Report unsoundness of xous (#2179)

crates/xous/RUSTSEC-0000-0000.md

@@ -0,0 +1,23 @@
+```toml
+[advisory]
+id = "RUSTSEC-0000-0000"
+package = "xous"
+date = "2024-12-23"
+url = "https://github.com/betrusted-io/xous-core/issues/410"
+references = ["https://github.com/betrusted-io/xous-core/pull/411"]
+categories = []
+keywords = []
+informational = "unsound"
+
+[versions]
+patched = [">= 0.9.51"]
+
+[affected]
+functions = {"xous::definitions::MemoryRange::as_slice" = ["< 0.9.51"], "xous::definitions::MemoryRange::as_slice_mut" = ["< 0.9.51"]}
+```
+
+# Unsound usages of `core::slice::from_raw_parts` 
+
+We consider `as_slice` and `as_slice_mut` unsound because: the pointer with any bit patterns could be cast to the slice of arbitrary types. The pointer could be created by unsafe new and deprecated `from_parts`. We consider that `from_parts` should be removed in latest version because it will help trigger unsoundness in `as_slice`. With new declared as unsafe, `as_slice` should also declared as unsafe.  
+
+This was patched in by marking two functions as `unsafe`.