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binder: use current_euid() for transaction sender identity

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Binder currently uses task_euid(proc->tsk) as the transaction sender EUID,
where proc->tsk is the main thread of the process that opened /dev/binder.
That's not clean; use the subjective EUID of the current task instead.

Signed-off-by: Jann Horn <jannh@google.com>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Acked-by: Gary Guo <gary@garyguo.net>
Link: https://patch.msgid.link/20260213-binder-uid-v1-1-7b795ae05523@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jann Horn
2026-02-26 21:35:18 -08:00
committed by Greg Kroah-Hartman
parent f3e0b76fc2
commit 65b6721522
1 changed files with 1 additions and 1 deletions
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drivers/android/binder.c
+1 -1
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@@ -3117,7 +3117,7 @@ static void binder_transaction(struct binder_proc *proc,
t->start_time = t_start_time;
t->from_pid = proc->pid;
t->from_tid = thread->pid;
t->sender_euid = task_euid(proc->tsk);
t->sender_euid = current_euid();
t->code = tr->code;
t->flags = tr->flags;
t->priority = task_nice(current);