Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756687Ab0FAT3M (ORCPT ); Tue, 1 Jun 2010 15:29:12 -0400 Received: from e36.co.us.ibm.com ([32.97.110.154]:46957 "EHLO e36.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756605Ab0FAT3I (ORCPT ); Tue, 1 Jun 2010 15:29:08 -0400 Subject: Re: [PATCH 00/14] EVM From: Mimi Zohar To: Shaz Cc: James Morris , linux-kernel@vger.kernel.org, linux-security-module@vger.kernel.org, David Safford , Dave Hansen , Arjan van de Ven , securityengineeringresearchgroup In-Reply-To: References: <1271886594-3719-1-git-send-email-zohar@linux.vnet.ibm.com> Content-Type: text/plain; charset="UTF-8" Date: Tue, 01 Jun 2010 15:28:56 -0400 Message-ID: <1275420536.28134.37.camel@localhost.localdomain> Mime-Version: 1.0 X-Mailer: Evolution 2.28.3 (2.28.3-1.fc12) Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1277 Lines: 31 On Mon, 2010-05-31 at 15:08 +0500, Shaz wrote: > > EVM is based on EA while Aegis does not use EA as far as I can > > understand from the documentation available. Can we make EVM > > independent of EA? Even the MAC mechanism is very different then > > existing LSM based mechanisms. > > Have a look at the following: > > http://research.nokia.com/files/NRCTR2008010.pdf > http://research.nokia.com/files/NRCTR2008007.pdf > http://lwn.net/Articles/372937/ SELinux, Smack, Capabilities, and IMA all use extended attributes. The purpose of EVM is to detect offline tampering of these security extended attributes. The IMA integrity appraisal extension extends IMA with local measurement appraisal. The extension stores and maintains the file integrity measurement as an extended attribute 'security.ima', which EVM can be configured to protect. Instead of storing the hash measurement as an extended attribute, the file hashes could be loaded in kernel memory, as long as the appraise policy is appropriately constrained. Mimi -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/