp_t flags)
321 return (void *)object;
323 static inline void *kasan_kmalloc_large(const void *ptr, size_t size, gfp_t flags)
327 static inline void *kasan_krealloc(const void *object, size_t new_size,
330 return (void *)object;
332 static inline bool kasan_check_byte(const void *address)
337 #endif /* CONFIG_KASAN */
339 #if defined(CONFIG_KASAN) && defined(CONFIG_KASAN_STACK)
340 void kasan_unpoison_task_stack(struct task_struct *task);
342 static inline void kasan_unpoison_task_stack(struct task_struct *task) {}
345 #ifdef CONFIG_KASAN_GENERIC
347 void kasan_cache_shrink(struct kmem_cache *cache);
348 void kasan_cache_shutdown(struct kmem_cache *cache);
349 void kasan_record_aux_stack(void *ptr);
350 void kasan_record_aux_stack_noalloc(void *ptr);
352 #else /* CONFIG_KASAN_GENERIC */
354 static inline void kasan_cache_shrink(struct kmem_cache *cache) {}
355 static inline void kasan_cache_shutdown(struct kmem_cache *cache) {}
356 static inline void kasan_record_aux_stack(void *ptr) {}
357 static inline void kasan_record_aux_stack_noalloc(void *ptr) {}
359 #endif /* CONFIG_KASAN_GENERIC */
361 #if defined(CONFIG_KASAN_SW_TAGS) || defined(CONFIG_KASAN_HW_TAGS)
363 static inline void *kasan_reset_tag(const void *addr)
365 return (void *)arch_kasan_reset_tag(addr);
369 * kasan_report - print a report about a bad memory access detected by KASAN
370 * @addr: address of the bad access
371 * @size: size of the bad access
372 * @is_write: whether the bad access is a write or a read
373 * @ip: instruction pointer for the accessibility check or the bad access itself
375 bool kasan_report(unsigned long addr, size_t size,
376 bool is_write, unsigned long ip);
378 #else /* CONFIG_KASAN_SW_TAGS || CONFIG_KASAN_HW_TAGS */
380 static inline void *kasan_reset_tag(const void *addr)
385 #endif /* CONFIG_KASAN_SW_TAGS || CONFIG_KASAN_HW_TAGS*/
387 #ifdef CONFIG_KASAN_HW_TAGS
389 void kasan_report_async(void);
391 #endif /* CONFIG_KASAN_HW_TAGS */
393 #ifdef CONFIG_KASAN_SW_TAGS
394 void __init kasan_init_sw_tags(void);
396 static inline void kasan_init_sw_tags(void) { }
399 #ifdef CONFIG_KASAN_HW_TAGS
400 void kasan_init_hw_tags_cpu(void);
401 void __init kasan_init_hw_tags(void);
403 static inline void kasan_init_hw_tags_cpu(void) { }
404 static inline void kasan_init_hw_tags(void) { }
407 #ifdef CONFIG_KASAN_VMALLOC
409 int kasan_populate_vmalloc(unsigned long addr, unsigned long size);
410 void kasan_poison_vmalloc(const void *start, unsigned long size);
411 void kasan_unpoison_vmalloc(const void *start, unsigned long size);
412 void kasan_release_vmalloc(unsigned long start, unsigned long end,
413 unsigned long free_region_start,
414 unsigned long free_region_end);
416 void kasan_populate_early_vm_area_shadow(void *start, unsigned long size);
418 #else /* CONFIG_KASAN_VMALLOC */
420 static inline int kasan_populate_vmalloc(unsigned long start,
426 static inline void kasan_poison_vmalloc(const void *start, unsigned long size)
428 static inline void kasan_unpoison_vmalloc(const void *start, unsigned long size)
430 static inline void kasan_release_vmalloc(unsigned long start,
432 unsigned long free_region_start,
433 unsigned long free_region_end) {}
435 static inline void kasan_populate_early_vm_area_shadow(void *start,
439 #endif /* CONFIG_KASAN_VMALLOC */
441 #if (defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)) && \
442 !defined(CONFIG_KASAN_VMALLOC)
445 * These functions provide a special case to support backing module
446 * allocations with real shadow memory. With KASAN vmalloc, the special
447 * case is unnecessary, as the work is handled in the generic case.
449 int kasan_module_alloc(void *addr, size_t size, gfp_t gfp_mask);
450 void kasan_free_shadow(const struct vm_struct *vm);
452 #else /* (CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS) && !CONFIG_KASAN_VMALLOC */
454 static inline int kasan_module_alloc(void *addr, size_t size, gfp_t gfp_mask) { return 0; }
455 static inline void kasan_free_shadow(const struct vm_struct *vm) {}
457 #endif /* (CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS) && !CONFIG_KASAN_VMALLOC */
459 #ifdef CONFIG_KASAN_INLINE
460 void kasan_non_canonical_hook(unsigned long addr);
461 #else /* CONFIG_KASAN_INLINE */
462 static inline void kasan_non_canonical_hook(unsigned long addr) { }
463 #endif /* CONFIG_KASAN_INLINE */
465 #endif /* LINUX_KASAN_H */