From: Cyrill Gorcunov <gorcunov@openvz.org>
To: Kees Cook <keescook@chromium.org>
Cc: LKML <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Oleg Nesterov <oleg@redhat.com>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
Pavel Emelyanov <xemul@parallels.com>, Tejun Heo <tj@kernel.org>,
Matt Helsley <matthltc@us.ibm.com>,
Andrew Vagin <avagin@openvz.org>, Pedro Alves <palves@redhat.com>
Subject: Re: [patch 2/2] c/r: prctl: Add ability to get clear_tid_address
Date: Mon, 19 Mar 2012 20:55:34 +0400 [thread overview]
Message-ID: <20120319165534.GI19594@moon> (raw)
In-Reply-To: <CAGXu5jJq5yQDadMpRasXNOV3=auRF5WbyyEf3bodf42veg9F0g@mail.gmail.com>
On Mon, Mar 19, 2012 at 09:51:36AM -0700, Kees Cook wrote:
> On Fri, Mar 16, 2012 at 1:55 PM, Cyrill Gorcunov <gorcunov@openvz.org> wrote:
> > Zero is written at clear_tid_address, when
> > the process exits. This functionality is used
> > by pthread_join().
> >
> > We already have sys_set_tid_address() to change this
> > address for current task but there is no way to obtain
> > it from a user space.
>
> Is it worth introducing a syscall for this just for symmetry? I
> suspect not, in which case:
>
> Acked-by: Kees Cook <keescook@chromium.org>
>
Thanks Kees! syscall was considered as "no-no" in previous
convesation about this patch, so we switched to prctl.
Cyrill
next prev parent reply other threads:[~2012-03-19 16:55 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-16 20:55 [patch 0/2] [PATCH 0/2] prctl extension in a sake of c/r Cyrill Gorcunov
2012-03-16 20:55 ` [patch 1/2] c/r: prctl: Add ability to set new mm_struct::exe_file Cyrill Gorcunov
2012-03-19 22:15 ` Andrew Morton
2012-03-19 22:39 ` Cyrill Gorcunov
2012-03-19 22:41 ` richard -rw- weinberger
2012-03-19 22:46 ` Andrew Morton
2012-03-19 22:50 ` Cyrill Gorcunov
2012-03-19 22:59 ` Andrew Morton
2012-03-19 23:12 ` Cyrill Gorcunov
2012-03-19 23:02 ` richard -rw- weinberger
2012-03-19 23:17 ` Cyrill Gorcunov
2012-03-19 23:23 ` richard -rw- weinberger
2012-03-20 6:55 ` Cyrill Gorcunov
2012-03-22 23:38 ` Eric W. Biederman
2012-03-23 6:41 ` Cyrill Gorcunov
2012-03-23 6:47 ` Cyrill Gorcunov
2012-03-23 17:06 ` Matt Helsley
2012-03-19 22:47 ` Cyrill Gorcunov
2012-03-16 20:55 ` [patch 2/2] c/r: prctl: Add ability to get clear_tid_address Cyrill Gorcunov
2012-03-19 16:51 ` Kees Cook
2012-03-19 16:55 ` Cyrill Gorcunov [this message]
-- strict thread matches above, loose matches on Subject: below --
2012-03-09 21:41 [patch 0/2] c/r update to prctl Cyrill Gorcunov
2012-03-09 21:41 ` [patch 2/2] c/r: prctl: Add ability to get clear_tid_address Cyrill Gorcunov
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