Re: [PATCH] Add user taint flag

[Nick Piggin]

Theodore Tso wrote:

> +struct page *rmem_vma_nopage(struct vm_area_struct *vma,
> +                unsigned long address, int *type)
> +{
> +	struct page *pageptr;
> +	unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
> +	unsigned long physaddr = address - vma->vm_start + offset;
> +	unsigned long pageframe = physaddr >> PAGE_SHIFT;
> +
> +	if (!pfn_valid(pageframe))
> +		return NOPAGE_SIGBUS;
> +	pageptr = pfn_to_page(pageframe);
> +	get_page(pageptr);
> +	if (type)
> +		*type = VM_FAULT_MINOR;
> +	return pageptr;
> +}

This won't work because struct page could easily be a free page.

I think /dev/mem should be able to remap physical memory now that
PG_reserved is gone.

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