tree bd5261ac8d40d05eaf706424c7c9174eda45275a
parent a96099e13068278e54afa637c088496d56c85b62
author Evgenii Stepanov <eugenis@google.com> 1594770297 -0700
committer Evgenii Stepanov <eugenis@google.com> 1594933040 -0700

Pagetable-friendly shared library address randomization.

Add inaccessible gaps between shared libraries to make it harder for the
attackers to defeat ASLR by random probing.

To avoid excessive page table bloat, only do this when a library is
about to cross a huge page boundary, effectively allowing several
smaller libraries to be lumped together.

Bug: 158113540
Test: look at /proc/$$/maps
Change-Id: I39c0100b81f72447e8b3c6faafa561111492bf8c