ZipAlign

[timscriptov]

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Please build libzipalign.so

[JonForShort]

Hi @TimScriptov , you can find zipalign here for android-11.

https://github.com/JonForShort/android-tools/tree/master/build/android-11.0.0_r33/zipalign

[timscriptov]

Hi @JonForShort

https://developer.android.com/about/versions/10/behavior-changes-10

Untrusted apps that target Android 10 cannot invoke exec() on files within the app's home directory. This execution of files from the writable app home directory is a W^X violation. Apps should load only the binary code that's embedded within an app's APK file.

Need used libzipalign.so for Android 10+

[timscriptov]

C++:

#include <cstdlib>
#include <jni.h>
#include <zipalign/ZipAlign.h>

using namespace android;

extern "C"
JNIEXPORT jboolean
JNICALL Java_com_android_zipalign_ZipAlign_process
(JNIEnv *env, jclass clazz, jstring inZipFile, jstring outZipFile, jint alignment, jboolean force, jboolean zopfli, jboolean pageAlignSharedLibs) {
    const char *inFileName = env->GetStringUTFChars(inZipFile, nullptr);
    const char *outFileName = env->GetStringUTFChars(outZipFile, nullptr);
    if(!inFileName || !outFileName) {
        return JNI_FALSE;
    }
    if (process(inFileName, outFileName, alignment, force, zopfli, pageAlignSharedLibs) == 0) return JNI_TRUE;
    return JNI_FALSE;
}

extern "C"
JNIEXPORT jboolean
JNICALL Java_com_android_zipalign_ZipAlign_verify
(JNIEnv *env, jclass clazz, jstring inZipFile, jint alignment, jboolean verbose, jboolean pageAlignSharedLibs) {
    const char *inFileName = env->GetStringUTFChars(inZipFile, nullptr);
    if(!inFileName) {
        return JNI_FALSE;
    }
    if(verify(inFileName, alignment, verbose, pageAlignSharedLibs) == 0) return JNI_TRUE;
    return JNI_FALSE;
}

Java:

package com.android.zipalign;

public class ZipAlign {
    static {
        System.loadLibrary("zipalign");
    }

    public static native boolean process(String inZipFile, String outZipFile, int alignment, boolean force, boolean pageAlignSharedLibs);

    public static native boolean verify(String inZipFile, int alignment, boolean verbose, boolean pageAlignSharedLibs);
}

[JonForShort]

Thanks @TimScriptov . I can add this as well. I am currently working on getting aapt working for android-11, but I'll work on your request next.

Just a quick question regarding the home app restriction, have you tried executing it from your app's cache directory? Technically, this is different than your home directory but just something I was curious about.

[JonForShort]

For my own reference, this is the target that will need to be built.

https://android.googlesource.com/platform/build/+/master/tools/zipalign/Android.bp#21

[timscriptov]

Thanks @TimScriptov . I can add this as well. I am currently working on getting aapt working for android-11, but I'll work on your request next.

Just a quick question regarding the home app restriction, have you tried executing it from your app's cache directory? Technically, this is different than your home directory but just something I was curious about.

Thanks, aapt it cool!

I myself have already assembled the code I need, but I'm not sure about 100% of the assembly's performance. I will be looking forward to your further updates.

[timscriptov]

Just a quick question regarding the home app restriction, have you tried executing it from your app's cache directory? Technically, this is different than your home directory but just something I was curious about.

If TargetSdk is 28 or less, then binaries work.

If TargetSdk is 29 or higher then binaries do not work (Permission denied)

[SectionTN]

@TimScriptov as far i know in new api you can only execute binaries from app root folder (data/data/com.whatever.idk/files/ if you know sketchware it can execute binaries from root folder with context.getFilesDir() , you can check out the modded source and see how AAPT and AAPT2 get executed : https://github.com/Sketchware-Pro/Sketchware-Pro/blob/75d4a528a8d01ef12647d07ed68cbb835f30de54/app/src/main/java/a/a/a/Dp.java#L116

[SectionTN]

this work even in API 30

[SectionTN]

yes, working

[timscriptov]

I have already said that you cannot run binaries on API 29 (If targetSdkVersion=29+)