Re: [PATCH v1] Arm64: ASLR: fix text randomization

From: Mark Rutland
Date: Thu Oct 09 2014 - 10:45:46 EST

On Wed, Oct 08, 2014 at 12:21:55PM +0100, Will Deacon wrote:
> On Wed, Oct 08, 2014 at 07:51:54AM +0100, Arun Chandran wrote:
> > On Tue, Oct 7, 2014 at 7:13 PM, Mark Rutland <mark.rutland@xxxxxxx> wrote:
> > > I wasn't able to spot where the randomness came from in the
> > > ARCH_BINFMT_ELF_RANDOMIZE_PIE case, so it's not clear to me if the
> > > generic implementation behaves identically other than disabling
> > > randomization when told to via proc.
> >
> > I also don't know from where it is coming; but it works on arm and x86 :)
> The randomness will come from elf_map, since that will descend into the mmap
> code and end up with a randomised base address (see mmap_base and
> arch_pick_mmap_layout).

Given that, it sounds like the existing randomize_et_dyn is redundant?

If so, the patch looks sane to me.

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