Update the list of unsafe functions detected by the unsafe rule (#1033)

Signed-off-by: Cosmin Cojocar <gcojocar@adobe.com>

rules/unsafe.go

@@ -43,7 +43,7 @@ func (r *usingUnsafe) Match(n ast.Node, c *gosec.Context) (gi *issue.Issue, err
 func NewUsingUnsafe(id string, _ gosec.Config) (gosec.Rule, []ast.Node) {
 	return &usingUnsafe{
 		pkg:   "unsafe",
-		calls: []string{"Alignof", "Offsetof", "Sizeof", "Pointer"},
+		calls: []string{"Pointer", "String", "StringData", "Slice", "SliceData"},
 		MetaData: issue.MetaData{
 			ID:         id,
 			What:       "Use of unsafe calls should be audited",

testutils/source.go

@@ -442,10 +442,43 @@ func main() {
   fmt.Printf("\nintArray: %v\n", intArray)
   intPtr := &intArray[0]
   fmt.Printf("\nintPtr=%p, *intPtr=%d.\n", intPtr, *intPtr)
-   	addressHolder := uintptr(unsafe.Pointer(intPtr)) + unsafe.Sizeof(intArray[0])
+  addressHolder := uintptr(unsafe.Pointer(intPtr)) 
   intPtr = (*int)(unsafe.Pointer(addressHolder))
   fmt.Printf("\nintPtr=%p, *intPtr=%d.\n\n", intPtr, *intPtr)
-}`}, 3, gosec.NewConfig()},
+}`}, 2, gosec.NewConfig()},
+		{[]string{`
+package main
+
+import (
+	"fmt"
+	"unsafe"
+)
+
+func main() {
+  chars := [...]byte{1, 2}
+  charsPtr := &chars[0]
+  str := unsafe.String(charsPtr, len(chars))
+  fmt.Printf("%s\n", str)
+  ptr := unsafe.StringData(str)
+  fmt.Printf("ptr: %p\n", ptr)
+
+}`}, 2, gosec.NewConfig()},
+		{[]string{`
+package main
+
+import (
+	"fmt"
+	"unsafe"
+)
+
+func main() {
+  chars := [...]byte{1, 2}
+  charsPtr := &chars[0]
+  slice := unsafe.Slice(charsPtr, len(chars))
+  fmt.Printf("%v\n", slice)
+  ptr := unsafe.SliceData(slice)
+  fmt.Printf("ptr: %p\n", ptr)
+}`}, 2, gosec.NewConfig()},
 	}
 
 	// SampleCodeG104 finds errors that aren't being handled