[PATCH 5/5] audit: allow user processes to log from another PID namespace

[Richard Guy Briggs]

Still only permit the audit logging daemon and control to operate from the
initial PID namespace, but allow processes to log from another PID namespace.

Cc: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
(informed by ebiederman's c776b5d2)

Signed-off-by: Richard Guy Briggs <rgb@xxxxxxxxxx>
---
 kernel/audit.c |   10 +++++++---
 1 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/kernel/audit.c b/kernel/audit.c
index 6d33246..4cd4011 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -606,9 +606,8 @@ static int audit_netlink_ok(struct sk_buff *skb, u16 msg_type)
 {
 	int err = 0;
 
-	/* Only support the initial namespaces for now. */
-	if ((current_user_ns() != &init_user_ns) ||
-	    (task_active_pid_ns(current) != &init_pid_ns))
+	/* Only support initial user namespace for now. */
+	if ((current_user_ns() != &init_user_ns))
 		return -EPERM;
 
 	switch (msg_type) {
@@ -628,6 +627,11 @@ static int audit_netlink_ok(struct sk_buff *skb, u16 msg_type)
 	case AUDIT_TTY_SET:
 	case AUDIT_TRIM:
 	case AUDIT_MAKE_EQUIV:
+		/* Only support auditd and auditctl in initial pid namespace
+		 * for now. */
+		if ((task_active_pid_ns(current) != &init_pid_ns))
+			return -EPERM;
+
 		if (!capable(CAP_AUDIT_CONTROL))
 			err = -EPERM;
 		break;
-- 
1.7.1

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