linux-kernel - Leaking path for set_task

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Date:   Tue, 25 Sep 2018 13:27:08 -0400
From:   Tong Zhang <ztong@...edu>
To:     adobriyan@...il.com, akpm@...ux-foundation.org,
        viro@...iv.linux.org.uk, gorcunov@...nvz.org
Cc:     linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-security-module@...r.kernel.org, wenbo.s@...sung.com
Subject: Leaking path for set_task_comm

Kernel Version: 4.18.5

Problem Description:

When using prctl(PR_SET_NAME) to set the thread name, it is checked by security_task_prctl.

We discovered a leaking path that can also use method implemented in 
fs/proc/base.c:1526 comm_write(), to do similar thing without asking LSM’s decision.

- Tong