From patchwork Tue Sep 1 15:10:38 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 310209 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=-10.0 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 8EB3BC433E6 for ; Tue, 1 Sep 2020 17:09:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 684DF206FA for ; Tue, 1 Sep 2020 17:09:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598980195; bh=Lryw0f1Nbw9zOBSfGU+aYbC7z1GWIMz3wMR7aAvU97E=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=lVcF2Lr9daQFdk0u+wY/8gM+/tBAx4CVcrTMtGHL6Sg4JpbR/mFHTShBNxepMRmRG uJR1D5oXfoHIcwGlj757raVqJLJhZ3t9iVUH/PHEQDjWViF1Kf4YvYON7pPvv5eu7b ir1d5wF4hRlTDQV/wnYkvgGb/5sHnNFIG4RON+aU= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729156AbgIAPRW (ORCPT ); Tue, 1 Sep 2020 11:17:22 -0400 Received: from mail.kernel.org ([198.145.29.99]:34724 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729397AbgIAPRV (ORCPT ); Tue, 1 Sep 2020 11:17:21 -0400 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 D01E820767; Tue, 1 Sep 2020 15:17:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598973440; bh=Lryw0f1Nbw9zOBSfGU+aYbC7z1GWIMz3wMR7aAvU97E=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=qCaqX0Ok2T6tOSAVDI03qKxERsAu25x0Gogr6GEjsmvA/gWegMHPvlAQinay0RuyQ teB7soXMJka9HOzsGa0oM8QimDwaQvM7X5fOv7PHwcUvxcTcximdbCzTYPpnoeLlMH uissGZhuJE/EAkbafQwJDpWLYfQ5VnroEd/a/0oY= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Roman Shaposhnik , Thomas Gleixner , Juergen Gross Subject: [PATCH 4.9 62/78] XEN uses irqdesc::irq_data_common::handler_data to store a per interrupt XEN data pointer which contains XEN specific information. Date: Tue, 1 Sep 2020 17:10:38 +0200 Message-Id: <20200901150927.881584554@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200901150924.680106554@linuxfoundation.org> References: <20200901150924.680106554@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Thomas Gleixner commit c330fb1ddc0a922f044989492b7fcca77ee1db46 upstream. handler data is meant for interrupt handlers and not for storing irq chip specific information as some devices require handler data to store internal per interrupt information, e.g. pinctrl/GPIO chained interrupt handlers. This obviously creates a conflict of interests and crashes the machine because the XEN pointer is overwritten by the driver pointer. As the XEN data is not handler specific it should be stored in irqdesc::irq_data::chip_data instead. A simple sed s/irq_[sg]et_handler_data/irq_[sg]et_chip_data/ cures that. Cc: stable@vger.kernel.org Reported-by: Roman Shaposhnik Signed-off-by: Thomas Gleixner Tested-by: Roman Shaposhnik Reviewed-by: Juergen Gross Link: https://lore.kernel.org/r/87lfi2yckt.fsf@nanos.tec.linutronix.de Signed-off-by: Juergen Gross Signed-off-by: Greg Kroah-Hartman --- drivers/xen/events/events_base.c | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) --- a/drivers/xen/events/events_base.c +++ b/drivers/xen/events/events_base.c @@ -155,7 +155,7 @@ int get_evtchn_to_irq(unsigned evtchn) /* Get info for IRQ */ struct irq_info *info_for_irq(unsigned irq) { - return irq_get_handler_data(irq); + return irq_get_chip_data(irq); } /* Constructors for packed IRQ information. */ @@ -384,7 +384,7 @@ static void xen_irq_init(unsigned irq) info->type = IRQT_UNBOUND; info->refcnt = -1; - irq_set_handler_data(irq, info); + irq_set_chip_data(irq, info); list_add_tail(&info->list, &xen_irq_list_head); } @@ -433,14 +433,14 @@ static int __must_check xen_allocate_irq static void xen_free_irq(unsigned irq) { - struct irq_info *info = irq_get_handler_data(irq); + struct irq_info *info = irq_get_chip_data(irq); if (WARN_ON(!info)) return; list_del(&info->list); - irq_set_handler_data(irq, NULL); + irq_set_chip_data(irq, NULL); WARN_ON(info->refcnt > 0); @@ -610,7 +610,7 @@ EXPORT_SYMBOL_GPL(xen_irq_from_gsi); static void __unbind_from_irq(unsigned int irq) { int evtchn = evtchn_from_irq(irq); - struct irq_info *info = irq_get_handler_data(irq); + struct irq_info *info = irq_get_chip_data(irq); if (info->refcnt > 0) { info->refcnt--; @@ -1114,7 +1114,7 @@ int bind_ipi_to_irqhandler(enum ipi_vect void unbind_from_irqhandler(unsigned int irq, void *dev_id) { - struct irq_info *info = irq_get_handler_data(irq); + struct irq_info *info = irq_get_chip_data(irq); if (WARN_ON(!info)) return; @@ -1148,7 +1148,7 @@ int evtchn_make_refcounted(unsigned int if (irq == -1) return -ENOENT; - info = irq_get_handler_data(irq); + info = irq_get_chip_data(irq); if (!info) return -ENOENT; @@ -1176,7 +1176,7 @@ int evtchn_get(unsigned int evtchn) if (irq == -1) goto done; - info = irq_get_handler_data(irq); + info = irq_get_chip_data(irq); if (!info) goto done;