[Soot-list] Modifying initial values fields of method.
Steven Arzt
Steven.Arzt at cased.de
Tue Feb 17 16:13:13 EST 2015
This ldc instruction should be converted to an assignment of the respective constant value from the pool. Additionally, you should have a ConstantValueTag on the SootField. Take the code I sent you and see what Jimple code you get. Then check for the tags associated with the SootField.
Von: soot-list-bounces at CS.McGill.CA [mailto:soot-list-bounces at CS.McGill.CA] Im Auftrag von Roman Petriev
Gesendet: Dienstag, 17. Februar 2015 22:07
An: Steven Arzt
Cc: soot-list at cs.mcgill.ca
Betreff: Re: [Soot-list] Modifying initial values fields of method.
Thanks! I will follow your advice.
But we still have a question to discuss - "ldc" instruction use strings from constant pool. I want to modify values in pool with soot.
2015-02-17 21:47 GMT+03:00 Steven Arzt <Steven.Arzt at cased.de>:
If the ldc instruction is there, Soot will transform it into the respective Jimple instruction.
However, you code is overly complex. Try this:
SootMethod sm = Scene.v().getMethod(“<Decomp: void <clinit>>”);
For (Unit u : sm.getActiveBody.getUnits())
System.out.println(u);
This assumes that your class Decomp does not reside in a package, otherwise you need to add that to the method signature passed to getMethod().
Put this code into the internalTransform method of a SceneTransformer. You don’t need a callgraph for this, that just makes the whole thing much more complex than necessary.
Von: soot-list-bounces at CS.McGill.CA [mailto:soot-list-bounces at CS.McGill.CA] Im Auftrag von Roman Petriev
Gesendet: Dienstag, 17. Februar 2015 19:07
An: Sam Blackshear
Cc: soot-list at cs.mcgill.ca
Betreff: Re: [Soot-list] Modifying initial values fields of method.
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.
> > > > >
> > > > > _______________________________________________
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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 <tel:%2B49%206151%2016-75422> Fax: +49 6151 869-127 <tel:%2B49%206151%20869-127>
> > > > 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 <tel:%2B49%206151%2016-75422> Fax: +49 6151 869-127 <tel:%2B49%206151%20869-127>
> > > Room B5.11, Fraunhofer SIT, Rheinstraße 75, 64295 Darmstadt
> > >
> > >
> > >
> > >
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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 <tel:%2B49%206151%2016-75422> Fax: +49 6151 869-127 <tel:%2B49%206151%20869-127>
Room B5.11, Fraunhofer SIT, Rheinstraße 75, 64295 Darmstadt
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