Root/drivers/connector/cn_proc.c

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
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
43/* proc_event_counts is used as the sequence number of the netlink message */
44static DEFINE_PER_CPU(__u32, proc_event_counts) = { 0 };
45
46static 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
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];
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
86void 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
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];
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
150void 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
175void 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
208void 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
234void 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 */
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];
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 */
297static 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 */
326static 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
338module_init(cn_proc_init);
339

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