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audit: fix a net reference leak in audit_list_rules_send()

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If audit_list_rules_send() fails when trying to create a new thread
to send the rules it also fails to cleanup properly, leaking a
reference to a net structure.  This patch fixes the error patch and
renames audit_send_list() to audit_send_list_thread() to better
match its cousin, audit_send_reply_thread().

Reported-by: teroincn@gmail.com
Reviewed-by: Richard Guy Briggs <rgb@redhat.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
This commit is contained in:
Paul Moore 2020-04-21 09:10:56 -04:00
parent a48b284b40
commit 3054d06719
3 changed files with 9 additions and 11 deletions
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2
kernel/audit.c
View File

@ -880,7 +880,7 @@ static int kauditd_thread(void *dummy)
return 0; return 0;
} }
int audit_send_list(void *_dest) int audit_send_list_thread(void *_dest)
{ {
struct audit_netlink_list *dest = _dest; struct audit_netlink_list *dest = _dest;
struct sk_buff *skb; struct sk_buff *skb;

2
kernel/audit.h
View File

@ -229,7 +229,7 @@ struct audit_netlink_list {
struct sk_buff_head q; struct sk_buff_head q;
}; };
int audit_send_list(void *_dest); int audit_send_list_thread(void *_dest);
extern int selinux_audit_rule_update(void); extern int selinux_audit_rule_update(void);

16
kernel/auditfilter.c
View File

@ -1161,11 +1161,8 @@ int audit_rule_change(int type, int seq, void *data, size_t datasz)
*/ */
int audit_list_rules_send(struct sk_buff *request_skb, int seq) int audit_list_rules_send(struct sk_buff *request_skb, int seq)
{ {
u32 portid = NETLINK_CB(request_skb).portid;
struct net *net = sock_net(NETLINK_CB(request_skb).sk);
struct task_struct *tsk; struct task_struct *tsk;
struct audit_netlink_list *dest; struct audit_netlink_list *dest;
int err = 0;
/* We can't just spew out the rules here because we might fill /* We can't just spew out the rules here because we might fill
* the available socket buffer space and deadlock waiting for * the available socket buffer space and deadlock waiting for
@ -1173,25 +1170,26 @@ int audit_list_rules_send(struct sk_buff *request_skb, int seq)
* happen if we're actually running in the context of auditctl * happen if we're actually running in the context of auditctl
* trying to _send_ the stuff */ * trying to _send_ the stuff */
dest = kmalloc(sizeof(struct audit_netlink_list), GFP_KERNEL); dest = kmalloc(sizeof(*dest), GFP_KERNEL);
if (!dest) if (!dest)
return -ENOMEM; return -ENOMEM;
dest->net = get_net(net); dest->net = get_net(sock_net(NETLINK_CB(request_skb).sk));
dest->portid = portid; dest->portid = NETLINK_CB(request_skb).portid;
skb_queue_head_init(&dest->q); skb_queue_head_init(&dest->q);
mutex_lock(&audit_filter_mutex); mutex_lock(&audit_filter_mutex);
audit_list_rules(seq, &dest->q); audit_list_rules(seq, &dest->q);
mutex_unlock(&audit_filter_mutex); mutex_unlock(&audit_filter_mutex);
tsk = kthread_run(audit_send_list, dest, "audit_send_list"); tsk = kthread_run(audit_send_list_thread, dest, "audit_send_list");
if (IS_ERR(tsk)) { if (IS_ERR(tsk)) {
skb_queue_purge(&dest->q); skb_queue_purge(&dest->q);
put_net(dest->net);
kfree(dest); kfree(dest);
err = PTR_ERR(tsk); return PTR_ERR(tsk);
} }
return err; return 0;
} }
int audit_comparator(u32 left, u32 op, u32 right) int audit_comparator(u32 left, u32 op, u32 right)