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x86-efi: Fix an incorrect array size in kernel allocation

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Resolves: #2031289
Signed-off-by: Robbie Harwood <rharwood@redhat.com>
This commit is contained in:
Robbie Harwood 2022-10-12 19:44:29 +00:00
parent c1ebf6e8ba
commit 1db6b68958
3 changed files with 43 additions and 1 deletions
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37
0290-x86-efi-Fix-an-incorrect-array-size-in-kernel-alloca.patch Normal file
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@ -0,0 +1,37 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Peter Jones <pjones@redhat.com>
Date: Tue, 11 Oct 2022 17:00:50 -0400
Subject: [PATCH] x86-efi: Fix an incorrect array size in kernel allocation
In 81a6ebf62bbe166ddc968463df2e8bd481bf697c ("efi: split allocation
policy for kernel vs initrd memories."), I introduced a split in the
kernel allocator to allow for different dynamic policies for the kernel
and the initrd allocations.
Unfortunately, that change increased the size of the policy data used to
make decisions, but did not change the size of the temporary storage we
use to back it up and restore. This results in some of .data getting
clobbered at runtime, and hilarity ensues.
This patch makes the size of the backup storage be based on the size of
the initial policy data.
Signed-off-by: Peter Jones <pjones@redhat.com>
(cherry picked from commit 37747b22342499a798ca3a8895770cd93b6e1258)
---
grub-core/loader/i386/efi/linux.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/grub-core/loader/i386/efi/linux.c b/grub-core/loader/i386/efi/linux.c
index f23b3f7b01..18aadc3e07 100644
--- a/grub-core/loader/i386/efi/linux.c
+++ b/grub-core/loader/i386/efi/linux.c
@@ -93,7 +93,7 @@ static struct allocation_choice max_addresses[] =
{ INITRD_MEM, GRUB_EFI_MAX_ALLOCATION_ADDRESS, GRUB_EFI_ALLOCATE_MAX_ADDRESS },
{ NO_MEM, 0, 0 }
};
-static struct allocation_choice saved_addresses[4];
+static struct allocation_choice saved_addresses[sizeof(max_addresses) / sizeof(max_addresses[0])];
#define save_addresses() grub_memcpy(saved_addresses, max_addresses, sizeof(max_addresses))
#define restore_addresses() grub_memcpy(max_addresses, saved_addresses, sizeof(max_addresses))

1
grub.patches
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@ -287,3 +287,4 @@ Patch0286: 0286-ieee1275-implement-vec5-for-cas-negotiation.patch
Patch0287: 0287-squish-don-t-dup-rhgb-quiet-check-mtimes.patch
Patch0288: 0288-squish-give-up-on-rhgb-quiet.patch
Patch0289: 0289-squish-BLS-only-write-etc-kernel-cmdline-if-writable.patch
Patch0290: 0290-x86-efi-Fix-an-incorrect-array-size-in-kernel-alloca.patch

6
grub2.spec
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@ -14,7 +14,7 @@
Name: grub2
Epoch: 1
Version: 2.06
Release: 46%{?dist}
Release: 47%{?dist}
Summary: Bootloader with support for Linux, Multiboot and more
License: GPLv3+
URL: http://www.gnu.org/software/grub/
@ -532,6 +532,10 @@ mv ${EFI_HOME}/grub.cfg.stb ${EFI_HOME}/grub.cfg
%endif
%changelog
* Wed Oct 12 2022 Robbie Harwood <rharwood@redhat.com> - 2.06-47
- x86-efi: Fix an incorrect array size in kernel allocation
- Resolves: #2031289
* Thu Aug 25 2022 Robbie Harwood <rharwood@redhat.com> - 2.06-46
- Sync /etc/kernel/cmdline generation with 2.06-52.fc38
- Resolves: #1969362