47cd9b85d6
it checks both the alternative/emul tree, and the non-emul tree. This makes it possible to run chrooted emulated binaries without need to setup shadow /emul tree within the chroot hierarchy. Only tested for COMPAT_LINUX, changes to other compat modules were mechanical. Fixes kern/19161 by Christian Groessler.
135 lines
4.0 KiB
C
135 lines
4.0 KiB
C
/* $NetBSD: freebsd_exec_elf32.c,v 1.9 2002/11/29 19:13:14 jdolecek Exp $ */
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/*
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* Copyright (c) 1993, 1994 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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Christopher G. Demetriou.
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* 4. 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(0, "$NetBSD: freebsd_exec_elf32.c,v 1.9 2002/11/29 19:13:14 jdolecek Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/malloc.h>
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#include <sys/vnode.h>
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#include <sys/exec.h>
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#ifndef ELFSIZE
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# define ELFSIZE 32
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#endif /* !ELFSIZE */
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#include <sys/exec_elf.h>
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#include <machine/freebsd_machdep.h>
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#include <compat/freebsd/freebsd_exec.h>
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#include <compat/common/compat_util.h>
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int
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ELFNAME2(freebsd,probe)(p, epp, veh, itp, pos)
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struct proc *p;
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struct exec_package *epp;
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void *veh;
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char *itp;
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vaddr_t *pos;
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{
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int error;
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size_t i;
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size_t phsize;
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Elf_Ehdr *eh = (Elf_Ehdr *) veh;
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Elf_Phdr *ph;
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Elf_Phdr *ephp;
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Elf_Nhdr *np;
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static const char wantBrand[] = FREEBSD_ELF_BRAND_STRING;
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static const char wantInterp[] = FREEBSD_ELF_INTERP_PREFIX_STRING;
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/*
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* Insist that the executable have a brand, and that it be "FreeBSD".
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* Newer FreeBSD binaries have OSABI set to ELFOSABI_FREEBSD. This
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* is arguably broken, but they seem to think they need it, for
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* whatever reason.
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*/
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#ifndef EI_BRAND
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#define EI_BRAND 8
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#endif
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if ((eh->e_ident[EI_BRAND] == '\0'
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|| strcmp(&eh->e_ident[EI_BRAND], wantBrand) != 0)
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&& eh->e_ident[EI_OSABI] != ELFOSABI_FREEBSD)
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return ENOEXEC;
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i = eh->e_phnum;
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if (i != 0) {
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phsize = i * sizeof(Elf_Phdr);
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ph = (Elf_Phdr *) malloc(phsize, M_TEMP, M_WAITOK);
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if ((error = exec_read_from(p, epp->ep_vp, eh->e_phoff, ph,
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phsize)) != 0)
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goto bad1;
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for (ephp = ph; i--; ephp++) {
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if (ephp->p_type != PT_INTERP)
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continue;
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/* Check for "legal" intepreter name. */
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if (ephp->p_filesz < sizeof wantInterp)
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goto bad1;
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np = (Elf_Nhdr *) malloc(ephp->p_filesz+1,
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M_TEMP, M_WAITOK);
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if (((error = exec_read_from(p, epp->ep_vp,
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ephp->p_offset, np, ephp->p_filesz)) != 0))
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goto bad2;
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if (strncmp((char *)np, wantInterp,
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sizeof wantInterp - 1))
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goto bad2;
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free(np, M_TEMP);
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break;
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}
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free(ph, M_TEMP);
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}
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if (itp[0]) {
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if ((error = emul_find_interp(p, epp->ep_esch->es_emul->e_path,
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itp)))
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return error;
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}
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*pos = ELF_NO_ADDR;
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#ifdef DEBUG_FREEBSD_ELF
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printf("freebsd_elf32_probe: returning 0\n");
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#endif
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return 0;
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bad2:
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free(np, M_TEMP);
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bad1:
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free(ph, M_TEMP);
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return ENOEXEC;
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}
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