[Soot-list] Modifying initial values fields of method.
Roman Petriev
vvpiroman at gmail.com
Tue Feb 17 13:06:37 EST 2015
Thanks, Sam. I saw "ldc" instruction in byte code. (Description: push a
constant *#index* from a constant pool (String, int or float) onto the
stack)
So ... I need to modify constant pool, isn't it? Could I do it with soot?
How?
2015-02-17 20:16 GMT+03:00 Sam Blackshear <samuel.blackshear at colorado.edu>:
> 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
>>> > >
>>> > >
>>> > >
>>> > >
>>> > > _______________________________________________
>>> > > Soot-list mailing list
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>>> > > https://mailman.CS.McGill.CA/mailman/listinfo/soot-list
>>> > >
>>> >
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>>> >
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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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>>
>
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