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 <ana...@in.ibm.com>
---
arch/powerpc/lib/sstep.c | 2 ++
1 file changed, 2 insertions(+)
Index: linux-2.6.29-rc3/arch/powerpc/lib/sstep.c
===================================================================
--- linux-2.6.29-rc3.orig/arch/powerpc/lib/sstep.c
+++ linux-2.6.29-rc3/arch/powerpc/lib/sstep.c
@@ -172,6 +172,8 @@ int __kprobes emulate_step(struct pt_reg
}
break;
case 0x378: /* orx */
+ if (instr & 1)
+ break;
rs = (instr >> 21) & 0x1f;
rb = (instr >> 11) & 0x1f;
if (rs == rb) { /* mr */
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