linux-kernel - Re: old buffer overflow in moxa driver

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Date:	Tue, 01 May 2007 00:05:59 -0400
From:	Andres Salomon <dilinger@...ian.org>
To:	dann frazier <dannf@...com>
CC:	linux-kernel@...r.kernel.org, Jiri Slaby <jirislaby@...il.com>,
	support@...a.com.tw
Subject: Re: old buffer overflow in moxa driver

Wow, I'd forgotten all about this one.

Signed-off-by: Andres Salomon <dilinger@...ian.org>

dann frazier wrote:
> hey,
>   I noticed that the moxa input checking security bug described by
> CVE-2005-0504 appears to remain unfixed upstream.
>  
> The issue is described here:
>   http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-0504
> 
> Debian has been shipping the following patch from Andres Salomon. I
> tried contacting the listed maintainer a few months ago but received
> no response.
> 
> I've tested that this still applies to and compiles against 2.6.21.
> 
> Signed-off-by: dann frazier <dannf@...com>
> 
> diff --git a/drivers/char/moxa.c b/drivers/char/moxa.c
> index 7dbaee8..e0d35c2 100644
> --- a/drivers/char/moxa.c
> +++ b/drivers/char/moxa.c
> @@ -1582,7 +1582,7 @@ copy:
>  
>  	if(copy_from_user(&dltmp, argp, sizeof(struct dl_str)))
>  		return -EFAULT;
> -	if(dltmp.cardno < 0 || dltmp.cardno >= MAX_BOARDS)
> +	if(dltmp.cardno < 0 || dltmp.cardno >= MAX_BOARDS || dltmp.len < 0)
>  		return -EINVAL;
>  
>  	switch(cmd)
> @@ -2529,6 +2529,8 @@ static int moxaloadbios(int cardno, unsigned char __user *tmp, int len)
>  	void __iomem *baseAddr;
>  	int i;
>  
> +	if(len < 0 || len > sizeof(moxaBuff))
> +		return -EINVAL;
>  	if(copy_from_user(moxaBuff, tmp, len))
>  		return -EFAULT;
>  	baseAddr = moxa_boards[cardno].basemem;
> @@ -2576,7 +2578,7 @@ static int moxaload320b(int cardno, unsigned char __user *tmp, int len)
>  	void __iomem *baseAddr;
>  	int i;
>  
> -	if(len > sizeof(moxaBuff))
> +	if(len < 0 || len > sizeof(moxaBuff))
>  		return -EINVAL;
>  	if(copy_from_user(moxaBuff, tmp, len))
>  		return -EFAULT;
> @@ -2596,6 +2598,8 @@ static int moxaloadcode(int cardno, unsigned char __user *tmp, int len)
>  	void __iomem *baseAddr, *ofsAddr;
>  	int retval, port, i;
>  
> +	if(len < 0 || len > sizeof(moxaBuff))
> +		return -EINVAL;
>  	if(copy_from_user(moxaBuff, tmp, len))
>  		return -EFAULT;
>  	baseAddr = moxa_boards[cardno].basemem;
> 

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