linux-kernel - Re: [patch v2] acpi_pad: "processor

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Date:	Tue, 6 Apr 2010 09:21:13 +0800
From:	Shaohua Li <shaohua.li@...el.com>
To:	Dan Carpenter <error27@...il.com>, Pavel Machek <pavel@....cz>,
	Len Brown <lenb@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Chen Gong <gong.chen@...ux.intel.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: Re: [patch v2] acpi_pad: "processor_aggregator" name too long

On Thu, Mar 25, 2010 at 10:41:22PM +0800, Dan Carpenter wrote:
> cpi_device_class can only be 19 characters and a NULL terminator.
> 
> With the current name we get a buffer overflow in acpi_pad_add()
> 	strcpy(acpi_device_class(device), ACPI_PROCESSOR_AGGREGATOR_CLASS);
> 
> Signed-off-by: Dan Carpenter <error27@...il.com>
> ---
> V2: Thanks to Pavel Machek for coming up with the right name for this.
> 
> diff --git a/drivers/acpi/acpi_pad.c b/drivers/acpi/acpi_pad.c
> index 7e52295..790aaa1 100644
> --- a/drivers/acpi/acpi_pad.c
> +++ b/drivers/acpi/acpi_pad.c
> @@ -30,7 +30,7 @@
>  #include <acpi/acpi_bus.h>
>  #include <acpi/acpi_drivers.h>
>  
> -#define ACPI_PROCESSOR_AGGREGATOR_CLASS	"processor_aggregator"
> +#define ACPI_PROCESSOR_AGGREGATOR_CLASS	"cpu_aggregator"
>  #define ACPI_PROCESSOR_AGGREGATOR_DEVICE_NAME "Processor Aggregator"
>  #define ACPI_PROCESSOR_AGGREGATOR_NOTIFY 0x80
>  static DEFINE_MUTEX(isolated_cpus_lock);
sorry for being later to reply. Better the name could be 'acpi_pad', which
is what the spec called. cpu_aggregator looks like a invented name.

Thanks,
Shaohua
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