[patch 071/149] ARM: 6166/1: Proper prefetch abort handling on pre-ARMv6

[Greg KH]

2.6.32-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Anfei <anfei.zhou@xxxxxxxxx>

commit 5e27fb78df95e027723af2c90ecc9b4527ae59e9 upstream.

Instruction faults on pre-ARMv6 CPUs are interpreted as
a 'translation fault', but do_translation_fault doesn't
handle well if user mode trying to run instruction above
TASK_SIZE, and result in the infinite retry of that
instruction.

Signed-off-by: Anfei Zhou <anfei.zhou@xxxxxxxxx>
Signed-off-by: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 arch/arm/mm/fault.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/arch/arm/mm/fault.c
+++ b/arch/arm/mm/fault.c
@@ -386,6 +386,9 @@ do_translation_fault(unsigned long addr,
 	if (addr < TASK_SIZE)
 		return do_page_fault(addr, fsr, regs);
 
+	if (user_mode(regs))
+		goto bad_area;
+
 	index = pgd_index(addr);
 
 	/*


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