On Tue, Sep 06, 2005 at 06:57:37PM +0100, [email protected] wrote:
> On Tue, Sep 06, 2005 at 07:53:49PM +0200, Frank van Maarseveen wrote:
> > While I have access to /proc/<pid>, readlink fails with EACCES on
> >
> > /proc/<pid>/exe
> > /proc/<pid>/cwd
> > /proc/<pid>/root
> >
> > even when I own <pid> though it runs with a different effective/saved/fs
> > uid such as the X server. This is a bit uncomfortable and doesn't
> > seem right.
> >
> > Or is this to make /proc mounting inside a chroot jail safe?
>
> suid-root task does chdir() to place you shouldn't be able to access.
> You do cd /proc/<pid>/cwd and get there anyway. Bad Things Happen...
Ok, but being able to do readlink() does not mean that one can chdir(),
usually.
--
Frank
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