linux-kernel - Re: [PATCH v5 04/10] IMA: Updated IMA policy functions to return keyrings option read from the policy

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Message-Id: <1573578316.17949.43.camel@linux.ibm.com>
Date:   Tue, 12 Nov 2019 12:05:16 -0500
From:   Mimi Zohar <zohar@...ux.ibm.com>
To:     Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>,
        dhowells@...hat.com, matthewgarrett@...gle.com, sashal@...nel.org,
        jamorris@...ux.microsoft.com, linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org, keyrings@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 04/10] IMA: Updated IMA policy functions to return
 keyrings option read from the policy

On Mon, 2019-11-11 at 11:32 -0800, Lakshmi Ramasubramanian wrote:
> diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c
> index 1aee3c8b9cf6..d1889eee9287 100644
> --- a/security/integrity/ima/ima_policy.c
> +++ b/security/integrity/ima/ima_policy.c
> @@ -481,6 +481,7 @@ static int get_subaction(struct ima_rule_entry *rule, enum ima_hooks func)
>   * @mask: requested action (MAY_READ | MAY_WRITE | MAY_APPEND | MAY_EXEC)
>   * @pcr: set the pcr to extend
>   * @template_desc: the template that should be used for this rule
> + * @keyrings: set the keyrings for this rule, if specified
>   *
>   * Measure decision based on func/mask/fsmagic and LSM(subj/obj/type)
>   * conditions.
> @@ -491,7 +492,8 @@ static int get_subaction(struct ima_rule_entry *rule, enum ima_hooks func)
>   */
>  int ima_match_policy(struct inode *inode, const struct cred *cred, u32 secid,
>  		     enum ima_hooks func, int mask, int flags, int *pcr,
> -		     struct ima_template_desc **template_desc)
> +		     struct ima_template_desc **template_desc,
> +		     char **keyrings)
>  {
>  	struct ima_rule_entry *entry;
>  	int action = 0, actmask = flags | (flags << 1);
> @@ -527,6 +529,9 @@ int ima_match_policy(struct inode *inode, const struct cred *cred, u32 secid,
>  		if ((pcr) && (entry->flags & IMA_PCR))
>  			*pcr = entry->pcr;
>  
> +		if ((keyrings) && (entry->flags & IMA_KEYRINGS))
> +			*keyrings = entry->keyrings;

ima_match_rules() determines whether the rule is in policy or not. It
returns true on rule match, false on failure.  There's no need to
return the list of keyrings.

Mimi 

> +
>  		if (template_desc && entry->template)
>  			*template_desc = entry->template;
>