From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.5 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_2 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 82A17C0650E for ; Mon, 1 Jul 2019 13:23:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6017B214AE for ; Mon, 1 Jul 2019 13:23:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727473AbfGANXj (ORCPT ); Mon, 1 Jul 2019 09:23:39 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:46368 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727010AbfGANXj (ORCPT ); Mon, 1 Jul 2019 09:23:39 -0400 Received: from pps.filterd (m0098421.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x61DNVMD073799 for ; Mon, 1 Jul 2019 09:23:38 -0400 Received: from e06smtp07.uk.ibm.com (e06smtp07.uk.ibm.com [195.75.94.103]) by mx0a-001b2d01.pphosted.com with ESMTP id 2tfh69q1bw-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Mon, 01 Jul 2019 09:23:33 -0400 Received: from localhost by e06smtp07.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Mon, 1 Jul 2019 14:22:30 +0100 Received: from d06av26.portsmouth.uk.ibm.com (d06av26.portsmouth.uk.ibm.com [9.149.105.62]) by b06cxnps3075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x61DMTCc61079606 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 1 Jul 2019 13:22:29 GMT Received: from d06av26.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id C82BDAE053; Mon, 1 Jul 2019 13:22:29 +0000 (GMT) Received: from d06av26.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 9DB51AE04D; Mon, 1 Jul 2019 13:22:27 +0000 (GMT) Received: from localhost.localdomain (unknown [9.80.81.204]) by d06av26.portsmouth.uk.ibm.com (Postfix) with ESMTP; Mon, 1 Jul 2019 13:22:27 +0000 (GMT) Subject: Re: [PATCH v4 0/3] initramfs: add support for xattrs in the initial ram disk From: Mimi Zohar To: Roberto Sassu , viro@zeniv.linux.org.uk Cc: linux-security-module@vger.kernel.org, linux-integrity@vger.kernel.org, initramfs@vger.kernel.org, linux-api@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, bug-cpio@gnu.org, zohar@linux.vnet.ibm.com, silviu.vlasceanu@huawei.com, dmitry.kasatkin@huawei.com, takondra@cisco.com, kamensky@cisco.com, hpa@zytor.com, arnd@arndb.de, rob@landley.net, james.w.mcmechan@gmail.com, niveditas98@gmail.com Date: Mon, 01 Jul 2019 09:22:16 -0400 In-Reply-To: <20190523121803.21638-1-roberto.sassu@huawei.com> References: <20190523121803.21638-1-roberto.sassu@huawei.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.20.5 (3.20.5-1.fc24) Mime-Version: 1.0 Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 x-cbid: 19070113-0028-0000-0000-0000037F5960 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19070113-0029-0000-0000-0000243F8F3C Message-Id: <1561987336.4067.8.camel@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-07-01_09:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=997 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1907010165 Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org On Thu, 2019-05-23 at 14:18 +0200, Roberto Sassu wrote: > This patch set aims at solving the following use case: appraise files from > the initial ram disk. To do that, IMA checks the signature/hash from the > security.ima xattr. Unfortunately, this use case cannot be implemented > currently, as the CPIO format does not support xattrs. > > This proposal consists in including file metadata as additional files named > METADATA!!!, for each file added to the ram disk. The CPIO parser in the > kernel recognizes these special files from the file name, and calls the > appropriate parser to add metadata to the previously extracted file. It has > been proposed to use bit 17:16 of the file mode as a way to recognize files > with metadata, but both the kernel and the cpio tool declare the file mode > as unsigned short. Thanks, Roberto! Victor, Taras, Rob, Arvind, Peter, if you're good with this latest design, could we get some Reviewed-by, Acked-by, or Tested-by? thanks! Mimi