Re: mmap denywrite mess (Was: [GIT PULL] overlayfs fixes for 5.14-rc6)

[David Hildenbrand]

On 11.08.21 18:20, Linus Torvalds wrote:
> On Wed, Aug 11, 2021 at 4:45 AM David Hildenbrand <david@xxxxxxxxxx> wrote:
> > I proposed a while ago to get rid of VM_DENYWRITE completely:
> >
> > https://lkml.kernel.org/r/20210423131640.20080-1-david@xxxxxxxxxx
> >
> > I haven't looked how much it still applies to current upstream, but
> > maybe that might help cleaning up that code.
>
> I like it.
>
> I agree that we could - and probably should - just do it this way.
>
> We don't expose MAP_DENYWRITE to user space any more - and the old
> legacy library loading code certainly isn't worth it - and so
> effectively the only way to set it is with execve().
>
> And yes, it gets rid of all the silly games with the per-mapping flags.

I'll rebase, retest and resend, putting you on cc. Then we can discuss 
if/how/when we might want to go that path.

--
Thanks,

David / dhildenb