sim: Add hw-rollback-protection feature
This commit adds simulator support to test the
hw-rollback-protection feature which is using
nv-counters. In the simulator they are stored in Rust
to prevent any race conditions from happening due to
the parallel execution of the tests.
Signed-off-by: Roland Mikhel <roland.mikhel@arm.com>
Change-Id: I445fc50615ed1f0c06e5933b16811c24d9d302fc
diff --git a/sim/mcuboot-sys/src/api.rs b/sim/mcuboot-sys/src/api.rs
index 624b3e9..db8564d 100644
--- a/sim/mcuboot-sys/src/api.rs
+++ b/sim/mcuboot-sys/src/api.rs
@@ -1,5 +1,6 @@
// Copyright (c) 2017-2021 Linaro LTD
// Copyright (c) 2018-2019 JUUL Labs
+// Copyright (c) 2023 Arm Limited
//
// SPDX-License-Identifier: Apache-2.0
@@ -131,10 +132,32 @@
pub base: usize,
}
+/// This struct stores the non-volatile security counter per image. It will be stored per test thread,
+/// and the C code will set / get the values here.
+#[repr(C)]
+#[derive(Debug, Default)]
+pub struct NvCounterStorage {
+ pub storage: Vec<u32>,
+}
+
+impl NvCounterStorage {
+ pub fn new() -> Self {
+ let count = if cfg!(feature = "multiimage") {
+ 2
+ } else {
+ 1
+ };
+ Self {
+ storage: vec![0; count]
+ }
+ }
+}
+
thread_local! {
pub static THREAD_CTX: RefCell<FlashContext> = RefCell::new(FlashContext::new());
pub static SIM_CTX: RefCell<CSimContextPtr> = RefCell::new(CSimContextPtr::new());
pub static RAM_CTX: RefCell<BootsimRamInfo> = RefCell::new(BootsimRamInfo::default());
+ pub static NV_COUNTER_CTX: RefCell<NvCounterStorage> = RefCell::new(NvCounterStorage::new());
}
/// Set the flash device to be used by the simulation. The pointer is unsafely stashed away.
@@ -317,3 +340,39 @@
0
}
}
+
+#[no_mangle]
+pub extern "C" fn sim_set_nv_counter_for_image(image_index: u32, security_counter_value: u32) -> libc::c_int {
+ let mut rc = 0;
+ NV_COUNTER_CTX.with(|ctx| {
+ let mut counter_storage = ctx.borrow_mut();
+ if image_index as usize >= counter_storage.storage.len() {
+ rc = -1;
+ return;
+ }
+ if counter_storage.storage[image_index as usize] > security_counter_value {
+ rc = -2;
+ warn!("Failed to set security counter value ({}) for image index {}", security_counter_value, image_index);
+ return;
+ }
+
+ counter_storage.storage[image_index as usize] = security_counter_value;
+ });
+
+ return rc;
+}
+
+#[no_mangle]
+pub extern "C" fn sim_get_nv_counter_for_image(image_index: u32, security_counter_value: *mut u32) -> libc::c_int {
+ let mut rc = 0;
+ NV_COUNTER_CTX.with(|ctx| {
+ let counter_storage = ctx.borrow();
+ if image_index as usize >= counter_storage.storage.len() {
+ rc = -1;
+ return;
+ }
+ unsafe { *security_counter_value = counter_storage.storage[image_index as usize] };
+
+ });
+ return rc;
+}