/* $NetBSD: compat_util.c,v 1.45.4.1 2015/01/17 12:10:54 martin Exp $ */ /*- * Copyright (c) 1994 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Christos Zoulas and Frank van der Linden. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ /* * Copyright (c) 2008, 2009 Matthew R. Green * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include __KERNEL_RCSID(0, "$NetBSD: compat_util.c,v 1.45.4.1 2015/01/17 12:10:54 martin Exp $"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include void emul_find_root(struct lwp *l, struct exec_package *epp) { struct vnode *vp; const char *emul_path; if (epp->ep_emul_root != NULL) /* We've already found it */ return; emul_path = epp->ep_esch->es_emul->e_path; if (emul_path == NULL) /* Emulation doesn't have a root */ return; if (namei_simple_kernel(emul_path, NSM_FOLLOW_NOEMULROOT, &vp) != 0) /* emulation root doesn't exist */ return; epp->ep_emul_root = vp; } /* * Search the alternate path for dynamic binary interpreter. If not found * there, check if the interpreter exists in within 'proper' tree. */ int emul_find_interp(struct lwp *l, struct exec_package *epp, const char *itp) { int error; struct pathbuf *pb; struct nameidata nd; unsigned int flags; pb = pathbuf_create(itp); if (pb == NULL) { return ENOMEM; } /* If we haven't found the emulation root already, do so now */ /* Maybe we should remember failures somehow ? */ if (epp->ep_esch->es_emul->e_path != 0 && epp->ep_emul_root == NULL) emul_find_root(l, epp); if (epp->ep_interp != NULL) vrele(epp->ep_interp); /* We need to use the emulation root for the new program, * not the one for the current process. */ if (epp->ep_emul_root == NULL) flags = FOLLOW; else { nd.ni_erootdir = epp->ep_emul_root; /* hack: Pass in the emulation path for ktrace calls */ nd.ni_next = epp->ep_esch->es_emul->e_path; flags = FOLLOW | TRYEMULROOT | EMULROOTSET; } NDINIT(&nd, LOOKUP, flags, pb); error = namei(&nd); if (error != 0) { epp->ep_interp = NULL; pathbuf_destroy(pb); return error; } /* Save interpreter in case we actually need to load it */ epp->ep_interp = nd.ni_vp; pathbuf_destroy(pb); return 0; } /* * Translate one set of flags to another, based on the entries in * the given table. If 'leftover' is specified, it is filled in * with any flags which could not be translated. */ unsigned long emul_flags_translate(const struct emul_flags_xtab *tab, unsigned long in, unsigned long *leftover) { unsigned long out; for (out = 0; tab->omask != 0; tab++) { if ((in & tab->omask) == tab->oval) { in &= ~tab->omask; out |= tab->nval; } } if (leftover != NULL) *leftover = in; return (out); } void compat_offseterr(struct vnode *vp, const char *msg) { struct mount *mp; mp = vp->v_mount; log(LOG_ERR, "%s: dir offset too large on fs %s (mounted from %s)\n", msg, mp->mnt_stat.f_mntonname, mp->mnt_stat.f_mntfromname); uprintf("%s: dir offset too large for emulated program\n", msg); } /* * Look for native NetBSD compatibility libraries, usually interp-ABI. * It returns 0 if it changed the interpreter, otherwise it returns * the error from namei(). Callers should not try any more processing * if this returns 0, and probably should just ignore the return value. */ int compat_elf_check_interp(struct exec_package *epp, char *interp, const char *interp_suffix) { int error = 0; /* * Don't look for something else, if someone has already found and * setup the ep_interp already. */ if (interp && epp->ep_interp == NULL) { /* * If the path is exactly "/usr/libexec/ld.elf_so", first * try to see if "/usr/libexec/ld.elf_so-" exists * and if so, use that instead. */ if (strcmp(interp, "/usr/libexec/ld.elf_so") == 0 || strcmp(interp, "/libexec/ld.elf_so") == 0) { struct vnode *vp; char *path; path = PNBUF_GET(); snprintf(path, MAXPATHLEN, "%s-%s", interp, interp_suffix); error = namei_simple_kernel(path, NSM_FOLLOW_NOEMULROOT, &vp); /* * If that worked, replace interpreter in case we * actually need to load it. */ if (error == 0) { epp->ep_interp = vp; snprintf(interp, MAXPATHLEN, "%s", path); } PNBUF_PUT(path); } } return error; }