412 lines
12 KiB
C
412 lines
12 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 <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, 0, 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, 0, 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, 0, 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, 0, 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, 0, 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, 0, 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, 0, 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, 0, 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, 0, 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);
|