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=-5.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 B4BA8C432BE for ; Mon, 30 Aug 2021 22:27:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8718460F6C for ; Mon, 30 Aug 2021 22:27:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238766AbhH3W1z (ORCPT ); Mon, 30 Aug 2021 18:27:55 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47144 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230140AbhH3W1x (ORCPT ); Mon, 30 Aug 2021 18:27:53 -0400 Received: from mail-lj1-x235.google.com (mail-lj1-x235.google.com [IPv6:2a00:1450:4864:20::235]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7FB8CC061575 for ; Mon, 30 Aug 2021 15:26:58 -0700 (PDT) Received: by mail-lj1-x235.google.com with SMTP id p15so28476982ljn.3 for ; Mon, 30 Aug 2021 15:26:58 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=e8bTVy6xugm2ewLkHD1CCCjL7QHYEiq4IESbLuCXtbA=; b=gJ2r8UITknbqczk85Qy7F+XABKxxjTy3zh9UV4KWQdsrd8WVIb63Qa/u1yKbsquFTW rztawTW+gZw9XYsXgrwOlph0C9EAKzhDmwE1BLbjXTK7/xVGN0xVzs1u3PkwJxpTmIZg pKnTP5a6ybwUyX409eBLyquVjIWirZzqqSyFE= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=e8bTVy6xugm2ewLkHD1CCCjL7QHYEiq4IESbLuCXtbA=; b=r1ZOD3IFQobY4ahUo6ZFsfr/ecFcqkkmTowoOgHo5z2puK9ih/vU2/vO6tmgjw6z1v KGiVoaiYhZVh0ImgMloWrJMugQSDeGBwL1bsv0OAp57PyF43LuSjYFkA0GjdtVjJ/zkV W2fp2tAnt6exKGai7iB7PYXGlVVOyqs9ktNtxwX/s0XQndjVwaIT5CjJ9EkUSzu0MPEu jGHht4mgixCri0gMTn1HmMY5oP6aDmb+Ed6yTarBpzhK41+fVfQKEEX3lDH5+nmWyKPv dIaOIdyXp/iACkss7AvB0eK+xMI/c2xT91rs3BJZpDQZikk+j7nGlshx9jfAQHSqyg8y LKlw== X-Gm-Message-State: AOAM532R4bZaJQdV6eWW1Bf6WzLKPFG7Lmj6pVhHNoaM+vbnn5ZnEoBQ CzWbqiXkeKqib0p+hLDh9ZHStVCRh5HuTELVS2w= X-Google-Smtp-Source: ABdhPJzYjJoETJK6mNprdmiDpFtAbWZVL5eahB2HrEHTYW/pbm+r6FjkFFQGLLFBRxKTgvPFo0UVrw== X-Received: by 2002:a2e:bd89:: with SMTP id o9mr21312690ljq.246.1630362416594; Mon, 30 Aug 2021 15:26:56 -0700 (PDT) Received: from mail-lj1-f170.google.com (mail-lj1-f170.google.com. [209.85.208.170]) by smtp.gmail.com with ESMTPSA id bt38sm1513008lfb.213.2021.08.30.15.26.55 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 30 Aug 2021 15:26:56 -0700 (PDT) Received: by mail-lj1-f170.google.com with SMTP id p15so28476922ljn.3 for ; Mon, 30 Aug 2021 15:26:55 -0700 (PDT) X-Received: by 2002:a2e:3004:: with SMTP id w4mr21512773ljw.465.1630362415442; Mon, 30 Aug 2021 15:26:55 -0700 (PDT) MIME-Version: 1.0 References: <20210830154702.247681585@linutronix.de> <20210830162545.374070793@linutronix.de> <87zgsyg0eg.ffs@tglx> <87o89efupd.ffs@tglx> In-Reply-To: <87o89efupd.ffs@tglx> From: Linus Torvalds Date: Mon, 30 Aug 2021 15:26:39 -0700 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [patch 01/10] x86/fpu/signal: Clarify exception handling in restore_fpregs_from_user() To: Thomas Gleixner Cc: Al Viro , Dan Williams , Borislav Petkov , LKML , "the arch/x86 maintainers" Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Aug 30, 2021 at 3:12 PM Thomas Gleixner wrote: > > It's not only about #MC. *RSTOR can also trigger #GP in case that the > user buffer contains garbage and we clearly don't want to loop forever > on that either. Ok, that does seem to merit a the error code check. Ugh. It leaves that #MC case for other random accesses, though. Linus