fix

Signed-off-by: Simon Davies <[email protected]>

Author: simongdavies

src/hyperlight_host/src/mem/mgr.rs

@@ -14,6 +14,8 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
+use std::cmp::Ordering;
+
 use flatbuffers::FlatBufferBuilder;
 use hyperlight_common::flatbuffer_wrappers::function_call::{
     FunctionCall, validate_guest_function_call_buffer,
@@ -309,7 +311,11 @@ impl SandboxMemoryManager<HostSharedMemory> {
     /// of why it isn't.
     #[instrument(err(Debug), skip_all, parent = Span::current(), level= "Trace")]
     pub(crate) fn check_stack_guard(&self) -> Result<bool> {
-        Ok(true)
+        let expected = self.stack_cookie;
+        let offset = self.layout.get_top_of_user_stack_offset();
+        let actual: [u8; STACK_COOKIE_LEN] = self.shared_mem.read(offset)?;
+        let cmp_res = expected.iter().cmp(actual.iter());
+        Ok(cmp_res == Ordering::Equal)
     }
 
     /// Get the address of the dispatch function in memory