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[dev.fuzz] internal/fuzz: write a newline to the end of a corpus file

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If someone manually adds/alters a corpus file to add
extra spacing or remove the final newline, the file
can still be decoded. However, this change ensures that
the fuzzing engine correctly writes the final newline.

Fixes golang/go#48130

Change-Id: Ib5556d4a6e4e0bfd9bc2edab357b7c25bedfd176
Reviewed-on: https://go-review.googlesource.com/c/go/+/349055
Trust: Katie Hockman <katie@golang.org>
Run-TryBot: Katie Hockman <katie@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
This commit is contained in:
Katie Hockman 2021-09-10 11:05:29 -04:00
parent 363f2f3df9
commit d106089fa6
3 changed files with 23 additions and 12 deletions
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12
src/internal/fuzz/encoding.go
View file

@ -22,21 +22,21 @@ func marshalCorpusFile(vals ...interface{}) []byte {
if len(vals) == 0 {
panic("must have at least one value to marshal")
}
b := bytes.NewBuffer([]byte(encVersion1))
b := bytes.NewBuffer([]byte(encVersion1 + "\n"))
// TODO(katiehockman): keep uint8 and int32 encoding where applicable,
// instead of changing to byte and rune respectively.
for _, val := range vals {
switch t := val.(type) {
case int, int8, int16, int64, uint, uint16, uint32, uint64, float32, float64, bool:
fmt.Fprintf(b, "\n%T(%v)", t, t)
fmt.Fprintf(b, "%T(%v)\n", t, t)
case string:
fmt.Fprintf(b, "\nstring(%q)", t)
fmt.Fprintf(b, "string(%q)\n", t)
case rune: // int32
fmt.Fprintf(b, "\nrune(%q)", t)
fmt.Fprintf(b, "rune(%q)\n", t)
case byte: // uint8
fmt.Fprintf(b, "\nbyte(%q)", t)
fmt.Fprintf(b, "byte(%q)\n", t)
case []byte: // []uint8
fmt.Fprintf(b, "\n[]byte(%q)", t)
fmt.Fprintf(b, "[]byte(%q)\n", t)
default:
panic(fmt.Sprintf("unsupported type: %T", t))
}