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net: introduce CAN specific pointer in the struct net_device

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Since 20dd3850bc ("can: Speed up CAN frame receiption by using
ml_priv") the CAN framework uses per device specific data in the AF_CAN
protocol. For this purpose the struct net_device->ml_priv is used. Later
the ml_priv usage in CAN was extended for other users, one of them being
CAN_J1939.

Later in the kernel ml_priv was converted to an union, used by other
drivers. E.g. the tun driver started storing it's stats pointer.

Since tun devices can claim to be a CAN device, CAN specific protocols
will wrongly interpret this pointer, which will cause system crashes.
Mostly this issue is visible in the CAN_J1939 stack.

To fix this issue, we request a dedicated CAN pointer within the
net_device struct.

Reported-by: syzbot+5138c4dd15a0401bec7b@syzkaller.appspotmail.com
Fixes: 20dd3850bc ("can: Speed up CAN frame receiption by using ml_priv")
Fixes: ffd956eef6 ("can: introduce CAN midlayer private and allocate it automatically")
Fixes: 9d71dd0c70 ("can: add support of SAE J1939 protocol")
Fixes: 497a5757ce ("tun: switch to net core provided statistics counters")
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Link: https://lore.kernel.org/r/20210223070127.4538-1-o.rempel@pengutronix.de
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Oleksij Rempel
2021-02-23 08:01:26 +01:00
committed by Jakub Kicinski
parent 88eee9b7b4
commit 4e096a1886
10 changed files with 84 additions and 66 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
include/linux/can/can-ml.h
View File

@@ -44,6 +44,7 @@
#include <linux/can.h>
#include <linux/list.h>
#include <linux/netdevice.h>
#define CAN_SFF_RCV_ARRAY_SZ (1 << CAN_SFF_ID_BITS)
#define CAN_EFF_RCV_HASH_BITS 10
@@ -65,4 +66,15 @@ struct can_ml_priv {
#endif
};
static inline struct can_ml_priv *can_get_ml_priv(struct net_device *dev)
{
return netdev_get_ml_priv(dev, ML_PRIV_CAN);
}
static inline void can_set_ml_priv(struct net_device *dev,
struct can_ml_priv *ml_priv)
{
netdev_set_ml_priv(dev, ml_priv, ML_PRIV_CAN);
}
#endif /* CAN_ML_H */