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Date: Tue, 22 Nov 2011 17:18:43 -0500
From: Marc Deslauriers <marc.deslauriers@...onical.com>
To: oss-security@...ts.openwall.com
Subject: Re: Re: [LightDM] Version 1.0.6 released
On Tue, 2011-11-22 at 22:39 +0100, Yves-Alexis Perez wrote:
> 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?
It should be available on kFreeBSD also, isn't it?
Honestly, you can probably just remove that whole section of code. It's
only there to handle a bug in old versions of lightdm that incorrectly
created the ~/.Xauthority file as root.
Marc.
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