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Long" , Masami Hiramatsu , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH -next] arm64/ptrace: Fix stack-out-of-bounds read in regs_get_kernel_stack_nth() Message-ID: <20250613150435.26153B5d-hca@linux.ibm.com> References: <20250604005533.1278992-1-wutengda@huaweicloud.com> <20250612163331.GA13384@willie-the-truck> 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=us-ascii Content-Disposition: inline In-Reply-To: <20250612163331.GA13384@willie-the-truck> X-TM-AS-GCONF: 00 X-Authority-Analysis: v=2.4 cv=Y4X4sgeN c=1 sm=1 tr=0 ts=684c3e08 cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=kj9zAlcOel0A:10 a=6IFa9wvqVegA:10 a=7XB3cJai-94OTXmGs3EA:9 a=CjuIK1q_8ugA:10 X-Proofpoint-GUID: uwSIkbTXw9knD9U00yLIga3sZ76sILCJ X-Proofpoint-ORIG-GUID: uwSIkbTXw9knD9U00yLIga3sZ76sILCJ X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwNjEzMDEwNyBTYWx0ZWRfX0DEYwy1xF1tK rzsFKtB1UXWYoQiamn4W1/RqmeNO/QlD1ORGeZrZkvEbSfUSte1MlAfQF1LqTVA5xYkT77hj3lA 3tRQGtTE5tTuD37x8Hjuc99UK+WdaDtuiIAeuWEMUGiiV4YAdpKh9lco/vDrRaV6q1jXRop5CKK y2FGB1xY+e+FspHfHxamopWFIr6IptP4az/RLd0iMgHM+bOo1dX6bFIhmZMZHi9c56JEBnG6tJo lVLqkk1ab+Ur53kfYOr68IGWWODpktWs1obcRzQ0N7NcW1tWj8hPuyU2cqzoHlwcHOphAQ7aG9+ 9YfQlh9+Lqj1jvngXRGdqRtGHm3kwYHjsS9belae3ToB3vE5dCBTh3hx1LSc2gBaEMuZj11smIv zFrySB6YupbRZLLAmxIswv0N0sxM3VetXZoEEUfGhI39hvnQM1YIc5SjqEj+vz49WpytVgnq X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.0.736,FMLib:17.12.80.40 definitions=2025-06-13_01,2025-06-13_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxlogscore=603 spamscore=0 clxscore=1011 lowpriorityscore=0 malwarescore=0 bulkscore=0 adultscore=0 impostorscore=0 suspectscore=0 phishscore=0 mlxscore=0 priorityscore=1501 classifier=spam authscore=0 authtc=n/a authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2505280000 definitions=main-2506130107 On Thu, Jun 12, 2025 at 05:33:32PM +0100, Will Deacon wrote: > On Wed, Jun 04, 2025 at 12:55:33AM +0000, Tengda Wu wrote: > > diff --git a/arch/arm64/kernel/ptrace.c b/arch/arm64/kernel/ptrace.c > > index f79b0d5f71ac..fe3f7e554d14 100644 > > --- a/arch/arm64/kernel/ptrace.c > > +++ b/arch/arm64/kernel/ptrace.c > > @@ -141,7 +141,7 @@ unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n) > > > > addr += n; > > if (regs_within_kernel_stack(regs, (unsigned long)addr)) > > - return *addr; > > + return READ_ONCE_NOCHECK(addr); > > I think this should be '*addr', but that makes me wonder wtf s390 is > doing... That's obviously a brown paper bag bug in our code... will be fixed.