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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Javier Martinez Canillas <javierm@redhat.com>
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Date: Thu, 23 Apr 2020 15:06:46 +0200
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Subject: [PATCH] efi: Set image base address before jumping to the PE/COFF
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entry point
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Upstream GRUB uses the EFI LoadImage() and StartImage() to boot the Linux
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kernel. But our custom EFI loader that supports Secure Boot instead uses
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the EFI handover protocol (for x86) or jumping directly to the PE/COFF
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entry point (for aarch64).
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This is done to allow the bootloader to verify the images using the shim
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lock protocol to avoid booting untrusted binaries.
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Since the bootloader loads the kernel from the boot media instead of using
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LoadImage(), it is responsible to set the Loaded Image base address before
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booting the kernel.
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Otherwise the kernel EFI stub will complain that it was not set correctly
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and print the following warning message:
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EFI stub: ERROR: FIRMWARE BUG: efi_loaded_image_t::image_base has bogus value
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Resolves: rhbz#1819624
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Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
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---
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grub-core/loader/efi/linux.c | 12 ++++++++++++
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1 file changed, 12 insertions(+)
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diff --git a/grub-core/loader/efi/linux.c b/grub-core/loader/efi/linux.c
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index b56ea0bc041..e09f824862b 100644
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--- a/grub-core/loader/efi/linux.c
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+++ b/grub-core/loader/efi/linux.c
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@@ -72,6 +72,7 @@ grub_err_t
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grub_efi_linux_boot (void *kernel_addr, grub_off_t handover_offset,
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void *kernel_params)
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{
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+ grub_efi_loaded_image_t *loaded_image = NULL;
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handover_func hf;
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int offset = 0;
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@@ -79,6 +80,17 @@ grub_efi_linux_boot (void *kernel_addr, grub_off_t handover_offset,
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offset = 512;
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#endif
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+ /*
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+ * Since the EFI loader is not calling the LoadImage() and StartImage()
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+ * services for loading the kernel and booting respectively, it has to
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+ * set the Loaded Image base address.
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+ */
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+ loaded_image = grub_efi_get_loaded_image (grub_efi_image_handle);
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+ if (loaded_image)
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+ loaded_image->image_base = kernel_addr;
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+ else
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+ grub_dprintf ("linux", "Loaded Image base address could not be set\n");
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+
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grub_dprintf ("linux", "kernel_addr: %p handover_offset: %p params: %p\n",
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kernel_addr, (void *)(grub_efi_uintn_t)handover_offset, kernel_params);
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hf = (handover_func)((char *)kernel_addr + handover_offset + offset);
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