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GrapheneOS is an open source privacy and security focused mobile OS with Android app compatibility. Developed by Daniel Micay. GrapheneOS is a young project, and currently only supports Pixel devices, partially due to their strong hardware security.

Open Source

GrapheneOS Source Code




Hardened allocator designed for modern systems. It has integration into Android's Bionic libc and can be used externally with musl and glibc as a dynamic library for use on other Linux-based platforms. It will gain more portability / integration over time.






23 Aug 18

Last Updated

17 May 24

Latest version


Primary Language



1,050 KB







Language Usage

Language Usage

Star History

Star History

Recent Commits

  • Daniel Micay (15 Feb 24)

    update copyright notice

  • Dmitry Muhomor (23 Jan 24)

    mte: use tag 0 for freed slots, stop reserving tag 15

  • Dmitry Muhomor (23 Jan 24)

    amend memory tagging README section Memory tagging is enabled by default in bionic, but can be disabled at any point. Memory tagging can't be re-enabled after it's disabled.

  • Dmitry Muhomor (23 Jan 24)

    memtag_test: add test for MADV_DONTNEED behavior

  • Dmitry Muhomor (23 Jan 24)

    mte: remove util.h dependency from arm_mte.h It's needed for including arm_mte.h into

  • Dmitry Muhomor (23 Jan 24)

    memtag_test: move SEGV code checks to device-side binary

  • Daniel Micay (03 Jan 24)

    remove trailing whitespace

  • Julien Voisin (03 Jan 24)

    Improve a bit the formulation of the MTE documentation

  • Daniel Micay (03 Jan 24)

    update memory tagging documentation

  • Dmitry Muhomor (31 Dec 23)

    android: restore the default SIGABRT handler in fatal_error() async_safe_fatal() calls abort() at the end, which can be intercepted by a custom SIGABRT handler. In particular, crashlytics installs such a handler and tries to fork() after catching SIGABRT. hardened_malloc uses pthread_atfork() to register fork handlers. These handlers try to lock internal hardened_malloc mutexes. If at least one of those mutexes is already locked, which is usually the case, thread that called fatai_error() gets deadlocked, while the other threads (if there are any) continue to run.

  • Christian Göttsche (14 Dec 23)

    README: add note about AppArmor constraint on Debian

  • jvoisin (16 Nov 23)

    Clarify a bit why a particular magic number was chosen

  • Daniel Micay (14 Nov 23)

    Revert "use safe_flag for -fstack-clash-protection" This reverts commit 4171bd164e2ec4cf2546daa2b0f6f95af0d782df.

  • Daniel Micay (08 Nov 23)

    use safe_flag for -fstack-clash-protection

  • jvoisin (05 Nov 23)

    Run the testsuite on multiple compiler versions

  • Dmitry Muhomor (01 Nov 23)

    memtag_test: fix sporadic failures of overflow/underflow tests

  • Daniel Micay (30 Oct 23)

    update README now that MTE is implemented

  • Dmitry Muhomor (30 Oct 23)

    mte: add scudo to CREDITS file

  • Dmitry Muhomor (30 Oct 23)

    mte: add untag_pointer() variant for const pointers

  • Dmitry Muhomor (30 Oct 23)

    mte: update comment about skipped tag array update in deallocate_small()

  • Dmitry Muhomor (30 Oct 23)

    remove an always-true sizeof(u8) assert

  • Dmitry Muhomor (30 Oct 23)

    mte: refactor tag_and_clear_slab_slot() Explicitly call is_memtag_enabled() before calling tag_and_clear_slab_slot() to make it clearer that memory is not zeroed when MTE is disabled.

  • Dmitry Muhomor (30 Oct 23)

    mte: note why 0 tag is excluded

  • Dmitry Muhomor (30 Oct 23)

    mte: note alignment requirements of arm_mte_tag_and_clear_mem()

  • Dmitry Muhomor (30 Oct 23)

    mte: rename arm_mte_store_tags_and_clear() to arm_mte_tag_and_clear_mem()

  • Dmitry Muhomor (29 Oct 23)

    mte: add comment about the reserved slab canary value

  • Dmitry Muhomor (29 Oct 23)

    memtag_test: improve capturing of test results Using debuggerd + logcat parsing is unreliable and slow, print SEGV signal code to stderr instead.

  • Dmitry Muhomor (29 Oct 23)

    memtag_test: improve tag_distinctness test - check that tag distinctess checks are actually reached (it was previously verified manually by looking at the now-removed printf output) - check that only non-reserved tags are used - check that all of non-reserved tags are used - print tag usage statistics at the end of run

  • Dmitry Muhomor (29 Oct 23)

    memtag_test: remove usages of rand() It didn't work correctly due to not being seeded and its usage wasn't necessary.

  • Dmitry Muhomor (29 Oct 23)

    mte: add licensing info for code that was copied from scudo

GrapheneOS Website


GrapheneOS: the private and secure mobile OS

GrapheneOS is a security and privacy focused mobile OS with Android app compatibility.


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  • Location Montreal, Quebec, Canada, NA
  • ISP OVH Hosting Inc.
  • ASN AS16276

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