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From 7a65d7b558974c89f19afaf0d78b54dc0327f56c Mon Sep 17 00:00:00 2001
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From: Matthew Garrett <mjg@redhat.com>
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Date: Wed, 15 Aug 2012 09:53:05 -0400
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Subject: [PATCH] Don't permit insmod on secure boot
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---
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grub-core/kern/corecmd.c | 9 +++++++++
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grub-core/kern/efi/efi.c | 28 ++++++++++++++++++++++++++++
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include/grub/efi/efi.h | 1 +
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3 files changed, 38 insertions(+)
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diff --git a/grub-core/kern/corecmd.c b/grub-core/kern/corecmd.c
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index eec575c..3df9dbd 100644
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--- a/grub-core/kern/corecmd.c
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+++ b/grub-core/kern/corecmd.c
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@@ -28,6 +28,10 @@
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#include <grub/command.h>
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#include <grub/i18n.h>
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+#ifdef GRUB_MACHINE_EFI
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+#include <grub/efi/efi.h>
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+#endif
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+
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/* set ENVVAR=VALUE */
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static grub_err_t
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grub_core_cmd_set (struct grub_command *cmd __attribute__ ((unused)),
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@@ -81,6 +85,13 @@ grub_core_cmd_insmod (struct grub_command *cmd __attribute__ ((unused)),
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{
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grub_dl_t mod;
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+#ifdef GRUB_MACHINE_EFI
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+ if (grub_efi_secure_boot()) {
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+ //grub_printf("%s\n", N_("Secure Boot forbids insmod"));
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+ return 0;
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+ }
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+#endif
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+
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if (argc == 0)
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return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("one argument expected"));
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diff --git a/grub-core/kern/efi/efi.c b/grub-core/kern/efi/efi.c
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index 820968f..ad7aa8d 100644
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--- a/grub-core/kern/efi/efi.c
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+++ b/grub-core/kern/efi/efi.c
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@@ -259,6 +259,34 @@ grub_efi_set_variable(const char *var, const grub_efi_guid_t *guid,
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return grub_error (GRUB_ERR_IO, "could not set EFI variable `%s'", var);
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}
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+grub_efi_boolean_t
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+grub_efi_secure_boot (void)
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+{
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+ grub_efi_guid_t efi_var_guid = GRUB_EFI_GLOBAL_VARIABLE_GUID;
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+ grub_size_t datasize;
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+ char *secure_boot = NULL;
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+ char *setup_mode = NULL;
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+ grub_efi_boolean_t ret = 0;
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+
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+ secure_boot = grub_efi_get_variable("SecureBoot", &efi_var_guid, &datasize);
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+
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+ if (datasize != 1 || !secure_boot)
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+ goto out;
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+
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+ setup_mode = grub_efi_get_variable("SetupMode", &efi_var_guid, &datasize);
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+
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+ if (datasize != 1 || !setup_mode)
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+ goto out;
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+
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+ if (*secure_boot && !*setup_mode)
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+ ret = 1;
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+
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+ out:
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+ grub_free (secure_boot);
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+ grub_free (setup_mode);
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+ return ret;
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+}
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+
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#pragma GCC diagnostic ignored "-Wcast-align"
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/* Search the mods section from the PE32/PE32+ image. This code uses
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diff --git a/include/grub/efi/efi.h b/include/grub/efi/efi.h
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index 9370fd5..a000c38 100644
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--- a/include/grub/efi/efi.h
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+++ b/include/grub/efi/efi.h
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@@ -72,6 +72,7 @@ EXPORT_FUNC (grub_efi_set_variable) (const char *var,
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const grub_efi_guid_t *guid,
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void *data,
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grub_size_t datasize);
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+grub_efi_boolean_t EXPORT_FUNC (grub_efi_secure_boot) (void);
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int
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EXPORT_FUNC (grub_efi_compare_device_paths) (const grub_efi_device_path_t *dp1,
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const grub_efi_device_path_t *dp2);
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--
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1.7.11.2
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