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Mempools keep allocated objects in reserved for situations when ordinary allocation may not be possible to satisfy. These objects shouldn't be accessed before they leave the pool. This patch poison elements when get into the pool and unpoison when they leave it. This will let KASan to detect use-after-free of mempool's elements. Signed-off-by: Andrey Ryabinin <a.ryabinin@samsung.com> Tested-by: David Rientjes <rientjes@google.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Dmitry Chernenkov <drcheren@gmail.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Alexander Potapenko <glider@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
89 lines
2.8 KiB
C
89 lines
2.8 KiB
C
#ifndef _LINUX_KASAN_H
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#define _LINUX_KASAN_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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#define KASAN_SHADOW_OFFSET _AC(CONFIG_KASAN_SHADOW_OFFSET, UL)
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#include <asm/kasan.h>
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#include <linux/sched.h>
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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_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_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);
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void kasan_kfree_large(const void *ptr);
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void kasan_kfree(void *ptr);
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void kasan_kmalloc(struct kmem_cache *s, const void *object, size_t size);
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void kasan_krealloc(const void *object, size_t new_size);
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void kasan_slab_alloc(struct kmem_cache *s, void *object);
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void kasan_slab_free(struct kmem_cache *s, void *object);
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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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#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_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_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) {}
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static inline void kasan_kfree_large(const void *ptr) {}
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static inline void kasan_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) {}
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static inline void kasan_krealloc(const void *object, size_t new_size) {}
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static inline void kasan_slab_alloc(struct kmem_cache *s, void *object) {}
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static inline void kasan_slab_free(struct kmem_cache *s, void *object) {}
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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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#endif /* CONFIG_KASAN */
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#endif /* LINUX_KASAN_H */
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