linux-kernel - Re: security ima: Kernel BUG in ima_file_free -- bisected to commit 6c21a7fb492bf7e2c4985937082ce58ddeca84bd

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Date:	Mon, 1 Feb 2010 12:05:40 -0500
From:	Mimi Zohar <zohar@...ibm.com>
To:	Shi Weihua <shiwh@...fujitsu.com>
Cc:	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Al Viro <viro@...IV.linux.org.uk>
Subject: Re: security ima: Kernel BUG in ima_file_free -- bisected to commit
 6c21a7fb492bf7e2c4985937082ce58ddeca84bd

Shi Weihua <shiwh@...fujitsu.com> wrote on 02/01/2010 12:06:44 AM:

> Hi, Mimi
> 
> Used the latest LTP to test 2.6.33-rc6, a Kernel BUG occured on my 
x86_64 (OS:
> Fedora 12).
> The message from dmesg is as following.
> The LTP case is testcases/kernel/syscalls/pipe/pipe06.c. For seeing code 
easily, I
> recreated a simple code to reproduce this BUG. please check the code in 
the attached.
> 
> I bisected a commit 6c21a7fb492bf7e2c4985937082ce58ddeca84bd,
>     --------
>     commit 6c21a7fb492bf7e2c4985937082ce58ddeca84bd
>     Author: Mimi Zohar <zohar@...ux.vnet.ibm.com>
>     Date:   Thu Oct 22 17:30:13 2009 -0400
> 
>          LSM: imbed ima calls in the security hooks
>     --------
> Maybe you should fix it ;-)

Thanks for isolating the problem.  The problem is caused by 
free_write_pipe()
calling path_put(), which puts the dentry and mnt, before it calls 
put_filp(). 
The ordering should be like in __fput(), which puts the dentry and mnt as 
the
last thing it does.

Mimi
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