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Eric Dumazet bbbe0024f4 netns: provide pure entropy for net_hash_mix()

[ Upstream commit 355b985537 ]

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2023-05-15 12:22:38 +09:00

conntrack.h

netfilter: remove ip_conntrack* sysctl compat code

2016-08-13 13:27:13 +02:00

core.h

percpu: add __percpu sparse annotations to net

2010-02-16 23:05:38 -08:00

dccp.h

[NETNS][DCCPV6]: Move the dccp_v6_ctl_sk on the struct net.

2008-04-13 22:32:25 -07:00

generic.h

netns: remove BUG_ONs from net_generic()