240 строки
6.6 KiB
C
240 строки
6.6 KiB
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 <asm/atomic.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)
|
|
{
|
|
*ts = get_cpu_var(proc_event_counts)++;
|
|
*cpu = smp_processor_id();
|
|
put_cpu_var(proc_event_counts);
|
|
}
|
|
|
|
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;
|
|
|
|
if (atomic_read(&proc_event_num_listeners) < 1)
|
|
return;
|
|
|
|
msg = (struct cn_msg*)buffer;
|
|
ev = (struct proc_event*)msg->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;
|
|
ev->event_data.fork.parent_pid = task->real_parent->pid;
|
|
ev->event_data.fork.parent_tgid = task->real_parent->tgid;
|
|
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);
|
|
/* 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;
|
|
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);
|
|
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;
|
|
|
|
if (atomic_read(&proc_event_num_listeners) < 1)
|
|
return;
|
|
|
|
msg = (struct cn_msg*)buffer;
|
|
ev = (struct proc_event*)msg->data;
|
|
ev->what = which_id;
|
|
ev->event_data.id.process_pid = task->pid;
|
|
ev->event_data.id.process_tgid = task->tgid;
|
|
if (which_id == PROC_EVENT_UID) {
|
|
ev->event_data.id.r.ruid = task->uid;
|
|
ev->event_data.id.e.euid = task->euid;
|
|
} else if (which_id == PROC_EVENT_GID) {
|
|
ev->event_data.id.r.rgid = task->gid;
|
|
ev->event_data.id.e.egid = task->egid;
|
|
} else
|
|
return;
|
|
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);
|
|
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;
|
|
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);
|
|
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;
|
|
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);
|
|
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(void *data)
|
|
{
|
|
struct cn_msg *msg = data;
|
|
enum proc_cn_mcast_op *mc_op = NULL;
|
|
int err = 0;
|
|
|
|
if (msg->len != sizeof(*mc_op))
|
|
return;
|
|
|
|
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;
|
|
}
|
|
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;
|
|
|
|
if ((err = cn_add_callback(&cn_proc_event_id, "cn_proc",
|
|
&cn_proc_mcast_ctl))) {
|
|
printk(KERN_WARNING "cn_proc failed to register\n");
|
|
return err;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
module_init(cn_proc_init);
|