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

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Signed-off-by: Robbie Harwood <rharwood@redhat.com>
This commit is contained in:
Robbie Harwood 2022-10-12 18:08:53 +00:00
parent 4fa957c61c
commit fdd5c6f423
3 changed files with 41 additions and 1 deletions
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36
0284-x86-efi-Fix-an-incorrect-array-size-in-kernel-alloca.patch Normal file
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@ -0,0 +1,36 @@
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>
---
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 ac5ef50bdb..9854b0defa 100644
--- a/grub-core/loader/i386/efi/linux.c
+++ b/grub-core/loader/i386/efi/linux.c
@@ -92,7 +92,7 @@ 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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@ -281,3 +281,4 @@ Patch0280: 0280-blscfg-Don-t-root-device-in-emu-builds.patch
Patch0281: 0281-loader-arm64-linux-Remove-magic-number-header-field-.patch
Patch0282: 0282-Correct-BSS-zeroing-on-aarch64.patch
Patch0283: 0283-linuxefi-Invalidate-i-cache-before-starting-the-kern.patch
Patch0284: 0284-x86-efi-Fix-an-incorrect-array-size-in-kernel-alloca.patch

5
grub2.spec
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@ -17,7 +17,7 @@
Name: grub2
Epoch: 1
Version: 2.06
Release: 59%{?dist}
Release: 60%{?dist}
Summary: Bootloader with support for Linux, Multiboot and more
License: GPLv3+
URL: http://www.gnu.org/software/grub/
@ -530,6 +530,9 @@ mv ${EFI_HOME}/grub.cfg.stb ${EFI_HOME}/grub.cfg
%endif
%changelog
* Wed Oct 12 2022 Robbie Harwood <rharwood@redhat.com> - 2.06-60
- x86-efi: Fix an incorrect array size in kernel allocation
* Tue Oct 04 2022 Robbie Harwood <rharwood@redhat.com> - 2.06-59
- Flush instruction cache before starting aa64 kernel