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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: Thu, 9 Sep 2021 10:59:28 -0400
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Subject: [PATCH] Arm: check for the PE magic for the compiled arch
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In "arm64: Fix EFI loader kernel image allocation", Ben fixed the kernel
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alignment to match the alignment given in the PE header. In doing so, a
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check for valid PE magic was added, which was hard-coded to the value
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seen on Aarch64 (GRUB_PE32_PE64_MAGIC).
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Unfortunately, this code is shared between 64-bit and 32-bit, and so
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that value broke 32-bit Arm systems.
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This patch adds a constant definition for GRUB_PE32_PEXX_MAGIC, which is
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either GRUB_PE32_PE64_MAGIC or GRUB_PE32_PE32_MAGIC, depending on which
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platform is being built, and uses it in the header magic check.
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Resolves: rhbz#2000756
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Signed-off-by: Peter Jones <pjones@redhat.com>
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---
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grub-core/loader/arm64/linux.c | 2 +-
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include/grub/arm/linux.h | 1 +
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include/grub/arm64/linux.h | 1 +
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3 files changed, 3 insertions(+), 1 deletion(-)
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diff --git a/grub-core/loader/arm64/linux.c b/grub-core/loader/arm64/linux.c
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index 4a252d5e7e..f18d90bd74 100644
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--- a/grub-core/loader/arm64/linux.c
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+++ b/grub-core/loader/arm64/linux.c
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@@ -322,7 +322,7 @@ parse_pe_header (void *kernel, grub_uint64_t *total_size,
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pe = (void *)((unsigned long)kernel + lh->hdr_offset);
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- if (pe->opt.magic != GRUB_PE32_PE64_MAGIC)
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+ if (pe->opt.magic != GRUB_PE32_PEXX_MAGIC)
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return grub_error(GRUB_ERR_BAD_OS, "Invalid PE optional header magic");
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*total_size = pe->opt.image_size;
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diff --git a/include/grub/arm/linux.h b/include/grub/arm/linux.h
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index b582f67f66..966a5074f5 100644
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--- a/include/grub/arm/linux.h
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+++ b/include/grub/arm/linux.h
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@@ -44,6 +44,7 @@ struct grub_arm_linux_pe_header
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#if defined(__arm__)
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# define GRUB_LINUX_ARMXX_MAGIC_SIGNATURE GRUB_LINUX_ARM_MAGIC_SIGNATURE
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+# define GRUB_PE32_PEXX_MAGIC GRUB_PE32_PE32_MAGIC
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# define linux_arch_kernel_header linux_arm_kernel_header
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# define grub_armxx_linux_pe_header grub_arm_linux_pe_header
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#endif
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diff --git a/include/grub/arm64/linux.h b/include/grub/arm64/linux.h
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index ea030312df..422bf2bf24 100644
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--- a/include/grub/arm64/linux.h
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+++ b/include/grub/arm64/linux.h
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@@ -48,6 +48,7 @@ struct grub_arm64_linux_pe_header
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#if defined(__aarch64__)
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# define GRUB_LINUX_ARMXX_MAGIC_SIGNATURE GRUB_LINUX_ARM64_MAGIC_SIGNATURE
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+# define GRUB_PE32_PEXX_MAGIC GRUB_PE32_PE64_MAGIC
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# define linux_arch_kernel_header linux_arm64_kernel_header
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# define grub_armxx_linux_pe_header grub_arm64_linux_pe_header
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#endif
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