path: root/exec/exec.c

/* GNU Hurd standard exec server.
   Copyright (C) 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
   Written by Roland McGrath.

   Can exec ELF format directly.
   #ifdef GZIP
   Can gunzip executables into core on the fly.
   #endif
   #ifdef BFD
   Can exec any executable format the BFD library understands
   to be for this flavor of machine.
   #endif

This file is part of the GNU Hurd.

The GNU Hurd is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

The GNU Hurd is distributed in the hope that it will be useful, 
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with the GNU Hurd; see the file COPYING.  If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */



#include "priv.h"
#include <hurd.h>
#include <hurd/exec.h>
#include <hurd/shared.h>
#include <sys/stat.h>
#include <unistd.h>

mach_port_t procserver;	/* Our proc port.  */

/* Standard exec data for secure execs.  */
mach_port_t *std_ports;
int *std_ints;
size_t std_nports, std_nints;
struct rwlock std_lock = RWLOCK_INITIALIZER;


#ifdef	BFD
/* Return a Hurd error code corresponding to the most recent BFD error.  */
static error_t
b2he (error_t deflt)
{
  switch (bfd_get_error ())
    {
    case bfd_error_system_call:
      return errno;

    case bfd_error_no_memory:
      return ENOMEM;

    default:
      return deflt;
    }
}
#else
#define	b2he()	a2he (errno)
#endif

#ifdef GZIP
static void check_gzip (struct execdata *);
#endif

#ifdef	BFD

/* Check a section, updating the `locations' vector [BFD].  */
static void
check_section (bfd *bfd, asection *sec, void *userdata)
{
  struct execdata *u = userdata;
  vm_address_t addr;
  static const union
    {
      char string[8];
      unsigned int quadword __attribute__ ((mode (DI)));
    } interp = { string: ".interp" };

  if (u->error)
    return;

  /* Fast strcmp for this 8-byte constant string.  */
  if (*(const __typeof (interp.quadword) *) sec->name == interp.quadword)
    u->interp.section = sec;

  if (!(sec->flags & (SEC_ALLOC|SEC_LOAD)) ||
      (sec->flags & SEC_NEVER_LOAD))
    /* Nothing to do for this section.  */
    return;

  addr = (vm_address_t) sec->vma;

  if (sec->flags & SEC_LOAD)
    {
      u->info.bfd_locations[sec->index] = sec->filepos;
      if ((off_t) sec->filepos < 0 || (off_t) sec->filepos > u->file_size)
	u->error = EINVAL;
    }
}
#endif


/* Load or allocate a section.  */
static void
load_section (void *section, struct execdata *u)
{
  vm_address_t addr = 0;
  vm_offset_t filepos = 0;
  vm_size_t filesz = 0, memsz = 0;
  vm_prot_t vm_prot;
  int anywhere;
  vm_address_t mask = 0;
#ifdef BFD
  asection *const sec = section;
#endif
  const Elf32_Phdr *const ph = section;

  if (u->error)
    return;

#ifdef BFD
  if (u->bfd && sec->flags & SEC_NEVER_LOAD)
    /* Nothing to do for this section.  */
    return;
#endif

  vm_prot = VM_PROT_READ | VM_PROT_WRITE | VM_PROT_EXECUTE;

#ifdef	BFD
  if (u->bfd)
    {
      addr = (vm_address_t) sec->vma;
      filepos = u->info.bfd_locations[sec->index];
      memsz = sec->_raw_size;
      filesz = (sec->flags & SEC_LOAD) ? memsz : 0;
      if (sec->flags & (SEC_READONLY|SEC_ROM))
	vm_prot &= ~VM_PROT_WRITE;
      anywhere = 0;
    }
  else
#endif
    {
      addr = ph->p_vaddr & ~(ph->p_align - 1);
      memsz = ph->p_vaddr + ph->p_memsz - addr;
      filepos = ph->p_offset & ~(ph->p_align - 1);
      filesz = ph->p_offset + ph->p_filesz - filepos;
      if ((ph->p_flags & PF_R) == 0)
	vm_prot &= ~VM_PROT_READ;
      if ((ph->p_flags & PF_W) == 0)
	vm_prot &= ~VM_PROT_WRITE;
      if ((ph->p_flags & PF_X) == 0)
	vm_prot &= ~VM_PROT_EXECUTE;
      anywhere = u->info.elf.anywhere;
      if (! anywhere)
	addr += u->info.elf.loadbase;
      else
	switch (elf_machine)
	  {
	  case EM_386:
	  case EM_486:
	    /* On the i386, programs normally load at 0x08000000, and
	       expect their data segment to be able to grow dynamically
	       upward from its start near that address.  We need to make
	       sure that the dynamic linker is not mapped in a conflicting
	       address.  */
	    /* mask = 0xf8000000UL; */ /* XXX */
	    break;
	  default:
	    break;
	  }
    }

  if (memsz == 0)
    /* This section is empty; ignore it.  */
    return;

  if (filesz != 0)
    {
      vm_address_t mapstart = round_page (addr);

      /* Allocate space in the task and write CONTENTS into it.  */
      void write_to_task (vm_address_t mapstart, vm_size_t size,
			  vm_prot_t vm_prot, vm_address_t contents)
	{
	  vm_size_t off = size % vm_page_size;
	  /* Allocate with vm_map to set max protections.  */
	  u->error = vm_map (u->task,
			     &mapstart, size, mask, anywhere,
			     MACH_PORT_NULL, 0, 1,
			     vm_prot|VM_PROT_WRITE,
			     VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE,
			     VM_INHERIT_COPY);
	  if (! u->error && size >= vm_page_size)
	    u->error = vm_write (u->task, mapstart, contents, size - off);
	  if (! u->error && off != 0)
	    {
	      vm_address_t page = 0;
	      u->error = vm_allocate (mach_task_self (),
				      &page, vm_page_size, 1);
	      if (! u->error)
		{
		  memcpy ((void *) page,
			  (void *) (contents + (size - off)),
			  off);
		  u->error = vm_write (u->task, mapstart + (size - off),
				       page, vm_page_size);
		  vm_deallocate (mach_task_self (), page, vm_page_size);
		}
	    }
	  /* Reset the current protections to the desired state.  */
	  if (! u->error && (vm_prot & VM_PROT_WRITE) == 0)
	    u->error = vm_protect (u->task, mapstart, size, 0, vm_prot);
	}

      if (mapstart - addr < filesz)
	{
	  /* MAPSTART is the first page that starts inside the section.
	     Map all the pages that start inside the section.  */

#define SECTION_IN_MEMORY_P	(u->file_data != NULL)
#define SECTION_CONTENTS	(u->file_data + filepos)
	  if (SECTION_IN_MEMORY_P)
	    /* Data is already in memory; write it into the task.  */
	    write_to_task (mapstart, filesz - (mapstart - addr), vm_prot,
			   (vm_address_t) SECTION_CONTENTS
			   + (mapstart - addr));
	  else if (u->filemap != MACH_PORT_NULL)
	    /* Map the data into the task directly from the file.  */
	    u->error = vm_map (u->task,
			       &mapstart, filesz - (mapstart - addr),
			       mask, anywhere,
			       u->filemap, filepos + (mapstart - addr), 1, 
			       vm_prot,
			       VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE,
			       VM_INHERIT_COPY);
	  else
	    {
	      /* Cannot map the data.  Read it into a buffer and vm_write
		 it into the task.  */
	      void *buf;
	      const vm_size_t size = filesz - (mapstart - addr);
	      u->error = vm_allocate (mach_task_self (),
				      (vm_address_t *) &buf, size, 1);
	      if (! u->error)
		{
		  if (fseek (&u->stream,
			     filepos + (mapstart - addr), SEEK_SET) ||
		      fread (buf, size, 1, &u->stream) != 1)
		    u->error = errno;
		  else
		    write_to_task (mapstart, size, vm_prot,
				   (vm_address_t) buf);
		  vm_deallocate (mach_task_self (), (vm_address_t) buf, size);
		}
	    }
	  if (u->error)
	    return;

	  if (anywhere)
	    {
	      /* We let the kernel choose the location of the mapping.
		 Now record where it ended up.  Later sections cannot
		 be mapped anywhere, they must come after this one.  */
	      u->info.elf.loadbase = mapstart;
	      addr = mapstart + (addr % vm_page_size);
	      anywhere = u->info.elf.anywhere = 0;
	      mask = 0;
	    }
	}

      if (mapstart > addr)
	{
	  /* We must read and copy in the space in the section before the
             first page boundary.  */
	  vm_address_t overlap_page = trunc_page (addr);
	  vm_address_t ourpage = 0;
	  vm_size_t size = 0;
	  void *readaddr;
	  size_t readsize;

	  u->error = vm_read (u->task, overlap_page, vm_page_size,
			      &ourpage, &size);
	  if (u->error)
	    {
	      if (u->error == KERN_INVALID_ADDRESS)
		{
		  /* The space is unallocated.  */
		  u->error = vm_allocate (u->task,
					  &overlap_page, vm_page_size, 0);
		  size = vm_page_size;
		  if (!u->error)
		    u->error = vm_allocate (mach_task_self (),
					    &ourpage, vm_page_size, 1);
		}
	      if (u->error)
		{
		maplose:
		  vm_deallocate (u->task, mapstart, filesz);
		  return;
		}
	    }

	  readaddr = (void *) (ourpage + (addr - overlap_page));
	  readsize = size - (addr - overlap_page);
	  if (readsize > filesz)
	    readsize = filesz;

	  if (SECTION_IN_MEMORY_P)
	    bcopy (SECTION_CONTENTS, readaddr, readsize);
	  else
	    if (fseek (&u->stream, filepos, SEEK_SET) ||
		fread (readaddr, readsize, 1, &u->stream) != 1)
	      {
		u->error = errno;
		goto maplose;
	      }
	  u->error = vm_write (u->task, overlap_page, ourpage, size);
	  if (u->error == KERN_PROTECTION_FAILURE)
	    {
	      /* The overlap page is not writable; the section
		 that appears in preceding memory is read-only.
		 Change the page's protection so we can write it.  */
	      u->error = vm_protect (u->task, overlap_page, size,
				     0, vm_prot | VM_PROT_WRITE);
	      if (!u->error)
		u->error = vm_write (u->task, overlap_page, ourpage, size);
	      /* If this section is not supposed to be writable either,
		 restore the page's protection to read-only.  */
	      if (!u->error && !(vm_prot & VM_PROT_WRITE))
		u->error = vm_protect (u->task, overlap_page, size,
				       0, vm_prot);
	    }
	  vm_deallocate (mach_task_self (), ourpage, size);
	  if (u->error)
	    goto maplose;
	}

      if (u->cntl)
	u->cntl->accessed = 1;

      /* Tell the code below to zero-fill the remaining area.  */
      addr += filesz;
      memsz -= filesz;
    }

  if (memsz != 0)
    {
      /* SEC_ALLOC: Allocate zero-filled memory for the section.  */

      vm_address_t mapstart = round_page (addr);

      if (mapstart - addr < memsz)
	{
	  /* MAPSTART is the first page that starts inside the section.
	     Allocate all the pages that start inside the section.  */
	  u->error = vm_map (u->task, &mapstart, memsz - (mapstart - addr),
			     mask, anywhere, MACH_PORT_NULL, 0, 1,
			     vm_prot, VM_PROT_ALL, VM_INHERIT_COPY);
	  if (u->error)
	    return;
	}

      if (anywhere)
	{
	  /* We let the kernel choose the location of the zero space.
	     Now record where it ended up.  Later sections cannot
	     be mapped anywhere, they must come after this one.  */
	  u->info.elf.loadbase = mapstart;
	  addr = mapstart + (addr % vm_page_size);
	  anywhere = u->info.elf.anywhere = 0;
	  mask = 0;
	}

      if (mapstart > addr)
	{
	  /* Zero space in the section before the first page boundary.  */
	  vm_address_t overlap_page = trunc_page (addr);
	  vm_address_t ourpage = 0;
	  vm_size_t size = 0;
	  u->error = vm_read (u->task, overlap_page, vm_page_size,
			      &ourpage, &size);
	  if (u->error)
	    {
	      vm_deallocate (u->task, mapstart, memsz);
	      return;
	    }
	  bzero ((void *) (ourpage + (addr - overlap_page)),
		 size - (addr - overlap_page));
	  if (!(vm_prot & VM_PROT_WRITE))
	    u->error = vm_protect (u->task, overlap_page, size,
				   0, VM_PROT_WRITE);
	  if (! u->error)
	    u->error = vm_write (u->task, overlap_page, ourpage, size);
	  if (! u->error && !(vm_prot & VM_PROT_WRITE))
	    u->error = vm_protect (u->task, overlap_page, size, 0, vm_prot);
	  vm_deallocate (mach_task_self (), ourpage, size);
	}
    }
}

/* Make sure our mapping window (or read buffer) covers
   LEN bytes of the file starting at POSN.  */

static void *
map (struct execdata *e, off_t posn, size_t len)
{
  FILE *f = &e->stream;
  const size_t size = e->file_size;
  size_t offset = 0;

  f->__target = posn;

  if (e->filemap == MACH_PORT_NULL)
    {
      char *buffer = f->__buffer;
      mach_msg_type_number_t nread = f->__bufsize;
      while (nread < len)
	nread += __vm_page_size;
      e->error = io_read (e->file, &buffer, &nread,
			  f->__target, e->optimal_block);
      if (e->error)
	{
	  errno = e->error;
	  f->__error = 1;
	  return NULL;
	}
      if (buffer != f->__buffer)
	{
	  /* The data was returned out of line.  Discard the old buffer.  */
	  vm_deallocate (mach_task_self (), (vm_address_t) f->__buffer,
			 f->__bufsize);
	  f->__buffer = buffer;
	  f->__bufsize = round_page (nread);
	}

      f->__get_limit = f->__buffer + nread;

      if (nread < len)
	{
	  f->__eof = 1;
	  return NULL;
	}
    }
  else
    {
      /* Deallocate the old mapping area.  */
      if (f->__buffer != NULL)
	vm_deallocate (mach_task_self (), (vm_address_t) f->__buffer,
		       f->__bufsize);
      f->__buffer = NULL;

      /* Make sure our mapping is page-aligned in the file.  */
      offset = f->__target % vm_page_size;
      if (offset != 0)
	f->__target -= offset;
      f->__bufsize = round_page (posn + len) - f->__target;

      /* Map the data from the file.  */
      if (vm_map (mach_task_self (),
		  (vm_address_t *) &f->__buffer, f->__bufsize, 0, 1,
		  e->filemap, f->__target, 1, VM_PROT_READ, VM_PROT_READ,
		  VM_INHERIT_NONE))
	{
	  errno = e->error = EIO;
	  f->__error = 1;
	  return NULL;
	}

      if (e->cntl)
	e->cntl->accessed = 1;

      if (f->__target + f->__bufsize > size)
	f->__get_limit = f->__buffer + (size - f->__target);
      else
	f->__get_limit = f->__buffer + f->__bufsize;
    }

  f->__offset = f->__target;
  f->__bufp = f->__buffer + offset;

  if (f->__bufp + len >= f->__get_limit)
    {
      f->__eof = 1;
      return NULL;
    }

  return f->__bufp;
}

/* stdio input-room function.  */
static int
input_room (FILE *f)
{
  struct execdata *e = f->__cookie;
  if (f->__target >= e->file_size)
    {
      f->__eof = 1;
      return EOF;
    }

  return (map (e, f->__target, 1) == NULL ? EOF :
	  (unsigned char) *f->__bufp++);
}

static int
close_exec_stream (void *cookie)
{
  struct execdata *e = cookie;

  if (e->stream.__buffer != NULL)
    vm_deallocate (mach_task_self (), (vm_address_t) e->stream.__buffer,
		   e->stream.__bufsize);

  return 0;
}


/* Prepare to check and load FILE.  */
static void
prepare (file_t file, struct execdata *e)
{
  e->file = file;

#ifdef	BFD
  e->bfd = NULL;
#endif
  e->file_data = NULL;
  e->cntl = NULL;
  e->filemap = MACH_PORT_NULL;
  e->cntlmap = MACH_PORT_NULL;

  {
    memory_object_t rd, wr;
    e->error = io_map (file, &rd, &wr);
    if (e->error)
      return;
    if (wr != MACH_PORT_NULL)
      mach_port_deallocate (mach_task_self (), wr);
    if (rd == MACH_PORT_NULL)
      {
	e->error = EBADF;	/* ? XXX */
	return;
      }
    e->filemap = rd;

    e->error = /* io_map_cntl (file, &e->cntlmap) */ EOPNOTSUPP; /* XXX */
    if (e->error)
      {
	/* No shared page.  Do a stat to find the file size.  */
	struct stat st;
	e->error = io_stat (file, &st);
	if (e->error)
	  return;
	e->file_size = st.st_size;
	e->optimal_block = st.st_blksize;
      }
    else
      e->error = vm_map (mach_task_self (), (vm_address_t *) &e->cntl,
			 vm_page_size, 0, 1, e->cntlmap, 0, 0,
			 VM_PROT_READ|VM_PROT_WRITE, 
			 VM_PROT_READ|VM_PROT_WRITE, VM_INHERIT_NONE);

    if (e->cntl)
      while (1)
	{
	  spin_lock (&e->cntl->lock);
	  switch (e->cntl->conch_status)
	    {
	    case USER_COULD_HAVE_CONCH:
	      e->cntl->conch_status = USER_HAS_CONCH;
	    case USER_HAS_CONCH:
	      spin_unlock (&e->cntl->lock);
	      /* Break out of the loop.  */
	      break;
	    case USER_RELEASE_CONCH:
	    case USER_HAS_NOT_CONCH:
	    default:		/* Oops.  */
	      spin_unlock (&e->cntl->lock);
	      e->error = io_get_conch (e->file);
	      if (e->error)
		return;
	      /* Continue the loop.  */
	      continue;
	    }

	  /* Get here if we are now IT.  */
	  e->file_size = 0;
	  if (e->cntl->use_file_size)
	    e->file_size = e->cntl->file_size;
	  if (e->cntl->use_read_size && e->cntl->read_size > e->file_size)
	    e->file_size = e->cntl->read_size;
	  break;
	}
  }

  /* Open a stdio stream to do mapped i/o to the file.  */
  memset (&e->stream, 0, sizeof (e->stream));
  e->stream.__magic = _IOMAGIC;
  e->stream.__mode.__read = 1;
  e->stream.__userbuf = 1;
  e->stream.__room_funcs.__input = input_room;
  /* This never gets called, but fseek returns ESPIPE if it's null.  */
  e->stream.__io_funcs.seek = __default_io_functions.seek;
  e->stream.__io_funcs.close = close_exec_stream;
  e->stream.__cookie = e;
  e->stream.__seen = 1;

  e->interp.section = NULL;
}

/* Check the magic number, etc. of the file.
   On successful return, the caller must allocate the
   E->locations vector, and map check_section over the BFD.  */

#ifdef BFD
static void
check_bfd (struct execdata *e)
{
  bfd_set_error (bfd_error_no_error);

  e->bfd = bfd_openstreamr (NULL, NULL, &e->stream);
  if (e->bfd == NULL)
    {
      e->error = b2he (ENOEXEC);
      return;
    }

  if (!bfd_check_format (e->bfd, bfd_object))
    {
      e->error = b2he (ENOEXEC);
      return;
    }
  else if (/* !(e->bfd->flags & EXEC_P) || XXX */
	   (host_bfd.arch_info->compatible = e->bfd->arch_info->compatible,
	    bfd_arch_get_compatible (&host_bfd, e->bfd)) != host_bfd.arch_info)
    {
      /* This file is of a recognized binary file format, but it is not
	 executable on this machine.  */
      e->error = b2he (EINVAL);
      return;
    }

  e->entry = e->bfd->start_address;
}
#endif

#include <endian.h>
#if BYTE_ORDER == BIG_ENDIAN
#define host_ELFDATA ELFDATA2MSB
#endif
#if BYTE_ORDER == LITTLE_ENDIAN
#define host_ELFDATA ELFDATA2LSB
#endif

static void
check_elf (struct execdata *e)
{
  Elf32_Ehdr *ehdr = map (e, 0, sizeof (Elf32_Ehdr));
  Elf32_Phdr *phdr;

  if (! ehdr)
    {
      if (! ferror (&e->stream))
	e->error = ENOEXEC;
      return;
    }

  if (*(Elf32_Word *) ehdr != ((union { Elf32_Word word;
				       unsigned char string[SELFMAG]; })
			       { string: ELFMAG }).word)
    {
      e->error = ENOEXEC;
      return;
    }

  if (ehdr->e_ident[EI_CLASS] != ELFCLASS32 ||
      ehdr->e_ident[EI_DATA] != host_ELFDATA ||
      ehdr->e_ident[EI_VERSION] != EV_CURRENT ||
      ehdr->e_version != EV_CURRENT ||
      ehdr->e_machine != elf_machine ||
      ehdr->e_ehsize < sizeof *ehdr ||
      ehdr->e_phentsize != sizeof (Elf32_Phdr))
    {
      e->error = EINVAL;
      return;
    }

  e->entry = ehdr->e_entry;
  e->info.elf.phnum = ehdr->e_phnum;
  phdr = map (e, ehdr->e_phoff, ehdr->e_phnum * sizeof (Elf32_Phdr));
  if (! phdr)
    {
      if (! ferror (&e->stream))
	e->error = EINVAL;
      return;
    }
  e->info.elf.phdr = phdr;

  e->info.elf.anywhere = (ehdr->e_type == ET_DYN ||
			  ehdr->e_type == ET_REL);
  e->info.elf.loadbase = 0;
}

static void
check_elf_phdr (struct execdata *e, const Elf32_Phdr *mapped_phdr,
		vm_address_t *phdr_addr, vm_size_t *phdr_size)
{
  const Elf32_Phdr *phdr;

  memcpy (e->info.elf.phdr, mapped_phdr,
	  e->info.elf.phnum * sizeof (Elf32_Phdr));

  for (phdr = e->info.elf.phdr;
       phdr < &e->info.elf.phdr[e->info.elf.phnum];
       ++phdr)
    switch (phdr->p_type)
      {
      case PT_INTERP:
	e->interp.phdr = phdr;
	break;
      case PT_PHDR:
	if (phdr_addr)
	  *phdr_addr = phdr->p_vaddr & ~(phdr->p_align - 1);
	if (phdr_size)
	  *phdr_size = phdr->p_memsz;
	break;
      case PT_LOAD:
	/* Sanity check.  */
	if (e->file_size <= (off_t) (phdr->p_offset +
				     phdr->p_filesz))
	  e->error = EINVAL;
	break;
      }	      
}


static void
check (struct execdata *e)
{
  check_elf (e);
#ifdef BFD
  if (e->error == ENOEXEC)
    {
      e->error = 0;
      check_bfd (e);
    }
#endif
}


/* Release the conch and clean up mapping the file and control page.  */
static void
finish_mapping (struct execdata *e)
{
  if (e->cntl != NULL)
    {
      spin_lock (&e->cntl->lock);
      if (e->cntl->conch_status == USER_RELEASE_CONCH)
	{
	  spin_unlock (&e->cntl->lock);
	  io_release_conch (e->file);
	}
      else
	{
	  e->cntl->conch_status = USER_HAS_NOT_CONCH;
	  spin_unlock (&e->cntl->lock);
	}
      vm_deallocate (mach_task_self (), (vm_address_t) e->cntl, vm_page_size);
      e->cntl = NULL;
    }
  if (e->filemap != MACH_PORT_NULL)
    {
      mach_port_deallocate (mach_task_self (), e->filemap);
      e->filemap = MACH_PORT_NULL;
    }
  if (e->cntlmap != MACH_PORT_NULL)
    {
      mach_port_deallocate (mach_task_self (), e->cntlmap);
      e->cntlmap = MACH_PORT_NULL;
    }
}
      
/* Clean up after reading the file (need not be completed).  */
void
finish (struct execdata *e, int dealloc_file)
{
  finish_mapping (e);
#ifdef	BFD
  if (e->bfd != NULL)
    {
      bfd_close (e->bfd);
      e->bfd = NULL;
    }
  else
#endif
    fclose (&e->stream);
  if (dealloc_file && e->file != MACH_PORT_NULL)
    {
      mach_port_deallocate (mach_task_self (), e->file);
      e->file = MACH_PORT_NULL;
    }
}


/* Load the file.  */
static void
load (task_t usertask, struct execdata *e)
{
  e->task = usertask;

  if (! e->error)
    {
#ifdef	BFD
      if (e->bfd)
	{
	  void load_bfd_section (bfd *bfd, asection *sec, void *userdata)
	    {
	      load_section (sec, userdata);
	    }
	  bfd_map_over_sections (e->bfd, &load_bfd_section, e);
	}
      else
#endif
	{
	  Elf32_Word i;
	  for (i = 0; i < e->info.elf.phnum; ++i)
	    if (e->info.elf.phdr[i].p_type == PT_LOAD)
	      load_section (&e->info.elf.phdr[i], e);

	  /* The entry point address is relative to whereever we loaded the
	     program text.  */
	  e->entry += e->info.elf.loadbase;
	}
    }

  /* Release the conch for the file.  */
  finish_mapping (e);

  if (! e->error)
    {
      /* Do post-loading processing on the task.  */

#ifdef	BFD
      if (e->bfd)
	{
	  /* Do post-loading processing for a section.  This consists of
	     peeking the pages of non-demand-paged executables.  */

	  void postload_section (bfd *bfd, asection *sec, void *userdata)
	    {
	      struct execdata *u = userdata;
	      vm_address_t addr = 0;
	      vm_size_t secsize = 0;

	      addr = (vm_address_t) sec->vma;
	      secsize = sec->_raw_size;

	      if ((sec->flags & SEC_LOAD) && !(bfd->flags & D_PAGED))
		{
		  /* Pre-load the section by peeking every mapped page.  */
		  vm_address_t myaddr, a;
		  vm_size_t mysize;
		  myaddr = 0;
	  
		  /* We have already mapped the file into the task in
		     load_section.  Now read from the task's memory into our
		     own address space so we can peek each page and cause it to
		     be paged in.  */
		  u->error = vm_read (u->task, trunc_page (addr), 
				      round_page (secsize), &myaddr, &mysize);
		  if (u->error)
		    return;

		  /* Peek at the first word of each page.  */
		  for (a = ((myaddr + mysize) & ~(vm_page_size - 1));
		       a >= myaddr; a -= vm_page_size)
		    /* Force it to be paged in.  */
		    (void) *(volatile int *) a;

		  vm_deallocate (mach_task_self (), myaddr, mysize);
		}
	    }

	  bfd_map_over_sections (e->bfd, postload_section, e);
	}
#endif
    }
}

#ifdef GZIP
/* Check the file for being a gzip'd image.  Return with ENOEXEC means not
   a valid gzip file; return with another error means lossage in decoding;
   return with zero means the file was uncompressed into memory which E now
   points to, and `check' can be run again.  */

static void
check_gzip (struct execdata *earg)
{
  struct execdata *e = earg;
  /* Entry points to unzip engine.  */
  int get_method (int);
  void unzip (int, int);
  extern long int bytes_out;
  /* Callbacks from unzip for I/O and error interface.  */
  extern int (*unzip_read) (char *buf, size_t maxread);
  extern void (*unzip_write) (const char *buf, size_t nwrite);
  extern void (*unzip_read_error) (void);
  extern void (*unzip_error) (const char *msg);

  char *zipdata = NULL;
  size_t zipdatasz = 0;
  FILE *zipout = NULL;
  jmp_buf ziperr;
  int zipread (char *buf, size_t maxread)
    {
      return fread (buf, 1, maxread, &e->stream);
    }
  void zipwrite (const char *buf, size_t nwrite)
    {
      if (fwrite (buf, nwrite, 1, zipout) != 1)
	longjmp (ziperr, 1);
    }
  void ziprderr (void)
    {
      longjmp (ziperr, 2);
    }
  void ziperror (const char *msg)
    {
      errno = ENOEXEC;
      longjmp (ziperr, 2);
    }

  unzip_read = zipread;
  unzip_write = zipwrite;
  unzip_read_error = ziprderr;
  unzip_error = ziperror;

  if (setjmp (ziperr))
    {
      /* Error in unzipping jumped out.  */
      if (zipout)
	{
	  fclose (zipout);
	  free (zipdata);
	}
      e->error = errno;
      return;
    }

  rewind (&e->stream);
  if (get_method (0) != 0)
    {
      /* Not a happy gzip file.  */
      e->error = ENOEXEC;
      return;
    }

  /* Matched gzip magic number.  Ready to unzip.
     Set up the output stream and let 'er rip.  */

  zipout = open_memstream (&zipdata, &zipdatasz);
  if (! zipout)
    {
      e->error = errno;
      return;
    }

  /* Call the gunzip engine.  */
  bytes_out = 0;
  unzip (17, 23);		/* Arguments ignored.  */

  /* The output is complete.  Clean up the stream and store its resultant
     buffer and size in the execdata as the file contents.  */
  fclose (zipout);
  e->file_data = zipdata;
  e->file_size = zipdatasz;

  /* Clean up the old exec file stream's state.  */
  finish (e, 0);

  /* Point the stream at the buffer of file data.  */
  memset (&e->stream, 0, sizeof (e->stream));
  e->stream.__magic = _IOMAGIC;
  e->stream.__mode.__read = 1;
  e->stream.__buffer = e->file_data;
  e->stream.__bufsize = e->file_size;
  e->stream.__get_limit = e->stream.__buffer + e->stream.__bufsize;
  e->stream.__bufp = e->stream.__buffer;
  e->stream.__seen = 1;
}
#endif


static inline error_t
servercopy (void **arg, u_int argsize, boolean_t argcopy)
{
  if (argcopy)
    {
      /* ARG came in-line, so we must copy it.  */
      error_t error;
      void *copy;
      error = vm_allocate (mach_task_self (),
			   (vm_address_t *) &copy, argsize, 1);
      if (error)
	return error;
      bcopy (*arg, copy, argsize);
      *arg = copy;
    }
  return 0;
}


static error_t
do_exec (file_t file,
	 task_t oldtask,
	 int flags,
	 char *argv, u_int argvlen, boolean_t argv_copy,
	 char *envp, u_int envplen, boolean_t envp_copy,
	 mach_port_t *dtable, u_int dtablesize, boolean_t dtable_copy,
	 mach_port_t *portarray, u_int nports, boolean_t portarray_copy,
	 int *intarray, u_int nints, boolean_t intarray_copy,
	 mach_port_t *deallocnames, u_int ndeallocnames,
	 mach_port_t *destroynames, u_int ndestroynames)
{
  struct execdata e, interp;
  task_t newtask = MACH_PORT_NULL;
  thread_t thread = MACH_PORT_NULL;
  struct bootinfo *boot = 0;
  int *ports_replaced;
  int secure, defaults;
  vm_address_t phdr_addr = 0;
  vm_size_t phdr_size = 0;
  u_int i;
  
  /* Prime E for executing FILE and check its validity.  This must be an
     inline function because it stores pointers into alloca'd storage in E
     for later use in `load'.  */
  void prepare_and_check (file_t file, struct execdata *e)
    {
      /* Prepare E to read the file.  */
      prepare (file, e);

      /* Check the file for validity first.  */

      check (e);

#ifdef GZIP
      if (e->error == ENOEXEC)
	{
	  /* See if it is a compressed image.  */
	  static struct mutex lock = MUTEX_INITIALIZER;
	  /* The gzip code is really cheesy, not even close to thread-safe.
	     So we serialize all uses of it.  */
	  mutex_lock (&lock);
	  check_gzip (e);
	  mutex_unlock (&lock);
	  if (e->error == 0)
	    /* The file was uncompressed into memory, and now E describes the
	       uncompressed image rather than the actual file.  Check it again
	       for a valid magic number.  */
	    check (e);
	}
#endif
    }


  /* Here is the main body of the function.  */


  /* Catch this error now, rather than later.  */
  /* XXX For EXEC_DEFAULTS, this is only an error if one of the user's
     ports is null; if they are all provided, then EXEC_DEFAULTS would
     have no effect, and the lack of installed standard ports should
     not cause an error.  -mib */
  if ((!std_ports || !std_ints) && (flags & (EXEC_SECURE|EXEC_DEFAULTS)))
    return EIEIO;

  /* Suspend the existing task before frobnicating it.  */
  if (oldtask != MACH_PORT_NULL && (e.error = task_suspend (oldtask)))
    return e.error;

  /* Prime E for executing FILE and check its validity.  */
  prepare_and_check (file, &e);

  if (e.error == ENOEXEC)
    {
      /* Check for a #! executable file.  */
      check_hashbang (&e,
		      file, oldtask, flags,
		      argv, argvlen, argv_copy,
		      envp, envplen, envp_copy,
		      dtable, dtablesize, dtable_copy,
		      portarray, nports, portarray_copy,
		      intarray, nints, intarray_copy,
		      deallocnames, ndeallocnames,
		      destroynames, ndestroynames);
      if (! e.error)
	/* The #! exec succeeded; nothing more to do.  */
	return 0;
    }

  if (e.error)
    /* The file is not a valid executable.  */
    goto out;

#ifdef	BFD
  if (e.bfd)
    {
      e.info.bfd_locations = alloca (e.bfd->section_count *
				     sizeof (vm_offset_t));
      bfd_map_over_sections (e.bfd, check_section, &e);
    }
  else
#endif
    {
      const Elf32_Phdr *phdr = e.info.elf.phdr;
      e.info.elf.phdr = alloca (e.info.elf.phnum * sizeof (Elf32_Phdr));
      check_elf_phdr (&e, phdr, &phdr_addr, &phdr_size);
    }

  interp.file = MACH_PORT_NULL;

  if (oldtask == MACH_PORT_NULL)
    flags |= EXEC_NEWTASK;

  if (flags & (EXEC_NEWTASK|EXEC_SECURE))
    {
      /* Create the new task.  If we are not being secure, then use OLDTASK
	 for the task_create RPC, in case it is something magical.  */	 
      e.error = task_create (((flags & EXEC_SECURE) ||
			      oldtask == MACH_PORT_NULL) ?
			     mach_task_self () : oldtask,
			     0, &newtask);
      if (e.error)
	goto out;
    }
  else
    newtask = oldtask;


  rwlock_reader_lock (&std_lock);
  {
    /* Store the data that we will give in response
       to the RPC on the new task's bootstrap port.  */

    /* Set boot->portarray[IDX] to NEW.  If REAUTH is nonzero,
       io_reauthenticate NEW and set it to the authenticated port.
       If CONSUME is nonzero, a reference on NEW is consumed;
       it is invalid to give nonzero values to both REAUTH and CONSUME.  */
#define use(idx, new, reauth, consume) \
  do { use1 (idx, new, reauth, consume); \
       if (e.error) goto stdout; } while (0)
    void use1 (unsigned int idx, mach_port_t new,
	       int reauth, int consume)
      {
	if (new != MACH_PORT_NULL && reauth)
	  {
	    mach_port_t ref = mach_reply_port (), authed;
	    e.error = io_reauthenticate (new, ref, MACH_MSG_TYPE_MAKE_SEND);
	    if (! e.error)
	      e.error = auth_user_authenticate
		(boot->portarray[INIT_PORT_AUTH], 
		 new, ref, MACH_MSG_TYPE_MAKE_SEND, &authed);
	    mach_port_destroy (mach_task_self (), ref);
	    if (e.error)
	      return;
	    new = authed;
	  }
	else
	  {
	    if (!consume && new != MACH_PORT_NULL)
	      mach_port_mod_refs (mach_task_self (),
				  new, MACH_PORT_RIGHT_SEND, 1);
	  }
	
	boot->portarray[idx] = new;
	ports_replaced[idx] = 1;
      }

    boot = ports_allocate_port (port_bucket, sizeof *boot, execboot_portclass);
    if (boot == NULL)
      {
	e.error = ENOMEM;
      stdout:
	rwlock_reader_unlock (&std_lock);
	goto out;
      }
    bzero (&boot->pi + 1, (char *) &boot[1] - (char *) (&boot->pi + 1));

    /* First record some information about the image itself.  */
    boot->phdr_addr = phdr_addr;
    boot->phdr_size = phdr_size;
    boot->user_entry = e.entry;

    /* These flags say the information we pass through to the new program
       may need to be modified.  */
    secure = (flags & EXEC_SECURE);
    defaults = (flags & EXEC_DEFAULTS);

    /* Now record the big blocks of data we shuffle around unchanged.
       Whatever arrived inline, we must allocate space for so it can
       survive after this RPC returns.  */

    boot->flags = flags;

    e.error = servercopy ((void **) &argv, argvlen, argv_copy);
    if (e.error)
      goto stdout;
    boot->argv = argv;
    boot->argvlen = argvlen;
    e.error = servercopy ((void **) &envp, envplen, envp_copy);
    if (e.error)
      goto stdout;
    boot->envp = envp;
    boot->envplen = envplen;
    e.error = servercopy ((void **) &dtable, dtablesize * sizeof (mach_port_t),
			  dtable_copy);
    if (e.error)
      goto stdout;
    boot->dtable = dtable;
    boot->dtablesize = dtablesize;

    if ((secure || defaults) && nints < INIT_INT_MAX)
      {
	/* Make sure the intarray is at least big enough.  */
	if (intarray_copy || (round_page (nints * sizeof (int)) <
			      round_page (INIT_INT_MAX * sizeof (int))))
	  {
	    /* Allocate a new vector that is big enough.  */
	    vm_allocate (mach_task_self (),
			 (vm_address_t *) &boot->intarray,
			 INIT_INT_MAX * sizeof (int),
			 1);
	    memcpy (boot->intarray, intarray, nints * sizeof (int));
	  }
	boot->nints = INIT_INT_MAX;
      }
    else
      {
	e.error = servercopy ((void **) &intarray, nints * sizeof (int),
			      intarray_copy);
	if (e.error)
	  goto stdout;
	boot->intarray = intarray;
	boot->nints = nints;
      }

    if (secure)
      boot->intarray[INIT_UMASK] = std_ints ? std_ints[INIT_UMASK] : CMASK;

    /* Now choose the ports to give the new program.  */

    boot->nports = nports < INIT_PORT_MAX ? INIT_PORT_MAX : nports;
    vm_allocate (mach_task_self (),
		 (vm_address_t *) &boot->portarray,
		 boot->nports * sizeof (mach_port_t), 1);
    /* Start by copying the array as passed.  */
    for (i = 0; i < nports; ++i)
      boot->portarray[i] = portarray[i];
    if (MACH_PORT_NULL != 0)
      for (; i < boot->nports; ++i)
	boot->portarray[i] = MACH_PORT_NULL;
    /* Keep track of which ports in BOOT->portarray come from the original
       PORTARRAY, and which we replace.  */
    ports_replaced = alloca (boot->nports * sizeof *ports_replaced);
    bzero (ports_replaced, boot->nports * sizeof *ports_replaced);

    if (portarray[INIT_PORT_BOOTSTRAP] == MACH_PORT_NULL &&
	oldtask != MACH_PORT_NULL)
      {
	if (! task_get_bootstrap_port (oldtask,
				       &boot->portarray[INIT_PORT_BOOTSTRAP]))
	  ports_replaced[INIT_PORT_BOOTSTRAP] = 1;
      }

    /* Note that the parentheses on this first test are different from the
       others below it. */
    if ((secure || defaults)
	&& boot->portarray[INIT_PORT_AUTH] == MACH_PORT_NULL)
      /* Q: Doesn't this let anyone run a program and make it
	 get a root auth port? 
	 A: No; the standard port for INIT_PORT_AUTH has no UID's at all.
	 See init.trim/init.c (init_stdarrays).  */
      use (INIT_PORT_AUTH, std_ports[INIT_PORT_AUTH], 0, 0);
    if (secure || (defaults 
		   && boot->portarray[INIT_PORT_PROC] == MACH_PORT_NULL))
      {
	/* Ask the proc server for the proc port for this task.  */
	mach_port_t new;
	e.error = proc_task2proc (procserver, newtask, &new);
	if (e.error)
	  goto stdout;

	use (INIT_PORT_PROC, new, 0, 1);

	/* XXX We should also call proc_setowner at this point. */
      }
    else if (oldtask != newtask && oldtask != MACH_PORT_NULL 
	     && boot->portarray[INIT_PORT_PROC] != MACH_PORT_NULL)
      {
	mach_port_t new;
	/* This task port refers to the old task; use it to fetch a new
	   one for the new task.  */
	e.error = proc_task2proc (boot->portarray[INIT_PORT_PROC], 
				  newtask, &new);
	if (e.error)
	  goto stdout;
	use (INIT_PORT_PROC, new, 0, 1);
      }
    if (secure || (defaults
		   && boot->portarray[INIT_PORT_CRDIR] == MACH_PORT_NULL))
      use (INIT_PORT_CRDIR, std_ports[INIT_PORT_CRDIR], 1, 0);
    if ((secure || defaults)
	&& boot->portarray[INIT_PORT_CWDIR] == MACH_PORT_NULL)
      use (INIT_PORT_CWDIR, std_ports[INIT_PORT_CWDIR], 1, 0);
  }  
  rwlock_reader_unlock (&std_lock);


  /* We have now concocted in BOOT the complete Hurd context (ports and
     ints) that the new program image will run under.  We will use these
     ports for looking up the interpreter file if there is one.  */

  if (! e.error && e.interp.section)
    {
      /* There is an interpreter section specifying another file to load
	 along with this executable.  Find the name of the file and open
	 it.  */

#ifdef BFD
      char namebuf[e.bfd ? e.interp.section->_raw_size : 0];
#endif
      char *name;

#ifdef BFD
      if (e.bfd)
	{
	  if (! bfd_get_section_contents (e.bfd, e.interp.section,
					  namebuf, 0,
					  e.interp.section->_raw_size))
	    {
	      e.error = b2he (errno);
	      name = NULL;
	    }
	  else
	    name = namebuf;
	}
      else
#endif
	{
	  name = map (&e, (e.interp.phdr->p_offset
			   & ~(e.interp.phdr->p_align - 1)),
		      e.interp.phdr->p_filesz);
	  if (! name && ! ferror (&e.stream))
	    e.error = EINVAL;
	}

      if (! name)
	e.interp.section = NULL;
      else
	{
	  /* Open the named file using the appropriate directory ports for
	     the user.  */
	  error_t user_port (int which, error_t (*operate) (mach_port_t))
	    {
	      return (*operate) (boot->nports > which ?
				 boot->portarray[which] :
				 MACH_PORT_NULL);
	    }
	  file_t user_fd (int fd)
	    {
	      if (fd < 0 || fd >= boot->dtablesize ||
		  boot->dtable[fd] == MACH_PORT_NULL)
		{
		  errno = EBADF;
		  return MACH_PORT_NULL;
		}
	      return boot->dtable[fd];
	    }
	  e.error = hurd_file_name_lookup (&user_port, &user_fd,
					   name, O_READ, 0, &interp.file);
	}
    }

  if (interp.file != MACH_PORT_NULL)
    {
      /* We opened an interpreter file.  Prepare it for loading too.  */
      prepare_and_check (interp.file, &interp);
      if (! interp.error)
	{
#ifdef	BFD
	  if (interp.bfd)
	    {
	      interp.info.bfd_locations = alloca (interp.bfd->section_count *
						  sizeof (vm_offset_t));
	      bfd_map_over_sections (interp.bfd, check_section, &e);
	    }
	  else
#endif
	    {
	      const Elf32_Phdr *phdr = interp.info.elf.phdr;
	      interp.info.elf.phdr = alloca (interp.info.elf.phnum *
					     sizeof (Elf32_Phdr));
	      check_elf_phdr (&interp, phdr, NULL, NULL);
	    }
	}
      e.error = interp.error;
    }

  if (e.error)
    goto out;


  /* We are now committed to the exec.  It "should not fail".
     If it does fail now, the task will be hopelessly munged.  */

  if (newtask == oldtask)
    {
      thread_array_t threads;
      mach_msg_type_number_t nthreads, i;

      /* Terminate all the threads of the old task.  */

      e.error = task_threads (oldtask, &threads, &nthreads);
      if (e.error)
	goto out;
      for (i = 0; i < nthreads; ++i)
	{
	  thread_terminate (threads[i]);
	  mach_port_deallocate (mach_task_self (), threads[i]);
	}
      vm_deallocate (mach_task_self (),
		     (vm_address_t) threads, nthreads * sizeof (thread_t));

      /* Deallocate the entire virtual address space of the task.  */

      vm_deallocate (oldtask,
		     VM_MIN_ADDRESS, VM_MAX_ADDRESS - VM_MIN_ADDRESS);

      /* Deallocate and destroy the ports requested by the caller.
	 These are ports the task wants not to lose if the exec call
	 fails, but wants removed from the new program task.  */

      for (i = 0; i < ndeallocnames; ++i)
	mach_port_deallocate (oldtask, deallocnames[i]);

      for (i = 0; i < ndestroynames; ++i)
	mach_port_destroy (oldtask, destroynames[i]);
    }
  
/* XXX this should be below
   it is here to work around a vm_map kernel bug. */
  if (interp.file != MACH_PORT_NULL)
    {
      /* Load the interpreter file.  */
      load (newtask, &interp);
      if (interp.error)
	{
	  e.error = interp.error;
	  goto out;
	}
      finish (&interp, 1);
    }


  /* Load the file into the task.  */
  load (newtask, &e);
  if (e.error)
    goto out;

  /* XXX loading of interp belongs here */

  /* Clean up.  */
  finish (&e, 0);

  /* Create the initial thread.  */
  e.error = thread_create (newtask, &thread);
  if (e.error)
    goto out;

  /* Start up the initial thread at the entry point.  */
  boot->stack_base = 0, boot->stack_size = 0; /* Don't care about values.  */
  e.error = mach_setup_thread (newtask, thread, 
			       (void *) (e.interp.section ? interp.entry :
					 e.entry),
			       &boot->stack_base, &boot->stack_size);
  if (e.error)
    goto out;

  if (oldtask != newtask && oldtask != MACH_PORT_NULL)
    {
      /* The program is on its way.  The old task can be nuked.  */
      process_t proc;
      process_t psrv;

      /* Use the canonical proc server if secure, or there is none other.
	 When not secure, it is nice to let processes associate with
	 whatever proc server turns them on, regardless of which exec
	 itself is using.  */
      if (secure
	  || boot->nports <= INIT_PORT_PROC
	  || boot->portarray[INIT_PORT_PROC] == MACH_PORT_NULL)
	psrv = procserver;
      else
	psrv = boot->portarray[INIT_PORT_PROC];

      /* XXX there is a race here for SIGKILLing the process. -roland
         I don't think it matters.  -mib */
      if (! proc_task2proc (psrv, oldtask, &proc))
	{
	  proc_reassign (proc, newtask);
	  mach_port_deallocate (mach_task_self (), proc);
	}

      mach_port_deallocate (mach_task_self (), oldtask);
    }

  {
    mach_port_t btport = ports_get_right (boot);
    mach_port_insert_right (mach_task_self (), btport, btport,
			    MACH_MSG_TYPE_MAKE_SEND);
    e.error = task_set_bootstrap_port (newtask, btport);
    mach_port_deallocate (mach_task_self (), btport);
  }

 out:
  if (e.interp.section)
    finish (&interp, 1);
  finish (&e, !e.error);

  if (boot)
    {
      /* Release the original reference.  Now there is only one
	 reference, which will be released on no-senders notification.
	 If we are bailing out due to error before setting the task's
	 bootstrap port, this will be the last reference and BOOT
	 will get cleaned up here.  */
      if (e.error)
	/* Kill the pointers to the argument information so the cleanup
	   of BOOT doesn't deallocate it.  It will be deallocated my MiG
	   when we return the error.  */
	bzero (&boot->pi + 1, (char *) &boot[1] - (char *) (&boot->pi + 1));
      ports_port_deref (boot);
    }

  if (thread != MACH_PORT_NULL)
    {
      thread_resume (thread);
      mach_port_deallocate (mach_task_self (), thread);
    }

  if (e.error)
    {
      if (oldtask != newtask)
	{
	  /* We created a new task but failed to set it up.  Kill it.  */
	  task_terminate (newtask);
	  mach_port_deallocate (mach_task_self (), newtask);
	}
      /* Resume the old task, which we suspended earlier.  */
      task_resume (oldtask);
    }
  else
    {
      if (oldtask != newtask)
	{
	  /* We successfully set the new task up.
	     Terminate the old task and deallocate our right to it.  */
	  task_terminate (oldtask);
	  mach_port_deallocate (mach_task_self (), oldtask);
	}
      else
	/* Resume the task, it is ready to run the new program.  */
	task_resume (oldtask);
      /* Deallocate the right to the new task we created.  */
      mach_port_deallocate (mach_task_self (), newtask);

      if (boot->nports > INIT_PORT_PROC)
	proc_mark_exec (boot->portarray[INIT_PORT_PROC]);

      for (i = 0; i < nports; ++i)
	if (ports_replaced[i] && portarray[i] != MACH_PORT_NULL)
	  /* This port was replaced, so the reference that arrived in the
	     original portarray is not being saved in BOOT for transfer to
	     the user task.  Deallocate it; we don't want it, and MiG will
	     leave it for us on successful return.  */
	  mach_port_deallocate (mach_task_self (), portarray[i]);

      /* If there is vm_allocate'd space for the original intarray and/or
	 portarray, and we are not saving those pointers in BOOT for later
	 transfer, deallocate the original space now.  */
      if (!intarray_copy && boot->intarray != intarray)
	vm_deallocate (mach_task_self (),
		       (vm_address_t) intarray,
		       nints * sizeof intarray[0]);
      if (!portarray_copy && boot->portarray != portarray)
	vm_deallocate (mach_task_self (),
		       (vm_address_t) portarray,
		       nports * sizeof portarray[0]);
    }

  return e.error;
}

kern_return_t
S_exec_exec (struct trivfs_protid *protid,
	     file_t file,
	     task_t oldtask,
	     int flags,
	     char *argv, u_int argvlen, boolean_t argv_copy,
	     char *envp, u_int envplen, boolean_t envp_copy,
	     mach_port_t *dtable, u_int dtablesize, boolean_t dtable_copy,
	     mach_port_t *portarray, u_int nports, boolean_t portarray_copy,
	     int *intarray, u_int nints, boolean_t intarray_copy,
	     mach_port_t *deallocnames, u_int ndeallocnames,
	     mach_port_t *destroynames, u_int ndestroynames)
{
  if (! protid)
    return EOPNOTSUPP;

#if 0
  if (!(flags & EXEC_SECURE))
    {
      const char envar[] = "\0EXECSERVERS=";
      char *p = NULL;
      if (envplen >= sizeof (envar) &&
	  !memcmp (&envar[1], envp, sizeof (envar) - 2))
	p = envp - 1;
      else
	p = memmem (envp, envplen, envar, sizeof (envar) - 1);
      if (p != NULL)
	{
	  size_t len;
	  char *list;
	  int tried = 0;
	  p += sizeof (envar) - 1;
	  len = strlen (p) + 1;
	  list = alloca (len);
	  memcpy (list, p, len);
	  while ((p = strsep (&list, ":")))
	    {
	      file_t server;
	      if (!hurd_file_name_lookup (portarray[INIT_PORT_CRDIR],
					  portarray[INIT_PORT_CWDIR],
					  p, 0, 0, &server))
		{
		  error_t err;
		  struct trivfs_protid *protid
		    = ports_lookup_port (port_bucket, server,
					 trivfs_protid_portclasses[0]);
		  if (protid)
		    {
		      err = do_exec (file, oldtask, 0,
				     argv, argvlen, argv_copy,
				     envp, envplen, envp_copy,
				     dtable, dtablesize, dtable_copy,
				     portarray, nports, portarray_copy,
				     intarray, nints, intarray_copy,
				     deallocnames, ndeallocnames,
				     destroynames, ndestroynames);
		      ports_port_deref (protid);
		    }
		  else
		    err = exec_exec (server,
				     file, MACH_MSG_TYPE_MOVE_SEND,
				     oldtask, 0,
				     argv, argvlen,
				     envp, envplen,
				     dtable, MACH_MSG_TYPE_MOVE_SEND,
				     dtablesize,
				     portarray, MACH_MSG_TYPE_MOVE_SEND,
				     nports,
				     intarray, nints,
				     deallocnames, ndeallocnames,
				     destroynames, ndestroynames);
		  mach_port_deallocate (mach_task_self (), server);
		  if (err != ENOEXEC)
		    return err;
		  tried = 1;
		}
	    }
	  if (tried)
	    /* At least one exec server got a crack at it and gave up.  */
	    return ENOEXEC;
	}
    }
#endif

  /* There were no user-specified exec servers,
     or none of them could be found.  */

  return do_exec (file, oldtask, flags,
		  argv, argvlen, argv_copy,
		  envp, envplen, envp_copy,
		  dtable, dtablesize, dtable_copy,
		  portarray, nports, portarray_copy,
		  intarray, nints, intarray_copy,
		  deallocnames, ndeallocnames,
		  destroynames, ndestroynames);
}

kern_return_t
S_exec_setexecdata (struct trivfs_protid *protid,
		    mach_port_t *ports, u_int nports, int ports_copy,
		    int *ints, u_int nints, int ints_copy)
{
  error_t err;

  if (! protid || (protid->realnode != MACH_PORT_NULL && ! protid->isroot))
    return EPERM;

  if (nports < INIT_PORT_MAX || nints < INIT_INT_MAX)
    return EINVAL;

  err = servercopy ((void **) &ports, nports * sizeof (mach_port_t),
		    ports_copy);
  if (err)
    return err;
  err = servercopy ((void **) &ints, nints * sizeof (int), ints_copy);
  if (err)
    return err;

  rwlock_writer_lock (&std_lock);

  if (std_ports)
    {
      u_int i;
      for (i = 0; i < std_nports; ++i)
	mach_port_deallocate (mach_task_self (), std_ports[i]);
      vm_deallocate (mach_task_self (), (vm_address_t)std_ports, 
		     std_nports * sizeof (mach_port_t));
    }

  std_ports = ports;
  std_nports = nports;

  if (std_ints)
    vm_deallocate (mach_task_self (), (vm_address_t)std_ints,
		   std_nints * sizeof (int));

  std_ints = ints;
  std_nints = nints;

  rwlock_writer_unlock (&std_lock);

  return 0;
}


/* RPC sent on the bootstrap port.  */

kern_return_t
S_exec_startup (mach_port_t port,
		vm_address_t *stack_base, vm_size_t *stack_size,
		int *flags,
		char **argvp, u_int *argvlen,
		char **envpp, u_int *envplen,
		mach_port_t **dtable, mach_msg_type_name_t *dtablepoly,
		u_int *dtablesize,
		mach_port_t **portarray, mach_msg_type_name_t *portpoly,
		u_int *nports,
		int **intarray, u_int *nints)
{
  struct bootinfo *boot = ports_lookup_port (port_bucket, port,
					     execboot_portclass);
  if (! boot)
    return EOPNOTSUPP;
  ports_port_deref (boot);

  /* Pass back all the information we are storing.  */

  *stack_base = boot->stack_base;
  *stack_size = boot->stack_size;

  *argvp = boot->argv;
  *argvlen = boot->argvlen;
  boot->argvlen = 0;

  *envpp = boot->envp;
  *envplen = boot->envplen;
  boot->envplen = 0;

  *dtable = boot->dtable;
  *dtablesize = boot->dtablesize;
  *dtablepoly = MACH_MSG_TYPE_MOVE_SEND;
  boot->dtablesize = 0;

  *intarray = boot->intarray;
  *nints = boot->nints;
  boot->nints = 0;

  *portarray = boot->portarray;
  *nports = boot->nports;
  *portpoly = MACH_MSG_TYPE_MOVE_SEND;
  boot->nports = 0;

  *flags = boot->flags;

  return 0;
}