[CIFS] check version in spnego upcall response
Currently, we don't check the version in the SPNEGO upcall response
even though one is provided. Jeff and Q have made the corresponding
change to the Samba client (cifs.upcall).
Acked-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
diff --git a/fs/cifs/CHANGES b/fs/cifs/CHANGES
index f5d0083..526041a 100644
--- a/fs/cifs/CHANGES
+++ b/fs/cifs/CHANGES
@@ -4,7 +4,11 @@
on EAGAIN from the socket too quickly on large writes).
Cifs_mkdir and cifs_create now respect the setgid bit on parent dir.
Fix endian problems in acl (mode from/to cifs acl) on bigendian
-architectures.
+architectures. Fix problems with preserving timestamps on copying open
+files (e.g. "cp -a") to Windows servers. For mkdir and create honor setgid bit
+on parent directory when server supports Unix Extensions but not POSIX
+create. Update cifs.upcall version to handle new Kerberos sec flags
+(this requires update of cifs.upcall program from Samba).
Version 1.53
------------
diff --git a/fs/cifs/cifs_spnego.h b/fs/cifs/cifs_spnego.h
index 05a34b1..e4041ec 100644
--- a/fs/cifs/cifs_spnego.h
+++ b/fs/cifs/cifs_spnego.h
@@ -23,7 +23,7 @@
#ifndef _CIFS_SPNEGO_H
#define _CIFS_SPNEGO_H
-#define CIFS_SPNEGO_UPCALL_VERSION 1
+#define CIFS_SPNEGO_UPCALL_VERSION 2
/*
* The version field should always be set to CIFS_SPNEGO_UPCALL_VERSION.
diff --git a/fs/cifs/sess.c b/fs/cifs/sess.c
index 3188e4d..b537fad 100644
--- a/fs/cifs/sess.c
+++ b/fs/cifs/sess.c
@@ -516,6 +516,15 @@
}
msg = spnego_key->payload.data;
+ /* check version field to make sure that cifs.upcall is
+ sending us a response in an expected form */
+ if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
+ cERROR(1, ("incorrect version of cifs.upcall (expected"
+ " %d but got %d)",
+ CIFS_SPNEGO_UPCALL_VERSION, msg->version));
+ rc = -EKEYREJECTED;
+ goto ssetup_exit;
+ }
/* bail out if key is too long */
if (msg->sesskey_len >
sizeof(ses->server->mac_signing_key.data.krb5)) {