diff options
Diffstat (limited to 'mm/slab.h')
| -rw-r--r-- | mm/slab.h | 25 |
1 files changed, 19 insertions, 6 deletions
diff --git a/mm/slab.h b/mm/slab.h index 076582f58f68..18c1927cd196 100644 --- a/mm/slab.h +++ b/mm/slab.h @@ -506,15 +506,24 @@ static inline struct kmem_cache *slab_pre_alloc_hook(struct kmem_cache *s, } static inline void slab_post_alloc_hook(struct kmem_cache *s, - struct obj_cgroup *objcg, - gfp_t flags, size_t size, void **p) + struct obj_cgroup *objcg, gfp_t flags, + size_t size, void **p, bool init) { size_t i; flags &= gfp_allowed_mask; + + /* + * As memory initialization might be integrated into KASAN, + * kasan_slab_alloc and initialization memset must be + * kept together to avoid discrepancies in behavior. + * + * As p[i] might get tagged, memset and kmemleak hook come after KASAN. + */ for (i = 0; i < size; i++) { - p[i] = kasan_slab_alloc(s, p[i], flags); - /* As p[i] might get tagged, call kmemleak hook after KASAN. */ + p[i] = kasan_slab_alloc(s, p[i], flags, init); + if (p[i] && init && !kasan_has_integrated_init()) + memset(p[i], 0, s->object_size); kmemleak_alloc_recursive(p[i], s->object_size, 1, s->flags, flags); } @@ -601,7 +610,8 @@ static inline void cache_random_seq_destroy(struct kmem_cache *cachep) { } static inline bool slab_want_init_on_alloc(gfp_t flags, struct kmem_cache *c) { - if (static_branch_unlikely(&init_on_alloc)) { + if (static_branch_maybe(CONFIG_INIT_ON_ALLOC_DEFAULT_ON, + &init_on_alloc)) { if (c->ctor) return false; if (c->flags & (SLAB_TYPESAFE_BY_RCU | SLAB_POISON)) @@ -613,12 +623,14 @@ static inline bool slab_want_init_on_alloc(gfp_t flags, struct kmem_cache *c) static inline bool slab_want_init_on_free(struct kmem_cache *c) { - if (static_branch_unlikely(&init_on_free)) + if (static_branch_maybe(CONFIG_INIT_ON_FREE_DEFAULT_ON, + &init_on_free)) return !(c->ctor || (c->flags & (SLAB_TYPESAFE_BY_RCU | SLAB_POISON))); return false; } +#ifdef CONFIG_PRINTK #define KS_ADDRS_COUNT 16 struct kmem_obj_info { void *kp_ptr; @@ -630,5 +642,6 @@ struct kmem_obj_info { void *kp_stack[KS_ADDRS_COUNT]; }; void kmem_obj_info(struct kmem_obj_info *kpp, void *object, struct page *page); +#endif #endif /* MM_SLAB_H */ |