linux-kernel - Re: [PATCH] Fix VIDIOCGAP corruption in ivtv

Open Source and information security mailing list archives

Date:	Sun, 20 Apr 2008 18:06:33 +0200
From:	Hans Verkuil <hverkuil@...all.nl>
To:	video4linux-list@...hat.com
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>, linux-kernel@...r.kernel.org,
	Mauro Carvalho Chehab <mchehab@...radead.org>,
	Mike Krufky <mkrufky@...uxtv.org>, ivtv-devel@...vdriver.org,
	"Frank Bennett" <biercenator@...il.com>
Subject: Re: [PATCH] Fix VIDIOCGAP corruption in ivtv

On Sunday 20 April 2008 13:27:36 Alan Cox wrote:
> Frank Bennett reported that ivtv was causing skype to crash. With
> help from one of their developers he showed it was a kernel problem.
> VIDIOCGCAP copies a name into a fixed length buffer - ivtv uses names
> that are too long and does not truncate them so corrupts a few bytes
> of the app data area.
>
> Possibly the names also want trimming but for now this should fix the
> corruption case.

Ouch, nasty one.

Mauro, can you apply this patch to the v4l-dvb master?

Mike, this one should obviously go into a 2.6.25 dot-release, and I 
think also to a 2.6.24 dot-release.

Frank, thank you for reporting this!

	Hans

Signed-off-by: Hans Verkuil <hverkuil@...all.nl>

>
> Signed-off-by: Alan Cox <alan@...hat.com>
>
> ---
> linux.vanilla-2.6.25-rc8-mm2/drivers/media/video/ivtv/ivtv-ioctl.c	20
>08-04-13 15:36:53.000000000 +0100 +++
> linux-2.6.25-rc8-mm2/drivers/media/video/ivtv/ivtv-ioctl.c	2008-04-20
> 12:15:33.000000000 +0100 @@ -742,7 +742,8 @@
>
>  		memset(vcap, 0, sizeof(*vcap));
>  		strcpy(vcap->driver, IVTV_DRIVER_NAME);     /* driver name */
> -		strcpy(vcap->card, itv->card_name); 	    /* card type */
> +		strncpy(vcap->card, itv->card_name,
> +				sizeof(vcap->card)-1); 	    /* card type */
>  		strcpy(vcap->bus_info, pci_name(itv->dev)); /* bus info... */
>  		vcap->version = IVTV_DRIVER_VERSION; 	    /* version */
>  		vcap->capabilities = itv->v4l2_cap; 	    /* capabilities */
>
> --
> 		"Hello, welcome to Jon Masters' house of pain"
> 				- Jon after a particularly good night
>
> --
> video4linux-list mailing list
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