Re: [PATCH v2 02/17] mm: Exempt special mappings from mlock(), mprotect() and madvise()

[Andy Lutomirski]

On Thu, Dec 14, 2017 at 3:27 AM, Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:
> It makes no sense to ever prod at special mappings with any of these
> syscalls.
>
> XXX should we include munmap() ?

This is an ABI break for the vdso.  Maybe that's okay, but mremap() on
the vdso is certainly used, and I can imagine debuggers using
mprotect().