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15#include <linux/audit.h>
16#include <linux/security.h>
17
18#include "include/audit.h"
19#include "include/cred.h"
20#include "include/resource.h"
21#include "include/policy.h"
22
23
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25
26#include "rlim_names.h"
27
28struct aa_sfs_entry aa_sfs_entry_rlimit[] = {
29 AA_SFS_FILE_STRING("mask", AA_SFS_RLIMIT_MASK),
30 { }
31};
32
33
34static void audit_cb(struct audit_buffer *ab, void *va)
35{
36 struct common_audit_data *sa = va;
37
38 audit_log_format(ab, " rlimit=%s value=%lu",
39 rlim_names[aad(sa)->rlim.rlim], aad(sa)->rlim.max);
40 if (aad(sa)->peer) {
41 audit_log_format(ab, " peer=");
42 aa_label_xaudit(ab, labels_ns(aad(sa)->label), aad(sa)->peer,
43 FLAGS_NONE, GFP_ATOMIC);
44 }
45}
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55
56static int audit_resource(struct aa_profile *profile, unsigned int resource,
57 unsigned long value, struct aa_label *peer,
58 const char *info, int error)
59{
60 DEFINE_AUDIT_DATA(sa, LSM_AUDIT_DATA_NONE, OP_SETRLIMIT);
61
62 aad(&sa)->rlim.rlim = resource;
63 aad(&sa)->rlim.max = value;
64 aad(&sa)->peer = peer;
65 aad(&sa)->info = info;
66 aad(&sa)->error = error;
67
68 return aa_audit(AUDIT_APPARMOR_AUTO, profile, &sa, audit_cb);
69}
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79
80int aa_map_resource(int resource)
81{
82 return rlim_map[resource];
83}
84
85static int profile_setrlimit(struct aa_profile *profile, unsigned int resource,
86 struct rlimit *new_rlim)
87{
88 int e = 0;
89
90 if (profile->rlimits.mask & (1 << resource) && new_rlim->rlim_max >
91 profile->rlimits.limits[resource].rlim_max)
92 e = -EACCES;
93 return audit_resource(profile, resource, new_rlim->rlim_max, NULL, NULL,
94 e);
95}
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107
108int aa_task_setrlimit(struct aa_label *label, struct task_struct *task,
109 unsigned int resource, struct rlimit *new_rlim)
110{
111 struct aa_profile *profile;
112 struct aa_label *peer;
113 int error = 0;
114
115 rcu_read_lock();
116 peer = aa_get_newest_cred_label(__task_cred(task));
117 rcu_read_unlock();
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125
126 if (label != peer &&
127 !aa_capable(label, CAP_SYS_RESOURCE, SECURITY_CAP_NOAUDIT))
128 error = fn_for_each(label, profile,
129 audit_resource(profile, resource,
130 new_rlim->rlim_max, peer,
131 "cap_sys_resource", -EACCES));
132 else
133 error = fn_for_each_confined(label, profile,
134 profile_setrlimit(profile, resource, new_rlim));
135 aa_put_label(peer);
136
137 return error;
138}
139
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143
144
145void __aa_transition_rlimits(struct aa_label *old_l, struct aa_label *new_l)
146{
147 unsigned int mask = 0;
148 struct rlimit *rlim, *initrlim;
149 struct aa_profile *old, *new;
150 struct label_it i;
151
152 old = labels_profile(old_l);
153 new = labels_profile(new_l);
154
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158 label_for_each_confined(i, old_l, old) {
159 if (old->rlimits.mask) {
160 int j;
161
162 for (j = 0, mask = 1; j < RLIM_NLIMITS; j++,
163 mask <<= 1) {
164 if (old->rlimits.mask & mask) {
165 rlim = current->signal->rlim + j;
166 initrlim = init_task.signal->rlim + j;
167 rlim->rlim_cur = min(rlim->rlim_max,
168 initrlim->rlim_cur);
169 }
170 }
171 }
172 }
173
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175 label_for_each_confined(i, new_l, new) {
176 int j;
177
178 if (!new->rlimits.mask)
179 continue;
180 for (j = 0, mask = 1; j < RLIM_NLIMITS; j++, mask <<= 1) {
181 if (!(new->rlimits.mask & mask))
182 continue;
183
184 rlim = current->signal->rlim + j;
185 rlim->rlim_max = min(rlim->rlim_max,
186 new->rlimits.limits[j].rlim_max);
187
188 rlim->rlim_cur = min(rlim->rlim_cur, rlim->rlim_max);
189 }
190 }
191}
192