2 * AppArmor security module
4 * This file contains AppArmor resource mediation and attachment
6 * Copyright (C) 1998-2008 Novell/SUSE
7 * Copyright 2009-2010 Canonical Ltd.
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License as
11 * published by the Free Software Foundation, version 2 of the
15 #include <linux/audit.h>
17 #include "include/audit.h"
18 #include "include/resource.h"
19 #include "include/policy.h"
22 * Table of rlimit names: we generate it from resource.h.
24 #include "rlim_names.h"
26 struct aa_fs_entry aa_fs_entry_rlimit[] = {
27 AA_FS_FILE_STRING("mask", AA_FS_RLIMIT_MASK),
31 /* audit callback for resource specific fields */
32 static void audit_cb(struct audit_buffer *ab, void *va)
34 struct common_audit_data *sa = va;
36 audit_log_format(ab, " rlimit=%s value=%lu",
37 rlim_names[sa->aad.rlim.rlim], sa->aad.rlim.max);
41 * audit_resource - audit setting resource limit
42 * @profile: profile being enforced (NOT NULL)
43 * @resoure: rlimit being auditing
44 * @value: value being set
47 * Returns: 0 or sa->error else other error code on failure
49 static int audit_resource(struct aa_profile *profile, unsigned int resource,
50 unsigned long value, int error)
52 struct common_audit_data sa;
54 COMMON_AUDIT_DATA_INIT(&sa, NONE);
55 sa.aad.op = OP_SETRLIMIT,
56 sa.aad.rlim.rlim = resource;
57 sa.aad.rlim.max = value;
59 return aa_audit(AUDIT_APPARMOR_AUTO, profile, GFP_KERNEL, &sa,
64 * aa_map_resouce - map compiled policy resource to internal #
65 * @resource: flattened policy resource number
67 * Returns: resource # for the current architecture.
69 * rlimit resource can vary based on architecture, map the compiled policy
70 * resource # to the internal representation for the architecture.
72 int aa_map_resource(int resource)
74 return rlim_map[resource];
78 * aa_task_setrlimit - test permission to set an rlimit
79 * @profile - profile confining the task (NOT NULL)
80 * @task - task the resource is being set on
81 * @resource - the resource being set
82 * @new_rlim - the new resource limit (NOT NULL)
84 * Control raising the processes hard limit.
86 * Returns: 0 or error code if setting resource failed
88 int aa_task_setrlimit(struct aa_profile *profile, struct task_struct *task,
89 unsigned int resource, struct rlimit *new_rlim)
93 /* TODO: extend resource control to handle other (non current)
94 * processes. AppArmor rules currently have the implicit assumption
95 * that the task is setting the resource of the current process
97 if ((task != current->group_leader) ||
98 (profile->rlimits.mask & (1 << resource) &&
99 new_rlim->rlim_max > profile->rlimits.limits[resource].rlim_max))
102 return audit_resource(profile, resource, new_rlim->rlim_max, error);
106 * __aa_transition_rlimits - apply new profile rlimits
107 * @old: old profile on task (NOT NULL)
108 * @new: new profile with rlimits to apply (NOT NULL)
110 void __aa_transition_rlimits(struct aa_profile *old, struct aa_profile *new)
112 unsigned int mask = 0;
113 struct rlimit *rlim, *initrlim;
116 /* for any rlimits the profile controlled reset the soft limit
117 * to the less of the tasks hard limit and the init tasks soft limit
119 if (old->rlimits.mask) {
120 for (i = 0, mask = 1; i < RLIM_NLIMITS; i++, mask <<= 1) {
121 if (old->rlimits.mask & mask) {
122 rlim = current->signal->rlim + i;
123 initrlim = init_task.signal->rlim + i;
124 rlim->rlim_cur = min(rlim->rlim_max,
130 /* set any new hard limits as dictated by the new profile */
131 if (!new->rlimits.mask)
133 for (i = 0, mask = 1; i < RLIM_NLIMITS; i++, mask <<= 1) {
134 if (!(new->rlimits.mask & mask))
137 rlim = current->signal->rlim + i;
138 rlim->rlim_max = min(rlim->rlim_max,
139 new->rlimits.limits[i].rlim_max);
140 /* soft limit should not exceed hard limit */
141 rlim->rlim_cur = min(rlim->rlim_cur, rlim->rlim_max);