linux-kernel - Re: [PATCH v2 4/6] device_cgroup: stop using simple

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Date:	Wed, 5 Sep 2012 03:22:10 +0000
From:	"Serge E. Hallyn" <serge@...lyn.com>
To:	Aristeu Rozanski <aris@...hat.com>
Cc:	linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
	Tejun Heo <tj@...nel.org>, Li Zefan <lizefan@...wei.com>,
	James Morris <jmorris@...ei.org>,
	Pavel Emelyanov <xemul@...nvz.org>,
	Serge Hallyn <serge.hallyn@...onical.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v2 4/6] device_cgroup: stop using simple_strtoul()

Quoting Aristeu Rozanski (aris@...hat.com):
> This patch converts the code to use kstrtou32() instead of simple_strtoul()
> which is deprecated. The real size of the variables are u32, so use kstrtou32
> instead of kstrtoul
> 
> Signed-off-by: Aristeu Rozanski <aris@...hat.com>

phew, i'm afraid i'm not up on the latest 'best parsing techniques' 
but the end result looks correct (just not sure it's optimal).

Acked-by: Serge Hallyn <serge.hallyn@...onical.com>

> 
> ---
>  security/device_cgroup.c |   28 ++++++++++++++++++++++------
>  1 file changed, 22 insertions(+), 6 deletions(-)
> 
> Index: github/security/device_cgroup.c
> ===================================================================
> --- github.orig/security/device_cgroup.c	2012-08-21 10:51:05.751689805 -0400
> +++ github/security/device_cgroup.c	2012-08-21 10:51:15.015951623 -0400
> @@ -361,8 +361,8 @@
>  				   int filetype, const char *buffer)
>  {
>  	const char *b;
> -	char *endp;
> -	int count;
> +	char temp[12];		/* 11 + 1 characters needed for a u32 */
> +	int count, rc;
>  	struct dev_whitelist_item wh;
>  
>  	if (!capable(CAP_SYS_ADMIN))
> @@ -405,8 +405,16 @@
>  		wh.major = ~0;
>  		b++;
>  	} else if (isdigit(*b)) {
> -		wh.major = simple_strtoul(b, &endp, 10);
> -		b = endp;
> +		memset(temp, 0, sizeof(temp));
> +		for (count = 0; count < sizeof(temp) - 1; count++) {
> +			temp[count] = *b;
> +			b++;
> +			if (!isdigit(*b))
> +				break;
> +		}
> +		rc = kstrtou32(temp, 10, &wh.major);
> +		if (rc)
> +			return -EINVAL;
>  	} else {
>  		return -EINVAL;
>  	}
> @@ -419,8 +427,16 @@
>  		wh.minor = ~0;
>  		b++;
>  	} else if (isdigit(*b)) {
> -		wh.minor = simple_strtoul(b, &endp, 10);
> -		b = endp;
> +		memset(temp, 0, sizeof(temp));
> +		for (count = 0; count < sizeof(temp) - 1; count++) {
> +			temp[count] = *b;
> +			b++;
> +			if (!isdigit(*b))
> +				break;
> +		}
> +		rc = kstrtou32(temp, 10, &wh.minor);
> +		if (rc)
> +			return -EINVAL;
>  	} else {
>  		return -EINVAL;
>  	}
> 
> --
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