linux-kernel - [PATCH] rust: uaccess: mark UserSliceWriter method inline

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: <010001958d69ed91-0ccd9e4f-cd18-4451-a982-426b951d2e0c-000000@email.amazonses.com>
Date: Thu, 13 Mar 2025 02:51:24 +0000
From: Antonio Hickey <contact@...oniohickey.com>
To: Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>, 
	Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>, 
	Björn Roy Baron <bjorn3_gh@...tonmail.com>, 
	Benno Lossin <benno.lossin@...ton.me>, 
	Andreas Hindborg <a.hindborg@...nel.org>, 
	Alice Ryhl <aliceryhl@...gle.com>, Trevor Gross <tmgross@...ch.edu>, 
	Danilo Krummrich <dakr@...nel.org>, 
	Nathan Chancellor <nathan@...nel.org>, 
	Nick Desaulniers <nick.desaulniers+lkml@...il.com>, 
	Bill Wendling <morbo@...gle.com>, 
	Justin Stitt <justinstitt@...gle.com>
Cc: Antonio Hickey <contact@...oniohickey.com>, 
	rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org, 
	llvm@...ts.linux.dev
Subject: [PATCH] rust: uaccess: mark UserSliceWriter method inline

When you build the kernel using the llvm-19.1.4-rust-1.83.0-x86_64
toolchain provided by kernel.org with ARCH=x86_64, the following symbol
is generated:

$nm vmlinux | grep ' _R' | rustfilt | rg UserSliceWriter
ffffffff817c3390 T <kernel::uaccess::UserSliceWriter>::write_slice

However, this Rust symbol is a trivial wrapper around the function
copy_from_user. It doesn't make sense to go through a trivial wrapper
for this function, so mark it inline.

After applying this patch, the above command will produce no output.

Suggested-by: Alice Ryhl <aliceryhl@...gle.com>
Link: https://github.com/Rust-for-Linux/linux/issues/1145
Signed-off-by: Antonio Hickey <contact@...oniohickey.com>
---
 rust/kernel/uaccess.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/rust/kernel/uaccess.rs b/rust/kernel/uaccess.rs
index 719b0a48ff55..c33ff33d4da2 100644
--- a/rust/kernel/uaccess.rs
+++ b/rust/kernel/uaccess.rs
@@ -322,6 +322,7 @@ pub fn is_empty(&self) -> bool {
     /// Fails with [`EFAULT`] if the write happens on a bad address, or if the write goes out of
     /// bounds of this [`UserSliceWriter`]. This call may modify the associated userspace slice even
     /// if it returns an error.
+    #[inline]
     pub fn write_slice(&mut self, data: &[u8]) -> Result {
         let len = data.len();
         let data_ptr = data.as_ptr().cast::<c_void>();
-- 
2.48.1