linux-kernel - Re: [PATCH] Undo some of the pseudo-security madness

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Message-Id: <1D317613-B0B6-4517-81B5-DBF3978FA413@mac.com>
Date:	Sun, 21 Jan 2007 19:36:27 -0500
From:	Kyle Moffett <mrmacman_g4@....com>
To:	David Wagner <daw-usenet@...erner.cs.berkeley.edu>
Cc:	LKML Kernel <linux-kernel@...r.kernel.org>,
	Samium Gromoff <_deepfire@...lingofgreen.ru>
Subject: Re: [PATCH] Undo some of the pseudo-security madness

On Jan 21, 2007, at 18:34:56, David Wagner wrote:
> [1] In comparison, suidperl was designed to be installed setuid- 
> root, and it takes special precautions to be safe in this usage.   
> (And even it has had some security vulnerabilities, despite its  
> best efforts, which illustrates how tricky this business can be.)   
> Setting the setuid-root bit on a large complex interpreter that  
> wasn't designed to be setuid-root seems like a pretty dubious  
> proposition to me.

Well, there's also the fact that Linux does *NOT* need suidperl, as  
it has proper secure support for suid pound-bang scripts anyways.   
The only reason for suidperl in the first place was broken operating  
systems which had a race condition between the operating system  
checking the suid bits and reading the '#! /usr/bin/perl' line in the  
file, and the interpreter getting executed and opening a different  
file (think symlink redirection attacks).  I believe Linux jumps  
through some special hoops to ensure that can't happen.

Cheers,
Kyle Moffett

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