675 lines
16 KiB
C
675 lines
16 KiB
C
/* $NetBSD: exec_elf32.c,v 1.29 1998/05/08 18:18:55 kleink Exp $ */
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/*
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* Copyright (c) 1996 Christopher G. Demetriou
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* Copyright (c) 1994 Christos Zoulas
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* All rights reserved.
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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. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/* If not included by exec_elf64.c, ELFSIZE won't be defined. */
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#ifndef ELFSIZE
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#define ELFSIZE 32
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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/exec.h>
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#include <sys/exec_elf.h>
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#include <sys/fcntl.h>
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#include <sys/syscall.h>
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#include <sys/signalvar.h>
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#include <sys/mount.h>
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#include <sys/stat.h>
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#include <sys/mman.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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#ifdef COMPAT_LINUX
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#include <compat/linux/linux_exec.h>
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#endif
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#ifdef COMPAT_SVR4
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#include <compat/svr4/svr4_exec.h>
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#endif
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#ifdef COMPAT_IBCS2
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#include <compat/ibcs2/ibcs2_exec.h>
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#endif
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#define CONCAT(x,y) __CONCAT(x,y)
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#define ELFNAME(x) CONCAT(elf,CONCAT(ELFSIZE,CONCAT(_,x)))
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#define ELFNAME2(x,y) CONCAT(x,CONCAT(_elf,CONCAT(ELFSIZE,CONCAT(_,y))))
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#define ELFNAMEEND(x) CONCAT(x,CONCAT(_elf,ELFSIZE))
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#define ELFDEFNNAME(x) CONCAT(ELF,CONCAT(ELFSIZE,CONCAT(_,x)))
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int ELFNAME(check_header) __P((Elf_Ehdr *, int));
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int ELFNAME(load_file) __P((struct proc *, struct exec_package *, char *,
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struct exec_vmcmd_set *, u_long *, struct elf_args *, Elf_Addr *));
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void ELFNAME(load_psection) __P((struct exec_vmcmd_set *, struct vnode *,
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Elf_Phdr *, Elf_Addr *, u_long *, int *));
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extern char sigcode[], esigcode[];
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#ifdef SYSCALL_DEBUG
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extern char *syscallnames[];
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#endif
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struct emul ELFNAMEEND(emul_netbsd) = {
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"netbsd",
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NULL,
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sendsig,
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SYS_syscall,
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SYS_MAXSYSCALL,
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sysent,
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#ifdef SYSCALL_DEBUG
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syscallnames,
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#else
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NULL,
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#endif
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ELF_AUX_ENTRIES * sizeof(AuxInfo),
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ELFNAME(copyargs),
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setregs,
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sigcode,
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esigcode,
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};
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int (*ELFNAME(probe_funcs)[]) __P((struct proc *, struct exec_package *,
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Elf_Ehdr *, char *, Elf_Addr *)) = {
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#if defined(COMPAT_LINUX) && (ELFSIZE == 32)
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ELFNAME2(linux,probe), /* XXX not 64-bit safe */
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#endif
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#if defined(COMPAT_SVR4) && (ELFSIZE == 32)
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ELFNAME2(svr4,probe), /* XXX not 64-bit safe */
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#endif
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#if defined(COMPAT_IBCS2) && (ELFSIZE == 32)
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ELFNAME2(ibcs2,probe), /* XXX not 64-bit safe */
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#endif
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};
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/* round up and down to page boundaries. */
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#define ELF_ROUND(a, b) (((a) + (b) - 1) & ~((b) - 1))
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#define ELF_TRUNC(a, b) ((a) & ~((b) - 1))
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/*
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* Copy arguments onto the stack in the normal way, but add some
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* extra information in case of dynamic binding.
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*/
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void *
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ELFNAME(copyargs)(pack, arginfo, stack, argp)
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struct exec_package *pack;
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struct ps_strings *arginfo;
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void *stack;
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void *argp;
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{
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size_t len;
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AuxInfo ai[ELF_AUX_ENTRIES], *a;
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struct elf_args *ap;
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stack = copyargs(pack, arginfo, stack, argp);
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if (!stack)
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return NULL;
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a = ai;
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/*
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* Push extra arguments on the stack needed by dynamically
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* linked binaries
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*/
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if ((ap = (struct elf_args *)pack->ep_emul_arg)) {
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a->au_id = AUX_phdr;
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a->au_v = ap->arg_phaddr;
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a++;
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a->au_id = AUX_phent;
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a->au_v = ap->arg_phentsize;
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a++;
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a->au_id = AUX_phnum;
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a->au_v = ap->arg_phnum;
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a++;
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a->au_id = AUX_pagesz;
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a->au_v = NBPG;
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a++;
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a->au_id = AUX_base;
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a->au_v = ap->arg_interp;
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a++;
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a->au_id = AUX_flags;
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a->au_v = 0;
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a++;
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a->au_id = AUX_entry;
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a->au_v = ap->arg_entry;
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a++;
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free((char *)ap, M_TEMP);
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pack->ep_emul_arg = NULL;
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}
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a->au_id = AUX_null;
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a->au_v = 0;
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a++;
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len = (a - ai) * sizeof (AuxInfo);
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if (copyout(ai, stack, len))
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return NULL;
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(caddr_t)stack += len;
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return stack;
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}
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/*
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* elf_check_header():
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*
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* Check header for validity; return 0 of ok ENOEXEC if error
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*/
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int
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ELFNAME(check_header)(eh, type)
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Elf_Ehdr *eh;
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int type;
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{
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if (bcmp(eh->e_ident, Elf_e_ident, Elf_e_siz) != 0)
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return ENOEXEC;
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switch (eh->e_machine) {
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ELFDEFNNAME(MACHDEP_ID_CASES)
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default:
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return ENOEXEC;
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}
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if (eh->e_type != type)
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return ENOEXEC;
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return 0;
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}
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/*
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* elf_load_psection():
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*
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* Load a psection at the appropriate address
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*/
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void
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ELFNAME(load_psection)(vcset, vp, ph, addr, size, prot)
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struct exec_vmcmd_set *vcset;
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struct vnode *vp;
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Elf_Phdr *ph;
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Elf_Addr *addr;
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u_long *size;
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int *prot;
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{
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u_long uaddr, msize, psize, rm, rf;
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long diff, offset;
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/*
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* If the user specified an address, then we load there.
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*/
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if (*addr != ELFDEFNNAME(NO_ADDR)) {
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if (ph->p_align > 1) {
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*addr = ELF_ROUND(*addr, ph->p_align);
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uaddr = ELF_TRUNC(ph->p_vaddr, ph->p_align);
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} else
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uaddr = ph->p_vaddr;
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diff = ph->p_vaddr - uaddr;
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} else {
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*addr = uaddr = ph->p_vaddr;
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if (ph->p_align > 1)
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*addr = ELF_TRUNC(uaddr, ph->p_align);
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diff = uaddr - *addr;
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}
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*prot |= (ph->p_flags & Elf_pf_r) ? VM_PROT_READ : 0;
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*prot |= (ph->p_flags & Elf_pf_w) ? VM_PROT_WRITE : 0;
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*prot |= (ph->p_flags & Elf_pf_x) ? VM_PROT_EXECUTE : 0;
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offset = ph->p_offset - diff;
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*size = ph->p_filesz + diff;
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msize = ph->p_memsz + diff;
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psize = round_page(*size);
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if ((ph->p_flags & Elf_pf_w) != 0) {
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/*
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* Because the pagedvn pager can't handle zero fill of the last
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* data page if it's not page aligned we map the last page
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* readvn.
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*/
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psize = trunc_page(*size);
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NEW_VMCMD(vcset, vmcmd_map_pagedvn, psize, *addr, vp,
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offset, *prot);
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if(psize != *size)
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NEW_VMCMD(vcset, vmcmd_map_readvn, *size - psize,
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*addr + psize, vp, offset + psize, *prot);
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} else
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NEW_VMCMD(vcset, vmcmd_map_pagedvn, psize, *addr, vp,
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offset, *prot);
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/*
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* Check if we need to extend the size of the segment
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*/
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rm = round_page(*addr + msize);
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rf = round_page(*addr + *size);
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if (rm != rf) {
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NEW_VMCMD(vcset, vmcmd_map_zero, rm - rf, rf, NULLVP,
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0, *prot);
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*size = msize;
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}
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}
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/*
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* elf_read_from():
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*
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* Read from vnode into buffer at offset.
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*/
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int
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ELFNAME(read_from)(p, vp, off, buf, size)
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struct vnode *vp;
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u_long off;
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struct proc *p;
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caddr_t buf;
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int size;
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{
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int error;
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int resid;
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if ((error = vn_rdwr(UIO_READ, vp, buf, size, off, UIO_SYSSPACE,
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0, p->p_ucred, &resid, p)) != 0)
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return error;
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/*
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* See if we got all of it
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*/
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if (resid != 0)
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return ENOEXEC;
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return 0;
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}
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/*
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* elf_load_file():
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*
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* Load a file (interpreter/library) pointed to by path
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* [stolen from coff_load_shlib()]. Made slightly generic
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* so it might be used externally.
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*/
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int
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ELFNAME(load_file)(p, epp, path, vcset, entry, ap, last)
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struct proc *p;
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struct exec_package *epp;
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char *path;
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struct exec_vmcmd_set *vcset;
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u_long *entry;
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struct elf_args *ap;
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Elf_Addr *last;
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{
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int error, i;
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struct nameidata nd;
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struct vnode *vp;
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struct vattr attr;
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Elf_Ehdr eh;
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Elf_Phdr *ph = NULL;
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u_long phsize;
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char *bp = NULL;
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Elf_Addr addr = *last;
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bp = path;
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/*
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* 1. open file
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* 2. read filehdr
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* 3. map text, data, and bss out of it using VM_*
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*/
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NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, path, p);
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if ((error = namei(&nd)) != 0)
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return error;
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vp = nd.ni_vp;
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/*
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* Similarly, if it's not marked as executable, or it's not a regular
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* file, we don't allow it to be used.
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*/
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if (vp->v_type != VREG) {
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error = EACCES;
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goto badunlock;
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}
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if ((error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p)) != 0)
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goto badunlock;
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/* get attributes */
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if ((error = VOP_GETATTR(vp, &attr, p->p_ucred, p)) != 0)
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goto badunlock;
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/*
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* Check mount point. Though we're not trying to exec this binary,
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* we will be executing code from it, so if the mount point
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* disallows execution or set-id-ness, we punt or kill the set-id.
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*/
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if (vp->v_mount->mnt_flag & MNT_NOEXEC) {
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error = EACCES;
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goto badunlock;
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}
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if (vp->v_mount->mnt_flag & MNT_NOSUID)
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epp->ep_vap->va_mode &= ~(S_ISUID | S_ISGID);
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#ifdef notyet /* XXX cgd 960926 */
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XXX cgd 960926: (maybe) VOP_OPEN it (and VOP_CLOSE in copyargs?)
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#endif
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VOP_UNLOCK(vp, 0);
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if ((error = ELFNAME(read_from)(p, vp, 0, (caddr_t) &eh,
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sizeof(eh))) != 0)
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goto bad;
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if ((error = ELFNAME(check_header)(&eh, Elf_et_dyn)) != 0)
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goto bad;
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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, vp, eh.e_phoff,
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(caddr_t) ph, phsize)) != 0)
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goto bad;
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/*
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* Load all the necessary sections
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*/
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for (i = 0; i < eh.e_phnum; i++) {
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u_long size = 0;
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int prot = 0;
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switch (ph[i].p_type) {
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case Elf_pt_load:
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ELFNAME(load_psection)(vcset, vp, &ph[i], &addr,
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&size, &prot);
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/* If entry is within this section it must be text */
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if (eh.e_entry >= ph[i].p_vaddr &&
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eh.e_entry < (ph[i].p_vaddr + size)) {
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/* XXX */
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*entry = addr + eh.e_entry;
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#ifdef mips
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*entry -= ph[i].p_vaddr;
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#endif
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ap->arg_interp = addr;
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}
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addr += size;
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break;
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case Elf_pt_dynamic:
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case Elf_pt_phdr:
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case Elf_pt_note:
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break;
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default:
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break;
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}
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}
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free((char *)ph, M_TEMP);
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*last = addr;
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vrele(vp);
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return 0;
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badunlock:
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VOP_UNLOCK(vp, 0);
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bad:
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if (ph != NULL)
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free((char *)ph, M_TEMP);
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#ifdef notyet /* XXX cgd 960926 */
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(maybe) VOP_CLOSE it
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#endif
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vrele(vp);
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return error;
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}
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/*
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* exec_elf_makecmds(): Prepare an Elf binary's exec package
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*
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* First, set of the various offsets/lengths in the exec package.
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*
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* Then, mark the text image busy (so it can be demand paged) or error
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* out if this is not possible. Finally, set up vmcmds for the
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* text, data, bss, and stack segments.
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*/
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int
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ELFNAME2(exec,makecmds)(p, epp)
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struct proc *p;
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struct exec_package *epp;
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{
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Elf_Ehdr *eh = epp->ep_hdr;
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Elf_Phdr *ph, *pp;
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Elf_Addr phdr = 0, pos = 0;
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int error, i, n, nload;
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char interp[MAXPATHLEN];
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u_long phsize;
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if (epp->ep_hdrvalid < sizeof(Elf_Ehdr))
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return ENOEXEC;
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if (ELFNAME(check_header)(eh, Elf_et_exec))
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return ENOEXEC;
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/*
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* check if vnode is in open for writing, because we want to
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* demand-page out of it. if it is, don't do it, for various
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* reasons
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*/
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if (epp->ep_vp->v_writecount != 0) {
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#ifdef DIAGNOSTIC
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if (epp->ep_vp->v_flag & VTEXT)
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panic("exec: a VTEXT vnode has writecount != 0\n");
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#endif
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return ETXTBSY;
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}
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/*
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* Allocate space to hold all the program headers, and read them
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* from the file
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*/
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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 bad;
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epp->ep_taddr = epp->ep_tsize = ELFDEFNNAME(NO_ADDR);
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epp->ep_daddr = epp->ep_dsize = ELFDEFNNAME(NO_ADDR);
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interp[0] = '\0';
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for (i = 0; i < eh->e_phnum; i++) {
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pp = &ph[i];
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if (pp->p_type == Elf_pt_interp) {
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if (pp->p_filesz >= sizeof(interp))
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goto bad;
|
|
if ((error = ELFNAME(read_from)(p, epp->ep_vp,
|
|
pp->p_offset, (caddr_t) interp,
|
|
pp->p_filesz)) != 0)
|
|
goto bad;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Setup things for native emulation.
|
|
*/
|
|
epp->ep_emul = &ELFNAMEEND(emul_netbsd);
|
|
pos = ELFDEFNNAME(NO_ADDR);
|
|
|
|
/*
|
|
* On the same architecture, we may be emulating different systems.
|
|
* See which one will accept this executable. This currently only
|
|
* applies to Linux, SVR4, and IBCS2 on the i386.
|
|
*
|
|
* Probe functions would normally see if the interpreter (if any)
|
|
* exists. Emulation packages may possibly replace the interpreter in
|
|
* interp[] with a changed path (/emul/xxx/<path>), and also
|
|
* set the ep_emul field in the exec package structure.
|
|
*/
|
|
n = sizeof ELFNAME(probe_funcs) / sizeof ELFNAME(probe_funcs)[0];
|
|
if (n != 0) {
|
|
error = ENOEXEC;
|
|
for (i = 0; i < n && error; i++)
|
|
error = ELFNAME(probe_funcs)[i](p, epp, eh,
|
|
interp, &pos);
|
|
|
|
#ifdef notyet
|
|
/*
|
|
* We should really use a signature in our native binaries
|
|
* and have our own probe function for matching binaries,
|
|
* before trying the emulations. For now, if the emulation
|
|
* probes failed we default to native.
|
|
*/
|
|
if (error)
|
|
goto bad;
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Load all the necessary sections
|
|
*/
|
|
for (i = nload = 0; i < eh->e_phnum; i++) {
|
|
Elf_Addr addr = ELFDEFNNAME(NO_ADDR);
|
|
u_long size = 0;
|
|
int prot = 0;
|
|
|
|
pp = &ph[i];
|
|
|
|
switch (ph[i].p_type) {
|
|
case Elf_pt_load:
|
|
/*
|
|
* XXX
|
|
* Can handle only 2 sections: text and data
|
|
*/
|
|
if (nload++ == 2)
|
|
goto bad;
|
|
ELFNAME(load_psection)(&epp->ep_vmcmds, epp->ep_vp,
|
|
&ph[i], &addr, &size, &prot);
|
|
|
|
/*
|
|
* Decide whether it's text or data by looking
|
|
* at the entry point.
|
|
*/
|
|
if (eh->e_entry >= addr &&
|
|
eh->e_entry < (addr + size)) {
|
|
epp->ep_taddr = addr;
|
|
epp->ep_tsize = size;
|
|
if (epp->ep_daddr == ELFDEFNNAME(NO_ADDR)) {
|
|
epp->ep_daddr = addr;
|
|
epp->ep_dsize = size;
|
|
}
|
|
} else {
|
|
epp->ep_daddr = addr;
|
|
epp->ep_dsize = size;
|
|
}
|
|
break;
|
|
|
|
case Elf_pt_shlib:
|
|
#ifndef COMPAT_IBCS2 /* SCO has these sections */
|
|
error = ENOEXEC;
|
|
goto bad;
|
|
#endif
|
|
|
|
case Elf_pt_interp:
|
|
/* Already did this one */
|
|
case Elf_pt_dynamic:
|
|
case Elf_pt_note:
|
|
break;
|
|
|
|
case Elf_pt_phdr:
|
|
/* Note address of program headers (in text segment) */
|
|
phdr = pp->p_vaddr;
|
|
break;
|
|
|
|
default:
|
|
/*
|
|
* Not fatal; we don't need to understand everything.
|
|
*/
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* this breaks on, e.g., OpenBSD-compatible mips shared binaries. */
|
|
#ifndef ELF_INTERP_NON_RELOCATABLE
|
|
/*
|
|
* If no position to load the interpreter was set by a probe
|
|
* function, pick the same address that a non-fixed mmap(0, ..)
|
|
* would (i.e. something safely out of the way).
|
|
*/
|
|
if (pos == ELFDEFNNAME(NO_ADDR))
|
|
pos = round_page(epp->ep_daddr + MAXDSIZ);
|
|
#endif /* !ELF_INTERP_NON_RELOCATABLE */
|
|
|
|
/*
|
|
* Check if we found a dynamically linked binary and arrange to load
|
|
* it's interpreter
|
|
*/
|
|
if (interp[0]) {
|
|
struct elf_args *ap;
|
|
|
|
ap = (struct elf_args *)malloc(sizeof(struct elf_args),
|
|
M_TEMP, M_WAITOK);
|
|
if ((error = ELFNAME(load_file)(p, epp, interp,
|
|
&epp->ep_vmcmds, &epp->ep_entry, ap, &pos)) != 0) {
|
|
free((char *)ap, M_TEMP);
|
|
goto bad;
|
|
}
|
|
pos += phsize;
|
|
ap->arg_phaddr = phdr;
|
|
|
|
ap->arg_phentsize = eh->e_phentsize;
|
|
ap->arg_phnum = eh->e_phnum;
|
|
ap->arg_entry = eh->e_entry;
|
|
|
|
epp->ep_emul_arg = ap;
|
|
} else
|
|
epp->ep_entry = eh->e_entry;
|
|
|
|
#ifdef ELF_MAP_PAGE_ZERO
|
|
/* Dell SVR4 maps page zero, yeuch! */
|
|
NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, NBPG, 0, epp->ep_vp, 0,
|
|
VM_PROT_READ);
|
|
#endif
|
|
free((char *)ph, M_TEMP);
|
|
epp->ep_vp->v_flag |= VTEXT;
|
|
return exec_elf_setup_stack(p, epp);
|
|
|
|
bad:
|
|
free((char *)ph, M_TEMP);
|
|
kill_vmcmds(&epp->ep_vmcmds);
|
|
return ENOEXEC;
|
|
}
|