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Wed, 11 Nov 2020 11:09:04 -0800 (PST) Date: Wed, 11 Nov 2020 20:08:59 +0100 From: Marco Elver To: Andrey Konovalov Cc: Dmitry Vyukov , Alexander Potapenko , Catalin Marinas , Will Deacon , Vincenzo Frascino , Evgenii Stepanov , Andrey Ryabinin , Branislav Rankov , Kevin Brodsky , Andrew Morton , kasan-dev@googlegroups.com, linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2 15/20] kasan: don't round_up too much Message-ID: <20201111190859.GQ517454@elver.google.com> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.14.6 (2020-07-11) 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: On Tue, Nov 10, 2020 at 11:20PM +0100, Andrey Konovalov wrote: > For hardware tag-based mode kasan_poison_memory() already rounds up the > size. Do the same for software modes and remove round_up() from the common > code. > > Signed-off-by: Andrey Konovalov > Reviewed-by: Dmitry Vyukov > Link: https://linux-review.googlesource.com/id/Ib397128fac6eba874008662b4964d65352db4aa4 > --- > mm/kasan/common.c | 8 ++------ > mm/kasan/shadow.c | 1 + > 2 files changed, 3 insertions(+), 6 deletions(-) Reviewed-by: Marco Elver > diff --git a/mm/kasan/common.c b/mm/kasan/common.c > index 60793f8695a8..69ab880abacc 100644 > --- a/mm/kasan/common.c > +++ b/mm/kasan/common.c > @@ -218,9 +218,7 @@ void __kasan_unpoison_object_data(struct kmem_cache *cache, void *object) > > void __kasan_poison_object_data(struct kmem_cache *cache, void *object) > { > - kasan_poison_memory(object, > - round_up(cache->object_size, KASAN_GRANULE_SIZE), > - KASAN_KMALLOC_REDZONE); > + kasan_poison_memory(object, cache->object_size, KASAN_KMALLOC_REDZONE); > } > > /* > @@ -293,7 +291,6 @@ static bool ____kasan_slab_free(struct kmem_cache *cache, void *object, > { > u8 tag; > void *tagged_object; > - unsigned long rounded_up_size; > > tag = get_tag(object); > tagged_object = object; > @@ -314,8 +311,7 @@ static bool ____kasan_slab_free(struct kmem_cache *cache, void *object, > return true; > } > > - rounded_up_size = round_up(cache->object_size, KASAN_GRANULE_SIZE); > - kasan_poison_memory(object, rounded_up_size, KASAN_KMALLOC_FREE); > + kasan_poison_memory(object, cache->object_size, KASAN_KMALLOC_FREE); > > if (!kasan_stack_collection_enabled()) > return false; > diff --git a/mm/kasan/shadow.c b/mm/kasan/shadow.c > index 8e4fa9157a0b..3f64c9ecbcc0 100644 > --- a/mm/kasan/shadow.c > +++ b/mm/kasan/shadow.c > @@ -82,6 +82,7 @@ void kasan_poison_memory(const void *address, size_t size, u8 value) > * addresses to this function. > */ > address = kasan_reset_tag(address); > + size = round_up(size, KASAN_GRANULE_SIZE); > > shadow_start = kasan_mem_to_shadow(address); > shadow_end = kasan_mem_to_shadow(address + size); > -- > 2.29.2.222.g5d2a92d10f8-goog >