NetBSD/sys/compat/freebsd/freebsd_exec_elf32.c

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/* $NetBSD: freebsd_exec_elf32.c,v 1.6 2001/11/13 02:08:07 lukem Exp $ */
/*
* Copyright (c) 1993, 1994 Christopher G. Demetriou
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Christopher G. Demetriou.
* 4. 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 <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: freebsd_exec_elf32.c,v 1.6 2001/11/13 02:08:07 lukem Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/malloc.h>
#include <sys/vnode.h>
#include <sys/exec.h>
#ifndef ELFSIZE
# define ELFSIZE 32
#endif /* !ELFSIZE */
#include <sys/exec_elf.h>
#include <machine/freebsd_machdep.h>
#include <compat/freebsd/freebsd_exec.h>
#include <compat/common/compat_util.h>
int
ELFNAME2(freebsd,probe)(p, epp, veh, itp, pos)
struct proc *p;
struct exec_package *epp;
void *veh;
char *itp;
vaddr_t *pos;
{
int error;
size_t i;
size_t phsize;
Elf_Ehdr *eh = (Elf_Ehdr *) veh;
Elf_Phdr *ph;
Elf_Phdr *ephp;
Elf_Nhdr *np;
const char *bp;
static const char wantBrand[] = FREEBSD_ELF_BRAND_STRING;
static const char wantInterp[] = FREEBSD_ELF_INTERP_PREFIX_STRING;
/*
* Insist that the executable have a brand, and that it be "FreeBSD".
* Newer FreeBSD binaries have OSABI set to ELFOSABI_FREEBSD. This
* is arguably broken, but they seem to think they need it, for
* whatever reason.
*/
#ifndef EI_BRAND
#define EI_BRAND 8
#endif
if ((eh->e_ident[EI_BRAND] == '\0'
|| strcmp(&eh->e_ident[EI_BRAND], wantBrand) != 0)
&& eh->e_ident[EI_OSABI] != ELFOSABI_FREEBSD)
return ENOEXEC;
i = eh->e_phnum;
if (i != 0) {
phsize = i * sizeof(Elf_Phdr);
ph = (Elf_Phdr *) malloc(phsize, M_TEMP, M_WAITOK);
if ((error = exec_read_from(p, epp->ep_vp, eh->e_phoff, ph,
phsize)) != 0)
goto bad1;
for (ephp = ph; i--; ephp++) {
if (ephp->p_type != PT_INTERP)
continue;
/* Check for "legal" intepreter name. */
if (ephp->p_filesz < sizeof wantInterp)
goto bad1;
np = (Elf_Nhdr *) malloc(ephp->p_filesz+1,
M_TEMP, M_WAITOK);
if (((error = exec_read_from(p, epp->ep_vp,
ephp->p_offset, np, ephp->p_filesz)) != 0))
goto bad2;
if (strncmp((char *)np, wantInterp,
sizeof wantInterp - 1))
goto bad2;
free(np, M_TEMP);
break;
}
free(ph, M_TEMP);
}
if (itp[0]) {
if ((error = emul_find(p, NULL, epp->ep_esch->es_emul->e_path,
itp, &bp, 0)))
return error;
if ((error = copystr(bp, itp, MAXPATHLEN, &i)) != 0)
return error;
free((void *)bp, M_TEMP);
}
*pos = ELF_NO_ADDR;
#ifdef DEBUG_FREEBSD_ELF
printf("freebsd_elf32_probe: returning 0\n");
#endif
return 0;
bad2:
free(np, M_TEMP);
bad1:
free(ph, M_TEMP);
return ENOEXEC;
}