linux-kernel - Re: [PATCH v5 0/2] strncpy_from

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Message-ID: <CANiq72kG1TarXDJPbRnWJhBkUVdO+EOPEk70rAyDK6svt7TxNA@mail.gmail.com>
Date: Mon, 14 Jul 2025 01:37:01 +0200
From: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To: Alice Ryhl <aliceryhl@...gle.com>
Cc: Miguel Ojeda <ojeda@...nel.org>, Andrew Morton <akpm@...ux-foundation.org>, 
	Alexander Viro <viro@...iv.linux.org.uk>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
	Boqun Feng <boqun.feng@...il.com>, Benno Lossin <lossin@...nel.org>, 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>, rust-for-linux@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 0/2] strncpy_from_user for Rust

On Mon, Jun 16, 2025 at 2:42 PM Alice Ryhl <aliceryhl@...gle.com> wrote:
>
> There is currently no easy way to read NUL-terminated strings from
> userspace. Trying to use the ordinary read function on an array of the
> maximum length doesn't work because it could fail with EFAULT when the C
> string is shorter than the maximum length. In this case,
> strncpy_from_user is better because it doesn't return EFAULT even if it
> encounters a page fault on bytes that are after the NUL-terminator but
> before the maximum length.
>
> I don't see a clear owner of uaccess in MAINTAINERS, so I suggest that
> it lands through Miguel's tree.
>
> Signed-off-by: Alice Ryhl <aliceryhl@...gle.com>

Applied to `rust-next` -- thanks everyone!

    [ Reworded title. - Miguel ]

    [ Use `from_mut` to clean `clippy::ref_as_ptr` lint. Reworded
      title. - Miguel ]

Cheers,
Miguel