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  * Copyright (c) 1994 Sean Eric Fagan
    3  * Copyright (c) 1994 Søren Schmidt
    4  * All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer
   11  *    in this position and unchanged.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. The name of the author may not be used to endorse or promote products
   16  *    derived from this software without specific prior written permission
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   28  */
   29 
   30 #include <sys/cdefs.h>
   31 __FBSDID("$FreeBSD: stable/11/sys/i386/ibcs2/imgact_coff.c 331722 2018-03-29 02:50:57Z eadler $");
   32 
   33 #include <sys/param.h>
   34 #include <sys/systm.h>
   35 #include <sys/exec.h>
   36 #include <sys/fcntl.h>
   37 #include <sys/imgact.h>
   38 #include <sys/kernel.h>
   39 #include <sys/lock.h>
   40 #include <sys/malloc.h>
   41 #include <sys/mman.h>
   42 #include <sys/mount.h>
   43 #include <sys/namei.h>
   44 #include <sys/vnode.h>
   45 
   46 #include <vm/vm.h>
   47 #include <vm/pmap.h>
   48 #include <vm/vm_map.h>
   49 #include <vm/vm_kern.h>
   50 #include <vm/vm_extern.h>
   51 
   52 #include <i386/ibcs2/coff.h>
   53 #include <i386/ibcs2/ibcs2_util.h>
   54 
   55 MODULE_DEPEND(coff, ibcs2, 1, 1, 1);
   56 
   57 extern struct sysentvec ibcs2_svr3_sysvec;
   58 
   59 static int coff_load_file(struct thread *td, char *name);
   60 static int exec_coff_imgact(struct image_params *imgp);
   61 
   62 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);
   63 
   64 static int
   65 load_coff_section(struct vmspace *vmspace, struct vnode *vp, vm_offset_t offset,
   66                   caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot)
   67 {
   68         size_t map_len;
   69         vm_offset_t map_offset;
   70         vm_offset_t map_addr;
   71         int error;
   72         unsigned char *data_buf = NULL;
   73         size_t copy_len;
   74 
   75         map_offset = trunc_page(offset);
   76         map_addr = trunc_page((vm_offset_t)vmaddr);
   77 
   78         if (memsz > filsz) {
   79                 /*
   80                  * We have the stupid situation that
   81                  * the section is longer than it is on file,
   82                  * which means it has zero-filled areas, and
   83                  * we have to work for it.  Stupid iBCS!
   84                  */
   85                 map_len = trunc_page(offset + filsz) - trunc_page(map_offset);
   86         } else {
   87                 /*
   88                  * The only stuff we care about is on disk, and we
   89                  * don't care if we map in more than is really there.
   90                  */
   91                 map_len = round_page(offset + filsz) - trunc_page(map_offset);
   92         }
   93 
   94         DPRINTF(("%s(%d):  vm_mmap(&vmspace->vm_map, &0x%08jx, 0x%x, 0x%x, "
   95                 "VM_PROT_ALL, MAP_PRIVATE | MAP_FIXED, OBJT_VNODE, vp, 0x%x)\n",
   96                 __FILE__, __LINE__, (uintmax_t)map_addr, map_len, prot,
   97                 map_offset));
   98 
   99         if ((error = vm_mmap(&vmspace->vm_map,
  100                              &map_addr,
  101                              map_len,
  102                              prot,
  103                              VM_PROT_ALL,
  104                              MAP_PRIVATE | MAP_FIXED,
  105                              OBJT_VNODE,
  106                              vp,
  107                              map_offset)) != 0)
  108                 return error;
  109 
  110         if (memsz == filsz) {
  111                 /* We're done! */
  112                 return 0;
  113         }
  114 
  115         /*
  116          * Now we have screwball stuff, to accomodate stupid COFF.
  117          * We have to map the remaining bit of the file into the kernel's
  118          * memory map, allocate some anonymous memory, copy that last
  119          * bit into it, and then we're done. *sigh*
  120          * For clean-up reasons, we actally map in the file last.
  121          */
  122 
  123         copy_len = (offset + filsz) - trunc_page(offset + filsz);
  124         map_addr = trunc_page((vm_offset_t)vmaddr + filsz);
  125         map_len = round_page((vm_offset_t)vmaddr + memsz) - map_addr;
  126 
  127         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));
  128 
  129         if (map_len != 0) {
  130                 error = vm_map_find(&vmspace->vm_map, NULL, 0, &map_addr,
  131                     map_len, 0, VMFS_NO_SPACE, VM_PROT_ALL, VM_PROT_ALL, 0);
  132                 if (error)
  133                         return (vm_mmap_to_errno(error));
  134         }
  135 
  136         if ((error = vm_mmap(exec_map,
  137                             (vm_offset_t *) &data_buf,
  138                             PAGE_SIZE,
  139                             VM_PROT_READ,
  140                             VM_PROT_READ,
  141                             0,
  142                             OBJT_VNODE,
  143                             vp,
  144                             trunc_page(offset + filsz))) != 0)
  145                 return error;
  146 
  147         error = copyout(data_buf, (caddr_t) map_addr, copy_len);
  148 
  149         kmap_free_wakeup(exec_map, (vm_offset_t)data_buf, PAGE_SIZE);
  150 
  151         return error;
  152 }
  153 
  154 static int
  155 coff_load_file(struct thread *td, char *name)
  156 {
  157         struct proc *p = td->td_proc;
  158         struct vmspace *vmspace = p->p_vmspace;
  159         int error;
  160         struct nameidata nd;
  161         struct vnode *vp;
  162         struct vattr attr;
  163         struct filehdr *fhdr;
  164         struct aouthdr *ahdr;
  165         struct scnhdr *scns;
  166         char *ptr = NULL;
  167         int nscns;
  168         unsigned long text_offset = 0, text_address = 0, text_size = 0;
  169         unsigned long data_offset = 0, data_address = 0, data_size = 0;
  170         unsigned long bss_size = 0;
  171         int i, writecount;
  172 
  173         NDINIT(&nd, LOOKUP, ISOPEN | LOCKLEAF | FOLLOW | SAVENAME,
  174             UIO_SYSSPACE, name, td);
  175 
  176         error = namei(&nd);
  177         if (error)
  178                 return error;
  179 
  180         vp = nd.ni_vp;
  181         if (vp == NULL)
  182                 return ENOEXEC;
  183 
  184         error = VOP_GET_WRITECOUNT(vp, &writecount);
  185         if (error != 0)
  186                 goto fail;
  187         if (writecount != 0) {
  188                 error = ETXTBSY;
  189                 goto fail;
  190         }
  191 
  192         if ((error = VOP_GETATTR(vp, &attr, td->td_ucred)) != 0)
  193                 goto fail;
  194 
  195         if ((vp->v_mount->mnt_flag & MNT_NOEXEC)
  196             || ((attr.va_mode & 0111) == 0)
  197             || (attr.va_type != VREG))
  198                 goto fail;
  199 
  200         if (attr.va_size == 0) {
  201                 error = ENOEXEC;
  202                 goto fail;
  203         }
  204 
  205         if ((error = VOP_ACCESS(vp, VEXEC, td->td_ucred, td)) != 0)
  206                 goto fail;
  207 
  208         if ((error = VOP_OPEN(vp, FREAD, td->td_ucred, td, NULL)) != 0)
  209                 goto fail;
  210 
  211         /*
  212          * Lose the lock on the vnode. It's no longer needed, and must not
  213          * exist for the pagefault paging to work below.
  214          */
  215         VOP_UNLOCK(vp, 0);
  216 
  217         if ((error = vm_mmap(exec_map,
  218                             (vm_offset_t *) &ptr,
  219                             PAGE_SIZE,
  220                             VM_PROT_READ,
  221                             VM_PROT_READ,
  222                             0,
  223                             OBJT_VNODE,
  224                             vp,
  225                             0)) != 0)
  226                 goto unlocked_fail;
  227 
  228         fhdr = (struct filehdr *)ptr;
  229 
  230         if (fhdr->f_magic != I386_COFF) {
  231                 error = ENOEXEC;
  232                 goto dealloc_and_fail;
  233         }
  234 
  235         nscns = fhdr->f_nscns;
  236 
  237         if ((nscns * sizeof(struct scnhdr)) > PAGE_SIZE) {
  238                 /*
  239                  * XXX -- just fail.  I'm so lazy.
  240                  */
  241                 error = ENOEXEC;
  242                 goto dealloc_and_fail;
  243         }
  244 
  245         ahdr = (struct aouthdr*)(ptr + sizeof(struct filehdr));
  246 
  247         scns = (struct scnhdr*)(ptr + sizeof(struct filehdr)
  248                           + sizeof(struct aouthdr));
  249 
  250         for (i = 0; i < nscns; i++) {
  251                 if (scns[i].s_flags & STYP_NOLOAD)
  252                         continue;
  253                 else if (scns[i].s_flags & STYP_TEXT) {
  254                         text_address = scns[i].s_vaddr;
  255                         text_size = scns[i].s_size;
  256                         text_offset = scns[i].s_scnptr;
  257                 }
  258                 else if (scns[i].s_flags & STYP_DATA) {
  259                         data_address = scns[i].s_vaddr;
  260                         data_size = scns[i].s_size;
  261                         data_offset = scns[i].s_scnptr;
  262                 } else if (scns[i].s_flags & STYP_BSS) {
  263                         bss_size = scns[i].s_size;
  264                 }
  265         }
  266 
  267         if ((error = load_coff_section(vmspace, vp, text_offset,
  268                                       (caddr_t)(void *)(uintptr_t)text_address,
  269                                       text_size, text_size,
  270                                       VM_PROT_READ | VM_PROT_EXECUTE)) != 0) {
  271                 goto dealloc_and_fail;
  272         }
  273         if ((error = load_coff_section(vmspace, vp, data_offset,
  274                                       (caddr_t)(void *)(uintptr_t)data_address,
  275                                       data_size + bss_size, data_size,
  276                                       VM_PROT_ALL)) != 0) {
  277                 goto dealloc_and_fail;
  278         }
  279 
  280         error = 0;
  281 
  282  dealloc_and_fail:
  283         kmap_free_wakeup(exec_map, (vm_offset_t)ptr,  PAGE_SIZE);
  284  fail:
  285         VOP_UNLOCK(vp, 0);
  286  unlocked_fail:
  287         NDFREE(&nd, NDF_ONLY_PNBUF);
  288         vrele(nd.ni_vp);
  289         return error;
  290 }
  291 
  292 static int
  293 exec_coff_imgact(imgp)
  294         struct image_params *imgp;
  295 {
  296         const struct filehdr *fhdr = (const struct filehdr*)imgp->image_header;
  297         const struct aouthdr *ahdr;
  298         const struct scnhdr *scns;
  299         int i;
  300         struct vmspace *vmspace;
  301         int nscns;
  302         int error;
  303         unsigned long text_offset = 0, text_address = 0, text_size = 0;
  304         unsigned long data_offset = 0, data_address = 0, data_size = 0;
  305         unsigned long bss_size = 0;
  306         vm_offset_t hole;
  307 
  308         if (fhdr->f_magic != I386_COFF ||
  309             !(fhdr->f_flags & F_EXEC)) {
  310 
  311                  DPRINTF(("%s(%d): return -1\n", __FILE__, __LINE__));
  312                  return -1;
  313         }
  314 
  315         nscns = fhdr->f_nscns;
  316         if ((nscns * sizeof(struct scnhdr)) > PAGE_SIZE) {
  317                 /*
  318                  * For now, return an error -- need to be able to
  319                  * read in all of the section structures.
  320                  */
  321 
  322                 DPRINTF(("%s(%d): return -1\n", __FILE__, __LINE__));
  323                 return -1;
  324         }
  325 
  326         ahdr = (const struct aouthdr*)
  327                ((const char*)(imgp->image_header) + sizeof(struct filehdr));
  328         imgp->entry_addr = ahdr->entry;
  329 
  330         scns = (const struct scnhdr*)
  331                ((const char*)(imgp->image_header) + sizeof(struct filehdr) +
  332                 sizeof(struct aouthdr));
  333 
  334         VOP_UNLOCK(imgp->vp, 0);
  335 
  336         error = exec_new_vmspace(imgp, &ibcs2_svr3_sysvec);
  337         if (error)
  338                 goto fail;
  339         vmspace = imgp->proc->p_vmspace;
  340 
  341         for (i = 0; i < nscns; i++) {
  342 
  343           DPRINTF(("i = %d, s_name = %s, s_vaddr = %08lx, "
  344                    "s_scnptr = %ld s_size = %lx\n", i, scns[i].s_name,
  345                    scns[i].s_vaddr, scns[i].s_scnptr, scns[i].s_size));
  346           if (scns[i].s_flags & STYP_NOLOAD) {
  347                 /*
  348                  * A section that is not loaded, for whatever
  349                  * reason.  It takes precedance over other flag
  350                  * bits...
  351                  */
  352                 continue;
  353           } else if (scns[i].s_flags & STYP_TEXT) {
  354                 text_address = scns[i].s_vaddr;
  355                 text_size = scns[i].s_size;
  356                 text_offset = scns[i].s_scnptr;
  357           } else if (scns[i].s_flags & STYP_DATA) {
  358                 /* .data section */
  359                 data_address = scns[i].s_vaddr;
  360                 data_size = scns[i].s_size;
  361                 data_offset = scns[i].s_scnptr;
  362           } else if (scns[i].s_flags & STYP_BSS) {
  363                 /* .bss section */
  364                 bss_size = scns[i].s_size;
  365           } else if (scns[i].s_flags & STYP_LIB) {
  366                 char *buf = NULL;
  367                 int foff = trunc_page(scns[i].s_scnptr);
  368                 int off = scns[i].s_scnptr - foff;
  369                 int len = round_page(scns[i].s_size + PAGE_SIZE);
  370                 int j;
  371 
  372                 if ((error = vm_mmap(exec_map,
  373                                     (vm_offset_t *) &buf,
  374                                     len,
  375                                     VM_PROT_READ,
  376                                     VM_PROT_READ,
  377                                     MAP_SHARED,
  378                                     OBJT_VNODE,
  379                                     imgp->vp,
  380                                     foff)) != 0) {
  381                         error = ENOEXEC;
  382                         goto fail;
  383                 }
  384                 if(scns[i].s_size) {
  385                         char *libbuf;
  386                         int emul_path_len = strlen(ibcs2_emul_path);
  387 
  388                         libbuf = malloc(MAXPATHLEN + emul_path_len,
  389                                         M_TEMP, M_WAITOK);
  390                         strcpy(libbuf, ibcs2_emul_path);
  391 
  392                         for (j = off; j < scns[i].s_size + off;) {
  393                                 long stroff, nextoff;
  394                                 char *libname;
  395 
  396                                 nextoff = 4 * *(long *)(buf + j);
  397                                 stroff = 4 * *(long *)(buf + j + sizeof(long));
  398 
  399                                 libname = buf + j + stroff;
  400                                 j += nextoff;
  401 
  402                                 DPRINTF(("%s(%d):  shared library %s\n",
  403                                          __FILE__, __LINE__, libname));
  404                                 strlcpy(&libbuf[emul_path_len], libname, MAXPATHLEN);
  405                                 error = coff_load_file(
  406                                     FIRST_THREAD_IN_PROC(imgp->proc), libbuf);
  407                                 if (error)
  408                                         error = coff_load_file(
  409                                             FIRST_THREAD_IN_PROC(imgp->proc),
  410                                             libname);
  411                                 if (error) {
  412                                         printf(
  413                                 "error %d loading coff shared library %s\n",
  414                                             error, libname);
  415                                         break;
  416                                 }
  417                         }
  418                         free(libbuf, M_TEMP);
  419                 }
  420                 kmap_free_wakeup(exec_map, (vm_offset_t)buf, len);
  421                 if (error)
  422                         goto fail;
  423                 }
  424         }
  425         /*
  426          * Map in .text now
  427          */
  428 
  429         DPRINTF(("%s(%d):  load_coff_section(vmspace, "
  430                 "imgp->vp, %08lx, %08lx, 0x%lx, 0x%lx, 0x%x)\n",
  431                 __FILE__, __LINE__, text_offset, text_address,
  432                 text_size, text_size, VM_PROT_READ | VM_PROT_EXECUTE));
  433         if ((error = load_coff_section(vmspace, imgp->vp,
  434                                       text_offset,
  435                                       (caddr_t)(void *)(uintptr_t)text_address,
  436                                       text_size, text_size,
  437                                       VM_PROT_READ | VM_PROT_EXECUTE)) != 0) {
  438                 DPRINTF(("%s(%d): error = %d\n", __FILE__, __LINE__, error));
  439                 goto fail;
  440         }
  441         /*
  442          * Map in .data and .bss now
  443          */
  444 
  445 
  446         DPRINTF(("%s(%d): load_coff_section(vmspace, "
  447                 "imgp->vp, 0x%08lx, 0x%08lx, 0x%lx, 0x%lx, 0x%x)\n",
  448                 __FILE__, __LINE__, data_offset, data_address,
  449                 data_size + bss_size, data_size, VM_PROT_ALL));
  450         if ((error = load_coff_section(vmspace, imgp->vp,
  451                                       data_offset,
  452                                       (caddr_t)(void *)(uintptr_t)data_address,
  453                                       data_size + bss_size, data_size,
  454                                       VM_PROT_ALL)) != 0) {
  455 
  456                 DPRINTF(("%s(%d): error = %d\n", __FILE__, __LINE__, error));
  457                 goto fail;
  458         }
  459 
  460         imgp->interpreted = 0;
  461         imgp->proc->p_sysent = &ibcs2_svr3_sysvec;
  462 
  463         vmspace->vm_tsize = round_page(text_size) >> PAGE_SHIFT;
  464         vmspace->vm_dsize = round_page(data_size + bss_size) >> PAGE_SHIFT;
  465         vmspace->vm_taddr = (caddr_t)(void *)(uintptr_t)text_address;
  466         vmspace->vm_daddr = (caddr_t)(void *)(uintptr_t)data_address;
  467 
  468         hole = trunc_page((vm_offset_t)vmspace->vm_daddr +
  469             ctob(vmspace->vm_dsize));
  470 
  471         DPRINTF(("%s(%d): vm_map_find(&vmspace->vm_map, NULL, 0, &0x%jx, PAGE_SIZE, FALSE, VM_PROT_ALL, VM_PROT_ALL, 0)\n",
  472             __FILE__, __LINE__, (uintmax_t)hole));
  473         DPRINTF(("imgact: error = %d\n", error));
  474 
  475         vm_map_find(&vmspace->vm_map, NULL, 0,
  476             (vm_offset_t *)&hole, PAGE_SIZE, 0, VMFS_NO_SPACE,
  477             VM_PROT_ALL, VM_PROT_ALL, 0);
  478         DPRINTF(("IBCS2: start vm_dsize = 0x%x, vm_daddr = 0x%p end = 0x%p\n",
  479                 ctob(vmspace->vm_dsize), vmspace->vm_daddr,
  480                 ctob(vmspace->vm_dsize) + vmspace->vm_daddr ));
  481         DPRINTF(("%s(%d):  returning %d!\n", __FILE__, __LINE__, error));
  482 
  483 fail:
  484         vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY);
  485 
  486         return (error);
  487 }
  488 
  489 /*
  490  * Tell kern_execve.c about it, with a little help from the linker.
  491  */
  492 static struct execsw coff_execsw = { exec_coff_imgact, "coff" };
  493 EXEC_SET(coff, coff_execsw);

Cache object: 434850f2b1ba9517f50d4999dad8337c


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