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GET /api/patches/814462/?format=api
{ "id": 814462, "url": "http://patchwork.ozlabs.org/api/patches/814462/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20170916035347.19705-5-sergey.senozhatsky@gmail.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": "<20170916035347.19705-5-sergey.senozhatsky@gmail.com>", "list_archive_url": "https://lore.kernel.org/linuxppc-dev/20170916035347.19705-5-sergey.senozhatsky@gmail.com/", "date": "2017-09-16T03:53:46", "name": "[4/5] parisc64: Add .opd based function descriptor dereference", "commit_ref": null, "pull_url": null, "state": "not-applicable", "archived": false, "hash": "9cdac2dedc09fbd5749d43e684c674a9860c955b", "submitter": { "id": 3905, "url": "http://patchwork.ozlabs.org/api/people/3905/?format=api", "name": "Sergey Senozhatsky", "email": "sergey.senozhatsky@gmail.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20170916035347.19705-5-sergey.senozhatsky@gmail.com/mbox/", "series": [ { "id": 3413, "url": "http://patchwork.ozlabs.org/api/series/3413/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=3413", "date": "2017-09-16T03:53:42", "name": "printk/ia64/ppc64/parisc64: let's deprecate %pF/%pf printk specifiers", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/3413/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/814462/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/814462/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 [103.22.144.68])\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 3xvJdk5Z03z9t16\n\tfor <patchwork-incoming@ozlabs.org>;\n\tSat, 16 Sep 2017 14:07:54 +1000 (AEST)", "from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3])\n\tby lists.ozlabs.org (Postfix) with ESMTP id 3xvJdk4MrtzDrnw\n\tfor <patchwork-incoming@ozlabs.org>;\n\tSat, 16 Sep 2017 14:07:54 +1000 (AEST)", "from mail-pg0-x244.google.com (mail-pg0-x244.google.com\n\t[IPv6:2607:f8b0:400e:c05::244])\n\t(using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128\n\tbits)) (No client certificate requested)\n\tby lists.ozlabs.org (Postfix) with ESMTPS id 3xvJRY4c6JzDrnl\n\tfor <linuxppc-dev@lists.ozlabs.org>;\n\tSat, 16 Sep 2017 13:59:05 +1000 (AEST)", "by mail-pg0-x244.google.com with SMTP id m30so2240752pgn.5\n\tfor <linuxppc-dev@lists.ozlabs.org>;\n\tFri, 15 Sep 2017 20:59:05 -0700 (PDT)", "from localhost.localdomain ([121.137.63.184])\n\tby smtp.gmail.com with ESMTPSA id\n\t76sm4448230pfp.158.2017.09.15.20.58.59\n\t(version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128);\n\tFri, 15 Sep 2017 20:59:03 -0700 (PDT)" ], "Authentication-Results": [ "ozlabs.org;\n\tdkim=fail reason=\"signature verification failed\" (2048-bit key;\n\tunprotected) header.d=gmail.com header.i=@gmail.com\n\theader.b=\"B9yS/sQa\"; 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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=pbzYOzxbOw6DTwzifZOrQKTCkzmMvM1AuZ6bZBhn/8I=;\n\tb=C8tOJskilY8rLhJ6427w8oGV7HAxW/XKh9Ef2mUQYL5kwyKnB4FRJzX5rWBzOtovrN\n\tclrMpmW937eyuZrVeWXH5m9e7LPnMKRsCgdlmh9Hk9XUn31+GXH5ZjwBOy6xOtYdJW6g\n\tYPqhkGug7vF9uXwtpP+YcgRL5Nu4c1X6udLPwFe/DzYrt6ucNlEy0faqr6GRpmgz7cGk\n\t+3w6Fp7mmg3BrfwQ1QDLhykDRklvQRkWC0dxqEhlGuAtlO4zAmE5nuHr9OrJDoAyC8MN\n\tqOedGiRrX/n4seK1QPzThwuM1oRiVtx/EOUAACSOrBcpKx6xaepTvTreXUTvrTzpLTIL\n\t60bw==", "X-Gm-Message-State": "AHPjjUjlLcVxWyvI9v/FnBrGniNbVu8CxHGme0ybU6tk32Zl2UkTHMJH\n\tdNry5p1hLa6eUw==", "X-Google-Smtp-Source": "ADKCNb72JBLpCpXAZRIhvidNNJivAjezU/LFSmdoHpDu8p3KLbsGSzVCVXfc4iL0d9r2cUj11lkcHA==", "X-Received": "by 10.99.126.84 with SMTP id o20mr26925543pgn.293.1505534343684; \n\tFri, 15 Sep 2017 20:59:03 -0700 (PDT)", "From": "Sergey Senozhatsky <sergey.senozhatsky@gmail.com>", "To": "Tony Luck <tony.luck@intel.com>, Fenghua Yu <fenghua.yu@intel.com>,\n\tBenjamin Herrenschmidt <benh@kernel.crashing.org>,\n\tPaul Mackerras <paulus@samba.org>,\n\tMichael Ellerman <mpe@ellerman.id.au>, \n\t\"James E . J . Bottomley\" <jejb@parisc-linux.org>,\n\tHelge Deller <deller@gmx.de>", "Subject": "[PATCH 4/5] parisc64: Add .opd based function descriptor dereference", "Date": "Sat, 16 Sep 2017 12:53:46 +0900", "Message-Id": "<20170916035347.19705-5-sergey.senozhatsky@gmail.com>", "X-Mailer": "git-send-email 2.14.1", "In-Reply-To": "<20170916035347.19705-1-sergey.senozhatsky@gmail.com>", "References": "<20170916035347.19705-1-sergey.senozhatsky@gmail.com>", "X-BeenThere": "linuxppc-dev@lists.ozlabs.org", "X-Mailman-Version": "2.1.24", "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>", "Cc": "Petr Mladek <pmladek@suse.com>, linux-ia64@vger.kernel.org,\n\tlinux-parisc@vger.kernel.org, Alexei Starovoitov <ast@kernel.org>,\n\tSteven Rostedt <rostedt@goodmis.org>, linux-kernel@vger.kernel.org,\n\tSergey Senozhatsky <sergey.senozhatsky@gmail.com>,\n\tJessica Yu <jeyu@kernel.org>, Andrew Morton <akpm@linux-foundation.org>, \n\tlinuxppc-dev@lists.ozlabs.org", "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": "We are moving towards separate kernel and module function descriptor\ndereference callbacks. This patch enables it for parisc64.\n\nFor pointers that belong to the kernel\n- Added __start_opd and __end_opd pointers, to track the kernel\n .opd section address range;\n\n- Added dereference_kernel_function_descriptor(). Now we\n will dereference only function pointers that are within\n [__start_opd, __end_opd];\n\nFor pointers that belong to a module\n- Added dereference_module_function_descriptor() to handle module\n function descriptor dereference. Now we will dereference only\n pointers that are within [module->opd.start, module->opd.end].\n\nSigned-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>\n---\n arch/parisc/boot/compressed/vmlinux.lds.S | 2 ++\n arch/parisc/include/asm/sections.h | 3 +++\n arch/parisc/kernel/module.c | 14 ++++++++++++++\n arch/parisc/kernel/process.c | 10 ++++++++++\n arch/parisc/kernel/vmlinux.lds.S | 2 ++\n 5 files changed, 31 insertions(+)", "diff": "diff --git a/arch/parisc/boot/compressed/vmlinux.lds.S b/arch/parisc/boot/compressed/vmlinux.lds.S\nindex a4ce3314e78e..4ebd4e65524c 100644\n--- a/arch/parisc/boot/compressed/vmlinux.lds.S\n+++ b/arch/parisc/boot/compressed/vmlinux.lds.S\n@@ -29,7 +29,9 @@ SECTIONS\n \t. = ALIGN(16);\n \t/* Linkage tables */\n \t.opd : {\n+\t\t__start_opd = .;\n \t\t*(.opd)\n+\t\t__end_opd = .;\n \t} PROVIDE (__gp = .);\n \t.plt : {\n \t\t*(.plt)\ndiff --git a/arch/parisc/include/asm/sections.h b/arch/parisc/include/asm/sections.h\nindex 9d13c3507ad6..e3cde650b2f9 100644\n--- a/arch/parisc/include/asm/sections.h\n+++ b/arch/parisc/include/asm/sections.h\n@@ -6,7 +6,10 @@\n \n #ifdef CONFIG_64BIT\n #undef dereference_function_descriptor\n+#undef dereference_kernel_function_descriptor\n+\n void *dereference_function_descriptor(void *);\n+void *dereference_kernel_function_descriptor(void *);\n #endif\n \n #endif\ndiff --git a/arch/parisc/kernel/module.c b/arch/parisc/kernel/module.c\nindex f1a76935a314..bc2eae8634fd 100644\n--- a/arch/parisc/kernel/module.c\n+++ b/arch/parisc/kernel/module.c\n@@ -954,3 +954,17 @@ void module_arch_cleanup(struct module *mod)\n {\n \tderegister_unwind_table(mod);\n }\n+\n+#ifdef CONFIG_64BIT\n+unsigned long dereference_module_function_descriptor(struct module *mod,\n+\t\t\t\t\t unsigned long addr)\n+{\n+\tvoid *opd_sz = mod->arch.fdesc_offset +\n+\t\t mod->arch.fdesc_max * sizeof(Elf64_Fdesc);\n+\n+\tif (addr < mod->arch.fdesc_offset || opd_sz < addr)\n+\t\treturn addr;\n+\n+\treturn dereference_function_descriptor(addr);\n+}\n+#endif\ndiff --git a/arch/parisc/kernel/process.c b/arch/parisc/kernel/process.c\nindex 30f92391a93e..f30776bdaa79 100644\n--- a/arch/parisc/kernel/process.c\n+++ b/arch/parisc/kernel/process.c\n@@ -267,6 +267,8 @@ get_wchan(struct task_struct *p)\n }\n \n #ifdef CONFIG_64BIT\n+extern char __start_opd[], __end_opd[];\n+\n void *dereference_function_descriptor(void *ptr)\n {\n \tElf64_Fdesc *desc = ptr;\n@@ -276,6 +278,14 @@ void *dereference_function_descriptor(void *ptr)\n \t\tptr = p;\n \treturn ptr;\n }\n+\n+void *dereference_kernel_function_descriptor(void *ptr)\n+{\n+\tif (ptr < (void *)__start_opd || (void *)__end_opd < ptr)\n+\t\treturn ptr;\n+\n+\treturn dereference_function_descriptor(ptr);\n+}\n #endif\n \n static inline unsigned long brk_rnd(void)\ndiff --git a/arch/parisc/kernel/vmlinux.lds.S b/arch/parisc/kernel/vmlinux.lds.S\nindex ffe2cbf52d1a..ab030895dd1e 100644\n--- a/arch/parisc/kernel/vmlinux.lds.S\n+++ b/arch/parisc/kernel/vmlinux.lds.S\n@@ -99,7 +99,9 @@ SECTIONS\n \t. = ALIGN(16);\n \t/* Linkage tables */\n \t.opd : {\n+\t\t__start_opd = .;\n \t\t*(.opd)\n+\t\t__end_opd = .;\n \t} PROVIDE (__gp = .);\n \t.plt : {\n \t\t*(.plt)\n", "prefixes": [ "4/5" ] }