linux-kernel - Re: [PATCH bpf-next v2 3/3] bpf: Update LSM selftests for bpf_ima_inode

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Message-ID: <05776c185bdc61a8d210107e5937c31e2e47b936.camel@linux.ibm.com>
Date:   Mon, 23 Nov 2020 08:24:35 -0500
From:   Mimi Zohar <zohar@...ux.ibm.com>
To:     KP Singh <kpsingh@...omium.org>, James Morris <jmorris@...ei.org>,
        linux-kernel@...r.kernel.org, bpf@...r.kernel.org,
        linux-security-module@...r.kernel.org
Cc:     Yonghong Song <yhs@...com>, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Florent Revest <revest@...omium.org>,
        Brendan Jackman <jackmanb@...omium.org>
Subject: Re: [PATCH bpf-next v2 3/3] bpf: Update LSM selftests for
 bpf_ima_inode_hash

On Sat, 2020-11-21 at 00:50 +0000, KP Singh wrote:
> From: KP Singh <kpsingh@...gle.com>
> 
> - Update the IMA policy before executing the test binary (this is not an
>   override of the policy, just an append that ensures that hashes are
>   calculated on executions).

Assuming the builtin policy has been replaced with a custom policy and
CONFIG_IMA_WRITE_POLICY is enabled, then yes the rule is appended.   If
a custom policy has not yet been loaded, loading this rule becomes the
defacto custom policy.

Even if a custom policy has been loaded, potentially additional
measurements unrelated to this test would be included the measurement
list.  One way of limiting a rule to a specific test is by loopback
mounting a file system and defining a policy rule based on the loopback
mount unique uuid.

Mimi