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Use a explicit random src for RandomID. 

PiperOrigin-RevId: 327659759
This commit is contained in:
Bhasker Hariharan 2020-08-20 11:05:37 -07:00 committed by gVisor bot
parent d2e32395c1
commit 710adf23cd
1 changed files with 4 additions and 1 deletions
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5
pkg/test/testutil/testutil.go
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@ -243,12 +243,15 @@ func writeSpec(dir string, spec *specs.Spec) error {
return ioutil.WriteFile(filepath.Join(dir, "config.json"), b, 0755)
}
// idRandomSrc is a pseudo random generator used to in RandomID.
var idRandomSrc = rand.New(rand.NewSource(time.Now().UnixNano()))
// RandomID returns 20 random bytes following the given prefix.
func RandomID(prefix string) string {
// Read 20 random bytes.
b := make([]byte, 20)
// "[Read] always returns len(p) and a nil error." --godoc
if _, err := rand.Read(b); err != nil {
if _, err := idRandomSrc.Read(b); err != nil {
panic("rand.Read failed: " + err.Error())
}
if prefix != "" {