race of lockd inetaddr notifiers vs nlmsvc_rqst change
lockd_inet[6]addr_event use nlmsvc_rqst without taken nlmsvc_mutex,
nlmsvc_rqst can be changed during execution of notifiers and crash the host.
Patch enables access to nlmsvc_rqst only when it was correctly initialized
and delays its cleanup until notifiers are no longer in use.
Note that nlmsvc_rqst can be temporally set to ERR_PTR, so the "if
(nlmsvc_rqst)" check in notifiers is insufficient on its own.
Signed-off-by: Vasily Averin <vvs@virtuozzo.com>
Tested-by: Scott Mayhew <smayhew@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
diff --git a/fs/lockd/svc.c b/fs/lockd/svc.c
index 4acf0eb..9c36d61 100644
--- a/fs/lockd/svc.c
+++ b/fs/lockd/svc.c
@@ -57,6 +57,9 @@
static struct svc_rqst *nlmsvc_rqst;
unsigned long nlmsvc_timeout;
+atomic_t nlm_ntf_refcnt = ATOMIC_INIT(0);
+DECLARE_WAIT_QUEUE_HEAD(nlm_ntf_wq);
+
unsigned int lockd_net_id;
/*
@@ -293,7 +296,8 @@
struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
struct sockaddr_in sin;
- if (event != NETDEV_DOWN)
+ if ((event != NETDEV_DOWN) ||
+ !atomic_inc_not_zero(&nlm_ntf_refcnt))
goto out;
if (nlmsvc_rqst) {
@@ -304,6 +308,8 @@
svc_age_temp_xprts_now(nlmsvc_rqst->rq_server,
(struct sockaddr *)&sin);
}
+ atomic_dec(&nlm_ntf_refcnt);
+ wake_up(&nlm_ntf_wq);
out:
return NOTIFY_DONE;
@@ -320,7 +326,8 @@
struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr;
struct sockaddr_in6 sin6;
- if (event != NETDEV_DOWN)
+ if ((event != NETDEV_DOWN) ||
+ !atomic_inc_not_zero(&nlm_ntf_refcnt))
goto out;
if (nlmsvc_rqst) {
@@ -332,6 +339,8 @@
svc_age_temp_xprts_now(nlmsvc_rqst->rq_server,
(struct sockaddr *)&sin6);
}
+ atomic_dec(&nlm_ntf_refcnt);
+ wake_up(&nlm_ntf_wq);
out:
return NOTIFY_DONE;
@@ -348,10 +357,12 @@
#if IS_ENABLED(CONFIG_IPV6)
unregister_inet6addr_notifier(&lockd_inet6addr_notifier);
#endif
+ wait_event(nlm_ntf_wq, atomic_read(&nlm_ntf_refcnt) == 0);
}
static void lockd_svc_exit_thread(void)
{
+ atomic_dec(&nlm_ntf_refcnt);
lockd_unregister_notifiers();
svc_exit_thread(nlmsvc_rqst);
}
@@ -376,6 +387,7 @@
goto out_rqst;
}
+ atomic_inc(&nlm_ntf_refcnt);
svc_sock_update_bufs(serv);
serv->sv_maxconn = nlm_max_connections;