linux-kernel - Re: patch to make Linux capabilities into something useful (v 0.3.1)

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Message-ID: <20060907173449.GA24013@clipper.ens.fr>
Date:	Thu, 7 Sep 2006 19:34:49 +0200
From:	David Madore <david.madore@....fr>
To:	Linux Kernel mailing-list <linux-kernel@...r.kernel.org>
Subject: Re: patch to make Linux capabilities into something useful (v 0.3.1)

On Thu, Sep 07, 2006 at 01:01:48AM +0000, Casey Schaufler wrote:
> --- David Madore <david.madore@....fr> wrote:
> > doesn't it make sense to implement them in the same
> > framework?
> 
> I'm certainly not convinced that you'd
> want that. Think of all the programs that
> would have to be marked with CAP_FORK.

They wouldn't have to be marked: capabilities are inherited by
default, with my patch (as is the Unix tradition: euid=0 or {r,s}uid=0
are preserved upon execve()), normal processes have CAP_FORK and just
pass it on if you don't do something special to remove it.

> > Rather
> > than trying to reproduce the same rules in a
> > different part of the
> > kernel, causing code reduplication which would
> > eventually, inevitably,
> > fall out of sync...  I think it's easier for
> > everyone if under- and
> > over-privileges are treated in a uniform fashion.
> 
> This again assumes that you want to require
> that in general processes run with some
> capabilities.

Yes.  In general, processes have all "regular" capabilities, and they
are inherited normally.

-- 
     David A. Madore
    (david.madore@....fr,
     http://www.madore.org/~david/ )
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