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authorRoberto Sassu <roberto.sassu@polito.it>2014-10-13 16:08:39 +0400
committerMimi Zohar <zohar@linux.vnet.ibm.com>2014-10-13 16:39:01 +0400
commit7dbdb4206bd69bf518fd76e01f4c5c64cda96455 (patch)
tree29e4d56591d813bfffaf7172ec98b760c9a9fc5a /security/integrity
parent71fed2eee0ea76b236f491006078c9d636323184 (diff)
downloadlinux-7dbdb4206bd69bf518fd76e01f4c5c64cda96455.tar.xz
ima: display template format in meas. list if template name length is zero
With the introduction of the 'ima_template_fmt' kernel cmdline parameter, a user can define a new template descriptor with custom format. However, in this case, userspace tools will be unable to parse the measurements list because the new template is unknown. For this reason, this patch modifies the current IMA behavior to display in the list the template format instead of the name (only if the length of the latter is zero) so that a tool can extract needed information if it can handle listed fields. This patch also correctly displays the error log message in ima_init_template() if the selected template cannot be initialized. Changelog: - v3: - check the first byte of 'e->template_desc->name' instead of using strlen() in ima_fs.c (suggested by Mimi Zohar) - v2: - print the template format in ima_init_template(), if the selected template is custom (Roberto Sassu) - v1: - fixed patch description (Roberto Sassu, suggested by Mimi Zohar) - set 'template_name' variable in ima_fs.c only once (Roberto Sassu, suggested by Mimi Zohar) Signed-off-by: Roberto Sassu <roberto.sassu@polito.it> Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Diffstat (limited to 'security/integrity')
-rw-r--r--security/integrity/ima/ima_fs.c16
-rw-r--r--security/integrity/ima/ima_template.c4
2 files changed, 15 insertions, 5 deletions
diff --git a/security/integrity/ima/ima_fs.c b/security/integrity/ima/ima_fs.c
index 973b5683a92e..461215e5fd31 100644
--- a/security/integrity/ima/ima_fs.c
+++ b/security/integrity/ima/ima_fs.c
@@ -118,6 +118,7 @@ static int ima_measurements_show(struct seq_file *m, void *v)
/* the list never shrinks, so we don't need a lock here */
struct ima_queue_entry *qe = v;
struct ima_template_entry *e;
+ char *template_name;
int namelen;
u32 pcr = CONFIG_IMA_MEASURE_PCR_IDX;
bool is_ima_template = false;
@@ -128,6 +129,9 @@ static int ima_measurements_show(struct seq_file *m, void *v)
if (e == NULL)
return -1;
+ template_name = (e->template_desc->name[0] != '\0') ?
+ e->template_desc->name : e->template_desc->fmt;
+
/*
* 1st: PCRIndex
* PCR used is always the same (config option) in
@@ -139,14 +143,14 @@ static int ima_measurements_show(struct seq_file *m, void *v)
ima_putc(m, e->digest, TPM_DIGEST_SIZE);
/* 3rd: template name size */
- namelen = strlen(e->template_desc->name);
+ namelen = strlen(template_name);
ima_putc(m, &namelen, sizeof(namelen));
/* 4th: template name */
- ima_putc(m, e->template_desc->name, namelen);
+ ima_putc(m, template_name, namelen);
/* 5th: template length (except for 'ima' template) */
- if (strcmp(e->template_desc->name, IMA_TEMPLATE_IMA_NAME) == 0)
+ if (strcmp(template_name, IMA_TEMPLATE_IMA_NAME) == 0)
is_ima_template = true;
if (!is_ima_template)
@@ -200,6 +204,7 @@ static int ima_ascii_measurements_show(struct seq_file *m, void *v)
/* the list never shrinks, so we don't need a lock here */
struct ima_queue_entry *qe = v;
struct ima_template_entry *e;
+ char *template_name;
int i;
/* get entry */
@@ -207,6 +212,9 @@ static int ima_ascii_measurements_show(struct seq_file *m, void *v)
if (e == NULL)
return -1;
+ template_name = (e->template_desc->name[0] != '\0') ?
+ e->template_desc->name : e->template_desc->fmt;
+
/* 1st: PCR used (config option) */
seq_printf(m, "%2d ", CONFIG_IMA_MEASURE_PCR_IDX);
@@ -214,7 +222,7 @@ static int ima_ascii_measurements_show(struct seq_file *m, void *v)
ima_print_digest(m, e->digest, TPM_DIGEST_SIZE);
/* 3th: template name */
- seq_printf(m, " %s", e->template_desc->name);
+ seq_printf(m, " %s", template_name);
/* 4th: template specific data */
for (i = 0; i < e->template_desc->num_fields; i++) {
diff --git a/security/integrity/ima/ima_template.c b/security/integrity/ima/ima_template.c
index 1310afc587f3..b7b359ca39ee 100644
--- a/security/integrity/ima/ima_template.c
+++ b/security/integrity/ima/ima_template.c
@@ -176,7 +176,9 @@ int __init ima_init_template(void)
&(template->fields),
&(template->num_fields));
if (result < 0)
- pr_err("template %s init failed, result: %d\n", template->name);
+ pr_err("template %s init failed, result: %d\n",
+ (strlen(template->name) ?
+ template->name : template->fmt), result);
return result;
}