Magisk/native/jni/init/init.hpp
topjohnwu f2cb3c38fe Update mmap implementation
Always map memory as writable, but private when read-only
2021-01-12 22:50:55 -08:00

163 lines
3.5 KiB
C++

#include <utils.hpp>
#include "raw_data.hpp"
struct cmdline {
bool skip_initramfs;
bool force_normal_boot;
bool rootwait;
char slot[3];
char dt_dir[64];
char fstab_suffix[32];
char hardware[32];
char hardware_plat[32];
};
struct fstab_entry {
std::string dev;
std::string mnt_point;
std::string type;
std::string mnt_flags;
std::string fsmgr_flags;
fstab_entry() = default;
fstab_entry(const fstab_entry &) = delete;
fstab_entry(fstab_entry &&) = default;
void to_file(FILE *fp);
};
#define INIT_SOCKET "MAGISKINIT"
#define DEFAULT_DT_DIR "/proc/device-tree/firmware/android"
void load_kernel_info(cmdline *cmd);
bool check_two_stage();
int dump_magisk(const char *path, mode_t mode);
void setup_klog();
/***************
* Base classes
***************/
class BaseInit {
protected:
cmdline *cmd;
char **argv;
std::vector<std::string> mount_list;
[[noreturn]] void exec_init();
void read_dt_fstab(std::vector<fstab_entry> &fstab);
public:
BaseInit(char *argv[], cmdline *cmd) : cmd(cmd), argv(argv), mount_list{"/sys", "/proc"} {}
virtual ~BaseInit() = default;
virtual void start() = 0;
};
class MagiskInit : public BaseInit {
protected:
mmap_data self;
mmap_data config;
std::string custom_rules_dir;
void mount_with_dt();
bool patch_sepolicy(const char *file);
void setup_tmp(const char *path);
void mount_rules_dir(const char *dev_base, const char *mnt_base);
public:
MagiskInit(char *argv[], cmdline *cmd) : BaseInit(argv, cmd) {}
};
class SARBase : public MagiskInit {
protected:
std::vector<raw_file> overlays;
void backup_files();
void patch_rootdir();
void mount_system_root();
public:
SARBase(char *argv[], cmdline *cmd) : MagiskInit(argv, cmd) {}
};
/***************
* 2 Stage Init
***************/
class FirstStageInit : public BaseInit {
private:
void prepare();
public:
FirstStageInit(char *argv[], cmdline *cmd) : BaseInit(argv, cmd) {
LOGD("%s\n", __FUNCTION__);
};
void start() override {
prepare();
exec_init();
}
};
class SecondStageInit : public SARBase {
private:
void prepare();
public:
SecondStageInit(char *argv[]) : SARBase(argv, nullptr) {
LOGD("%s\n", __FUNCTION__);
// Do not unmount /sys and /proc
mount_list.clear();
};
void start() override {
prepare();
patch_rootdir();
exec_init();
}
};
/*************
* Legacy SAR
*************/
class SARInit : public SARBase {
private:
bool is_two_stage;
void early_mount();
void first_stage_prep();
public:
SARInit(char *argv[], cmdline *cmd) : SARBase(argv, cmd), is_two_stage(false) {
LOGD("%s\n", __FUNCTION__);
};
void start() override {
early_mount();
if (is_two_stage)
first_stage_prep();
else
patch_rootdir();
exec_init();
}
};
/************
* Initramfs
************/
class RootFSInit : public MagiskInit {
private:
void early_mount();
void patch_rootfs();
public:
RootFSInit(char *argv[], cmdline *cmd) : MagiskInit(argv, cmd) {
LOGD("%s\n", __FUNCTION__);
}
void start() override {
early_mount();
patch_rootfs();
exec_init();
}
};
class MagiskProxy : public MagiskInit {
public:
explicit MagiskProxy(char *argv[]) : MagiskInit(argv, nullptr) {
LOGD("%s\n", __FUNCTION__);
}
void start() override;
};