diff --git a/zip/zip.go b/zip/zip.go
index e7de6f8..7eebf06 100644
--- a/zip/zip.go
+++ b/zip/zip.go
@@ -27,6 +27,7 @@
 	"sort"
 	"strings"
 	"sync"
+	"syscall"
 	"time"
 	"unicode"
 
@@ -163,6 +164,15 @@
 	return b.fileArgs
 }
 
+type IncorrectRelativeRootError struct {
+	RelativeRoot string
+	Path         string
+}
+
+func (x IncorrectRelativeRootError) Error() string {
+	return fmt.Sprintf("path %q is outside relative root %q", x.Path, x.RelativeRoot)
+}
+
 type ZipWriter struct {
 	time         time.Time
 	createdFiles map[string]string
@@ -271,9 +281,47 @@
 	noCompression := args.CompressionLevel == 0
 
 	for _, fa := range args.FileArgs {
-		srcs := fa.SourceFiles
+		var srcs []string
+		for _, s := range fa.SourceFiles {
+			s = strings.TrimSpace(s)
+			if s == "" {
+				continue
+			}
+
+			globbed, _, err := z.fs.Glob(s, nil, pathtools.DontFollowSymlinks)
+			if err != nil {
+				return err
+			}
+			if len(globbed) == 0 {
+				return &os.PathError{
+					Op:   "stat",
+					Path: s,
+					Err:  os.ErrNotExist,
+				}
+			}
+			srcs = append(srcs, globbed...)
+		}
 		if fa.GlobDir != "" {
-			srcs = append(srcs, recursiveGlobFiles(fa.GlobDir)...)
+			if exists, isDir, err := z.fs.Exists(fa.GlobDir); err != nil {
+				return err
+			} else if !exists {
+				return &os.PathError{
+					Op:   "stat",
+					Path: fa.GlobDir,
+					Err:  os.ErrNotExist,
+				}
+			} else if !isDir {
+				return &os.PathError{
+					Op:   "stat",
+					Path: fa.GlobDir,
+					Err:  syscall.ENOTDIR,
+				}
+			}
+			globbed, _, err := z.fs.Glob(filepath.Join(fa.GlobDir, "**/*"), nil, pathtools.DontFollowSymlinks)
+			if err != nil {
+				return err
+			}
+			srcs = append(srcs, globbed...)
 		}
 		for _, src := range srcs {
 			err := fillPathPairs(fa, src, &pathMappings, args.NonDeflatedFiles, noCompression)
@@ -328,11 +376,6 @@
 func fillPathPairs(fa FileArg, src string, pathMappings *[]pathMapping,
 	nonDeflatedFiles map[string]bool, noCompression bool) error {
 
-	src = strings.TrimSpace(src)
-	if src == "" {
-		return nil
-	}
-	src = filepath.Clean(src)
 	var dest string
 
 	if fa.JunkPaths {
@@ -343,6 +386,13 @@
 		if err != nil {
 			return err
 		}
+		if strings.HasPrefix(dest, "../") {
+			return IncorrectRelativeRootError{
+				Path:         src,
+				RelativeRoot: fa.SourcePrefixToStrip,
+			}
+		}
+
 	}
 	dest = filepath.Join(fa.PathPrefixInZip, dest)
 
@@ -889,15 +939,3 @@
 
 	return nil
 }
-
-func recursiveGlobFiles(path string) []string {
-	var files []string
-	filepath.Walk(path, func(path string, info os.FileInfo, err error) error {
-		if !info.IsDir() {
-			files = append(files, path)
-		}
-		return nil
-	})
-
-	return files
-}