瑞芯微RK3566/RK3568開發(fā)板安卓11固件ROOT教程，Purple Pi OH演示

本文介紹RK3566/RK3568開發(fā)板Android11系統(tǒng)，編譯ROOT權(quán)限固件的方法。觸覺智能Purple Pi OH鴻蒙開發(fā)板演示，搭載了瑞芯微RK3566四核處理器，Laval鴻蒙社區(qū)推薦開發(fā)板，已適配全新OpenHarmony5.0 Release系統(tǒng)，SDK源碼全開放！

關(guān)閉Selinux

修改以下路徑文件：

adevice/rockchip/common/BoardConfig.mk

修改代碼如下：

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

注意："+"號為修改內(nèi)容。

注釋用戶組權(quán)限檢測

修改以下路徑文件：system/extras/su/su.cpp

修改代碼如下：

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："+"號為修改內(nèi)容。

?給su文件默認授予root權(quán)限修改以下路徑文件：system/core/libcutils/fs_config.cpp

修改代碼如下：

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" },

修改以下路徑文件：
frameworks/base/core/jni/com_android_internal_os_Zygote.cpp

修改代碼如下：

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)));
}
}
}
+ */
}

修改以下路徑文件：kernel/security/commoncap.c

修改代碼如下：

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："+"號為修改內(nèi)容。

源碼編譯并測試

修改完上面三個步驟的文件后，即可在源碼根目錄下編譯安卓源碼：

# make -j4

下載Root Checker(ROOT檢查工具)，通過ADB命令或者U盤安裝后，打開按照提示點擊按鈕檢測ROOT，如圖：