linux-kernel - Re: [PATCH] security: inode: fix a missing check for securityfs_create

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Message-ID: <alpine.LRH.2.21.1903160608080.2905@namei.org>
Date:   Sat, 16 Mar 2019 06:08:43 +1100 (AEDT)
From:   James Morris <jmorris@...ei.org>
To:     Kangjie Lu <kjlu@....edu>
cc:     pakki001@....edu, "Serge E. Hallyn" <serge@...lyn.com>,
        linux-security-module@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Casey Schaufler <casey@...aufler-ca.com>
Subject: Re: [PATCH] security: inode: fix a missing check for
 securityfs_create_file

On Thu, 14 Mar 2019, Kangjie Lu wrote:

> securityfs_create_file  may fail. The fix checks its status and
> returns EFAULT upstream if it fails.
> 
> Signed-off-by: Kangjie Lu <kjlu@....edu>
> ---
>  security/inode.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/security/inode.c b/security/inode.c
> index b7772a9b315e..11d9a6bc2161 100644
> --- a/security/inode.c
> +++ b/security/inode.c
> @@ -339,6 +339,11 @@ static int __init securityfs_init(void)
>  #ifdef CONFIG_SECURITY
>  	lsm_dentry = securityfs_create_file("lsm", 0444, NULL, NULL,
>  						&lsm_ops);
> +	if (IS_ERR(lsm_dentry)) {
> +		unregister_filesystem(&fs_type);
> +		sysfs_remove_mount_point(kernel_kobj, "security");
> +		return -EFAULT;
> +	}
>  #endif
>  	return 0;
>  }
> 

Good catch, but you should propagate the error returned from 
securityfs_create_file().


-- 
James Morris
<jmorris@...ei.org>