arm64: mm: avoid fdt_check_header() before the FDT is fully mapped (04a84810) · Commits · 戴 / test

As reported by Zijun, the fdt_check_header() call in __fixmap_remap_fdt() is not safe since it is not guaranteed that the FDT header is mapped completely. Due to the minimum alignment of 8 bytes, the only fields we can assume to be mapped are 'magic' and 'totalsize'. Since the OF layer is in charge of validating the FDT image, and we are only interested in making reasonably sure that the size field contains a meaningful value, replace the fdt_check_header() call with an explicit comparison of the magic field's value against the expected value. Cc: <stable@vger.kernel.org> Reported-by:

Zijun Hu <zijun_hu@htc.com> Acked-by:

Mark Rutland <mark.rutland@arm.com> Signed-off-by:

Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by:

Will Deacon <will.deacon@arm.com>

arch/arm64/mm/mmu.c

+4 −4

Original line number	Diff line number	Diff line
		@@ -686,9 +686,9 @@ void __init __fixmap_remap_fdt(phys_addr_t dt_phys, int size, pgprot_t prot)
		/*
		* Check whether the physical FDT address is set and meets the minimum
		* alignment requirement. Since we are relying on MIN_FDT_ALIGN to be
		* at least 8 bytes so that we can always access the size field of the
		* FDT header after mapping the first chunk, double check here if that
		* is indeed the case.
		* at least 8 bytes so that we can always access the magic and size
		* fields of the FDT header after mapping the first chunk, double check
		* here if that is indeed the case.
		*/
		BUILD_BUG_ON(MIN_FDT_ALIGN < 8);
		if (!dt_phys \|\| dt_phys % MIN_FDT_ALIGN)
		@@ -716,7 +716,7 @@ void __init __fixmap_remap_fdt(phys_addr_t dt_phys, int size, pgprot_t prot)
		create_mapping_noalloc(round_down(dt_phys, SWAPPER_BLOCK_SIZE),
		dt_virt_base, SWAPPER_BLOCK_SIZE, prot);

		if (fdt_check_header(dt_virt) != 0)
		if (fdt_magic(dt_virt) != FDT_MAGIC)
		return NULL;

		*size = fdt_totalsize(dt_virt);

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