linux-kernel - Re: [PATCH v2] ima: drop vla in ima_audit

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Date:   Thu, 08 Mar 2018 15:36:14 -0500
From:   Mimi Zohar <zohar@...ux.vnet.ibm.com>
To:     Tycho Andersen <tycho@...ho.ws>,
        Dmitry Kasatkin <dmitry.kasatkin@...il.com>
Cc:     linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-hardening@...ts.openwall.com
Subject: Re: [PATCH v2] ima: drop vla in ima_audit_measurement()

On Thu, 2018-03-08 at 13:23 -0700, Tycho Andersen wrote:

>  /*
> diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
> index 2cfb0c714967..356faae6f09c 100644
> --- a/security/integrity/ima/ima_main.c
> +++ b/security/integrity/ima/ima_main.c
> @@ -288,8 +288,11 @@ static int process_measurement(struct file *file, char *buf, loff_t size,
>  					      xattr_value, xattr_len, opened);
>  		inode_unlock(inode);
>  	}
> -	if (action & IMA_AUDIT)
> -		ima_audit_measurement(iint, pathname);
> +	if (action & IMA_AUDIT) {
> +		rc = ima_audit_measurement(iint, pathname);
> +		if (rc < 0)
> +			goto out_locked;
> +	}
> 
>  	if ((file->f_flags & O_DIRECT) && (iint->flags & IMA_PERMIT_DIRECTIO))
>  		rc = 0;

Only when IMA-appraisal is enforcing file data integrity should
process_measurement() ever fail.  Other errors can be logged/audited.

Mimi