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Add preliminary zygote code injection support

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Prototyping the injection setup and a clean "self unloading" mechanism.
This commit is contained in:
topjohnwu
2021-01-06 22:21:17 -08:00
parent cd23d27048
commit 4060c2107c
13 changed files with 281 additions and 102 deletions
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19
native/jni/core/applets.cpp
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@ -8,21 +8,26 @@
#include <selinux.hpp>
#include <utils.hpp>
using namespace std::literals;
using namespace std;
using main_fun = int (*)(int, char *[]);
static main_fun applet_main[] = { su_client_main, resetprop_main, magiskhide_main, nullptr };
[[noreturn]] static void call_applet(int argc, char **argv) {
static int call_applet(int argc, char *argv[]) {
// Applets
string_view base = basename(argv[0]);
for (int i = 0; applet_names[i]; ++i) {
if (strcmp(basename(argv[0]), applet_names[i]) == 0) {
exit((*applet_main[i])(argc, argv));
if (base == applet_names[i]) {
return (*applet_main[i])(argc, argv);
}
}
fprintf(stderr, "%s: applet not found\n", basename(argv[0]));
exit(1);
if (str_starts(base, "app_process")) {
return app_process_main(argc, argv);
}
fprintf(stderr, "%s: applet not found\n", base.data());
return 1;
}
int main(int argc, char *argv[]) {
@ -41,6 +46,6 @@ int main(int argc, char *argv[]) {
}
}
call_applet(argc, argv);
return call_applet(argc, argv);
}

13
native/jni/core/daemon.cpp
View File

@ -189,21 +189,22 @@ static int magisk_log(int prio, const char *fmt, va_list ap) {
return vfprintf(local_log_file.get(), buf, args);
}
static void android_logging() {
#define mlog(prio) [](auto fmt, auto ap){ return magisk_log(ANDROID_LOG_##prio, fmt, ap); }
static void magisk_logging() {
auto in_mem_file = make_stream_fp<byte_stream>(log_buf, log_buf_len);
log_file.reset(in_mem_file.release(), [](FILE *) {
free(log_buf);
log_buf = nullptr;
});
log_cb.d = [](auto fmt, auto ap){ return magisk_log(ANDROID_LOG_DEBUG, fmt, ap); };
log_cb.i = [](auto fmt, auto ap){ return magisk_log(ANDROID_LOG_INFO, fmt, ap); };
log_cb.w = [](auto fmt, auto ap){ return magisk_log(ANDROID_LOG_WARN, fmt, ap); };
log_cb.e = [](auto fmt, auto ap){ return magisk_log(ANDROID_LOG_ERROR, fmt, ap); };
log_cb.d = mlog(DEBUG);
log_cb.i = mlog(INFO);
log_cb.w = mlog(WARN);
log_cb.e = mlog(ERROR);
log_cb.ex = nop_ex;
}
static void daemon_entry(int ppid) {
android_logging();
magisk_logging();
int fd = xopen("/dev/null", O_WRONLY);
xdup2(fd, STDOUT_FILENO);