1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
17#define DISABLE_BRANCH_PROFILING
18
19#include <linux/export.h>
20#include <linux/interrupt.h>
21#include <linux/init.h>
22#include <linux/kasan.h>
23#include <linux/kernel.h>
24#include <linux/kmemleak.h>
25#include <linux/linkage.h>
26#include <linux/memblock.h>
27#include <linux/memory.h>
28#include <linux/mm.h>
29#include <linux/module.h>
30#include <linux/printk.h>
31#include <linux/sched.h>
32#include <linux/sched/task_stack.h>
33#include <linux/slab.h>
34#include <linux/stacktrace.h>
35#include <linux/string.h>
36#include <linux/types.h>
37#include <linux/vmalloc.h>
38#include <linux/bug.h>
39
40#include "kasan.h"
41#include "../slab.h"
42
43void kasan_enable_current(void)
44{
45 current->kasan_depth++;
46}
47
48void kasan_disable_current(void)
49{
50 current->kasan_depth--;
51}
52
53
54
55
56
57static void kasan_poison_shadow(const void *address, size_t size, u8 value)
58{
59 void *shadow_start, *shadow_end;
60
61 shadow_start = kasan_mem_to_shadow(address);
62 shadow_end = kasan_mem_to_shadow(address + size);
63
64 memset(shadow_start, value, shadow_end - shadow_start);
65}
66
67void kasan_unpoison_shadow(const void *address, size_t size)
68{
69 kasan_poison_shadow(address, size, 0);
70
71 if (size & KASAN_SHADOW_MASK) {
72 u8 *shadow = (u8 *)kasan_mem_to_shadow(address + size);
73 *shadow = size & KASAN_SHADOW_MASK;
74 }
75}
76
77static void __kasan_unpoison_stack(struct task_struct *task, const void *sp)
78{
79 void *base = task_stack_page(task);
80 size_t size = sp - base;
81
82 kasan_unpoison_shadow(base, size);
83}
84
85
86void kasan_unpoison_task_stack(struct task_struct *task)
87{
88 __kasan_unpoison_stack(task, task_stack_page(task) + THREAD_SIZE);
89}
90
91
92asmlinkage void kasan_unpoison_task_stack_below(const void *watermark)
93{
94
95
96
97
98
99 void *base = (void *)((unsigned long)watermark & ~(THREAD_SIZE - 1));
100
101 kasan_unpoison_shadow(base, watermark - base);
102}
103
104
105
106
107
108
109void kasan_unpoison_stack_above_sp_to(const void *watermark)
110{
111 const void *sp = __builtin_frame_address(0);
112 size_t size = watermark - sp;
113
114 if (WARN_ON(sp > watermark))
115 return;
116 kasan_unpoison_shadow(sp, size);
117}
118
119
120
121
122
123
124
125static __always_inline bool memory_is_poisoned_1(unsigned long addr)
126{
127 s8 shadow_value = *(s8 *)kasan_mem_to_shadow((void *)addr);
128
129 if (unlikely(shadow_value)) {
130 s8 last_accessible_byte = addr & KASAN_SHADOW_MASK;
131 return unlikely(last_accessible_byte >= shadow_value);
132 }
133
134 return false;
135}
136
137static __always_inline bool memory_is_poisoned_2_4_8(unsigned long addr,
138 unsigned long size)
139{
140 u8 *shadow_addr = (u8 *)kasan_mem_to_shadow((void *)addr);
141
142
143
144
145
146 if (unlikely(((addr + size - 1) & KASAN_SHADOW_MASK) < size - 1))
147 return *shadow_addr || memory_is_poisoned_1(addr + size - 1);
148
149 return memory_is_poisoned_1(addr + size - 1);
150}
151
152static __always_inline bool memory_is_poisoned_16(unsigned long addr)
153{
154 u16 *shadow_addr = (u16 *)kasan_mem_to_shadow((void *)addr);
155
156
157 if (unlikely(!IS_ALIGNED(addr, KASAN_SHADOW_SCALE_SIZE)))
158 return *shadow_addr || memory_is_poisoned_1(addr + 15);
159
160 return *shadow_addr;
161}
162
163static __always_inline unsigned long bytes_is_nonzero(const u8 *start,
164 size_t size)
165{
166 while (size) {
167 if (unlikely(*start))
168 return (unsigned long)start;
169 start++;
170 size--;
171 }
172
173 return 0;
174}
175
176static __always_inline unsigned long memory_is_nonzero(const void *start,
177 const void *end)
178{
179 unsigned int words;
180 unsigned long ret;
181 unsigned int prefix = (unsigned long)start % 8;
182
183 if (end - start <= 16)
184 return bytes_is_nonzero(start, end - start);
185
186 if (prefix) {
187 prefix = 8 - prefix;
188 ret = bytes_is_nonzero(start, prefix);
189 if (unlikely(ret))
190 return ret;
191 start += prefix;
192 }
193
194 words = (end - start) / 8;
195 while (words) {
196 if (unlikely(*(u64 *)start))
197 return bytes_is_nonzero(start, 8);
198 start += 8;
199 words--;
200 }
201
202 return bytes_is_nonzero(start, (end - start) % 8);
203}
204
205static __always_inline bool memory_is_poisoned_n(unsigned long addr,
206 size_t size)
207{
208 unsigned long ret;
209
210 ret = memory_is_nonzero(kasan_mem_to_shadow((void *)addr),
211 kasan_mem_to_shadow((void *)addr + size - 1) + 1);
212
213 if (unlikely(ret)) {
214 unsigned long last_byte = addr + size - 1;
215 s8 *last_shadow = (s8 *)kasan_mem_to_shadow((void *)last_byte);
216
217 if (unlikely(ret != (unsigned long)last_shadow ||
218 ((long)(last_byte & KASAN_SHADOW_MASK) >= *last_shadow)))
219 return true;
220 }
221 return false;
222}
223
224static __always_inline bool memory_is_poisoned(unsigned long addr, size_t size)
225{
226 if (__builtin_constant_p(size)) {
227 switch (size) {
228 case 1:
229 return memory_is_poisoned_1(addr);
230 case 2:
231 case 4:
232 case 8:
233 return memory_is_poisoned_2_4_8(addr, size);
234 case 16:
235 return memory_is_poisoned_16(addr);
236 default:
237 BUILD_BUG();
238 }
239 }
240
241 return memory_is_poisoned_n(addr, size);
242}
243
244static __always_inline void check_memory_region_inline(unsigned long addr,
245 size_t size, bool write,
246 unsigned long ret_ip)
247{
248 if (unlikely(size == 0))
249 return;
250
251 if (unlikely((void *)addr <
252 kasan_shadow_to_mem((void *)KASAN_SHADOW_START))) {
253 kasan_report(addr, size, write, ret_ip);
254 return;
255 }
256
257 if (likely(!memory_is_poisoned(addr, size)))
258 return;
259
260 kasan_report(addr, size, write, ret_ip);
261}
262
263static void check_memory_region(unsigned long addr,
264 size_t size, bool write,
265 unsigned long ret_ip)
266{
267 check_memory_region_inline(addr, size, write, ret_ip);
268}
269
270void kasan_check_read(const volatile void *p, unsigned int size)
271{
272 check_memory_region((unsigned long)p, size, false, _RET_IP_);
273}
274EXPORT_SYMBOL(kasan_check_read);
275
276void kasan_check_write(const volatile void *p, unsigned int size)
277{
278 check_memory_region((unsigned long)p, size, true, _RET_IP_);
279}
280EXPORT_SYMBOL(kasan_check_write);
281
282#undef memset
283void *memset(void *addr, int c, size_t len)
284{
285 check_memory_region((unsigned long)addr, len, true, _RET_IP_);
286
287 return __memset(addr, c, len);
288}
289
290#undef memmove
291void *memmove(void *dest, const void *src, size_t len)
292{
293 check_memory_region((unsigned long)src, len, false, _RET_IP_);
294 check_memory_region((unsigned long)dest, len, true, _RET_IP_);
295
296 return __memmove(dest, src, len);
297}
298
299#undef memcpy
300void *memcpy(void *dest, const void *src, size_t len)
301{
302 check_memory_region((unsigned long)src, len, false, _RET_IP_);
303 check_memory_region((unsigned long)dest, len, true, _RET_IP_);
304
305 return __memcpy(dest, src, len);
306}
307
308void kasan_alloc_pages(struct page *page, unsigned int order)
309{
310 if (likely(!PageHighMem(page)))
311 kasan_unpoison_shadow(page_address(page), PAGE_SIZE << order);
312}
313
314void kasan_free_pages(struct page *page, unsigned int order)
315{
316 if (likely(!PageHighMem(page)))
317 kasan_poison_shadow(page_address(page),
318 PAGE_SIZE << order,
319 KASAN_FREE_PAGE);
320}
321
322
323
324
325
326static size_t optimal_redzone(size_t object_size)
327{
328 int rz =
329 object_size <= 64 - 16 ? 16 :
330 object_size <= 128 - 32 ? 32 :
331 object_size <= 512 - 64 ? 64 :
332 object_size <= 4096 - 128 ? 128 :
333 object_size <= (1 << 14) - 256 ? 256 :
334 object_size <= (1 << 15) - 512 ? 512 :
335 object_size <= (1 << 16) - 1024 ? 1024 : 2048;
336 return rz;
337}
338
339void kasan_cache_create(struct kmem_cache *cache, size_t *size,
340 slab_flags_t *flags)
341{
342 int redzone_adjust;
343 int orig_size = *size;
344
345
346 cache->kasan_info.alloc_meta_offset = *size;
347 *size += sizeof(struct kasan_alloc_meta);
348
349
350 if (cache->flags & SLAB_TYPESAFE_BY_RCU || cache->ctor ||
351 cache->object_size < sizeof(struct kasan_free_meta)) {
352 cache->kasan_info.free_meta_offset = *size;
353 *size += sizeof(struct kasan_free_meta);
354 }
355 redzone_adjust = optimal_redzone(cache->object_size) -
356 (*size - cache->object_size);
357
358 if (redzone_adjust > 0)
359 *size += redzone_adjust;
360
361 *size = min(KMALLOC_MAX_SIZE, max(*size, cache->object_size +
362 optimal_redzone(cache->object_size)));
363
364
365
366
367 if (*size <= cache->kasan_info.alloc_meta_offset ||
368 *size <= cache->kasan_info.free_meta_offset) {
369 cache->kasan_info.alloc_meta_offset = 0;
370 cache->kasan_info.free_meta_offset = 0;
371 *size = orig_size;
372 return;
373 }
374
375 *flags |= SLAB_KASAN;
376}
377
378void kasan_cache_shrink(struct kmem_cache *cache)
379{
380 quarantine_remove_cache(cache);
381}
382
383void kasan_cache_shutdown(struct kmem_cache *cache)
384{
385 quarantine_remove_cache(cache);
386}
387
388size_t kasan_metadata_size(struct kmem_cache *cache)
389{
390 return (cache->kasan_info.alloc_meta_offset ?
391 sizeof(struct kasan_alloc_meta) : 0) +
392 (cache->kasan_info.free_meta_offset ?
393 sizeof(struct kasan_free_meta) : 0);
394}
395
396void kasan_poison_slab(struct page *page)
397{
398 kasan_poison_shadow(page_address(page),
399 PAGE_SIZE << compound_order(page),
400 KASAN_KMALLOC_REDZONE);
401}
402
403void kasan_unpoison_object_data(struct kmem_cache *cache, void *object)
404{
405 kasan_unpoison_shadow(object, cache->object_size);
406}
407
408void kasan_poison_object_data(struct kmem_cache *cache, void *object)
409{
410 kasan_poison_shadow(object,
411 round_up(cache->object_size, KASAN_SHADOW_SCALE_SIZE),
412 KASAN_KMALLOC_REDZONE);
413}
414
415static inline int in_irqentry_text(unsigned long ptr)
416{
417 return (ptr >= (unsigned long)&__irqentry_text_start &&
418 ptr < (unsigned long)&__irqentry_text_end) ||
419 (ptr >= (unsigned long)&__softirqentry_text_start &&
420 ptr < (unsigned long)&__softirqentry_text_end);
421}
422
423static inline void filter_irq_stacks(struct stack_trace *trace)
424{
425 int i;
426
427 if (!trace->nr_entries)
428 return;
429 for (i = 0; i < trace->nr_entries; i++)
430 if (in_irqentry_text(trace->entries[i])) {
431
432 trace->nr_entries = i + 1;
433 break;
434 }
435}
436
437static inline depot_stack_handle_t save_stack(gfp_t flags)
438{
439 unsigned long entries[KASAN_STACK_DEPTH];
440 struct stack_trace trace = {
441 .nr_entries = 0,
442 .entries = entries,
443 .max_entries = KASAN_STACK_DEPTH,
444 .skip = 0
445 };
446
447 save_stack_trace(&trace);
448 filter_irq_stacks(&trace);
449 if (trace.nr_entries != 0 &&
450 trace.entries[trace.nr_entries-1] == ULONG_MAX)
451 trace.nr_entries--;
452
453 return depot_save_stack(&trace, flags);
454}
455
456static inline void set_track(struct kasan_track *track, gfp_t flags)
457{
458 track->pid = current->pid;
459 track->stack = save_stack(flags);
460}
461
462struct kasan_alloc_meta *get_alloc_info(struct kmem_cache *cache,
463 const void *object)
464{
465 BUILD_BUG_ON(sizeof(struct kasan_alloc_meta) > 32);
466 return (void *)object + cache->kasan_info.alloc_meta_offset;
467}
468
469struct kasan_free_meta *get_free_info(struct kmem_cache *cache,
470 const void *object)
471{
472 BUILD_BUG_ON(sizeof(struct kasan_free_meta) > 32);
473 return (void *)object + cache->kasan_info.free_meta_offset;
474}
475
476void kasan_init_slab_obj(struct kmem_cache *cache, const void *object)
477{
478 struct kasan_alloc_meta *alloc_info;
479
480 if (!(cache->flags & SLAB_KASAN))
481 return;
482
483 alloc_info = get_alloc_info(cache, object);
484 __memset(alloc_info, 0, sizeof(*alloc_info));
485}
486
487void kasan_slab_alloc(struct kmem_cache *cache, void *object, gfp_t flags)
488{
489 kasan_kmalloc(cache, object, cache->object_size, flags);
490}
491
492static bool __kasan_slab_free(struct kmem_cache *cache, void *object,
493 unsigned long ip, bool quarantine)
494{
495 s8 shadow_byte;
496 unsigned long rounded_up_size;
497
498 if (unlikely(nearest_obj(cache, virt_to_head_page(object), object) !=
499 object)) {
500 kasan_report_invalid_free(object, ip);
501 return true;
502 }
503
504
505 if (unlikely(cache->flags & SLAB_TYPESAFE_BY_RCU))
506 return false;
507
508 shadow_byte = READ_ONCE(*(s8 *)kasan_mem_to_shadow(object));
509 if (shadow_byte < 0 || shadow_byte >= KASAN_SHADOW_SCALE_SIZE) {
510 kasan_report_invalid_free(object, ip);
511 return true;
512 }
513
514 rounded_up_size = round_up(cache->object_size, KASAN_SHADOW_SCALE_SIZE);
515 kasan_poison_shadow(object, rounded_up_size, KASAN_KMALLOC_FREE);
516
517 if (!quarantine || unlikely(!(cache->flags & SLAB_KASAN)))
518 return false;
519
520 set_track(&get_alloc_info(cache, object)->free_track, GFP_NOWAIT);
521 quarantine_put(get_free_info(cache, object), cache);
522 return true;
523}
524
525bool kasan_slab_free(struct kmem_cache *cache, void *object, unsigned long ip)
526{
527 return __kasan_slab_free(cache, object, ip, true);
528}
529
530void kasan_kmalloc(struct kmem_cache *cache, const void *object, size_t size,
531 gfp_t flags)
532{
533 unsigned long redzone_start;
534 unsigned long redzone_end;
535
536 if (gfpflags_allow_blocking(flags))
537 quarantine_reduce();
538
539 if (unlikely(object == NULL))
540 return;
541
542 redzone_start = round_up((unsigned long)(object + size),
543 KASAN_SHADOW_SCALE_SIZE);
544 redzone_end = round_up((unsigned long)object + cache->object_size,
545 KASAN_SHADOW_SCALE_SIZE);
546
547 kasan_unpoison_shadow(object, size);
548 kasan_poison_shadow((void *)redzone_start, redzone_end - redzone_start,
549 KASAN_KMALLOC_REDZONE);
550
551 if (cache->flags & SLAB_KASAN)
552 set_track(&get_alloc_info(cache, object)->alloc_track, flags);
553}
554EXPORT_SYMBOL(kasan_kmalloc);
555
556void kasan_kmalloc_large(const void *ptr, size_t size, gfp_t flags)
557{
558 struct page *page;
559 unsigned long redzone_start;
560 unsigned long redzone_end;
561
562 if (gfpflags_allow_blocking(flags))
563 quarantine_reduce();
564
565 if (unlikely(ptr == NULL))
566 return;
567
568 page = virt_to_page(ptr);
569 redzone_start = round_up((unsigned long)(ptr + size),
570 KASAN_SHADOW_SCALE_SIZE);
571 redzone_end = (unsigned long)ptr + (PAGE_SIZE << compound_order(page));
572
573 kasan_unpoison_shadow(ptr, size);
574 kasan_poison_shadow((void *)redzone_start, redzone_end - redzone_start,
575 KASAN_PAGE_REDZONE);
576}
577
578void kasan_krealloc(const void *object, size_t size, gfp_t flags)
579{
580 struct page *page;
581
582 if (unlikely(object == ZERO_SIZE_PTR))
583 return;
584
585 page = virt_to_head_page(object);
586
587 if (unlikely(!PageSlab(page)))
588 kasan_kmalloc_large(object, size, flags);
589 else
590 kasan_kmalloc(page->slab_cache, object, size, flags);
591}
592
593void kasan_poison_kfree(void *ptr, unsigned long ip)
594{
595 struct page *page;
596
597 page = virt_to_head_page(ptr);
598
599 if (unlikely(!PageSlab(page))) {
600 if (ptr != page_address(page)) {
601 kasan_report_invalid_free(ptr, ip);
602 return;
603 }
604 kasan_poison_shadow(ptr, PAGE_SIZE << compound_order(page),
605 KASAN_FREE_PAGE);
606 } else {
607 __kasan_slab_free(page->slab_cache, ptr, ip, false);
608 }
609}
610
611void kasan_kfree_large(void *ptr, unsigned long ip)
612{
613 if (ptr != page_address(virt_to_head_page(ptr)))
614 kasan_report_invalid_free(ptr, ip);
615
616}
617
618int kasan_module_alloc(void *addr, size_t size)
619{
620 void *ret;
621 size_t shadow_size;
622 unsigned long shadow_start;
623
624 shadow_start = (unsigned long)kasan_mem_to_shadow(addr);
625 shadow_size = round_up(size >> KASAN_SHADOW_SCALE_SHIFT,
626 PAGE_SIZE);
627
628 if (WARN_ON(!PAGE_ALIGNED(shadow_start)))
629 return -EINVAL;
630
631 ret = __vmalloc_node_range(shadow_size, 1, shadow_start,
632 shadow_start + shadow_size,
633 GFP_KERNEL | __GFP_ZERO,
634 PAGE_KERNEL, VM_NO_GUARD, NUMA_NO_NODE,
635 __builtin_return_address(0));
636
637 if (ret) {
638 find_vm_area(addr)->flags |= VM_KASAN;
639 kmemleak_ignore(ret);
640 return 0;
641 }
642
643 return -ENOMEM;
644}
645
646void kasan_free_shadow(const struct vm_struct *vm)
647{
648 if (vm->flags & VM_KASAN)
649 vfree(kasan_mem_to_shadow(vm->addr));
650}
651
652static void register_global(struct kasan_global *global)
653{
654 size_t aligned_size = round_up(global->size, KASAN_SHADOW_SCALE_SIZE);
655
656 kasan_unpoison_shadow(global->beg, global->size);
657
658 kasan_poison_shadow(global->beg + aligned_size,
659 global->size_with_redzone - aligned_size,
660 KASAN_GLOBAL_REDZONE);
661}
662
663void __asan_register_globals(struct kasan_global *globals, size_t size)
664{
665 int i;
666
667 for (i = 0; i < size; i++)
668 register_global(&globals[i]);
669}
670EXPORT_SYMBOL(__asan_register_globals);
671
672void __asan_unregister_globals(struct kasan_global *globals, size_t size)
673{
674}
675EXPORT_SYMBOL(__asan_unregister_globals);
676
677#define DEFINE_ASAN_LOAD_STORE(size) \
678 void __asan_load##size(unsigned long addr) \
679 { \
680 check_memory_region_inline(addr, size, false, _RET_IP_);\
681 } \
682 EXPORT_SYMBOL(__asan_load##size); \
683 __alias(__asan_load##size) \
684 void __asan_load##size##_noabort(unsigned long); \
685 EXPORT_SYMBOL(__asan_load##size##_noabort); \
686 void __asan_store##size(unsigned long addr) \
687 { \
688 check_memory_region_inline(addr, size, true, _RET_IP_); \
689 } \
690 EXPORT_SYMBOL(__asan_store##size); \
691 __alias(__asan_store##size) \
692 void __asan_store##size##_noabort(unsigned long); \
693 EXPORT_SYMBOL(__asan_store##size##_noabort)
694
695DEFINE_ASAN_LOAD_STORE(1);
696DEFINE_ASAN_LOAD_STORE(2);
697DEFINE_ASAN_LOAD_STORE(4);
698DEFINE_ASAN_LOAD_STORE(8);
699DEFINE_ASAN_LOAD_STORE(16);
700
701void __asan_loadN(unsigned long addr, size_t size)
702{
703 check_memory_region(addr, size, false, _RET_IP_);
704}
705EXPORT_SYMBOL(__asan_loadN);
706
707__alias(__asan_loadN)
708void __asan_loadN_noabort(unsigned long, size_t);
709EXPORT_SYMBOL(__asan_loadN_noabort);
710
711void __asan_storeN(unsigned long addr, size_t size)
712{
713 check_memory_region(addr, size, true, _RET_IP_);
714}
715EXPORT_SYMBOL(__asan_storeN);
716
717__alias(__asan_storeN)
718void __asan_storeN_noabort(unsigned long, size_t);
719EXPORT_SYMBOL(__asan_storeN_noabort);
720
721
722void __asan_handle_no_return(void) {}
723EXPORT_SYMBOL(__asan_handle_no_return);
724
725
726void __asan_poison_stack_memory(const void *addr, size_t size)
727{
728
729
730
731
732 kasan_poison_shadow(addr, round_up(size, KASAN_SHADOW_SCALE_SIZE),
733 KASAN_USE_AFTER_SCOPE);
734}
735EXPORT_SYMBOL(__asan_poison_stack_memory);
736
737
738void __asan_unpoison_stack_memory(const void *addr, size_t size)
739{
740 kasan_unpoison_shadow(addr, size);
741}
742EXPORT_SYMBOL(__asan_unpoison_stack_memory);
743
744
745void __asan_alloca_poison(unsigned long addr, size_t size)
746{
747 size_t rounded_up_size = round_up(size, KASAN_SHADOW_SCALE_SIZE);
748 size_t padding_size = round_up(size, KASAN_ALLOCA_REDZONE_SIZE) -
749 rounded_up_size;
750 size_t rounded_down_size = round_down(size, KASAN_SHADOW_SCALE_SIZE);
751
752 const void *left_redzone = (const void *)(addr -
753 KASAN_ALLOCA_REDZONE_SIZE);
754 const void *right_redzone = (const void *)(addr + rounded_up_size);
755
756 WARN_ON(!IS_ALIGNED(addr, KASAN_ALLOCA_REDZONE_SIZE));
757
758 kasan_unpoison_shadow((const void *)(addr + rounded_down_size),
759 size - rounded_down_size);
760 kasan_poison_shadow(left_redzone, KASAN_ALLOCA_REDZONE_SIZE,
761 KASAN_ALLOCA_LEFT);
762 kasan_poison_shadow(right_redzone,
763 padding_size + KASAN_ALLOCA_REDZONE_SIZE,
764 KASAN_ALLOCA_RIGHT);
765}
766EXPORT_SYMBOL(__asan_alloca_poison);
767
768
769void __asan_allocas_unpoison(const void *stack_top, const void *stack_bottom)
770{
771 if (unlikely(!stack_top || stack_top > stack_bottom))
772 return;
773
774 kasan_unpoison_shadow(stack_top, stack_bottom - stack_top);
775}
776EXPORT_SYMBOL(__asan_allocas_unpoison);
777
778
779#define DEFINE_ASAN_SET_SHADOW(byte) \
780 void __asan_set_shadow_##byte(const void *addr, size_t size) \
781 { \
782 __memset((void *)addr, 0x##byte, size); \
783 } \
784 EXPORT_SYMBOL(__asan_set_shadow_##byte)
785
786DEFINE_ASAN_SET_SHADOW(00);
787DEFINE_ASAN_SET_SHADOW(f1);
788DEFINE_ASAN_SET_SHADOW(f2);
789DEFINE_ASAN_SET_SHADOW(f3);
790DEFINE_ASAN_SET_SHADOW(f5);
791DEFINE_ASAN_SET_SHADOW(f8);
792
793#ifdef CONFIG_MEMORY_HOTPLUG
794static int __meminit kasan_mem_notifier(struct notifier_block *nb,
795 unsigned long action, void *data)
796{
797 struct memory_notify *mem_data = data;
798 unsigned long nr_shadow_pages, start_kaddr, shadow_start;
799 unsigned long shadow_end, shadow_size;
800
801 nr_shadow_pages = mem_data->nr_pages >> KASAN_SHADOW_SCALE_SHIFT;
802 start_kaddr = (unsigned long)pfn_to_kaddr(mem_data->start_pfn);
803 shadow_start = (unsigned long)kasan_mem_to_shadow((void *)start_kaddr);
804 shadow_size = nr_shadow_pages << PAGE_SHIFT;
805 shadow_end = shadow_start + shadow_size;
806
807 if (WARN_ON(mem_data->nr_pages % KASAN_SHADOW_SCALE_SIZE) ||
808 WARN_ON(start_kaddr % (KASAN_SHADOW_SCALE_SIZE << PAGE_SHIFT)))
809 return NOTIFY_BAD;
810
811 switch (action) {
812 case MEM_GOING_ONLINE: {
813 void *ret;
814
815 ret = __vmalloc_node_range(shadow_size, PAGE_SIZE, shadow_start,
816 shadow_end, GFP_KERNEL,
817 PAGE_KERNEL, VM_NO_GUARD,
818 pfn_to_nid(mem_data->start_pfn),
819 __builtin_return_address(0));
820 if (!ret)
821 return NOTIFY_BAD;
822
823 kmemleak_ignore(ret);
824 return NOTIFY_OK;
825 }
826 case MEM_OFFLINE:
827 vfree((void *)shadow_start);
828 }
829
830 return NOTIFY_OK;
831}
832
833static int __init kasan_memhotplug_init(void)
834{
835 hotplug_memory_notifier(kasan_mem_notifier, 0);
836
837 return 0;
838}
839
840module_init(kasan_memhotplug_init);
841#endif
842