Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.33 as permitted sender) client-ip=23.128.96.33;
Date:   Fri, 08 Dec 2023 16:40:09 +0000
To:     Alice Ryhl <aliceryhl@google.com>
From:   Benno Lossin <benno.lossin@proton.me>
Cc:     Miguel Ojeda <ojeda@kernel.org>,
        Alex Gaynor <alex.gaynor@gmail.com>,
        Wedson Almeida Filho <wedsonaf@gmail.com>,
        Boqun Feng <boqun.feng@gmail.com>, Gary Guo <gary@garyguo.net>,
        =?utf-8?Q?Bj=C3=B6rn_Roy_Baron?= <bjorn3_gh@protonmail.com>,
        Andreas Hindborg <a.hindborg@samsung.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Alexander Viro <viro@zeniv.linux.org.uk>,
        Christian Brauner <brauner@kernel.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        =?utf-8?Q?Arve_Hj=C3=B8nnev=C3=A5g?= <arve@android.com>,
        Todd Kjos <tkjos@android.com>,
        Martijn Coenen <maco@android.com>,
        Joel Fernandes <joel@joelfernandes.org>,
        Carlos Llamas <cmllamas@google.com>,
        Suren Baghdasaryan <surenb@google.com>,
        Dan Williams <dan.j.williams@intel.com>,
        Kees Cook <keescook@chromium.org>,
        Matthew Wilcox <willy@infradead.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Daniel Xu <dxu@dxuuu.xyz>, linux-kernel@vger.kernel.org,
        rust-for-linux@vger.kernel.org, linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH v2 5/7] rust: file: add `Kuid` wrapper
Message-ID: <jtCKrRw-FNajNJOXOuI1sweeDxI8T_uYnJ7DxMuqnJc9sgWjS0zouT_XIS-KmPferL7lU51BwD6nu73jZtzzB0T17pDeQP0-sFGRQxdjnaA=@proton.me>
In-Reply-To: <20231206-alice-file-v2-5-af617c0d9d94@google.com>
References: <20231206-alice-file-v2-0-af617c0d9d94@google.com> <20231206-alice-file-v2-5-af617c0d9d94@google.com>
Feedback-ID: 71780778:user:proton
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable
Precedence: bulk

On 12/6/23 12:59, Alice Ryhl wrote:
> +    /// Returns the given task's pid in the current pid namespace.
> +    pub fn pid_in_current_ns(&self) -> Pid {
> +        // SAFETY: Calling `task_active_pid_ns` with the current task is=
 always safe.
> +        let namespace =3D unsafe { bindings::task_active_pid_ns(bindings=
::get_current()) };

Why not create a safe wrapper for `bindings::get_current()`?
This patch series has three occurrences of `get_current`, so I think it
should be ok to add a wrapper.
I would also prefer to move the call to `bindings::get_current()` out of
the `unsafe` block.

> +        // SAFETY: We know that `self.0.get()` is valid by the type inva=
riant.

What about `namespace`?

--=20
Cheers,
Benno

> +        unsafe { bindings::task_tgid_nr_ns(self.0.get(), namespace) }
> +    }