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-rw-r--r--security/apparmor/policy.c61
1 files changed, 44 insertions, 17 deletions
diff --git a/security/apparmor/policy.c b/security/apparmor/policy.c
index 705c2879d3a9..179e68d7dc5f 100644
--- a/security/apparmor/policy.c
+++ b/security/apparmor/policy.c
@@ -766,7 +766,9 @@ struct aa_profile *aa_find_child(struct aa_profile *parent, const char *name)
struct aa_profile *profile;
rcu_read_lock();
- profile = aa_get_profile(__find_child(&parent->base.profiles, name));
+ do {
+ profile = __find_child(&parent->base.profiles, name);
+ } while (profile && !aa_get_profile_not0(profile));
rcu_read_unlock();
/* refcount released by caller */
@@ -916,6 +918,22 @@ static int audit_policy(int op, gfp_t gfp, const char *name, const char *info,
&sa, NULL);
}
+bool policy_view_capable(void)
+{
+ struct user_namespace *user_ns = current_user_ns();
+ bool response = false;
+
+ if (ns_capable(user_ns, CAP_MAC_ADMIN))
+ response = true;
+
+ return response;
+}
+
+bool policy_admin_capable(void)
+{
+ return policy_view_capable() && !aa_g_lock_policy;
+}
+
/**
* aa_may_manage_policy - can the current task manage policy
* @op: the policy manipulation operation being done
@@ -930,7 +948,7 @@ bool aa_may_manage_policy(int op)
return 0;
}
- if (!capable(CAP_MAC_ADMIN)) {
+ if (!policy_admin_capable()) {
audit_policy(op, GFP_KERNEL, NULL, "not policy admin", -EACCES);
return 0;
}
@@ -1067,7 +1085,7 @@ static int __lookup_replace(struct aa_namespace *ns, const char *hname,
*/
ssize_t aa_replace_profiles(void *udata, size_t size, bool noreplace)
{
- const char *ns_name, *name = NULL, *info = NULL;
+ const char *ns_name, *info = NULL;
struct aa_namespace *ns = NULL;
struct aa_load_ent *ent, *tmp;
int op = OP_PROF_REPL;
@@ -1082,18 +1100,15 @@ ssize_t aa_replace_profiles(void *udata, size_t size, bool noreplace)
/* released below */
ns = aa_prepare_namespace(ns_name);
if (!ns) {
- info = "failed to prepare namespace";
- error = -ENOMEM;
- name = ns_name;
- goto fail;
+ error = audit_policy(op, GFP_KERNEL, ns_name,
+ "failed to prepare namespace", -ENOMEM);
+ goto free;
}
mutex_lock(&ns->lock);
/* setup parent and ns info */
list_for_each_entry(ent, &lh, list) {
struct aa_policy *policy;
-
- name = ent->new->base.hname;
error = __lookup_replace(ns, ent->new->base.hname, noreplace,
&ent->old, &info);
if (error)
@@ -1121,7 +1136,6 @@ ssize_t aa_replace_profiles(void *udata, size_t size, bool noreplace)
if (!p) {
error = -ENOENT;
info = "parent does not exist";
- name = ent->new->base.hname;
goto fail_lock;
}
rcu_assign_pointer(ent->new->parent, aa_get_profile(p));
@@ -1163,7 +1177,7 @@ ssize_t aa_replace_profiles(void *udata, size_t size, bool noreplace)
list_del_init(&ent->list);
op = (!ent->old && !ent->rename) ? OP_PROF_LOAD : OP_PROF_REPL;
- audit_policy(op, GFP_ATOMIC, ent->new->base.name, NULL, error);
+ audit_policy(op, GFP_ATOMIC, ent->new->base.hname, NULL, error);
if (ent->old) {
__replace_profile(ent->old, ent->new, 1);
@@ -1187,14 +1201,14 @@ ssize_t aa_replace_profiles(void *udata, size_t size, bool noreplace)
/* parent replaced in this atomic set? */
if (newest != parent) {
aa_get_profile(newest);
- aa_put_profile(parent);
rcu_assign_pointer(ent->new->parent, newest);
- } else
- aa_put_profile(newest);
+ aa_put_profile(parent);
+ }
/* aafs interface uses replacedby */
rcu_assign_pointer(ent->new->replacedby->profile,
aa_get_profile(ent->new));
- __list_add_profile(&parent->base.profiles, ent->new);
+ __list_add_profile(&newest->base.profiles, ent->new);
+ aa_put_profile(newest);
} else {
/* aafs interface uses replacedby */
rcu_assign_pointer(ent->new->replacedby->profile,
@@ -1214,9 +1228,22 @@ out:
fail_lock:
mutex_unlock(&ns->lock);
-fail:
- error = audit_policy(op, GFP_KERNEL, name, info, error);
+ /* audit cause of failure */
+ op = (!ent->old) ? OP_PROF_LOAD : OP_PROF_REPL;
+ audit_policy(op, GFP_KERNEL, ent->new->base.hname, info, error);
+ /* audit status that rest of profiles in the atomic set failed too */
+ info = "valid profile in failed atomic policy load";
+ list_for_each_entry(tmp, &lh, list) {
+ if (tmp == ent) {
+ info = "unchecked profile in failed atomic policy load";
+ /* skip entry that caused failure */
+ continue;
+ }
+ op = (!ent->old) ? OP_PROF_LOAD : OP_PROF_REPL;
+ audit_policy(op, GFP_KERNEL, tmp->new->base.hname, info, error);
+ }
+free:
list_for_each_entry_safe(ent, tmp, &lh, list) {
list_del_init(&ent->list);
aa_load_ent_free(ent);