oss-security - CVE request - kernel: xfs swapext ioctl issue

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Message-ID: <4C19FBFB.9090401@kernel.sg>
Date: Thu, 17 Jun 2010 18:42:03 +0800
From: Eugene Teo <eugeneteo@...nel.sg>
To: oss-security@...ts.openwall.com
CC: "Steven M. Christey" <coley@...us.mitre.org>
Subject: CVE request - kernel: xfs swapext ioctl issue

User "foo" can use 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.

References:
https://bugzilla.redhat.com/show_bug.cgi?id=605158
http://archives.free.net.ph/message/20100616.130710.301704aa.en.html
http://archives.free.net.ph/message/20100616.135735.40f53a32.en.html

Thanks, Eugene
-- 
main(i) { putchar(182623909 >> (i-1) * 5&31|!!(i<7)<<6) && main(++i); }

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