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=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 46D5CC433EF for ; Mon, 6 Sep 2021 01:25:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2EDAE610FA for ; Mon, 6 Sep 2021 01:25:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240088AbhIFB0O (ORCPT ); Sun, 5 Sep 2021 21:26:14 -0400 Received: from mail.kernel.org ([198.145.29.99]:38982 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239808AbhIFBXy (ORCPT ); Sun, 5 Sep 2021 21:23:54 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 22186610A1; Mon, 6 Sep 2021 01:21:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1630891307; bh=qAskCBBpKq/zf9yjTKNuIJvUaCw27lib7tPv62mN0jI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=BgbDl2mQb7YH5PwSkiMv7uWcasXgOmKiN5v3bPrk+rQcpvbNW7KMyzNch3g9ZiUPh 2IiVdx3pJ6sEU4j74HaS3xGE3R94Clz+Yy4cXgIyCkKgft5NVYAM18DSm/+TSzfon0 Dlo6NL9bQmVg0RkefEr+lUcZaxlyH8m8xRMsB0Ry9L2TUQ1nd7k9Z2QDcTZ2llAmHl 0UZpqEhiojolWanhZ2gwvhm9cnHUZmiG4wz1Le58QOrAk63YuWbY7ddSgdz5Jh905O fVaHqIk/9pbQ9kp8vWxKpJORtJpBxGtLLMY/ZvGcTaAxZxypQX0+H805nFqtzLkbkd 8hnsQeaGWcDwA== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Alexander Gordeev , Vasily Gorbik , Heiko Carstens , Sasha Levin , kasan-dev@googlegroups.com, linux-s390@vger.kernel.org Subject: [PATCH AUTOSEL 5.13 42/46] s390/kasan: fix large PMD pages address alignment check Date: Sun, 5 Sep 2021 21:20:47 -0400 Message-Id: <20210906012052.929174-42-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210906012052.929174-1-sashal@kernel.org> References: <20210906012052.929174-1-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: linux-kernel@vger.kernel.org From: Alexander Gordeev [ Upstream commit ddd63c85ef67ea9ea7282ad35eafb6568047126e ] It is currently possible to initialize a large PMD page when the address is not aligned on page boundary. Signed-off-by: Alexander Gordeev Reviewed-by: Vasily Gorbik Signed-off-by: Vasily Gorbik Signed-off-by: Heiko Carstens Signed-off-by: Sasha Levin --- arch/s390/mm/kasan_init.c | 41 +++++++++++++++++++-------------------- 1 file changed, 20 insertions(+), 21 deletions(-) diff --git a/arch/s390/mm/kasan_init.c b/arch/s390/mm/kasan_init.c index db4d303aaaa9..d7fcfe97d168 100644 --- a/arch/s390/mm/kasan_init.c +++ b/arch/s390/mm/kasan_init.c @@ -108,6 +108,9 @@ static void __init kasan_early_pgtable_populate(unsigned long address, sgt_prot &= ~_SEGMENT_ENTRY_NOEXEC; } + /* + * The first 1MB of 1:1 mapping is mapped with 4KB pages + */ while (address < end) { pg_dir = pgd_offset_k(address); if (pgd_none(*pg_dir)) { @@ -158,30 +161,26 @@ static void __init kasan_early_pgtable_populate(unsigned long address, pm_dir = pmd_offset(pu_dir, address); if (pmd_none(*pm_dir)) { - if (mode == POPULATE_ZERO_SHADOW && - IS_ALIGNED(address, PMD_SIZE) && + if (IS_ALIGNED(address, PMD_SIZE) && end - address >= PMD_SIZE) { - pmd_populate(&init_mm, pm_dir, - kasan_early_shadow_pte); - address = (address + PMD_SIZE) & PMD_MASK; - continue; - } - /* the first megabyte of 1:1 is mapped with 4k pages */ - if (has_edat && address && end - address >= PMD_SIZE && - mode != POPULATE_ZERO_SHADOW) { - void *page; - - if (mode == POPULATE_ONE2ONE) { - page = (void *)address; - } else { - page = kasan_early_alloc_segment(); - memset(page, 0, _SEGMENT_SIZE); + if (mode == POPULATE_ZERO_SHADOW) { + pmd_populate(&init_mm, pm_dir, kasan_early_shadow_pte); + address = (address + PMD_SIZE) & PMD_MASK; + continue; + } else if (has_edat && address) { + void *page; + + if (mode == POPULATE_ONE2ONE) { + page = (void *)address; + } else { + page = kasan_early_alloc_segment(); + memset(page, 0, _SEGMENT_SIZE); + } + pmd_val(*pm_dir) = __pa(page) | sgt_prot; + address = (address + PMD_SIZE) & PMD_MASK; + continue; } - pmd_val(*pm_dir) = __pa(page) | sgt_prot; - address = (address + PMD_SIZE) & PMD_MASK; - continue; } - pt_dir = kasan_early_pte_alloc(); pmd_populate(&init_mm, pm_dir, pt_dir); } else if (pmd_large(*pm_dir)) { -- 2.30.2