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The current proc connector code has the foll. bugs - if there are more than one listeners for the proc connector messages, and one of them deregisters for listening using PROC_CN_MCAST_IGNORE, they will still get all proc connector messages, as long as there is another listener. Another issue is if one client calls PROC_CN_MCAST_LISTEN, and another one calls PROC_CN_MCAST_IGNORE, then both will end up not getting any messages. This patch adds filtering and drops packet if client has sent PROC_CN_MCAST_IGNORE. This data is stored in the client socket's sk_user_data. In addition, we only increment or decrement proc_event_num_listeners once per client. This fixes the above issues. cn_release is the release function added for NETLINK_CONNECTOR. It uses the newly added netlink_release function added to netlink_sock. It will free sk_user_data. Signed-off-by: Anjali Kulkarni <anjali.k.kulkarni@oracle.com> Reviewed-by: Liam R. Howlett <Liam.Howlett@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
142 lines
3.5 KiB
C
142 lines
3.5 KiB
C
/* SPDX-License-Identifier: LGPL-2.1 WITH Linux-syscall-note */
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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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* 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 it
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* under the terms of version 2.1 of the GNU Lesser General Public License
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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*/
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#ifndef _UAPICN_PROC_H
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#define _UAPICN_PROC_H
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#include <linux/types.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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enum proc_cn_event {
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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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PROC_EVENT_SID = 0x00000080,
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PROC_EVENT_PTRACE = 0x00000100,
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PROC_EVENT_COMM = 0x00000200,
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/* "next" should be 0x00000400 */
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/* "last" is the last process event: exit,
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* while "next to last" is coredumping event
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*/
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PROC_EVENT_COREDUMP = 0x40000000,
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PROC_EVENT_EXIT = 0x80000000
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};
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struct proc_input {
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enum proc_cn_mcast_op mcast_op;
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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 proc_cn_event what;
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__u32 cpu;
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__u64 __attribute__((aligned(8))) timestamp_ns;
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/* Number of nano seconds since system boot */
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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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__kernel_pid_t parent_pid;
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__kernel_pid_t parent_tgid;
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__kernel_pid_t child_pid;
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__kernel_pid_t child_tgid;
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} fork;
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struct exec_proc_event {
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__kernel_pid_t process_pid;
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__kernel_pid_t process_tgid;
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} exec;
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struct id_proc_event {
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__kernel_pid_t process_pid;
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__kernel_pid_t process_tgid;
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union {
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__u32 ruid; /* task uid */
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__u32 rgid; /* task gid */
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} r;
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union {
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__u32 euid;
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__u32 egid;
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} e;
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} id;
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struct sid_proc_event {
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__kernel_pid_t process_pid;
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__kernel_pid_t process_tgid;
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} sid;
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struct ptrace_proc_event {
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__kernel_pid_t process_pid;
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__kernel_pid_t process_tgid;
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__kernel_pid_t tracer_pid;
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__kernel_pid_t tracer_tgid;
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} ptrace;
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struct comm_proc_event {
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__kernel_pid_t process_pid;
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__kernel_pid_t process_tgid;
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char comm[16];
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} comm;
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struct coredump_proc_event {
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__kernel_pid_t process_pid;
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__kernel_pid_t process_tgid;
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__kernel_pid_t parent_pid;
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__kernel_pid_t parent_tgid;
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} coredump;
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struct exit_proc_event {
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__kernel_pid_t process_pid;
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__kernel_pid_t process_tgid;
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__u32 exit_code, exit_signal;
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__kernel_pid_t parent_pid;
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__kernel_pid_t parent_tgid;
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} exit;
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} event_data;
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};
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#endif /* _UAPICN_PROC_H */
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