d10d6fb187
Porting patches from grub2_2.06-3~deb11u4 to fix CVE-2022-2601/CVE-2022-3775. The source code of grub2_2.06-3~deb11u4 is from: https://snapshot.debian.org/archive/debian/20221124T030451Z/ pool/main/g/grub2/grub2_2.06-3~deb11u4.debian.tar.xz Refer to above source code and this link for the fix: https://lists.gnu.org/archive/html/grub-devel/2022-11/msg00059.html The 1st patch in the list is for making proper context for the 14 patches of the 2 CVEs. No content changes for all the patches from debian release. We do this because grub2/grub-efi is ported from wrlinux for secure boot bringing up. Test plan: - PASS: build grub2/grub-efi. - PASS: build-image and install and boot up on lab/qemu. - PASS: check that the "stx.N" version number is right for both bios(grub2 ver) and uefi(grub-efi ver) boot. Closes-bug: 2020730 Signed-off-by: Li Zhou <li.zhou@windriver.com> Change-Id: Ia6c58a2021a786ef92f760b3cfe035fbccedacf7
55 lines
2.1 KiB
Diff
55 lines
2.1 KiB
Diff
From 630deb8c0d8b02b670ced4b7030414bcf17aa080 Mon Sep 17 00:00:00 2001
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From: Zhang Boyang <zhangboyang.id@gmail.com>
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Date: Sun, 14 Aug 2022 15:51:54 +0800
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Subject: [PATCH 09/14] kern/efi/sb: Enforce verification of font files
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As a mitigation and hardening measure enforce verification of font
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files. Then only trusted font files can be load. This will reduce the
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attack surface at cost of losing the ability of end-users to customize
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fonts if e.g. UEFI Secure Boot is enabled. Vendors can always customize
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fonts because they have ability to pack fonts into their GRUB bundles.
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This goal is achieved by:
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* Removing GRUB_FILE_TYPE_FONT from shim lock verifier's
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skip-verification list.
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* Adding GRUB_FILE_TYPE_FONT to lockdown verifier's defer-auth list,
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so font files must be verified by a verifier before they can be loaded.
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Suggested-by: Daniel Kiper <daniel.kiper@oracle.com>
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Signed-off-by: Zhang Boyang <zhangboyang.id@gmail.com>
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Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
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---
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grub-core/kern/efi/sb.c | 1 -
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grub-core/kern/lockdown.c | 1 +
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2 files changed, 1 insertion(+), 1 deletion(-)
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diff --git a/grub-core/kern/efi/sb.c b/grub-core/kern/efi/sb.c
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index 89c4bb3fd..db42c2539 100644
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--- a/grub-core/kern/efi/sb.c
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+++ b/grub-core/kern/efi/sb.c
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@@ -145,7 +145,6 @@ shim_lock_verifier_init (grub_file_t io __attribute__ ((unused)),
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case GRUB_FILE_TYPE_PRINT_BLOCKLIST:
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case GRUB_FILE_TYPE_TESTLOAD:
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case GRUB_FILE_TYPE_GET_SIZE:
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- case GRUB_FILE_TYPE_FONT:
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case GRUB_FILE_TYPE_ZFS_ENCRYPTION_KEY:
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case GRUB_FILE_TYPE_CAT:
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case GRUB_FILE_TYPE_HEXCAT:
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diff --git a/grub-core/kern/lockdown.c b/grub-core/kern/lockdown.c
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index 0bc70fd42..af6d493cd 100644
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--- a/grub-core/kern/lockdown.c
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+++ b/grub-core/kern/lockdown.c
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@@ -51,6 +51,7 @@ lockdown_verifier_init (grub_file_t io __attribute__ ((unused)),
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case GRUB_FILE_TYPE_EFI_CHAINLOADED_IMAGE:
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case GRUB_FILE_TYPE_ACPI_TABLE:
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case GRUB_FILE_TYPE_DEVICE_TREE_IMAGE:
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+ case GRUB_FILE_TYPE_FONT:
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*flags = GRUB_VERIFY_FLAGS_DEFER_AUTH;
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/* Fall through. */
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--
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2.30.2
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