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=-6.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,NICE_REPLY_A, 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 F331FC433DF for ; Fri, 31 Jul 2020 04:56:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C28DF2074B for ; Fri, 31 Jul 2020 04:56:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1596171379; bh=AC63P4IWBeE5EROTpGwALPeMLOjLL+r2lsJMJNyApEs=; h=Subject:To:Cc:References:From:Date:In-Reply-To:List-ID:From; b=IwglX2jxzfB4po9ZiNG0yRcxjVWbKsob3WcI0JeOFE467P97L5O4qknEcjfappKuk xPKP9oZWdfExWUTIbfNK4JGbOQdSqqbMB83fw3JkjykaJUwMGarfkOHwIMnFtLQ+0N rN53le4Gd1Kw8GiQEO5mlacWEq0kudkavmF4th2s= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730157AbgGaE4T (ORCPT ); Fri, 31 Jul 2020 00:56:19 -0400 Received: from mail-ed1-f67.google.com ([209.85.208.67]:35892 "EHLO mail-ed1-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726276AbgGaE4S (ORCPT ); Fri, 31 Jul 2020 00:56:18 -0400 Received: by mail-ed1-f67.google.com with SMTP id c15so11839958edj.3; Thu, 30 Jul 2020 21:56:17 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=4H+oRSmTvEm6CIUgIK4P0aR3vjANz1UROQflSVQivnc=; b=b/m9SZFU0Lkek9YdHHL6wkC5R/nhiQftFO33jVk6TY2GsBZ1NCDNzFrPzX+D5iQ3/p PTBXHVzJnxCDL7hJxaN/wHiaiq2gNnTEXUbA0BAGxwhCh1yGqACWb3GNKTohUWL5ovg2 xOSfDTJFhJsyJaYdaWXaCk47T4I1BXcEeie9AlPk/YlwRWQt99TvhD3gVEUtqoKEuRKs pHT6VdrDqlM3q88oong0Y/nRjDS5SIfq98zHurEN059oaAvZYwdUbXY98+f2Fp/wtoQC VObsmAfyhizTcSQh+AQk7/GHw2Zw8NEkJDCm8CX6LfgBeyB6a51ZouNfu+BX99+i8BYE gtPg== X-Gm-Message-State: AOAM530nvv2LNDglg03SmTik0lA78z5wz8VlmF1bn+OCw7CXF3yS+K2n QSPyjt0keV/k1yHWCPUiTpU= X-Google-Smtp-Source: ABdhPJyEGl1t8oZSMXGGJywcFvB6YfHnbZsZ2I+VAQnNpB4AzoQ2ukdWZucjy94em1xriCvhfy3x4A== X-Received: by 2002:a05:6402:3110:: with SMTP id dc16mr2202194edb.218.1596171377036; Thu, 30 Jul 2020 21:56:17 -0700 (PDT) Received: from ?IPv6:2a0b:e7c0:0:107::49? ([2a0b:e7c0:0:107::49]) by smtp.gmail.com with ESMTPSA id c7sm8096414ejr.77.2020.07.30.21.56.15 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 30 Jul 2020 21:56:16 -0700 (PDT) Subject: Re: [PATCH] vgacon: Fix an out-of-bounds in vgacon_scrollback_update() To: Yang Yingliang , b.zolnierkie@samsung.com Cc: dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org, =?UTF-8?B?5byg5LqR5rW3?= References: <20200713105730.550334-1-yangyingliang@huawei.com> <220220f1-48f7-46f6-952f-ab41fa57d6a1@kernel.org> <9aecd7ac-5060-6b8d-61f8-393431eb243f@kernel.org> <3df26fed-5ade-df26-6417-380401b9650b@huawei.com> From: Jiri Slaby Message-ID: <42bd14e3-ae2f-0c14-5d42-e3e7aeb11c78@kernel.org> Date: Fri, 31 Jul 2020 06:56:14 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <3df26fed-5ade-df26-6417-380401b9650b@huawei.com> Content-Type: text/plain; charset=iso-8859-2 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 Hi, On 31. 07. 20, 5:23, Yang Yingliang wrote: > void execute_one(void) > { > intptr_t res = 0; > res = syz_open_dev(0xc, 4, 1); open(/dev/tty1) > if (res != -1) > r[0] = res; > *(uint16_t*)0x20000000 = 0xc; > *(uint16_t*)0x20000002 = 0x373; > *(uint16_t*)0x20000004 = 0x1442; > syscall(__NR_ioctl, r[0], 0x5609ul, 0x20000000ul); VT_RESIZE(12, 883) > memcpy((void*)0x20003500, "\x7f\x45\x4c\x46\x00\x00\x00... > syscall(__NR_write, r[0], 0x20003500ul, 0x381ul); Write 381 bytes of some ELF to the tty. OK, that's it. Thanks. -- js