Commit | Line | Data |
---|---|---|
9f46080c MH |
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> | |
caf3c9dc | 27 | #include <linux/ktime.h> |
9f46080c | 28 | #include <linux/init.h> |
1d31a4ea | 29 | #include <linux/connector.h> |
5a0e3ad6 | 30 | #include <linux/gfp.h> |
f701e5b7 | 31 | #include <linux/ptrace.h> |
60063497 | 32 | #include <linux/atomic.h> |
9582d901 | 33 | #include <linux/pid_namespace.h> |
60063497 | 34 | |
9f46080c MH |
35 | #include <linux/cn_proc.h> |
36 | ||
1ca1a4cf CM |
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. */ | |
47 | static 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 | } | |
9f46080c MH |
52 | |
53 | static atomic_t proc_event_num_listeners = ATOMIC_INIT(0); | |
54 | static struct cb_id cn_proc_event_id = { CN_IDX_PROC, CN_VAL_PROC }; | |
55 | ||
cc398c2e | 56 | /* proc_event_counts is used as the sequence number of the netlink message */ |
9f46080c MH |
57 | static DEFINE_PER_CPU(__u32, proc_event_counts) = { 0 }; |
58 | ||
59 | static inline void get_seq(__u32 *ts, int *cpu) | |
60 | { | |
3ea9f683 | 61 | preempt_disable(); |
f3c48ecc | 62 | *ts = __this_cpu_inc_return(proc_event_counts) - 1; |
9f46080c | 63 | *cpu = smp_processor_id(); |
3ea9f683 | 64 | preempt_enable(); |
9f46080c MH |
65 | } |
66 | ||
67 | void proc_fork_connector(struct task_struct *task) | |
68 | { | |
69 | struct cn_msg *msg; | |
70 | struct proc_event *ev; | |
1ca1a4cf | 71 | __u8 buffer[CN_PROC_MSG_SIZE] __aligned(8); |
822cfbff | 72 | struct timespec ts; |
9e8f90df | 73 | struct task_struct *parent; |
9f46080c MH |
74 | |
75 | if (atomic_read(&proc_event_num_listeners) < 1) | |
76 | return; | |
77 | ||
1ca1a4cf | 78 | msg = buffer_to_cn_msg(buffer); |
f3c48ecc | 79 | ev = (struct proc_event *)msg->data; |
e727ca82 | 80 | memset(&ev->event_data, 0, sizeof(ev->event_data)); |
9f46080c | 81 | get_seq(&msg->seq, &ev->cpu); |
822cfbff | 82 | ktime_get_ts(&ts); /* get high res monotonic timestamp */ |
1ca1a4cf | 83 | ev->timestamp_ns = timespec_to_ns(&ts); |
9f46080c | 84 | ev->what = PROC_EVENT_FORK; |
9e8f90df ON |
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(); | |
9f46080c MH |
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); | |
e727ca82 | 96 | msg->flags = 0; /* not used */ |
9f46080c | 97 | /* If cn_netlink_send() failed, the data is not sent */ |
ac8f7330 | 98 | cn_netlink_send(msg, 0, CN_IDX_PROC, GFP_KERNEL); |
9f46080c MH |
99 | } |
100 | ||
101 | void proc_exec_connector(struct task_struct *task) | |
102 | { | |
103 | struct cn_msg *msg; | |
104 | struct proc_event *ev; | |
822cfbff | 105 | struct timespec ts; |
1ca1a4cf | 106 | __u8 buffer[CN_PROC_MSG_SIZE] __aligned(8); |
9f46080c MH |
107 | |
108 | if (atomic_read(&proc_event_num_listeners) < 1) | |
109 | return; | |
110 | ||
1ca1a4cf | 111 | msg = buffer_to_cn_msg(buffer); |
f3c48ecc | 112 | ev = (struct proc_event *)msg->data; |
e727ca82 | 113 | memset(&ev->event_data, 0, sizeof(ev->event_data)); |
9f46080c | 114 | get_seq(&msg->seq, &ev->cpu); |
822cfbff | 115 | ktime_get_ts(&ts); /* get high res monotonic timestamp */ |
1ca1a4cf | 116 | ev->timestamp_ns = timespec_to_ns(&ts); |
9f46080c MH |
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); | |
e727ca82 | 124 | msg->flags = 0; /* not used */ |
ac8f7330 | 125 | cn_netlink_send(msg, 0, CN_IDX_PROC, GFP_KERNEL); |
9f46080c MH |
126 | } |
127 | ||
128 | void proc_id_connector(struct task_struct *task, int which_id) | |
129 | { | |
130 | struct cn_msg *msg; | |
131 | struct proc_event *ev; | |
1ca1a4cf | 132 | __u8 buffer[CN_PROC_MSG_SIZE] __aligned(8); |
822cfbff | 133 | struct timespec ts; |
c69e8d9c | 134 | const struct cred *cred; |
9f46080c MH |
135 | |
136 | if (atomic_read(&proc_event_num_listeners) < 1) | |
137 | return; | |
138 | ||
1ca1a4cf | 139 | msg = buffer_to_cn_msg(buffer); |
f3c48ecc | 140 | ev = (struct proc_event *)msg->data; |
e727ca82 | 141 | memset(&ev->event_data, 0, sizeof(ev->event_data)); |
9f46080c MH |
142 | ev->what = which_id; |
143 | ev->event_data.id.process_pid = task->pid; | |
144 | ev->event_data.id.process_tgid = task->tgid; | |
c69e8d9c DH |
145 | rcu_read_lock(); |
146 | cred = __task_cred(task); | |
9f46080c | 147 | if (which_id == PROC_EVENT_UID) { |
9582d901 EB |
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); | |
9f46080c | 150 | } else if (which_id == PROC_EVENT_GID) { |
9582d901 EB |
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); | |
c69e8d9c DH |
153 | } else { |
154 | rcu_read_unlock(); | |
f3c48ecc | 155 | return; |
c69e8d9c DH |
156 | } |
157 | rcu_read_unlock(); | |
9f46080c | 158 | get_seq(&msg->seq, &ev->cpu); |
822cfbff | 159 | ktime_get_ts(&ts); /* get high res monotonic timestamp */ |
1ca1a4cf | 160 | ev->timestamp_ns = timespec_to_ns(&ts); |
9f46080c MH |
161 | |
162 | memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id)); | |
163 | msg->ack = 0; /* not used */ | |
164 | msg->len = sizeof(*ev); | |
e727ca82 | 165 | msg->flags = 0; /* not used */ |
ac8f7330 | 166 | cn_netlink_send(msg, 0, CN_IDX_PROC, GFP_KERNEL); |
9f46080c MH |
167 | } |
168 | ||
02b51df1 SJR |
169 | void proc_sid_connector(struct task_struct *task) |
170 | { | |
171 | struct cn_msg *msg; | |
172 | struct proc_event *ev; | |
173 | struct timespec ts; | |
1ca1a4cf | 174 | __u8 buffer[CN_PROC_MSG_SIZE] __aligned(8); |
02b51df1 SJR |
175 | |
176 | if (atomic_read(&proc_event_num_listeners) < 1) | |
177 | return; | |
178 | ||
1ca1a4cf | 179 | msg = buffer_to_cn_msg(buffer); |
02b51df1 | 180 | ev = (struct proc_event *)msg->data; |
e727ca82 | 181 | memset(&ev->event_data, 0, sizeof(ev->event_data)); |
02b51df1 SJR |
182 | get_seq(&msg->seq, &ev->cpu); |
183 | ktime_get_ts(&ts); /* get high res monotonic timestamp */ | |
1ca1a4cf | 184 | ev->timestamp_ns = timespec_to_ns(&ts); |
02b51df1 SJR |
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); | |
e727ca82 | 192 | msg->flags = 0; /* not used */ |
ac8f7330 | 193 | cn_netlink_send(msg, 0, CN_IDX_PROC, GFP_KERNEL); |
02b51df1 SJR |
194 | } |
195 | ||
f701e5b7 VZ |
196 | void 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; | |
1ca1a4cf | 201 | __u8 buffer[CN_PROC_MSG_SIZE] __aligned(8); |
f701e5b7 VZ |
202 | |
203 | if (atomic_read(&proc_event_num_listeners) < 1) | |
204 | return; | |
205 | ||
1ca1a4cf | 206 | msg = buffer_to_cn_msg(buffer); |
f701e5b7 | 207 | ev = (struct proc_event *)msg->data; |
e727ca82 | 208 | memset(&ev->event_data, 0, sizeof(ev->event_data)); |
f701e5b7 VZ |
209 | get_seq(&msg->seq, &ev->cpu); |
210 | ktime_get_ts(&ts); /* get high res monotonic timestamp */ | |
1ca1a4cf | 211 | ev->timestamp_ns = timespec_to_ns(&ts); |
f701e5b7 VZ |
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); | |
e727ca82 | 227 | msg->flags = 0; /* not used */ |
ac8f7330 | 228 | cn_netlink_send(msg, 0, CN_IDX_PROC, GFP_KERNEL); |
f701e5b7 VZ |
229 | } |
230 | ||
f786ecba VZ |
231 | void proc_comm_connector(struct task_struct *task) |
232 | { | |
233 | struct cn_msg *msg; | |
234 | struct proc_event *ev; | |
235 | struct timespec ts; | |
1ca1a4cf | 236 | __u8 buffer[CN_PROC_MSG_SIZE] __aligned(8); |
f786ecba VZ |
237 | |
238 | if (atomic_read(&proc_event_num_listeners) < 1) | |
239 | return; | |
240 | ||
1ca1a4cf | 241 | msg = buffer_to_cn_msg(buffer); |
f786ecba | 242 | ev = (struct proc_event *)msg->data; |
e727ca82 | 243 | memset(&ev->event_data, 0, sizeof(ev->event_data)); |
f786ecba VZ |
244 | get_seq(&msg->seq, &ev->cpu); |
245 | ktime_get_ts(&ts); /* get high res monotonic timestamp */ | |
1ca1a4cf | 246 | ev->timestamp_ns = timespec_to_ns(&ts); |
f786ecba VZ |
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); | |
e727ca82 | 255 | msg->flags = 0; /* not used */ |
ac8f7330 | 256 | cn_netlink_send(msg, 0, CN_IDX_PROC, GFP_KERNEL); |
2b5faa4c JD |
257 | } |
258 | ||
259 | void proc_coredump_connector(struct task_struct *task) | |
260 | { | |
261 | struct cn_msg *msg; | |
262 | struct proc_event *ev; | |
1ca1a4cf | 263 | __u8 buffer[CN_PROC_MSG_SIZE] __aligned(8); |
2b5faa4c JD |
264 | struct timespec ts; |
265 | ||
266 | if (atomic_read(&proc_event_num_listeners) < 1) | |
267 | return; | |
268 | ||
1ca1a4cf | 269 | msg = buffer_to_cn_msg(buffer); |
2b5faa4c | 270 | ev = (struct proc_event *)msg->data; |
e727ca82 | 271 | memset(&ev->event_data, 0, sizeof(ev->event_data)); |
2b5faa4c JD |
272 | get_seq(&msg->seq, &ev->cpu); |
273 | ktime_get_ts(&ts); /* get high res monotonic timestamp */ | |
1ca1a4cf | 274 | ev->timestamp_ns = timespec_to_ns(&ts); |
2b5faa4c JD |
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); | |
e727ca82 | 282 | msg->flags = 0; /* not used */ |
ac8f7330 | 283 | cn_netlink_send(msg, 0, CN_IDX_PROC, GFP_KERNEL); |
f786ecba VZ |
284 | } |
285 | ||
9f46080c MH |
286 | void proc_exit_connector(struct task_struct *task) |
287 | { | |
288 | struct cn_msg *msg; | |
289 | struct proc_event *ev; | |
1ca1a4cf | 290 | __u8 buffer[CN_PROC_MSG_SIZE] __aligned(8); |
822cfbff | 291 | struct timespec ts; |
9f46080c MH |
292 | |
293 | if (atomic_read(&proc_event_num_listeners) < 1) | |
294 | return; | |
295 | ||
1ca1a4cf | 296 | msg = buffer_to_cn_msg(buffer); |
f3c48ecc | 297 | ev = (struct proc_event *)msg->data; |
e727ca82 | 298 | memset(&ev->event_data, 0, sizeof(ev->event_data)); |
9f46080c | 299 | get_seq(&msg->seq, &ev->cpu); |
822cfbff | 300 | ktime_get_ts(&ts); /* get high res monotonic timestamp */ |
1ca1a4cf | 301 | ev->timestamp_ns = timespec_to_ns(&ts); |
9f46080c MH |
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); | |
e727ca82 | 311 | msg->flags = 0; /* not used */ |
ac8f7330 | 312 | cn_netlink_send(msg, 0, CN_IDX_PROC, GFP_KERNEL); |
9f46080c MH |
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 | */ | |
323 | static void cn_proc_ack(int err, int rcvd_seq, int rcvd_ack) | |
324 | { | |
325 | struct cn_msg *msg; | |
326 | struct proc_event *ev; | |
1ca1a4cf | 327 | __u8 buffer[CN_PROC_MSG_SIZE] __aligned(8); |
822cfbff | 328 | struct timespec ts; |
9f46080c MH |
329 | |
330 | if (atomic_read(&proc_event_num_listeners) < 1) | |
331 | return; | |
332 | ||
1ca1a4cf | 333 | msg = buffer_to_cn_msg(buffer); |
f3c48ecc | 334 | ev = (struct proc_event *)msg->data; |
e727ca82 | 335 | memset(&ev->event_data, 0, sizeof(ev->event_data)); |
9f46080c | 336 | msg->seq = rcvd_seq; |
822cfbff | 337 | ktime_get_ts(&ts); /* get high res monotonic timestamp */ |
1ca1a4cf | 338 | ev->timestamp_ns = timespec_to_ns(&ts); |
9f46080c MH |
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); | |
e727ca82 | 345 | msg->flags = 0; /* not used */ |
ac8f7330 | 346 | cn_netlink_send(msg, 0, CN_IDX_PROC, GFP_KERNEL); |
9f46080c MH |
347 | } |
348 | ||
349 | /** | |
350 | * cn_proc_mcast_ctl | |
351 | * @data: message sent from userspace via the connector | |
352 | */ | |
f0b25932 SB |
353 | static void cn_proc_mcast_ctl(struct cn_msg *msg, |
354 | struct netlink_skb_parms *nsp) | |
9f46080c | 355 | { |
9f46080c MH |
356 | enum proc_cn_mcast_op *mc_op = NULL; |
357 | int err = 0; | |
358 | ||
359 | if (msg->len != sizeof(*mc_op)) | |
360 | return; | |
361 | ||
9582d901 EB |
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 | ||
e70ab977 | 371 | /* Can only change if privileged. */ |
90f62cf3 | 372 | if (!__netlink_ns_capable(nsp, &init_user_ns, CAP_NET_ADMIN)) { |
e70ab977 KC |
373 | err = EPERM; |
374 | goto out; | |
375 | } | |
376 | ||
f3c48ecc | 377 | mc_op = (enum proc_cn_mcast_op *)msg->data; |
9f46080c MH |
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 | } | |
e70ab977 KC |
389 | |
390 | out: | |
9f46080c MH |
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 | */ | |
399 | static int __init cn_proc_init(void) | |
400 | { | |
f3c48ecc VI |
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"); | |
9f46080c MH |
406 | return err; |
407 | } | |
408 | return 0; | |
409 | } | |
410 | ||
411 | module_init(cn_proc_init); |