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Android APP 启用 ROOT

在默认情况下，Android 13 并未开启 ROOT 功能，如需要启用 ROOT 需要做如下修改：

  • build/make/target/product/base_system.mk

在 PRODUCT_PACKAGES 最后增加字段

su \

image-20240820221330158

  • frameworks/base/core/jni/com_android_internal_os_Zygote.cpp

找到 DropCapabilitiesBoundingSet 函数，将其功能废除

static void DropCapabilitiesBoundingSet(fail_fn_t fail_fn) {
  return;
  // for (int i = 0; prctl(PR_CAPBSET_READ, i, 0, 0, 0) >= 0; i++) {;
  //   if (prctl(PR_CAPBSET_DROP, i, 0, 0, 0) == -1) {
  //     if (errno == EINVAL) {
  //       ALOGE("prctl(PR_CAPBSET_DROP) failed with EINVAL. Please verify "
  //             "your kernel is compiled with file capabilities support");
  //     } else {
  //       fail_fn(CREATE_ERROR("prctl(PR_CAPBSET_DROP, %d) failed: %s", i, strerror(errno)));
  //     }
  //   }
  // }
}

image-20240820221411472

  • system/core/init/selinux.cpp

找到 SelinuxSetEnforcement 函数，配置 is_enforcing 为 false

image-20240820222811611

  • system/core/libcutils/fs_config.cpp

找到 { 04750, AID_ROOT, AID_SHELL, 0, "system/xbin/su" }, 改为

{ 06755, AID_ROOT,      AID_SHELL,     0, "system/bin/su" },

image-20240820221714917

  • system/extras/su/su.cpp

找到 main 函数，注释检测

image-20240820221849138

  • system/extras/su/Android.bp

找到 install_in_xbin: true, 将其删除

image-20240820221924452