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Tue, 11 Apr 2023 07:22:59 GMT Received: from smtpav05.dal12v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 2884758067; Tue, 11 Apr 2023 07:22:59 +0000 (GMT) Received: from smtpav05.dal12v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 4A0EE58052; Tue, 11 Apr 2023 07:22:54 +0000 (GMT) Received: from li-f45666cc-3089-11b2-a85c-c57d1a57929f.ibm.com (unknown [9.211.109.203]) by smtpav05.dal12v.mail.ibm.com (Postfix) with ESMTP; Tue, 11 Apr 2023 07:22:54 +0000 (GMT) Message-ID: <1496aa1d378c3d7dc1b112b0d81fa7459aaee143.camel@linux.ibm.com> Subject: Re: [PATCH v10 4/4] evm: Support multiple LSMs providing an xattr From: Mimi Zohar To: Roberto Sassu , dmitry.kasatkin@gmail.com, paul@paul-moore.com, jmorris@namei.org, serge@hallyn.com, stephen.smalley.work@gmail.com, eparis@parisplace.org, casey@schaufler-ca.com Cc: reiserfs-devel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-integrity@vger.kernel.org, linux-security-module@vger.kernel.org, selinux@vger.kernel.org, bpf@vger.kernel.org, kpsingh@kernel.org, keescook@chromium.org, nicolas.bouchinet@clip-os.org, Roberto Sassu Date: Tue, 11 Apr 2023 03:22:52 -0400 In-Reply-To: <20230331123221.3273328-5-roberto.sassu@huaweicloud.com> References: <20230331123221.3273328-1-roberto.sassu@huaweicloud.com> <20230331123221.3273328-5-roberto.sassu@huaweicloud.com> Content-Type: text/plain; charset="ISO-8859-15" X-Mailer: Evolution 3.28.5 (3.28.5-18.el8) Mime-Version: 1.0 Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: xnLuj3iiRxW414W3ggGW-iv_bI3t9Pr4 X-Proofpoint-ORIG-GUID: EMwnd3qD--UhdWadvezBYKMYJDSWph4o X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.942,Hydra:6.0.573,FMLib:17.11.170.22 definitions=2023-04-11_03,2023-04-06_03,2023-02-09_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 impostorscore=0 phishscore=0 spamscore=0 clxscore=1015 bulkscore=0 lowpriorityscore=0 adultscore=0 suspectscore=0 priorityscore=1501 mlxlogscore=999 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2303200000 definitions=main-2304110065 X-Spam-Status: No, score=-0.1 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_EF,SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 2023-03-31 at 14:32 +0200, Roberto Sassu wrote: > From: Roberto Sassu > > Currently, evm_inode_init_security() processes a single LSM xattr from the > array passed by security_inode_init_security(), and calculates the HMAC on > it and other inode metadata. > > As the LSM infrastructure now can pass to EVM an array with multiple > xattrs, scan them until the terminator (xattr name NULL), and calculate the > HMAC on all of them. > > Also, double check that the xattrs array terminator is the first non-filled > slot (obtained with lsm_get_xattr_slot()). Consumers of the xattrs array, > such as the initxattrs() callbacks, rely on the terminator. > > Finally, change the name of the lsm_xattr parameter of evm_init_hmac() to > xattrs, to reflect the new type of information passed. > > Signed-off-by: Roberto Sassu Reviewed-by: Mimi Zohar