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