netmap: Fix a race in kqueue registration
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Authored by markj on Aug 5 2026, 5:37 PM.

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rG6420ead539dd: netmap: Fix a race in kqueue registration
rGbe37b1e0ba79: netmap: Fix a race in kqueue registration
rG6de818285f06: netmap: Fix a race in kqueue registration

Summary

We need to acquire the netmap global lock earlier, to avoid racing with
the NETMAP_REQ_REGISTER ioctl handler.

Reported by: syzkaller

Diff Detail

Repository

rG FreeBSD src repository

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Tests Not Applicable

Event Timeline

markj created this revision.Aug 5 2026, 5:37 PM

Herald added a subscriber: imp. · View Herald TranscriptAug 5 2026, 5:37 PM

markj requested review of this revision.Aug 5 2026, 5:37 PM

Harbormaster completed remote builds in B75396: Diff 183474.Aug 5 2026, 5:37 PM

markj added a parent revision: D58676: netmap: Fix driver name handling.Aug 5 2026, 5:37 PM

markj added a child revision: D58678: netmap: Handle overflow when computing ring sizes.

Looks good, thanks

This revision is now accepted and ready to land.Aug 6 2026, 7:13 AM

Closed by commit rG6de818285f06: netmap: Fix a race in kqueue registration (authored by markj). · Explain WhyAug 7 2026, 4:30 PM

This revision was automatically updated to reflect the committed changes.

markj added a commit: rG6de818285f06: netmap: Fix a race in kqueue registration.

markj added a commit: rGbe37b1e0ba79: netmap: Fix a race in kqueue registration.Mon, Aug 24, 4:30 PM

markj added a commit: rG6420ead539dd: netmap: Fix a race in kqueue registration.Mon, Aug 24, 6:49 PM

Revision Contents
Changeset List

Path

Size

sys/

dev/

netmap/

netmap_freebsd.c

12 lines

Diff 183629

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sys/dev/netmap/netmap_freebsd.c

netmap: Fix a race in kqueue registrationClosedPublicActions