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Differential D31197

lio_listio: Don't post a completion notification if none was requested
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Authored by markj on Jul 15 2021, 6:11 PM.
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rG2e5f6152952e: lio_listio: Don't post a completion notification if none was requested
Summary

One is allowed to use LIO_NOWAIT without specifying a sigevent. In this
case, lj->lioj_signal is left uninitialized, but several code paths
examine liov_signal.sigev_notify to figure out which notification to
post. Unconditionally initialize that field to SIGEV_NONE.

Add a dumb test case which triggers the bug.

Reported by: KMSAN+syzkaller
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation

Diff Detail

Repository
rG FreeBSD src repository
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Lint Not Applicable
Unit
Tests Not Applicable

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PathSize
sys/
kern/
1 line
tests/
sys/
aio/
10 lines

Diff 92266

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sys/kern/vfs_aio.c

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tests/sys/aio/lio_test.c

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