linux-kernel - [PATCH -tip v4 0/4] x86: kprobes: Prohibit kprobes on Xen/KVM emulate prefixes

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Date:   Fri,  6 Sep 2019 22:13:37 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     Josh Poimboeuf <jpoimboe@...hat.com>,
        Andrew Cooper <andrew.cooper3@...rix.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        Borislav Petkov <bp@...en8.de>,
        Juergen Gross <jgross@...e.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Stefano Stabellini <sstabellini@...nel.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org, xen-devel@...ts.xenproject.org
Subject: [PATCH -tip v4 0/4] x86: kprobes: Prohibit kprobes on Xen/KVM emulate prefixes

Hi,

Here is the 4th version of patches to handle Xen/KVM emulate
prefix by x86 instruction decoder.

These patches allow x86 instruction decoder to decode
Xen and KVM emulate prefix correctly, and prohibit kprobes to
probe on it.
Previous version is here;

 https://lkml.kernel.org/r/156773433821.31441.2905951246664148487.stgit@devnote2

In this version, I added 2 patches, [1/4] fixes __ASM_FORM() to
accept macros using __stringify(), [2/4] introduces new
asm/emulate_prefix.h to initialize Xen and KVM emulate prefix
at one place. [3/4] is updated to use new emulate_prefix.h and
fix to add emulate_prefix.h to sync check list.

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 (4):
      x86/asm: Allow to pass macros to __ASM_FORM()
      x86: xen: kvm: Gather the definition of emulate prefixes
      x86: xen: insn: Decode Xen and KVM emulate-prefix signature
      x86: kprobes: Prohibit probing on instruction which has emulate prefix


 arch/x86/include/asm/asm.h                  |    8 ++++--
 arch/x86/include/asm/emulate_prefix.h       |   14 +++++++++++
 arch/x86/include/asm/insn.h                 |    6 +++++
 arch/x86/include/asm/xen/interface.h        |   11 +++------
 arch/x86/kernel/kprobes/core.c              |    4 +++
 arch/x86/kvm/x86.c                          |    4 ++-
 arch/x86/lib/insn.c                         |   34 +++++++++++++++++++++++++++
 tools/arch/x86/include/asm/emulate_prefix.h |   14 +++++++++++
 tools/arch/x86/include/asm/insn.h           |    6 +++++
 tools/arch/x86/lib/insn.c                   |   34 +++++++++++++++++++++++++++
 tools/objtool/sync-check.sh                 |    3 ++
 tools/perf/check-headers.sh                 |    3 ++
 12 files changed, 128 insertions(+), 13 deletions(-)
 create mode 100644 arch/x86/include/asm/emulate_prefix.h
 create mode 100644 tools/arch/x86/include/asm/emulate_prefix.h

--
Masami Hiramatsu (Linaro) <mhiramat@...nel.org>