Message-ID: <4207EBD4.9090104@comcast.net>
Date: Mon, 07 Feb 2005 17:29:40 -0500
From: John Richard Moser <nigelenki@comcast.net>
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To: Chris Wright <chrisw@osdl.org>
CC: =?ISO-8859-1?Q?Lorenzo_Hern=E1ndez_Garc=EDa-Hierro?= 
	<lorenzo@gnu.org>,
       "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] Filesystem linking protections
References: <1107802626.3754.224.camel@localhost.localdomain> <20050207111235.Y24171@build.pdx.osdl.net> <4207C4C7.8080704@comcast.net> <20050207120516.A24171@build.pdx.osdl.net>
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Chris Wright wrote:
> * John Richard Moser (nigelenki@comcast.net) wrote:
> 
>>I've yet to see this break anything on Ubuntu or Gentoo; Brad Spengler
>>claims this breaks nothing on Debian.  On the other hand, this could
>>potentially squash the second most prevalent security bug.
> 
> 
> Yes I know, I've worked on distro with it as well in the past.  And it
> has broken atd and courier in the past.  This is something that also
> can be done in userspace using sane subdirs in +t world writable dirs,
> or O_EXCL so there's work to be done in userspace.
> 

Yes, mkdtemp() and mkstemp().

Of course we can't always rely on programmers to get it right, so the
idea here is to make sure we ask broken code to behave nicely, and stab
it in the face if it doesn't.  Please try to examine this in that scope.

> thanks,
> -chris

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