Change dup2 call to dup3

We changed syscalls to allow dup3 for ARM64.

Updates #1198

PiperOrigin-RevId: 297870816

1 files changed, 2 insertions, 2 deletions

diff --git a/pkg/sentry/fsimpl/gofer/gofer.go b/pkg/sentry/fsimpl/gofer/gofer.go
index d00850e25..c4a8f0b38 100644
--- a/pkg/sentry/fsimpl/gofer/gofer.go
+++ b/pkg/sentry/fsimpl/gofer/gofer.go
@@ -1045,13 +1045,13 @@ func (d *dentry) ensureSharedHandle(ctx context.Context, read, write, trunc bool
 				// using the old file descriptor, preventing us from safely
 				// closing it. We could handle this by invalidating existing
 				// memmap.Translations, but this is expensive. Instead, use
-				// dup2() to make the old file descriptor refer to the new file
+				// dup3 to make the old file descriptor refer to the new file
 				// description, then close the new file descriptor (which is no
 				// longer needed). Racing callers may use the old or new file
 				// description, but this doesn't matter since they refer to the
 				// same file (unless d.fs.opts.overlayfsStaleRead is true,
 				// which we handle separately).
-				if err := syscall.Dup2(int(h.fd), int(d.handle.fd)); err != nil {
+				if err := syscall.Dup3(int(h.fd), int(d.handle.fd), 0); err != nil {
 					d.handleMu.Unlock()
 					ctx.Warningf("gofer.dentry.ensureSharedHandle: failed to dup fd %d to fd %d: %v", h.fd, d.handle.fd, err)
 					h.close(ctx)