linux-kernel - [PATCH 0/2] mm: Fixes on pte markers

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Message-Id: <20221214200453.1772655-1-peterx@redhat.com>
Date:   Wed, 14 Dec 2022 15:04:51 -0500
From:   Peter Xu <peterx@...hat.com>
To:     linux-kernel@...r.kernel.org, linux-mm@...ck.org
Cc:     Andrea Arcangeli <aarcange@...hat.com>,
        Pengfei Xu <pengfei.xu@...el.com>, peterx@...hat.com,
        Nadav Amit <nadav.amit@...il.com>,
        David Hildenbrand <david@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Miaohe Lin <linmiaohe@...wei.com>,
        Huang Ying <ying.huang@...el.com>
Subject: [PATCH 0/2] mm: Fixes on pte markers

Patch 1 resolves the syzkiller report from Pengfei.

Patch 2 further harden pte markers when used with the recent swapin error
markers.  The major case is we should persist a swapin error marker after
fork(), so child shouldn't read a corrupted page.

No report so far with patch 2, but it can be somehow tested with things
like:
https://github.com/xzpeter/clibs/blob/master/misc/pageout.c
Plus some hacks.

Please have a look, thanks.

Peter Xu (2):
  mm/uffd: Fix pte marker when fork() without fork event
  mm: Fix a few rare cases of using swapin error pte marker

 mm/hugetlb.c  |  3 +++
 mm/memory.c   | 14 +++++++-------
 mm/mprotect.c |  8 +++++++-
 3 files changed, 17 insertions(+), 8 deletions(-)

-- 
2.37.3