linux-kernel - Re: [PATCH] arch/powerpc/kernel: using %12.12s instead of %12s for avoiding memory overflow.

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Date:	Wed, 24 Apr 2013 15:45:27 +0800
From:	Chen Gang <gang.chen@...anux.com>
To:	Vasant Hegde <hegdevasant@...ux.vnet.ibm.com>
CC:	benh@...nel.crashing.org, paulus@...ba.org,
	Michael Neuling <mikey@...ling.org>,
	"sfr@...b.auug.org.au" <sfr@...b.auug.org.au>,
	linuxppc-dev@...ts.ozlabs.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] arch/powerpc/kernel: using %12.12s instead of %12s for
 avoiding memory overflow.

Hello Vasant Hegde:

How about this patch, is it OK ?

Thanks.


On 2013年03月25日 12:30, Chen Gang wrote:
> Hello Maintainers:
> 
>   could you help check this patch whether is ok ?
> 
>   thanks.
> 
> 
> On 2013年02月17日 12:00, Chen Gang wrote:
>> Hello relative members:
>>
>>   please give a glance to this patch, when you have time.
>>
>>   thanks.
>>
>>   :-)
>>
>> gchen.
>>
>>
>> 于 2013年01月24日 12:14, Chen Gang 写道:
>>>
>>>   for tmp_part->header.name:
>>>     it is "Terminating null required only for names < 12 chars".
>>>     so need to limit the %.12s for it in printk
>>>
>>>   additional info:
>>>
>>>     %12s  limit the width, not for the original string output length
>>>           if name length is more than 12, it still can be fully displayed.
>>>           if name length is less than 12, the ' ' will be filled before name.
>>>
>>>     %.12s truly limit the original string output length (precision)
>>>
>>>
>>> Signed-off-by: Chen Gang <gang.chen@...anux.com>
>>> ---
>>>  arch/powerpc/kernel/nvram_64.c |    2 +-
>>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/arch/powerpc/kernel/nvram_64.c b/arch/powerpc/kernel/nvram_64.c
>>> index bec1e93..57bf6d2 100644
>>> --- a/arch/powerpc/kernel/nvram_64.c
>>> +++ b/arch/powerpc/kernel/nvram_64.c
>>> @@ -202,7 +202,7 @@ static void __init nvram_print_partitions(char * label)
>>>  	printk(KERN_WARNING "--------%s---------\n", label);
>>>  	printk(KERN_WARNING "indx\t\tsig\tchks\tlen\tname\n");
>>>  	list_for_each_entry(tmp_part, &nvram_partitions, partition) {
>>> -		printk(KERN_WARNING "%4d    \t%02x\t%02x\t%d\t%12s\n",
>>> +		printk(KERN_WARNING "%4d    \t%02x\t%02x\t%d\t%12.12s\n",
>>>  		       tmp_part->index, tmp_part->header.signature,
>>>  		       tmp_part->header.checksum, tmp_part->header.length,
>>>  		       tmp_part->header.name);
>>>
>>
>>
> 
> 


-- 
Chen Gang

Asianux Corporation
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