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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 00E48C433EF for ; Sun, 5 Jun 2022 13:57:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1351105AbiFEN5A (ORCPT ); Sun, 5 Jun 2022 09:57:00 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40210 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1348492AbiFEN4M (ORCPT ); Sun, 5 Jun 2022 09:56:12 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C56741054A; Sun, 5 Jun 2022 06:55:34 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 972CEB80D6B; Sun, 5 Jun 2022 13:55:30 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3CA79C34115; Sun, 5 Jun 2022 13:55:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1654437329; bh=aUep4enDS2rEm1cqYLVP0bI+LmbTqMVDSvrpQnmDAJw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Jog6eZMkjswv96m3eHKe+6C8+w0naZO37gDXChbdBh6kfac+3G5LJqwym3Gz+1uz8 I0r72YcRRnu2aAN9Ni7URqCKbY4OR3jSsMslkps4Wb2L9YvgKPEdxL1+IIfPC6Ms86 ONhlsfBLEcgusXQP/4mlwNNKrHmaC8HuHePkDHqL/MPH30tIPWYDhetvR0cnNKf1EJ lOngzAFOJXMyELghkMYrT+scLgne/eCtlql9LdboEnhh9WzZM04m0kHcA1COfdN2Zd jH2MWs2xpWdfj1FP9hw2EA+b/BNAOojk51/Ho0ne41Zf2CZMtef6qZ7x12MxIMkY1/ C5PVpBTjxqA5Q== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: "Maciej W. Rozycki" , Thomas Gleixner , Sasha Levin , bhelgaas@google.com, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, linux-pci@vger.kernel.org Subject: [PATCH MANUALSEL 4.19 4/4] x86/PCI: Add PIRQ routing table range checks Date: Sun, 5 Jun 2022 09:55:14 -0400 Message-Id: <20220605135519.61765-4-sashal@kernel.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220605135519.61765-1-sashal@kernel.org> References: <20220605135519.61765-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: "Maciej W. Rozycki" [ Upstream commit 5d64089aa4a5bd3d7e00e3d6ddf4943dd34627b3 ] Verify that the PCI IRQ Routing Table header as well as individual slot entries are all wholly contained within the BIOS memory area. Do not even call the checksum calculator if the header would overrun the area and then bail out early if any slot would. Signed-off-by: Maciej W. Rozycki Signed-off-by: Thomas Gleixner Link: https://lore.kernel.org/r/alpine.DEB.2.21.2203301735510.22465@angie.orcam.me.uk Signed-off-by: Sasha Levin --- arch/x86/pci/irq.c | 17 ++++++++++++----- 1 file changed, 12 insertions(+), 5 deletions(-) diff --git a/arch/x86/pci/irq.c b/arch/x86/pci/irq.c index d3a73f9335e1..2bf6d2c4874b 100644 --- a/arch/x86/pci/irq.c +++ b/arch/x86/pci/irq.c @@ -62,7 +62,8 @@ void (*pcibios_disable_irq)(struct pci_dev *dev) = pirq_disable_irq; * and perform checksum verification. */ -static inline struct irq_routing_table *pirq_check_routing_table(u8 *addr) +static inline struct irq_routing_table *pirq_check_routing_table(u8 *addr, + u8 *limit) { struct irq_routing_table *rt; int i; @@ -72,7 +73,8 @@ static inline struct irq_routing_table *pirq_check_routing_table(u8 *addr) if (rt->signature != PIRQ_SIGNATURE || rt->version != PIRQ_VERSION || rt->size % 16 || - rt->size < sizeof(struct irq_routing_table)) + rt->size < sizeof(struct irq_routing_table) || + (limit && rt->size > limit - addr)) return NULL; sum = 0; for (i = 0; i < rt->size; i++) @@ -93,17 +95,22 @@ static inline struct irq_routing_table *pirq_check_routing_table(u8 *addr) static struct irq_routing_table * __init pirq_find_routing_table(void) { + u8 * const bios_start = (u8 *)__va(0xf0000); + u8 * const bios_end = (u8 *)__va(0x100000); u8 *addr; struct irq_routing_table *rt; if (pirq_table_addr) { - rt = pirq_check_routing_table((u8 *) __va(pirq_table_addr)); + rt = pirq_check_routing_table((u8 *)__va(pirq_table_addr), + NULL); if (rt) return rt; printk(KERN_WARNING "PCI: PIRQ table NOT found at pirqaddr\n"); } - for (addr = (u8 *) __va(0xf0000); addr < (u8 *) __va(0x100000); addr += 16) { - rt = pirq_check_routing_table(addr); + for (addr = bios_start; + addr < bios_end - sizeof(struct irq_routing_table); + addr += 16) { + rt = pirq_check_routing_table(addr, bios_end); if (rt) return rt; } -- 2.35.1