342 lines
9.0 KiB
C
342 lines
9.0 KiB
C
/* $NetBSD: linux_exec_elf32.c,v 1.51 2001/01/19 01:43:31 manu Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 1995, 1998, 2000, 2001 The NetBSD Foundation, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to The NetBSD Foundation
|
|
* by Christos Zoulas, Frank van der Linden, Eric Haszlakiewicz and
|
|
* Emmanuel Dreyfus.
|
|
*
|
|
* 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 the NetBSD
|
|
* Foundation, Inc. and its contributors.
|
|
* 4. Neither the name of The NetBSD Foundation nor the names of its
|
|
* contributors may be used to endorse or promote products derived
|
|
* from this software without specific prior written permission.
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
/*
|
|
* based on exec_aout.c, sunos_exec.c and svr4_exec.c
|
|
*/
|
|
|
|
#ifndef ELFSIZE
|
|
#define ELFSIZE 32 /* XXX should die */
|
|
#endif
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/namei.h>
|
|
#include <sys/vnode.h>
|
|
#include <sys/mount.h>
|
|
#include <sys/exec.h>
|
|
#include <sys/exec_elf.h>
|
|
|
|
#include <sys/mman.h>
|
|
#include <sys/syscallargs.h>
|
|
|
|
#include <machine/cpu.h>
|
|
#include <machine/reg.h>
|
|
|
|
#include <compat/linux/common/linux_types.h>
|
|
#include <compat/linux/common/linux_signal.h>
|
|
#include <compat/linux/common/linux_util.h>
|
|
#include <compat/linux/common/linux_exec.h>
|
|
#include <compat/linux/common/linux_machdep.h>
|
|
|
|
#include <compat/linux/linux_syscallargs.h>
|
|
#include <compat/linux/linux_syscall.h>
|
|
|
|
static int ELFNAME2(linux,signature) __P((struct proc *, struct exec_package *,
|
|
Elf_Ehdr *, char *));
|
|
#ifdef LINUX_GCC_SIGNATURE
|
|
static int ELFNAME2(linux,gcc_signature) __P((struct proc *p,
|
|
struct exec_package *, Elf_Ehdr *));
|
|
#endif
|
|
#ifdef LINUX_ATEXIT_SIGNATURE
|
|
static int ELFNAME2(linux,atexit_signature) __P((struct proc *p,
|
|
struct exec_package *, Elf_Ehdr *));
|
|
#endif
|
|
|
|
#ifdef LINUX_ATEXIT_SIGNATURE
|
|
/*
|
|
* On the PowerPC, statically linked Linux binaries are not recognized
|
|
* by linux_signature nor by linux_gcc_signature. Fortunately, thoses
|
|
* binaries features a __libc_atexit ELF section. We therefore assume we
|
|
* have a Linux binary if we find this section.
|
|
*/
|
|
static int
|
|
ELFNAME2(linux,atexit_signature)(p, epp, eh)
|
|
struct proc *p;
|
|
struct exec_package *epp;
|
|
Elf_Ehdr *eh;
|
|
{
|
|
size_t shsize;
|
|
int strndx;
|
|
size_t i;
|
|
static const char signature[] = "__libc_atexit";
|
|
char* strtable;
|
|
Elf_Shdr *sh;
|
|
|
|
int error;
|
|
|
|
/*
|
|
* load the section header table
|
|
*/
|
|
shsize = eh->e_shnum * sizeof(Elf_Shdr);
|
|
sh = (Elf_Shdr *) malloc(shsize, M_TEMP, M_WAITOK);
|
|
error = ELFNAME(read_from)(p, epp->ep_vp, eh->e_shoff, (caddr_t)sh,
|
|
shsize);
|
|
if (error)
|
|
goto out;
|
|
|
|
/*
|
|
* Now let's find the string table. If it does not exists, give up.
|
|
*/
|
|
strndx = (int)(eh->e_shstrndx);
|
|
if (strndx == SHN_UNDEF) {
|
|
error = ENOEXEC;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* strndx is the index in section header table of the string table section
|
|
* get the whole string table in strtable, and then we get access to the names
|
|
* s->sh_name is the offset of the section name in strtable.
|
|
*/
|
|
strtable = malloc(sh[strndx].sh_size, M_TEMP, M_WAITOK);
|
|
error = ELFNAME(read_from)(p, epp->ep_vp, sh[strndx].sh_offset,
|
|
(caddr_t)strtable, sh[strndx].sh_size);
|
|
if (error)
|
|
goto out;
|
|
|
|
for (i = 0; i < eh->e_shnum; i++) {
|
|
Elf_Shdr *s = &sh[i];
|
|
if (!memcmp((void*)(&(strtable[s->sh_name])), signature,
|
|
sizeof(signature))) {
|
|
#ifdef DEBUG_LINUX
|
|
printf("linux_atexit_sig=%s\n",&(strtable[s->sh_name]));
|
|
#endif
|
|
error = 0;
|
|
goto out;
|
|
}
|
|
}
|
|
error = ENOEXEC;
|
|
|
|
out:
|
|
free(sh, M_TEMP);
|
|
free(strtable, M_TEMP);
|
|
return (error);
|
|
}
|
|
#endif
|
|
|
|
#ifdef LINUX_GCC_SIGNATURE
|
|
/*
|
|
* Take advantage of the fact that all the linux binaries are compiled
|
|
* with gcc, and gcc sticks in the comment field a signature. Note that
|
|
* on SVR4 binaries, the gcc signature will follow the OS name signature,
|
|
* that will not be a problem. We don't bother to read in the string table,
|
|
* but we check all the progbits headers.
|
|
*
|
|
* XXX This only works in the i386. On the alpha (at least)
|
|
* XXX we have the same gcc signature which incorrectly identifies
|
|
* XXX NetBSD binaries as Linux.
|
|
*/
|
|
static int
|
|
ELFNAME2(linux,gcc_signature)(p, epp, eh)
|
|
struct proc *p;
|
|
struct exec_package *epp;
|
|
Elf_Ehdr *eh;
|
|
{
|
|
size_t shsize;
|
|
size_t i;
|
|
static const char signature[] = "\0GCC: (GNU) ";
|
|
char buf[sizeof(signature) - 1];
|
|
Elf_Shdr *sh;
|
|
int error;
|
|
|
|
shsize = eh->e_shnum * sizeof(Elf_Shdr);
|
|
sh = (Elf_Shdr *) malloc(shsize, M_TEMP, M_WAITOK);
|
|
error = ELFNAME(read_from)(p, epp->ep_vp, eh->e_shoff, (caddr_t)sh,
|
|
shsize);
|
|
if (error)
|
|
goto out;
|
|
|
|
for (i = 0; i < eh->e_shnum; i++) {
|
|
Elf_Shdr *s = &sh[i];
|
|
|
|
/*
|
|
* Identify candidates for the comment header;
|
|
* Header cannot have a load address, or flags and
|
|
* it must be large enough.
|
|
*/
|
|
if (s->sh_type != SHT_PROGBITS ||
|
|
s->sh_addr != 0 ||
|
|
s->sh_flags != 0 ||
|
|
s->sh_size < sizeof(signature) - 1)
|
|
continue;
|
|
|
|
error = ELFNAME(read_from)(p, epp->ep_vp, s->sh_offset,
|
|
(caddr_t)buf, sizeof(signature) - 1);
|
|
if (error)
|
|
continue;
|
|
|
|
/*
|
|
* error is 0, if the signatures match we are done.
|
|
*/
|
|
#ifdef DEBUG_LINUX
|
|
printf("linux_gcc_sig: sig=%s\n", buf);
|
|
#endif
|
|
if (!memcmp(buf, signature, sizeof(signature) - 1)) {
|
|
error = 0;
|
|
goto out;
|
|
}
|
|
}
|
|
error = ENOEXEC;
|
|
|
|
out:
|
|
free(sh, M_TEMP);
|
|
return (error);
|
|
}
|
|
#endif
|
|
|
|
static int
|
|
ELFNAME2(linux,signature)(p, epp, eh, itp)
|
|
struct proc *p;
|
|
struct exec_package *epp;
|
|
Elf_Ehdr *eh;
|
|
char *itp;
|
|
{
|
|
size_t i;
|
|
Elf_Phdr *ph;
|
|
size_t phsize;
|
|
int error;
|
|
|
|
phsize = eh->e_phnum * sizeof(Elf_Phdr);
|
|
ph = (Elf_Phdr *)malloc(phsize, M_TEMP, M_WAITOK);
|
|
error = ELFNAME(read_from)(p, epp->ep_vp, eh->e_phoff, (caddr_t)ph,
|
|
phsize);
|
|
if (error)
|
|
goto out;
|
|
|
|
for (i = 0; i < eh->e_phnum; i++) {
|
|
Elf_Phdr *ephp = &ph[i];
|
|
Elf_Nhdr *np;
|
|
u_int32_t *abi;
|
|
|
|
if (ephp->p_type != PT_NOTE ||
|
|
ephp->p_filesz > 1024 ||
|
|
ephp->p_filesz < sizeof(Elf_Nhdr) + 20)
|
|
continue;
|
|
|
|
np = (Elf_Nhdr *)malloc(ephp->p_filesz, M_TEMP, M_WAITOK);
|
|
error = ELFNAME(read_from)(p, epp->ep_vp, ephp->p_offset,
|
|
(caddr_t)np, ephp->p_filesz);
|
|
if (error)
|
|
goto next;
|
|
|
|
if (np->n_type != ELF_NOTE_TYPE_ABI_TAG ||
|
|
np->n_namesz != ELF_NOTE_ABI_NAMESZ ||
|
|
np->n_descsz != ELF_NOTE_ABI_DESCSZ ||
|
|
memcmp((caddr_t)(np + 1), ELF_NOTE_ABI_NAME,
|
|
ELF_NOTE_ABI_NAMESZ))
|
|
goto next;
|
|
|
|
/* Make sure the OS is Linux. */
|
|
abi = (u_int32_t *)((caddr_t)np + sizeof(Elf_Nhdr) +
|
|
np->n_namesz);
|
|
if (abi[0] == ELF_NOTE_ABI_OS_LINUX)
|
|
error = 0;
|
|
else
|
|
error = ENOEXEC;
|
|
free(np, M_TEMP);
|
|
goto out;
|
|
|
|
next:
|
|
free(np, M_TEMP);
|
|
continue;
|
|
}
|
|
|
|
/* Check for certain intepreter names. */
|
|
if (itp[0]) {
|
|
if (!strncmp(itp, "/lib/ld-linux", 13) ||
|
|
!strncmp(itp, "/lib/ld.so.", 11))
|
|
error = 0;
|
|
else
|
|
error = ENOEXEC;
|
|
goto out;
|
|
}
|
|
|
|
error = ENOEXEC;
|
|
out:
|
|
free(ph, M_TEMP);
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
ELFNAME2(linux,probe)(p, epp, eh, itp, pos)
|
|
struct proc *p;
|
|
struct exec_package *epp;
|
|
void *eh;
|
|
char *itp;
|
|
vaddr_t *pos;
|
|
{
|
|
const char *bp;
|
|
int error;
|
|
size_t len;
|
|
|
|
#ifdef LINUX_GCC_SIGNATURE
|
|
if ((error = ELFNAME2(linux,signature)(p, epp, eh, itp)) != 0)
|
|
if ((error = ELFNAME2(linux,gcc_signature)(p, epp, eh)) != 0)
|
|
return error;
|
|
#else
|
|
#ifdef LINUX_ATEXIT_SIGNATURE
|
|
if ((error = ELFNAME2(linux,signature)(p, epp, eh, itp)) != 0)
|
|
if ((error = ELFNAME2(linux,atexit_signature)(p, epp, eh)) != 0)
|
|
return error;
|
|
#else
|
|
if ((error = ELFNAME2(linux,signature)(p, epp, eh, itp)) != 0)
|
|
return error;
|
|
#endif
|
|
#endif
|
|
|
|
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, &len)))
|
|
return error;
|
|
free((void *)bp, M_TEMP);
|
|
}
|
|
*pos = ELF_NO_ADDR;
|
|
#ifdef DEBUG_LINUX
|
|
printf("linux_probe: returning 0\n");
|
|
#endif
|
|
return 0;
|
|
}
|
|
|