From: masami.hiramatsu.pt@hitachi•com (Masami Hiramatsu)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH RFC 2/6] arm64: Kprobes with single stepping support
Date: Thu, 14 Nov 2013 01:05:23 +0900 [thread overview]
Message-ID: <5283A343.1000305@hitachi.com> (raw)
In-Reply-To: <20131112115935.23d05236@gandalf.local.home>
(2013/11/13 1:59), Steven Rostedt wrote:
> On Tue, 12 Nov 2013 16:25:26 +0530
> Sandeepa Prabhu <sandeepa.prabhu@linaro•org> wrote:
>
>
>>>
>>> BTW, I'm currently trying a general housecleaning of __kprobes
>>> annotations. It may also have impact on your patch.
>>> https://lkml.org/lkml/2013/11/8/187
>> Hmm, we can help testing your patchset on arm64 platforms. Also have
>> many doubts on the changes you are working [blacklisting probes etc]
>>
>> Basically I had tried placing kprobe on memcpy() and the model hung
>> (insmod never returned back!). Fast-model I have does not have option
>> of any debug so no clue what happened!.
>> memcpy() is low-level call being used internally within kprobes, so
>> probably we cannot handle probe on that routine, but then how to make
>> sure all such API are rejected by kprobe sub-system ?
>
> Working on ports of ftrace, I found that many of the functions in lib/
> are used by several locations that just can't be traced, due to how
> low level they are. I just simply blacklisted the entire lib/
> directory (See the top of lib/Makefile)
>
> I wonder if there's an easy way to blacklist entire directories from
> being used by kprobes too. Or at least do it by a file per file basis.
Hm, perhaps we can do some magic in post-build script as kallsyms does.
1) make an object file
2) extract symbols from the file
3) put the symbols into data section as a list of strings
4) analyze the list at boot (init) time by using kallsyms
how about this? :)
Thank you,
--
Masami HIRAMATSU
IT Management Research Dept. Linux Technology Center
Hitachi, Ltd., Yokohama Research Laboratory
E-mail: masami.hiramatsu.pt at hitachi.com
next prev parent reply other threads:[~2013-11-13 16:05 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-10-17 11:17 [PATCH RFC v2 0/6] ARM64: Add kernel probes(Kprobes) support Sandeepa Prabhu
2013-10-17 11:17 ` [PATCH RFC v4 1/6] arm64: support single-step and breakpoint handler hooks Sandeepa Prabhu
2013-10-25 15:22 ` Will Deacon
2013-12-03 14:33 ` Sandeepa Prabhu
2013-12-03 19:44 ` Will Deacon
2013-10-17 11:17 ` [PATCH RFC 2/6] arm64: Kprobes with single stepping support Sandeepa Prabhu
2013-11-08 16:56 ` Will Deacon
2013-11-09 9:10 ` Masami Hiramatsu
2013-11-11 5:39 ` Sandeepa Prabhu
2013-11-11 7:54 ` Masami Hiramatsu
2013-11-11 10:51 ` Masami Hiramatsu
2013-11-11 10:58 ` Will Deacon
2013-11-11 17:32 ` Masami Hiramatsu
2013-11-12 6:23 ` Sandeepa Prabhu
2013-11-12 7:27 ` Masami Hiramatsu
2013-11-12 8:44 ` Sandeepa Prabhu
2013-11-12 10:17 ` Masami Hiramatsu
2013-11-12 10:55 ` Sandeepa Prabhu
2013-11-12 14:11 ` Masami Hiramatsu
2013-11-12 16:59 ` Steven Rostedt
2013-11-13 16:05 ` Masami Hiramatsu [this message]
[not found] ` <CA+b37P1sNsEXrJFfVL51sZ-SeGNCBiwXnOwCiFY8CBwSXPw+mQ@mail.gmail.com>
2013-11-13 7:08 ` Sandeepa Prabhu
2013-11-13 14:07 ` Masami Hiramatsu
2013-11-13 14:31 ` Will Deacon
2013-11-13 15:55 ` Sandeepa Prabhu
2013-11-15 16:39 ` Will Deacon
2013-11-18 6:55 ` Sandeepa Prabhu
2013-11-18 8:51 ` Sandeepa Prabhu
2013-11-13 13:58 ` Peter Zijlstra
2013-11-13 14:20 ` Will Deacon
2013-11-11 5:35 ` Sandeepa Prabhu
2013-11-11 11:21 ` Will Deacon
2013-11-12 6:52 ` Sandeepa Prabhu
2013-11-15 16:37 ` Will Deacon
2013-11-18 6:43 ` Sandeepa Prabhu
2013-10-17 11:17 ` [PATCH RFC 3/6] arm64: Kprobes instruction simulation support Sandeepa Prabhu
2013-11-08 17:03 ` Will Deacon
2013-11-11 5:58 ` Sandeepa Prabhu
2013-10-17 11:17 ` [PATCH RFC 4/6] arm64: Add kernel return probes support(kretprobes) Sandeepa Prabhu
2013-11-08 17:04 ` Will Deacon
2013-11-11 4:29 ` Sandeepa Prabhu
2013-11-11 7:53 ` AKASHI Takahiro
2013-11-11 8:55 ` Sandeepa Prabhu
2013-10-17 11:17 ` [PATCH RFC 5/6] arm64: Enable kprobes support for arm64 platform Sandeepa Prabhu
2013-10-17 11:17 ` [PATCH RFC 6/6] kprobes: Add cases for arm and arm64 in sample module Sandeepa Prabhu
2013-10-25 15:24 ` Will Deacon
2013-11-06 11:05 ` Sandeepa Prabhu
2013-10-18 8:32 ` [PATCH RFC v2 0/6] ARM64: Add kernel probes(Kprobes) support Masami Hiramatsu
2013-10-21 4:17 ` Sandeepa Prabhu
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