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Mon, 20 Jul 2020 14:40:33 +0000 Received: from b03ledav004.gho.boulder.ibm.com (b03ledav004.gho.boulder.ibm.com [9.17.130.235]) by b03cxnp08025.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 06KEeURM39518718 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 20 Jul 2020 14:40:30 GMT Received: from b03ledav004.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id CFDA078077; Mon, 20 Jul 2020 14:40:31 +0000 (GMT) Received: from b03ledav004.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id E51DB78066; Mon, 20 Jul 2020 14:40:29 +0000 (GMT) Received: from swastik.ibm.com (unknown [9.160.78.37]) by b03ledav004.gho.boulder.ibm.com (Postfix) with ESMTP; Mon, 20 Jul 2020 14:40:29 +0000 (GMT) Subject: Re: [PATCH v6] ima: move APPRAISE_BOOTPARAM dependency on ARCH_POLICY to runtime To: Bruno Meneguele , linux-kernel@vger.kernel.org, x86@kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, linux-integrity@vger.kernel.org, zohar@linux.ibm.com Cc: erichte@linux.ibm.com, nayna@linux.ibm.com, stable@vger.kernel.org References: <20200713164830.101165-1-bmeneg@redhat.com> From: Nayna Message-ID: Date: Mon, 20 Jul 2020 10:40:29 -0400 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.9.0 MIME-Version: 1.0 In-Reply-To: <20200713164830.101165-1-bmeneg@redhat.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235,18.0.687 definitions=2020-07-20_09:2020-07-20,2020-07-20 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 malwarescore=0 mlxlogscore=999 suspectscore=0 lowpriorityscore=0 adultscore=0 priorityscore=1501 mlxscore=0 phishscore=0 impostorscore=0 spamscore=0 clxscore=1011 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2007200101 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 7/13/20 12:48 PM, Bruno Meneguele wrote: > The IMA_APPRAISE_BOOTPARAM config allows enabling different "ima_appraise=" > modes - log, fix, enforce - at run time, but not when IMA architecture > specific policies are enabled.  This prevents properly labeling the > filesystem on systems where secure boot is supported, but not enabled on the > platform.  Only when secure boot is actually enabled should these IMA > appraise modes be disabled. > > This patch removes the compile time dependency and makes it a runtime > decision, based on the secure boot state of that platform. > > Test results as follows: > > -> x86-64 with secure boot enabled > > [ 0.015637] Kernel command line: <...> ima_policy=appraise_tcb ima_appraise=fix > [ 0.015668] ima: Secure boot enabled: ignoring ima_appraise=fix boot parameter option > > -> powerpc with secure boot disabled > > [ 0.000000] Kernel command line: <...> ima_policy=appraise_tcb ima_appraise=fix > [ 0.000000] Secure boot mode disabled > > -> Running the system without secure boot and with both options set: > > CONFIG_IMA_APPRAISE_BOOTPARAM=y > CONFIG_IMA_ARCH_POLICY=y > > Audit prompts "missing-hash" but still allow execution and, consequently, > filesystem labeling: > > type=INTEGRITY_DATA msg=audit(07/09/2020 12:30:27.778:1691) : pid=4976 > uid=root auid=root ses=2 > subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 op=appraise_data > cause=missing-hash comm=bash name=/usr/bin/evmctl dev="dm-0" ino=493150 > res=no > > Cc: stable@vger.kernel.org > Fixes: d958083a8f64 ("x86/ima: define arch_get_ima_policy() for x86") > Signed-off-by: Bruno Meneguele Reviewed-by: Nayna Jain Tested-by: Nayna Jain Thanks & Regards,         - Nayna