78 lines
1.6 KiB
C
78 lines
1.6 KiB
C
/**
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Allows to choose a random KASLR slide offset,
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when some offsets cannot be used.
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by Download-Fritz & vit9696
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**/
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#ifndef APTIOFIX_CUSTOM_SLIDE_H
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#define APTIOFIX_CUSTOM_SLIDE_H
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#include "BootArgs.h"
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//
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// Base kernel address.
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//
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#define BASE_KERNEL_ADDR ((UINTN)0x100000)
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//
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// Slide offset per slide entry
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//
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#define SLIDE_GRANULARITY ((UINTN)0x200000)
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//
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// Total possible number of KASLR slide offsets.
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//
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#define TOTAL_SLIDE_NUM 256
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/**
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* Ensures that the original csr-active-config is passed to the kernel,
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* and removes customised slide value for security reasons.
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* @return VOID
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*/
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VOID
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RestoreCustomSlideOverrides (
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AMF_BOOT_ARGUMENTS *BA
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);
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/**
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* Patches boot.efi to support random and passed slide values in safe mode.
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* @param ImageBase
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* @param ImageSize
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* @return VOID
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*/
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VOID
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UnlockSlideSupportForSafeMode (
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UINT8 *ImageBase,
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UINTN ImageSize
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);
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/**
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* Custom gRT->GetVariable override used to return customised values
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* for boot-args and csr-active-config variables.
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* @return EFI_STATUS
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*/
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EFI_STATUS
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EFIAPI
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GetVariableCustomSlide (
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IN CHAR16 *VariableName,
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IN EFI_GUID *VendorGuid,
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OUT UINT32 *Attributes OPTIONAL,
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IN OUT UINTN *DataSize,
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OUT VOID *Data
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);
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/**
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* Checks whether the area overlaps with a possible kernel image area.
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* Returns TRUE if the given mem area overlaps, otherwise returns FALSE.
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* @return TRUE or FALSE
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*/
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BOOLEAN
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OverlapsWithSlide (
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EFI_PHYSICAL_ADDRESS Address,
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UINTN Size
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);
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#endif // APTIOFIX_CUSTOM_SLIDE_H
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