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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Jan Hlavac <jhlavac@redhat.com>
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Date: Fri, 20 Nov 2020 23:51:47 +0100
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Subject: [PATCH] grub-install: disable support for EFI platforms
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For each platform, GRUB is shipped as a kernel image and a set of
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modules. These files are then used by the grub-install utility to
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install GRUB on a specific device. However, in order to support UEFI
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Secure Boot, the resulting EFI binary must be signed by a recognized
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private key. For this reason, for EFI platforms, most distributions also
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ship prebuilt EFI binaries signed by a distribution-specific private
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key. In this case, however, the grub-install utility should not be used
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because it would overwrite the signed EFI binary.
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The current fix is suboptimal because it preserves all EFI-related code.
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A better solution could be to modularize the code and provide a
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build-time option.
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Resolves: rhbz#1737444
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Signed-off-by: Jan Hlavac <jhlavac@redhat.com>
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[rharwood: drop man page]
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---
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util/grub-install.c | 37 ++++++++++++++++---------------------
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docs/grub.texi | 7 +++++++
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2 files changed, 23 insertions(+), 21 deletions(-)
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diff --git a/util/grub-install.c b/util/grub-install.c
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index a2bec7446c..5babc7af55 100644
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--- a/util/grub-install.c
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+++ b/util/grub-install.c
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@@ -899,6 +899,22 @@ main (int argc, char *argv[])
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platform = grub_install_get_target (grub_install_source_directory);
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+ switch (platform)
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+ {
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+ case GRUB_INSTALL_PLATFORM_ARM_EFI:
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+ case GRUB_INSTALL_PLATFORM_ARM64_EFI:
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+ case GRUB_INSTALL_PLATFORM_I386_EFI:
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+ case GRUB_INSTALL_PLATFORM_IA64_EFI:
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+ case GRUB_INSTALL_PLATFORM_X86_64_EFI:
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+ is_efi = 1;
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+ grub_util_error (_("this utility cannot be used for EFI platforms"
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+ " because it does not support UEFI Secure Boot"));
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+ break;
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+ default:
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+ is_efi = 0;
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+ break;
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+ }
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+
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{
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char *platname = grub_install_get_platform_name (platform);
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fprintf (stderr, _("Installing for %s platform.\n"), platname);
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@@ -1011,28 +1027,7 @@ main (int argc, char *argv[])
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grub_hostfs_init ();
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grub_host_init ();
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- switch (platform)
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- {
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- case GRUB_INSTALL_PLATFORM_I386_EFI:
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- case GRUB_INSTALL_PLATFORM_X86_64_EFI:
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- case GRUB_INSTALL_PLATFORM_ARM_EFI:
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- case GRUB_INSTALL_PLATFORM_ARM64_EFI:
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- case GRUB_INSTALL_PLATFORM_RISCV32_EFI:
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- case GRUB_INSTALL_PLATFORM_RISCV64_EFI:
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- case GRUB_INSTALL_PLATFORM_IA64_EFI:
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- is_efi = 1;
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- break;
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- default:
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- is_efi = 0;
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- break;
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-
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- /* pacify warning. */
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- case GRUB_INSTALL_PLATFORM_MAX:
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- break;
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- }
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-
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/* Find the EFI System Partition. */
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-
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if (is_efi)
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{
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grub_fs_t fs;
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diff --git a/docs/grub.texi b/docs/grub.texi
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index 04ed6ac1f0..4870faaa00 100644
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--- a/docs/grub.texi
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+++ b/docs/grub.texi
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@@ -6509,6 +6509,13 @@ grub2-install @var{install_device}
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The device name @var{install_device} is an OS device name or a GRUB
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device name.
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+In order to support UEFI Secure Boot, the resulting GRUB EFI binary must
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+be signed by a recognized private key. For this reason, for EFI
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+platforms, most distributions also ship prebuilt GRUB EFI binaries
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+signed by a distribution-specific private key. In this case, however,
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+@command{grub2-install} should not be used because it would overwrite
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+the signed EFI binary.
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+
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@command{grub2-install} accepts the following options:
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@table @option
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