Re: [RESEND PATCH] x86: add phys addr validity check for /dev/memmmap

[H. Peter Anvin]

On 10/02/2013 09:05 AM, Frantisek Hrbata wrote:
> +
> +int valid_phys_addr_range(phys_addr_t addr, size_t count)
> +{
> +	return addr + count <= __pa(high_memory);
> +}
> +
> +int valid_mmap_phys_addr_range(unsigned long pfn, size_t count)
> +{
> +	resource_size_t addr = (pfn << PAGE_SHIFT) + count;
> +	return phys_addr_valid(addr);
> +}
> 

The latter has overflow problems.

The former I realize matches the current /dev/mem, but it is still just
plain wrong in multiple ways.

	-hpa

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