netdev - Re: [PATCH 2/4] sctp: Add ip option support

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Message-ID: <CAHC9VhQ5iQsXum6NVkL-qdzu=bxVcaOscPjTSVufLzRbW_1_Pw@mail.gmail.com>
Date:   Tue, 12 Dec 2017 17:24:46 -0500
From:   Paul Moore <paul@...l-moore.com>
To:     Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
Cc:     Richard Haines <richard_c_haines@...nternet.com>,
        selinux@...ho.nsa.gov, netdev@...r.kernel.org,
        linux-sctp@...r.kernel.org, linux-security-module@...r.kernel.org,
        Vlad Yasevich <vyasevich@...il.com>, nhorman@...driver.com,
        Stephen Smalley <sds@...ho.nsa.gov>,
        Eric Paris <eparis@...isplace.org>
Subject: Re: [PATCH 2/4] sctp: Add ip option support

On Tue, Dec 12, 2017 at 4:56 PM, Marcelo Ricardo Leitner
<marcelo.leitner@...il.com> wrote:
> On Tue, Dec 12, 2017 at 04:33:03PM -0500, Paul Moore wrote:
>> On Tue, Dec 12, 2017 at 11:08 AM, Marcelo Ricardo Leitner
>> <marcelo.leitner@...il.com> wrote:
>> > Hi Richard,
>> >
>> > On Mon, Nov 27, 2017 at 07:31:21PM +0000, Richard Haines wrote:
>> > ...
>> >> --- a/net/sctp/socket.c
>> >> +++ b/net/sctp/socket.c
>> >> @@ -3123,8 +3123,10 @@ static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, unsigned
>> >>
>> >>       if (asoc) {
>> >>               if (val == 0) {
>> >> +                     struct sctp_af *af = sp->pf->af;
>> >>                       val = asoc->pathmtu;
>> >> -                     val -= sp->pf->af->net_header_len;
>> >> +                     val -= af->ip_options_len(asoc->base.sk);
>> >> +                     val -= af->net_header_len;
>> >>                       val -= sizeof(struct sctphdr) +
>> >>                                       sizeof(struct sctp_data_chunk);
>> >>               }
>> >
>> > Right below here there is a call to sctp_frag_point(). That function
>> > also needs this tweak.
>> >
>> > Yes, we should simplify all these calculations. I have a patch to use
>> > sctp_frag_point on where it is currently recalculating it on
>> > sctp_datamsg_from_user(), but probably should include other places as
>> > well.
>>
>> FYI: Richard let me know he is occupied with another project at the
>> moment and likely won't be able to do another respin until next week
>> at the earliest.
>
> Okay, thanks. I can do a follow-up patch if it helps.

I'll leave that up to you, I think your comments are pretty
straightforward and should be easy for Richard to incorporate, and
there is a lot to be said for including the fix in the original patch,
but if you would prefer to send a separate patch I think that's fine
too.

-- 
paul moore
www.paul-moore.com