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Blame-aware Recomposition for Secure Compilation Proofs of Low-Level Compartment Isolation

Basile Schlosser, Jérémy Thibault, Cătălin Hriţcu · 2026 · arXiv (Cornell University)

DOI: 10.48550/arxiv.2610.26054 · cited by 0 works (OpenAlex) · open-access PDF

Arabic

إن ضمانات الأمن المتاحة للبرمجيات المشتركة الموجودة رسميا في لغات غير آمنة مثل C تتوقف على مستوى عال من خلال فرض آلية حماية متكاملة و نموذج الذاكرة المرتبطة ببطاقة. إن التحقق من ميكانيكية التحقق المرتبطة ببطاقة منخفضة للحد من الحجم لا تزال تحدياً كبيراً لتقنيات الإثبات الحالية. وخاصة أن تقنيات الإثبات من Abate et al. لا تزال ناجحة لأن واحدة من خطوات الإثبات الخاصة بهم، التجديد، تتطلب أساساً إخفاء جميع المعلومات حول رمز كل الحجم، وهو أمر لا يمكن الوصول إليه بشكل عملي في المستوى المنخفض. ونحن نقترح توسيع تقنيات الإثبات الخاصة بهم إلى تقنيات

Machine translation (Meta M2M100); the English original follows.

Abstract

The security guarantees of existing formally verified compilers for compartmentalized programs in unsafe languages like C stop at a rather high level, assuming a built-in protection mechanism and a block-based memory model. Verifying a concrete, low-level enforcement mechanism for compartment isolation is still a major challenge for current proof techniques. In particular, Abate et al.'s proof technique fails because one of their proof steps, recomposition, essentially requires hiding all information about the code of each compartment, which is not practically achievable at a low level. We propose an extension of their proof technique to a low-level setting where compartments can fully observe each other's code. To do so, we introduce an overlay semantics that allows us to characterize these observations as a form of undefined behaviour, and we use a novel variant of recomposition that we call blame-aware recomposition, which essentially allows recomposing executions as needed in the original high-level proof technique, even if the low-level context observes the code, because this context is ultimately going to be discarded. We apply this new proof to a compartment isolation mechanism that uses a programmable tag-based reference monitor.

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Topics: Mathematical proof, Computer science, Context (archaeology), Isolation (microbiology), Operational semantics, Programming language

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