linux-kernel - Re: [PATCH] of: Check for phys_addr_t overflows in early_init_dt_add_memory

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Date:	Thu, 19 Jun 2014 09:31:17 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Laura Abbott <lauraa@...eaurora.org>
Cc:	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <rob.herring@...xeda.com>,
	devicetree-discuss <devicetree-discuss@...ts.ozlabs.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Simon Horman <horms@...ge.net.au>
Subject: Re: [PATCH] of: Check for phys_addr_t overflows in early_init_dt_add_memory_arch

Hi Laura,

On Thu, Jun 19, 2014 at 7:04 AM, Laura Abbott <lauraa@...eaurora.org> wrote:
> The common early_init_dt_add_memory_arch takes the base and size
> of a memory region as u64 types. The function never checks if
> the base and size can actually fit in a phys_addr_t which may
> be smaller than 64-bits. This may result in incorrect memory
> being passed to memblock_add if the memory falls outside the
> range of phys_addr_t. Add range checks for the base and size if
> phys_addr_t is smaller than u64.
>
> Reported-by: Geert Uytterhoeven <geert@...ux-m68k.org>
> Signed-off-by: Laura Abbott <lauraa@...eaurora.org>

Tested-by: Geert Uytterhoeven <geert@...ux-m68k.org>

> ---
> Geert, can you drop my other patch and give this a test to see if it fixes
> your bootup problem?

Thanks, works fine!

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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