================
@@ -2762,18 +2757,17 @@ int UnwindCursor<A,
R>::stepThroughSigReturn(Registers_arm64 &) {
template <typename A, typename R>
bool UnwindCursor<A, R>::setInfoForSigReturn(Registers_riscv &) {
const pint_t pc = static_cast<pint_t>(getReg(UNW_REG_IP));
- uint32_t instructions[2];
- struct iovec local_iov = {&instructions, sizeof instructions};
- struct iovec remote_iov = {reinterpret_cast<void *>(pc), sizeof
instructions};
- long bytesRead =
- syscall(SYS_process_vm_readv, getpid(), &local_iov, 1, &remote_iov, 1,
0);
+ // The PC might contain an invalid address if the unwind info is bad, so
+ // directly accessing it could cause a SIGSEGV.
+ if (!isReadableAddr(pc) || !isReadableAddr(pc + 4))
----------------
ajordanr-google wrote:
Given Paul's offline comments, I've removed the alignment as it seems to be a
bug in QEMU not Linux.
https://github.com/llvm/llvm-project/pull/74791
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