Support .so libiary

[kaixuanluo]

The description: I want handle change voice record data, It need use c++ .so libiary to hook the voice record method and hanle change the record byte[] data, But the .so only support load in current process, in Activity load is work, not support load in class witch implements IXposedHookLoadPackage, I need use the .so libiary in the xposed, what shoud i do.

The hook code: final Class<?> audioRecordClazz = findClass("android.media.AudioRecord", lpparam.classLoader); The libiary load code: System.loadLibrary("soundtouch"); // System.load("/data/data/gg.xvoicechanger/files/libsoundtouch.so"); The log: Caused by: java.lang.UnsatisfiedLinkError: dalvik.system.PathClassLoader[DexPathList[[zip file "/data/app/gg.xvoicechanger-1/base.apk"],nativeLibraryDirectories=[/system/lib, /vendor/lib]]] couldn't find "libsoundtouch.so" The system: Android 7.1.2, Xposed-v87

[rovo89]

Is your .so file (and all its parent directories) world-readable? Your hook is executed in the context of the app you hooked. Usually, apps don't have access to other apps' data files.

[kaixuanluo]

Even .so file world-readable, in android 7.0 , also throw (is not accessible for the namespace "classloader-namespace" ) java.lang.UnsatisfiedLinkError: dlopen failed: library "/sdcard/XVoiceChanger/libsoundtouch.so" needed or dlopened by "/system/lib64/libnativeloader.so" is not accessible for the namespace "classloader-namespace"

[rovo89]

Yep, that's a change they have introduced to limit access to non-public libraries: https://developer.android.com/about/versions/nougat/android-7.0-changes.html#ndk

Anything on /data and /mnt/expand should be whitelisted though: https://android.googlesource.com/platform/system/core/+/nougat-release/libnativeloader/native_loader.cpp#43

But /sdcard is not whitelisted.

[kaixuanluo]

Add the .so name to whitelist ? I've write the .so name to /etc/public.libraries.txt, And copy the .so to /system/lib/ And /system/lib64(in 64 bit phone),

The phone(oneplus 3T ,64 bit, android 7.1.1) can't reboot, system error, phone can't work, can't get logs.

And the phone (xiaomi4 ,32bit, android 7.1.1) can load the .so. libiary.

[rovo89]

Yeah, different devices might behave differently, e.g. because one might have dm-verity enabled (which ensures that no changes to /system were done). That could cause the reboot.

Anyway, I'm going to close this as it's not an Xposed issue. You'd have the same issue if you tried to load a foreign library from a normal app. As mentioned above, putting the .so file somewhere under /data should work, but then you need to take care that the file permissions are set correctly, i.e. they must be world-readable (maybe even executable) for the file and the directories above it.