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Date: Tue, 22 Nov 2011 22:39:03 +0100
From: Yves-Alexis Perez <corsac@...ian.org>
To: oss-security@...ts.openwall.com
Subject: Re: Re: [LightDM] Version 1.0.6 released

On ven., 2011-11-11 at 13:27 -0500, Marc Deslauriers wrote:
> 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.

Note that O_NOFOLLOW seems to be Linux-only. Any idea how to handle it
on other ports?

Regards,
-- 
Yves-Alexis

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