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

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Message-ID: <20150721074847.GA25542@gmail.com>
Date:	Tue, 21 Jul 2015 09:48:47 +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:

> For some symbols we can do that. But it can conflict with other __section
> attributes e.g. __sched, since a function must be placed in only one
> section. [...]

The the scheduler is not modular, so __sched should not be a problem in itself.

> [...] So, IMHO, using section for expressing its attribute is not a good idea, 
> but I couldn't find another option in common function attribute.
> 
> https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#Common-Function-Attributes
> 
> Thus I've introduced NOKPROBE_SYMBOL macro which stores the target function
> addresses (not the function itself) in the _kprobe_blacklist section.

So the question is, in which cases do modules need this?

Thanks,

	Ingo
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