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 X-Spam-Level: X-Spam-Status: No, score=-0.9 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 20A30C2BC61 for ; Mon, 29 Oct 2018 03:43:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BBEA92084A for ; Mon, 29 Oct 2018 03:43:12 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=linaro.org header.i=@linaro.org header.b="jJwLfHws" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org BBEA92084A Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linaro.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729333AbeJ2MaB (ORCPT ); Mon, 29 Oct 2018 08:30:01 -0400 Received: from mail-qt1-f169.google.com ([209.85.160.169]:45234 "EHLO mail-qt1-f169.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729257AbeJ2MaB (ORCPT ); Mon, 29 Oct 2018 08:30:01 -0400 Received: by mail-qt1-f169.google.com with SMTP id l9-v6so7679747qtj.12 for ; Sun, 28 Oct 2018 20:43:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=date:from:to:cc:subject:in-reply-to:message-id:references :user-agent:mime-version; bh=mgQKg5cpqf/fe95yBECr7IuD+GRxZjLjv0KQk4WR33c=; b=jJwLfHwsxX12LlCz7xNgooeXXqEX4f8QQMK/abnKniLrTN+bpcAcAkcvhVYSyAaxpb mTcr36CMwwXiECn268ewbuTU0NVv+KWzsHXVvdKqmbULe8u7lNM/fWQ7tmVujcPsqTk7 HSsWZFvYK88AitYo0vKYTiEM3Zgjd/zTXsrT8= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:in-reply-to:message-id :references:user-agent:mime-version; bh=mgQKg5cpqf/fe95yBECr7IuD+GRxZjLjv0KQk4WR33c=; b=MGG6ASiKrXjysV2Wgm/TcO7YSNZJDBAgMP640kUMCpO4eOUOW92iTFn2NfccelUoHe sDfa/ZuxiwrcRl4j0ED2l+R9aqwPt9Hrnrjtqe560XywqEQFY+37mOhT4PosjsPri1Yi GUEwjs0j2OQgjdA9mVwaHvsgdMilv3xX2DF9/Epg5rJtophNclfaCItH2klAdwZ5GP5y myJYBWbpz+mLWqDByPPaIZWAeGtEHWjIzoMogzHnJvu9StCtdEMPjE4PxEEeDb9YyFKG HrxbD7JH0WlUGx9BRTWxeFs9sgFAogDt3SaZV2UEYKN320M5jXWjooagqTg2xX6Yrngp XhXQ== X-Gm-Message-State: AGRZ1gILZQuCEGpq+Rxe8FYykrvq1Feibcs0MDRqUfZ6258+5s9O7eDD 7ZebNMb+hFdZYB8OhG7d45j916NzC/c= X-Google-Smtp-Source: AJdET5ceh1cVT1ezbvHTpUi5frUkzQpphM19EX7hdvg1Ig8m+ETjYe3GY6QcaPW3Lht1Dh2NG3NgKg== X-Received: by 2002:a0c:884d:: with SMTP id 13mr11691203qvm.170.1540784589553; Sun, 28 Oct 2018 20:43:09 -0700 (PDT) Received: from xanadu.home (modemcable228.104-82-70.mc.videotron.ca. [70.82.104.228]) by smtp.gmail.com with ESMTPSA id p31sm2879309qkh.86.2018.10.28.20.43.08 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Sun, 28 Oct 2018 20:43:08 -0700 (PDT) Date: Sun, 28 Oct 2018 23:43:07 -0400 (EDT) From: Nicolas Pitre To: Anatoly Trosinenko cc: linux-kernel@vger.kernel.org Subject: Re: Cramfs: "unable to handle kernel paging request" when reading a file from a fuzzed FS image In-Reply-To: Message-ID: References: User-Agent: Alpine 2.21 (LFD 202 2017-01-01) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, 28 Oct 2018, Anatoly Trosinenko wrote: > Hello, > > When reading a file from a fuzzed cramfs image, unhandled kernel > paging request occurs. Hmmm... It doesn't show up on my test system. > How to reproduce with kvm-xfstests: > 1) Checkout the v4.19 tag, copy x86_64-config-4.14 to .config, perform > `make olddefconfig` > 2) Enable Cramfs in the config, then compile > 3) In the `kvm-xfstests shell` perform: > > root@kvm-xfstests:~# mount /vtmp > root@kvm-xfstests:~# mount /vtmp/cramfs.img /mnt How do I populate /vtmp? Mine is empty at this point. I imagine I should put the cramfs image somewhere on the host, but I'm not that familiar withkvm. Nicolas