linux-kernel - Re: [PATCH v2] proc: fix races against execve() of /proc/PID/fd**

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Message-ID: <20110828092520.GA8537@sun>
Date:	Sun, 28 Aug 2011 13:25:21 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Vasiliy Kulikov <segoon@...nwall.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	kernel-hardening@...ts.openwall.com,
	Al Viro <viro@...iv.linux.org.uk>,
	David Rientjes <rientjes@...gle.com>,
	Stephen Wilson <wilsons@...rt.ca>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	linux-kernel@...r.kernel.org, security@...nel.org
Subject: Re: [PATCH v2] proc: fix races against execve() of /proc/PID/fd**

On Sat, Aug 27, 2011 at 11:01:47PM +0400, Vasiliy Kulikov wrote:
...
>  
> +static int proc_pid_fd_link_getattr(struct vfsmount *mnt, struct dentry *dentry,
> +		struct kstat *stat)
> +{
> +	struct inode *inode = dentry->d_inode;
> +	struct task_struct *task = get_proc_task(inode);
> +	int rc;
> +

Are we sure if the task will be always valid here?

	if (!task)
		return -ENOENT;

	Cyrill
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