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TOMOYO Linux Cross Reference
Linux/security/apparmor/resource.c

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  1 /*
  2  * AppArmor security module
  3  *
  4  * This file contains AppArmor resource mediation and attachment
  5  *
  6  * Copyright (C) 1998-2008 Novell/SUSE
  7  * Copyright 2009-2010 Canonical Ltd.
  8  *
  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
 12  * License.
 13  */
 14 
 15 #include <linux/audit.h>
 16 
 17 #include "include/audit.h"
 18 #include "include/context.h"
 19 #include "include/resource.h"
 20 #include "include/policy.h"
 21 
 22 /*
 23  * Table of rlimit names: we generate it from resource.h.
 24  */
 25 #include "rlim_names.h"
 26 
 27 struct aa_fs_entry aa_fs_entry_rlimit[] = {
 28         AA_FS_FILE_STRING("mask", AA_FS_RLIMIT_MASK),
 29         { }
 30 };
 31 
 32 /* audit callback for resource specific fields */
 33 static void audit_cb(struct audit_buffer *ab, void *va)
 34 {
 35         struct common_audit_data *sa = va;
 36 
 37         audit_log_format(ab, " rlimit=%s value=%lu",
 38                          rlim_names[sa->aad->rlim.rlim], sa->aad->rlim.max);
 39 }
 40 
 41 /**
 42  * audit_resource - audit setting resource limit
 43  * @profile: profile being enforced  (NOT NULL)
 44  * @resoure: rlimit being auditing
 45  * @value: value being set
 46  * @error: error value
 47  *
 48  * Returns: 0 or sa->error else other error code on failure
 49  */
 50 static int audit_resource(struct aa_profile *profile, unsigned int resource,
 51                           unsigned long value, int error)
 52 {
 53         struct common_audit_data sa;
 54         struct apparmor_audit_data aad = {0,};
 55 
 56         sa.type = LSM_AUDIT_DATA_NONE;
 57         sa.aad = &aad;
 58         aad.op = OP_SETRLIMIT,
 59         aad.rlim.rlim = resource;
 60         aad.rlim.max = value;
 61         aad.error = error;
 62         return aa_audit(AUDIT_APPARMOR_AUTO, profile, GFP_KERNEL, &sa,
 63                         audit_cb);
 64 }
 65 
 66 /**
 67  * aa_map_resouce - map compiled policy resource to internal #
 68  * @resource: flattened policy resource number
 69  *
 70  * Returns: resource # for the current architecture.
 71  *
 72  * rlimit resource can vary based on architecture, map the compiled policy
 73  * resource # to the internal representation for the architecture.
 74  */
 75 int aa_map_resource(int resource)
 76 {
 77         return rlim_map[resource];
 78 }
 79 
 80 /**
 81  * aa_task_setrlimit - test permission to set an rlimit
 82  * @profile - profile confining the task  (NOT NULL)
 83  * @task - task the resource is being set on
 84  * @resource - the resource being set
 85  * @new_rlim - the new resource limit  (NOT NULL)
 86  *
 87  * Control raising the processes hard limit.
 88  *
 89  * Returns: 0 or error code if setting resource failed
 90  */
 91 int aa_task_setrlimit(struct aa_profile *profile, struct task_struct *task,
 92                       unsigned int resource, struct rlimit *new_rlim)
 93 {
 94         struct aa_profile *task_profile;
 95         int error = 0;
 96 
 97         rcu_read_lock();
 98         task_profile = aa_get_profile(aa_cred_profile(__task_cred(task)));
 99         rcu_read_unlock();
100 
101         /* TODO: extend resource control to handle other (non current)
102          * profiles.  AppArmor rules currently have the implicit assumption
103          * that the task is setting the resource of a task confined with
104          * the same profile.
105          */
106         if (profile != task_profile ||
107             (profile->rlimits.mask & (1 << resource) &&
108              new_rlim->rlim_max > profile->rlimits.limits[resource].rlim_max))
109                 error = -EACCES;
110 
111         aa_put_profile(task_profile);
112 
113         return audit_resource(profile, resource, new_rlim->rlim_max, error);
114 }
115 
116 /**
117  * __aa_transition_rlimits - apply new profile rlimits
118  * @old: old profile on task  (NOT NULL)
119  * @new: new profile with rlimits to apply  (NOT NULL)
120  */
121 void __aa_transition_rlimits(struct aa_profile *old, struct aa_profile *new)
122 {
123         unsigned int mask = 0;
124         struct rlimit *rlim, *initrlim;
125         int i;
126 
127         /* for any rlimits the profile controlled reset the soft limit
128          * to the less of the tasks hard limit and the init tasks soft limit
129          */
130         if (old->rlimits.mask) {
131                 for (i = 0, mask = 1; i < RLIM_NLIMITS; i++, mask <<= 1) {
132                         if (old->rlimits.mask & mask) {
133                                 rlim = current->signal->rlim + i;
134                                 initrlim = init_task.signal->rlim + i;
135                                 rlim->rlim_cur = min(rlim->rlim_max,
136                                                      initrlim->rlim_cur);
137                         }
138                 }
139         }
140 
141         /* set any new hard limits as dictated by the new profile */
142         if (!new->rlimits.mask)
143                 return;
144         for (i = 0, mask = 1; i < RLIM_NLIMITS; i++, mask <<= 1) {
145                 if (!(new->rlimits.mask & mask))
146                         continue;
147 
148                 rlim = current->signal->rlim + i;
149                 rlim->rlim_max = min(rlim->rlim_max,
150                                      new->rlimits.limits[i].rlim_max);
151                 /* soft limit should not exceed hard limit */
152                 rlim->rlim_cur = min(rlim->rlim_cur, rlim->rlim_max);
153         }
154 }
155 

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