linux-kernel - Re: [PATCH] ASoC: Intel: avoid format string leak to thread name

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Message-ID: <537EF534.5060908@linux.intel.com>
Date:	Fri, 23 May 2014 10:13:56 +0300
From:	Jarkko Nikula <jarkko.nikula@...ux.intel.com>
To:	Kees Cook <keescook@...omium.org>, linux-kernel@...r.kernel.org
CC:	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.de>,
	Wenkai Du <wenkai.du@...el.com>,
	Dan Carpenter <dan.carpenter@...cle.com>,
	Christian Engelmayer <cengelma@....at>,
	alsa-devel@...a-project.org
Subject: Re: [PATCH] ASoC: Intel: avoid format string leak to thread name

On 05/22/2014 09:43 PM, Kees Cook wrote:
> This makes sure a format string can never get processed into the worker
> thread name from the device name.
>
> Signed-off-by: Kees Cook <keescook@...omium.org>
> ---
>   sound/soc/intel/sst-baytrail-ipc.c |    2 +-
>   sound/soc/intel/sst-haswell-ipc.c  |    2 +-
>   2 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/sound/soc/intel/sst-baytrail-ipc.c b/sound/soc/intel/sst-baytrail-ipc.c
> index 0d31dbbf4806..1b25bf168beb 100644
> --- a/sound/soc/intel/sst-baytrail-ipc.c
> +++ b/sound/soc/intel/sst-baytrail-ipc.c
> @@ -809,7 +809,7 @@ int sst_byt_dsp_init(struct device *dev, struct sst_pdata *pdata)
>   	/* start the IPC message thread */
>   	init_kthread_worker(&byt->kworker);
>   	byt->tx_thread = kthread_run(kthread_worker_fn,
> -				     &byt->kworker,
> +				     &byt->kworker, "%s",
>   				     dev_name(byt->dev));
>   	if (IS_ERR(byt->tx_thread)) {
>   		err = PTR_ERR(byt->tx_thread);
> diff --git a/sound/soc/intel/sst-haswell-ipc.c b/sound/soc/intel/sst-haswell-ipc.c
> index e7996b39a484..a8fd60c67341 100644
> --- a/sound/soc/intel/sst-haswell-ipc.c
> +++ b/sound/soc/intel/sst-haswell-ipc.c
> @@ -1735,7 +1735,7 @@ int sst_hsw_dsp_init(struct device *dev, struct sst_pdata *pdata)
>   	/* start the IPC message thread */
>   	init_kthread_worker(&hsw->kworker);
>   	hsw->tx_thread = kthread_run(kthread_worker_fn,
> -					   &hsw->kworker,
> +					   &hsw->kworker, "%s",
>   					   dev_name(hsw->dev));
>   	if (IS_ERR(hsw->tx_thread)) {
>   		ret = PTR_ERR(hsw->tx_thread);
This is not very fatal as name comes from sound/soc/intel/sst-acpi.c so 
only developer can hit this but to be on safe side:

Acked-by: Jarkko Nikula <jarkko.nikula@...ux.intel.com>
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