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[PATCH] x86_64: When checking vmalloc mappings don't use pte_page 

The PTEs can point to ioremap mappings too, and these are often outside
mem_map.  The NUMA hash page lookup functions cannot handle out of bounds
accesses properly.

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Andi Kleen 2005-05-16 21:53:31 -07:00 committed by Linus Torvalds
parent f6b8d4778c
commit 3b9ba4d5e2
1 changed files with 9 additions and 2 deletions
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11
arch/x86_64/mm/fault.c
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@ -234,6 +234,8 @@ static noinline void pgtable_bad(unsigned long address, struct pt_regs *regs,
/*
* Handle a fault on the vmalloc or module mapping area
*
* This assumes no large pages in there.
*/
static int vmalloc_fault(unsigned long address)
{
@ -272,7 +274,10 @@ static int vmalloc_fault(unsigned long address)
if (!pte_present(*pte_ref))
return -1;
pte = pte_offset_kernel(pmd, address);
if (!pte_present(*pte) || pte_page(*pte) != pte_page(*pte_ref))
/* Don't use pte_page here, because the mappings can point
outside mem_map, and the NUMA hash lookup cannot handle
that. */
if (!pte_present(*pte) || pte_pfn(*pte) != pte_pfn(*pte_ref))
BUG();
__flush_tlb_all();
return 0;
@ -346,7 +351,9 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long error_code)
* protection error (error_code & 1) == 0.
*/
if (unlikely(address >= TASK_SIZE)) {
if (!(error_code & 5)) {
if (!(error_code & 5) &&
((address >= VMALLOC_START && address < VMALLOC_END) ||
(address >= MODULES_VADDR && address < MODULES_END))) {
if (vmalloc_fault(address) < 0)
goto bad_area_nosemaphore;
return;