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ksmbd: block asynchronous requests when making a delay on session setup

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[ Upstream commit b096d97f47326b1e2dbdef1c91fab69ffda54d17 ]

ksmbd make a delay of 5 seconds on session setup to avoid dictionary
attacks. But the 5 seconds delay can be bypassed by using asynchronous
requests. This patch block all requests on current connection when
making a delay on sesstion setup failure.

Cc: stable@vger.kernel.org
Reported-by: zdi-disclosures@trendmicro.com # ZDI-CAN-20482
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Namjae Jeon 2023-05-03 08:43:30 +09:00 committed by Greg Kroah-Hartman
parent 1fc8a2b14e
commit 502cf97090
1 changed files with 4 additions and 1 deletions
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5
fs/ksmbd/smb2pdu.c
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@ -1862,8 +1862,11 @@ int smb2_sess_setup(struct ksmbd_work *work)
sess->last_active = jiffies;
sess->state = SMB2_SESSION_EXPIRED;
if (try_delay)
if (try_delay) {
ksmbd_conn_set_need_reconnect(conn);
ssleep(5);
ksmbd_conn_set_need_negotiate(conn);
}
}
}