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IL2CPP: Auto-detect re-arranged struct field obfuscation (#44, #98)

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Katy Coe
2020-11-25 12:17:20 +01:00
parent dc85a54c5f
commit c07c13be24
1 changed files with 19 additions and 0 deletions
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19
Il2CppInspector.Common/IL2CPP/Il2CppBinary.cs
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@@ -208,6 +208,25 @@ namespace Il2CppInspector
CodeRegistration = Image.ReadMappedObject<Il2CppCodeRegistration>(codeRegistration);
MetadataRegistration = Image.ReadMappedObject<Il2CppMetadataRegistration>(metadataRegistration);
// Do basic validatation that MetadataRegistration and CodeRegistration are sane
/*
* TODO: Validation can be greatly expanded upon later, eg. pointers in these two structs should actually be pointers
* GlobalMethodPointers (<= 24.1) must be a series of pointers in il2cpp or .text, and in sequential order
* FieldOffsetPointers (>= 21.1) must be a series of pointers in __const or zero, and in sequential order
* typeRefPointers must be a series of pointers in __const
* MethodInvokePointers must be a series of pointers in __text or .text, and in sequential order
*/
if (MetadataRegistration.typesCount < MetadataRegistration.typeDefinitionsSizesCount
|| MetadataRegistration.genericClassesCount < MetadataRegistration.genericInstsCount
|| MetadataRegistration.genericMethodTableCount < MetadataRegistration.genericInstsCount
|| CodeRegistration.reversePInvokeWrapperCount > 0x1000
|| CodeRegistration.unresolvedVirtualCallCount > 0x4000 // >= 22
|| CodeRegistration.interopDataCount > 0x1000 // >= 23
|| (Image.Version <= 24.1 && CodeRegistration.invokerPointersCount > CodeRegistration.methodPointersCount))
throw new NotSupportedException("The detected Il2CppCodeRegistration / Il2CppMetadataRegistration structs do not pass validation. This may mean that their fields have been re-ordered as a form of obfuscation - this scenario is not currently supported by Il2CppInspector. Consider re-ordering the fields in Il2CppBinaryClasses.cs and try again.");
// TODO: Determine the correct field order for MetadataRegistration and CodeRegistration (#44, #98)
// The global method pointer list was deprecated in v24.2 in favour of Il2CppCodeGenModule
if (Image.Version <= 24.1)
GlobalMethodPointers = Image.ReadMappedArray<ulong>(CodeRegistration.pmethodPointers, (int) CodeRegistration.methodPointersCount);