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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,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 265A2C43603 for ; Thu, 19 Dec 2019 18:49:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id EFE1524672 for ; Thu, 19 Dec 2019 18:49:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1576781363; bh=GqAFOTv0a9RtHQ56hi09qCi4T7GetSCA3QHzEhxSVjs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=d4qcYpus9heJkWMqNAFMM2laINTvYha5vb8QmwSJWqFtpaukcifz+uyll+f/JtQjs 46qyHAJ9D++DPB4CyIlMJ0GhqEgCTru5hqqRQkLleXRxQCckLZ6i9QRCG5p9Taay+2 tPHR63Rawyy9dH3Iihe0OuraGF8oYixih3b8JzUw= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729768AbfLSStV (ORCPT ); Thu, 19 Dec 2019 13:49:21 -0500 Received: from mail.kernel.org ([198.145.29.99]:42708 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729760AbfLSStR (ORCPT ); Thu, 19 Dec 2019 13:49:17 -0500 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (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 77E1924672; Thu, 19 Dec 2019 18:49:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1576781357; bh=GqAFOTv0a9RtHQ56hi09qCi4T7GetSCA3QHzEhxSVjs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=iWtcppm72CEJ/Nr48IACVPZoVjDWCvCXKaZ0Wy1CJ/34VFHOMzaOsxRqJxGkM1D6u uHvKgCKqsNza9l7qEfL5+bGTyuzTOeYTn9QJqWVks7uwzrRX+D8Zc67Fbk4lDFNDWk nZAK8VQXqD0hMeZ87z7PSFBi6Yq0zyO6u3BIs7Ug= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Max Filippov Subject: [PATCH 4.9 188/199] xtensa: fix TLB sanity checker Date: Thu, 19 Dec 2019 19:34:30 +0100 Message-Id: <20191219183226.118463276@linuxfoundation.org> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20191219183214.629503389@linuxfoundation.org> References: <20191219183214.629503389@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Max Filippov commit 36de10c4788efc6efe6ff9aa10d38cb7eea4c818 upstream. Virtual and translated addresses retrieved by the xtensa TLB sanity checker must be consistent, i.e. correspond to the same state of the checked TLB entry. KASAN shadow memory is mapped dynamically using auto-refill TLB entries and thus may change TLB state between the virtual and translated address retrieval, resulting in false TLB insanity report. Move read_xtlb_translation close to read_xtlb_virtual to make sure that read values are consistent. Cc: stable@vger.kernel.org Fixes: a99e07ee5e88 ("xtensa: check TLB sanity on return to userspace") Signed-off-by: Max Filippov Signed-off-by: Greg Kroah-Hartman --- arch/xtensa/mm/tlb.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/arch/xtensa/mm/tlb.c +++ b/arch/xtensa/mm/tlb.c @@ -218,6 +218,8 @@ static int check_tlb_entry(unsigned w, u unsigned tlbidx = w | (e << PAGE_SHIFT); unsigned r0 = dtlb ? read_dtlb_virtual(tlbidx) : read_itlb_virtual(tlbidx); + unsigned r1 = dtlb ? + read_dtlb_translation(tlbidx) : read_itlb_translation(tlbidx); unsigned vpn = (r0 & PAGE_MASK) | (e << PAGE_SHIFT); unsigned pte = get_pte_for_vaddr(vpn); unsigned mm_asid = (get_rasid_register() >> 8) & ASID_MASK; @@ -233,8 +235,6 @@ static int check_tlb_entry(unsigned w, u } if (tlb_asid == mm_asid) { - unsigned r1 = dtlb ? read_dtlb_translation(tlbidx) : - read_itlb_translation(tlbidx); if ((pte ^ r1) & PAGE_MASK) { pr_err("%cTLB: way: %u, entry: %u, mapping: %08x->%08x, PTE: %08x\n", dtlb ? 'D' : 'I', w, e, r0, r1, pte);