Smack: allow to access /smack/access as normal user

Allow query access as a normal user removing the need
for CAP_MAC_ADMIN. Give RW access to /smack/access
for UGO. Do not import smack labels in access check.

Signed-off-by: Jarkko Sakkinen <jarkko.j.sakkinen@gmail.com>
Signed-off-by: Casey Schaufler <cschaufler@cschaufler-intel.(none)>

1 files changed, 19 insertions, 8 deletions

diff --git a/security/smack/smack_access.c b/security/smack/smack_access.c
index a885f628f56..cc7cb6edba0 100644
--- a/security/smack/smack_access.c
+++ b/security/smack/smack_access.c
@@ -353,17 +353,13 @@ struct smack_known *smk_find_entry(const char *string)
 }
 
 /**
- * smk_import_entry - import a label, return the list entry
- * @string: a text string that might be a Smack label
+ * smk_parse_smack - parse smack label from a text string
+ * @string: a text string that might contain a Smack label
  * @len: the maximum size, or zero if it is NULL terminated.
- *
- * Returns a pointer to the entry in the label list that
- * matches the passed string, adding it if necessary.
+ * @smack: parsed smack label, or NULL if parse error
  */
-struct smack_known *smk_import_entry(const char *string, int len)
+void smk_parse_smack(const char *string, int len, char *smack)
 {
-	struct smack_known *skp;
-	char smack[SMK_LABELLEN];
 	int found;
 	int i;
 
@@ -381,7 +377,22 @@ struct smack_known *smk_import_entry(const char *string, int len)
 		} else
 			smack[i] = string[i];
 	}
+}
+
+/**
+ * smk_import_entry - import a label, return the list entry
+ * @string: a text string that might be a Smack label
+ * @len: the maximum size, or zero if it is NULL terminated.
+ *
+ * Returns a pointer to the entry in the label list that
+ * matches the passed string, adding it if necessary.
+ */
+struct smack_known *smk_import_entry(const char *string, int len)
+{
+	struct smack_known *skp;
+	char smack[SMK_LABELLEN];
 
+	smk_parse_smack(string, len, smack);
 	if (smack[0] == '\0')
 		return NULL;