Kuniyuki Iwashima bf4ea58874 arp: Convert ioctl(SIOCGARP) to RCU. ...

ioctl(SIOCGARP) holds rtnl_lock() to get netdev by __dev_get_by_name()
and copy dev->name safely and calls neigh_lookup() later, which looks
up a neighbour entry under RCU.

Let's replace __dev_get_by_name() with dev_get_by_name_rcu() and strscpy()
with netdev_copy_name() to avoid locking rtnl_lock().

Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Link: https://lore.kernel.org/r/20240430015813.71143-8-kuniyu@amazon.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

2024-05-01 18:37:07 -07:00

37 KiB

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