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Fix magiskinit

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The behavior of C and C++ is slightly different, and causes unable to set excl_list
This commit is contained in:
topjohnwu 2018-11-08 06:07:52 -05:00
parent ef9d463bd7
commit 07718b994a
1 changed files with 17 additions and 13 deletions
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30
native/jni/misc/init.cpp
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@ -48,10 +48,10 @@
#define DEFAULT_DT_DIR "/proc/device-tree/firmware/android" #define DEFAULT_DT_DIR "/proc/device-tree/firmware/android"
int (*init_applet_main[]) (int, char *[]) = { magiskpolicy_main, magiskpolicy_main, NULL }; int (*init_applet_main[]) (int, char *[]) = { magiskpolicy_main, magiskpolicy_main, nullptr };
struct cmdline { struct cmdline {
char skip_initramfs; bool skip_initramfs;
char slot[3]; char slot[3];
char dt_dir[128]; char dt_dir[128];
}; };
@ -72,14 +72,14 @@ static void parse_cmdline(struct cmdline *cmd) {
int fd = open("/proc/cmdline", O_RDONLY | O_CLOEXEC); int fd = open("/proc/cmdline", O_RDONLY | O_CLOEXEC);
cmdline[read(fd, cmdline, sizeof(cmdline))] = '\0'; cmdline[read(fd, cmdline, sizeof(cmdline))] = '\0';
close(fd); close(fd);
for (char *tok = strtok(cmdline, " "); tok; tok = strtok(NULL, " ")) { for (char *tok = strtok(cmdline, " "); tok; tok = strtok(nullptr, " ")) {
if (strncmp(tok, "androidboot.slot_suffix", 23) == 0) { if (strncmp(tok, "androidboot.slot_suffix", 23) == 0) {
sscanf(tok, "androidboot.slot_suffix=%s", cmd->slot); sscanf(tok, "androidboot.slot_suffix=%s", cmd->slot);
} else if (strncmp(tok, "androidboot.slot", 16) == 0) { } else if (strncmp(tok, "androidboot.slot", 16) == 0) {
cmd->slot[0] = '_'; cmd->slot[0] = '_';
sscanf(tok, "androidboot.slot=%c", cmd->slot + 1); sscanf(tok, "androidboot.slot=%c", cmd->slot + 1);
} else if (strcmp(tok, "skip_initramfs") == 0) { } else if (strcmp(tok, "skip_initramfs") == 0) {
cmd->skip_initramfs = 1; cmd->skip_initramfs = true;
} else if (strncmp(tok, "androidboot.android_dt_dir", 26) == 0) { } else if (strncmp(tok, "androidboot.android_dt_dir", 26) == 0) {
sscanf(tok, "androidboot.android_dt_dir=%s", cmd->dt_dir); sscanf(tok, "androidboot.android_dt_dir=%s", cmd->dt_dir);
} }
@ -114,7 +114,7 @@ static int setup_block(struct device *dev, const char *partname) {
char path[128]; char path[128];
struct dirent *entry; struct dirent *entry;
DIR *dir = opendir("/sys/dev/block"); DIR *dir = opendir("/sys/dev/block");
if (dir == NULL) if (dir == nullptr)
return 1; return 1;
int found = 0; int found = 0;
while ((entry = readdir(dir))) { while ((entry = readdir(dir))) {
@ -352,9 +352,9 @@ int main(int argc, char *argv[]) {
// Communicate with kernel using procfs and sysfs // Communicate with kernel using procfs and sysfs
mkdir("/proc", 0755); mkdir("/proc", 0755);
xmount("proc", "/proc", "proc", 0, NULL); xmount("proc", "/proc", "proc", 0, nullptr);
mkdir("/sys", 0755); mkdir("/sys", 0755);
xmount("sysfs", "/sys", "sysfs", 0, NULL); xmount("sysfs", "/sys", "sysfs", 0, nullptr);
struct cmdline cmd; struct cmdline cmd;
parse_cmdline(&cmd); parse_cmdline(&cmd);
@ -369,8 +369,10 @@ int main(int argc, char *argv[]) {
if (cmd.skip_initramfs) { if (cmd.skip_initramfs) {
// Clear rootfs // Clear rootfs
excl_list = (const char *[]) { "overlay", ".backup", "proc", "sys", "init.bak", NULL }; const char *excl[] = { "overlay", ".backup", "proc", "sys", "init.bak", nullptr };
excl_list = excl;
frm_rf(root); frm_rf(root);
excl_list = nullptr;
} else { } else {
// Revert original init binary // Revert original init binary
link("/.backup/init", "/init"); link("/.backup/init", "/init");
@ -394,25 +396,27 @@ int main(int argc, char *argv[]) {
sprintf(partname, "system%s", cmd.slot); sprintf(partname, "system%s", cmd.slot);
setup_block(&dev, partname); setup_block(&dev, partname);
xmkdir("/system_root", 0755); xmkdir("/system_root", 0755);
xmount(dev.path, "/system_root", "ext4", MS_RDONLY, NULL); xmount(dev.path, "/system_root", "ext4", MS_RDONLY, nullptr);
int system_root = open("/system_root", O_RDONLY | O_CLOEXEC); int system_root = open("/system_root", O_RDONLY | O_CLOEXEC);
// Clone rootfs except /system // Clone rootfs except /system
excl_list = (const char *[]) { "system", NULL }; const char *excl[] = { "overlay", ".backup", "proc", "sys", "init.bak", nullptr };
excl_list = excl;
clone_dir(system_root, root); clone_dir(system_root, root);
excl_list = nullptr;
close(system_root); close(system_root);
xmkdir("/system", 0755); xmkdir("/system", 0755);
xmount("/system_root/system", "/system", NULL, MS_BIND, NULL); xmount("/system_root/system", "/system", nullptr, MS_BIND, nullptr);
} else if (read_fstab_dt(&cmd, "system", partname) == 0) { } else if (read_fstab_dt(&cmd, "system", partname) == 0) {
setup_block(&dev, partname); setup_block(&dev, partname);
xmount(dev.path, "/system", "ext4", MS_RDONLY, NULL); xmount(dev.path, "/system", "ext4", MS_RDONLY, nullptr);
mnt_system = true; mnt_system = true;
} }
if (read_fstab_dt(&cmd, "vendor", partname) == 0) { if (read_fstab_dt(&cmd, "vendor", partname) == 0) {
setup_block(&dev, partname); setup_block(&dev, partname);
xmount(dev.path, "/vendor", "ext4", MS_RDONLY, NULL); xmount(dev.path, "/vendor", "ext4", MS_RDONLY, nullptr);
mnt_vendor = true; mnt_vendor = true;
} }