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=-1.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,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 531A9C7618B for ; Sun, 28 Jul 2019 14:39:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2087F2087C for ; Sun, 28 Jul 2019 14:39:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1564324756; bh=lCfL0JdIrTUO801HegwwTrN18MqwJBgPDFYfRszjWoE=; h=References:In-Reply-To:From:Date:Subject:To:Cc:List-ID:From; b=JnOv5L9GBzbmNiYQgH4CEz05i5G7Ej1Et+mJmlhRLSki22proINmFPSz61vYsPtUJ Nqx9B6fog6zcXLek0FuBhXSmTBxNktR8bSzGr47hR1ixVZvySYlAy+HjZwlPCC9vGq 9oTG41ttqGuj9n401rLGXr6I08idZUjMJa3JCO8M= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726180AbfG1OjP (ORCPT ); Sun, 28 Jul 2019 10:39:15 -0400 Received: from mail.kernel.org ([198.145.29.99]:41220 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726032AbfG1OjO (ORCPT ); Sun, 28 Jul 2019 10:39:14 -0400 Received: from mail-wm1-f48.google.com (mail-wm1-f48.google.com [209.85.128.48]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id B8028216F4 for ; Sun, 28 Jul 2019 14:39:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1564324754; bh=lCfL0JdIrTUO801HegwwTrN18MqwJBgPDFYfRszjWoE=; h=References:In-Reply-To:From:Date:Subject:To:Cc:From; b=TaYjbI4K7ngbG4enkfJjfrQB3On6MHzfmr269GOm/SbEF5G/BVv90hNv7O9XvlkL0 8/36ve8U/05dvpK/zwSlPP8CAOwEiwaKr68mQk/daIrxSjZTC6DR1TnYAm99ntQToP faqObshG+GfmWD+wOGXGItJL3GF1K5Tzlc/ameTg= Received: by mail-wm1-f48.google.com with SMTP id p74so51609274wme.4 for ; Sun, 28 Jul 2019 07:39:13 -0700 (PDT) X-Gm-Message-State: APjAAAWlszSwpjn8YqX1HvToGWt1Ufhj/dBaXUaIMjaSH6BEYpsiojZ+ eLSlp96X+HHzjrIAXTRvKX3K/dIzjucpFnK7daOOnA== X-Google-Smtp-Source: APXvYqwrT6VghjvoT5F4nguyGnG9FNdj3/nFT1Dlf8kgEsku6lgd0P68s/576YH0XZW8Wtns/8ehY32rDriRSC4PwiE= X-Received: by 2002:a7b:c149:: with SMTP id z9mr98310289wmi.0.1564324752124; Sun, 28 Jul 2019 07:39:12 -0700 (PDT) MIME-Version: 1.0 References: <20190728131251.622415456@linutronix.de> <20190728131648.786513965@linutronix.de> In-Reply-To: <20190728131648.786513965@linutronix.de> From: Andy Lutomirski Date: Sun, 28 Jul 2019 07:39:01 -0700 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [patch 3/5] lib/vdso/32: Provide legacy syscall fallbacks To: Thomas Gleixner Cc: LKML , X86 ML , Andy Lutomirski , Vincenzo Frascino , Sean Christopherson , Kees Cook , Paul Bolle , Will Deacon Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, Jul 28, 2019 at 6:20 AM Thomas Gleixner wrote: > > To address the regression which causes seccomp to deny applications the > access to clock_gettime64() and clock_getres64() syscalls because they > are not enabled in the existing filters. > > That trips over the fact that 32bit VDSOs use the new clock_gettime64() and > clock_getres64() syscalls in the fallback path. > > Implement a __cvdso_clock_get*time32() variants which invokes the legacy > 32bit syscalls when the architecture requests it. > > The conditional can go away once all architectures are converted. Reviewed-by: Andy Lutomirski