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Fri, 19 Jun 2026 21:59:50 +0000 (GMT) Received: from Linuxdev (unknown [9.43.77.5]) by smtpav05.fra02v.mail.ibm.com (Postfix) with ESMTP; Fri, 19 Jun 2026 21:59:50 +0000 (GMT) From: Madhavan Srinivasan To: mpe@ellerman.id.au, npiggin@gmail.com, chleroy@kernel.org, sshegde@linux.ibm.com, ruanjinjie@huawei.com, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, "Mukesh Kumar Chaurasiya (IBM)" Cc: Sayali Patil Subject: Re: [PATCH V2] powerpc: Restore KUAP registers on syscall restart exit Date: Sat, 20 Jun 2026 03:29:32 +0530 Message-ID: <178190618810.653308.8397573315437375026.b4-ty@linux.ibm.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260615162617.2861795-1-mkchauras@gmail.com> References: <20260615162617.2861795-1-mkchauras@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-Spam-Info: AW1haW4tMjYwNjE5MDIxMCBTYWx0ZWRfX48h54EUw/YXo qNvZtuz4JJEewKr63gwOLFjblNr+5KUV04w2nSCko9CUAwxyNwJoRsS24wkpx37EJTd33eyd/hc Nw6qxf2K9gbYXkHTSrRl2TIqjQXIxA4= X-Proofpoint-ORIG-GUID: Fdq1AcOkCXB-mj6dlbtvvmKPY8XG0vNV X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNjE5MDIxMCBTYWx0ZWRfX0jvXVKXEaPea 53sn5CsvRJFmmEb9GxzcUU6VcBCmMeJtgPQuNYpiFqScb4qDojKJQ9IWcWufPre98yMaiyQwYx3 CLJK2TQncUb4Mi/S/uVLBlFAmr5pCdr4AwVIoYJlCTmcVW3UpguLH5wOm4UkozsOxNlGuaR60WO wI4MBTlEMPT9fmy0AItQkPLtp3icVefIwl85CCOLcml4PPxsg+yH+Seg3IfIrEK778D5LPuzqoe mFvisC107XoDy3+NHJc/UscwoZ6+rsCAsPDbDfXIzYnHt1fXODlZfpSnWDFGLOh/OLuqSQEvA0H ospP0iW8uhxPqqM5Bf6k75RL5pWgt8mt/xD7FJhKTW48o4uPi3+2zF01Zy3T2EwnUdXnoekTYZB 1VZPg5LbH1iQMwOUELinE2mGaaQx2RvvP07ZGli/vwyUGQ22VaKNzFNfUDDdS4oQ/bd8Vc0v1oW z5Ie7Glcnc9a5wk7dsg== X-Proofpoint-GUID: ciivoITSdYzBXRrE00jP1vks14oMbQHR X-Authority-Analysis: v=2.4 cv=L9gtheT8 c=1 sm=1 tr=0 ts=6a35bbdd cx=c_pps a=bLidbwmWQ0KltjZqbj+ezA==:117 a=bLidbwmWQ0KltjZqbj+ezA==:17 a=IkcTkHD0fZMA:10 a=FelO9ux0wxsA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=uAbxVGIbfxUO_5tXvNgY:22 a=VwQbUJbxAAAA:8 a=b1QI5ZhQ6AAWZPfWjeAA:9 a=QEXdDO2ut3YA:10 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.125,FMLib:17.12.100.49 definitions=2026-06-19_05,2026-06-18_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 impostorscore=0 malwarescore=0 clxscore=1011 adultscore=0 phishscore=0 lowpriorityscore=0 suspectscore=0 priorityscore=1501 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2606190210 On Mon, 15 Jun 2026 21:56:17 +0530, Mukesh Kumar Chaurasiya (IBM) wrote: > During a syscall restart, block KUAP so that pending interrupts can be > replayed. The original KUAP state is not restored before returning to > userspace, causing subsequent userspace accesses to fault and eventually > trigger bad_access_pkey(), crashing the kernel. > > The original KUAP register values are already saved in > arch_enter_from_user_mode(). Restore them on the syscall restart exit > path before returning to userspace. > > [...] Applied to powerpc/next. [1/1] powerpc: Restore KUAP registers on syscall restart exit https://git.kernel.org/powerpc/c/4e1187e12de40b5301977b2476d21b569358dafb cheers