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

From: Chen Gang <[email-masked]>
Date: Tue, 12 Mar 2013 08:39:07 +0800

Hello Benjamin Herrenschmidt:

  how about this patch ?   is it correct ?

  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 <[email-masked]>
> ---
>  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