310 lines
8.1 KiB
C
310 lines
8.1 KiB
C
/* $NetBSD: linux_exec_elf32.c,v 1.43 1999/10/25 13:55:07 kleink Exp $ */
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/*-
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* Copyright (c) 1995, 1998 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Christos Zoulas, Frank van der Linden and Eric Haszlakiewicz.
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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 the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* based on exec_aout.c, sunos_exec.c and svr4_exec.c
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*/
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#ifndef ELFSIZE
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#define ELFSIZE 32 /* XXX should die */
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#endif
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/proc.h>
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#include <sys/malloc.h>
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#include <sys/namei.h>
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#include <sys/vnode.h>
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#include <sys/mount.h>
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#include <sys/exec.h>
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#include <sys/exec_elf.h>
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#include <sys/mman.h>
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#include <sys/syscallargs.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <vm/vm_map.h>
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#include <machine/cpu.h>
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#include <machine/reg.h>
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#include <compat/linux/common/linux_types.h>
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#include <compat/linux/common/linux_signal.h>
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#include <compat/linux/common/linux_util.h>
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#include <compat/linux/common/linux_exec.h>
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#include <compat/linux/common/linux_machdep.h>
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#include <compat/linux/common/linux_errno.h>
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#include <compat/linux/linux_syscallargs.h>
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#include <compat/linux/linux_syscall.h>
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static int ELFNAME2(linux,signature) __P((struct proc *, struct exec_package *,
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Elf_Ehdr *));
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#ifdef LINUX_GCC_SIGNATURE
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static int ELFNAME2(linux,gcc_signature) __P((struct proc *p,
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struct exec_package *, Elf_Ehdr *));
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#endif
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#define LINUX_ELF_AUX_ARGSIZ howmany(sizeof(AuxInfo) * 8, sizeof(char *))
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extern char linux_sigcode[], linux_esigcode[];
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extern struct sysent linux_sysent[];
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extern char *linux_syscallnames[];
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struct emul ELFNAMEEND(emul_linux) = {
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"linux",
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native_to_linux_errno,
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linux_sendsig,
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LINUX_SYS_syscall,
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LINUX_SYS_MAXSYSCALL,
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linux_sysent,
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linux_syscallnames,
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LINUX_ELF_AUX_ARGSIZ,
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ELFNAME(copyargs),
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linux_setregs,
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linux_sigcode,
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linux_esigcode,
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};
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#ifdef LINUX_GCC_SIGNATURE
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/*
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* Take advantage of the fact that all the linux binaries are compiled
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* with gcc, and gcc sticks in the comment field a signature. Note that
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* on SVR4 binaries, the gcc signature will follow the OS name signature,
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* that will not be a problem. We don't bother to read in the string table,
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* but we check all the progbits headers.
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*
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* XXX This only works in the i386. On the alpha (at least)
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* XXX we have the same gcc signature which incorrectly identifies
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* XXX NetBSD binaries as Linux.
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*/
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static int
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ELFNAME2(linux,gcc_signature)(p, epp, eh)
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struct proc *p;
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struct exec_package *epp;
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Elf_Ehdr *eh;
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{
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size_t shsize = sizeof(Elf_Shdr) * eh->e_shnum;
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size_t i;
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static const char signature[] = "\0GCC: (GNU) ";
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char buf[sizeof(signature) - 1];
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Elf_Shdr *sh;
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int error;
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error = ENOEXEC;
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sh = (Elf_Shdr *) malloc(shsize, M_TEMP, M_WAITOK);
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if ((error = ELFNAME(read_from)(p, epp->ep_vp, eh->e_shoff,
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(caddr_t) sh, shsize)) != 0)
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goto out;
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for (i = 0; i < eh->e_shnum; i++) {
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Elf_Shdr *s = &sh[i];
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/*
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* Identify candidates for the comment header;
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* Header cannot have a load address, or flags and
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* it must be large enough.
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*/
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if (s->sh_type != SHT_PROGBITS ||
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s->sh_addr != 0 ||
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s->sh_flags != 0 ||
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s->sh_size < sizeof(signature) - 1)
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continue;
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if ((error = ELFNAME(read_from)(p, epp->ep_vp, s->sh_offset,
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(caddr_t) buf, sizeof(signature) - 1)) != 0)
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goto out;
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/*
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* error is 0, if the signatures match we are done.
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*/
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#ifdef DEBUG_LINUX
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printf("linux_gcc_sig: sig=%s\n", buf);
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#endif
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if (memcmp(buf, signature, sizeof(signature) - 1) == 0)
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goto out;
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}
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out:
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free(sh, M_TEMP);
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#ifdef DEBUG_LINUX
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printf("linux_gcc_sig: returning %d\n", error);
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#endif
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return error;
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}
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#endif
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static int
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ELFNAME2(linux,signature)(p, epp, eh)
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struct proc *p;
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struct exec_package *epp;
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Elf_Ehdr *eh;
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{
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size_t i;
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Elf_Phdr *ph;
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Elf_Nhdr *notep;
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size_t phsize;
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int error = ENOEXEC;
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phsize = eh->e_phnum * sizeof(Elf_Phdr);
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ph = (Elf_Phdr *)malloc(phsize, M_TEMP, M_WAITOK);
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if ((error = ELFNAME(read_from)(p, epp->ep_vp, eh->e_phoff,
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(caddr_t) ph, phsize)) != 0)
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goto out1;
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for (i = 0; i < eh->e_phnum; i++) {
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Elf_Phdr *ephp = &ph[i];
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u_int32_t ostype;
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if (ephp->p_type != PT_INTERP /* XAX PT_NOTE */
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#if 0
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|| ephp->p_flags != 0
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|| ephp->p_filesz < sizeof(Elf_Nhdr))
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#endif
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)
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continue;
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notep = (Elf_Nhdr *)malloc(ephp->p_filesz+1, M_TEMP, M_WAITOK);
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if ((error = ELFNAME(read_from)(p, epp->ep_vp, ephp->p_offset,
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(caddr_t)notep, ephp->p_filesz)) != 0)
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goto out3;
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/* Check for "linux" in the intepreter name. */
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if (ephp->p_filesz < 8 + 5) {
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error = ENOEXEC;
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goto out3;
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}
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#ifdef DEBUG_LINUX
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printf("linux_signature: interp=%s\n", notep);
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#endif
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if (strncmp(&((char *)notep)[8], "linux", 5) == 0 ||
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strncmp((char *)notep, "/lib/ld.so.", 11) == 0) {
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error = 0;
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goto out3;
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}
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goto out2;
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/* XXX XAX Should handle NETBSD_TYPE_EMULNAME */
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if (notep->n_type != ELF_NOTE_TYPE_OSVERSION) {
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free(notep, M_TEMP);
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continue;
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}
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/* Check the name and description sizes. */
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if (notep->n_namesz != ELF_NOTE_GNU_NAMESZ ||
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notep->n_descsz != ELF_NOTE_GNU_DESCSZ)
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goto out2;
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/* Is the name "GNU\0"? */
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if (memcmp((notep + sizeof(Elf_Nhdr)),
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ELF_NOTE_GNU_NAME, ELF_NOTE_GNU_NAMESZ))
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goto out2;
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/* Make sure the OS is Linux */
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ostype = (u_int32_t)(*((u_int32_t *)notep + sizeof(Elf_Nhdr) +
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notep->n_namesz)) & ELF_NOTE_GNU_OSMASK;
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if (ostype != ELF_NOTE_GNU_OSLINUX)
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goto out2;
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/* All checks succeeded. */
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error = 0;
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goto out3;
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}
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error = ENOEXEC;
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out1:
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free(ph, M_TEMP);
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#ifdef DEBUG_LINUX
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printf("linux_signature: out1=%d\n", error);
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#endif
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return error;
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out2:
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error = ENOEXEC;
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out3:
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free(notep, M_TEMP);
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free(ph, M_TEMP);
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#ifdef DEBUG_LINUX
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printf("linux_signature: out2,3=%d\n", error);
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#endif
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return error;
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}
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int
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ELFNAME2(linux,probe)(p, epp, eh, itp, pos)
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struct proc *p;
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struct exec_package *epp;
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Elf_Ehdr *eh;
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char *itp;
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Elf_Addr *pos;
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{
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const char *bp;
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int error;
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size_t len;
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if ((error = ELFNAME2(linux,signature)(p, epp, eh)) != 0)
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#ifdef LINUX_GCC_SIGNATURE
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if ((error = ELFNAME2(linux,gcc_signature)(p, epp, eh)) != 0)
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return error;
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#else
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return error;
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#endif
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if (itp[0]) {
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if ((error = emul_find(p, NULL, linux_emul_path, itp, &bp, 0)))
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return error;
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if ((error = copystr(bp, itp, MAXPATHLEN, &len)))
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return error;
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free((void *)bp, M_TEMP);
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}
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epp->ep_emul = &ELFNAMEEND(emul_linux);
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*pos = ELF_NO_ADDR;
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#ifdef DEBUG_LINUX
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printf("linux_probe: returning 0\n");
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#endif
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return 0;
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}
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