sys/i386/ibcs2/imgact_coff.c

   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("$FreeBSD$");
  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);