Re: MAP_FIXED for ELF mappings

From: Linus Torvalds
Date: Wed Oct 04 2017 - 13:15:37 EST

On Wed, Oct 4, 2017 at 10:12 AM, Michal Hocko <mhocko@xxxxxxxxxx> wrote:
> Yes, but we already have a new stack mapped and that was the point of
> the referenced CVE where the binary segments got mapped over the stack

Well, if you control the binary to the point where you just make the
ELF section map on top of the stack, what's the problem?

I mean, it's not a security issue. You could just have written the
code to do mmap() instead.

So I think this is a "crazy users can do crazy things, we're not
arbiters of taste" thing.