Theodore Ts'o a1cca5558b
random: make 'add_interrupt_randomness()' do something sane ...
commit 775f4b297b780601e61787b766f306ed3e1d23eb upstream.
We've been moving away from add_interrupt_randomness() for various
reasons: it's too expensive to do on every interrupt, and flooding the
CPU with interrupts could theoretically cause bogus floods of entropy
from a somewhat externally controllable source.
This solves both problems by limiting the actual randomness addition
to just once a second or after 64 interrupts, whicever comes first.
During that time, the interrupt cycle data is buffered up in a per-cpu
pool. Also, we make sure the the nonblocking pool used by urandom is
initialized before we start feeding the normal input pool. This
assures that /dev/urandom is returning unpredictable data as soon as
possible.
(Based on an original patch by Linus, but significantly modified by
tytso.)
Tested-by: Eric Wustrow <ewust@umich.edu >
Reported-by: Eric Wustrow <ewust@umich.edu >
Reported-by: Nadia Heninger <nadiah@cs.ucsd.edu >
Reported-by: Zakir Durumeric <zakir@umich.edu >
Reported-by: J. Alex Halderman <jhalderm@umich.edu >
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org >
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu >
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org >
Signed-off-by: Ed Tam <etam@google.com >
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a1cca5558b