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[fuzzer] Avoid fuzzing parser with line that contains "$INCLUDE" (#1026) 

Fixes #1025

```
GO111MODULE=off make -f Makefile.fuzz build
go-fuzz -bin=dns-fuzz.zip -workdir=fuzz -func Fuzz
GO111MODULE=off make -f Makefile.fuzz build-rr
go-fuzz -bin=dns-fuzz.zip -workdir=fuzz -func FuzzNewRR
```
This commit is contained in:
chantra 2019-10-09 23:12:53 -07:00 committed by Miek Gieben
parent 997f079b75
commit 40eab7a196
1 changed files with 10 additions and 1 deletions
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11
fuzz.go
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@ -2,6 +2,8 @@
package dns
import "strings"
func Fuzz(data []byte) int {
msg := new(Msg)
@ -16,7 +18,14 @@ func Fuzz(data []byte) int {
}
func FuzzNewRR(data []byte) int {
if _, err := NewRR(string(data)); err != nil {
str := string(data)
// Do not fuzz lines that include the $INCLUDE keyword and hint the fuzzer
// at avoiding them.
// See GH#1025 for context.
if strings.Contains(strings.ToUpper(str), "$INCLUDE") {
return -1
}
if _, err := NewRR(str); err != nil {
return 0
}
return 1