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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * cn_proc.c - process events connector
4 *
5 * Copyright (C) Matt Helsley, IBM Corp. 2005
6 * Based on cn_fork.c by Guillaume Thouvenin <guillaume.thouvenin@bull.net>
7 * Original copyright notice follows:
8 * Copyright (C) 2005 BULL SA.
9 */
10
11#include <linux/kernel.h>
12#include <linux/ktime.h>
13#include <linux/init.h>
14#include <linux/connector.h>
15#include <linux/gfp.h>
16#include <linux/ptrace.h>
17#include <linux/atomic.h>
18#include <linux/pid_namespace.h>
19
20#include <linux/cn_proc.h>
21#include <linux/local_lock.h>
22
23/*
24 * Size of a cn_msg followed by a proc_event structure. Since the
25 * sizeof struct cn_msg is a multiple of 4 bytes, but not 8 bytes, we
26 * add one 4-byte word to the size here, and then start the actual
27 * cn_msg structure 4 bytes into the stack buffer. The result is that
28 * the immediately following proc_event structure is aligned to 8 bytes.
29 */
30#define CN_PROC_MSG_SIZE (sizeof(struct cn_msg) + sizeof(struct proc_event) + 4)
31
32/* See comment above; we test our assumption about sizeof struct cn_msg here. */
33static inline struct cn_msg *buffer_to_cn_msg(__u8 *buffer)
34{
35 BUILD_BUG_ON(sizeof(struct cn_msg) != 20);
36 return (struct cn_msg *)(buffer + 4);
37}
38
39static atomic_t proc_event_num_listeners = ATOMIC_INIT(0);
40static struct cb_id cn_proc_event_id = { CN_IDX_PROC, CN_VAL_PROC };
41
42/* local_event.count is used as the sequence number of the netlink message */
43struct local_event {
44 local_lock_t lock;
45 __u32 count;
46};
47static DEFINE_PER_CPU(struct local_event, local_event) = {
48 .lock = INIT_LOCAL_LOCK(lock),
49};
50
51static inline void send_msg(struct cn_msg *msg)
52{
53 local_lock(&local_event.lock);
54
55 msg->seq = __this_cpu_inc_return(local_event.count) - 1;
56 ((struct proc_event *)msg->data)->cpu = smp_processor_id();
57
58 /*
59 * local_lock() disables preemption during send to ensure the messages
60 * are ordered according to their sequence numbers.
61 *
62 * If cn_netlink_send() fails, the data is not sent.
63 */
64 cn_netlink_send(msg, 0, CN_IDX_PROC, GFP_NOWAIT);
65
66 local_unlock(&local_event.lock);
67}
68
69void proc_fork_connector(struct task_struct *task)
70{
71 struct cn_msg *msg;
72 struct proc_event *ev;
73 __u8 buffer[CN_PROC_MSG_SIZE] __aligned(8);
74 struct task_struct *parent;
75
76 if (atomic_read(&proc_event_num_listeners) < 1)
77 return;
78
79 msg = buffer_to_cn_msg(buffer);
80 ev = (struct proc_event *)msg->data;
81 memset(&ev->event_data, 0, sizeof(ev->event_data));
82 ev->timestamp_ns = ktime_get_ns();
83 ev->what = PROC_EVENT_FORK;
84 rcu_read_lock();
85 parent = rcu_dereference(task->real_parent);
86 ev->event_data.fork.parent_pid = parent->pid;
87 ev->event_data.fork.parent_tgid = parent->tgid;
88 rcu_read_unlock();
89 ev->event_data.fork.child_pid = task->pid;
90 ev->event_data.fork.child_tgid = task->tgid;
91
92 memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
93 msg->ack = 0; /* not used */
94 msg->len = sizeof(*ev);
95 msg->flags = 0; /* not used */
96 send_msg(msg);
97}
98
99void proc_exec_connector(struct task_struct *task)
100{
101 struct cn_msg *msg;
102 struct proc_event *ev;
103 __u8 buffer[CN_PROC_MSG_SIZE] __aligned(8);
104
105 if (atomic_read(&proc_event_num_listeners) < 1)
106 return;
107
108 msg = buffer_to_cn_msg(buffer);
109 ev = (struct proc_event *)msg->data;
110 memset(&ev->event_data, 0, sizeof(ev->event_data));
111 ev->timestamp_ns = ktime_get_ns();
112 ev->what = PROC_EVENT_EXEC;
113 ev->event_data.exec.process_pid = task->pid;
114 ev->event_data.exec.process_tgid = task->tgid;
115
116 memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
117 msg->ack = 0; /* not used */
118 msg->len = sizeof(*ev);
119 msg->flags = 0; /* not used */
120 send_msg(msg);
121}
122
123void proc_id_connector(struct task_struct *task, int which_id)
124{
125 struct cn_msg *msg;
126 struct proc_event *ev;
127 __u8 buffer[CN_PROC_MSG_SIZE] __aligned(8);
128 const struct cred *cred;
129
130 if (atomic_read(&proc_event_num_listeners) < 1)
131 return;
132
133 msg = buffer_to_cn_msg(buffer);
134 ev = (struct proc_event *)msg->data;
135 memset(&ev->event_data, 0, sizeof(ev->event_data));
136 ev->what = which_id;
137 ev->event_data.id.process_pid = task->pid;
138 ev->event_data.id.process_tgid = task->tgid;
139 rcu_read_lock();
140 cred = __task_cred(task);
141 if (which_id == PROC_EVENT_UID) {
142 ev->event_data.id.r.ruid = from_kuid_munged(&init_user_ns, cred->uid);
143 ev->event_data.id.e.euid = from_kuid_munged(&init_user_ns, cred->euid);
144 } else if (which_id == PROC_EVENT_GID) {
145 ev->event_data.id.r.rgid = from_kgid_munged(&init_user_ns, cred->gid);
146 ev->event_data.id.e.egid = from_kgid_munged(&init_user_ns, cred->egid);
147 } else {
148 rcu_read_unlock();
149 return;
150 }
151 rcu_read_unlock();
152 ev->timestamp_ns = ktime_get_ns();
153
154 memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
155 msg->ack = 0; /* not used */
156 msg->len = sizeof(*ev);
157 msg->flags = 0; /* not used */
158 send_msg(msg);
159}
160
161void proc_sid_connector(struct task_struct *task)
162{
163 struct cn_msg *msg;
164 struct proc_event *ev;
165 __u8 buffer[CN_PROC_MSG_SIZE] __aligned(8);
166
167 if (atomic_read(&proc_event_num_listeners) < 1)
168 return;
169
170 msg = buffer_to_cn_msg(buffer);
171 ev = (struct proc_event *)msg->data;
172 memset(&ev->event_data, 0, sizeof(ev->event_data));
173 ev->timestamp_ns = ktime_get_ns();
174 ev->what = PROC_EVENT_SID;
175 ev->event_data.sid.process_pid = task->pid;
176 ev->event_data.sid.process_tgid = task->tgid;
177
178 memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
179 msg->ack = 0; /* not used */
180 msg->len = sizeof(*ev);
181 msg->flags = 0; /* not used */
182 send_msg(msg);
183}
184
185void proc_ptrace_connector(struct task_struct *task, int ptrace_id)
186{
187 struct cn_msg *msg;
188 struct proc_event *ev;
189 __u8 buffer[CN_PROC_MSG_SIZE] __aligned(8);
190
191 if (atomic_read(&proc_event_num_listeners) < 1)
192 return;
193
194 msg = buffer_to_cn_msg(buffer);
195 ev = (struct proc_event *)msg->data;
196 memset(&ev->event_data, 0, sizeof(ev->event_data));
197 ev->timestamp_ns = ktime_get_ns();
198 ev->what = PROC_EVENT_PTRACE;
199 ev->event_data.ptrace.process_pid = task->pid;
200 ev->event_data.ptrace.process_tgid = task->tgid;
201 if (ptrace_id == PTRACE_ATTACH) {
202 ev->event_data.ptrace.tracer_pid = current->pid;
203 ev->event_data.ptrace.tracer_tgid = current->tgid;
204 } else if (ptrace_id == PTRACE_DETACH) {
205 ev->event_data.ptrace.tracer_pid = 0;
206 ev->event_data.ptrace.tracer_tgid = 0;
207 } else
208 return;
209
210 memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
211 msg->ack = 0; /* not used */
212 msg->len = sizeof(*ev);
213 msg->flags = 0; /* not used */
214 send_msg(msg);
215}
216
217void proc_comm_connector(struct task_struct *task)
218{
219 struct cn_msg *msg;
220 struct proc_event *ev;
221 __u8 buffer[CN_PROC_MSG_SIZE] __aligned(8);
222
223 if (atomic_read(&proc_event_num_listeners) < 1)
224 return;
225
226 msg = buffer_to_cn_msg(buffer);
227 ev = (struct proc_event *)msg->data;
228 memset(&ev->event_data, 0, sizeof(ev->event_data));
229 ev->timestamp_ns = ktime_get_ns();
230 ev->what = PROC_EVENT_COMM;
231 ev->event_data.comm.process_pid = task->pid;
232 ev->event_data.comm.process_tgid = task->tgid;
233 get_task_comm(ev->event_data.comm.comm, task);
234
235 memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
236 msg->ack = 0; /* not used */
237 msg->len = sizeof(*ev);
238 msg->flags = 0; /* not used */
239 send_msg(msg);
240}
241
242void proc_coredump_connector(struct task_struct *task)
243{
244 struct cn_msg *msg;
245 struct proc_event *ev;
246 struct task_struct *parent;
247 __u8 buffer[CN_PROC_MSG_SIZE] __aligned(8);
248
249 if (atomic_read(&proc_event_num_listeners) < 1)
250 return;
251
252 msg = buffer_to_cn_msg(buffer);
253 ev = (struct proc_event *)msg->data;
254 memset(&ev->event_data, 0, sizeof(ev->event_data));
255 ev->timestamp_ns = ktime_get_ns();
256 ev->what = PROC_EVENT_COREDUMP;
257 ev->event_data.coredump.process_pid = task->pid;
258 ev->event_data.coredump.process_tgid = task->tgid;
259
260 rcu_read_lock();
261 if (pid_alive(task)) {
262 parent = rcu_dereference(task->real_parent);
263 ev->event_data.coredump.parent_pid = parent->pid;
264 ev->event_data.coredump.parent_tgid = parent->tgid;
265 }
266 rcu_read_unlock();
267
268 memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
269 msg->ack = 0; /* not used */
270 msg->len = sizeof(*ev);
271 msg->flags = 0; /* not used */
272 send_msg(msg);
273}
274
275void proc_exit_connector(struct task_struct *task)
276{
277 struct cn_msg *msg;
278 struct proc_event *ev;
279 struct task_struct *parent;
280 __u8 buffer[CN_PROC_MSG_SIZE] __aligned(8);
281
282 if (atomic_read(&proc_event_num_listeners) < 1)
283 return;
284
285 msg = buffer_to_cn_msg(buffer);
286 ev = (struct proc_event *)msg->data;
287 memset(&ev->event_data, 0, sizeof(ev->event_data));
288 ev->timestamp_ns = ktime_get_ns();
289 ev->what = PROC_EVENT_EXIT;
290 ev->event_data.exit.process_pid = task->pid;
291 ev->event_data.exit.process_tgid = task->tgid;
292 ev->event_data.exit.exit_code = task->exit_code;
293 ev->event_data.exit.exit_signal = task->exit_signal;
294
295 rcu_read_lock();
296 if (pid_alive(task)) {
297 parent = rcu_dereference(task->real_parent);
298 ev->event_data.exit.parent_pid = parent->pid;
299 ev->event_data.exit.parent_tgid = parent->tgid;
300 }
301 rcu_read_unlock();
302
303 memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
304 msg->ack = 0; /* not used */
305 msg->len = sizeof(*ev);
306 msg->flags = 0; /* not used */
307 send_msg(msg);
308}
309
310/*
311 * Send an acknowledgement message to userspace
312 *
313 * Use 0 for success, EFOO otherwise.
314 * Note: this is the negative of conventional kernel error
315 * values because it's not being returned via syscall return
316 * mechanisms.
317 */
318static void cn_proc_ack(int err, int rcvd_seq, int rcvd_ack)
319{
320 struct cn_msg *msg;
321 struct proc_event *ev;
322 __u8 buffer[CN_PROC_MSG_SIZE] __aligned(8);
323
324 if (atomic_read(&proc_event_num_listeners) < 1)
325 return;
326
327 msg = buffer_to_cn_msg(buffer);
328 ev = (struct proc_event *)msg->data;
329 memset(&ev->event_data, 0, sizeof(ev->event_data));
330 msg->seq = rcvd_seq;
331 ev->timestamp_ns = ktime_get_ns();
332 ev->cpu = -1;
333 ev->what = PROC_EVENT_NONE;
334 ev->event_data.ack.err = err;
335 memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
336 msg->ack = rcvd_ack + 1;
337 msg->len = sizeof(*ev);
338 msg->flags = 0; /* not used */
339 send_msg(msg);
340}
341
342/**
343 * cn_proc_mcast_ctl
344 * @data: message sent from userspace via the connector
345 */
346static void cn_proc_mcast_ctl(struct cn_msg *msg,
347 struct netlink_skb_parms *nsp)
348{
349 enum proc_cn_mcast_op *mc_op = NULL;
350 int err = 0;
351
352 if (msg->len != sizeof(*mc_op))
353 return;
354
355 /*
356 * Events are reported with respect to the initial pid
357 * and user namespaces so ignore requestors from
358 * other namespaces.
359 */
360 if ((current_user_ns() != &init_user_ns) ||
361 !task_is_in_init_pid_ns(current))
362 return;
363
364 /* Can only change if privileged. */
365 if (!__netlink_ns_capable(nsp, &init_user_ns, CAP_NET_ADMIN)) {
366 err = EPERM;
367 goto out;
368 }
369
370 mc_op = (enum proc_cn_mcast_op *)msg->data;
371 switch (*mc_op) {
372 case PROC_CN_MCAST_LISTEN:
373 atomic_inc(&proc_event_num_listeners);
374 break;
375 case PROC_CN_MCAST_IGNORE:
376 atomic_dec(&proc_event_num_listeners);
377 break;
378 default:
379 err = EINVAL;
380 break;
381 }
382
383out:
384 cn_proc_ack(err, msg->seq, msg->ack);
385}
386
387/*
388 * cn_proc_init - initialization entry point
389 *
390 * Adds the connector callback to the connector driver.
391 */
392static int __init cn_proc_init(void)
393{
394 int err = cn_add_callback(&cn_proc_event_id,
395 "cn_proc",
396 &cn_proc_mcast_ctl);
397 if (err) {
398 pr_warn("cn_proc failed to register\n");
399 return err;
400 }
401 return 0;
402}
403device_initcall(cn_proc_init);
1/*
2 * cn_proc.c - process events connector
3 *
4 * Copyright (C) Matt Helsley, IBM Corp. 2005
5 * Based on cn_fork.c by Guillaume Thouvenin <guillaume.thouvenin@bull.net>
6 * Original copyright notice follows:
7 * Copyright (C) 2005 BULL SA.
8 *
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 */
24
25#include <linux/module.h>
26#include <linux/kernel.h>
27#include <linux/ktime.h>
28#include <linux/init.h>
29#include <linux/connector.h>
30#include <linux/gfp.h>
31#include <linux/ptrace.h>
32#include <linux/atomic.h>
33#include <linux/pid_namespace.h>
34
35#include <linux/cn_proc.h>
36
37/*
38 * Size of a cn_msg followed by a proc_event structure. Since the
39 * sizeof struct cn_msg is a multiple of 4 bytes, but not 8 bytes, we
40 * add one 4-byte word to the size here, and then start the actual
41 * cn_msg structure 4 bytes into the stack buffer. The result is that
42 * the immediately following proc_event structure is aligned to 8 bytes.
43 */
44#define CN_PROC_MSG_SIZE (sizeof(struct cn_msg) + sizeof(struct proc_event) + 4)
45
46/* See comment above; we test our assumption about sizeof struct cn_msg here. */
47static inline struct cn_msg *buffer_to_cn_msg(__u8 *buffer)
48{
49 BUILD_BUG_ON(sizeof(struct cn_msg) != 20);
50 return (struct cn_msg *)(buffer + 4);
51}
52
53static atomic_t proc_event_num_listeners = ATOMIC_INIT(0);
54static struct cb_id cn_proc_event_id = { CN_IDX_PROC, CN_VAL_PROC };
55
56/* proc_event_counts is used as the sequence number of the netlink message */
57static DEFINE_PER_CPU(__u32, proc_event_counts) = { 0 };
58
59static inline void get_seq(__u32 *ts, int *cpu)
60{
61 preempt_disable();
62 *ts = __this_cpu_inc_return(proc_event_counts) - 1;
63 *cpu = smp_processor_id();
64 preempt_enable();
65}
66
67void proc_fork_connector(struct task_struct *task)
68{
69 struct cn_msg *msg;
70 struct proc_event *ev;
71 __u8 buffer[CN_PROC_MSG_SIZE] __aligned(8);
72 struct timespec ts;
73 struct task_struct *parent;
74
75 if (atomic_read(&proc_event_num_listeners) < 1)
76 return;
77
78 msg = buffer_to_cn_msg(buffer);
79 ev = (struct proc_event *)msg->data;
80 memset(&ev->event_data, 0, sizeof(ev->event_data));
81 get_seq(&msg->seq, &ev->cpu);
82 ktime_get_ts(&ts); /* get high res monotonic timestamp */
83 ev->timestamp_ns = timespec_to_ns(&ts);
84 ev->what = PROC_EVENT_FORK;
85 rcu_read_lock();
86 parent = rcu_dereference(task->real_parent);
87 ev->event_data.fork.parent_pid = parent->pid;
88 ev->event_data.fork.parent_tgid = parent->tgid;
89 rcu_read_unlock();
90 ev->event_data.fork.child_pid = task->pid;
91 ev->event_data.fork.child_tgid = task->tgid;
92
93 memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
94 msg->ack = 0; /* not used */
95 msg->len = sizeof(*ev);
96 msg->flags = 0; /* not used */
97 /* If cn_netlink_send() failed, the data is not sent */
98 cn_netlink_send(msg, 0, CN_IDX_PROC, GFP_KERNEL);
99}
100
101void proc_exec_connector(struct task_struct *task)
102{
103 struct cn_msg *msg;
104 struct proc_event *ev;
105 struct timespec ts;
106 __u8 buffer[CN_PROC_MSG_SIZE] __aligned(8);
107
108 if (atomic_read(&proc_event_num_listeners) < 1)
109 return;
110
111 msg = buffer_to_cn_msg(buffer);
112 ev = (struct proc_event *)msg->data;
113 memset(&ev->event_data, 0, sizeof(ev->event_data));
114 get_seq(&msg->seq, &ev->cpu);
115 ktime_get_ts(&ts); /* get high res monotonic timestamp */
116 ev->timestamp_ns = timespec_to_ns(&ts);
117 ev->what = PROC_EVENT_EXEC;
118 ev->event_data.exec.process_pid = task->pid;
119 ev->event_data.exec.process_tgid = task->tgid;
120
121 memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
122 msg->ack = 0; /* not used */
123 msg->len = sizeof(*ev);
124 msg->flags = 0; /* not used */
125 cn_netlink_send(msg, 0, CN_IDX_PROC, GFP_KERNEL);
126}
127
128void proc_id_connector(struct task_struct *task, int which_id)
129{
130 struct cn_msg *msg;
131 struct proc_event *ev;
132 __u8 buffer[CN_PROC_MSG_SIZE] __aligned(8);
133 struct timespec ts;
134 const struct cred *cred;
135
136 if (atomic_read(&proc_event_num_listeners) < 1)
137 return;
138
139 msg = buffer_to_cn_msg(buffer);
140 ev = (struct proc_event *)msg->data;
141 memset(&ev->event_data, 0, sizeof(ev->event_data));
142 ev->what = which_id;
143 ev->event_data.id.process_pid = task->pid;
144 ev->event_data.id.process_tgid = task->tgid;
145 rcu_read_lock();
146 cred = __task_cred(task);
147 if (which_id == PROC_EVENT_UID) {
148 ev->event_data.id.r.ruid = from_kuid_munged(&init_user_ns, cred->uid);
149 ev->event_data.id.e.euid = from_kuid_munged(&init_user_ns, cred->euid);
150 } else if (which_id == PROC_EVENT_GID) {
151 ev->event_data.id.r.rgid = from_kgid_munged(&init_user_ns, cred->gid);
152 ev->event_data.id.e.egid = from_kgid_munged(&init_user_ns, cred->egid);
153 } else {
154 rcu_read_unlock();
155 return;
156 }
157 rcu_read_unlock();
158 get_seq(&msg->seq, &ev->cpu);
159 ktime_get_ts(&ts); /* get high res monotonic timestamp */
160 ev->timestamp_ns = timespec_to_ns(&ts);
161
162 memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
163 msg->ack = 0; /* not used */
164 msg->len = sizeof(*ev);
165 msg->flags = 0; /* not used */
166 cn_netlink_send(msg, 0, CN_IDX_PROC, GFP_KERNEL);
167}
168
169void proc_sid_connector(struct task_struct *task)
170{
171 struct cn_msg *msg;
172 struct proc_event *ev;
173 struct timespec ts;
174 __u8 buffer[CN_PROC_MSG_SIZE] __aligned(8);
175
176 if (atomic_read(&proc_event_num_listeners) < 1)
177 return;
178
179 msg = buffer_to_cn_msg(buffer);
180 ev = (struct proc_event *)msg->data;
181 memset(&ev->event_data, 0, sizeof(ev->event_data));
182 get_seq(&msg->seq, &ev->cpu);
183 ktime_get_ts(&ts); /* get high res monotonic timestamp */
184 ev->timestamp_ns = timespec_to_ns(&ts);
185 ev->what = PROC_EVENT_SID;
186 ev->event_data.sid.process_pid = task->pid;
187 ev->event_data.sid.process_tgid = task->tgid;
188
189 memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
190 msg->ack = 0; /* not used */
191 msg->len = sizeof(*ev);
192 msg->flags = 0; /* not used */
193 cn_netlink_send(msg, 0, CN_IDX_PROC, GFP_KERNEL);
194}
195
196void proc_ptrace_connector(struct task_struct *task, int ptrace_id)
197{
198 struct cn_msg *msg;
199 struct proc_event *ev;
200 struct timespec ts;
201 __u8 buffer[CN_PROC_MSG_SIZE] __aligned(8);
202
203 if (atomic_read(&proc_event_num_listeners) < 1)
204 return;
205
206 msg = buffer_to_cn_msg(buffer);
207 ev = (struct proc_event *)msg->data;
208 memset(&ev->event_data, 0, sizeof(ev->event_data));
209 get_seq(&msg->seq, &ev->cpu);
210 ktime_get_ts(&ts); /* get high res monotonic timestamp */
211 ev->timestamp_ns = timespec_to_ns(&ts);
212 ev->what = PROC_EVENT_PTRACE;
213 ev->event_data.ptrace.process_pid = task->pid;
214 ev->event_data.ptrace.process_tgid = task->tgid;
215 if (ptrace_id == PTRACE_ATTACH) {
216 ev->event_data.ptrace.tracer_pid = current->pid;
217 ev->event_data.ptrace.tracer_tgid = current->tgid;
218 } else if (ptrace_id == PTRACE_DETACH) {
219 ev->event_data.ptrace.tracer_pid = 0;
220 ev->event_data.ptrace.tracer_tgid = 0;
221 } else
222 return;
223
224 memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
225 msg->ack = 0; /* not used */
226 msg->len = sizeof(*ev);
227 msg->flags = 0; /* not used */
228 cn_netlink_send(msg, 0, CN_IDX_PROC, GFP_KERNEL);
229}
230
231void proc_comm_connector(struct task_struct *task)
232{
233 struct cn_msg *msg;
234 struct proc_event *ev;
235 struct timespec ts;
236 __u8 buffer[CN_PROC_MSG_SIZE] __aligned(8);
237
238 if (atomic_read(&proc_event_num_listeners) < 1)
239 return;
240
241 msg = buffer_to_cn_msg(buffer);
242 ev = (struct proc_event *)msg->data;
243 memset(&ev->event_data, 0, sizeof(ev->event_data));
244 get_seq(&msg->seq, &ev->cpu);
245 ktime_get_ts(&ts); /* get high res monotonic timestamp */
246 ev->timestamp_ns = timespec_to_ns(&ts);
247 ev->what = PROC_EVENT_COMM;
248 ev->event_data.comm.process_pid = task->pid;
249 ev->event_data.comm.process_tgid = task->tgid;
250 get_task_comm(ev->event_data.comm.comm, task);
251
252 memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
253 msg->ack = 0; /* not used */
254 msg->len = sizeof(*ev);
255 msg->flags = 0; /* not used */
256 cn_netlink_send(msg, 0, CN_IDX_PROC, GFP_KERNEL);
257}
258
259void proc_coredump_connector(struct task_struct *task)
260{
261 struct cn_msg *msg;
262 struct proc_event *ev;
263 __u8 buffer[CN_PROC_MSG_SIZE] __aligned(8);
264 struct timespec ts;
265
266 if (atomic_read(&proc_event_num_listeners) < 1)
267 return;
268
269 msg = buffer_to_cn_msg(buffer);
270 ev = (struct proc_event *)msg->data;
271 memset(&ev->event_data, 0, sizeof(ev->event_data));
272 get_seq(&msg->seq, &ev->cpu);
273 ktime_get_ts(&ts); /* get high res monotonic timestamp */
274 ev->timestamp_ns = timespec_to_ns(&ts);
275 ev->what = PROC_EVENT_COREDUMP;
276 ev->event_data.coredump.process_pid = task->pid;
277 ev->event_data.coredump.process_tgid = task->tgid;
278
279 memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
280 msg->ack = 0; /* not used */
281 msg->len = sizeof(*ev);
282 msg->flags = 0; /* not used */
283 cn_netlink_send(msg, 0, CN_IDX_PROC, GFP_KERNEL);
284}
285
286void proc_exit_connector(struct task_struct *task)
287{
288 struct cn_msg *msg;
289 struct proc_event *ev;
290 __u8 buffer[CN_PROC_MSG_SIZE] __aligned(8);
291 struct timespec ts;
292
293 if (atomic_read(&proc_event_num_listeners) < 1)
294 return;
295
296 msg = buffer_to_cn_msg(buffer);
297 ev = (struct proc_event *)msg->data;
298 memset(&ev->event_data, 0, sizeof(ev->event_data));
299 get_seq(&msg->seq, &ev->cpu);
300 ktime_get_ts(&ts); /* get high res monotonic timestamp */
301 ev->timestamp_ns = timespec_to_ns(&ts);
302 ev->what = PROC_EVENT_EXIT;
303 ev->event_data.exit.process_pid = task->pid;
304 ev->event_data.exit.process_tgid = task->tgid;
305 ev->event_data.exit.exit_code = task->exit_code;
306 ev->event_data.exit.exit_signal = task->exit_signal;
307
308 memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
309 msg->ack = 0; /* not used */
310 msg->len = sizeof(*ev);
311 msg->flags = 0; /* not used */
312 cn_netlink_send(msg, 0, CN_IDX_PROC, GFP_KERNEL);
313}
314
315/*
316 * Send an acknowledgement message to userspace
317 *
318 * Use 0 for success, EFOO otherwise.
319 * Note: this is the negative of conventional kernel error
320 * values because it's not being returned via syscall return
321 * mechanisms.
322 */
323static void cn_proc_ack(int err, int rcvd_seq, int rcvd_ack)
324{
325 struct cn_msg *msg;
326 struct proc_event *ev;
327 __u8 buffer[CN_PROC_MSG_SIZE] __aligned(8);
328 struct timespec ts;
329
330 if (atomic_read(&proc_event_num_listeners) < 1)
331 return;
332
333 msg = buffer_to_cn_msg(buffer);
334 ev = (struct proc_event *)msg->data;
335 memset(&ev->event_data, 0, sizeof(ev->event_data));
336 msg->seq = rcvd_seq;
337 ktime_get_ts(&ts); /* get high res monotonic timestamp */
338 ev->timestamp_ns = timespec_to_ns(&ts);
339 ev->cpu = -1;
340 ev->what = PROC_EVENT_NONE;
341 ev->event_data.ack.err = err;
342 memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
343 msg->ack = rcvd_ack + 1;
344 msg->len = sizeof(*ev);
345 msg->flags = 0; /* not used */
346 cn_netlink_send(msg, 0, CN_IDX_PROC, GFP_KERNEL);
347}
348
349/**
350 * cn_proc_mcast_ctl
351 * @data: message sent from userspace via the connector
352 */
353static void cn_proc_mcast_ctl(struct cn_msg *msg,
354 struct netlink_skb_parms *nsp)
355{
356 enum proc_cn_mcast_op *mc_op = NULL;
357 int err = 0;
358
359 if (msg->len != sizeof(*mc_op))
360 return;
361
362 /*
363 * Events are reported with respect to the initial pid
364 * and user namespaces so ignore requestors from
365 * other namespaces.
366 */
367 if ((current_user_ns() != &init_user_ns) ||
368 (task_active_pid_ns(current) != &init_pid_ns))
369 return;
370
371 /* Can only change if privileged. */
372 if (!__netlink_ns_capable(nsp, &init_user_ns, CAP_NET_ADMIN)) {
373 err = EPERM;
374 goto out;
375 }
376
377 mc_op = (enum proc_cn_mcast_op *)msg->data;
378 switch (*mc_op) {
379 case PROC_CN_MCAST_LISTEN:
380 atomic_inc(&proc_event_num_listeners);
381 break;
382 case PROC_CN_MCAST_IGNORE:
383 atomic_dec(&proc_event_num_listeners);
384 break;
385 default:
386 err = EINVAL;
387 break;
388 }
389
390out:
391 cn_proc_ack(err, msg->seq, msg->ack);
392}
393
394/*
395 * cn_proc_init - initialization entry point
396 *
397 * Adds the connector callback to the connector driver.
398 */
399static int __init cn_proc_init(void)
400{
401 int err = cn_add_callback(&cn_proc_event_id,
402 "cn_proc",
403 &cn_proc_mcast_ctl);
404 if (err) {
405 pr_warn("cn_proc failed to register\n");
406 return err;
407 }
408 return 0;
409}
410
411module_init(cn_proc_init);