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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id BAE42C02183 for ; Thu, 16 Jan 2025 19:40:44 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 4E8C46B0082; Thu, 16 Jan 2025 14:40:44 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 498D66B0083; Thu, 16 Jan 2025 14:40:44 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 360406B0085; Thu, 16 Jan 2025 14:40:44 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0013.hostedemail.com [216.40.44.13]) by kanga.kvack.org (Postfix) with ESMTP id 18A926B0082 for ; Thu, 16 Jan 2025 14:40:44 -0500 (EST) Received: from smtpin09.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay05.hostedemail.com (Postfix) with ESMTP id 9755D45BC8 for ; Thu, 16 Jan 2025 19:40:43 +0000 (UTC) X-FDA: 83014332366.09.2FDEA4A Received: from nyc.source.kernel.org (nyc.source.kernel.org [147.75.193.91]) by imf15.hostedemail.com (Postfix) with ESMTP id 0C164A0017 for ; Thu, 16 Jan 2025 19:40:41 +0000 (UTC) Authentication-Results: imf15.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=OaC41c+8; spf=pass (imf15.hostedemail.com: domain of kees@kernel.org designates 147.75.193.91 as permitted sender) smtp.mailfrom=kees@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1737056442; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=4Wceyw6sGLsVl7YO+p3ZsxakHdNwx1BFAu7xGdDE/Kg=; b=E2nNXUVaCnrdcP3VXINUfz3yajh+BFR4tqbsh1EFHbpv9DvZam66vu4zGUFi0h/+HO9yq1 UCXwi7umVgkcW2L/zfoIBeaU1JIrFHxHflJRuR6/Gb8V129LQxR05b2YOF+eTAS/r8ADv7 tw2cRMA2qL7/QrupUMaPzQm+da9riO8= ARC-Authentication-Results: i=1; imf15.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=OaC41c+8; spf=pass (imf15.hostedemail.com: domain of kees@kernel.org designates 147.75.193.91 as permitted sender) smtp.mailfrom=kees@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1737056442; a=rsa-sha256; cv=none; b=nxKUPUxBbKFDcU08M7psE7/hAmzPKmlHxe/GMmeeIrWo/qL4xWy4xED+KJXTG56FKkSSJM YRG3JcNfUxaxfiX00SZcgA+huooN13RBFVoj0bT6LZ9OQrUDj2adBlxinyNNN4KOhCa1vd 8tHlyofdpvmxL1ijZ8w2DfNpipVApwE= Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by nyc.source.kernel.org (Postfix) with ESMTP id 26A89A42774; Thu, 16 Jan 2025 19:38:53 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id B1A47C4CED6; Thu, 16 Jan 2025 19:40:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1737056440; bh=okrWJ6ZGx3VQgI670QxFKBYwNPpwrQNlJy8qTomC4nw=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=OaC41c+8yUkHqXDrCDOBYKqZqVz6XU8ziq+umZmvNdijUrym9LLBD1DoilzZWTqGE BOd8imeZQAlMNHPPftkOxT/rrVTfLLAxKSHpMGZMQwFKeu85np97dzws5sM4tK2CJV X2V3zCRPkwoJr27U7uYXxYDiOYS3qK7QINVPtX9cqTNyZERN4Zaf7BpdnWiHUiO2vp tcKPKJ8Mm5mywWzSuMj+oQIcRbCrRB/TBSqKwGWXYW2tRmzVsyAyQ/4gPbR0d5u0c1 a4HTSyxcot2qYbA7dFlJeR2vYi9AnNJSiv0srvwMNZ/Qe4Pvmibn0iGxI3Q4U2H6jp VZz81rlqbYDIg== Date: Thu, 16 Jan 2025 11:40:37 -0800 From: Kees Cook To: Christoph Hellwig Cc: Lorenzo Stoakes , Jeff Xu , akpm@linux-foundation.org, jannh@google.com, torvalds@linux-foundation.org, adhemerval.zanella@linaro.org, oleg@redhat.com, linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org, linux-mm@kvack.org, jorgelo@chromium.org, sroettger@google.com, ojeda@kernel.org, adobriyan@gmail.com, anna-maria@linutronix.de, mark.rutland@arm.com, linus.walleij@linaro.org, Jason@zx2c4.com, deller@gmx.de, rdunlap@infradead.org, davem@davemloft.net, peterx@redhat.com, hca@linux.ibm.com, f.fainelli@gmail.com, gerg@kernel.org, dave.hansen@linux.intel.com, mingo@kernel.org, ardb@kernel.org, Liam.Howlett@oracle.com, mhocko@suse.com, 42.hyeyoo@gmail.com, peterz@infradead.org, ardb@google.com, enh@google.com, rientjes@google.com, groeck@chromium.org, mpe@ellerman.id.au, Vlastimil Babka , Andrei Vagin , Dmitry Safonov <0x7f454c46@gmail.com>, Mike Rapoport , Alexander Mikhalitsyn , Benjamin Berg Subject: Re: [PATCH v4 1/1] exec: seal system mappings Message-ID: <202501161137.D76EE5CEC@keescook> References: <20241125202021.3684919-1-jeffxu@google.com> <20241125202021.3684919-2-jeffxu@google.com> <202412171248.409B10D@keescook> <202501061647.6C8F34CB1A@keescook> <5cf1601b-70c3-45bb-81ef-416d89c415c2@lucifer.local> <202501151538.3E757401@keescook> <20250116052655.GA23894@lst.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250116052655.GA23894@lst.de> X-Rspam-User: X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 0C164A0017 X-Stat-Signature: kpz13w137k5bzwrdbkk4x1uxd1a7ynbm X-HE-Tag: 1737056441-595604 X-HE-Meta: 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 yq/to7wz Q5AZ8Btk4BhYeiSAm0ZDkhk17MQH013vUxVFP26yTxLK0zySyOWAqSE67nl6/A/OD7rRzsmUfwDYDDpZawhr9DWpldzbxvAnZDXkOY+RXAcuXYpaaDpM0N2Uh0DydZgvcmaS5X0QaMDup/D2VQNh5Wn0Dov8br0RLiFyoHjLwWIJwg8soPzHjRSesqu0l3F5QEZuWzJLoB3xeEBW/NM8UxB1pGIcjOGUOYEaE7yC97XpyYxvXXKtN3iAnbHAY5c+vX639Le6pIbq18voz7jF39hvmE603ocj17WsCQ6iiGkhnghRZumLc+55HBLY6lUFh21CxilRn2tbJJbemTbMFZtDCOfcfRsbvJOk4 X-Bogosity: Ham, tests=bogofilter, spamicity=0.001989, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu, Jan 16, 2025 at 06:26:55AM +0100, Christoph Hellwig wrote: > On Wed, Jan 15, 2025 at 03:52:23PM -0800, Kees Cook wrote: > > > You seem to be saying you're pushing an internal feature on upstream and > > > only care about internal use cases, this is not how upstream works, as > > > Matthew alludes to. > > > > Internal? No. Chrome OS and Android. Linux runs more Android devices > > than everything else in the world combined -- this is not some random > > experiment. > > All of which are tightly controlled by Google and not actually open > to users. Which doesn't say they don't matter, but they matter a > lot less than fetures widely useful to the open not locked down > userbase of classic Linux. I get your point. Though in my proposal it would be available to anyone without CRIU too, which is, for example, defconfig builds (excepting s390 and riscv). -- Kees Cook