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AJvYcCWgknM58+OxHeUkp9Jxv4uaLFqEcL/3GnZCSvNSOKIwZEBsWjarWzUX6GonS1dDIbfesmDdGf9TjACL83wG4A==@vger.kernel.org X-Gm-Message-State: AOJu0YwfhCOBzwIRrd8liT6GuHPLwlc7FOp/SXqKTdZmWrsmXLsvxD+G YOMUYBwrbZnoKixwQfHxg7G9sMYhNT+Y52io2K+5kAWez1ropNbrcg7X7S3rQxcCz/aJDe/w/N3 LOUg+uXVaqXouzgZkkw== X-Received: from ejcxk12.prod.google.com ([2002:a17:907:d80c:b0:b8d:e244:8f2a]) (user=aliceryhl job=prod-delivery.src-stubby-dispatcher) by 2002:a17:907:720f:b0:b88:317a:3f40 with SMTP id a640c23a62f3a-b8dab33ae13mr542441666b.38.1769682952487; Thu, 29 Jan 2026 02:35:52 -0800 (PST) Date: Thu, 29 Jan 2026 10:35:51 +0000 In-Reply-To: <20260129084119.32994-4-jongan.kim@lge.com> Precedence: bulk X-Mailing-List: rust-for-linux@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260129084119.32994-1-jongan.kim@lge.com> <20260129084119.32994-4-jongan.kim@lge.com> Message-ID: Subject: Re: [PATCH v2 3/3] rust_binder: handle PID namespace conversion for freeze operation From: Alice Ryhl To: jongan.kim@lge.com Cc: arve@android.com, brauner@kernel.org, cmllamas@google.com, gregkh@linuxfoundation.org, tkjos@android.com, ojeda@kernel.org, boqun.feng@gmail.com, gary@garyguo.net, bjorn3_gh@protonmail.com, lossin@kernel.org, a.hindborg@kernel.org, tmgross@umich.edu, dakr@kernel.org, yury.norov@gmail.com, vitaly.wool@konsulko.se, tamird@gmail.com, viresh.kumar@linaro.org, daniel.almeida@collabora.com, linux-kernel@vger.kernel.org, rust-for-linux@vger.kernel.org, heesu0025.kim@lge.com, ht.hong@lge.com, jungsu.hwang@lge.com, kernel-team@android.com, sanghun.lee@lge.com, seulgi.lee@lge.com, sunghoon.kim@lge.com Content-Type: text/plain; charset="utf-8" On Thu, Jan 29, 2026 at 05:41:19PM +0900, jongan.kim@lge.com wrote: > From: HeeSu Kim > > Port PID namespace conversion logic from C binder to the Rust > implementation. > > Without namespace conversion, freeze operations from non-init namespaces > can match wrong processes due to PID collision. This adds proper > conversion to ensure freeze operations target the correct process. > > Signed-off-by: HeeSu Kim Overall looks good, thanks! > +/// Convert a PID from the current namespace to the global (init) namespace. > +fn convert_to_init_ns_tgid(pid: u32) -> Result { Let's use the typedef task::Pid (of bindings::pid_t) here, so you can avoid the `init_ns_pid as _` cast below. > + let current = kernel::current!(); > + let init_ns = init_pid_ns(); > + > + if current.active_pid_ns().map(|ns| ns.as_ptr()) == Some(init_ns.as_ptr()) { I'd like to avoid comparing raw pointers for this. Perhaps we should just provide an implementation of `==` for PidNamespace that compares the address? Alice