linux-kernel - [PATCH v2 0/5] rust: Add bug/warn abstractions

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <20241218062009.2402650-1-fujita.tomonori@gmail.com>
Date: Wed, 18 Dec 2024 15:20:04 +0900
From: FUJITA Tomonori <fujita.tomonori@...il.com>
To: linux-kernel@...r.kernel.org,
	rust-for-linux@...r.kernel.org
Cc: x86@...nel.org,
	linux-riscv@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org,
	loongarch@...ts.linux.dev,
	tglx@...utronix.de,
	mingo@...hat.com,
	bp@...en8.de,
	dave.hansen@...ux.intel.com,
	peterz@...radead.org,
	hpa@...or.com,
	paul.walmsley@...ive.com,
	palmer@...belt.com,
	aou@...s.berkeley.edu,
	catalin.marinas@....com,
	will@...nel.org,
	chenhuacai@...nel.org,
	kernel@...0n.name,
	tangyouling@...ngson.cn,
	hejinyang@...ngson.cn,
	yangtiezhu@...ngson.cn,
	ojeda@...nel.org,
	alex.gaynor@...il.com,
	boqun.feng@...il.com,
	gary@...yguo.net,
	bjorn3_gh@...tonmail.com,
	benno.lossin@...ton.me,
	a.hindborg@...nel.org,
	aliceryhl@...gle.com,
	tmgross@...ch.edu
Subject: [PATCH v2 0/5] rust: Add bug/warn abstractions

This patchset adds warn_on and warn_on_once macros with the bug/warn
abstraction.

Wrapping C's BUG/WARN macros does not work the same way on
architectures that support Rust (x86, RISC-V, ARM64, LoongArch). Rust
code needs to directly execute the same assembly code used on the C
side. To avoid duplicating the assembly code, this approach mirrors
what the static branch code does: it dynamically generates the
assembly code for Rust using the C preprocessor.

The 1st to 4th patches export the BUG/WARN assembly code for Rust on
each architecture, with no functional changes on the C side. The
changes for x86 and RISC-V are straightforward. However, the ARM64 and
LoongArch assembly code are designed differently; they are used by
both C inline assembly and assembly code. As a result, sharing this
code with Rust is complicated.

The last patch adds the bug abstraction with warn_on and warn_on_once
implementations.

This has been tested on x86, ARM64, and RISC-V (QEMU), with only a
compile test performed for LoongArch.

The assembly code can be used for both BUG and WARN, but currently
only supports warn_on and warn_on_once. I will work on the remaining
functionality after this abstraction is merged.

v2:
- remove target_arch cfg by using asm comment
- clean up the changes to loongarch asm
v1: https://lore.kernel.org/linux-arm-kernel/20241210001802.228725-1-fujita.tomonori@gmail.com/

FUJITA Tomonori (5):
  x86/bug: Add ARCH_WARN_ASM macro for BUG/WARN asm code sharing with
    Rust
  riscv/bug: Add ARCH_WARN_ASM macro for BUG/WARN asm code sharing with
    Rust
  arm64/bug: Add ARCH_WARN_ASM macro for BUG/WARN asm code sharing with
    Rust
  loongarch/bug: Add ARCH_WARN_ASM macro for BUG/WARN asm code sharing
    with Rust
  rust: Add warn_on and warn_on_once

 arch/arm64/include/asm/asm-bug.h              |  31 +++++-
 arch/loongarch/include/asm/bug.h              |  31 +++++-
 arch/riscv/include/asm/bug.h                  |  35 +++---
 arch/x86/include/asm/bug.h                    |  51 +++++----
 rust/Makefile                                 |   8 ++
 rust/kernel/.gitignore                        |   2 +
 rust/kernel/bug.rs                            | 100 ++++++++++++++++++
 rust/kernel/generated_arch_reachable_asm.rs.S |   7 ++
 rust/kernel/generated_arch_warn_asm.rs.S      |   7 ++
 rust/kernel/lib.rs                            |   1 +
 10 files changed, 224 insertions(+), 49 deletions(-)
 create mode 100644 rust/kernel/bug.rs
 create mode 100644 rust/kernel/generated_arch_reachable_asm.rs.S
 create mode 100644 rust/kernel/generated_arch_warn_asm.rs.S

base-commit: 517743c4e303252cd8c1a1fb1bed28e7d94d4678
-- 
2.43.0