[PATCH] Process Events Connector
This patch adds a connector that reports fork, exec, id change, and exit events for all processes to userspace. It replaces the fork_advisor patch that ELSA is currently using. Applications that may find these events useful include accounting/auditing (e.g. ELSA), system activity monitoring (e.g. top), security, and resource management (e.g. CKRM). Signed-off-by: Matt Helsley <matthltc@us.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Matt Helsley
Linus Torvalds
parent
49364ce253
commit
9f46080c41
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@ -10,4 +10,12 @@ config CONNECTOR
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Connector support can also be built as a module. If so, the module
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will be called cn.ko.
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config PROC_EVENTS
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boolean "Report process events to userspace"
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depends on CONNECTOR=y
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default y
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---help---
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Provide a connector that reports process events to userspace. Send
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events such as fork, exec, id change (uid, gid, suid, etc), and exit.
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endmenu
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@ -1,3 +1,4 @@
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obj-$(CONFIG_CONNECTOR) += cn.o
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obj-$(CONFIG_PROC_EVENTS) += cn_proc.o
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cn-y += cn_queue.o connector.o
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@ -0,0 +1,222 @@
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/*
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* cn_proc.c - process events connector
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*
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* Copyright (C) Matt Helsley, IBM Corp. 2005
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* Based on cn_fork.c by Guillaume Thouvenin <guillaume.thouvenin@bull.net>
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* Original copyright notice follows:
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* Copyright (C) 2005 BULL SA.
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <asm/atomic.h>
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#include <linux/cn_proc.h>
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#define CN_PROC_MSG_SIZE (sizeof(struct cn_msg) + sizeof(struct proc_event))
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static atomic_t proc_event_num_listeners = ATOMIC_INIT(0);
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static struct cb_id cn_proc_event_id = { CN_IDX_PROC, CN_VAL_PROC };
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/* proc_counts is used as the sequence number of the netlink message */
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static DEFINE_PER_CPU(__u32, proc_event_counts) = { 0 };
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static inline void get_seq(__u32 *ts, int *cpu)
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{
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*ts = get_cpu_var(proc_event_counts)++;
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*cpu = smp_processor_id();
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put_cpu_var(proc_counts);
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}
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void proc_fork_connector(struct task_struct *task)
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{
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struct cn_msg *msg;
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struct proc_event *ev;
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__u8 buffer[CN_PROC_MSG_SIZE];
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if (atomic_read(&proc_event_num_listeners) < 1)
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return;
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msg = (struct cn_msg*)buffer;
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ev = (struct proc_event*)msg->data;
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get_seq(&msg->seq, &ev->cpu);
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ev->what = PROC_EVENT_FORK;
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ev->event_data.fork.parent_pid = task->real_parent->pid;
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ev->event_data.fork.parent_tgid = task->real_parent->tgid;
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ev->event_data.fork.child_pid = task->pid;
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ev->event_data.fork.child_tgid = task->tgid;
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memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
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msg->ack = 0; /* not used */
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msg->len = sizeof(*ev);
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/* If cn_netlink_send() failed, the data is not sent */
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cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
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}
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void proc_exec_connector(struct task_struct *task)
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{
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struct cn_msg *msg;
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struct proc_event *ev;
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__u8 buffer[CN_PROC_MSG_SIZE];
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if (atomic_read(&proc_event_num_listeners) < 1)
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return;
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msg = (struct cn_msg*)buffer;
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ev = (struct proc_event*)msg->data;
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get_seq(&msg->seq, &ev->cpu);
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ev->what = PROC_EVENT_EXEC;
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ev->event_data.exec.process_pid = task->pid;
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ev->event_data.exec.process_tgid = task->tgid;
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memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
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msg->ack = 0; /* not used */
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msg->len = sizeof(*ev);
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cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
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}
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void proc_id_connector(struct task_struct *task, int which_id)
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{
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struct cn_msg *msg;
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struct proc_event *ev;
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__u8 buffer[CN_PROC_MSG_SIZE];
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if (atomic_read(&proc_event_num_listeners) < 1)
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return;
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msg = (struct cn_msg*)buffer;
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ev = (struct proc_event*)msg->data;
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ev->what = which_id;
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ev->event_data.id.process_pid = task->pid;
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ev->event_data.id.process_tgid = task->tgid;
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if (which_id == PROC_EVENT_UID) {
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ev->event_data.id.r.ruid = task->uid;
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ev->event_data.id.e.euid = task->euid;
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} else if (which_id == PROC_EVENT_GID) {
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ev->event_data.id.r.rgid = task->gid;
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ev->event_data.id.e.egid = task->egid;
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} else
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return;
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get_seq(&msg->seq, &ev->cpu);
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memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
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msg->ack = 0; /* not used */
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msg->len = sizeof(*ev);
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cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
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}
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void proc_exit_connector(struct task_struct *task)
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{
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struct cn_msg *msg;
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struct proc_event *ev;
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__u8 buffer[CN_PROC_MSG_SIZE];
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if (atomic_read(&proc_event_num_listeners) < 1)
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return;
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msg = (struct cn_msg*)buffer;
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ev = (struct proc_event*)msg->data;
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get_seq(&msg->seq, &ev->cpu);
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ev->what = PROC_EVENT_EXIT;
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ev->event_data.exit.process_pid = task->pid;
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ev->event_data.exit.process_tgid = task->tgid;
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ev->event_data.exit.exit_code = task->exit_code;
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ev->event_data.exit.exit_signal = task->exit_signal;
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memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
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msg->ack = 0; /* not used */
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msg->len = sizeof(*ev);
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cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
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}
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/*
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* Send an acknowledgement message to userspace
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*
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* Use 0 for success, EFOO otherwise.
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* Note: this is the negative of conventional kernel error
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* values because it's not being returned via syscall return
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* mechanisms.
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*/
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static void cn_proc_ack(int err, int rcvd_seq, int rcvd_ack)
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{
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struct cn_msg *msg;
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struct proc_event *ev;
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__u8 buffer[CN_PROC_MSG_SIZE];
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if (atomic_read(&proc_event_num_listeners) < 1)
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return;
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msg = (struct cn_msg*)buffer;
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ev = (struct proc_event*)msg->data;
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msg->seq = rcvd_seq;
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ev->cpu = -1;
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ev->what = PROC_EVENT_NONE;
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ev->event_data.ack.err = err;
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memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
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msg->ack = rcvd_ack + 1;
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msg->len = sizeof(*ev);
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cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
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}
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/**
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* cn_proc_mcast_ctl
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* @data: message sent from userspace via the connector
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*/
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static void cn_proc_mcast_ctl(void *data)
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{
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struct cn_msg *msg = data;
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enum proc_cn_mcast_op *mc_op = NULL;
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int err = 0;
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if (msg->len != sizeof(*mc_op))
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return;
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mc_op = (enum proc_cn_mcast_op*)msg->data;
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switch (*mc_op) {
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case PROC_CN_MCAST_LISTEN:
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atomic_inc(&proc_event_num_listeners);
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break;
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case PROC_CN_MCAST_IGNORE:
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atomic_dec(&proc_event_num_listeners);
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break;
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default:
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err = EINVAL;
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break;
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}
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cn_proc_ack(err, msg->seq, msg->ack);
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}
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/*
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* cn_proc_init - initialization entry point
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*
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* Adds the connector callback to the connector driver.
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*/
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static int __init cn_proc_init(void)
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{
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int err;
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if ((err = cn_add_callback(&cn_proc_event_id, "cn_proc",
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&cn_proc_mcast_ctl))) {
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printk(KERN_WARNING "cn_proc failed to register\n");
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return err;
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}
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return 0;
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}
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module_init(cn_proc_init);
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@ -48,6 +48,7 @@
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#include <linux/syscalls.h>
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#include <linux/rmap.h>
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#include <linux/acct.h>
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#include <linux/cn_proc.h>
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#include <asm/uaccess.h>
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#include <asm/mmu_context.h>
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@ -1096,6 +1097,7 @@ int search_binary_handler(struct linux_binprm *bprm,struct pt_regs *regs)
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fput(bprm->file);
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bprm->file = NULL;
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current->did_exec = 1;
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proc_exec_connector(current);
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return retval;
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}
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read_lock(&binfmt_lock);
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@ -0,0 +1,127 @@
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/*
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* cn_proc.h - process events connector
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*
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* Copyright (C) Matt Helsley, IBM Corp. 2005
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* Based on cn_fork.h by Nguyen Anh Quynh and Guillaume Thouvenin
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* Original copyright notice follows:
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* Copyright (C) 2005 Nguyen Anh Quynh <aquynh@gmail.com>
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* Copyright (C) 2005 Guillaume Thouvenin <guillaume.thouvenin@bull.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef CN_PROC_H
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#define CN_PROC_H
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#include <linux/types.h>
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#include <linux/connector.h>
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/*
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* Userspace sends this enum to register with the kernel that it is listening
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* for events on the connector.
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*/
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enum proc_cn_mcast_op {
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PROC_CN_MCAST_LISTEN = 1,
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PROC_CN_MCAST_IGNORE = 2
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};
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/*
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* From the user's point of view, the process
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* ID is the thread group ID and thread ID is the internal
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* kernel "pid". So, fields are assigned as follow:
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*
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* In user space - In kernel space
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*
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* parent process ID = parent->tgid
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* parent thread ID = parent->pid
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* child process ID = child->tgid
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* child thread ID = child->pid
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*/
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struct proc_event {
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enum what {
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/* Use successive bits so the enums can be used to record
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* sets of events as well
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*/
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PROC_EVENT_NONE = 0x00000000,
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PROC_EVENT_FORK = 0x00000001,
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PROC_EVENT_EXEC = 0x00000002,
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PROC_EVENT_UID = 0x00000004,
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PROC_EVENT_GID = 0x00000040,
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/* "next" should be 0x00000400 */
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/* "last" is the last process event: exit */
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PROC_EVENT_EXIT = 0x80000000
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} what;
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__u32 cpu;
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union { /* must be last field of proc_event struct */
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struct {
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__u32 err;
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} ack;
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struct fork_proc_event {
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pid_t parent_pid;
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pid_t parent_tgid;
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pid_t child_pid;
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pid_t child_tgid;
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} fork;
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struct exec_proc_event {
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pid_t process_pid;
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pid_t process_tgid;
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} exec;
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struct id_proc_event {
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pid_t process_pid;
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pid_t process_tgid;
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union {
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uid_t ruid; /* current->uid */
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gid_t rgid; /* current->gid */
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} r;
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union {
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uid_t euid;
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gid_t egid;
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} e;
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} id;
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struct exit_proc_event {
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pid_t process_pid;
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pid_t process_tgid;
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__u32 exit_code, exit_signal;
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} exit;
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} event_data;
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};
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#ifdef __KERNEL__
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#ifdef CONFIG_PROC_EVENTS
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void proc_fork_connector(struct task_struct *task);
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void proc_exec_connector(struct task_struct *task);
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void proc_id_connector(struct task_struct *task, int which_id);
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void proc_exit_connector(struct task_struct *task);
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#else
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static inline void proc_fork_connector(struct task_struct *task)
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{}
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static inline void proc_exec_connector(struct task_struct *task)
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{}
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static inline void proc_id_connector(struct task_struct *task,
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int which_id)
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{}
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static inline void proc_exit_connector(struct task_struct *task)
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{}
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#endif /* CONFIG_PROC_EVENTS */
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#endif /* __KERNEL__ */
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#endif /* CN_PROC_H */
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@ -27,6 +27,12 @@
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#define CN_IDX_CONNECTOR 0xffffffff
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#define CN_VAL_CONNECTOR 0xffffffff
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/*
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* Process Events connector unique ids -- used for message routing
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*/
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#define CN_IDX_PROC 0x1
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#define CN_VAL_PROC 0x1
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#define CN_NETLINK_USERS 1
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/*
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@ -28,6 +28,7 @@
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#include <linux/cpuset.h>
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#include <linux/syscalls.h>
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#include <linux/signal.h>
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#include <linux/cn_proc.h>
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#include <asm/uaccess.h>
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#include <asm/unistd.h>
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@ -863,6 +864,7 @@ fastcall NORET_TYPE void do_exit(long code)
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module_put(tsk->binfmt->module);
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tsk->exit_code = code;
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proc_exit_connector(tsk);
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exit_notify(tsk);
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#ifdef CONFIG_NUMA
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mpol_free(tsk->mempolicy);
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@ -42,6 +42,7 @@
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#include <linux/profile.h>
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#include <linux/rmap.h>
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#include <linux/acct.h>
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#include <linux/cn_proc.h>
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#include <asm/pgtable.h>
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#include <asm/pgalloc.h>
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@ -1143,6 +1144,7 @@ static task_t *copy_process(unsigned long clone_flags,
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__get_cpu_var(process_counts)++;
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}
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proc_fork_connector(p);
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if (!current->signal->tty && p->signal->tty)
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p->signal->tty = NULL;
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@ -28,6 +28,7 @@
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#include <linux/suspend.h>
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#include <linux/tty.h>
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#include <linux/signal.h>
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#include <linux/cn_proc.h>
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#include <linux/compat.h>
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#include <linux/syscalls.h>
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@ -623,6 +624,7 @@ asmlinkage long sys_setregid(gid_t rgid, gid_t egid)
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current->egid = new_egid;
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current->gid = new_rgid;
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key_fsgid_changed(current);
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proc_id_connector(current, PROC_EVENT_GID);
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return 0;
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}
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@ -662,6 +664,7 @@ asmlinkage long sys_setgid(gid_t gid)
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return -EPERM;
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key_fsgid_changed(current);
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proc_id_connector(current, PROC_EVENT_GID);
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return 0;
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}
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@ -751,6 +754,7 @@ asmlinkage long sys_setreuid(uid_t ruid, uid_t euid)
|
|||
current->fsuid = current->euid;
|
||||
|
||||
key_fsuid_changed(current);
|
||||
proc_id_connector(current, PROC_EVENT_UID);
|
||||
|
||||
return security_task_post_setuid(old_ruid, old_euid, old_suid, LSM_SETID_RE);
|
||||
}
|
||||
|
|
@ -798,6 +802,7 @@ asmlinkage long sys_setuid(uid_t uid)
|
|||
current->suid = new_suid;
|
||||
|
||||
key_fsuid_changed(current);
|
||||
proc_id_connector(current, PROC_EVENT_UID);
|
||||
|
||||
return security_task_post_setuid(old_ruid, old_euid, old_suid, LSM_SETID_ID);
|
||||
}
|
||||
|
|
@ -846,6 +851,7 @@ asmlinkage long sys_setresuid(uid_t ruid, uid_t euid, uid_t suid)
|
|||
current->suid = suid;
|
||||
|
||||
key_fsuid_changed(current);
|
||||
proc_id_connector(current, PROC_EVENT_UID);
|
||||
|
||||
return security_task_post_setuid(old_ruid, old_euid, old_suid, LSM_SETID_RES);
|
||||
}
|
||||
|
|
@ -898,6 +904,7 @@ asmlinkage long sys_setresgid(gid_t rgid, gid_t egid, gid_t sgid)
|
|||
current->sgid = sgid;
|
||||
|
||||
key_fsgid_changed(current);
|
||||
proc_id_connector(current, PROC_EVENT_GID);
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
|
@ -940,6 +947,7 @@ asmlinkage long sys_setfsuid(uid_t uid)
|
|||
}
|
||||
|
||||
key_fsuid_changed(current);
|
||||
proc_id_connector(current, PROC_EVENT_UID);
|
||||
|
||||
security_task_post_setuid(old_fsuid, (uid_t)-1, (uid_t)-1, LSM_SETID_FS);
|
||||
|
||||
|
|
@ -968,6 +976,7 @@ asmlinkage long sys_setfsgid(gid_t gid)
|
|||
}
|
||||
current->fsgid = gid;
|
||||
key_fsgid_changed(current);
|
||||
proc_id_connector(current, PROC_EVENT_GID);
|
||||
}
|
||||
return old_fsgid;
|
||||
}
|
||||
|
|
|
|||
Reference in New Issue