linux-kernel - Re: [PATCH] kernel/params.c: use scnprintf() instead of sprintf()

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Date:	Wed, 21 Aug 2013 10:04:12 +0800
From:	Chen Gang <gang.chen@...anux.com>
To:	Rusty Russell <rusty@...tcorp.com.au>
CC:	jg1.han@...sung.com, khali@...ux-fr.org, David.Woodhouse@...el.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] kernel/params.c: use scnprintf() instead of sprintf()

On 08/20/2013 02:05 PM, Rusty Russell wrote:
> Chen Gang <gang.chen@...anux.com> writes:
> 
>> For some strings (e.g. version string), they are permitted to be larger
>> than PAGE_SIZE (although meaningless), so recommend to use scnprintf()
>> instead of sprintf().
> 
> Applied.
> 

Thanks.

> Thanks,
> Rusty.
> 
>>
>> Signed-off-by: Chen Gang <gang.chen@...anux.com>
>> ---
>>  kernel/params.c |    7 ++++---
>>  1 files changed, 4 insertions(+), 3 deletions(-)
>>
>> diff --git a/kernel/params.c b/kernel/params.c
>> index 1f228a3..4da300f 100644
>> --- a/kernel/params.c
>> +++ b/kernel/params.c
>> @@ -241,7 +241,8 @@ int parse_args(const char *doing,
>>  	}								\
>>  	int param_get_##name(char *buffer, const struct kernel_param *kp) \
>>  	{								\
>> -		return sprintf(buffer, format, *((type *)kp->arg));	\
>> +		return scnprintf(buffer, PAGE_SIZE, format,		\
>> +				*((type *)kp->arg));			\
>>  	}								\
>>  	struct kernel_param_ops param_ops_##name = {			\
>>  		.set = param_set_##name,				\
>> @@ -285,7 +286,7 @@ EXPORT_SYMBOL(param_set_charp);
>>  
>>  int param_get_charp(char *buffer, const struct kernel_param *kp)
>>  {
>> -	return sprintf(buffer, "%s", *((char **)kp->arg));
>> +	return scnprintf(buffer, PAGE_SIZE, "%s", *((char **)kp->arg));
>>  }
>>  EXPORT_SYMBOL(param_get_charp);
>>  
>> @@ -827,7 +828,7 @@ ssize_t __modver_version_show(struct module_attribute *mattr,
>>  	struct module_version_attribute *vattr =
>>  		container_of(mattr, struct module_version_attribute, mattr);
>>  
>> -	return sprintf(buf, "%s\n", vattr->version);
>> +	return scnprintf(buf, PAGE_SIZE, "%s\n", vattr->version);
>>  }
>>  
>>  extern const struct module_version_attribute *__start___modver[];
>> -- 
>> 1.7.7.6
> 
> 


-- 
Chen Gang
--
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