linux-kernel - Re: [PATCH 3/4] Intel PTI implementaiton of MIPI 1149.7.

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Date:	Tue, 19 Apr 2011 18:25:27 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	james_p_freyensee@...ux.intel.com
cc:	Greg Kroah-Hartman <gregkh@...e.de>, linux-kernel@...r.kernel.org,
	suhail.ahmed@...el.com, christophe.guerard@...el.com
Subject: Re: [PATCH 3/4] Intel PTI implementaiton of MIPI 1149.7.

On Tue, 19 Apr 2011, james_p_freyensee@...ux.intel.com wrote:

> +static void pti_control_frame_built_and_sent(struct pti_masterchannel *mc)
> +{
> +	struct pti_masterchannel mccontrol = {.master = CONTROL_ID,
> +					      .channel = 0};
> +	const char *control_format = "%3d %3d %s";
> +
> +	char comm[sizeof(current->comm) + 1];
> +	u8 control_frame[CONTROL_FRAME_LEN];
> +
> +	if (!in_interrupt())
> +		get_task_comm(comm, current);
> +	else
> +		strcpy(comm, "Interrupt");
> +
> +	/* Ensure our buffer is zero terminated */
> +	comm[sizeof(current->comm)] = 0;
> +

You definitely need to use get_task_comm() here, but that means you can't 
allocate char comm[] on the stack with anything but TASK_COMM_LEN, which 
is small enough that it shouldn't be an issue.  Otherwise there's nothing 
protecting sizeof(current->comm) from changing without holding 
task_lock(current).
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