fix(sign): reject invalid UTF‑8 dbfile token#7589
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The coredns/caddy lexer replaces invalid UTF‑8 bytes in tokens with U+FFFD. When that lossy-decoded value is used as `dbfile` in the sign plugin, the source zone file path never exists. On startup/refresh, the `resign()` function sees the signed file missing and triggers signing. Consequently `Sign()` then fails opening the bogus path, the signed file is never created, and the cycle repeats across all expanded origins (e.g., reverse CIDRs), causing unbounded churn/OOM. Validate `dbfile` in setup and error if it contains U+FFFD. Add a regression test. Note: Unicode paths are supported; only U+FFFD (replacement-rune) is rejected. Signed-off-by: Ville Vesilehto <ville@vesilehto.fi>
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@yongtang IMO this can flow to the next patch version, especially since the 1.13.0 notes are prepared already & pending for release run. |
Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## master #7589 +/- ##
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+ Coverage 55.70% 62.61% +6.91%
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Files 224 278 +54
Lines 10016 18571 +8555
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+ Hits 5579 11628 +6049
- Misses 3978 6257 +2279
- Partials 459 686 +227 ☔ View full report in Codecov by Sentry. 🚀 New features to boost your workflow:
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yongtang
approved these changes
Oct 6, 2025
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1. Why is this pull request needed and what does it do?
The coredns/caddy lexer replaces invalid UTF‑8 bytes in tokens with U+FFFD. When that lossy-decoded value is used as
dbfilein the sign plugin, the source zone file path never exists. On startup/refresh, theresign()function sees the signed file missing and triggers signing. ConsequentlySign()then fails opening the bogus path, the signed file is never created, and the cycle repeats across all expanded origins (e.g., reverse CIDRs), causing unbounded churn/OOM.Validate
dbfilein setup and error if it contains U+FFFD. Add a regression test.Note: Unicode paths are supported; only U+FFFD (replacement-rune) is rejected.
2. Which issues (if any) are related?
Fixes OSS-Fuzz finding #448571099 (not publicly accessible yet).
3. Which documentation changes (if any) need to be made?
None.
4. Does this introduce a backward incompatible change or deprecation?
No.