linux-kernel - Re: [PATCH bpf-next v3 1/3] ima: Implement ima_inode

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Date:   Wed, 25 Nov 2020 07:27:53 -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:     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 v3 1/3] ima: Implement ima_inode_hash

On Tue, 2020-11-24 at 15:12 +0000, KP Singh wrote:
> From: KP Singh <kpsingh@...gle.com>
> 
> This is in preparation to add a helper for BPF LSM programs to use
> IMA hashes when attached to LSM hooks. There are LSM hooks like
> inode_unlink which do not have a struct file * argument and cannot
> use the existing ima_file_hash API.
> 
> An inode based API is, therefore, useful in LSM based detections like an
> executable trying to delete itself which rely on the inode_unlink LSM
> hook.
> 
> Moreover, the ima_file_hash function does nothing with the struct file
> pointer apart from calling file_inode on it and converting it to an
> inode.
> 
> Signed-off-by: KP Singh <kpsingh@...gle.com>


Acked-by: Mimi Zohar <zohar@...ux.ibm.com>