[RFC PATCH v1 12/25] unwind_user/eh_frame: Remove .eh_frame[_hdr] section on detected corruption
From: Jens Remus <hidden>
Date: 2026-08-18 14:50:30
Also in:
linux-s390, lkml
Subsystem:
the rest, userspace stack unwinding · Maintainers:
Linus Torvalds, Josh Poimboeuf, Steven Rostedt
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 <redacted> --- 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