From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B6BF6C4332F for ; Wed, 14 Dec 2022 20:15:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230094AbiLNUPb (ORCPT ); Wed, 14 Dec 2022 15:15:31 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48706 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229850AbiLNUOh (ORCPT ); Wed, 14 Dec 2022 15:14:37 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 496F92DAAE for ; Wed, 14 Dec 2022 12:04:59 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1671048298; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=+0tEQ05NQldNFQ3k4Hd8AFQ3sr6rhffixZ6eCviwSyM=; b=TkBmAysYwdQoI/Flesq5zHlzopWR7IWlIwV931jnE/37XAngxrDegeECkIL8bld0jHpbXG L+h9SNRKC14AjY1IbixRWCLTgng8o3U4Awbuj2uh1BFutBWUp41LJfV+eLTsjgl1jaLv4Z IfitIm6x64DXmlK+LYpv86TK62k2NdA= Received: from mail-qt1-f198.google.com (mail-qt1-f198.google.com [209.85.160.198]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_128_GCM_SHA256) id us-mta-381-aKthudGxNkS1ffqaDkWl_Q-1; Wed, 14 Dec 2022 15:04:57 -0500 X-MC-Unique: aKthudGxNkS1ffqaDkWl_Q-1 Received: by mail-qt1-f198.google.com with SMTP id l11-20020ac8148b000000b003a81fbc3b3bso3072388qtj.12 for ; Wed, 14 Dec 2022 12:04:57 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=+0tEQ05NQldNFQ3k4Hd8AFQ3sr6rhffixZ6eCviwSyM=; b=1TWf03VRMhLn5UFQVVF5csKKID8dfJBA0+bCo7Q51vCd1uzoGIV6hEhKfzB2GIR3KQ 6tydktQSHBMorzUfyhZeiGL+kuo5oOZzyfVp0IqqbrAmRrodZGaDci+xpdO1Wu83tG29 8dxyVDtuxp2hSK9wVSfJWM24dYdtVnOT6IVuqCbVZJMkBgnpCh09AJzuj+bhZ8Fp+N0m lMaYuA+bfz1Iov+fUsYoFH8gnbvxelyyCdye9T4J1PAPT5EkHqeCLEYKQmp3LdRys1Bn yY0yxOxDv1CJoDtlu2VagozvMaXgYz+AfP6dB6WpEjsN0/Y8CWgbEax8eWGDmvLrj73p MJ6w== X-Gm-Message-State: ANoB5plOa6bvVBGdmAx4DFhtYnac5clKGgv++/OVmvyAlls7kx/PaaFy fTalKJ0YywT4qlvESLQPxQ/GZSMIQ7RWaX9M+VL7FqHL+JWdeBOdxmF0ejS3OD41RrxxMxAEq49 EJUcvL/AKPWHh3H8zxnwSuOdSheoblKofXTe5A7Jd2KPrSlExHURi/77M3YM1Dg+AHGIdhvZHjg == X-Received: by 2002:ac8:7148:0:b0:3a8:faf:296a with SMTP id h8-20020ac87148000000b003a80faf296amr21615883qtp.54.1671048296190; Wed, 14 Dec 2022 12:04:56 -0800 (PST) X-Google-Smtp-Source: AA0mqf61MiKdzyQd0u/ypYXorFpfgYGbyvVMeTrVNxGFhAntVd9JJHdDk3vcTBJAO8sRiCNxRyYGtw== X-Received: by 2002:ac8:7148:0:b0:3a8:faf:296a with SMTP id h8-20020ac87148000000b003a80faf296amr21615862qtp.54.1671048295900; Wed, 14 Dec 2022 12:04:55 -0800 (PST) Received: from x1n.redhat.com (bras-base-aurron9127w-grc-45-70-31-26-132.dsl.bell.ca. [70.31.26.132]) by smtp.gmail.com with ESMTPSA id l11-20020ac848cb000000b003a689a5b177sm2199352qtr.8.2022.12.14.12.04.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 14 Dec 2022 12:04:54 -0800 (PST) From: Peter Xu To: linux-kernel@vger.kernel.org, linux-mm@kvack.org Cc: Andrea Arcangeli , Pengfei Xu , peterx@redhat.com, Nadav Amit , David Hildenbrand , Andrew Morton , Miaohe Lin , Huang Ying Subject: [PATCH 0/2] mm: Fixes on pte markers Date: Wed, 14 Dec 2022 15:04:51 -0500 Message-Id: <20221214200453.1772655-1-peterx@redhat.com> X-Mailer: git-send-email 2.37.3 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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