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Fri, 8 May 2026 10:51:56 +0000 (GMT) Message-ID: <606aebad-d83f-4dd0-9316-9d6dad0cdcc0@linux.ibm.com> Date: Fri, 8 May 2026 12:51:55 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v14 12/19] unwind_user/sframe: Add .sframe validation option To: Steven Rostedt , Josh Poimboeuf , Indu Bhagat , Dylan Hatch Cc: bpf@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-trace-kernel@vger.kernel.org, x86@kernel.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)" , Peter Zijlstra , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" , Mathieu Desnoyers , Kees Cook , Sam James References: <20260505121718.3572346-1-jremus@linux.ibm.com> <20260505121718.3572346-13-jremus@linux.ibm.com> Content-Language: en-US From: Jens Remus Organization: IBM Deutschland Research & Development GmbH In-Reply-To: <20260505121718.3572346-13-jremus@linux.ibm.com> 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-Details-Enc: AW1haW4tMjYwNTA4MDExMCBTYWx0ZWRfX2auMkqKWq9zH Kavt7w6o+5VsedWe6iM0PPPzgQRh4KusiXlnezRf3zsYGS/AO1+pdCbi00e+jrqb4oj3eBWBvWV uFfuZ3QmH6iquylpROzws0b7SgAsixvbXKJl/2XoCsQMiOcBzDZ4Sfxopeqpyf3FK5r1zbVIaFc V2Jt/34vzxbCvyRZ9+2jxCD98J3PrUFo7OFtFzWy+CYPa8CMyJPgXylbL9E+lBhVIIta6svQ0LC zZ9yPoSYIXlPir2H6EWqLJEZ4w5y3FgP/k9xswkHo6EFD+A6jap6eGBvGKpzN8WkHGk5sRLVrgj 40MLKp7jdLJYQmD02rkYvUkAQOGfdq6sQ2AjAIggoA6O0/PCv9QccQEhZ2HdxYkMB7X6jb236Lo sI8TWIY/ZYOgDVFiWfn+1gk8reKmStmBnQFIiIPrVAs7sV8BeDV3MS5LYxM/hAKi9+BloqOHFOw MOtkDQlPIadYUtb9lFg== X-Proofpoint-GUID: MwWipGJ7KURaSVIuB_RtelIYOy5mE4YQ X-Proofpoint-ORIG-GUID: Ocagi59Tk5URWX8c5UV7KnL-pAuRJkoL X-Authority-Analysis: v=2.4 cv=eu/vCIpX c=1 sm=1 tr=0 ts=69fdc055 cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=IkcTkHD0fZMA:10 a=NGcC8JguVDcA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=iQ6ETzBq9ecOQQE5vZCe:22 a=VnNF1IyMAAAA:8 a=VwQbUJbxAAAA:8 a=LFt20mCCc4CE-LtB3JUA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 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=2026-05-07_02,2026-05-06_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 phishscore=0 lowpriorityscore=0 clxscore=1015 adultscore=0 suspectscore=0 malwarescore=0 bulkscore=0 impostorscore=0 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604200000 definitions=main-2605080110 X-Rspam-User: X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 8F0232000E X-Stat-Signature: 5qn5kqk51hi89g6o14zxaeojq7xdptc1 X-HE-Tag: 1778237552-312437 X-HE-Meta: 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 KkAT7Te2 DkOFynTw9SzssHpccwWGNSQzV7U7bWn7y9N4OKlrHldPrkKtfH7cNjnjLuejRatfFzyZUPMQGP2Wic6H18XXadxgMn54msUITYE1yUJE0aI3WTbZrTOZpWp/LkOomrUn+/Kf0BgEX8K6Ckl/DvIJBkGnMYUUIQzK5HT7q2WGFloJB9r/7hRgK6dPodZGRJ3cJbwYJSoPgDxwNkLF0XRSpxPvWVFDmlpf8IGT4jZ/3rsBBijWtGmtwWveQ2r4aQCD74Ahxlf2ZeyEyY6gzXyisMg+2GnOgLrOYMbu2lk7aOS5GXUeGt5ExUtWO2sagc6/LS6/GEfxC8B91sqTh5/Hjt8i7aE0QVdbQfdenupwsEAEedhDy9DjOdPSBqIA8bKn8z/dL Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 5/5/2026 2:17 PM, Jens Remus wrote: > From: Josh Poimboeuf > > Add a debug feature to validate all .sframe sections when first loading > the file rather than on demand. > > [ Jens Remus: Add support for SFrame V3. Add support for PC-relative > FDE function start offset. Adjust to rename of struct sframe_fre to > sframe_fre_internal. Use %#x/%#lx format specifiers. ] > diff --git a/kernel/unwind/sframe.c b/kernel/unwind/sframe.c > +static int safe_read_fde(struct sframe_section *sec, > + unsigned int fde_num, struct sframe_fde_internal *fde) > +{ > + int ret; > + > + if (!user_read_access_begin((void __user *)sec->sframe_start, > + sec->sframe_end - sec->sframe_start)) > + return -EFAULT; > + ret = __read_fde(sec, fde_num, fde); > + user_read_access_end(); > + return ret; > +} > +static int sframe_validate_section(struct sframe_section *sec) > +{ > + unsigned long prev_ip = 0; > + unsigned int i; > + > + for (i = 0; i < sec->num_fdes; i++) { > + struct sframe_fre_internal *fre, *prev_fre = NULL; > + unsigned long ip, fre_addr; > + struct sframe_fde_internal fde; > + struct sframe_fre_internal fres[2]; > + bool which = false; > + unsigned int j; > + int ret; > + > + ret = safe_read_fde(sec, i, &fde); Iterating over all FDEs may cause __read_fde() and thus safe_read_fde() to fail if one sframe section covers multiple text sections (regardless of whether it is also registered for multiple text sections), as __read_fde() checks whether the read FDE function start address is within [sec->text_start, sec->text_end[. See my related comments in my reply to [PATCH v14 05/19] unwind_user/ sframe: Add support for reading .sframe contents. > + if (ret) { > + dbg_sec("safe_read_fde(%u) failed\n", i); > + return ret; > + } > + Regards, Jens -- Jens Remus Linux on Z Development (D3303) jremus@de.ibm.com / jremus@linux.ibm.com IBM Deutschland Research & Development GmbH; Vorsitzender des Aufsichtsrats: Wolfgang Wendt; Geschäftsführung: David Faller; Sitz der Gesellschaft: Ehningen; Registergericht: Amtsgericht Stuttgart, HRB 243294 IBM Data Privacy Statement: https://www.ibm.com/privacy/