[PATCH 00/17] v3 net generic subsystem refcount conversions

From: Elena Reshetova
Date: Fri Jun 30 2017 - 06:13:26 EST

Changes in v3:
Rebased on top of the net-next tree.

Changes in v2:
No changes in patches apart from rebases, but now by
default refcount_t = atomic_t (*) and uses all atomic standard operations
unless CONFIG_REFCOUNT_FULL is enabled. This is a compromise for the
systems that are critical on performance (such as net) and cannot accept even
slight delay on the refcounter operations.

This series, for core network subsystem components, replaces atomic_t reference
counters with the new refcount_t type and API (see include/linux/refcount.h).
By doing this we prevent intentional or accidental
underflows or overflows that can led to use-after-free vulnerabilities.
These patches contain only generic net pieces. Other changes will be sent separately.

The patches are fully independent and can be cherry-picked separately.
The big patches, such as conversions for sock structure, need a very detailed
look from maintainers: refcount managing is quite complex in them and while
it seems that they would benefit from the change, extra checking is needed.
The biggest corner issue is the fact that refcount_inc() does not increment
from zero.

If there are no objections to the patches, please merge them via respective trees.

* The respective change is currently merged into -next as
"locking/refcount: Create unchecked atomic_t implementation".

Elena Reshetova (17):
net: convert inet_peer.refcnt from atomic_t to refcount_t
net: convert neighbour.refcnt from atomic_t to refcount_t
net: convert neigh_params.refcnt from atomic_t to refcount_t
net: convert nf_bridge_info.use from atomic_t to refcount_t
net: convert sk_buff.users from atomic_t to refcount_t
net: convert sk_buff_fclones.fclone_ref from atomic_t to refcount_t
net: convert sock.sk_wmem_alloc from atomic_t to refcount_t
net: convert sock.sk_refcnt from atomic_t to refcount_t
net: convert ip_mc_list.refcnt from atomic_t to refcount_t
net: convert in_device.refcnt from atomic_t to refcount_t
net: convert netpoll_info.refcnt from atomic_t to refcount_t
net: convert unix_address.refcnt from atomic_t to refcount_t
net: convert fib_rule.refcnt from atomic_t to refcount_t
net: convert inet_frag_queue.refcnt from atomic_t to refcount_t
net: convert net.passive from atomic_t to refcount_t
net: convert netlbl_lsm_cache.refcount from atomic_t to refcount_t
net: convert packet_fanout.sk_ref from atomic_t to refcount_t

crypto/algif_aead.c | 2 +-
drivers/atm/fore200e.c | 12 +-----------
drivers/atm/he.c | 2 +-
drivers/atm/idt77252.c | 4 ++--
drivers/infiniband/hw/nes/nes_cm.c | 4 ++--
drivers/isdn/mISDN/socket.c | 2 +-
drivers/net/rionet.c | 2 +-
drivers/s390/net/ctcm_main.c | 26 +++++++++++++-------------
drivers/s390/net/netiucv.c | 10 +++++-----
drivers/s390/net/qeth_core_main.c | 4 ++--
include/linux/atmdev.h | 2 +-
include/linux/igmp.h | 3 ++-
include/linux/inetdevice.h | 11 ++++++-----
include/linux/netpoll.h | 3 ++-
include/linux/skbuff.h | 20 ++++++++++----------
include/net/af_unix.h | 3 ++-
include/net/arp.h | 2 +-
include/net/fib_rules.h | 7 ++++---
include/net/inet_frag.h | 4 ++--
include/net/inet_hashtables.h | 4 ++--
include/net/inetpeer.h | 4 ++--
include/net/ndisc.h | 2 +-
include/net/neighbour.h | 15 ++++++++-------
include/net/net_namespace.h | 3 ++-
include/net/netfilter/br_netfilter.h | 2 +-
include/net/netlabel.h | 8 ++++----
include/net/request_sock.h | 9 +++++----
include/net/sock.h | 25 +++++++++++++------------
net/atm/br2684.c | 2 +-
net/atm/clip.c | 8 ++++----
net/atm/common.c | 10 +++++-----
net/atm/lec.c | 4 ++--
net/atm/mpc.c | 4 ++--
net/atm/pppoatm.c | 2 +-
net/atm/proc.c | 2 +-
net/atm/raw.c | 2 +-
net/atm/signaling.c | 2 +-
net/bluetooth/af_bluetooth.c | 2 +-
net/bluetooth/rfcomm/sock.c | 2 +-
net/bridge/br_netfilter_hooks.c | 4 ++--
net/caif/caif_socket.c | 2 +-
net/core/datagram.c | 6 +++---
net/core/dev.c | 10 +++++-----
net/core/fib_rules.c | 4 ++--
net/core/neighbour.c | 22 +++++++++++-----------
net/core/net-sysfs.c | 2 +-
net/core/net_namespace.c | 4 ++--
net/core/netpoll.c | 10 +++++-----
net/core/pktgen.c | 16 ++++++++--------
net/core/rtnetlink.c | 2 +-
net/core/skbuff.c | 26 +++++++++++++-------------
net/core/sock.c | 32 ++++++++++++++++----------------
net/dccp/ipv6.c | 2 +-
net/decnet/dn_neigh.c | 2 +-
net/ipv4/af_inet.c | 2 +-
net/ipv4/cipso_ipv4.c | 4 ++--
net/ipv4/devinet.c | 2 +-
net/ipv4/esp4.c | 2 +-
net/ipv4/igmp.c | 10 +++++-----
net/ipv4/inet_connection_sock.c | 2 +-
net/ipv4/inet_fragment.c | 14 +++++++-------
net/ipv4/inet_hashtables.c | 4 ++--
net/ipv4/inet_timewait_sock.c | 8 ++++----
net/ipv4/inetpeer.c | 18 +++++++++---------
net/ipv4/ip_fragment.c | 2 +-
net/ipv4/ip_output.c | 6 +++---
net/ipv4/ping.c | 4 ++--
net/ipv4/raw.c | 2 +-
net/ipv4/syncookies.c | 2 +-
net/ipv4/tcp.c | 4 ++--
net/ipv4/tcp_fastopen.c | 2 +-
net/ipv4/tcp_ipv4.c | 4 ++--
net/ipv4/tcp_offload.c | 2 +-
net/ipv4/tcp_output.c | 15 +++++++--------
net/ipv4/udp.c | 6 +++---
net/ipv4/udp_diag.c | 4 ++--
net/ipv6/calipso.c | 4 ++--
net/ipv6/datagram.c | 2 +-
net/ipv6/esp6.c | 2 +-
net/ipv6/inet6_hashtables.c | 4 ++--
net/ipv6/ip6_output.c | 4 ++--
net/ipv6/syncookies.c | 2 +-
net/ipv6/tcp_ipv6.c | 6 +++---
net/ipv6/udp.c | 4 ++--
net/kcm/kcmproc.c | 2 +-
net/key/af_key.c | 8 ++++----
net/l2tp/l2tp_debugfs.c | 3 +--
net/llc/llc_conn.c | 8 ++++----
net/llc/llc_sap.c | 2 +-
net/netfilter/xt_TPROXY.c | 4 ++--
net/netlink/af_netlink.c | 14 +++++++-------
net/packet/af_packet.c | 14 +++++++-------
net/packet/internal.h | 4 +++-
net/phonet/socket.c | 4 ++--
net/rds/tcp_send.c | 2 +-
net/rxrpc/af_rxrpc.c | 6 +++---
net/rxrpc/skbuff.c | 12 ++++++------
net/sched/em_meta.c | 2 +-
net/sched/sch_atm.c | 2 +-
net/sctp/output.c | 2 +-
net/sctp/outqueue.c | 2 +-
net/sctp/proc.c | 2 +-
net/sctp/socket.c | 6 +++---
net/tipc/socket.c | 2 +-
net/unix/af_unix.c | 16 ++++++++--------
105 files changed, 321 insertions(+), 322 deletions(-)

--
2.7.4