ioctls_test.c revision 367457 
1/*-
2 * Copyright (c) 2018 John Baldwin <jhb@FreeBSD.org>
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23 * SUCH DAMAGE.
24 */
25
26#include <sys/cdefs.h>
27__FBSDID("$FreeBSD: stable/11/tests/sys/capsicum/ioctls_test.c 367457 2020-11-07 18:10:59Z dim $");
28
29#include <sys/capsicum.h>
30#include <sys/filio.h>
31#include <sys/socket.h>
32#include <sys/wait.h>
33#include <netinet/in.h>
34#include <stdio.h>
35#include <stdlib.h>
36#include <unistd.h>
37
38#include <atf-c.h>
39
40/*
41 * A variant of ATF_REQUIRE that is suitable for use in child
42 * processes.  This only works if the parent process is tripped up by
43 * the early exit and fails some requirement itself.
44 */
45#define	CHILD_REQUIRE(exp) do {						\
46		if (!(exp))						\
47			child_fail_require(__FILE__, __LINE__,		\
48			    #exp " not met");				\
49	} while (0)
50
51static __dead2 void
52child_fail_require(const char *file, int line, const char *str)
53{
54	char buf[128];
55
56	snprintf(buf, sizeof(buf), "%s:%d: %s\n", file, line, str);
57	write(2, buf, strlen(buf));
58	_exit(32);
59}
60
61/*
62 * Exercise the edge case of a custom ioctl list being copied from a
63 * listen socket to an accepted socket.
64 */
65ATF_TC_WITHOUT_HEAD(cap_ioctls__listen_copy);
66ATF_TC_BODY(cap_ioctls__listen_copy, tc)
67{
68	struct sockaddr_in sin;
69	cap_rights_t rights;
70	u_long cmds[] = { FIONREAD };
71	socklen_t len;
72	pid_t pid;
73	char dummy;
74	int s[2], status;
75
76	s[0] = socket(AF_INET, SOCK_STREAM, 0);
77	ATF_REQUIRE(s[0] > 0);
78
79	/* Bind to an arbitrary unused port. */
80	memset(&sin, 0, sizeof(sin));
81	sin.sin_len = sizeof(sin);
82	sin.sin_family = AF_INET;
83	sin.sin_port = 0;
84	sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
85	ATF_REQUIRE(bind(s[0], (struct sockaddr *)&sin, sizeof(sin)) == 0);
86
87	CHILD_REQUIRE(listen(s[0], 1) == 0);
88
89	len = sizeof(sin);
90	ATF_REQUIRE(getsockname(s[0], (struct sockaddr *)&sin, &len) == 0);
91	ATF_REQUIRE(len == sizeof(sin));
92
93	cap_rights_init(&rights, CAP_ACCEPT, CAP_IOCTL);
94	ATF_REQUIRE(cap_rights_limit(s[0], &rights) == 0);
95	ATF_REQUIRE(cap_ioctls_limit(s[0], cmds, nitems(cmds)) == 0);
96
97	pid = fork();
98	if (pid == 0) {
99		s[1] = accept(s[0], NULL, NULL);
100		CHILD_REQUIRE(s[1] > 0);
101
102		/* Close both sockets during exit(). */
103		exit(0);
104	}
105
106	ATF_REQUIRE(pid > 0);
107
108	ATF_REQUIRE(close(s[0]) == 0);
109	s[1] = socket(AF_INET, SOCK_STREAM, 0);
110	ATF_REQUIRE(s[1] > 0);
111	ATF_REQUIRE(connect(s[1], (struct sockaddr *)&sin, sizeof(sin)) == 0);
112	ATF_REQUIRE(read(s[1], &dummy, sizeof(dummy)) == 0);
113	ATF_REQUIRE(close(s[1]) == 0);
114
115	ATF_REQUIRE(wait(&status) == pid);
116	ATF_REQUIRE(WIFEXITED(status));
117	ATF_REQUIRE(WEXITSTATUS(status) == 0);
118}
119
120ATF_TP_ADD_TCS(tp)
121{
122
123	ATF_TP_ADD_TC(tp, cap_ioctls__listen_copy);
124
125	return (atf_no_error());
126}
127