Re: SPARC version of arch_validate_prot() looks broken (UAF read)

[Christoph Hellwig]

On Wed, Oct 07, 2020 at 02:45:39AM +0200, Jann Horn wrote:
> > I think arch_validate_prot() is still the right hook to validate the
> > protection bits. sparc_validate_prot() can iterate over VMAs with read
> > lock. This will, of course, require range as well to be passed to
> > arch_validate_prot().
> 
> In that case, do you want to implement this?

Any reason to not just call arch_validate_prot after taking the mmap
lock?