[Soot-list] instrument interface class causes dexopt failed error

[Steven Arzt]

Hi Zipeng,

 

Did you mark the “Instrument” class  and the interface as application classes? Only application classes will be written out to the new dex file.

 

Best regards,

  Steven

 

Von: soot-list-bounces at CS.McGill.CA [mailto:soot-list-bounces at CS.McGill.CA] Im Auftrag von fox tiny
Gesendet: Donnerstag, 2. April 2015 15:01
An: soot-list at CS.McGill.CA
Betreff: [Soot-list] instrument interface class causes dexopt failed error

 

Hi all,

 

      While instrumentation of android apps, if the injected class contains an interface, the instrumented apk cannot be installed in Android successfully, a dexopt error is reported.

 

    my instrumentation code is  shown below. It replaces the startActivity statement with a static function f() defined in class Instrument

 

   protected void internalTransform(final Body body, String s, Map<String, String> stringStringMap) {

        

        final PatchingChain units = body.getUnits();

 

        for (Iterator<Unit> iter = units.snapshotIterator(); iter.hasNext(); ) {

            final Unit u = iter.next();

            u.apply(new AbstractStmtSwitch() {

                @Override

                public void caseInvokeStmt(InvokeStmt stmt) {

                    InvokeExpr invokeExpr = stmt.getInvokeExpr();

                    if (invokeExpr instanceof InstanceInvokeExpr &&

                            invokeExpr.getMethod().getName().equals("startActivity")) {

 

                        SootClass instrumentClass = Scene.v().getSootClass("Instrument");

                        SootMethod instrumentMethod = instrumentClass.getMethodByName("f");

 

                        List<Value> args = new ArrayList<Value>();

                        Unit insertStmt = Jimple.v().newInvokeStmt(

                                Jimple.v().newStaticInvokeExpr(instrumentMethod.makeRef(),args)

                        );

                        units.insertBefore(insertStmt, stmt);

                        units.remove(stmt);

                        body.validate();

                    }

 

                }

            });

        }

    }

 

The Instrument.java is defined below:

 

import A;

public class Instrument {

    public static int f() {

        A a = A.Stub.asInterface();

        return a.f();

    }

}

 

and class A is defined as an interface 

 

public interface A  {

    public int f();

 

    public static abstract class Stub implements A {

        public static A asInterface() {

            return new AImpl();

        }

    }

}

 

class AImpl implements A {

 

    @Override

    public int f() {

        return 0;

    }

}

 

Is the interface class output into the apk incorrectly?

 

Thanks a lot!

 

Zipeng Zhang

 

 

 

 

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