AppArmor: Fix locking from removal of profile namespace

The locking for profile namespace removal is wrong, when removing a
profile namespace, it needs to be removed from its parent's list.
Lock the parent of namespace list instead of the namespace being removed.

Signed-off-by: John Johansen <john.johansen@canonical.com>
Signed-off-by: James Morris <jmorris@namei.org>

diff --git a/security/apparmor/policy.c b/security/apparmor/policy.c
index 3cdc1ad0787ec9c4769455f8aeb004a417d246bf..52cc865f1464574e696fd28eca6a6e0eed326d68 100644 (file)
--- a/security/apparmor/policy.c
+++ b/security/apparmor/policy.c
@@ -1151,12 +1151,14 @@ ssize_t aa_remove_profiles(char *fqname, size_t size)
                /* released below */
                ns = aa_get_namespace(root);
 
-       write_lock(&ns->lock);
        if (!name) {
                /* remove namespace - can only happen if fqname[0] == ':' */
+               write_lock(&ns->parent->lock);
                __remove_namespace(ns);
+               write_unlock(&ns->parent->lock);
        } else {
                /* remove profile */
+               write_lock(&ns->lock);
                profile = aa_get_profile(__lookup_profile(&ns->base, name));
                if (!profile) {
                        error = -ENOENT;
@@ -1165,8 +1167,8 @@ ssize_t aa_remove_profiles(char *fqname, size_t size)
                }
                name = profile->base.hname;
                __remove_profile(profile);
+               write_unlock(&ns->lock);
        }
-       write_unlock(&ns->lock);
 
        /* don't fail removal if audit fails */
        (void) audit_policy(OP_PROF_RM, GFP_KERNEL, name, info, error);