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authorCong Wang <xiyou.wangcong@gmail.com>2020-05-02 22:22:19 -0700
committerDavid S. Miller <davem@davemloft.net>2020-05-04 12:05:56 -0700
commit1a33e10e4a95cb109ff1145098175df3113313ef (patch)
treea903d8645954f9d50e03c3f0b8a25479ec2f6985 /net
parentea84c842900872f5b8d6d4754cf0fa37d6672011 (diff)
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net: partially revert dynamic lockdep key changes
This patch reverts the folowing commits: commit 064ff66e2bef84f1153087612032b5b9eab005bd "bonding: add missing netdev_update_lockdep_key()" commit 53d374979ef147ab51f5d632dfe20b14aebeccd0 "net: avoid updating qdisc_xmit_lock_key in netdev_update_lockdep_key()" commit 1f26c0d3d24125992ab0026b0dab16c08df947c7 "net: fix kernel-doc warning in <linux/netdevice.h>" commit ab92d68fc22f9afab480153bd82a20f6e2533769 "net: core: add generic lockdep keys" but keeps the addr_list_lock_key because we still lock addr_list_lock nestedly on stack devices, unlikely xmit_lock this is safe because we don't take addr_list_lock on any fast path. Reported-and-tested-by: syzbot+aaa6fa4949cc5d9b7b25@syzkaller.appspotmail.com Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Taehee Yoo <ap420073@gmail.com> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Acked-by: Taehee Yoo <ap420073@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/8021q/vlan_dev.c21
-rw-r--r--net/batman-adv/soft-interface.c30
-rw-r--r--net/bluetooth/6lowpan.c8
-rw-r--r--net/core/dev.c90
-rw-r--r--net/dsa/slave.c12
-rw-r--r--net/ieee802154/6lowpan/core.c8
-rw-r--r--net/l2tp/l2tp_eth.c1
-rw-r--r--net/netrom/af_netrom.c21
-rw-r--r--net/rose/af_rose.c21
-rw-r--r--net/sched/sch_generic.c17
10 files changed, 204 insertions, 25 deletions
diff --git a/net/8021q/vlan_dev.c b/net/8021q/vlan_dev.c
index 990b9fde28c6..319220b2341d 100644
--- a/net/8021q/vlan_dev.c
+++ b/net/8021q/vlan_dev.c
@@ -489,6 +489,25 @@ static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
dev_uc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
}
+/*
+ * vlan network devices have devices nesting below it, and are a special
+ * "super class" of normal network devices; split their locks off into a
+ * separate class since they always nest.
+ */
+static struct lock_class_key vlan_netdev_xmit_lock_key;
+
+static void vlan_dev_set_lockdep_one(struct net_device *dev,
+ struct netdev_queue *txq,
+ void *unused)
+{
+ lockdep_set_class(&txq->_xmit_lock, &vlan_netdev_xmit_lock_key);
+}
+
+static void vlan_dev_set_lockdep_class(struct net_device *dev)
+{
+ netdev_for_each_tx_queue(dev, vlan_dev_set_lockdep_one, NULL);
+}
+
static const struct header_ops vlan_header_ops = {
.create = vlan_dev_hard_header,
.parse = eth_header_parse,
@@ -579,6 +598,8 @@ static int vlan_dev_init(struct net_device *dev)
SET_NETDEV_DEVTYPE(dev, &vlan_type);
+ vlan_dev_set_lockdep_class(dev);
+
vlan->vlan_pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
if (!vlan->vlan_pcpu_stats)
return -ENOMEM;
diff --git a/net/batman-adv/soft-interface.c b/net/batman-adv/soft-interface.c
index 5f05a728f347..822af540b854 100644
--- a/net/batman-adv/soft-interface.c
+++ b/net/batman-adv/soft-interface.c
@@ -739,6 +739,34 @@ static int batadv_interface_kill_vid(struct net_device *dev, __be16 proto,
return 0;
}
+/* batman-adv network devices have devices nesting below it and are a special
+ * "super class" of normal network devices; split their locks off into a
+ * separate class since they always nest.
+ */
+static struct lock_class_key batadv_netdev_xmit_lock_key;
+
+/**
+ * batadv_set_lockdep_class_one() - Set lockdep class for a single tx queue
+ * @dev: device which owns the tx queue
+ * @txq: tx queue to modify
+ * @_unused: always NULL
+ */
+static void batadv_set_lockdep_class_one(struct net_device *dev,
+ struct netdev_queue *txq,
+ void *_unused)
+{
+ lockdep_set_class(&txq->_xmit_lock, &batadv_netdev_xmit_lock_key);
+}
+
+/**
+ * batadv_set_lockdep_class() - Set txq and addr_list lockdep class
+ * @dev: network device to modify
+ */
+static void batadv_set_lockdep_class(struct net_device *dev)
+{
+ netdev_for_each_tx_queue(dev, batadv_set_lockdep_class_one, NULL);
+}
+
/**
* batadv_softif_init_late() - late stage initialization of soft interface
* @dev: registered network device to modify
@@ -752,6 +780,8 @@ static int batadv_softif_init_late(struct net_device *dev)
int ret;
size_t cnt_len = sizeof(u64) * BATADV_CNT_NUM;
+ batadv_set_lockdep_class(dev);
+
bat_priv = netdev_priv(dev);
bat_priv->soft_iface = dev;
diff --git a/net/bluetooth/6lowpan.c b/net/bluetooth/6lowpan.c
index 4febc82a7c76..bb55d92691b0 100644
--- a/net/bluetooth/6lowpan.c
+++ b/net/bluetooth/6lowpan.c
@@ -571,7 +571,15 @@ static netdev_tx_t bt_xmit(struct sk_buff *skb, struct net_device *netdev)
return err < 0 ? NET_XMIT_DROP : err;
}
+static int bt_dev_init(struct net_device *dev)
+{
+ netdev_lockdep_set_classes(dev);
+
+ return 0;
+}
+
static const struct net_device_ops netdev_ops = {
+ .ndo_init = bt_dev_init,
.ndo_start_xmit = bt_xmit,
};
diff --git a/net/core/dev.c b/net/core/dev.c
index afff16849c26..f8d83922a6af 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -398,6 +398,74 @@ static RAW_NOTIFIER_HEAD(netdev_chain);
DEFINE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);
EXPORT_PER_CPU_SYMBOL(softnet_data);
+#ifdef CONFIG_LOCKDEP
+/*
+ * register_netdevice() inits txq->_xmit_lock and sets lockdep class
+ * according to dev->type
+ */
+static const unsigned short netdev_lock_type[] = {
+ ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25,
+ ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET,
+ ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM,
+ ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP,
+ ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD,
+ ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25,
+ ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP,
+ ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD,
+ ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI,
+ ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE,
+ ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET,
+ ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL,
+ ARPHRD_FCFABRIC, ARPHRD_IEEE80211, ARPHRD_IEEE80211_PRISM,
+ ARPHRD_IEEE80211_RADIOTAP, ARPHRD_PHONET, ARPHRD_PHONET_PIPE,
+ ARPHRD_IEEE802154, ARPHRD_VOID, ARPHRD_NONE};
+
+static const char *const netdev_lock_name[] = {
+ "_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25",
+ "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET",
+ "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM",
+ "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP",
+ "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD",
+ "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25",
+ "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP",
+ "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD",
+ "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI",
+ "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE",
+ "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET",
+ "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL",
+ "_xmit_FCFABRIC", "_xmit_IEEE80211", "_xmit_IEEE80211_PRISM",
+ "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET", "_xmit_PHONET_PIPE",
+ "_xmit_IEEE802154", "_xmit_VOID", "_xmit_NONE"};
+
+static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)];
+
+static inline unsigned short netdev_lock_pos(unsigned short dev_type)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++)
+ if (netdev_lock_type[i] == dev_type)
+ return i;
+ /* the last key is used by default */
+ return ARRAY_SIZE(netdev_lock_type) - 1;
+}
+
+static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
+ unsigned short dev_type)
+{
+ int i;
+
+ i = netdev_lock_pos(dev_type);
+ lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i],
+ netdev_lock_name[i]);
+}
+#else
+static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
+ unsigned short dev_type)
+{
+}
+#endif
+
/*******************************************************************************
*
* Protocol management and registration routines
@@ -9208,7 +9276,7 @@ static void netdev_init_one_queue(struct net_device *dev,
{
/* Initialize queue lock */
spin_lock_init(&queue->_xmit_lock);
- lockdep_set_class(&queue->_xmit_lock, &dev->qdisc_xmit_lock_key);
+ netdev_set_xmit_lockdep_class(&queue->_xmit_lock, dev->type);
queue->xmit_lock_owner = -1;
netdev_queue_numa_node_write(queue, NUMA_NO_NODE);
queue->dev = dev;
@@ -9255,22 +9323,6 @@ void netif_tx_stop_all_queues(struct net_device *dev)
}
EXPORT_SYMBOL(netif_tx_stop_all_queues);
-static void netdev_register_lockdep_key(struct net_device *dev)
-{
- lockdep_register_key(&dev->qdisc_tx_busylock_key);
- lockdep_register_key(&dev->qdisc_running_key);
- lockdep_register_key(&dev->qdisc_xmit_lock_key);
- lockdep_register_key(&dev->addr_list_lock_key);
-}
-
-static void netdev_unregister_lockdep_key(struct net_device *dev)
-{
- lockdep_unregister_key(&dev->qdisc_tx_busylock_key);
- lockdep_unregister_key(&dev->qdisc_running_key);
- lockdep_unregister_key(&dev->qdisc_xmit_lock_key);
- lockdep_unregister_key(&dev->addr_list_lock_key);
-}
-
void netdev_update_lockdep_key(struct net_device *dev)
{
lockdep_unregister_key(&dev->addr_list_lock_key);
@@ -9837,7 +9889,7 @@ struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
dev_net_set(dev, &init_net);
- netdev_register_lockdep_key(dev);
+ lockdep_register_key(&dev->addr_list_lock_key);
dev->gso_max_size = GSO_MAX_SIZE;
dev->gso_max_segs = GSO_MAX_SEGS;
@@ -9926,7 +9978,7 @@ void free_netdev(struct net_device *dev)
free_percpu(dev->xdp_bulkq);
dev->xdp_bulkq = NULL;
- netdev_unregister_lockdep_key(dev);
+ lockdep_unregister_key(&dev->addr_list_lock_key);
/* Compatibility with error handling in drivers */
if (dev->reg_state == NETREG_UNINITIALIZED) {
diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index ba8bf90dc0cc..fa2634043751 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -1671,6 +1671,15 @@ static int dsa_slave_phy_setup(struct net_device *slave_dev)
return ret;
}
+static struct lock_class_key dsa_slave_netdev_xmit_lock_key;
+static void dsa_slave_set_lockdep_class_one(struct net_device *dev,
+ struct netdev_queue *txq,
+ void *_unused)
+{
+ lockdep_set_class(&txq->_xmit_lock,
+ &dsa_slave_netdev_xmit_lock_key);
+}
+
int dsa_slave_suspend(struct net_device *slave_dev)
{
struct dsa_port *dp = dsa_slave_to_port(slave_dev);
@@ -1754,6 +1763,9 @@ int dsa_slave_create(struct dsa_port *port)
slave_dev->max_mtu = ETH_MAX_MTU;
SET_NETDEV_DEVTYPE(slave_dev, &dsa_type);
+ netdev_for_each_tx_queue(slave_dev, dsa_slave_set_lockdep_class_one,
+ NULL);
+
SET_NETDEV_DEV(slave_dev, port->ds->dev);
slave_dev->dev.of_node = port->dn;
slave_dev->vlan_features = master->vlan_features;
diff --git a/net/ieee802154/6lowpan/core.c b/net/ieee802154/6lowpan/core.c
index c0b107cdd715..3297e7fa9945 100644
--- a/net/ieee802154/6lowpan/core.c
+++ b/net/ieee802154/6lowpan/core.c
@@ -58,6 +58,13 @@ static const struct header_ops lowpan_header_ops = {
.create = lowpan_header_create,
};
+static int lowpan_dev_init(struct net_device *ldev)
+{
+ netdev_lockdep_set_classes(ldev);
+
+ return 0;
+}
+
static int lowpan_open(struct net_device *dev)
{
if (!open_count)
@@ -89,6 +96,7 @@ static int lowpan_get_iflink(const struct net_device *dev)
}
static const struct net_device_ops lowpan_netdev_ops = {
+ .ndo_init = lowpan_dev_init,
.ndo_start_xmit = lowpan_xmit,
.ndo_open = lowpan_open,
.ndo_stop = lowpan_stop,
diff --git a/net/l2tp/l2tp_eth.c b/net/l2tp/l2tp_eth.c
index d3b520b9b2c9..fd5ac2788e45 100644
--- a/net/l2tp/l2tp_eth.c
+++ b/net/l2tp/l2tp_eth.c
@@ -56,6 +56,7 @@ static int l2tp_eth_dev_init(struct net_device *dev)
{
eth_hw_addr_random(dev);
eth_broadcast_addr(dev->broadcast);
+ netdev_lockdep_set_classes(dev);
return 0;
}
diff --git a/net/netrom/af_netrom.c b/net/netrom/af_netrom.c
index 7b1a74f74aad..eccc7d366e17 100644
--- a/net/netrom/af_netrom.c
+++ b/net/netrom/af_netrom.c
@@ -64,6 +64,26 @@ static DEFINE_SPINLOCK(nr_list_lock);
static const struct proto_ops nr_proto_ops;
/*
+ * NETROM network devices are virtual network devices encapsulating NETROM
+ * frames into AX.25 which will be sent through an AX.25 device, so form a
+ * special "super class" of normal net devices; split their locks off into a
+ * separate class since they always nest.
+ */
+static struct lock_class_key nr_netdev_xmit_lock_key;
+
+static void nr_set_lockdep_one(struct net_device *dev,
+ struct netdev_queue *txq,
+ void *_unused)
+{
+ lockdep_set_class(&txq->_xmit_lock, &nr_netdev_xmit_lock_key);
+}
+
+static void nr_set_lockdep_key(struct net_device *dev)
+{
+ netdev_for_each_tx_queue(dev, nr_set_lockdep_one, NULL);
+}
+
+/*
* Socket removal during an interrupt is now safe.
*/
static void nr_remove_socket(struct sock *sk)
@@ -1394,6 +1414,7 @@ static int __init nr_proto_init(void)
free_netdev(dev);
goto fail;
}
+ nr_set_lockdep_key(dev);
dev_nr[i] = dev;
}
diff --git a/net/rose/af_rose.c b/net/rose/af_rose.c
index 1e8eeb044b07..e7a872207b46 100644
--- a/net/rose/af_rose.c
+++ b/net/rose/af_rose.c
@@ -65,6 +65,26 @@ static const struct proto_ops rose_proto_ops;
ax25_address rose_callsign;
/*
+ * ROSE network devices are virtual network devices encapsulating ROSE
+ * frames into AX.25 which will be sent through an AX.25 device, so form a
+ * special "super class" of normal net devices; split their locks off into a
+ * separate class since they always nest.
+ */
+static struct lock_class_key rose_netdev_xmit_lock_key;
+
+static void rose_set_lockdep_one(struct net_device *dev,
+ struct netdev_queue *txq,
+ void *_unused)
+{
+ lockdep_set_class(&txq->_xmit_lock, &rose_netdev_xmit_lock_key);
+}
+
+static void rose_set_lockdep_key(struct net_device *dev)
+{
+ netdev_for_each_tx_queue(dev, rose_set_lockdep_one, NULL);
+}
+
+/*
* Convert a ROSE address into text.
*/
char *rose2asc(char *buf, const rose_address *addr)
@@ -1511,6 +1531,7 @@ static int __init rose_proto_init(void)
free_netdev(dev);
goto fail;
}
+ rose_set_lockdep_key(dev);
dev_rose[i] = dev;
}
diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c
index ad24fa1a51e6..ebc55d884247 100644
--- a/net/sched/sch_generic.c
+++ b/net/sched/sch_generic.c
@@ -794,6 +794,9 @@ struct Qdisc_ops pfifo_fast_ops __read_mostly = {
};
EXPORT_SYMBOL(pfifo_fast_ops);
+static struct lock_class_key qdisc_tx_busylock;
+static struct lock_class_key qdisc_running_key;
+
struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
const struct Qdisc_ops *ops,
struct netlink_ext_ack *extack)
@@ -846,9 +849,17 @@ struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
}
spin_lock_init(&sch->busylock);
+ lockdep_set_class(&sch->busylock,
+ dev->qdisc_tx_busylock ?: &qdisc_tx_busylock);
+
/* seqlock has the same scope of busylock, for NOLOCK qdisc */
spin_lock_init(&sch->seqlock);
+ lockdep_set_class(&sch->busylock,
+ dev->qdisc_tx_busylock ?: &qdisc_tx_busylock);
+
seqcount_init(&sch->running);
+ lockdep_set_class(&sch->running,
+ dev->qdisc_running_key ?: &qdisc_running_key);
sch->ops = ops;
sch->flags = ops->static_flags;
@@ -859,12 +870,6 @@ struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
dev_hold(dev);
refcount_set(&sch->refcnt, 1);
- if (sch != &noop_qdisc) {
- lockdep_set_class(&sch->busylock, &dev->qdisc_tx_busylock_key);
- lockdep_set_class(&sch->seqlock, &dev->qdisc_tx_busylock_key);
- lockdep_set_class(&sch->running, &dev->qdisc_running_key);
- }
-
return sch;
errout1:
kfree(p);