diff --git a/library/std/src/sys/unsupported/common.rs b/library/std/src/sys/unsupported/common.rs
index 80311d26819ad..2cdd9c4d19e6e 100644
--- a/library/std/src/sys/unsupported/common.rs
+++ b/library/std/src/sys/unsupported/common.rs
@@ -39,10 +39,13 @@ pub fn hashmap_random_keys() -> (u64, u64) {
 pub enum Void {}
 
 pub unsafe fn strlen(mut s: *const c_char) -> usize {
-    let mut n = 0;
-    while *s != 0 {
-        n += 1;
-        s = s.offset(1);
+    // SAFETY: The caller must guarantee `s` points to a valid 0-terminated string.
+    unsafe {
+        let mut n = 0;
+        while *s != 0 {
+            n += 1;
+            s = s.offset(1);
+        }
+        n
     }
-    return n;
 }
diff --git a/library/std/src/sys/unsupported/mod.rs b/library/std/src/sys/unsupported/mod.rs
index 8ba870c5dbc14..d9efdec33d937 100644
--- a/library/std/src/sys/unsupported/mod.rs
+++ b/library/std/src/sys/unsupported/mod.rs
@@ -1,3 +1,5 @@
+#![deny(unsafe_op_in_unsafe_fn)]
+
 pub mod alloc;
 pub mod args;
 pub mod cmath;
diff --git a/library/std/src/sys/unsupported/mutex.rs b/library/std/src/sys/unsupported/mutex.rs
index 06ea9a1e2c109..7830faae601a0 100644
--- a/library/std/src/sys/unsupported/mutex.rs
+++ b/library/std/src/sys/unsupported/mutex.rs
@@ -1,7 +1,8 @@
-use crate::cell::UnsafeCell;
+use crate::cell::Cell;
 
 pub struct Mutex {
-    locked: UnsafeCell<bool>,
+    // This platform has no threads, so we can use a Cell here.
+    locked: Cell<bool>,
 }
 
 pub type MovableMutex = Mutex;
@@ -12,7 +13,7 @@ unsafe impl Sync for Mutex {} // no threads on this platform
 impl Mutex {
     #[rustc_const_stable(feature = "const_sys_mutex_new", since = "1.0.0")]
     pub const fn new() -> Mutex {
-        Mutex { locked: UnsafeCell::new(false) }
+        Mutex { locked: Cell::new(false) }
     }
 
     #[inline]
@@ -20,25 +21,17 @@ impl Mutex {
 
     #[inline]
     pub unsafe fn lock(&self) {
-        let locked = self.locked.get();
-        assert!(!*locked, "cannot recursively acquire mutex");
-        *locked = true;
+        assert_eq!(self.locked.replace(true), false, "cannot recursively acquire mutex");
     }
 
     #[inline]
     pub unsafe fn unlock(&self) {
-        *self.locked.get() = false;
+        self.locked.set(false);
     }
 
     #[inline]
     pub unsafe fn try_lock(&self) -> bool {
-        let locked = self.locked.get();
-        if *locked {
-            false
-        } else {
-            *locked = true;
-            true
-        }
+        self.locked.replace(true) == false
     }
 
     #[inline]
diff --git a/library/std/src/sys/unsupported/rwlock.rs b/library/std/src/sys/unsupported/rwlock.rs
index d37f34ac9352d..6982b2b155fa5 100644
--- a/library/std/src/sys/unsupported/rwlock.rs
+++ b/library/std/src/sys/unsupported/rwlock.rs
@@ -1,7 +1,8 @@
-use crate::cell::UnsafeCell;
+use crate::cell::Cell;
 
 pub struct RWLock {
-    mode: UnsafeCell<isize>,
+    // This platform has no threads, so we can use a Cell here.
+    mode: Cell<isize>,
 }
 
 unsafe impl Send for RWLock {}
@@ -9,14 +10,14 @@ unsafe impl Sync for RWLock {} // no threads on this platform
 
 impl RWLock {
     pub const fn new() -> RWLock {
-        RWLock { mode: UnsafeCell::new(0) }
+        RWLock { mode: Cell::new(0) }
     }
 
     #[inline]
     pub unsafe fn read(&self) {
-        let mode = self.mode.get();
-        if *mode >= 0 {
-            *mode += 1;
+        let m = self.mode.get();
+        if m >= 0 {
+            self.mode.set(m + 1);
         } else {
             rtabort!("rwlock locked for writing");
         }
@@ -24,9 +25,9 @@ impl RWLock {
 
     #[inline]
     pub unsafe fn try_read(&self) -> bool {
-        let mode = self.mode.get();
-        if *mode >= 0 {
-            *mode += 1;
+        let m = self.mode.get();
+        if m >= 0 {
+            self.mode.set(m + 1);
             true
         } else {
             false
@@ -35,19 +36,15 @@ impl RWLock {
 
     #[inline]
     pub unsafe fn write(&self) {
-        let mode = self.mode.get();
-        if *mode == 0 {
-            *mode = -1;
-        } else {
+        if self.mode.replace(-1) != 0 {
             rtabort!("rwlock locked for reading")
         }
     }
 
     #[inline]
     pub unsafe fn try_write(&self) -> bool {
-        let mode = self.mode.get();
-        if *mode == 0 {
-            *mode = -1;
+        if self.mode.get() == 0 {
+            self.mode.set(-1);
             true
         } else {
             false
@@ -56,12 +53,12 @@ impl RWLock {
 
     #[inline]
     pub unsafe fn read_unlock(&self) {
-        *self.mode.get() -= 1;
+        self.mode.set(self.mode.get() - 1);
     }
 
     #[inline]
     pub unsafe fn write_unlock(&self) {
-        *self.mode.get() += 1;
+        assert_eq!(self.mode.replace(0), -1);
     }
 
     #[inline]
diff --git a/library/std/src/sys/wasi/mod.rs b/library/std/src/sys/wasi/mod.rs
index a7a4407ac38e2..a0a37ef8316a8 100644
--- a/library/std/src/sys/wasi/mod.rs
+++ b/library/std/src/sys/wasi/mod.rs
@@ -53,6 +53,7 @@ pub mod thread_local_key;
 pub mod time;
 
 #[path = "../unsupported/common.rs"]
+#[deny(unsafe_op_in_unsafe_fn)]
 #[allow(unused)]
 mod common;
 pub use common::*;
diff --git a/library/std/src/sys/wasm/mod.rs b/library/std/src/sys/wasm/mod.rs
index 2934ea59ab5ff..18295e1129a05 100644
--- a/library/std/src/sys/wasm/mod.rs
+++ b/library/std/src/sys/wasm/mod.rs
@@ -66,5 +66,6 @@ cfg_if::cfg_if! {
 }
 
 #[path = "../unsupported/common.rs"]
+#[deny(unsafe_op_in_unsafe_fn)]
 mod common;
 pub use common::*;