https://nalar.dev/tags/memfd/ Recent content in Memfd on Nalar Hugo en-us Thu, 17 Sep 2026 00:00:00 +0000 https://nalar.dev/memfd-seals-turn-shared-memory-into-monotonic-file-policy/ Thu, 17 Sep 2026 00:00:00 +0000 https://nalar.dev/memfd-seals-turn-shared-memory-into-monotonic-file-policy/ <h1 id="memfd-seals-turn-shared-memory-into-monotonic-file-policy">Memfd Seals Turn Shared Memory Into Monotonic File Policy</h1> <p>A process prepares a binary object in memory, passes its file descriptor to another process, and expects the bytes to remain stable after validation. Ordinary shared memory does not provide that property by itself: another holder of writable authority can change the object after a check, resize it, or keep a writable mapping alive. Linux file seals provide a narrower contract. They remove selected mutation operations from a sealable file, and successfully added seals cannot later be removed.</p>