From: Dan Rosenberg <dan.j.rosenberg@gmail.com>
Date: Thu, 24 Jun 2010 02:07:47 +0000 (+1000)
Subject: xfs: prevent swapext from operating on write-only files
X-Git-Tag: v2.6.35-rc4~4^2~4
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1817176a86352f65210139d4c794ad2d19fc6b63;p=pandora-kernel.git

xfs: prevent swapext from operating on write-only files

This patch prevents user "foo" from using the SWAPEXT ioctl to swap
a write-only file owned by user "bar" into a file owned by "foo" and
subsequently reading it.  It does so by checking that the file
descriptors passed to the ioctl are also opened for reading.

Signed-off-by: Dan Rosenberg <dan.j.rosenberg@gmail.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
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