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Thu, 3 Feb 2022 20:23:25 +0000 From: Christophe Leroy To: "atomlin@redhat.com" , Luis Chamberlain , "linux-modules@vger.kernel.org" CC: Christophe Leroy , "linux-kernel@vger.kernel.org" Subject: [RFC PATCH 1/2] modules: Make module_enable_x() independant of CONFIG_ARCH_HAS_STRICT_MODULE_RWX Thread-Topic: [RFC PATCH 1/2] modules: Make module_enable_x() independant of CONFIG_ARCH_HAS_STRICT_MODULE_RWX Thread-Index: AQHYGTvleFd3jp/x5EiW0RJAl2kmwQ== Date: Thu, 3 Feb 2022 20:23:25 +0000 Message-ID: <203348805c9ac9851d8939d15cb9802ef047b5e2.1643919758.git.christophe.leroy@csgroup.eu> Accept-Language: fr-FR, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=csgroup.eu; x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 736b9568-e706-4348-a219-08d9e7530829 x-ms-traffictypediagnostic: PAZP264MB2814:EE_ x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:8882; 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charset="iso-8859-1" Content-Transfer-Encoding: 8BIT MIME-Version: 1.0 X-OriginatorOrg: csgroup.eu X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: MRZP264MB2988.FRAP264.PROD.OUTLOOK.COM X-MS-Exchange-CrossTenant-Network-Message-Id: 736b9568-e706-4348-a219-08d9e7530829 X-MS-Exchange-CrossTenant-originalarrivaltime: 03 Feb 2022 20:23:25.4102 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 9914def7-b676-4fda-8815-5d49fb3b45c8 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: K+l6xbH+BxZWUWDCIlxx4mTYsWO4Kx2MWwG6UvFWftOyhOQJu1/4EyzmqA6PyAIu8fPNI744fPHZ7MuwSWvTxx0/sXYzn9TquZrGeM0IAN4= X-MS-Exchange-Transport-CrossTenantHeadersStamped: PAZP264MB2814 Precedence: bulk List-ID: module_enable_x() has nothing to do with CONFIG_ARCH_HAS_STRICT_MODULE_RWX allthough by coincidence architectures who need module_enable_x() are selection CONFIG_ARCH_HAS_STRICT_MODULE_RWX. Enable module_enable_x() for everyone everytime. If an architecture already has module text set executable, it's a no-op. Only check end boundary if CONFIG_STRICT_MODULE_RWX is set, and make sure we entirely get the last page when the boundary is not aligned. When CONFIG_STRICT_MODULE_RWX is not selected, it is not a big deal to have the start of data as executable. Signed-off-by: Christophe Leroy --- kernel/module.c | 12 +++++------- 1 file changed, 5 insertions(+), 7 deletions(-) diff --git a/kernel/module.c b/kernel/module.c index 24dab046e16c..44ed39cbbd17 100644 --- a/kernel/module.c +++ b/kernel/module.c @@ -70,9 +70,9 @@ /* * Modules' sections will be aligned on page boundaries * to ensure complete separation of code and data, but - * only when CONFIG_ARCH_HAS_STRICT_MODULE_RWX=y + * only when CONFIG_STRICT_MODULE_RWX=y */ -#ifdef CONFIG_ARCH_HAS_STRICT_MODULE_RWX +#ifdef CONFIG_STRICT_MODULE_RWX # define debug_align(X) ALIGN(X, PAGE_SIZE) #else # define debug_align(X) (X) @@ -1955,14 +1955,15 @@ static void mod_sysfs_teardown(struct module *mod) * CONFIG_STRICT_MODULE_RWX block below because they are needed regardless of * whether we are strict. */ -#ifdef CONFIG_ARCH_HAS_STRICT_MODULE_RWX static void frob_text(const struct module_layout *layout, int (*set_memory)(unsigned long start, int num_pages)) { BUG_ON((unsigned long)layout->base & (PAGE_SIZE-1)); +#ifdef CONFIG_STRICT_MODULE_RWX BUG_ON((unsigned long)layout->text_size & (PAGE_SIZE-1)); +#endif set_memory((unsigned long)layout->base, - layout->text_size >> PAGE_SHIFT); + ((layout->text_size - 1) >> PAGE_SHIFT) + 1); } static void module_enable_x(const struct module *mod) @@ -1970,9 +1971,6 @@ static void module_enable_x(const struct module *mod) frob_text(&mod->core_layout, set_memory_x); frob_text(&mod->init_layout, set_memory_x); } -#else /* !CONFIG_ARCH_HAS_STRICT_MODULE_RWX */ -static void module_enable_x(const struct module *mod) { } -#endif /* CONFIG_ARCH_HAS_STRICT_MODULE_RWX */ #ifdef CONFIG_STRICT_MODULE_RWX static void frob_rodata(const struct module_layout *layout, -- 2.33.1