From: Tejun Heo <tj@kernel.org>
To: Pavel Emelyanov <xemul@parallels.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Cyrill Gorcunov <gorcunov@gmail.com>,
"Kirill A. Shutemov" <kirill@shutemov.name>,
Vasiliy Kulikov <segoon@openwall.com>,
"containers@lists.osdl.org" <containers@lists.osdl.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
Nathan Lynch <ntl@pobox.com>, Oren Laadan <orenl@cs.columbia.edu>,
Daniel Lezcano <dlezcano@fr.ibm.com>,
Glauber Costa <glommer@parallels.com>,
James Bottomley <jbottomley@parallels.com>,
Alexey Dobriyan <adobriyan@gmail.com>,
Al Viro <viro@ZenIV.linux.org.uk>
Subject: Re: [patch 2/2] fs, proc: Introduce the /proc/<pid>/map_files/ directory v6
Date: Fri, 2 Sep 2011 02:13:55 +0900 [thread overview]
Message-ID: <20110901171355.GC2752@htj.dyndns.org> (raw)
In-Reply-To: <4E5F7702.2070808@parallels.com>
Hello,
On Thu, Sep 01, 2011 at 04:13:54PM +0400, Pavel Emelyanov wrote:
> Because with the handler restore process looks very natural and simple - each
> task does the following steps
>
> 1. restore task resources (open files, set IDs, restore connections, wire back timers, etc.)
> 2. call execve() to jump into new memory+registers context which is
> a. unmap all the user memory
> b. map required mappings
> c. populate them with data
> d. restore registers
> e. restore IP
But what about multiple threads? exec is already scary enough as it
is and I don't think it would be wise to overload it for this.
I don't really think binfmt handler would be able to achieve
completeness without ending up with full de-serializer in kernel.
There are a lot of states which already have API to manipulate from
the userland thread itself and they all will need to be replicated in
the binfmt handler. It really has to be full de-serializer if it
wants to function like you described.
And if we're gonna have interventions anyway, I can't see much point
in implementing something which seems simpler - it's not gonna be
actually simpler.
Thanks.
--
tejun
next prev parent reply other threads:[~2011-09-01 17:14 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-31 7:58 [patch 0/2] Introduce /proc/pid/map_files v6 Cyrill Gorcunov
2011-08-31 7:58 ` [patch 1/2] fs, proc: Make proc_get_link to use dentry instead of inode Cyrill Gorcunov
2011-08-31 7:58 ` [patch 2/2] fs, proc: Introduce the /proc/<pid>/map_files/ directory v6 Cyrill Gorcunov
2011-08-31 9:06 ` Vasiliy Kulikov
2011-08-31 10:12 ` Cyrill Gorcunov
2011-08-31 11:26 ` Cyrill Gorcunov
2011-08-31 14:04 ` Kirill A. Shutemov
2011-08-31 14:09 ` Cyrill Gorcunov
2011-08-31 14:26 ` Cyrill Gorcunov
2011-08-31 22:10 ` Andrew Morton
2011-09-01 3:07 ` Kyle Moffett
2011-09-01 7:58 ` Pavel Emelyanov
2011-09-01 11:50 ` Tejun Heo
2011-09-01 12:13 ` Pavel Emelyanov
2011-09-01 17:13 ` Tejun Heo [this message]
2011-09-02 19:15 ` Matt Helsley
2011-09-02 0:09 ` Matt Helsley
2011-09-01 8:05 ` Cyrill Gorcunov
2011-09-02 16:37 ` Vasiliy Kulikov
2011-09-05 18:53 ` Vasiliy Kulikov
2011-09-05 19:20 ` Cyrill Gorcunov
2011-09-05 19:49 ` Vasiliy Kulikov
2011-09-05 20:36 ` Cyrill Gorcunov
2011-09-06 10:15 ` Vasiliy Kulikov
2011-09-06 16:51 ` Tejun Heo
2011-09-06 17:29 ` Vasiliy Kulikov
2011-09-06 17:33 ` Tejun Heo
2011-09-06 18:15 ` Cyrill Gorcunov
[not found] ` <20110906173341.GM18425-9pTldWuhBndy/B6EtB590w@public.gmane.org>
2011-09-07 11:23 ` Vasiliy Kulikov
2011-09-07 21:53 ` Cyrill Gorcunov
2011-09-07 22:13 ` Andrew Morton
2011-09-07 22:42 ` Cyrill Gorcunov
2011-09-07 22:53 ` Andrew Morton
2011-09-08 5:48 ` Cyrill Gorcunov
2011-09-08 5:50 ` Cyrill Gorcunov
2011-09-08 6:04 ` Cyrill Gorcunov
2011-09-08 23:52 ` Andrew Morton
2011-09-09 0:24 ` Pavel Emelyanov
2011-09-09 5:48 ` Cyrill Gorcunov
2011-09-09 6:00 ` Andrew Morton
2011-09-09 6:22 ` Cyrill Gorcunov
2011-09-10 13:21 ` [kernel-hardening] " Vasiliy Kulikov
2011-09-10 13:49 ` Cyrill Gorcunov
2011-09-01 10:46 ` Cyrill Gorcunov
2011-09-01 22:49 ` Andrew Morton
2011-09-01 23:04 ` Tejun Heo
2011-09-02 5:54 ` Cyrill Gorcunov
2011-09-02 5:53 ` Cyrill Gorcunov
2011-08-31 22:50 ` Andrew Morton
2011-09-02 1:54 ` Nicholas Miell
2011-09-02 1:58 ` Tejun Heo
2011-09-02 2:04 ` Nicholas Miell
2011-09-02 2:29 ` Tejun Heo
2011-09-02 8:07 ` Kirill A. Shutemov
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