This source file includes following definitions.
- audit_ptrace_mask
- audit_ptrace_cb
- profile_ptrace_perm
- profile_tracee_perm
- profile_tracer_perm
- aa_may_ptrace
- map_signal_num
- audit_signal_mask
- audit_signal_cb
- profile_signal_perm
- aa_may_signal
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11 #include <linux/gfp.h>
12 #include <linux/ptrace.h>
13
14 #include "include/audit.h"
15 #include "include/capability.h"
16 #include "include/cred.h"
17 #include "include/policy.h"
18 #include "include/ipc.h"
19 #include "include/sig_names.h"
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25
26 static void audit_ptrace_mask(struct audit_buffer *ab, u32 mask)
27 {
28 switch (mask) {
29 case MAY_READ:
30 audit_log_string(ab, "read");
31 break;
32 case MAY_WRITE:
33 audit_log_string(ab, "trace");
34 break;
35 case AA_MAY_BE_READ:
36 audit_log_string(ab, "readby");
37 break;
38 case AA_MAY_BE_TRACED:
39 audit_log_string(ab, "tracedby");
40 break;
41 }
42 }
43
44
45 static void audit_ptrace_cb(struct audit_buffer *ab, void *va)
46 {
47 struct common_audit_data *sa = va;
48
49 if (aad(sa)->request & AA_PTRACE_PERM_MASK) {
50 audit_log_format(ab, " requested_mask=");
51 audit_ptrace_mask(ab, aad(sa)->request);
52
53 if (aad(sa)->denied & AA_PTRACE_PERM_MASK) {
54 audit_log_format(ab, " denied_mask=");
55 audit_ptrace_mask(ab, aad(sa)->denied);
56 }
57 }
58 audit_log_format(ab, " peer=");
59 aa_label_xaudit(ab, labels_ns(aad(sa)->label), aad(sa)->peer,
60 FLAGS_NONE, GFP_ATOMIC);
61 }
62
63
64
65 static int profile_ptrace_perm(struct aa_profile *profile,
66 struct aa_label *peer, u32 request,
67 struct common_audit_data *sa)
68 {
69 struct aa_perms perms = { };
70
71 aad(sa)->peer = peer;
72 aa_profile_match_label(profile, peer, AA_CLASS_PTRACE, request,
73 &perms);
74 aa_apply_modes_to_perms(profile, &perms);
75 return aa_check_perms(profile, &perms, request, sa, audit_ptrace_cb);
76 }
77
78 static int profile_tracee_perm(struct aa_profile *tracee,
79 struct aa_label *tracer, u32 request,
80 struct common_audit_data *sa)
81 {
82 if (profile_unconfined(tracee) || unconfined(tracer) ||
83 !PROFILE_MEDIATES(tracee, AA_CLASS_PTRACE))
84 return 0;
85
86 return profile_ptrace_perm(tracee, tracer, request, sa);
87 }
88
89 static int profile_tracer_perm(struct aa_profile *tracer,
90 struct aa_label *tracee, u32 request,
91 struct common_audit_data *sa)
92 {
93 if (profile_unconfined(tracer))
94 return 0;
95
96 if (PROFILE_MEDIATES(tracer, AA_CLASS_PTRACE))
97 return profile_ptrace_perm(tracer, tracee, request, sa);
98
99
100 if (&tracer->label == tracee)
101 return 0;
102
103 aad(sa)->label = &tracer->label;
104 aad(sa)->peer = tracee;
105 aad(sa)->request = 0;
106 aad(sa)->error = aa_capable(&tracer->label, CAP_SYS_PTRACE,
107 CAP_OPT_NONE);
108
109 return aa_audit(AUDIT_APPARMOR_AUTO, tracer, sa, audit_ptrace_cb);
110 }
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119
120 int aa_may_ptrace(struct aa_label *tracer, struct aa_label *tracee,
121 u32 request)
122 {
123 struct aa_profile *profile;
124 u32 xrequest = request << PTRACE_PERM_SHIFT;
125 DEFINE_AUDIT_DATA(sa, LSM_AUDIT_DATA_NONE, OP_PTRACE);
126
127 return xcheck_labels(tracer, tracee, profile,
128 profile_tracer_perm(profile, tracee, request, &sa),
129 profile_tracee_perm(profile, tracer, xrequest, &sa));
130 }
131
132
133 static inline int map_signal_num(int sig)
134 {
135 if (sig > SIGRTMAX)
136 return SIGUNKNOWN;
137 else if (sig >= SIGRTMIN)
138 return sig - SIGRTMIN + SIGRT_BASE;
139 else if (sig < MAXMAPPED_SIG)
140 return sig_map[sig];
141 return SIGUNKNOWN;
142 }
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149 static void audit_signal_mask(struct audit_buffer *ab, u32 mask)
150 {
151 if (mask & MAY_READ)
152 audit_log_string(ab, "receive");
153 if (mask & MAY_WRITE)
154 audit_log_string(ab, "send");
155 }
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161
162 static void audit_signal_cb(struct audit_buffer *ab, void *va)
163 {
164 struct common_audit_data *sa = va;
165
166 if (aad(sa)->request & AA_SIGNAL_PERM_MASK) {
167 audit_log_format(ab, " requested_mask=");
168 audit_signal_mask(ab, aad(sa)->request);
169 if (aad(sa)->denied & AA_SIGNAL_PERM_MASK) {
170 audit_log_format(ab, " denied_mask=");
171 audit_signal_mask(ab, aad(sa)->denied);
172 }
173 }
174 if (aad(sa)->signal == SIGUNKNOWN)
175 audit_log_format(ab, "signal=unknown(%d)",
176 aad(sa)->unmappedsig);
177 else if (aad(sa)->signal < MAXMAPPED_SIGNAME)
178 audit_log_format(ab, " signal=%s", sig_names[aad(sa)->signal]);
179 else
180 audit_log_format(ab, " signal=rtmin+%d",
181 aad(sa)->signal - SIGRT_BASE);
182 audit_log_format(ab, " peer=");
183 aa_label_xaudit(ab, labels_ns(aad(sa)->label), aad(sa)->peer,
184 FLAGS_NONE, GFP_ATOMIC);
185 }
186
187 static int profile_signal_perm(struct aa_profile *profile,
188 struct aa_label *peer, u32 request,
189 struct common_audit_data *sa)
190 {
191 struct aa_perms perms;
192 unsigned int state;
193
194 if (profile_unconfined(profile) ||
195 !PROFILE_MEDIATES(profile, AA_CLASS_SIGNAL))
196 return 0;
197
198 aad(sa)->peer = peer;
199
200 state = aa_dfa_next(profile->policy.dfa,
201 profile->policy.start[AA_CLASS_SIGNAL],
202 aad(sa)->signal);
203 aa_label_match(profile, peer, state, false, request, &perms);
204 aa_apply_modes_to_perms(profile, &perms);
205 return aa_check_perms(profile, &perms, request, sa, audit_signal_cb);
206 }
207
208 int aa_may_signal(struct aa_label *sender, struct aa_label *target, int sig)
209 {
210 struct aa_profile *profile;
211 DEFINE_AUDIT_DATA(sa, LSM_AUDIT_DATA_NONE, OP_SIGNAL);
212
213 aad(&sa)->signal = map_signal_num(sig);
214 aad(&sa)->unmappedsig = sig;
215 return xcheck_labels(sender, target, profile,
216 profile_signal_perm(profile, target, MAY_WRITE, &sa),
217 profile_signal_perm(profile, sender, MAY_READ, &sa));
218 }