capabilities: keep bounding set in non-inverted format.

Change the capability bounding set parser and logic so that the bounding
set is kept as a positive set internally. This means that the set
reflects those capabilities that we want to keep instead of drop.

src/basic/capability-util.h

@@ -29,10 +29,12 @@
 #include "macro.h"
 #include "util.h"
 
+#define CAP_ALL (uint64_t) -1
+
 unsigned long cap_last_cap(void);
 int have_effective_cap(int value);
-int capability_bounding_set_drop(uint64_t drop, bool right_now);
-int capability_bounding_set_drop_usermode(uint64_t drop);
+int capability_bounding_set_drop(uint64_t keep, bool right_now);
+int capability_bounding_set_drop_usermode(uint64_t keep);
 
 int drop_privileges(uid_t uid, gid_t gid, uint64_t keep_capabilities);
 
@@ -46,3 +48,9 @@ static inline void cap_free_charpp(char **p) {
                 cap_free(*p);
 }
 #define _cleanup_cap_free_charp_ _cleanup_(cap_free_charpp)
+
+static inline bool cap_test_all(uint64_t caps) {
+        uint64_t m;
+        m = (UINT64_C(1) << (cap_last_cap() + 1)) - 1;
+        return (caps & m) == m;
+}