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      1 /* $NetBSD: t_proc2.c,v 1.3 2017/01/13 21:30:41 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 (at) 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 1.3 2017/01/13 21:30:41 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 
     52 static void
     53 child_two(void)
     54 {
     55 	_exit(EXIT_SUCCESS);
     56 }
     57 
     58 static void
     59 child_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 
     82 ATF_TC(proc2);
     83 ATF_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 }
     90 ATF_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 
    134 ATF_TP_ADD_TCS(tp)
    135 {
    136 	ATF_TP_ADD_TC(tp, proc2);
    137 
    138 	return atf_no_error();
    139 }
    140