Fix typo in README

README.md

@@ -1,4 +1,4 @@
-libgocryptfs is a re-desing of the original [gocryptfs](https://github.com/rfjakob/gocryptfs) code to work as a library. Volumes are not mounted with [FUSE](https://www.kernel.org/doc/html/latest/filesystems/fuse.html) but rather opened in memory and accessed through API calls. What the purpose ?
+libgocryptfs is a re-design of the original [gocryptfs](https://github.com/rfjakob/gocryptfs) code to work as a library. Volumes are not mounted with [FUSE](https://www.kernel.org/doc/html/latest/filesystems/fuse.html) but rather opened in memory and accessed through API calls. What the purpose ?
 - Allow the use of gocryptfs in embedded devices where FUSE is not available (such as Android)
 - Reduce attack surface by restricting volumes access to only one process rather than one user
 

common_ops.go

@@ -10,27 +10,27 @@ import (
 )
 
 //export gcf_get_attrs
-func gcf_get_attrs(sessionID int, relPath string) (uint64, int64, bool) {
+func gcf_get_attrs(sessionID int, relPath string) (uint32, uint64, uint64, bool) {
 	value, ok := OpenedVolumes.Load(sessionID)
 	if !ok {
-		return 0, 0, false
+		return 0, 0, 0, false
 	}
 	volume := value.(*Volume)
 	dirfd, cName, err := volume.prepareAtSyscall(relPath)
 	if err != nil {
-		return 0, 0, false
+		return 0, 0, 0, false
 	}
 	defer syscall.Close(dirfd)
 
 	st, err := syscallcompat.Fstatat2(dirfd, cName, unix.AT_SYMLINK_NOFOLLOW)
 	if err != nil {
-		return 0, 0, false
+		return 0, 0, 0, false
 	}
 
 	// Translate ciphertext size to plaintext size
 	size := volume.translateSize(dirfd, cName, st)
 
-	return size, int64(st.Mtim.Sec), true
+	return st.Mode, size, uint64(st.Mtim.Sec), true
 }
 
 // libgocryptfs: using Renameat instead of Renameat2 to support older kernels

directory.go

@@ -77,7 +77,7 @@ func gcf_list_dir(sessionID int, dirName string) (*C.char, *C.int, C.int) {
 	// Filter and decrypt filenames
 	for i := range cipherEntries {
 		cName := cipherEntries[i].Name
-		if dirName == "" && cName == configfile.ConfDefaultName {
+		if dirName == "/" && cName == configfile.ConfDefaultName {
 			// silently ignore "gocryptfs.conf" in the top level dir
 			continue
 		}

file.go

@@ -328,7 +328,7 @@ func (volume *Volume) truncate(handleID int, newSize uint64) bool {
 	}
 	// We need the old file size to determine if we are growing or shrinking
 	// the file
-	oldSize, _, success := gcf_get_attrs(volume.volumeID, f.path)
+	_, oldSize, _, success := gcf_get_attrs(volume.volumeID, f.path)
 	if !success {
 		return false
 	}
@@ -426,13 +426,18 @@ func gcf_open_write_mode(sessionID int, path string, mode uint32) int {
 }
 
 //export gcf_truncate
-func gcf_truncate(sessionID int, handleID int, offset uint64) bool {
+func gcf_truncate(sessionID int, path string, offset uint64) bool {
 	value, ok := OpenedVolumes.Load(sessionID)
 	if !ok {
 		return false
 	}
 	volume := value.(*Volume)
-	return volume.truncate(handleID, offset)
+	for handleID, file := range volume.fileHandles {
+		if file.path == path {
+			return volume.truncate(handleID, offset)
+		}
+	}
+	return false
 }
 
 //export gcf_read_file

helpers.go

@@ -33,7 +33,7 @@ func (volume *Volume) isFiltered(path string) bool {
 }
 
 func (volume *Volume) prepareAtSyscall(path string) (dirfd int, cName string, err error) {
-	if path == "" {
+	if path == "/" {
 		return volume.prepareAtSyscallMyself(path)
 	}
 
@@ -111,7 +111,7 @@ func (volume *Volume) prepareAtSyscallMyself(path string) (dirfd int, cName stri
 	dirfd = -1
 
 	// Handle root node
-	if path == "" {
+	if path == "/" {
 		var err error
 		// Open cipherdir (following symlinks)
 		dirfd, err = syscallcompat.Open(volume.rootCipherDir, syscall.O_DIRECTORY|syscallcompat.O_PATH, 0)