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Re: [Xen-devel] [PATCH][ACM] kernel enforcement of vbd policies via blkb

To: "Bryan D. Payne" <bdpayne@xxxxxxxxxx>
Subject: Re: [Xen-devel] [PATCH][ACM] kernel enforcement of vbd policies via blkback driver
From: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
Date: Mon, 24 Jul 2006 18:28:28 +0100
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On 24 Jul 2006, at 17:23, Bryan D. Payne wrote:

This patch modifies the blkback driver to perform a security check (via an ACM get_decision hypercall) before connecting a vbd to a domain. While the security checks performed in the xm tools are convenient for the users, the check added here is intended to strengthen the security guarantees.

Note that the security check in blkback is only enabled when ACM_SECURITY=y in Config.mk.

Signed-off-by: Bryan D. Payne <bdpayne@xxxxxxxxxx>
Signed-off-by: Reiner Sailer <sailer@xxxxxxxxxx>

Wouldn't this be better checked in the tool stack, rather than the particular block device driver (which is as likely to be blktap as blkback in future -- control tools would provide a point of common infrastructure to make this check, regardless of choice of actual backend driver)?

 -- Keir

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