linux-kernel - Re: [PATCH 1/1] power: validate wakeup source before activating it.

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:	Fri, 15 May 2015 02:22:01 +0200
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Jin Qian <jinqian@...roid.com>
Cc:	Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] power: validate wakeup source before activating it.

On Wednesday, May 06, 2015 03:26:56 PM Jin Qian wrote:
> A rogue wakeup source not registered in wakeup_sources list is not visible
> from wakeup_sources_stats_show. Check if the wakeup source is registered
> properly by looking at the timer struct.
> 
> Signed-off-by: Jin Qian <jinqian@...roid.com>
> ---
>  drivers/base/power/wakeup.c | 18 ++++++++++++++++++
>  1 file changed, 18 insertions(+)
> 
> diff --git a/drivers/base/power/wakeup.c b/drivers/base/power/wakeup.c
> index 7726200..7b5ad9a 100644
> --- a/drivers/base/power/wakeup.c
> +++ b/drivers/base/power/wakeup.c
> @@ -351,6 +351,20 @@ int device_set_wakeup_enable(struct device *dev, bool enable)
>  }
>  EXPORT_SYMBOL_GPL(device_set_wakeup_enable);
>  
> +/**
> + * wakeup_source_not_registered - validate the given wakeup source.
> + * @ws: Wakeup source to be validated.
> + */
> +static bool wakeup_source_not_registered(struct wakeup_source *ws)
> +{
> +	/*
> +	 * Use timer struct to check if the given source is initialized
> +	 * by wakeup_source_add.
> +	 */
> +	return ws->timer.function != pm_wakeup_timer_fn ||
> +		   ws->timer.data != (unsigned long)ws;
> +}
> +
>  /*
>   * The functions below use the observation that each wakeup event starts a
>   * period in which the system should not be suspended.  The moment this period
> @@ -391,6 +405,10 @@ static void wakeup_source_activate(struct wakeup_source *ws)
>  {
>  	unsigned int cec;
>  
> +	if (WARN_ONCE(wakeup_source_not_registered(ws),
> +			"unregistered wakeup source\n"))
> +		return;
> +
>  	/*
>  	 * active wakeup source should bring the system
>  	 * out of PM_SUSPEND_FREEZE state

Queued up for 4.2, thanks!


-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
--
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/