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| author | Namjae Jeon <linkinjeon@kernel.org> | 2023-05-03 02:43:30 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-05-17 12:53:56 +0300 |
| commit | 502cf9709036d9305495876fa8c33c8a52541b15 (patch) | |
| tree | b6fe9cec9cbc2a38c34929f21b6646c8a82cca09 /fs/ksmbd | |
| parent | 1fc8a2b14ef5223f8e0b95faba2ee0a6e4d0f99d (diff) | |
| download | linux-502cf9709036d9305495876fa8c33c8a52541b15.tar.xz | |
ksmbd: block asynchronous requests when making a delay on session setup
[ 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>
Diffstat (limited to 'fs/ksmbd')
| -rw-r--r-- | fs/ksmbd/smb2pdu.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c index d3f33194faf1..e7594a56cbfe 100644 --- a/fs/ksmbd/smb2pdu.c +++ b/fs/ksmbd/smb2pdu.c @@ -1862,8 +1862,11 @@ out_err: 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); + } } } |