kdb: Permit a NULL thread credential in kdb_backend_permitted()
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Authored by markj on Aug 1 2023, 4:56 PM.

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rGbd16c274c382: kdb: Permit a NULL thread credential in kdb_backend_permitted()

Summary

Early during boot, thread0 runs with td->td_ucred == NULL. This is
fixed up in proc0_init() at SI_SUB_INTRINSIC. If a panic occurs before
then, rather than dereference a NULL pointer, simply allow the thread to
enter KDB.

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rG FreeBSD src repository

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Event Timeline

markj created this revision.Aug 1 2023, 4:56 PM

Herald added a subscriber: imp. · View Herald TranscriptAug 1 2023, 4:56 PM

markj requested review of this revision.Aug 1 2023, 4:56 PM

Harbormaster completed remote builds in B52938: Diff 125434.Aug 1 2023, 4:56 PM

stevek accepted this revision.Aug 1 2023, 6:27 PM

This revision is now accepted and ready to land.Aug 1 2023, 6:27 PM

Checks out.

Closed by commit rGbd16c274c382: kdb: Permit a NULL thread credential in kdb_backend_permitted() (authored by markj). · Explain WhyAug 2 2023, 1:16 PM

This revision was automatically updated to reflect the committed changes.

markj added a commit: rGbd16c274c382: kdb: Permit a NULL thread credential in kdb_backend_permitted().

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sys/

kern/

subr_kdb.c

14 lines

Diff 125479

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kdb: Permit a NULL thread credential in kdb_backend_permitted()ClosedPublicActions