[linux-2.6-block.git] / drivers / connector / cn_proc.c

/*
 * cn_proc.c - process events connector
 *
 * Copyright (C) Matt Helsley, IBM Corp. 2005
 * Based on cn_fork.c by Guillaume Thouvenin <guillaume.thouvenin@bull.net>
 * Original copyright notice follows:
 * Copyright (C) 2005 BULL SA.
 *
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/ktime.h>
#include <linux/init.h>
#include <linux/connector.h>
#include <linux/gfp.h>
#include <linux/ptrace.h>
#include <linux/atomic.h>
#include <linux/pid_namespace.h>

#include <linux/cn_proc.h>

/*
 * Size of a cn_msg followed by a proc_event structure.  Since the
 * sizeof struct cn_msg is a multiple of 4 bytes, but not 8 bytes, we
 * add one 4-byte word to the size here, and then start the actual
 * cn_msg structure 4 bytes into the stack buffer.  The result is that
 * the immediately following proc_event structure is aligned to 8 bytes.
 */
#define CN_PROC_MSG_SIZE (sizeof(struct cn_msg) + sizeof(struct proc_event) + 4)

/* See comment above; we test our assumption about sizeof struct cn_msg here. */
static inline struct cn_msg *buffer_to_cn_msg(__u8 *buffer)
{
	BUILD_BUG_ON(sizeof(struct cn_msg) != 20);
	return (struct cn_msg *)(buffer + 4);
}

static atomic_t proc_event_num_listeners = ATOMIC_INIT(0);
static struct cb_id cn_proc_event_id = { CN_IDX_PROC, CN_VAL_PROC };

/* proc_event_counts is used as the sequence number of the netlink message */
static DEFINE_PER_CPU(__u32, proc_event_counts) = { 0 };

static inline void send_msg(struct cn_msg *msg)
{
	preempt_disable();

	msg->seq = __this_cpu_inc_return(proc_event_counts) - 1;
	((struct proc_event *)msg->data)->cpu = smp_processor_id();

	/*
	 * Preemption remains disabled during send to ensure the messages are
	 * ordered according to their sequence numbers.
	 *
	 * If cn_netlink_send() fails, the data is not sent.
	 */
	cn_netlink_send(msg, 0, CN_IDX_PROC, GFP_NOWAIT);

	preempt_enable();
}

void proc_fork_connector(struct task_struct *task)
{
	struct cn_msg *msg;
	struct proc_event *ev;
	__u8 buffer[CN_PROC_MSG_SIZE] __aligned(8);
	struct task_struct *parent;

	if (atomic_read(&proc_event_num_listeners) < 1)
		return;

	msg = buffer_to_cn_msg(buffer);
	ev = (struct proc_event *)msg->data;
	memset(&ev->event_data, 0, sizeof(ev->event_data));
	ev->timestamp_ns = ktime_get_ns();
	ev->what = PROC_EVENT_FORK;
	rcu_read_lock();
	parent = rcu_dereference(task->real_parent);
	ev->event_data.fork.parent_pid = parent->pid;
	ev->event_data.fork.parent_tgid = parent->tgid;
	rcu_read_unlock();
	ev->event_data.fork.child_pid = task->pid;
	ev->event_data.fork.child_tgid = task->tgid;

	memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
	msg->ack = 0; /* not used */
	msg->len = sizeof(*ev);
	msg->flags = 0; /* not used */
	send_msg(msg);
}

void proc_exec_connector(struct task_struct *task)
{
	struct cn_msg *msg;
	struct proc_event *ev;
	__u8 buffer[CN_PROC_MSG_SIZE] __aligned(8);

	if (atomic_read(&proc_event_num_listeners) < 1)
		return;

	msg = buffer_to_cn_msg(buffer);
	ev = (struct proc_event *)msg->data;
	memset(&ev->event_data, 0, sizeof(ev->event_data));
	ev->timestamp_ns = ktime_get_ns();
	ev->what = PROC_EVENT_EXEC;
	ev->event_data.exec.process_pid = task->pid;
	ev->event_data.exec.process_tgid = task->tgid;

	memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
	msg->ack = 0; /* not used */
	msg->len = sizeof(*ev);
	msg->flags = 0; /* not used */
	send_msg(msg);
}

void proc_id_connector(struct task_struct *task, int which_id)
{
	struct cn_msg *msg;
	struct proc_event *ev;
	__u8 buffer[CN_PROC_MSG_SIZE] __aligned(8);
	const struct cred *cred;

	if (atomic_read(&proc_event_num_listeners) < 1)
		return;

	msg = buffer_to_cn_msg(buffer);
	ev = (struct proc_event *)msg->data;
	memset(&ev->event_data, 0, sizeof(ev->event_data));
	ev->what = which_id;
	ev->event_data.id.process_pid = task->pid;
	ev->event_data.id.process_tgid = task->tgid;
	rcu_read_lock();
	cred = __task_cred(task);
	if (which_id == PROC_EVENT_UID) {
		ev->event_data.id.r.ruid = from_kuid_munged(&init_user_ns, cred->uid);
		ev->event_data.id.e.euid = from_kuid_munged(&init_user_ns, cred->euid);
	} else if (which_id == PROC_EVENT_GID) {
		ev->event_data.id.r.rgid = from_kgid_munged(&init_user_ns, cred->gid);
		ev->event_data.id.e.egid = from_kgid_munged(&init_user_ns, cred->egid);
	} else {
		rcu_read_unlock();
		return;
	}
	rcu_read_unlock();
	ev->timestamp_ns = ktime_get_ns();

	memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
	msg->ack = 0; /* not used */
	msg->len = sizeof(*ev);
	msg->flags = 0; /* not used */
	send_msg(msg);
}

void proc_sid_connector(struct task_struct *task)
{
	struct cn_msg *msg;
	struct proc_event *ev;
	__u8 buffer[CN_PROC_MSG_SIZE] __aligned(8);

	if (atomic_read(&proc_event_num_listeners) < 1)
		return;

	msg = buffer_to_cn_msg(buffer);
	ev = (struct proc_event *)msg->data;
	memset(&ev->event_data, 0, sizeof(ev->event_data));
	ev->timestamp_ns = ktime_get_ns();
	ev->what = PROC_EVENT_SID;
	ev->event_data.sid.process_pid = task->pid;
	ev->event_data.sid.process_tgid = task->tgid;

	memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
	msg->ack = 0; /* not used */
	msg->len = sizeof(*ev);
	msg->flags = 0; /* not used */
	send_msg(msg);
}

void proc_ptrace_connector(struct task_struct *task, int ptrace_id)
{
	struct cn_msg *msg;
	struct proc_event *ev;
	__u8 buffer[CN_PROC_MSG_SIZE] __aligned(8);

	if (atomic_read(&proc_event_num_listeners) < 1)
		return;

	msg = buffer_to_cn_msg(buffer);
	ev = (struct proc_event *)msg->data;
	memset(&ev->event_data, 0, sizeof(ev->event_data));
	ev->timestamp_ns = ktime_get_ns();
	ev->what = PROC_EVENT_PTRACE;
	ev->event_data.ptrace.process_pid  = task->pid;
	ev->event_data.ptrace.process_tgid = task->tgid;
	if (ptrace_id == PTRACE_ATTACH) {
		ev->event_data.ptrace.tracer_pid  = current->pid;
		ev->event_data.ptrace.tracer_tgid = current->tgid;
	} else if (ptrace_id == PTRACE_DETACH) {
		ev->event_data.ptrace.tracer_pid  = 0;
		ev->event_data.ptrace.tracer_tgid = 0;
	} else
		return;

	memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
	msg->ack = 0; /* not used */
	msg->len = sizeof(*ev);
	msg->flags = 0; /* not used */
	send_msg(msg);
}

void proc_comm_connector(struct task_struct *task)
{
	struct cn_msg *msg;
	struct proc_event *ev;
	__u8 buffer[CN_PROC_MSG_SIZE] __aligned(8);

	if (atomic_read(&proc_event_num_listeners) < 1)
		return;

	msg = buffer_to_cn_msg(buffer);
	ev = (struct proc_event *)msg->data;
	memset(&ev->event_data, 0, sizeof(ev->event_data));
	ev->timestamp_ns = ktime_get_ns();
	ev->what = PROC_EVENT_COMM;
	ev->event_data.comm.process_pid  = task->pid;
	ev->event_data.comm.process_tgid = task->tgid;
	get_task_comm(ev->event_data.comm.comm, task);

	memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
	msg->ack = 0; /* not used */
	msg->len = sizeof(*ev);
	msg->flags = 0; /* not used */
	send_msg(msg);
}

void proc_coredump_connector(struct task_struct *task)
{
	struct cn_msg *msg;
	struct proc_event *ev;
	__u8 buffer[CN_PROC_MSG_SIZE] __aligned(8);

	if (atomic_read(&proc_event_num_listeners) < 1)
		return;

	msg = buffer_to_cn_msg(buffer);
	ev = (struct proc_event *)msg->data;
	memset(&ev->event_data, 0, sizeof(ev->event_data));
	ev->timestamp_ns = ktime_get_ns();
	ev->what = PROC_EVENT_COREDUMP;
	ev->event_data.coredump.process_pid = task->pid;
	ev->event_data.coredump.process_tgid = task->tgid;

	memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
	msg->ack = 0; /* not used */
	msg->len = sizeof(*ev);
	msg->flags = 0; /* not used */
	send_msg(msg);
}

void proc_exit_connector(struct task_struct *task)
{
	struct cn_msg *msg;
	struct proc_event *ev;
	__u8 buffer[CN_PROC_MSG_SIZE] __aligned(8);

	if (atomic_read(&proc_event_num_listeners) < 1)
		return;

	msg = buffer_to_cn_msg(buffer);
	ev = (struct proc_event *)msg->data;
	memset(&ev->event_data, 0, sizeof(ev->event_data));
	ev->timestamp_ns = ktime_get_ns();
	ev->what = PROC_EVENT_EXIT;
	ev->event_data.exit.process_pid = task->pid;
	ev->event_data.exit.process_tgid = task->tgid;
	ev->event_data.exit.exit_code = task->exit_code;
	ev->event_data.exit.exit_signal = task->exit_signal;

	memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
	msg->ack = 0; /* not used */
	msg->len = sizeof(*ev);
	msg->flags = 0; /* not used */
	send_msg(msg);
}

/*
 * Send an acknowledgement message to userspace
 *
 * Use 0 for success, EFOO otherwise.
 * Note: this is the negative of conventional kernel error
 * values because it's not being returned via syscall return
 * mechanisms.
 */
static void cn_proc_ack(int err, int rcvd_seq, int rcvd_ack)
{
	struct cn_msg *msg;
	struct proc_event *ev;
	__u8 buffer[CN_PROC_MSG_SIZE] __aligned(8);

	if (atomic_read(&proc_event_num_listeners) < 1)
		return;

	msg = buffer_to_cn_msg(buffer);
	ev = (struct proc_event *)msg->data;
	memset(&ev->event_data, 0, sizeof(ev->event_data));
	msg->seq = rcvd_seq;
	ev->timestamp_ns = ktime_get_ns();
	ev->cpu = -1;
	ev->what = PROC_EVENT_NONE;
	ev->event_data.ack.err = err;
	memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
	msg->ack = rcvd_ack + 1;
	msg->len = sizeof(*ev);
	msg->flags = 0; /* not used */
	send_msg(msg);
}

/**
 * cn_proc_mcast_ctl
 * @data: message sent from userspace via the connector
 */
static void cn_proc_mcast_ctl(struct cn_msg *msg,
			      struct netlink_skb_parms *nsp)
{
	enum proc_cn_mcast_op *mc_op = NULL;
	int err = 0;

	if (msg->len != sizeof(*mc_op))
		return;

	/* 
	 * Events are reported with respect to the initial pid
	 * and user namespaces so ignore requestors from
	 * other namespaces.
	 */
	if ((current_user_ns() != &init_user_ns) ||
	    (task_active_pid_ns(current) != &init_pid_ns))
		return;

	/* Can only change if privileged. */
	if (!__netlink_ns_capable(nsp, &init_user_ns, CAP_NET_ADMIN)) {
		err = EPERM;
		goto out;
	}

	mc_op = (enum proc_cn_mcast_op *)msg->data;
	switch (*mc_op) {
	case PROC_CN_MCAST_LISTEN:
		atomic_inc(&proc_event_num_listeners);
		break;
	case PROC_CN_MCAST_IGNORE:
		atomic_dec(&proc_event_num_listeners);
		break;
	default:
		err = EINVAL;
		break;
	}

out:
	cn_proc_ack(err, msg->seq, msg->ack);
}

/*
 * cn_proc_init - initialization entry point
 *
 * Adds the connector callback to the connector driver.
 */
static int __init cn_proc_init(void)
{
	int err = cn_add_callback(&cn_proc_event_id,
				  "cn_proc",
				  &cn_proc_mcast_ctl);
	if (err) {
		pr_warn("cn_proc failed to register\n");
		return err;
	}
	return 0;
}

module_init(cn_proc_init);
Commit	Line	Data
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>
60063497	32	#include <linux/atomic.h>
9582d901	33	#include <linux/pid_namespace.h>
60063497	34
9f46080c MH	35	#include <linux/cn_proc.h>
9f46080c MH	36
1ca1a4cf CM	37	/*
	38	* Size of a cn_msg followed by a proc_event structure. Since the
	39	* sizeof struct cn_msg is a multiple of 4 bytes, but not 8 bytes, we
	40	* add one 4-byte word to the size here, and then start the actual
	41	* cn_msg structure 4 bytes into the stack buffer. The result is that
	42	* the immediately following proc_event structure is aligned to 8 bytes.
	43	*/
	44	#define CN_PROC_MSG_SIZE (sizeof(struct cn_msg) + sizeof(struct proc_event) + 4)
	45
	46	/* See comment above; we test our assumption about sizeof struct cn_msg here. */
	47	static inline struct cn_msg buffer_to_cn_msg(__u8 buffer)
	48	{
	49	BUILD_BUG_ON(sizeof(struct cn_msg) != 20);
	50	return (struct cn_msg *)(buffer + 4);
	51	}
9f46080c MH	52
	53	static atomic_t proc_event_num_listeners = ATOMIC_INIT(0);
	54	static struct cb_id cn_proc_event_id = { CN_IDX_PROC, CN_VAL_PROC };
	55
cc398c2e	56	/* proc_event_counts is used as the sequence number of the netlink message */
9f46080c MH	57	static DEFINE_PER_CPU(__u32, proc_event_counts) = { 0 };
9f46080c MH	58
ab8ed951	59	static inline void send_msg(struct cn_msg *msg)
9f46080c	60	{
3ea9f683	61	preempt_disable();
ab8ed951 AC	62
	63	msg->seq = __this_cpu_inc_return(proc_event_counts) - 1;
	64	((struct proc_event *)msg->data)->cpu = smp_processor_id();
	65
	66	/*
	67	* Preemption remains disabled during send to ensure the messages are
	68	* ordered according to their sequence numbers.
	69	*
	70	* If cn_netlink_send() fails, the data is not sent.
	71	*/
	72	cn_netlink_send(msg, 0, CN_IDX_PROC, GFP_NOWAIT);
	73
3ea9f683	74	preempt_enable();
9f46080c MH	75	}
	76
	77	void proc_fork_connector(struct task_struct *task)
	78	{
	79	struct cn_msg *msg;
	80	struct proc_event *ev;
1ca1a4cf	81	__u8 buffer[CN_PROC_MSG_SIZE] __aligned(8);
9e8f90df	82	struct task_struct *parent;
9f46080c MH	83
	84	if (atomic_read(&proc_event_num_listeners) < 1)
	85	return;
	86
1ca1a4cf	87	msg = buffer_to_cn_msg(buffer);
f3c48ecc	88	ev = (struct proc_event *)msg->data;
e727ca82	89	memset(&ev->event_data, 0, sizeof(ev->event_data));
9e93f21b	90	ev->timestamp_ns = ktime_get_ns();
9f46080c	91	ev->what = PROC_EVENT_FORK;
9e8f90df ON	92	rcu_read_lock();
	93	parent = rcu_dereference(task->real_parent);
	94	ev->event_data.fork.parent_pid = parent->pid;
	95	ev->event_data.fork.parent_tgid = parent->tgid;
	96	rcu_read_unlock();
9f46080c MH	97	ev->event_data.fork.child_pid = task->pid;
	98	ev->event_data.fork.child_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);
e727ca82	103	msg->flags = 0; /* not used */
ab8ed951	104	send_msg(msg);
9f46080c MH	105	}
	106
	107	void proc_exec_connector(struct task_struct *task)
	108	{
	109	struct cn_msg *msg;
	110	struct proc_event *ev;
1ca1a4cf	111	__u8 buffer[CN_PROC_MSG_SIZE] __aligned(8);
9f46080c MH	112
	113	if (atomic_read(&proc_event_num_listeners) < 1)
	114	return;
	115
1ca1a4cf	116	msg = buffer_to_cn_msg(buffer);
f3c48ecc	117	ev = (struct proc_event *)msg->data;
e727ca82	118	memset(&ev->event_data, 0, sizeof(ev->event_data));
9e93f21b	119	ev->timestamp_ns = ktime_get_ns();
9f46080c MH	120	ev->what = PROC_EVENT_EXEC;
	121	ev->event_data.exec.process_pid = task->pid;
	122	ev->event_data.exec.process_tgid = task->tgid;
	123
	124	memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
	125	msg->ack = 0; /* not used */
	126	msg->len = sizeof(*ev);
e727ca82	127	msg->flags = 0; /* not used */
ab8ed951	128	send_msg(msg);
9f46080c MH	129	}
	130
	131	void proc_id_connector(struct task_struct *task, int which_id)
	132	{
	133	struct cn_msg *msg;
	134	struct proc_event *ev;
1ca1a4cf	135	__u8 buffer[CN_PROC_MSG_SIZE] __aligned(8);
c69e8d9c	136	const struct cred *cred;
9f46080c MH	137
	138	if (atomic_read(&proc_event_num_listeners) < 1)
	139	return;
	140
1ca1a4cf	141	msg = buffer_to_cn_msg(buffer);
f3c48ecc	142	ev = (struct proc_event *)msg->data;
e727ca82	143	memset(&ev->event_data, 0, sizeof(ev->event_data));
9f46080c MH	144	ev->what = which_id;
	145	ev->event_data.id.process_pid = task->pid;
	146	ev->event_data.id.process_tgid = task->tgid;
c69e8d9c DH	147	rcu_read_lock();
c69e8d9c DH	148	cred = __task_cred(task);
9f46080c	149	if (which_id == PROC_EVENT_UID) {
9582d901 EB	150	ev->event_data.id.r.ruid = from_kuid_munged(&init_user_ns, cred->uid);
9582d901 EB	151	ev->event_data.id.e.euid = from_kuid_munged(&init_user_ns, cred->euid);
9f46080c	152	} else if (which_id == PROC_EVENT_GID) {
9582d901 EB	153	ev->event_data.id.r.rgid = from_kgid_munged(&init_user_ns, cred->gid);
9582d901 EB	154	ev->event_data.id.e.egid = from_kgid_munged(&init_user_ns, cred->egid);
c69e8d9c DH	155	} else {
c69e8d9c DH	156	rcu_read_unlock();
f3c48ecc	157	return;
c69e8d9c DH	158	}
c69e8d9c DH	159	rcu_read_unlock();
9e93f21b	160	ev->timestamp_ns = ktime_get_ns();
9f46080c MH	161
	162	memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
	163	msg->ack = 0; /* not used */
	164	msg->len = sizeof(*ev);
e727ca82	165	msg->flags = 0; /* not used */
ab8ed951	166	send_msg(msg);
9f46080c MH	167	}
9f46080c MH	168
02b51df1 SJR	169	void proc_sid_connector(struct task_struct *task)
	170	{
	171	struct cn_msg *msg;
	172	struct proc_event *ev;
1ca1a4cf	173	__u8 buffer[CN_PROC_MSG_SIZE] __aligned(8);
02b51df1 SJR	174
	175	if (atomic_read(&proc_event_num_listeners) < 1)
	176	return;
	177
1ca1a4cf	178	msg = buffer_to_cn_msg(buffer);
02b51df1	179	ev = (struct proc_event *)msg->data;
e727ca82	180	memset(&ev->event_data, 0, sizeof(ev->event_data));
9e93f21b	181	ev->timestamp_ns = ktime_get_ns();
02b51df1 SJR	182	ev->what = PROC_EVENT_SID;
	183	ev->event_data.sid.process_pid = task->pid;
	184	ev->event_data.sid.process_tgid = task->tgid;
	185
	186	memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
	187	msg->ack = 0; /* not used */
	188	msg->len = sizeof(*ev);
e727ca82	189	msg->flags = 0; /* not used */
ab8ed951	190	send_msg(msg);
02b51df1 SJR	191	}
02b51df1 SJR	192
f701e5b7 VZ	193	void proc_ptrace_connector(struct task_struct *task, int ptrace_id)
	194	{
	195	struct cn_msg *msg;
	196	struct proc_event *ev;
1ca1a4cf	197	__u8 buffer[CN_PROC_MSG_SIZE] __aligned(8);
f701e5b7 VZ	198
	199	if (atomic_read(&proc_event_num_listeners) < 1)
	200	return;
	201
1ca1a4cf	202	msg = buffer_to_cn_msg(buffer);
f701e5b7	203	ev = (struct proc_event *)msg->data;
e727ca82	204	memset(&ev->event_data, 0, sizeof(ev->event_data));
9e93f21b	205	ev->timestamp_ns = ktime_get_ns();
f701e5b7 VZ	206	ev->what = PROC_EVENT_PTRACE;
	207	ev->event_data.ptrace.process_pid = task->pid;
	208	ev->event_data.ptrace.process_tgid = task->tgid;
	209	if (ptrace_id == PTRACE_ATTACH) {
	210	ev->event_data.ptrace.tracer_pid = current->pid;
	211	ev->event_data.ptrace.tracer_tgid = current->tgid;
	212	} else if (ptrace_id == PTRACE_DETACH) {
	213	ev->event_data.ptrace.tracer_pid = 0;
	214	ev->event_data.ptrace.tracer_tgid = 0;
	215	} else
	216	return;
	217
	218	memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
	219	msg->ack = 0; /* not used */
	220	msg->len = sizeof(*ev);
e727ca82	221	msg->flags = 0; /* not used */
ab8ed951	222	send_msg(msg);
f701e5b7 VZ	223	}
f701e5b7 VZ	224
f786ecba VZ	225	void proc_comm_connector(struct task_struct *task)
	226	{
	227	struct cn_msg *msg;
	228	struct proc_event *ev;
1ca1a4cf	229	__u8 buffer[CN_PROC_MSG_SIZE] __aligned(8);
f786ecba VZ	230
	231	if (atomic_read(&proc_event_num_listeners) < 1)
	232	return;
	233
1ca1a4cf	234	msg = buffer_to_cn_msg(buffer);
f786ecba	235	ev = (struct proc_event *)msg->data;
e727ca82	236	memset(&ev->event_data, 0, sizeof(ev->event_data));
9e93f21b	237	ev->timestamp_ns = ktime_get_ns();
f786ecba VZ	238	ev->what = PROC_EVENT_COMM;
	239	ev->event_data.comm.process_pid = task->pid;
	240	ev->event_data.comm.process_tgid = task->tgid;
	241	get_task_comm(ev->event_data.comm.comm, task);
	242
	243	memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
	244	msg->ack = 0; /* not used */
	245	msg->len = sizeof(*ev);
e727ca82	246	msg->flags = 0; /* not used */
ab8ed951	247	send_msg(msg);
2b5faa4c JD	248	}
	249
	250	void proc_coredump_connector(struct task_struct *task)
	251	{
	252	struct cn_msg *msg;
	253	struct proc_event *ev;
1ca1a4cf	254	__u8 buffer[CN_PROC_MSG_SIZE] __aligned(8);
2b5faa4c JD	255
	256	if (atomic_read(&proc_event_num_listeners) < 1)
	257	return;
	258
1ca1a4cf	259	msg = buffer_to_cn_msg(buffer);
2b5faa4c	260	ev = (struct proc_event *)msg->data;
e727ca82	261	memset(&ev->event_data, 0, sizeof(ev->event_data));
9e93f21b	262	ev->timestamp_ns = ktime_get_ns();
2b5faa4c JD	263	ev->what = PROC_EVENT_COREDUMP;
	264	ev->event_data.coredump.process_pid = task->pid;
	265	ev->event_data.coredump.process_tgid = task->tgid;
	266
	267	memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
	268	msg->ack = 0; /* not used */
	269	msg->len = sizeof(*ev);
e727ca82	270	msg->flags = 0; /* not used */
ab8ed951	271	send_msg(msg);
f786ecba VZ	272	}
f786ecba VZ	273
9f46080c MH	274	void proc_exit_connector(struct task_struct *task)
	275	{
	276	struct cn_msg *msg;
	277	struct proc_event *ev;
1ca1a4cf	278	__u8 buffer[CN_PROC_MSG_SIZE] __aligned(8);
9f46080c MH	279
	280	if (atomic_read(&proc_event_num_listeners) < 1)
	281	return;
	282
1ca1a4cf	283	msg = buffer_to_cn_msg(buffer);
f3c48ecc	284	ev = (struct proc_event *)msg->data;
e727ca82	285	memset(&ev->event_data, 0, sizeof(ev->event_data));
9e93f21b	286	ev->timestamp_ns = ktime_get_ns();
9f46080c MH	287	ev->what = PROC_EVENT_EXIT;
	288	ev->event_data.exit.process_pid = task->pid;
	289	ev->event_data.exit.process_tgid = task->tgid;
	290	ev->event_data.exit.exit_code = task->exit_code;
	291	ev->event_data.exit.exit_signal = task->exit_signal;
	292
	293	memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
	294	msg->ack = 0; /* not used */
	295	msg->len = sizeof(*ev);
e727ca82	296	msg->flags = 0; /* not used */
ab8ed951	297	send_msg(msg);
9f46080c MH	298	}
	299
	300	/*
	301	* Send an acknowledgement message to userspace
	302	*
	303	* Use 0 for success, EFOO otherwise.
	304	* Note: this is the negative of conventional kernel error
	305	* values because it's not being returned via syscall return
	306	* mechanisms.
	307	*/
	308	static void cn_proc_ack(int err, int rcvd_seq, int rcvd_ack)
	309	{
	310	struct cn_msg *msg;
	311	struct proc_event *ev;
1ca1a4cf	312	__u8 buffer[CN_PROC_MSG_SIZE] __aligned(8);
9f46080c MH	313
	314	if (atomic_read(&proc_event_num_listeners) < 1)
	315	return;
	316
1ca1a4cf	317	msg = buffer_to_cn_msg(buffer);
f3c48ecc	318	ev = (struct proc_event *)msg->data;
e727ca82	319	memset(&ev->event_data, 0, sizeof(ev->event_data));
9f46080c	320	msg->seq = rcvd_seq;
9e93f21b	321	ev->timestamp_ns = ktime_get_ns();
9f46080c MH	322	ev->cpu = -1;
	323	ev->what = PROC_EVENT_NONE;
	324	ev->event_data.ack.err = err;
	325	memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
	326	msg->ack = rcvd_ack + 1;
	327	msg->len = sizeof(*ev);
e727ca82	328	msg->flags = 0; /* not used */
ab8ed951	329	send_msg(msg);
9f46080c MH	330	}
	331
	332	/**
	333	* cn_proc_mcast_ctl
	334	* @data: message sent from userspace via the connector
	335	*/
f0b25932 SB	336	static void cn_proc_mcast_ctl(struct cn_msg *msg,
f0b25932 SB	337	struct netlink_skb_parms *nsp)
9f46080c	338	{
9f46080c MH	339	enum proc_cn_mcast_op *mc_op = NULL;
	340	int err = 0;
	341
	342	if (msg->len != sizeof(*mc_op))
	343	return;
	344
9582d901 EB	345	/*
	346	* Events are reported with respect to the initial pid
	347	* and user namespaces so ignore requestors from
	348	* other namespaces.
	349	*/
	350	if ((current_user_ns() != &init_user_ns) \|\|
	351	(task_active_pid_ns(current) != &init_pid_ns))
	352	return;
	353
e70ab977	354	/* Can only change if privileged. */
90f62cf3	355	if (!__netlink_ns_capable(nsp, &init_user_ns, CAP_NET_ADMIN)) {
e70ab977 KC	356	err = EPERM;
	357	goto out;
	358	}
	359
f3c48ecc	360	mc_op = (enum proc_cn_mcast_op *)msg->data;
9f46080c MH	361	switch (*mc_op) {
	362	case PROC_CN_MCAST_LISTEN:
	363	atomic_inc(&proc_event_num_listeners);
	364	break;
	365	case PROC_CN_MCAST_IGNORE:
	366	atomic_dec(&proc_event_num_listeners);
	367	break;
	368	default:
	369	err = EINVAL;
	370	break;
	371	}
e70ab977 KC	372
e70ab977 KC	373	out:
9f46080c MH	374	cn_proc_ack(err, msg->seq, msg->ack);
	375	}
	376
	377	/*
	378	* cn_proc_init - initialization entry point
	379	*
	380	* Adds the connector callback to the connector driver.
	381	*/
	382	static int __init cn_proc_init(void)
	383	{
f3c48ecc VI	384	int err = cn_add_callback(&cn_proc_event_id,
	385	"cn_proc",
	386	&cn_proc_mcast_ctl);
	387	if (err) {
	388	pr_warn("cn_proc failed to register\n");
9f46080c MH	389	return err;
	390	}
	391	return 0;
	392	}
	393
	394	module_init(cn_proc_init);