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net/dns/resolver: add fuzz/unit test for #2533 (#5018)

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Signed-off-by: Andrew Dunham <andrew@du.nham.ca>
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Andrew Dunham 2022-07-08 14:22:50 +01:00 committed by GitHub
parent 3709074e55
commit c7993d2b88
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1 changed files with 58 additions and 0 deletions
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58
net/dns/resolver/forwarder_test.go
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@ -201,3 +201,61 @@ func BenchmarkNameFromQuery(b *testing.B) {
}
}
}
// Reproduces https://github.com/tailscale/tailscale/issues/2533
// Fixed by https://github.com/tailscale/tailscale/commit/f414a9cc01f3264912513d07c0244ff4f3e4ba54
//
// NOTE: fuzz tests act like unit tests when run without `-fuzz`
func FuzzClampEDNSSize(f *testing.F) {
// Empty DNS packet
f.Add([]byte{
// query id
0x12, 0x34,
// flags: standard query, recurse
0x01, 0x20,
// num questions
0x00, 0x00,
// num answers
0x00, 0x00,
// num authority RRs
0x00, 0x00,
// num additional RRs
0x00, 0x00,
})
// Empty OPT
f.Add([]byte{
// header
0xaf, 0x66, 0x01, 0x20, 0x00, 0x01, 0x00, 0x00,
0x00, 0x00, 0x00, 0x01,
// query
0x06, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x03, 0x63, 0x6f,
0x6d, 0x00, 0x00, 0x01, 0x00, 0x01,
// OPT
0x00, // name: <root>
0x00, 0x29, // type: OPT
0x10, 0x00, // UDP payload size
0x00, // higher bits in extended RCODE
0x00, // EDNS0 version
0x80, 0x00, // "Z" field
0x00, 0x00, // data length
})
// Query for "google.com"
f.Add([]byte{
// header
0xaf, 0x66, 0x01, 0x20, 0x00, 0x01, 0x00, 0x00,
0x00, 0x00, 0x00, 0x01,
// query
0x06, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x03, 0x63, 0x6f,
0x6d, 0x00, 0x00, 0x01, 0x00, 0x01,
// OPT
0x00, 0x00, 0x29, 0x10, 0x00, 0x00, 0x00, 0x80, 0x00, 0x00,
0x0c, 0x00, 0x0a, 0x00, 0x08, 0x62, 0x18, 0x1a, 0xcb, 0x19,
0xd7, 0xee, 0x23,
})
f.Fuzz(func(t *testing.T, data []byte) {
clampEDNSSize(data, maxResponseBytes)
})
}