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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.1 MIME-Version: 1.0 In-Reply-To: <1562335669-10127-1-git-send-email-alex.popov@linux.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 209.85.208.193 Subject: Re: [Qemu-devel] [QEMU-SECURITY] ide: fix assertion in ide_dma_cb() to prevent qemu DoS from quest X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: alex.popov@linux.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 05.07.2019 17:07, Alexander Popov wrote: > This assertion was introduced in the commit a718978ed58a in July 2015. > It implies that the size of successful DMA transfers handled in > ide_dma_cb() should be multiple of 512 (the size of a sector). > > But guest systems can initiate DMA transfers that don't fit this > requirement. Let's improve the assertion to prevent qemu DoS from quests. Hello! Just a friendly ping. Could you have a look at this patch? Best regards, Alexander