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Matt Helsley9f460802005-11-07 00:59:16 -08001/*
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>
Matt Helsleycaf3c9d2006-01-09 20:52:40 -080027#include <linux/ktime.h>
Matt Helsley9f460802005-11-07 00:59:16 -080028#include <linux/init.h>
Matt Helsley1d31a4e2006-06-23 02:05:42 -070029#include <linux/connector.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090030#include <linux/gfp.h>
Vladimir Zapolskiyf701e5b2011-07-15 20:45:18 +030031#include <linux/ptrace.h>
Arun Sharma60063492011-07-26 16:09:06 -070032#include <linux/atomic.h>
33
Erik Jacobsonaf3e0952007-01-05 16:37:05 -080034#include <asm/unaligned.h>
Matt Helsley9f460802005-11-07 00:59:16 -080035
36#include <linux/cn_proc.h>
37
38#define CN_PROC_MSG_SIZE (sizeof(struct cn_msg) + sizeof(struct proc_event))
39
40static atomic_t proc_event_num_listeners = ATOMIC_INIT(0);
41static struct cb_id cn_proc_event_id = { CN_IDX_PROC, CN_VAL_PROC };
42
David S. Millercc398c22006-01-08 01:03:34 -080043/* proc_event_counts is used as the sequence number of the netlink message */
Matt Helsley9f460802005-11-07 00:59:16 -080044static DEFINE_PER_CPU(__u32, proc_event_counts) = { 0 };
45
46static inline void get_seq(__u32 *ts, int *cpu)
47{
Christoph Lameter3ea9f682010-12-08 17:42:23 +010048 preempt_disable();
49 *ts = __this_cpu_inc_return(proc_event_counts) -1;
Matt Helsley9f460802005-11-07 00:59:16 -080050 *cpu = smp_processor_id();
Christoph Lameter3ea9f682010-12-08 17:42:23 +010051 preempt_enable();
Matt Helsley9f460802005-11-07 00:59:16 -080052}
53
54void 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];
Chandra Seetharaman822cfbff2006-07-30 03:03:04 -070059 struct timespec ts;
Oleg Nesterov9e8f90d2011-07-28 18:26:32 -070060 struct task_struct *parent;
Matt Helsley9f460802005-11-07 00:59:16 -080061
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);
Chandra Seetharaman822cfbff2006-07-30 03:03:04 -070068 ktime_get_ts(&ts); /* get high res monotonic timestamp */
Erik Jacobsonaf3e0952007-01-05 16:37:05 -080069 put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns);
Matt Helsley9f460802005-11-07 00:59:16 -080070 ev->what = PROC_EVENT_FORK;
Oleg Nesterov9e8f90d2011-07-28 18:26:32 -070071 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();
Matt Helsley9f460802005-11-07 00:59:16 -080076 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
86void proc_exec_connector(struct task_struct *task)
87{
88 struct cn_msg *msg;
89 struct proc_event *ev;
Chandra Seetharaman822cfbff2006-07-30 03:03:04 -070090 struct timespec ts;
Matt Helsley9f460802005-11-07 00:59:16 -080091 __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);
Chandra Seetharaman822cfbff2006-07-30 03:03:04 -070099 ktime_get_ts(&ts); /* get high res monotonic timestamp */
Erik Jacobsonaf3e0952007-01-05 16:37:05 -0800100 put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns);
Matt Helsley9f460802005-11-07 00:59:16 -0800101 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
111void 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];
Chandra Seetharaman822cfbff2006-07-30 03:03:04 -0700116 struct timespec ts;
David Howellsc69e8d92008-11-14 10:39:19 +1100117 const struct cred *cred;
Matt Helsley9f460802005-11-07 00:59:16 -0800118
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;
David Howellsc69e8d92008-11-14 10:39:19 +1100127 rcu_read_lock();
128 cred = __task_cred(task);
Matt Helsley9f460802005-11-07 00:59:16 -0800129 if (which_id == PROC_EVENT_UID) {
David Howellsc69e8d92008-11-14 10:39:19 +1100130 ev->event_data.id.r.ruid = cred->uid;
131 ev->event_data.id.e.euid = cred->euid;
Matt Helsley9f460802005-11-07 00:59:16 -0800132 } else if (which_id == PROC_EVENT_GID) {
David Howellsc69e8d92008-11-14 10:39:19 +1100133 ev->event_data.id.r.rgid = cred->gid;
134 ev->event_data.id.e.egid = cred->egid;
135 } else {
136 rcu_read_unlock();
Matt Helsley9f460802005-11-07 00:59:16 -0800137 return;
David Howellsc69e8d92008-11-14 10:39:19 +1100138 }
139 rcu_read_unlock();
Matt Helsley9f460802005-11-07 00:59:16 -0800140 get_seq(&msg->seq, &ev->cpu);
Chandra Seetharaman822cfbff2006-07-30 03:03:04 -0700141 ktime_get_ts(&ts); /* get high res monotonic timestamp */
Erik Jacobsonaf3e0952007-01-05 16:37:05 -0800142 put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns);
Matt Helsley9f460802005-11-07 00:59:16 -0800143
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
Scott James Remnant02b51df2009-09-22 16:43:44 -0700150void 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
Vladimir Zapolskiyf701e5b2011-07-15 20:45:18 +0300175void 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];
Vladimir Zapolskiyf701e5b2011-07-15 20:45:18 +0300181
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
Vladimir Zapolskiyf786ecb2011-09-21 09:26:44 +0000208void 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
Matt Helsley9f460802005-11-07 00:59:16 -0800234void 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];
Chandra Seetharaman822cfbff2006-07-30 03:03:04 -0700239 struct timespec ts;
Matt Helsley9f460802005-11-07 00:59:16 -0800240
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);
Chandra Seetharaman822cfbff2006-07-30 03:03:04 -0700247 ktime_get_ts(&ts); /* get high res monotonic timestamp */
Erik Jacobsonaf3e0952007-01-05 16:37:05 -0800248 put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns);
Matt Helsley9f460802005-11-07 00:59:16 -0800249 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 */
269static 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];
Chandra Seetharaman822cfbff2006-07-30 03:03:04 -0700274 struct timespec ts;
Matt Helsley9f460802005-11-07 00:59:16 -0800275
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;
Chandra Seetharaman822cfbff2006-07-30 03:03:04 -0700282 ktime_get_ts(&ts); /* get high res monotonic timestamp */
Erik Jacobsonaf3e0952007-01-05 16:37:05 -0800283 put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns);
Matt Helsley9f460802005-11-07 00:59:16 -0800284 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 */
Stephen Boydf0b25932009-10-06 01:39:51 -0700297static void cn_proc_mcast_ctl(struct cn_msg *msg,
298 struct netlink_skb_parms *nsp)
Matt Helsley9f460802005-11-07 00:59:16 -0800299{
Matt Helsley9f460802005-11-07 00:59:16 -0800300 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 */
326static 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
338module_init(cn_proc_init);