From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001

From: Peter Jones <pjones@redhat.com>

Date: Tue, 6 Oct 2015 16:09:25 -0400

Subject: [PATCH] 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.core.def        |  2 ++

 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

 grub-core/Makefile.am              |  1 +

 19 files changed, 147 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.core.def b/grub-core/Makefile.core.def

index 4fc74393335..b340ceeec7f 100644

--- a/grub-core/Makefile.core.def

+++ b/grub-core/Makefile.core.def

@@ -175,6 +175,8 @@ kernel = {

   efi = term/efi/console.c;

   efi = lib/envblk.c;

+  common = kern/efi/sb.c;

+

   x86 = kern/i386/tsc.c;

   i386_efi = kern/i386/efi/init.c;

diff --git a/grub-core/commands/iorw.c b/grub-core/commands/iorw.c

index a0c164e54f0..41a7f3f0466 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 98769eadb34..088cbe9e2bc 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 c80d85b677e..7dfe2ef1455 100644

--- a/grub-core/kern/efi/efi.c

+++ b/grub-core/kern/efi/efi.c

@@ -260,34 +260,6 @@ 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 00000000000..a41b6c5b851

--- /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 74888c463ba..69c2a10d351 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 87a91e16f17..aee8e6becf6 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 8f691e0e2d1..b671f59b62a 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+");

@@ -2111,6 +2112,9 @@ 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");

@@ -2150,6 +2154,9 @@ 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 2ae176315b6..bd37c69b5d0 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+");

@@ -1137,6 +1138,9 @@ 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,

@@ -1146,6 +1150,9 @@ 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 b481e466846..b19527e8e17 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+");

@@ -469,6 +470,9 @@ 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."));

@@ -480,6 +484,9 @@ 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 4b71f336353..e4e696e8f89 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+");

@@ -383,6 +384,9 @@ 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,

@@ -403,6 +407,9 @@ 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 cdd9715cedd..faffccc9744 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+");

@@ -1466,6 +1467,9 @@ 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,

@@ -1506,6 +1510,9 @@ 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 22456327e13..9a2da0eb38d 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 00000000000..9629fbb0f9e

--- /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 00000000000..e69de29bb2d

diff --git a/include/grub/mips/linux.h b/include/grub/mips/linux.h

new file mode 100644

index 00000000000..e69de29bb2d

diff --git a/include/grub/powerpc/linux.h b/include/grub/powerpc/linux.h

new file mode 100644

index 00000000000..e69de29bb2d

diff --git a/include/grub/sparc64/linux.h b/include/grub/sparc64/linux.h

new file mode 100644

index 00000000000..e69de29bb2d

diff --git a/grub-core/Makefile.am b/grub-core/Makefile.am

index cb7fd9f98e8..be29e327f77 100644

--- a/grub-core/Makefile.am

+++ b/grub-core/Makefile.am

@@ -67,6 +67,7 @@ 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