Report filesystem-specific mount options.

PiperOrigin-RevId: 362406813

2 files changed, 10 insertions, 0 deletions

diff --git a/pkg/sentry/fsimpl/tmpfs/filesystem.go b/pkg/sentry/fsimpl/tmpfs/filesystem.go
index 4f675c21e..5fdca1d46 100644
--- a/pkg/sentry/fsimpl/tmpfs/filesystem.go
+++ b/pkg/sentry/fsimpl/tmpfs/filesystem.go
@@ -898,3 +898,8 @@ func (fs *filesystem) PrependPath(ctx context.Context, vfsroot, vd vfs.VirtualDe
 		d = d.parent
 	}
 }
+
+// MountOptions implements vfs.FilesystemImpl.MountOptions.
+func (fs *filesystem) MountOptions() string {
+	return fs.mopts
+}
diff --git a/pkg/sentry/fsimpl/tmpfs/tmpfs.go b/pkg/sentry/fsimpl/tmpfs/tmpfs.go
index a01e413e0..8df81f589 100644
--- a/pkg/sentry/fsimpl/tmpfs/tmpfs.go
+++ b/pkg/sentry/fsimpl/tmpfs/tmpfs.go
@@ -70,6 +70,10 @@ type filesystem struct {
 	// devMinor is the filesystem's minor device number. devMinor is immutable.
 	devMinor uint32
 
+	// mopts contains the tmpfs-specific mount options passed to this
+	// filesystem. Immutable.
+	mopts string
+
 	// mu serializes changes to the Dentry tree.
 	mu sync.RWMutex `state:"nosave"`
 
@@ -184,6 +188,7 @@ func (fstype FilesystemType) GetFilesystem(ctx context.Context, vfsObj *vfs.Virt
 		mfp:      mfp,
 		clock:    clock,
 		devMinor: devMinor,
+		mopts:    opts.Data,
 	}
 	fs.vfsfs.Init(vfsObj, newFSType, &fs)