| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-Id: <20230717180938.230816-2-mkl@pengutronix.de>
Date: Mon, 17 Jul 2023 20:09:34 +0200
From: Marc Kleine-Budde <mkl@...gutronix.de>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net,
kuba@...nel.org,
linux-can@...r.kernel.org,
kernel@...gutronix.de,
Ziyang Xuan <william.xuanziyang@...wei.com>,
Oliver Hartkopp <socketcan@...tkopp.net>,
stable@...r.kernel.org,
Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [PATCH net 1/5] can: raw: fix receiver memory leak
From: Ziyang Xuan <william.xuanziyang@...wei.com>
Got kmemleak errors with the following ltp can_filter testcase:
for ((i=1; i<=100; i++))
do
./can_filter &
sleep 0.1
done
==============================================================
[<00000000db4a4943>] can_rx_register+0x147/0x360 [can]
[<00000000a289549d>] raw_setsockopt+0x5ef/0x853 [can_raw]
[<000000006d3d9ebd>] __sys_setsockopt+0x173/0x2c0
[<00000000407dbfec>] __x64_sys_setsockopt+0x61/0x70
[<00000000fd468496>] do_syscall_64+0x33/0x40
[<00000000b7e47d51>] entry_SYSCALL_64_after_hwframe+0x61/0xc6
It's a bug in the concurrent scenario of unregister_netdevice_many()
and raw_release() as following:
cpu0 cpu1
unregister_netdevice_many(can_dev)
unlist_netdevice(can_dev) // dev_get_by_index() return NULL after this
net_set_todo(can_dev)
raw_release(can_socket)
dev = dev_get_by_index(, ro->ifindex); // dev == NULL
if (dev) { // receivers in dev_rcv_lists not free because dev is NULL
raw_disable_allfilters(, dev, );
dev_put(dev);
}
...
ro->bound = 0;
...
call_netdevice_notifiers(NETDEV_UNREGISTER, )
raw_notify(, NETDEV_UNREGISTER, )
if (ro->bound) // invalid because ro->bound has been set 0
raw_disable_allfilters(, dev, ); // receivers in dev_rcv_lists will never be freed
Add a net_device pointer member in struct raw_sock to record bound
can_dev, and use rtnl_lock to serialize raw_socket members between
raw_bind(), raw_release(), raw_setsockopt() and raw_notify(). Use
ro->dev to decide whether to free receivers in dev_rcv_lists.
Fixes: 8d0caedb7596 ("can: bcm/raw/isotp: use per module netdevice notifier")
Reviewed-by: Oliver Hartkopp <socketcan@...tkopp.net>
Acked-by: Oliver Hartkopp <socketcan@...tkopp.net>
Signed-off-by: Ziyang Xuan <william.xuanziyang@...wei.com>
Link: https://lore.kernel.org/all/20230711011737.1969582-1-william.xuanziyang@huawei.com
Cc: stable@...r.kernel.org
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
---
net/can/raw.c | 57 ++++++++++++++++++++++-----------------------------
1 file changed, 24 insertions(+), 33 deletions(-)
diff --git a/net/can/raw.c b/net/can/raw.c
index 15c79b079184..2302e4882967 100644
--- a/net/can/raw.c
+++ b/net/can/raw.c
@@ -84,6 +84,7 @@ struct raw_sock {
struct sock sk;
int bound;
int ifindex;
+ struct net_device *dev;
struct list_head notifier;
int loopback;
int recv_own_msgs;
@@ -277,7 +278,7 @@ static void raw_notify(struct raw_sock *ro, unsigned long msg,
if (!net_eq(dev_net(dev), sock_net(sk)))
return;
- if (ro->ifindex != dev->ifindex)
+ if (ro->dev != dev)
return;
switch (msg) {
@@ -292,6 +293,7 @@ static void raw_notify(struct raw_sock *ro, unsigned long msg,
ro->ifindex = 0;
ro->bound = 0;
+ ro->dev = NULL;
ro->count = 0;
release_sock(sk);
@@ -337,6 +339,7 @@ static int raw_init(struct sock *sk)
ro->bound = 0;
ro->ifindex = 0;
+ ro->dev = NULL;
/* set default filter to single entry dfilter */
ro->dfilter.can_id = 0;
@@ -385,19 +388,13 @@ static int raw_release(struct socket *sock)
lock_sock(sk);
+ rtnl_lock();
/* remove current filters & unregister */
if (ro->bound) {
- if (ro->ifindex) {
- struct net_device *dev;
-
- dev = dev_get_by_index(sock_net(sk), ro->ifindex);
- if (dev) {
- raw_disable_allfilters(dev_net(dev), dev, sk);
- dev_put(dev);
- }
- } else {
+ if (ro->dev)
+ raw_disable_allfilters(dev_net(ro->dev), ro->dev, sk);
+ else
raw_disable_allfilters(sock_net(sk), NULL, sk);
- }
}
if (ro->count > 1)
@@ -405,8 +402,10 @@ static int raw_release(struct socket *sock)
ro->ifindex = 0;
ro->bound = 0;
+ ro->dev = NULL;
ro->count = 0;
free_percpu(ro->uniq);
+ rtnl_unlock();
sock_orphan(sk);
sock->sk = NULL;
@@ -422,6 +421,7 @@ static int raw_bind(struct socket *sock, struct sockaddr *uaddr, int len)
struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
struct sock *sk = sock->sk;
struct raw_sock *ro = raw_sk(sk);
+ struct net_device *dev = NULL;
int ifindex;
int err = 0;
int notify_enetdown = 0;
@@ -431,14 +431,13 @@ static int raw_bind(struct socket *sock, struct sockaddr *uaddr, int len)
if (addr->can_family != AF_CAN)
return -EINVAL;
+ rtnl_lock();
lock_sock(sk);
if (ro->bound && addr->can_ifindex == ro->ifindex)
goto out;
if (addr->can_ifindex) {
- struct net_device *dev;
-
dev = dev_get_by_index(sock_net(sk), addr->can_ifindex);
if (!dev) {
err = -ENODEV;
@@ -467,26 +466,20 @@ static int raw_bind(struct socket *sock, struct sockaddr *uaddr, int len)
if (!err) {
if (ro->bound) {
/* unregister old filters */
- if (ro->ifindex) {
- struct net_device *dev;
-
- dev = dev_get_by_index(sock_net(sk),
- ro->ifindex);
- if (dev) {
- raw_disable_allfilters(dev_net(dev),
- dev, sk);
- dev_put(dev);
- }
- } else {
+ if (ro->dev)
+ raw_disable_allfilters(dev_net(ro->dev),
+ ro->dev, sk);
+ else
raw_disable_allfilters(sock_net(sk), NULL, sk);
- }
}
ro->ifindex = ifindex;
ro->bound = 1;
+ ro->dev = dev;
}
out:
release_sock(sk);
+ rtnl_unlock();
if (notify_enetdown) {
sk->sk_err = ENETDOWN;
@@ -553,9 +546,9 @@ static int raw_setsockopt(struct socket *sock, int level, int optname,
rtnl_lock();
lock_sock(sk);
- if (ro->bound && ro->ifindex) {
- dev = dev_get_by_index(sock_net(sk), ro->ifindex);
- if (!dev) {
+ dev = ro->dev;
+ if (ro->bound && dev) {
+ if (dev->reg_state != NETREG_REGISTERED) {
if (count > 1)
kfree(filter);
err = -ENODEV;
@@ -596,7 +589,6 @@ static int raw_setsockopt(struct socket *sock, int level, int optname,
ro->count = count;
out_fil:
- dev_put(dev);
release_sock(sk);
rtnl_unlock();
@@ -614,9 +606,9 @@ static int raw_setsockopt(struct socket *sock, int level, int optname,
rtnl_lock();
lock_sock(sk);
- if (ro->bound && ro->ifindex) {
- dev = dev_get_by_index(sock_net(sk), ro->ifindex);
- if (!dev) {
+ dev = ro->dev;
+ if (ro->bound && dev) {
+ if (dev->reg_state != NETREG_REGISTERED) {
err = -ENODEV;
goto out_err;
}
@@ -640,7 +632,6 @@ static int raw_setsockopt(struct socket *sock, int level, int optname,
ro->err_mask = err_mask;
out_err:
- dev_put(dev);
release_sock(sk);
rtnl_unlock();
base-commit: 0dd1805fe498e0cf64f68e451a8baff7e64494ec
--
2.40.1
Powered by blists - more mailing lists