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, 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 1F22DC7618B for ; Sun, 28 Jul 2019 14:50:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E43722064C for ; Sun, 28 Jul 2019 14:50:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1564325454; bh=X7hFTPq+VOJrwjcV0K1VA1iH3ggRNdqMyY0XEmfMbWw=; h=References:In-Reply-To:From:Date:Subject:To:Cc:List-ID:From; b=azh0YwFhEK5E+aIfy3FJOxnPlLWFQSmQRYIa8J9smyqWC3XLMCxlY8E2UV9VuXx02 ZceM2dUr0eD22ackZz1UJtpferCTes+jvuquPM/BZtWcBBd7qjEOp24E0aJmSFQDdz 4HpsKvCgQSwVz3QkMvpqn5oZrnNnDioSivQgorV8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726163AbfG1Ouw (ORCPT ); Sun, 28 Jul 2019 10:50:52 -0400 Received: from mail.kernel.org ([198.145.29.99]:42082 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726043AbfG1Ouw (ORCPT ); Sun, 28 Jul 2019 10:50:52 -0400 Received: from mail-wm1-f45.google.com (mail-wm1-f45.google.com [209.85.128.45]) (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 4BC4921655 for ; Sun, 28 Jul 2019 14:50:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1564325451; bh=X7hFTPq+VOJrwjcV0K1VA1iH3ggRNdqMyY0XEmfMbWw=; h=References:In-Reply-To:From:Date:Subject:To:Cc:From; b=MGObo1m6hdwWEA31EKdolfhteD4+QjYpTjQYIetLHI14/rqJle51qjtcwqkpvIBvR xwhqiPITe55ggfD43EdzvRKMmgB2hPp8O72mco1TvURWgldjQ6uc1wm6edKJgUCJsx T1E67AjZvEUxZX2RHdgOPW6INVkMO0h0dIapn3Dc= Received: by mail-wm1-f45.google.com with SMTP id v19so51332724wmj.5 for ; Sun, 28 Jul 2019 07:50:51 -0700 (PDT) X-Gm-Message-State: APjAAAXWtJPSzJf4z9sjEEIveGGRuIg0usWe84YNkIau9JRQ0h+HsbmW pYokTK6AKjEzEm6r42s/ULwnX1u8sOaRDl9LXzq4uA== X-Google-Smtp-Source: APXvYqz2QxhlN2yYUUJWCB9rpAZ+QKc/H2PCjh52I7/41f9ugEJdqSx2Nwy+zU/3cN+TLYG5AcbyNYhCJtrxGpey0Cw= X-Received: by 2002:a1c:a942:: with SMTP id s63mr93823177wme.76.1564325449803; Sun, 28 Jul 2019 07:50:49 -0700 (PDT) MIME-Version: 1.0 References: <20190728131251.622415456@linutronix.de> <20190728131648.879156507@linutronix.de> In-Reply-To: <20190728131648.879156507@linutronix.de> From: Andy Lutomirski Date: Sun, 28 Jul 2019 07:50:38 -0700 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [patch 4/5] x86/vdso/32: Use 32bit syscall fallback 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: > > The generic VDSO implementation uses the Y2038 safe clock_gettime64() and > clock_getres_time64() syscalls as fallback for 32bit VDSO. This breaks > seccomp setups because these syscalls might be not (yet) allowed. > > Implement the 32bit variants which use the legacy syscalls and select the > variant in the core library. > > The 64bit time variants are not removed because they are required for the > time64 based vdso accessors. Reviewed-by: Andy Lutomirski