This option allows to disable modsign completely at the beginning,
and turn off by set the kernel cmdline `no_modsig_enforce` when
`CONFIG_MODULE_SIG_FORCE` is enabled.
Yet another change allows to always show the current status of
modsign through `/sys/module/module/parameters/sig_enforce`.
Signed-off-by: Jia Zhang <zhang.jia@xxxxxxxxxxxxxxxxx>
Signed-off-by: Tianjia Zhang <tianjia.zhang@xxxxxxxxxxxxxxxxx>
---
Documentation/admin-guide/kernel-parameters.txt | 6 ++++++
kernel/module.c | 8 ++++++++
2 files changed, 14 insertions(+)
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 7bc83f3d9bdf..00ed7566959f 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -3190,6 +3190,12 @@
noirqdebug [X86-32] Disables the code which attempts to detect and
disable unhandled interrupt sources.
+ no_modsig_enforce
+ [KNL] When CONFIG_MODULE_SIG_FORCE is set, this option
+ allows to disable modsign completely at the beginning.
+ This means that modules without (valid) signatures will
+ success to load.
+
no_timer_check [X86,APIC] Disables the code which tests for
broken timer IRQ sources.
diff --git a/kernel/module.c b/kernel/module.c
index 646f1e2330d2..0e68e1286377 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -269,6 +269,14 @@ static void module_assert_mutex_or_preempt(void)
static bool sig_enforce = IS_ENABLED(CONFIG_MODULE_SIG_FORCE);
module_param(sig_enforce, bool_enable_only, 0644);
+#ifdef CONFIG_MODULE_SIG_FORCE
+static int __init set_no_modsig_enforce(char *str)
+{
+ sig_enforce = false;
+ return 1;
+}
+__setup("no_modsig_enforce", set_no_modsig_enforce);
+#endif /* !CONFIG_MODULE_SIG_FORCE */
/*
* Export sig_enforce kernel cmdline parameter to allow other subsystems rely
--
2.17.1
