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{
    "id": 806906,
    "url": "http://patchwork.ozlabs.org/api/patches/806906/?format=api",
    "web_url": "http://patchwork.ozlabs.org/project/sparclinux/patch/1503972142-289376-11-git-send-email-pasha.tatashin@oracle.com/",
    "project": {
        "id": 10,
        "url": "http://patchwork.ozlabs.org/api/projects/10/?format=api",
        "name": "Linux SPARC Development ",
        "link_name": "sparclinux",
        "list_id": "sparclinux.vger.kernel.org",
        "list_email": "sparclinux@vger.kernel.org",
        "web_url": null,
        "scm_url": null,
        "webscm_url": null,
        "list_archive_url": "",
        "list_archive_url_format": "",
        "commit_url_format": ""
    },
    "msgid": "<1503972142-289376-11-git-send-email-pasha.tatashin@oracle.com>",
    "list_archive_url": null,
    "date": "2017-08-29T02:02:21",
    "name": "[v7,10/11] arm64/kasan: explicitly zero kasan shadow memory",
    "commit_ref": null,
    "pull_url": null,
    "state": "not-applicable",
    "archived": false,
    "hash": "4a7d07044b8da9c612c9f9679ff9897cfada769a",
    "submitter": {
        "id": 71010,
        "url": "http://patchwork.ozlabs.org/api/people/71010/?format=api",
        "name": "Pavel Tatashin",
        "email": "pasha.tatashin@oracle.com"
    },
    "delegate": {
        "id": 34,
        "url": "http://patchwork.ozlabs.org/api/users/34/?format=api",
        "username": "davem",
        "first_name": "David",
        "last_name": "Miller",
        "email": "davem@davemloft.net"
    },
    "mbox": "http://patchwork.ozlabs.org/project/sparclinux/patch/1503972142-289376-11-git-send-email-pasha.tatashin@oracle.com/mbox/",
    "series": [
        {
            "id": 285,
            "url": "http://patchwork.ozlabs.org/api/series/285/?format=api",
            "web_url": "http://patchwork.ozlabs.org/project/sparclinux/list/?series=285",
            "date": "2017-08-29T02:02:11",
            "name": "complete deferred page initialization",
            "version": 7,
            "mbox": "http://patchwork.ozlabs.org/series/285/mbox/"
        }
    ],
    "comments": "http://patchwork.ozlabs.org/api/patches/806906/comments/",
    "check": "pending",
    "checks": "http://patchwork.ozlabs.org/api/patches/806906/checks/",
    "tags": {},
    "related": [],
    "headers": {
        "Return-Path": "<sparclinux-owner@vger.kernel.org>",
        "X-Original-To": "patchwork-incoming@ozlabs.org",
        "Delivered-To": "patchwork-incoming@ozlabs.org",
        "Authentication-Results": "ozlabs.org;\n\tspf=none (mailfrom) smtp.mailfrom=vger.kernel.org\n\t(client-ip=209.132.180.67; helo=vger.kernel.org;\n\tenvelope-from=sparclinux-owner@vger.kernel.org;\n\treceiver=<UNKNOWN>)",
        "Received": [
            "from vger.kernel.org (vger.kernel.org [209.132.180.67])\n\tby ozlabs.org (Postfix) with ESMTP id 3xhBnd4VyGz9sRV\n\tfor <patchwork-incoming@ozlabs.org>;\n\tTue, 29 Aug 2017 12:06:13 +1000 (AEST)",
            "(majordomo@vger.kernel.org) by vger.kernel.org via listexpand\n\tid S1751286AbdH2CDw (ORCPT <rfc822;patchwork-incoming@ozlabs.org>);\n\tMon, 28 Aug 2017 22:03:52 -0400",
            "from aserp1040.oracle.com ([141.146.126.69]:25864 \"EHLO\n\taserp1040.oracle.com\" rhost-flags-OK-OK-OK-OK) by vger.kernel.org\n\twith ESMTP id S1751237AbdH2CDu (ORCPT\n\t<rfc822; sparclinux@vger.kernel.org>); Mon, 28 Aug 2017 22:03:50 -0400",
            "from userv0022.oracle.com (userv0022.oracle.com [156.151.31.74])\n\tby aserp1040.oracle.com (Sentrion-MTA-4.3.2/Sentrion-MTA-4.3.2) with\n\tESMTP id v7T22enm011093\n\t(version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256\n\tverify=OK); Tue, 29 Aug 2017 02:02:41 GMT",
            "from userv0122.oracle.com (userv0122.oracle.com [156.151.31.75])\n\tby userv0022.oracle.com (8.14.4/8.14.4) with ESMTP id v7T22e0J005404\n\t(version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256\n\tverify=OK); Tue, 29 Aug 2017 02:02:40 GMT",
            "from abhmp0011.oracle.com (abhmp0011.oracle.com [141.146.116.17])\n\tby userv0122.oracle.com (8.14.4/8.14.4) with ESMTP id\n\tv7T22dYK012178; Tue, 29 Aug 2017 02:02:39 GMT",
            "from ca-ldom-ol-build-1.us.oracle.com (/10.129.68.23)\n\tby default (Oracle Beehive Gateway v4.0)\n\twith ESMTP ; Mon, 28 Aug 2017 19:02:38 -0700"
        ],
        "From": "Pavel Tatashin <pasha.tatashin@oracle.com>",
        "To": "linux-kernel@vger.kernel.org, sparclinux@vger.kernel.org,\n\tlinux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org,\n\tlinux-s390@vger.kernel.org, linux-arm-kernel@lists.infradead.org,\n\tx86@kernel.org, kasan-dev@googlegroups.com, borntraeger@de.ibm.com,\n\theiko.carstens@de.ibm.com, davem@davemloft.net,\n\twilly@infradead.org, mhocko@kernel.org, ard.biesheuvel@linaro.org,\n\twill.deacon@arm.com, catalin.marinas@arm.com, sam@ravnborg.org,\n\tmgorman@techsingularity.net, Steven.Sistare@oracle.com,\n\tdaniel.m.jordan@oracle.com, bob.picco@oracle.com",
        "Subject": "[PATCH v7 10/11] arm64/kasan: explicitly zero kasan shadow memory",
        "Date": "Mon, 28 Aug 2017 22:02:21 -0400",
        "Message-Id": "<1503972142-289376-11-git-send-email-pasha.tatashin@oracle.com>",
        "X-Mailer": "git-send-email 1.7.1",
        "In-Reply-To": "<1503972142-289376-1-git-send-email-pasha.tatashin@oracle.com>",
        "References": "<1503972142-289376-1-git-send-email-pasha.tatashin@oracle.com>",
        "X-Source-IP": "userv0022.oracle.com [156.151.31.74]",
        "Sender": "sparclinux-owner@vger.kernel.org",
        "Precedence": "bulk",
        "List-ID": "<sparclinux.vger.kernel.org>",
        "X-Mailing-List": "sparclinux@vger.kernel.org"
    },
    "content": "To optimize the performance of struct page initialization,\nvmemmap_populate() will no longer zero memory.\n\nWe must explicitly zero the memory that is allocated by vmemmap_populate()\nfor kasan, as this memory does not go through struct page initialization\npath.\n\nSigned-off-by: Pavel Tatashin <pasha.tatashin@oracle.com>\nReviewed-by: Steven Sistare <steven.sistare@oracle.com>\nReviewed-by: Daniel Jordan <daniel.m.jordan@oracle.com>\nReviewed-by: Bob Picco <bob.picco@oracle.com>\n---\n arch/arm64/mm/kasan_init.c | 42 ++++++++++++++++++++++++++++++++++++++++++\n 1 file changed, 42 insertions(+)",
    "diff": "diff --git a/arch/arm64/mm/kasan_init.c b/arch/arm64/mm/kasan_init.c\nindex 81f03959a4ab..e78a9ecbb687 100644\n--- a/arch/arm64/mm/kasan_init.c\n+++ b/arch/arm64/mm/kasan_init.c\n@@ -135,6 +135,41 @@ static void __init clear_pgds(unsigned long start,\n \t\tset_pgd(pgd_offset_k(start), __pgd(0));\n }\n \n+/*\n+ * Memory that was allocated by vmemmap_populate is not zeroed, so we must\n+ * zero it here explicitly.\n+ */\n+static void\n+zero_vmemmap_populated_memory(void)\n+{\n+\tstruct memblock_region *reg;\n+\tu64 start, end;\n+\n+\tfor_each_memblock(memory, reg) {\n+\t\tstart = __phys_to_virt(reg->base);\n+\t\tend = __phys_to_virt(reg->base + reg->size);\n+\n+\t\tif (start >= end)\n+\t\t\tbreak;\n+\n+\t\tstart = (u64)kasan_mem_to_shadow((void *)start);\n+\t\tend = (u64)kasan_mem_to_shadow((void *)end);\n+\n+\t\t/* Round to the start end of the mapped pages */\n+\t\tstart = round_down(start, SWAPPER_BLOCK_SIZE);\n+\t\tend = round_up(end, SWAPPER_BLOCK_SIZE);\n+\t\tmemset((void *)start, 0, end - start);\n+\t}\n+\n+\tstart = (u64)kasan_mem_to_shadow(_text);\n+\tend = (u64)kasan_mem_to_shadow(_end);\n+\n+\t/* Round to the start end of the mapped pages */\n+\tstart = round_down(start, SWAPPER_BLOCK_SIZE);\n+\tend = round_up(end, SWAPPER_BLOCK_SIZE);\n+\tmemset((void *)start, 0, end - start);\n+}\n+\n void __init kasan_init(void)\n {\n \tu64 kimg_shadow_start, kimg_shadow_end;\n@@ -205,8 +240,15 @@ void __init kasan_init(void)\n \t\t\tpfn_pte(sym_to_pfn(kasan_zero_page), PAGE_KERNEL_RO));\n \n \tmemset(kasan_zero_page, 0, PAGE_SIZE);\n+\n \tcpu_replace_ttbr1(lm_alias(swapper_pg_dir));\n \n+\t/*\n+\t * vmemmap_populate does not zero the memory, so we need to zero it\n+\t * explicitly\n+\t */\n+\tzero_vmemmap_populated_memory();\n+\n \t/* At this point kasan is fully initialized. Enable error messages */\n \tinit_task.kasan_depth = 0;\n \tpr_info(\"KernelAddressSanitizer initialized\\n\");\n",
    "prefixes": [
        "v7",
        "10/11"
    ]
}