linux-kernel - Re: [PATCH -tip v8 19/26] kprobes: Show blacklist entries via debugfs

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Message-ID: <20140324161909.5b8f854d@gandalf.local.home>
Date:	Mon, 24 Mar 2014 16:19:09 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
	Andi Kleen <andi@...stfloor.org>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Sandeepa Prabhu <sandeepa.prabhu@...aro.org>,
	Frederic Weisbecker <fweisbec@...il.com>, x86@...nel.org,
	fche@...hat.com, mingo@...hat.com, systemtap@...rceware.org,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH -tip v8 19/26] kprobes: Show blacklist entries via
 debugfs

On Wed, 05 Mar 2014 21:00:56 +0900
Masami Hiramatsu <masami.hiramatsu.pt@...achi.com> wrote:


>  kernel/kprobes.c |   61 +++++++++++++++++++++++++++++++++++++++++++++++-------
>  1 file changed, 53 insertions(+), 8 deletions(-)
> 
> diff --git a/kernel/kprobes.c b/kernel/kprobes.c
> index a21b4e6..3214289 100644
> --- a/kernel/kprobes.c
> +++ b/kernel/kprobes.c
> @@ -2249,6 +2249,46 @@ static const struct file_operations debugfs_kprobes_operations = {
>  	.release        = seq_release,
>  };
>  
> +/* kprobes/blacklist -- shows which functions can not be probed */
> +static void *kprobe_blacklist_seq_start(struct seq_file *m, loff_t *pos)
> +{
> +	return seq_list_start(&kprobe_blacklist, *pos);
> +}
> +
> +static void *kprobe_blacklist_seq_next(struct seq_file *m, void *v, loff_t *pos)
> +{
> +	return seq_list_next(v, &kprobe_blacklist, pos);
> +}
> +

Can modules use NOKPROBE_SYMBOL() and have items being added to the
list as this is being read? That is, do we need locks?

Also, are items removed. I need to go back and look at the
implementation of NOKPROBE_SYMBOL(), I'm just writing this as I think
about it ;-)

-- Steve
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