linux-kernel - Re: leaking path in android binder: set

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Date:   Tue, 25 Sep 2018 19:38:10 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Tong Zhang <ztong@...edu>
Cc:     arve@...roid.com, tkjos@...roid.com, maco@...roid.com,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        Wenbo Shen <shenwenbosmile@...il.com>
Subject: Re: leaking path in android binder: set_nice

On Tue, Sep 25, 2018 at 01:27:11PM -0400, Tong Zhang wrote:
> 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.

Can you please submit a patch for this to get the proper credit for
finding and fixing this?

thanks,

greg k-h