From mboxrd@z Thu Jan 1 00:00:00 1970 Received: with ECARTIS (v1.0.0; list linux-mips); Mon, 14 Nov 2016 03:07:18 +0100 (CET) Received: from shadbolt.e.decadent.org.uk ([88.96.1.126]:37990 "EHLO shadbolt.e.decadent.org.uk" rhost-flags-OK-OK-OK-OK) by eddie.linux-mips.org with ESMTP id S23992161AbcKNCE0NSOYO (ORCPT ); Mon, 14 Nov 2016 03:04:26 +0100 Received: from [2a02:8011:400e:2:6f00:88c8:c921:d332] (helo=deadeye) by shadbolt.decadent.org.uk with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.84_2) (envelope-from ) id 1c66d9-0005pB-Ch; Mon, 14 Nov 2016 02:04:20 +0000 Received: from ben by deadeye with local (Exim 4.87) (envelope-from ) id 1c66d8-0000XV-Ch; Mon, 14 Nov 2016 02:04:18 +0000 Content-Type: text/plain; charset="UTF-8" Content-Disposition: inline Content-Transfer-Encoding: 8bit MIME-Version: 1.0 From: Ben Hutchings To: linux-kernel@vger.kernel.org, stable@vger.kernel.org CC: akpm@linux-foundation.org, "Paolo Bonzini" , kvm@vger.kernel.org, "Radim =?UTF-8?Q?Kr=C4=8Dm=C3=A1=C5=99?=" , "Ralf Baechle" , "James Hogan" , linux-mips@linux-mips.org Date: Mon, 14 Nov 2016 00:14:20 +0000 Message-ID: X-Mailer: LinuxStableQueue (scripts by bwh) Subject: [PATCH 3.16 177/346] MIPS: KVM: Fix gfn range check in kseg0 tlb faults In-Reply-To: X-SA-Exim-Connect-IP: 2a02:8011:400e:2:6f00:88c8:c921:d332 X-SA-Exim-Mail-From: ben@decadent.org.uk X-SA-Exim-Scanned: No (on shadbolt.decadent.org.uk); SAEximRunCond expanded to false Return-Path: X-Envelope-To: <"|/home/ecartis/ecartis -s linux-mips"> (uid 0) X-Orcpt: rfc822;linux-mips@linux-mips.org Original-Recipient: rfc822;linux-mips@linux-mips.org X-archive-position: 55801 X-ecartis-version: Ecartis v1.0.0 Sender: linux-mips-bounce@linux-mips.org Errors-to: linux-mips-bounce@linux-mips.org X-original-sender: ben@decadent.org.uk Precedence: bulk List-help: List-unsubscribe: List-software: Ecartis version 1.0.0 List-Id: linux-mips X-List-ID: linux-mips List-subscribe: List-owner: List-post: List-archive: X-list: linux-mips 3.16.39-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: James Hogan commit 0741f52d1b980dbeb290afe67d88fc2928edd8ab upstream. Two consecutive gfns are loaded into host TLB, so ensure the range check isn't off by one if guest_pmap_npages is odd. Fixes: 858dd5d45733 ("KVM/MIPS32: MMU/TLB operations for the Guest.") Signed-off-by: James Hogan Cc: Paolo Bonzini Cc: "Radim Krčmář" Cc: Ralf Baechle Cc: linux-mips@linux-mips.org Cc: kvm@vger.kernel.org Signed-off-by: Radim Krčmář [bwh: Backported to 3.16: adjust filename] Signed-off-by: Ben Hutchings --- arch/mips/kvm/kvm_tlb.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/arch/mips/kvm/kvm_tlb.c +++ b/arch/mips/kvm/kvm_tlb.c @@ -278,7 +278,7 @@ int kvm_mips_handle_kseg0_tlb_fault(unsi } gfn = (KVM_GUEST_CPHYSADDR(badvaddr) >> PAGE_SHIFT); - if (gfn >= kvm->arch.guest_pmap_npages) { + if ((gfn | 1) >= kvm->arch.guest_pmap_npages) { kvm_err("%s: Invalid gfn: %#llx, BadVaddr: %#lx\n", __func__, gfn, badvaddr); kvm_mips_dump_host_tlbs();