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Use app data dir to detect GMS package

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Prevent injecting into unrelated apps because apps can use whatever process name. This effectively restores df20bdb but with null checks added to prevent crash.

Reference: topjohnwu/Magisk@07c22cc

Co-authored-by: chiteroman <98092901+chiteroman@users.noreply.github.com>
Co-authored-by: Wang Han <416810799@qq.com>
This commit is contained in:
osm0sis
2024-01-22 19:03:03 -04:00
parent 63e4c571bf
commit 0b34f95282
1 changed files with 23 additions and 12 deletions
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35
app/src/main/cpp/main.cpp
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@@ -93,21 +93,30 @@ public:
bool isGms = false, isGmsUnstable = false;
auto rawProcess = env->GetStringUTFChars(args->nice_name, nullptr);
auto rawDir = env->GetStringUTFChars(args->app_data_dir, nullptr);
if (rawProcess) {
std::string_view process(rawProcess);
isGms = process.starts_with("com.google.android.gms");
isGmsUnstable = process.compare("com.google.android.gms.unstable") == 0;
// Prevent crash on apps with no data dir
if (rawDir == nullptr) {
env->ReleaseStringUTFChars(args->nice_name, rawProcess);
api->setOption(zygisk::DLCLOSE_MODULE_LIBRARY);
return;
}
std::string_view process(rawProcess);
std::string_view dir(rawDir);
isGms = dir.ends_with("/com.google.android.gms");
isGmsUnstable = process == "com.google.android.gms.unstable";
env->ReleaseStringUTFChars(args->nice_name, rawProcess);
env->ReleaseStringUTFChars(args->app_data_dir, rawDir);
if (!isGms) {
api->setOption(zygisk::DLCLOSE_MODULE_LIBRARY);
return;
}
// We are in GMS now, force unmount
api->setOption(zygisk::FORCE_DENYLIST_UNMOUNT);
if (!isGmsUnstable) {
@@ -115,7 +124,9 @@ public:
return;
}
std::vector<char> jsonVector;
long dexSize = 0, jsonSize = 0;
int fd = api->connectCompanion();
read(fd, &dexSize, sizeof(long));
@@ -135,22 +146,22 @@ public:
return;
}
LOGD("Read from file descriptor for 'dex' -> %ld bytes", dexSize);
LOGD("Read from file descriptor for 'json' -> %ld bytes", jsonSize);
dexVector.resize(dexSize);
read(fd, dexVector.data(), dexSize);
std::vector<char> jsonVector(jsonSize);
jsonVector.resize(jsonSize);
read(fd, jsonVector.data(), jsonSize);
close(fd);
LOGD("Read from file descriptor for 'dex' -> %ld bytes", dexSize);
LOGD("Read from file descriptor for 'json' -> %ld bytes", jsonSize);
std::string data(jsonVector.cbegin(), jsonVector.cend());
json = nlohmann::json::parse(data, nullptr, false, true);
std::string jsonString(jsonVector.cbegin(), jsonVector.cend());
json = nlohmann::json::parse(jsonString, nullptr, false, true);
jsonVector.clear();
data.clear();
jsonString.clear();
}
void postAppSpecialize(const zygisk::AppSpecializeArgs *args) override {