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