compat_util.c revision 1.46.18.1
1 /* $NetBSD: compat_util.c,v 1.46.18.1 2018/03/06 10:37:41 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 1.46.18.1 2018/03/06 10:37:41 pgoyette Exp $"); 62 63 #include <sys/param.h> 64 #include <sys/systm.h> 65 #include <sys/namei.h> 66 #include <sys/proc.h> 67 #include <sys/file.h> 68 #include <sys/stat.h> 69 #include <sys/filedesc.h> 70 #include <sys/exec.h> 71 #include <sys/ioctl.h> 72 #include <sys/kernel.h> 73 #include <sys/vnode.h> 74 #include <sys/syslog.h> 75 #include <sys/mount.h> 76 77 #include <compat/common/compat_util.h> 78 79 /* 80 * Translate one set of flags to another, based on the entries in 81 * the given table. If 'leftover' is specified, it is filled in 82 * with any flags which could not be translated. 83 */ 84 unsigned long 85 emul_flags_translate(const struct emul_flags_xtab *tab, 86 unsigned long in, unsigned long *leftover) 87 { 88 unsigned long out; 89 90 for (out = 0; tab->omask != 0; tab++) { 91 if ((in & tab->omask) == tab->oval) { 92 in &= ~tab->omask; 93 out |= tab->nval; 94 } 95 } 96 if (leftover != NULL) 97 *leftover = in; 98 return (out); 99 } 100 101 void 102 compat_offseterr(struct vnode *vp, const char *msg) 103 { 104 struct mount *mp; 105 106 mp = vp->v_mount; 107 108 log(LOG_ERR, "%s: dir offset too large on fs %s (mounted from %s)\n", 109 msg, mp->mnt_stat.f_mntonname, mp->mnt_stat.f_mntfromname); 110 uprintf("%s: dir offset too large for emulated program\n", msg); 111 } 112 113 /* 114 * Look for native NetBSD compatibility libraries, usually interp-ABI. 115 * It returns 0 if it changed the interpreter, otherwise it returns 116 * the error from namei(). Callers should not try any more processing 117 * if this returns 0, and probably should just ignore the return value. 118 */ 119 int 120 compat_elf_check_interp(struct exec_package *epp, 121 char *interp, 122 const char *interp_suffix) 123 { 124 int error = 0; 125 126 /* 127 * Don't look for something else, if someone has already found and 128 * setup the ep_interp already. 129 */ 130 if (interp && epp->ep_interp == NULL) { 131 /* 132 * If the path is exactly "/usr/libexec/ld.elf_so", first 133 * try to see if "/usr/libexec/ld.elf_so-<abi>" exists 134 * and if so, use that instead. 135 */ 136 if (strcmp(interp, "/usr/libexec/ld.elf_so") == 0 || 137 strcmp(interp, "/libexec/ld.elf_so") == 0) { 138 struct vnode *vp; 139 char *path; 140 141 path = PNBUF_GET(); 142 snprintf(path, MAXPATHLEN, "%s-%s", interp, interp_suffix); 143 error = namei_simple_kernel(path, 144 NSM_FOLLOW_NOEMULROOT, &vp); 145 /* 146 * If that worked, replace interpreter in case we 147 * actually need to load it. 148 */ 149 if (error == 0) { 150 epp->ep_interp = vp; 151 snprintf(interp, MAXPATHLEN, "%s", path); 152 } 153 PNBUF_PUT(path); 154 } 155 } 156 return error; 157 } 158
Indexes created Fri Oct 03 02:09:57 GMT 2025