tree a0bfda07e793e34538a7a0680bfaed1ae62814cb
parent 342c95721fa3e17c205e1735693046e4cd05674b
author dcashman <dcashman@google.com> 1451431693 -0800
committer Kees Cook <keescook@google.com> 1458856921 -0700

BACKPORT: FROMLIST: arm64: mm: support ARCH_MMAP_RND_BITS.

(cherry picked from commit https://lkml.org/lkml/2015/12/21/340)

arm64: arch_mmap_rnd() uses STACK_RND_MASK to generate the
random offset for the mmap base address.  This value represents a
compromise between increased ASLR effectiveness and avoiding
address-space fragmentation. Replace it with a Kconfig option, which
is sensibly bounded, so that platform developers may choose where to
place this compromise. Keep default values as new minimums.

Signed-off-by: Daniel Cashman <dcashman@android.com>
Signed-off-by: Daniel Cashman <dcashman@google.com>

Bug: 27796957
Patchset: ASLR sysctl

Change-Id: Ic81409f45c8025c63419558df8b43ec9ec478082
Signed-off-by: Kees Cook <keescook@google.com>