[Soot-list] Modifying initial values fields of method.
Sam Blackshear
samuel.blackshear at colorado.edu
Tue Feb 17 12:16:55 EST 2015
Hi Roman,
I think the reason that your transformation isn't working is that javac
is optimizing away your fields. Inlining of static final field reads for
fields with primitive or String types is one of the only compile-time
optimizations the Java compiler knows how to do. You may be able to get
around this in some other way, but I don't think you'll see those field
reads in the bytecode.
- Sam
On Tue, Feb 17, 2015 at 10:10 AM, Roman Petriev <vvpiroman at gmail.com> wrote:
> Test class:
>
> public class Decomp {
>
> private static final String FUUU = "fdgsfdhsrthd";
> private static final String AAAA = "olololo";
>
> public static void main(String[] args) {
>
> System.out.println(FUUU);
> System.out.println(AAAA);
>
> }
>
> }
>
> Test transformation:
>
> @Override
> protected void internalTransform(Body body, String phaseName,
> Map<String, String> options) {
>
> System.out.println(body.getMethod().getSignature());
>
> int weight = soot.jbco.Main.getWeight(phaseName,
> body.getMethod().getSignature());
> if (weight == 0){
> return;
> }
>
> System.out.println(" --- --- --- --- --- --- ");
>
> QueueReader<Edge> edgeList = Scene.v().getCallGraph().listener();
> while (edgeList.hasNext()) {
> Edge edge = edgeList.next();
> if(edge.isClinit() &&
> edge.src().getDeclaringClass().getName().equalsIgnoreCase(body.getMethod().getDeclaringClass().getName())){
> System.out.println(edge.src().getName());
> System.out.println(edge.tgt().getName());
>
> Iterator<Unit> itu =
> edge.tgt().getActiveBody().getUnits().snapshotIterator();
> while(itu.hasNext()){
> Unit u = itu.next();
> System.out.println(" --- unit : " + u.toString());
> }
>
> System.out.println("PL size : " +
> edge.tgt().getActiveBody().getParameterLocals().size());
> System.out.println("DB size : " +
> edge.tgt().getActiveBody().getDefBoxes().size());
> }
>
> }
> System.out.println(" --- --- --- --- --- --- ");
> }
>
>
> Hope this helps.
>
>
> 2015-02-17 9:25 GMT+03:00 Bodden, Eric <eric.bodden at sit.fraunhofer.de>:
>
>> Roman can you post here the entire and unmodified source code of the
>> respective class?
>>
>> Cheers,
>> Eric
>>
>> > On 16.02.2015, at 23:52, Roman Petriev <vvpiroman at gmail.com> wrote:
>> >
>> > I tried to use call graph from scene and I found clinit!
>> > But ... It contains in my test app:
>> >
>> > staticinvoke <java.lang.Object: void registerNatives()>()
>> > return
>> >
>> > or
>> >
>> > staticinvoke <java.lang.System: void registerNatives()>()
>> > <java.lang.System: java.io.InputStream in> = null
>> > <java.lang.System: java.io.PrintStream out> = null
>> > <java.lang.System: java.io.PrintStream err> = null
>> > <java.lang.System: java.lang.SecurityManager security> = null
>> > <java.lang.System: java.io.Console cons> = null
>> > return
>> >
>> > But I want to get/set String constant ...
>> >
>> >
>> > P.s. Thanks for any help!
>> >
>> >
>> > 2015-02-17 0:29 GMT+03:00 Marc Miltenberger <Marc.Miltenberger at cased.de
>> >:
>> > The method is called <clinit> and has the subsignature
>> > void <clinit>()
>> >
>> > Am 16.02.2015 um 21:56 schrieb Roman Petriev:
>> > > Well ... How can I get access to clinit with soot? BodyTransformer
>> > > couldn't find this method.
>> > >
>> > > 2015-02-16 21:58 GMT+03:00 Marc-André Laverdière
>> > > <marc-andre.laverdiere-papineau at polymtl.ca
>> > > <mailto:marc-andre.laverdiere-papineau at polymtl.ca>>:
>> > >
>> > > If the field is static, then it will be in clinit...
>> > >
>> > > Marc-André Laverdière-Papineau
>> > > Doctorant - PhD Candidate
>> > >
>> > > On 16/02/15 01:25 PM, Roman Petriev wrote:
>> > > > Unfortunately, it didn't help :( ....
>> > > >
>> > > > Simplest <init> contains 3 items, e.g.:
>> > > >
>> > > > r0 := @this: decomp.Decomp
>> > > > specialinvoke r0.<java.lang.Object: void <init>()>()
>> > > > return
>> > > >
>> > > > Decomp class contains 2 constants.
>> > > >
>> > > > Do you have any ideas else?
>> > > >
>> > > > P.s. javap:
>> > > >
>> > > > private static final java.lang.String FUUU;
>> > > > Signature: Ljava/lang/String;
>> > > > flags: ACC_PRIVATE, ACC_STATIC, ACC_FINAL
>> > > >
>> > > > ConstantValue: String fdgsfdhsrthd
>> > > >
>> > > >
>> > > > private static final java.lang.String AAAA;
>> > > > Signature: Ljava/lang/String;
>> > > > flags: ACC_PRIVATE, ACC_STATIC, ACC_FINAL
>> > > >
>> > > > ConstantValue: String olololo
>> > > >
>> > > > Probably, constants were initialized somewhere else ...
>> > > >
>> > > >
>> > > > 2015-02-16 14:22 GMT+03:00 Bodden, Eric <
>> eric.bodden at sit.fraunhofer.de <mailto:eric.bodden at sit.fraunhofer.de>
>> > > > <mailto:eric.bodden at sit.fraunhofer.de
>> > > <mailto:eric.bodden at sit.fraunhofer.de>>>:
>> > > >
>> > > > Hi Roman.
>> > > >
>> > > > You will find the appropriate assignment within the body of
>> the
>> > > > method <init> within SomeClass. You need to modify the
>> assignment there.
>> > > >
>> > > > Hope this helps,
>> > > > Eric
>> > > >
>> > > > > On 16.02.2015, at 11:15, Roman Petriev <
>> vvpiroman at gmail.com <mailto:vvpiroman at gmail.com>
>> > > > <mailto:vvpiroman at gmail.com <mailto:vvpiroman at gmail.com>>>
>> wrote:
>> > > > >
>> > > > > I do body transformation (Jimple) for JBCO, and I need
>> to do this
>> > > > for code obfuscation.
>> > > > >
>> > > > > 2015-02-16 13:10 GMT+03:00 Roman Petriev <
>> vvpiroman at gmail.com <mailto:vvpiroman at gmail.com>
>> > > > <mailto:vvpiroman at gmail.com <mailto:vvpiroman at gmail.com>>>:
>> > > > > Ok.
>> > > > >
>> > > > > E.g.:
>> > > > >
>> > > > > public class SomeClass{
>> > > > >
>> > > > > //I want to get/set value of this constant.
>> > > > > private final String SOME_PARAMETER = "value";
>> > > > >
>> > > > > public static void main(String[] args) {
>> > > > >
>> > > > > //................
>> > > > >
>> > > > > }
>> > > > > }
>> > > > >
>> > > > > It's possible?
>> > > > >
>> > > > >
>> > > > > 2015-02-16 9:26 GMT+03:00 Bodden, Eric
>> > > > <eric.bodden at sit.fraunhofer.de
>> > > <mailto:eric.bodden at sit.fraunhofer.de>
>> > > <mailto:eric.bodden at sit.fraunhofer.de
>> > > <mailto:eric.bodden at sit.fraunhofer.de>>>:
>> > > > > Hi Roman.
>> > > > >
>> > > > > If you describe your problem in more detail then there
>> is a
>> > > > better chance that people will be able to help you out.
>> > > > >
>> > > > > Best wishes,
>> > > > > Eric Bodden
>> > > > >
>> > > > > > On 15.02.2015, at 22:22, Roman Petriev <
>> vvpiroman at gmail.com <mailto:vvpiroman at gmail.com>
>> > > > <mailto:vvpiroman at gmail.com <mailto:vvpiroman at gmail.com>>>
>> wrote:
>> > > > > >
>> > > > > > Hi all!
>> > > > > >
>> > > > > > I want to get/set initial value of method field
>> > > > (java.lang.String). How I can do it?
>> > > > > >
>> > > > > > Best regards,
>> > > > > > Roman.
>> > > > > >
>> > > > > > _______________________________________________
>> > > > > > Soot-list mailing list
>> > > > > > Soot-list at CS.McGill.CA <mailto:Soot-list at CS.McGill.CA>
>> > > <mailto:Soot-list at CS.McGill.CA <mailto:Soot-list at CS.McGill.CA>>
>> > > > > >
>> https://mailman.CS.McGill.CA/mailman/listinfo/soot-list
>> > > > >
>> > > > > --
>> > > > > Prof. Eric Bodden, Ph.D., http://sse.ec-spride.de/
>> > > http://bodden.de/
>> > > > > Head of Secure Software Engineering at Fraunhofer SIT, TU
>> > > > Darmstadt and EC SPRIDE
>> > > > > Tel: +49 6151 16-75422 Fax: +49 6151 869-127
>> > > > > Room B5.11, Fraunhofer SIT, Rheinstraße 75, 64295
>> Darmstadt
>> > > > >
>> > > > >
>> > > > >
>> > > >
>> > > > --
>> > > > Prof. Eric Bodden, Ph.D., http://sse.ec-spride.de/
>> > > http://bodden.de/
>> > > > Head of Secure Software Engineering at Fraunhofer SIT, TU
>> > > Darmstadt
>> > > > and EC SPRIDE
>> > > > Tel: +49 6151 16-75422 Fax: +49 6151 869-127
>> > > > Room B5.11, Fraunhofer SIT, Rheinstraße 75, 64295 Darmstadt
>> > > >
>> > > >
>> > > >
>> > > >
>> > > > _______________________________________________
>> > > > Soot-list mailing list
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>> > > > https://mailman.CS.McGill.CA/mailman/listinfo/soot-list
>> > > >
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>> > > https://mailman.CS.McGill.CA/mailman/listinfo/soot-list
>> > >
>> > >
>> > >
>> > >
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>> > > https://mailman.CS.McGill.CA/mailman/listinfo/soot-list
>> > >
>> >
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>>
>> --
>> Prof. Eric Bodden, Ph.D., http://sse.ec-spride.de/ http://bodden.de/
>> Head of Secure Software Engineering at Fraunhofer SIT, TU Darmstadt and
>> EC SPRIDE
>> Tel: +49 6151 16-75422 Fax: +49 6151 869-127
>> Room B5.11, Fraunhofer SIT, Rheinstraße 75, 64295 Darmstadt
>>
>>
>
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