diff -up chromium-89.0.4389.82/sandbox/linux/seccomp-bpf-helpers/baseline_policy.cc.futex-time64 chromium-89.0.4389.82/sandbox/linux/seccomp-bpf-helpers/baseline_policy.cc
--- chromium-89.0.4389.82/sandbox/linux/seccomp-bpf-helpers/baseline_policy.cc.futex-time64	2021-03-15 15:31:09.440719811 -0400
+++ chromium-89.0.4389.82/sandbox/linux/seccomp-bpf-helpers/baseline_policy.cc	2021-03-15 15:33:27.494393985 -0400
@@ -191,7 +191,11 @@ ResultExpr EvaluateSyscallImpl(int fs_de
   }
 #endif
 
-  if (sysno == __NR_futex)
+  if (sysno == __NR_futex
+#if defined(__NR_futex_time64)
+      || sysno == __NR_futex_time64
+#endif
+  )
     return RestrictFutex();
 
   if (sysno == __NR_set_robust_list)
diff -up chromium-89.0.4389.82/sandbox/linux/seccomp-bpf-helpers/syscall_sets.cc.futex-time64 chromium-89.0.4389.82/sandbox/linux/seccomp-bpf-helpers/syscall_sets.cc
--- chromium-89.0.4389.82/sandbox/linux/seccomp-bpf-helpers/syscall_sets.cc.futex-time64	2021-03-15 15:33:45.018479568 -0400
+++ chromium-89.0.4389.82/sandbox/linux/seccomp-bpf-helpers/syscall_sets.cc	2021-03-15 15:34:55.002821350 -0400
@@ -420,6 +420,9 @@ bool SyscallSets::IsAllowedFutex(int sys
     case __NR_get_robust_list:
     case __NR_set_robust_list:
     case __NR_futex:
+#if defined(__NR_futex_time64)
+    case __NR_futex_time64:
+#endif
     default:
       return false;
   }