In the event that the start address of the initrd is not aligned, but has an aligned size, the base + size will not cover the entire initrd image and there is a chance that the kernel will corrupt the tail of the image.
By aligning the end of the initrd to a page boundary and then subtracting the adjusted start address the memblock reservation will cover all pages that contains the initrd.
Fixes: c756c592e442 ("arm64: Utilize phys_initrd_start/phys_initrd_size") Cc: stable@vger.kernel.org Signed-off-by: Bjorn Andersson bjorn.andersson@linaro.org --- arch/arm64/mm/init.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c index 6bc135042f5e..7cae155e81a5 100644 --- a/arch/arm64/mm/init.c +++ b/arch/arm64/mm/init.c @@ -363,7 +363,7 @@ void __init arm64_memblock_init(void) * Otherwise, this is a no-op */ u64 base = phys_initrd_start & PAGE_MASK; - u64 size = PAGE_ALIGN(phys_initrd_size); + u64 size = PAGE_ALIGN(phys_initrd_start + phys_initrd_size) - base;
/* * We can only add back the initrd memory if we don't end up