nfsd: Modify nfsd4_cb_sec to use kuids and kgids

Change uid and gid in struct nfsd4_cb_sec to be of type kuid_t and
kgid_t.

In nfsd4_decode_cb_sec when reading uids and gids off the wire convert
them to kuids and kgids, and if they don't convert to valid kuids or
valid kuids ignore RPC_AUTH_UNIX and don't fill in any of the fields.

Cc: "J. Bruce Fields" <bfields@fieldses.org>
Cc: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>

2 files changed, 12 insertions, 5 deletions

diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index 3812b06d24b1..2d1d06bae3a7 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -464,9 +464,16 @@ static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_
                         READ32(dummy);
                         READ_BUF(dummy * 4);
                         if (cbs->flavor == (u32)(-1)) {
-                                cbs->uid = uid;
-                                cbs->gid = gid;
-                                cbs->flavor = RPC_AUTH_UNIX;
+                                kuid_t kuid = make_kuid(&init_user_ns, uid);
+                                kgid_t kgid = make_kgid(&init_user_ns, gid);
+                                if (uid_valid(kuid) && gid_valid(kgid)) {
+                                        cbs->uid = kuid;
+                                        cbs->gid = kgid;
+                                        cbs->flavor = RPC_AUTH_UNIX;
+                                } else {
+                                        dprintk("RPC_AUTH_UNIX with invalid"
+                                                "uid or gid ignoring!\n");
+                                }
                         }
                         break;
                 case RPC_AUTH_GSS:
diff --git a/fs/nfsd/state.h b/fs/nfsd/state.h
index d1c229feed52..1a8c7391f7ae 100644
--- a/fs/nfsd/state.h
+++ b/fs/nfsd/state.h
@@ -152,8 +152,8 @@ struct nfsd4_channel_attrs {
 
 struct nfsd4_cb_sec {
         u32     flavor; /* (u32)(-1) used to mean "no valid flavor" */
-        u32     uid;
-        u32     gid;
+        kuid_t  uid;
+        kgid_t  gid;
 };
 
 struct nfsd4_create_session {