From mboxrd@z Thu Jan  1 00:00:00 1970
From: Oleg Nesterov <oleg@redhat.com>
Subject: Re: [PATCH][RFC] fs/exec.c: provide the correct process pid to the
	pipe helper
Date: Thu, 16 Sep 2010 21:35:43 +0200
Message-ID: <20100916193543.GA11016@redhat.com>
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Cc: linux-kernel@vger.kernel.org,
	Alexander Viro <viro@zeniv.linux.org.uk>,
	Andrew Morton <akpm@linux-foundation.org>,
	KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
	Roland McGrath <roland@redhat.com>,
	Neil Horman <nhorman@tuxdriver.com>,
	Andi Kleen <andi@firstfloor.org>,
	"Eric W. Biederman" <ebiederm@xmission.com>,
	containers@lists.linux-foundation.org,
	linux-fsdevel@vger.kernel.org
To: Will Drewry <wad@chromium.org>
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On 09/16, Will Drewry wrote:
>
> --- a/fs/exec.c
> +++ b/fs/exec.c
> @@ -1467,6 +1467,13 @@ static int format_corename(char *corename, long signr)
>  	char *const out_end = corename + CORENAME_MAX_SIZE;
>  	int rc;
>  	int pid_in_pattern = 0;
> +	pid_t pid = task_tgid_vnr(current);
> +
> +	/* The pipe helper runs in the init namespace and should
> +	 * receive the matching pid until that changes.
> +	 */
> +	if (ispipe)
> +		pid = task_tgid_nr(current);

Agreed, it doesn't make sense to pass the "local" pid to the init ns.

Oleg.