linux-kernel - Re: Detecting kprobes generated code addresses

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Message-Id: <20161225121320.b1ee82377e744805ffe47f7f@kernel.org>
Date:   Sun, 25 Dec 2016 12:13:20 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org
Subject: Re: Detecting kprobes generated code addresses

On Thu, 22 Dec 2016 00:42:19 -0600
Josh Poimboeuf <jpoimboe@...hat.com> wrote:

> Hi Masami,
> 
> I would like to make __kernel_text_address() be able to detect whether
> an address belongs to code which was generated by kprobes.  As far as I
> can tell, that information seems to be in the 'pages' lists of
> kprobe_insn_slots and kprobe_optinsn_slots.  But they seem to be
> protected by mutexes.

Right. It is currently under mutex because it may kick
page allocation. But I think it is easy to fix that :)

>  Do you know if there's a sleep-free way to access
> that information?

Hmm, no, I couldn't find that yet.

Thanks,

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