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

Event Timeline

markj created this revision.Jul 15 2021, 6:11 PM

Herald added a subscriber: imp. · View Herald TranscriptJul 15 2021, 6:11 PM

markj requested review of this revision.Jul 15 2021, 6:11 PM

Harbormaster completed remote builds in B40491: Diff 92243.Jul 15 2021, 6:11 PM

Nice catch, KMSAN!

This revision is now accepted and ready to land.Jul 15 2021, 6:16 PM

Closed by commit rG2e5f6152952e: lio_listio: Don't post a completion notification if none was requested (authored by markj). · Explain WhyJul 16 2021, 2:42 AM

This revision was automatically updated to reflect the committed changes.

markj added a commit: rG2e5f6152952e: lio_listio: Don't post a completion notification if none was requested.

Revision Contents
Changeset List

Path

Size

sys/

kern/

1 line

tests/

sys/

aio/

10 lines

Diff 92266

sys/kern/vfs_aio.c

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tests/sys/aio/lio_test.c

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