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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 <asm/unaligned.h> |
36 | |
37 | #include <linux/cn_proc.h> |
38 | |
39 | #define CN_PROC_MSG_SIZE (sizeof(struct cn_msg) + sizeof(struct proc_event)) |
40 | |
41 | static atomic_t proc_event_num_listeners = ATOMIC_INIT(0); |
42 | static struct cb_id cn_proc_event_id = { CN_IDX_PROC, CN_VAL_PROC }; |
43 | |
44 | /* proc_event_counts is used as the sequence number of the netlink message */ |
45 | static DEFINE_PER_CPU(__u32, proc_event_counts) = { 0 }; |
46 | |
47 | static inline void get_seq(__u32 *ts, int *cpu) |
48 | { |
49 | preempt_disable(); |
50 | *ts = __this_cpu_inc_return(proc_event_counts) - 1; |
51 | *cpu = smp_processor_id(); |
52 | preempt_enable(); |
53 | } |
54 | |
55 | void proc_fork_connector(struct task_struct *task) |
56 | { |
57 | struct cn_msg *msg; |
58 | struct proc_event *ev; |
59 | __u8 buffer[CN_PROC_MSG_SIZE]; |
60 | struct timespec ts; |
61 | struct task_struct *parent; |
62 | |
63 | if (atomic_read(&proc_event_num_listeners) < 1) |
64 | return; |
65 | |
66 | msg = (struct cn_msg *)buffer; |
67 | ev = (struct proc_event *)msg->data; |
68 | get_seq(&msg->seq, &ev->cpu); |
69 | ktime_get_ts(&ts); /* get high res monotonic timestamp */ |
70 | put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns); |
71 | ev->what = PROC_EVENT_FORK; |
72 | rcu_read_lock(); |
73 | parent = rcu_dereference(task->real_parent); |
74 | ev->event_data.fork.parent_pid = parent->pid; |
75 | ev->event_data.fork.parent_tgid = parent->tgid; |
76 | rcu_read_unlock(); |
77 | ev->event_data.fork.child_pid = task->pid; |
78 | ev->event_data.fork.child_tgid = task->tgid; |
79 | |
80 | memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id)); |
81 | msg->ack = 0; /* not used */ |
82 | msg->len = sizeof(*ev); |
83 | /* If cn_netlink_send() failed, the data is not sent */ |
84 | cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL); |
85 | } |
86 | |
87 | void proc_exec_connector(struct task_struct *task) |
88 | { |
89 | struct cn_msg *msg; |
90 | struct proc_event *ev; |
91 | struct timespec ts; |
92 | __u8 buffer[CN_PROC_MSG_SIZE]; |
93 | |
94 | if (atomic_read(&proc_event_num_listeners) < 1) |
95 | return; |
96 | |
97 | msg = (struct cn_msg *)buffer; |
98 | ev = (struct proc_event *)msg->data; |
99 | get_seq(&msg->seq, &ev->cpu); |
100 | ktime_get_ts(&ts); /* get high res monotonic timestamp */ |
101 | put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns); |
102 | ev->what = PROC_EVENT_EXEC; |
103 | ev->event_data.exec.process_pid = task->pid; |
104 | ev->event_data.exec.process_tgid = task->tgid; |
105 | |
106 | memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id)); |
107 | msg->ack = 0; /* not used */ |
108 | msg->len = sizeof(*ev); |
109 | cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL); |
110 | } |
111 | |
112 | void proc_id_connector(struct task_struct *task, int which_id) |
113 | { |
114 | struct cn_msg *msg; |
115 | struct proc_event *ev; |
116 | __u8 buffer[CN_PROC_MSG_SIZE]; |
117 | struct timespec ts; |
118 | const struct cred *cred; |
119 | |
120 | if (atomic_read(&proc_event_num_listeners) < 1) |
121 | return; |
122 | |
123 | msg = (struct cn_msg *)buffer; |
124 | ev = (struct proc_event *)msg->data; |
125 | ev->what = which_id; |
126 | ev->event_data.id.process_pid = task->pid; |
127 | ev->event_data.id.process_tgid = task->tgid; |
128 | rcu_read_lock(); |
129 | cred = __task_cred(task); |
130 | if (which_id == PROC_EVENT_UID) { |
131 | ev->event_data.id.r.ruid = from_kuid_munged(&init_user_ns, cred->uid); |
132 | ev->event_data.id.e.euid = from_kuid_munged(&init_user_ns, cred->euid); |
133 | } else if (which_id == PROC_EVENT_GID) { |
134 | ev->event_data.id.r.rgid = from_kgid_munged(&init_user_ns, cred->gid); |
135 | ev->event_data.id.e.egid = from_kgid_munged(&init_user_ns, cred->egid); |
136 | } else { |
137 | rcu_read_unlock(); |
138 | return; |
139 | } |
140 | rcu_read_unlock(); |
141 | get_seq(&msg->seq, &ev->cpu); |
142 | ktime_get_ts(&ts); /* get high res monotonic timestamp */ |
143 | put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns); |
144 | |
145 | memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id)); |
146 | msg->ack = 0; /* not used */ |
147 | msg->len = sizeof(*ev); |
148 | cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL); |
149 | } |
150 | |
151 | void proc_sid_connector(struct task_struct *task) |
152 | { |
153 | struct cn_msg *msg; |
154 | struct proc_event *ev; |
155 | struct timespec ts; |
156 | __u8 buffer[CN_PROC_MSG_SIZE]; |
157 | |
158 | if (atomic_read(&proc_event_num_listeners) < 1) |
159 | return; |
160 | |
161 | msg = (struct cn_msg *)buffer; |
162 | ev = (struct proc_event *)msg->data; |
163 | get_seq(&msg->seq, &ev->cpu); |
164 | ktime_get_ts(&ts); /* get high res monotonic timestamp */ |
165 | put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns); |
166 | ev->what = PROC_EVENT_SID; |
167 | ev->event_data.sid.process_pid = task->pid; |
168 | ev->event_data.sid.process_tgid = task->tgid; |
169 | |
170 | memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id)); |
171 | msg->ack = 0; /* not used */ |
172 | msg->len = sizeof(*ev); |
173 | cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL); |
174 | } |
175 | |
176 | void proc_ptrace_connector(struct task_struct *task, int ptrace_id) |
177 | { |
178 | struct cn_msg *msg; |
179 | struct proc_event *ev; |
180 | struct timespec ts; |
181 | __u8 buffer[CN_PROC_MSG_SIZE]; |
182 | |
183 | if (atomic_read(&proc_event_num_listeners) < 1) |
184 | return; |
185 | |
186 | msg = (struct cn_msg *)buffer; |
187 | ev = (struct proc_event *)msg->data; |
188 | get_seq(&msg->seq, &ev->cpu); |
189 | ktime_get_ts(&ts); /* get high res monotonic timestamp */ |
190 | put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns); |
191 | ev->what = PROC_EVENT_PTRACE; |
192 | ev->event_data.ptrace.process_pid = task->pid; |
193 | ev->event_data.ptrace.process_tgid = task->tgid; |
194 | if (ptrace_id == PTRACE_ATTACH) { |
195 | ev->event_data.ptrace.tracer_pid = current->pid; |
196 | ev->event_data.ptrace.tracer_tgid = current->tgid; |
197 | } else if (ptrace_id == PTRACE_DETACH) { |
198 | ev->event_data.ptrace.tracer_pid = 0; |
199 | ev->event_data.ptrace.tracer_tgid = 0; |
200 | } else |
201 | return; |
202 | |
203 | memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id)); |
204 | msg->ack = 0; /* not used */ |
205 | msg->len = sizeof(*ev); |
206 | cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL); |
207 | } |
208 | |
209 | void proc_comm_connector(struct task_struct *task) |
210 | { |
211 | struct cn_msg *msg; |
212 | struct proc_event *ev; |
213 | struct timespec ts; |
214 | __u8 buffer[CN_PROC_MSG_SIZE]; |
215 | |
216 | if (atomic_read(&proc_event_num_listeners) < 1) |
217 | return; |
218 | |
219 | msg = (struct cn_msg *)buffer; |
220 | ev = (struct proc_event *)msg->data; |
221 | get_seq(&msg->seq, &ev->cpu); |
222 | ktime_get_ts(&ts); /* get high res monotonic timestamp */ |
223 | put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns); |
224 | ev->what = PROC_EVENT_COMM; |
225 | ev->event_data.comm.process_pid = task->pid; |
226 | ev->event_data.comm.process_tgid = task->tgid; |
227 | get_task_comm(ev->event_data.comm.comm, task); |
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 | void proc_exit_connector(struct task_struct *task) |
236 | { |
237 | struct cn_msg *msg; |
238 | struct proc_event *ev; |
239 | __u8 buffer[CN_PROC_MSG_SIZE]; |
240 | struct timespec ts; |
241 | |
242 | if (atomic_read(&proc_event_num_listeners) < 1) |
243 | return; |
244 | |
245 | msg = (struct cn_msg *)buffer; |
246 | ev = (struct proc_event *)msg->data; |
247 | get_seq(&msg->seq, &ev->cpu); |
248 | ktime_get_ts(&ts); /* get high res monotonic timestamp */ |
249 | put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns); |
250 | ev->what = PROC_EVENT_EXIT; |
251 | ev->event_data.exit.process_pid = task->pid; |
252 | ev->event_data.exit.process_tgid = task->tgid; |
253 | ev->event_data.exit.exit_code = task->exit_code; |
254 | ev->event_data.exit.exit_signal = task->exit_signal; |
255 | |
256 | memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id)); |
257 | msg->ack = 0; /* not used */ |
258 | msg->len = sizeof(*ev); |
259 | cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL); |
260 | } |
261 | |
262 | /* |
263 | * Send an acknowledgement message to userspace |
264 | * |
265 | * Use 0 for success, EFOO otherwise. |
266 | * Note: this is the negative of conventional kernel error |
267 | * values because it's not being returned via syscall return |
268 | * mechanisms. |
269 | */ |
270 | static void cn_proc_ack(int err, int rcvd_seq, int rcvd_ack) |
271 | { |
272 | struct cn_msg *msg; |
273 | struct proc_event *ev; |
274 | __u8 buffer[CN_PROC_MSG_SIZE]; |
275 | struct timespec ts; |
276 | |
277 | if (atomic_read(&proc_event_num_listeners) < 1) |
278 | return; |
279 | |
280 | msg = (struct cn_msg *)buffer; |
281 | ev = (struct proc_event *)msg->data; |
282 | msg->seq = rcvd_seq; |
283 | ktime_get_ts(&ts); /* get high res monotonic timestamp */ |
284 | put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns); |
285 | ev->cpu = -1; |
286 | ev->what = PROC_EVENT_NONE; |
287 | ev->event_data.ack.err = err; |
288 | memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id)); |
289 | msg->ack = rcvd_ack + 1; |
290 | msg->len = sizeof(*ev); |
291 | cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL); |
292 | } |
293 | |
294 | /** |
295 | * cn_proc_mcast_ctl |
296 | * @data: message sent from userspace via the connector |
297 | */ |
298 | static void cn_proc_mcast_ctl(struct cn_msg *msg, |
299 | struct netlink_skb_parms *nsp) |
300 | { |
301 | enum proc_cn_mcast_op *mc_op = NULL; |
302 | int err = 0; |
303 | |
304 | if (msg->len != sizeof(*mc_op)) |
305 | return; |
306 | |
307 | /* |
308 | * Events are reported with respect to the initial pid |
309 | * and user namespaces so ignore requestors from |
310 | * other namespaces. |
311 | */ |
312 | if ((current_user_ns() != &init_user_ns) || |
313 | (task_active_pid_ns(current) != &init_pid_ns)) |
314 | return; |
315 | |
316 | /* Can only change if privileged. */ |
317 | if (!capable(CAP_NET_ADMIN)) { |
318 | err = EPERM; |
319 | goto out; |
320 | } |
321 | |
322 | mc_op = (enum proc_cn_mcast_op *)msg->data; |
323 | switch (*mc_op) { |
324 | case PROC_CN_MCAST_LISTEN: |
325 | atomic_inc(&proc_event_num_listeners); |
326 | break; |
327 | case PROC_CN_MCAST_IGNORE: |
328 | atomic_dec(&proc_event_num_listeners); |
329 | break; |
330 | default: |
331 | err = EINVAL; |
332 | break; |
333 | } |
334 | |
335 | out: |
336 | cn_proc_ack(err, msg->seq, msg->ack); |
337 | } |
338 | |
339 | /* |
340 | * cn_proc_init - initialization entry point |
341 | * |
342 | * Adds the connector callback to the connector driver. |
343 | */ |
344 | static int __init cn_proc_init(void) |
345 | { |
346 | int err = cn_add_callback(&cn_proc_event_id, |
347 | "cn_proc", |
348 | &cn_proc_mcast_ctl); |
349 | if (err) { |
350 | pr_warn("cn_proc failed to register\n"); |
351 | return err; |
352 | } |
353 | return 0; |
354 | } |
355 | |
356 | module_init(cn_proc_init); |
357 |
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