================
@@ -1845,8 +1986,14 @@ class _LIBUNWIND_HIDDEN Registers_arm64 {
uint64_t getSP() const { return _registers.__sp; }
void setSP(uint64_t value) { _registers.__sp = value; }
- uint64_t getIP() const { return _registers.__pc; }
- void setIP(uint64_t value) { _registers.__pc = value; }
+ uint64_t getIP() const { return authPC(&_registers, getDiscriminator()); }
+ void setIP(uint64_t value) {
+ // First authenticate the current value of the IP to ensure the context
----------------
DanielKristofKiss wrote:
unwinding starts from a context which is created by the `__unw_getcontext`.
Here the authentication ensure the context/registers are still pointing to a
legitimate address.
without this check any buffer could be used and setIP would just set the
arbitrary address and where the restore context would happily jump.
If the `value` is altered outside of libunwind then nothing to do here. Here I
assume rest of the application has no idea about PAC. With PAuthAbi this would
be different.
https://github.com/llvm/llvm-project/pull/113368
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