From c1d31b6a26e5542142d569c94a70f1dc8e07afd6 Mon Sep 17 00:00:00 2001
From: Peter Jones <pjones@redhat.com>
Date: Tue, 6 Oct 2015 16:09:25 -0400
Subject: [PATCH 087/123] Make any of the loaders that link in efi mode honor
secure boot.
And in this case "honor" means "even if somebody does link this in, they
won't register commands if SB is enabled."
Signed-off-by: Peter Jones <pjones@redhat.com>
---
grub-core/Makefile.am | 1 +
grub-core/Makefile.core.def | 1 +
grub-core/commands/iorw.c | 7 +++++
grub-core/commands/memrw.c | 7 +++++
grub-core/kern/efi/efi.c | 28 ------------------
grub-core/kern/efi/sb.c | 58 ++++++++++++++++++++++++++++++++++++++
grub-core/loader/efi/appleloader.c | 7 +++++
grub-core/loader/efi/chainloader.c | 1 +
grub-core/loader/i386/bsd.c | 7 +++++
grub-core/loader/i386/linux.c | 7 +++++
grub-core/loader/i386/pc/linux.c | 7 +++++
grub-core/loader/multiboot.c | 7 +++++
grub-core/loader/xnu.c | 7 +++++
include/grub/efi/efi.h | 1 -
include/grub/efi/sb.h | 29 +++++++++++++++++++
include/grub/ia64/linux.h | 0
include/grub/mips/linux.h | 0
include/grub/powerpc/linux.h | 0
include/grub/sparc64/linux.h | 0
19 files changed, 146 insertions(+), 29 deletions(-)
create mode 100644 grub-core/kern/efi/sb.c
create mode 100644 include/grub/efi/sb.h
create mode 100644 include/grub/ia64/linux.h
create mode 100644 include/grub/mips/linux.h
create mode 100644 include/grub/powerpc/linux.h
create mode 100644 include/grub/sparc64/linux.h
diff --git a/grub-core/Makefile.am b/grub-core/Makefile.am
index 04e9395fd..fd715a8ea 100644
--- a/grub-core/Makefile.am
+++ b/grub-core/Makefile.am
@@ -71,6 +71,7 @@ KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/command.h
KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/device.h
KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/disk.h
KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/dl.h
+KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/efi/sb.h
KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/env.h
KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/env_private.h
KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/err.h
diff --git a/grub-core/Makefile.core.def b/grub-core/Makefile.core.def
index 7fba196b3..ac195d10e 100644
--- a/grub-core/Makefile.core.def
+++ b/grub-core/Makefile.core.def
@@ -178,6 +178,7 @@ kernel = {
i386_multiboot = kern/i386/pc/acpi.c;
i386_coreboot = kern/acpi.c;
i386_multiboot = kern/acpi.c;
+ common = kern/efi/sb.c;
x86 = kern/i386/tsc.c;
x86 = kern/i386/tsc_pit.c;
diff --git a/grub-core/commands/iorw.c b/grub-core/commands/iorw.c
index a0c164e54..41a7f3f04 100644
--- a/grub-core/commands/iorw.c
+++ b/grub-core/commands/iorw.c
@@ -23,6 +23,7 @@
#include <grub/env.h>
#include <grub/cpu/io.h>
#include <grub/i18n.h>
+#include <grub/efi/sb.h>
GRUB_MOD_LICENSE ("GPLv3+");
@@ -118,6 +119,9 @@ grub_cmd_write (grub_command_t cmd, int argc, char **argv)
GRUB_MOD_INIT(memrw)
{
+ if (grub_efi_secure_boot())
+ return;
+
cmd_read_byte =
grub_register_extcmd ("inb", grub_cmd_read, 0,
N_("PORT"), N_("Read 8-bit value from PORT."),
@@ -146,6 +150,9 @@ GRUB_MOD_INIT(memrw)
GRUB_MOD_FINI(memrw)
{
+ if (grub_efi_secure_boot())
+ return;
+
grub_unregister_extcmd (cmd_read_byte);
grub_unregister_extcmd (cmd_read_word);
grub_unregister_extcmd (cmd_read_dword);
diff --git a/grub-core/commands/memrw.c b/grub-core/commands/memrw.c
index 98769eadb..088cbe9e2 100644
--- a/grub-core/commands/memrw.c
+++ b/grub-core/commands/memrw.c
@@ -22,6 +22,7 @@
#include <grub/extcmd.h>
#include <grub/env.h>
#include <grub/i18n.h>
+#include <grub/efi/sb.h>
GRUB_MOD_LICENSE ("GPLv3+");
@@ -120,6 +121,9 @@ grub_cmd_write (grub_command_t cmd, int argc, char **argv)
GRUB_MOD_INIT(memrw)
{
+ if (grub_efi_secure_boot())
+ return;
+
cmd_read_byte =
grub_register_extcmd ("read_byte", grub_cmd_read, 0,
N_("ADDR"), N_("Read 8-bit value from ADDR."),
@@ -148,6 +152,9 @@ GRUB_MOD_INIT(memrw)
GRUB_MOD_FINI(memrw)
{
+ if (grub_efi_secure_boot())
+ return;
+
grub_unregister_extcmd (cmd_read_byte);
grub_unregister_extcmd (cmd_read_word);
grub_unregister_extcmd (cmd_read_dword);
diff --git a/grub-core/kern/efi/efi.c b/grub-core/kern/efi/efi.c
index 08599101a..101307fc7 100644
--- a/grub-core/kern/efi/efi.c
+++ b/grub-core/kern/efi/efi.c
@@ -269,34 +269,6 @@ grub_efi_get_variable (const char *var, const grub_efi_guid_t *guid,
return NULL;
}
-grub_efi_boolean_t
-grub_efi_secure_boot (void)
-{
- grub_efi_guid_t efi_var_guid = GRUB_EFI_GLOBAL_VARIABLE_GUID;
- grub_size_t datasize;
- char *secure_boot = NULL;
- char *setup_mode = NULL;
- grub_efi_boolean_t ret = 0;
-
- secure_boot = grub_efi_get_variable("SecureBoot", &efi_var_guid, &datasize);
-
- if (datasize != 1 || !secure_boot)
- goto out;
-
- setup_mode = grub_efi_get_variable("SetupMode", &efi_var_guid, &datasize);
-
- if (datasize != 1 || !setup_mode)
- goto out;
-
- if (*secure_boot && !*setup_mode)
- ret = 1;
-
- out:
- grub_free (secure_boot);
- grub_free (setup_mode);
- return ret;
-}
-
#pragma GCC diagnostic ignored "-Wcast-align"
/* Search the mods section from the PE32/PE32+ image. This code uses
diff --git a/grub-core/kern/efi/sb.c b/grub-core/kern/efi/sb.c
new file mode 100644
index 000000000..a41b6c5b8
--- /dev/null
+++ b/grub-core/kern/efi/sb.c
@@ -0,0 +1,58 @@
+/*
+ * GRUB -- GRand Unified Bootloader
+ * Copyright (C) 2014 Free Software Foundation, Inc.
+ *
+ * GRUB is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * GRUB is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GRUB. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/err.h>
+#include <grub/mm.h>
+#include <grub/types.h>
+#include <grub/cpu/linux.h>
+#include <grub/efi/efi.h>
+#include <grub/efi/pe32.h>
+#include <grub/efi/linux.h>
+#include <grub/efi/sb.h>
+
+int
+grub_efi_secure_boot (void)
+{
+#ifdef GRUB_MACHINE_EFI
+ grub_efi_guid_t efi_var_guid = GRUB_EFI_GLOBAL_VARIABLE_GUID;
+ grub_size_t datasize;
+ char *secure_boot = NULL;
+ char *setup_mode = NULL;
+ grub_efi_boolean_t ret = 0;
+
+ secure_boot = grub_efi_get_variable("SecureBoot", &efi_var_guid, &datasize);
+
+ if (datasize != 1 || !secure_boot)
+ goto out;
+
+ setup_mode = grub_efi_get_variable("SetupMode", &efi_var_guid, &datasize);
+
+ if (datasize != 1 || !setup_mode)
+ goto out;
+
+ if (*secure_boot && !*setup_mode)
+ ret = 1;
+
+ out:
+ grub_free (secure_boot);
+ grub_free (setup_mode);
+ return ret;
+#else
+ return 0;
+#endif
+}
diff --git a/grub-core/loader/efi/appleloader.c b/grub-core/loader/efi/appleloader.c
index 74888c463..69c2a10d3 100644
--- a/grub-core/loader/efi/appleloader.c
+++ b/grub-core/loader/efi/appleloader.c
@@ -24,6 +24,7 @@
#include <grub/misc.h>
#include <grub/efi/api.h>
#include <grub/efi/efi.h>
+#include <grub/efi/sb.h>
#include <grub/command.h>
#include <grub/i18n.h>
@@ -227,6 +228,9 @@ static grub_command_t cmd;
GRUB_MOD_INIT(appleloader)
{
+ if (grub_efi_secure_boot())
+ return;
+
cmd = grub_register_command ("appleloader", grub_cmd_appleloader,
N_("[OPTS]"),
/* TRANSLATORS: This command is used on EFI to
@@ -238,5 +242,8 @@ GRUB_MOD_INIT(appleloader)
GRUB_MOD_FINI(appleloader)
{
+ if (grub_efi_secure_boot())
+ return;
+
grub_unregister_command (cmd);
}
diff --git a/grub-core/loader/efi/chainloader.c b/grub-core/loader/efi/chainloader.c
index 3cbb6c5b8..c4184fa64 100644
--- a/grub-core/loader/efi/chainloader.c
+++ b/grub-core/loader/efi/chainloader.c
@@ -34,6 +34,7 @@
#include <grub/efi/disk.h>
#include <grub/efi/pe32.h>
#include <grub/efi/linux.h>
+#include <grub/efi/sb.h>
#include <grub/command.h>
#include <grub/i18n.h>
#include <grub/net.h>
diff --git a/grub-core/loader/i386/bsd.c b/grub-core/loader/i386/bsd.c
index 7f96515da..87709aa23 100644
--- a/grub-core/loader/i386/bsd.c
+++ b/grub-core/loader/i386/bsd.c
@@ -38,6 +38,7 @@
#ifdef GRUB_MACHINE_PCBIOS
#include <grub/machine/int.h>
#endif
+#include <grub/efi/sb.h>
GRUB_MOD_LICENSE ("GPLv3+");
@@ -2124,6 +2125,9 @@ static grub_command_t cmd_netbsd_module_elf, cmd_openbsd_ramdisk;
GRUB_MOD_INIT (bsd)
{
+ if (grub_efi_secure_boot())
+ return;
+
/* Net and OpenBSD kernels are often compressed. */
grub_dl_load ("gzio");
@@ -2163,6 +2167,9 @@ GRUB_MOD_INIT (bsd)
GRUB_MOD_FINI (bsd)
{
+ if (grub_efi_secure_boot())
+ return;
+
grub_unregister_extcmd (cmd_freebsd);
grub_unregister_extcmd (cmd_openbsd);
grub_unregister_extcmd (cmd_netbsd);
diff --git a/grub-core/loader/i386/linux.c b/grub-core/loader/i386/linux.c
index fddcc461d..b0afccac9 100644
--- a/grub-core/loader/i386/linux.c
+++ b/grub-core/loader/i386/linux.c
@@ -35,6 +35,7 @@
#include <grub/i18n.h>
#include <grub/lib/cmdline.h>
#include <grub/linux.h>
+#include <grub/efi/sb.h>
GRUB_MOD_LICENSE ("GPLv3+");
@@ -1136,6 +1137,9 @@ static grub_command_t cmd_linux, cmd_initrd;
GRUB_MOD_INIT(linux)
{
+ if (grub_efi_secure_boot())
+ return;
+
cmd_linux = grub_register_command ("linux", grub_cmd_linux,
0, N_("Load Linux."));
cmd_initrd = grub_register_command ("initrd", grub_cmd_initrd,
@@ -1145,6 +1149,9 @@ GRUB_MOD_INIT(linux)
GRUB_MOD_FINI(linux)
{
+ if (grub_efi_secure_boot())
+ return;
+
grub_unregister_command (cmd_linux);
grub_unregister_command (cmd_initrd);
}
diff --git a/grub-core/loader/i386/pc/linux.c b/grub-core/loader/i386/pc/linux.c
index a293b17aa..91283157e 100644
--- a/grub-core/loader/i386/pc/linux.c
+++ b/grub-core/loader/i386/pc/linux.c
@@ -35,6 +35,7 @@
#include <grub/i386/floppy.h>
#include <grub/lib/cmdline.h>
#include <grub/linux.h>
+#include <grub/efi/sb.h>
GRUB_MOD_LICENSE ("GPLv3+");
@@ -472,6 +473,9 @@ static grub_command_t cmd_linux, cmd_initrd;
GRUB_MOD_INIT(linux16)
{
+ if (grub_efi_secure_boot())
+ return;
+
cmd_linux =
grub_register_command ("linux16", grub_cmd_linux,
0, N_("Load Linux."));
@@ -483,6 +487,9 @@ GRUB_MOD_INIT(linux16)
GRUB_MOD_FINI(linux16)
{
+ if (grub_efi_secure_boot())
+ return;
+
grub_unregister_command (cmd_linux);
grub_unregister_command (cmd_initrd);
}
diff --git a/grub-core/loader/multiboot.c b/grub-core/loader/multiboot.c
index 73aa0aa12..64a651322 100644
--- a/grub-core/loader/multiboot.c
+++ b/grub-core/loader/multiboot.c
@@ -42,6 +42,7 @@
#include <grub/video.h>
#include <grub/memory.h>
#include <grub/i18n.h>
+#include <grub/efi/sb.h>
GRUB_MOD_LICENSE ("GPLv3+");
@@ -391,6 +392,9 @@ static grub_command_t cmd_multiboot, cmd_module;
GRUB_MOD_INIT(multiboot)
{
+ if (grub_efi_secure_boot())
+ return;
+
cmd_multiboot =
#ifdef GRUB_USE_MULTIBOOT2
grub_register_command ("multiboot2", grub_cmd_multiboot,
@@ -411,6 +415,9 @@ GRUB_MOD_INIT(multiboot)
GRUB_MOD_FINI(multiboot)
{
+ if (grub_efi_secure_boot())
+ return;
+
grub_unregister_command (cmd_multiboot);
grub_unregister_command (cmd_module);
}
diff --git a/grub-core/loader/xnu.c b/grub-core/loader/xnu.c
index c9885b1bc..df8dfdb4b 100644
--- a/grub-core/loader/xnu.c
+++ b/grub-core/loader/xnu.c
@@ -33,6 +33,7 @@
#include <grub/extcmd.h>
#include <grub/env.h>
#include <grub/i18n.h>
+#include <grub/efi/sb.h>
GRUB_MOD_LICENSE ("GPLv3+");
@@ -1469,6 +1470,9 @@ static grub_extcmd_t cmd_splash;
GRUB_MOD_INIT(xnu)
{
+ if (grub_efi_secure_boot())
+ return;
+
cmd_kernel = grub_register_command ("xnu_kernel", grub_cmd_xnu_kernel, 0,
N_("Load XNU image."));
cmd_kernel64 = grub_register_command ("xnu_kernel64", grub_cmd_xnu_kernel64,
@@ -1509,6 +1513,9 @@ GRUB_MOD_INIT(xnu)
GRUB_MOD_FINI(xnu)
{
+ if (grub_efi_secure_boot())
+ return;
+
#ifndef GRUB_MACHINE_EMU
grub_unregister_command (cmd_resume);
#endif
diff --git a/include/grub/efi/efi.h b/include/grub/efi/efi.h
index 22456327e..9a2da0eb3 100644
--- a/include/grub/efi/efi.h
+++ b/include/grub/efi/efi.h
@@ -76,7 +76,6 @@ EXPORT_FUNC (grub_efi_set_variable) (const char *var,
const grub_efi_guid_t *guid,
void *data,
grub_size_t datasize);
-grub_efi_boolean_t EXPORT_FUNC (grub_efi_secure_boot) (void);
int
EXPORT_FUNC (grub_efi_compare_device_paths) (const grub_efi_device_path_t *dp1,
const grub_efi_device_path_t *dp2);
diff --git a/include/grub/efi/sb.h b/include/grub/efi/sb.h
new file mode 100644
index 000000000..9629fbb0f
--- /dev/null
+++ b/include/grub/efi/sb.h
@@ -0,0 +1,29 @@
+/* sb.h - declare functions for EFI Secure Boot support */
+/*
+ * GRUB -- GRand Unified Bootloader
+ * Copyright (C) 2006,2007,2008,2009 Free Software Foundation, Inc.
+ *
+ * GRUB is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * GRUB is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GRUB. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GRUB_EFI_SB_HEADER
+#define GRUB_EFI_SB_HEADER 1
+
+#include <grub/types.h>
+#include <grub/dl.h>
+
+/* Functions. */
+int EXPORT_FUNC (grub_efi_secure_boot) (void);
+
+#endif /* ! GRUB_EFI_SB_HEADER */
diff --git a/include/grub/ia64/linux.h b/include/grub/ia64/linux.h
new file mode 100644
index 000000000..e69de29bb
diff --git a/include/grub/mips/linux.h b/include/grub/mips/linux.h
new file mode 100644
index 000000000..e69de29bb
diff --git a/include/grub/powerpc/linux.h b/include/grub/powerpc/linux.h
new file mode 100644
index 000000000..e69de29bb
diff --git a/include/grub/sparc64/linux.h b/include/grub/sparc64/linux.h
new file mode 100644
index 000000000..e69de29bb
--
2.14.3