linux-kernel - Re: JIT emulator needs

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Date:	Wed, 20 Jun 2007 11:23:09 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	William Lee Irwin III <wli@...omorphy.com>
CC:	Albert Cahalan <acahalan@...il.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: JIT emulator needs

William Lee Irwin III wrote:
> William Lee Irwin III wrote:
>>> I presumed an ELF note or extended filesystem attributes were already
>>> in place for this sort of affair. It may be that the model implemented
>>> is so restrictive that users are forbidden to create new executables,
>>> in which case using a different model is certainly in order. Otherwise
>>> the ELF note or attributes need to be implemented.
> 
> On Wed, Jun 20, 2007 at 09:37:31AM -0700, H. Peter Anvin wrote:
>> Another thing to keep in mind, since we're talking about security
>> policies in the first place, is that anything like this *MUST* be
>> "opt-in" on the part of the security policy, because what we're talking
>> about is circumventing an explicit security policy just based on a
>> user-provided binary saying, in effect, "don't worry, I know what I'm
>> doing."
>> Changing the meaning of an established explicit security policy is not
>> acceptable.
> 
> This is what I had in mind with the commentary on the intentions of the
> policy. Thank you for correcting my hamhanded attempt to describe it.
> 

Right.  It's important to notice that it's actually more of an issue if
the user can create executables, but the policy doesn't want to allow
them to run bypassing the policy.

	-hpa
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