linux-kernel - Re: [RFC] [PATCH 2/2] capabilities: implement 64-bit capabilities

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Message-ID: <20071018125026.GA10387@vino.hallyn.com>
Date:	Thu, 18 Oct 2007 07:50:26 -0500
From:	"Serge E. Hallyn" <serge@...lyn.com>
To:	Chris Wright <chrisw@...s-sol.org>
Cc:	"Serge E. Hallyn" <serge@...lyn.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Serge E. Hallyn" <serue@...ibm.com>, sds@...ho.nsa.gov,
	linux-security-module@...r.kernel.org, morgan@...nel.org,
	linux-kernel@...r.kernel.org, kaigai@...gai.gr.jp,
	casey@...aufler-ca.com
Subject: Re: [RFC] [PATCH 2/2] capabilities: implement 64-bit capabilities

Quoting Chris Wright (chrisw@...s-sol.org):
> * Serge E. Hallyn (serge@...lyn.com) wrote:
> > I guess now that I've written this out, it seems pretty clear
> > that capget64() and capget64() are the way to go.  Any objections?
> 
> How is capget64() different from capget() that supports 2 different
> header->versions (I thought that was the whole point of the versioned,
> rather opaque interface)?  I don't object to a new syscall, but I don't
> see why it's required to avoid breaking libcap.

Hmm, I guess it *works*, it's just harder to explain the "inconsistent"
behavior.  Now instead of saying "capget() will fail under certain
conditions while capget64() will always succeed", capget() will actually
fail under certain conditions only if you send in a certain header.

Again, once I've written it out, I guess it isn't *so* bad.

thanks,
-serge
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