tree e3b382bc51c0cee843314304f8b68e492c32763b
parent 0b120ac0f95887bc81d9fee9beeda1addca009a3
author Petr Hosek <phosek@chromium.org> 1548299082 +0000
committer Petr Hosek <phosek@chromium.org> 1548299082 +0000

[libunwind] Don't abort if encoutering invalid .eh_frame_hdr

Recent Linux kernel release has introduced a bug as part of the ORC
rollout where the vDSO has a valid .eh_frame section, but it's missing
the .eh_frame_hdr section and GNU_EH_FRAME segment has zero size. This
causes libunwind to abort which breaks programs that use libunwind.

The other unwinder implementation (libgcc, non-gnu) instead silently
bail out unless being compiled as debug. This change modifies libunwind
to use the same strategy.

Differential Revision: https://reviews.llvm.org/D57081

git-svn-id: https://llvm.org/svn/llvm-project/libunwind/trunk@352016 91177308-0d34-0410-b5e6-96231b3b80d8