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

From: Will Deacon
Date: Wed Oct 08 2014 - 07:22:34 EST

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

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