From patchwork Mon Nov 2 12:17:10 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Juergen Gross X-Patchwork-Id: 317315 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=-12.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham 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 E1F82C55178 for ; Mon, 2 Nov 2020 12:17:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9A5E322277 for ; Mon, 2 Nov 2020 12:17:26 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=suse.com header.i=@suse.com header.b="mVcUuHhz" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728359AbgKBMRZ (ORCPT ); Mon, 2 Nov 2020 07:17:25 -0500 Received: from mx2.suse.de ([195.135.220.15]:48062 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728626AbgKBMRZ (ORCPT ); Mon, 2 Nov 2020 07:17:25 -0500 X-Virus-Scanned: by amavisd-new at test-mx.suse.de DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1604319443; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=PFyLwh4kPOhMumz4Kjuj/7SzN2WgUKA80deEKk/G/X4=; b=mVcUuHhzD8+1pW88JHoWuHH2Rsg9qHbYYTRad9RQjwpIQX7A6y/ucXmQdFlceEemlDQii5 mFg+LT1qWB/YV3aahgjpo6MY0+C4QgAW6fF1xgIIaH5uH3/f/ShmU9U5AF3i3pYtPWpMWT tzQWPaZiiK+dFIpAL4ejuIk0dNh0Iz4= Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 8D01FAE69 for ; Mon, 2 Nov 2020 12:17:23 +0000 (UTC) From: Juergen Gross To: stable@vger.kernel.org Subject: [PATCH 02/14] xen/events: avoid removing an event channel while handling it Date: Mon, 2 Nov 2020 13:17:10 +0100 Message-Id: <20201102121722.10940-3-jgross@suse.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20201102121722.10940-1-jgross@suse.com> References: <20201102121722.10940-1-jgross@suse.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org Today it can happen that an event channel is being removed from the system while the event handling loop is active. This can lead to a race resulting in crashes or WARN() splats when trying to access the irq_info structure related to the event channel. Fix this problem by using a rwlock taken as reader in the event handling loop and as writer when deallocating the irq_info structure. As the observed problem was a NULL dereference in evtchn_from_irq() make this function more robust against races by testing the irq_info pointer to be not NULL before dereferencing it. And finally make all accesses to evtchn_to_irq[row][col] atomic ones in order to avoid seeing partial updates of an array element in irq handling. Note that irq handling can be entered only for event channels which have been valid before, so any not populated row isn't a problem in this regard, as rows are only ever added and never removed. This is XSA-331. This is upstream commit 073d0552ead5bfc7a3a9c01de590e924f11b5dd2 Cc: stable@vger.kernel.org Reported-by: Marek Marczykowski-Górecki Reported-by: Jinoh Kang Signed-off-by: Juergen Gross Reviewed-by: Stefano Stabellini Reviewed-by: Wei Liu --- drivers/xen/events/events_base.c | 41 ++++++++++++++++++++++++++++---- 1 file changed, 36 insertions(+), 5 deletions(-) diff --git a/drivers/xen/events/events_base.c b/drivers/xen/events/events_base.c index fdeeef2b9947..048c05615b77 100644 --- a/drivers/xen/events/events_base.c +++ b/drivers/xen/events/events_base.c @@ -32,6 +32,7 @@ #include #include #include +#include #ifdef CONFIG_X86 #include @@ -69,6 +70,23 @@ const struct evtchn_ops *evtchn_ops; */ static DEFINE_MUTEX(irq_mapping_update_lock); +/* + * Lock protecting event handling loop against removing event channels. + * Adding of event channels is no issue as the associated IRQ becomes active + * only after everything is setup (before request_[threaded_]irq() the handler + * can't be entered for an event, as the event channel will be unmasked only + * then). + */ +static DEFINE_RWLOCK(evtchn_rwlock); + +/* + * Lock hierarchy: + * + * irq_mapping_update_lock + * evtchn_rwlock + * IRQ-desc lock + */ + static LIST_HEAD(xen_irq_list_head); /* IRQ <-> VIRQ mapping. */ @@ -103,7 +121,7 @@ static void clear_evtchn_to_irq_row(unsigned row) unsigned col; for (col = 0; col < EVTCHN_PER_ROW; col++) - evtchn_to_irq[row][col] = -1; + WRITE_ONCE(evtchn_to_irq[row][col], -1); } static void clear_evtchn_to_irq_all(void) @@ -140,7 +158,7 @@ static int set_evtchn_to_irq(unsigned evtchn, unsigned irq) clear_evtchn_to_irq_row(row); } - evtchn_to_irq[row][col] = irq; + WRITE_ONCE(evtchn_to_irq[row][col], irq); return 0; } @@ -150,7 +168,7 @@ int get_evtchn_to_irq(unsigned evtchn) return -1; if (evtchn_to_irq[EVTCHN_ROW(evtchn)] == NULL) return -1; - return evtchn_to_irq[EVTCHN_ROW(evtchn)][EVTCHN_COL(evtchn)]; + return READ_ONCE(evtchn_to_irq[EVTCHN_ROW(evtchn)][EVTCHN_COL(evtchn)]); } /* Get info for IRQ */ @@ -259,10 +277,14 @@ static void xen_irq_info_cleanup(struct irq_info *info) */ unsigned int evtchn_from_irq(unsigned irq) { - if (unlikely(WARN(irq >= nr_irqs, "Invalid irq %d!\n", irq))) + const struct irq_info *info = NULL; + + if (likely(irq < nr_irqs)) + info = info_for_irq(irq); + if (!info) return 0; - return info_for_irq(irq)->evtchn; + return info->evtchn; } unsigned irq_from_evtchn(unsigned int evtchn) @@ -438,16 +460,21 @@ static int __must_check xen_allocate_irq_gsi(unsigned gsi) static void xen_free_irq(unsigned irq) { struct irq_info *info = info_for_irq(irq); + unsigned long flags; if (WARN_ON(!info)) return; + write_lock_irqsave(&evtchn_rwlock, flags); + list_del(&info->list); set_info_for_irq(irq, NULL); WARN_ON(info->refcnt > 0); + write_unlock_irqrestore(&evtchn_rwlock, flags); + kfree(info); /* Legacy IRQ descriptors are managed by the arch. */ @@ -1233,6 +1260,8 @@ static void __xen_evtchn_do_upcall(void) int cpu = get_cpu(); unsigned count; + read_lock(&evtchn_rwlock); + do { vcpu_info->evtchn_upcall_pending = 0; @@ -1247,6 +1276,8 @@ static void __xen_evtchn_do_upcall(void) __this_cpu_write(xed_nesting_count, 0); } while (count != 1 || vcpu_info->evtchn_upcall_pending); + read_unlock(&evtchn_rwlock); + out: put_cpu();