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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);
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
34#include <asm/unaligned.h>
35
36#include <linux/cn_proc.h>
37
38#define CN_PROC_MSG_SIZE (sizeof(struct cn_msg) + sizeof(struct proc_event))
39
40static atomic_t proc_event_num_listeners = ATOMIC_INIT(0);
41static struct cb_id cn_proc_event_id = { CN_IDX_PROC, CN_VAL_PROC };
42
43/* proc_event_counts is used as the sequence number of the netlink message */
44static DEFINE_PER_CPU(__u32, proc_event_counts) = { 0 };
45
46static inline void get_seq(__u32 *ts, int *cpu)
47{
48 preempt_disable();
49 *ts = __this_cpu_inc_return(proc_event_counts) -1;
50 *cpu = smp_processor_id();
51 preempt_enable();
52}
53
54void proc_fork_connector(struct task_struct *task)
55{
56 struct cn_msg *msg;
57 struct proc_event *ev;
58 __u8 buffer[CN_PROC_MSG_SIZE];
59 struct timespec ts;
60 struct task_struct *parent;
61
62 if (atomic_read(&proc_event_num_listeners) < 1)
63 return;
64
65 msg = (struct cn_msg*)buffer;
66 ev = (struct proc_event*)msg->data;
67 get_seq(&msg->seq, &ev->cpu);
68 ktime_get_ts(&ts); /* get high res monotonic timestamp */
69 put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns);
70 ev->what = PROC_EVENT_FORK;
71 rcu_read_lock();
72 parent = rcu_dereference(task->real_parent);
73 ev->event_data.fork.parent_pid = parent->pid;
74 ev->event_data.fork.parent_tgid = parent->tgid;
75 rcu_read_unlock();
76 ev->event_data.fork.child_pid = task->pid;
77 ev->event_data.fork.child_tgid = task->tgid;
78
79 memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
80 msg->ack = 0; /* not used */
81 msg->len = sizeof(*ev);
82 /* If cn_netlink_send() failed, the data is not sent */
83 cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
84}
85
86void proc_exec_connector(struct task_struct *task)
87{
88 struct cn_msg *msg;
89 struct proc_event *ev;
90 struct timespec ts;
91 __u8 buffer[CN_PROC_MSG_SIZE];
92
93 if (atomic_read(&proc_event_num_listeners) < 1)
94 return;
95
96 msg = (struct cn_msg*)buffer;
97 ev = (struct proc_event*)msg->data;
98 get_seq(&msg->seq, &ev->cpu);
99 ktime_get_ts(&ts); /* get high res monotonic timestamp */
100 put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns);
101 ev->what = PROC_EVENT_EXEC;
102 ev->event_data.exec.process_pid = task->pid;
103 ev->event_data.exec.process_tgid = task->tgid;
104
105 memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
106 msg->ack = 0; /* not used */
107 msg->len = sizeof(*ev);
108 cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
109}
110
111void proc_id_connector(struct task_struct *task, int which_id)
112{
113 struct cn_msg *msg;
114 struct proc_event *ev;
115 __u8 buffer[CN_PROC_MSG_SIZE];
116 struct timespec ts;
117 const struct cred *cred;
118
119 if (atomic_read(&proc_event_num_listeners) < 1)
120 return;
121
122 msg = (struct cn_msg*)buffer;
123 ev = (struct proc_event*)msg->data;
124 ev->what = which_id;
125 ev->event_data.id.process_pid = task->pid;
126 ev->event_data.id.process_tgid = task->tgid;
127 rcu_read_lock();
128 cred = __task_cred(task);
129 if (which_id == PROC_EVENT_UID) {
130 ev->event_data.id.r.ruid = cred->uid;
131 ev->event_data.id.e.euid = cred->euid;
132 } else if (which_id == PROC_EVENT_GID) {
133 ev->event_data.id.r.rgid = cred->gid;
134 ev->event_data.id.e.egid = cred->egid;
135 } else {
136 rcu_read_unlock();
137 return;
138 }
139 rcu_read_unlock();
140 get_seq(&msg->seq, &ev->cpu);
141 ktime_get_ts(&ts); /* get high res monotonic timestamp */
142 put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns);
143
144 memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
145 msg->ack = 0; /* not used */
146 msg->len = sizeof(*ev);
147 cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
148}
149
150void proc_sid_connector(struct task_struct *task)
151{
152 struct cn_msg *msg;
153 struct proc_event *ev;
154 struct timespec ts;
155 __u8 buffer[CN_PROC_MSG_SIZE];
156
157 if (atomic_read(&proc_event_num_listeners) < 1)
158 return;
159
160 msg = (struct cn_msg *)buffer;
161 ev = (struct proc_event *)msg->data;
162 get_seq(&msg->seq, &ev->cpu);
163 ktime_get_ts(&ts); /* get high res monotonic timestamp */
164 put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns);
165 ev->what = PROC_EVENT_SID;
166 ev->event_data.sid.process_pid = task->pid;
167 ev->event_data.sid.process_tgid = task->tgid;
168
169 memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
170 msg->ack = 0; /* not used */
171 msg->len = sizeof(*ev);
172 cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
173}
174
175void proc_ptrace_connector(struct task_struct *task, int ptrace_id)
176{
177 struct cn_msg *msg;
178 struct proc_event *ev;
179 struct timespec ts;
180 __u8 buffer[CN_PROC_MSG_SIZE];
181
182 if (atomic_read(&proc_event_num_listeners) < 1)
183 return;
184
185 msg = (struct cn_msg *)buffer;
186 ev = (struct proc_event *)msg->data;
187 get_seq(&msg->seq, &ev->cpu);
188 ktime_get_ts(&ts); /* get high res monotonic timestamp */
189 put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns);
190 ev->what = PROC_EVENT_PTRACE;
191 ev->event_data.ptrace.process_pid = task->pid;
192 ev->event_data.ptrace.process_tgid = task->tgid;
193 if (ptrace_id == PTRACE_ATTACH) {
194 ev->event_data.ptrace.tracer_pid = current->pid;
195 ev->event_data.ptrace.tracer_tgid = current->tgid;
196 } else if (ptrace_id == PTRACE_DETACH) {
197 ev->event_data.ptrace.tracer_pid = 0;
198 ev->event_data.ptrace.tracer_tgid = 0;
199 } else
200 return;
201
202 memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
203 msg->ack = 0; /* not used */
204 msg->len = sizeof(*ev);
205 cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
206}
207
208void proc_exit_connector(struct task_struct *task)
209{
210 struct cn_msg *msg;
211 struct proc_event *ev;
212 __u8 buffer[CN_PROC_MSG_SIZE];
213 struct timespec ts;
214
215 if (atomic_read(&proc_event_num_listeners) < 1)
216 return;
217
218 msg = (struct cn_msg*)buffer;
219 ev = (struct proc_event*)msg->data;
220 get_seq(&msg->seq, &ev->cpu);
221 ktime_get_ts(&ts); /* get high res monotonic timestamp */
222 put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns);
223 ev->what = PROC_EVENT_EXIT;
224 ev->event_data.exit.process_pid = task->pid;
225 ev->event_data.exit.process_tgid = task->tgid;
226 ev->event_data.exit.exit_code = task->exit_code;
227 ev->event_data.exit.exit_signal = task->exit_signal;
228
229 memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
230 msg->ack = 0; /* not used */
231 msg->len = sizeof(*ev);
232 cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
233}
234
235/*
236 * Send an acknowledgement message to userspace
237 *
238 * Use 0 for success, EFOO otherwise.
239 * Note: this is the negative of conventional kernel error
240 * values because it's not being returned via syscall return
241 * mechanisms.
242 */
243static void cn_proc_ack(int err, int rcvd_seq, int rcvd_ack)
244{
245 struct cn_msg *msg;
246 struct proc_event *ev;
247 __u8 buffer[CN_PROC_MSG_SIZE];
248 struct timespec ts;
249
250 if (atomic_read(&proc_event_num_listeners) < 1)
251 return;
252
253 msg = (struct cn_msg*)buffer;
254 ev = (struct proc_event*)msg->data;
255 msg->seq = rcvd_seq;
256 ktime_get_ts(&ts); /* get high res monotonic timestamp */
257 put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns);
258 ev->cpu = -1;
259 ev->what = PROC_EVENT_NONE;
260 ev->event_data.ack.err = err;
261 memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
262 msg->ack = rcvd_ack + 1;
263 msg->len = sizeof(*ev);
264 cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
265}
266
267/**
268 * cn_proc_mcast_ctl
269 * @data: message sent from userspace via the connector
270 */
271static void cn_proc_mcast_ctl(struct cn_msg *msg,
272 struct netlink_skb_parms *nsp)
273{
274 enum proc_cn_mcast_op *mc_op = NULL;
275 int err = 0;
276
277 if (msg->len != sizeof(*mc_op))
278 return;
279
280 mc_op = (enum proc_cn_mcast_op*)msg->data;
281 switch (*mc_op) {
282 case PROC_CN_MCAST_LISTEN:
283 atomic_inc(&proc_event_num_listeners);
284 break;
285 case PROC_CN_MCAST_IGNORE:
286 atomic_dec(&proc_event_num_listeners);
287 break;
288 default:
289 err = EINVAL;
290 break;
291 }
292 cn_proc_ack(err, msg->seq, msg->ack);
293}
294
295/*
296 * cn_proc_init - initialization entry point
297 *
298 * Adds the connector callback to the connector driver.
299 */
300static int __init cn_proc_init(void)
301{
302 int err;
303
304 if ((err = cn_add_callback(&cn_proc_event_id, "cn_proc",
305 &cn_proc_mcast_ctl))) {
306 printk(KERN_WARNING "cn_proc failed to register\n");
307 return err;
308 }
309 return 0;
310}
311
312module_init(cn_proc_init);