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 */
89 unsigned long
emul_flags_translate(const struct emul_flags_xtab * tab,unsigned long in,unsigned long * leftover)90 emul_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
106 void
compat_offseterr(struct vnode * vp,const char * msg)107 compat_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 */
124 int
compat_elf_check_interp(struct exec_package * epp,char * interp,const char * interp_suffix)125 compat_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
164 MODULE(MODULE_CLASS_MISC, compat_util, NULL);
165
166 int
compat_util_modcmd(modcmd_t cmd,void * arg)167 compat_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