4.16-stable review patch. If anyone has any objections, please let me know.
------------------ From: Steve French <[email protected]> commit 6188f28bf608ddecc2377663b0f2f709440c19ba upstream. SMB3.1.1 tree connect was only being signed when signing was mandatory but needs to always be signed (for non-guest users). See MS-SMB2 section 3.2.4.1.1 Signed-off-by: Steve French <[email protected]> Reviewed-by: Pavel Shilovsky <[email protected]> CC: Stable <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- fs/cifs/smb2pdu.c | 5 +++++ 1 file changed, 5 insertions(+) --- a/fs/cifs/smb2pdu.c +++ b/fs/cifs/smb2pdu.c @@ -1280,6 +1280,11 @@ SMB2_tcon(const unsigned int xid, struct iov[1].iov_base = unc_path; iov[1].iov_len = unc_path_len; + /* 3.11 tcon req must be signed if not encrypted. See MS-SMB2 3.2.4.1.1 */ + if ((ses->server->dialect == SMB311_PROT_ID) && + !encryption_required(tcon)) + req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED; + rc = smb2_send_recv(xid, ses, iov, 2, &resp_buftype, flags, &rsp_iov); cifs_small_buf_release(req); rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
