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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 14/17] ima: Tie opened SecurityFS files to the IMA namespace it belongs to Date: Fri, 10 Dec 2021 14:47:33 -0500 Message-Id: <20211210194736.1538863-15-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 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: ezDsSUc3jztVFRcGJyhBUeoeeLtevKQa X-Proofpoint-GUID: YBBYPq93c9aDIbGvG8mESVRbwn52nRyR 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 spamscore=0 adultscore=0 bulkscore=0 suspectscore=0 lowpriorityscore=0 mlxscore=0 priorityscore=1501 phishscore=0 malwarescore=0 impostorscore=0 clxscore=1015 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 Tie IMA's files in SecurityFS to the IMA namespace they belong to so that also file descriptor that were passed or inherited to other user/IMA namespaces will always access the data of the IMA namespace they originally belonged to. Signed-off-by: Stefan Berger --- security/integrity/ima/ima_fs.c | 74 ++++++++++++++++++++++++----- security/integrity/ima/ima_policy.c | 4 +- 2 files changed, 63 insertions(+), 15 deletions(-) diff --git a/security/integrity/ima/ima_fs.c b/security/integrity/ima/ima_fs.c index 0e582ceecc7f..a136d14f29ec 100644 --- a/security/integrity/ima/ima_fs.c +++ b/security/integrity/ima/ima_fs.c @@ -35,6 +35,20 @@ static int __init default_canonical_fmt_setup(char *str) } __setup("ima_canonical_fmt", default_canonical_fmt_setup); +static inline struct user_namespace *ima_user_ns_from_file(struct file *filp) +{ + return filp->f_path.mnt->mnt_sb->s_user_ns; +} + +static int ima_open(struct inode *inode, struct file *file) +{ + struct user_namespace *user_ns = ima_user_ns_from_file(file); + struct ima_namespace *ns = user_ns->ima_ns; + + file->private_data = ns; + return 0; +} + static ssize_t ima_show_htable_value(char __user *buf, size_t count, loff_t *ppos, atomic_long_t *val) { @@ -49,12 +63,13 @@ static ssize_t ima_show_htable_violations(struct file *filp, char __user *buf, size_t count, loff_t *ppos) { - struct ima_namespace *ns = get_current_ns(); + struct ima_namespace *ns = filp->private_data; return ima_show_htable_value(buf, count, ppos, &ns->ima_htable.violations); } static const struct file_operations ima_htable_violations_ops = { + .open = ima_open, .read = ima_show_htable_violations, .llseek = generic_file_llseek, }; @@ -63,12 +78,13 @@ static ssize_t ima_show_measurements_count(struct file *filp, char __user *buf, size_t count, loff_t *ppos) { - struct ima_namespace *ns = get_current_ns(); + struct ima_namespace *ns = filp->private_data; return ima_show_htable_value(buf, count, ppos, &ns->ima_htable.len); } static const struct file_operations ima_measurements_count_ops = { + .open = ima_open, .read = ima_show_measurements_count, .llseek = generic_file_llseek, }; @@ -76,7 +92,7 @@ static const struct file_operations ima_measurements_count_ops = { /* returns pointer to hlist_node */ static void *ima_measurements_start(struct seq_file *m, loff_t *pos) { - struct ima_namespace *ns = get_current_ns(); + struct ima_namespace *ns = m->private; loff_t l = *pos; struct ima_queue_entry *qe; @@ -94,7 +110,7 @@ static void *ima_measurements_start(struct seq_file *m, loff_t *pos) static void *ima_measurements_next(struct seq_file *m, void *v, loff_t *pos) { - struct ima_namespace *ns = get_current_ns(); + struct ima_namespace *ns = m->private; struct ima_queue_entry *qe = v; /* lock protects when reading beyond last element @@ -195,9 +211,26 @@ static const struct seq_operations ima_measurments_seqops = { .show = ima_measurements_show }; +static int ima_seq_open(struct file *file, const struct seq_operations *seq_ops) +{ + struct user_namespace *user_ns = ima_user_ns_from_file(file); + struct ima_namespace *ns = user_ns->ima_ns; + struct seq_file *seq; + int err; + + err = seq_open(file, seq_ops); + if (err) + return err; + + seq = file->private_data; + seq->private = ns; + + return 0; +} + static int ima_measurements_open(struct inode *inode, struct file *file) { - return seq_open(file, &ima_measurments_seqops); + return ima_seq_open(file, &ima_measurments_seqops); } static const struct file_operations ima_measurements_ops = { @@ -263,7 +296,7 @@ static const struct seq_operations ima_ascii_measurements_seqops = { static int ima_ascii_measurements_open(struct inode *inode, struct file *file) { - return seq_open(file, &ima_ascii_measurements_seqops); + return ima_seq_open(file, &ima_ascii_measurements_seqops); } static const struct file_operations ima_ascii_measurements_ops = { @@ -273,9 +306,8 @@ static const struct file_operations ima_ascii_measurements_ops = { .release = seq_release, }; -static ssize_t ima_read_policy(char *path) +static ssize_t ima_read_policy(struct ima_namespace *ns, char *path) { - struct ima_namespace *ns = get_current_ns(); void *data = NULL; char *datap; size_t size; @@ -314,10 +346,23 @@ static ssize_t ima_read_policy(char *path) return pathlen; } +static struct ima_namespace *ima_filp_private(struct file *filp) +{ + if (!(filp->f_flags & O_WRONLY)) { +#ifdef CONFIG_IMA_READ_POLICY + struct seq_file *seq; + + seq = filp->private_data; + return seq->private; +#endif + } + return filp->private_data; +} + static ssize_t ima_write_policy(struct file *file, const char __user *buf, size_t datalen, loff_t *ppos) { - struct ima_namespace *ns = get_current_ns(); + struct ima_namespace *ns = ima_filp_private(file); char *data; ssize_t result; @@ -340,7 +385,7 @@ static ssize_t ima_write_policy(struct file *file, const char __user *buf, goto out_free; if (data[0] == '/') { - result = ima_read_policy(data); + result = ima_read_policy(ns, data); } else if (ima_appraise & IMA_APPRAISE_POLICY) { pr_err("signed policy file (specified as an absolute pathname) required\n"); integrity_audit_msg(AUDIT_INTEGRITY_STATUS, NULL, NULL, @@ -386,7 +431,8 @@ static const struct seq_operations ima_policy_seqops = { */ static int ima_open_policy(struct inode *inode, struct file *filp) { - struct ima_namespace *ns = get_current_ns(); + struct user_namespace *user_ns = ima_user_ns_from_file(filp); + struct ima_namespace *ns = user_ns->ima_ns; if (!(filp->f_flags & O_WRONLY)) { #ifndef CONFIG_IMA_READ_POLICY @@ -396,11 +442,13 @@ static int ima_open_policy(struct inode *inode, struct file *filp) return -EACCES; if (!capable(CAP_SYS_ADMIN)) return -EPERM; - return seq_open(filp, &ima_policy_seqops); + return ima_seq_open(filp, &ima_policy_seqops); #endif } if (test_and_set_bit(IMA_FS_BUSY, &ns->ima_fs_flags)) return -EBUSY; + + filp->private_data = ns; return 0; } @@ -413,7 +461,7 @@ static int ima_open_policy(struct inode *inode, struct file *filp) */ static int ima_release_policy(struct inode *inode, struct file *file) { - struct ima_namespace *ns = get_current_ns(); + struct ima_namespace *ns = ima_filp_private(file); const char *cause = ns->valid_policy ? "completed" : "failed"; if ((file->f_flags & O_ACCMODE) == O_RDONLY) diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c index 747dca6131d6..c2acd4cf529d 100644 --- a/security/integrity/ima/ima_policy.c +++ b/security/integrity/ima/ima_policy.c @@ -1908,7 +1908,7 @@ static const char *const mask_tokens[] = { void *ima_policy_start(struct seq_file *m, loff_t *pos) { - struct ima_namespace *ns = get_current_ns(); + struct ima_namespace *ns = m->private; loff_t l = *pos; struct ima_rule_entry *entry; struct list_head *ima_rules_tmp; @@ -1928,7 +1928,7 @@ void *ima_policy_start(struct seq_file *m, loff_t *pos) void *ima_policy_next(struct seq_file *m, void *v, loff_t *pos) { struct ima_rule_entry *entry = v; - struct ima_namespace *ns = get_current_ns(); + struct ima_namespace *ns = m->private; rcu_read_lock(); entry = list_entry_rcu(entry->list.next, struct ima_rule_entry, list); -- 2.31.1