2 * cn_proc.c - process events connector
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.
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.
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.
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
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 <asm/atomic.h>
33 #include <asm/unaligned.h>
35 #include <linux/cn_proc.h>
37 #define CN_PROC_MSG_SIZE (sizeof(struct cn_msg) + sizeof(struct proc_event))
39 static atomic_t proc_event_num_listeners = ATOMIC_INIT(0);
40 static struct cb_id cn_proc_event_id = { CN_IDX_PROC, CN_VAL_PROC };
42 /* proc_event_counts is used as the sequence number of the netlink message */
43 static DEFINE_PER_CPU(__u32, proc_event_counts) = { 0 };
45 static inline void get_seq(__u32 *ts, int *cpu)
48 *ts = __this_cpu_inc_return(proc_event_counts) -1;
49 *cpu = smp_processor_id();
53 void proc_fork_connector(struct task_struct *task)
56 struct proc_event *ev;
57 __u8 buffer[CN_PROC_MSG_SIZE];
60 if (atomic_read(&proc_event_num_listeners) < 1)
63 msg = (struct cn_msg*)buffer;
64 ev = (struct proc_event*)msg->data;
65 get_seq(&msg->seq, &ev->cpu);
66 ktime_get_ts(&ts); /* get high res monotonic timestamp */
67 put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns);
68 ev->what = PROC_EVENT_FORK;
69 ev->event_data.fork.parent_pid = task->real_parent->pid;
70 ev->event_data.fork.parent_tgid = task->real_parent->tgid;
71 ev->event_data.fork.child_pid = task->pid;
72 ev->event_data.fork.child_tgid = task->tgid;
74 memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
75 msg->ack = 0; /* not used */
76 msg->len = sizeof(*ev);
77 /* If cn_netlink_send() failed, the data is not sent */
78 cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
81 void proc_exec_connector(struct task_struct *task)
84 struct proc_event *ev;
86 __u8 buffer[CN_PROC_MSG_SIZE];
88 if (atomic_read(&proc_event_num_listeners) < 1)
91 msg = (struct cn_msg*)buffer;
92 ev = (struct proc_event*)msg->data;
93 get_seq(&msg->seq, &ev->cpu);
94 ktime_get_ts(&ts); /* get high res monotonic timestamp */
95 put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns);
96 ev->what = PROC_EVENT_EXEC;
97 ev->event_data.exec.process_pid = task->pid;
98 ev->event_data.exec.process_tgid = task->tgid;
100 memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
101 msg->ack = 0; /* not used */
102 msg->len = sizeof(*ev);
103 cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
106 void proc_id_connector(struct task_struct *task, int which_id)
109 struct proc_event *ev;
110 __u8 buffer[CN_PROC_MSG_SIZE];
112 const struct cred *cred;
114 if (atomic_read(&proc_event_num_listeners) < 1)
117 msg = (struct cn_msg*)buffer;
118 ev = (struct proc_event*)msg->data;
120 ev->event_data.id.process_pid = task->pid;
121 ev->event_data.id.process_tgid = task->tgid;
123 cred = __task_cred(task);
124 if (which_id == PROC_EVENT_UID) {
125 ev->event_data.id.r.ruid = cred->uid;
126 ev->event_data.id.e.euid = cred->euid;
127 } else if (which_id == PROC_EVENT_GID) {
128 ev->event_data.id.r.rgid = cred->gid;
129 ev->event_data.id.e.egid = cred->egid;
135 get_seq(&msg->seq, &ev->cpu);
136 ktime_get_ts(&ts); /* get high res monotonic timestamp */
137 put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns);
139 memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
140 msg->ack = 0; /* not used */
141 msg->len = sizeof(*ev);
142 cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
145 void proc_sid_connector(struct task_struct *task)
148 struct proc_event *ev;
150 __u8 buffer[CN_PROC_MSG_SIZE];
152 if (atomic_read(&proc_event_num_listeners) < 1)
155 msg = (struct cn_msg *)buffer;
156 ev = (struct proc_event *)msg->data;
157 get_seq(&msg->seq, &ev->cpu);
158 ktime_get_ts(&ts); /* get high res monotonic timestamp */
159 put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns);
160 ev->what = PROC_EVENT_SID;
161 ev->event_data.sid.process_pid = task->pid;
162 ev->event_data.sid.process_tgid = task->tgid;
164 memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
165 msg->ack = 0; /* not used */
166 msg->len = sizeof(*ev);
167 cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
170 void proc_ptrace_connector(struct task_struct *task, int ptrace_id)
173 struct proc_event *ev;
175 __u8 buffer[CN_PROC_MSG_SIZE];
176 struct task_struct *tracer;
178 if (atomic_read(&proc_event_num_listeners) < 1)
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;
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);
204 void proc_exit_connector(struct task_struct *task)
207 struct proc_event *ev;
208 __u8 buffer[CN_PROC_MSG_SIZE];
211 if (atomic_read(&proc_event_num_listeners) < 1)
214 msg = (struct cn_msg*)buffer;
215 ev = (struct proc_event*)msg->data;
216 get_seq(&msg->seq, &ev->cpu);
217 ktime_get_ts(&ts); /* get high res monotonic timestamp */
218 put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns);
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;
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);
232 * Send an acknowledgement message to userspace
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
239 static void cn_proc_ack(int err, int rcvd_seq, int rcvd_ack)
242 struct proc_event *ev;
243 __u8 buffer[CN_PROC_MSG_SIZE];
246 if (atomic_read(&proc_event_num_listeners) < 1)
249 msg = (struct cn_msg*)buffer;
250 ev = (struct proc_event*)msg->data;
252 ktime_get_ts(&ts); /* get high res monotonic timestamp */
253 put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns);
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);
265 * @data: message sent from userspace via the connector
267 static void cn_proc_mcast_ctl(struct cn_msg *msg,
268 struct netlink_skb_parms *nsp)
270 enum proc_cn_mcast_op *mc_op = NULL;
273 if (msg->len != sizeof(*mc_op))
276 mc_op = (enum proc_cn_mcast_op*)msg->data;
278 case PROC_CN_MCAST_LISTEN:
279 atomic_inc(&proc_event_num_listeners);
281 case PROC_CN_MCAST_IGNORE:
282 atomic_dec(&proc_event_num_listeners);
288 cn_proc_ack(err, msg->seq, msg->ack);
292 * cn_proc_init - initialization entry point
294 * Adds the connector callback to the connector driver.
296 static int __init cn_proc_init(void)
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");
308 module_init(cn_proc_init);