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=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no 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 313E4C2D0BF for ; Thu, 5 Dec 2019 10:42:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0B1E62464D for ; Thu, 5 Dec 2019 10:42:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729235AbfLEKml (ORCPT ); Thu, 5 Dec 2019 05:42:41 -0500 Received: from www262.sakura.ne.jp ([202.181.97.72]:52933 "EHLO www262.sakura.ne.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729018AbfLEKml (ORCPT ); Thu, 5 Dec 2019 05:42:41 -0500 Received: from fsav304.sakura.ne.jp (fsav304.sakura.ne.jp [153.120.85.135]) by www262.sakura.ne.jp (8.15.2/8.15.2) with ESMTP id xB5AfI4B052654; Thu, 5 Dec 2019 19:41:18 +0900 (JST) (envelope-from penguin-kernel@i-love.sakura.ne.jp) Received: from www262.sakura.ne.jp (202.181.97.72) by fsav304.sakura.ne.jp (F-Secure/fsigk_smtp/550/fsav304.sakura.ne.jp); Thu, 05 Dec 2019 19:41:18 +0900 (JST) X-Virus-Status: clean(F-Secure/fsigk_smtp/550/fsav304.sakura.ne.jp) Received: from [192.168.1.9] (softbank126040062084.bbtec.net [126.40.62.84]) (authenticated bits=0) by www262.sakura.ne.jp (8.15.2/8.15.2) with ESMTPSA id xB5AfHTe052651 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NO); Thu, 5 Dec 2019 19:41:18 +0900 (JST) (envelope-from penguin-kernel@i-love.sakura.ne.jp) Subject: Re: KASAN: slab-out-of-bounds Read in fbcon_get_font To: Paolo Bonzini , Dmitry Vyukov Cc: syzbot , Andrey Ryabinin , Bartlomiej Zolnierkiewicz , Daniel Thompson , Daniel Vetter , DRI , ghalat@redhat.com, Gleb Natapov , gwshan@linux.vnet.ibm.com, "H. Peter Anvin" , James Morris , kasan-dev , KVM list , Linux Fbdev development list , LKML , linux-security-module , Maarten Lankhorst , Ingo Molnar , Michael Ellerman , Russell Currey , Sam Ravnborg , "Serge E. Hallyn" , stewart@linux.vnet.ibm.com, syzkaller-bugs , Kentaro Takeda , Thomas Gleixner , the arch/x86 maintainers References: <0000000000003e640e0598e7abc3@google.com> <41c082f5-5d22-d398-3bdd-3f4bf69d7ea3@redhat.com> From: Tetsuo Handa Message-ID: <397ad276-ee2b-3883-9ed4-b5b1a2f8cf67@i-love.sakura.ne.jp> Date: Thu, 5 Dec 2019 19:41:18 +0900 User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.9.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2019/12/05 19:22, Paolo Bonzini wrote: > Ah, and because the machine is a KVM guest, kvm_wait appears in a lot of > backtrace and I get to share syzkaller's joy every time. :) > > This bisect result is bogus, though Tetsuo found the bug anyway. > Perhaps you can exclude commits that only touch architectures other than > x86? > It would be nice if coverage functionality can extract filenames in the source code and supply the list of filenames as arguments for bisect operation. Also, (unrelated but) it would be nice if we can have "make yes2modconfig" target which converts CONFIG_FOO=y to CONFIG_FOO=m if FOO is tristate. syzbot is testing kernel configs close to "make allyesconfig" but I want to save kernel rebuild time by disabling unrelated functionality when manually "debug printk()ing" kernels.