https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94514
--- Comment #4 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The releases/gcc-8 branch has been updated by Szabolcs Nagy <n...@gcc.gnu.org>: https://gcc.gnu.org/g:d523cd5109bc5ab42edf85385f6a1085e0d6028c commit r8-10252-gd523cd5109bc5ab42edf85385f6a1085e0d6028c Author: Szabolcs Nagy <szabolcs.n...@arm.com> Date: Fri Apr 3 09:35:41 2020 +0000 aarch64, libgcc: Fix unwinding from pac-ret to normal frames [PR94514] With -mbranch-protection=pac-ret the debug info toggles the signedness state of the return address so the unwinder knows when the return address needs pointer authentication. The unwind context flags were not updated according to the dwarf frame info. This causes unwinding across frames that were built without pac-ret to incorrectly authenticate the return address wich corrupts the return address on a system where PAuth is enabled. Note: This even affects systems where all code use pac-ret because unwinding across a signal frame the return address is not signed. Changed branch-protection=pac-ret to sign-return-address=all etc in the tests for the backport. gcc/testsuite/ChangeLog: Backport from mainline. 2020-04-23 Szabolcs Nagy <szabolcs.n...@arm.com> PR target/94514 * g++.target/aarch64/pr94514.C: Require lp64. * gcc.target/aarch64/pr94514.c: Likewise. Backport from mainline. 2020-04-21 Szabolcs Nagy <szabolcs.n...@arm.com> PR target/94514 * g++.target/aarch64/pr94514.C: New test. * gcc.target/aarch64/pr94514.c: New test. libgcc/ChangeLog: Backport from mainline. 2020-04-21 Szabolcs Nagy <szabolcs.n...@arm.com> PR target/94514 * config/aarch64/aarch64-unwind.h (aarch64_frob_update_context): Update context->flags accroding to the frame state.
