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| author | Eric Dumazet <edumazet@google.com> | 2019-03-27 08:21:30 -0700 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2019-07-09 22:04:22 +0100 |
| commit | 188da790e1f4d164bcfdea486e91fd47e1ba59c5 (patch) | |
| tree | 4ce30ff09f637f1bf7151d5095cf3e5a4192d44a /Makefile | |
| parent | a62393d7eb63bd075c51154002825cc7ab4dd3eb (diff) | |
| download | linux-stable-188da790e1f4d164bcfdea486e91fd47e1ba59c5.tar.gz linux-stable-188da790e1f4d164bcfdea486e91fd47e1ba59c5.tar.bz2 linux-stable-188da790e1f4d164bcfdea486e91fd47e1ba59c5.zip | |
netns: provide pure entropy for net_hash_mix()
commit 355b98553789b646ed97ad801a619ff898471b92 upstream.
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>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'Makefile')
0 files changed, 0 insertions, 0 deletions