[PATCH net-next v4 0/4] remove compat_alloc_user_space()

[Arnd Bergmann <arnd@kernel.org>]

From: Arnd Bergmann <arnd@arndb.de>

This is the fourth version of my series, now spanning four patches
instead of two, with a new approach for handling struct ifreq
compatibility after I realized that my earlier approach introduces
additional problems.

The idea here is to always push down the compat conversion
deeper into the call stack: rather than pretending to be
native mode with a modified copy of the original data on
the user space stack, have the code that actually works on
the data understand the difference between native and compat
versions.

I have spent a long time looking at all drivers that implement
an ndo_do_ioctl callback to verify that my assumptions are
correct. This has led to a series of 29 additional patches
that I am not including here but will post separately, fixing
a number of bugs in SIOCDEVPRIVATE ioctls, removing dead
code, and splitting ndo_do_ioctl into two new ndo callbacks
for private and ethernet specific commands.

The patches are identical to v3 that I sent a few weeks ago,
except this avoids the build failure when CONFIG_COMPAT is
disabled.

      Arnd

Changes in v4:
 - build fix without CONFIG_INET
 - build fix without CONFIG_COMPAT
 - style fixes pointed out by hch

Changes in v3:
 - complete rewrite of the series


Arnd Bergmann (4):
  ethtool: improve compat ioctl handling
  net: socket: rework SIOC?IFMAP ioctls
  net: socket: simplify dev_ifconf handling
  net: socket: rework compat_ifreq_ioctl()

 include/linux/compat.h     |  82 +++++------
 include/linux/ethtool.h    |   4 -
 include/linux/inetdevice.h |   9 ++
 include/linux/netdevice.h  |  12 +-
 net/appletalk/ddp.c        |   4 +-
 net/core/dev_ioctl.c       | 152 ++++++++++---------
 net/ethtool/ioctl.c        | 143 ++++++++++++++++--
 net/ieee802154/socket.c    |   4 +-
 net/ipv4/af_inet.c         |   6 +-
 net/ipv4/devinet.c         |   4 +-
 net/qrtr/qrtr.c            |   4 +-
 net/socket.c               | 289 ++++++++-----------------------------
 12 files changed, 338 insertions(+), 375 deletions(-)

Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Jiri Pirko <jiri@mellanox.com>
Cc: Taehee Yoo <ap420073@gmail.com>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Andrew Lunn <andrew@lunn.ch>
Cc: netdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org


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2.27.0