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GET /api/patches/816493/?format=api
{ "id": 816493, "url": "http://patchwork.ozlabs.org/api/patches/816493/?format=api", "web_url": "http://patchwork.ozlabs.org/project/netdev/patch/1505940337-79069-9-git-send-email-keescook@chromium.org/", "project": { "id": 7, "url": "http://patchwork.ozlabs.org/api/projects/7/?format=api", "name": "Linux network development", "link_name": "netdev", "list_id": "netdev.vger.kernel.org", "list_email": "netdev@vger.kernel.org", "web_url": null, "scm_url": null, "webscm_url": null, "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<1505940337-79069-9-git-send-email-keescook@chromium.org>", "list_archive_url": null, "date": "2017-09-20T20:45:14", "name": "[v3,08/31] ext2: Define usercopy region in ext2_inode_cache slab cache", "commit_ref": null, "pull_url": null, "state": "not-applicable", "archived": true, "hash": "39ab849d028b656d49525ce8a7f946b29dd96394", "submitter": { "id": 10641, "url": "http://patchwork.ozlabs.org/api/people/10641/?format=api", "name": "Kees Cook", "email": "keescook@chromium.org" }, "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/netdev/patch/1505940337-79069-9-git-send-email-keescook@chromium.org/mbox/", "series": [ { "id": 4231, "url": "http://patchwork.ozlabs.org/api/series/4231/?format=api", "web_url": "http://patchwork.ozlabs.org/project/netdev/list/?series=4231", "date": "2017-09-20T20:45:22", "name": "Hardened usercopy whitelisting", "version": 3, "mbox": "http://patchwork.ozlabs.org/series/4231/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/816493/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/816493/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<netdev-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=netdev-owner@vger.kernel.org;\n\treceiver=<UNKNOWN>)", "ozlabs.org; dkim=pass (1024-bit key;\n\tunprotected) header.d=chromium.org header.i=@chromium.org\n\theader.b=\"EoCb4hwO\"; dkim-atps=neutral" ], "Received": [ "from vger.kernel.org (vger.kernel.org [209.132.180.67])\n\tby ozlabs.org (Postfix) with ESMTP id 3xyBhj2xGqz9s83\n\tfor <patchwork-incoming@ozlabs.org>;\n\tThu, 21 Sep 2017 06:50:29 +1000 (AEST)", "(majordomo@vger.kernel.org) by vger.kernel.org via listexpand\n\tid S1751846AbdITUu1 (ORCPT <rfc822;patchwork-incoming@ozlabs.org>);\n\tWed, 20 Sep 2017 16:50:27 -0400", "from mail-pg0-f45.google.com ([74.125.83.45]:55213 \"EHLO\n\tmail-pg0-f45.google.com\" rhost-flags-OK-OK-OK-OK) by vger.kernel.org\n\twith ESMTP id S1751848AbdITUqG (ORCPT\n\t<rfc822;netdev@vger.kernel.org>); Wed, 20 Sep 2017 16:46:06 -0400", "by mail-pg0-f45.google.com with SMTP id c137so2324048pga.11\n\tfor <netdev@vger.kernel.org>; Wed, 20 Sep 2017 13:46:06 -0700 (PDT)", "from www.outflux.net\n\t(173-164-112-133-Oregon.hfc.comcastbusiness.net. [173.164.112.133])\n\tby smtp.gmail.com with ESMTPSA id\n\tg5sm9409966pfe.94.2017.09.20.13.45.58\n\t(version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128);\n\tWed, 20 Sep 2017 13:46:00 -0700 (PDT)" ], "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed;\n\td=chromium.org; s=google;\n\th=from:to:cc:subject:date:message-id:in-reply-to:references;\n\tbh=LvcQspsIR0cZ09igwnjHXzULMGq3Dr6LW9yWsRsqMUs=;\n\tb=EoCb4hwO5OkWUgCqdkj6LdxwhefJQHd/0AAX+/seNjy8OztA6nKzzVA1V8FxnD0t/K\n\tcdCnArv5YRN9C2z0URakmChOLSHkz+FgpNbQhL/2N6TQGHA/YSgXA0PXUrlpybXxuBNm\n\tYofEP/WpFtXAJSGYo6CXfY0cpMhRJf8HtGzkc=", "X-Google-DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed;\n\td=1e100.net; s=20161025;\n\th=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to\n\t:references;\n\tbh=LvcQspsIR0cZ09igwnjHXzULMGq3Dr6LW9yWsRsqMUs=;\n\tb=eikg3z/GfIj/4wqtS7P8jujuXLt4NyYj634I9Q+m/PKfB4glcwOIE5U2BU8HySHiO2\n\ttd1tOkj9YEaz3sqCQdUGzYGFU/2esbhGI4PrLth4YMiUSjysALjftuigTqiELcgYdHVa\n\toIUghgeXFBXhmsRD60WdrbseHk/u+SEa/Paz1gxVyUCE50nYC5MOTlYjwTFrAndkGh6Q\n\tLPNjebgV0sYZac8ClzUpUzMwdBU9dNABCFLMN2We2uOMJwSeckWN77FoRoObKrm72ijT\n\tSQ4vMPR0VRWWx1ZxbdD/uRlNkCE7mAvo3aM9i5Cu+6n0GYxDc1XNU7CQECEKCJQ3ykQk\n\tIovg==", "X-Gm-Message-State": "AHPjjUhrcTyXQuSJXsI3VPgYOIBvD3fTXy2YCdNflyMLxqqrlaca4r5Y\n\tKWDaxVdtL8+F7E5t695h5wy7pg==", "X-Google-Smtp-Source": "AOwi7QBliiflupQIqDjOeU6Guyk7gsp7PfnS+t6H7cX5J1nN7fdMVhelaWdTXOECuREG6yPlGBX29A==", "X-Received": "by 10.101.88.203 with SMTP id e11mr3306923pgu.95.1505940365703; \n\tWed, 20 Sep 2017 13:46:05 -0700 (PDT)", "From": "Kees Cook <keescook@chromium.org>", "To": "linux-kernel@vger.kernel.org", "Cc": "Kees Cook <keescook@chromium.org>,\n\tDavid Windsor <dave@nullcore.net>, Jan Kara <jack@suse.com>,\n\tlinux-ext4@vger.kernel.org, linux-fsdevel@vger.kernel.org,\n\tnetdev@vger.kernel.org, linux-mm@kvack.org,\n\tkernel-hardening@lists.openwall.com", "Subject": "[PATCH v3 08/31] ext2: Define usercopy region in ext2_inode_cache\n\tslab cache", "Date": "Wed, 20 Sep 2017 13:45:14 -0700", "Message-Id": "<1505940337-79069-9-git-send-email-keescook@chromium.org>", "X-Mailer": "git-send-email 2.7.4", "In-Reply-To": "<1505940337-79069-1-git-send-email-keescook@chromium.org>", "References": "<1505940337-79069-1-git-send-email-keescook@chromium.org>", "Sender": "netdev-owner@vger.kernel.org", "Precedence": "bulk", "List-ID": "<netdev.vger.kernel.org>", "X-Mailing-List": "netdev@vger.kernel.org" }, "content": "From: David Windsor <dave@nullcore.net>\n\nThe ext2 symlink pathnames, stored in struct ext2_inode_info.i_data and\ntherefore contained in the ext2_inode_cache slab cache, need to be copied\nto/from userspace.\n\ncache object allocation:\n fs/ext2/super.c:\n ext2_alloc_inode(...):\n struct ext2_inode_info *ei;\n ...\n ei = kmem_cache_alloc(ext2_inode_cachep, GFP_NOFS);\n ...\n return &ei->vfs_inode;\n\n fs/ext2/ext2.h:\n EXT2_I(struct inode *inode):\n return container_of(inode, struct ext2_inode_info, vfs_inode);\n\n fs/ext2/namei.c:\n ext2_symlink(...):\n ...\n inode->i_link = (char *)&EXT2_I(inode)->i_data;\n\nexample usage trace:\n readlink_copy+0x43/0x70\n vfs_readlink+0x62/0x110\n SyS_readlinkat+0x100/0x130\n\n fs/namei.c:\n readlink_copy(..., link):\n ...\n copy_to_user(..., link, len);\n\n (inlined into vfs_readlink)\n generic_readlink(dentry, ...):\n struct inode *inode = d_inode(dentry);\n const char *link = inode->i_link;\n ...\n readlink_copy(..., link);\n\nIn support of usercopy hardening, this patch defines a region in the\next2_inode_cache slab cache in which userspace copy operations are\nallowed.\n\nThis region is known as the slab cache's usercopy region. Slab caches can\nnow check that each copy operation involving cache-managed memory falls\nentirely within the slab's usercopy region.\n\nThis patch is modified from Brad Spengler/PaX Team's PAX_USERCOPY\nwhitelisting code in the last public patch of grsecurity/PaX based on my\nunderstanding of the code. Changes or omissions from the original code are\nmine and don't reflect the original grsecurity/PaX code.\n\nSigned-off-by: David Windsor <dave@nullcore.net>\n[kees: adjust commit log, provide usage trace]\nCc: Jan Kara <jack@suse.com>\nCc: linux-ext4@vger.kernel.org\nSigned-off-by: Kees Cook <keescook@chromium.org>\nAcked-by: Jan Kara <jack@suse.cz>\n---\n fs/ext2/super.c | 12 +++++++-----\n 1 file changed, 7 insertions(+), 5 deletions(-)", "diff": "diff --git a/fs/ext2/super.c b/fs/ext2/super.c\nindex 1458706bd2ec..789c29987b36 100644\n--- a/fs/ext2/super.c\n+++ b/fs/ext2/super.c\n@@ -220,11 +220,13 @@ static void init_once(void *foo)\n \n static int __init init_inodecache(void)\n {\n-\text2_inode_cachep = kmem_cache_create(\"ext2_inode_cache\",\n-\t\t\t\t\t sizeof(struct ext2_inode_info),\n-\t\t\t\t\t 0, (SLAB_RECLAIM_ACCOUNT|\n-\t\t\t\t\t\tSLAB_MEM_SPREAD|SLAB_ACCOUNT),\n-\t\t\t\t\t init_once);\n+\text2_inode_cachep = kmem_cache_create_usercopy(\"ext2_inode_cache\",\n+\t\t\t\tsizeof(struct ext2_inode_info), 0,\n+\t\t\t\t(SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|\n+\t\t\t\t\tSLAB_ACCOUNT),\n+\t\t\t\toffsetof(struct ext2_inode_info, i_data),\n+\t\t\t\tsizeof_field(struct ext2_inode_info, i_data),\n+\t\t\t\tinit_once);\n \tif (ext2_inode_cachep == NULL)\n \t\treturn -ENOMEM;\n \treturn 0;\n", "prefixes": [ "v3", "08/31" ] }