linux-kernel - [PATCH modules-next] module: tracking: Keep a record of tainted unloaded modules only

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Message-Id: <20221007133812.804837-1-atomlin@redhat.com>
Date:   Fri,  7 Oct 2022 14:38:12 +0100
From:   Aaron Tomlin <atomlin@...hat.com>
To:     mcgrof@...nel.org
Cc:     adobriyan@...il.com, linux-kernel@...r.kernel.org,
        linux-modules@...r.kernel.org, atomlin@...mlin.com
Subject: [PATCH modules-next] module: tracking: Keep a record of tainted unloaded modules only

This patch ensures that no module record/or entry is added to the
unloaded_tainted_modules list if it does not carry a taint.

Reported-by: Alexey Dobriyan <adobriyan@...il.com>
Fixes: 99bd9956551b ("module: Introduce module unload taint tracking")

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

diff --git a/kernel/module/tracking.c b/kernel/module/tracking.c
index a139e63b6f20..26d812e07615 100644
--- a/kernel/module/tracking.c
+++ b/kernel/module/tracking.c
@@ -22,6 +22,9 @@ int try_add_tainted_module(struct module *mod)
 
 	module_assert_mutex_or_preempt();
 
+	if (!mod->taints)
+		goto out;
+
 	list_for_each_entry_rcu(mod_taint, &unloaded_tainted_modules, list,
 				lockdep_is_held(&module_mutex)) {
 		if (!strcmp(mod_taint->name, mod->name) &&
-- 
2.37.3