Merge tag 'rust-fixes-6.9' of https://github.com/Rust-for-Linux/linux

Pull Rust fixes from Miguel Ojeda:

 - Soundness: make internal functions generated by the 'module!' macro
   inaccessible, do not implement 'Zeroable' for 'Infallible' and
   require 'Send' for the 'Module' trait.

 - Build: avoid errors with "empty" files and workaround 'rustdoc' ICE.

 - Kconfig: depend on '!CFI_CLANG' and avoid selecting 'CONSTRUCTORS'.

 - Code docs: remove non-existing key from 'module!' macro example.

 - Docs: trivial rendering fix in arch table.

* tag 'rust-fixes-6.9' of https://github.com/Rust-for-Linux/linux:
  rust: remove `params` from `module` macro example
  kbuild: rust: force `alloc` extern to allow "empty" Rust files
  kbuild: rust: remove unneeded `@rustc_cfg` to avoid ICE
  rust: kernel: require `Send` for `Module` implementations
  rust: phy: implement `Send` for `Registration`
  rust: make mutually exclusive with CFI_CLANG
  rust: macros: fix soundness issue in `module!` macro
  rust: init: remove impl Zeroable for Infallible
  docs: rust: fix improper rendering in Arch Support page
  rust: don't select CONSTRUCTORS

2 files changed, 115 insertions, 87 deletions

diff --git a/rust/macros/lib.rs b/rust/macros/lib.rs
index f489f3157383..520eae5fd792 100644
--- a/rust/macros/lib.rs
+++ b/rust/macros/lib.rs
@@ -35,18 +35,6 @@ use proc_macro::TokenStream;
 ///     author: "Rust for Linux Contributors",
 ///     description: "My very own kernel module!",
 ///     license: "GPL",
-///     params: {
-///        my_i32: i32 {
-///            default: 42,
-///            permissions: 0o000,
-///            description: "Example of i32",
-///        },
-///        writeable_i32: i32 {
-///            default: 42,
-///            permissions: 0o644,
-///            description: "Example of i32",
-///        },
-///    },
 /// }
 ///
 /// struct MyModule;
diff --git a/rust/macros/module.rs b/rust/macros/module.rs
index 27979e582e4b..acd0393b5095 100644
--- a/rust/macros/module.rs
+++ b/rust/macros/module.rs
@@ -199,17 +199,6 @@ pub(crate) fn module(ts: TokenStream) -> TokenStream {
             /// Used by the printing macros, e.g. [`info!`].
             const __LOG_PREFIX: &[u8] = b\"{name}\\0\";
 
-            /// The \"Rust loadable module\" mark.
-            //
-            // This may be best done another way later on, e.g. as a new modinfo
-            // key or a new section. For the moment, keep it simple.
-            #[cfg(MODULE)]
-            #[doc(hidden)]
-            #[used]
-            static __IS_RUST_MODULE: () = ();
-
-            static mut __MOD: Option<{type_}> = None;
-
             // SAFETY: `__this_module` is constructed by the kernel at load time and will not be
             // freed until the module is unloaded.
             #[cfg(MODULE)]
@@ -221,81 +210,132 @@ pub(crate) fn module(ts: TokenStream) -> TokenStream {
                 kernel::ThisModule::from_ptr(core::ptr::null_mut())
             }};
 
-            // Loadable modules need to export the `{{init,cleanup}}_module` identifiers.
-            /// # Safety
-            ///
-            /// This function must not be called after module initialization, because it may be
-            /// freed after that completes.
-            #[cfg(MODULE)]
-            #[doc(hidden)]
-            #[no_mangle]
-            #[link_section = \".init.text\"]
-            pub unsafe extern \"C\" fn init_module() -> core::ffi::c_int {{
-                __init()
-            }}
-
-            #[cfg(MODULE)]
-            #[doc(hidden)]
-            #[no_mangle]
-            pub extern \"C\" fn cleanup_module() {{
-                __exit()
-            }}
+            // Double nested modules, since then nobody can access the public items inside.
+            mod __module_init {{
+                mod __module_init {{
+                    use super::super::{type_};
+
+                    /// The \"Rust loadable module\" mark.
+                    //
+                    // This may be best done another way later on, e.g. as a new modinfo
+                    // key or a new section. For the moment, keep it simple.
+                    #[cfg(MODULE)]
+                    #[doc(hidden)]
+                    #[used]
+                    static __IS_RUST_MODULE: () = ();
+
+                    static mut __MOD: Option<{type_}> = None;
+
+                    // Loadable modules need to export the `{{init,cleanup}}_module` identifiers.
+                    /// # Safety
+                    ///
+                    /// This function must not be called after module initialization, because it may be
+                    /// freed after that completes.
+                    #[cfg(MODULE)]
+                    #[doc(hidden)]
+                    #[no_mangle]
+                    #[link_section = \".init.text\"]
+                    pub unsafe extern \"C\" fn init_module() -> core::ffi::c_int {{
+                        // SAFETY: This function is inaccessible to the outside due to the double
+                        // module wrapping it. It is called exactly once by the C side via its
+                        // unique name.
+                        unsafe {{ __init() }}
+                    }}
 
-            // Built-in modules are initialized through an initcall pointer
-            // and the identifiers need to be unique.
-            #[cfg(not(MODULE))]
-            #[cfg(not(CONFIG_HAVE_ARCH_PREL32_RELOCATIONS))]
-            #[doc(hidden)]
-            #[link_section = \"{initcall_section}\"]
-            #[used]
-            pub static __{name}_initcall: extern \"C\" fn() -> core::ffi::c_int = __{name}_init;
+                    #[cfg(MODULE)]
+                    #[doc(hidden)]
+                    #[no_mangle]
+                    pub extern \"C\" fn cleanup_module() {{
+                        // SAFETY:
+                        // - This function is inaccessible to the outside due to the double
+                        //   module wrapping it. It is called exactly once by the C side via its
+                        //   unique name,
+                        // - furthermore it is only called after `init_module` has returned `0`
+                        //   (which delegates to `__init`).
+                        unsafe {{ __exit() }}
+                    }}
 
-            #[cfg(not(MODULE))]
-            #[cfg(CONFIG_HAVE_ARCH_PREL32_RELOCATIONS)]
-            core::arch::global_asm!(
-                r#\".section \"{initcall_section}\", \"a\"
-                __{name}_initcall:
-                    .long   __{name}_init - .
-                    .previous
-                \"#
-            );
+                    // Built-in modules are initialized through an initcall pointer
+                    // and the identifiers need to be unique.
+                    #[cfg(not(MODULE))]
+                    #[cfg(not(CONFIG_HAVE_ARCH_PREL32_RELOCATIONS))]
+                    #[doc(hidden)]
+                    #[link_section = \"{initcall_section}\"]
+                    #[used]
+                    pub static __{name}_initcall: extern \"C\" fn() -> core::ffi::c_int = __{name}_init;
+
+                    #[cfg(not(MODULE))]
+                    #[cfg(CONFIG_HAVE_ARCH_PREL32_RELOCATIONS)]
+                    core::arch::global_asm!(
+                        r#\".section \"{initcall_section}\", \"a\"
+                        __{name}_initcall:
+                            .long   __{name}_init - .
+                            .previous
+                        \"#
+                    );
+
+                    #[cfg(not(MODULE))]
+                    #[doc(hidden)]
+                    #[no_mangle]
+                    pub extern \"C\" fn __{name}_init() -> core::ffi::c_int {{
+                        // SAFETY: This function is inaccessible to the outside due to the double
+                        // module wrapping it. It is called exactly once by the C side via its
+                        // placement above in the initcall section.
+                        unsafe {{ __init() }}
+                    }}
 
-            #[cfg(not(MODULE))]
-            #[doc(hidden)]
-            #[no_mangle]
-            pub extern \"C\" fn __{name}_init() -> core::ffi::c_int {{
-                __init()
-            }}
+                    #[cfg(not(MODULE))]
+                    #[doc(hidden)]
+                    #[no_mangle]
+                    pub extern \"C\" fn __{name}_exit() {{
+                        // SAFETY:
+                        // - This function is inaccessible to the outside due to the double
+                        //   module wrapping it. It is called exactly once by the C side via its
+                        //   unique name,
+                        // - furthermore it is only called after `__{name}_init` has returned `0`
+                        //   (which delegates to `__init`).
+                        unsafe {{ __exit() }}
+                    }}
 
-            #[cfg(not(MODULE))]
-            #[doc(hidden)]
-            #[no_mangle]
-            pub extern \"C\" fn __{name}_exit() {{
-                __exit()
-            }}
+                    /// # Safety
+                    ///
+                    /// This function must only be called once.
+                    unsafe fn __init() -> core::ffi::c_int {{
+                        match <{type_} as kernel::Module>::init(&super::super::THIS_MODULE) {{
+                            Ok(m) => {{
+                                // SAFETY: No data race, since `__MOD` can only be accessed by this
+                                // module and there only `__init` and `__exit` access it. These
+                                // functions are only called once and `__exit` cannot be called
+                                // before or during `__init`.
+                                unsafe {{
+                                    __MOD = Some(m);
+                                }}
+                                return 0;
+                            }}
+                            Err(e) => {{
+                                return e.to_errno();
+                            }}
+                        }}
+                    }}
 
-            fn __init() -> core::ffi::c_int {{
-                match <{type_} as kernel::Module>::init(&THIS_MODULE) {{
-                    Ok(m) => {{
+                    /// # Safety
+                    ///
+                    /// This function must
+                    /// - only be called once,
+                    /// - be called after `__init` has been called and returned `0`.
+                    unsafe fn __exit() {{
+                        // SAFETY: No data race, since `__MOD` can only be accessed by this module
+                        // and there only `__init` and `__exit` access it. These functions are only
+                        // called once and `__init` was already called.
                         unsafe {{
-                            __MOD = Some(m);
+                            // Invokes `drop()` on `__MOD`, which should be used for cleanup.
+                            __MOD = None;
                         }}
-                        return 0;
-                    }}
-                    Err(e) => {{
-                        return e.to_errno();
                     }}
-                }}
-            }}
 
-            fn __exit() {{
-                unsafe {{
-                    // Invokes `drop()` on `__MOD`, which should be used for cleanup.
-                    __MOD = None;
+                    {modinfo}
                 }}
             }}
-
-            {modinfo}
         ",
         type_ = info.type_,
         name = info.name,