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本文介绍编译Android13 ROOT权限固件的方法，触觉智能RK3562开发板演示，搭载4核A53处理器，主频高达2.0GHz；内置独立1Tops算力NPU，可应用于物联网网关、平板电脑、智能家居、教育电子、工业显示与控制等行业。
关闭selinux
修改此文件（"+"号为修改内容）
device/rockchip/common/BoardConfig.mk
BOARD_BOOT_HEADER_VERSION ?= 2
BOARD_MKBOOTIMG_ARGS :=
BOARD_PREBUILT_DTBOIMAGE ?= $(TARGET_DEVICE_DIR)/dtbo.img
BOARD_ROCKCHIP_VIRTUAL_AB_ENABLE ?= false
-BOARD_SELINUX_ENFORCING ?= true
+BOARD_SELINUX_ENFORCING ?= false注释用户组权限检测
修改此文件（"+"号为修改内容）
system/extras/su/su.cpp
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");给su文件默认授予root权限
修改此文件（"+"号为修改内容）
system/core/libcutils/fs_config.cpp
static const struct fs_path_config android_dirs[] = {
{ 00751, AID_ROOT, AID_SHELL, 0, "system/bin" },
{ 00755, AID_ROOT, AID_ROOT, 0, "system/etc/ppp" },
{ 00755, AID_ROOT, AID_SHELL, 0, "system/vendor" },
- { 00750, AID_ROOT, AID_SHELL, 0, "system/xbin" },
+ { 00755, AID_ROOT, AID_SHELL, 0, "system/xbin" },
{ 00751, AID_ROOT, AID_SHELL, 0, "system/apex/*/bin" },
{ 00751, AID_ROOT, AID_SHELL, 0, "system_ext/bin" },
{ 00751, AID_ROOT, AID_SHELL, 0, "system_ext/apex/*/bin" },
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" },然后修改此文件（"+"号为修改内容）
frameworks/base/core/jni/com_android_internal_os_Zygote.cpp
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)));
}
}
}
+ */
}最后修改此文件（"+"号为修改内容）
kernel-5.10/security/commoncap.c
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();源码编译并验证固件是否ROOT
修改完上面三个步骤的文件后，重新编译内核和安卓源码，执行以下命令：
# make -j4下载RootChecker测试APK软件包（自行下载）,可通过ADB命令或者U盘安装,安装后按照提示点击按钮检查root。
root成功如图：
产品简介
触觉智能RK3562开发板（型号EVB3562），基于瑞芯微新一代Soc RK3562/RK3562J设计，可用于轻量级人工智能应用。EVB3562开发板配备了PCIe2.1/USB3.0 OTG/千兆网口等各类型接口，支持4G/5G通信、多摄像头及多种视频接口，可应用于物联网网关、平板电脑、智能家居、教育电子、工业显示、工业控制等行业领域。
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