linux-kernel - [PATCH 0/2] uprobes: kprobes: x86: Reject probing MOV SS/POP SS

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Date:   Wed, 9 May 2018 22:01:54 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     x86@...nel.org, LKML <linux-kernel@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Oleg Nesterov <oleg@...hat.com>,
        Ingo Molnar <mingo@...nel.org>,
        Andy Lutomirski <luto@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H . Peter Anvin" <hpa@...or.com>,
        Alexei Starovoitov <ast@...nel.org>,
        "David S . Miller" <davem@...emloft.net>,
        Steven Rostedt <rostedt@...dmis.org>,
        Francis Deslauriers <francis.deslauriers@...icios.com>,
        Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>,
        Borislav Petkov <bp@...e.de>, Yonghong Song <yhs@...com>
Subject: [PATCH 0/2] uprobes: kprobes: x86: Reject probing MOV SS/POP SS


Oops, I missed adding kprobes: and POP SS on subject...
	

On Wed,  9 May 2018 21:57:44 +0900
Masami Hiramatsu <mhiramat@...nel.org> wrote:

> Hi,
> 
> I found the CVE-2018-1087 and CVE-2018-8897 should
> be related to kprobes and uprobes too, since both
> are using #DB for single stepping.
> 
> I decided to just reject probes on MOV SS and POP SS
> because those are not recommended to use (Intel SDM
> recommend to use LSS instead), thus it might be
> rare case.
>
> Oleg, could you review the uprobes patch?
> 
> Thank you,
> 
> ---
> 
> Masami Hiramatsu (2):
>       kprobes: x86: Prohibit probing on exception masking instructions
>       uprobes: x86: Prohibit probing on MOV SS instruction
> 
> 
>  arch/x86/include/asm/insn.h    |   18 ++++++++++++++++++
>  arch/x86/kernel/kprobes/core.c |    4 ++++
>  arch/x86/kernel/uprobes.c      |    4 ++++
>  3 files changed, 26 insertions(+)
> 
> --
> Masami Hiramatsu (Linaro) <mhiramat@...nel.org>


-- 
Masami Hiramatsu <mhiramat@...nel.org>