From: Marc Kleine-Budde <mkl@pengutronix.de>
To: linux-can@vger.kernel.org
Cc: kernel@pengutronix.de,
Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>,
linux-stable <stable@vger.kernel.org>,
syzbot <syzbot+355f8edb2ff45d5f95fa@syzkaller.appspotmail.com>,
syzbot <syzbot+0f1827363a305f74996f@syzkaller.appspotmail.com>,
Kirill Tkhai <ktkhai@virtuozzo.com>,
Oliver Hartkopp <socketcan@hartkopp.net>,
Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>,
Marc Kleine-Budde <mkl@pengutronix.de>
Subject: [PATCH] can: bcm/raw/isotp: use per module netdevice notifier
Date: Mon, 21 Jun 2021 13:58:20 +0200 [thread overview]
Message-ID: <20210621115820.2894966-1-mkl@pengutronix.de> (raw)
In-Reply-To: <1624271915233178@kroah.com>
From: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
commit 8d0caedb759683041d9db82069937525999ada53 upstream
syzbot is reporting hung task at register_netdevice_notifier() [1] and
unregister_netdevice_notifier() [2], for cleanup_net() might perform
time consuming operations while CAN driver's raw/bcm/isotp modules are
calling {register,unregister}_netdevice_notifier() on each socket.
Change raw/bcm/isotp modules to call register_netdevice_notifier() from
module's __init function and call unregister_netdevice_notifier() from
module's __exit function, as with gw/j1939 modules are doing.
Link: https://syzkaller.appspot.com/bug?id=391b9498827788b3cc6830226d4ff5be87107c30 [1]
Link: https://syzkaller.appspot.com/bug?id=1724d278c83ca6e6df100a2e320c10d991cf2bce [2]
Link: https://lore.kernel.org/r/54a5f451-05ed-f977-8534-79e7aa2bcc8f@i-love.sakura.ne.jp
Cc: linux-stable <stable@vger.kernel.org>
Reported-by: syzbot <syzbot+355f8edb2ff45d5f95fa@syzkaller.appspotmail.com>
Reported-by: syzbot <syzbot+0f1827363a305f74996f@syzkaller.appspotmail.com>
Reviewed-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Tested-by: syzbot <syzbot+355f8edb2ff45d5f95fa@syzkaller.appspotmail.com>
Tested-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
[mkl: ported to v4.9.273]
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
Hello Greg,
this is a backport of
| 8d0caedb7596 can: bcm/raw/isotp: use per module netdevice notifier
to v4.9.273. Please apply.
regards,
Marc
net/can/bcm.c | 61 +++++++++++++++++++++++++++++++++++++++-----------
net/can/raw.c | 62 +++++++++++++++++++++++++++++++++++++++------------
2 files changed, 96 insertions(+), 27 deletions(-)
diff --git a/net/can/bcm.c b/net/can/bcm.c
index c99e7c75eeee..6af1c43cf258 100644
--- a/net/can/bcm.c
+++ b/net/can/bcm.c
@@ -127,7 +127,7 @@ struct bcm_sock {
struct sock sk;
int bound;
int ifindex;
- struct notifier_block notifier;
+ struct list_head notifier;
struct list_head rx_ops;
struct list_head tx_ops;
unsigned long dropped_usr_msgs;
@@ -135,6 +135,10 @@ struct bcm_sock {
char procname [32]; /* inode number in decimal with \0 */
};
+static LIST_HEAD(bcm_notifier_list);
+static DEFINE_SPINLOCK(bcm_notifier_lock);
+static struct bcm_sock *bcm_busy_notifier;
+
static inline struct bcm_sock *bcm_sk(const struct sock *sk)
{
return (struct bcm_sock *)sk;
@@ -1436,20 +1440,15 @@ static int bcm_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
/*
* notification handler for netdevice status changes
*/
-static int bcm_notifier(struct notifier_block *nb, unsigned long msg,
- void *ptr)
+static void bcm_notify(struct bcm_sock *bo, unsigned long msg,
+ struct net_device *dev)
{
- struct net_device *dev = netdev_notifier_info_to_dev(ptr);
- struct bcm_sock *bo = container_of(nb, struct bcm_sock, notifier);
struct sock *sk = &bo->sk;
struct bcm_op *op;
int notify_enodev = 0;
if (!net_eq(dev_net(dev), &init_net))
- return NOTIFY_DONE;
-
- if (dev->type != ARPHRD_CAN)
- return NOTIFY_DONE;
+ return;
switch (msg) {
@@ -1484,7 +1483,28 @@ static int bcm_notifier(struct notifier_block *nb, unsigned long msg,
sk->sk_error_report(sk);
}
}
+}
+static int bcm_notifier(struct notifier_block *nb, unsigned long msg,
+ void *ptr)
+{
+ struct net_device *dev = netdev_notifier_info_to_dev(ptr);
+
+ if (dev->type != ARPHRD_CAN)
+ return NOTIFY_DONE;
+ if (msg != NETDEV_UNREGISTER && msg != NETDEV_DOWN)
+ return NOTIFY_DONE;
+ if (unlikely(bcm_busy_notifier)) /* Check for reentrant bug. */
+ return NOTIFY_DONE;
+
+ spin_lock(&bcm_notifier_lock);
+ list_for_each_entry(bcm_busy_notifier, &bcm_notifier_list, notifier) {
+ spin_unlock(&bcm_notifier_lock);
+ bcm_notify(bcm_busy_notifier, msg, dev);
+ spin_lock(&bcm_notifier_lock);
+ }
+ bcm_busy_notifier = NULL;
+ spin_unlock(&bcm_notifier_lock);
return NOTIFY_DONE;
}
@@ -1504,9 +1524,9 @@ static int bcm_init(struct sock *sk)
INIT_LIST_HEAD(&bo->rx_ops);
/* set notifier */
- bo->notifier.notifier_call = bcm_notifier;
-
- register_netdevice_notifier(&bo->notifier);
+ spin_lock(&bcm_notifier_lock);
+ list_add_tail(&bo->notifier, &bcm_notifier_list);
+ spin_unlock(&bcm_notifier_lock);
return 0;
}
@@ -1527,7 +1547,14 @@ static int bcm_release(struct socket *sock)
/* remove bcm_ops, timer, rx_unregister(), etc. */
- unregister_netdevice_notifier(&bo->notifier);
+ spin_lock(&bcm_notifier_lock);
+ while (bcm_busy_notifier == bo) {
+ spin_unlock(&bcm_notifier_lock);
+ schedule_timeout_uninterruptible(1);
+ spin_lock(&bcm_notifier_lock);
+ }
+ list_del(&bo->notifier);
+ spin_unlock(&bcm_notifier_lock);
lock_sock(sk);
@@ -1713,6 +1740,10 @@ static const struct can_proto bcm_can_proto = {
.prot = &bcm_proto,
};
+static struct notifier_block canbcm_notifier = {
+ .notifier_call = bcm_notifier
+};
+
static int __init bcm_module_init(void)
{
int err;
@@ -1727,6 +1758,8 @@ static int __init bcm_module_init(void)
/* create /proc/net/can-bcm directory */
proc_dir = proc_mkdir("can-bcm", init_net.proc_net);
+ register_netdevice_notifier(&canbcm_notifier);
+
return 0;
}
@@ -1736,6 +1769,8 @@ static void __exit bcm_module_exit(void)
if (proc_dir)
remove_proc_entry("can-bcm", init_net.proc_net);
+
+ unregister_netdevice_notifier(&canbcm_notifier);
}
module_init(bcm_module_init);
diff --git a/net/can/raw.c b/net/can/raw.c
index 6dc546a06673..2bb50b1535c2 100644
--- a/net/can/raw.c
+++ b/net/can/raw.c
@@ -84,7 +84,7 @@ struct raw_sock {
struct sock sk;
int bound;
int ifindex;
- struct notifier_block notifier;
+ struct list_head notifier;
int loopback;
int recv_own_msgs;
int fd_frames;
@@ -96,6 +96,10 @@ struct raw_sock {
struct uniqframe __percpu *uniq;
};
+static LIST_HEAD(raw_notifier_list);
+static DEFINE_SPINLOCK(raw_notifier_lock);
+static struct raw_sock *raw_busy_notifier;
+
/*
* Return pointer to store the extra msg flags for raw_recvmsg().
* We use the space of one unsigned int beyond the 'struct sockaddr_can'
@@ -260,21 +264,16 @@ static int raw_enable_allfilters(struct net_device *dev, struct sock *sk)
return err;
}
-static int raw_notifier(struct notifier_block *nb,
- unsigned long msg, void *ptr)
+static void raw_notify(struct raw_sock *ro, unsigned long msg,
+ struct net_device *dev)
{
- struct net_device *dev = netdev_notifier_info_to_dev(ptr);
- struct raw_sock *ro = container_of(nb, struct raw_sock, notifier);
struct sock *sk = &ro->sk;
if (!net_eq(dev_net(dev), &init_net))
- return NOTIFY_DONE;
-
- if (dev->type != ARPHRD_CAN)
- return NOTIFY_DONE;
+ return;
if (ro->ifindex != dev->ifindex)
- return NOTIFY_DONE;
+ return;
switch (msg) {
@@ -303,7 +302,28 @@ static int raw_notifier(struct notifier_block *nb,
sk->sk_error_report(sk);
break;
}
+}
+
+static int raw_notifier(struct notifier_block *nb, unsigned long msg,
+ void *ptr)
+{
+ struct net_device *dev = netdev_notifier_info_to_dev(ptr);
+
+ if (dev->type != ARPHRD_CAN)
+ return NOTIFY_DONE;
+ if (msg != NETDEV_UNREGISTER && msg != NETDEV_DOWN)
+ return NOTIFY_DONE;
+ if (unlikely(raw_busy_notifier)) /* Check for reentrant bug. */
+ return NOTIFY_DONE;
+ spin_lock(&raw_notifier_lock);
+ list_for_each_entry(raw_busy_notifier, &raw_notifier_list, notifier) {
+ spin_unlock(&raw_notifier_lock);
+ raw_notify(raw_busy_notifier, msg, dev);
+ spin_lock(&raw_notifier_lock);
+ }
+ raw_busy_notifier = NULL;
+ spin_unlock(&raw_notifier_lock);
return NOTIFY_DONE;
}
@@ -332,9 +352,9 @@ static int raw_init(struct sock *sk)
return -ENOMEM;
/* set notifier */
- ro->notifier.notifier_call = raw_notifier;
-
- register_netdevice_notifier(&ro->notifier);
+ spin_lock(&raw_notifier_lock);
+ list_add_tail(&ro->notifier, &raw_notifier_list);
+ spin_unlock(&raw_notifier_lock);
return 0;
}
@@ -349,7 +369,14 @@ static int raw_release(struct socket *sock)
ro = raw_sk(sk);
- unregister_netdevice_notifier(&ro->notifier);
+ spin_lock(&raw_notifier_lock);
+ while (raw_busy_notifier == ro) {
+ spin_unlock(&raw_notifier_lock);
+ schedule_timeout_uninterruptible(1);
+ spin_lock(&raw_notifier_lock);
+ }
+ list_del(&ro->notifier);
+ spin_unlock(&raw_notifier_lock);
lock_sock(sk);
@@ -857,6 +884,10 @@ static const struct can_proto raw_can_proto = {
.prot = &raw_proto,
};
+static struct notifier_block canraw_notifier = {
+ .notifier_call = raw_notifier
+};
+
static __init int raw_module_init(void)
{
int err;
@@ -866,6 +897,8 @@ static __init int raw_module_init(void)
err = can_proto_register(&raw_can_proto);
if (err < 0)
printk(KERN_ERR "can: registration of raw protocol failed\n");
+ else
+ register_netdevice_notifier(&canraw_notifier);
return err;
}
@@ -873,6 +906,7 @@ static __init int raw_module_init(void)
static __exit void raw_module_exit(void)
{
can_proto_unregister(&raw_can_proto);
+ unregister_netdevice_notifier(&canraw_notifier);
}
module_init(raw_module_init);
--
2.30.2
next parent reply other threads:[~2021-06-21 11:58 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1624271915233178@kroah.com>
2021-06-21 11:58 ` Marc Kleine-Budde [this message]
2021-06-21 12:01 ` [PATCH] can: bcm/raw/isotp: use per module netdevice notifier Marc Kleine-Budde
[not found] <1624271916195215@kroah.com>
2021-06-21 11:24 ` Marc Kleine-Budde
2021-06-21 11:28 ` Marc Kleine-Budde
2021-06-21 15:25 ` Greg KH
2021-06-02 15:17 Tetsuo Handa
2021-06-03 6:09 ` Oliver Hartkopp
2021-06-03 11:02 ` Tetsuo Handa
2021-06-04 0:22 ` Tetsuo Handa
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