linux-kernel - Re: [PATCH] param_sysfs_builtin memchr argument fix

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Message-Id: <20071008091354.30598ee4.randy.dunlap@oracle.com>
Date:	Mon, 8 Oct 2007 09:13:54 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Dave Young <hidave.darkstar@...il.com>
Cc:	xiyou.wangcong@...il.com, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, gregkh@...e.de
Subject: Re: [PATCH] param_sysfs_builtin memchr argument fix

On Mon, 8 Oct 2007 15:17:30 +0800 Dave Young wrote:

> Hi,
> Thanks for comment.
> fixed.
> 
> Regards
> dave
> -----
> 
> If memchr argument is longer than strlen(kp->name), there will be some
> weird result.

Just to clarify:  this was causing duplicate filenames in sysfs ?


> Signed-off-by: Dave Young <hidave.darkstar@...il.com> 
> 
> ---
> kernel/params.c |    8 +++++++-
> 1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff -upr linux/kernel/params.c linux.new/kernel/params.c
> --- linux/kernel/params.c	2007-10-08 14:30:06.000000000 +0800
> +++ linux.new/kernel/params.c	2007-10-08 15:13:04.000000000 +0800
> @@ -592,11 +592,17 @@ static void __init param_sysfs_builtin(v
>  
>  	for (i=0; i < __stop___param - __start___param; i++) {
>  		char *dot;
> +		size_t kplen;
>  
>  		kp = &__start___param[i];
> +		kplen = strlen(kp->name);
>  
>  		/* We do not handle args without periods. */
> -		dot = memchr(kp->name, '.', MAX_KBUILD_MODNAME);
> +		if (kplen > MAX_KBUILD_MODNAME) {
> +			DEBUGP("kernel parameter %s is too long\n", kp->name);

how about
	kernel parameter name %s is too long
or
	kernel parameter name is too long: %s

(primary is addition of "name")

> +			continue;
> +		}
> +		dot = memchr(kp->name, '.', kplen);
>  		if (!dot) {
>  			DEBUGP("couldn't find period in %s\n", kp->name);
>  			continue;
> -


---
~Randy
-
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