Date: Fri, 11 Nov 2011 13:27:13 -0500 From: Marc Deslauriers <marc.deslauriers@...onical.com> To: oss-security@...ts.openwall.com Subject: Re: Re: [LightDM] Version 1.0.6 released On Fri, 2011-11-11 at 10:05 +0000, John Haxby wrote: > On 11/11/11 08:06, Guido Berhoerster wrote: > > Replacing the file between the lstat and the open would change > > its inode and then be caught by the check before the fchown, no? > > Nope. There is no reason why the same inode should not be reused. > > On ext4 (btrfs seems to be different): > > $ touch test; ls -i test; rm test; touch test; ls -i test > 656078 test > 656078 test > > jch How about the attached patch? Marc. View attachment "04_CVE-2011-4105.patch" of type "text/x-patch" (1512 bytes)
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