linux-kernel - Re: [patch] ioremap sanity check to catch mapping requests exceeding the BAR sizes

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Date:	Sat, 27 Sep 2008 00:16:46 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Suresh Siddha <suresh.b.siddha@...el.com>
CC:	jbarnes@...tuousgeek.org, mingo@...e.hu, tglx@...utronix.de,
	hpa@...or.com, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, arjan@...ux.intel.com,
	linux-kernel@...r.kernel.org
Subject: Re: [patch] ioremap sanity check to catch mapping requests exceeding
 the BAR sizes

Suresh Siddha wrote:
> +int iomem_map_sanity_check(resource_size_t addr, unsigned long size)
> +{
> +	struct resource *p = &iomem_resource;
> +	int err = 0;
> +	loff_t l;
> +
> +	read_lock(&resource_lock);
> +	for (p = p->child; p ; p = r_next(NULL, p, &l)) {
> +		/*
> +		 * We can probably skip the resources with out
> +		 * IORESOURCE_IO attribute?
>   

Any attempt to use ioremap on memory is a bug, so you should warn about
that too.

> +		 */
> +		if (p->start >= addr + size)
> +			continue;
> +		if (p->end < addr)
> +			continue;
> +		if (p->start <= addr && (p->end >= addr + size - 1))
> +			continue;
> +		printk(KERN_WARNING "resource map sanity check conflict "
> +		       " 0x%llx 0x%llx 0x%llx 0x%llx %s\n",
> +		       addr, addr + size - 1, p->start, p->end, p->name);
> +		err = -1;
> +		break;
> +	}
> +	read_unlock(&resource_lock);
> +
> +	return err;

    J
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