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Linux/security/apparmor/resource.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /*
  3  * AppArmor security module
  4  *
  5  * This file contains AppArmor resource mediation and attachment
  6  *
  7  * Copyright (C) 1998-2008 Novell/SUSE
  8  * Copyright 2009-2010 Canonical Ltd.
  9  */
 10 
 11 #include <linux/audit.h>
 12 #include <linux/security.h>
 13 
 14 #include "include/audit.h"
 15 #include "include/cred.h"
 16 #include "include/resource.h"
 17 #include "include/policy.h"
 18 
 19 /*
 20  * Table of rlimit names: we generate it from resource.h.
 21  */
 22 #include "rlim_names.h"
 23 
 24 struct aa_sfs_entry aa_sfs_entry_rlimit[] = {
 25         AA_SFS_FILE_STRING("mask", AA_SFS_RLIMIT_MASK),
 26         { }
 27 };
 28 
 29 /* audit callback for resource specific fields */
 30 static void audit_cb(struct audit_buffer *ab, void *va)
 31 {
 32         struct common_audit_data *sa = va;
 33 
 34         audit_log_format(ab, " rlimit=%s value=%lu",
 35                          rlim_names[aad(sa)->rlim.rlim], aad(sa)->rlim.max);
 36         if (aad(sa)->peer) {
 37                 audit_log_format(ab, " peer=");
 38                 aa_label_xaudit(ab, labels_ns(aad(sa)->label), aad(sa)->peer,
 39                                 FLAGS_NONE, GFP_ATOMIC);
 40         }
 41 }
 42 
 43 /**
 44  * audit_resource - audit setting resource limit
 45  * @profile: profile being enforced  (NOT NULL)
 46  * @resource: rlimit being auditing
 47  * @value: value being set
 48  * @error: error value
 49  *
 50  * Returns: 0 or sa->error else other error code on failure
 51  */
 52 static int audit_resource(struct aa_profile *profile, unsigned int resource,
 53                           unsigned long value, struct aa_label *peer,
 54                           const char *info, int error)
 55 {
 56         DEFINE_AUDIT_DATA(sa, LSM_AUDIT_DATA_NONE, OP_SETRLIMIT);
 57 
 58         aad(&sa)->rlim.rlim = resource;
 59         aad(&sa)->rlim.max = value;
 60         aad(&sa)->peer = peer;
 61         aad(&sa)->info = info;
 62         aad(&sa)->error = error;
 63 
 64         return aa_audit(AUDIT_APPARMOR_AUTO, profile, &sa, audit_cb);
 65 }
 66 
 67 /**
 68  * aa_map_resouce - map compiled policy resource to internal #
 69  * @resource: flattened policy resource number
 70  *
 71  * Returns: resource # for the current architecture.
 72  *
 73  * rlimit resource can vary based on architecture, map the compiled policy
 74  * resource # to the internal representation for the architecture.
 75  */
 76 int aa_map_resource(int resource)
 77 {
 78         return rlim_map[resource];
 79 }
 80 
 81 static int profile_setrlimit(struct aa_profile *profile, unsigned int resource,
 82                              struct rlimit *new_rlim)
 83 {
 84         int e = 0;
 85 
 86         if (profile->rlimits.mask & (1 << resource) && new_rlim->rlim_max >
 87             profile->rlimits.limits[resource].rlim_max)
 88                 e = -EACCES;
 89         return audit_resource(profile, resource, new_rlim->rlim_max, NULL, NULL,
 90                               e);
 91 }
 92 
 93 /**
 94  * aa_task_setrlimit - test permission to set an rlimit
 95  * @label - label confining the task  (NOT NULL)
 96  * @task - task the resource is being set on
 97  * @resource - the resource being set
 98  * @new_rlim - the new resource limit  (NOT NULL)
 99  *
100  * Control raising the processes hard limit.
101  *
102  * Returns: 0 or error code if setting resource failed
103  */
104 int aa_task_setrlimit(struct aa_label *label, struct task_struct *task,
105                       unsigned int resource, struct rlimit *new_rlim)
106 {
107         struct aa_profile *profile;
108         struct aa_label *peer;
109         int error = 0;
110 
111         rcu_read_lock();
112         peer = aa_get_newest_cred_label(__task_cred(task));
113         rcu_read_unlock();
114 
115         /* TODO: extend resource control to handle other (non current)
116          * profiles.  AppArmor rules currently have the implicit assumption
117          * that the task is setting the resource of a task confined with
118          * the same profile or that the task setting the resource of another
119          * task has CAP_SYS_RESOURCE.
120          */
121 
122         if (label != peer &&
123             aa_capable(label, CAP_SYS_RESOURCE, CAP_OPT_NOAUDIT) != 0)
124                 error = fn_for_each(label, profile,
125                                 audit_resource(profile, resource,
126                                                new_rlim->rlim_max, peer,
127                                                "cap_sys_resource", -EACCES));
128         else
129                 error = fn_for_each_confined(label, profile,
130                                 profile_setrlimit(profile, resource, new_rlim));
131         aa_put_label(peer);
132 
133         return error;
134 }
135 
136 /**
137  * __aa_transition_rlimits - apply new profile rlimits
138  * @old_l: old label on task  (NOT NULL)
139  * @new_l: new label with rlimits to apply  (NOT NULL)
140  */
141 void __aa_transition_rlimits(struct aa_label *old_l, struct aa_label *new_l)
142 {
143         unsigned int mask = 0;
144         struct rlimit *rlim, *initrlim;
145         struct aa_profile *old, *new;
146         struct label_it i;
147 
148         old = labels_profile(old_l);
149         new = labels_profile(new_l);
150 
151         /* for any rlimits the profile controlled, reset the soft limit
152          * to the lesser of the tasks hard limit and the init tasks soft limit
153          */
154         label_for_each_confined(i, old_l, old) {
155                 if (old->rlimits.mask) {
156                         int j;
157 
158                         for (j = 0, mask = 1; j < RLIM_NLIMITS; j++,
159                                      mask <<= 1) {
160                                 if (old->rlimits.mask & mask) {
161                                         rlim = current->signal->rlim + j;
162                                         initrlim = init_task.signal->rlim + j;
163                                         rlim->rlim_cur = min(rlim->rlim_max,
164                                                             initrlim->rlim_cur);
165                                 }
166                         }
167                 }
168         }
169 
170         /* set any new hard limits as dictated by the new profile */
171         label_for_each_confined(i, new_l, new) {
172                 int j;
173 
174                 if (!new->rlimits.mask)
175                         continue;
176                 for (j = 0, mask = 1; j < RLIM_NLIMITS; j++, mask <<= 1) {
177                         if (!(new->rlimits.mask & mask))
178                                 continue;
179 
180                         rlim = current->signal->rlim + j;
181                         rlim->rlim_max = min(rlim->rlim_max,
182                                              new->rlimits.limits[j].rlim_max);
183                         /* soft limit should not exceed hard limit */
184                         rlim->rlim_cur = min(rlim->rlim_cur, rlim->rlim_max);
185                 }
186         }
187 }
188 

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