linux-kernel - Re: [PATCHv2] of: Check for phys_addr_t overflows in early_init_dt_add_memory

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Date:	Thu, 19 Jun 2014 23:33:27 -0400 (EDT)
From:	Nicolas Pitre <nicolas.pitre@...aro.org>
To:	Laura Abbott <lauraa@...eaurora.org>
cc:	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robherring2@...il.com>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCHv2] of: Check for phys_addr_t overflows in
 early_init_dt_add_memory_arch

On Thu, 19 Jun 2014, Laura Abbott 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>
> Tested-by: Geert Uytterhoeven <geert@...ux-m68k.org>
> Signed-off-by: Laura Abbott <lauraa@...eaurora.org>

Acked-by: Nicolas Pitre <nico@...aro.org>

> ---
> v2: Switched to sizeof(phys_addr_t) < sizeof(u64) instead of macros.
> Sending to right e-mails/mailing lists this time.
> 
>  drivers/of/fdt.c | 15 +++++++++++++++
>  1 file changed, 15 insertions(+)
> 
> diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
> index c4cddf0..b777d8f 100644
> --- a/drivers/of/fdt.c
> +++ b/drivers/of/fdt.c
> @@ -880,6 +880,21 @@ void __init __weak early_init_dt_add_memory_arch(u64 base, u64 size)
>  	const u64 phys_offset = __pa(PAGE_OFFSET);
>  	base &= PAGE_MASK;
>  	size &= PAGE_MASK;
> +
> +	if (sizeof(phys_addr_t) < sizeof(u64)) {
> +		if (base > ULONG_MAX) {
> +			pr_warning("Ignoring memory block 0x%llx - 0x%llx\n",
> +					base, base + size);
> +			return;
> +		}
> +
> +		if (base + size > ULONG_MAX) {
> +			pr_warning("Ignoring memory range 0x%lx - 0x%llx\n",
> +					ULONG_MAX, base + size);
> +			size = ULONG_MAX - base;
> +		}
> +	}
> +
>  	if (base + size < phys_offset) {
>  		pr_warning("Ignoring memory block 0x%llx - 0x%llx\n",
>  			   base, base + size);
> -- 
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> hosted by The Linux Foundation
> 
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