Den 31.10.2017 kl. 11:55, skrev Greg Kroah-Hartman:
4.13-stable review patch. If anyone has any objections, please let me know.
------------------
From: Steve French <smfrench@xxxxxxxxx>
commit 4587eee04e2ac7ac3ac9fa2bc164fb6e548f99cd upstream.
According to MS-SMB2 3.2.55 validate_negotiate request must
always be signed. Some Windows can fail the request if you send it unsigned
See kernel bugzilla bug 197311
Acked-by: Ronnie Sahlberg <lsahlber.redhat.com>
Signed-off-by: Steve French <smfrench@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/cifs/smb2pdu.c | 3 +++
1 file changed, 3 insertions(+)
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -1963,6 +1963,9 @@ SMB2_ioctl(const unsigned int xid, struc
} else
iov[0].iov_len = get_rfc1002_length(req) + 4;
+ /* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
+ if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
+ req->hdr.sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
rc = SendReceive2(xid, ses, iov, n_iov, &resp_buftype, flags, &rsp_iov);
cifs_small_buf_release(req);
This one needs to be backported to all stable kernels as the commit that
introduced the regression:
'
0603c96f3af50e2f9299fa410c224ab1d465e0f9
SMB: Validate negotiate (to protect against downgrade) even if signing off
is backported in stable trees as of: 4.9.53, 4.4.90, 3.18.73
--
Thomas