linux-kernel - Re: [PATCH V2]irq/core: Add a length limitation

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Date:	Wed, 25 Nov 2009 22:16:55 +0800
From:	Yong Zhang <yong.zhang0@...il.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Liuweni <qingshenlwy@...il.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>, xgr178 <xgr178@....com>,
	strongzgy <strongzgy@...il.com>,
	qingshenlwy <qingshenlwy@....com>, rusty <rusty@...tcorp.com.au>,
	travis <travis@....com>, adobriyan <adobriyan@...il.com>
Subject: Re: [PATCH V2]irq/core: Add a length limitation

On Wed, Nov 25, 2009 at 10:08 PM, Thomas Gleixner <tglx@...utronix.de> wrote:
> On Wed, 25 Nov 2009, Liuweni wrote:
>
>>  ---
>> In this version, I modify the code by Ingo's suggestion,
>> and less code add.
>> The code will check the irqaction->name's length
>> and avoid Using too long name without any notice.
>>
>> --- a/kernel/irq/proc.c
>> +++ b/kernel/irq/proc.c
>> @@ -196,6 +196,8 @@ void register_handler_proc(unsigned int irq, struct irqaction *action)
>>       char name [MAX_NAMELEN];
>>       struct irq_desc *desc = irq_to_desc(irq);
>>
>> +     WARN_ON(strlen(action->name) < MAX_NAMELEN);
>> +
>
> This is going to warn on every action->name which is actually used in
> the kernel except for the ones which are too long.
>

Even we add WARN_ON(strlen(action->name) > MAX_NAMELEN), I think it doesn't
affect the runtime things, what it could tell is that there maybe two
different irqs
with the same name showed under /proc

Thanks,
Yong

> Thanks,
>
>        tglx
>
>
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