| Bug ID | 1059075 |
|---|---|
| Summary | -fstack-clash-protection writes beyond array bounds |
| Classification | openSUSE |
| Product | openSUSE Tumbleweed |
| Version | Current |
| Hardware | Other |
| OS | Other |
| Status | NEW |
| Severity | Normal |
| Priority | P5 - None |
| Component | Basesystem |
| Assignee | rguenther@suse.com |
| Reporter | schwab@suse.com |
| QA Contact | qa-bugs@suse.de |
| Found By | --- |
| Blocker | --- |
When allocating a zero-length array with alloca or as a VLA the code produced by -fstack-clash-protection accesses the array beyond bounds. The failure can best be seen on armv7 (or targets without their own probe_stack insn) where a stack probe is destructive, and where it breaks glibc. https://build.opensuse.org/package/live_build_log/Base:System/glibc/openSUSE_Factory_ARM/armv7l