linux-kernel - Re: [Xen-devel] [PATCH 1/2] xen: Implement ioctl to restrict privcmd to a specific domain

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Message-Id: <53DB6B8D02000078000284D3@mail.emea.novell.com>
Date:	Fri, 01 Aug 2014 09:27:25 +0100
From:	"Jan Beulich" <JBeulich@...e.com>
To:	"Frediano Ziglio" <frediano.ziglio@...rix.com>
Cc:	"David Vrabel" <david.vrabel@...rix.com>,
	"xen-devel" <xen-devel@...ts.xenproject.org>,
	"Boris Ostrovsky" <boris.ostrovsky@...cle.com>,
	"Konrad Rzeszutek Wilk" <konrad.wilk@...cle.com>,
	<linux-api@...r.kernel.org>,
	"linux-kernel" <linux-kernel@...r.kernel.org>
Subject: Re: [Xen-devel] [PATCH 1/2] xen: Implement ioctl to restrict
 privcmd to a specific domain

>>> On 31.07.14 at 15:16, <frediano.ziglio@...rix.com> wrote:
> Add a RESTRICT ioctl to /dev/xen/privcmd, which allows privileged commands
> file descriptor to be restricted to only working with a particular domain.

The "with" here has been quite confusing, and I realized that you
mean the subject domain rather than the actor one only after
having gone through quite some parts of the patch. For a patch
this size, a little more of a description (and the original motivation)
would have helped.

Wrt motivation: Why does this need enforcing in the kernel at all?
Doesn't XSM_DM_PRIV mode deal specifically with what you're
trying to do here? Or else I guess I really need some better
explanation of what this is about.

Jan

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