kernel: added new prctl CMD_GET_MANAGER_UID to get the uid of the crowned manager

manager: show crowned manager uid in infocard when developer options is enabled

manager/app/src/main/cpp/jni.cc

@@ -25,6 +25,13 @@ Java_com_rifsxd_ksunext_Natives_getVersion(JNIEnv *env, jobject) {
     return get_version();
 }
 
+extern "C"
+JNIEXPORT jint JNICALL
+Java_com_rifsxd_ksunext_Natives_getManagerUid(JNIEnv *env, jobject) {
+    uid_t manager_uid = get_manager_uid();
+    return (jint)manager_uid;
+}
+
 extern "C"
 JNIEXPORT jstring JNICALL
 Java_com_rifsxd_ksunext_Natives_getHookMode(JNIEnv *env, jobject) {

manager/app/src/main/cpp/ksu.cc

@@ -30,6 +30,7 @@
 #define CMD_IS_SU_ENABLED 14
 #define CMD_ENABLE_SU 15
 #define CMD_HOOK_MODE 16
+#define CMD_GET_MANAGER_UID 17
 
 static bool ksuctl(int cmd, void* arg1, void* arg2) {
     int32_t result = 0;
@@ -63,12 +64,19 @@ int get_version(void) {
     return version;
 }
 
+uid_t get_manager_uid() {
+    uid_t manager_uid = (uid_t)-1;
+    ksuctl(CMD_GET_MANAGER_UID, &manager_uid, nullptr);
+    return manager_uid;
+}
+
 const char* get_hook_mode() {
     static char mode[16];
     ksuctl(CMD_HOOK_MODE, mode, nullptr);
     return mode;
 }
 
+
 bool get_allow_list(int *uids, int *size) {
     return ksuctl(CMD_GET_SU_LIST, uids, size);
 }

manager/app/src/main/cpp/ksu.h

@@ -11,6 +11,8 @@ bool become_manager(const char *);
 
 int get_version();
 
+uid_t get_manager_uid();
+
 const char* get_hook_mode();
 
 bool get_allow_list(int *uids, int *size);