linux-kernel - [PATCH] kernel/module.c: Mark module state before set RO and NX regions

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Date:	Tue,  6 Jan 2015 18:07:36 +0900
From:	Jungseung Lee <js07.lee@...il.com>
To:	Rusty Russell <rusty@...tcorp.com.au>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Catalin Marinas <catalin.marinas@....com>,
	Russell King <rmk+kernel@....linux.org.uk>,
	Laura Abbott <lauraa@...eaurora.org>,
	Will Deacon <will.deacon@....com>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Jungseung Lee <js07.lee@...il.com>
Subject: [PATCH] kernel/module.c: Mark module state before set RO and NX regions

In some architectures like arm/arm64, set_memory_*() check module address
and state as well. Mark module state before set RO and NX regions for
the routine is passed.

It will fix wrong RO/NX protection for loadable kernel modules on arm/arm64.

Signed-off-by: Jungseung Lee <js07.lee@...il.com>
---
 kernel/module.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/kernel/module.c b/kernel/module.c
index 3965511..7e7cc9f 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -3152,6 +3152,10 @@ static int complete_formation(struct module *mod, struct load_info *info)
 	/* This relies on module_mutex for list integrity. */
 	module_bug_finalize(info->hdr, info->sechdrs, mod);
 
+	/* Mark state as coming so strong_try_module_get() ignores us,
+	 * but kallsyms etc. can see us. */
+	mod->state = MODULE_STATE_COMING;
+
 	/* Set RO and NX regions for core */
 	set_section_ro_nx(mod->module_core,
 				mod->core_text_size,
@@ -3164,9 +3168,6 @@ static int complete_formation(struct module *mod, struct load_info *info)
 				mod->init_ro_size,
 				mod->init_size);
 
-	/* Mark state as coming so strong_try_module_get() ignores us,
-	 * but kallsyms etc. can see us. */
-	mod->state = MODULE_STATE_COMING;
 	mutex_unlock(&module_mutex);
 
 	blocking_notifier_call_chain(&module_notify_list,
-- 
1.9.1

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