diff options
Diffstat (limited to 'mm/kasan/common.c')
| -rw-r--r-- | mm/kasan/common.c | 49 |
1 files changed, 27 insertions, 22 deletions
diff --git a/mm/kasan/common.c b/mm/kasan/common.c index 89e5ef9417a7..73e79a34671b 100644 --- a/mm/kasan/common.c +++ b/mm/kasan/common.c @@ -108,7 +108,7 @@ void *memcpy(void *dest, const void *src, size_t len) * Poisons the shadow memory for 'size' bytes starting from 'addr'. * Memory addresses should be aligned to KASAN_SHADOW_SCALE_SIZE. */ -void kasan_poison_shadow(const void *address, size_t size, u8 value) +void poison_range(const void *address, size_t size, u8 value) { void *shadow_start, *shadow_end; @@ -125,7 +125,7 @@ void kasan_poison_shadow(const void *address, size_t size, u8 value) __memset(shadow_start, value, shadow_end - shadow_start); } -void kasan_unpoison_shadow(const void *address, size_t size) +void unpoison_range(const void *address, size_t size) { u8 tag = get_tag(address); @@ -136,7 +136,7 @@ void kasan_unpoison_shadow(const void *address, size_t size) */ address = reset_tag(address); - kasan_poison_shadow(address, size, tag); + poison_range(address, size, tag); if (size & KASAN_SHADOW_MASK) { u8 *shadow = (u8 *)kasan_mem_to_shadow(address + size); @@ -148,12 +148,17 @@ void kasan_unpoison_shadow(const void *address, size_t size) } } +void kasan_unpoison_range(const void *address, size_t size) +{ + unpoison_range(address, size); +} + static void __kasan_unpoison_stack(struct task_struct *task, const void *sp) { void *base = task_stack_page(task); size_t size = sp - base; - kasan_unpoison_shadow(base, size); + unpoison_range(base, size); } /* Unpoison the entire stack for a task. */ @@ -172,7 +177,7 @@ asmlinkage void kasan_unpoison_task_stack_below(const void *watermark) */ void *base = (void *)((unsigned long)watermark & ~(THREAD_SIZE - 1)); - kasan_unpoison_shadow(base, watermark - base); + unpoison_range(base, watermark - base); } void kasan_alloc_pages(struct page *page, unsigned int order) @@ -186,13 +191,13 @@ void kasan_alloc_pages(struct page *page, unsigned int order) tag = random_tag(); for (i = 0; i < (1 << order); i++) page_kasan_tag_set(page + i, tag); - kasan_unpoison_shadow(page_address(page), PAGE_SIZE << order); + unpoison_range(page_address(page), PAGE_SIZE << order); } void kasan_free_pages(struct page *page, unsigned int order) { if (likely(!PageHighMem(page))) - kasan_poison_shadow(page_address(page), + poison_range(page_address(page), PAGE_SIZE << order, KASAN_FREE_PAGE); } @@ -284,18 +289,18 @@ void kasan_poison_slab(struct page *page) for (i = 0; i < compound_nr(page); i++) page_kasan_tag_reset(page + i); - kasan_poison_shadow(page_address(page), page_size(page), - KASAN_KMALLOC_REDZONE); + poison_range(page_address(page), page_size(page), + KASAN_KMALLOC_REDZONE); } void kasan_unpoison_object_data(struct kmem_cache *cache, void *object) { - kasan_unpoison_shadow(object, cache->object_size); + unpoison_range(object, cache->object_size); } void kasan_poison_object_data(struct kmem_cache *cache, void *object) { - kasan_poison_shadow(object, + poison_range(object, round_up(cache->object_size, KASAN_SHADOW_SCALE_SIZE), KASAN_KMALLOC_REDZONE); } @@ -408,7 +413,7 @@ static bool __kasan_slab_free(struct kmem_cache *cache, void *object, } rounded_up_size = round_up(cache->object_size, KASAN_SHADOW_SCALE_SIZE); - kasan_poison_shadow(object, rounded_up_size, KASAN_KMALLOC_FREE); + poison_range(object, rounded_up_size, KASAN_KMALLOC_FREE); if ((IS_ENABLED(CONFIG_KASAN_GENERIC) && !quarantine) || unlikely(!(cache->flags & SLAB_KASAN))) @@ -448,9 +453,9 @@ static void *__kasan_kmalloc(struct kmem_cache *cache, const void *object, tag = assign_tag(cache, object, false, keep_tag); /* Tag is ignored in set_tag without CONFIG_KASAN_SW_TAGS */ - kasan_unpoison_shadow(set_tag(object, tag), size); - kasan_poison_shadow((void *)redzone_start, redzone_end - redzone_start, - KASAN_KMALLOC_REDZONE); + unpoison_range(set_tag(object, tag), size); + poison_range((void *)redzone_start, redzone_end - redzone_start, + KASAN_KMALLOC_REDZONE); if (cache->flags & SLAB_KASAN) kasan_set_track(&get_alloc_info(cache, object)->alloc_track, flags); @@ -489,9 +494,9 @@ void * __must_check kasan_kmalloc_large(const void *ptr, size_t size, KASAN_SHADOW_SCALE_SIZE); redzone_end = (unsigned long)ptr + page_size(page); - kasan_unpoison_shadow(ptr, size); - kasan_poison_shadow((void *)redzone_start, redzone_end - redzone_start, - KASAN_PAGE_REDZONE); + unpoison_range(ptr, size); + poison_range((void *)redzone_start, redzone_end - redzone_start, + KASAN_PAGE_REDZONE); return (void *)ptr; } @@ -523,7 +528,7 @@ void kasan_poison_kfree(void *ptr, unsigned long ip) kasan_report_invalid_free(ptr, ip); return; } - kasan_poison_shadow(ptr, page_size(page), KASAN_FREE_PAGE); + poison_range(ptr, page_size(page), KASAN_FREE_PAGE); } else { __kasan_slab_free(page->slab_cache, ptr, ip, false); } @@ -709,7 +714,7 @@ int kasan_populate_vmalloc(unsigned long addr, unsigned long size) * // vmalloc() allocates memory * // let a = area->addr * // we reach kasan_populate_vmalloc - * // and call kasan_unpoison_shadow: + * // and call unpoison_range: * STORE shadow(a), unpoison_val * ... * STORE shadow(a+99), unpoison_val x = LOAD p @@ -744,7 +749,7 @@ void kasan_poison_vmalloc(const void *start, unsigned long size) return; size = round_up(size, KASAN_SHADOW_SCALE_SIZE); - kasan_poison_shadow(start, size, KASAN_VMALLOC_INVALID); + poison_range(start, size, KASAN_VMALLOC_INVALID); } void kasan_unpoison_vmalloc(const void *start, unsigned long size) @@ -752,7 +757,7 @@ void kasan_unpoison_vmalloc(const void *start, unsigned long size) if (!is_vmalloc_or_module_addr(start)) return; - kasan_unpoison_shadow(start, size); + unpoison_range(start, size); } static int kasan_depopulate_vmalloc_pte(pte_t *ptep, unsigned long addr, |