From: Andrey Konovalov <andreyknvl@xxxxxxxxxx> Subject: kasan, mm: integrate slab init_on_alloc with HW_TAGS This change uses the previously added memory initialization feature of HW_TAGS KASAN routines for slab memory when init_on_alloc is enabled. With this change, memory initialization memset() is no longer called when both HW_TAGS KASAN and init_on_alloc are enabled. Instead, memory is initialized in KASAN runtime. The memory initialization memset() is moved into slab_post_alloc_hook() that currently directly follows the initialization loop. A new argument is added to slab_post_alloc_hook() that indicates whether to initialize the memory or not. To avoid discrepancies with which memory gets initialized that can be caused by future changes, both KASAN hook and initialization memset() are put together and a warning comment is added. Combining setting allocation tags with memory initialization improves HW_TAGS KASAN performance when init_on_alloc is enabled. Link: https://lkml.kernel.org/r/c1292aeb5d519da221ec74a0684a949b027d7720.1615296150.git.andreyknvl@xxxxxxxxxx Signed-off-by: Andrey Konovalov <andreyknvl@xxxxxxxxxx> Reviewed-by: Marco Elver <elver@xxxxxxxxxx> Cc: Alexander Potapenko <glider@xxxxxxxxxx> Cc: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx> Cc: Branislav Rankov <Branislav.Rankov@xxxxxxx> Cc: Catalin Marinas <catalin.marinas@xxxxxxx> Cc: Christoph Lameter <cl@xxxxxxxxx> Cc: David Rientjes <rientjes@xxxxxxxxxx> Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx> Cc: Evgenii Stepanov <eugenis@xxxxxxxxxx> Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx> Cc: Kevin Brodsky <kevin.brodsky@xxxxxxx> Cc: Pekka Enberg <penberg@xxxxxxxxxx> Cc: Peter Collingbourne <pcc@xxxxxxxxxx> Cc: Vincenzo Frascino <vincenzo.frascino@xxxxxxx> Cc: Vlastimil Babka <vbabka@xxxxxxx> Cc: Will Deacon <will.deacon@xxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- include/linux/kasan.h | 8 ++++---- mm/kasan/common.c | 4 ++-- mm/slab.c | 28 +++++++++++++--------------- mm/slab.h | 17 +++++++++++++---- mm/slub.c | 27 +++++++++++---------------- 5 files changed, 43 insertions(+), 41 deletions(-) --- a/include/linux/kasan.h~kasan-mm-integrate-slab-init_on_alloc-with-hw_tags +++ a/include/linux/kasan.h @@ -226,12 +226,12 @@ static __always_inline void kasan_slab_f } void * __must_check __kasan_slab_alloc(struct kmem_cache *s, - void *object, gfp_t flags); + void *object, gfp_t flags, bool init); static __always_inline void * __must_check kasan_slab_alloc( - struct kmem_cache *s, void *object, gfp_t flags) + struct kmem_cache *s, void *object, gfp_t flags, bool init) { if (kasan_enabled()) - return __kasan_slab_alloc(s, object, flags); + return __kasan_slab_alloc(s, object, flags, init); return object; } @@ -320,7 +320,7 @@ static inline bool kasan_slab_free(struc static inline void kasan_kfree_large(void *ptr) {} static inline void kasan_slab_free_mempool(void *ptr) {} static inline void *kasan_slab_alloc(struct kmem_cache *s, void *object, - gfp_t flags) + gfp_t flags, bool init) { return object; } --- a/mm/kasan/common.c~kasan-mm-integrate-slab-init_on_alloc-with-hw_tags +++ a/mm/kasan/common.c @@ -428,7 +428,7 @@ static void set_alloc_info(struct kmem_c } void * __must_check __kasan_slab_alloc(struct kmem_cache *cache, - void *object, gfp_t flags) + void *object, gfp_t flags, bool init) { u8 tag; void *tagged_object; @@ -453,7 +453,7 @@ void * __must_check __kasan_slab_alloc(s * Unpoison the whole object. * For kmalloc() allocations, kasan_kmalloc() will do precise poisoning. */ - kasan_unpoison(tagged_object, cache->object_size, false); + kasan_unpoison(tagged_object, cache->object_size, init); /* Save alloc info (if possible) for non-kmalloc() allocations. */ if (kasan_stack_collection_enabled()) --- a/mm/slab.c~kasan-mm-integrate-slab-init_on_alloc-with-hw_tags +++ a/mm/slab.c @@ -3216,6 +3216,7 @@ slab_alloc_node(struct kmem_cache *cache void *ptr; int slab_node = numa_mem_id(); struct obj_cgroup *objcg = NULL; + bool init = false; flags &= gfp_allowed_mask; cachep = slab_pre_alloc_hook(cachep, &objcg, 1, flags); @@ -3254,12 +3255,10 @@ slab_alloc_node(struct kmem_cache *cache out: local_irq_restore(save_flags); ptr = cache_alloc_debugcheck_after(cachep, flags, ptr, caller); - - if (unlikely(slab_want_init_on_alloc(flags, cachep)) && ptr) - memset(ptr, 0, cachep->object_size); + init = slab_want_init_on_alloc(flags, cachep); out_hooks: - slab_post_alloc_hook(cachep, objcg, flags, 1, &ptr); + slab_post_alloc_hook(cachep, objcg, flags, 1, &ptr, init); return ptr; } @@ -3301,6 +3300,7 @@ slab_alloc(struct kmem_cache *cachep, gf unsigned long save_flags; void *objp; struct obj_cgroup *objcg = NULL; + bool init = false; flags &= gfp_allowed_mask; cachep = slab_pre_alloc_hook(cachep, &objcg, 1, flags); @@ -3317,12 +3317,10 @@ slab_alloc(struct kmem_cache *cachep, gf local_irq_restore(save_flags); objp = cache_alloc_debugcheck_after(cachep, flags, objp, caller); prefetchw(objp); - - if (unlikely(slab_want_init_on_alloc(flags, cachep)) && objp) - memset(objp, 0, cachep->object_size); + init = slab_want_init_on_alloc(flags, cachep); out: - slab_post_alloc_hook(cachep, objcg, flags, 1, &objp); + slab_post_alloc_hook(cachep, objcg, flags, 1, &objp, init); return objp; } @@ -3542,18 +3540,18 @@ int kmem_cache_alloc_bulk(struct kmem_ca cache_alloc_debugcheck_after_bulk(s, flags, size, p, _RET_IP_); - /* Clear memory outside IRQ disabled section */ - if (unlikely(slab_want_init_on_alloc(flags, s))) - for (i = 0; i < size; i++) - memset(p[i], 0, s->object_size); - - slab_post_alloc_hook(s, objcg, flags, size, p); + /* + * memcg and kmem_cache debug support and memory initialization. + * Done outside of the IRQ disabled section. + */ + slab_post_alloc_hook(s, objcg, flags, size, p, + slab_want_init_on_alloc(flags, s)); /* FIXME: Trace call missing. Christoph would like a bulk variant */ return size; error: local_irq_enable(); cache_alloc_debugcheck_after_bulk(s, flags, i, p, _RET_IP_); - slab_post_alloc_hook(s, objcg, flags, i, p); + slab_post_alloc_hook(s, objcg, flags, i, p, false); __kmem_cache_free_bulk(s, i, p); return 0; } --- a/mm/slab.h~kasan-mm-integrate-slab-init_on_alloc-with-hw_tags +++ a/mm/slab.h @@ -509,15 +509,24 @@ static inline struct kmem_cache *slab_pr } 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); } --- a/mm/slub.c~kasan-mm-integrate-slab-init_on_alloc-with-hw_tags +++ a/mm/slub.c @@ -2835,6 +2835,7 @@ static __always_inline void *slab_alloc_ struct page *page; unsigned long tid; struct obj_cgroup *objcg = NULL; + bool init = false; s = slab_pre_alloc_hook(s, &objcg, 1, gfpflags); if (!s) @@ -2912,12 +2913,10 @@ redo: } maybe_wipe_obj_freeptr(s, object); - - if (unlikely(slab_want_init_on_alloc(gfpflags, s)) && object) - memset(kasan_reset_tag(object), 0, s->object_size); + init = slab_want_init_on_alloc(gfpflags, s); out: - slab_post_alloc_hook(s, objcg, gfpflags, 1, &object); + slab_post_alloc_hook(s, objcg, gfpflags, 1, &object, init); return object; } @@ -3369,20 +3368,16 @@ int kmem_cache_alloc_bulk(struct kmem_ca c->tid = next_tid(c->tid); local_irq_enable(); - /* Clear memory outside IRQ disabled fastpath loop */ - if (unlikely(slab_want_init_on_alloc(flags, s))) { - int j; - - for (j = 0; j < i; j++) - memset(kasan_reset_tag(p[j]), 0, s->object_size); - } - - /* memcg and kmem_cache debug support */ - slab_post_alloc_hook(s, objcg, flags, size, p); + /* + * memcg and kmem_cache debug support and memory initialization. + * Done outside of the IRQ disabled fastpath loop. + */ + slab_post_alloc_hook(s, objcg, flags, size, p, + slab_want_init_on_alloc(flags, s)); return i; error: local_irq_enable(); - slab_post_alloc_hook(s, objcg, flags, i, p); + slab_post_alloc_hook(s, objcg, flags, i, p, false); __kmem_cache_free_bulk(s, i, p); return 0; } @@ -3592,7 +3587,7 @@ static void early_kmem_cache_node_alloc( init_object(kmem_cache_node, n, SLUB_RED_ACTIVE); init_tracking(kmem_cache_node, n); #endif - n = kasan_slab_alloc(kmem_cache_node, n, GFP_KERNEL); + n = kasan_slab_alloc(kmem_cache_node, n, GFP_KERNEL, false); page->freelist = get_freepointer(kmem_cache_node, n); page->inuse = 1; page->frozen = 0; _
