libutil: avoid an out-of-bounds read in trimdomain(3)
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Authored by kevans on Jan 9 2026, 5:00 PM.

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Reviewers

brooks
jrtc27
olce
des

Group Reviewers

Klara

Commits

rGf268f95955f5: libutil: avoid an out-of-bounds read in trimdomain(3)

Summary

memchr(3) will happily believe we've passed in a valid object, but
hostsize could easily exceed the bounds of fullhost. Clamp it down to
the string size to be safe and avoid UB.

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Repository

rG FreeBSD src repository

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Unit

Tests Not Applicable

Event Timeline

kevans created this revision.Jan 9 2026, 5:00 PM

Herald added a reviewer: olce. · View Herald TranscriptJan 9 2026, 5:00 PM

Herald added a subscriber: imp. · View Herald Transcript

kevans requested review of this revision.Jan 9 2026, 5:00 PM

Harbormaster completed remote builds in B69766: Diff 169405.Jan 9 2026, 5:00 PM

kevans added a parent revision: D54622: libutil: take a size_t in trimdomain().Jan 9 2026, 5:00 PM

des accepted this revision.Feb 17 2026, 5:02 PM

This revision is now accepted and ready to land.Feb 17 2026, 5:02 PM

Closed by commit rGf268f95955f5: libutil: avoid an out-of-bounds read in trimdomain(3) (authored by kevans). · Explain WhyTue, Mar 3, 10:51 PM

This revision was automatically updated to reflect the committed changes.

kevans added a commit: rGf268f95955f5: libutil: avoid an out-of-bounds read in trimdomain(3).

Revision Contents
Changeset List

Path

Size

lib/

libutil/

tests/

trimdomain_test.c

4 lines

trimdomain.c

6 lines

Diff 173088

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lib/libutil/tests/trimdomain_test.c