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Subject[PATCH v8 08/10] ima: support restoring multiple template formats
Date
The configured IMA measurement list template format can be replaced at
runtime on the boot command line, including a custom template format.
This patch adds support for restoring a measuremement list containing
multiple builtin/custom template formats.

Changelog v7:
- remove unnecessary "synchronize_rcu" (reported by Dmitry Kasatkin)

Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Acked-by: Dmitry Kasatkin <dmitry.kasatkin@gmail.com>
---
security/integrity/ima/ima_template.c | 52 +++++++++++++++++++++++++++++++++--
1 file changed, 49 insertions(+), 3 deletions(-)

diff --git a/security/integrity/ima/ima_template.c b/security/integrity/ima/ima_template.c
index 6d60a0847b54..16bbb5a80fc8 100644
--- a/security/integrity/ima/ima_template.c
+++ b/security/integrity/ima/ima_template.c
@@ -155,9 +155,14 @@ static int template_desc_init_fields(const char *template_fmt,
{
const char *template_fmt_ptr;
struct ima_template_field *found_fields[IMA_TEMPLATE_NUM_FIELDS_MAX];
- int template_num_fields = template_fmt_size(template_fmt);
+ int template_num_fields;
int i, len;

+ if (num_fields && *num_fields > 0) /* already initialized? */
+ return 0;
+
+ template_num_fields = template_fmt_size(template_fmt);
+
if (template_num_fields > IMA_TEMPLATE_NUM_FIELDS_MAX) {
pr_err("format string '%s' contains too many fields\n",
template_fmt);
@@ -236,6 +241,34 @@ int __init ima_init_template(void)
return result;
}

+static struct ima_template_desc *restore_template_fmt(char *template_name)
+{
+ struct ima_template_desc *template_desc = NULL;
+ int ret;
+
+ ret = template_desc_init_fields(template_name, NULL, NULL);
+ if (ret < 0) {
+ pr_err("attempting to initialize the template \"%s\" failed\n",
+ template_name);
+ goto out;
+ }
+
+ template_desc = kzalloc(sizeof(*template_desc), GFP_KERNEL);
+ if (!template_desc)
+ goto out;
+
+ template_desc->name = "";
+ template_desc->fmt = kstrdup(template_name, GFP_KERNEL);
+ if (!template_desc->fmt)
+ goto out;
+
+ spin_lock(&template_list);
+ list_add_tail_rcu(&template_desc->list, &defined_templates);
+ spin_unlock(&template_list);
+out:
+ return template_desc;
+}
+
static int ima_restore_template_data(struct ima_template_desc *template_desc,
void *template_data,
int template_data_size,
@@ -373,10 +406,23 @@ int ima_restore_measurement_list(loff_t size, void *buf)
break;
}

- /* get template format */
template_desc = lookup_template_desc(template_name);
if (!template_desc) {
- pr_err("template \"%s\" not found\n", template_name);
+ template_desc = restore_template_fmt(template_name);
+ if (!template_desc)
+ break;
+ }
+
+ /*
+ * Only the running system's template format is initialized
+ * on boot. As needed, initialize the other template formats.
+ */
+ ret = template_desc_init_fields(template_desc->fmt,
+ &(template_desc->fields),
+ &(template_desc->num_fields));
+ if (ret < 0) {
+ pr_err("attempting to restore the template fmt \"%s\" \
+ failed\n", template_desc->fmt);
ret = -EINVAL;
break;
}
--
2.1.0
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