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=-2.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, 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 04B19C2D0D1 for ; Tue, 17 Dec 2019 05:12:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CE6542072D for ; Tue, 17 Dec 2019 05:12:41 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="Fl0v2lo2" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727707AbfLQFMk (ORCPT ); Tue, 17 Dec 2019 00:12:40 -0500 Received: from mail-pl1-f194.google.com ([209.85.214.194]:41288 "EHLO mail-pl1-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726920AbfLQFMh (ORCPT ); Tue, 17 Dec 2019 00:12:37 -0500 Received: by mail-pl1-f194.google.com with SMTP id bd4so5522002plb.8 for ; Mon, 16 Dec 2019 21:12:37 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=q8uq0G/0a7n6wpCfthraliInM8bWXiLfDNBWtuDMtJ8=; b=Fl0v2lo28eToo5OfamdynpU3VUKelWk576MTDeGbgaSOPoSF2oP2NxvPiIVhkqlZOr BpXQcvAl9FcaDO0W3hxow/LxKBn42CFXGVcqL0CpCkE2B97xXAn5IdEF0c/1u1tLoj1K 8UXxO1U3y6FSZTdkb/w2FvSSqRrKmDH5oXOHifjDJMzTwvZC4Nv4s1fj4kwc4p6PaGlL ig2WtwUSRnJeYgM/FkBfxu7095yTFvrIeCWV3wTci61MDNOdSl+Blv1oY0FZphxNk8TL vkHCEAiG4dHcY5/QVvlaSAIaFCAbO5ryV3f2FmrcV9LsfALEZsq7Nhp7hruvOO9U3DQs tJHA== 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:message-id:references :mime-version:content-disposition:in-reply-to:user-agent; bh=q8uq0G/0a7n6wpCfthraliInM8bWXiLfDNBWtuDMtJ8=; b=JzR25eGcpaaggpGffcLtaqauc7KT5ZtBlNvxx5xkzjZA6LpozFgaoj8FpbOD8dwb98 5NJsPTwTZ9T6v0DCbBBdvqVo/DZKC6w0S0HwBUR2SKyyNek+AtNnXUnU1qCUuU6SHd9G yYdyup2tzgBc1XyUIypD1KNuPjtB5VuzlBBenZXqP1Ns/FgZa+224GdK0LdqM0RqYkij s1evllzLP8UpmulclzBNSY4ZYJXByYSC+YyFV06FqnaK6mHHwuFBhMYFglm+rJKwbx9q ZR7sdNgpkkzmPcsqr09BzagQAb52PkPiPK6scv7334z1dWExj5KSK/93aEIAERjDXVvF u4Mg== X-Gm-Message-State: APjAAAXNvOe6Kt2aMwAbJLPHb7a63paJGaNQZslKnN1xGw9UT3FMEpWD FCuBDnzLgYAfbhgurKZ3e9c= X-Google-Smtp-Source: APXvYqy3lSJKhLaFlrkVPcy3/Kqv3W5CFnC949J5w5xHpyX1wYGi6RcSMBAP13o4qK5uFE3FiiAr0w== X-Received: by 2002:a17:902:b083:: with SMTP id p3mr20066966plr.141.1576559557194; Mon, 16 Dec 2019 21:12:37 -0800 (PST) Received: from localhost ([2401:fa00:8f:203:250d:e71d:5a0a:9afe]) by smtp.gmail.com with ESMTPSA id 16sm24569625pfh.182.2019.12.16.21.12.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 16 Dec 2019 21:12:36 -0800 (PST) Date: Tue, 17 Dec 2019 14:12:34 +0900 From: Sergey Senozhatsky To: Tetsuo Handa Cc: Alexander Viro , Petr Mladek , Sergey Senozhatsky , Arnd Bergmann , Greg Kroah-Hartman , Jiri Slaby , Steven Rostedt , Linus Torvalds , linux-kernel@vger.kernel.org, Dmitry Vyukov Subject: Re: [PATCH] kconfig: Add kernel config option for fuzz testing. Message-ID: <20191217051234.GA54407@google.com> References: <20191216095955.9886-1-penguin-kernel@I-love.SAKURA.ne.jp> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20191216095955.9886-1-penguin-kernel@I-love.SAKURA.ne.jp> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On (19/12/16 18:59), Tetsuo Handa wrote: [..] > +++ b/kernel/printk/printk.c > @@ -1198,6 +1198,14 @@ MODULE_PARM_DESC(ignore_loglevel, > > static bool suppress_message_printing(int level) > { > +#ifdef CONFIG_KERNEL_BUILT_FOR_FUZZ_TESTING > + /* > + * Changing console_loglevel causes "no output". But ignoring > + * console_loglevel is easier than preventing change of > + * console_loglevel. > + */ > + return (level >= CONSOLE_LOGLEVEL_DEFAULT && !ignore_loglevel); > +#endif > return (level >= console_loglevel && !ignore_loglevel); > } Can you fuzz test with `ignore_loglevel'? -ss