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Thu, 18 Sep 2025 07:48:08 -0700 (PDT) Message-ID: <9f332ea7-4210-42f8-b640-3135cdd808be@gmail.com> Date: Thu, 18 Sep 2025 16:48:05 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v8 2/2] kasan: apply write-only mode in kasan kunit testcases To: Yeoreum Yun , glider@google.com, andreyknvl@gmail.com, dvyukov@google.com, vincenzo.frascino@arm.com, corbet@lwn.net, catalin.marinas@arm.com, will@kernel.org, akpm@linux-foundation.org, scott@os.amperecomputing.com, jhubbard@nvidia.com, pankaj.gupta@amd.com, leitao@debian.org, kaleshsingh@google.com, maz@kernel.org, broonie@kernel.org, oliver.upton@linux.dev, james.morse@arm.com, ardb@kernel.org, hardevsinh.palaniya@siliconsignals.io, david@redhat.com, yang@os.amperecomputing.com Cc: kasan-dev@googlegroups.com, workflows@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org References: <20250916222755.466009-1-yeoreum.yun@arm.com> <20250916222755.466009-3-yeoreum.yun@arm.com> Content-Language: en-US From: Andrey Ryabinin In-Reply-To: <20250916222755.466009-3-yeoreum.yun@arm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 9/17/25 12:27 AM, Yeoreum Yun wrote: > When KASAN is configured in write-only mode, > fetch/load operations do not trigger tag check faults. > > As a result, the outcome of some test cases may differ > compared to when KASAN is configured without write-only mode. > > Therefore, by modifying pre-exist testcases > check the write only makes tag check fault (TCF) where > writing is perform in "allocated memory" but tag is invalid > (i.e) redzone write in atomic_set() testcases. > Otherwise check the invalid fetch/read doesn't generate TCF. > > Also, skip some testcases affected by initial value > (i.e) atomic_cmpxchg() testcase maybe successd if > it passes valid atomic_t address and invalid oldaval address. > In this case, if invalid atomic_t doesn't have the same oldval, > it won't trigger write operation so the test will pass. > > Signed-off-by: Yeoreum Yun > Reviewed-by: Andrey Konovalov > --- Reviewed-by: Andrey Ryabinin