This bug was fixed in the package linux - 6.2.0-18.18
---------------
linux (6.2.0-18.18) lunar; urgency=medium
* lunar/linux: 6.2.0-18.18 -proposed tracker (LP: #2011750)
* lunar/linux 6.2 fails to boot on arm64 (LP: #2011748)
- SAUCE: Revert "efi: random: fix NULL-deref when refreshing seed"
- SAUCE: Revert "efi: random: refresh non-volatile random seed when RNG is
initialized"
-- Andrea Righi <andrea.ri...@canonical.com> Wed, 15 Mar 2023 23:54:18
+0100
** Changed in: linux (Ubuntu Lunar)
Status: Confirmed => Fix Released
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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).
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