Re: [PATCH 0/3] PROTO_CMSG_DATA_ONLY for Datagram (UDP)

[Jens Axboe <axboe@kernel.dk>]

On 12/12/20 10:25 AM, Victor Stewart wrote:
> On Sat, Dec 12, 2020 at 5:07 PM Jens Axboe <axboe@kernel.dk> wrote:
>>
>> On 12/12/20 8:31 AM, Victor Stewart wrote:
>>> RE our conversation on the "[RFC 0/1] whitelisting UDP GSO and GRO
>>> cmsgs" thread...
>>>
>>> https://lore.kernel.org/io-uring/CAM1kxwi5m6i8hrtkw7nZYoziPTD-Wp03+fcsUwh3CuSc=81kUQ@mail.gmail.com/
>>>
>>> here are the patches we discussed.
>>>
>>> Victor Stewart (3):
>>>    net/socket.c: add PROTO_CMSG_DATA_ONLY to __sys_sendmsg_sock
>>>    net/ipv4/af_inet.c: add PROTO_CMSG_DATA_ONLY to inet_dgram_ops
>>>    net/ipv6/af_inet6.c: add PROTO_CMSG_DATA_ONLY to inet6_dgram_ops
>>>
>>>    net/ipv4/af_inet.c
>>>      |   1 +
>>>    net/ipv6/af_inet6.c
>>>     |   1 +
>>>    net/socket.c
>>>        |   8 +-
>>>    3 files changed, 7 insertions(+), 3 deletions(-)
>>
>> Changes look fine to me, but a few comments:
>>
>> - I'd order 1/3 as 3/3, that ordering makes more sense as at that point it
>>   could actually be used.
> 
> right that makes sense.
> 
>>
>> - For adding it to af_inet/af_inet6, you should write a better commit message
>>   on the reasoning for the change. Right now it just describes what the
>>   patch does (which is obvious from the change), not WHY it's done. Really
>>   goes for current 1/3 as well, commit messages need to be better in
>>   general.
>>
> 
> okay thanks Jens. i would have reiterated the intention but assumed it
> were implicit given I linked the initial conversation about enabling
> UDP_SEGMENT (GSO) and UDP_GRO through io_uring.
> 
>> I'd also CC Jann Horn on the series, he's the one that found an issue there
>> in the past and also acked the previous change on doing PROTO_CMSG_DATA_ONLY.
> 
> I CCed him on this reply. Soheil at the end of the first exchange
> thread said he audited the UDP paths and believed this to be safe.
> 
> how/should I resubmit the patch with a proper intention explanation in
> the meta and reorder the patches? my first patch and all lol.

Just post is as a v2 with the change noted in the cover letter. I'd also
ensure that it threads properly, right now it's just coming through as 4
separate emails at my end. If you're using git send-email, make sure you
add --thread to the arguments.

-- 
Jens Axboe