powerpc: standardize mmap_rnd() usage
authorKees Cook <keescook@chromium.org>
Tue, 14 Apr 2015 22:47:54 +0000 (15:47 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Tue, 14 Apr 2015 23:49:05 +0000 (16:49 -0700)
commited6322746afb74c2509e2f3a6464182793b16eb9
tree0e1998c27632be0877cb01ea547f41611a7834b9
parent1f0569df0b0285e7ec2432d804a4921b06a61618
powerpc: standardize mmap_rnd() usage

In preparation for splitting out ET_DYN ASLR, this refactors the use of
mmap_rnd() to be used similarly to arm and x86.

(Can mmap ASLR be safely enabled in the legacy mmap case here?  Other
archs use "mm->mmap_base = TASK_UNMAPPED_BASE + random_factor".)

Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Ingo Molnar <mingo@kernel.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
arch/powerpc/mm/mmap.c