linux-kernel - [119/205] ARM: 6226/1: fix kprobe bug in ldr instruction emulation

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Message-Id: <20100730175144.757805894@clark.site>
Date:	Fri, 30 Jul 2010 10:52:16 -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,
	Bin Yang <bin.yang@...vell.com>,
	Nicolas Pitre <nicolas.pitre@...aro.org>,
	Russell King <rmk+kernel@....linux.org.uk>
Subject: [119/205] ARM: 6226/1: fix kprobe bug in ldr instruction emulation

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

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

From: Nicolas Pitre <nico@...xnic.net>

commit 0ebe25f90cd99bb1bcf622ec8a841421d48380d6 upstream.

From: Bin Yang <bin.yang@...vell.com>

Signed-off-by: Bin Yang <bin.yang@...vell.com>
Signed-off-by: Nicolas Pitre <nicolas.pitre@...aro.org>
Signed-off-by: Russell King <rmk+kernel@....linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 arch/arm/kernel/kprobes-decode.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/arch/arm/kernel/kprobes-decode.c
+++ b/arch/arm/kernel/kprobes-decode.c
@@ -583,13 +583,14 @@ static void __kprobes emulate_ldr(struct
 {
 	insn_llret_3arg_fn_t *i_fn = (insn_llret_3arg_fn_t *)&p->ainsn.insn[0];
 	kprobe_opcode_t insn = p->opcode;
+	long ppc = (long)p->addr + 8;
 	union reg_pair fnr;
 	int rd = (insn >> 12) & 0xf;
 	int rn = (insn >> 16) & 0xf;
 	int rm = insn & 0xf;
 	long rdv;
-	long rnv  = regs->uregs[rn];
-	long rmv  = regs->uregs[rm]; /* rm/rmv may be invalid, don't care. */
+	long rnv = (rn == 15) ? ppc : regs->uregs[rn];
+	long rmv = (rm == 15) ? ppc : regs->uregs[rm];
 	long cpsr = regs->ARM_cpsr;
 
 	fnr.dr = insnslot_llret_3arg_rflags(rnv, 0, rmv, cpsr, i_fn);


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