linux-kernel - Re: [PATCH] proc: Fix the threaded /proc/self.

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Message-ID: <20071120230306.GE24380@elte.hu>
Date:	Wed, 21 Nov 2007 00:03:06 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Pavel Emelyanov <xemul@...nvz.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Pavel Machek <pavel@....cz>,
	kernel list <linux-kernel@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH] proc: Fix the threaded /proc/self.


* Eric W. Biederman <ebiederm@...ssion.com> wrote:

> We may be stuck with the current broken behavior for backwards 
> compatibility reasons but lets try fixing our ancient bug for the 
> 2.6.25 time frame and see if anyone screams.

to make sure i got you right - do you agree that this is a regression 
and that we need the patch below included in 2.6.24?

> Signed-off-by: Eric W. Biederman <ebiederm@...ssion.com>

Acked-by: Ingo Molnar <mingo@...e.hu>

> ---
>  fs/proc/base.c |   12 ++++++------
>  1 files changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/fs/proc/base.c b/fs/proc/base.c
> index 34a1821..8502436 100644
> --- a/fs/proc/base.c
> +++ b/fs/proc/base.c
> @@ -2050,22 +2050,22 @@ static int proc_self_readlink(struct dentry *dentry, char __user *buffer,
>  			      int buflen)
>  {
>  	struct pid_namespace *ns = dentry->d_sb->s_fs_info;
> -	pid_t tgid = task_tgid_nr_ns(current, ns);
> +	pid_t pid = task_pid_nr_ns(current, ns);
>  	char tmp[PROC_NUMBUF];
> -	if (!tgid)
> +	if (!pid)
>  		return -ENOENT;
> -	sprintf(tmp, "%d", tgid);
> +	sprintf(tmp, "%d", pid);
>  	return vfs_readlink(dentry,buffer,buflen,tmp);
>  }
>  
>  static void *proc_self_follow_link(struct dentry *dentry, struct nameidata *nd)
>  {
>  	struct pid_namespace *ns = dentry->d_sb->s_fs_info;
> -	pid_t tgid = task_tgid_nr_ns(current, ns);
> +	pid_t pid = task_pid_nr_ns(current, ns);
>  	char tmp[PROC_NUMBUF];
> -	if (!tgid)
> +	if (!pid)
>  		return ERR_PTR(-ENOENT);
> -	sprintf(tmp, "%d", task_tgid_nr_ns(current, ns));
> +	sprintf(tmp, "%d", pid);
>  	return ERR_PTR(vfs_follow_link(nd,tmp));
>  }
>  
> -- 
> 1.5.3.rc6.17.g1911

	Ingo
-
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