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-rw-r--r--pkg/sentry/syscalls/linux/sys_sem.go7
1 files changed, 4 insertions, 3 deletions
diff --git a/pkg/sentry/syscalls/linux/sys_sem.go b/pkg/sentry/syscalls/linux/sys_sem.go
index a1601676f..a62a6b3b5 100644
--- a/pkg/sentry/syscalls/linux/sys_sem.go
+++ b/pkg/sentry/syscalls/linux/sys_sem.go
@@ -150,9 +150,10 @@ func Semctl(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.Syscal
buf := args[3].Pointer()
r := t.IPCNamespace().SemaphoreRegistry()
info := r.IPCInfo()
- _, err := info.CopyOut(t, buf)
- // TODO(gvisor.dev/issue/137): Return the index of the highest used entry.
- return 0, nil, err
+ if _, err := info.CopyOut(t, buf); err != nil {
+ return 0, nil, err
+ }
+ return uintptr(r.HighestIndex()), nil, nil
case linux.SEM_INFO,
linux.SEM_STAT,