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| author |   Hannes Frederic Sowa <hannes@stressinduktion.org> | 2013-11-11 12:20:33 +0100 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2013-11-11 14:32:14 -0500 |
| commit | 6d31920246a9fc80be4f16acd27c0bbe8d7b8494 (patch) | |
| tree | 59cf494b43a77fd528c77364c2376e65975a128a /drivers/char | |
| parent | random32: fix off-by-one in seeding requirement (diff) | |
| download | linux-dev-6d31920246a9fc80be4f16acd27c0bbe8d7b8494.tar.xz linux-dev-6d31920246a9fc80be4f16acd27c0bbe8d7b8494.zip | |
random32: add periodic reseeding
The current Tausworthe PRNG is never reseeded with truly random data after
the first attempt in late_initcall. As this PRNG is used for some critical
random data as e.g. UDP port randomization we should try better and reseed
the PRNG once in a while with truly random data from get_random_bytes().
When we reseed with prandom_seed we now make also sure to throw the first
output away. This suffices the reseeding procedure.
The delay calculation is based on a proposal from Eric Dumazet.
Joint work with Daniel Borkmann.
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/char')
0 files changed, 0 insertions, 0 deletions