The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/i386/ibcs2/imgact_coff.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 1994 Sean Eric Fagan
    5  * Copyright (c) 1994 Søren Schmidt
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer
   13  *    in this position and unchanged.
   14  * 2. Redistributions in binary form must reproduce the above copyright
   15  *    notice, this list of conditions and the following disclaimer in the
   16  *    documentation and/or other materials provided with the distribution.
   17  * 3. The name of the author may not be used to endorse or promote products
   18  *    derived from this software without specific prior written permission
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   21  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   22  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   23  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   24  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   25  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   29  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   30  */
   31 
   32 #include <sys/cdefs.h>
   33 __FBSDID("$FreeBSD: stable/12/sys/i386/ibcs2/imgact_coff.c 326260 2017-11-27 15:08:52Z pfg $");
   34 
   35 #include <sys/param.h>
   36 #include <sys/systm.h>
   37 #include <sys/exec.h>
   38 #include <sys/fcntl.h>
   39 #include <sys/imgact.h>
   40 #include <sys/kernel.h>
   41 #include <sys/lock.h>
   42 #include <sys/malloc.h>
   43 #include <sys/mman.h>
   44 #include <sys/mount.h>
   45 #include <sys/namei.h>
   46 #include <sys/vnode.h>
   47 
   48 #include <vm/vm.h>
   49 #include <vm/pmap.h>
   50 #include <vm/vm_map.h>
   51 #include <vm/vm_kern.h>
   52 #include <vm/vm_extern.h>
   53 
   54 #include <i386/ibcs2/coff.h>
   55 #include <i386/ibcs2/ibcs2_util.h>
   56 
   57 MODULE_DEPEND(coff, ibcs2, 1, 1, 1);
   58 
   59 extern struct sysentvec ibcs2_svr3_sysvec;
   60 
   61 static int coff_load_file(struct thread *td, char *name);
   62 static int exec_coff_imgact(struct image_params *imgp);
   63 
   64 static int load_coff_section(struct vmspace *vmspace, struct vnode *vp, vm_offset_t offset, caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot);
   65 
   66 static int
   67 load_coff_section(struct vmspace *vmspace, struct vnode *vp, vm_offset_t offset,
   68                   caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot)
   69 {
   70         size_t map_len;
   71         vm_offset_t map_offset;
   72         vm_offset_t map_addr;
   73         int error;
   74         unsigned char *data_buf = NULL;
   75         size_t copy_len;
   76 
   77         map_offset = trunc_page(offset);
   78         map_addr = trunc_page((vm_offset_t)vmaddr);
   79 
   80         if (memsz > filsz) {
   81                 /*
   82                  * We have the stupid situation that
   83                  * the section is longer than it is on file,
   84                  * which means it has zero-filled areas, and
   85                  * we have to work for it.  Stupid iBCS!
   86                  */
   87                 map_len = trunc_page(offset + filsz) - trunc_page(map_offset);
   88         } else {
   89                 /*
   90                  * The only stuff we care about is on disk, and we
   91                  * don't care if we map in more than is really there.
   92                  */
   93                 map_len = round_page(offset + filsz) - trunc_page(map_offset);
   94         }
   95 
   96         DPRINTF(("%s(%d):  vm_mmap(&vmspace->vm_map, &0x%08jx, 0x%x, 0x%x, "
   97                 "VM_PROT_ALL, MAP_PRIVATE | MAP_FIXED, OBJT_VNODE, vp, 0x%x)\n",
   98                 __FILE__, __LINE__, (uintmax_t)map_addr, map_len, prot,
   99                 map_offset));
  100 
  101         if ((error = vm_mmap(&vmspace->vm_map,
  102                              &map_addr,
  103                              map_len,
  104                              prot,
  105                              VM_PROT_ALL,
  106                              MAP_PRIVATE | MAP_FIXED,
  107                              OBJT_VNODE,
  108                              vp,
  109                              map_offset)) != 0)
  110                 return error;
  111 
  112         if (memsz == filsz) {
  113                 /* We're done! */
  114                 return 0;
  115         }
  116 
  117         /*
  118          * Now we have screwball stuff, to accomodate stupid COFF.
  119          * We have to map the remaining bit of the file into the kernel's
  120          * memory map, allocate some anonymous memory, copy that last
  121          * bit into it, and then we're done. *sigh*
  122          * For clean-up reasons, we actally map in the file last.
  123          */
  124 
  125         copy_len = (offset + filsz) - trunc_page(offset + filsz);
  126         map_addr = trunc_page((vm_offset_t)vmaddr + filsz);
  127         map_len = round_page((vm_offset_t)vmaddr + memsz) - map_addr;
  128 
  129         DPRINTF(("%s(%d): vm_map_find(&vmspace->vm_map, NULL, 0, &0x%08jx,0x%x, VMFS_NO_SPACE, VM_PROT_ALL, VM_PROT_ALL, 0)\n", __FILE__, __LINE__, (uintmax_t)map_addr, map_len));
  130 
  131         if (map_len != 0) {
  132                 error = vm_map_find(&vmspace->vm_map, NULL, 0, &map_addr,
  133                     map_len, 0, VMFS_NO_SPACE, VM_PROT_ALL, VM_PROT_ALL, 0);
  134                 if (error)
  135                         return (vm_mmap_to_errno(error));
  136         }
  137 
  138         if ((error = vm_mmap(exec_map,
  139                             (vm_offset_t *) &data_buf,
  140                             PAGE_SIZE,
  141                             VM_PROT_READ,
  142                             VM_PROT_READ,
  143                             0,
  144                             OBJT_VNODE,
  145                             vp,
  146                             trunc_page(offset + filsz))) != 0)
  147                 return error;
  148 
  149         error = copyout(data_buf, (caddr_t) map_addr, copy_len);
  150 
  151         kmap_free_wakeup(exec_map, (vm_offset_t)data_buf, PAGE_SIZE);
  152 
  153         return error;
  154 }
  155 
  156 static int
  157 coff_load_file(struct thread *td, char *name)
  158 {
  159         struct proc *p = td->td_proc;
  160         struct vmspace *vmspace = p->p_vmspace;
  161         int error;
  162         struct nameidata nd;
  163         struct vnode *vp;
  164         struct vattr attr;
  165         struct filehdr *fhdr;
  166         struct aouthdr *ahdr;
  167         struct scnhdr *scns;
  168         char *ptr = NULL;
  169         int nscns;
  170         unsigned long text_offset = 0, text_address = 0, text_size = 0;
  171         unsigned long data_offset = 0, data_address = 0, data_size = 0;
  172         unsigned long bss_size = 0;
  173         int i, writecount;
  174 
  175         NDINIT(&nd, LOOKUP, ISOPEN | LOCKLEAF | FOLLOW | SAVENAME,
  176             UIO_SYSSPACE, name, td);
  177 
  178         error = namei(&nd);
  179         if (error)
  180                 return error;
  181 
  182         vp = nd.ni_vp;
  183         if (vp == NULL)
  184                 return ENOEXEC;
  185 
  186         error = VOP_GET_WRITECOUNT(vp, &writecount);
  187         if (error != 0)
  188                 goto fail;
  189         if (writecount != 0) {
  190                 error = ETXTBSY;
  191                 goto fail;
  192         }
  193 
  194         if ((error = VOP_GETATTR(vp, &attr, td->td_ucred)) != 0)
  195                 goto fail;
  196 
  197         if ((vp->v_mount->mnt_flag & MNT_NOEXEC)
  198             || ((attr.va_mode & 0111) == 0)
  199             || (attr.va_type != VREG))
  200                 goto fail;
  201 
  202         if (attr.va_size == 0) {
  203                 error = ENOEXEC;
  204                 goto fail;
  205         }
  206 
  207         if ((error = VOP_ACCESS(vp, VEXEC, td->td_ucred, td)) != 0)
  208                 goto fail;
  209 
  210         if ((error = VOP_OPEN(vp, FREAD, td->td_ucred, td, NULL)) != 0)
  211                 goto fail;
  212 
  213         /*
  214          * Lose the lock on the vnode. It's no longer needed, and must not
  215          * exist for the pagefault paging to work below.
  216          */
  217         VOP_UNLOCK(vp, 0);
  218 
  219         if ((error = vm_mmap(exec_map,
  220                             (vm_offset_t *) &ptr,
  221                             PAGE_SIZE,
  222                             VM_PROT_READ,
  223                             VM_PROT_READ,
  224                             0,
  225                             OBJT_VNODE,
  226                             vp,
  227                             0)) != 0)
  228                 goto unlocked_fail;
  229 
  230         fhdr = (struct filehdr *)ptr;
  231 
  232         if (fhdr->f_magic != I386_COFF) {
  233                 error = ENOEXEC;
  234                 goto dealloc_and_fail;
  235         }
  236 
  237         nscns = fhdr->f_nscns;
  238 
  239         if ((nscns * sizeof(struct scnhdr)) > PAGE_SIZE) {
  240                 /*
  241                  * XXX -- just fail.  I'm so lazy.
  242                  */
  243                 error = ENOEXEC;
  244                 goto dealloc_and_fail;
  245         }
  246 
  247         ahdr = (struct aouthdr*)(ptr + sizeof(struct filehdr));
  248 
  249         scns = (struct scnhdr*)(ptr + sizeof(struct filehdr)
  250                           + sizeof(struct aouthdr));
  251 
  252         for (i = 0; i < nscns; i++) {
  253                 if (scns[i].s_flags & STYP_NOLOAD)
  254                         continue;
  255                 else if (scns[i].s_flags & STYP_TEXT) {
  256                         text_address = scns[i].s_vaddr;
  257                         text_size = scns[i].s_size;
  258                         text_offset = scns[i].s_scnptr;
  259                 }
  260                 else if (scns[i].s_flags & STYP_DATA) {
  261                         data_address = scns[i].s_vaddr;
  262                         data_size = scns[i].s_size;
  263                         data_offset = scns[i].s_scnptr;
  264                 } else if (scns[i].s_flags & STYP_BSS) {
  265                         bss_size = scns[i].s_size;
  266                 }
  267         }
  268 
  269         if ((error = load_coff_section(vmspace, vp, text_offset,
  270                                       (caddr_t)(void *)(uintptr_t)text_address,
  271                                       text_size, text_size,
  272                                       VM_PROT_READ | VM_PROT_EXECUTE)) != 0) {
  273                 goto dealloc_and_fail;
  274         }
  275         if ((error = load_coff_section(vmspace, vp, data_offset,
  276                                       (caddr_t)(void *)(uintptr_t)data_address,
  277                                       data_size + bss_size, data_size,
  278                                       VM_PROT_ALL)) != 0) {
  279                 goto dealloc_and_fail;
  280         }
  281 
  282         error = 0;
  283 
  284  dealloc_and_fail:
  285         kmap_free_wakeup(exec_map, (vm_offset_t)ptr,  PAGE_SIZE);
  286  fail:
  287         VOP_UNLOCK(vp, 0);
  288  unlocked_fail:
  289         NDFREE(&nd, NDF_ONLY_PNBUF);
  290         vrele(nd.ni_vp);
  291         return error;
  292 }
  293 
  294 static int
  295 exec_coff_imgact(imgp)
  296         struct image_params *imgp;
  297 {
  298         const struct filehdr *fhdr = (const struct filehdr*)imgp->image_header;
  299         const struct aouthdr *ahdr;
  300         const struct scnhdr *scns;
  301         int i;
  302         struct vmspace *vmspace;
  303         int nscns;
  304         int error;
  305         unsigned long text_offset = 0, text_address = 0, text_size = 0;
  306         unsigned long data_offset = 0, data_address = 0, data_size = 0;
  307         unsigned long bss_size = 0;
  308         vm_offset_t hole;
  309 
  310         if (fhdr->f_magic != I386_COFF ||
  311             !(fhdr->f_flags & F_EXEC)) {
  312 
  313                  DPRINTF(("%s(%d): return -1\n", __FILE__, __LINE__));
  314                  return -1;
  315         }
  316 
  317         nscns = fhdr->f_nscns;
  318         if ((nscns * sizeof(struct scnhdr)) > PAGE_SIZE) {
  319                 /*
  320                  * For now, return an error -- need to be able to
  321                  * read in all of the section structures.
  322                  */
  323 
  324                 DPRINTF(("%s(%d): return -1\n", __FILE__, __LINE__));
  325                 return -1;
  326         }
  327 
  328         ahdr = (const struct aouthdr*)
  329                ((const char*)(imgp->image_header) + sizeof(struct filehdr));
  330         imgp->entry_addr = ahdr->entry;
  331 
  332         scns = (const struct scnhdr*)
  333                ((const char*)(imgp->image_header) + sizeof(struct filehdr) +
  334                 sizeof(struct aouthdr));
  335 
  336         VOP_UNLOCK(imgp->vp, 0);
  337 
  338         error = exec_new_vmspace(imgp, &ibcs2_svr3_sysvec);
  339         if (error)
  340                 goto fail;
  341         vmspace = imgp->proc->p_vmspace;
  342 
  343         for (i = 0; i < nscns; i++) {
  344 
  345           DPRINTF(("i = %d, s_name = %s, s_vaddr = %08lx, "
  346                    "s_scnptr = %ld s_size = %lx\n", i, scns[i].s_name,
  347                    scns[i].s_vaddr, scns[i].s_scnptr, scns[i].s_size));
  348           if (scns[i].s_flags & STYP_NOLOAD) {
  349                 /*
  350                  * A section that is not loaded, for whatever
  351                  * reason.  It takes precedance over other flag
  352                  * bits...
  353                  */
  354                 continue;
  355           } else if (scns[i].s_flags & STYP_TEXT) {
  356                 text_address = scns[i].s_vaddr;
  357                 text_size = scns[i].s_size;
  358                 text_offset = scns[i].s_scnptr;
  359           } else if (scns[i].s_flags & STYP_DATA) {
  360                 /* .data section */
  361                 data_address = scns[i].s_vaddr;
  362                 data_size = scns[i].s_size;
  363                 data_offset = scns[i].s_scnptr;
  364           } else if (scns[i].s_flags & STYP_BSS) {
  365                 /* .bss section */
  366                 bss_size = scns[i].s_size;
  367           } else if (scns[i].s_flags & STYP_LIB) {
  368                 char *buf = NULL;
  369                 int foff = trunc_page(scns[i].s_scnptr);
  370                 int off = scns[i].s_scnptr - foff;
  371                 int len = round_page(scns[i].s_size + PAGE_SIZE);
  372                 int j;
  373 
  374                 if ((error = vm_mmap(exec_map,
  375                                     (vm_offset_t *) &buf,
  376                                     len,
  377                                     VM_PROT_READ,
  378                                     VM_PROT_READ,
  379                                     MAP_SHARED,
  380                                     OBJT_VNODE,
  381                                     imgp->vp,
  382                                     foff)) != 0) {
  383                         error = ENOEXEC;
  384                         goto fail;
  385                 }
  386                 if(scns[i].s_size) {
  387                         char *libbuf;
  388                         int emul_path_len = strlen(ibcs2_emul_path);
  389 
  390                         libbuf = malloc(MAXPATHLEN + emul_path_len,
  391                                         M_TEMP, M_WAITOK);
  392                         strcpy(libbuf, ibcs2_emul_path);
  393 
  394                         for (j = off; j < scns[i].s_size + off;) {
  395                                 long stroff, nextoff;
  396                                 char *libname;
  397 
  398                                 nextoff = 4 * *(long *)(buf + j);
  399                                 stroff = 4 * *(long *)(buf + j + sizeof(long));
  400 
  401                                 libname = buf + j + stroff;
  402                                 j += nextoff;
  403 
  404                                 DPRINTF(("%s(%d):  shared library %s\n",
  405                                          __FILE__, __LINE__, libname));
  406                                 strlcpy(&libbuf[emul_path_len], libname, MAXPATHLEN);
  407                                 error = coff_load_file(
  408                                     FIRST_THREAD_IN_PROC(imgp->proc), libbuf);
  409                                 if (error)
  410                                         error = coff_load_file(
  411                                             FIRST_THREAD_IN_PROC(imgp->proc),
  412                                             libname);
  413                                 if (error) {
  414                                         printf(
  415                                 "error %d loading coff shared library %s\n",
  416                                             error, libname);
  417                                         break;
  418                                 }
  419                         }
  420                         free(libbuf, M_TEMP);
  421                 }
  422                 kmap_free_wakeup(exec_map, (vm_offset_t)buf, len);
  423                 if (error)
  424                         goto fail;
  425                 }
  426         }
  427         /*
  428          * Map in .text now
  429          */
  430 
  431         DPRINTF(("%s(%d):  load_coff_section(vmspace, "
  432                 "imgp->vp, %08lx, %08lx, 0x%lx, 0x%lx, 0x%x)\n",
  433                 __FILE__, __LINE__, text_offset, text_address,
  434                 text_size, text_size, VM_PROT_READ | VM_PROT_EXECUTE));
  435         if ((error = load_coff_section(vmspace, imgp->vp,
  436                                       text_offset,
  437                                       (caddr_t)(void *)(uintptr_t)text_address,
  438                                       text_size, text_size,
  439                                       VM_PROT_READ | VM_PROT_EXECUTE)) != 0) {
  440                 DPRINTF(("%s(%d): error = %d\n", __FILE__, __LINE__, error));
  441                 goto fail;
  442         }
  443         /*
  444          * Map in .data and .bss now
  445          */
  446 
  447 
  448         DPRINTF(("%s(%d): load_coff_section(vmspace, "
  449                 "imgp->vp, 0x%08lx, 0x%08lx, 0x%lx, 0x%lx, 0x%x)\n",
  450                 __FILE__, __LINE__, data_offset, data_address,
  451                 data_size + bss_size, data_size, VM_PROT_ALL));
  452         if ((error = load_coff_section(vmspace, imgp->vp,
  453                                       data_offset,
  454                                       (caddr_t)(void *)(uintptr_t)data_address,
  455                                       data_size + bss_size, data_size,
  456                                       VM_PROT_ALL)) != 0) {
  457 
  458                 DPRINTF(("%s(%d): error = %d\n", __FILE__, __LINE__, error));
  459                 goto fail;
  460         }
  461 
  462         imgp->interpreted = 0;
  463         imgp->proc->p_sysent = &ibcs2_svr3_sysvec;
  464 
  465         vmspace->vm_tsize = round_page(text_size) >> PAGE_SHIFT;
  466         vmspace->vm_dsize = round_page(data_size + bss_size) >> PAGE_SHIFT;
  467         vmspace->vm_taddr = (caddr_t)(void *)(uintptr_t)text_address;
  468         vmspace->vm_daddr = (caddr_t)(void *)(uintptr_t)data_address;
  469 
  470         hole = trunc_page((vm_offset_t)vmspace->vm_daddr +
  471             ctob(vmspace->vm_dsize));
  472 
  473         DPRINTF(("%s(%d): vm_map_find(&vmspace->vm_map, NULL, 0, &0x%jx, PAGE_SIZE, FALSE, VM_PROT_ALL, VM_PROT_ALL, 0)\n",
  474             __FILE__, __LINE__, (uintmax_t)hole));
  475         DPRINTF(("imgact: error = %d\n", error));
  476 
  477         vm_map_find(&vmspace->vm_map, NULL, 0,
  478             (vm_offset_t *)&hole, PAGE_SIZE, 0, VMFS_NO_SPACE,
  479             VM_PROT_ALL, VM_PROT_ALL, 0);
  480         DPRINTF(("IBCS2: start vm_dsize = 0x%x, vm_daddr = 0x%p end = 0x%p\n",
  481                 ctob(vmspace->vm_dsize), vmspace->vm_daddr,
  482                 ctob(vmspace->vm_dsize) + vmspace->vm_daddr ));
  483         DPRINTF(("%s(%d):  returning %d!\n", __FILE__, __LINE__, error));
  484 
  485 fail:
  486         vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY);
  487 
  488         return (error);
  489 }
  490 
  491 /*
  492  * Tell kern_execve.c about it, with a little help from the linker.
  493  */
  494 static struct execsw coff_execsw = { exec_coff_imgact, "coff" };
  495 EXEC_SET(coff, coff_execsw);

Cache object: 3272412c37a1195881575a7b666e1573


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