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=-5.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=unavailable 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 959AAC2BB1D for ; Wed, 11 Mar 2020 17:50:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 249C220737 for ; Wed, 11 Mar 2020 17:50:53 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="UILrWcCt" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730615AbgCKRuv (ORCPT ); Wed, 11 Mar 2020 13:50:51 -0400 Received: from mail-pl1-f194.google.com ([209.85.214.194]:38596 "EHLO mail-pl1-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730363AbgCKRuv (ORCPT ); Wed, 11 Mar 2020 13:50:51 -0400 Received: by mail-pl1-f194.google.com with SMTP id w3so1436990plz.5 for ; Wed, 11 Mar 2020 10:50:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=7sBNUBd/uoLqeWm3BCjD6JnY8y62ha07uYYhCFjOniA=; b=UILrWcCt+jJLJUObxfK2PFzMp/dMmJGV4+2NQ7xTj16PjSTEdTlS56BE4ru99N2qtU CM1pSNk6dXLjcx2xS3j/bYT8cjAGzTFuXWJl1oVGmDXY+12OYUsUdrYojJyqzceetHQO UTKe47vBrGbsW9Lek1fuubAptu1/VHwv8GVRw= 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; bh=7sBNUBd/uoLqeWm3BCjD6JnY8y62ha07uYYhCFjOniA=; b=UFnPsHqj/V2qyWA6boPgSxe+PX92hHbqHus25aTl2jy2ERCTiYtdOiEya0PYQ6hEyE Z8kGz5pn37e3hWy/WXUPNBQs1DKrm7C8Qf6qr7UNRWs1TWu53gui0X/qp7ItRAhwGoZb 56dS3llQAdJoWdq7wgjGWLbo8acQp6p6ghs1/MoGqKj6Y18XqXvxOUa2VOLhdVYcj/pz cB/RUN/Kf8elwB6oQHO5YllSPZShT58B77u90aNAxLWSDdo6U3BafIFp44ICuW3vZ9GZ Q3BmTR7/bnkVhlFoIILwIfFbAuldLB9SMMI1ek2Xi9kBCibGdaKWqPkOjuQT0rt9jNUm WOMA== X-Gm-Message-State: ANhLgQ3qRZ6G0zcInBVo8+y8xmpPZcjomsMV1ZpdCJrgDy/MdDlZ0cyp jguJ9sU1MEVoaFXsYYc+wmK40A== X-Google-Smtp-Source: ADFU+vt/BpnZQvSz+Mve380v5k0wH5olyZUjOt2Mxb6oT1WmMXFk4KZPEIrrPJhKS5kRSe9me30HWA== X-Received: by 2002:a17:90b:3609:: with SMTP id ml9mr4504755pjb.146.1583949050121; Wed, 11 Mar 2020 10:50:50 -0700 (PDT) Received: from www.outflux.net (smtp.outflux.net. [198.145.64.163]) by smtp.gmail.com with ESMTPSA id b25sm1250829pfp.201.2020.03.11.10.50.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 11 Mar 2020 10:50:49 -0700 (PDT) Date: Wed, 11 Mar 2020 10:50:48 -0700 From: Kees Cook To: Eric Biggers Cc: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, stable@vger.kernel.org, Alexei Starovoitov , Andrew Morton , Greg Kroah-Hartman , Jeff Vander Stoep , Jessica Yu , Luis Chamberlain Subject: Re: [PATCH] kmod: make request_module() return an error when autoloading is disabled Message-ID: <202003111050.B5D4423DA@keescook> References: <20200310223731.126894-1-ebiggers@kernel.org> <202003111026.2BBE41C@keescook> <20200311174134.GB20006@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200311174134.GB20006@gmail.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Mar 11, 2020 at 10:41:34AM -0700, Eric Biggers wrote: > On Wed, Mar 11, 2020 at 10:28:07AM -0700, Kees Cook wrote: > > On Tue, Mar 10, 2020 at 03:37:31PM -0700, Eric Biggers wrote: > > > From: Eric Biggers > > > > > > It's long been possible to disable kernel module autoloading completely > > > by setting /proc/sys/kernel/modprobe to the empty string. This can be > > > > Hunh. I've never seen that before. :) I've always used; > > > > echo 1 > /proc/sys/kernel/modules_disabled > > > > Regardless, > > > > Reviewed-by: Kees Cook > > > > modules_disabled is different because it disables *all* module loading, not just > autoloading. Yes, quite true. Some day I'd love to revisit this series to improve autoloading sanity checking: https://github.com/KSPP/linux/issues/24 -- Kees Cook