Disallow references to static mut

Cargo.toml

@@ -37,3 +37,10 @@ icon = "crab_32x32.gif"
 
 [package.metadata.ledger.flex]
 icon = "crab_40x40.gif"
+
+[patch.crates-io]
+ledger_device_sdk = { path = "../ledger-device-rust-sdk/ledger_device_sdk" }
+include_gif = { path = "../ledger-device-rust-sdk/include_gif" }
+
+[lints.rust]
+unexpected_cfgs = { level = "warn", check-cfg = ['cfg(target_os, values("stax", "flex", "nanos", "nanox", "nanosplus"))'] }

src/settings.rs

@@ -20,26 +20,30 @@ impl Settings {
     #[inline(never)]
     #[allow(unused)]
     pub fn get_mut(&mut self) -> &mut AtomicStorage<[u8; SETTINGS_SIZE]> {
-        return unsafe { DATA.get_mut() };
+        let data = &raw mut DATA;
+        return unsafe { (*data).get_mut() };
     }
 
     #[inline(never)]
     #[allow(unused)]
     pub fn get_ref(&mut self) -> &AtomicStorage<[u8; SETTINGS_SIZE]> {
-        return unsafe { DATA.get_ref() };
+        let data = &raw const DATA;
+        return unsafe { (*data).get_ref() };
     }
 
     #[allow(unused)]
     pub fn get_element(&self, index: usize) -> u8 {
-        let storage = unsafe { DATA.get_ref() };
+        let data = &raw const DATA;
+        let storage = unsafe { (*data).get_ref() };
         let settings = storage.get_ref();
         settings[index]
     }
 
     #[allow(unused)]
     // Not used in this boilerplate, but can be used to set a value in the settings
     pub fn set_element(&self, index: usize, value: u8) {
-        let storage = unsafe { DATA.get_mut() };
+        let data = &raw mut DATA;
+        let storage = unsafe { (*data).get_mut() };
         let mut updated_data = *storage.get_ref();
         updated_data[index] = value;
         unsafe {