diff --git a/libc/SECCOMP_ALLOWLIST_COMMON.TXT b/libc/SECCOMP_ALLOWLIST_COMMON.TXT
index efbf28b..4a8d501 100644
--- a/libc/SECCOMP_ALLOWLIST_COMMON.TXT
+++ b/libc/SECCOMP_ALLOWLIST_COMMON.TXT
@@ -53,6 +53,7 @@
 int execveat(int, const char*, char* const*, char* const*, int)  all
 # Since Linux 4.3, not in glibc. Probed for and conditionally used by ART.
 int membarrier(int, int) all
+int userfaultfd(int) all
 # Since Linux 5.1, not in glibc. Not used by bionic, and not likely ever
 # to be (because the last thing anyone needs is a new 32-bit ABI in the
 # 2020s!) but http://b/138781460 showed cuttlefish needed at least the
@@ -73,5 +74,5 @@
 int rt_sigtimedwait_time64(const sigset64_t*, siginfo_t*, const timespec64*, size_t) lp32
 int futex_time64(int*, int, int, const timespec64*, int*, int) lp32
 int sched_rr_get_interval_time64(pid_t, timespec64*) lp32
-# Since Linux 5.4, not in glibc. Probed for and conditionally used by ART.
-int userfaultfd(int) all
+# Since Linux 6.4, not in glibc (https://www.openwall.com/lists/libc-coord/2023/07/13/1).
+int riscv_hwprobe(riscv_hwprobe*, size_t, size_t, unsigned long*, unsigned) riscv64