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Fri, 18 Nov 2022 15:33:20 +0000 (GMT) Message-ID: Subject: Re: [PATCH v4 3/5] security: Allow all LSMs to provide xattrs for inode_init_security hook From: Mimi Zohar To: Roberto Sassu , Casey Schaufler , dmitry.kasatkin@gmail.com, paul@paul-moore.com, jmorris@namei.org, serge@hallyn.com, stephen.smalley.work@gmail.com, eparis@parisplace.org Cc: linux-integrity@vger.kernel.org, linux-security-module@vger.kernel.org, selinux@vger.kernel.org, reiserfs-devel@vger.kernel.org, linux-kernel@vger.kernel.org, keescook@chromium.org, nicolas.bouchinet@clip-os.org, Roberto Sassu Date: Fri, 18 Nov 2022 10:33:19 -0500 In-Reply-To: <2e493258-b267-b8ad-0812-53f4e9c849ae@huaweicloud.com> References: <20221110094639.3086409-1-roberto.sassu@huaweicloud.com> <20221110094639.3086409-4-roberto.sassu@huaweicloud.com> <4c1349f670dc3c23214a5a5036e43ddaa0a7bc89.camel@linux.ibm.com> <026075fa-0b58-9041-0727-b75e19499356@schaufler-ca.com> <2e493258-b267-b8ad-0812-53f4e9c849ae@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-ORIG-GUID: fmVb6IzBeCRCZHKlOYPZxUTS0IK-ggVE X-Proofpoint-GUID: nbT0swbd0VVqMNRdr9wOygUn7Qqg-Kis X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.219,Aquarius:18.0.895,Hydra:6.0.545,FMLib:17.11.122.1 definitions=2022-11-18_04,2022-11-18_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 lowpriorityscore=0 priorityscore=1501 impostorscore=0 clxscore=1015 spamscore=0 mlxscore=0 bulkscore=0 mlxlogscore=588 phishscore=0 malwarescore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2210170000 definitions=main-2211180090 Precedence: bulk List-ID: On Fri, 2022-11-18 at 10:32 +0100, Roberto Sassu wrote: > > Smack uses multiple xattrs. All file system objects have a SMACK64 > > attribute, which is used for access control. A program file may have > > a SMACK64EXEC attribute, which is the label the program will run with. > > A library may have a SMACK64MMAP attribute to restrict loading. A > > directory may have a SMACK64TRANSMUTE attribute, which modifies the > > new object creation behavior. > > > > The point being that it may be more than a "nice idea" to support > > multiple xattrs. It's not a hypothetical situation. > > Ok, that means that I have to change the number of xattrs reserved by > Smack in patch 3. Based on evm_config_default_xattrnames[], there are 4. There's the original SMACK and these 3 additional ones. Mimi