[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 <asm/unaligned.h>

#include <linux/cn_proc.h>

#define CN_PROC_MSG_SIZE (sizeof(struct cn_msg) + sizeof(struct proc_event))

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 get_seq(__u32 *ts, int *cpu)
{
	preempt_disable();
	*ts = __this_cpu_inc_return(proc_event_counts) - 1;
	*cpu = smp_processor_id();
	preempt_enable();
}

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

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

	msg = (struct cn_msg *)buffer;
	ev = (struct proc_event *)msg->data;
	memset(&ev->event_data, 0, sizeof(ev->event_data));
	get_seq(&msg->seq, &ev->cpu);
	ktime_get_ts(&ts); /* get high res monotonic timestamp */
	put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_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 */
	/*  If cn_netlink_send() failed, the data is not sent */
	cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
}

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

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

	msg = (struct cn_msg *)buffer;
	ev = (struct proc_event *)msg->data;
	memset(&ev->event_data, 0, sizeof(ev->event_data));
	get_seq(&msg->seq, &ev->cpu);
	ktime_get_ts(&ts); /* get high res monotonic timestamp */
	put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_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 */
	cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
}

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];
	struct timespec ts;
	const struct cred *cred;

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

	msg = (struct 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();
	get_seq(&msg->seq, &ev->cpu);
	ktime_get_ts(&ts); /* get high res monotonic timestamp */
	put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_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 */
	cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
}

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

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

	msg = (struct cn_msg *)buffer;
	ev = (struct proc_event *)msg->data;
	memset(&ev->event_data, 0, sizeof(ev->event_data));
	get_seq(&msg->seq, &ev->cpu);
	ktime_get_ts(&ts); /* get high res monotonic timestamp */
	put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_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 */
	cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
}

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

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

	msg = (struct cn_msg *)buffer;
	ev = (struct proc_event *)msg->data;
	memset(&ev->event_data, 0, sizeof(ev->event_data));
	get_seq(&msg->seq, &ev->cpu);
	ktime_get_ts(&ts); /* get high res monotonic timestamp */
	put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_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 */
	cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
}

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

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

	msg = (struct cn_msg *)buffer;
	ev = (struct proc_event *)msg->data;
	memset(&ev->event_data, 0, sizeof(ev->event_data));
	get_seq(&msg->seq, &ev->cpu);
	ktime_get_ts(&ts); /* get high res monotonic timestamp */
	put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_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 */
	cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
}

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

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

	msg = (struct cn_msg *)buffer;
	ev = (struct proc_event *)msg->data;
	memset(&ev->event_data, 0, sizeof(ev->event_data));
	get_seq(&msg->seq, &ev->cpu);
	ktime_get_ts(&ts); /* get high res monotonic timestamp */
	put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_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 */
	cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
}

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

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

	msg = (struct cn_msg *)buffer;
	ev = (struct proc_event *)msg->data;
	memset(&ev->event_data, 0, sizeof(ev->event_data));
	get_seq(&msg->seq, &ev->cpu);
	ktime_get_ts(&ts); /* get high res monotonic timestamp */
	put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_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 */
	cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
}

/*
 * 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];
	struct timespec ts;

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

	msg = (struct cn_msg *)buffer;
	ev = (struct proc_event *)msg->data;
	memset(&ev->event_data, 0, sizeof(ev->event_data));
	msg->seq = rcvd_seq;
	ktime_get_ts(&ts); /* get high res monotonic timestamp */
	put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_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 */
	cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
}

/**
 * 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 (!capable(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
af3e095a	35	#include <asm/unaligned.h>
9f46080c MH	36
	37	#include <linux/cn_proc.h>
	38
	39	#define CN_PROC_MSG_SIZE (sizeof(struct cn_msg) + sizeof(struct proc_event))
	40
	41	static atomic_t proc_event_num_listeners = ATOMIC_INIT(0);
	42	static struct cb_id cn_proc_event_id = { CN_IDX_PROC, CN_VAL_PROC };
	43
cc398c2e	44	/* proc_event_counts is used as the sequence number of the netlink message */
9f46080c MH	45	static DEFINE_PER_CPU(__u32, proc_event_counts) = { 0 };
	46
	47	static inline void get_seq(__u32 ts, int cpu)
	48	{
3ea9f683	49	preempt_disable();
f3c48ecc	50	*ts = __this_cpu_inc_return(proc_event_counts) - 1;
9f46080c	51	*cpu = smp_processor_id();
3ea9f683	52	preempt_enable();
9f46080c MH	53	}
	54
	55	void 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];
822cfbff	60	struct timespec ts;
9e8f90df	61	struct task_struct *parent;
9f46080c MH	62
	63	if (atomic_read(&proc_event_num_listeners) < 1)
	64	return;
	65
f3c48ecc VI	66	msg = (struct cn_msg *)buffer;
f3c48ecc VI	67	ev = (struct proc_event *)msg->data;
e727ca82	68	memset(&ev->event_data, 0, sizeof(ev->event_data));
9f46080c	69	get_seq(&msg->seq, &ev->cpu);
822cfbff	70	ktime_get_ts(&ts); /* get high res monotonic timestamp */
af3e095a	71	put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns);
9f46080c	72	ev->what = PROC_EVENT_FORK;
9e8f90df ON	73	rcu_read_lock();
	74	parent = rcu_dereference(task->real_parent);
	75	ev->event_data.fork.parent_pid = parent->pid;
	76	ev->event_data.fork.parent_tgid = parent->tgid;
	77	rcu_read_unlock();
9f46080c MH	78	ev->event_data.fork.child_pid = task->pid;
	79	ev->event_data.fork.child_tgid = task->tgid;
	80
	81	memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
	82	msg->ack = 0; /* not used */
	83	msg->len = sizeof(*ev);
e727ca82	84	msg->flags = 0; /* not used */
9f46080c MH	85	/* If cn_netlink_send() failed, the data is not sent */
	86	cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
	87	}
	88
	89	void proc_exec_connector(struct task_struct *task)
	90	{
	91	struct cn_msg *msg;
	92	struct proc_event *ev;
822cfbff	93	struct timespec ts;
9f46080c MH	94	__u8 buffer[CN_PROC_MSG_SIZE];
	95
	96	if (atomic_read(&proc_event_num_listeners) < 1)
	97	return;
	98
f3c48ecc VI	99	msg = (struct cn_msg *)buffer;
f3c48ecc VI	100	ev = (struct proc_event *)msg->data;
e727ca82	101	memset(&ev->event_data, 0, sizeof(ev->event_data));
9f46080c	102	get_seq(&msg->seq, &ev->cpu);
822cfbff	103	ktime_get_ts(&ts); /* get high res monotonic timestamp */
af3e095a	104	put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns);
9f46080c MH	105	ev->what = PROC_EVENT_EXEC;
	106	ev->event_data.exec.process_pid = task->pid;
	107	ev->event_data.exec.process_tgid = task->tgid;
	108
	109	memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
	110	msg->ack = 0; /* not used */
	111	msg->len = sizeof(*ev);
e727ca82	112	msg->flags = 0; /* not used */
9f46080c MH	113	cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
	114	}
	115
	116	void proc_id_connector(struct task_struct *task, int which_id)
	117	{
	118	struct cn_msg *msg;
	119	struct proc_event *ev;
	120	__u8 buffer[CN_PROC_MSG_SIZE];
822cfbff	121	struct timespec ts;
c69e8d9c	122	const struct cred *cred;
9f46080c MH	123
	124	if (atomic_read(&proc_event_num_listeners) < 1)
	125	return;
	126
f3c48ecc VI	127	msg = (struct cn_msg *)buffer;
f3c48ecc VI	128	ev = (struct proc_event *)msg->data;
e727ca82	129	memset(&ev->event_data, 0, sizeof(ev->event_data));
9f46080c MH	130	ev->what = which_id;
	131	ev->event_data.id.process_pid = task->pid;
	132	ev->event_data.id.process_tgid = task->tgid;
c69e8d9c DH	133	rcu_read_lock();
c69e8d9c DH	134	cred = __task_cred(task);
9f46080c	135	if (which_id == PROC_EVENT_UID) {
9582d901 EB	136	ev->event_data.id.r.ruid = from_kuid_munged(&init_user_ns, cred->uid);
9582d901 EB	137	ev->event_data.id.e.euid = from_kuid_munged(&init_user_ns, cred->euid);
9f46080c	138	} else if (which_id == PROC_EVENT_GID) {
9582d901 EB	139	ev->event_data.id.r.rgid = from_kgid_munged(&init_user_ns, cred->gid);
9582d901 EB	140	ev->event_data.id.e.egid = from_kgid_munged(&init_user_ns, cred->egid);
c69e8d9c DH	141	} else {
c69e8d9c DH	142	rcu_read_unlock();
f3c48ecc	143	return;
c69e8d9c DH	144	}
c69e8d9c DH	145	rcu_read_unlock();
9f46080c	146	get_seq(&msg->seq, &ev->cpu);
822cfbff	147	ktime_get_ts(&ts); /* get high res monotonic timestamp */
af3e095a	148	put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns);
9f46080c MH	149
	150	memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
	151	msg->ack = 0; /* not used */
	152	msg->len = sizeof(*ev);
e727ca82	153	msg->flags = 0; /* not used */
9f46080c MH	154	cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
	155	}
	156
02b51df1 SJR	157	void proc_sid_connector(struct task_struct *task)
	158	{
	159	struct cn_msg *msg;
	160	struct proc_event *ev;
	161	struct timespec ts;
	162	__u8 buffer[CN_PROC_MSG_SIZE];
	163
	164	if (atomic_read(&proc_event_num_listeners) < 1)
	165	return;
	166
	167	msg = (struct cn_msg *)buffer;
	168	ev = (struct proc_event *)msg->data;
e727ca82	169	memset(&ev->event_data, 0, sizeof(ev->event_data));
02b51df1 SJR	170	get_seq(&msg->seq, &ev->cpu);
	171	ktime_get_ts(&ts); /* get high res monotonic timestamp */
	172	put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns);
	173	ev->what = PROC_EVENT_SID;
	174	ev->event_data.sid.process_pid = task->pid;
	175	ev->event_data.sid.process_tgid = task->tgid;
	176
	177	memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
	178	msg->ack = 0; /* not used */
	179	msg->len = sizeof(*ev);
e727ca82	180	msg->flags = 0; /* not used */
02b51df1 SJR	181	cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
	182	}
	183
f701e5b7 VZ	184	void proc_ptrace_connector(struct task_struct *task, int ptrace_id)
	185	{
	186	struct cn_msg *msg;
	187	struct proc_event *ev;
	188	struct timespec ts;
	189	__u8 buffer[CN_PROC_MSG_SIZE];
f701e5b7 VZ	190
	191	if (atomic_read(&proc_event_num_listeners) < 1)
	192	return;
	193
	194	msg = (struct cn_msg *)buffer;
	195	ev = (struct proc_event *)msg->data;
e727ca82	196	memset(&ev->event_data, 0, sizeof(ev->event_data));
f701e5b7 VZ	197	get_seq(&msg->seq, &ev->cpu);
	198	ktime_get_ts(&ts); /* get high res monotonic timestamp */
	199	put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns);
	200	ev->what = PROC_EVENT_PTRACE;
	201	ev->event_data.ptrace.process_pid = task->pid;
	202	ev->event_data.ptrace.process_tgid = task->tgid;
	203	if (ptrace_id == PTRACE_ATTACH) {
	204	ev->event_data.ptrace.tracer_pid = current->pid;
	205	ev->event_data.ptrace.tracer_tgid = current->tgid;
	206	} else if (ptrace_id == PTRACE_DETACH) {
	207	ev->event_data.ptrace.tracer_pid = 0;
	208	ev->event_data.ptrace.tracer_tgid = 0;
	209	} else
	210	return;
	211
	212	memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
	213	msg->ack = 0; /* not used */
	214	msg->len = sizeof(*ev);
e727ca82	215	msg->flags = 0; /* not used */
f701e5b7 VZ	216	cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
	217	}
	218
f786ecba VZ	219	void proc_comm_connector(struct task_struct *task)
	220	{
	221	struct cn_msg *msg;
	222	struct proc_event *ev;
	223	struct timespec ts;
	224	__u8 buffer[CN_PROC_MSG_SIZE];
	225
	226	if (atomic_read(&proc_event_num_listeners) < 1)
	227	return;
	228
	229	msg = (struct cn_msg *)buffer;
	230	ev = (struct proc_event *)msg->data;
e727ca82	231	memset(&ev->event_data, 0, sizeof(ev->event_data));
f786ecba VZ	232	get_seq(&msg->seq, &ev->cpu);
	233	ktime_get_ts(&ts); /* get high res monotonic timestamp */
	234	put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns);
	235	ev->what = PROC_EVENT_COMM;
	236	ev->event_data.comm.process_pid = task->pid;
	237	ev->event_data.comm.process_tgid = task->tgid;
	238	get_task_comm(ev->event_data.comm.comm, task);
	239
	240	memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
	241	msg->ack = 0; /* not used */
	242	msg->len = sizeof(*ev);
e727ca82	243	msg->flags = 0; /* not used */
2b5faa4c JD	244	cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
	245	}
	246
	247	void proc_coredump_connector(struct task_struct *task)
	248	{
	249	struct cn_msg *msg;
	250	struct proc_event *ev;
	251	__u8 buffer[CN_PROC_MSG_SIZE];
	252	struct timespec ts;
	253
	254	if (atomic_read(&proc_event_num_listeners) < 1)
	255	return;
	256
	257	msg = (struct cn_msg *)buffer;
	258	ev = (struct proc_event *)msg->data;
e727ca82	259	memset(&ev->event_data, 0, sizeof(ev->event_data));
2b5faa4c JD	260	get_seq(&msg->seq, &ev->cpu);
	261	ktime_get_ts(&ts); /* get high res monotonic timestamp */
	262	put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns);
	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 */
f786ecba VZ	271	cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
	272	}
	273
9f46080c MH	274	void proc_exit_connector(struct task_struct *task)
	275	{
	276	struct cn_msg *msg;
	277	struct proc_event *ev;
	278	__u8 buffer[CN_PROC_MSG_SIZE];
822cfbff	279	struct timespec ts;
9f46080c MH	280
	281	if (atomic_read(&proc_event_num_listeners) < 1)
	282	return;
	283
f3c48ecc VI	284	msg = (struct cn_msg *)buffer;
f3c48ecc VI	285	ev = (struct proc_event *)msg->data;
e727ca82	286	memset(&ev->event_data, 0, sizeof(ev->event_data));
9f46080c	287	get_seq(&msg->seq, &ev->cpu);
822cfbff	288	ktime_get_ts(&ts); /* get high res monotonic timestamp */
af3e095a	289	put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns);
9f46080c MH	290	ev->what = PROC_EVENT_EXIT;
	291	ev->event_data.exit.process_pid = task->pid;
	292	ev->event_data.exit.process_tgid = task->tgid;
	293	ev->event_data.exit.exit_code = task->exit_code;
	294	ev->event_data.exit.exit_signal = task->exit_signal;
	295
	296	memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
	297	msg->ack = 0; /* not used */
	298	msg->len = sizeof(*ev);
e727ca82	299	msg->flags = 0; /* not used */
9f46080c MH	300	cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
	301	}
	302
	303	/*
	304	* Send an acknowledgement message to userspace
	305	*
	306	* Use 0 for success, EFOO otherwise.
	307	* Note: this is the negative of conventional kernel error
	308	* values because it's not being returned via syscall return
	309	* mechanisms.
	310	*/
	311	static void cn_proc_ack(int err, int rcvd_seq, int rcvd_ack)
	312	{
	313	struct cn_msg *msg;
	314	struct proc_event *ev;
	315	__u8 buffer[CN_PROC_MSG_SIZE];
822cfbff	316	struct timespec ts;
9f46080c MH	317
	318	if (atomic_read(&proc_event_num_listeners) < 1)
	319	return;
	320
f3c48ecc VI	321	msg = (struct cn_msg *)buffer;
f3c48ecc VI	322	ev = (struct proc_event *)msg->data;
e727ca82	323	memset(&ev->event_data, 0, sizeof(ev->event_data));
9f46080c	324	msg->seq = rcvd_seq;
822cfbff	325	ktime_get_ts(&ts); /* get high res monotonic timestamp */
af3e095a	326	put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns);
9f46080c MH	327	ev->cpu = -1;
	328	ev->what = PROC_EVENT_NONE;
	329	ev->event_data.ack.err = err;
	330	memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
	331	msg->ack = rcvd_ack + 1;
	332	msg->len = sizeof(*ev);
e727ca82	333	msg->flags = 0; /* not used */
9f46080c MH	334	cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
	335	}
	336
	337	/**
	338	* cn_proc_mcast_ctl
	339	* @data: message sent from userspace via the connector
	340	*/
f0b25932 SB	341	static void cn_proc_mcast_ctl(struct cn_msg *msg,
f0b25932 SB	342	struct netlink_skb_parms *nsp)
9f46080c	343	{
9f46080c MH	344	enum proc_cn_mcast_op *mc_op = NULL;
	345	int err = 0;
	346
	347	if (msg->len != sizeof(*mc_op))
	348	return;
	349
9582d901 EB	350	/*
	351	* Events are reported with respect to the initial pid
	352	* and user namespaces so ignore requestors from
	353	* other namespaces.
	354	*/
	355	if ((current_user_ns() != &init_user_ns) \|\|
	356	(task_active_pid_ns(current) != &init_pid_ns))
	357	return;
	358
e70ab977 KC	359	/* Can only change if privileged. */
	360	if (!capable(CAP_NET_ADMIN)) {
	361	err = EPERM;
	362	goto out;
	363	}
	364
f3c48ecc	365	mc_op = (enum proc_cn_mcast_op *)msg->data;
9f46080c MH	366	switch (*mc_op) {
	367	case PROC_CN_MCAST_LISTEN:
	368	atomic_inc(&proc_event_num_listeners);
	369	break;
	370	case PROC_CN_MCAST_IGNORE:
	371	atomic_dec(&proc_event_num_listeners);
	372	break;
	373	default:
	374	err = EINVAL;
	375	break;
	376	}
e70ab977 KC	377
e70ab977 KC	378	out:
9f46080c MH	379	cn_proc_ack(err, msg->seq, msg->ack);
	380	}
	381
	382	/*
	383	* cn_proc_init - initialization entry point
	384	*
	385	* Adds the connector callback to the connector driver.
	386	*/
	387	static int __init cn_proc_init(void)
	388	{
f3c48ecc VI	389	int err = cn_add_callback(&cn_proc_event_id,
	390	"cn_proc",
	391	&cn_proc_mcast_ctl);
	392	if (err) {
	393	pr_warn("cn_proc failed to register\n");
9f46080c MH	394	return err;
	395	}
	396	return 0;
	397	}
	398
	399	module_init(cn_proc_init);