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

Masami Hiramatsu
2019-09-04T11:45:56Z

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@kernel.org>