Release 4.11 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/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);
}

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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();
}

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20
35.09%
1
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Christoph Lameter
8
14.04%
1
33.33%
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3
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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);
}

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Matt Helsley
144
70.59%
2
25.00%
Mathias Krause
24
11.76%
1
12.50%
Oleg Nesterov
21
10.29%
1
12.50%
Chris Metcalf
11
5.39%
1
12.50%
Thomas Gleixner
2
0.98%
1
12.50%
Chandra Seetharaman
1
0.49%
1
12.50%
Aaron Campbell
1
0.49%
1
12.50%
Total
204
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8
100.00%



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);
}

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Matt Helsley
122
76.25%
2
33.33%
Mathias Krause
24
15.00%
1
16.67%
Chris Metcalf
11
6.88%
1
16.67%
Thomas Gleixner
2
1.25%
1
16.67%
Aaron Campbell
1
0.62%
1
16.67%
Total
160
100.00%
6
100.00%



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);
}

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Matt Helsley
192
67.13%
2
22.22%
David Howells
32
11.19%
2
22.22%
Eric W. Biedermann
24
8.39%
1
11.11%
Mathias Krause
24
8.39%
1
11.11%
Chris Metcalf
11
3.85%
1
11.11%
Thomas Gleixner
2
0.70%
1
11.11%
Aaron Campbell
1
0.35%
1
11.11%
Total
286
100.00%
9
100.00%



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);
}

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Mathias Krause
24
15.00%
1
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Chris Metcalf
11
6.88%
1
20.00%
Thomas Gleixner
2
1.25%
1
20.00%
Aaron Campbell
1
0.62%
1
20.00%
Total
160
100.00%
5
100.00%



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);
}

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Mathias Krause
24
10.62%
1
20.00%
Chris Metcalf
11
4.87%
1
20.00%
Thomas Gleixner
2
0.88%
1
20.00%
Aaron Campbell
1
0.44%
1
20.00%
Total
226
100.00%
5
100.00%



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);
}

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24
13.87%
1
16.67%
Chris Metcalf
11
6.36%
1
16.67%
Jesper Derehag
10
5.78%
1
16.67%
Thomas Gleixner
2
1.16%
1
16.67%
Aaron Campbell
1
0.58%
1
16.67%
Total
173
100.00%
6
100.00%



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);
}

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112
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16.67%
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24
15.00%
1
16.67%
Chris Metcalf
11
6.88%
1
16.67%
Vladimir Zapolskiy
10
6.25%
1
16.67%
Thomas Gleixner
2
1.25%
1
16.67%
Aaron Campbell
1
0.62%
1
16.67%
Total
160
100.00%
6
100.00%



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);
}

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Matt Helsley
146
79.35%
2
33.33%
Mathias Krause
24
13.04%
1
16.67%
Chris Metcalf
11
5.98%
1
16.67%
Thomas Gleixner
2
1.09%
1
16.67%
Aaron Campbell
1
0.54%
1
16.67%
Total
184
100.00%
6
100.00%

/*
 * 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);
}

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Matt Helsley
127
76.97%
2
33.33%
Mathias Krause
24
14.55%
1
16.67%
Chris Metcalf
11
6.67%
1
16.67%
Thomas Gleixner
2
1.21%
1
16.67%
Aaron Campbell
1
0.61%
1
16.67%
Total
165
100.00%
6
100.00%

/**
 * 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);
}

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91
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16.67%
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28
19.31%
2
33.33%
Kees Cook
19
13.10%
1
16.67%
Stephen Boyd
5
3.45%
1
16.67%
Mike Frysinger
2
1.38%
1
16.67%
Total
145
100.00%
6
100.00%

/*
 * 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;
}
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6
15.00%
1
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Total
40
100.00%
2
100.00%


device_initcall(cn_proc_init);
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14.81%
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326
15.74%
2
7.41%
Mathias Krause
216
10.43%
1
3.70%
Chris Metcalf
138
6.66%
1
3.70%
Jesper Derehag
122
5.89%
1
3.70%
Scott James Remnant
122
5.89%
1
3.70%
Eric W. Biedermann
55
2.66%
2
7.41%
Aaron Campbell
38
1.83%
1
3.70%
David Howells
32
1.55%
2
7.41%
Oleg Nesterov
21
1.01%
1
3.70%
Kees Cook
19
0.92%
1
3.70%
Thomas Gleixner
18
0.87%
1
3.70%
Christoph Lameter
8
0.39%
1
3.70%
Valentin Ilie
6
0.29%
1
3.70%
Stephen Boyd
5
0.24%
1
3.70%
Tejun Heo
3
0.14%
1
3.70%
Mike Frysinger
2
0.10%
1
3.70%
Arun Sharma
1
0.05%
1
3.70%
Chandra Seetharaman
1
0.05%
1
3.70%
David S. Miller
1
0.05%
1
3.70%
Paul Gortmaker
1
0.05%
1
3.70%
Total
2071
100.00%
27
100.00%
Directory: drivers/connector

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