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author | Eric Dumazet <edumazet@google.com> | 2019-03-27 08:21:30 -0700 |
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committer | David S. Miller <davem@davemloft.net> | 2019-03-28 17:00:45 -0700 |
commit | 355b98553789b646ed97ad801a619ff898471b92 (patch) | |
tree | 433cd3a5856dfdcc1022cb5cc2e7c1aa0bf383e3 /net/ipv6 | |
parent | 6289d0facd9ebce4cc83e5da39e15643ee998dc5 (diff) | |
download | linux-355b98553789b646ed97ad801a619ff898471b92.tar.bz2 |
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: 0b4419162aa6 ("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>
Diffstat (limited to 'net/ipv6')
0 files changed, 0 insertions, 0 deletions