On Wed, Oct 6, 2021 at 12:46 PM Todd Kjos <tkjos@xxxxxxxxxx> wrote:
>
> Set a transaction's sender_euid from the the 'struct cred'
> saved at binder_open() instead of looking up the euid
> from the binder proc's 'struct task'. This ensures
> the euid is associated with the security context that
> of the task that opened binder.
>
> Fixes: 457b9a6f09f0 ("Staging: android: add binder driver")
> Signed-off-by: Todd Kjos <tkjos@xxxxxxxxxx>
> Stephen Smalley <stephen.smalley.work@xxxxxxxxx>
This should have been "Suggested-by: Stephen Smalley
<stephen.smalley.work@xxxxxxxxx>"
> Cc: stable@xxxxxxxxxxxxxxx # 4.4+
> ---
> v3: added this patch to series
>
> drivers/android/binder.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/android/binder.c b/drivers/android/binder.c
> index 989afd0804ca..26382e982c5e 100644
> --- a/drivers/android/binder.c
> +++ b/drivers/android/binder.c
> @@ -2711,7 +2711,7 @@ static void binder_transaction(struct binder_proc *proc,
> t->from = thread;
> else
> t->from = NULL;
> - t->sender_euid = task_euid(proc->tsk);
> + t->sender_euid = proc->cred->euid;
> t->to_proc = target_proc;
> t->to_thread = target_thread;
> t->code = tr->code;
> --
> 2.33.0.800.g4c38ced690-goog
>
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