linux-kernel - [PATCH v4 0/4] Rust support for `struct iov

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: <20250813-iov-iter-v4-0-c4f1932b05ef@google.com>
Date: Wed, 13 Aug 2025 08:27:16 +0000
From: Alice Ryhl <aliceryhl@...gle.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Alexander Viro <viro@...iv.linux.org.uk>, 
	Arnd Bergmann <arnd@...db.de>, Miguel Ojeda <ojeda@...nel.org>
Cc: Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>, 
	"Björn Roy Baron" <bjorn3_gh@...tonmail.com>, Andreas Hindborg <a.hindborg@...nel.org>, 
	Trevor Gross <tmgross@...ch.edu>, Danilo Krummrich <dakr@...nel.org>, Matthew Maurer <mmaurer@...gle.com>, 
	Lee Jones <lee@...nel.org>, linux-kernel@...r.kernel.org, 
	rust-for-linux@...r.kernel.org, Alice Ryhl <aliceryhl@...gle.com>, 
	Benno Lossin <lossin@...nel.org>, Christian Brauner <brauner@...nel.org>
Subject: [PATCH v4 0/4] Rust support for `struct iov_iter`

This series adds support for the `struct iov_iter` type. This type
represents an IO buffer for reading or writing, and can be configured
for either direction of communication.

In Rust, we define separate types for reading and writing. This will
ensure that you cannot mix them up and e.g. call copy_from_iter in a
read_iter syscall.

To use the new abstractions, miscdevices are given new methods read_iter
and write_iter that can be used to implement the read/write syscalls on
a miscdevice. The miscdevice sample is updated to provide read/write
operations.

Intended for Greg's miscdevice tree.

Signed-off-by: Alice Ryhl <aliceryhl@...gle.com>
---
Changes in v4:
- Rebase on v6.17-rc1. No longer any dependencies.
- Adjust wording of `revert` safety comment.
- Adjust "deinitialize" wording to "write uninitialized".
- Adjust several comments' wording in `rust/kernel/fs/kiocb.rs`.
- Link to v3: https://lore.kernel.org/r/20250722-iov-iter-v3-0-3efc9c2c2893@google.com

Changes in v3:
- Rebase on rust-next.
- Use ptr::from_mut to silence warning.
- Move Kiocb to rust::fs.
- Rename Kiocb::device() to Kiocb::file() as it's no longer miscdevice
  specific.
- Significant rewording of docs and safety comments, especially patch 1
  and 2.
- Link to v2: https://lore.kernel.org/r/20250704-iov-iter-v2-0-e69aa7c1f40e@google.com

Changes in v2:
- Remove Send/Sync/Copy impls.
- Reword docs significantly.
- Rename Kiocb::private_data() to Kiocb::device().
- Rebase on v6.16-rc2.
- Link to v1: https://lore.kernel.org/r/20250311-iov-iter-v1-0-f6c9134ea824@google.com

---
Alice Ryhl (3):
      rust: iov: add iov_iter abstractions for ITER_SOURCE
      rust: iov: add iov_iter abstractions for ITER_DEST
      rust: miscdevice: Provide additional abstractions for iov_iter and kiocb structures

Lee Jones (1):
      samples: rust_misc_device: Expand the sample to support read()ing from userspace

 rust/kernel/fs.rs                |   3 +
 rust/kernel/fs/kiocb.rs          |  68 +++++++++
 rust/kernel/iov.rs               | 311 +++++++++++++++++++++++++++++++++++++++
 rust/kernel/lib.rs               |   1 +
 rust/kernel/miscdevice.rs        |  63 +++++++-
 samples/rust/rust_misc_device.rs |  36 ++++-
 6 files changed, 479 insertions(+), 3 deletions(-)
---
base-commit: 062b3e4a1f880f104a8d4b90b767788786aa7b78
change-id: 20250311-iov-iter-c984aea07d18

Best regards,
-- 
Alice Ryhl <aliceryhl@...gle.com>