Re: [PATCH] arm64: fix address fault during mapping fdt region

On Mon, Aug 01, 2016 at 05:42:19PM +0800, zijun_hu wrote:

quoted

From 07b9216ec3494515e7a6c41e0333eb8782427db3 Mon Sep 17 00:00:00 2001

From: zijun_hu <redacted>
Date: Mon, 1 Aug 2016 17:04:59 +0800
Subject: [PATCH] arm64: fix address fault during mapping fdt region

fdt_check_header() accesses other fileds of fdt header but
the first 8 bytes such as version; so accessing unmapped
address fault happens if fdt region locates below align
boundary nearly during mapping fdt region, or expressed as
(offset + sizeof(struct fdt_header)) > SWAPPER_BLOCK_SIZE

fdt header size at least is mapped in order to avoid the issue

Signed-off-by: zijun_hu <redacted>
---
 arch/arm64/mm/mmu.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

<formletter>

This is not the correct way to submit patches for inclusion in the
stable kernel tree.  Please read Documentation/stable_kernel_rules.txt
for how to do this properly.

</formletter>