tree 44005f6f994f6b945112325fba827051d9c01660
parent bcc6d7a4ff98e2a22dc78bd30e7ea3a9a06e0a3e
author Fangrui Song <maskray@google.com> 1567614455 +0000
committer Petr Hosek <phosek@google.com> 1568071191 -0700

[ELF] Don't shrink RelrSection

Fixes PR43214.

The size of SHT_RELR may oscillate between 2 numbers (see D53003 for a
similar --pack-dyn-relocs=android issue). This can happen if the shrink
of SHT_RELR causes it to take more words to encode relocation offsets
(this can happen with thunks or segments with overlapping p_offset
ranges), and the expansion of SHT_RELR causes it to take fewer words to
encode relocation offsets.

To avoid the issue, add padding 1s to the end of the relocation section
if its size would decrease. Trailing 1s do not decode to more relocations.

Reviewed By: peter.smith

Differential Revision: https://reviews.llvm.org/D67164

llvm-svn: 370923