linux-kernel - [RFC PATCH v2 2/2] module: When modifying a module's text ignore modules which are going away too

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Message-Id: <1477560966-781-1-git-send-email-atomlin@redhat.com>
Date:   Thu, 27 Oct 2016 10:36:06 +0100
From:   Aaron Tomlin <atomlin@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     rusty@...tcorp.com.au, rostedt@...dmis.org
Subject: [RFC PATCH v2 2/2] module: When modifying a module's text ignore modules which are going away too

By default, during the access permission modification of a module's core
and init pages, we only ignore modules that are malformed. Albeit for a
module which is going away, it does not make sense to change its text to
RO since the module should be RW, before deallocation.

This patch makes set_all_modules_text_ro() skip modules which are going
away too.

Signed-off-by: Aaron Tomlin <atomlin@...hat.com>
---
 kernel/module.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/module.c b/kernel/module.c
index ff93ab8..2a383df 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -1969,7 +1969,8 @@ void set_all_modules_text_ro(void)
 
 	mutex_lock(&module_mutex);
 	list_for_each_entry_rcu(mod, &modules, list) {
-		if (mod->state == MODULE_STATE_UNFORMED)
+		if (mod->state == MODULE_STATE_UNFORMED ||
+			mod->state == MODULE_STATE_GOING)
 			continue;
 
 		frob_text(&mod->core_layout, set_memory_ro);
-- 
2.5.5