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9b75a867cc
Currently we may put reserved by mempool elements into quarantine via
kasan_kfree(). This is totally wrong since quarantine may really free
these objects. So when mempool will try to use such element,
use-after-free will happen. Or mempool may decide that it no longer
need that element and double-free it.
So don't put object into quarantine in kasan_kfree(), just poison it.
Rename kasan_kfree() to kasan_poison_kfree() to respect that.
Also, we shouldn't use kasan_slab_alloc()/kasan_krealloc() in
kasan_unpoison_element() because those functions may update allocation
stacktrace. This would be wrong for the most of the remove_element call
sites.
(The only call site where we may want to update alloc stacktrace is
in mempool_alloc(). Kmemleak solves this by calling
kmemleak_update_trace(), so we could make something like that too.
But this is out of scope of this patch).
Fixes: 55834c5909 ("mm: kasan: initial memory quarantine implementation")
Link: http://lkml.kernel.org/r/575977C3.1010905@virtuozzo.com
Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Reported-by: Kuthonuzo Luruo <kuthonuzo.luruo@hpe.com>
Acked-by: Alexander Potapenko <glider@google.com>
Cc: Dmitriy Vyukov <dvyukov@google.com>
Cc: Kostya Serebryany <kcc@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
128 lines
4.0 KiB
C
128 lines
4.0 KiB
C
#ifndef _LINUX_KASAN_H
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#define _LINUX_KASAN_H
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#include <linux/sched.h>
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#include <linux/types.h>
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struct kmem_cache;
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struct page;
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struct vm_struct;
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#ifdef CONFIG_KASAN
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#define KASAN_SHADOW_SCALE_SHIFT 3
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#include <asm/kasan.h>
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#include <asm/pgtable.h>
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extern unsigned char kasan_zero_page[PAGE_SIZE];
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extern pte_t kasan_zero_pte[PTRS_PER_PTE];
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extern pmd_t kasan_zero_pmd[PTRS_PER_PMD];
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extern pud_t kasan_zero_pud[PTRS_PER_PUD];
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void kasan_populate_zero_shadow(const void *shadow_start,
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const void *shadow_end);
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static inline void *kasan_mem_to_shadow(const void *addr)
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{
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return (void *)((unsigned long)addr >> KASAN_SHADOW_SCALE_SHIFT)
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+ KASAN_SHADOW_OFFSET;
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}
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/* Enable reporting bugs after kasan_disable_current() */
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static inline void kasan_enable_current(void)
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{
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current->kasan_depth++;
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}
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/* Disable reporting bugs for current task */
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static inline void kasan_disable_current(void)
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{
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current->kasan_depth--;
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}
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void kasan_unpoison_shadow(const void *address, size_t size);
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void kasan_unpoison_task_stack(struct task_struct *task);
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void kasan_alloc_pages(struct page *page, unsigned int order);
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void kasan_free_pages(struct page *page, unsigned int order);
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void kasan_cache_create(struct kmem_cache *cache, size_t *size,
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unsigned long *flags);
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void kasan_cache_shrink(struct kmem_cache *cache);
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void kasan_cache_destroy(struct kmem_cache *cache);
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void kasan_poison_slab(struct page *page);
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void kasan_unpoison_object_data(struct kmem_cache *cache, void *object);
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void kasan_poison_object_data(struct kmem_cache *cache, void *object);
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void kasan_kmalloc_large(const void *ptr, size_t size, gfp_t flags);
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void kasan_kfree_large(const void *ptr);
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void kasan_poison_kfree(void *ptr);
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void kasan_kmalloc(struct kmem_cache *s, const void *object, size_t size,
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gfp_t flags);
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void kasan_krealloc(const void *object, size_t new_size, gfp_t flags);
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void kasan_slab_alloc(struct kmem_cache *s, void *object, gfp_t flags);
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bool kasan_slab_free(struct kmem_cache *s, void *object);
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struct kasan_cache {
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int alloc_meta_offset;
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int free_meta_offset;
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};
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int kasan_module_alloc(void *addr, size_t size);
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void kasan_free_shadow(const struct vm_struct *vm);
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size_t ksize(const void *);
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static inline void kasan_unpoison_slab(const void *ptr) { ksize(ptr); }
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#else /* CONFIG_KASAN */
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static inline void kasan_unpoison_shadow(const void *address, size_t size) {}
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static inline void kasan_unpoison_task_stack(struct task_struct *task) {}
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static inline void kasan_enable_current(void) {}
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static inline void kasan_disable_current(void) {}
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static inline void kasan_alloc_pages(struct page *page, unsigned int order) {}
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static inline void kasan_free_pages(struct page *page, unsigned int order) {}
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static inline void kasan_cache_create(struct kmem_cache *cache,
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size_t *size,
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unsigned long *flags) {}
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static inline void kasan_cache_shrink(struct kmem_cache *cache) {}
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static inline void kasan_cache_destroy(struct kmem_cache *cache) {}
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static inline void kasan_poison_slab(struct page *page) {}
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static inline void kasan_unpoison_object_data(struct kmem_cache *cache,
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void *object) {}
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static inline void kasan_poison_object_data(struct kmem_cache *cache,
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void *object) {}
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static inline void kasan_kmalloc_large(void *ptr, size_t size, gfp_t flags) {}
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static inline void kasan_kfree_large(const void *ptr) {}
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static inline void kasan_poison_kfree(void *ptr) {}
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static inline void kasan_kmalloc(struct kmem_cache *s, const void *object,
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size_t size, gfp_t flags) {}
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static inline void kasan_krealloc(const void *object, size_t new_size,
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gfp_t flags) {}
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static inline void kasan_slab_alloc(struct kmem_cache *s, void *object,
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gfp_t flags) {}
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static inline bool kasan_slab_free(struct kmem_cache *s, void *object)
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{
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return false;
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}
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static inline int kasan_module_alloc(void *addr, size_t size) { return 0; }
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static inline void kasan_free_shadow(const struct vm_struct *vm) {}
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static inline void kasan_unpoison_slab(const void *ptr) { }
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#endif /* CONFIG_KASAN */
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#endif /* LINUX_KASAN_H */
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