From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751306AbdEPBRt (ORCPT ); Mon, 15 May 2017 21:17:49 -0400 Received: from mail-pf0-f194.google.com ([209.85.192.194]:34690 "EHLO mail-pf0-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751040AbdEPBRq (ORCPT ); Mon, 15 May 2017 21:17:46 -0400 From: js1304@gmail.com X-Google-Original-From: iamjoonsoo.kim@lge.com To: Andrew Morton Cc: Andrey Ryabinin , Alexander Potapenko , Dmitry Vyukov , kasan-dev@googlegroups.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Thomas Gleixner , Ingo Molnar , "H . Peter Anvin" , kernel-team@lge.com, Joonsoo Kim Subject: [PATCH v1 03/11] mm/kasan: handle unaligned end address in zero_pte_populate Date: Tue, 16 May 2017 10:16:41 +0900 Message-Id: <1494897409-14408-4-git-send-email-iamjoonsoo.kim@lge.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1494897409-14408-1-git-send-email-iamjoonsoo.kim@lge.com> References: <1494897409-14408-1-git-send-email-iamjoonsoo.kim@lge.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Joonsoo Kim It doesn't handle unaligned end address so last pte could not be initialized. Fix it. Note that this shadow memory can be used by others so map the actual page in this case. Signed-off-by: Joonsoo Kim --- mm/kasan/kasan_init.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/mm/kasan/kasan_init.c b/mm/kasan/kasan_init.c index 554e4c0..48559d9 100644 --- a/mm/kasan/kasan_init.c +++ b/mm/kasan/kasan_init.c @@ -61,6 +61,14 @@ static void __init zero_pte_populate(pmd_t *pmd, unsigned long addr, addr += PAGE_SIZE; pte = pte_offset_kernel(pmd, addr); } + + if (addr == end) + return; + + /* Population for unaligned end address */ + zero_pte = pfn_pte(PFN_DOWN( + __pa(early_alloc(PAGE_SIZE, NUMA_NO_NODE))), PAGE_KERNEL); + set_pte_at(&init_mm, addr, pte, zero_pte); } static void __init zero_pmd_populate(pud_t *pud, unsigned long addr, -- 2.7.4