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=-5.1 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,URIBL_BLOCKED,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 DE0DEC388F9 for ; Mon, 9 Nov 2020 01:22:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8E3CF20678 for ; Mon, 9 Nov 2020 01:22:58 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="vZ6ks+2x" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728991AbgKIBW5 (ORCPT ); Sun, 8 Nov 2020 20:22:57 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53662 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727979AbgKIBW5 (ORCPT ); Sun, 8 Nov 2020 20:22:57 -0500 Received: from mail-wm1-x342.google.com (mail-wm1-x342.google.com [IPv6:2a00:1450:4864:20::342]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id ABEE1C0613CF for ; Sun, 8 Nov 2020 17:22:56 -0800 (PST) Received: by mail-wm1-x342.google.com with SMTP id w24so3993123wmi.0 for ; Sun, 08 Nov 2020 17:22:56 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=zL1+G1iCtCAQiwcai2Rra7oPinx86zF4HN9ctuWZLWU=; b=vZ6ks+2xpg4RjXFG2VeAW7Z0xyUsrT4AgpI7V2Fm5e0HQHh8uOZnTF7a0VL5z7q4pt Ue3i+brw65rQZn/Y9kozEJLyxE8szFdbZjQuCbnqAxJ2BEsiSJe9Scpta62Iwhl6miG/ rMOSbhvvGDTSaJfFLSfaAqG9TkRS4MbuLAzxtTxTf5IgjrkmHaeVBCN8q2CWir5POxDK Fc0lhiaQEhr5Yb9VTVM6uDFMq6uUlYCEZtFLdy3dc+eCa24VrDzuS0nLEExiskVkGnTP IqK0li9VmzyPJRwzCEoYnu5QYtdwa+BXv7fGE7jdKi9E6S2265EFqhnD7WGJUbC1q3Cu smPQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=zL1+G1iCtCAQiwcai2Rra7oPinx86zF4HN9ctuWZLWU=; b=Ouha8LBFsI3qzPecPRmNOeBv74aQNipbzOI+ppcSCh3jM84++wCB3mLMyFc95nawIS neXa+0byWvSQhiX6okeZRPgu7/UbzPrS3L+cywFK01vYUs04fW26Wv1vh7bEcvT1EiZn FLxYl33mhOnxC+OAGSRPN5LOuBrjAcscWaZ1jLyXAcMZvdS4/RvtaOR95SWUwbiZnRR5 uynlfJ+TNYIx5PF+Matc1cobW3syw2vvwftL5zBZxlpKT48SL1sXmn/K3WGF57XdApBS LB+mApj/d6ITVZ/mMZHXj7tvPJlrQqeRceRGIGTFTP/wmmyqNWBUGAoPbAONNxSYgnI+ obrA== X-Gm-Message-State: AOAM531xRblzLt3JUvbYu6cgFzZ7RDqO2tiCgrja7QbPhd+kVamTFe6d NRuz0FLFZhkC6t3VXXeq+fk= X-Google-Smtp-Source: ABdhPJwYsSVs2+47kPqwZ7S9KJ/xel7YEbym0BuzytptUeXEEIrXhSNOMQwqinZ+9lUxvDI5fQjMBA== X-Received: by 2002:a7b:cb54:: with SMTP id v20mr11939959wmj.149.1604884975502; Sun, 08 Nov 2020 17:22:55 -0800 (PST) Received: from ?IPv6:2a02:8084:e84:2480:228:f8ff:fe6f:83a8? ([2a02:8084:e84:2480:228:f8ff:fe6f:83a8]) by smtp.gmail.com with ESMTPSA id p4sm11335401wrm.51.2020.11.08.17.22.53 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 08 Nov 2020 17:22:54 -0800 (PST) Subject: Re: [PATCH 12/19] x86/signal: Land on &frame->retcode when vdso isn't mapped To: Andy Lutomirski , Dmitry Safonov Cc: LKML , Alexander Viro , Andrew Morton , Arnd Bergmann , Borislav Petkov , Catalin Marinas , Christophe Leroy , Guo Ren , "H. Peter Anvin" , Ingo Molnar , Oleg Nesterov , Russell King , Thomas Bogendoerfer , Thomas Gleixner , Vincenzo Frascino , Will Deacon , X86 ML References: <20201108051730.2042693-1-dima@arista.com> <20201108051730.2042693-13-dima@arista.com> From: Dmitry Safonov <0x7f454c46@gmail.com> Message-ID: <6ac99ea6-ccad-2719-5ff2-a0e18e52a500@gmail.com> Date: Mon, 9 Nov 2020 01:22:52 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.12.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 11/8/20 7:06 PM, Andy Lutomirski wrote: > On Sat, Nov 7, 2020 at 9:17 PM Dmitry Safonov wrote: >> >> Since commit 9fbbd4dd17d0 ("x86: Don't require the vDSO for handling >> a.out signals") after processing 32-bit signal if there is no vdso >> mapped frame->retcode is used as a landing. >> Do the same for rt ia32 signals. > > Am I reading correctly that this makes the ia32 compat signals match > the native ia32 case? Yes, probably I should have added it to the changelog. Thanks, Dmitry