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Fri, 31 Jul 2026 03:41:48 -0700 (PDT) Received: from runnervmvrwv9.s0dhqrvhcoxedfv3gzip5zasqg.dx.internal.cloudapp.net ([172.185.54.254]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-3153e044912sm5379539eec.15.2026.07.31.03.41.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 31 Jul 2026 03:41:48 -0700 (PDT) From: linuxtestproject.agent@gmail.com To: Andrea Cervesato Date: Fri, 31 Jul 2026 10:41:47 +0000 Message-ID: <20260731104147.9091-1-linuxtestproject.agent@gmail.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260731-cve-2026-64600-v3-1-192da4ddf707@suse.com> References: <20260731-cve-2026-64600-v3-1-192da4ddf707@suse.com> MIME-Version: 1.0 X-Virus-Scanned: clamav-milter 1.0.9 at in-5.smtp.seeweb.it X-Virus-Status: Clean Subject: Re: [LTP] cve: reproducer for cve-2026-64600 X-BeenThere: ltp@lists.linux.it X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux Test Project List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: ltp@lists.linux.it Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: ltp-bounces+ltp=archiver.kernel.org@lists.linux.it Sender: "ltp" Hi Andrea, On Fri, 31 Jul 2026, Andrea Cervesato wrote: > cve: reproducer for cve-2026-64600 > while (!stop_pressure) { > SAFE_PWRITE(1, fd, wbuf, blksize, 0); > SAFE_FTRUNCATE(fd, 0); > SAFE_FSYNC(fd); > } Could the write be synced before the truncate? The truncate can discard the dirty page and delayed allocation before writeback, so fsync() only persists the empty file. This also differs from the documented write/fdatasync/truncate sequence and may leave the XFS log without the allocation pressure needed to widen the vulnerable window, causing false passes on affected kernels. Verdict - Needs revision --- Note: The agent can sometimes produce false positives although often its findings are genuine. If you find issues with the review, please comment this email or ignore the suggestions. Regards, LTP AI Reviewer -- Mailing list info: https://lists.linux.it/listinfo/ltp