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authorSteve French <smfrench@gmail.com>2017-10-25 15:58:31 -0500
committerSteve French <smfrench@gmail.com>2017-10-26 12:20:59 -0500
commit4587eee04e2ac7ac3ac9fa2bc164fb6e548f99cd (patch)
treea852e0565e761bfec1613e71b8846d5e10e10f64 /fs
parenta2d9daad1d2dfbd307ab158044d1c323d7babbde (diff)
downloadlinux-4587eee04e2ac7ac3ac9fa2bc164fb6e548f99cd.tar.bz2
SMB3: Validate negotiate request must always be signed
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 CC: Stable <stable@vger.kernel.org> Acked-by: Ronnie Sahlberg <lsahlber.redhat.com> Signed-off-by: Steve French <smfrench@gmail.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/cifs/smb2pdu.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index ba58af747b43..5331631386a2 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -1979,6 +1979,9 @@ SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
} 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);