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replace PackageInfo.CREATOR to hook creation of PackageInfo in all Parcel api (#117) 

* replace PackageInfo.CREATOR to hook creation of PackageInfo in all Parcel api

* also clear Parcel.sPairedCreators
This commit is contained in:
Bob Pan 2022-10-14 21:31:58 +08:00 committed by GitHub
parent eb870b593d
commit 030e1e54bc
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 39 additions and 58 deletions
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71
patch-loader/src/main/java/org/lsposed/lspatch/loader/LSPApplication.java
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@ -1,6 +1,5 @@
package org.lsposed.lspatch.loader;
import static android.os.Parcelable.PARCELABLE_WRITE_RETURN_VALUE;
import static org.lsposed.lspatch.share.Constants.CONFIG_ASSET_PATH;
import static org.lsposed.lspatch.share.Constants.ORIGINAL_APK_ASSET_PATH;
@ -12,8 +11,8 @@ import android.content.pm.PackageInfo;
import android.content.pm.Signature;
import android.content.res.CompatibilityInfo;
import android.os.Build;
import android.os.IBinder;
import android.os.Parcel;
import android.os.Parcelable;
import android.system.Os;
import android.util.Log;
@ -243,42 +242,18 @@ public class LSPApplication {
return field.getInt(null);
}
private static void bypassSignature(Context context) throws ClassNotFoundException, IllegalAccessException, NoSuchFieldException {
final int TRANSACTION_getPackageInfo = getTranscationId("android.content.pm.IPackageManager$Stub", "TRANSACTION_getPackageInfo");
XposedHelpers.findAndHookMethod("android.os.BinderProxy", null, "transact", int.class, Parcel.class, Parcel.class, int.class, new XC_MethodHook() {
private static void bypassSignature(Context context) {
String packageName = context.getPackageName();
Parcelable.Creator<PackageInfo> originalCreator = PackageInfo.CREATOR;
Parcelable.Creator<PackageInfo> proxiedCreator = new Parcelable.Creator<PackageInfo>() {
@Override
protected void afterHookedMethod(MethodHookParam param) throws Throwable {
try {
Object object = param.thisObject;
int id = (int) param.args[0];
Parcel write = (Parcel) param.args[1];
Parcel out = (Parcel) param.args[2];
// forward check
if (write == null || out == null) {
return;
}
// prevent recurise call
if (id == IBinder.INTERFACE_TRANSACTION) {
return;
}
String desc = (String) XposedHelpers.callMethod(object, "getInterfaceDescriptor");
if (desc == null || desc.isEmpty() || !desc.equals("android.content.pm.IPackageManager")) {
return;
}
if (id == TRANSACTION_getPackageInfo) {
out.readException();
if (0 != out.readInt()) {
PackageInfo packageInfo = PackageInfo.CREATOR.createFromParcel(out);
if (packageInfo.packageName.equals(context.getApplicationInfo().packageName)) {
public PackageInfo createFromParcel(Parcel source) {
PackageInfo packageInfo = originalCreator.createFromParcel(source);
if (packageInfo.packageName.equals(packageName)) {
if (packageInfo.signatures != null && packageInfo.signatures.length > 0) {
XLog.d(TAG, "Replace signature info (method 1)");
packageInfo.signatures[0] = new Signature(config.originalSignature);
}
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
if (packageInfo.signingInfo != null) {
XLog.d(TAG, "Replace signature info (method 2)");
@ -288,24 +263,30 @@ public class LSPApplication {
}
}
}
out.setDataPosition(0);
out.setDataSize(0);
out.writeNoException();
out.writeInt(1);
packageInfo.writeToParcel(out, PARCELABLE_WRITE_RETURN_VALUE);
}
return packageInfo;
}
// reset pos
out.setDataPosition(0);
@Override
public PackageInfo[] newArray(int size) {
return originalCreator.newArray(size);
}
} catch (Throwable err) {
// should not happen, just crash app
throw new IllegalStateException("lsp hook error", err);
};
XposedHelpers.setStaticObjectField(PackageInfo.class, "CREATOR", proxiedCreator);
try {
Map<?, ?> mCreators = (Map<?, ?>) XposedHelpers.getStaticObjectField(Parcel.class, "mCreators");
mCreators.clear();
} catch (NoSuchFieldError ignore) {
} catch (Throwable e) {
Log.w(TAG, "fail to clear Parcel.mCreators", e);
}
try {
Map<?, ?> sPairedCreators = (Map<?, ?>) XposedHelpers.getStaticObjectField(Parcel.class, "sPairedCreators");
sPairedCreators.clear();
} catch (NoSuchFieldError ignore) {
} catch (Throwable e) {
Log.w(TAG, "fail to clear Parcel.sPairedCreators", e);
}
});
}
private static void doSigBypass(Context context) throws IllegalAccessException, ClassNotFoundException, IOException, NoSuchFieldException {