linux-kernel - Leaking path for search_binary

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Message-Id: <C2D9C687-4964-4DB3-AAF4-7C836324D6BE@vt.edu>
Date:   Tue, 25 Sep 2018 13:27:03 -0400
From:   Tong Zhang <ztong@...edu>
To:     viro@...iv.linux.org.uk
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-security-module@...r.kernel.org, wenbo.s@...sung.com
Subject: Leaking path for search_binary_handler

Kernel Version: 4.18.5

Problem Description:

search_binary_handler() should be called after setting bprm using prepare_binprm(),
and in prepare_binprm(), there’s a LSM hook security_bprm_set_creds(), 
which can make a decision that binfmt cares.

We found a leaking path In fs/binfmt_misc.c:235, that don’t ask LSM’s decision.

- Tong