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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 | /* SPDX-License-Identifier: GPL-2.0 */ #ifndef _LINUX_KASAN_H #define _LINUX_KASAN_H #include <linux/bug.h> #include <linux/kasan-enabled.h> #include <linux/kernel.h> #include <linux/static_key.h> #include <linux/types.h> struct kmem_cache; struct page; struct slab; struct vm_struct; struct task_struct; #ifdef CONFIG_KASAN #include <linux/linkage.h> #include <asm/kasan.h> #endif typedef unsigned int __bitwise kasan_vmalloc_flags_t; #define KASAN_VMALLOC_NONE ((__force kasan_vmalloc_flags_t)0x00u) #define KASAN_VMALLOC_INIT ((__force kasan_vmalloc_flags_t)0x01u) #define KASAN_VMALLOC_VM_ALLOC ((__force kasan_vmalloc_flags_t)0x02u) #define KASAN_VMALLOC_PROT_NORMAL ((__force kasan_vmalloc_flags_t)0x04u) #if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS) #include <linux/pgtable.h> /* Software KASAN implementations use shadow memory. */ #ifdef CONFIG_KASAN_SW_TAGS /* This matches KASAN_TAG_INVALID. */ #define KASAN_SHADOW_INIT 0xFE #else #define KASAN_SHADOW_INIT 0 #endif #ifndef PTE_HWTABLE_PTRS #define PTE_HWTABLE_PTRS 0 #endif extern unsigned char kasan_early_shadow_page[PAGE_SIZE]; extern pte_t kasan_early_shadow_pte[MAX_PTRS_PER_PTE + PTE_HWTABLE_PTRS]; extern pmd_t kasan_early_shadow_pmd[MAX_PTRS_PER_PMD]; extern pud_t kasan_early_shadow_pud[MAX_PTRS_PER_PUD]; extern p4d_t kasan_early_shadow_p4d[MAX_PTRS_PER_P4D]; int kasan_populate_early_shadow(const void *shadow_start, const void *shadow_end); #ifndef kasan_mem_to_shadow static inline void *kasan_mem_to_shadow(const void *addr) { return (void *)((unsigned long)addr >> KASAN_SHADOW_SCALE_SHIFT) + KASAN_SHADOW_OFFSET; } #endif int kasan_add_zero_shadow(void *start, unsigned long size); void kasan_remove_zero_shadow(void *start, unsigned long size); /* Enable reporting bugs after kasan_disable_current() */ extern void kasan_enable_current(void); /* Disable reporting bugs for current task */ extern void kasan_disable_current(void); #else /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */ static inline int kasan_add_zero_shadow(void *start, unsigned long size) { return 0; } static inline void kasan_remove_zero_shadow(void *start, unsigned long size) {} static inline void kasan_enable_current(void) {} static inline void kasan_disable_current(void) {} #endif /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */ #ifdef CONFIG_KASAN_HW_TAGS #else /* CONFIG_KASAN_HW_TAGS */ #endif /* CONFIG_KASAN_HW_TAGS */ static inline bool kasan_has_integrated_init(void) { return kasan_hw_tags_enabled(); } #ifdef CONFIG_KASAN void __kasan_unpoison_range(const void *addr, size_t size); static __always_inline void kasan_unpoison_range(const void *addr, size_t size) { if (kasan_enabled()) __kasan_unpoison_range(addr, size); } void __kasan_poison_pages(struct page *page, unsigned int order, bool init); static __always_inline void kasan_poison_pages(struct page *page, unsigned int order, bool init) { if (kasan_enabled()) __kasan_poison_pages(page, order, init); } bool __kasan_unpoison_pages(struct page *page, unsigned int order, bool init); static __always_inline bool kasan_unpoison_pages(struct page *page, unsigned int order, bool init) { if (kasan_enabled()) return __kasan_unpoison_pages(page, order, init); return false; } void __kasan_poison_slab(struct slab *slab); static __always_inline void kasan_poison_slab(struct slab *slab) { if (kasan_enabled()) __kasan_poison_slab(slab); } void __kasan_unpoison_object_data(struct kmem_cache *cache, void *object); static __always_inline void kasan_unpoison_object_data(struct kmem_cache *cache, void *object) { if (kasan_enabled()) __kasan_unpoison_object_data(cache, object); } void __kasan_poison_object_data(struct kmem_cache *cache, void *object); static __always_inline void kasan_poison_object_data(struct kmem_cache *cache, void *object) { if (kasan_enabled()) __kasan_poison_object_data(cache, object); } void * __must_check __kasan_init_slab_obj(struct kmem_cache *cache, const void *object); static __always_inline void * __must_check kasan_init_slab_obj( struct kmem_cache *cache, const void *object) { if (kasan_enabled()) return __kasan_init_slab_obj(cache, object); return (void *)object; } bool __kasan_slab_free(struct kmem_cache *s, void *object, unsigned long ip, bool init); static __always_inline bool kasan_slab_free(struct kmem_cache *s, void *object, bool init) { if (kasan_enabled()) return __kasan_slab_free(s, object, _RET_IP_, init); return false; } void __kasan_kfree_large(void *ptr, unsigned long ip); static __always_inline void kasan_kfree_large(void *ptr) { if (kasan_enabled()) __kasan_kfree_large(ptr, _RET_IP_); } void __kasan_slab_free_mempool(void *ptr, unsigned long ip); static __always_inline void kasan_slab_free_mempool(void *ptr) { if (kasan_enabled()) __kasan_slab_free_mempool(ptr, _RET_IP_); } void * __must_check __kasan_slab_alloc(struct kmem_cache *s, void *object, gfp_t flags, bool init); static __always_inline void * __must_check kasan_slab_alloc( struct kmem_cache *s, void *object, gfp_t flags, bool init) { if (kasan_enabled()) return __kasan_slab_alloc(s, object, flags, init); return object; } void * __must_check __kasan_kmalloc(struct kmem_cache *s, const void *object, size_t size, gfp_t flags); static __always_inline void * __must_check kasan_kmalloc(struct kmem_cache *s, const void *object, size_t size, gfp_t flags) { if (kasan_enabled()) return __kasan_kmalloc(s, object, size, flags); return (void *)object; } void * __must_check __kasan_kmalloc_large(const void *ptr, size_t size, gfp_t flags); static __always_inline void * __must_check kasan_kmalloc_large(const void *ptr, size_t size, gfp_t flags) { if (kasan_enabled()) return __kasan_kmalloc_large(ptr, size, flags); return (void *)ptr; } void * __must_check __kasan_krealloc(const void *object, size_t new_size, gfp_t flags); static __always_inline void * __must_check kasan_krealloc(const void *object, size_t new_size, gfp_t flags) { if (kasan_enabled()) return __kasan_krealloc(object, new_size, flags); return (void *)object; } /* * Unlike kasan_check_read/write(), kasan_check_byte() is performed even for * the hardware tag-based mode that doesn't rely on compiler instrumentation. */ bool __kasan_check_byte(const void *addr, unsigned long ip); static __always_inline bool kasan_check_byte(const void *addr) { if (kasan_enabled()) return __kasan_check_byte(addr, _RET_IP_); return true; } #else /* CONFIG_KASAN */ static inline void kasan_unpoison_range(const void *address, size_t size) {} static inline void kasan_poison_pages(struct page *page, unsigned int order, bool init) {} static inline bool kasan_unpoison_pages(struct page *page, unsigned int order, bool init) { return false; } static inline void kasan_poison_slab(struct slab *slab) {} static inline void kasan_unpoison_object_data(struct kmem_cache *cache, void *object) {} static inline void kasan_poison_object_data(struct kmem_cache *cache, void *object) {} static inline void *kasan_init_slab_obj(struct kmem_cache *cache, const void *object) { return (void *)object; } static inline bool kasan_slab_free(struct kmem_cache *s, void *object, bool init) { return false; } static inline void kasan_kfree_large(void *ptr) {} static inline void kasan_slab_free_mempool(void *ptr) {} static inline void *kasan_slab_alloc(struct kmem_cache *s, void *object, gfp_t flags, bool init) { return object; } static inline void *kasan_kmalloc(struct kmem_cache *s, const void *object, size_t size, gfp_t flags) { return (void *)object; } static inline void *kasan_kmalloc_large(const void *ptr, size_t size, gfp_t flags) { return (void *)ptr; } static inline void *kasan_krealloc(const void *object, size_t new_size, gfp_t flags) { return (void *)object; } static inline bool kasan_check_byte(const void *address) { return true; } #endif /* CONFIG_KASAN */ #if defined(CONFIG_KASAN) && defined(CONFIG_KASAN_STACK) void kasan_unpoison_task_stack(struct task_struct *task); #else static inline void kasan_unpoison_task_stack(struct task_struct *task) {} #endif #ifdef CONFIG_KASAN_GENERIC struct kasan_cache { int alloc_meta_offset; int free_meta_offset; }; size_t kasan_metadata_size(struct kmem_cache *cache, bool in_object); slab_flags_t kasan_never_merge(void); void kasan_cache_create(struct kmem_cache *cache, unsigned int *size, slab_flags_t *flags); void kasan_cache_shrink(struct kmem_cache *cache); void kasan_cache_shutdown(struct kmem_cache *cache); void kasan_record_aux_stack(void *ptr); void kasan_record_aux_stack_noalloc(void *ptr); #else /* CONFIG_KASAN_GENERIC */ /* Tag-based KASAN modes do not use per-object metadata. */ static inline size_t kasan_metadata_size(struct kmem_cache *cache, bool in_object) { return 0; } /* And thus nothing prevents cache merging. */ static inline slab_flags_t kasan_never_merge(void) { return 0; } /* And no cache-related metadata initialization is required. */ static inline void kasan_cache_create(struct kmem_cache *cache, unsigned int *size, slab_flags_t *flags) {} static inline void kasan_cache_shrink(struct kmem_cache *cache) {} static inline void kasan_cache_shutdown(struct kmem_cache *cache) {} static inline void kasan_record_aux_stack(void *ptr) {} static inline void kasan_record_aux_stack_noalloc(void *ptr) {} #endif /* CONFIG_KASAN_GENERIC */ #if defined(CONFIG_KASAN_SW_TAGS) || defined(CONFIG_KASAN_HW_TAGS) static inline void *kasan_reset_tag(const void *addr) { return (void *)arch_kasan_reset_tag(addr); } /** * kasan_report - print a report about a bad memory access detected by KASAN * @addr: address of the bad access * @size: size of the bad access * @is_write: whether the bad access is a write or a read * @ip: instruction pointer for the accessibility check or the bad access itself */ bool kasan_report(const void *addr, size_t size, bool is_write, unsigned long ip); #else /* CONFIG_KASAN_SW_TAGS || CONFIG_KASAN_HW_TAGS */ static inline void *kasan_reset_tag(const void *addr) { return (void *)addr; } #endif /* CONFIG_KASAN_SW_TAGS || CONFIG_KASAN_HW_TAGS*/ #ifdef CONFIG_KASAN_HW_TAGS void kasan_report_async(void); #endif /* CONFIG_KASAN_HW_TAGS */ #ifdef CONFIG_KASAN_SW_TAGS void __init kasan_init_sw_tags(void); #else static inline void kasan_init_sw_tags(void) { } #endif #ifdef CONFIG_KASAN_HW_TAGS void kasan_init_hw_tags_cpu(void); void __init kasan_init_hw_tags(void); #else static inline void kasan_init_hw_tags_cpu(void) { } static inline void kasan_init_hw_tags(void) { } #endif #ifdef CONFIG_KASAN_VMALLOC #if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS) void kasan_populate_early_vm_area_shadow(void *start, unsigned long size); int kasan_populate_vmalloc(unsigned long addr, unsigned long size); void kasan_release_vmalloc(unsigned long start, unsigned long end, unsigned long free_region_start, unsigned long free_region_end); #else /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */ static inline void kasan_populate_early_vm_area_shadow(void *start, unsigned long size) { } static inline int kasan_populate_vmalloc(unsigned long start, unsigned long size) { return 0; } static inline void kasan_release_vmalloc(unsigned long start, unsigned long end, unsigned long free_region_start, unsigned long free_region_end) { } #endif /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */ void *__kasan_unpoison_vmalloc(const void *start, unsigned long size, kasan_vmalloc_flags_t flags); static __always_inline void *kasan_unpoison_vmalloc(const void *start, unsigned long size, kasan_vmalloc_flags_t flags) { if (kasan_enabled()) return __kasan_unpoison_vmalloc(start, size, flags); return (void *)start; } void __kasan_poison_vmalloc(const void *start, unsigned long size); static __always_inline void kasan_poison_vmalloc(const void *start, unsigned long size) { if (kasan_enabled()) __kasan_poison_vmalloc(start, size); } #else /* CONFIG_KASAN_VMALLOC */ static inline void kasan_populate_early_vm_area_shadow(void *start, unsigned long size) { } static inline int kasan_populate_vmalloc(unsigned long start, unsigned long size) { return 0; } static inline void kasan_release_vmalloc(unsigned long start, unsigned long end, unsigned long free_region_start, unsigned long free_region_end) { } static inline void *kasan_unpoison_vmalloc(const void *start, unsigned long size, kasan_vmalloc_flags_t flags) { return (void *)start; } static inline void kasan_poison_vmalloc(const void *start, unsigned long size) { } #endif /* CONFIG_KASAN_VMALLOC */ #if (defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)) && \ !defined(CONFIG_KASAN_VMALLOC) /* * These functions allocate and free shadow memory for kernel modules. * They are only required when KASAN_VMALLOC is not supported, as otherwise * shadow memory is allocated by the generic vmalloc handlers. */ int kasan_alloc_module_shadow(void *addr, size_t size, gfp_t gfp_mask); void kasan_free_module_shadow(const struct vm_struct *vm); #else /* (CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS) && !CONFIG_KASAN_VMALLOC */ static inline int kasan_alloc_module_shadow(void *addr, size_t size, gfp_t gfp_mask) { return 0; } static inline void kasan_free_module_shadow(const struct vm_struct *vm) {} #endif /* (CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS) && !CONFIG_KASAN_VMALLOC */ #if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS) void kasan_non_canonical_hook(unsigned long addr); #else /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */ static inline void kasan_non_canonical_hook(unsigned long addr) { } #endif /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */ #endif /* LINUX_KASAN_H */ |