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First modarith test

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This commit is contained in:
Adam
2015-10-25 19:11:25 -04:00
parent 8e39328eca
commit e81e46c68c
2 changed files with 106 additions and 37 deletions
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82
src/main/java/net/runelite/deob/deobfuscators/arithmetic/ModArith.java
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@@ -68,7 +68,6 @@ public class ModArith implements Deobfuscator
outer:
for (InstructionContext ctx : f.getInstructions())
{
// detect field = constant
if (ctx.getInstruction() instanceof SetFieldInstruction)
{
SetFieldInstruction sfi = (SetFieldInstruction) ctx.getInstruction();
@@ -83,6 +82,7 @@ public class ModArith implements Deobfuscator
{
int it = ldc.getConstantAsInt();
if (DMath.isBig(it))
// field = constant
return true;
}
}
@@ -111,12 +111,14 @@ public class ModArith implements Deobfuscator
{
int i = pci.getConstantAsInt();
if (DMath.isBig(i))
// field = constant * not other field
return true;
}
}
}
}
}
// field * imul
if (!(ctx.getInstruction() instanceof IMul))
continue;
@@ -179,11 +181,12 @@ public class ModArith implements Deobfuscator
return false;
}
static class numgs {
static class AssociatedConstant
{
int value;
boolean other;
}
private MultiValueMap<Field, numgs> values2 = new MultiValueMap();
private MultiValueMap<Field, AssociatedConstant> constants = new MultiValueMap();
private void findUses2()
{
@@ -202,7 +205,7 @@ public class ModArith implements Deobfuscator
continue;
List<InstructionContext> l = this.getInsInExpr(ctx, new HashSet());
boolean other = false;
boolean other = false; // check if this contains another field
for (InstructionContext i : l)
{
if (i.getInstruction() instanceof InvokeInstruction)
@@ -225,10 +228,10 @@ public class ModArith implements Deobfuscator
LDC_W w = (LDC_W) i.getInstruction();
if (w.getConstant().getObject() instanceof Integer)
{
numgs n = new numgs();
AssociatedConstant n = new AssociatedConstant();
n.value = w.getConstantAsInt();
n.other = other;
values2.put(fi.getMyField(), n);
constants.put(fi.getMyField(), n);
}
}
}
@@ -238,7 +241,6 @@ public class ModArith implements Deobfuscator
private void findUses()
{
// XXX Here needs to be able pick up setters like ield489 -= -2129182073, and also constant setters
for (Frame f : execution.processedFrames)
for (InstructionContext ctx : f.getInstructions())
{
@@ -272,6 +274,7 @@ public class ModArith implements Deobfuscator
if (value == 1 || value == 0)
continue;
// field * constant
constantGetters.put(field, value);
}
else if (ctx.getInstruction() instanceof SetFieldInstruction)
@@ -294,6 +297,7 @@ public class ModArith implements Deobfuscator
int i = ldc.getConstantAsInt();
if (DMath.isBig(i))
// field = constant
constantSetters.put(field, i);
}
}
@@ -324,12 +328,13 @@ public class ModArith implements Deobfuscator
if (value2 == 1 || value2 == 0)
continue;
// field = something * constant
constantSetters.put(field, value2);
}
}
}
private Pair guess2(Field field, Collection col, Collection<Integer> constants)
private Pair guess(Field field, Collection<Integer> constants)
{
// multiply each by each,
// lowest number wins
@@ -411,16 +416,16 @@ public class ModArith implements Deobfuscator
}
}
Boolean g = isGetterOrSetter(field, true, col, s1),
g2 = isGetterOrSetter(field, true, col, s2);
boolean g = isGetterOrSetter(field, true, s1),
g2 = isGetterOrSetter(field, true, s2);
if (g == null || g2 == null || g == g2)
if (g == g2)
{
g = isGetterOrSetter(field, false, col, s1);
g2 = isGetterOrSetter(field, false, col, s2);
g = isGetterOrSetter(field, false, s1);
g2 = isGetterOrSetter(field, false, s2);
}
if (g == null || g2 == null || g == g2)
if (g == g2)
System.out.println("BAD " + field.getName() + " " + s1 + " * " + s2 + " = " + smallest + " " + g + " " + g2);
else
{
@@ -442,7 +447,8 @@ public class ModArith implements Deobfuscator
return null;
}
private Boolean isGetterOrSetter(Field field, boolean getter, Collection<numgs> col, int value)
// figure out if value is a getter or setter
private boolean isGetterOrSetter(Field field, boolean getter, int value)
{
Collection<Integer> c;
if (getter)
@@ -469,6 +475,7 @@ public class ModArith implements Deobfuscator
return false;
}
// remove duplicates from a collection
private void removeDupes(Collection<Integer> in)
{
Set set = new HashSet();
@@ -491,31 +498,32 @@ public class ModArith implements Deobfuscator
for (ClassFile cf : group.getClasses())
for (Field f : cf.getFields().getFields())
{
Collection<numgs> col = values2.getCollection(f);
Collection<AssociatedConstant> col = constants.getCollection(f); // all constants in instructions associated with the field
if (col == null)
continue;
{
Collection<numgs> col2 = col.stream().filter(i -> DMath.isBig(i.value)).collect(Collectors.toList());
Collection<Integer> noOther = col2.stream().filter(i -> !i.other).map(i -> i.value).collect(Collectors.toList());
Collection<Integer> other = col2.stream().filter(i -> i.other).map(i -> i.value).collect(Collectors.toList());
other.addAll(noOther);
// filter out non big ones
Collection<AssociatedConstant> col2 = col.stream().filter(i -> DMath.isBig(i.value)).collect(Collectors.toList());
removeDupes(noOther);
removeDupes(other);
if (!isFieldObfuscated(execution, f))
continue;
Pair p = this.guess2(f, null, noOther);
if (p == null)
p = this.guess2(f, null, other);
if (p != null)
{
pairs.add(p);
}
// filer out ones that have another field in the expression
Collection<Integer> noOther = col2.stream().filter(i -> !i.other).map(i -> i.value).collect(Collectors.toList());
Collection<Integer> other = col2.stream().filter(i -> i.other).map(i -> i.value).collect(Collectors.toList());
other.addAll(noOther);
removeDupes(noOther);
removeDupes(other);
if (!isFieldObfuscated(execution, f))
continue;
// guess with constants not associated with other fields
Pair p = this.guess(f, noOther);
if (p == null)
p = this.guess(f, other); // fall back to all constants
if (p != null)
{
pairs.add(p);
}
}
}
@@ -590,7 +598,7 @@ public class ModArith implements Deobfuscator
pairs.clear();
constantGetters.clear();;
constantSetters.clear();
values2.clear();
constants.clear();
execution = new Execution(group);
execution.populateInitialMethods();