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From: Kees Cook <keescook@chromium.org>
To: akpm@linux-foundation.org
Cc: Kees Cook <keescook@chromium.org>, linux-kernel@vger.kernel.org,
        Hector Marco-Gisbert <hecmargi@upv.es>, Ismael Ripoll <iripoll@upv.es>,
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Subject: [PATCH v3 0/10] split ET_DYN ASLR from mmap ASLR
Date: Tue,  3 Mar 2015 18:10:15 -0800
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To address the "offset2lib" ASLR weakness[1], this separates ET_DYN
ASLR from mmap ASLR, as already done on s390. The architectures
that are already randomizing mmap (arm, arm64, mips, powerpc, s390,
and x86), have their various forms of arch_mmap_rnd() made available
via the new CONFIG_ARCH_HAS_ELF_RANDOMIZE. For these architectures,
arch_randomize_brk() is collapsed as well.

This is an alternative to the solutions in:
https://lkml.org/lkml/2015/2/23/442

I've been able to test x86 and arm, and the buildbot (so far) seems
happy with building the rest.

Thanks!

-Kees

[1] http://cybersecurity.upv.es/attacks/offset2lib/offset2lib.html

v3:
- split change on a per-arch basis for easier review
- moved PF_RANDOMIZE check out of per-arch code (ingo)
v2:
- verbosified the commit logs, especially 4/5 (akpm)