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Thu, 26 Mar 2026 09:43:16 +0000 Received: from smtpav06.fra02v.mail.ibm.com (smtpav06.fra02v.mail.ibm.com [10.20.54.105]) by smtprelay07.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 62Q9hCts51970526 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 26 Mar 2026 09:43:12 GMT Received: from smtpav06.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 59BB320049; Thu, 26 Mar 2026 09:43:12 +0000 (GMT) Received: from smtpav06.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id B3A6C20040; Thu, 26 Mar 2026 09:43:11 +0000 (GMT) Received: from [9.52.196.90] (unknown [9.52.196.90]) by smtpav06.fra02v.mail.ibm.com (Postfix) with ESMTPS; Thu, 26 Mar 2026 09:43:11 +0000 (GMT) Message-ID: Date: Thu, 26 Mar 2026 10:43:11 +0100 X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 09/12] s390/cio: use generic driver_override infrastructure To: Danilo Krummrich , Russell King , Greg Kroah-Hartman , "Rafael J. Wysocki" , Ioana Ciornei , Nipun Gupta , Nikhil Agarwal , "K. Y. Srinivasan" , Haiyang Zhang , Wei Liu , Dexuan Cui , Long Li , Bjorn Helgaas , Armin Wolf , Bjorn Andersson , Mathieu Poirier , Peter Oberparleiter , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , Harald Freudenberger , Holger Dengler , Mark Brown , "Michael S. Tsirkin" , Jason Wang , Xuan Zhuo , =?UTF-8?Q?Eugenio_P=C3=A9rez?= , Alex Williamson , Juergen Gross , Stefano Stabellini , Oleksandr Tyshchenko , "Christophe Leroy (CS GROUP)" Cc: linux-kernel@vger.kernel.org, driver-core@lists.linux.dev, linuxppc-dev@lists.ozlabs.org, linux-hyperv@vger.kernel.org, linux-pci@vger.kernel.org, platform-driver-x86@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-remoteproc@vger.kernel.org, linux-s390@vger.kernel.org, linux-spi@vger.kernel.org, virtualization@lists.linux.dev, kvm@vger.kernel.org, xen-devel@lists.xenproject.org, linux-arm-kernel@lists.infradead.org, Gui-Dong Han References: <20260324005919.2408620-1-dakr@kernel.org> <20260324005919.2408620-10-dakr@kernel.org> Content-Language: en-US From: Vineeth Vijayan In-Reply-To: <20260324005919.2408620-10-dakr@kernel.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-ORIG-GUID: lM9ihgFyzDaKKK4hT6xbAWnBu4HPvbko X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMzI2MDA2NyBTYWx0ZWRfX2in2v/sm6fVn 1EOEfnIWW9XHJhqTtN1dackcJvrGoIn6RYtzj2jaFpMYQNlaN3XxkuZ6dzpRGfvaZaU5moxAo8x trr+PwJfEqlepekJSKPo1fy9d5o6sgA5m683HkjOswpiKaLB0x2ZC2oGeSCAtUXbWtftJWxMU93 r9db17SA3IR04n61jqkqo5Bm6YDmBdYR4V4J415d1oOQfmhBzzcsrs5XSBy2lSc6eI3Yyn+zNJA fVQxRgkOI9yEBwUOLE+1Bp0urJ3SQpsL6Mxqh1jqv0YqiavIDSQ9i78PTJ+7C/RudgHS8T2aNad w9soTfL5Lep9UESaYSAmOjYsSO5EEkxvuZXANkgGYCQiRzjVScD+Gyn69Rf+vvAYsxJQFXrQuWu UQoghhH9HNEe1gD65ozDrx3Bl3HFNi5z9FxZxdctIbC0r4+GoaXzUaZ2fC0g/Uri9kPCKMvcMLh 7P5IIMyCHlQF+nN31cA== X-Authority-Analysis: v=2.4 cv=bLEb4f+Z c=1 sm=1 tr=0 ts=69c4ffb7 cx=c_pps a=3Bg1Hr4SwmMryq2xdFQyZA==:117 a=3Bg1Hr4SwmMryq2xdFQyZA==:17 a=IkcTkHD0fZMA:10 a=Yq5XynenixoA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=iQ6ETzBq9ecOQQE5vZCe:22 a=VwQbUJbxAAAA:8 a=pGLkceISAAAA:8 a=VnNF1IyMAAAA:8 a=rH2cy8X4UbemT2jZliAA:9 a=QEXdDO2ut3YA:10 X-Proofpoint-GUID: sWD6kkjX1ahK5tMWR5AN0EWZ8NVBfHg- X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-03-26_02,2026-03-24_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 adultscore=0 clxscore=1011 phishscore=0 impostorscore=0 malwarescore=0 lowpriorityscore=0 suspectscore=0 bulkscore=0 priorityscore=1501 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2603050001 definitions=main-2603260067 On 3/24/26 01:59, Danilo Krummrich wrote: > When a driver is probed through __driver_attach(), the bus' match() > callback is called without the device lock held, thus accessing the > driver_override field without a lock, which can cause a UAF. > > Fix this by using the driver-core driver_override infrastructure taking > care of proper locking internally. > > Note that calling match() from __driver_attach() without the device lock > held is intentional. [1] > > Link:https://lore.kernel.org/driver-core/DGRGTIRHA62X.3RY09D9SOK77P@kernel.org/ [1] > Reported-by: Gui-Dong Han > Closes:https://bugzilla.kernel.org/show_bug.cgi?id=220789 > Fixes: ebc3d1791503 ("s390/cio: introduce driver_override on the css bus") > Signed-off-by: Danilo Krummrich > --- Thank you Danilo. Reviewed-by: Vineeth Vijayan