linux-kernel - [107/200] ARM: 6166/1: Proper prefetch abort handling on pre-ARMv6

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Message-Id: <20100701174255.462179336@clark.site>
Date:	Thu, 01 Jul 2010 10:43:17 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Anfei Zhou <anfei.zhou@...il.com>,
	Russell King <rmk+kernel@....linux.org.uk>
Subject: [107/200] ARM: 6166/1: Proper prefetch abort handling on pre-ARMv6

2.6.34-stable review patch.  If anyone has any objections, please let me know.

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

From: Anfei <anfei.zhou@...il.com>

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@...il.com>
Signed-off-by: Russell King <rmk+kernel@....linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

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

--- a/arch/arm/mm/fault.c
+++ b/arch/arm/mm/fault.c
@@ -393,6 +393,9 @@ 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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