linux-kernel - Re: [PATCH tip/master 1/3] kprobes: Support blacklist functions in module

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Date:	Fri, 17 Jul 2015 14:10:37 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	Pratyush Anand <panand@...hat.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...hat.com>, Rob Landley <rob@...dley.net>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH tip/master 1/3] kprobes: Support blacklist functions in
 module


* Masami Hiramatsu <masami.hiramatsu.pt@...achi.com> wrote:

> To blacklist the functions in a module (e.g. user-defined
> kprobe handler and the functions invoked from it), expand
> blacklist support for modules.
> With this change, users can use NOKPROBE_SYMBOL() macro in
> their own modules.

Btw., whatever happened with renaming '__kprobes' to '__nokprobe' and using that 
consistently to blacklist certain functions?

Also, shouldn't we convert such instances:

	static int notifier_call_chain(struct notifier_block **nl,
                               unsigned long val, void *v,
                               int nr_to_call, int *nr_calls)

	...

	NOKPROBE_SYMBOL(notifier_call_chain);

to:

	static int __nokprobe notifier_call_chain(struct notifier_block **nl,
                               unsigned long val, void *v,
                               int nr_to_call, int *nr_calls)

?

I.e. instead of extending it to modules we should eliminate NOKPROBE_SYMBOL() in 
favor of marking functions as __nokprobe which is the standard syntax for marking 
functions.

Thanks,

	Ingo
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