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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4EFAFCD98EA for ; Wed, 11 Oct 2023 15:59:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1346948AbjJKP7V (ORCPT ); Wed, 11 Oct 2023 11:59:21 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53232 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232812AbjJKP7Q (ORCPT ); Wed, 11 Oct 2023 11:59:16 -0400 Received: from mail-pl1-x634.google.com (mail-pl1-x634.google.com [IPv6:2607:f8b0:4864:20::634]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6F249A7 for ; Wed, 11 Oct 2023 08:59:15 -0700 (PDT) Received: by mail-pl1-x634.google.com with SMTP id d9443c01a7336-1c60778a3bfso59291775ad.1 for ; Wed, 11 Oct 2023 08:59:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; t=1697039955; x=1697644755; darn=vger.kernel.org; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:from:to:cc:subject:date:message-id:reply-to; bh=4EBM6QELn8ef1132SlMYb+b5mnbgclrgGpye79FUDoA=; b=kOdm9yp70z5nFVU+0weI+1eg23cIaj25FheAboD6zB4zEnLNzmjeqLn9MjCX/uc7v0 C4/BKUtrAVht43EvwZkJQlK7bkNv49u2D9En5mm7ez9Bc55zKqCdToKmdE8T3Lw6rRpc IHTxWGl5ZiImOeL93KfhJVcgwO8RBsSsUtx1I= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1697039955; x=1697644755; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=4EBM6QELn8ef1132SlMYb+b5mnbgclrgGpye79FUDoA=; b=KjIw0Wv7ErSIrPPsryUF1m7Kxpz+w2vetOLavGjX1VKlXKDq2hItQNkGrBC97Jk3kE 9/rXiGPkgZOm/w9naJDe+OSvaQqywDd5lUj0KW5GjA0xALOPnAV1DzOL6oIOEK5iVXSC X1Hr441Md37MGq9bPs2ktOZLYmX49a8lKJl2d/KlgOYBxHkmwvySS6V4EEPz5JVHgk6L 8eOwveSmqWcxH05c8kbhZBItImxe7hD0OF7vp9zXh9RUGqLGpueprO1occYChRA/irtp vm22OBnaUiBgDhz7MO/woQS5tV/3OR+qtfK8uoLlcJk4OxtZA/XI37SjIFxaoSbzJhzW P9Og== X-Gm-Message-State: AOJu0YyXWSzkxCNZ4Vi2pu2cmSvHZMdW+BM22BxSU51pnw3L08qzF0wB o/CTbyAddnTo4SCM6gBqm6wbfg== X-Google-Smtp-Source: AGHT+IFnhzRKmMknQABhdyRSLqQ/OlvokCEslWYllvOvh9DztjV2jkf9w6Z8A6ji3ZgSPg2SoS9dEQ== X-Received: by 2002:a17:902:d716:b0:1c7:37e2:13e5 with SMTP id w22-20020a170902d71600b001c737e213e5mr18437786ply.21.1697039954910; Wed, 11 Oct 2023 08:59:14 -0700 (PDT) Received: from www.outflux.net (198-0-35-241-static.hfc.comcastbusiness.net. [198.0.35.241]) by smtp.gmail.com with ESMTPSA id u7-20020a170902b28700b001c46d04d001sm9681plr.87.2023.10.11.08.59.13 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 11 Oct 2023 08:59:14 -0700 (PDT) Date: Wed, 11 Oct 2023 08:59:12 -0700 From: Kees Cook To: Alyssa Ross Cc: Alexander Viro , Christian Brauner , Tetsuo Handa , Eric Biederman , linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] exec: allow executing block devices Message-ID: <202310110857.522FAFCA@keescook> References: <20231010092133.4093612-1-hi@alyssa.is> <202310101535.CEDA4DB84@keescook> <87o7h5vcao.fsf@alyssa.is> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <87o7h5vcao.fsf@alyssa.is> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Oct 11, 2023 at 07:38:39AM +0000, Alyssa Ross wrote: > Is it possible to have a file-backed memfd? Strange name if so! Not that I'm aware, but a program could just read the ELF from the block device and stick it in a memfd and execute the result. -- Kees Cook