linux-kernel - RE: get rid of the address_space override in setsockopt

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Message-ID: <eafa16fad33a4255a97b55a56e58ae1a@AcuMS.aculab.com>
Date:   Wed, 22 Jul 2020 08:21:21 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Christoph Hellwig' <hch@....de>
CC:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        Eric Dumazet <edumazet@...gle.com>,
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Subject: RE: get rid of the address_space override in setsockopt

From: 'Christoph Hellwig'
> Sent: 22 July 2020 09:07
> On Tue, Jul 21, 2020 at 09:38:23AM +0000, David Laight wrote:
> > From: Christoph Hellwig
> > > Sent: 20 July 2020 13:47
> > >
> > > setsockopt is the last place in architecture-independ code that still
> > > uses set_fs to force the uaccess routines to operate on kernel pointers.
> > >
> > > This series adds a new sockptr_t type that can contained either a kernel
> > > or user pointer, and which has accessors that do the right thing, and
> > > then uses it for setsockopt, starting by refactoring some low-level
> > > helpers and moving them over to it before finally doing the main
> > > setsockopt method.
> >
> > Are you planning to make the equivalent change to getsockopt()?
> 
> No.  Only setsockopt can be fed kernel addresses from bpf-cgroup.
> There is no point in complicating the read side interface when it
> doesn't have that problem.

You realise that one of the SCTP getsockopt() is actually a command!
It is one of the requests that changes state and should probably
have been a separate system call.

	David

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