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Wed, 25 Mar 2020 09:13:24 -0700 (PDT) Date: Wed, 25 Mar 2020 17:12:20 +0100 In-Reply-To: <20200325161249.55095-1-glider@google.com> Message-Id: <20200325161249.55095-10-glider@google.com> Mime-Version: 1.0 References: <20200325161249.55095-1-glider@google.com> X-Mailer: git-send-email 2.25.1.696.g5e7596f4ac-goog Subject: [PATCH v5 09/38] kmsan: stackdepot: don't allocate KMSAN metadata for stackdepot From: glider@google.com To: Andrey Ryabinin , Jens Axboe , Andy Lutomirski , Vegard Nossum , Dmitry Vyukov , Marco Elver , Andrey Konovalov , Christoph Hellwig , linux-mm@kvack.org Cc: glider@google.com, viro@zeniv.linux.org.uk, adilger.kernel@dilger.ca, akpm@linux-foundation.org, ard.biesheuvel@linaro.org, arnd@arndb.de, hch@infradead.org, darrick.wong@oracle.com, davem@davemloft.net, dmitry.torokhov@gmail.com, ebiggers@google.com, edumazet@google.com, ericvh@gmail.com, gregkh@linuxfoundation.org, harry.wentland@amd.com, herbert@gondor.apana.org.au, iii@linux.ibm.com, mingo@elte.hu, jasowang@redhat.com, m.szyprowski@samsung.com, mark.rutland@arm.com, martin.petersen@oracle.com, schwidefsky@de.ibm.com, willy@infradead.org, mst@redhat.com, mhocko@suse.com, monstr@monstr.eu, pmladek@suse.com, cai@lca.pw, rdunlap@infradead.org, robin.murphy@arm.com, sergey.senozhatsky@gmail.com, rostedt@goodmis.org, tiwai@suse.com, tytso@mit.edu, tglx@linutronix.de, gor@linux.ibm.com, wsa@the-dreams.de 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: We assume an uninitialized value couldn't come from stackdepot, so we don't track stackdepot allocations with KMSAN. Signed-off-by: Alexander Potapenko Cc: Andrey Ryabinin Cc: Jens Axboe Cc: Andy Lutomirski Cc: Vegard Nossum Cc: Dmitry Vyukov Cc: Marco Elver Cc: Andrey Konovalov Cc: Christoph Hellwig Cc: linux-mm@kvack.org --- v4: - set __GFP_NO_KMSAN_SHADOW explicitly for allocations Change-Id: Ic3ec9b3dff3fff2732d874508a3582fb26ff0b1f --- lib/stackdepot.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/lib/stackdepot.c b/lib/stackdepot.c index 195ce3dc7c37e..ba584910ad66b 100644 --- a/lib/stackdepot.c +++ b/lib/stackdepot.c @@ -297,7 +297,7 @@ depot_stack_handle_t stack_depot_save(unsigned long *entries, */ alloc_flags &= ~GFP_ZONEMASK; alloc_flags &= (GFP_ATOMIC | GFP_KERNEL); - alloc_flags |= __GFP_NOWARN; + alloc_flags |= (__GFP_NOWARN | __GFP_NO_KMSAN_SHADOW); page = alloc_pages(alloc_flags, STACK_ALLOC_ORDER); if (page) prealloc = page_address(page); -- 2.25.1.696.g5e7596f4ac-goog