linux/include/net/netns
Eric Dumazet 355b985537 netns: provide pure entropy for net_hash_mix()
net_hash_mix() currently uses kernel address of a struct net,
and is used in many places that could be used to reveal this
address to a patient attacker, thus defeating KASLR, for
the typical case (initial net namespace, &init_net is
not dynamically allocated)

I believe the original implementation tried to avoid spending
too many cycles in this function, but security comes first.

Also provide entropy regardless of CONFIG_NET_NS.

Fixes: 0b4419162a ("netns: introduce the net_hash_mix "salt" for hashes")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Amit Klein <aksecurity@gmail.com>
Reported-by: Benny Pinkas <benny@pinkas.net>
Cc: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2019-03-28 17:00:45 -07:00
..
can.h can: af_can: give struct holding the CAN per device receive lists a sensible name 2018-01-05 11:12:08 +01:00
conntrack.h netfilter: conntrack: remove l4proto init and get_net callbacks 2019-01-18 15:02:34 +01:00
core.h sock: Hide unused variable when !CONFIG_PROC_FS. 2017-12-19 09:58:14 -05:00
dccp.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
generic.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
hash.h netns: provide pure entropy for net_hash_mix() 2019-03-28 17:00:45 -07:00
ieee802154_6lowpan.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ipv4.h net: provide a sysctl raw_l3mdev_accept for raw socket lookup with VRFs 2018-11-07 16:12:38 -08:00
ipv6.h ipv6: icmp: use percpu allocation 2019-02-24 21:57:26 -08:00
mib.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
mpls.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
netfilter.h netfilter: don't allocate space for arp/bridge hooks unless needed 2018-01-08 18:01:11 +01:00
nftables.h netfilter: nf_tables: use dedicated mutex to guard transactions 2018-07-18 11:26:48 +02:00
packet.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
sctp.h sctp: add stream interleave enable members and sockopt 2017-12-11 11:23:04 -05:00
unix.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
x_tables.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
xdp.h net: xsk: track AF_XDP sockets on a per-netns list 2019-01-25 01:50:03 +01:00
xfrm.h xfrm: policy: store inexact policies in an rhashtable 2018-11-09 11:57:47 +01:00