Module Name: src
Committed By: riastradh
Date: Sun Mar 20 14:30:57 UTC 2022
Modified Files:
src/sys/kern: kern_entropy.c
Log Message:
entropy(9): Fix premature optimization deadlock in entropy_request.
- For synchronous queries from /dev/random, which are waiting for
entropy to be ready, wait for concurrent access -- e.g., concurrent
rnd_detach_source -- to finish, and make sure to request entropy
from all sources (unless we're interrupted by a signal).
- When invoked through softint context (e.g., cprng_fast_intr ->
cprng_strong -> entropy_extract), don't wait, because we're
forbidden from waiting anyway.
- For entropy_bootrequest, wait but don't bother failing on signal
because this only happens in kthread context, not in userland
process context, so there can't be signals.
Nix rnd_trylock_sources; use the same entropy_extract flags
(ENTROPY_WAIT, ENTROPY_SIG) for rnd_lock_sources.
To generate a diff of this commit:
cvs rdiff -u -r1.48 -r1.49 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.
