NetBSD/sys/compat/linux/common/linux_exec_elf32.c

310 lines
8.1 KiB
C

/* $NetBSD: linux_exec_elf32.c,v 1.42 1999/04/30 23:07:01 cgd Exp $ */
/*-
* Copyright (c) 1995, 1998 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 and Eric Haszlakiewicz.
*
* 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 <vm/vm.h>
#include <vm/vm_param.h>
#include <vm/vm_map.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/common/linux_errno.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 *));
#ifdef LINUX_GCC_SIGNATURE
static int ELFNAME2(linux,gcc_signature) __P((struct proc *p,
struct exec_package *, Elf_Ehdr *));
#endif
#define LINUX_ELF_AUX_ARGSIZ howmany(sizeof(AuxInfo) * 8, sizeof(char *))
extern char linux_sigcode[], linux_esigcode[];
extern struct sysent linux_sysent[];
extern char *linux_syscallnames[];
struct emul ELFNAMEEND(emul_linux) = {
"linux",
native_to_linux_errno,
linux_sendsig,
LINUX_SYS_syscall,
LINUX_SYS_MAXSYSCALL,
linux_sysent,
linux_syscallnames,
LINUX_ELF_AUX_ARGSIZ,
ELFNAME(copyargs),
linux_setregs,
linux_sigcode,
linux_esigcode,
};
#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 = sizeof(Elf_Shdr) * eh->e_shnum;
size_t i;
static const char signature[] = "\0GCC: (GNU) ";
char buf[sizeof(signature) - 1];
Elf_Shdr *sh;
int error;
error = ENOEXEC;
sh = (Elf_Shdr *) malloc(shsize, M_TEMP, M_WAITOK);
if ((error = ELFNAME(read_from)(p, epp->ep_vp, eh->e_shoff,
(caddr_t) sh, shsize)) != 0)
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 != Elf_sht_progbits ||
s->sh_addr != 0 ||
s->sh_flags != 0 ||
s->sh_size < sizeof(signature) - 1)
continue;
if ((error = ELFNAME(read_from)(p, epp->ep_vp, s->sh_offset,
(caddr_t) buf, sizeof(signature) - 1)) != 0)
goto out;
/*
* 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) == 0)
goto out;
}
out:
free(sh, M_TEMP);
#ifdef DEBUG_LINUX
printf("linux_gcc_sig: returning %d\n", error);
#endif
return error;
}
#endif
static int
ELFNAME2(linux,signature)(p, epp, eh)
struct proc *p;
struct exec_package *epp;
Elf_Ehdr *eh;
{
size_t i;
Elf_Phdr *ph;
Elf_Note *notep;
size_t phsize;
int error = ENOEXEC;
phsize = eh->e_phnum * sizeof(Elf_Phdr);
ph = (Elf_Phdr *)malloc(phsize, M_TEMP, M_WAITOK);
if ((error = ELFNAME(read_from)(p, epp->ep_vp, eh->e_phoff,
(caddr_t) ph, phsize)) != 0)
goto out1;
for (i = 0; i < eh->e_phnum; i++) {
Elf_Phdr *ephp = &ph[i];
u_int32_t ostype;
if (ephp->p_type != Elf_pt_interp /* XAX pt_note */
#if 0
|| ephp->p_flags != 0
|| ephp->p_filesz < sizeof(Elf_Note))
#endif
)
continue;
notep = (Elf_Note *)malloc(ephp->p_filesz+1, M_TEMP, M_WAITOK);
if ((error = ELFNAME(read_from)(p, epp->ep_vp, ephp->p_offset,
(caddr_t)notep, ephp->p_filesz)) != 0)
goto out3;
/* Check for "linux" in the intepreter name. */
if (ephp->p_filesz < 8 + 5) {
error = ENOEXEC;
goto out3;
}
#ifdef DEBUG_LINUX
printf("linux_signature: interp=%s\n", notep);
#endif
if (strncmp(&((char *)notep)[8], "linux", 5) == 0 ||
strncmp((char *)notep, "/lib/ld.so.", 11) == 0) {
error = 0;
goto out3;
}
goto out2;
/* XXX XAX Should handle NETBSD_TYPE_EMULNAME */
if (notep->type != ELF_NOTE_TYPE_OSVERSION) {
free(notep, M_TEMP);
continue;
}
/* Check the name and description sizes. */
if (notep->namesz != ELF_NOTE_GNU_NAMESZ ||
notep->descsz != ELF_NOTE_GNU_DESCSZ)
goto out2;
/* Is the name "GNU\0"? */
if (memcmp((notep + sizeof(Elf_Note)),
ELF_NOTE_GNU_NAME, ELF_NOTE_GNU_NAMESZ))
goto out2;
/* Make sure the OS is Linux */
ostype = (u_int32_t)(*((u_int32_t *)notep + sizeof(Elf_Note) +
notep->namesz)) & ELF_NOTE_GNU_OSMASK;
if (ostype != ELF_NOTE_GNU_OSLINUX)
goto out2;
/* All checks succeeded. */
error = 0;
goto out3;
}
error = ENOEXEC;
out1:
free(ph, M_TEMP);
#ifdef DEBUG_LINUX
printf("linux_signature: out1=%d\n", error);
#endif
return error;
out2:
error = ENOEXEC;
out3:
free(notep, M_TEMP);
free(ph, M_TEMP);
#ifdef DEBUG_LINUX
printf("linux_signature: out2,3=%d\n", error);
#endif
return error;
}
int
ELFNAME2(linux,probe)(p, epp, eh, itp, pos)
struct proc *p;
struct exec_package *epp;
Elf_Ehdr *eh;
char *itp;
Elf_Addr *pos;
{
const char *bp;
int error;
size_t len;
if ((error = ELFNAME2(linux,signature)(p, epp, eh)) != 0)
#ifdef LINUX_GCC_SIGNATURE
if ((error = ELFNAME2(linux,gcc_signature)(p, epp, eh)) != 0)
return error;
#else
return error;
#endif
if (itp[0]) {
if ((error = emul_find(p, NULL, linux_emul_path, itp, &bp, 0)))
return error;
if ((error = copystr(bp, itp, MAXPATHLEN, &len)))
return error;
free((void *)bp, M_TEMP);
}
epp->ep_emul = &ELFNAMEEND(emul_linux);
*pos = ELF_NO_ADDR;
#ifdef DEBUG_LINUX
printf("linux_probe: returning 0\n");
#endif
return 0;
}