From c8893f8f46af96bd61cb4251b8147c17aa7304b4 Mon Sep 17 00:00:00 2001
From: Vincent Batts <vbatts@hashbangbash.com>
Date: Wed, 30 May 2018 13:28:42 -0400
Subject: [PATCH] Initial commit

Signed-off-by: Vincent Batts <vbatts@hashbangbash.com>
---
 main.go | 82 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 82 insertions(+)
 create mode 100644 main.go

diff --git a/main.go b/main.go
new file mode 100644
index 0000000..dad5ecc
--- /dev/null
+++ b/main.go
@@ -0,0 +1,82 @@
+package main
+
+import (
+	"fmt"
+	"io"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"time"
+
+	"github.com/sirupsen/logrus"
+)
+
+var (
+	dirs   = []string{"/sys", "/proc"}
+	fuzzes = map[string]FuzzFunc{
+		"chmod":      chmodFuzz,
+		"read":       readFuzz,
+		"writeBytes": writeBytesFuzz,
+		"writeNum":   writeNumFuzz,
+	}
+	fuzzTimeout = 500 * time.Millisecond
+)
+
+func main() {
+	for _, dir := range dirs {
+		err := filepath.Walk(dir, func(path string, info os.FileInfo, err error) error {
+			if err != nil {
+				return err
+			}
+			if !info.Mode().IsRegular() {
+				return nil
+			}
+			for fname, fuzz := range fuzzes {
+				if err := fuzz(path, info, fuzzTimeout); err != nil {
+					logrus.Warnf("%s: %q fuzz failed with: %v", path, fname, err)
+				}
+			}
+			return nil
+		})
+		if err != nil {
+			logrus.Warnf("%s: %v", dir, err)
+		}
+	}
+}
+
+type FuzzFunc func(path string, info os.FileInfo, timeout time.Duration) error
+
+func readFuzz(path string, info os.FileInfo, timeout time.Duration) error {
+	c1 := make(chan error, 1)
+	go func() {
+		fd, err := os.Open(path)
+		if err != nil {
+			c1 <- err
+		}
+		defer fd.Close()
+		_, err = io.Copy(ioutil.Discard, fd)
+		c1 <- err
+	}()
+
+	select {
+	case err := <-c1:
+		return err
+	case <-time.After(timeout):
+		return fmt.Errorf("timeout reached")
+	}
+	return nil
+}
+
+func writeNumFuzz(path string, info os.FileInfo, timeout time.Duration) error {
+	return nil
+}
+
+func writeBytesFuzz(path string, info os.FileInfo, timeout time.Duration) error {
+	return nil
+}
+
+func chmodFuzz(path string, info os.FileInfo, timeout time.Duration) error {
+	return nil
+}
+
+// maybe have an ioctl fuzzer