SELinux: more user friendly unknown handling printk

I've gotten complaints and reports about people not understanding the
meaning of the current unknown class/perm handling the kernel emits on
every policy load.  Hopefully this will make make it clear to everyone
the meaning of the message and won't waste a printk the user won't care
about anyway on systems where the kernel and the policy agree on
everything.

Signed-off-by: Eric Paris <eparis@redhat.com>
Signed-off-by: James Morris <jmorris@namei.org>

diff --git a/security/selinux/selinuxfs.c b/security/selinux/selinuxfs.c
index 07a5db6..69c9dcc 100644 (file)
--- a/security/selinux/selinuxfs.c
+++ b/security/selinux/selinuxfs.c
@@ -356,11 +356,6 @@ static ssize_t sel_write_load(struct file *file, const char __user *buf,
                length = count;
 
 out1:
-
-       printk(KERN_INFO "SELinux: policy loaded with handle_unknown=%s\n",
-              (security_get_reject_unknown() ? "reject" :
-               (security_get_allow_unknown() ? "allow" : "deny")));
-
        audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
                "policy loaded auid=%u ses=%u",
                audit_get_loginuid(current),

diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c
index 04c0b70..b52f923 100644 (file)
--- a/security/selinux/ss/services.c
+++ b/security/selinux/ss/services.c
@@ -1171,6 +1171,7 @@ static int validate_classes(struct policydb *p)
        const struct selinux_class_perm *kdefs = &selinux_class_perm;
        const char *def_class, *def_perm, *pol_class;
        struct symtab *perms;
+       bool print_unknown_handle = 0;
 
        if (p->allow_unknown) {
                u32 num_classes = kdefs->cts_len;
@@ -1191,6 +1192,7 @@ static int validate_classes(struct policydb *p)
                                return -EINVAL;
                        if (p->allow_unknown)
                                p->undefined_perms[i-1] = ~0U;
+                       print_unknown_handle = 1;
                        continue;
                }
                pol_class = p->p_class_val_to_name[i-1];
@@ -1220,6 +1222,7 @@ static int validate_classes(struct policydb *p)
                                return -EINVAL;
                        if (p->allow_unknown)
                                p->undefined_perms[class_val-1] |= perm_val;
+                       print_unknown_handle = 1;
                        continue;
                }
                perdatum = hashtab_search(perms->table, def_perm);
@@ -1267,6 +1270,7 @@ static int validate_classes(struct policydb *p)
                                        return -EINVAL;
                                if (p->allow_unknown)
                                        p->undefined_perms[class_val-1] |= (1 << j);
+                               print_unknown_handle = 1;
                                continue;
                        }
                        perdatum = hashtab_search(perms->table, def_perm);
@@ -1284,6 +1288,9 @@ static int validate_classes(struct policydb *p)
                        }
                }
        }
+       if (print_unknown_handle)
+               printk(KERN_INFO "SELinux: the above unknown classes and permissions will be %s\n",
+                       (security_get_allow_unknown() ? "allowed" : "denied"));
        return 0;
 }