linux-kernel - [PATCH 0/3] mm/hugetlb: Fix selftest failures with write check

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20221003155630.469263-1-peterx@redhat.com>
Date:   Mon,  3 Oct 2022 11:56:27 -0400
From:   Peter Xu <peterx@...hat.com>
To:     linux-kernel@...r.kernel.org, linux-mm@...ck.org
Cc:     peterx@...hat.com, Andrea Arcangeli <aarcange@...hat.com>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        David Hildenbrand <david@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Nadav Amit <nadav.amit@...il.com>
Subject: [PATCH 0/3] mm/hugetlb: Fix selftest failures with write check

Currently akpm mm-unstable fails with uffd hugetlb private mapping test
randomly on a write check.

The initial bisection of that points to the recent pmd unshare series, but
it turns out there's no direction relationship with the series but only
some timing change caused the race to start trigger.

The race should be fixed in patch 1.  Patch 2 is a trivial cleanup on the
similar race with hugetlb migrations, patch 3 comment on the write check
so when anyone read it again it'll be clear why it's there.

Thanks,

Peter Xu (3):
  mm/hugetlb: Fix race condition of uffd missing/minor handling
  mm/hugetlb: Use hugetlb_pte_stable in migration race check
  mm/selftest: uffd: Explain the write missing fault check

 mm/hugetlb.c                             | 62 ++++++++++++++++++++----
 tools/testing/selftests/vm/userfaultfd.c | 22 ++++++++-
 2 files changed, 73 insertions(+), 11 deletions(-)

-- 
2.37.3