linux-kernel - Re: implement-file-posix-capabilities.patch

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Message-ID: <468352EC.2080704@kernel.org>
Date:	Wed, 27 Jun 2007 23:19:24 -0700
From:	Andrew Morgan <morgan@...nel.org>
To:	"Serge E. Hallyn" <serue@...ibm.com>
CC:	"Serge E. Hallyn" <serge@...lyn.com>,
	Chris Wright <chrisw@...s-sol.org>,
	Andrew Morgan <agm@...gle.com>, casey@...aufler-ca.com,
	Andrew Morton <akpm@...gle.com>,
	Stephen Smalley <sds@...ho.nsa.gov>,
	James Morris <jmorris@...ei.org>,
	linux-security-module@...r.kernel.org,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: implement-file-posix-capabilities.patch

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Serge E. Hallyn wrote:
>> Does that explain it?
> 
> Yes, thanks, but then it still could come in handy to have fE be a full
> bitset, so the application gets some eff caps automatically, while
> others it has to manually set...

[We touched on this a number of emails back.]

If an application is capability aware, it can manipulate its own
capabilities and should have fE=0.

If an application is not capability aware, it needs to have *all* of its
capabilities enabled at exec() time. Otherwise, it won't work.

The only reason for having an fE bitmap is to allow a capability-aware
program (you really trust to do its privileged operations carefully) to
be lazy and get some of its capabilities raised for free. Perhaps you
can clarify why this is a desirable thing? :-)

Cheers

Andrew
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