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, 5 insertions, 4 deletions

diff --git a/include/linux/cred.h b/include/linux/cred.h
index 2c60ec802678..0ab3cda4a774 100644
--- a/include/linux/cred.h
+++ b/include/linux/cred.h
@@ -17,6 +17,7 @@
 #include <linux/key.h>
 #include <linux/selinux.h>
 #include <linux/atomic.h>
+#include <linux/uidgid.h>
 
 struct user_struct;
 struct cred;
@@ -26,14 +27,14 @@ struct inode;
  * COW Supplementary groups list
  */
 #define NGROUPS_SMALL           32
-#define NGROUPS_PER_BLOCK       ((unsigned int)(PAGE_SIZE / sizeof(gid_t)))
+#define NGROUPS_PER_BLOCK       ((unsigned int)(PAGE_SIZE / sizeof(kgid_t)))
 
 struct group_info {
         atomic_t        usage;
         int             ngroups;
         int             nblocks;
-        gid_t           small_block[NGROUPS_SMALL];
-        gid_t           *blocks[0];
+        kgid_t          small_block[NGROUPS_SMALL];
+        kgid_t          *blocks[0];
 };
 
 /**
@@ -66,7 +67,7 @@ extern struct group_info init_groups;
 extern void groups_free(struct group_info *);
 extern int set_current_groups(struct group_info *);
 extern int set_groups(struct cred *, struct group_info *);
-extern int groups_search(const struct group_info *, gid_t);
+extern int groups_search(const struct group_info *, kgid_t);
 
 /* access the groups "array" with this macro */
 #define GROUP_AT(gi, i) \