linux-kernel - Re: How about limiting refresh ioctl to sampling events ?

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 23 Nov 2010 14:07:26 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Franck Bui-Huu <vagabon.xyz@...il.com>
Cc:	lkml <linux-kernel@...r.kernel.org>
Subject: Re: How about limiting refresh ioctl to sampling events ?

On Tue, 2010-11-23 at 14:01 +0100, Franck Bui-Huu wrote:
> Hello Peter,
> 
> I'm looking at the perf event stuff and wondering if
> perf_event_refresh() should be limited to sampling events.
> 
> Does the following make sense ?
> 
> diff --git a/kernel/perf_event.c b/kernel/perf_event.c
> index 3b105e0..1a90a6c 100644
> --- a/kernel/perf_event.c
> +++ b/kernel/perf_event.c
> @@ -1072,7 +1072,7 @@ static int perf_event_refresh(struct perf_event *event, int refresh)
>  	/*
>  	 * not supported on inherited events
>  	 */
> -	if (event->attr.inherit)
> +	if (event->attr.inherit || !event->attr.sample_period)
>  		return -EINVAL;
>  
>  	atomic_add(refresh, &event->event_limit);

Yes it does, please submit as a proper patch.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/