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ksmbd: call rcu_barrier() in ksmbd_server_exit()

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commit eb307d09fe upstream.

racy issue is triggered the bug by racing between closing a connection
and rmmod. In ksmbd, rcu_barrier() is not called at module unload time,
so nothing prevents ksmbd from getting unloaded while it still has RCU
callbacks pending. It leads to trigger unintended execution of kernel
code locally and use to defeat protections such as Kernel Lockdown

Cc: stable@vger.kernel.org
Reported-by: zdi-disclosures@trendmicro.com # ZDI-CAN-20477
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Namjae Jeon 2023-05-03 08:51:51 +09:00 committed by Greg Kroah-Hartman
parent dc1c17716c
commit d417450501
1 changed files with 1 additions and 0 deletions
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fs/ksmbd/server.c
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@ -606,6 +606,7 @@ static int __init ksmbd_server_init(void)
static void __exit ksmbd_server_exit(void)
{
ksmbd_server_shutdown();
rcu_barrier();
ksmbd_release_inode_hash();
}