From patchwork Thu Sep 30 07:11:38 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kefeng Wang X-Patchwork-Id: 12527487 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 41F2DC43217 for ; Thu, 30 Sep 2021 07:09:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3051A61989 for ; Thu, 30 Sep 2021 07:09:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1348617AbhI3HLS (ORCPT ); Thu, 30 Sep 2021 03:11:18 -0400 Received: from szxga02-in.huawei.com ([45.249.212.188]:13861 "EHLO szxga02-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1348529AbhI3HLE (ORCPT ); Thu, 30 Sep 2021 03:11:04 -0400 Received: from dggemv711-chm.china.huawei.com (unknown [172.30.72.53]) by szxga02-in.huawei.com (SkyGuard) with ESMTP id 4HKkkt5J6Bz8yyF; Thu, 30 Sep 2021 15:04:38 +0800 (CST) Received: from dggpemm500001.china.huawei.com (7.185.36.107) by dggemv711-chm.china.huawei.com (10.1.198.66) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2308.8; Thu, 30 Sep 2021 15:09:17 +0800 Received: from localhost.localdomain.localdomain (10.175.113.25) by dggpemm500001.china.huawei.com (7.185.36.107) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2308.8; Thu, 30 Sep 2021 15:09:17 +0800 From: Kefeng Wang To: , , , , , , , , , CC: , , , , , Christophe Leroy , Kefeng Wang Subject: [PATCH v4 06/11] sections: Provide internal __is_kernel() and __is_kernel_text() helper Date: Thu, 30 Sep 2021 15:11:38 +0800 Message-ID: <20210930071143.63410-7-wangkefeng.wang@huawei.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20210930071143.63410-1-wangkefeng.wang@huawei.com> References: <20210930071143.63410-1-wangkefeng.wang@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.175.113.25] X-ClientProxiedBy: dggems706-chm.china.huawei.com (10.3.19.183) To dggpemm500001.china.huawei.com (7.185.36.107) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org An internal __is_kernel() helper which only check the kernel address ranges, and an internal __is_kernel_text() helper which only check text section ranges. Signed-off-by: Kefeng Wang --- include/asm-generic/sections.h | 29 +++++++++++++++++++++++++++++ include/linux/kallsyms.h | 4 ++-- 2 files changed, 31 insertions(+), 2 deletions(-) diff --git a/include/asm-generic/sections.h b/include/asm-generic/sections.h index 811583ca8bd0..a7abeadddc7a 100644 --- a/include/asm-generic/sections.h +++ b/include/asm-generic/sections.h @@ -186,4 +186,33 @@ static inline bool is_kernel_inittext(unsigned long addr) addr < (unsigned long)_einittext; } +/** + * __is_kernel_text - checks if the pointer address is located in the + * .text section + * + * @addr: address to check + * + * Returns: true if the address is located in .text, false otherwise. + * Note: an internal helper, only check the range of _stext to _etext. + */ +static inline bool __is_kernel_text(unsigned long addr) +{ + return addr >= (unsigned long)_stext && + addr < (unsigned long)_etext; +} + +/** + * __is_kernel - checks if the pointer address is located in the kernel range + * + * @addr: address to check + * + * Returns: true if the address is located in the kernel range, false otherwise. + * Note: an internal helper, only check the range of _stext to _end. + */ +static inline bool __is_kernel(unsigned long addr) +{ + return addr >= (unsigned long)_stext && + addr < (unsigned long)_end; +} + #endif /* _ASM_GENERIC_SECTIONS_H_ */ diff --git a/include/linux/kallsyms.h b/include/linux/kallsyms.h index 8a9d329c927c..5fb17dd4b6fa 100644 --- a/include/linux/kallsyms.h +++ b/include/linux/kallsyms.h @@ -26,14 +26,14 @@ struct module; static inline int is_kernel_text(unsigned long addr) { - if ((addr >= (unsigned long)_stext && addr < (unsigned long)_etext)) + if (__is_kernel_text(addr)) return 1; return in_gate_area_no_mm(addr); } static inline int is_kernel(unsigned long addr) { - if (addr >= (unsigned long)_stext && addr < (unsigned long)_end) + if (__is_kernel(addr)) return 1; return in_gate_area_no_mm(addr); }