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

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * 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.
 */

#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>
#include <linux/local_lock.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 };

/* local_event.count is used as the sequence number of the netlink message */
struct local_event {
	local_lock_t lock;
	__u32 count;
};
static DEFINE_PER_CPU(struct local_event, local_event) = {
	.lock = INIT_LOCAL_LOCK(lock),
};

static int cn_filter(struct sock *dsk, struct sk_buff *skb, void *data)
{
	__u32 what, exit_code, *ptr;
	enum proc_cn_mcast_op mc_op;
	uintptr_t val;

	if (!dsk || !dsk->sk_user_data || !data)
		return 0;

	ptr = (__u32 *)data;
	what = *ptr++;
	exit_code = *ptr;
	val = ((struct proc_input *)(dsk->sk_user_data))->event_type;
	mc_op = ((struct proc_input *)(dsk->sk_user_data))->mcast_op;

	if (mc_op == PROC_CN_MCAST_IGNORE)
		return 1;

	if ((__u32)val == PROC_EVENT_ALL)
		return 0;

	/*
	 * Drop packet if we have to report only non-zero exit status
	 * (PROC_EVENT_NONZERO_EXIT) and exit status is 0
	 */
	if (((__u32)val & PROC_EVENT_NONZERO_EXIT) &&
	    (what == PROC_EVENT_EXIT)) {
		if (exit_code)
			return 0;
	}

	if ((__u32)val & what)
		return 0;

	return 1;
}

static inline void send_msg(struct cn_msg *msg)
{
	__u32 filter_data[2];

	local_lock(&local_event.lock);

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

	/*
	 * local_lock() disables preemption during send to ensure the messages
	 * are ordered according to their sequence numbers.
	 *
	 * If cn_netlink_send() fails, the data is not sent.
	 */
	filter_data[0] = ((struct proc_event *)msg->data)->what;
	if (filter_data[0] == PROC_EVENT_EXIT) {
		filter_data[1] =
		((struct proc_event *)msg->data)->event_data.exit.exit_code;
	} else {
		filter_data[1] = 0;
	}

	cn_netlink_send_mult(msg, msg->len, 0, CN_IDX_PROC, GFP_NOWAIT,
			     cn_filter, (void *)filter_data);

	local_unlock(&local_event.lock);
}

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;
	struct task_struct *parent;
	__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;

	rcu_read_lock();
	if (pid_alive(task)) {
		parent = rcu_dereference(task->real_parent);
		ev->event_data.coredump.parent_pid = parent->pid;
		ev->event_data.coredump.parent_tgid = parent->tgid;
	}
	rcu_read_unlock();

	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;
	struct task_struct *parent;
	__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;

	rcu_read_lock();
	if (pid_alive(task)) {
		parent = rcu_dereference(task->real_parent);
		ev->event_data.exit.parent_pid = parent->pid;
		ev->event_data.exit.parent_tgid = parent->tgid;
	}
	rcu_read_unlock();

	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
 * @msg: message sent from userspace via the connector
 * @nsp: NETLINK_CB of the client's socket buffer
 */
static void cn_proc_mcast_ctl(struct cn_msg *msg,
			      struct netlink_skb_parms *nsp)
{
	enum proc_cn_mcast_op mc_op = 0, prev_mc_op = 0;
	struct proc_input *pinput = NULL;
	enum proc_cn_event ev_type = 0;
	int err = 0, initial = 0;
	struct sock *sk = NULL;

	/* 
	 * 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_is_in_init_pid_ns(current))
		return;

	if (msg->len == sizeof(*pinput)) {
		pinput = (struct proc_input *)msg->data;
		mc_op = pinput->mcast_op;
		ev_type = pinput->event_type;
	} else if (msg->len == sizeof(mc_op)) {
		mc_op = *((enum proc_cn_mcast_op *)msg->data);
		ev_type = PROC_EVENT_ALL;
	} else {
		return;
	}

	ev_type = valid_event((enum proc_cn_event)ev_type);

	if (ev_type == PROC_EVENT_NONE)
		ev_type = PROC_EVENT_ALL;

	if (nsp->sk) {
		sk = nsp->sk;
		if (sk->sk_user_data == NULL) {
			sk->sk_user_data = kzalloc(sizeof(struct proc_input),
						   GFP_KERNEL);
			if (sk->sk_user_data == NULL) {
				err = ENOMEM;
				goto out;
			}
			initial = 1;
		} else {
			prev_mc_op =
			((struct proc_input *)(sk->sk_user_data))->mcast_op;
		}
		((struct proc_input *)(sk->sk_user_data))->event_type =
			ev_type;
		((struct proc_input *)(sk->sk_user_data))->mcast_op = mc_op;
	}

	switch (mc_op) {
	case PROC_CN_MCAST_LISTEN:
		if (initial || (prev_mc_op != PROC_CN_MCAST_LISTEN))
			atomic_inc(&proc_event_num_listeners);
		break;
	case PROC_CN_MCAST_IGNORE:
		if (!initial && (prev_mc_op != PROC_CN_MCAST_IGNORE))
			atomic_dec(&proc_event_num_listeners);
		((struct proc_input *)(sk->sk_user_data))->event_type =
			PROC_EVENT_NONE;
		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;
}
device_initcall(cn_proc_init);
Commit	Line	Data
1a59d1b8	1	// SPDX-License-Identifier: GPL-2.0-or-later
9f46080c MH	2	/*
	3	* cn_proc.c - process events connector
	4	*
	5	* Copyright (C) Matt Helsley, IBM Corp. 2005
	6	* Based on cn_fork.c by Guillaume Thouvenin <guillaume.thouvenin@bull.net>
	7	* Original copyright notice follows:
	8	* Copyright (C) 2005 BULL SA.
9f46080c MH	9	*/
9f46080c MH	10
9f46080c	11	#include <linux/kernel.h>
caf3c9dc	12	#include <linux/ktime.h>
9f46080c	13	#include <linux/init.h>
1d31a4ea	14	#include <linux/connector.h>
5a0e3ad6	15	#include <linux/gfp.h>
f701e5b7	16	#include <linux/ptrace.h>
60063497	17	#include <linux/atomic.h>
9582d901	18	#include <linux/pid_namespace.h>
60063497	19
9f46080c	20	#include <linux/cn_proc.h>
3e92fd7b	21	#include <linux/local_lock.h>
9f46080c	22
1ca1a4cf CM	23	/*
	24	* Size of a cn_msg followed by a proc_event structure. Since the
	25	* sizeof struct cn_msg is a multiple of 4 bytes, but not 8 bytes, we
	26	* add one 4-byte word to the size here, and then start the actual
	27	* cn_msg structure 4 bytes into the stack buffer. The result is that
	28	* the immediately following proc_event structure is aligned to 8 bytes.
	29	*/
	30	#define CN_PROC_MSG_SIZE (sizeof(struct cn_msg) + sizeof(struct proc_event) + 4)
	31
	32	/* See comment above; we test our assumption about sizeof struct cn_msg here. */
	33	static inline struct cn_msg buffer_to_cn_msg(__u8 buffer)
	34	{
	35	BUILD_BUG_ON(sizeof(struct cn_msg) != 20);
	36	return (struct cn_msg *)(buffer + 4);
	37	}
9f46080c MH	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
3e92fd7b MG	42	/* local_event.count is used as the sequence number of the netlink message */
	43	struct local_event {
	44	local_lock_t lock;
	45	__u32 count;
	46	};
	47	static DEFINE_PER_CPU(struct local_event, local_event) = {
	48	.lock = INIT_LOCAL_LOCK(lock),
	49	};
9f46080c	50
2aa1f7a1 AK	51	static int cn_filter(struct sock dsk, struct sk_buff skb, void *data)
2aa1f7a1 AK	52	{
743acf35	53	__u32 what, exit_code, *ptr;
2aa1f7a1	54	enum proc_cn_mcast_op mc_op;
743acf35	55	uintptr_t val;
2aa1f7a1	56
9644bc49	57	if (!dsk \|\| !dsk->sk_user_data \|\| !data)
2aa1f7a1 AK	58	return 0;
2aa1f7a1 AK	59
743acf35 AK	60	ptr = (__u32 *)data;
	61	what = *ptr++;
	62	exit_code = *ptr;
	63	val = ((struct proc_input *)(dsk->sk_user_data))->event_type;
2aa1f7a1 AK	64	mc_op = ((struct proc_input *)(dsk->sk_user_data))->mcast_op;
	65
	66	if (mc_op == PROC_CN_MCAST_IGNORE)
	67	return 1;
	68
743acf35 AK	69	if ((__u32)val == PROC_EVENT_ALL)
	70	return 0;
	71
	72	/*
	73	* Drop packet if we have to report only non-zero exit status
	74	* (PROC_EVENT_NONZERO_EXIT) and exit status is 0
	75	*/
	76	if (((__u32)val & PROC_EVENT_NONZERO_EXIT) &&
	77	(what == PROC_EVENT_EXIT)) {
	78	if (exit_code)
	79	return 0;
	80	}
	81
	82	if ((__u32)val & what)
	83	return 0;
	84
	85	return 1;
2aa1f7a1 AK	86	}
2aa1f7a1 AK	87
ab8ed951	88	static inline void send_msg(struct cn_msg *msg)
9f46080c	89	{
743acf35 AK	90	__u32 filter_data[2];
743acf35 AK	91
3e92fd7b	92	local_lock(&local_event.lock);
ab8ed951	93
3e92fd7b	94	msg->seq = __this_cpu_inc_return(local_event.count) - 1;
ab8ed951 AC	95	((struct proc_event *)msg->data)->cpu = smp_processor_id();
	96
	97	/*
3e92fd7b MG	98	* local_lock() disables preemption during send to ensure the messages
3e92fd7b MG	99	* are ordered according to their sequence numbers.
ab8ed951 AC	100	*
	101	* If cn_netlink_send() fails, the data is not sent.
	102	*/
743acf35 AK	103	filter_data[0] = ((struct proc_event *)msg->data)->what;
	104	if (filter_data[0] == PROC_EVENT_EXIT) {
	105	filter_data[1] =
	106	((struct proc_event *)msg->data)->event_data.exit.exit_code;
	107	} else {
	108	filter_data[1] = 0;
	109	}
	110
8929f95b KW	111	cn_netlink_send_mult(msg, msg->len, 0, CN_IDX_PROC, GFP_NOWAIT,
8929f95b KW	112	cn_filter, (void *)filter_data);
ab8ed951	113
3e92fd7b	114	local_unlock(&local_event.lock);
9f46080c MH	115	}
	116
	117	void proc_fork_connector(struct task_struct *task)
	118	{
	119	struct cn_msg *msg;
	120	struct proc_event *ev;
1ca1a4cf	121	__u8 buffer[CN_PROC_MSG_SIZE] __aligned(8);
9e8f90df	122	struct task_struct *parent;
9f46080c MH	123
	124	if (atomic_read(&proc_event_num_listeners) < 1)
	125	return;
	126
1ca1a4cf	127	msg = buffer_to_cn_msg(buffer);
f3c48ecc	128	ev = (struct proc_event *)msg->data;
e727ca82	129	memset(&ev->event_data, 0, sizeof(ev->event_data));
9e93f21b	130	ev->timestamp_ns = ktime_get_ns();
9f46080c	131	ev->what = PROC_EVENT_FORK;
9e8f90df ON	132	rcu_read_lock();
	133	parent = rcu_dereference(task->real_parent);
	134	ev->event_data.fork.parent_pid = parent->pid;
	135	ev->event_data.fork.parent_tgid = parent->tgid;
	136	rcu_read_unlock();
9f46080c MH	137	ev->event_data.fork.child_pid = task->pid;
	138	ev->event_data.fork.child_tgid = task->tgid;
	139
	140	memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
	141	msg->ack = 0; /* not used */
	142	msg->len = sizeof(*ev);
e727ca82	143	msg->flags = 0; /* not used */
ab8ed951	144	send_msg(msg);
9f46080c MH	145	}
	146
	147	void proc_exec_connector(struct task_struct *task)
	148	{
	149	struct cn_msg *msg;
	150	struct proc_event *ev;
1ca1a4cf	151	__u8 buffer[CN_PROC_MSG_SIZE] __aligned(8);
9f46080c MH	152
	153	if (atomic_read(&proc_event_num_listeners) < 1)
	154	return;
	155
1ca1a4cf	156	msg = buffer_to_cn_msg(buffer);
f3c48ecc	157	ev = (struct proc_event *)msg->data;
e727ca82	158	memset(&ev->event_data, 0, sizeof(ev->event_data));
9e93f21b	159	ev->timestamp_ns = ktime_get_ns();
9f46080c MH	160	ev->what = PROC_EVENT_EXEC;
	161	ev->event_data.exec.process_pid = task->pid;
	162	ev->event_data.exec.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);
e727ca82	167	msg->flags = 0; /* not used */
ab8ed951	168	send_msg(msg);
9f46080c MH	169	}
	170
	171	void proc_id_connector(struct task_struct *task, int which_id)
	172	{
	173	struct cn_msg *msg;
	174	struct proc_event *ev;
1ca1a4cf	175	__u8 buffer[CN_PROC_MSG_SIZE] __aligned(8);
c69e8d9c	176	const struct cred *cred;
9f46080c MH	177
	178	if (atomic_read(&proc_event_num_listeners) < 1)
	179	return;
	180
1ca1a4cf	181	msg = buffer_to_cn_msg(buffer);
f3c48ecc	182	ev = (struct proc_event *)msg->data;
e727ca82	183	memset(&ev->event_data, 0, sizeof(ev->event_data));
9f46080c MH	184	ev->what = which_id;
	185	ev->event_data.id.process_pid = task->pid;
	186	ev->event_data.id.process_tgid = task->tgid;
c69e8d9c DH	187	rcu_read_lock();
c69e8d9c DH	188	cred = __task_cred(task);
9f46080c	189	if (which_id == PROC_EVENT_UID) {
9582d901 EB	190	ev->event_data.id.r.ruid = from_kuid_munged(&init_user_ns, cred->uid);
9582d901 EB	191	ev->event_data.id.e.euid = from_kuid_munged(&init_user_ns, cred->euid);
9f46080c	192	} else if (which_id == PROC_EVENT_GID) {
9582d901 EB	193	ev->event_data.id.r.rgid = from_kgid_munged(&init_user_ns, cred->gid);
9582d901 EB	194	ev->event_data.id.e.egid = from_kgid_munged(&init_user_ns, cred->egid);
c69e8d9c DH	195	} else {
c69e8d9c DH	196	rcu_read_unlock();
f3c48ecc	197	return;
c69e8d9c DH	198	}
c69e8d9c DH	199	rcu_read_unlock();
9e93f21b	200	ev->timestamp_ns = ktime_get_ns();
9f46080c MH	201
	202	memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
	203	msg->ack = 0; /* not used */
	204	msg->len = sizeof(*ev);
e727ca82	205	msg->flags = 0; /* not used */
ab8ed951	206	send_msg(msg);
9f46080c MH	207	}
9f46080c MH	208
02b51df1 SJR	209	void proc_sid_connector(struct task_struct *task)
	210	{
	211	struct cn_msg *msg;
	212	struct proc_event *ev;
1ca1a4cf	213	__u8 buffer[CN_PROC_MSG_SIZE] __aligned(8);
02b51df1 SJR	214
	215	if (atomic_read(&proc_event_num_listeners) < 1)
	216	return;
	217
1ca1a4cf	218	msg = buffer_to_cn_msg(buffer);
02b51df1	219	ev = (struct proc_event *)msg->data;
e727ca82	220	memset(&ev->event_data, 0, sizeof(ev->event_data));
9e93f21b	221	ev->timestamp_ns = ktime_get_ns();
02b51df1 SJR	222	ev->what = PROC_EVENT_SID;
	223	ev->event_data.sid.process_pid = task->pid;
	224	ev->event_data.sid.process_tgid = task->tgid;
	225
	226	memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
	227	msg->ack = 0; /* not used */
	228	msg->len = sizeof(*ev);
e727ca82	229	msg->flags = 0; /* not used */
ab8ed951	230	send_msg(msg);
02b51df1 SJR	231	}
02b51df1 SJR	232
f701e5b7 VZ	233	void proc_ptrace_connector(struct task_struct *task, int ptrace_id)
	234	{
	235	struct cn_msg *msg;
	236	struct proc_event *ev;
1ca1a4cf	237	__u8 buffer[CN_PROC_MSG_SIZE] __aligned(8);
f701e5b7 VZ	238
	239	if (atomic_read(&proc_event_num_listeners) < 1)
	240	return;
	241
1ca1a4cf	242	msg = buffer_to_cn_msg(buffer);
f701e5b7	243	ev = (struct proc_event *)msg->data;
e727ca82	244	memset(&ev->event_data, 0, sizeof(ev->event_data));
9e93f21b	245	ev->timestamp_ns = ktime_get_ns();
f701e5b7 VZ	246	ev->what = PROC_EVENT_PTRACE;
	247	ev->event_data.ptrace.process_pid = task->pid;
	248	ev->event_data.ptrace.process_tgid = task->tgid;
	249	if (ptrace_id == PTRACE_ATTACH) {
	250	ev->event_data.ptrace.tracer_pid = current->pid;
	251	ev->event_data.ptrace.tracer_tgid = current->tgid;
	252	} else if (ptrace_id == PTRACE_DETACH) {
	253	ev->event_data.ptrace.tracer_pid = 0;
	254	ev->event_data.ptrace.tracer_tgid = 0;
	255	} else
	256	return;
	257
	258	memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
	259	msg->ack = 0; /* not used */
	260	msg->len = sizeof(*ev);
e727ca82	261	msg->flags = 0; /* not used */
ab8ed951	262	send_msg(msg);
f701e5b7 VZ	263	}
f701e5b7 VZ	264
f786ecba VZ	265	void proc_comm_connector(struct task_struct *task)
	266	{
	267	struct cn_msg *msg;
	268	struct proc_event *ev;
1ca1a4cf	269	__u8 buffer[CN_PROC_MSG_SIZE] __aligned(8);
f786ecba VZ	270
	271	if (atomic_read(&proc_event_num_listeners) < 1)
	272	return;
	273
1ca1a4cf	274	msg = buffer_to_cn_msg(buffer);
f786ecba	275	ev = (struct proc_event *)msg->data;
e727ca82	276	memset(&ev->event_data, 0, sizeof(ev->event_data));
9e93f21b	277	ev->timestamp_ns = ktime_get_ns();
f786ecba VZ	278	ev->what = PROC_EVENT_COMM;
	279	ev->event_data.comm.process_pid = task->pid;
	280	ev->event_data.comm.process_tgid = task->tgid;
	281	get_task_comm(ev->event_data.comm.comm, task);
	282
	283	memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
	284	msg->ack = 0; /* not used */
	285	msg->len = sizeof(*ev);
e727ca82	286	msg->flags = 0; /* not used */
ab8ed951	287	send_msg(msg);
2b5faa4c JD	288	}
	289
	290	void proc_coredump_connector(struct task_struct *task)
	291	{
	292	struct cn_msg *msg;
	293	struct proc_event *ev;
6d2b0f02	294	struct task_struct *parent;
1ca1a4cf	295	__u8 buffer[CN_PROC_MSG_SIZE] __aligned(8);
2b5faa4c JD	296
	297	if (atomic_read(&proc_event_num_listeners) < 1)
	298	return;
	299
1ca1a4cf	300	msg = buffer_to_cn_msg(buffer);
2b5faa4c	301	ev = (struct proc_event *)msg->data;
e727ca82	302	memset(&ev->event_data, 0, sizeof(ev->event_data));
9e93f21b	303	ev->timestamp_ns = ktime_get_ns();
2b5faa4c JD	304	ev->what = PROC_EVENT_COREDUMP;
	305	ev->event_data.coredump.process_pid = task->pid;
	306	ev->event_data.coredump.process_tgid = task->tgid;
6d2b0f02 LR	307
	308	rcu_read_lock();
	309	if (pid_alive(task)) {
	310	parent = rcu_dereference(task->real_parent);
	311	ev->event_data.coredump.parent_pid = parent->pid;
	312	ev->event_data.coredump.parent_tgid = parent->tgid;
	313	}
	314	rcu_read_unlock();
2b5faa4c JD	315
	316	memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
	317	msg->ack = 0; /* not used */
	318	msg->len = sizeof(*ev);
e727ca82	319	msg->flags = 0; /* not used */
ab8ed951	320	send_msg(msg);
f786ecba VZ	321	}
f786ecba VZ	322
9f46080c MH	323	void proc_exit_connector(struct task_struct *task)
	324	{
	325	struct cn_msg *msg;
	326	struct proc_event *ev;
6d2b0f02	327	struct task_struct *parent;
1ca1a4cf	328	__u8 buffer[CN_PROC_MSG_SIZE] __aligned(8);
9f46080c MH	329
	330	if (atomic_read(&proc_event_num_listeners) < 1)
	331	return;
	332
1ca1a4cf	333	msg = buffer_to_cn_msg(buffer);
f3c48ecc	334	ev = (struct proc_event *)msg->data;
e727ca82	335	memset(&ev->event_data, 0, sizeof(ev->event_data));
9e93f21b	336	ev->timestamp_ns = ktime_get_ns();
9f46080c MH	337	ev->what = PROC_EVENT_EXIT;
	338	ev->event_data.exit.process_pid = task->pid;
	339	ev->event_data.exit.process_tgid = task->tgid;
	340	ev->event_data.exit.exit_code = task->exit_code;
	341	ev->event_data.exit.exit_signal = task->exit_signal;
6d2b0f02 LR	342
	343	rcu_read_lock();
	344	if (pid_alive(task)) {
	345	parent = rcu_dereference(task->real_parent);
	346	ev->event_data.exit.parent_pid = parent->pid;
	347	ev->event_data.exit.parent_tgid = parent->tgid;
	348	}
	349	rcu_read_unlock();
9f46080c MH	350
	351	memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
	352	msg->ack = 0; /* not used */
	353	msg->len = sizeof(*ev);
e727ca82	354	msg->flags = 0; /* not used */
ab8ed951	355	send_msg(msg);
9f46080c MH	356	}
	357
	358	/*
	359	* Send an acknowledgement message to userspace
	360	*
	361	* Use 0 for success, EFOO otherwise.
	362	* Note: this is the negative of conventional kernel error
	363	* values because it's not being returned via syscall return
	364	* mechanisms.
	365	*/
	366	static void cn_proc_ack(int err, int rcvd_seq, int rcvd_ack)
	367	{
	368	struct cn_msg *msg;
	369	struct proc_event *ev;
1ca1a4cf	370	__u8 buffer[CN_PROC_MSG_SIZE] __aligned(8);
9f46080c MH	371
	372	if (atomic_read(&proc_event_num_listeners) < 1)
	373	return;
	374
1ca1a4cf	375	msg = buffer_to_cn_msg(buffer);
f3c48ecc	376	ev = (struct proc_event *)msg->data;
e727ca82	377	memset(&ev->event_data, 0, sizeof(ev->event_data));
9f46080c	378	msg->seq = rcvd_seq;
9e93f21b	379	ev->timestamp_ns = ktime_get_ns();
9f46080c MH	380	ev->cpu = -1;
	381	ev->what = PROC_EVENT_NONE;
	382	ev->event_data.ack.err = err;
	383	memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
	384	msg->ack = rcvd_ack + 1;
	385	msg->len = sizeof(*ev);
e727ca82	386	msg->flags = 0; /* not used */
ab8ed951	387	send_msg(msg);
9f46080c MH	388	}
	389
	390	/**
	391	* cn_proc_mcast_ctl
743acf35 AK	392	* @msg: message sent from userspace via the connector
743acf35 AK	393	* @nsp: NETLINK_CB of the client's socket buffer
9f46080c	394	*/
f0b25932 SB	395	static void cn_proc_mcast_ctl(struct cn_msg *msg,
f0b25932 SB	396	struct netlink_skb_parms *nsp)
9f46080c	397	{
2aa1f7a1	398	enum proc_cn_mcast_op mc_op = 0, prev_mc_op = 0;
743acf35 AK	399	struct proc_input *pinput = NULL;
743acf35 AK	400	enum proc_cn_event ev_type = 0;
2aa1f7a1 AK	401	int err = 0, initial = 0;
2aa1f7a1 AK	402	struct sock *sk = NULL;
9f46080c	403
9582d901 EB	404	/*
	405	* Events are reported with respect to the initial pid
	406	* and user namespaces so ignore requestors from
	407	* other namespaces.
	408	*/
	409	if ((current_user_ns() != &init_user_ns) \|\|
42c66d16	410	!task_is_in_init_pid_ns(current))
9582d901 EB	411	return;
9582d901 EB	412
743acf35 AK	413	if (msg->len == sizeof(*pinput)) {
	414	pinput = (struct proc_input *)msg->data;
	415	mc_op = pinput->mcast_op;
	416	ev_type = pinput->event_type;
	417	} else if (msg->len == sizeof(mc_op)) {
2aa1f7a1	418	mc_op = ((enum proc_cn_mcast_op )msg->data);
743acf35 AK	419	ev_type = PROC_EVENT_ALL;
743acf35 AK	420	} else {
2aa1f7a1	421	return;
743acf35 AK	422	}
	423
	424	ev_type = valid_event((enum proc_cn_event)ev_type);
	425
	426	if (ev_type == PROC_EVENT_NONE)
	427	ev_type = PROC_EVENT_ALL;
2aa1f7a1 AK	428
	429	if (nsp->sk) {
	430	sk = nsp->sk;
	431	if (sk->sk_user_data == NULL) {
	432	sk->sk_user_data = kzalloc(sizeof(struct proc_input),
	433	GFP_KERNEL);
	434	if (sk->sk_user_data == NULL) {
	435	err = ENOMEM;
	436	goto out;
	437	}
	438	initial = 1;
	439	} else {
	440	prev_mc_op =
	441	((struct proc_input *)(sk->sk_user_data))->mcast_op;
	442	}
743acf35 AK	443	((struct proc_input *)(sk->sk_user_data))->event_type =
743acf35 AK	444	ev_type;
2aa1f7a1 AK	445	((struct proc_input *)(sk->sk_user_data))->mcast_op = mc_op;
	446	}
	447
	448	switch (mc_op) {
9f46080c	449	case PROC_CN_MCAST_LISTEN:
2aa1f7a1 AK	450	if (initial \|\| (prev_mc_op != PROC_CN_MCAST_LISTEN))
2aa1f7a1 AK	451	atomic_inc(&proc_event_num_listeners);
9f46080c MH	452	break;
9f46080c MH	453	case PROC_CN_MCAST_IGNORE:
2aa1f7a1 AK	454	if (!initial && (prev_mc_op != PROC_CN_MCAST_IGNORE))
2aa1f7a1 AK	455	atomic_dec(&proc_event_num_listeners);
743acf35 AK	456	((struct proc_input *)(sk->sk_user_data))->event_type =
743acf35 AK	457	PROC_EVENT_NONE;
9f46080c MH	458	break;
	459	default:
	460	err = EINVAL;
	461	break;
	462	}
e70ab977 KC	463
e70ab977 KC	464	out:
9f46080c MH	465	cn_proc_ack(err, msg->seq, msg->ack);
	466	}
	467
	468	/*
	469	* cn_proc_init - initialization entry point
	470	*
	471	* Adds the connector callback to the connector driver.
	472	*/
	473	static int __init cn_proc_init(void)
	474	{
f3c48ecc VI	475	int err = cn_add_callback(&cn_proc_event_id,
	476	"cn_proc",
	477	&cn_proc_mcast_ctl);
	478	if (err) {
	479	pr_warn("cn_proc failed to register\n");
9f46080c MH	480	return err;
	481	}
	482	return 0;
	483	}
8297f2d9	484	device_initcall(cn_proc_init);