72 lines
2.1 KiB
Diff
72 lines
2.1 KiB
Diff
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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: "Brett T. Warden" <brett.t.warden@intel.com>
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Date: Mon, 13 Aug 2018 04:01:21 -0500
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Subject: [PATCH] Add boot option to allow unsigned modules
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Add module.sig_unenforce boot parameter to allow loading unsigned kernel
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modules. Parameter is only effective if CONFIG_MODULE_SIG_FORCE is
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enabled and system is *not* SecureBooted.
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Signed-off-by: Brett T. Warden <brett.t.warden@intel.com>
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Signed-off-by: Miguel Bernal Marin <miguel.bernal.marin@linux.intel.com>
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---
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kernel/module.c | 21 +++++++++++++++++++++
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1 file changed, 21 insertions(+)
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diff --git a/kernel/module.c b/kernel/module.c
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index ff2d7359a418..f6368b8f90b6 100644
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--- a/kernel/module.c
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+++ b/kernel/module.c
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@@ -53,6 +53,7 @@
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#include <linux/bsearch.h>
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#include <linux/dynamic_debug.h>
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#include <linux/audit.h>
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+#include <linux/efi.h>
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#include <uapi/linux/module.h>
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#include "module-internal.h"
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@@ -268,6 +269,10 @@ static void module_assert_mutex_or_preempt(void)
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static bool sig_enforce = IS_ENABLED(CONFIG_MODULE_SIG_FORCE);
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module_param(sig_enforce, bool_enable_only, 0644);
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+/* Allow disabling module signature requirement by adding boot param */
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+static bool sig_unenforce = false;
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+module_param(sig_unenforce, bool_enable_only, 0644);
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+
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/*
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* Export sig_enforce kernel cmdline parameter to allow other subsystems rely
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@@ -393,6 +398,8 @@ extern const s32 __start___kcrctab_unused[];
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extern const s32 __start___kcrctab_unused_gpl[];
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#endif
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+extern struct boot_params boot_params;
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+
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#ifndef CONFIG_MODVERSIONS
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#define symversion(base, idx) NULL
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#else
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@@ -4401,6 +4408,20 @@ static const struct file_operations proc_modules_operations = {
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static int __init proc_modules_init(void)
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{
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proc_create("modules", 0, NULL, &proc_modules_operations);
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+
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+#ifdef CONFIG_MODULE_SIG_FORCE
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+ switch (boot_params.secure_boot) {
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+ case efi_secureboot_mode_unset:
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+ case efi_secureboot_mode_unknown:
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+ case efi_secureboot_mode_disabled:
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+ /*
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+ * sig_unenforce is only applied if SecureBoot is not
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+ * enabled.
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+ */
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+ sig_enforce = !sig_unenforce;
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+ }
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+#endif
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+
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return 0;
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}
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module_init(proc_modules_init);
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--
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https://clearlinux.org
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