147 lines
5.0 KiB
C
147 lines
5.0 KiB
C
/* $NetBSD: subr_emul.c,v 1.2 2019/01/27 02:08:43 pgoyette Exp $ */
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/*-
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* Copyright (c) 1994, 2000, 2005, 2015 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Christos Zoulas and Maxime Villard.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Copyright (c) 1996 Christopher G. Demetriou
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(1, "$NetBSD: subr_emul.c,v 1.2 2019/01/27 02:08:43 pgoyette Exp $");
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#ifdef _KERNEL_OPT
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#include "opt_pax.h"
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#endif /* _KERNEL_OPT */
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#include <sys/param.h>
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#include <sys/proc.h>
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#include <sys/vnode.h>
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#include <sys/namei.h>
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#include <sys/exec.h>
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#include <compat/common/compat_util.h>
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void
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emul_find_root(struct lwp *l, struct exec_package *epp)
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{
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struct vnode *vp;
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const char *emul_path;
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if (epp->ep_emul_root != NULL)
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/* We've already found it */
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return;
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emul_path = epp->ep_esch->es_emul->e_path;
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if (emul_path == NULL)
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/* Emulation doesn't have a root */
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return;
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if (namei_simple_kernel(emul_path, NSM_FOLLOW_NOEMULROOT, &vp) != 0)
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/* emulation root doesn't exist */
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return;
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epp->ep_emul_root = vp;
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}
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/*
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* Search the alternate path for dynamic binary interpreter. If not found
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* there, check if the interpreter exists in within 'proper' tree.
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*/
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int
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emul_find_interp(struct lwp *l, struct exec_package *epp, const char *itp)
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{
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int error;
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struct pathbuf *pb;
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struct nameidata nd;
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unsigned int flags;
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pb = pathbuf_create(itp);
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if (pb == NULL) {
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return ENOMEM;
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}
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/* If we haven't found the emulation root already, do so now */
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/* Maybe we should remember failures somehow ? */
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if (epp->ep_esch->es_emul->e_path != 0 && epp->ep_emul_root == NULL)
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emul_find_root(l, epp);
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if (epp->ep_interp != NULL)
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vrele(epp->ep_interp);
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/* We need to use the emulation root for the new program,
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* not the one for the current process. */
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if (epp->ep_emul_root == NULL)
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flags = FOLLOW;
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else {
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nd.ni_erootdir = epp->ep_emul_root;
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/* hack: Pass in the emulation path for ktrace calls */
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nd.ni_next = epp->ep_esch->es_emul->e_path;
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flags = FOLLOW | TRYEMULROOT | EMULROOTSET;
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}
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NDINIT(&nd, LOOKUP, flags, pb);
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error = namei(&nd);
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if (error != 0) {
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epp->ep_interp = NULL;
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pathbuf_destroy(pb);
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return error;
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}
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/* Save interpreter in case we actually need to load it */
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epp->ep_interp = nd.ni_vp;
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pathbuf_destroy(pb);
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return 0;
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}
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