From mboxrd@z Thu Jan 1 00:00:00 1970 From: "H. Peter Anvin" Subject: Re: [PATCH v8 3/8] seccomp: add system call filtering using BPF Date: Thu, 16 Feb 2012 16:43:40 -0800 Message-ID: <4F3DA2BC.7010706@zytor.com> References: <1329422549-16407-1-git-send-email-wad@chromium.org> <1329422549-16407-3-git-send-email-wad@chromium.org> <4F3D61CB.2000301@zytor.com> <4F3D7250.6040504@zytor.com> <4F3D766E.7040205@zytor.com> <4F3D7DD4.6070103@zytor.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Sender: linux-doc-owner@vger.kernel.org To: Will Drewry Cc: Markus Gutschke , linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, linux-doc@vger.kernel.org, kernel-hardening@lists.openwall.com, netdev@vger.kernel.org, x86@kernel.org, arnd@arndb.de, davem@davemloft.net, mingo@redhat.com, oleg@redhat.com, peterz@infradead.org, rdunlap@xenotime.net, mcgrathr@chromium.org, tglx@linutronix.de, luto@mit.edu, eparis@redhat.com, serge.hallyn@canonical.com, djm@mindrot.org, scarybeasts@gmail.com, indan@nul.nu, pmoore@redhat.com, akpm@linux-foundation.org, corbet@lwn.net, eric.dumazet@gmail.com, keescook@chromium.org List-Id: linux-arch.vger.kernel.org On 02/16/2012 03:00 PM, Will Drewry wrote: > > Without the addition of x32, it is still the intersection of > is_compat_task()/TS_COMPAT and CONFIG_64BIT for all arches to > determine if the call is 32-bit or 64-bit, but this will add another > wrinkle. Would it make sense to assume that system call namespaces > may be ever expanding and offer up an unsigned integer value? > This is definitely the most general solution. By the way, although most processes only use one set of system calls, there are legitimate reasons for cross-mode tasks, and those probably have a high overlap with the ones that would benefit from this kind of filtering facility, e.g. pin. -hpa From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from terminus.zytor.com ([198.137.202.10]:35881 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752902Ab2BQAog (ORCPT ); Thu, 16 Feb 2012 19:44:36 -0500 Message-ID: <4F3DA2BC.7010706@zytor.com> Date: Thu, 16 Feb 2012 16:43:40 -0800 From: "H. Peter Anvin" MIME-Version: 1.0 Subject: Re: [PATCH v8 3/8] seccomp: add system call filtering using BPF References: <1329422549-16407-1-git-send-email-wad@chromium.org> <1329422549-16407-3-git-send-email-wad@chromium.org> <4F3D61CB.2000301@zytor.com> <4F3D7250.6040504@zytor.com> <4F3D766E.7040205@zytor.com> <4F3D7DD4.6070103@zytor.com> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-arch-owner@vger.kernel.org List-ID: To: Will Drewry Cc: Markus Gutschke , linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, linux-doc@vger.kernel.org, kernel-hardening@lists.openwall.com, netdev@vger.kernel.org, x86@kernel.org, arnd@arndb.de, davem@davemloft.net, mingo@redhat.com, oleg@redhat.com, peterz@infradead.org, rdunlap@xenotime.net, mcgrathr@chromium.org, tglx@linutronix.de, luto@mit.edu, eparis@redhat.com, serge.hallyn@canonical.com, djm@mindrot.org, scarybeasts@gmail.com, indan@nul.nu, pmoore@redhat.com, akpm@linux-foundation.org, corbet@lwn.net, eric.dumazet@gmail.com, keescook@chromium.org Message-ID: <20120217004340.IxDViK2984ksIfyHDT-LgS39A8yf7w32UbXAa6nwyeQ@z> On 02/16/2012 03:00 PM, Will Drewry wrote: > > Without the addition of x32, it is still the intersection of > is_compat_task()/TS_COMPAT and CONFIG_64BIT for all arches to > determine if the call is 32-bit or 64-bit, but this will add another > wrinkle. Would it make sense to assume that system call namespaces > may be ever expanding and offer up an unsigned integer value? > This is definitely the most general solution. By the way, although most processes only use one set of system calls, there are legitimate reasons for cross-mode tasks, and those probably have a high overlap with the ones that would benefit from this kind of filtering facility, e.g. pin. -hpa