linux-kernel - Re: Re: [PATCH -tip v4 0/6] kprobes: introduce NOKPROBE

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Message-ID: <529FBB7D.3030100@hitachi.com>
Date:	Thu, 05 Dec 2013 08:32:13 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Sandeepa Prabhu <sandeepa.prabhu@...aro.org>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	x86@...nel.org, lkml <linux-kernel@...r.kernel.org>,
	"Steven Rostedt (Red Hat)" <rostedt@...dmis.org>,
	systemtap@...rceware.org, "David S. Miller" <davem@...emloft.net>
Subject: Re: Re: [PATCH -tip v4 0/6] kprobes: introduce NOKPROBE_SYMBOL()
 and fixes crash bugs

(2013/12/04 17:46), Sandeepa Prabhu wrote:
> On 4 December 2013 13:09, Masami Hiramatsu
> <masami.hiramatsu.pt@...achi.com> wrote:
>> (2013/12/04 11:54), Sandeepa Prabhu wrote:
>>> On 4 December 2013 06:58, Masami Hiramatsu
>>> <masami.hiramatsu.pt@...achi.com> wrote:
>>>> Hi,
>>>> Here is the version 4 of NOKPORBE_SYMBOL series.
>>>>
>>>> In this version, I removed the cleanup patches and
>>>> add bugfixes I've found, since those bugs will be
>>>> critical.
>>>> Rest of the cleanup and visible blacklists will be
>>>> proposed later in another series.
>>>>
>>>> Oh, just one new thing, I added a new RFC patch which
>>>> removes the dependency of notify_die() from kprobes
>>>> miss-hit/recovery path. Since the notify_die() involves
>>>> locking and lockdep code which invokes a lot of heavy
>>>> printk functions etc. This helped me to minimize the
>>>> blacklist and provides more stability for kprobes.
>>>> Actually, most of int3 handlers are already called
>>>> from do_int3 directly, I think this change is acceptable
>>>> too.
>>>>
>>>> Here is the updates about NOKPROBE_SYMBOL().
>>>>  - Now _ASM_NOKPROBE() macro is introduced for assembly
>>>>    symbols on x86.
>>>>  - Rename kprobe_blackpoint to kprobe_blacklist_entry
>>>>    and simplify it. Also NOKPROBE_SYMBOL() macro just
>>>>    saves the address of non-probe-able symbols.
>>>>
>>>> ---
>>>>
>>>> Masami Hiramatsu (6):
>>>
>>>>       kprobes: Prohibit probing on .entry.text code
>>>>       kprobes: Introduce NOKPROBE_SYMBOL() macro for blacklist
>>> Hi Masami,
>>> Is it good idea to split  "arch/x86" code from generic kernel changes?
>>> Then we just need to take above two patches for verifying it on arm64
>>> or other platforms.
>>
>> Yeah, it can be.
>> However I think you can apply it without any problem on arm64 tree too,
>> since it "just adds" an asm macro in arch/x86/include/asm/asm.h.
>> It should not have any effect for other arch. Could you try it? :)
> Hmm, for the second patch, git am failed with: "error: patch failed:
> kernel/sched/core.c:2662",
> manually patched to resolve it.  aarch64 tree is right now at Linux 3.13-rc2.

Ah I see, that must be changed because it is the change related to introducing
new blacklist itself. It is not solved by splitting arch/x86 change.

Thank you,

-- 
Masami HIRAMATSU
IT Management Research Dept. Linux Technology Center
Hitachi, Ltd., Yokohama Research Laboratory
E-mail: masami.hiramatsu.pt@...achi.com


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