1 files changed, 21 insertions, 0 deletions
diff --git a/rust/kernel/alloc/kbox.rs b/rust/kernel/alloc/kbox.rs
index d811edbf9b3b..cb4ebea3b074 100644
--- a/rust/kernel/alloc/kbox.rs
+++ b/rust/kernel/alloc/kbox.rs
@@ -354,6 +354,7 @@ where
     A: Allocator,
 {
     type Borrowed<'a> = &'a T;
+    type BorrowedMut<'a> = &'a mut T;
 
     fn into_foreign(self) -> *mut crate::ffi::c_void {
         Box::into_raw(self).cast()
@@ -370,6 +371,13 @@ where
         // immutable for the duration of 'a.
         unsafe { &*ptr.cast() }
     }
+
+    unsafe fn borrow_mut<'a>(ptr: *mut crate::ffi::c_void) -> &'a mut T {
+        let ptr = ptr.cast();
+        // SAFETY: The safety requirements of this method ensure that the pointer is valid and that
+        // nothing else will access the value for the duration of 'a.
+        unsafe { &mut *ptr }
+    }
 }
 
 impl<T: 'static, A> ForeignOwnable for Pin<Box<T, A>>
@@ -377,6 +385,7 @@ where
     A: Allocator,
 {
     type Borrowed<'a> = Pin<&'a T>;
+    type BorrowedMut<'a> = Pin<&'a mut T>;
 
     fn into_foreign(self) -> *mut crate::ffi::c_void {
         // SAFETY: We are still treating the box as pinned.
@@ -399,6 +408,18 @@ where
         // SAFETY: This pointer originates from a `Pin<Box<T>>`.
         unsafe { Pin::new_unchecked(r) }
     }
+
+    unsafe fn borrow_mut<'a>(ptr: *mut crate::ffi::c_void) -> Pin<&'a mut T> {
+        let ptr = ptr.cast();
+        // SAFETY: The safety requirements for this function ensure that the object is still alive,
+        // so it is safe to dereference the raw pointer.
+        // The safety requirements of `from_foreign` also ensure that the object remains alive for
+        // the lifetime of the returned value.
+        let r = unsafe { &mut *ptr };
+
+        // SAFETY: This pointer originates from a `Pin<Box<T>>`.
+        unsafe { Pin::new_unchecked(r) }
+    }
 }
 
 impl<T, A> Deref for Box<T, A>