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| author | Szabolcs Nagy <szabolcs.nagy@arm.com> | 2020-04-15 17:40:45 +0100 |
|---|---|---|
| committer | Szabolcs Nagy <szabolcs.nagy@arm.com> | 2020-07-02 09:27:05 +0100 |
| commit | 09c1ff256bbfb8d21474e74ae3bd449239aa32c7 (patch) | |
| tree | 09d976310dd8c1be8323b0b14281931f67c18595 /sysdeps/unix/sysv/linux | |
| parent | a8014c48c1a2a0398e49b04a08962355c7dcbb11 (diff) | |
| download | glibc-09c1ff256bbfb8d21474e74ae3bd449239aa32c7.tar.gz glibc-09c1ff256bbfb8d21474e74ae3bd449239aa32c7.tar.xz glibc-09c1ff256bbfb8d21474e74ae3bd449239aa32c7.zip | |
aarch64: redefine RETURN_ADDRESS to strip PAC
RETURN_ADDRESS is used at several places in glibc to mean a valid code address of the call site, but with pac-ret it may contain a pointer authentication code (PAC), so its definition is adjusted. This is gcc PR target/94891: __builtin_return_address should not expose signed pointers to user code where it can cause ABI issues. In glibc RETURN_ADDRESS is only changed if it is built with pac-ret. There is no detection for the specific gcc issue because it is hard to test and the additional xpac does not cause problems.
Diffstat (limited to 'sysdeps/unix/sysv/linux')
0 files changed, 0 insertions, 0 deletions