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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 | |
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 | |
40 | static atomic_t proc_event_num_listeners = ATOMIC_INIT(0); |
41 | static 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 */ |
44 | static DEFINE_PER_CPU(__u32, proc_event_counts) = { 0 }; |
45 | |
46 | static 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 | |
54 | void 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 | |
86 | void 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 | |
111 | void 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 | |
150 | void 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 | |
175 | void 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 | |
208 | void proc_comm_connector(struct task_struct *task) |
209 | { |
210 | struct cn_msg *msg; |
211 | struct proc_event *ev; |
212 | struct timespec ts; |
213 | __u8 buffer[CN_PROC_MSG_SIZE]; |
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_COMM; |
224 | ev->event_data.comm.process_pid = task->pid; |
225 | ev->event_data.comm.process_tgid = task->tgid; |
226 | get_task_comm(ev->event_data.comm.comm, task); |
227 | |
228 | memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id)); |
229 | msg->ack = 0; /* not used */ |
230 | msg->len = sizeof(*ev); |
231 | cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL); |
232 | } |
233 | |
234 | void proc_exit_connector(struct task_struct *task) |
235 | { |
236 | struct cn_msg *msg; |
237 | struct proc_event *ev; |
238 | __u8 buffer[CN_PROC_MSG_SIZE]; |
239 | struct timespec ts; |
240 | |
241 | if (atomic_read(&proc_event_num_listeners) < 1) |
242 | return; |
243 | |
244 | msg = (struct cn_msg *)buffer; |
245 | ev = (struct proc_event *)msg->data; |
246 | get_seq(&msg->seq, &ev->cpu); |
247 | ktime_get_ts(&ts); /* get high res monotonic timestamp */ |
248 | put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns); |
249 | ev->what = PROC_EVENT_EXIT; |
250 | ev->event_data.exit.process_pid = task->pid; |
251 | ev->event_data.exit.process_tgid = task->tgid; |
252 | ev->event_data.exit.exit_code = task->exit_code; |
253 | ev->event_data.exit.exit_signal = task->exit_signal; |
254 | |
255 | memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id)); |
256 | msg->ack = 0; /* not used */ |
257 | msg->len = sizeof(*ev); |
258 | cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL); |
259 | } |
260 | |
261 | /* |
262 | * Send an acknowledgement message to userspace |
263 | * |
264 | * Use 0 for success, EFOO otherwise. |
265 | * Note: this is the negative of conventional kernel error |
266 | * values because it's not being returned via syscall return |
267 | * mechanisms. |
268 | */ |
269 | static void cn_proc_ack(int err, int rcvd_seq, int rcvd_ack) |
270 | { |
271 | struct cn_msg *msg; |
272 | struct proc_event *ev; |
273 | __u8 buffer[CN_PROC_MSG_SIZE]; |
274 | struct timespec ts; |
275 | |
276 | if (atomic_read(&proc_event_num_listeners) < 1) |
277 | return; |
278 | |
279 | msg = (struct cn_msg *)buffer; |
280 | ev = (struct proc_event *)msg->data; |
281 | msg->seq = rcvd_seq; |
282 | ktime_get_ts(&ts); /* get high res monotonic timestamp */ |
283 | put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns); |
284 | ev->cpu = -1; |
285 | ev->what = PROC_EVENT_NONE; |
286 | ev->event_data.ack.err = err; |
287 | memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id)); |
288 | msg->ack = rcvd_ack + 1; |
289 | msg->len = sizeof(*ev); |
290 | cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL); |
291 | } |
292 | |
293 | /** |
294 | * cn_proc_mcast_ctl |
295 | * @data: message sent from userspace via the connector |
296 | */ |
297 | static void cn_proc_mcast_ctl(struct cn_msg *msg, |
298 | struct netlink_skb_parms *nsp) |
299 | { |
300 | enum proc_cn_mcast_op *mc_op = NULL; |
301 | int err = 0; |
302 | |
303 | if (msg->len != sizeof(*mc_op)) |
304 | return; |
305 | |
306 | mc_op = (enum proc_cn_mcast_op *)msg->data; |
307 | switch (*mc_op) { |
308 | case PROC_CN_MCAST_LISTEN: |
309 | atomic_inc(&proc_event_num_listeners); |
310 | break; |
311 | case PROC_CN_MCAST_IGNORE: |
312 | atomic_dec(&proc_event_num_listeners); |
313 | break; |
314 | default: |
315 | err = EINVAL; |
316 | break; |
317 | } |
318 | cn_proc_ack(err, msg->seq, msg->ack); |
319 | } |
320 | |
321 | /* |
322 | * cn_proc_init - initialization entry point |
323 | * |
324 | * Adds the connector callback to the connector driver. |
325 | */ |
326 | static int __init cn_proc_init(void) |
327 | { |
328 | int err = cn_add_callback(&cn_proc_event_id, |
329 | "cn_proc", |
330 | &cn_proc_mcast_ctl); |
331 | if (err) { |
332 | pr_warn("cn_proc failed to register\n"); |
333 | return err; |
334 | } |
335 | return 0; |
336 | } |
337 | |
338 | module_init(cn_proc_init); |
339 |
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