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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> |
9f46080c | 30 | #include <asm/atomic.h> |
af3e095a | 31 | #include <asm/unaligned.h> |
9f46080c MH |
32 | |
33 | #include <linux/cn_proc.h> | |
34 | ||
35 | #define CN_PROC_MSG_SIZE (sizeof(struct cn_msg) + sizeof(struct proc_event)) | |
36 | ||
37 | static atomic_t proc_event_num_listeners = ATOMIC_INIT(0); | |
38 | static struct cb_id cn_proc_event_id = { CN_IDX_PROC, CN_VAL_PROC }; | |
39 | ||
cc398c2e | 40 | /* proc_event_counts is used as the sequence number of the netlink message */ |
9f46080c MH |
41 | static DEFINE_PER_CPU(__u32, proc_event_counts) = { 0 }; |
42 | ||
43 | static inline void get_seq(__u32 *ts, int *cpu) | |
44 | { | |
45 | *ts = get_cpu_var(proc_event_counts)++; | |
46 | *cpu = smp_processor_id(); | |
cc398c2e | 47 | put_cpu_var(proc_event_counts); |
9f46080c MH |
48 | } |
49 | ||
50 | void proc_fork_connector(struct task_struct *task) | |
51 | { | |
52 | struct cn_msg *msg; | |
53 | struct proc_event *ev; | |
54 | __u8 buffer[CN_PROC_MSG_SIZE]; | |
822cfbff | 55 | struct timespec ts; |
9f46080c MH |
56 | |
57 | if (atomic_read(&proc_event_num_listeners) < 1) | |
58 | return; | |
59 | ||
60 | msg = (struct cn_msg*)buffer; | |
61 | ev = (struct proc_event*)msg->data; | |
62 | get_seq(&msg->seq, &ev->cpu); | |
822cfbff | 63 | ktime_get_ts(&ts); /* get high res monotonic timestamp */ |
af3e095a | 64 | put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns); |
9f46080c MH |
65 | ev->what = PROC_EVENT_FORK; |
66 | ev->event_data.fork.parent_pid = task->real_parent->pid; | |
67 | ev->event_data.fork.parent_tgid = task->real_parent->tgid; | |
68 | ev->event_data.fork.child_pid = task->pid; | |
69 | ev->event_data.fork.child_tgid = task->tgid; | |
70 | ||
71 | memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id)); | |
72 | msg->ack = 0; /* not used */ | |
73 | msg->len = sizeof(*ev); | |
74 | /* If cn_netlink_send() failed, the data is not sent */ | |
75 | cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL); | |
76 | } | |
77 | ||
78 | void proc_exec_connector(struct task_struct *task) | |
79 | { | |
80 | struct cn_msg *msg; | |
81 | struct proc_event *ev; | |
822cfbff | 82 | struct timespec ts; |
9f46080c MH |
83 | __u8 buffer[CN_PROC_MSG_SIZE]; |
84 | ||
85 | if (atomic_read(&proc_event_num_listeners) < 1) | |
86 | return; | |
87 | ||
88 | msg = (struct cn_msg*)buffer; | |
89 | ev = (struct proc_event*)msg->data; | |
90 | get_seq(&msg->seq, &ev->cpu); | |
822cfbff | 91 | ktime_get_ts(&ts); /* get high res monotonic timestamp */ |
af3e095a | 92 | put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns); |
9f46080c MH |
93 | ev->what = PROC_EVENT_EXEC; |
94 | ev->event_data.exec.process_pid = task->pid; | |
95 | ev->event_data.exec.process_tgid = task->tgid; | |
96 | ||
97 | memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id)); | |
98 | msg->ack = 0; /* not used */ | |
99 | msg->len = sizeof(*ev); | |
100 | cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL); | |
101 | } | |
102 | ||
103 | void proc_id_connector(struct task_struct *task, int which_id) | |
104 | { | |
105 | struct cn_msg *msg; | |
106 | struct proc_event *ev; | |
107 | __u8 buffer[CN_PROC_MSG_SIZE]; | |
822cfbff | 108 | struct timespec ts; |
c69e8d9c | 109 | const struct cred *cred; |
9f46080c MH |
110 | |
111 | if (atomic_read(&proc_event_num_listeners) < 1) | |
112 | return; | |
113 | ||
114 | msg = (struct cn_msg*)buffer; | |
115 | ev = (struct proc_event*)msg->data; | |
116 | ev->what = which_id; | |
117 | ev->event_data.id.process_pid = task->pid; | |
118 | ev->event_data.id.process_tgid = task->tgid; | |
c69e8d9c DH |
119 | rcu_read_lock(); |
120 | cred = __task_cred(task); | |
9f46080c | 121 | if (which_id == PROC_EVENT_UID) { |
c69e8d9c DH |
122 | ev->event_data.id.r.ruid = cred->uid; |
123 | ev->event_data.id.e.euid = cred->euid; | |
9f46080c | 124 | } else if (which_id == PROC_EVENT_GID) { |
c69e8d9c DH |
125 | ev->event_data.id.r.rgid = cred->gid; |
126 | ev->event_data.id.e.egid = cred->egid; | |
127 | } else { | |
128 | rcu_read_unlock(); | |
9f46080c | 129 | return; |
c69e8d9c DH |
130 | } |
131 | rcu_read_unlock(); | |
9f46080c | 132 | get_seq(&msg->seq, &ev->cpu); |
822cfbff | 133 | ktime_get_ts(&ts); /* get high res monotonic timestamp */ |
af3e095a | 134 | put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns); |
9f46080c MH |
135 | |
136 | memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id)); | |
137 | msg->ack = 0; /* not used */ | |
138 | msg->len = sizeof(*ev); | |
139 | cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL); | |
140 | } | |
141 | ||
02b51df1 SJR |
142 | void proc_sid_connector(struct task_struct *task) |
143 | { | |
144 | struct cn_msg *msg; | |
145 | struct proc_event *ev; | |
146 | struct timespec ts; | |
147 | __u8 buffer[CN_PROC_MSG_SIZE]; | |
148 | ||
149 | if (atomic_read(&proc_event_num_listeners) < 1) | |
150 | return; | |
151 | ||
152 | msg = (struct cn_msg *)buffer; | |
153 | ev = (struct proc_event *)msg->data; | |
154 | get_seq(&msg->seq, &ev->cpu); | |
155 | ktime_get_ts(&ts); /* get high res monotonic timestamp */ | |
156 | put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns); | |
157 | ev->what = PROC_EVENT_SID; | |
158 | ev->event_data.sid.process_pid = task->pid; | |
159 | ev->event_data.sid.process_tgid = task->tgid; | |
160 | ||
161 | memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id)); | |
162 | msg->ack = 0; /* not used */ | |
163 | msg->len = sizeof(*ev); | |
164 | cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL); | |
165 | } | |
166 | ||
9f46080c MH |
167 | void proc_exit_connector(struct task_struct *task) |
168 | { | |
169 | struct cn_msg *msg; | |
170 | struct proc_event *ev; | |
171 | __u8 buffer[CN_PROC_MSG_SIZE]; | |
822cfbff | 172 | struct timespec ts; |
9f46080c MH |
173 | |
174 | if (atomic_read(&proc_event_num_listeners) < 1) | |
175 | return; | |
176 | ||
177 | msg = (struct cn_msg*)buffer; | |
178 | ev = (struct proc_event*)msg->data; | |
179 | get_seq(&msg->seq, &ev->cpu); | |
822cfbff | 180 | ktime_get_ts(&ts); /* get high res monotonic timestamp */ |
af3e095a | 181 | put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns); |
9f46080c MH |
182 | ev->what = PROC_EVENT_EXIT; |
183 | ev->event_data.exit.process_pid = task->pid; | |
184 | ev->event_data.exit.process_tgid = task->tgid; | |
185 | ev->event_data.exit.exit_code = task->exit_code; | |
186 | ev->event_data.exit.exit_signal = task->exit_signal; | |
187 | ||
188 | memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id)); | |
189 | msg->ack = 0; /* not used */ | |
190 | msg->len = sizeof(*ev); | |
191 | cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL); | |
192 | } | |
193 | ||
194 | /* | |
195 | * Send an acknowledgement message to userspace | |
196 | * | |
197 | * Use 0 for success, EFOO otherwise. | |
198 | * Note: this is the negative of conventional kernel error | |
199 | * values because it's not being returned via syscall return | |
200 | * mechanisms. | |
201 | */ | |
202 | static void cn_proc_ack(int err, int rcvd_seq, int rcvd_ack) | |
203 | { | |
204 | struct cn_msg *msg; | |
205 | struct proc_event *ev; | |
206 | __u8 buffer[CN_PROC_MSG_SIZE]; | |
822cfbff | 207 | struct timespec ts; |
9f46080c MH |
208 | |
209 | if (atomic_read(&proc_event_num_listeners) < 1) | |
210 | return; | |
211 | ||
212 | msg = (struct cn_msg*)buffer; | |
213 | ev = (struct proc_event*)msg->data; | |
214 | msg->seq = rcvd_seq; | |
822cfbff | 215 | ktime_get_ts(&ts); /* get high res monotonic timestamp */ |
af3e095a | 216 | put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns); |
9f46080c MH |
217 | ev->cpu = -1; |
218 | ev->what = PROC_EVENT_NONE; | |
219 | ev->event_data.ack.err = err; | |
220 | memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id)); | |
221 | msg->ack = rcvd_ack + 1; | |
222 | msg->len = sizeof(*ev); | |
223 | cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL); | |
224 | } | |
225 | ||
226 | /** | |
227 | * cn_proc_mcast_ctl | |
228 | * @data: message sent from userspace via the connector | |
229 | */ | |
f0b25932 SB |
230 | static void cn_proc_mcast_ctl(struct cn_msg *msg, |
231 | struct netlink_skb_parms *nsp) | |
9f46080c | 232 | { |
9f46080c MH |
233 | enum proc_cn_mcast_op *mc_op = NULL; |
234 | int err = 0; | |
235 | ||
236 | if (msg->len != sizeof(*mc_op)) | |
237 | return; | |
238 | ||
239 | mc_op = (enum proc_cn_mcast_op*)msg->data; | |
240 | switch (*mc_op) { | |
241 | case PROC_CN_MCAST_LISTEN: | |
242 | atomic_inc(&proc_event_num_listeners); | |
243 | break; | |
244 | case PROC_CN_MCAST_IGNORE: | |
245 | atomic_dec(&proc_event_num_listeners); | |
246 | break; | |
247 | default: | |
248 | err = EINVAL; | |
249 | break; | |
250 | } | |
251 | cn_proc_ack(err, msg->seq, msg->ack); | |
252 | } | |
253 | ||
254 | /* | |
255 | * cn_proc_init - initialization entry point | |
256 | * | |
257 | * Adds the connector callback to the connector driver. | |
258 | */ | |
259 | static int __init cn_proc_init(void) | |
260 | { | |
261 | int err; | |
262 | ||
263 | if ((err = cn_add_callback(&cn_proc_event_id, "cn_proc", | |
264 | &cn_proc_mcast_ctl))) { | |
265 | printk(KERN_WARNING "cn_proc failed to register\n"); | |
266 | return err; | |
267 | } | |
268 | return 0; | |
269 | } | |
270 | ||
271 | module_init(cn_proc_init); |