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[83.52.55.163]) by smtp.gmail.com with ESMTPSA id g6sm5604513wmq.14.2021.08.20.06.07.03 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 20 Aug 2021 06:07:04 -0700 (PDT) Subject: Re: [PATCH 0/1] uas: add stream number sanity checks (maybe 6.1) To: Peter Maydell , Gerd Hoffmann , Mauro Matteo Cascella References: <20210818120505.1258262-1-kraxel@redhat.com> From: =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= Message-ID: Date: Fri, 20 Aug 2021 15:07:03 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=philmd@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=170.10.133.124; envelope-from=philmd@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -49 X-Spam_score: -5.0 X-Spam_bar: ----- X-Spam_report: (-5.0 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.7, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, NICE_REPLY_A=-1.49, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action 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: , Cc: QEMU Developers Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Cc'ing Mauro to double-check. On 8/20/21 2:12 PM, Peter Maydell wrote: > On Wed, 18 Aug 2021 at 13:10, Gerd Hoffmann wrote: >> >> Security fix. Sorry for the last-minute patch, I had completely >> forgotten this one until the CVE number for it arrived today. >> >> Given that the classic usb storage device is way more popular than >> the uas (usb attached scsi) device the impact should be pretty low >> and we might consider to not screw up our release schedule for this. > > What's the impact if the bug is exploited ? Bug class: "guest-triggered user-after-free". Being privileged (root) in the guest, you can leak some data from the host process then DoS the host or potentially exploit the use-after-free to execute code on the host.