linux-kernel - [RFC][PATCH 1/6] ima: connect defined IMA templates through a linked list

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Date:	Thu,  7 Nov 2013 16:49:36 +0100
From:	Roberto Sassu <roberto.sassu@...ito.it>
To:	linux-security-module@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	linux-ima-devel@...ts.sourceforge.net, zohar@...ibm.com,
	d.kasatkin@...sung.com, james.l.morris@...cle.com,
	Roberto Sassu <roberto.sassu@...ito.it>
Subject: [RFC][PATCH 1/6] ima: connect defined IMA templates through a linked list

This patch connects defined templates through a linked list so that it
will be possible to append new descriptors when the functionality
of specifying a custom template in the policy will be introduced.
Template search by name is still performed by iterating over
'defined_templates' array items.

Signed-off-by: Roberto Sassu <roberto.sassu@...ito.it>
---
 security/integrity/ima/ima.h          | 1 +
 security/integrity/ima/ima_template.c | 5 +++++
 2 files changed, 6 insertions(+)

diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h
index bf03c6a..5cbe881 100644
--- a/security/integrity/ima/ima.h
+++ b/security/integrity/ima/ima.h
@@ -67,6 +67,7 @@ struct ima_template_field {
 
 /* IMA template descriptor definition */
 struct ima_template_desc {
+	struct list_head list;
 	char *name;
 	char *fmt;
 	int num_fields;
diff --git a/security/integrity/ima/ima_template.c b/security/integrity/ima/ima_template.c
index 5a95d06..33c911a 100644
--- a/security/integrity/ima/ima_template.c
+++ b/security/integrity/ima/ima_template.c
@@ -204,6 +204,7 @@ static int init_defined_templates(void)
 	int result = 0;
 
 	/* Init defined templates. */
+	INIT_LIST_HEAD(&defined_templates[0].list);
 	for (i = 0; i < ARRAY_SIZE(defined_templates); i++) {
 		struct ima_template_desc *template = &defined_templates[i];
 
@@ -219,6 +220,10 @@ static int init_defined_templates(void)
 			       template->name : template->fmt), result);
 			return result;
 		}
+
+		if (i > 0)
+			list_add_tail(&defined_templates[i].list,
+				      &defined_templates[0].list);
 	}
 	return result;
 }
-- 
1.8.1.4


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