[GitHub/mt8127/android_kernel_alcatel_ttab.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 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] __aligned(8);
	struct timespec ts;
	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));
	get_seq(&msg->seq, &ev->cpu);
	ktime_get_ts(&ts); /* get high res monotonic timestamp */
	ev->timestamp_ns = timespec_to_ns(&ts);
	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] __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));
	get_seq(&msg->seq, &ev->cpu);
	ktime_get_ts(&ts); /* get high res monotonic timestamp */
	ev->timestamp_ns = timespec_to_ns(&ts);
	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] __aligned(8);
	struct timespec ts;
	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();
	get_seq(&msg->seq, &ev->cpu);
	ktime_get_ts(&ts); /* get high res monotonic timestamp */
	ev->timestamp_ns = timespec_to_ns(&ts);

	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] __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));
	get_seq(&msg->seq, &ev->cpu);
	ktime_get_ts(&ts); /* get high res monotonic timestamp */
	ev->timestamp_ns = timespec_to_ns(&ts);
	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] __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));
	get_seq(&msg->seq, &ev->cpu);
	ktime_get_ts(&ts); /* get high res monotonic timestamp */
	ev->timestamp_ns = timespec_to_ns(&ts);
	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] __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));
	get_seq(&msg->seq, &ev->cpu);
	ktime_get_ts(&ts); /* get high res monotonic timestamp */
	ev->timestamp_ns = timespec_to_ns(&ts);
	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] __aligned(8);
	struct timespec ts;

	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));
	get_seq(&msg->seq, &ev->cpu);
	ktime_get_ts(&ts); /* get high res monotonic timestamp */
	ev->timestamp_ns = timespec_to_ns(&ts);
	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] __aligned(8);
	struct timespec ts;

	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));
	get_seq(&msg->seq, &ev->cpu);
	ktime_get_ts(&ts); /* get high res monotonic timestamp */
	ev->timestamp_ns = timespec_to_ns(&ts);
	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] __aligned(8);
	struct timespec ts;

	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;
	ktime_get_ts(&ts); /* get high res monotonic timestamp */
	ev->timestamp_ns = timespec_to_ns(&ts);
	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 (!__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
f0173a11 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 };
	58
	59	static inline void get_seq(__u32 ts, int cpu)
	60	{
3ea9f683	61	preempt_disable();
f3c48ecc	62	*ts = __this_cpu_inc_return(proc_event_counts) - 1;
9f46080c	63	*cpu = smp_processor_id();
3ea9f683	64	preempt_enable();
9f46080c MH	65	}
	66
	67	void proc_fork_connector(struct task_struct *task)
	68	{
	69	struct cn_msg *msg;
	70	struct proc_event *ev;
f0173a11	71	__u8 buffer[CN_PROC_MSG_SIZE] __aligned(8);
822cfbff	72	struct timespec ts;
9e8f90df	73	struct task_struct *parent;
9f46080c MH	74
	75	if (atomic_read(&proc_event_num_listeners) < 1)
	76	return;
	77
f0173a11	78	msg = buffer_to_cn_msg(buffer);
f3c48ecc	79	ev = (struct proc_event *)msg->data;
df6ae0dc	80	memset(&ev->event_data, 0, sizeof(ev->event_data));
9f46080c	81	get_seq(&msg->seq, &ev->cpu);
822cfbff	82	ktime_get_ts(&ts); /* get high res monotonic timestamp */
f0173a11	83	ev->timestamp_ns = timespec_to_ns(&ts);
9f46080c	84	ev->what = PROC_EVENT_FORK;
9e8f90df ON	85	rcu_read_lock();
	86	parent = rcu_dereference(task->real_parent);
	87	ev->event_data.fork.parent_pid = parent->pid;
	88	ev->event_data.fork.parent_tgid = parent->tgid;
	89	rcu_read_unlock();
9f46080c MH	90	ev->event_data.fork.child_pid = task->pid;
	91	ev->event_data.fork.child_tgid = task->tgid;
	92
	93	memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
	94	msg->ack = 0; /* not used */
	95	msg->len = sizeof(*ev);
df6ae0dc	96	msg->flags = 0; /* not used */
9f46080c MH	97	/* If cn_netlink_send() failed, the data is not sent */
	98	cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
	99	}
	100
	101	void proc_exec_connector(struct task_struct *task)
	102	{
	103	struct cn_msg *msg;
	104	struct proc_event *ev;
822cfbff	105	struct timespec ts;
f0173a11	106	__u8 buffer[CN_PROC_MSG_SIZE] __aligned(8);
9f46080c MH	107
	108	if (atomic_read(&proc_event_num_listeners) < 1)
	109	return;
	110
f0173a11	111	msg = buffer_to_cn_msg(buffer);
f3c48ecc	112	ev = (struct proc_event *)msg->data;
df6ae0dc	113	memset(&ev->event_data, 0, sizeof(ev->event_data));
9f46080c	114	get_seq(&msg->seq, &ev->cpu);
822cfbff	115	ktime_get_ts(&ts); /* get high res monotonic timestamp */
f0173a11	116	ev->timestamp_ns = timespec_to_ns(&ts);
9f46080c MH	117	ev->what = PROC_EVENT_EXEC;
	118	ev->event_data.exec.process_pid = task->pid;
	119	ev->event_data.exec.process_tgid = task->tgid;
	120
	121	memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
	122	msg->ack = 0; /* not used */
	123	msg->len = sizeof(*ev);
df6ae0dc	124	msg->flags = 0; /* not used */
9f46080c MH	125	cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
	126	}
	127
	128	void proc_id_connector(struct task_struct *task, int which_id)
	129	{
	130	struct cn_msg *msg;
	131	struct proc_event *ev;
f0173a11	132	__u8 buffer[CN_PROC_MSG_SIZE] __aligned(8);
822cfbff	133	struct timespec ts;
c69e8d9c	134	const struct cred *cred;
9f46080c MH	135
	136	if (atomic_read(&proc_event_num_listeners) < 1)
	137	return;
	138
f0173a11	139	msg = buffer_to_cn_msg(buffer);
f3c48ecc	140	ev = (struct proc_event *)msg->data;
df6ae0dc	141	memset(&ev->event_data, 0, sizeof(ev->event_data));
9f46080c MH	142	ev->what = which_id;
	143	ev->event_data.id.process_pid = task->pid;
	144	ev->event_data.id.process_tgid = task->tgid;
c69e8d9c DH	145	rcu_read_lock();
c69e8d9c DH	146	cred = __task_cred(task);
9f46080c	147	if (which_id == PROC_EVENT_UID) {
9582d901 EB	148	ev->event_data.id.r.ruid = from_kuid_munged(&init_user_ns, cred->uid);
9582d901 EB	149	ev->event_data.id.e.euid = from_kuid_munged(&init_user_ns, cred->euid);
9f46080c	150	} else if (which_id == PROC_EVENT_GID) {
9582d901 EB	151	ev->event_data.id.r.rgid = from_kgid_munged(&init_user_ns, cred->gid);
9582d901 EB	152	ev->event_data.id.e.egid = from_kgid_munged(&init_user_ns, cred->egid);
c69e8d9c DH	153	} else {
c69e8d9c DH	154	rcu_read_unlock();
f3c48ecc	155	return;
c69e8d9c DH	156	}
c69e8d9c DH	157	rcu_read_unlock();
9f46080c	158	get_seq(&msg->seq, &ev->cpu);
822cfbff	159	ktime_get_ts(&ts); /* get high res monotonic timestamp */
f0173a11	160	ev->timestamp_ns = timespec_to_ns(&ts);
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);
df6ae0dc	165	msg->flags = 0; /* not used */
9f46080c MH	166	cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
	167	}
	168
02b51df1 SJR	169	void proc_sid_connector(struct task_struct *task)
	170	{
	171	struct cn_msg *msg;
	172	struct proc_event *ev;
	173	struct timespec ts;
f0173a11	174	__u8 buffer[CN_PROC_MSG_SIZE] __aligned(8);
02b51df1 SJR	175
	176	if (atomic_read(&proc_event_num_listeners) < 1)
	177	return;
	178
f0173a11	179	msg = buffer_to_cn_msg(buffer);
02b51df1	180	ev = (struct proc_event *)msg->data;
df6ae0dc	181	memset(&ev->event_data, 0, sizeof(ev->event_data));
02b51df1 SJR	182	get_seq(&msg->seq, &ev->cpu);
02b51df1 SJR	183	ktime_get_ts(&ts); /* get high res monotonic timestamp */
f0173a11	184	ev->timestamp_ns = timespec_to_ns(&ts);
02b51df1 SJR	185	ev->what = PROC_EVENT_SID;
	186	ev->event_data.sid.process_pid = task->pid;
	187	ev->event_data.sid.process_tgid = task->tgid;
	188
	189	memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
	190	msg->ack = 0; /* not used */
	191	msg->len = sizeof(*ev);
df6ae0dc	192	msg->flags = 0; /* not used */
02b51df1 SJR	193	cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
	194	}
	195
f701e5b7 VZ	196	void proc_ptrace_connector(struct task_struct *task, int ptrace_id)
	197	{
	198	struct cn_msg *msg;
	199	struct proc_event *ev;
	200	struct timespec ts;
f0173a11	201	__u8 buffer[CN_PROC_MSG_SIZE] __aligned(8);
f701e5b7 VZ	202
	203	if (atomic_read(&proc_event_num_listeners) < 1)
	204	return;
	205
f0173a11	206	msg = buffer_to_cn_msg(buffer);
f701e5b7	207	ev = (struct proc_event *)msg->data;
df6ae0dc	208	memset(&ev->event_data, 0, sizeof(ev->event_data));
f701e5b7 VZ	209	get_seq(&msg->seq, &ev->cpu);
f701e5b7 VZ	210	ktime_get_ts(&ts); /* get high res monotonic timestamp */
f0173a11	211	ev->timestamp_ns = timespec_to_ns(&ts);
f701e5b7 VZ	212	ev->what = PROC_EVENT_PTRACE;
	213	ev->event_data.ptrace.process_pid = task->pid;
	214	ev->event_data.ptrace.process_tgid = task->tgid;
	215	if (ptrace_id == PTRACE_ATTACH) {
	216	ev->event_data.ptrace.tracer_pid = current->pid;
	217	ev->event_data.ptrace.tracer_tgid = current->tgid;
	218	} else if (ptrace_id == PTRACE_DETACH) {
	219	ev->event_data.ptrace.tracer_pid = 0;
	220	ev->event_data.ptrace.tracer_tgid = 0;
	221	} else
	222	return;
	223
	224	memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
	225	msg->ack = 0; /* not used */
	226	msg->len = sizeof(*ev);
df6ae0dc	227	msg->flags = 0; /* not used */
f701e5b7 VZ	228	cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
	229	}
	230
f786ecba VZ	231	void proc_comm_connector(struct task_struct *task)
	232	{
	233	struct cn_msg *msg;
	234	struct proc_event *ev;
	235	struct timespec ts;
f0173a11	236	__u8 buffer[CN_PROC_MSG_SIZE] __aligned(8);
f786ecba VZ	237
	238	if (atomic_read(&proc_event_num_listeners) < 1)
	239	return;
	240
f0173a11	241	msg = buffer_to_cn_msg(buffer);
f786ecba	242	ev = (struct proc_event *)msg->data;
df6ae0dc	243	memset(&ev->event_data, 0, sizeof(ev->event_data));
f786ecba VZ	244	get_seq(&msg->seq, &ev->cpu);
f786ecba VZ	245	ktime_get_ts(&ts); /* get high res monotonic timestamp */
f0173a11	246	ev->timestamp_ns = timespec_to_ns(&ts);
f786ecba VZ	247	ev->what = PROC_EVENT_COMM;
	248	ev->event_data.comm.process_pid = task->pid;
	249	ev->event_data.comm.process_tgid = task->tgid;
	250	get_task_comm(ev->event_data.comm.comm, task);
	251
	252	memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
	253	msg->ack = 0; /* not used */
	254	msg->len = sizeof(*ev);
df6ae0dc	255	msg->flags = 0; /* not used */
2b5faa4c JD	256	cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
	257	}
	258
	259	void proc_coredump_connector(struct task_struct *task)
	260	{
	261	struct cn_msg *msg;
	262	struct proc_event *ev;
f0173a11	263	__u8 buffer[CN_PROC_MSG_SIZE] __aligned(8);
2b5faa4c JD	264	struct timespec ts;
	265
	266	if (atomic_read(&proc_event_num_listeners) < 1)
	267	return;
	268
f0173a11	269	msg = buffer_to_cn_msg(buffer);
2b5faa4c	270	ev = (struct proc_event *)msg->data;
df6ae0dc	271	memset(&ev->event_data, 0, sizeof(ev->event_data));
2b5faa4c JD	272	get_seq(&msg->seq, &ev->cpu);
2b5faa4c JD	273	ktime_get_ts(&ts); /* get high res monotonic timestamp */
f0173a11	274	ev->timestamp_ns = timespec_to_ns(&ts);
2b5faa4c JD	275	ev->what = PROC_EVENT_COREDUMP;
	276	ev->event_data.coredump.process_pid = task->pid;
	277	ev->event_data.coredump.process_tgid = task->tgid;
	278
	279	memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
	280	msg->ack = 0; /* not used */
	281	msg->len = sizeof(*ev);
df6ae0dc	282	msg->flags = 0; /* not used */
f786ecba VZ	283	cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
	284	}
	285
9f46080c MH	286	void proc_exit_connector(struct task_struct *task)
	287	{
	288	struct cn_msg *msg;
	289	struct proc_event *ev;
f0173a11	290	__u8 buffer[CN_PROC_MSG_SIZE] __aligned(8);
822cfbff	291	struct timespec ts;
9f46080c MH	292
	293	if (atomic_read(&proc_event_num_listeners) < 1)
	294	return;
	295
f0173a11	296	msg = buffer_to_cn_msg(buffer);
f3c48ecc	297	ev = (struct proc_event *)msg->data;
df6ae0dc	298	memset(&ev->event_data, 0, sizeof(ev->event_data));
9f46080c	299	get_seq(&msg->seq, &ev->cpu);
822cfbff	300	ktime_get_ts(&ts); /* get high res monotonic timestamp */
f0173a11	301	ev->timestamp_ns = timespec_to_ns(&ts);
9f46080c MH	302	ev->what = PROC_EVENT_EXIT;
	303	ev->event_data.exit.process_pid = task->pid;
	304	ev->event_data.exit.process_tgid = task->tgid;
	305	ev->event_data.exit.exit_code = task->exit_code;
	306	ev->event_data.exit.exit_signal = task->exit_signal;
	307
	308	memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
	309	msg->ack = 0; /* not used */
	310	msg->len = sizeof(*ev);
df6ae0dc	311	msg->flags = 0; /* not used */
9f46080c MH	312	cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
	313	}
	314
	315	/*
	316	* Send an acknowledgement message to userspace
	317	*
	318	* Use 0 for success, EFOO otherwise.
	319	* Note: this is the negative of conventional kernel error
	320	* values because it's not being returned via syscall return
	321	* mechanisms.
	322	*/
	323	static void cn_proc_ack(int err, int rcvd_seq, int rcvd_ack)
	324	{
	325	struct cn_msg *msg;
	326	struct proc_event *ev;
f0173a11	327	__u8 buffer[CN_PROC_MSG_SIZE] __aligned(8);
822cfbff	328	struct timespec ts;
9f46080c MH	329
	330	if (atomic_read(&proc_event_num_listeners) < 1)
	331	return;
	332
f0173a11	333	msg = buffer_to_cn_msg(buffer);
f3c48ecc	334	ev = (struct proc_event *)msg->data;
df6ae0dc	335	memset(&ev->event_data, 0, sizeof(ev->event_data));
9f46080c	336	msg->seq = rcvd_seq;
822cfbff	337	ktime_get_ts(&ts); /* get high res monotonic timestamp */
f0173a11	338	ev->timestamp_ns = timespec_to_ns(&ts);
9f46080c MH	339	ev->cpu = -1;
	340	ev->what = PROC_EVENT_NONE;
	341	ev->event_data.ack.err = err;
	342	memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
	343	msg->ack = rcvd_ack + 1;
	344	msg->len = sizeof(*ev);
df6ae0dc	345	msg->flags = 0; /* not used */
9f46080c MH	346	cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
	347	}
	348
	349	/**
	350	* cn_proc_mcast_ctl
	351	* @data: message sent from userspace via the connector
	352	*/
f0b25932 SB	353	static void cn_proc_mcast_ctl(struct cn_msg *msg,
f0b25932 SB	354	struct netlink_skb_parms *nsp)
9f46080c	355	{
9f46080c MH	356	enum proc_cn_mcast_op *mc_op = NULL;
	357	int err = 0;
	358
	359	if (msg->len != sizeof(*mc_op))
	360	return;
	361
9582d901 EB	362	/*
	363	* Events are reported with respect to the initial pid
	364	* and user namespaces so ignore requestors from
	365	* other namespaces.
	366	*/
	367	if ((current_user_ns() != &init_user_ns) \|\|
	368	(task_active_pid_ns(current) != &init_pid_ns))
	369	return;
	370
e70ab977	371	/* Can only change if privileged. */
1141a455	372	if (!__netlink_ns_capable(nsp, &init_user_ns, CAP_NET_ADMIN)) {
e70ab977 KC	373	err = EPERM;
	374	goto out;
	375	}
	376
f3c48ecc	377	mc_op = (enum proc_cn_mcast_op *)msg->data;
9f46080c MH	378	switch (*mc_op) {
	379	case PROC_CN_MCAST_LISTEN:
	380	atomic_inc(&proc_event_num_listeners);
	381	break;
	382	case PROC_CN_MCAST_IGNORE:
	383	atomic_dec(&proc_event_num_listeners);
	384	break;
	385	default:
	386	err = EINVAL;
	387	break;
	388	}
e70ab977 KC	389
e70ab977 KC	390	out:
9f46080c MH	391	cn_proc_ack(err, msg->seq, msg->ack);
	392	}
	393
	394	/*
	395	* cn_proc_init - initialization entry point
	396	*
	397	* Adds the connector callback to the connector driver.
	398	*/
	399	static int __init cn_proc_init(void)
	400	{
f3c48ecc VI	401	int err = cn_add_callback(&cn_proc_event_id,
	402	"cn_proc",
	403	&cn_proc_mcast_ctl);
	404	if (err) {
	405	pr_warn("cn_proc failed to register\n");
9f46080c MH	406	return err;
	407	}
	408	return 0;
	409	}
	410
	411	module_init(cn_proc_init);