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 | |
af3e095a | 35 | #include <asm/unaligned.h> |
9f46080c MH |
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 | ||
cc398c2e | 44 | /* proc_event_counts is used as the sequence number of the netlink message */ |
9f46080c MH |
45 | static DEFINE_PER_CPU(__u32, proc_event_counts) = { 0 }; |
46 | ||
47 | static inline void get_seq(__u32 *ts, int *cpu) | |
48 | { | |
3ea9f683 | 49 | preempt_disable(); |
f3c48ecc | 50 | *ts = __this_cpu_inc_return(proc_event_counts) - 1; |
9f46080c | 51 | *cpu = smp_processor_id(); |
3ea9f683 | 52 | preempt_enable(); |
9f46080c MH |
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]; | |
822cfbff | 60 | struct timespec ts; |
9e8f90df | 61 | struct task_struct *parent; |
9f46080c MH |
62 | |
63 | if (atomic_read(&proc_event_num_listeners) < 1) | |
64 | return; | |
65 | ||
f3c48ecc VI |
66 | msg = (struct cn_msg *)buffer; |
67 | ev = (struct proc_event *)msg->data; | |
9f46080c | 68 | get_seq(&msg->seq, &ev->cpu); |
822cfbff | 69 | ktime_get_ts(&ts); /* get high res monotonic timestamp */ |
af3e095a | 70 | put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns); |
9f46080c | 71 | ev->what = PROC_EVENT_FORK; |
9e8f90df ON |
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(); | |
9f46080c MH |
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; | |
822cfbff | 91 | struct timespec ts; |
9f46080c MH |
92 | __u8 buffer[CN_PROC_MSG_SIZE]; |
93 | ||
94 | if (atomic_read(&proc_event_num_listeners) < 1) | |
95 | return; | |
96 | ||
f3c48ecc VI |
97 | msg = (struct cn_msg *)buffer; |
98 | ev = (struct proc_event *)msg->data; | |
9f46080c | 99 | get_seq(&msg->seq, &ev->cpu); |
822cfbff | 100 | ktime_get_ts(&ts); /* get high res monotonic timestamp */ |
af3e095a | 101 | put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns); |
9f46080c MH |
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]; | |
822cfbff | 117 | struct timespec ts; |
c69e8d9c | 118 | const struct cred *cred; |
9f46080c MH |
119 | |
120 | if (atomic_read(&proc_event_num_listeners) < 1) | |
121 | return; | |
122 | ||
f3c48ecc VI |
123 | msg = (struct cn_msg *)buffer; |
124 | ev = (struct proc_event *)msg->data; | |
9f46080c MH |
125 | ev->what = which_id; |
126 | ev->event_data.id.process_pid = task->pid; | |
127 | ev->event_data.id.process_tgid = task->tgid; | |
c69e8d9c DH |
128 | rcu_read_lock(); |
129 | cred = __task_cred(task); | |
9f46080c | 130 | if (which_id == PROC_EVENT_UID) { |
9582d901 EB |
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); | |
9f46080c | 133 | } else if (which_id == PROC_EVENT_GID) { |
9582d901 EB |
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); | |
c69e8d9c DH |
136 | } else { |
137 | rcu_read_unlock(); | |
f3c48ecc | 138 | return; |
c69e8d9c DH |
139 | } |
140 | rcu_read_unlock(); | |
9f46080c | 141 | get_seq(&msg->seq, &ev->cpu); |
822cfbff | 142 | ktime_get_ts(&ts); /* get high res monotonic timestamp */ |
af3e095a | 143 | put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns); |
9f46080c MH |
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 | ||
02b51df1 SJR |
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 | ||
f701e5b7 VZ |
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]; | |
f701e5b7 VZ |
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 | ||
f786ecba VZ |
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 | ||
9f46080c MH |
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]; | |
822cfbff | 240 | struct timespec ts; |
9f46080c MH |
241 | |
242 | if (atomic_read(&proc_event_num_listeners) < 1) | |
243 | return; | |
244 | ||
f3c48ecc VI |
245 | msg = (struct cn_msg *)buffer; |
246 | ev = (struct proc_event *)msg->data; | |
9f46080c | 247 | get_seq(&msg->seq, &ev->cpu); |
822cfbff | 248 | ktime_get_ts(&ts); /* get high res monotonic timestamp */ |
af3e095a | 249 | put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns); |
9f46080c MH |
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]; | |
822cfbff | 275 | struct timespec ts; |
9f46080c MH |
276 | |
277 | if (atomic_read(&proc_event_num_listeners) < 1) | |
278 | return; | |
279 | ||
f3c48ecc VI |
280 | msg = (struct cn_msg *)buffer; |
281 | ev = (struct proc_event *)msg->data; | |
9f46080c | 282 | msg->seq = rcvd_seq; |
822cfbff | 283 | ktime_get_ts(&ts); /* get high res monotonic timestamp */ |
af3e095a | 284 | put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns); |
9f46080c MH |
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 | */ | |
f0b25932 SB |
298 | static void cn_proc_mcast_ctl(struct cn_msg *msg, |
299 | struct netlink_skb_parms *nsp) | |
9f46080c | 300 | { |
9f46080c MH |
301 | enum proc_cn_mcast_op *mc_op = NULL; |
302 | int err = 0; | |
303 | ||
304 | if (msg->len != sizeof(*mc_op)) | |
305 | return; | |
306 | ||
9582d901 EB |
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 | ||
f3c48ecc | 316 | mc_op = (enum proc_cn_mcast_op *)msg->data; |
9f46080c MH |
317 | switch (*mc_op) { |
318 | case PROC_CN_MCAST_LISTEN: | |
319 | atomic_inc(&proc_event_num_listeners); | |
320 | break; | |
321 | case PROC_CN_MCAST_IGNORE: | |
322 | atomic_dec(&proc_event_num_listeners); | |
323 | break; | |
324 | default: | |
325 | err = EINVAL; | |
326 | break; | |
327 | } | |
328 | cn_proc_ack(err, msg->seq, msg->ack); | |
329 | } | |
330 | ||
331 | /* | |
332 | * cn_proc_init - initialization entry point | |
333 | * | |
334 | * Adds the connector callback to the connector driver. | |
335 | */ | |
336 | static int __init cn_proc_init(void) | |
337 | { | |
f3c48ecc VI |
338 | int err = cn_add_callback(&cn_proc_event_id, |
339 | "cn_proc", | |
340 | &cn_proc_mcast_ctl); | |
341 | if (err) { | |
342 | pr_warn("cn_proc failed to register\n"); | |
9f46080c MH |
343 | return err; |
344 | } | |
345 | return 0; | |
346 | } | |
347 | ||
348 | module_init(cn_proc_init); |