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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> |
5a0e3ad6 | 30 | #include <linux/gfp.h> |
f701e5b7 | 31 | #include <linux/ptrace.h> |
9f46080c | 32 | #include <asm/atomic.h> |
af3e095a | 33 | #include <asm/unaligned.h> |
9f46080c MH |
34 | |
35 | #include <linux/cn_proc.h> | |
36 | ||
37 | #define CN_PROC_MSG_SIZE (sizeof(struct cn_msg) + sizeof(struct proc_event)) | |
38 | ||
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 }; | |
41 | ||
cc398c2e | 42 | /* proc_event_counts is used as the sequence number of the netlink message */ |
9f46080c MH |
43 | static DEFINE_PER_CPU(__u32, proc_event_counts) = { 0 }; |
44 | ||
45 | static inline void get_seq(__u32 *ts, int *cpu) | |
46 | { | |
3ea9f683 CL |
47 | preempt_disable(); |
48 | *ts = __this_cpu_inc_return(proc_event_counts) -1; | |
9f46080c | 49 | *cpu = smp_processor_id(); |
3ea9f683 | 50 | preempt_enable(); |
9f46080c MH |
51 | } |
52 | ||
53 | void proc_fork_connector(struct task_struct *task) | |
54 | { | |
55 | struct cn_msg *msg; | |
56 | struct proc_event *ev; | |
57 | __u8 buffer[CN_PROC_MSG_SIZE]; | |
822cfbff | 58 | struct timespec ts; |
9f46080c MH |
59 | |
60 | if (atomic_read(&proc_event_num_listeners) < 1) | |
61 | return; | |
62 | ||
63 | msg = (struct cn_msg*)buffer; | |
64 | ev = (struct proc_event*)msg->data; | |
65 | get_seq(&msg->seq, &ev->cpu); | |
822cfbff | 66 | ktime_get_ts(&ts); /* get high res monotonic timestamp */ |
af3e095a | 67 | put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns); |
9f46080c MH |
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; | |
73 | ||
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); | |
79 | } | |
80 | ||
81 | void proc_exec_connector(struct task_struct *task) | |
82 | { | |
83 | struct cn_msg *msg; | |
84 | struct proc_event *ev; | |
822cfbff | 85 | struct timespec ts; |
9f46080c MH |
86 | __u8 buffer[CN_PROC_MSG_SIZE]; |
87 | ||
88 | if (atomic_read(&proc_event_num_listeners) < 1) | |
89 | return; | |
90 | ||
91 | msg = (struct cn_msg*)buffer; | |
92 | ev = (struct proc_event*)msg->data; | |
93 | get_seq(&msg->seq, &ev->cpu); | |
822cfbff | 94 | ktime_get_ts(&ts); /* get high res monotonic timestamp */ |
af3e095a | 95 | put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns); |
9f46080c MH |
96 | ev->what = PROC_EVENT_EXEC; |
97 | ev->event_data.exec.process_pid = task->pid; | |
98 | ev->event_data.exec.process_tgid = task->tgid; | |
99 | ||
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); | |
104 | } | |
105 | ||
106 | void proc_id_connector(struct task_struct *task, int which_id) | |
107 | { | |
108 | struct cn_msg *msg; | |
109 | struct proc_event *ev; | |
110 | __u8 buffer[CN_PROC_MSG_SIZE]; | |
822cfbff | 111 | struct timespec ts; |
c69e8d9c | 112 | const struct cred *cred; |
9f46080c MH |
113 | |
114 | if (atomic_read(&proc_event_num_listeners) < 1) | |
115 | return; | |
116 | ||
117 | msg = (struct cn_msg*)buffer; | |
118 | ev = (struct proc_event*)msg->data; | |
119 | ev->what = which_id; | |
120 | ev->event_data.id.process_pid = task->pid; | |
121 | ev->event_data.id.process_tgid = task->tgid; | |
c69e8d9c DH |
122 | rcu_read_lock(); |
123 | cred = __task_cred(task); | |
9f46080c | 124 | if (which_id == PROC_EVENT_UID) { |
c69e8d9c DH |
125 | ev->event_data.id.r.ruid = cred->uid; |
126 | ev->event_data.id.e.euid = cred->euid; | |
9f46080c | 127 | } else if (which_id == PROC_EVENT_GID) { |
c69e8d9c DH |
128 | ev->event_data.id.r.rgid = cred->gid; |
129 | ev->event_data.id.e.egid = cred->egid; | |
130 | } else { | |
131 | rcu_read_unlock(); | |
9f46080c | 132 | return; |
c69e8d9c DH |
133 | } |
134 | rcu_read_unlock(); | |
9f46080c | 135 | get_seq(&msg->seq, &ev->cpu); |
822cfbff | 136 | ktime_get_ts(&ts); /* get high res monotonic timestamp */ |
af3e095a | 137 | put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns); |
9f46080c MH |
138 | |
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); | |
143 | } | |
144 | ||
02b51df1 SJR |
145 | void proc_sid_connector(struct task_struct *task) |
146 | { | |
147 | struct cn_msg *msg; | |
148 | struct proc_event *ev; | |
149 | struct timespec ts; | |
150 | __u8 buffer[CN_PROC_MSG_SIZE]; | |
151 | ||
152 | if (atomic_read(&proc_event_num_listeners) < 1) | |
153 | return; | |
154 | ||
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; | |
163 | ||
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); | |
168 | } | |
169 | ||
f701e5b7 VZ |
170 | void proc_ptrace_connector(struct task_struct *task, int ptrace_id) |
171 | { | |
172 | struct cn_msg *msg; | |
173 | struct proc_event *ev; | |
174 | struct timespec ts; | |
175 | __u8 buffer[CN_PROC_MSG_SIZE]; | |
f701e5b7 VZ |
176 | |
177 | if (atomic_read(&proc_event_num_listeners) < 1) | |
178 | return; | |
179 | ||
180 | msg = (struct cn_msg *)buffer; | |
181 | ev = (struct proc_event *)msg->data; | |
182 | get_seq(&msg->seq, &ev->cpu); | |
183 | ktime_get_ts(&ts); /* get high res monotonic timestamp */ | |
184 | put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns); | |
185 | ev->what = PROC_EVENT_PTRACE; | |
186 | ev->event_data.ptrace.process_pid = task->pid; | |
187 | ev->event_data.ptrace.process_tgid = task->tgid; | |
188 | if (ptrace_id == PTRACE_ATTACH) { | |
189 | ev->event_data.ptrace.tracer_pid = current->pid; | |
190 | ev->event_data.ptrace.tracer_tgid = current->tgid; | |
191 | } else if (ptrace_id == PTRACE_DETACH) { | |
192 | ev->event_data.ptrace.tracer_pid = 0; | |
193 | ev->event_data.ptrace.tracer_tgid = 0; | |
194 | } else | |
195 | return; | |
196 | ||
197 | memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id)); | |
198 | msg->ack = 0; /* not used */ | |
199 | msg->len = sizeof(*ev); | |
200 | cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL); | |
201 | } | |
202 | ||
9f46080c MH |
203 | void proc_exit_connector(struct task_struct *task) |
204 | { | |
205 | struct cn_msg *msg; | |
206 | struct proc_event *ev; | |
207 | __u8 buffer[CN_PROC_MSG_SIZE]; | |
822cfbff | 208 | struct timespec ts; |
9f46080c MH |
209 | |
210 | if (atomic_read(&proc_event_num_listeners) < 1) | |
211 | return; | |
212 | ||
213 | msg = (struct cn_msg*)buffer; | |
214 | ev = (struct proc_event*)msg->data; | |
215 | get_seq(&msg->seq, &ev->cpu); | |
822cfbff | 216 | ktime_get_ts(&ts); /* get high res monotonic timestamp */ |
af3e095a | 217 | put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns); |
9f46080c MH |
218 | ev->what = PROC_EVENT_EXIT; |
219 | ev->event_data.exit.process_pid = task->pid; | |
220 | ev->event_data.exit.process_tgid = task->tgid; | |
221 | ev->event_data.exit.exit_code = task->exit_code; | |
222 | ev->event_data.exit.exit_signal = task->exit_signal; | |
223 | ||
224 | memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id)); | |
225 | msg->ack = 0; /* not used */ | |
226 | msg->len = sizeof(*ev); | |
227 | cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL); | |
228 | } | |
229 | ||
230 | /* | |
231 | * Send an acknowledgement message to userspace | |
232 | * | |
233 | * Use 0 for success, EFOO otherwise. | |
234 | * Note: this is the negative of conventional kernel error | |
235 | * values because it's not being returned via syscall return | |
236 | * mechanisms. | |
237 | */ | |
238 | static void cn_proc_ack(int err, int rcvd_seq, int rcvd_ack) | |
239 | { | |
240 | struct cn_msg *msg; | |
241 | struct proc_event *ev; | |
242 | __u8 buffer[CN_PROC_MSG_SIZE]; | |
822cfbff | 243 | struct timespec ts; |
9f46080c MH |
244 | |
245 | if (atomic_read(&proc_event_num_listeners) < 1) | |
246 | return; | |
247 | ||
248 | msg = (struct cn_msg*)buffer; | |
249 | ev = (struct proc_event*)msg->data; | |
250 | msg->seq = rcvd_seq; | |
822cfbff | 251 | ktime_get_ts(&ts); /* get high res monotonic timestamp */ |
af3e095a | 252 | put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns); |
9f46080c MH |
253 | ev->cpu = -1; |
254 | ev->what = PROC_EVENT_NONE; | |
255 | ev->event_data.ack.err = err; | |
256 | memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id)); | |
257 | msg->ack = rcvd_ack + 1; | |
258 | msg->len = sizeof(*ev); | |
259 | cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL); | |
260 | } | |
261 | ||
262 | /** | |
263 | * cn_proc_mcast_ctl | |
264 | * @data: message sent from userspace via the connector | |
265 | */ | |
f0b25932 SB |
266 | static void cn_proc_mcast_ctl(struct cn_msg *msg, |
267 | struct netlink_skb_parms *nsp) | |
9f46080c | 268 | { |
9f46080c MH |
269 | enum proc_cn_mcast_op *mc_op = NULL; |
270 | int err = 0; | |
271 | ||
272 | if (msg->len != sizeof(*mc_op)) | |
273 | return; | |
274 | ||
275 | mc_op = (enum proc_cn_mcast_op*)msg->data; | |
276 | switch (*mc_op) { | |
277 | case PROC_CN_MCAST_LISTEN: | |
278 | atomic_inc(&proc_event_num_listeners); | |
279 | break; | |
280 | case PROC_CN_MCAST_IGNORE: | |
281 | atomic_dec(&proc_event_num_listeners); | |
282 | break; | |
283 | default: | |
284 | err = EINVAL; | |
285 | break; | |
286 | } | |
287 | cn_proc_ack(err, msg->seq, msg->ack); | |
288 | } | |
289 | ||
290 | /* | |
291 | * cn_proc_init - initialization entry point | |
292 | * | |
293 | * Adds the connector callback to the connector driver. | |
294 | */ | |
295 | static int __init cn_proc_init(void) | |
296 | { | |
297 | int err; | |
298 | ||
299 | if ((err = cn_add_callback(&cn_proc_event_id, "cn_proc", | |
300 | &cn_proc_mcast_ctl))) { | |
301 | printk(KERN_WARNING "cn_proc failed to register\n"); | |
302 | return err; | |
303 | } | |
304 | return 0; | |
305 | } | |
306 | ||
307 | module_init(cn_proc_init); |