mnt_idmapping: move ima-only helpers to ima

The vfs{g,u}id_{gt,lt}_* helpers are currently not needed outside of
ima and we shouldn't incentivize people to use them by placing them into
the header. Let's just define them locally in the one file in ima where
they are used.

Suggested-by: Linus Torvalds <[email protected]>
Signed-off-by: Christian Brauner (Microsoft) <[email protected]>

include/linux/mnt_idmapping.h

@@ -96,26 +96,6 @@ static inline bool vfsgid_eq_kgid(vfsgid_t vfsgid, kgid_t kgid)
 	return vfsgid_valid(vfsgid) && __vfsgid_val(vfsgid) == __kgid_val(kgid);
 }
 
-static inline bool vfsuid_gt_kuid(vfsuid_t vfsuid, kuid_t kuid)
-{
-	return __vfsuid_val(vfsuid) > __kuid_val(kuid);
-}
-
-static inline bool vfsgid_gt_kgid(vfsgid_t vfsgid, kgid_t kgid)
-{
-	return __vfsgid_val(vfsgid) > __kgid_val(kgid);
-}
-
-static inline bool vfsuid_lt_kuid(vfsuid_t vfsuid, kuid_t kuid)
-{
-	return __vfsuid_val(vfsuid) < __kuid_val(kuid);
-}
-
-static inline bool vfsgid_lt_kgid(vfsgid_t vfsgid, kgid_t kgid)
-{
-	return __vfsgid_val(vfsgid) < __kgid_val(kgid);
-}
-
 /*
  * vfs{g,u}ids are created from k{g,u}ids.
  * We don't allow them to be created from regular {u,g}id.

security/integrity/ima/ima_policy.c

@@ -71,6 +71,30 @@ struct ima_rule_opt_list {
 	char *items[];
 };
 
+/*
+ * These comparators are needed nowhere outside of ima so just define them here.
+ * This pattern should hopefully never be needed outside of ima.
+ */
+static inline bool vfsuid_gt_kuid(vfsuid_t vfsuid, kuid_t kuid)
+{
+	return __vfsuid_val(vfsuid) > __kuid_val(kuid);
+}
+
+static inline bool vfsgid_gt_kgid(vfsgid_t vfsgid, kgid_t kgid)
+{
+	return __vfsgid_val(vfsgid) > __kgid_val(kgid);
+}
+
+static inline bool vfsuid_lt_kuid(vfsuid_t vfsuid, kuid_t kuid)
+{
+	return __vfsuid_val(vfsuid) < __kuid_val(kuid);
+}
+
+static inline bool vfsgid_lt_kgid(vfsgid_t vfsgid, kgid_t kgid)
+{
+	return __vfsgid_val(vfsgid) < __kgid_val(kgid);
+}
+
 struct ima_rule_entry {
 	struct list_head list;
 	int action;