kasan: introduce kasan_init_object_meta
Add a kasan_init_object_meta() helper that initializes metadata for a slab object and use it in the common code. For now, the implementations of this helper are the same for the Generic and tag-based modes, but they will diverge later in the series. This change hides references to alloc_meta from the common code. This is desired as only the Generic mode will be using per-object metadata after this series. Link: https://lkml.kernel.org/r/47c12938fc7f8105e7aaa592527c0e9d3c81fc37.1662411799.git.andreyknvl@google.com Signed-off-by: Andrey Konovalov <andreyknvl@google.com> Reviewed-by: Marco Elver <elver@google.com> Cc: Alexander Potapenko <glider@google.com> Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Evgenii Stepanov <eugenis@google.com> Cc: Peter Collingbourne <pcc@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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@ -313,13 +313,9 @@ static inline u8 assign_tag(struct kmem_cache *cache,
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void * __must_check __kasan_init_slab_obj(struct kmem_cache *cache,
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const void *object)
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{
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struct kasan_alloc_meta *alloc_meta;
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if (kasan_stack_collection_enabled()) {
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alloc_meta = kasan_get_alloc_meta(cache, object);
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if (alloc_meta)
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__memset(alloc_meta, 0, sizeof(*alloc_meta));
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}
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/* Initialize per-object metadata if it is present. */
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if (kasan_stack_collection_enabled())
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kasan_init_object_meta(cache, object);
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/* Tag is ignored in set_tag() without CONFIG_KASAN_SW/HW_TAGS */
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object = set_tag(object, assign_tag(cache, object, true));
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@ -328,6 +328,15 @@ DEFINE_ASAN_SET_SHADOW(f3);
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DEFINE_ASAN_SET_SHADOW(f5);
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DEFINE_ASAN_SET_SHADOW(f8);
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void kasan_init_object_meta(struct kmem_cache *cache, const void *object)
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{
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struct kasan_alloc_meta *alloc_meta;
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alloc_meta = kasan_get_alloc_meta(cache, object);
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if (alloc_meta)
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__memset(alloc_meta, 0, sizeof(*alloc_meta));
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}
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static void __kasan_record_aux_stack(void *addr, bool can_alloc)
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{
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struct slab *slab = kasan_addr_to_slab(addr);
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@ -279,6 +279,8 @@ void kasan_report_invalid_free(void *object, unsigned long ip, enum kasan_report
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struct page *kasan_addr_to_page(const void *addr);
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struct slab *kasan_addr_to_slab(const void *addr);
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void kasan_init_object_meta(struct kmem_cache *cache, const void *object);
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depot_stack_handle_t kasan_save_stack(gfp_t flags, bool can_alloc);
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void kasan_set_track(struct kasan_track *track, gfp_t flags);
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void kasan_save_alloc_info(struct kmem_cache *cache, void *object, gfp_t flags);
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@ -17,6 +17,15 @@
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#include "kasan.h"
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void kasan_init_object_meta(struct kmem_cache *cache, const void *object)
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{
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struct kasan_alloc_meta *alloc_meta;
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alloc_meta = kasan_get_alloc_meta(cache, object);
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if (alloc_meta)
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__memset(alloc_meta, 0, sizeof(*alloc_meta));
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}
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void kasan_save_alloc_info(struct kmem_cache *cache, void *object, gfp_t flags)
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{
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struct kasan_alloc_meta *alloc_meta;
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