t_proc2.c revision 313498 
1/* $NetBSD: t_proc2.c,v 1.2 2015/01/14 22:22:32 christos Exp $ */
2
3/*-
4 * Copyright (c) 2008 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Peter Werner <Peter.Werner@wgsn.com>.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33__COPYRIGHT("@(#) Copyright (c) 2008\
34 The NetBSD Foundation, inc. All rights reserved.");
35__RCSID("$NetBSD: t_proc2.c,v 1.2 2015/01/14 22:22:32 christos Exp $");
36
37#include <sys/event.h>
38#include <sys/time.h>
39#include <sys/types.h>
40#include <sys/wait.h>
41
42#include <err.h>
43#include <pwd.h>
44#include <stdio.h>
45#include <stdlib.h>
46#include <unistd.h>
47
48#include <atf-c.h>
49
50#include "../../h_macros.h"
51
52static void
53child_two(void)
54{
55	_exit(EXIT_SUCCESS);
56}
57
58static void
59child_one(void)
60{
61	pid_t pid;
62	struct passwd *pwd;
63	const char *nam = "nobody";
64
65	pwd = getpwnam(nam);
66	if (pwd == NULL)
67		err(EXIT_FAILURE, "getpwnam(\"%s\")", nam);
68
69	if ((setuid(pwd->pw_uid)) == -1)
70		err(EXIT_FAILURE, "setuid(%d)", pwd->pw_uid);
71
72	pid = fork();
73	if (pid == -1)
74		err(EXIT_FAILURE, "fork()");
75
76	if (pid == 0)
77		child_two();
78
79	_exit(EXIT_SUCCESS);
80}
81
82ATF_TC(proc2);
83ATF_TC_HEAD(proc2, tc)
84{
85	atf_tc_set_md_var(tc, "require.user", "root");
86	atf_tc_set_md_var(tc, "descr",
87	    "Checks EVFILT_PROC for NOTE_FORK|NOTE_TRACK error path problem "
88	    "fixed in rev. 1.1.1.1.2.17 of sys/kern/kern_event.c");
89}
90ATF_TC_BODY(proc2, tc)
91{
92	pid_t pid = 0;
93	int kq, status;
94	struct kevent ke;
95	struct timespec timeout;
96
97	RL(kq = kqueue());
98
99	timeout.tv_sec = 0;
100	timeout.tv_nsec = 0;
101
102	RL(pid = fork());
103	if (pid == 0) {
104		(void)sleep(1); /* let parent set kevent */
105		child_one();
106		/* NOTREACHED */
107	}
108
109	EV_SET(&ke, (uintptr_t)pid, EVFILT_PROC, EV_ADD, NOTE_FORK|NOTE_TRACK,
110	    0, 0);
111
112	RL(kevent(kq, &ke, 1, NULL, 0, &timeout));
113
114	(void)sleep(2);
115
116	ke.ident = 0;
117	ke.fflags = 0;
118	ke.flags = EV_ENABLE;
119
120	RL(kevent(kq, NULL, 0, &ke, 1, &timeout));
121	RL(close(kq));
122
123	RL(waitpid(pid, &status, 0));
124	ATF_REQUIRE(WIFEXITED(status));
125	ATF_REQUIRE_EQ(WEXITSTATUS(status), EXIT_SUCCESS);
126
127	/*
128	 * we are expecting an error here as we should not have
129	 * been able to add a knote to child 2.
130	 */
131	ATF_REQUIRE(ke.fflags & NOTE_TRACKERR);
132}
133
134ATF_TP_ADD_TCS(tp)
135{
136	ATF_TP_ADD_TC(tp, proc2);
137
138	return atf_no_error();
139}
140