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Commit 05efa8c9 authored by Sasha Levin's avatar Sasha Levin Committed by David S. Miller
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random32: avoid attempt to late reseed if in the middle of seeding



Commit 4af712e8 ("random32: add prandom_reseed_late() and call when
nonblocking pool becomes initialized") has added a late reseed stage
that happens as soon as the nonblocking pool is marked as initialized.

This fails in the case that the nonblocking pool gets initialized
during __prandom_reseed()'s call to get_random_bytes(). In that case
we'd double back into __prandom_reseed() in an attempt to do a late
reseed - deadlocking on 'lock' early on in the boot process.

Instead, just avoid even waiting to do a reseed if a reseed is already
occuring.

Fixes: 4af712e8 ("random32: add prandom_reseed_late() and call when nonblocking pool becomes initialized")
Signed-off-by: default avatarSasha Levin <sasha.levin@oracle.com>
Acked-by: default avatarHannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: default avatarDaniel Borkmann <dborkman@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 335a67d2
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