| Message ID | 20220805154231.31257-14-ojeda@kernel.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Rust support | expand |
On Fri, Aug 05, 2022 at 05:41:58PM +0200, Miguel Ojeda wrote: > All symbols are reexported reusing the `EXPORT_SYMBOL_GPL` macro > from C. The lists of symbols are generated on the fly. > > There are three main sets of symbols to distinguish: > > - The ones from the `core` and `alloc` crates (from the Rust > standard library). The code is licensed as Apache/MIT. > > - The ones from our abstractions in the `kernel` crate. > > - The helpers (already exported since they are not generated). > > We export everything as GPL. This ensures we do not mistakenly > expose GPL kernel symbols/features as non-GPL, even indirectly. > > Co-developed-by: Alex Gaynor <alex.gaynor@gmail.com> > Signed-off-by: Alex Gaynor <alex.gaynor@gmail.com> Reviewed-by: Kees Cook <keescook@chromium.org>
diff --git a/rust/exports.c b/rust/exports.c new file mode 100644 index 000000000000..bb7cc64cecd0 --- /dev/null +++ b/rust/exports.c @@ -0,0 +1,21 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * A hack to export Rust symbols for loadable modules without having to redo + * the entire `include/linux/export.h` logic in Rust. + * + * This requires the Rust's new/future `v0` mangling scheme because the default + * one ("legacy") uses invalid characters for C identifiers (thus we cannot use + * the `EXPORT_SYMBOL_*` macros). + * + * All symbols are exported as GPL-only to guarantee no GPL-only feature is + * accidentally exposed. + */ + +#include <linux/module.h> + +#define EXPORT_SYMBOL_RUST_GPL(sym) extern int sym; EXPORT_SYMBOL_GPL(sym) + +#include "exports_core_generated.h" +#include "exports_alloc_generated.h" +#include "exports_bindings_generated.h" +#include "exports_kernel_generated.h"
All symbols are reexported reusing the `EXPORT_SYMBOL_GPL` macro from C. The lists of symbols are generated on the fly. There are three main sets of symbols to distinguish: - The ones from the `core` and `alloc` crates (from the Rust standard library). The code is licensed as Apache/MIT. - The ones from our abstractions in the `kernel` crate. - The helpers (already exported since they are not generated). We export everything as GPL. This ensures we do not mistakenly expose GPL kernel symbols/features as non-GPL, even indirectly. Co-developed-by: Alex Gaynor <alex.gaynor@gmail.com> Signed-off-by: Alex Gaynor <alex.gaynor@gmail.com> Co-developed-by: Wedson Almeida Filho <wedsonaf@google.com> Signed-off-by: Wedson Almeida Filho <wedsonaf@google.com> Co-developed-by: Björn Roy Baron <bjorn3_gh@protonmail.com> Signed-off-by: Björn Roy Baron <bjorn3_gh@protonmail.com> Signed-off-by: Miguel Ojeda <ojeda@kernel.org> --- rust/exports.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) create mode 100644 rust/exports.c