userns: Convert group_info values from gid_t to kgid_t.

As a first step to converting struct cred to be all kuid_t and kgid_t
values convert the group values stored in group_info to always be
kgid_t values.   Unless user namespaces are used this change should
have no effect.

Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/fs/nfsd/auth.c b/fs/nfsd/auth.c
index 79717a40daba..204438cc914e 100644
--- a/fs/nfsd/auth.c
+++ b/fs/nfsd/auth.c
@@ -1,6 +1,7 @@
 /* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> */
 
 #include <linux/sched.h>
+#include <linux/user_namespace.h>
 #include "nfsd.h"
 #include "auth.h"
 
@@ -56,8 +57,8 @@ int nfsd_setuser(struct svc_rqst *rqstp, struct svc_export *exp)
                         goto oom;
 
                 for (i = 0; i < rqgi->ngroups; i++) {
-                        if (!GROUP_AT(rqgi, i))
-                                GROUP_AT(gi, i) = exp->ex_anon_gid;
+                        if (gid_eq(GLOBAL_ROOT_GID, GROUP_AT(rqgi, i)))
+                                GROUP_AT(gi, i) = make_kgid(&init_user_ns, exp->ex_anon_gid);
                         else
                                 GROUP_AT(gi, i) = GROUP_AT(rqgi, i);
                 }