linux-kernel - leaking path in android binder: set

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Date:   Tue, 25 Sep 2018 13:27:11 -0400
From:   Tong Zhang <ztong@...edu>
To:     gregkh@...uxfoundation.org, arve@...roid.com, tkjos@...roid.com,
        maco@...roid.com
Cc:     devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        Wenbo Shen <shenwenbosmile@...il.com>
Subject: leaking path in android binder: set_nice

Kernel Version: 4.18.5

Problem Description:

When setting nice value, it is checked by LSM function security_task_setnice().
see kernel/sched/core.c:3972 SYSCALL_DEFINE1(nice, int, increment)

We discovered a leaking path in android binder which allows using binder’s interface to change 
a process’s nice value. This path is leaked from being monitored by LSM.
see drivers/android/binder.c:1107 binder_set_nice.

- Tong