full-disclosure - Re: Linux kernel source archive vulnerable

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Date: Fri, 8 Sep 2006 18:18:46 +0200
From: hadmut@...isch.de (Hadmut Danisch)
To: "Gerald (Jerry) Carter" <jerry@...ba.org>
Cc: full-disclosure@...ts.grok.org.uk
Subject: Re: Linux kernel source archive vulnerable

On Fri, Sep 08, 2006 at 10:55:32AM -0500, Gerald (Jerry) Carter wrote:
> 
> It is my understanding that the permissions are
> intentionally set that way.

yup, it's not accidently, it set intentionally. 

But intention does not imply security.

> This hash been discussed several times over the
> past year.

Which proves that this is a common problem and not a personal problem
of mine. The more it has been discussed, the less I can understand why
it hadn't been fixed. 

> http://marc.theaimsgroup.com/?l=linux-kernel&m=114635639325551&w=2
> http://marc.theaimsgroup.com/?l=linux-kernel&m=113304241100330&w=2

Yeah, meanwhile I've read several discussions about this easy. What I
learned so far:

- There are plenty of people with security concerns about this.
- There are plenty of other people ignoring these concerns.
- There is not a single good reason to deliver archive files with 
  world writable permissions. Until now I just found that it is made
  intentionally, but no good reason.

> The standard recommendation is to never compile
> the kernel as root.

So how would you do  

  make install 
  make modules_install

then? This recommendation works only for generating kernel packages,
but not for local installation. 

If this was a standard recommendation, why has the Makefile the
install and modules_install clause at all?

And if this is a standard recommendation, it is not sufficiently
published. If it were, the Makefile itself would tell you 

   "Don't call me as root"

But the Makefile doesn't. 

regards
Hadmut

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