** Tags removed: verification-needed-lunar ** Tags added: verification-done-lunar
-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/2007654 Title: enable Rust support in the kernel Status in linux package in Ubuntu: Fix Released Status in linux source package in Lunar: Fix Released Bug description: [Impact] Rust support has been merged starting with linux 6.1. This support allows to write external kernel modules using the Rust language. Modules written in this way are linked against the linux kernel and can be loaded/unloaded like any other .ko module. Main advantages of writing modules in Rust are: - memory safety: - no out of bounds accesses - no use after free - data race safety - strongly typed and statically typed - code extremely compact Roughly 70% of the security issues that the MSRC assigns a CVE to are memory safety issues: - Rust allows to write more secure and robust kernel code (reduce kernel CVEs) We should provide a Rust-enabled kernel so that people have the possibility to implement their own external kernel modules in Rust. [Test case] Build the following "hello world" test module: == hello_rust.rs == // SPDX-License-Identifier: GPL-2.0 //! Rust hello world example. use kernel::prelude::*; module! { type: HelloRust, name: "hello_rust", author: "Andrea Righi <andrea.ri...@canonical.com>", description: "Rust hello world example", license: "GPL", } struct HelloRust { } impl kernel::Module for HelloRust { fn init(_module: &'static ThisModule) -> Result<Self> { pr_info!("Hello from Rust\n"); Ok(HelloRust { }) } } impl Drop for HelloRust { fn drop(&mut self) { pr_info!("Goodbye from Rust\n"); } } == Makefile == NAME=hello_rust ifndef KERNELRELEASE ifndef KDIR KDIR:=/lib/modules/`uname -r`/build endif PWD := $(shell pwd) all: $(MAKE) -C $(KDIR) M=$(PWD) modules install: $(MAKE) -C $(KDIR) M=$(PWD) modules_install clean: rm -f *.o *.ko *.mod* .*.cmd *.d Module.symvers modules.order rm -rf .tmp_versions else obj-m := $(NAME).o endif [Fix] Building the Rust support in the kernel requires specific versions of the Rust compiler and bindgen utility, same to build the external modules in Rust): - rustc 1.62.0 - bindgen 0.56.0 - clang/llvm (already required by BPF) Archive should provide these versions (ideally with a version suffix to avoid conflicting with the stock versions, e.g., rustc-1.62 and bindgen-0.56). In addition to that the kernel needs some packaging adjustments to use these special toolchain binaries and some special (not yet upstream) patches that would allow to enable mandatory features required in our generic kernel, such as: UBUNTU: SAUCE: allows to enable Rust with modversions UBUNTU: SAUCE: modpost: support arbitrary symbol length in modversion UBUNTU: SAUCE: scripts: Exclude Rust CUs with pahole UBUNTU: SAUCE: rust: allow to use INIT_STACK_ALL_ZERO With all of the above we can enable CONFIG_RUST in the kernel and provide support to build external modules (.ko) using Rust. [Regression potential] We may see build regressions due to the inavailability of the proper toolchain versions. Moreover these toolchain dependencies need to be maintained, making sure to be always aligned with upstream requirements, when stable updates are applied to the kernel. Moreover, hwe kernels require special attention, since this feature won't be available in old releases (unless the proper toolchain requirements are met). To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2007654/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
