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Message-ID: <20110828093156.GA6291@albatros> Date: Sun, 28 Aug 2011 13:31:56 +0400 From: Vasiliy Kulikov <segoon@...nwall.com> To: Cyrill Gorcunov <gorcunov@...il.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** Hi Cyrill, On Sun, Aug 28, 2011 at 13:25 +0400, Cyrill Gorcunov wrote: > 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; No, you're right. It needs (task == NULL) check. Thank you! -- Vasiliy Kulikov http://www.openwall.com - bringing security into open computing environments
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