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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; |
9f46080c MH |
60 | |
61 | if (atomic_read(&proc_event_num_listeners) < 1) | |
62 | return; | |
63 | ||
64 | msg = (struct cn_msg*)buffer; | |
65 | ev = (struct proc_event*)msg->data; | |
66 | get_seq(&msg->seq, &ev->cpu); | |
822cfbff | 67 | ktime_get_ts(&ts); /* get high res monotonic timestamp */ |
af3e095a | 68 | put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns); |
9f46080c MH |
69 | ev->what = PROC_EVENT_FORK; |
70 | ev->event_data.fork.parent_pid = task->real_parent->pid; | |
71 | ev->event_data.fork.parent_tgid = task->real_parent->tgid; | |
72 | ev->event_data.fork.child_pid = task->pid; | |
73 | ev->event_data.fork.child_tgid = task->tgid; | |
74 | ||
75 | memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id)); | |
76 | msg->ack = 0; /* not used */ | |
77 | msg->len = sizeof(*ev); | |
78 | /* If cn_netlink_send() failed, the data is not sent */ | |
79 | cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL); | |
80 | } | |
81 | ||
82 | void proc_exec_connector(struct task_struct *task) | |
83 | { | |
84 | struct cn_msg *msg; | |
85 | struct proc_event *ev; | |
822cfbff | 86 | struct timespec ts; |
9f46080c MH |
87 | __u8 buffer[CN_PROC_MSG_SIZE]; |
88 | ||
89 | if (atomic_read(&proc_event_num_listeners) < 1) | |
90 | return; | |
91 | ||
92 | msg = (struct cn_msg*)buffer; | |
93 | ev = (struct proc_event*)msg->data; | |
94 | get_seq(&msg->seq, &ev->cpu); | |
822cfbff | 95 | ktime_get_ts(&ts); /* get high res monotonic timestamp */ |
af3e095a | 96 | put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns); |
9f46080c MH |
97 | ev->what = PROC_EVENT_EXEC; |
98 | ev->event_data.exec.process_pid = task->pid; | |
99 | ev->event_data.exec.process_tgid = task->tgid; | |
100 | ||
101 | memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id)); | |
102 | msg->ack = 0; /* not used */ | |
103 | msg->len = sizeof(*ev); | |
104 | cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL); | |
105 | } | |
106 | ||
107 | void proc_id_connector(struct task_struct *task, int which_id) | |
108 | { | |
109 | struct cn_msg *msg; | |
110 | struct proc_event *ev; | |
111 | __u8 buffer[CN_PROC_MSG_SIZE]; | |
822cfbff | 112 | struct timespec ts; |
c69e8d9c | 113 | const struct cred *cred; |
9f46080c MH |
114 | |
115 | if (atomic_read(&proc_event_num_listeners) < 1) | |
116 | return; | |
117 | ||
118 | msg = (struct cn_msg*)buffer; | |
119 | ev = (struct proc_event*)msg->data; | |
120 | ev->what = which_id; | |
121 | ev->event_data.id.process_pid = task->pid; | |
122 | ev->event_data.id.process_tgid = task->tgid; | |
c69e8d9c DH |
123 | rcu_read_lock(); |
124 | cred = __task_cred(task); | |
9f46080c | 125 | if (which_id == PROC_EVENT_UID) { |
c69e8d9c DH |
126 | ev->event_data.id.r.ruid = cred->uid; |
127 | ev->event_data.id.e.euid = cred->euid; | |
9f46080c | 128 | } else if (which_id == PROC_EVENT_GID) { |
c69e8d9c DH |
129 | ev->event_data.id.r.rgid = cred->gid; |
130 | ev->event_data.id.e.egid = cred->egid; | |
131 | } else { | |
132 | rcu_read_unlock(); | |
9f46080c | 133 | return; |
c69e8d9c DH |
134 | } |
135 | rcu_read_unlock(); | |
9f46080c | 136 | get_seq(&msg->seq, &ev->cpu); |
822cfbff | 137 | ktime_get_ts(&ts); /* get high res monotonic timestamp */ |
af3e095a | 138 | put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns); |
9f46080c MH |
139 | |
140 | memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id)); | |
141 | msg->ack = 0; /* not used */ | |
142 | msg->len = sizeof(*ev); | |
143 | cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL); | |
144 | } | |
145 | ||
02b51df1 SJR |
146 | void proc_sid_connector(struct task_struct *task) |
147 | { | |
148 | struct cn_msg *msg; | |
149 | struct proc_event *ev; | |
150 | struct timespec ts; | |
151 | __u8 buffer[CN_PROC_MSG_SIZE]; | |
152 | ||
153 | if (atomic_read(&proc_event_num_listeners) < 1) | |
154 | return; | |
155 | ||
156 | msg = (struct cn_msg *)buffer; | |
157 | ev = (struct proc_event *)msg->data; | |
158 | get_seq(&msg->seq, &ev->cpu); | |
159 | ktime_get_ts(&ts); /* get high res monotonic timestamp */ | |
160 | put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns); | |
161 | ev->what = PROC_EVENT_SID; | |
162 | ev->event_data.sid.process_pid = task->pid; | |
163 | ev->event_data.sid.process_tgid = task->tgid; | |
164 | ||
165 | memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id)); | |
166 | msg->ack = 0; /* not used */ | |
167 | msg->len = sizeof(*ev); | |
168 | cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL); | |
169 | } | |
170 | ||
f701e5b7 VZ |
171 | void proc_ptrace_connector(struct task_struct *task, int ptrace_id) |
172 | { | |
173 | struct cn_msg *msg; | |
174 | struct proc_event *ev; | |
175 | struct timespec ts; | |
176 | __u8 buffer[CN_PROC_MSG_SIZE]; | |
f701e5b7 VZ |
177 | |
178 | if (atomic_read(&proc_event_num_listeners) < 1) | |
179 | return; | |
180 | ||
181 | msg = (struct cn_msg *)buffer; | |
182 | ev = (struct proc_event *)msg->data; | |
183 | get_seq(&msg->seq, &ev->cpu); | |
184 | ktime_get_ts(&ts); /* get high res monotonic timestamp */ | |
185 | put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns); | |
186 | ev->what = PROC_EVENT_PTRACE; | |
187 | ev->event_data.ptrace.process_pid = task->pid; | |
188 | ev->event_data.ptrace.process_tgid = task->tgid; | |
189 | if (ptrace_id == PTRACE_ATTACH) { | |
190 | ev->event_data.ptrace.tracer_pid = current->pid; | |
191 | ev->event_data.ptrace.tracer_tgid = current->tgid; | |
192 | } else if (ptrace_id == PTRACE_DETACH) { | |
193 | ev->event_data.ptrace.tracer_pid = 0; | |
194 | ev->event_data.ptrace.tracer_tgid = 0; | |
195 | } else | |
196 | return; | |
197 | ||
198 | memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id)); | |
199 | msg->ack = 0; /* not used */ | |
200 | msg->len = sizeof(*ev); | |
201 | cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL); | |
202 | } | |
203 | ||
9f46080c MH |
204 | void proc_exit_connector(struct task_struct *task) |
205 | { | |
206 | struct cn_msg *msg; | |
207 | struct proc_event *ev; | |
208 | __u8 buffer[CN_PROC_MSG_SIZE]; | |
822cfbff | 209 | struct timespec ts; |
9f46080c MH |
210 | |
211 | if (atomic_read(&proc_event_num_listeners) < 1) | |
212 | return; | |
213 | ||
214 | msg = (struct cn_msg*)buffer; | |
215 | ev = (struct proc_event*)msg->data; | |
216 | get_seq(&msg->seq, &ev->cpu); | |
822cfbff | 217 | ktime_get_ts(&ts); /* get high res monotonic timestamp */ |
af3e095a | 218 | put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns); |
9f46080c MH |
219 | ev->what = PROC_EVENT_EXIT; |
220 | ev->event_data.exit.process_pid = task->pid; | |
221 | ev->event_data.exit.process_tgid = task->tgid; | |
222 | ev->event_data.exit.exit_code = task->exit_code; | |
223 | ev->event_data.exit.exit_signal = task->exit_signal; | |
224 | ||
225 | memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id)); | |
226 | msg->ack = 0; /* not used */ | |
227 | msg->len = sizeof(*ev); | |
228 | cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL); | |
229 | } | |
230 | ||
231 | /* | |
232 | * Send an acknowledgement message to userspace | |
233 | * | |
234 | * Use 0 for success, EFOO otherwise. | |
235 | * Note: this is the negative of conventional kernel error | |
236 | * values because it's not being returned via syscall return | |
237 | * mechanisms. | |
238 | */ | |
239 | static void cn_proc_ack(int err, int rcvd_seq, int rcvd_ack) | |
240 | { | |
241 | struct cn_msg *msg; | |
242 | struct proc_event *ev; | |
243 | __u8 buffer[CN_PROC_MSG_SIZE]; | |
822cfbff | 244 | struct timespec ts; |
9f46080c MH |
245 | |
246 | if (atomic_read(&proc_event_num_listeners) < 1) | |
247 | return; | |
248 | ||
249 | msg = (struct cn_msg*)buffer; | |
250 | ev = (struct proc_event*)msg->data; | |
251 | msg->seq = rcvd_seq; | |
822cfbff | 252 | ktime_get_ts(&ts); /* get high res monotonic timestamp */ |
af3e095a | 253 | put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns); |
9f46080c MH |
254 | ev->cpu = -1; |
255 | ev->what = PROC_EVENT_NONE; | |
256 | ev->event_data.ack.err = err; | |
257 | memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id)); | |
258 | msg->ack = rcvd_ack + 1; | |
259 | msg->len = sizeof(*ev); | |
260 | cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL); | |
261 | } | |
262 | ||
263 | /** | |
264 | * cn_proc_mcast_ctl | |
265 | * @data: message sent from userspace via the connector | |
266 | */ | |
f0b25932 SB |
267 | static void cn_proc_mcast_ctl(struct cn_msg *msg, |
268 | struct netlink_skb_parms *nsp) | |
9f46080c | 269 | { |
9f46080c MH |
270 | enum proc_cn_mcast_op *mc_op = NULL; |
271 | int err = 0; | |
272 | ||
273 | if (msg->len != sizeof(*mc_op)) | |
274 | return; | |
275 | ||
276 | mc_op = (enum proc_cn_mcast_op*)msg->data; | |
277 | switch (*mc_op) { | |
278 | case PROC_CN_MCAST_LISTEN: | |
279 | atomic_inc(&proc_event_num_listeners); | |
280 | break; | |
281 | case PROC_CN_MCAST_IGNORE: | |
282 | atomic_dec(&proc_event_num_listeners); | |
283 | break; | |
284 | default: | |
285 | err = EINVAL; | |
286 | break; | |
287 | } | |
288 | cn_proc_ack(err, msg->seq, msg->ack); | |
289 | } | |
290 | ||
291 | /* | |
292 | * cn_proc_init - initialization entry point | |
293 | * | |
294 | * Adds the connector callback to the connector driver. | |
295 | */ | |
296 | static int __init cn_proc_init(void) | |
297 | { | |
298 | int err; | |
299 | ||
300 | if ((err = cn_add_callback(&cn_proc_event_id, "cn_proc", | |
301 | &cn_proc_mcast_ctl))) { | |
302 | printk(KERN_WARNING "cn_proc failed to register\n"); | |
303 | return err; | |
304 | } | |
305 | return 0; | |
306 | } | |
307 | ||
308 | module_init(cn_proc_init); |