random: set up the NUMA crng instances after the CRNG is fully initialized

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commit 8ef35c866f upstream.

Until the primary_crng is fully initialized, don't initialize the NUMA
crng nodes.  Otherwise users of /dev/urandom on NUMA systems before
the CRNG is fully initialized can get very bad quality randomness.  Of
course everyone should move to getrandom(2) where this won't be an
issue, but there's a lot of legacy code out there.  This related to
CVE-2018-1108.

Reported-by: Jann Horn <jannh@google.com>
Fixes: 1e7f583af6 ("random: make /dev/urandom scalable for silly...")
Cc: stable@kernel.org # 4.8+
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Theodore Ts'o 2018-04-11 15:23:56 -04:00 • committed by Greg Kroah-Hartman

parent ae0db58dab

commit 812b51a630

1 changed files with 27 additions and 19 deletions

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46

drivers/char/random.c

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