本a文介绍RK3566/RK3568开发板Android11系统,编译ROOT权限固件的方法。触觉智能Purple Pi OH鸿蒙开发板演示,搭载了瑞芯微RK3566四核处理器,Laval鸿蒙社区推荐开发板,已适配全新OpenHarmony5.0 Release系统,SDK源码全开放!
关闭Selinux
修改以下路径文件:
adevice/rockchip/common/BoardConfig.mk修改代码如下:BOARD_BOOT_HEADER_VERSION ?= 2BOARD_MKBOOTIMG_ARGS :=BOARD_PREBUILT_DTBOIMAGE ?= $(TARGET_DEVICE_DIR)/dtbo.imgBOARD_ROCKCHIP_VIRTUAL_AB_ENABLE ?= false-BOARD_SELINUX_ENFORCING ?= true+BOARD_SELINUX_ENFORCING ?= false
注意:"+"号为修改内容。注释用户组权限检测修改以下路径文件:system/extras/su/su.cpp
修改代码如下:
void extract_uidgids(const char* uidgids, uid_t* uid, gid_t*gid, gid_t* gids, i}int main(int argc, char** argv) {- uid_t current_uid = getuid();- if (current_uid != AID_ROOT && current_uid != AID_SHELL) error(1, 0, "notallowed");+ //uid_t current_uid = getuid();+ //if (current_uid != AID_ROOT && current_uid != AID_SHELL) error(1, 0, "notallowed");
注意:"+"号为修改内容。
给su文件默认授予root权限修改以下路径文件:system/core/libcutils/fs_config.cpp
修改代码如下:
static const struct fs_path_config android_files[] = {// the following two files are INTENTIONALLY set-uid, but they// are NOT included on user builds.{ 06755, AID_ROOT, AID_ROOT, 0, "system/xbin/procmem" },- { 04750, AID_ROOT, AID_SHELL, 0, "system/xbin/su" },+ { 06755, AID_ROOT, AID_SHELL, 0, "system/xbin/su" },
修改以下路径文件:frameworks/base/core/jni/com_android_internal_os_Zygote.cpp修改代码如下:
static void DropCapabilitiesBoundingSet(fail_fn_t fail_fn) {+/* 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))); } } } + */ }
修改以下路径文件:kernel/security/commoncap.c修改代码如下:
int cap_task_setnice(struct task_struct *p, int nice)static int cap_prctl_drop(unsigned long cap){ struct cred *new; +/* if (!ns_capable(current_user_ns(), CAP_SETPCAP)) return -EPERM; if (!cap_valid(cap)) return -EINVAL;-+*/ new = prepare_creds();
注意:"+"号为修改内容。源码编译并测试修改完上面三个步骤的文件后,即可在源码根目录下编译安卓源码:
# make -j4
下载Root Checker(ROOT检查工具),通过ADB命令或者U盘安装后,打开按照提示点击按钮检测ROOT,如图:若ROOT成功则如图所示:
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