src/patches/suse-2.6.27.31/patches.arch/ppc-fix-ppc-insn-emulation_mr.patch

   1 Subject: Don't emulate mr. instructions
   2 From: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
   3 References: 459387 - LTC49903
   4
   5 Currently emulate_step() emulates mr. instructions without updating cr0
   6 and this can be disastrous. Don't emulate mr.
   7
   8 Signed-off-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
   9 Signed-off-by: Olaf Hering <olh@suse.de>
  10
  11 ---
  12  arch/powerpc/lib/sstep.c |    2 ++
  13  1 file changed, 2 insertions(+)
  14
  15 --- a/arch/powerpc/lib/sstep.c
  16 +++ b/arch/powerpc/lib/sstep.c
  17 @@ -172,6 +172,8 @@ int __kprobes emulate_step(struct pt_reg
  18                         }
  19                         break;
  20                 case 0x378:     /* orx */
  21 +                       if (instr & 1)
  22 +                               break;
  23                         rs = (instr >> 21) & 0x1f;
  24                         rb = (instr >> 11) & 0x1f;
  25                         if (rs == rb) {         /* mr */