full-disclosure - Re: Linux kernel source archive vulnerable

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Message-ID: <4501A321.8050906@samba.org>
Date: Fri, 08 Sep 2006 12:06:41 -0500
From: "Gerald (Jerry) Carter" <jerry@...ba.org>
To: Hadmut Danisch <hadmut@...isch.de>
Cc: full-disclosure@...ts.grok.org.uk
Subject: Re: Linux kernel source archive vulnerable

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Hadmut Danisch wrote:

> 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 accidentally, it set intentionally. 
> But intention does not imply security.

I'm not necessarily disagreeing with you.

My point was that reporting it here will probably
not get any policy changed.  And your original
message did not acknowledge past discussions from
what I could tell.

If you are trying to excerpt community pressure to
get the policy changed, then it would have been
better to make that motivation more apparent.

>> The standard recommendation is to never compile
>> the kernel as root.
> 
> So how would you do  
> 
>   make install 
>   make modules_install

Building and install are separate operations.  If
you unpack the kernel as non-root, then the versions
of tar I've tested do not preserve the original
permissions but rather apply the current umask.
You can su to root when you are ready to install.

It's the same reason sing that people advise not
running rpmbuild as root (although many people
continue to do so).

cheers, jerry
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