[RFC][PATCH 2/6] ima: added new template helper lookup_template_desc_by_fmt()

[Roberto Sassu]

This patch adds a new helper to search a template descriptor by its format.
Also, the old function lookup_template_desc(), which performs the search
by name, has been renamed to lookup_template_desc_by_name().

Signed-off-by: Roberto Sassu <roberto.sa...@polito.it>
---
 security/integrity/ima/ima_template.c | 20 ++++++++++++++++----
 1 file changed, 16 insertions(+), 4 deletions(-)

diff --git a/security/integrity/ima/ima_template.c 
b/security/integrity/ima/ima_template.c
index 33c911a..c849723 100644
--- a/security/integrity/ima/ima_template.c
+++ b/security/integrity/ima/ima_template.c
@@ -38,7 +38,7 @@ static struct ima_template_field supported_fields[] = {
 };
 
 static struct ima_template_desc *ima_template;
-static struct ima_template_desc *lookup_template_desc(const char *name);
+static struct ima_template_desc *lookup_template_desc_by_name(const char 
*name);
 static struct ima_template_field *lookup_template_field(const char *field_id);
 
 static int __init ima_template_setup(char *str)
@@ -53,7 +53,7 @@ static int __init ima_template_setup(char *str)
         * Verify that a template with the supplied name exists.
         * If not, use CONFIG_IMA_DEFAULT_TEMPLATE.
         */
-       template_desc = lookup_template_desc(str);
+       template_desc = lookup_template_desc_by_name(str);
        if (!template_desc) {
                pr_err("IMA: template %s not found, using %s\n",
                       str, CONFIG_IMA_DEFAULT_TEMPLATE);
@@ -117,7 +117,7 @@ static int __init ima_template_fmt_setup(char *str)
 }
 __setup("ima_template_fmt=", ima_template_fmt_setup);
 
-static struct ima_template_desc *lookup_template_desc(const char *name)
+static struct ima_template_desc *lookup_template_desc_by_name(const char *name)
 {
        int i;
 
@@ -129,6 +129,18 @@ static struct ima_template_desc 
*lookup_template_desc(const char *name)
        return NULL;
 }
 
+static struct ima_template_desc *lookup_template_desc_by_fmt(const char *fmt)
+{
+       struct ima_template_desc *desc;
+
+       list_for_each_entry(desc, &defined_templates[0].list, list) {
+               if (strcmp(desc->fmt, fmt) == 0)
+                       return desc;
+       }
+
+       return NULL;
+}
+
 static struct ima_template_field *lookup_template_field(const char *field_id)
 {
        int i;
@@ -232,7 +244,7 @@ struct ima_template_desc *ima_template_desc_current(void)
 {
        if (!ima_template)
                ima_template =
-                   lookup_template_desc(CONFIG_IMA_DEFAULT_TEMPLATE);
+                   lookup_template_desc_by_name(CONFIG_IMA_DEFAULT_TEMPLATE);
        return ima_template;
 }
 
-- 
1.8.1.4

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