Subject: Re: [PATCH] sctp: add verification checks to SCTP_AUTH_KEY option

From: Eugene Teo <[email-masked]>
Date: Tue, 26 Aug 2008 11:01:05 +0800

Vlad Yasevich wrote:
> Eugene Teo wrote:
>> Vlad Yasevich wrote:
[...]
>>> +	if (authkey->sca_keylength > optlen) {
>>> +		ret = -EINVAL;
>>> +		goto out;
>> Is there a better upper bound check?
> 
> Hm...  optlen - sizeof(struct sctp_authkey)  is more accurate.
> 
> There is really no other bound.

Linus suggested that it is better to declare an upper bound for key_len.
I think it makes a lot of sense as a key shouldn't be as long as the
boundary limit of its declared data type.

Thanks,
Eugene