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| author | Eric Dumazet <edumazet@google.com> | 2019-03-27 18:21:30 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-04-17 09:36:46 +0300 |
| commit | 6996763856e1fb27ccae260e41fd73a3fff56678 (patch) | |
| tree | a7d4f6375b56d40e809942bfac19dbe782cbef0a /include/net/net_namespace.h | |
| parent | 9a739f1ad0b12f73afc176b2788c6d0f4e9cc739 (diff) | |
| download | linux-6996763856e1fb27ccae260e41fd73a3fff56678.tar.xz | |
netns: provide pure entropy for net_hash_mix()
[ Upstream commit 355b98553789b646ed97ad801a619ff898471b92 ]
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/net/net_namespace.h')
| -rw-r--r-- | include/net/net_namespace.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h index c05db6ff2515..0cdafe3935a6 100644 --- a/include/net/net_namespace.h +++ b/include/net/net_namespace.h @@ -53,6 +53,7 @@ struct net { */ spinlock_t rules_mod_lock; + u32 hash_mix; atomic64_t cookie_gen; struct list_head list; /* list of network namespaces */ |