linux-kernel - Re: [PATCH] do_task_stat: don't use task_pid_nr

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Message-ID: <m1fxz4ws2z.fsf@ebiederm.dsl.xmission.com>
Date:	Sat, 17 Nov 2007 13:11:00 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Oleg Nesterov <oleg@...sign.ru>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Pavel Emelyanov <xemul@...nvz.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] do_task_stat: don't use task_pid_nr_ns() lockless

Oleg Nesterov <oleg@...sign.ru> writes:

> Without rcu/tasklist/siglock lock task_pid_nr_ns() may read the freed memory,
> move the callsite under ->siglock.
>
> Sadly, we can report pid == 0 if the task was detached.

We only get detached in release_task so it is a pretty small window
where we can return pid == 0.  Usually get_task_pid will fail first
and we will return -ESRCH.  Still the distance from open to 

There is another bug in here as well.  current->nsproxy->pid_ns is wrong.
What we want is: ns = dentry->d_sb->s_fs_info;

Otherwise we will have file descriptor passing races and the like.

We could also do: proc_pid(inode) to get the pid, which is a little
more race free, and will prevent us from returning pid == 0.

In either event it looks like we need to implement some proper
file operations for these proc files, maybe even going to seq file
status.

Eric
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