1 files changed, 22 insertions, 0 deletions
diff --git a/mm/kasan/kasan_test_rust.rs b/mm/kasan/kasan_test_rust.rs
new file mode 100644
index 000000000000..5b34edf30e72
--- /dev/null
+++ b/mm/kasan/kasan_test_rust.rs
@@ -0,0 +1,22 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! Helper crate for KASAN testing.
+//!
+//! Provides behavior to check the sanitization of Rust code.
+
+use core::ptr::addr_of_mut;
+use kernel::prelude::*;
+
+/// Trivial UAF - allocate a big vector, grab a pointer partway through,
+/// drop the vector, and touch it.
+#[no_mangle]
+pub extern "C" fn kasan_test_rust_uaf() -> u8 {
+    let mut v: KVec<u8> = KVec::new();
+    for _ in 0..4096 {
+        v.push(0x42, GFP_KERNEL).unwrap();
+    }
+    let ptr: *mut u8 = addr_of_mut!(v[2048]);
+    drop(v);
+    // SAFETY: Incorrect, on purpose.
+    unsafe { *ptr }
+}