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 5C288C46467 for ; Mon, 7 Feb 2022 11:37:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1384721AbiBGL3o (ORCPT ); Mon, 7 Feb 2022 06:29:44 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34402 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1383302AbiBGLWF (ORCPT ); Mon, 7 Feb 2022 06:22:05 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4BC87C0401C0; Mon, 7 Feb 2022 03:22:04 -0800 (PST) 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 dfw.source.kernel.org (Postfix) with ESMTPS id AAF0E61380; Mon, 7 Feb 2022 11:22:03 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 446C6C004E1; Mon, 7 Feb 2022 11:22:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1644232923; bh=qGx8pLorX6OJ0M3ZEKrK/Gl5ED4V6pQ8BoJGOTE1Dts=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=uGnzqlTiR7wML5f9KqCkF4iUYmIUYViR4ZjvqSzpjV9Z+kCbNqT6ImVo8ihgrruQv Uzj8tb2hrWeJok4vm9KddbcKIiKbFad32a354tzNGTaaRH5pylS2hVJS9XrOMJ0vYS toTru6tvIiX7vkaqpKQTDc7D7bVS6hrWwVHHA/2M= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Pasha Tatashin , Zi Yan , David Rientjes , Anshuman Khandual , Paul Turner , Wei Xu , Greg Thelen , Ingo Molnar , Will Deacon , Mike Rapoport , Dave Hansen , "H. Peter Anvin" , "Aneesh Kumar K.V" , Jiri Slaby , Muchun Song , Hugh Dickins , Andrew Morton , Linus Torvalds Subject: [PATCH 5.10 17/74] mm/debug_vm_pgtable: remove pte entry from the page table Date: Mon, 7 Feb 2022 12:06:15 +0100 Message-Id: <20220207103757.797627637@linuxfoundation.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220207103757.232676988@linuxfoundation.org> References: <20220207103757.232676988@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Pasha Tatashin commit fb5222aae64fe25e5f3ebefde8214dcf3ba33ca5 upstream. Patch series "page table check fixes and cleanups", v5. This patch (of 4): The pte entry that is used in pte_advanced_tests() is never removed from the page table at the end of the test. The issue is detected by page_table_check, to repro compile kernel with the following configs: CONFIG_DEBUG_VM_PGTABLE=y CONFIG_PAGE_TABLE_CHECK=y CONFIG_PAGE_TABLE_CHECK_ENFORCED=y During the boot the following BUG is printed: debug_vm_pgtable: [debug_vm_pgtable ]: Validating architecture page table helpers ------------[ cut here ]------------ kernel BUG at mm/page_table_check.c:162! invalid opcode: 0000 [#1] PREEMPT SMP PTI CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.16.0-11413-g2c271fe77d52 #3 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.15.0-0-g2dd4b9b3f840-prebuilt.qemu.org 04/01/2014 ... The entry should be properly removed from the page table before the page is released to the free list. Link: https://lkml.kernel.org/r/20220131203249.2832273-1-pasha.tatashin@soleen.com Link: https://lkml.kernel.org/r/20220131203249.2832273-2-pasha.tatashin@soleen.com Fixes: a5c3b9ffb0f4 ("mm/debug_vm_pgtable: add tests validating advanced arch page table helpers") Signed-off-by: Pasha Tatashin Reviewed-by: Zi Yan Tested-by: Zi Yan Acked-by: David Rientjes Reviewed-by: Anshuman Khandual Cc: Paul Turner Cc: Wei Xu Cc: Greg Thelen Cc: Ingo Molnar Cc: Will Deacon Cc: Mike Rapoport Cc: Dave Hansen Cc: H. Peter Anvin Cc: Aneesh Kumar K.V Cc: Jiri Slaby Cc: Muchun Song Cc: Hugh Dickins Cc: [5.9+] Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman --- mm/debug_vm_pgtable.c | 2 ++ 1 file changed, 2 insertions(+) --- a/mm/debug_vm_pgtable.c +++ b/mm/debug_vm_pgtable.c @@ -128,6 +128,8 @@ static void __init pte_advanced_tests(st ptep_test_and_clear_young(vma, vaddr, ptep); pte = ptep_get(ptep); WARN_ON(pte_young(pte)); + + ptep_get_and_clear_full(mm, vaddr, ptep, 1); } static void __init pte_savedwrite_tests(unsigned long pfn, pgprot_t prot)