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

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Message-ID: <4BA36D49.7080703@bfs.de>
Date:	Fri, 19 Mar 2010 13:25:45 +0100
From:	walter harms <wharms@....de>
To:	Dan Carpenter <error27@...il.com>,
	Shaohua Li <shaohua.li@...el.com>, 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] acpi_pad: "processor_aggregator" name too long



Dan Carpenter schrieb:
> 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>
> ---
> Feel free to pick your own name if you don't like mine.  :)
> 
> 
> diff --git a/drivers/acpi/acpi_pad.c b/drivers/acpi/acpi_pad.c
> index 7e52295..2db89d9 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	"proc_aggregator"
>  #define ACPI_PROCESSOR_AGGREGATOR_DEVICE_NAME "Processor Aggregator"
>  #define ACPI_PROCESSOR_AGGREGATOR_NOTIFY 0x80
>  static DEFINE_MUTEX(isolated_cpus_lock);


Hi Dan,
IMHO this does not solve the core problem. acpi should use kstrncpy or better a pointer.
The next guy that use "my_great_indentifier_is_longer_than_yours" will cause the same
problem.
But this is something that the acpi group needs to answer (fast).

re,
 wh

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