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Fri, 10 Dec 2021 19:47:39 +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 v6 10/17] ima: Implement hierarchical processing of file accesses Date: Fri, 10 Dec 2021 14:47:29 -0500 Message-Id: <20211210194736.1538863-11-stefanb@linux.ibm.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20211210194736.1538863-1-stefanb@linux.ibm.com> References: <20211210194736.1538863-1-stefanb@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: 8RCH_TY1yDOeMePp04PF3cWZ_lfsPnky X-Proofpoint-GUID: b0zkdrDhrIjxNPfxpZYdSBciGEoYLHx0 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=2021-12-10_07,2021-12-10_01,2021-12-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 malwarescore=0 phishscore=0 spamscore=0 suspectscore=0 mlxscore=0 lowpriorityscore=0 bulkscore=0 priorityscore=1501 clxscore=1015 adultscore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2110150000 definitions=main-2112100106 Precedence: bulk List-ID: X-Mailing-List: linux-integrity@vger.kernel.org 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 --- include/linux/ima.h | 9 +++++++++ security/integrity/ima/ima_main.c | 29 +++++++++++++++++++++++++---- 2 files changed, 34 insertions(+), 4 deletions(-) diff --git a/include/linux/ima.h b/include/linux/ima.h index 85903f40acfd..fda371cbde50 100644 --- a/include/linux/ima.h +++ b/include/linux/ima.h @@ -66,6 +66,15 @@ static inline const char * const *arch_get_ima_policy(void) } #endif +static inline struct user_namespace *ima_user_ns(struct ima_namespace *ns) +{ + struct user_namespace *user_ns; + + user_ns = current_user_ns(); + WARN_ON(user_ns->ima_ns != ns); + return user_ns; +} + #else static inline enum hash_algo ima_get_current_hash_algo(void) { diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c index 2121a831f38a..6ebc57cd91d3 100644 --- a/security/integrity/ima/ima_main.c +++ b/security/integrity/ima/ima_main.c @@ -200,10 +200,10 @@ 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; @@ -405,6 +405,27 @@ 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) +{ + struct user_namespace *user_ns = ima_user_ns(ns); + int ret = 0; + + while (user_ns) { + ns = user_ns->ima_ns; + + ret = __process_measurement(ns, file, cred, secid, buf, size, mask, func); + if (ret) + break; + + user_ns = user_ns->parent; + }; + + return ret; +} + /** * ima_file_mmap - based on policy, collect/store measurement. * @file: pointer to the file to be measured (May be NULL)