From: Jakub Kicinski <jakub.kicinski@netronome.com>
To: David Miller <davem@davemloft.net>
Cc: willemdebruijn.kernel@gmail.com, vvidic@valentin-vidic.from.hr,
borisp@mellanox.com, aviadye@mellanox.com,
john.fastabend@gmail.com, daniel@iogearbox.net,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] net/tls: Fix return values for setsockopt
Date: Wed, 4 Dec 2019 15:01:36 -0800 [thread overview]
Message-ID: <20191204150136.2f001242@cakuba.netronome.com> (raw)
In-Reply-To: <20191204.125135.750458923752225025.davem@davemloft.net>
On Wed, 04 Dec 2019 12:51:35 -0800 (PST), David Miller wrote:
> From: Willem de Bruijn <willemdebruijn.kernel@gmail.com>
> Date: Wed, 4 Dec 2019 15:43:00 -0500
> > On Wed, Dec 4, 2019 at 2:36 PM Jakub Kicinski wrote:
> >> On Wed, 4 Dec 2019 14:22:55 -0500, Willem de Bruijn wrote:
> >> > On Tue, Dec 3, 2019 at 6:08 PM Jakub Kicinski wrote:
> >> > > On Tue, 3 Dec 2019 23:44:58 +0100, Valentin Vidic wrote:
> >> > > > ENOTSUPP is not available in userspace:
> >> > > >
> >> > > > setsockopt failed, 524, Unknown error 524
> >> > > >
> >> > > > Signed-off-by: Valentin Vidic <vvidic@valentin-vidic.from.hr>
> >> > >
> >> > > I'm not 100% clear on whether we can change the return codes after they
> >> > > had been exposed to user space for numerous releases..
> >> >
> >> > This has also come up in the context of SO_ZEROCOPY in the past. In my
> >> > opinion the answer is no. A quick grep | wc -l in net/ shows 99
> >> > matches for this error code. Only a fraction of those probably make it
> >> > to userspace, but definitely more than this single case.
> >> >
> >> > If anything, it may be time to define it in uapi?
> >>
> >> No opinion but FWIW I'm toying with some CI for netdev, I've added a
> >> check for use of ENOTSUPP, apparently checkpatch already sniffs out
> >> uses of ENOSYS, so seems appropriate to add this one.
> >
> > Good idea if not exposing this in UAPI.
>
> I'm trying to understand this part of the discussion.
>
> If we have been returning a non-valid error code, this 524 internal
> kernel thing, it is _NOT_ an exposed UAPI.
>
> It is a kernel bug and we should fix it.
I agree. We should just fix this.
As Willem points out the use of this error code has spread, but in
theory I'm a co-maintainer of the TLS code now, and my maintainer
gut says "just fix it" :)
> If userspace anywhere is checking for 524, that is what needs to be fixed.
FWIW I did a quick grep through openssl and gnutls and fbthrift and I
see no references to ENOTSUPP or 524.
Valentin, what's the strategy you're using for this fix? There's a
bunch of ENOTSUPP in net/tls/tls_sw.c as well, could you convert those,
too?
next prev parent reply other threads:[~2019-12-04 23:02 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-03 22:44 [PATCH] net/tls: Fix return values for setsockopt Valentin Vidic
2019-12-03 22:55 ` Jakub Kicinski
2019-12-04 18:29 ` [PATCH v2] " Valentin Vidic
2019-12-04 19:22 ` [PATCH] " Willem de Bruijn
2019-12-04 19:35 ` Jakub Kicinski
2019-12-04 20:43 ` Willem de Bruijn
2019-12-04 20:51 ` David Miller
2019-12-04 23:01 ` Jakub Kicinski [this message]
2019-12-05 0:55 ` David Miller
2019-12-05 6:41 ` [PATCH v3] net/tls: Fix return values to avoid ENOTSUPP Valentin Vidic
2019-12-05 19:34 ` Jakub Kicinski
2019-12-05 20:06 ` Willem de Bruijn
2019-12-05 20:43 ` Valentin Vidić
2019-12-05 20:45 ` Jakub Kicinski
2019-12-05 21:26 ` Willem de Bruijn
2019-12-05 23:08 ` Valentin Vidić
2019-12-07 4:17 ` David Miller
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