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=-9.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 7E2FDC388F9 for ; Tue, 3 Nov 2020 21:02:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 44C2A2242A for ; Tue, 3 Nov 2020 21:02:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604437359; bh=wi0aNJS4t9cijB/GMdL2NsV7IO6FsukuHpXIFapDTYQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=F3wYw9xpe3ume762oSoRbnaGbwe1kpr1OdWyYT8PmD1yvKlOyYphqJxyeC27v/7so Kyvg8G9959hG2ZmmkTmztVNLVhVDrKagGOMMlcifE9n5LdT7FBo5wBoFtCv0RE5+VC ij/Vzr6vqlP349U5IHm+HvJDFJRYgf4keJqczV68= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387673AbgKCVCi (ORCPT ); Tue, 3 Nov 2020 16:02:38 -0500 Received: from mail.kernel.org ([198.145.29.99]:39688 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387653AbgKCVCe (ORCPT ); Tue, 3 Nov 2020 16:02:34 -0500 Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 4EAAC21534; Tue, 3 Nov 2020 21:02:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604437353; bh=wi0aNJS4t9cijB/GMdL2NsV7IO6FsukuHpXIFapDTYQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=VI/02u/xPKcjM6BqB6G/if7DwoGo9AQ9inijYBu/X5rXMk/BUQfWBoGuED2ZIFscG +aKNGNPW79IZ0lRAz/OBnvP+6XnP9Rq+t6ZPZbjdFk5x/uy5ygNbyhA1UKBDR/Luq5 GFuEMK88Aibx8YhkxXSyXuFSmFR/q/24eWa69DDA= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Juergen Gross , Jan Beulich Subject: [PATCH 4.19 039/191] xen/events: fix race in evtchn_fifo_unmask() Date: Tue, 3 Nov 2020 21:35:31 +0100 Message-Id: <20201103203237.772222426@linuxfoundation.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201103203232.656475008@linuxfoundation.org> References: <20201103203232.656475008@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Juergen Gross commit f01337197419b7e8a492e83089552b77d3b5fb90 upstream. Unmasking a fifo event channel can result in unmasking it twice, once directly in the kernel and once via a hypercall in case the event was pending. Fix that by doing the local unmask only if the event is not pending. This is part of XSA-332. Cc: stable@vger.kernel.org Signed-off-by: Juergen Gross Reviewed-by: Jan Beulich Signed-off-by: Greg Kroah-Hartman --- drivers/xen/events/events_fifo.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) --- a/drivers/xen/events/events_fifo.c +++ b/drivers/xen/events/events_fifo.c @@ -227,19 +227,25 @@ static bool evtchn_fifo_is_masked(unsign return sync_test_bit(EVTCHN_FIFO_BIT(MASKED, word), BM(word)); } /* - * Clear MASKED, spinning if BUSY is set. + * Clear MASKED if not PENDING, spinning if BUSY is set. + * Return true if mask was cleared. */ -static void clear_masked(volatile event_word_t *word) +static bool clear_masked_cond(volatile event_word_t *word) { event_word_t new, old, w; w = *word; do { + if (w & (1 << EVTCHN_FIFO_PENDING)) + return false; + old = w & ~(1 << EVTCHN_FIFO_BUSY); new = old & ~(1 << EVTCHN_FIFO_MASKED); w = sync_cmpxchg(word, old, new); } while (w != old); + + return true; } static void evtchn_fifo_unmask(unsigned port) @@ -248,8 +254,7 @@ static void evtchn_fifo_unmask(unsigned BUG_ON(!irqs_disabled()); - clear_masked(word); - if (evtchn_fifo_is_pending(port)) { + if (!clear_masked_cond(word)) { struct evtchn_unmask unmask = { .port = port }; (void)HYPERVISOR_event_channel_op(EVTCHNOP_unmask, &unmask); }