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Subject[PATCH V6 09/10] audit: log on switching namespace (setns)
Date
Added six new audit message types, AUDIT_NS_SET_* and function
audit_log_ns_set() to log a switch of namespace.

Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
---
include/linux/audit.h | 4 +++
include/uapi/linux/audit.h | 6 +++++
kernel/audit.c | 52 ++++++++++++++++++++++++++++++++++++++++++++
kernel/nsproxy.c | 3 ++
4 files changed, 65 insertions(+), 0 deletions(-)

diff --git a/include/linux/audit.h b/include/linux/audit.h
index b28dfb0..c71c819 100644
--- a/include/linux/audit.h
+++ b/include/linux/audit.h
@@ -26,6 +26,7 @@
#include <linux/sched.h>
#include <linux/ptrace.h>
#include <uapi/linux/audit.h>
+#include <linux/proc_ns.h>

struct audit_sig_info {
uid_t uid;
@@ -487,6 +488,7 @@ static inline void audit_log_ns_info(struct task_struct *tsk)
extern void audit_log_ns_init(int type, unsigned int old_inum,
unsigned int inum);
extern void audit_log_ns_del(int type, unsigned int inum);
+extern void audit_log_ns_set(const struct proc_ns_operations *ops, void *ns);

extern int audit_update_lsm_rules(void);

@@ -550,6 +552,8 @@ static inline int audit_log_ns_init(int type, unsigned int old_inum,
{ }
static inline int audit_log_ns_del(int type, unsigned int inum)
{ }
+static inline void audit_log_ns_set(const struct proc_ns_operations *ops, void *ns)
+{ }
#define audit_enabled 0
#endif /* CONFIG_AUDIT */
static inline void audit_log_string(struct audit_buffer *ab, const char *buf)
diff --git a/include/uapi/linux/audit.h b/include/uapi/linux/audit.h
index 487cad6..567b45f 100644
--- a/include/uapi/linux/audit.h
+++ b/include/uapi/linux/audit.h
@@ -123,6 +123,12 @@
#define AUDIT_NS_DEL_USER 1339 /* Record USER namespace instance deletion */
#define AUDIT_NS_DEL_PID 1340 /* Record PID namespace instance deletion */
#define AUDIT_NS_DEL_NET 1341 /* Record NET namespace instance deletion */
+#define AUDIT_NS_SET_MNT 1342 /* Record mount namespace instance deletion */
+#define AUDIT_NS_SET_UTS 1343 /* Record UTS namespace instance deletion */
+#define AUDIT_NS_SET_IPC 1344 /* Record IPC namespace instance deletion */
+#define AUDIT_NS_SET_USER 1345 /* Record USER namespace instance deletion */
+#define AUDIT_NS_SET_PID 1346 /* Record PID namespace instance deletion */
+#define AUDIT_NS_SET_NET 1347 /* Record NET namespace instance deletion */

#define AUDIT_AVC 1400 /* SE Linux avc denial or grant */
#define AUDIT_SELINUX_ERR 1401 /* Internal SE Linux Errors */
diff --git a/kernel/audit.c b/kernel/audit.c
index b7f10e9..a7b1b61 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -2054,6 +2054,58 @@ void audit_log_ns_del(int type, unsigned int inum)
inum - PROC_DYNAMIC_FIRST);
audit_log_end(ab);
}
+
+/**
+ * audit_log_ns_set - report a namespace set change
+ * @ops: the ops structure for the namespace to be changed
+ * @ns: the new namespace
+ */
+void audit_log_ns_set(const struct proc_ns_operations *ops, void *ns)
+{
+ struct audit_buffer *ab;
+ void *old_ns;
+ int msg_type;
+ struct vfsmount *mnt = task_active_pid_ns(current)->proc_mnt;
+ struct super_block *sb = mnt->mnt_sb;
+ char old_ns_s[16];
+
+ switch (ops->type) {
+ case CLONE_NEWNS:
+ msg_type = AUDIT_NS_SET_MNT;
+ break;
+ case CLONE_NEWUTS:
+ msg_type = AUDIT_NS_SET_UTS;
+ break;
+ case CLONE_NEWIPC:
+ msg_type = AUDIT_NS_SET_IPC;
+ break;
+ case CLONE_NEWUSER:
+ msg_type = AUDIT_NS_SET_USER;
+ break;
+ case CLONE_NEWPID:
+ msg_type = AUDIT_NS_SET_PID;
+ break;
+ case CLONE_NEWNET:
+ msg_type = AUDIT_NS_SET_NET;
+ break;
+ default:
+ return;
+ }
+ audit_log_common_recv_msg(&ab, ops->type);
+ if (!ab)
+ return;
+ old_ns = ops->get(current);
+ if (!ops->inum(old_ns))
+ sprintf(old_ns_s, "(none)");
+ else
+ sprintf(old_ns_s, "%d", ops->inum(old_ns) - PROC_DYNAMIC_FIRST);
+ audit_log_format(ab, " dev=%02x:%02x old_%sns=%s %sns=%d res=1",
+ MAJOR(sb->s_dev), MINOR(sb->s_dev),
+ ops->name, old_ns_s,
+ ops->name, ops->inum(ns));
+ ops->put(old_ns);
+ audit_log_end(ab);
+}
#endif /* CONFIG_NAMESPACES */

/**
diff --git a/kernel/nsproxy.c b/kernel/nsproxy.c
index d5353c2..2ca86cf 100644
--- a/kernel/nsproxy.c
+++ b/kernel/nsproxy.c
@@ -257,6 +257,9 @@ SYSCALL_DEFINE2(setns, int, fd, int, nstype)
goto out;
}
switch_task_namespaces(tsk, new_nsproxy);
+
+ audit_log_ns_set(ops, ei->ns);
+
out:
fput(file);
return err;
--
1.7.1


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