Re: [PATCH] Add user taint flag

[Nick Piggin <nickpiggin@yahoo.com.au>]

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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