Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security

Pull security layer updates from James Morris:
 "In terms of changes, there's general maintenance to the Smack,
  SELinux, and integrity code.

  The IMA code adds a new kconfig option, IMA_APPRAISE_SIGNED_INIT,
  which allows IMA appraisal to require signatures.  Support for reading
  keys from rootfs before init is call is also added"

* 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security: (23 commits)
  selinux: Remove security_ops extern
  security: smack: fix out-of-bounds access in smk_parse_smack()
  VFS: refactor vfs_read()
  ima: require signature based appraisal
  integrity: provide a hook to load keys when rootfs is ready
  ima: load x509 certificate from the kernel
  integrity: provide a function to load x509 certificate from the kernel
  integrity: define a new function integrity_read_file()
  Security: smack: replace kzalloc with kmem_cache for inode_smack
  Smack: Lock mode for the floor and hat labels
  ima: added support for new kernel cmdline parameter ima_template_fmt
  ima: allocate field pointers array on demand in template_desc_init_fields()
  ima: don't allocate a copy of template_fmt in template_desc_init_fields()
  ima: display template format in meas. list if template name length is zero
  ima: added error messages to template-related functions
  ima: use atomic bit operations to protect policy update interface
  ima: ignore empty and with whitespaces policy lines
  ima: no need to allocate entry for comment
  ima: report policy load status
  ima: use path names cache
  ...

1 files changed, 14 insertions, 28 deletions

diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c
index cdc620b2152f..d1eefb9d65fb 100644
--- a/security/integrity/ima/ima_policy.c
+++ b/security/integrity/ima/ima_policy.c
@@ -100,7 +100,13 @@ static struct ima_rule_entry default_appraise_rules[] = {
 	{.action = DONT_APPRAISE, .fsmagic = SECURITYFS_MAGIC, .flags = IMA_FSMAGIC},
 	{.action = DONT_APPRAISE, .fsmagic = SELINUX_MAGIC, .flags = IMA_FSMAGIC},
 	{.action = DONT_APPRAISE, .fsmagic = CGROUP_SUPER_MAGIC, .flags = IMA_FSMAGIC},
+#ifndef CONFIG_IMA_APPRAISE_SIGNED_INIT
 	{.action = APPRAISE, .fowner = GLOBAL_ROOT_UID, .flags = IMA_FOWNER},
+#else
+	/* force signature */
+	{.action = APPRAISE, .fowner = GLOBAL_ROOT_UID,
+	 .flags = IMA_FOWNER | IMA_DIGSIG_REQUIRED},
+#endif
 };
 
 static LIST_HEAD(ima_default_rules);
@@ -356,19 +362,8 @@ void __init ima_init_policy(void)
  */
 void ima_update_policy(void)
 {
-	static const char op[] = "policy_update";
-	const char *cause = "already-exists";
-	int result = 1;
-	int audit_info = 0;
-
-	if (ima_rules == &ima_default_rules) {
-		ima_rules = &ima_policy_rules;
-		ima_update_policy_flag();
-		cause = "complete";
-		result = 0;
-	}
-	integrity_audit_msg(AUDIT_INTEGRITY_STATUS, NULL,
-			    NULL, op, cause, result, audit_info);
+	ima_rules = &ima_policy_rules;
+	ima_update_policy_flag();
 }
 
 enum {
@@ -686,13 +681,12 @@ ssize_t ima_parse_add_rule(char *rule)
 	ssize_t result, len;
 	int audit_info = 0;
 
-	/* Prevent installed policy from changing */
-	if (ima_rules != &ima_default_rules) {
-		integrity_audit_msg(AUDIT_INTEGRITY_STATUS, NULL,
-				    NULL, op, "already-exists",
-				    -EACCES, audit_info);
-		return -EACCES;
-	}
+	p = strsep(&rule, "\n");
+	len = strlen(p) + 1;
+	p += strspn(p, " \t");
+
+	if (*p == '#' || *p == '\0')
+		return len;
 
 	entry = kzalloc(sizeof(*entry), GFP_KERNEL);
 	if (!entry) {
@@ -703,14 +697,6 @@ ssize_t ima_parse_add_rule(char *rule)
 
 	INIT_LIST_HEAD(&entry->list);
 
-	p = strsep(&rule, "\n");
-	len = strlen(p) + 1;
-
-	if (*p == '#') {
-		kfree(entry);
-		return len;
-	}
-
 	result = ima_parse_rule(p, entry);
 	if (result) {
 		kfree(entry);