Enable access, chroot, chown, and sync tests for FUSE.

PiperOrigin-RevId: 510699649

pkg/sentry/fsimpl/fuse/file.go

@@ -144,9 +144,6 @@ func (fd *fileDescription) Sync(ctx context.Context) error {
 	inode := fd.inode()
 	inode.attrMu.Lock()
 	defer inode.attrMu.Unlock()
-	if inode.filemode().IsDir() {
-		return linuxerr.EPERM
-	}
 	conn := inode.fs.conn
 	// no need to proceed if FUSE server doesn't implement Open.
 	if conn.noOpen {

test/syscalls/BUILD

@@ -22,6 +22,7 @@ syscall_test(
 )
 
 syscall_test(
+    add_fusefs = True,
     add_overlay = True,
     test = "//test/syscalls/linux:access_test",
 )
@@ -79,17 +80,20 @@ syscall_test(
 
 syscall_test(
     size = "medium",
+    add_fusefs = True,
     add_overlay = True,
     test = "//test/syscalls/linux:chown_test",
     use_tmpfs = True,  # chown tests require gofer to be running as root.
 )
 
 syscall_test(
+    add_fusefs = True,
     add_overlay = True,
     test = "//test/syscalls/linux:chroot_test",
 )
 
 syscall_test(
+    add_fusefs = True,
     add_overlay = True,
     test = "//test/syscalls/linux:pivot_root_test",
     use_tmpfs = True,
@@ -143,6 +147,7 @@ syscall_test(
 )
 
 syscall_test(
+    add_fusefs = True,
     add_overlay = True,
     test = "//test/syscalls/linux:dup_test",
 )
@@ -224,6 +229,7 @@ syscall_test(
 )
 
 syscall_test(
+    add_fusefs = True,
     add_overlay = True,
     test = "//test/syscalls/linux:fsync_test",
 )
@@ -973,11 +979,13 @@ syscall_test(
 )
 
 syscall_test(
+    add_fusefs = True,
     add_overlay = True,
     test = "//test/syscalls/linux:sync_test",
 )
 
 syscall_test(
+    add_fusefs = True,
     add_overlay = True,
     test = "//test/syscalls/linux:sync_file_range_test",
 )

test/syscalls/linux/chroot.cc

@@ -310,6 +310,8 @@ TEST(ChrootTest, ProcMemSelfFdsNoEscapeProcOpen) {
 // expose the full file path via /proc/self/maps and instead honor the chroot.
 TEST(ChrootTest, ProcMemSelfMapsNoEscapeProcOpen) {
   SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_SYS_CHROOT)));
+  // TODO(b/264306751): Remove once FUSE implements mmap.
+  SKIP_IF(getenv("GVISOR_FUSE_TEST"));
 
   // Get a FD to /proc before we enter the chroot.
   const FileDescriptor proc =