From patchwork Mon Aug 7 20:38:45 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pavel Tatashin X-Patchwork-Id: 9886199 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 5D56D602CC for ; Mon, 7 Aug 2017 20:48:35 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 4F0F728709 for ; Mon, 7 Aug 2017 20:48:35 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 43B7B28708; Mon, 7 Aug 2017 20:48:35 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.9 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, RCVD_IN_DNSWL_NONE, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [65.50.211.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id C5A0F286F6 for ; Mon, 7 Aug 2017 20:48:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:List-Subscribe:List-Help: List-Post:List-Archive:List-Unsubscribe:List-Id:References:In-Reply-To: Message-Id:Date:Subject:To:From:Reply-To:Cc:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=u79ZXT4z/40FPrYWqAqSqOvSEmUJnZKraN7tpGhfOeM=; b=GJjdBiLNPanEO0 sJr822CjLSmyg8qwEqX5nAM0z/kjdnOCs4UxvauwkpymSC979gfxCh7dbI423gVsfZIkgLOxIAjYA 6lVVVam7i7LUue+eV8XRvha/5fwZ0otIxQ0PqA3X1qxO4HQNUGDFB/Kxu3w+jwAtbz3NK/HfqSpMi 8cTMiOdRQWVbKQ/UM3BdPI7PvqTNzs5vr++E98tHj5/fKgNytNWhio9B2sQMYhGAaSd0I3YPCRY/F lEXsmez+YEuKXxniUidD2pPxaqSI/zV0AvoLPoJwih8I2EB2RUgOnSrm3ubGr01m3kh3coDMNnKjh RSR1sqFNuxD8xRdAYbAg==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux)) id 1deowr-00042w-WD; Mon, 07 Aug 2017 20:48:26 +0000 Received: from aserp1040.oracle.com ([141.146.126.69]) by bombadil.infradead.org with esmtps (Exim 4.87 #1 (Red Hat Linux)) id 1deoop-00043v-JY for linux-arm-kernel@lists.infradead.org; Mon, 07 Aug 2017 20:40:14 +0000 Received: from userv0021.oracle.com (userv0021.oracle.com [156.151.31.71]) by aserp1040.oracle.com (Sentrion-MTA-4.3.2/Sentrion-MTA-4.3.2) with ESMTP id v77Kd6lq007009 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 7 Aug 2017 20:39:06 GMT Received: from userv0122.oracle.com (userv0122.oracle.com [156.151.31.75]) by userv0021.oracle.com (8.14.4/8.14.4) with ESMTP id v77Kd68f032325 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 7 Aug 2017 20:39:06 GMT Received: from abhmp0007.oracle.com (abhmp0007.oracle.com [141.146.116.13]) by userv0122.oracle.com (8.14.4/8.14.4) with ESMTP id v77Kd5nr017242; Mon, 7 Aug 2017 20:39:05 GMT Received: from ca-ldom-ol-build-1.us.oracle.com (/10.129.68.23) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Mon, 07 Aug 2017 13:39:05 -0700 From: Pavel Tatashin To: linux-kernel@vger.kernel.org, sparclinux@vger.kernel.org, linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, linux-arm-kernel@lists.infradead.org, x86@kernel.org, kasan-dev@googlegroups.com, borntraeger@de.ibm.com, heiko.carstens@de.ibm.com, davem@davemloft.net, willy@infradead.org, mhocko@kernel.org, ard.biesheuvel@linaro.org, will.deacon@arm.com, catalin.marinas@arm.com, sam@ravnborg.org Subject: [v6 11/15] arm64/kasan: explicitly zero kasan shadow memory Date: Mon, 7 Aug 2017 16:38:45 -0400 Message-Id: <1502138329-123460-12-git-send-email-pasha.tatashin@oracle.com> X-Mailer: git-send-email 1.7.1 In-Reply-To: <1502138329-123460-1-git-send-email-pasha.tatashin@oracle.com> References: <1502138329-123460-1-git-send-email-pasha.tatashin@oracle.com> X-Source-IP: userv0021.oracle.com [156.151.31.71] X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20170807_134007_760197_677AF336 X-CRM114-Status: GOOD ( 10.50 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP To optimize the performance of struct page initialization, vmemmap_populate() will no longer zero memory. We must explicitly zero the memory that is allocated by vmemmap_populate() for kasan, as this memory does not go through struct page initialization path. Signed-off-by: Pavel Tatashin Reviewed-by: Steven Sistare Reviewed-by: Daniel Jordan Reviewed-by: Bob Picco --- arch/arm64/mm/kasan_init.c | 42 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+) diff --git a/arch/arm64/mm/kasan_init.c b/arch/arm64/mm/kasan_init.c index 81f03959a4ab..e78a9ecbb687 100644 --- a/arch/arm64/mm/kasan_init.c +++ b/arch/arm64/mm/kasan_init.c @@ -135,6 +135,41 @@ static void __init clear_pgds(unsigned long start, set_pgd(pgd_offset_k(start), __pgd(0)); } +/* + * Memory that was allocated by vmemmap_populate is not zeroed, so we must + * zero it here explicitly. + */ +static void +zero_vmemmap_populated_memory(void) +{ + struct memblock_region *reg; + u64 start, end; + + for_each_memblock(memory, reg) { + start = __phys_to_virt(reg->base); + end = __phys_to_virt(reg->base + reg->size); + + if (start >= end) + break; + + start = (u64)kasan_mem_to_shadow((void *)start); + end = (u64)kasan_mem_to_shadow((void *)end); + + /* Round to the start end of the mapped pages */ + start = round_down(start, SWAPPER_BLOCK_SIZE); + end = round_up(end, SWAPPER_BLOCK_SIZE); + memset((void *)start, 0, end - start); + } + + start = (u64)kasan_mem_to_shadow(_text); + end = (u64)kasan_mem_to_shadow(_end); + + /* Round to the start end of the mapped pages */ + start = round_down(start, SWAPPER_BLOCK_SIZE); + end = round_up(end, SWAPPER_BLOCK_SIZE); + memset((void *)start, 0, end - start); +} + void __init kasan_init(void) { u64 kimg_shadow_start, kimg_shadow_end; @@ -205,8 +240,15 @@ void __init kasan_init(void) pfn_pte(sym_to_pfn(kasan_zero_page), PAGE_KERNEL_RO)); memset(kasan_zero_page, 0, PAGE_SIZE); + cpu_replace_ttbr1(lm_alias(swapper_pg_dir)); + /* + * vmemmap_populate does not zero the memory, so we need to zero it + * explicitly + */ + zero_vmemmap_populated_memory(); + /* At this point kasan is fully initialized. Enable error messages */ init_task.kasan_depth = 0; pr_info("KernelAddressSanitizer initialized\n");