linux-kernel - Re: [PATCH] getsockopt() early argument sanity checking

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Message-ID: <44E9A272.3020202@redhat.com>
Date:	Mon, 21 Aug 2006 22:09:22 +1000
From:	Eugene Teo <eteo@...hat.com>
To:	Willy Tarreau <w@....eu>
CC:	Michael Buesch <mb@...sch.de>, Solar Designer <solar@...nwall.com>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH] getsockopt() early argument sanity checking

Willy Tarreau wrote:
> On Sun, Aug 20, 2006 at 02:05:20AM +0200, Michael Buesch wrote:
>> On Sunday 20 August 2006 01:48, Willy Tarreau wrote:
>>> On Sun, Aug 20, 2006 at 03:05:32AM +0400, Solar Designer wrote:
[snipped]
> diff --git a/net/socket.c b/net/socket.c
> index ac45b13..910ef88 100644
> --- a/net/socket.c
> +++ b/net/socket.c
> @@ -1307,11 +1307,17 @@ asmlinkage long sys_setsockopt(int fd, i
>  asmlinkage long sys_getsockopt(int fd, int level, int optname, char *optval, int *optlen)
>  {
>  	int err;
> +	int len;
        ^^^^^^^^

>  	struct socket *sock;
>  
>  	if ((sock = sockfd_lookup(fd, &err))!=NULL)
>  	{
> -		if (level == SOL_SOCKET)
> +		/* XXX: insufficient for SMP, but should be redundant anyway */
> +		if (get_user(len, optlen))
> +			err = -EFAULT;
> +		else if (len < 0)
                ^^^^^^^^^^^^^^^^^

s/else//

> +			err = -EINVAL;
> +		else if (level == SOL_SOCKET)

s/else//

>  			err=sock_getsockopt(sock,level,optname,optval,optlen);
>  		else
>  			err=sock->ops->getsockopt(sock, level, optname, optval, optlen);

These checks are already in getsockopt(). Duplicated code?

Eugene
-- 
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