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Peter Anvin" , Namhyung Kim , Andrii Nakryiko , Kees Cook , Sam James Subject: [RFC PATCH v1 12/25] unwind_user/eh_frame: Remove .eh_frame[_hdr] section on detected corruption Date: Tue, 18 Aug 2026 16:49:41 +0200 Message-ID: <20260818144954.2320378-13-jremus@linux.ibm.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260818144954.2320378-1-jremus@linux.ibm.com> References: <20260818144954.2320378-1-jremus@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-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-GUID: der1r54IzDIcCZZ2V4d6xZ3mG-8Gga8K X-Authority-Analysis: v=2.4 cv=NLLlPU6g c=1 sm=1 tr=0 ts=6a84711e cx=c_pps a=bLidbwmWQ0KltjZqbj+ezA==:117 a=bLidbwmWQ0KltjZqbj+ezA==:17 a=Sv0fKeRqtYgA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=U7nrCbtTmkRpXpFmAIza:22 a=VnNF1IyMAAAA:8 a=sOSzolwKFyyup9Hw6m8A:9 X-Proofpoint-Spam-Info: AW1haW4tMjYwODE4MDEwNyBTYWx0ZWRfX2REDRasiGSI+ b2CWYTfUT2QE2BH4zvYpcjbT57m2gOai8IfbVprBf5h54ejJ+KstLZUaMm0Qd7k7MFAAzN9dpuk x/i3/wNW4YI6494glQOTLmDFedbRKpk= X-Proofpoint-ORIG-GUID: WesP5HBmGJMvL8wanLE9UTqFywAvJrON X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODE4MDEwNyBTYWx0ZWRfXzZpoiAI9FLve zFD8Ca4Odz6KO7HLaiRs98xdC+7fpXXn/FbFIMfNzemPnAPZAzRoKW53XRxFaN8XI/mRiESCP7v gg3BQRrAl0E0iQG67Rq3PepqYVXMMRUPcSEUlPoJEWwb3vwJO6FBItBaGJMYkiBkdPUUoG8PcRZ +98t0TpLe1fXqBxGIlOW1+ezbN81k9AcYbk2OY0fVOMTHaG63dNuF5VAIr5qJfAapeCdet0gIxS M6UdPuDlsaSO/yQUca5u5Tsla1SmFtBc5Tp3B5+AUcZeniEWxu8qgSv3LgHYsXxjmNbFT2xwsPw zAHWFPGtdxbnUkE2ty6hkB3JucYeqp7prQLy9t4NxnXpeHZAbxn5tq1pkXxpjfpJIwjjf3VsCEt YU89ESZzWaW5vYLessLGz7QCbV0Uk2AOUiKOWGYFzq50rWx7XXCa+A4l4YM8nad6XpWi3A5k5yW ycKedISrcjYtGC55WjQ== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-08-18_02,2026-08-18_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 spamscore=0 lowpriorityscore=0 phishscore=0 impostorscore=0 malwarescore=0 suspectscore=0 clxscore=1015 adultscore=0 priorityscore=1501 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608180107 To avoid continued attempted use of a bad .eh_frame[_hdr] sections, remove them on demand when the first sign of corruption is detected. Based on Josh Poimboeuf's, Steven Rostedt's, and my unwind user sframe implementation. Signed-off-by: Jens Remus --- kernel/unwind/eh_frame.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/kernel/unwind/eh_frame.c b/kernel/unwind/eh_frame.c index 5ef8fef06a80..7657291324c0 100644 --- a/kernel/unwind/eh_frame.c +++ b/kernel/unwind/eh_frame.c @@ -1149,6 +1149,15 @@ int eh_frame_find(unsigned long ip, struct unwind_user_frame *frame) if (!ret) ret = __find_frame_row(sec, &fde, ip, frame); + /* + * Unregister .eh_frame[_hdr] in case of an error, + * e.g. EINVAL (corrupted) or EFAULT (inaccessible). + * Keep if ENOENT (not found) or EOPNOTSUPP (unsupported CFI). + */ + if (ret && (ret != -ENOENT && ret != -EOPNOTSUPP)) + if (eh_frame_remove_section(sec->eh_frame_hdr_start)) + dbg("eh_frame_remove_section() failed\n"); + return ret; } -- 2.53.0