linux-kernel - Re: 2.6.18-mm1 violates sandbox feature on linux distribution

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Message-ID: <4520DE2C.7000300@web.de>
Date:	Mon, 02 Oct 2006 09:38:52 +0000
From:	Michael Rasenberger <miraze@....de>
To:	Sam Ravnborg <sam@...nborg.org>
CC:	linux-kernel@...r.kernel.org
Subject: Re: 2.6.18-mm1 violates sandbox feature on linux distribution

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Hello,

maybe this helps: http://bugday.gentoo.org/sandbox.html.
Basically the sandbox is a kind of security mechanism that prevents
files from being created outside a specific directory during package
installation phases (unpacking, compiling ..).

If the package uses KBuild to make a kernel module the sandbox is
triggered under 2.6.18-mm1 because of the temporary file creation in the
kernel directory.

Of course this feature can be bypassed (e.g. disable sandbox), but if
there is a way to do these tests without file creation it would be much
more consistent. Btw. is there a reason for creating the file? AFAICS
there is not test performed on it?

I have to admit that due to the nature of -mm of being a testbed this is
not a critical issue.

Michael

Sam Ravnborg wrote:
> On Wed, Sep 27, 2006 at 06:08:14PM +0000, Michael Rasenberger wrote:
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>>
>> Hello,
>>
>> when building external kernel module on gentoo linux distribution,
>> 2.6.18-mm1 violates gentoo's sandbox feature due to file creation in
>> "as-instr" test in scripts/Kbuild.include. (AFAIK due to removal of
>> revert-x86_64-mm-detect-cfi.patch)
> 
> Can you point to to some description of this sandbox feature.
> The error you point out looks pretty generic and should happen
> in several places - so I need to understand what problem I shall
> fix before trying to fix it.
> 
> The point is that we have other places where we create temporary files
> so this should not be the only issue.
> 
> 	Sam
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