[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <20090506232703.GA3036@sequoia.sous-sol.org>
Date: Wed, 6 May 2009 16:27:03 -0700
From: Chris Wright <chrisw@...s-sol.org>
To: Oleg Nesterov <oleg@...hat.com>
Cc: Chris Wright <chrisw@...s-sol.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Roland McGrath <roland@...hat.com>,
linux-kernel@...r.kernel.org, James Morris <jmorris@...ei.org>
Subject: Re: [PATCH 3/3] ptrace: do not use task_lock() for attach
* Oleg Nesterov (oleg@...hat.com) wrote:
> But this can happen without this change too?
>
> - cpu2 takes task_lock(), tracehook_tracer_task() returns NULL because
> we are not traced yet.
>
> - cpu1 does ptrace_attach() and succeds, because cpu2 didn't update sid
> yet
>
> - cpu2 continues, it doesn't check avc_has_perm() (tracer == 0) and
> updates sid.
>
> No?
Yes.
> Shouldn't selinux_setprocattr() take ->cred_exec_mutex, like we do in
> selinux_bprm_set_creds() path?
I was looking at the same, seems like it to me. James?
thanks,
-chris
>
> Oleg.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists