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Clarify which accessor functions operate on > which set of credentials. > > Also document that Task::euid() is a very weird operation. You can see ho= w > 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 th= en > 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 [...]"). > > For context: > Arguably, binder's use of task_euid() is a theoretical security problem, > which only has no impact on Android because Android has no setuid binarie= s > executable by apps. If there's no setuid binary, then the `task_euid` can also just be replaced= with `task_uid`? > commit 29bc22ac5e5b ("binder: use euid from cred instead of using task") > fixed that by removing that only user of task_euid(), but the fix got > reverted in commit c21a80ca0684 ("binder: fix test regression due to > sender_euid change") because some Android test started failing. What exactly is relying on the current behaviour? It'll better to fix that = and remove `task_euid` completely as I find "objective effective UID" quite confusing, even with disclaimer that it shouldn't be used. Best, Gary > > Signed-off-by: Jann Horn > --- > rust/kernel/task.rs | 9 ++++++--- > 1 file changed, 6 insertions(+), 3 deletions(-) > > diff --git a/rust/kernel/task.rs b/rust/kernel/task.rs > index 49fad6de0674..33e6d44b9a15 100644 > --- a/rust/kernel/task.rs > +++ b/rust/kernel/task.rs > @@ -223,14 +223,17 @@ pub fn pid(&self) -> Pid { > unsafe { *ptr::addr_of!((*self.as_ptr()).pid) } > } > =20 > - /// Returns the UID of the given task. > + /// Returns the objective real UID of the given task. > #[inline] > pub fn uid(&self) -> Kuid { > // SAFETY: It's always safe to call `task_uid` on a valid task. > Kuid::from_raw(unsafe { bindings::task_uid(self.as_ptr()) }) > } > =20 > - /// Returns the effective UID of the given task. > + /// Returns the objective effective UID of the given task. > + /// > + /// You should probably not be using this; the effective UID is norm= ally > + /// only relevant in subjective credentials. > #[inline] > pub fn euid(&self) -> Kuid { > // SAFETY: It's always safe to call `task_euid` on a valid task. > @@ -363,7 +366,7 @@ unsafe fn dec_ref(obj: ptr::NonNull) { > } > =20 > impl Kuid { > - /// Get the current euid. > + /// Get the current subjective euid. > #[inline] > pub fn current_euid() -> Kuid { > // SAFETY: Just an FFI call. > > --- > base-commit: 192c0159402e6bfbe13de6f8379546943297783d > change-id: 20260212-rust-uid-f1b3a45c8084 > > -- =20 > Jann Horn