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GET /api/patches/806902/?format=api
{ "id": 806902, "url": "http://patchwork.ozlabs.org/api/patches/806902/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/1503972142-289376-11-git-send-email-pasha.tatashin@oracle.com/", "project": { "id": 2, "url": "http://patchwork.ozlabs.org/api/projects/2/?format=api", "name": "Linux PPC development", "link_name": "linuxppc-dev", "list_id": "linuxppc-dev.lists.ozlabs.org", "list_email": "linuxppc-dev@lists.ozlabs.org", "web_url": "https://github.com/linuxppc/wiki/wiki", "scm_url": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git", "webscm_url": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/", "list_archive_url": "https://lore.kernel.org/linuxppc-dev/", "list_archive_url_format": "https://lore.kernel.org/linuxppc-dev/{}/", "commit_url_format": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?id={}" }, "msgid": "<1503972142-289376-11-git-send-email-pasha.tatashin@oracle.com>", "list_archive_url": "https://lore.kernel.org/linuxppc-dev/1503972142-289376-11-git-send-email-pasha.tatashin@oracle.com/", "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": null, "mbox": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/1503972142-289376-11-git-send-email-pasha.tatashin@oracle.com/mbox/", "series": [ { "id": 286, "url": "http://patchwork.ozlabs.org/api/series/286/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=286", "date": "2017-08-29T02:02:21", "name": "complete deferred page initialization", "version": 7, "mbox": "http://patchwork.ozlabs.org/series/286/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/806902/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/806902/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org>", "X-Original-To": [ "patchwork-incoming@ozlabs.org", "linuxppc-dev@lists.ozlabs.org" ], "Delivered-To": [ "patchwork-incoming@ozlabs.org", "linuxppc-dev@lists.ozlabs.org" ], "Received": [ "from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3])\n\t(using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby ozlabs.org (Postfix) with ESMTPS id 3xhBmp2KLgz9s7c\n\tfor <patchwork-incoming@ozlabs.org>;\n\tTue, 29 Aug 2017 12:05:30 +1000 (AEST)", "from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3])\n\tby lists.ozlabs.org (Postfix) with ESMTP id 3xhBmp0ScyzDqNY\n\tfor <patchwork-incoming@ozlabs.org>;\n\tTue, 29 Aug 2017 12:05:30 +1000 (AEST)", "from aserp1040.oracle.com (aserp1040.oracle.com [141.146.126.69])\n\t(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256\n\tbits)) (No client certificate requested)\n\tby lists.ozlabs.org (Postfix) with ESMTPS id 3xhBkg0Xk8zDqKl\n\tfor <linuxppc-dev@lists.ozlabs.org>;\n\tTue, 29 Aug 2017 12:03:38 +1000 (AEST)", "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, willy@infradead.org, \n\tmhocko@kernel.org, ard.biesheuvel@linaro.org, will.deacon@arm.com,\n\tcatalin.marinas@arm.com, sam@ravnborg.org, mgorman@techsingularity.net,\n\tSteven.Sistare@oracle.com, daniel.m.jordan@oracle.com,\n\tbob.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]", "X-BeenThere": "linuxppc-dev@lists.ozlabs.org", "X-Mailman-Version": "2.1.23", "Precedence": "list", "List-Id": "Linux on PowerPC Developers Mail List\n\t<linuxppc-dev.lists.ozlabs.org>", "List-Unsubscribe": "<https://lists.ozlabs.org/options/linuxppc-dev>,\n\t<mailto:linuxppc-dev-request@lists.ozlabs.org?subject=unsubscribe>", "List-Archive": "<http://lists.ozlabs.org/pipermail/linuxppc-dev/>", "List-Post": "<mailto:linuxppc-dev@lists.ozlabs.org>", "List-Help": "<mailto:linuxppc-dev-request@lists.ozlabs.org?subject=help>", "List-Subscribe": "<https://lists.ozlabs.org/listinfo/linuxppc-dev>,\n\t<mailto:linuxppc-dev-request@lists.ozlabs.org?subject=subscribe>", "Errors-To": "linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org", "Sender": "\"Linuxppc-dev\"\n\t<linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.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" ] }