linux-kernel - Re: [RFC 0/3] WhiteEgret LSM module

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Message-ID: <e26e9aa2-12b2-4aac-092b-747e8be160a3@schaufler-ca.com>
Date:   Fri, 2 Jun 2017 12:00:22 -0700
From:   Casey Schaufler <casey@...aufler-ca.com>
To:     Steve Kemp <steve.backup.kemp@...glemail.com>
Cc:     linux-security-module <linux-security-module@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [RFC 0/3] WhiteEgret LSM module

On 6/2/2017 10:39 AM, Steve Kemp wrote:
>> Create an security module that looks for the attribute
> For what it is worth I thought this seemed like an interesting project
> for a beginner, so I did just that.  I wrote up the experience here:
>
> https://blog.steve.fi/so_i_accidentally_wrote_a_linux_security_module.html
>
> In short it was a very simple and clean approach, which I think is
> hard to get wrong.  The only part I need to work on some more is the
> difference between `user` and `security` attributes.

A 'user' attribute can be set by the file owner. A 'security'
attribute requires privilege. SELinux and Smack use 'security'
attributes to prevent users from mucking with them. You need
to create module hooks for manipulating them, including

	inode_init_security
	inode_setxattr
	inode_post_setxattr
	inode_removexattr
	inode_getsecurity
	inode_listsecurity
	inode_setsecurity
	d_instantiate



>
> Steve
> --
> https://steve.fi/
>