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Wed, 28 Oct 2026 13:44:25 +0000 Date: Wed, 28 Oct 2026 21:49:09 +0800 From: Peng Fan To: Sudeep Holla Cc: linux-arm-kernel@lists.infradead.org, arm-scmi@vger.kernel.org, Cristian Marussi , Peng Fan , Sashiko Subject: Re: [PATCH 1/3] firmware: arm_scmi: imx: Track copied syslog words Message-ID: References: <20261028130502.2999676-1-sudeep.holla@kernel.org> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20261028130502.2999676-1-sudeep.holla@kernel.org> X-ClientProxiedBy: SI3PR02CA0003.apcprd02.prod.outlook.com (2603:1096:4:295::15) To AM8PR04MB7874.eurprd04.prod.outlook.com (2603:10a6:20b:24d::9) X-Archived-By: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: AM8PR04MB7874:EE_|AS4PR04MB9715:EE_ X-MS-Office365-Filtering-Correlation-Id: fa52b999-5e0a-4df0-cae2-08df34f99416 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|23010399003|19092799006|1800799024|376014|261022105027099003|261021121427099003|261009223027099003|261022075727099003|10067099003|56012099006|261026140227099003|6133799003|3023799007|18002099003|22082099003|11063799006; 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X-Spam-Score: 0.0 (/) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" X-Spam-Status: No, score=-8.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_EF,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 On Wed, Oct 28, 2026 at 01:05:00PM +0000, Sudeep Holla wrote: >The MISC syslog iterator records the number of returned words plus >firmware-reported remaining words in the caller's size output. > >The debugfs consumer uses that value to dump its fixed-size buffer. A >malformed or inconsistent response can therefore make it read beyond >the copied data and allocation. > >Return the accumulated number of words copied into the caller's buffer >instead. The generic iterator bounds this count to the initial buffer >capacity before processing each response. > >Reported-by: Sashiko >Closes: https://sashiko.dev/#/bug/linux-c3c9437c-ba1a-4db6-837f-cb0950d89018 This should be: https://sashiko.dev/#/bug/linux-67e325a9-473e-450a-a2a0-bf4c0c720624 >Fixes: 4fa62e80c7db ("firmware: arm_scmi: imx: Support getting syslog of MISC protocol") >Signed-off-by: Sudeep Holla Reviewed-by: Peng Fan