netdev - Re: [PATCH net] KEYS: DNS: fix parsing multiple options

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Date:   Mon, 25 Jun 2018 10:37:24 -0700
From:   Eric Biggers <ebiggers3@...il.com>
To:     "David S . Miller" <davem@...emloft.net>
Cc:     netdev@...r.kernel.org, David Howells <dhowells@...hat.com>,
        keyrings@...r.kernel.org, Wang Lei <wang840925@...il.com>,
        Eric Biggers <ebiggers@...gle.com>
Subject: Re: [PATCH net] KEYS: DNS: fix parsing multiple options

On Thu, Jun 14, 2018 at 05:14:30PM +0100, David Howells wrote:
> The fix seems to work, but the use of kstrtoul():
> 
> 	ret = kstrtoul(eq, 10, &derrno);
> 
> is incorrect since the buffer can't been modified to block out the next
> argument if there is one, so the following fails:
> 
> 	perl -e 'print "#dnserror=1#", "\x00" x 1' |
> 	keyctl padd dns_resolver desc @s
> 
> (Note this is preexisting and nothing to do with your patch).
> 
> I'm not sure how best to handle this.
> 
> Anyway, Dave, can you take Eric's patch into the net tree with:
> 
> 	Acked-by: David Howells <dhowells@...hat.com>
> 
> David

It could be handled by copying the option value to a temporary buffer.
Anyway, that can be a separate fix...

David (Miller), are you planning to take this through -net?

Thanks!

- Eric