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stub: Refuse operation if kernel lacks EFI handover support

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This commit is contained in:
Jan Janssen
2022-09-20 12:54:53 +02:00
parent 6944c61163
commit 757d6c916d
1 changed files with 13 additions and 0 deletions
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src/boot/efi/linux_x86.c
+13
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@@ -28,6 +28,13 @@
enum {
XLF_KERNEL_64 = 1 << 0,
XLF_CAN_BE_LOADED_ABOVE_4G = 1 << 1,
XLF_EFI_HANDOVER_32 = 1 << 2,
XLF_EFI_HANDOVER_64 = 1 << 3,
#ifdef __x86_64__
XLF_EFI_HANDOVER = XLF_EFI_HANDOVER_64,
#else
XLF_EFI_HANDOVER = XLF_EFI_HANDOVER_32,
#endif
};
typedef struct {
@@ -138,6 +145,12 @@ EFI_STATUS linux_exec(
if (!image_params->hdr.relocatable_kernel)
return log_error_status_stall(EFI_UNSUPPORTED, u"Kernel is not relocatable.");
/* The xloadflags were added in version 2.12+ of the boot protocol but the handover support predates
* that, so we cannot safety-check this for 2.11. */
if (image_params->hdr.version >= SETUP_VERSION_2_12 &&
!FLAGS_SET(image_params->hdr.xloadflags, XLF_EFI_HANDOVER))
return log_error_status_stall(EFI_UNSUPPORTED, u"Kernel does not support EFI handover protocol.");
bool can_4g = image_params->hdr.version >= SETUP_VERSION_2_12 &&
FLAGS_SET(image_params->hdr.xloadflags, XLF_CAN_BE_LOADED_ABOVE_4G);