linux-kernel - [PATCH 5.15 021/179] binder: fix test regression due to sender

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Message-Id: <20211129181719.642329560@linuxfoundation.org>
Date:   Mon, 29 Nov 2021 19:16:55 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Christian Brauner <christian.brauner@...ntu.com>,
        Todd Kjos <tkjos@...gle.com>
Subject: [PATCH 5.15 021/179] binder: fix test regression due to sender_euid change

From: Todd Kjos <tkjos@...gle.com>

commit c21a80ca0684ec2910344d72556c816cb8940c01 upstream.

This is a partial revert of commit
29bc22ac5e5b ("binder: use euid from cred instead of using task").
Setting sender_euid using proc->cred caused some Android system test
regressions that need further investigation. It is a partial
reversion because subsequent patches rely on proc->cred.

Fixes: 29bc22ac5e5b ("binder: use euid from cred instead of using task")
Cc: stable@...r.kernel.org # 4.4+
Acked-by: Christian Brauner <christian.brauner@...ntu.com>
Signed-off-by: Todd Kjos <tkjos@...gle.com>
Change-Id: I9b1769a3510fed250bb21859ef8beebabe034c66
Link: https://lore.kernel.org/r/20211112180720.2858135-1-tkjos@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/android/binder.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -2710,7 +2710,7 @@ static void binder_transaction(struct bi
 		t->from = thread;
 	else
 		t->from = NULL;
-	t->sender_euid = proc->cred->euid;
+	t->sender_euid = task_euid(proc->tsk);
 	t->to_proc = target_proc;
 	t->to_thread = target_thread;
 	t->code = tr->code;