Differential D50897

tcp: increase tcps_sc_recvcookie only in the syncache_expand()
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Authored by glebius on Jun 17 2025, 4:16 AM.

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rGea5560f2293b: tcp: increase tcps_sc_recvcookie only in the syncache_expand()
rG3ed8d5645dd4: tcp: increase tcps_sc_recvcookie only in the syncache_expand()

Summary

The syncookie_expand() is called from syncookie_cmp() in INVARIANTS mode
to confirm that values calculated via syncookies mechanism match those
stored in the syncache entry. This creates a counting bug, that with
INVARIANTS every successful use of syncache also counts as use of a
syncookie.

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rG FreeBSD src repository

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Event Timeline

glebius created this revision.Jun 17 2025, 4:16 AM

Herald added 1 blocking reviewer(s): transport. · View Herald TranscriptJun 17 2025, 4:16 AM

Herald added subscribers: melifaro, imp. · View Herald Transcript

glebius requested review of this revision.Jun 17 2025, 4:16 AM

Harbormaster completed remote builds in B64930: Diff 157159.Jun 17 2025, 4:16 AM

glebius added a parent revision: D50896: tcp: refactor debug function syncookie_cmp().Jun 17 2025, 4:16 AM

glebius added a child revision: D50898: tcp: unlock before syncookie_expand().

tuexen accepted this revision.Jun 17 2025, 6:43 AM

This revision is now accepted and ready to land.Jun 17 2025, 6:43 AM

Closed by commit rG3ed8d5645dd4: tcp: increase tcps_sc_recvcookie only in the syncache_expand() (authored by glebius). · Explain WhyJun 17 2025, 3:51 PM

This revision was automatically updated to reflect the committed changes.

glebius added a commit: rG3ed8d5645dd4: tcp: increase tcps_sc_recvcookie only in the syncache_expand().

tuexen added a commit: rGea5560f2293b: tcp: increase tcps_sc_recvcookie only in the syncache_expand().Sep 9 2025, 6:06 PM

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sys/

netinet/

5 lines

Diff 157194

sys/netinet/tcp_syncache.c

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