[PATCH 0/2] random: fix write locking for crng_init

Dominik Brodowski
2022-02-05T10:35:15Z

According to a comment in random.c, crng_init is protected by
primary_crng->lock. These two patches fix the locking for
writing tp (that is: increasing) crng_init in call sites where it
may matter. At rand_initialize() time (precisely: either in
crng_initialize_primary() or in crng_finalize_init()), crng_init
is set to 2 without the lock being held. However, then the
kernel is running with IRQs disabled and only the boot CPU
active (but not yet in PID 1).

Dominik Brodowski (2):
random: fix locking in crng_fast_load()
random: fix locking for crng_init in crng_reseed()

drivers/char/random.c | 25 ++++++++++++++++++-------
1 file changed, 18 insertions(+), 7 deletions(-)

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2.35.1