[PATCH -tip 0/2] x86: Prohibit kprobes on XEN_EMULATE_PREFIX

[Masami Hiramatsu]

Hi,

These patches allow x86 instruction decoder to decode
xen-cpuid which has XEN_EMULATE_PREFIX, and prohibit
kprobes to probe on it.

Josh reported that the objtool can not decode such special
prefixed instructions, and I found that we also have to
prohibit kprobes to probe on such instruction.

This series can be applied on -tip master branch which
has merged Josh's objtool/perf sharing common x86 insn
decoder series.


Thank you,

---

Masami Hiramatsu (2):
      x86: xen: insn: Decode XEN_EMULATE_PREFIX correctly
      x86: kprobes: Prohibit probing on instruction which has Xen prefix


 arch/x86/include/asm/insn.h             |    2 +
 arch/x86/include/asm/xen/interface.h    |    7 ++++-
 arch/x86/include/asm/xen/prefix.h       |   10 +++++++
 arch/x86/kernel/kprobes/core.c          |    4 +++
 arch/x86/lib/insn.c                     |   43 +++++++++++++++++++++++++++++++
 tools/arch/x86/include/asm/insn.h       |    2 +
 tools/arch/x86/include/asm/xen/prefix.h |   10 +++++++
 tools/arch/x86/lib/insn.c               |   43 +++++++++++++++++++++++++++++++
 tools/objtool/sync-check.sh             |    3 +-
 9 files changed, 121 insertions(+), 3 deletions(-)
 create mode 100644 arch/x86/include/asm/xen/prefix.h
 create mode 100644 tools/arch/x86/include/asm/xen/prefix.h

--
Masami Hiramatsu (Linaro) <mhiramat@xxxxxxxxxx>