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fuzz: add types.ParseCoin #8513

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Mar 22, 2021
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20 changes: 20 additions & 0 deletions fuzz/README.md
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# Fuzzing

## Installation

```
go get -u github.com/dvyukov/go-fuzz/go-fuzz github.com/dvyukov/go-fuzz/go-fuzz-build
```

## Preparing

Create own go package under `fuzz` directory, which contains the function that you want to fuzz. See `fuzz/types/ParseCoin`
for example, which has example for how to generating corpus and directory structure.

## Running

```
$ cd types/ParseCoin
$ go-fuzz-build
$ go-fuzz
```
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10sssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssss
1 change: 1 addition & 0 deletions fuzz/types/ParseCoin/corpus/leading_space.seed
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10stake
1 change: 1 addition & 0 deletions fuzz/types/ParseCoin/corpus/less_than_3char_denom.seed
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10s
1 change: 1 addition & 0 deletions fuzz/types/ParseCoin/corpus/minus_sign.seed
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-10stake
1 change: 1 addition & 0 deletions fuzz/types/ParseCoin/corpus/no_denom.seed
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10
1 change: 1 addition & 0 deletions fuzz/types/ParseCoin/corpus/plus_sign.seed
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+10stake
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10 stake
1 change: 1 addition & 0 deletions fuzz/types/ParseCoin/corpus/trailing_space.seed
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10stake
1 change: 1 addition & 0 deletions fuzz/types/ParseCoin/corpus/valid.seed
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10stake
13 changes: 13 additions & 0 deletions fuzz/types/ParseCoin/fuzz.go
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package parsecoin

import (
"github.com/cosmos/cosmos-sdk/types"
)

func Fuzz(data []byte) int {
_, err := types.ParseCoin(string(data))
if err != nil {
return 0
}
return 1
}
40 changes: 40 additions & 0 deletions fuzz/types/ParseCoin/generate/generate.go
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package main

import (
"fmt"
"log"
"os"
"strings"
)

func main() {
seeds := []struct {
name string
coin string
}{
{"valid", "10stake"},
{"space_between_amount_denom", "10 stake"},
{"leading_space", " 10stake"},
{"trailing_space", "10stake "},
{"plus_sign", "+10stake"},
{"minus_sign", "-10stake"},
{"no_denom", "10"},
{"less_than_3char_denom", "10s"},
{"greater_than_128char_denom", "10" + strings.Repeat("s", 129)},
}

for _, seed := range seeds {
func() {
f, err := os.Create(fmt.Sprintf("corpus/%s.seed", seed.name))
if err != nil {
return
}
if _, err := f.Write([]byte(seed.coin)); err != nil {
log.Fatal(err)
}
if err := f.Close(); err != nil {
log.Fatal(err)
}
}()
}
}
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