linux-kernel - Re: [PATCH 2/2] ARM: zynq: Use memcpy_toio instead of memcpy on smp bring-up

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Message-ID: <20190806051717.GC8525@kroah.com>
Date:   Tue, 6 Aug 2019 07:17:17 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Luis Araneda <luaraneda@...il.com>
Cc:     linux@...linux.org.uk, michal.simek@...inx.com,
        stable@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] ARM: zynq: Use memcpy_toio instead of memcpy on smp
 bring-up

On Mon, Aug 05, 2019 at 11:07:18PM -0400, Luis Araneda wrote:
> This fixes a kernel panic (read overflow) on memcpy when
> FORTIFY_SOURCE is enabled.
> 
> The computed size of memcpy args are:
> - p_size (dst): 4294967295 = (size_t) -1
> - q_size (src): 1
> - size (len): 8
> 
> Additionally, the memory is marked as __iomem, so one of
> the memcpy_* functions should be used for read/write
> 
> Signed-off-by: Luis Araneda <luaraneda@...il.com>
> ---
>  arch/arm/mach-zynq/platsmp.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

<formletter>

This is not the correct way to submit patches for inclusion in the
stable kernel tree.  Please read:
    https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html
for how to do this properly.

</formletter>