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From: Peter Zijlstra <peterz@infradead.org>
To: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Ingo Molnar <mingo@kernel.org>,
	Josh Poimboeuf <jpoimboe@redhat.com>,
	Randy Dunlap <rdunlap@infradead.org>,
	Borislav Petkov <bp@alien8.de>, Juergen Gross <jgross@suse.com>,
	Boris Ostrovsky <boris.ostrovsky@oracle.com>,
	Stefano Stabellini <sstabellini@kernel.org>,
	x86@kernel.org, linux-kernel@vger.kernel.org,
	xen-devel@lists.xenproject.org
Subject: Re: [PATCH -tip 0/2] x86: Prohibit kprobes on XEN_EMULATE_PREFIX
Date: Wed, 4 Sep 2019 14:02:32 +0200	[thread overview]
Message-ID: <20190904120232.GH2349@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <156759754770.24473.11832897710080799131.stgit@devnote2>

On Wed, Sep 04, 2019 at 08:45:47PM +0900, Masami Hiramatsu wrote:
> 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

Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>

      parent reply	other threads:[~2019-09-04 12:02 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-04 11:45 Masami Hiramatsu
2019-09-04 11:45 ` [PATCH -tip 1/2] x86: xen: insn: Decode XEN_EMULATE_PREFIX correctly Masami Hiramatsu
2019-09-04 11:46 ` [PATCH -tip 2/2] x86: kprobes: Prohibit probing on instruction which has Xen prefix Masami Hiramatsu
2019-09-04 11:54 ` [Xen-devel] [PATCH -tip 0/2] x86: Prohibit kprobes on XEN_EMULATE_PREFIX Andrew Cooper
2019-09-05  1:49   ` Masami Hiramatsu
2019-09-05  7:54     ` Andrew Cooper
2019-09-05  8:26       ` Peter Zijlstra
2019-09-05  8:53         ` Andrew Cooper
2019-09-05  9:26           ` Peter Zijlstra
2019-09-05  9:38             ` Andrew Cooper
2019-09-05 12:49           ` [OT] " Masami Hiramatsu
2019-09-05 11:32       ` Masami Hiramatsu
2019-09-05 13:09         ` Masami Hiramatsu
2019-09-05 13:31           ` Andrew Cooper
2019-09-05 16:12             ` Masami Hiramatsu
2019-09-04 12:02 ` Peter Zijlstra [this message]

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