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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> | 2020-07-08 13:04:04 +0100 |
| commit | 0119a5f4785e77d21df99968a751b1bb65af9a9b (patch) | |
| tree | 95d07bd286814d5edade54ff3cb600c53830622e /sysdeps/nacl/bits | |
| parent | a8601c3f0da98f7179288be1a9a2950aad5b2f5f (diff) | |
| download | glibc-0119a5f4785e77d21df99968a751b1bb65af9a9b.tar glibc-0119a5f4785e77d21df99968a751b1bb65af9a9b.tar.gz glibc-0119a5f4785e77d21df99968a751b1bb65af9a9b.tar.bz2 glibc-0119a5f4785e77d21df99968a751b1bb65af9a9b.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.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Diffstat (limited to 'sysdeps/nacl/bits')
0 files changed, 0 insertions, 0 deletions