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

From: Arnd Bergmann
Date: Tue Nov 24 2020 - 10:19:05 EST


From: Arnd Bergmann <arnd@xxxxxxxx>

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@xxxxxxxxxxxxx>
Cc: Jakub Kicinski <kuba@xxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Cc: Jiri Pirko <jiri@xxxxxxxxxxxx>
Cc: Taehee Yoo <ap420073@xxxxxxxxx>
Cc: Eric Dumazet <edumazet@xxxxxxxxxx>
Cc: Alexei Starovoitov <ast@xxxxxxxxxx>
Cc: Andrew Lunn <andrew@xxxxxxx>
Cc: netdev@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx


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