diff options
| author | Fabricio Voznika <fvoznika@google.com> | 2020-04-10 15:46:16 -0700 |
|---|---|---|
| committer | gVisor bot <gvisor-bot@google.com> | 2020-04-10 15:47:23 -0700 |
| commit | 96f914295920404e7c5c97553771e09b31f6900a (patch) | |
| tree | 02738d88b3be86d6ab8acbdaa0811dbd182eef08 /pkg/sentry/fsimpl/gofer/gofer.go | |
| parent | ca868e3e384fb1dabec4fd27ff3627f61a3bd54d (diff) | |
Use O_CLOEXEC when dup'ing FDs
The sentry doesn't allow execve, but it's a good defense
in-depth measure.
PiperOrigin-RevId: 305958737
Diffstat (limited to 'pkg/sentry/fsimpl/gofer/gofer.go')
| -rw-r--r-- | pkg/sentry/fsimpl/gofer/gofer.go | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/pkg/sentry/fsimpl/gofer/gofer.go b/pkg/sentry/fsimpl/gofer/gofer.go index 20edaf643..bdf11fa65 100644 --- a/pkg/sentry/fsimpl/gofer/gofer.go +++ b/pkg/sentry/fsimpl/gofer/gofer.go @@ -1089,7 +1089,7 @@ func (d *dentry) ensureSharedHandle(ctx context.Context, read, write, trunc bool // 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.Dup3(int(h.fd), int(d.handle.fd), 0); err != nil { + if err := syscall.Dup3(int(h.fd), int(d.handle.fd), syscall.O_CLOEXEC); 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) |