diff --git a/pvmfw/src/helpers.rs b/pvmfw/src/helpers.rs
index 1f0a764..933a6aa 100644
--- a/pvmfw/src/helpers.rs
+++ b/pvmfw/src/helpers.rs
@@ -15,6 +15,7 @@
 //! Miscellaneous helper functions.
 
 use core::arch::asm;
+use core::ops::Range;
 use zeroize::Zeroize;
 
 pub const SIZE_4KB: usize = 4 << 10;
@@ -163,6 +164,18 @@
     unsafe { core::slice::from_raw_parts(original.as_ptr().cast(), len) }
 }
 
+/// Trait to check containment of one range within another.
+pub(crate) trait RangeExt {
+    /// Returns true if `self` is contained within the `other` range.
+    fn is_within(&self, other: &Self) -> bool;
+}
+
+impl<T: PartialOrd> RangeExt for Range<T> {
+    fn is_within(&self, other: &Self) -> bool {
+        self.start >= other.start && self.end <= other.end
+    }
+}
+
 /// Create &CStr out of &str literal
 #[macro_export]
 macro_rules! cstr {