From: Al Viro <viro@ZenIV.linux.org.uk>
To: Sripathi Kodi <sripathik@in.ibm.com>
Cc: Linus Torvalds <torvalds@osdl.org>, Andrew Morton <akpm@osdl.org>,
linux-kernel@vger.kernel.org, patrics@interia.pl,
Ingo Molnar <mingo@elte.hu>, Roland McGrath <roland@redhat.com>
Subject: Re: [PATCH 2.6.13.1] Patch for invisible threads
Date: Tue, 13 Sep 2005 22:57:04 +0100 [thread overview]
Message-ID: <20050913215704.GV25261@ZenIV.linux.org.uk> (raw)
In-Reply-To: <43274503.7090303@in.ibm.com>
On Tue, Sep 13, 2005 at 04:30:43PM -0500, Sripathi Kodi wrote:
> Al Viro wrote:
> >
> >Well... If exposing the list of tasks in a group is OK, we can just leave
> >->permission NULL for that sucker. If it's not (and arguably it can be
> >sensitive information), we have a bigger problem - right now chroot
> >boundary
> >is the only control we have there; normally anyone can ls
> >/proc/<whatever>/task
> >and see other threads.
> >
>
> Al, I understand that we can't set ->permission to NULL as it removes the
> chroot boundary check. If I understood you correctly, we need to put
> additional checks in proc_permission to ensure anyone doing ls
> /proc/<pid>/task won't be able to see other threads.
Wrong. We need a separate function, _not_ modifying proc_permssion().
If we need ->permission() at all, that is - note that anyone can do
ls /proc/<pid>/task on other users' process.
next prev parent reply other threads:[~2005-09-13 21:57 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-09-12 17:46 [PATCH 2.6.13.1] Patch for invisible threads Sripathi Kodi
2005-09-12 20:49 ` Andrew Morton
2005-09-13 13:10 ` Sripathi Kodi
2005-09-13 14:53 ` Linus Torvalds
2005-09-13 16:51 ` Al Viro
2005-09-13 17:01 ` Linus Torvalds
2005-09-13 17:12 ` Al Viro
2005-09-13 21:30 ` Sripathi Kodi
2005-09-13 21:56 ` Roland McGrath
2005-09-13 21:57 ` Al Viro [this message]
2005-09-13 23:10 ` Linus Torvalds
2005-09-14 1:47 ` Sripathi Kodi
2005-09-14 1:52 ` Al Viro
2005-09-14 14:37 ` Bill Davidsen
2005-09-15 0:30 ` Sripathi Kodi
2005-09-14 1:50 ` Al Viro
2005-09-15 0:31 ` Sripathi Kodi
2005-09-15 0:55 ` Roland McGrath
2005-09-15 1:38 ` Sripathi Kodi
2005-09-15 2:12 ` Al Viro
2005-09-15 7:29 ` Roland McGrath
2005-09-15 1:18 ` Al Viro
2005-09-16 0:54 ` Sripathi Kodi
2005-09-16 7:46 ` Al Viro
2005-09-16 15:06 ` Sripathi Kodi
2005-09-16 18:05 ` Daniel Jacobowitz
2005-09-16 18:14 ` Al Viro
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