linux-kernel - Re: [PATCH][RFC] fs/exec.c: provide the correct process pid to the pipe helper

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Message-ID: <AANLkTinRNrmK_dm-3NEs9WpXOrZdG81QWHeJcU9XH3ot@mail.gmail.com>
Date:	Fri, 17 Sep 2010 09:52:03 -0500
From:	Will Drewry <wad@...omium.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	linux-kernel@...r.kernel.org,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Roland McGrath <roland@...hat.com>,
	Neil Horman <nhorman@...driver.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	containers@...ts.linux-foundation.org,
	linux-fsdevel@...r.kernel.org, Eugene Teo <eugene@...hat.com>
Subject: Re: [PATCH][RFC] fs/exec.c: provide the correct process pid to the
 pipe helper

On Fri, Sep 17, 2010 at 8:26 AM, Andi Kleen <andi@...stfloor.org> wrote:
> On Thu, 16 Sep 2010 13:59:59 -0500
> Will Drewry <wad@...omium.org> wrote:
>
>> format_corename uses task_tgid_vnr to provide the numeric pid of a
>> core-dumping process.  For file-based coredumps, this is perfectly
>> satisfactory.  However, when the core_pattern contains a pipe, the
>> substituted PID is invalid in the namespace of the core_pattern pipe
>> helper, the init namespace.
>
> Nasty problem. I wonder how many more similar problems name spaces
> have introduced.
>
> But wouldn't it be better to place the helper into the name space(s)
> of the executed process? I guess it would risk breaking some existing
> set ups, but it seem like the cleanest solution to me. If you want
> to move the core dump out of the name space you could still
> use a named pipe or something like that with someone outside listening.
>
> That would also fix the net namespace problem you mentioned

I agree.  This was what I did first, but I wasn't confident I'd done
it right.  I'll go ahead and post the two patches I used to accomplish
it.   I'm happy to spend some time polishing them until they are
functionally correct, if everyone is happy enough with the approach.

more to come,
will
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