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=-2.4 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,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 C3999C76188 for ; Fri, 19 Jul 2019 10:29:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 972E221849 for ; Fri, 19 Jul 2019 10:29:51 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=brauner.io header.i=@brauner.io header.b="JAjsDhcT" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727640AbfGSK3v (ORCPT ); Fri, 19 Jul 2019 06:29:51 -0400 Received: from mail-wm1-f66.google.com ([209.85.128.66]:50486 "EHLO mail-wm1-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727189AbfGSK3v (ORCPT ); Fri, 19 Jul 2019 06:29:51 -0400 Received: by mail-wm1-f66.google.com with SMTP id v15so28317373wml.0 for ; Fri, 19 Jul 2019 03:29:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=brauner.io; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=/54Z+i2NAAKKYqTyaHCknB2yONX433P+mrrcxDIdMKQ=; b=JAjsDhcTKFikvYch2sdYf3M1YIU4lD8gtr6ULD+m66RVXVuqlNpAWJ5aCmwhzsJqfu NYMs/ngfnZnIR8qK+5gnlfw/LTN1DoKaojW4kG3ixmkDG7tw9PX3Gi1H6Z3rJyqaYFRY gtdhUxjOR3aQahCtFDINrBG/OSP8pnsgZFupRZsDuzUdLCVJo0FcPvznY5c5cU461qY8 z6fVQ/+Mbzs3h37QWljm/AYaqqO87pyj8pyd6RorqrMiW7iIeyvakf6A7A7GAM2bH4rw cbSgv5bCTz5aSE0toZ8ZOUCkVQ0c1BjSzCzQ1F1IbaB+eNv/4FBgS3Np35nlQBPDWp48 Qe+g== 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=/54Z+i2NAAKKYqTyaHCknB2yONX433P+mrrcxDIdMKQ=; b=Vq/ovw5zd8k6Z/pqzmFRBB033hnWerj2p90APJfvi8tMC3QDx4Y+SPBWV0MZTwsMww saarlaYqqhI9S6cy4/HlmrH8imM0xwS6Nseqi39OauWIaLFExHU9nr5Wih9g2j1HDAT4 cGfGkSBW+3BQR0cYrxZNOkusgS38PH7eAwW8o9TbN3OOoa5S8HxOFZ6GKS8iAQ2Y67c1 2uBPlGklbrYTn0C8wHcER0+X0FM/1xBdSKkSRPWKegHbWQ0JkpBP4402JmxL/6eep0jI 84xZ/rB5mN+fWcNcUAHGNg6RpGONBLo+3cQiqox60qebQgqSzTCQ7MfiZYX6siiaaeK6 gkNA== X-Gm-Message-State: APjAAAU+w+SF2/5tOApR3YDkzEMpavSUKBeyBu8Z3OHekTMUu6E+8K9A D9UTw2Z2Z8kTNp6r2iIMPFc= X-Google-Smtp-Source: APXvYqynzSxRaiMvY03x+MCUOq/ut+wmSYg6CTggvreuOHjcm6imyyhYbJGXSWZ87v9KsAJECqBb6Q== X-Received: by 2002:a1c:c145:: with SMTP id r66mr47654238wmf.139.1563532189209; Fri, 19 Jul 2019 03:29:49 -0700 (PDT) Received: from brauner.io ([81.92.17.140]) by smtp.gmail.com with ESMTPSA id v4sm25167633wmg.22.2019.07.19.03.29.47 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Fri, 19 Jul 2019 03:29:49 -0700 (PDT) Date: Fri, 19 Jul 2019 12:29:41 +0200 From: Christian Brauner To: "Dmitry V. Levin" Cc: Arnd Bergmann , Aleksa Sarai , Al Viro , Jeff Layton , "J. Bruce Fields" , David Howells , Shuah Khan , Shuah Khan , Eric Biederman , Andy Lutomirski , Andrew Morton , Alexei Starovoitov , Kees Cook , Jann Horn , Tycho Andersen , David Drysdale , Chanho Min , Oleg Nesterov , Aleksa Sarai , Linus Torvalds , containers@lists.linux-foundation.org, alpha , Linux API , linux-arch , Linux ARM , Linux FS-devel Mailing List , linux-ia64@vger.kernel.org, Linux Kernel Mailing List , "open list:KERNEL SELFTEST FRAMEWORK" , linux-m68k , linux-mips@vger.kernel.org, Parisc List , linuxppc-dev , linux-s390 , Linux-sh list , linux-xtensa@linux-xtensa.org, sparclinux Subject: Re: [PATCH v9 08/10] open: openat2(2) syscall Message-ID: <20190719102932.274pvmxnrbjcc6gu@brauner.io> References: <20190706145737.5299-1-cyphar@cyphar.com> <20190706145737.5299-9-cyphar@cyphar.com> <20190718161231.xcno272nvqpln3wj@yavin> <20190719021218.GB18022@altlinux.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20190719021218.GB18022@altlinux.org> User-Agent: NeoMutt/20180716 Sender: linux-parisc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-parisc@vger.kernel.org On Fri, Jul 19, 2019 at 05:12:18AM +0300, Dmitry V. Levin wrote: > On Thu, Jul 18, 2019 at 11:29:50PM +0200, Arnd Bergmann wrote: > [...] > > 5. you get the same problem with seccomp and strace that > > clone3() has -- these and others only track the register > > arguments by default. > > Just for the record, this is definitely not the case for strace: > it decodes arrays, structures, netlink messages, and so on by default. There sure is value in trying to design syscalls that can be handled nicely by seccomp but that shouldn't become a burden on designing extensible syscalls. I suggested a session for Ksummit where we can discuss if and how we can make seccomp more compatible with pointer-args in syscalls. Christian