tree f9b3c5eea6b926cbd0f35f09e1aa88983c16a615
parent 6124c88f5dc2098c44108164b751cad2d6dd93d4
author Shoaib Meenai <smeenai@fb.com> 1653539952 -0700
committer Copybara-Service <copybara-worker@google.com> 1653582375 -0700

[libunwind] Use process_vm_readv to avoid potential segfaults

We've observed segfaults in libunwind when attempting to check for the
Linux aarch64 sigreturn frame, presumably because of bad unwind info
leading to an incorrect PC that we attempt to read from. Use
process_vm_readv to read the memory safely instead.

The s390x code path should likely follow suit, but I don't have the
hardware to be able to test that, so I didn't modify it here either.

Reviewed By: MaskRay, rprichard, #libunwind

Differential Revision: https://reviews.llvm.org/D126343

GitOrigin-RevId: 0be0a53df65cb402359c257922d80ab93d86fb40