linux-kernel - Re: CVE-2009-2584

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Date:	Thu, 5 Nov 2009 18:47:33 +0100
From:	Michael Buesch <mb@...sch.de>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Jiri Kosina <jkosina@...e.cz>,
	Michael Gilbert <michael.s.gilbert@...il.com>,
	Jack Steiner <steiner@....com>, linux-kernel@...r.kernel.org,
	stable@...nel.org
Subject: Re: CVE-2009-2584

On Thursday 05 November 2009 18:38:21 Linus Torvalds wrote:
> @@ -161,14 +161,15 @@ static int options_show(struct seq_file *s, void *p)
>  static ssize_t options_write(struct file *file, const char __user *userbuf,
>  			     size_t count, loff_t *data)
>  {
> -	unsigned long val;
> -	char buf[80];
> +	char buf[16];
>  
> -	if (strncpy_from_user(buf, userbuf, sizeof(buf) - 1) < 0)
> +	if (count >= sizeof(buf))
> +		return -EINVAL;
> +	if (copy_from_user(buf, userbuf, count))
>  		return -EFAULT;
> -	buf[count - 1] = '\0';
> -	if (!strict_strtoul(buf, 10, &val))
> -		gru_options = val;
> +	buf[count] = '\0';
> +	if (strict_strtoul(buf, 0, &gru_options))
> +		return -EINVAL;
>  
>  	return count;
>  }
> 
> 

Looks OK to me. I can't test it however, as I don't own the hardware.

-- 
Greetings, Michael.
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