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Wed, 30 Oct 2019 07:23:36 -0700 (PDT) Date: Wed, 30 Oct 2019 15:22:29 +0100 In-Reply-To: <20191030142237.249532-1-glider@google.com> Message-Id: <20191030142237.249532-18-glider@google.com> Mime-Version: 1.0 References: <20191030142237.249532-1-glider@google.com> X-Mailer: git-send-email 2.24.0.rc0.303.g954a862665-goog Subject: [PATCH RFC v2 17/25] kmsan: mm: call KMSAN hooks from SLUB code From: glider@google.com To: Andrew Morton , Vegard Nossum , Dmitry Vyukov , linux-mm@kvack.org Cc: viro@zeniv.linux.org.uk, aryabinin@virtuozzo.com, luto@kernel.org, ard.biesheuvel@linaro.org, arnd@arndb.de, hch@lst.de, dmitry.torokhov@gmail.com, edumazet@google.com, ericvh@gmail.com, gregkh@linuxfoundation.org, harry.wentland@amd.com, herbert@gondor.apana.org.au, mingo@elte.hu, axboe@kernel.dk, martin.petersen@oracle.com, schwidefsky@de.ibm.com, mst@redhat.com, monstr@monstr.eu, pmladek@suse.com, sergey.senozhatsky@gmail.com, rostedt@goodmis.org, tiwai@suse.com, tytso@mit.edu, tglx@linutronix.de, wsa@the-dreams.de, gor@linux.ibm.com, iii@linux.ibm.com, mark.rutland@arm.com, willy@infradead.org, rdunlap@infradead.org, andreyknvl@google.com, elver@google.com, Alexander Potapenko Content-Type: text/plain; charset="UTF-8" X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: In order to report uninitialized memory coming from heap allocations KMSAN has to poison them unless they're created with __GFP_ZERO. It's handy that we need KMSAN hooks in the places where init_on_alloc/init_on_free initialization is performed. Signed-off-by: Alexander Potapenko To: Alexander Potapenko Cc: Andrew Morton Cc: Vegard Nossum Cc: Dmitry Vyukov Cc: linux-mm@kvack.org --- Change-Id: I51103b7981d3aabed747d0c85cbdc85568665871 --- mm/slub.c | 37 +++++++++++++++++++++++++++++++------ 1 file changed, 31 insertions(+), 6 deletions(-) diff --git a/mm/slub.c b/mm/slub.c index b25c807a111f..8b7069812801 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -21,6 +21,8 @@ #include #include #include +#include +#include /* KMSAN_INIT_VALUE */ #include #include #include @@ -285,17 +287,27 @@ static void prefetch_freepointer(const struct kmem_cache *s, void *object) prefetch(object + s->offset); } +/* + * When running under KMSAN, get_freepointer_safe() may return an uninitialized + * pointer value in the case the current thread loses the race for the next + * memory chunk in the freelist. In that case this_cpu_cmpxchg_double() in + * slab_alloc_node() will fail, so the uninitialized value won't be used, but + * KMSAN will still check all arguments of cmpxchg because of imperfect + * handling of inline assembly. + * To work around this problem, use KMSAN_INIT_VALUE() to force initialize the + * return value of get_freepointer_safe(). + */ static inline void *get_freepointer_safe(struct kmem_cache *s, void *object) { unsigned long freepointer_addr; void *p; if (!debug_pagealloc_enabled()) - return get_freepointer(s, object); + return KMSAN_INIT_VALUE(get_freepointer(s, object)); freepointer_addr = (unsigned long)object + s->offset; probe_kernel_read(&p, (void **)freepointer_addr, sizeof(p)); - return freelist_ptr(s, p, freepointer_addr); + return KMSAN_INIT_VALUE(freelist_ptr(s, p, freepointer_addr)); } static inline void set_freepointer(struct kmem_cache *s, void *object, void *fp) @@ -1390,6 +1402,7 @@ static inline void *kmalloc_large_node_hook(void *ptr, size_t size, gfp_t flags) ptr = kasan_kmalloc_large(ptr, size, flags); /* As ptr might get tagged, call kmemleak hook after KASAN. */ kmemleak_alloc(ptr, size, 1, flags); + kmsan_kmalloc_large(ptr, size, flags); return ptr; } @@ -1397,6 +1410,7 @@ static __always_inline void kfree_hook(void *x) { kmemleak_free(x); kasan_kfree_large(x, _RET_IP_); + kmsan_kfree_large(x); } static __always_inline bool slab_free_hook(struct kmem_cache *s, void *x) @@ -1453,6 +1467,12 @@ static inline bool slab_free_freelist_hook(struct kmem_cache *s, } while (object != old_tail); } + do { + object = next; + next = get_freepointer(s, object); + kmsan_slab_free(s, object); + } while (object != old_tail); + /* * Compiler cannot detect this function can be removed if slab_free_hook() * evaluates to nothing. Thus, catch all relevant config debug options here. @@ -2776,6 +2796,7 @@ static __always_inline void *slab_alloc_node(struct kmem_cache *s, if (unlikely(slab_want_init_on_alloc(gfpflags, s)) && object) memset(object, 0, s->object_size); + kmsan_slab_alloc(s, object, gfpflags); slab_post_alloc_hook(s, gfpflags, 1, &object); return object; @@ -2804,6 +2825,7 @@ void *kmem_cache_alloc_trace(struct kmem_cache *s, gfp_t gfpflags, size_t size) void *ret = slab_alloc(s, gfpflags, _RET_IP_); trace_kmalloc(_RET_IP_, ret, size, s->size, gfpflags); ret = kasan_kmalloc(s, ret, size, gfpflags); + return ret; } EXPORT_SYMBOL(kmem_cache_alloc_trace); @@ -2816,7 +2838,6 @@ void *kmem_cache_alloc_node(struct kmem_cache *s, gfp_t gfpflags, int node) trace_kmem_cache_alloc_node(_RET_IP_, ret, s->object_size, s->size, gfpflags, node); - return ret; } EXPORT_SYMBOL(kmem_cache_alloc_node); @@ -2832,6 +2853,7 @@ void *kmem_cache_alloc_node_trace(struct kmem_cache *s, size, s->size, gfpflags, node); ret = kasan_kmalloc(s, ret, size, gfpflags); + return ret; } EXPORT_SYMBOL(kmem_cache_alloc_node_trace); @@ -3157,7 +3179,7 @@ int kmem_cache_alloc_bulk(struct kmem_cache *s, gfp_t flags, size_t size, void **p) { struct kmem_cache_cpu *c; - int i; + int i, j; /* memcg and kmem_cache debug support */ s = slab_pre_alloc_hook(s, flags); @@ -3198,11 +3220,11 @@ int kmem_cache_alloc_bulk(struct kmem_cache *s, gfp_t flags, size_t size, /* 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(p[j], 0, s->object_size); } + for (j = 0; j < i; j++) + kmsan_slab_alloc(s, p[j], flags); /* memcg and kmem_cache debug support */ slab_post_alloc_hook(s, flags, size, p); @@ -3803,6 +3825,7 @@ static int __init setup_slub_min_objects(char *str) __setup("slub_min_objects=", setup_slub_min_objects); +__no_sanitize_memory void *__kmalloc(size_t size, gfp_t flags) { struct kmem_cache *s; @@ -5717,6 +5740,7 @@ static char *create_unique_id(struct kmem_cache *s) p += sprintf(p, "%07u", s->size); BUG_ON(p > name + ID_STR_LENGTH - 1); + kmsan_unpoison_shadow(name, p - name); return name; } @@ -5866,6 +5890,7 @@ static int sysfs_slab_alias(struct kmem_cache *s, const char *name) al->name = name; al->next = alias_list; alias_list = al; + kmsan_unpoison_shadow(al, sizeof(struct saved_alias)); return 0; } -- 2.24.0.rc0.303.g954a862665-goog