tree 0174912bc771a3f7f7d2b38fadb1102193d470d8
parent 17f3b1bad76925c327a6572f6058b32651499d3c
author Colin Cross <ccross@android.com> 1461714692 -0700
committer Colin Cross <ccross@android.com> 1461968046 -0700

Handle segfaults while walking native heap

Vendor blobs on ryu mprotect heap pages, causing segfaults when dumping
unreachable memory.  Handle segfaults within HeapWalker by mapping a
zero page over any unreadable pages.  HeapWalker runs in the forked
process, so the mapping will not affect the original process.

Bug: 28269332
Change-Id: I16245af722123f2ad467cbc6f245a70666c55544
(cherry picked from commit ba5d9ff6d9674a0f1e985b49f53863045aff558d)