[PATCH V7 07/10] audit: dump namespace IDs for pid on receipt of AUDIT_NS_INFO

[Richard Guy Briggs]

When a task with CAP_AUDIT_CONTROL sends a NETLINK_AUDIT message of type
UDIT_NS_INFO with a PID of interest formatted as pid_t as the first and only
data, dump the namespace IDs of that task to the audit log.

Signed-off-by: Richard Guy Briggs <rgb@xxxxxxxxxx>
---
 kernel/audit.c |   17 +++++++++++++++++
 1 files changed, 17 insertions(+), 0 deletions(-)

diff --git a/kernel/audit.c b/kernel/audit.c
index 229fd5a..af143b5 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -662,6 +662,7 @@ static int audit_netlink_ok(struct sk_buff *skb, u16 msg_type)
 	case AUDIT_TTY_SET:
 	case AUDIT_TRIM:
 	case AUDIT_MAKE_EQUIV:
+	case AUDIT_NS_INFO:
 		/* Only support auditd and auditctl in initial pid namespace
 		 * for now. */
 		if ((task_active_pid_ns(current) != &init_pid_ns))
@@ -1057,6 +1058,22 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
 		audit_log_end(ab);
 		break;
 	}
+	case AUDIT_NS_INFO:
+#ifdef CONFIG_NAMESPACES
+	{
+		struct task_struct *tsk;
+
+		rcu_read_lock();
+		tsk = find_task_by_vpid(*(pid_t *)data);
+		rcu_read_unlock();
+		if (tsk)
+			audit_log_ns_info(tsk);
+		else
+			err = -EINVAL;
+	}
+#else /* CONFIG_NAMESPACES */
+		err = -EOPNOTSUPP;
+#endif /* CONFIG_NAMESPACES */
 	default:
 		err = -EINVAL;
 		break;
-- 
1.7.1

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