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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

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
-- 
eteo redhat.com  ph: +65 6490 4142  http://www.kernel.org/~eugeneteo
gpg fingerprint:  47B9 90F6 AE4A 9C51 37E0  D6E1 EA84 C6A2 58DF 8823
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/