lkml.org 
[lkml]   [2006]   [May]   [22]   [last100]   RSS Feed
Views: [more markup]  [less markup]  [headers]  [forward] 
 
Messages in this thread
/
DateTue, 23 May 2006 09:49:20 +1000
FromNick Piggin <>
SubjectRe: [PATCH] Add user taint flag
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.

--

Send instant messages to your online friends http://au.messenger.yahoo.com 

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2006-05-23 01:51    [from the cache]
©2003-2008