[PATCH v5 2/2] cred: delete task_euid()

[Paul Moore]

On Jul  3, 2026 Alice Ryhl <aliceryhl at google.com> wrote:
> 
> task_euid() is a very weird operation. You can see how weird it is by
> grepping for task_euid() - binder is its only user. task_euid() obtains
> the objective effective UID - it looks at the credentials of the task
> for purposes of acting on it as an object, but then accesses the
> effective UID (which the credentials.7 man page describes as "[...] used
> by the kernel to determine the permissions that the process will have
> when accessing shared resources [...]").
> 
> Since usage in Binder has now been removed, get rid of the resulting
> dead code.
> 
> Changes to the zh_CN translation was carried out with the help of
> Gemini and Google Translate, and since adjusted as per Alex Shi's
> feedback.
> 
> Suggested-by: Jann Horn <jannh at google.com>
> Reviewed-by: Gary Guo <gary at garyguo.net>
> Signed-off-by: Alice Ryhl <aliceryhl at google.com>
> ---
>  Documentation/security/credentials.rst                    |  6 ++----
>  Documentation/translations/zh_CN/security/credentials.rst |  4 +---
>  include/linux/cred.h                                      |  1 -
>  rust/helpers/task.c                                       |  5 -----
>  rust/kernel/task.rs                                       | 10 ----------
>  5 files changed, 3 insertions(+), 23 deletions(-)

Merged into lsm/dev, thanks!

--
paul-moore.com