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Peter Anvin" , Mathieu Desnoyers , Kees Cook , Sam James Cc: Jens Remus , bpf@vger.kernel.org, linux-mm@kvack.org, Namhyung Kim , Andrii Nakryiko , "Jose E. Marchesi" , Beau Belgrave , Florian Weimer , "Carlos O'Donell" , Masami Hiramatsu , Jiri Olsa , Arnaldo Carvalho de Melo , Andrew Morton , David Hildenbrand , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Heiko Carstens , Vasily Gorbik , Ilya Leoshkevich , "Steven Rostedt (Google)" Subject: [PATCH v16 10/20] unwind_user/sframe: Remove .sframe section on detected corruption Date: Thu, 21 May 2026 16:25:36 +0200 Message-ID: <20260521142546.3908498-11-jremus@linux.ibm.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260521142546.3908498-1-jremus@linux.ibm.com> References: <20260521142546.3908498-1-jremus@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNTIxMDE0MiBTYWx0ZWRfX5Cb9SNjh14zV CLa3w/v/zIcsC358NYpHV7oe41D+S35qEgs/fiIYo7k3IxWQQD3j+Nb56SExE/70gCmw6AIRrvK sBXLd3/Oup55nFRYOQ5rz9fEfCCds3b1+NSk6UXvwuPy/t5KO1qan2jOYXpc5yaBzxWBF7jmbl2 rit11+e4j8jSDSZAl5vVnldt5Q9yX5FvWZV+RW1vtQy5i72HrCtzlaf9XP1ESoKqbLUdWgq4r9g u/d7fPKXnGzDF+Ql3IgLdWCM1nD+qqMCCBTEkRrdOOHYQOeC1j/x/KQMjpRms2lWhKUVycAquqp 53XF2HZ3mtlMViozEINL9rG2nEuCrJt9OhZpC27FAsoqi8wUCyU9mkgGEl0kiwmHPUwvyZAz2m+ FPH1KwpW2IT2pOXJ/fXnkwC0Vy+uJtw2Z8AeTBWVCa+xRIjl7tV9ouqET1wLYvVIvMlUiVoREi+ zXY88qfywmdsoq07W5A== X-Proofpoint-GUID: Fx4VTBMqCayqEJuwq0j-4rAKT7n5LpoY X-Proofpoint-ORIG-GUID: Q54U5td7LPxOfnBGczdYla305bi7dNFy X-Authority-Analysis: v=2.4 cv=aYBRWxot c=1 sm=1 tr=0 ts=6a0f15f6 cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=NGcC8JguVDcA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=Y2IxJ9c9Rs8Kov3niI8_:22 a=VwQbUJbxAAAA:8 a=meVymXHHAAAA:8 a=pGLkceISAAAA:8 a=VnNF1IyMAAAA:8 a=yLRsOmMQGpVHI0ogWx0A:9 a=2JgSa4NbpEOStq-L5dxp:22 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=2026-05-21_02,2026-05-18_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 adultscore=0 bulkscore=0 suspectscore=0 lowpriorityscore=0 clxscore=1015 spamscore=0 phishscore=0 priorityscore=1501 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2605130000 definitions=main-2605210142 From: Josh Poimboeuf To avoid continued attempted use of a bad .sframe section, remove it on demand when the first sign of corruption is detected. Signed-off-by: Josh Poimboeuf Signed-off-by: Steven Rostedt (Google) Reviewed-by: Indu Bhagat Signed-off-by: Jens Remus --- Notes (jremus): Changes in v15: - sframe_find(): Align to normalized error code usage and remove .sframe for all but ENOENT. Also remove if user_read_access_begin() fails. kernel/unwind/sframe.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/kernel/unwind/sframe.c b/kernel/unwind/sframe.c index 41ece3ca62a1..e0eb2adf5a07 100644 --- a/kernel/unwind/sframe.c +++ b/kernel/unwind/sframe.c @@ -371,10 +371,15 @@ int sframe_find(unsigned long ip, struct unwind_user_frame *frame) ret = __find_fre(sec, &fde, ip, frame); } +end: + if (ret && ret != -ENOENT) + WARN_ON_ONCE(sframe_remove_section(sec->sframe_start)); + return ret; Efault: - return -EFAULT; + ret = -EFAULT; + goto end; } static void free_section(struct sframe_section *sec) -- 2.51.0