linux-ext4 - Re: [PATCH] Check for immutable flag in fallocate path

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Date:	Mon, 21 Feb 2011 17:50:21 +0100
From:	Marco Stornelli <marco.stornelli@...il.com>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>,
	cluster-devel@...hat.com,
	Linux FS Devel <linux-fsdevel@...r.kernel.org>,
	linux-ext4@...r.kernel.org, linux-btrfs@...r.kernel.org,
	xfs@....sgi.com
Subject: Re: [PATCH] Check for immutable flag in fallocate path

2011/2/21 Christoph Hellwig <hch@...radead.org>:
> On Mon, Feb 21, 2011 at 09:26:32AM +0100, Marco Stornelli wrote:
>> From: Marco Stornelli <marco.stornelli@...il.com>
>>
>> All fs must check for the immutable flag in their fallocate callback.
>> It's possible to have a race condition in this scenario: an application
>> open a file in read/write and it does something, meanwhile root set the
>> immutable flag on the file, the application at that point can call
>> fallocate with success. Only Ocfs2 check for the immutable flag at the
>> moment.
>
> Please add the check in fs/open.c:do_fallocate() so that it covers all
> filesystems.
>
>

The check should be done after the fs got the inode mutex lock.

Marco
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