Messages in this thread | | | Date | Mon, 21 Feb 2011 17:50:21 +0100 | Subject | Re: [PATCH] Check for immutable flag in fallocate path | From | Marco Stornelli <> |
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2011/2/21 Christoph Hellwig <hch@infradead.org>: > On Mon, Feb 21, 2011 at 09:26:32AM +0100, Marco Stornelli wrote: >> From: Marco Stornelli <marco.stornelli@gmail.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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