Linux sandbox: whitelist allowed Futex operations.

sandbox/linux/seccomp-bpf-helpers/baseline_policy_unittest.cc

Index: sandbox/linux/seccomp-bpf-helpers/baseline_policy_unittest.cc
diff --git a/sandbox/linux/seccomp-bpf-helpers/baseline_policy_unittest.cc b/sandbox/linux/seccomp-bpf-helpers/baseline_policy_unittest.cc
index 3d92af01e52c8e588a5e44c91b7db091d96d98fe..f54882cd1fd7ba144f09c3a8943830da4cff4db0 100644
--- a/sandbox/linux/seccomp-bpf-helpers/baseline_policy_unittest.cc
+++ b/sandbox/linux/seccomp-bpf-helpers/baseline_policy_unittest.cc
@@ -271,6 +271,14 @@ BPF_DEATH_TEST_C(BaselinePolicy,
   syscall(__NR_futex, NULL, FUTEX_CMP_REQUEUE_PI_PRIVATE, 0, NULL, NULL, 0);
   _exit(1);
 }
+
+BPF_DEATH_TEST_C(BaselinePolicy,
+                 FutexWithUnlockPIPrivate,
+                 DEATH_MESSAGE(GetFutexErrorMessageContentForTests()),
+                 BaselinePolicy) {
+  syscall(__NR_futex, NULL, FUTEX_UNLOCK_PI_PRIVATE, 0, NULL, NULL, 0);
+  _exit(1);
+}
 #endif  // !defined(OS_ANDROID)
 
 BPF_TEST_C(BaselinePolicy, PrctlDumpable, BaselinePolicy) {