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Fri, 3 Dec 2021 02:31:47 +0000 (GMT) Received: from sbct-3.pok.ibm.com (unknown [9.47.158.153]) by b03ledav001.gho.boulder.ibm.com (Postfix) with ESMTP; Fri, 3 Dec 2021 02:31:47 +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: [RFC v2 18/19] ima/userns: Define early teardown function for IMA namespace Date: Thu, 2 Dec 2021 21:31:17 -0500 Message-Id: <20211203023118.1447229-19-stefanb@linux.ibm.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20211203023118.1447229-1-stefanb@linux.ibm.com> References: <20211203023118.1447229-1-stefanb@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: DYvATug6x_-Y7slM5HF57KiqdlA5e-fl X-Proofpoint-GUID: NYnnnepozcsBGNwlcQ21CZ8zXmvCkf8r 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=2021-12-03_01,2021-12-02_01,2021-12-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 impostorscore=0 mlxlogscore=999 spamscore=0 priorityscore=1501 adultscore=0 mlxscore=0 bulkscore=0 clxscore=1015 lowpriorityscore=0 phishscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2110150000 definitions=main-2112030014 Precedence: bulk List-ID: Define an early teardown function ima_ns_userns_early_teardown() that will be needed for early teardown of the namespaced SecurityFS used by an IMA namespace since this holds one additional references to the user namespace. This function is not called yet since the refcount_teardown variable at this point is always 0. Signed-off-by: Stefan Berger --- include/linux/user_namespace.h | 8 ++++++-- security/integrity/ima/ima_ns.c | 6 ++++++ 2 files changed, 12 insertions(+), 2 deletions(-) diff --git a/include/linux/user_namespace.h b/include/linux/user_namespace.h index 505e3b3748b6..8f7870b37c73 100644 --- a/include/linux/user_namespace.h +++ b/include/linux/user_namespace.h @@ -158,14 +158,18 @@ static inline struct user_namespace *get_user_ns(struct user_namespace *ns) extern int create_user_ns(struct cred *new); extern int unshare_userns(unsigned long unshare_flags, struct cred **new_cred); extern void __put_user_ns(struct user_namespace *ns); +extern void ima_ns_userns_early_teardown(struct ima_namespace *ns); static inline void put_user_ns(struct user_namespace *ns) { if (ns) { if (refcount_dec_and_test(&ns->ns.count)) __put_user_ns(ns); - else if (refcount_read(&ns->ns.count) == ns->refcount_teardown) - ; + else if (refcount_read(&ns->ns.count) == ns->refcount_teardown) { +#ifdef CONFIG_IMA_NS + ima_ns_userns_early_teardown(ns->ima_ns); +#endif + } } } diff --git a/security/integrity/ima/ima_ns.c b/security/integrity/ima/ima_ns.c index debe863364fd..4260f96c4eca 100644 --- a/security/integrity/ima/ima_ns.c +++ b/security/integrity/ima/ima_ns.c @@ -16,6 +16,7 @@ #include #include #include +#include #include "ima.h" @@ -64,6 +65,11 @@ struct ima_namespace *copy_ima_ns(struct ima_namespace *old_ns, return create_ima_ns(user_ns); } +void ima_ns_userns_early_teardown(struct ima_namespace *ns) +{ +} +EXPORT_SYMBOL(ima_ns_userns_early_teardown); + static void destroy_ima_ns(struct ima_namespace *ns) { pr_debug("DESTROY ima_ns: 0x%p\n", ns);