137 lines
4.0 KiB
C
137 lines
4.0 KiB
C
/* $NetBSD: freebsd_exec_elf32.c,v 1.17 2007/04/22 08:29:56 dsl 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 1.17 2007/04/22 08:29:56 dsl 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 <compat/sys/signal.h>
|
|
#include <compat/sys/signalvar.h>
|
|
|
|
#include <compat/freebsd/freebsd_exec.h>
|
|
#include <compat/common/compat_util.h>
|
|
|
|
#include <machine/freebsd_machdep.h>
|
|
|
|
|
|
int
|
|
ELFNAME2(freebsd,probe)(
|
|
struct lwp *l,
|
|
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;
|
|
|
|
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(l, 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(l, 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) {
|
|
if ((error = emul_find_interp(l, epp, itp)))
|
|
return error;
|
|
}
|
|
#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;
|
|
}
|