From eef336189b2b5ae68bfbef0df24176a4a152d981 Mon Sep 17 00:00:00 2001 From: Ananth N Mavinakayanahalli Date: Fri, 6 Feb 2009 02:02:00 +0000 Subject: [PATCH] powerpc: Don't emulate mr. instructions Currently emulate_step() emulates mr. instructions without updating cr0 and this can be disastrous. Don't emulate mr. This bug has been around for a while, but I am not sure if its a worthy -stable candidate. I'll leave it to Ben do decide. Signed-off-by: Ananth N Mavinakayanahalli Signed-off-by: Benjamin Herrenschmidt --- arch/powerpc/lib/sstep.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/powerpc/lib/sstep.c b/arch/powerpc/lib/sstep.c index 4aae0c387645..13b7d54f185b 100644 --- a/arch/powerpc/lib/sstep.c +++ b/arch/powerpc/lib/sstep.c @@ -172,6 +172,8 @@ int __kprobes emulate_step(struct pt_regs *regs, unsigned int instr) } break; case 0x378: /* orx */ + if (instr & 1) + break; rs = (instr >> 21) & 0x1f; rb = (instr >> 11) & 0x1f; if (rs == rb) { /* mr */ -- 2.20.1