linux-kernel - Re: [PATCH 18/28] security: Introduce path_post

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Date:   Wed, 08 Mar 2023 10:47:52 -0500
From:   Mimi Zohar <zohar@...ux.ibm.com>
To:     Roberto Sassu <roberto.sassu@...weicloud.com>,
        viro@...iv.linux.org.uk, chuck.lever@...cle.com,
        jlayton@...nel.org, dmitry.kasatkin@...il.com, paul@...l-moore.com,
        jmorris@...ei.org, serge@...lyn.com, dhowells@...hat.com,
        jarkko@...nel.org, stephen.smalley.work@...il.com,
        eparis@...isplace.org, casey@...aufler-ca.com, brauner@...nel.org
Cc:     linux-fsdevel@...r.kernel.org, linux-nfs@...r.kernel.org,
        linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org, keyrings@...r.kernel.org,
        selinux@...r.kernel.org, linux-kernel@...r.kernel.org,
        stefanb@...ux.ibm.com, Roberto Sassu <roberto.sassu@...wei.com>
Subject: Re: [PATCH 18/28] security: Introduce path_post_mknod hook

Hi Roberto,

On Fri, 2023-03-03 at 19:18 +0100, Roberto Sassu wrote:
> From: Roberto Sassu <roberto.sassu@...wei.com>
> 
> In preparation for moving IMA and EVM to the LSM infrastructure, introduce
> the path_post_mknod hook.
> 
> Signed-off-by: Roberto Sassu <roberto.sassu@...wei.com>
> ---
>  fs/namei.c                    |  2 ++
>  include/linux/lsm_hook_defs.h |  3 +++
>  include/linux/security.h      |  9 +++++++++
>  security/security.c           | 19 +++++++++++++++++++
>  4 files changed, 33 insertions(+)
> 
> diff --git a/fs/namei.c b/fs/namei.c
> index 41f7fdf4657..3f2747521d3 100644
> --- a/fs/namei.c
> +++ b/fs/namei.c
> @@ -3980,6 +3980,8 @@ static int do_mknodat(int dfd, struct filename *name, umode_t mode,
>  					  dentry, mode, 0);
>  			break;
>  	}
> +	if (!error)
> +		security_path_post_mknod(idmap, &path, dentry, mode, dev);

Even though the original code uses "if (!error) ...",  consider using
"if (error) goto ..." here.

-- 
thanks,

Mimi