47b5c2a0f0
Size of slab object already stored in cache->object_size. Note, that kmalloc() internally rounds up size of allocation, so object_size may be not equal to alloc_size, but, usually we don't need to know the exact size of allocated object. In case if we need that information, we still can figure it out from the report. The dump of shadow memory allows to identify the end of allocated memory, and thereby the exact allocation size. Link: http://lkml.kernel.org/r/1470062715-14077-4-git-send-email-aryabinin@virtuozzo.com Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com> Cc: Alexander Potapenko <glider@google.com> Cc: Dmitry Vyukov <dvyukov@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
123 lines
3.3 KiB
C
123 lines
3.3 KiB
C
#ifndef __MM_KASAN_KASAN_H
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#define __MM_KASAN_KASAN_H
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#include <linux/kasan.h>
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#include <linux/stackdepot.h>
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#define KASAN_SHADOW_SCALE_SIZE (1UL << KASAN_SHADOW_SCALE_SHIFT)
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#define KASAN_SHADOW_MASK (KASAN_SHADOW_SCALE_SIZE - 1)
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#define KASAN_FREE_PAGE 0xFF /* page was freed */
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#define KASAN_PAGE_REDZONE 0xFE /* redzone for kmalloc_large allocations */
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#define KASAN_KMALLOC_REDZONE 0xFC /* redzone inside slub object */
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#define KASAN_KMALLOC_FREE 0xFB /* object was freed (kmem_cache_free/kfree) */
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#define KASAN_GLOBAL_REDZONE 0xFA /* redzone for global variable */
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/*
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* Stack redzone shadow values
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* (Those are compiler's ABI, don't change them)
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*/
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#define KASAN_STACK_LEFT 0xF1
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#define KASAN_STACK_MID 0xF2
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#define KASAN_STACK_RIGHT 0xF3
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#define KASAN_STACK_PARTIAL 0xF4
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/* Don't break randconfig/all*config builds */
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#ifndef KASAN_ABI_VERSION
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#define KASAN_ABI_VERSION 1
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#endif
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struct kasan_access_info {
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const void *access_addr;
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const void *first_bad_addr;
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size_t access_size;
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bool is_write;
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unsigned long ip;
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};
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/* The layout of struct dictated by compiler */
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struct kasan_source_location {
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const char *filename;
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int line_no;
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int column_no;
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};
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/* The layout of struct dictated by compiler */
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struct kasan_global {
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const void *beg; /* Address of the beginning of the global variable. */
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size_t size; /* Size of the global variable. */
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size_t size_with_redzone; /* Size of the variable + size of the red zone. 32 bytes aligned */
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const void *name;
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const void *module_name; /* Name of the module where the global variable is declared. */
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unsigned long has_dynamic_init; /* This needed for C++ */
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#if KASAN_ABI_VERSION >= 4
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struct kasan_source_location *location;
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#endif
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};
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/**
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* Structures to keep alloc and free tracks *
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*/
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enum kasan_state {
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KASAN_STATE_INIT,
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KASAN_STATE_ALLOC,
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KASAN_STATE_QUARANTINE,
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KASAN_STATE_FREE
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};
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#define KASAN_STACK_DEPTH 64
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struct kasan_track {
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u32 pid;
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depot_stack_handle_t stack;
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};
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struct kasan_alloc_meta {
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struct kasan_track track;
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u32 state;
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};
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struct qlist_node {
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struct qlist_node *next;
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};
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struct kasan_free_meta {
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/* This field is used while the object is in the quarantine.
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* Otherwise it might be used for the allocator freelist.
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*/
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struct qlist_node quarantine_link;
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struct kasan_track track;
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};
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struct kasan_alloc_meta *get_alloc_info(struct kmem_cache *cache,
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const void *object);
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struct kasan_free_meta *get_free_info(struct kmem_cache *cache,
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const void *object);
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static inline const void *kasan_shadow_to_mem(const void *shadow_addr)
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{
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return (void *)(((unsigned long)shadow_addr - KASAN_SHADOW_OFFSET)
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<< KASAN_SHADOW_SCALE_SHIFT);
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}
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static inline bool kasan_report_enabled(void)
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{
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return !current->kasan_depth;
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}
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void kasan_report(unsigned long addr, size_t size,
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bool is_write, unsigned long ip);
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#if defined(CONFIG_SLAB) || defined(CONFIG_SLUB)
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void quarantine_put(struct kasan_free_meta *info, struct kmem_cache *cache);
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void quarantine_reduce(void);
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void quarantine_remove_cache(struct kmem_cache *cache);
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#else
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static inline void quarantine_put(struct kasan_free_meta *info,
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struct kmem_cache *cache) { }
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static inline void quarantine_reduce(void) { }
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static inline void quarantine_remove_cache(struct kmem_cache *cache) { }
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#endif
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#endif
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