Commit bd264d04 authored by Ard Biesheuvel's avatar Ard Biesheuvel Committed by Catalin Marinas
Browse files

arm64: efi: always map runtime services code and data regions down to pages 



To avoid triggering diagnostics in the MMU code that are finicky about
splitting block mappings into more granular mappings, ensure that regions
that are likely to appear in the Memory Attributes table as well as the
UEFI memory map are always mapped down to pages. This way, we can use
apply_to_page_range() instead of create_pgd_mapping() for the second pass,
which cannot split or merge block entries, and operates strictly on PTEs.

Note that this aligns the arm64 Memory Attributes table handling code with
the ARM code, which already uses apply_to_page_range() to set the strict
permissions.

Signed-off-by: default avatarArd Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
parent 53e1b329

arch/arm64/include/asm/efi.h

+1 −2
Original line number Diff line number Diff line
@@ -14,8 +14,7 @@ extern void efi_init(void); 
#endif



int efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md);



#define efi_set_mapping_permissions	efi_create_mapping

int efi_set_mapping_permissions(struct mm_struct *mm, efi_memory_desc_t *md);



#define arch_efi_call_virt_setup()					\

({									\

arch/arm64/kernel/efi.c

+35 −1
Original line number Diff line number Diff line
@@ -62,13 +62,47 @@ struct screen_info screen_info __section(.data); 
int __init efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md)

{

	pteval_t prot_val = create_mapping_protection(md);

	bool allow_block_mappings = (md->type != EFI_RUNTIME_SERVICES_CODE &&

				     md->type != EFI_RUNTIME_SERVICES_DATA);



	create_pgd_mapping(mm, md->phys_addr, md->virt_addr,

			   md->num_pages << EFI_PAGE_SHIFT,

			   __pgprot(prot_val | PTE_NG), true);

			   __pgprot(prot_val | PTE_NG), allow_block_mappings);

	return 0;

}



static int __init set_permissions(pte_t *ptep, pgtable_t token,

				  unsigned long addr, void *data)

{

	efi_memory_desc_t *md = data;

	pte_t pte = *ptep;



	if (md->attribute & EFI_MEMORY_RO)

		pte = set_pte_bit(pte, __pgprot(PTE_RDONLY));

	if (md->attribute & EFI_MEMORY_XP)

		pte = set_pte_bit(pte, __pgprot(PTE_PXN));

	set_pte(ptep, pte);

	return 0;

}



int __init efi_set_mapping_permissions(struct mm_struct *mm,

				       efi_memory_desc_t *md)

{

	BUG_ON(md->type != EFI_RUNTIME_SERVICES_CODE &&

	       md->type != EFI_RUNTIME_SERVICES_DATA);



	/*

	 * Calling apply_to_page_range() is only safe on regions that are

	 * guaranteed to be mapped down to pages. Since we are only called

	 * for regions that have been mapped using efi_create_mapping() above

	 * (and this is checked by the generic Memory Attributes table parsing

	 * routines), there is no need to check that again here.

	 */

	return apply_to_page_range(mm, md->virt_addr,

				   md->num_pages << EFI_PAGE_SHIFT,

				   set_permissions, md);

}



static int __init arm64_dmi_init(void)

{

	/*

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