nfsd: Convert nfsxdr to use kuids and kgids

When reading uids and gids off the wire convert them to
kuids and kgids.  If the conversion results in an invalid
result don't set the ATTR_UID or ATTR_GID.

When putting kuids and kgids onto the wire first convert
them to uids and gids the other side will understand.

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

diff --git a/fs/nfsd/nfsxdr.c b/fs/nfsd/nfsxdr.c
index 1e51e7034a89a1574a29d5fd57b5361405d40cc6..4201ede0ec910bcd85ecf02cfa27d9da75c94bce 100644 (file)
--- a/fs/nfsd/nfsxdr.c
+++ b/fs/nfsd/nfsxdr.c
@@ -100,12 +100,14 @@ decode_sattr(__be32 *p, struct iattr *iap)
                iap->ia_mode = tmp;
        }
        if ((tmp = ntohl(*p++)) != (u32)-1) {
-               iap->ia_valid |= ATTR_UID;
-               iap->ia_uid = tmp;
+               iap->ia_uid = make_kuid(&init_user_ns, tmp);
+               if (uid_valid(iap->ia_uid))
+                       iap->ia_valid |= ATTR_UID;
        }
        if ((tmp = ntohl(*p++)) != (u32)-1) {
-               iap->ia_valid |= ATTR_GID;
-               iap->ia_gid = tmp;
+               iap->ia_gid = make_kgid(&init_user_ns, tmp);
+               if (gid_valid(iap->ia_gid))
+                       iap->ia_valid |= ATTR_GID;
        }
        if ((tmp = ntohl(*p++)) != (u32)-1) {
                iap->ia_valid |= ATTR_SIZE;
@@ -151,8 +153,8 @@ encode_fattr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp,
        *p++ = htonl(nfs_ftypes[type >> 12]);
        *p++ = htonl((u32) stat->mode);
        *p++ = htonl((u32) stat->nlink);
-       *p++ = htonl((u32) stat->uid);
-       *p++ = htonl((u32) stat->gid);
+       *p++ = htonl((u32) from_kuid(&init_user_ns, stat->uid));
+       *p++ = htonl((u32) from_kgid(&init_user_ns, stat->gid));
 
        if (S_ISLNK(type) && stat->size > NFS_MAXPATHLEN) {
                *p++ = htonl(NFS_MAXPATHLEN);