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Boot MagiskInit as actual system-as-root

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WIP, no customization. DO NOT USE YET!
This commit is contained in:
topjohnwu
2019-06-23 15:14:47 -07:00
parent 28cd6a75e7
commit 9ec8bc2166
5 changed files with 93 additions and 29 deletions
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native/jni/init/init.cpp
+31 -15
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@@ -132,6 +132,14 @@ void LegacyInit::preset() {
rename("/.backup/init", "/init");
}
void SARInit::preset() {
full_read("/init", &self.buf, &self.sz);
LOGD("Cleaning rootfs\n");
root = open("/", O_RDONLY | O_CLOEXEC);
frm_rf(root, { "proc", "sys" });
}
void SARCompatInit::preset() {
full_read("/init", &self.buf, &self.sz);
@@ -140,23 +148,19 @@ void SARCompatInit::preset() {
frm_rf(root, { "overlay", "proc", "sys" });
}
void MagiskInit::start() {
// Prevent file descriptor confusion
mknod("/null", S_IFCHR | 0666, makedev(1, 3));
int null = open("/null", O_RDWR | O_CLOEXEC);
unlink("/null");
xdup3(null, STDIN_FILENO, O_CLOEXEC);
xdup3(null, STDOUT_FILENO, O_CLOEXEC);
xdup3(null, STDERR_FILENO, O_CLOEXEC);
if (null > STDERR_FILENO)
close(null);
void RootFSInit::start() {
preset();
early_mount();
setup_rootfs();
re_exec_init();
}
void SARInit::start() {
preset();
early_mount();
re_exec_init();
}
class RecoveryInit : public BaseInit {
public:
RecoveryInit(char *argv[], cmdline *cmd) : BaseInit(argv, cmd) {};
@@ -168,13 +172,12 @@ public:
}
};
class TestInit : public SARCompatInit {
class TestInit : public SARInit {
public:
TestInit(char *argv[], cmdline *cmd) : SARCompatInit(argv, cmd) {};
TestInit(char *argv[], cmdline *cmd) : SARInit(argv, cmd) {};
void start() override {
preset();
early_mount();
setup_rootfs();
cleanup();
}
};
@@ -210,6 +213,16 @@ int main(int argc, char *argv[]) {
if (getpid() != 1)
return 1;
setup_klog();
// Prevent file descriptor confusion
mknod("/null", S_IFCHR | 0666, makedev(1, 3));
int null = open("/null", O_RDWR | O_CLOEXEC);
unlink("/null");
xdup3(null, STDIN_FILENO, O_CLOEXEC);
xdup3(null, STDOUT_FILENO, O_CLOEXEC);
xdup3(null, STDERR_FILENO, O_CLOEXEC);
if (null > STDERR_FILENO)
close(null);
}
cmdline cmd{};
@@ -219,7 +232,10 @@ int main(int argc, char *argv[]) {
if (run_test) {
init = make_unique<TestInit>(argv, &cmd);
} else if (cmd.system_as_root) {
init = make_unique<SARCompatInit>(argv, &cmd);
if (access("/overlay", F_OK) == 0) /* Compatible mode */
init = make_unique<SARCompatInit>(argv, &cmd);
else
init = make_unique<SARInit>(argv, &cmd);
} else {
decompress_ramdisk();
if (access("/sbin/recovery", F_OK) == 0)