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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. gcc/testsuite/ChangeLog: PR target/94514 * g++.target/aarch64/pr94514.C: New test. * gcc.target/aarch64/pr94514.c: New test. libgcc/ChangeLog: PR target/94514 * config/aarch64/aarch64-unwind.h (aarch64_frob_update_context): Update context->flags accroding to the frame state.
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