linux-kernel - Re: [v4.13 regression] ARM: zImage: Fix stack overflow in merge_fdt

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Date:   Wed, 19 Jul 2017 11:12:51 +0200
From:   Sebastian Reichel <sebastian.reichel@...labora.co.uk>
To:     Pavel Machek <pavel@....cz>
Cc:     Rask Ingemann Lambertsen <rask@...melder.dk>,
        Russell King <linux@...linux.org.uk>,
        Richard Genoud <richard.genoud@...il.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        nico@...aro.org, gregory.clement@...e-electrons.com,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [v4.13 regression] ARM: zImage: Fix stack overflow in
 merge_fdt_bootargs()

Hi,

On Wed, Jul 19, 2017 at 10:47:27AM +0200, Sebastian Reichel wrote:
> On Wed, Jul 19, 2017 at 10:15:36AM +0200, Pavel Machek wrote:
> > > This function is called very early on from head.S and currently sets up a
> > > stack frame of more than 1024 bytes:
> > > 
> > > atags_to_fdt.c: In function ‘merge_fdt_bootargs’:
> > > atags_to_fdt.c:98:1: warning: the frame size of 1032 bytes is larger than 1024 bytes [-Wframe-larger-than=]
> > > 
> > > This causes a crash and failure to boot with some combinations of kernel
> > > version, gcc version and dtb, such as kernel version 4.1-rc1 of 4.1.0,
> > > gcc version 5.4.1 20161019 (Debian 5.4.1-3) and tegra20-trimslice.dtb.
> > 
> > > 
> > > Signed-off-by: Rask Ingemann Lambertsen <rask@...melder.dk>
> > > Fixes: d0f34a11ddab ("ARM: 7437/1: zImage: Allow DTB command line concatenation with ATAG_CMDLINE")
> > 
> > I tested that it does not break boot on N900. I hoped that it would
> > fix boot on N950 (but no luck there so far).
> > 
> > Tested-by: Pavel Machek <pavel@....cz>
> > 
> > AFAICT this is regression in v4.13-rc1. Thus it is quite surprising
> > that there are no comments here.
> 
> No, it's not. I definitely saw the warning before (and see it now)
> and images can be booted on all of the phones I'm working on (i.e.
> N900, N950, Droid 4).
> 
> Anyawys thanks for fixing this properly. I will add the patch to my
> dev branch and give it a test during the day.

It does work for me.

Tested-by: Sebastian Reichel <sebastian.reichel@...labora.co.uk>

-- Sebastian

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