linux-kernel - Re: [RFC v3 7/8] binder: use __kernel_pid_t and __kernel_uid

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Message-ID: <CAHRSSEy5_h9LJB4q5_OJA7fSq=ROo68UaK+hdPz-Vj-wac1Qhg@mail.gmail.com>
Date:   Thu, 10 Mar 2022 11:33:20 -0800
From:   Todd Kjos <tkjos@...gle.com>
To:     "T.J. Mercier" <tjmercier@...gle.com>
Cc:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Jonathan Corbet <corbet@....net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Arve Hjønnevåg <arve@...roid.com>,
        Todd Kjos <tkjos@...roid.com>,
        Martijn Coenen <maco@...roid.com>,
        Joel Fernandes <joel@...lfernandes.org>,
        Christian Brauner <brauner@...nel.org>,
        Hridya Valsaraju <hridya@...gle.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Christian König <christian.koenig@....com>,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        Liam Mark <lmark@...eaurora.org>,
        Laura Abbott <labbott@...hat.com>,
        Brian Starkey <Brian.Starkey@....com>,
        John Stultz <john.stultz@...aro.org>,
        Tejun Heo <tj@...nel.org>, Zefan Li <lizefan.x@...edance.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Shuah Khan <shuah@...nel.org>, kaleshsingh@...gle.com,
        Kenny.Ho@....com, dri-devel@...ts.freedesktop.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-media@...r.kernel.org, linaro-mm-sig@...ts.linaro.org,
        cgroups@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: Re: [RFC v3 7/8] binder: use __kernel_pid_t and __kernel_uid_t for userspace

On Wed, Mar 9, 2022 at 8:52 AM T.J. Mercier <tjmercier@...gle.com> wrote:
>
> The kernel interface should use types that the kernel defines instead of
> pid_t and uid_t, whose definiton is owned by libc. This fixes the header
> so that it can be included without first including sys/types.h.
>
> Signed-off-by: T.J. Mercier <tjmercier@...gle.com>
> ---
>  include/uapi/linux/android/binder.h | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/include/uapi/linux/android/binder.h b/include/uapi/linux/android/binder.h
> index 169fd5069a1a..aa28454dbca3 100644
> --- a/include/uapi/linux/android/binder.h
> +++ b/include/uapi/linux/android/binder.h
> @@ -289,8 +289,8 @@ struct binder_transaction_data {
>
>         /* General information about the transaction. */
>         __u32           flags;
> -       pid_t           sender_pid;
> -       uid_t           sender_euid;
> +       __kernel_pid_t  sender_pid;
> +       __kernel_uid_t  sender_euid;

Are we guaranteed that this does not affect the UAPI at all? Userspace
code using this definition will have to run with kernels using the old
definition and visa-versa.

>         binder_size_t   data_size;      /* number of bytes of data */
>         binder_size_t   offsets_size;   /* number of bytes of offsets */
>
> --
> 2.35.1.616.g0bdcbb4464-goog
>