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only cache offsets that require IO #89

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Merged
vvb2060 merged 1 commit into from
Oct 20, 2025
Merged

only cache offsets that require IO #89

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9 changes: 1 addition & 8 deletions library/src/androidTest/java/org/lsposed/hiddenapibypass/HiddenApiBypassTest.java
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Original file line number Diff line number Diff line change
Expand Up @@ -11,7 +11,6 @@
import android.content.pm.ApplicationInfo;
import android.graphics.drawable.ClipDrawable;
import android.os.Build;
import android.os.Process;

import androidx.test.ext.junit.runners.AndroidJUnit4;
import androidx.test.filters.SdkSuppress;
Expand Down Expand Up @@ -165,20 +164,14 @@ class X {
public void PtestCachedOffset() {
var context = InstrumentationRegistry.getInstrumentation().getContext();
var artVersion = Helper.getArtVersion(context);
var isOld = artVersion == -1L;
var isNew = artVersion >= 36_00_00000L;
var is64bit = Process.is64Bit();
var data = new long[10];
var data = new long[6];
data[0] = 24;
data[1] = 12;
data[2] = 24;
data[3] = 48;
data[4] = 40;
data[5] = isNew ? 40 : 56;
data[6] = isOld ? is64bit ? 40 : 28 : is64bit ? 32 : 24;
data[7] = is64bit ? 8 : 4;
data[8] = 16;
data[9] = 4;
assertArrayEquals("art version " + artVersion, data, Helper.getCachedOffsetData());
}

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3 changes: 2 additions & 1 deletion library/src/main/java/org/lsposed/hiddenapibypass/Helper.java
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Original file line number Diff line number Diff line change
Expand Up @@ -49,7 +49,7 @@ public static long[] getCachedOffsetData() {
}

public static void setCachedOffsetData(long[] data) {
if (cachedOffsetData != null || data.length != 10) return;
if (cachedOffsetData != null || data.length != 6) return;
cachedOffsetData = data;

if (cacheFile == null) return;
Expand All @@ -63,6 +63,7 @@ public static void setCachedOffsetData(long[] data) {
}

public static void enableOffsetCache(Context context) {
if (cacheFile != null) return;
cacheFile = new File(context.getCacheDir(), "HiddenApiBypass");
artVersion = getArtVersion(context);

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55 changes: 30 additions & 25 deletions library/src/main/java/org/lsposed/hiddenapibypass/HiddenApiBypass.java
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Expand Up @@ -63,7 +63,7 @@ public final class HiddenApiBypass {
unsafe = (Unsafe) Unsafe.class.getDeclaredMethod("getUnsafe").invoke(null);
var data = Helper.getCachedOffsetData();
if (data == null) {
data = readOffsetData();
data = readOffsetDataIO();
Helper.setCachedOffsetData(data);
} else if (BuildConfig.DEBUG) {
Log.d(TAG, "Using cached offset data");
Expand All @@ -74,18 +74,18 @@ public final class HiddenApiBypass {
methodsOffset = data[3];
iFieldOffset = data[4];
sFieldOffset = data[5];
artMethodSize = data[6];
artMethodBias = data[7];
artFieldSize = data[8];
artFieldBias = data[9];
var dataRT = readOffsetDataRT();
artMethodSize = dataRT[0];
artMethodBias = dataRT[1];
artFieldSize = dataRT[2];
artFieldBias = dataRT[3];
} catch (ReflectiveOperationException e) {
Log.e(TAG, "Initialize error", e);
throw new ExceptionInInitializerError(e);
}

}

private static long[] readOffsetData() throws ReflectiveOperationException {
private static long[] readOffsetDataIO() throws ReflectiveOperationException {
ClassLoader bootClassloader = new CoreOjClassLoader();
Class<?> executableClass = bootClassloader.loadClass(Executable.class.getName());
Class<?> methodHandleClass = bootClassloader.loadClass(MethodHandle.class.getName());
Expand All @@ -95,16 +95,27 @@ private static long[] readOffsetData() throws ReflectiveOperationException {
var artOffset = unsafe.objectFieldOffset(methodHandleClass.getDeclaredField("artFieldOrMethod"));
var methodsOffset = unsafe.objectFieldOffset(classClass.getDeclaredField("methods"));

long iField;
long sField;
long iFieldOffset;
long sFieldOffset;
try {
iField = unsafe.objectFieldOffset(classClass.getDeclaredField("fields"));
sField = iField;
iFieldOffset = unsafe.objectFieldOffset(classClass.getDeclaredField("fields"));
sFieldOffset = iFieldOffset;
} catch (NoSuchFieldException e) {
iField = unsafe.objectFieldOffset(classClass.getDeclaredField("iFields"));
sField = unsafe.objectFieldOffset(classClass.getDeclaredField("sFields"));
iFieldOffset = unsafe.objectFieldOffset(classClass.getDeclaredField("iFields"));
sFieldOffset = unsafe.objectFieldOffset(classClass.getDeclaredField("sFields"));
}

long[] data = new long[6];
data[0] = methodOffset;
data[1] = classOffset;
data[2] = artOffset;
data[3] = methodsOffset;
data[4] = iFieldOffset;
data[5] = sFieldOffset;
return data;
}

private static long[] readOffsetDataRT() throws ReflectiveOperationException {
Method mA = Helper.NeverCall.class.getDeclaredMethod("a");
Method mB = Helper.NeverCall.class.getDeclaredMethod("b");
mA.setAccessible(true);
Expand All @@ -129,25 +140,19 @@ private static long[] readOffsetData() throws ReflectiveOperationException {
MethodHandle mhJ = MethodHandles.lookup().unreflectGetter(fJ);
long iAddr = unsafe.getLong(mhI, artOffset);
long jAddr = unsafe.getLong(mhJ, artOffset);
long iFields = unsafe.getLong(Helper.NeverCall.class, iField);
long iFields = unsafe.getLong(Helper.NeverCall.class, iFieldOffset);
var artFieldSize = jAddr - iAddr;
if (BuildConfig.DEBUG) Log.v(TAG, artFieldSize + " " +
Long.toString(iAddr, 16) + ", " +
Long.toString(jAddr, 16) + ", " +
Long.toString(iFields, 16));
var artFieldBias = iAddr - iFields;

long[] data = new long[10];
data[0] = methodOffset;
data[1] = classOffset;
data[2] = artOffset;
data[3] = methodsOffset;
data[4] = iField;
data[5] = sField;
data[6] = artMethodSize;
data[7] = artMethodBias;
data[8] = artFieldSize;
data[9] = artFieldBias;
long[] data = new long[4];
data[0] = artMethodSize;
data[1] = artMethodBias;
data[2] = artFieldSize;
data[3] = artFieldBias;
return data;
}

Expand Down