[PATCH 07/20] aduit: make audit_nlk_portid per audit namespace

Gao feng
2013-10-24T07:31:52Z

We should use audit_nlk_portid to decide to send
audit netlink message to which auditd processes.
it should be per audit namespace too.

Signed-off-by: Gao feng <gaofeng@cn.fujitsu.com>
---
include/linux/audit_namespace.h | 2 ++
kernel/audit.c | 14 ++++----------
2 files changed, 6 insertions(+), 10 deletions(-)

diff --git a/include/linux/audit_namespace.h b/include/linux/audit_namespace.h
index 2c0eede..a9e6a40 100644
--- a/include/linux/audit_namespace.h
+++ b/include/linux/audit_namespace.h
@@ -11,6 +11,8 @@ struct audit_namespace {
atomic_t count;
/* pid of the auditd process */
int pid;
+ /* portid of the auditd process's netlink socket */
+ int portid;
struct user_namespace *user_ns;
struct sk_buff_head queue;
/* queue of skbs to send to auditd when/if it comes back */
diff --git a/kernel/audit.c b/kernel/audit.c
index ceb1cbd..37375fb 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -89,13 +89,6 @@ static int audit_default;
/* If auditing cannot proceed, audit_failure selects what happens. */
static int audit_failure = AUDIT_FAIL_PRINTK;

-/*
- * If audit records are to be written to the netlink socket, audit_pid
- * contains the pid of the auditd process and audit_nlk_portid contains
- * the portid to use to send netlink messages to that process.
- */
-static int audit_nlk_portid;
-
/* If audit_rate_limit is non-zero, limit the rate of sending audit records
* to that number per second. This prevents DoS attacks, but results in
* audit records being dropped. */
@@ -381,7 +374,7 @@ static void kauditd_send_skb(struct sk_buff *skb)
int err;
/* take a reference in case we can't send it and we want to hold it */
skb_get(skb);
- err = netlink_unicast(audit_sock, skb, audit_nlk_portid, 0);
+ err = netlink_unicast(audit_sock, skb, init_audit_ns.portid, 0);
if (err < 0) {
BUG_ON(err != -ECONNREFUSED); /* Shouldn't happen */
printk(KERN_ERR "audit: *NO* daemon at audit_pid=%d\n", init_audit_ns.pid);
@@ -645,7 +638,7 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
u16 msg_type = nlh->nlmsg_type;
struct audit_sig_info *sig_data;
char *ctx = NULL;
- struct audit_namespace *ns = current_audit_ns();
+ struct audit_namespace *ns = current->nsproxy->audit_ns;
u32 len;

err = audit_netlink_ok(skb, msg_type);
@@ -721,7 +714,7 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
init_audit_ns.pid = new_pid;
rcu_read_unlock();

- audit_nlk_portid = NETLINK_CB(skb).portid;
+ init_audit_ns.portid = NETLINK_CB(skb).portid;
}
if (status_get->mask & AUDIT_STATUS_RATE_LIMIT) {
err = audit_set_rate_limit(status_get->rate_limit);
@@ -944,6 +937,7 @@ static int __init audit_init(void)
audit_sock->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;

init_audit_ns.pid = 0;
+ init_audit_ns.portid = 0;
init_audit_ns.kauditd_task = NULL;
skb_queue_head_init(&init_audit_ns.queue);
skb_queue_head_init(&init_audit_ns.hold_queue);
--
1.8.3.1