linux-kernel - Re: [PATCH v9 22/25] evm: Move to LSM infrastructure

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Date: Fri, 9 Feb 2024 10:48:10 +0100
From: Christian Brauner <brauner@...nel.org>
To: Roberto Sassu <roberto.sassu@...weicloud.com>
Cc: viro@...iv.linux.org.uk, chuck.lever@...cle.com, jlayton@...nel.org, 
	neilb@...e.de, kolga@...app.com, Dai.Ngo@...cle.com, tom@...pey.com, 
	paul@...l-moore.com, jmorris@...ei.org, serge@...lyn.com, zohar@...ux.ibm.com, 
	dmitry.kasatkin@...il.com, eric.snowberg@...cle.com, dhowells@...hat.com, jarkko@...nel.org, 
	stephen.smalley.work@...il.com, eparis@...isplace.org, casey@...aufler-ca.com, shuah@...nel.org, 
	mic@...ikod.net, linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org, 
	linux-nfs@...r.kernel.org, linux-security-module@...r.kernel.org, 
	linux-integrity@...r.kernel.org, keyrings@...r.kernel.org, selinux@...r.kernel.org, 
	linux-kselftest@...r.kernel.org, Roberto Sassu <roberto.sassu@...wei.com>
Subject: Re: [PATCH v9 22/25] evm: Move to LSM infrastructure

On Mon, Jan 15, 2024 at 07:18:06PM +0100, Roberto Sassu wrote:
> From: Roberto Sassu <roberto.sassu@...wei.com>
> 
> As for IMA, move hardcoded EVM function calls from various places in the
> kernel to the LSM infrastructure, by introducing a new LSM named 'evm'
> (last and always enabled like 'ima'). The order in the Makefile ensures
> that 'evm' hooks are executed after 'ima' ones.
> 
> Make EVM functions as static (except for evm_inode_init_security(), which
> is exported), and register them as hook implementations in init_evm_lsm().
> Also move the inline functions evm_inode_remove_acl(),
> evm_inode_post_remove_acl(), and evm_inode_post_set_acl() from the public
> evm.h header to evm_main.c.
> 
> Unlike before (see commit to move IMA to the LSM infrastructure),
> evm_inode_post_setattr(), evm_inode_post_set_acl(),
> evm_inode_post_remove_acl(), and evm_inode_post_removexattr() are not
> executed for private inodes.
> 
> Finally, add the LSM_ID_EVM case in lsm_list_modules_test.c
> 
> Signed-off-by: Roberto Sassu <roberto.sassu@...wei.com>
> Reviewed-by: Casey Schaufler <casey@...aufler-ca.com>
> ---
>  fs/attr.c                                     |   2 -
>  fs/posix_acl.c                                |   3 -
>  fs/xattr.c                                    |   2 -

Acked-by: Christian Brauner <brauner@...nel.org>