https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85334
H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |REOPENED
Resolution|FIXED |---
--- Comment #5 from H.J. Lu <hjl.tools at gmail dot com> ---
CET kernel has been changed to place a restore token on shadow stack
for signal handler to enhance security. It is usually transparent to
user programs since kernel will pop the restore token when signal
handler returns. But when an exception is thrown from a signal
handler, now we need to pop the the restore token. Otherwise, we get
FAIL: g++.dg/torture/pr85334.C -O0 execution test
FAIL: g++.dg/torture/pr85334.C -O1 execution test
FAIL: g++.dg/torture/pr85334.C -O2 execution test
FAIL: g++.dg/torture/pr85334.C -O3 -g execution test
FAIL: g++.dg/torture/pr85334.C -Os execution test
FAIL: g++.dg/torture/pr85334.C -O2 -flto -fno-use-linker-plugin
-flto-partition=none execution test
I am testing this patch:
diff --git a/libgcc/config/i386/shadow-stack-unwind.h
b/libgcc/config/i386/shadow-stack-unwind.h
index a32f3e74b52..40f48df2aec 100644
--- a/libgcc/config/i386/shadow-stack-unwind.h
+++ b/libgcc/config/i386/shadow-stack-unwind.h
@@ -49,8 +49,3 @@ see the files COPYING3 and COPYING.RUNTIME respectively. If
not, see
} \
} \
while (0)
-
-/* Increment frame count. Skip signal frames. */
-#undef _Unwind_Frames_Increment
-#define _Unwind_Frames_Increment(context, frames) \
- if (!_Unwind_IsSignalFrame (context)) frames++
