t_nullpts.c revision 1.1 
1/*	$NetBSD: t_nullpts.c,v 1.1 2010/06/11 23:52:38 pooka Exp $	*/
2
3#include <sys/types.h>
4#include <sys/mount.h>
5#include <sys/ioctl.h>
6
7#include <atf-c.h>
8#include <err.h>
9#include <errno.h>
10#include <fcntl.h>
11#include <stdio.h>
12#include <unistd.h>
13#include <string.h>
14#include <stdlib.h>
15
16#include <rump/rump.h>
17#include <rump/rump_syscalls.h>
18
19#include <fs/ptyfs/ptyfs.h>
20#include <miscfs/nullfs/null.h>
21
22#include "../../h_macros.h"
23
24static void
25mountptyfs(const char *mp, int flags)
26{
27	struct ptyfs_args args;
28
29	if (rump_sys_mkdir(mp, 0777) == -1) {
30		if (errno != EEXIST)
31			atf_tc_fail_errno("null create %s", mp);
32	}
33	memset(&args, 0, sizeof(args));
34	args.version = PTYFS_ARGSVERSION;
35	args.mode = 0777;
36	if (rump_sys_mount(MOUNT_PTYFS, mp, flags, &args, sizeof(args)) == -1)
37		atf_tc_fail_errno("could not mount ptyfs");
38}
39
40static void
41mountnull(const char *what, const char *mp, int flags)
42{
43	struct null_args nargs;
44
45	if (rump_sys_mkdir(what, 0777) == -1) {
46		if (errno != EEXIST)
47			atf_tc_fail_errno("null create %s", what);
48	}
49	if (rump_sys_mkdir(mp, 0777) == -1) {
50		if (errno != EEXIST)
51			atf_tc_fail_errno("null create %s", mp);
52	}
53	memset(&nargs, 0, sizeof(nargs));
54	nargs.nulla_target = __UNCONST(what);
55	if (rump_sys_mount(MOUNT_NULL, mp, flags, &nargs, sizeof(nargs)) == -1)
56		atf_tc_fail_errno("could not mount nullfs");
57}
58
59ATF_TC(nullrevoke);
60ATF_TC_HEAD(nullrevoke, tc)
61{
62	atf_tc_set_md_var(tc, "descr", "null mount ptyfs and revoke "
63	    "(PR kern/43456)");
64}
65
66ATF_TC_BODY(nullrevoke, tc)
67{
68	char path[MAXPATHLEN];
69	struct ptmget ptg;
70	int ptm;
71
72	rump_init();
73
74	/*
75	 * mount /dev/pts
76	 */
77	mountptyfs("/dev/pts", 0);
78
79	/*
80	 * null mount /dev to /null/dev
81	 */
82	if (rump_sys_mkdir("/null", 0777) == -1) {
83		if (errno != EEXIST)
84			atf_tc_fail_errno("null create /null");
85	}
86	mountnull("/dev", "/null/dev", 0);
87
88	/*
89	 * get slave/master pair.
90	 */
91	ptm = rump_sys_open("/dev/ptm", O_RDWR);
92	if (rump_sys_ioctl(ptm, TIOCPTMGET, &ptg) == -1)
93		atf_tc_fail_errno("get pty");
94
95	/*
96	 * Build nullfs path to slave.
97	 */
98	strcpy(path, "/null/");
99	strcat(path, ptg.sn);
100
101	/*
102	 * Open slave tty via nullfs.
103	 */
104	if (rump_sys_open(path, O_RDWR) == -1)
105		atf_tc_fail_errno("slave null open");
106
107	/*
108	 * Close slave opened with /dev/ptm.  Need purely non-null refs to it.
109	 */
110	rump_sys_close(ptg.sfd);
111
112	/* revoke slave tty.  boom */
113	rump_sys_revoke(path);
114
115	/* done? */
116}
117
118ATF_TP_ADD_TCS(tp)
119{
120
121	ATF_TP_ADD_TC(tp, nullrevoke);
122
123	return atf_no_error();
124}
125