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universalisos/third_party/hardened_malloc/PROVENANCE.md

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hardened_malloc — Vendored Copy Provenance

Vendored into: universalisos/third_party/hardened_malloc/ Date: 2026-07-11 Track: T8-1.1 (hardened_malloc Import & Separation-Model Adoption)

Source

  • Upstream project: GrapheneOS hardened_malloc — https://github.com/GrapheneOS/hardened_malloc
  • Vendored from (local fork clone): portugalfuturista/hardened_malloc (git@github.com:portugalfuturista/hardened_malloc.git)
  • Branch: main
  • Commit: 1976e09730897c49906dea4ce054ca937c47e0be (2026-07-10) — "Update README.md to properly use CONFIG_N_ARENA for make invocations"

What this is

A security-focused general-purpose memory allocator providing the malloc API, hardened against heap-corruption vulnerabilities. Portable C23; supports Bionic (Android), musl, and glibc (explicitly prefers musl). 64-bit only. OpenBSD-malloc-derived design with per-size-class regions at random bases (PartitionAlloc-inspired).

License

See LICENSE (MIT-style, GrapheneOS) and CREDITS. Vendored unmodified except removal of the .git/ directory (it was a fork clone). All upstream files preserved: Makefile, Android.bp, config/{default,light}.mk, KERNEL_FEATURE_WISHLIST.md, h_malloc.c memory.c pages.c random.c chacha.c util.c new.cc, include/, test/, preload.sh, README.md, arm_mte.h, memtag.h, mutex.h, androidtest/, third_party/.

Why it is vendored (T8)

hardened_malloc is the designated stepping stone to running multiple concurrent hardened Android/AOSP/LineageOS/GrapheneOS guests inside UniversalisOS. It is the only GrapheneOS component portable across the guest/host boundary (Bionic/musl/glibc). See the master plan §0.14 and TRACK T8 for the full rationale.

Integration targets (per deleg_17082fc4 §2.2)

  1. Freestanding EL2 kernel — NOT a target (no libc, no dynamic allocation).
  2. musl-based POSIX personality — THE primary import target (standalone Makefile, CONFIG_SELF_INIT=true, N_ARENA=4).
  3. Host build tools — opportunistic via preload.sh LD_PRELOAD.
  4. Android guests — inherited via Bionic (platform_bionic h_malloc_wrapper.cpp); UniversalisOS's job is to give each guest's Stage-2 MMU the features in KERNEL_FEATURE_WISHLIST.md (guard pages, high map count, mremap semantics).

Update procedure

To refresh from upstream: re-clone the fork, cp -a over this dir, strip .git/, update the commit hash above, and re-run the acceptance gate (make test).