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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 and the decompressed data it may read, plus room for the decoder's window buffers. make test runs the seed corpus; make fuzz fuzzes for one minute. Parser bug: MaxDecompressedSize did not bound decompression. The zstd decoder decoded a payload under 128 KiB in full before the LimitReader read any of it. It now decodes synchronously, only what the LimitReader reads, and refuses windows over the 8 MiB mfer writes with, since each frame asking for a larger window gets a new buffer. Seeds: a frame claiming 8 GiB, two frames together over the limit, empty frames with growing windows. 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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