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

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Message-ID: <20100916193543.GA11016@redhat.com>
Date:	Thu, 16 Sep 2010 21:35:43 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Will Drewry <wad@...omium.org>
Cc:	linux-kernel@...r.kernel.org,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Roland McGrath <roland@...hat.com>,
	Neil Horman <nhorman@...driver.com>,
	Andi Kleen <andi@...stfloor.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	containers@...ts.linux-foundation.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH][RFC] fs/exec.c: provide the correct process pid to the
	pipe helper

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.

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