Add O_PATH support in vfs2

PiperOrigin-RevId: 354367665

1 files changed, 12 insertions, 0 deletions

diff --git a/pkg/sentry/vfs/vfs.go b/pkg/sentry/vfs/vfs.go
index 6fd1bb0b2..0aff2dd92 100644
--- a/pkg/sentry/vfs/vfs.go
+++ b/pkg/sentry/vfs/vfs.go
@@ -425,6 +425,18 @@ func (vfs *VirtualFilesystem) OpenAt(ctx context.Context, creds *auth.Credential
 		rp.mustBeDir = true
 		rp.mustBeDirOrig = true
 	}
+	if opts.Flags&linux.O_PATH != 0 {
+		vd, err := vfs.GetDentryAt(ctx, creds, pop, &GetDentryOptions{})
+		if err != nil {
+			return nil, err
+		}
+		fd := &opathFD{}
+		if err := fd.vfsfd.Init(fd, opts.Flags, vd.Mount(), vd.Dentry(), &FileDescriptionOptions{}); err != nil {
+			return nil, err
+		}
+		vd.DecRef(ctx)
+		return &fd.vfsfd, err
+	}
 	for {
 		fd, err := rp.mount.fs.impl.OpenAt(ctx, rp, *opts)
 		if err == nil {