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#include <linux/pid_namespace.h>
34
35#include <asm/unaligned.h>
36
37#include <linux/cn_proc.h>
38
39#define CN_PROC_MSG_SIZE (sizeof(struct cn_msg) + sizeof(struct proc_event))
40
41static atomic_t proc_event_num_listeners = ATOMIC_INIT(0);
42static struct cb_id cn_proc_event_id = { CN_IDX_PROC, CN_VAL_PROC };
43
44/* proc_event_counts is used as the sequence number of the netlink message */
45static DEFINE_PER_CPU(__u32, proc_event_counts) = { 0 };
46
47static inline void get_seq(__u32 *ts, int *cpu)
48{
49    preempt_disable();
50    *ts = __this_cpu_inc_return(proc_event_counts) - 1;
51    *cpu = smp_processor_id();
52    preempt_enable();
53}
54
55void 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];
60    struct timespec ts;
61    struct task_struct *parent;
62
63    if (atomic_read(&proc_event_num_listeners) < 1)
64        return;
65
66    msg = (struct cn_msg *)buffer;
67    ev = (struct proc_event *)msg->data;
68    get_seq(&msg->seq, &ev->cpu);
69    ktime_get_ts(&ts); /* get high res monotonic timestamp */
70    put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns);
71    ev->what = PROC_EVENT_FORK;
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();
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
87void proc_exec_connector(struct task_struct *task)
88{
89    struct cn_msg *msg;
90    struct proc_event *ev;
91    struct timespec ts;
92    __u8 buffer[CN_PROC_MSG_SIZE];
93
94    if (atomic_read(&proc_event_num_listeners) < 1)
95        return;
96
97    msg = (struct cn_msg *)buffer;
98    ev = (struct proc_event *)msg->data;
99    get_seq(&msg->seq, &ev->cpu);
100    ktime_get_ts(&ts); /* get high res monotonic timestamp */
101    put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns);
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
112void 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];
117    struct timespec ts;
118    const struct cred *cred;
119
120    if (atomic_read(&proc_event_num_listeners) < 1)
121        return;
122
123    msg = (struct cn_msg *)buffer;
124    ev = (struct proc_event *)msg->data;
125    ev->what = which_id;
126    ev->event_data.id.process_pid = task->pid;
127    ev->event_data.id.process_tgid = task->tgid;
128    rcu_read_lock();
129    cred = __task_cred(task);
130    if (which_id == PROC_EVENT_UID) {
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);
133    } else if (which_id == PROC_EVENT_GID) {
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);
136    } else {
137        rcu_read_unlock();
138        return;
139    }
140    rcu_read_unlock();
141    get_seq(&msg->seq, &ev->cpu);
142    ktime_get_ts(&ts); /* get high res monotonic timestamp */
143    put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns);
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
151void 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
176void 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];
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
209void 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
235void 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];
240    struct timespec ts;
241
242    if (atomic_read(&proc_event_num_listeners) < 1)
243        return;
244
245    msg = (struct cn_msg *)buffer;
246    ev = (struct proc_event *)msg->data;
247    get_seq(&msg->seq, &ev->cpu);
248    ktime_get_ts(&ts); /* get high res monotonic timestamp */
249    put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns);
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 */
270static 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];
275    struct timespec ts;
276
277    if (atomic_read(&proc_event_num_listeners) < 1)
278        return;
279
280    msg = (struct cn_msg *)buffer;
281    ev = (struct proc_event *)msg->data;
282    msg->seq = rcvd_seq;
283    ktime_get_ts(&ts); /* get high res monotonic timestamp */
284    put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns);
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 */
298static void cn_proc_mcast_ctl(struct cn_msg *msg,
299                  struct netlink_skb_parms *nsp)
300{
301    enum proc_cn_mcast_op *mc_op = NULL;
302    int err = 0;
303
304    if (msg->len != sizeof(*mc_op))
305        return;
306
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
316    /* Can only change if privileged. */
317    if (!capable(CAP_NET_ADMIN)) {
318        err = EPERM;
319        goto out;
320    }
321
322    mc_op = (enum proc_cn_mcast_op *)msg->data;
323    switch (*mc_op) {
324    case PROC_CN_MCAST_LISTEN:
325        atomic_inc(&proc_event_num_listeners);
326        break;
327    case PROC_CN_MCAST_IGNORE:
328        atomic_dec(&proc_event_num_listeners);
329        break;
330    default:
331        err = EINVAL;
332        break;
333    }
334
335out:
336    cn_proc_ack(err, msg->seq, msg->ack);
337}
338
339/*
340 * cn_proc_init - initialization entry point
341 *
342 * Adds the connector callback to the connector driver.
343 */
344static int __init cn_proc_init(void)
345{
346    int err = cn_add_callback(&cn_proc_event_id,
347                  "cn_proc",
348                  &cn_proc_mcast_ctl);
349    if (err) {
350        pr_warn("cn_proc failed to register\n");
351        return err;
352    }
353    return 0;
354}
355
356module_init(cn_proc_init);
357

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