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Mon, 6 Dec 2021 17:26:08 +0000 (GMT) From: Stefan Berger To: linux-integrity@vger.kernel.org Cc: zohar@linux.ibm.com, serge@hallyn.com, christian.brauner@ubuntu.com, containers@lists.linux.dev, dmitry.kasatkin@gmail.com, ebiederm@xmission.com, krzysztof.struczynski@huawei.com, roberto.sassu@huawei.com, mpeters@redhat.com, lhinds@redhat.com, lsturman@redhat.com, puiterwi@redhat.com, jejb@linux.ibm.com, jamjoom@us.ibm.com, linux-kernel@vger.kernel.org, paul@paul-moore.com, rgb@redhat.com, linux-security-module@vger.kernel.org, jmorris@namei.org, Stefan Berger Subject: [PATCH v3 10/16] ima: Implement hierarchical processing of file accesses Date: Mon, 6 Dec 2021 12:25:54 -0500 Message-Id: <20211206172600.1495968-11-stefanb@linux.ibm.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20211206172600.1495968-1-stefanb@linux.ibm.com> References: <20211206172600.1495968-1-stefanb@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: -vocZDvacLf0aQM0v40ixRXqOtW7JkNY X-Proofpoint-ORIG-GUID: xWIq5KwcNcxfEA4CQvc5mCagdiCAITG9 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.790,Hydra:6.0.425,FMLib:17.11.62.513 definitions=2021-12-06_06,2021-12-06_02,2021-12-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 impostorscore=0 clxscore=1015 suspectscore=0 spamscore=0 mlxscore=0 malwarescore=0 mlxlogscore=999 priorityscore=1501 adultscore=0 lowpriorityscore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2110150000 definitions=main-2112060104 Precedence: bulk List-ID: Implement hierarchical processing of file accesses in IMA namespaces by walking the list of IMA namespaces towards the init_ima_ns. This way file accesses can be audited in an IMA namespace and also be evaluated against the IMA policies of parent IMA namespaces. Signed-off-by: Stefan Berger --- security/integrity/ima/ima_main.c | 29 +++++++++++++++++++++++++---- 1 file changed, 25 insertions(+), 4 deletions(-) diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c index d692c9d53a98..42cbcaf2dc1e 100644 --- a/security/integrity/ima/ima_main.c +++ b/security/integrity/ima/ima_main.c @@ -199,10 +199,10 @@ void ima_file_free(struct file *file) ima_check_last_writer(iint, inode, file); } -static int process_measurement(struct ima_namespace *ns, - struct file *file, const struct cred *cred, - u32 secid, char *buf, loff_t size, int mask, - enum ima_hooks func) +static int _process_measurement(struct ima_namespace *ns, + struct file *file, const struct cred *cred, + u32 secid, char *buf, loff_t size, int mask, + enum ima_hooks func) { struct inode *inode = file_inode(file); struct integrity_iint_cache *iint = NULL; @@ -404,6 +404,27 @@ static int process_measurement(struct ima_namespace *ns, return 0; } +static int process_measurement(struct ima_namespace *ns, + struct file *file, const struct cred *cred, + u32 secid, char *buf, loff_t size, int mask, + enum ima_hooks func) +{ + int ret = 0; + struct user_namespace *user_ns; + + do { + ret = _process_measurement(ns, file, cred, secid, buf, size, mask, func); + if (ret) + break; + user_ns = ns->user_ns->parent; + if (!user_ns) + break; + ns = user_ns->ima_ns; + } while (1); + + return ret; +} + /** * ima_file_mmap - based on policy, collect/store measurement. * @file: pointer to the file to be measured (May be NULL)