Init

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

@@ -0,0 +1,50 @@
+//
+// Created by weishu on 2022/12/9.
+//
+
+#include <sys/prctl.h>
+#include <stdint.h>
+
+#include "ksu.h"
+
+#define KERNEL_SU_OPTION 0xDEADBEEF
+
+#define CMD_GRANT_ROOT 0
+
+#define CMD_BECOME_MANAGER 1
+#define CMD_GET_VERSION 2
+#define CMD_ALLOW_SU 3
+#define CMD_DENY_SU 4
+#define CMD_GET_ALLOW_LIST 5
+#define CMD_GET_DENY_LIST 6
+
+static bool ksuctl(int cmd, void* arg1, void* arg2) {
+    int32_t result = 0;
+    prctl(KERNEL_SU_OPTION, cmd, arg1, arg2, &result);
+    return result == KERNEL_SU_OPTION;
+}
+
+bool become_manager() {
+    return ksuctl(CMD_BECOME_MANAGER, nullptr, nullptr);
+}
+
+int get_version() {
+    int32_t version = -1;
+    if (ksuctl(CMD_GET_VERSION, &version, nullptr)) {
+        return version;
+    }
+    return version;
+}
+
+bool allow_su(int uid, bool allow) {
+    int cmd = allow ? CMD_ALLOW_SU : CMD_DENY_SU;
+    return ksuctl(cmd, (void*) uid, nullptr);
+}
+
+bool get_allow_list(int *uids, int *size) {
+    return ksuctl(CMD_GET_ALLOW_LIST, uids, size);
+}
+
+bool get_deny_list(int *uids, int *size) {
+    return ksuctl(CMD_GET_DENY_LIST, uids, size);
+}