1/* 	$NetBSD: compat_util.c,v 1.47 2019/01/27 02:08:39 pgoyette Exp $	*/
2
3/*-
4 * Copyright (c) 1994 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Christos Zoulas and Frank van der Linden.
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/*
33 * Copyright (c) 2008, 2009 Matthew R. Green
34 * All rights reserved.
35 *
36 * Redistribution and use in source and binary forms, with or without
37 * modification, are permitted provided that the following conditions
38 * are met:
39 * 1. Redistributions of source code must retain the above copyright
40 *    notice, this list of conditions and the following disclaimer.
41 * 2. Redistributions in binary form must reproduce the above copyright
42 *    notice, this list of conditions and the following disclaimer in the
43 *    documentation and/or other materials provided with the distribution.
44 * 3. The name of the author may not be used to endorse or promote products
45 *    derived from this software without specific prior written permission.
46 *
47 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
48 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
49 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
50 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
51 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
52 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
53 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
54 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
55 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
56 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
57 * SUCH DAMAGE.
58 */
59
60#include <sys/cdefs.h>
61__KERNEL_RCSID(0, "$NetBSD: compat_util.c,v 1.47 2019/01/27 02:08:39 pgoyette Exp $");
62
63#if defined(_KERNEL_OPT)
64#include "opt_compat_netbsd.h"
65#endif
66
67#include <sys/param.h>
68#include <sys/systm.h>
69#include <sys/namei.h>
70#include <sys/proc.h>
71#include <sys/file.h>
72#include <sys/stat.h>
73#include <sys/filedesc.h>
74#include <sys/exec.h>
75#include <sys/ioctl.h>
76#include <sys/kernel.h>
77#include <sys/vnode.h>
78#include <sys/syslog.h>
79#include <sys/mount.h>
80#include <sys/module.h>
81
82#include <compat/common/compat_util.h>
83
84/*
85 * Translate one set of flags to another, based on the entries in
86 * the given table.  If 'leftover' is specified, it is filled in
87 * with any flags which could not be translated.
88 */
89unsigned long
90emul_flags_translate(const struct emul_flags_xtab *tab,
91		     unsigned long in, unsigned long *leftover)
92{
93	unsigned long out;
94
95	for (out = 0; tab->omask != 0; tab++) {
96		if ((in & tab->omask) == tab->oval) {
97			in &= ~tab->omask;
98			out |= tab->nval;
99		}
100	}
101	if (leftover != NULL)
102		*leftover = in;
103	return (out);
104}
105
106void
107compat_offseterr(struct vnode *vp, const char *msg)
108{
109	struct mount *mp;
110
111	mp = vp->v_mount;
112
113	log(LOG_ERR, "%s: dir offset too large on fs %s (mounted from %s)\n",
114	    msg, mp->mnt_stat.f_mntonname, mp->mnt_stat.f_mntfromname);
115	uprintf("%s: dir offset too large for emulated program\n", msg);
116}
117
118/*
119 * Look for native NetBSD compatibility libraries, usually interp-ABI.
120 * It returns 0 if it changed the interpreter, otherwise it returns
121 * the error from namei().  Callers should not try any more processing
122 * if this returns 0, and probably should just ignore the return value.
123 */
124int
125compat_elf_check_interp(struct exec_package *epp,
126			char *interp,
127			const char *interp_suffix)
128{
129	int error = 0;
130
131	/*
132	 * Don't look for something else, if someone has already found and
133	 * setup the ep_interp already.
134	 */
135	if (interp && epp->ep_interp == NULL) {
136		/*
137		 * If the path is exactly "/usr/libexec/ld.elf_so", first
138		 * try to see if "/usr/libexec/ld.elf_so-<abi>" exists
139		 * and if so, use that instead.
140		 */
141		if (strcmp(interp, "/usr/libexec/ld.elf_so") == 0 ||
142		    strcmp(interp, "/libexec/ld.elf_so") == 0) {
143			struct vnode *vp;
144			char *path;
145
146			path = PNBUF_GET();
147			snprintf(path, MAXPATHLEN, "%s-%s", interp, interp_suffix);
148			error = namei_simple_kernel(path,
149					NSM_FOLLOW_NOEMULROOT, &vp);
150			/*
151			 * If that worked, replace interpreter in case we
152			 * actually need to load it.
153			 */
154			if (error == 0) {
155				epp->ep_interp = vp;
156				snprintf(interp, MAXPATHLEN, "%s", path);
157			}
158			PNBUF_PUT(path);
159		}
160	}
161	return error;
162}
163
164MODULE(MODULE_CLASS_MISC, compat_util, NULL);
165
166int
167compat_util_modcmd(modcmd_t cmd, void *arg)
168{
169
170	switch (cmd) {
171	case MODULE_CMD_INIT:
172	case MODULE_CMD_FINI:
173		return 0;
174	default:
175		return ENOTTY;
176	}
177}
178