From: Mimi Zohar <zohar@xxxxxxxxxxxxx>
[ Upstream commit 0c18f29aae7ce3dadd26d8ee3505d07cc982df75 ]
Irrespective as to whether CONFIG_MODULE_SIG is configured, specifying
"module.sig_enforce=1" on the boot command line sets "sig_enforce".
Only allow "sig_enforce" to be set when CONFIG_MODULE_SIG is configured.
This patch makes the presence of /sys/module/module/parameters/sig_enforce
dependent on CONFIG_MODULE_SIG=y.
Fixes: fda784e50aac ("module: export module signature enforcement status")
Reported-by: Nayna Jain <nayna@xxxxxxxxxxxxx>
Tested-by: Mimi Zohar <zohar@xxxxxxxxxxxxx>
Tested-by: Jessica Yu <jeyu@xxxxxxxxxx>
Signed-off-by: Mimi Zohar <zohar@xxxxxxxxxxxxx>
Signed-off-by: Jessica Yu <jeyu@xxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
kernel/module.c | 14 +++++++++-----
1 file changed, 9 insertions(+), 5 deletions(-)
diff --git a/kernel/module.c b/kernel/module.c
index 908d46abe165..185b2655bc20 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -272,9 +272,18 @@ static void module_assert_mutex_or_preempt(void)
#endif
}
+#ifdef CONFIG_MODULE_SIG
static bool sig_enforce = IS_ENABLED(CONFIG_MODULE_SIG_FORCE);
module_param(sig_enforce, bool_enable_only, 0644);
+void set_module_sig_enforced(void)
+{
+ sig_enforce = true;
+}
+#else
+#define sig_enforce false
+#endif
+
/*
* Export sig_enforce kernel cmdline parameter to allow other subsystems rely
* on that instead of directly to CONFIG_MODULE_SIG_FORCE config.
@@ -285,11 +294,6 @@ bool is_module_sig_enforced(void)
}
EXPORT_SYMBOL(is_module_sig_enforced);
-void set_module_sig_enforced(void)
-{
- sig_enforce = true;
-}
-
/* Block module loading/unloading? */
int modules_disabled = 0;
core_param(nomodule, modules_disabled, bint, 0);
--
2.30.2
