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=-4.3 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS 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 EB246C433E1 for ; Sun, 26 Jul 2020 07:13:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BC44620658 for ; Sun, 26 Jul 2020 07:13:56 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="u5BNgTee" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725903AbgGZHN4 (ORCPT ); Sun, 26 Jul 2020 03:13:56 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59796 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725829AbgGZHN4 (ORCPT ); Sun, 26 Jul 2020 03:13:56 -0400 Received: from mail-pl1-x62c.google.com (mail-pl1-x62c.google.com [IPv6:2607:f8b0:4864:20::62c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 00CFEC0619D2 for ; Sun, 26 Jul 2020 00:13:54 -0700 (PDT) Received: by mail-pl1-x62c.google.com with SMTP id 72so6544806ple.0 for ; Sun, 26 Jul 2020 00:13:54 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:to:references:cc:from:message-id:date:user-agent :mime-version:in-reply-to:content-transfer-encoding; bh=JV8zNCXQOwj+3pWcxut1Sa+hpHp4pEqdHLGsxwF/xr4=; b=u5BNgTeeVxpQvyaV2d/IvpkYmAkPD8kqvGSBlvh0mB5207slvZMA9CUrmU+PMqmwRI CTrRzv6BxKwvjhS6pshx9U8OJVWOJy8RIVVuojkzwKFLMTYFWKxDLdIMSPS61qf50zNC HfR+7J9R+nTGtu1Mora45R+BG+v/QLeeVA9JYiznKpJ8PhnqtTq4Aq8+G4LRTvTfke7n M3yDF697H802vbjio4nh2WVUrvN99Y5Lc/frlqyt25RQFbC5pHqiXMLHlu9PHK5CcpO6 1uoFBUdqMZtkNJrwmws7qWcsv96BuH+OoT1rjXCPEKRgzBXmYJZ8BSKFNxp+lPSFWLRS dGSw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:references:cc:from:message-id:date :user-agent:mime-version:in-reply-to:content-transfer-encoding; bh=JV8zNCXQOwj+3pWcxut1Sa+hpHp4pEqdHLGsxwF/xr4=; b=UoikZJ5HXn5nHHmt1MImw/gA/wbTF7gl7dnxu9gLtiH/VHhk539dyM9imuc4qfXXxp uSgpmlvCwC1kwZFYz4UKS4/mLv1aIF8ftkghe4lv1ArIjY2YQz9NgkU/EuFQM7Mpc//6 MGolkGKKnYmoE22DSjDr3D1V+htcuRzv2XBJBP3Gu4xgvmpdaX60BE6lCtdGNgFz0CR+ mPNFYuIXLqHMDbiwp5r+q1GqGl6zT+teOWN7I/LU2a5E065cdp2lsR2Ah+yQQXr1DJyO UOZPsHTOwi/G6l2kuck6mWwtgngiV/ILsVRYBBia37QBzPAJg0qah7Xeuetmy1onCAgy EqeQ== X-Gm-Message-State: AOAM533QISKBLJRM1O1gEAMaFrKN49N0fE8l2aglPxxbXJ12yOaALaUC ccICLB9MC9pFsWKvkIBSC6o= X-Google-Smtp-Source: ABdhPJyine0fJGPuYXnktF9ZEeJQ2P64YmnD8GiFMPx0WZ0bQsQOFsTeEI02UcoEOtIySztTkxN7Jw== X-Received: by 2002:a17:90a:7483:: with SMTP id p3mr13046500pjk.64.1595747634264; Sun, 26 Jul 2020 00:13:54 -0700 (PDT) Received: from [192.168.1.101] (122-58-181-132-adsl.sparkbb.co.nz. [122.58.181.132]) by smtp.gmail.com with ESMTPSA id m66sm989208pfd.90.2020.07.26.00.13.51 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Sun, 26 Jul 2020 00:13:53 -0700 (PDT) Subject: Re: Seccomp support for linux-m68k To: John Paul Adrian Glaubitz , linux-m68k References: <5642df4a-be8f-01eb-63c1-b5b4d75fa9d0@physik.fu-berlin.de> <06f3ccd0-3567-5905-eea0-80fb18206648@gmail.com> Cc: Debian m68k , Helge Deller From: Michael Schmitz Message-ID: Date: Sun, 26 Jul 2020 19:13:49 +1200 User-Agent: Mozilla/5.0 (X11; Linux ppc; rv:45.0) Gecko/20100101 Icedove/45.4.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-m68k-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-m68k@vger.kernel.org Am 26.07.2020 um 13:34 schrieb Michael Schmitz: > Andreas: could we preset -EPERM as return code on entering > do_trace_entry to save another jump, possibly even without setting > -ENOSYS before attempting the syscall, or would that break the syscall ABI? Never mind - -ENOSYS is needed for strace only, not the syscall proper so a slightly simpler version saving one jump is possible. I'll send a final version for Geert to consider if your tests show this actually works as intended. Cheers, Michael