Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752824AbbG1Pcj (ORCPT ); Tue, 28 Jul 2015 11:32:39 -0400 Received: from mail-vn0-f50.google.com ([209.85.216.50]:36819 "EHLO mail-vn0-f50.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752513AbbG1Pcf (ORCPT ); Tue, 28 Jul 2015 11:32:35 -0400 MIME-Version: 1.0 In-Reply-To: References: <1438070731-17764-1-git-send-email-drysdale@google.com> From: David Drysdale Date: Tue, 28 Jul 2015 16:32:14 +0100 Message-ID: Subject: Re: [PATCH RFC 0/1] UAPI,x86: export syscall numbers for all x86 archs To: Paul Moore Cc: X86 ML , Thomas Gleixner , Ingo Molnar , Andy Lutomirski , "H. Peter Anvin" , Michael Kerrisk , Kees Cook , Eric Paris , Linux API , "linux-kernel@vger.kernel.org" Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1555 Lines: 38 On Tue, Jul 28, 2015 at 1:20 PM, Paul Moore wrote: > On Tue, Jul 28, 2015 at 4:05 AM, David Drysdale wrote: >> A while ago I was trying to build a seccomp-bpf filter program that would >> survive a change of x86 architecture. This was complicated for all sorts of >> reasons, but one of the problems was that the different syscall numbers aren't >> all available at the same time -- hence this patch. > > Or just use libseccomp and let it take care of all the different ABI > specific warts for you. The library handles the undefined syscalls > you describe, but also multiplexed syscalls (e.g. socket related > syscalls on x86) and proper invalid arch/ABI filtering Ah, I hadn't realized that libseccomp handled cross-architecture stuff and the socketcall multiplexing -- very neat. I'll look into whether I can convert my stuff to use it. I still think exporting all the sub-arch syscall numbers is a good idea though (even if my need for it is potentially reduced by libseccomp)... > (you are > filtering x32 correctly on x86-64 right?). Yep, I think so, but it's fiddly. If I can leave the fiddliness to libseccomp, so much the better... Thanks for the pointer, David > * https://github.com/seccomp/libseccomp > > -- > paul moore > www.paul-moore.com -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/