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Commit 2b5088f7 authored by Dave Anderson's avatar Dave Anderson Committed by Joonwoo Park
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arm64: Fix for the arm64 kern_addr_valid() function 



Fix for the arm64 kern_addr_valid() function to recognize
virtual addresses in the kernel logical memory map.  The
function fails as written because it does not check whether
the addresses in that region are mapped at the pmd level to
2MB or 512MB pages, continues the page table walk to the
pte level, and issues a garbage value to pfn_valid().

Tested on 4K-page and 64K-page kernels.

Signed-off-by: default avatarDave Anderson <anderson@redhat.com>
Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git


Git-commit: da6e4cb67c6dd1f72257c0a4a97c26dc4e80d3a7
Signed-off-by: default avatarJoonwoo Park <joonwoop@codeaurora.org>
parent f70e084a

arch/arm64/mm/mmu.c

+3 −0
Original line number Diff line number Diff line
@@ -638,6 +638,9 @@ int kern_addr_valid(unsigned long addr) 
	if (pmd_none(*pmd))

		return 0;



	if (pmd_sect(*pmd))

		return pfn_valid(pmd_pfn(*pmd));



	pte = pte_offset_kernel(pmd, addr);

	if (pte_none(*pte))

		return 0;