v4.19.13 snapshot.
diff --git a/security/apparmor/resource.c b/security/apparmor/resource.c
new file mode 100644
index 0000000..95fd26d
--- /dev/null
+++ b/security/apparmor/resource.c
@@ -0,0 +1,191 @@
+/*
+ * AppArmor security module
+ *
+ * This file contains AppArmor resource mediation and attachment
+ *
+ * Copyright (C) 1998-2008 Novell/SUSE
+ * Copyright 2009-2010 Canonical Ltd.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation, version 2 of the
+ * License.
+ */
+
+#include <linux/audit.h>
+#include <linux/security.h>
+
+#include "include/audit.h"
+#include "include/cred.h"
+#include "include/resource.h"
+#include "include/policy.h"
+
+/*
+ * Table of rlimit names: we generate it from resource.h.
+ */
+#include "rlim_names.h"
+
+struct aa_sfs_entry aa_sfs_entry_rlimit[] = {
+ AA_SFS_FILE_STRING("mask", AA_SFS_RLIMIT_MASK),
+ { }
+};
+
+/* audit callback for resource specific fields */
+static void audit_cb(struct audit_buffer *ab, void *va)
+{
+ struct common_audit_data *sa = va;
+
+ audit_log_format(ab, " rlimit=%s value=%lu",
+ rlim_names[aad(sa)->rlim.rlim], aad(sa)->rlim.max);
+ if (aad(sa)->peer) {
+ audit_log_format(ab, " peer=");
+ aa_label_xaudit(ab, labels_ns(aad(sa)->label), aad(sa)->peer,
+ FLAGS_NONE, GFP_ATOMIC);
+ }
+}
+
+/**
+ * audit_resource - audit setting resource limit
+ * @profile: profile being enforced (NOT NULL)
+ * @resource: rlimit being auditing
+ * @value: value being set
+ * @error: error value
+ *
+ * Returns: 0 or sa->error else other error code on failure
+ */
+static int audit_resource(struct aa_profile *profile, unsigned int resource,
+ unsigned long value, struct aa_label *peer,
+ const char *info, int error)
+{
+ DEFINE_AUDIT_DATA(sa, LSM_AUDIT_DATA_NONE, OP_SETRLIMIT);
+
+ aad(&sa)->rlim.rlim = resource;
+ aad(&sa)->rlim.max = value;
+ aad(&sa)->peer = peer;
+ aad(&sa)->info = info;
+ aad(&sa)->error = error;
+
+ return aa_audit(AUDIT_APPARMOR_AUTO, profile, &sa, audit_cb);
+}
+
+/**
+ * aa_map_resouce - map compiled policy resource to internal #
+ * @resource: flattened policy resource number
+ *
+ * Returns: resource # for the current architecture.
+ *
+ * rlimit resource can vary based on architecture, map the compiled policy
+ * resource # to the internal representation for the architecture.
+ */
+int aa_map_resource(int resource)
+{
+ return rlim_map[resource];
+}
+
+static int profile_setrlimit(struct aa_profile *profile, unsigned int resource,
+ struct rlimit *new_rlim)
+{
+ int e = 0;
+
+ if (profile->rlimits.mask & (1 << resource) && new_rlim->rlim_max >
+ profile->rlimits.limits[resource].rlim_max)
+ e = -EACCES;
+ return audit_resource(profile, resource, new_rlim->rlim_max, NULL, NULL,
+ e);
+}
+
+/**
+ * aa_task_setrlimit - test permission to set an rlimit
+ * @label - label confining the task (NOT NULL)
+ * @task - task the resource is being set on
+ * @resource - the resource being set
+ * @new_rlim - the new resource limit (NOT NULL)
+ *
+ * Control raising the processes hard limit.
+ *
+ * Returns: 0 or error code if setting resource failed
+ */
+int aa_task_setrlimit(struct aa_label *label, struct task_struct *task,
+ unsigned int resource, struct rlimit *new_rlim)
+{
+ struct aa_profile *profile;
+ struct aa_label *peer;
+ int error = 0;
+
+ rcu_read_lock();
+ peer = aa_get_newest_cred_label(__task_cred(task));
+ rcu_read_unlock();
+
+ /* TODO: extend resource control to handle other (non current)
+ * profiles. AppArmor rules currently have the implicit assumption
+ * that the task is setting the resource of a task confined with
+ * the same profile or that the task setting the resource of another
+ * task has CAP_SYS_RESOURCE.
+ */
+
+ if (label != peer &&
+ aa_capable(label, CAP_SYS_RESOURCE, SECURITY_CAP_NOAUDIT) != 0)
+ error = fn_for_each(label, profile,
+ audit_resource(profile, resource,
+ new_rlim->rlim_max, peer,
+ "cap_sys_resource", -EACCES));
+ else
+ error = fn_for_each_confined(label, profile,
+ profile_setrlimit(profile, resource, new_rlim));
+ aa_put_label(peer);
+
+ return error;
+}
+
+/**
+ * __aa_transition_rlimits - apply new profile rlimits
+ * @old_l: old label on task (NOT NULL)
+ * @new_l: new label with rlimits to apply (NOT NULL)
+ */
+void __aa_transition_rlimits(struct aa_label *old_l, struct aa_label *new_l)
+{
+ unsigned int mask = 0;
+ struct rlimit *rlim, *initrlim;
+ struct aa_profile *old, *new;
+ struct label_it i;
+
+ old = labels_profile(old_l);
+ new = labels_profile(new_l);
+
+ /* for any rlimits the profile controlled, reset the soft limit
+ * to the lesser of the tasks hard limit and the init tasks soft limit
+ */
+ label_for_each_confined(i, old_l, old) {
+ if (old->rlimits.mask) {
+ int j;
+
+ for (j = 0, mask = 1; j < RLIM_NLIMITS; j++,
+ mask <<= 1) {
+ if (old->rlimits.mask & mask) {
+ rlim = current->signal->rlim + j;
+ initrlim = init_task.signal->rlim + j;
+ rlim->rlim_cur = min(rlim->rlim_max,
+ initrlim->rlim_cur);
+ }
+ }
+ }
+ }
+
+ /* set any new hard limits as dictated by the new profile */
+ label_for_each_confined(i, new_l, new) {
+ int j;
+
+ if (!new->rlimits.mask)
+ continue;
+ for (j = 0, mask = 1; j < RLIM_NLIMITS; j++, mask <<= 1) {
+ if (!(new->rlimits.mask & mask))
+ continue;
+
+ rlim = current->signal->rlim + j;
+ rlim->rlim_max = min(rlim->rlim_max,
+ new->rlimits.limits[j].rlim_max);
+ /* soft limit should not exceed hard limit */
+ rlim->rlim_cur = min(rlim->rlim_cur, rlim->rlim_max);
+ }
+ }
+}