netdev - Re: get rid of the address_space override in setsockopt v2

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Message-Id: <20200724.154342.1433271593505001306.davem@davemloft.net>
Date:   Fri, 24 Jul 2020 15:43:42 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     hch@....de
Cc:     kuba@...nel.org, ast@...nel.org, daniel@...earbox.net,
        kuznet@....inr.ac.ru, yoshfuji@...ux-ipv6.org, edumazet@...gle.com,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, bpf@...r.kernel.org,
        netfilter-devel@...r.kernel.org, coreteam@...filter.org,
        linux-sctp@...r.kernel.org, linux-hams@...r.kernel.org,
        linux-bluetooth@...r.kernel.org, bridge@...ts.linux-foundation.org,
        linux-can@...r.kernel.org, dccp@...r.kernel.org,
        linux-decnet-user@...ts.sourceforge.net,
        linux-wpan@...r.kernel.org, linux-s390@...r.kernel.org,
        mptcp@...ts.01.org, lvs-devel@...r.kernel.org,
        rds-devel@....oracle.com, linux-afs@...ts.infradead.org,
        tipc-discussion@...ts.sourceforge.net, linux-x25@...r.kernel.org
Subject: Re: get rid of the address_space override in setsockopt v2

From: Christoph Hellwig <hch@....de>
Date: Thu, 23 Jul 2020 08:08:42 +0200

> 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.
> 
> Note that apparently the eBPF selftests do not even cover this path, so
> the series has been tested with a testing patch that always copies the
> data first and passes a kernel pointer.  This is something that works for
> most common sockopts (and is something that the ePBF support relies on),
> but unfortunately in various corner cases we either don't use the passed
> in length, or in one case actually copy data back from setsockopt, or in
> case of bpfilter straight out do not work with kernel pointers at all.
> 
> Against net-next/master.
> 
> Changes since v1:
>  - check that users don't pass in kernel addresses
>  - more bpfilter cleanups
>  - cosmetic mptcp tweak

Series applied to net-next, I'm build testing and will push this out when
that is done.

Thanks.