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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 AS |
32 | #include <linux/atomic.h> |
33 | ||
af3e095a | 34 | #include <asm/unaligned.h> |
9f46080c MH |
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 | ||
cc398c2e | 43 | /* proc_event_counts is used as the sequence number of the netlink message */ |
9f46080c MH |
44 | static DEFINE_PER_CPU(__u32, proc_event_counts) = { 0 }; |
45 | ||
46 | static inline void get_seq(__u32 *ts, int *cpu) | |
47 | { | |
3ea9f683 CL |
48 | preempt_disable(); |
49 | *ts = __this_cpu_inc_return(proc_event_counts) -1; | |
9f46080c | 50 | *cpu = smp_processor_id(); |
3ea9f683 | 51 | preempt_enable(); |
9f46080c MH |
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]; | |
822cfbff | 59 | struct timespec ts; |
9e8f90df | 60 | struct task_struct *parent; |
9f46080c MH |
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); | |
822cfbff | 68 | ktime_get_ts(&ts); /* get high res monotonic timestamp */ |
af3e095a | 69 | put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns); |
9f46080c | 70 | ev->what = PROC_EVENT_FORK; |
9e8f90df ON |
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(); | |
9f46080c MH |
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; | |
822cfbff | 90 | struct timespec ts; |
9f46080c MH |
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); | |
822cfbff | 99 | ktime_get_ts(&ts); /* get high res monotonic timestamp */ |
af3e095a | 100 | put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns); |
9f46080c MH |
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]; | |
822cfbff | 116 | struct timespec ts; |
c69e8d9c | 117 | const struct cred *cred; |
9f46080c MH |
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; | |
c69e8d9c DH |
127 | rcu_read_lock(); |
128 | cred = __task_cred(task); | |
9f46080c | 129 | if (which_id == PROC_EVENT_UID) { |
c69e8d9c DH |
130 | ev->event_data.id.r.ruid = cred->uid; |
131 | ev->event_data.id.e.euid = cred->euid; | |
9f46080c | 132 | } else if (which_id == PROC_EVENT_GID) { |
c69e8d9c DH |
133 | ev->event_data.id.r.rgid = cred->gid; |
134 | ev->event_data.id.e.egid = cred->egid; | |
135 | } else { | |
136 | rcu_read_unlock(); | |
9f46080c | 137 | return; |
c69e8d9c DH |
138 | } |
139 | rcu_read_unlock(); | |
9f46080c | 140 | get_seq(&msg->seq, &ev->cpu); |
822cfbff | 141 | ktime_get_ts(&ts); /* get high res monotonic timestamp */ |
af3e095a | 142 | put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns); |
9f46080c MH |
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 | ||
02b51df1 SJR |
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 | ||
f701e5b7 VZ |
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]; | |
f701e5b7 VZ |
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 | ||
f786ecba VZ |
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 | ||
9f46080c MH |
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]; | |
822cfbff | 239 | struct timespec ts; |
9f46080c MH |
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); | |
822cfbff | 247 | ktime_get_ts(&ts); /* get high res monotonic timestamp */ |
af3e095a | 248 | put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns); |
9f46080c MH |
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]; | |
822cfbff | 274 | struct timespec ts; |
9f46080c MH |
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; | |
822cfbff | 282 | ktime_get_ts(&ts); /* get high res monotonic timestamp */ |
af3e095a | 283 | put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns); |
9f46080c MH |
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 | */ | |
f0b25932 SB |
297 | static void cn_proc_mcast_ctl(struct cn_msg *msg, |
298 | struct netlink_skb_parms *nsp) | |
9f46080c | 299 | { |
9f46080c MH |
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; | |
329 | ||
330 | if ((err = cn_add_callback(&cn_proc_event_id, "cn_proc", | |
331 | &cn_proc_mcast_ctl))) { | |
332 | printk(KERN_WARNING "cn_proc failed to register\n"); | |
333 | return err; | |
334 | } | |
335 | return 0; | |
336 | } | |
337 | ||
338 | module_init(cn_proc_init); |