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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Mon, 6 May 2019 13:13:12 +0100 Received: from d06av26.portsmouth.uk.ibm.com (d06av26.portsmouth.uk.ibm.com [9.149.105.62]) by b06cxnps4075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x46CDBJI59899906 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 6 May 2019 12:13:12 GMT Received: from d06av26.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id DCC37AE053; Mon, 6 May 2019 12:13:11 +0000 (GMT) Received: from d06av26.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 98BCAAE045; Mon, 6 May 2019 12:13:10 +0000 (GMT) Received: from localhost.localdomain (unknown [9.80.95.145]) by d06av26.portsmouth.uk.ibm.com (Postfix) with ESMTP; Mon, 6 May 2019 12:13:10 +0000 (GMT) Subject: Re: [PATCH 0/5 v4] Kexec cmdline bufffer measure From: Mimi Zohar To: Prakhar Srivastava , linux-integrity@vger.kernel.org, linux-secuirty-module@vger.kernel.org, linux-kernel@vger.kernel.org Cc: ebiederm@xmission.com, vgoyal@redhat.com, nayna@linux.ibm.com, nramas@microsoft.com, prsriva@microsoft.com Date: Mon, 06 May 2019 08:12:59 -0400 In-Reply-To: <20190503222523.6294-1-prsriva02@gmail.com> References: <20190503222523.6294-1-prsriva02@gmail.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: 8bit X-TM-AS-GCONF: 00 x-cbid: 19050612-0020-0000-0000-00000339CBA3 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19050612-0021-0000-0000-0000218C6061 Message-Id: <1557144779.14288.92.camel@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-05-06_08:,, 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=918 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1905060107 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 2019-05-03 at 15:25 -0700, Prakhar Srivastava wrote: > From: Prakhar Srivastava > > For Kexec scenario(kexec_file_load) cmdline args are passed to the > next kerenel. These cmldine args used to load the next kernel can > have undesired/unwanted configs. To guard against any unwanted cmdline > args being passed to the next kernel. The current kernel should measure > the cmdline args to the next kernel, the same takes place in the EFI > bootloader. Thus on kexec the boot_aggregate does not change. The boot command line is calculated and added to the current running kernel's measurement list.  On a soft reboot like kexec, the PCRs are not reset to zero.  Refer to commit 94c3aac567a9 ("ima: on soft reboot, restore the measurement list") patch description. > Currently the cmdline args are not measured, this changeset adds a new > ima and LSM hook for buffer measure and calls into the same to measure > the cmdline args passed to the next kernel.The cdmline args meassured > can then be used as an attestation criteria. Please update this paragraph to reflect the current patch set.  > > The ima logs need to injected into the next kernel, which will be followed > up by other patchsets. The log isn't "injected" into the next kernel, but needs to be carried over, as described in the above referenced commit. Mimi