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