CVS commit: src/sys/kern

["Taylor R Campbell" <riastradh%netbsd.org@localhost>]

Module Name:    src
Committed By:   riastradh
Date:           Sun Mar 20 13:18:12 UTC 2022

Modified Files:
        src/sys/kern: kern_entropy.c

Log Message:
entropy(9): Fix another new race in entropy_account_cpu.

The consolidation xcall can preempt entropy_enter, between when it
unlocks the per-CPU state and when it calls entropy_account_cpu, with
the effect of setting ec->ec_pending=0.

Previously this was impossible because we called entropy_account_cpu
with the per-CPU state still locked, but that doesn't work now that
the global entropy lock is an adaptive lock which might sleep which
is forbidden while the per-CPU state is locked.


To generate a diff of this commit:
cvs rdiff -u -r1.45 -r1.46 src/sys/kern/kern_entropy.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.