aboutsummaryrefslogtreecommitdiffstats
path: root/security/integrity/ima/ima_template.c
diff options
context:
space:
mode:
Diffstat (limited to 'security/integrity/ima/ima_template.c')
-rw-r--r--security/integrity/ima/ima_template.c103
1 files changed, 71 insertions, 32 deletions
diff --git a/security/integrity/ima/ima_template.c b/security/integrity/ima/ima_template.c
index e854862c9337..0b7404ebfa80 100644
--- a/security/integrity/ima/ima_template.c
+++ b/security/integrity/ima/ima_template.c
@@ -24,6 +24,7 @@ static struct ima_template_desc defined_templates[] = {
{.name = IMA_TEMPLATE_IMA_NAME, .fmt = IMA_TEMPLATE_IMA_FMT},
{.name = "ima-ng", .fmt = "d-ng|n-ng"},
{.name = "ima-sig", .fmt = "d-ng|n-ng|sig"},
+ {.name = "", .fmt = ""}, /* placeholder for a custom format */
};
static struct ima_template_field supported_fields[] = {
@@ -41,19 +42,28 @@ 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 int template_desc_init_fields(const char *template_fmt,
+ struct ima_template_field ***fields,
+ int *num_fields);
static int __init ima_template_setup(char *str)
{
struct ima_template_desc *template_desc;
int template_len = strlen(str);
+ if (ima_template)
+ return 1;
+
/*
* Verify that a template with the supplied name exists.
* If not, use CONFIG_IMA_DEFAULT_TEMPLATE.
*/
template_desc = lookup_template_desc(str);
- if (!template_desc)
+ if (!template_desc) {
+ pr_err("template %s not found, using %s\n",
+ str, CONFIG_IMA_DEFAULT_TEMPLATE);
return 1;
+ }
/*
* Verify whether the current hash algorithm is supported
@@ -70,6 +80,25 @@ static int __init ima_template_setup(char *str)
}
__setup("ima_template=", ima_template_setup);
+static int __init ima_template_fmt_setup(char *str)
+{
+ int num_templates = ARRAY_SIZE(defined_templates);
+
+ if (ima_template)
+ return 1;
+
+ if (template_desc_init_fields(str, NULL, NULL) < 0) {
+ pr_err("format string '%s' not valid, using template %s\n",
+ str, CONFIG_IMA_DEFAULT_TEMPLATE);
+ return 1;
+ }
+
+ defined_templates[num_templates - 1].fmt = str;
+ ima_template = defined_templates + num_templates - 1;
+ return 1;
+}
+__setup("ima_template_fmt=", ima_template_fmt_setup);
+
static struct ima_template_desc *lookup_template_desc(const char *name)
{
int i;
@@ -113,43 +142,46 @@ static int template_desc_init_fields(const char *template_fmt,
struct ima_template_field ***fields,
int *num_fields)
{
- char *c, *template_fmt_copy, *template_fmt_ptr;
+ 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 i, result = 0;
+ int i, len;
- if (template_num_fields > IMA_TEMPLATE_NUM_FIELDS_MAX)
+ if (template_num_fields > IMA_TEMPLATE_NUM_FIELDS_MAX) {
+ pr_err("format string '%s' contains too many fields\n",
+ template_fmt);
return -EINVAL;
-
- /* copying is needed as strsep() modifies the original buffer */
- template_fmt_copy = kstrdup(template_fmt, GFP_KERNEL);
- if (template_fmt_copy == NULL)
- return -ENOMEM;
-
- *fields = kzalloc(template_num_fields * sizeof(*fields), GFP_KERNEL);
- if (*fields == NULL) {
- result = -ENOMEM;
- goto out;
}
- template_fmt_ptr = template_fmt_copy;
- for (i = 0; (c = strsep(&template_fmt_ptr, "|")) != NULL &&
- i < template_num_fields; i++) {
- struct ima_template_field *f = lookup_template_field(c);
+ for (i = 0, template_fmt_ptr = template_fmt; i < template_num_fields;
+ i++, template_fmt_ptr += len + 1) {
+ char tmp_field_id[IMA_TEMPLATE_FIELD_ID_MAX_LEN + 1];
+
+ len = strchrnul(template_fmt_ptr, '|') - template_fmt_ptr;
+ if (len == 0 || len > IMA_TEMPLATE_FIELD_ID_MAX_LEN) {
+ pr_err("Invalid field with length %d\n", len);
+ return -EINVAL;
+ }
- if (!f) {
- result = -ENOENT;
- goto out;
+ memcpy(tmp_field_id, template_fmt_ptr, len);
+ tmp_field_id[len] = '\0';
+ found_fields[i] = lookup_template_field(tmp_field_id);
+ if (!found_fields[i]) {
+ pr_err("field '%s' not found\n", tmp_field_id);
+ return -ENOENT;
}
- (*fields)[i] = f;
}
- *num_fields = i;
-out:
- if (result < 0) {
- kfree(*fields);
- *fields = NULL;
+
+ if (fields && num_fields) {
+ *fields = kmalloc_array(i, sizeof(*fields), GFP_KERNEL);
+ if (*fields == NULL)
+ return -ENOMEM;
+
+ memcpy(*fields, found_fields, i * sizeof(*fields));
+ *num_fields = i;
}
- kfree(template_fmt_copy);
- return result;
+
+ return 0;
}
struct ima_template_desc *ima_template_desc_current(void)
@@ -163,8 +195,15 @@ struct ima_template_desc *ima_template_desc_current(void)
int __init ima_init_template(void)
{
struct ima_template_desc *template = ima_template_desc_current();
+ int result;
+
+ result = template_desc_init_fields(template->fmt,
+ &(template->fields),
+ &(template->num_fields));
+ if (result < 0)
+ pr_err("template %s init failed, result: %d\n",
+ (strlen(template->name) ?
+ template->name : template->fmt), result);
- return template_desc_init_fields(template->fmt,
- &(template->fields),
- &(template->num_fields));
+ return result;
}

Privacy Policy