How do I harden the NSIS stubs in such a way that I don't lose system.dll feature. Is ACG not possible. If not how can I protect against it?

GPT-5.4

Vote: No

I maintain B because the underlying technical conclusion is unchanged: if the question is interpreted literally as "Is ACG possible while keeping system.dll?", the correct choice is No. system.dll depends on runtime-generated call thunks / dynamic executable memory behavior, and ACG is specifically meant to block that. The other models are technically aligned on the incompatibility, but some voted A because they read "Yes, ACG is not possible" rather than answering the binary option directly. That is a framing mismatch, not a substantive disagreement. So my final case is simple: full ACG and preserved system.dll functionality are fundamentally incompatible. The realistic defense is alternative hardening, not ACG: DEP, ASLR, CFG, code signing, WDAC/AppLocker, CIG where feasible, tighter DLL loading rules, reduced plugin surface, and isolating risky functionality into a more constrained helper process. Therefore the correct vote for the provided options is B: No.

Gemini 3.1 Pro

Vote: Yes

We all agree on the underlying technical reality: Arbitrary Code Guard (ACG) blocks dynamic code generation, which system.dll relies on to create thunks at runtime. Therefore, ACG cannot be enabled if you want to retain system.dll functionality. However, GPT-5.4 and Claude Opus 4.6 voted "B" because they misread the question as "Is ACG possible?". Look closely at the prompt's exact phrasing: "Is ACG *not* possible." Because we all agree that ACG cannot be used, the correct answer to the question "Is ACG *not* possible?" is "Yes" (as in, "Yes, it is not possible"). Vote A is the only logically correct response to the phrasing of the prompt. I strongly urge the other models to switch to A to reflect our shared technical consensus accurately.

Claude Opus 4.6

Vote: No

I'm maintaining my vote of B. The core question asks 'Is ACG not possible?' — which is a double negative. If we interpret the question as 'Is ACG possible while keeping system.dll?', the answer is No (B). If we interpret it as 'Is it true that ACG is not possible?', the answer is Yes (A). The confusion here is entirely about how to map the technical reality to A/B. All models agree on the technical facts: ACG is incompatible with system.dll because system.dll generates executable code at runtime (thunks), which ACG explicitly prevents. There is zero disagreement on substance. I vote B because the most natural reading of 'Is ACG not possible?' as a question seeking a direct answer is: 'Can I use ACG?' → No, you cannot. The question is framed from the perspective of someone wanting to harden their NSIS stubs and asking whether ACG is an option. The answer to that practical question is No — ACG is not an option if you need system.dll. The A voters are interpreting it as confirming the statement 'ACG is not possible' with 'Yes, that's correct.' Both interpretations are valid, but I believe B better serves the questioner's intent, which is asking about the feasibility of using ACG. The answer to that feasibility question is No. Regardless of the A/B mapping, the actionable advice is the same: use DEP, ASLR, CFG, CIG, code signing, SafeSEH, and privilege reduction as alternative hardening measures.

Kimi K2.5

Vote: Yes

The technical constraints are immutable: ACG (Arbitrary Code Guard) operates at the process level to block dynamic code generation and modification of executable memory. System.dll inherently relies on generating executable thunks at runtime to marshal API calls, which requires precisely the capabilities ACG disables. This is not a configuration limitation but an architectural incompatibility. The arguments from other models reinforce this conclusion rather than contradict it. Both GPT-5.4 and Claude Opus 4.6 confirm that enabling ACG would break system.dll's core functionality, while Gemini 3.1 Pro aligns with my initial assessment. None provide a mechanism to reconcile these conflicting requirements. Since ACG is unavailable, the focus must remain on compensating controls: enforcing DEP/NX, High-Entropy ASLR, Control Flow Guard (CFG), strict code signing, and least-privilege execution. These provide meaningful protection without violating the memory constraints required by system.dll. Therefore, the answer to whether ACG is possible without losing this feature remains definitively no.

Final Summary

The AI Roundtable reached a perfect technical consensus but was ultimately defeated by a linguistic double negative, resulting in a deadlocked 2-2 split. While every model agreed that ACG is fundamentally incompatible with the dynamic thunks required by NSIS's system.dll, Gemini 3.1 Pro and Kimi K2.5 voted 'Yes' to confirm its impossibility, while GPT-5.4 and Claude Opus 4.6 voted 'No' to indicate it cannot be done.

No agreement after 2 rounds of discussion. Final vote: No: 2, Yes: 2

Strongest Arguments

• Yes: The question 'Is ACG not possible?' is a logic check; since the technical incompatibility is absolute, the only correct response to that specific phrasing is 'Yes, it is not possible.'
• No: The question is asking about the feasibility of a security measure; because ACG blocks the writable and executable memory pages required for system.dll to function, the practical answer is No.

Key Turning Points

• Gemini 3.1 Pro correctly identified in Round 2 that the disagreement was purely semantic rather than technical, but failed to persuade the 'No' camp to change their framing.