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

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Message-ID: <47177B65.7040408@kernel.org>
Date:	Thu, 18 Oct 2007 08:27:33 -0700
From:	Andrew Morgan <morgan@...nel.org>
To:	"Serge E. Hallyn" <serge@...lyn.com>
CC:	Chris Wright <chrisw@...s-sol.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Serge E. Hallyn" <serue@...ibm.com>, sds@...ho.nsa.gov,
	linux-security-module@...r.kernel.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

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Serge E. Hallyn wrote:
> 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.

[I'm just wading back into a mass of neglected email. Long story.]

Chris is right, this is precisely why the interface is versioned, and
there is at least one version of libcap that was written to support this
versioning scheme

cvs -z3
- -d:pserver:anonymous@....linux-privs.sourceforge.net:/cvsroot/linux-privs
co -r libcap-pre2 libcap

I'll try and unwind all the threads of email I've been neglecting and
have something useful to say over the next few days.

Cheers

Andrew

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