Re: [RFC][PATCH v2] procfs: Always expose /proc/<pid>/map_files/ and make it readable

[Andrew Morton]

On Tue, 27 Jan 2015 09:46:47 +0300 Cyrill Gorcunov <gorcunov@xxxxxxxxx> wrote:

> > There's one other problem here: we're assuming that the map_files
> > implementation doesn't have bugs.  If it does have bugs then relaxing
> > permissions like this will create new vulnerabilities.  And the
> > map_files implementation is surprisingly complex.  Is it bug-free?
> 
> I didn't find any bugs in map-files (and we use it for long time already)
> so I think it is safe.

You've been using map_files the way it was supposed to be used so no,
any bugs won't show up.  What happens if you don your evil black hat
and use map_files in ways that weren't anticipated?  Attack it?

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/