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fix: 修复WatermarkPass某些情况下导致栈不平衡的bug

main
walon 2025-08-06 15:21:23 +08:00
parent 1ec6e2f426
commit 246a49f8ba
1 changed files with 25 additions and 12 deletions
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37
Editor/ObfusPasses/WalterMark/WatermarkPass.cs
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@ -122,6 +122,20 @@ namespace Obfuz.ObfusPasses.Watermark
return watermarkInfo;
}
private int GetRandomInsertPosition(List<Instruction> instructions, IRandom random)
{
var insertPositions = instructions
.Select((inst, index) => new { Instruction = inst, Index = index })
.Where(x => x.Instruction.OpCode.FlowControl == FlowControl.Next)
.Select(x => x.Index)
.ToList();
if (insertPositions.Count == 0)
{
return 0; // No valid position to insert
}
return insertPositions[random.NextInt(insertPositions.Count)] + 1;
}
private void AddFieldAccessToSignatureHolder(ModuleDef module, EncryptionScopeInfo encryptionScope, WatermarkInfo watermarkInfo)
{
var insertTargetMethods = module.Types
@ -141,18 +155,18 @@ namespace Obfuz.ObfusPasses.Watermark
{
// Randomly select a method to insert the access
var targetMethod = insertTargetMethods[random.NextInt(insertTargetMethods.Count)];
int insertIndex = random.NextInt(1, targetMethod.Body.Instructions.Count - 3);
var insts = (List<Instruction>)targetMethod.Body.Instructions;
int insertIndex = GetRandomInsertPosition(insts, random);
Instruction nop = Instruction.Create(OpCodes.Nop);
insts.InsertRange(insertIndex, new[]
{
Instruction.CreateLdcI4(random.NextInt(1, 10000000)),
Instruction.Create(OpCodes.Brtrue, insts[insertIndex]),
Instruction.CreateLdcI4(random.NextInt(fieldDef.InitialValue.Length)),
Instruction.Create(OpCodes.Newarr, module.CorLibTypes.Byte),
Instruction.Create(OpCodes.Ldtoken, fieldDef),
Instruction.Create(OpCodes.Call, importer.InitializedArray),
Instruction.CreateLdcI4(random.NextInt(1, 10000000)),
Instruction.Create(OpCodes.Brtrue, nop),
Instruction.CreateLdcI4(random.NextInt(fieldDef.InitialValue.Length)),
Instruction.Create(OpCodes.Newarr, module.CorLibTypes.Byte),
Instruction.Create(OpCodes.Ldtoken, fieldDef),
Instruction.Create(OpCodes.Call, importer.InitializedArray),
nop,
});
//Debug.Log($"Inserted watermark access for field '{fieldDef.Name}' in method '{targetMethod.FullName}' at index {insertIndex}.");
}
@ -189,8 +203,7 @@ namespace Obfuz.ObfusPasses.Watermark
// Randomly select a method to insert the IL sequence
var targetMethod = insertTargetMethods[random.NextInt(insertTargetMethods.Count)];
var insts = (List<Instruction>)targetMethod.Body.Instructions;
int insertIndex = random.NextInt(1, insts.Count - 3);
int insertIndex = GetRandomInsertPosition(insts, random);
var insertInstructions = new List<Instruction>()
{
Instruction.CreateLdcI4(random.NextInt(1, 10000000)),
@ -204,7 +217,7 @@ namespace Obfuz.ObfusPasses.Watermark
insertInstructions.Add(Instruction.Create(GetRandomBinOpCode(random)));
}
}
insertInstructions.Add(Instruction.Create(OpCodes.Brfalse, insertInstructions[0]));
insertInstructions.Add(Instruction.Create(OpCodes.Pop));
insts.InsertRange(insertIndex, insertInstructions);
intIndex += ldcCount;