tree afbbcca1eaa59d40fa94db6babeb2ea909777357
parent b5c5646b5ffd3d451af5e8d52b50743bf61d4c40
author Jim_Guo <jim_guo@htc.com> 1398654717 +0800
committer Brian Carlstrom <bdc@google.com> 1407216472 -0700

ART: Fix memory unmapped twice issue in ElfFile::Load(bool)

Root Cause:
  The overlapped memory region will be unmapped by
  (1) ~MemMap() of reservation MemMap (reserve) and
  (2) ~MemMap() of "reuse" MemMap (segment).
  Someone takes the memory region after (1) and it will be unmapped in (2).
  So, SIGSEGV occurs when using the unmapped memory region.

Solution:
  Fixes this issue by skip unmap "reuse" MemMap in destructor.
  And always create reservation MemMap before "reuse" MemMap. (It also solved
  the fixupELF case which does not reserve the whole needed memory region).

Bug: 16486685
Change-Id: I8f2538861d5c3fa7b9a04d2c3f516319cc060291