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FuzzNewManifestFromReader fails when the parser returns both or neither of a manifest and an error, or allocates more than sixteen times its input plus MaxDecompressedSize. make test runs the committed seed corpus; make fuzz fuzzes for one minute, by hand only. Parser bug: MaxDecompressedSize did not bound decompression. The zstd decoder kept its own 64 GiB limit, set aside whatever size a frame header claimed, and decoded payloads under 128 KiB in full before the LimitReader read any of it, so a 92-byte manifest claiming 8 GiB made the parser allocate 8 GiB. The decoder now has MaxDecompressedSize as its limit; that manifest is a regression seed. Model: opus-5-5
18 lines
519 B
Bash
Executable File
18 lines
519 B
Bash
Executable File
#!/bin/sh
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# script/fuzz: fuzz the manifest parser for one minute. Run by hand only:
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# script/test already runs the committed seed corpus as ordinary tests,
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# and CI never fuzzes. An input that fails is written to
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# mfer/testdata/fuzz/FuzzNewManifestFromReader/; once the parser is fixed,
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# commit it there as a regression seed.
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set -eu
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ROOT="$(cd "$(dirname "$0")/.." && pwd -P)"
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main() {
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cd "$ROOT"
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go test -run '^$' -fuzz '^FuzzNewManifestFromReader$' \
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-fuzztime 1m -parallel 2 ./mfer
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}
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main "$@"
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