fs/binfmt_flat.c

   1 /*
   2  *  linux/fs/binfmt_flat.c
   3  *
   4  *      Copyright (C) 2000, 2001 Lineo, by David McCullough <davidm@uclinux.org>
   5  *      Copyright (C) 2002 Greg Ungerer <gerg@snapgear.com>
   6  *
   7  *  based heavily on:
   8  *
   9  *  linux/fs/binfmt_aout.c:
  10  *      Copyright (C) 1991, 1992, 1996  Linus Torvalds
  11  *  linux/fs/binfmt_flat.c for 2.0 kernel
  12  *      Copyright (C) 1998  Kenneth Albanowski <kjahds@kjahds.com>
  13  *      JAN/99 -- coded full program relocation (gerg@snapgear.com)
  14  */
  15
  16 #include <linux/module.h>
  17 #include <linux/config.h>
  18 #include <linux/kernel.h>
  19 #include <linux/sched.h>
  20 #include <linux/mm.h>
  21 #include <linux/mman.h>
  22 #include <linux/a.out.h>
  23 #include <linux/errno.h>
  24 #include <linux/signal.h>
  25 #include <linux/string.h>
  26 #include <linux/fs.h>
  27 #include <linux/file.h>
  28 #include <linux/stat.h>
  29 #include <linux/fcntl.h>
  30 #include <linux/ptrace.h>
  31 #include <linux/user.h>
  32 #include <linux/slab.h>
  33 #include <linux/binfmts.h>
  34 #include <linux/personality.h>
  35 #include <linux/init.h>
  36 #include <linux/flat.h>
  37
  38 #include <asm/byteorder.h>
  39 #include <asm/system.h>
  40 #include <asm/uaccess.h>
  41 #include <asm/pgalloc.h>
  42 #include <asm/unaligned.h>
  43 #include <asm/cacheflush.h>
  44
  45 #undef DEBUG
  46 #ifdef DEBUG
  47 #define DBG_FLT(a...)   printk(##a)
  48 #else
  49 #define DBG_FLT(a...)
  50 #endif
  51
  52 static int load_flat_binary(struct linux_binprm *, struct pt_regs * regs);
  53 static int load_flat_library(struct file*);
  54 extern void dump_thread(struct pt_regs *, struct user *);
  55
  56 static struct linux_binfmt flat_format = {
  57         NULL, THIS_MODULE, load_flat_binary, load_flat_library, NULL, PAGE_SIZE
  58 };
  59
  60
  61 /*
  62  * create_flat_tables() parses the env- and arg-strings in new user
  63  * memory and creates the pointer tables from them, and puts their
  64  * addresses on the "stack", returning the new stack pointer value.
  65  */
  66 static unsigned long create_flat_tables(
  67         unsigned long pp,
  68         struct linux_binprm * bprm)
  69 {
  70         unsigned long *argv,*envp;
  71         unsigned long * sp;
  72         char * p = (char*)pp;
  73         int argc = bprm->argc;
  74         int envc = bprm->envc;
  75         char dummy;
  76
  77         sp = (unsigned long *) ((-(unsigned long)sizeof(char *))&(unsigned long) p);
  78
  79         sp -= envc+1;
  80         envp = sp;
  81         sp -= argc+1;
  82         argv = sp;
  83         put_user((unsigned long) envp, --sp);
  84         put_user((unsigned long) argv, --sp);
  85         put_user(argc,--sp);
  86         current->mm->arg_start = (unsigned long) p;
  87         while (argc-->0) {
  88                 put_user((unsigned long) p, argv++);
  89                 do {
  90                         get_user(dummy, p); p++;
  91                 } while (dummy);
  92         }
  93         put_user((unsigned long) NULL, argv);
  94         current->mm->arg_end = current->mm->env_start = (unsigned long) p;
  95         while (envc-->0) {
  96                 put_user((unsigned long)p, envp); envp++;
  97                 do {
  98                         get_user(dummy, p); p++;
  99                 } while (dummy);
 100         }
 101         put_user((unsigned long) NULL, envp);
 102         current->mm->env_end = (unsigned long) p;
 103         return (unsigned long)sp;
 104 }
 105
 106
 107 #ifdef CONFIG_BINFMT_ZFLAT
 108
 109 #include <linux/zlib.h>
 110
 111 #define LBUFSIZE        4000
 112
 113 /* gzip flag byte */
 114 #define ASCII_FLAG   0x01 /* bit 0 set: file probably ASCII text */
 115 #define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
 116 #define EXTRA_FIELD  0x04 /* bit 2 set: extra field present */
 117 #define ORIG_NAME    0x08 /* bit 3 set: original file name present */
 118 #define COMMENT      0x10 /* bit 4 set: file comment present */
 119 #define ENCRYPTED    0x20 /* bit 5 set: file is encrypted */
 120 #define RESERVED     0xC0 /* bit 6,7:   reserved */
 121
 122 static int decompress_exec(
 123         struct linux_binprm *bprm,
 124         unsigned long offset,
 125         char *dst,
 126         long len,
 127         int fd)
 128 {
 129         unsigned char *buf;
 130         z_stream strm;
 131         loff_t fpos;
 132         int ret;
 133
 134         DBG_FLT("decompress_exec(offset=%x,buf=%x,len=%x)\n",(int)offset, (int)dst, (int)len);
 135
 136         memset(&strm, 0, sizeof(strm));
 137         strm.workspace = kmalloc(zlib_inflate_workspacesize(), GFP_KERNEL);
 138         if (strm.workspace == NULL) {
 139                 DBG_FLT("binfmt_flat: no memory for decompress workspace\n");
 140                 return -ENOMEM;
 141         }
 142         buf = kmalloc(LBUFSIZE, GFP_KERNEL);
 143         if (buf == NULL) {
 144                 DBG_FLT("binfmt_flat: no memory for read buffer\n");
 145                 return -ENOMEM;
 146         }
 147
 148         /* Read in first chunk of data and parse gzip header. */
 149         fpos = offset;
 150         ret = bprm->file->f_op->read(bprm->file, buf, LBUFSIZE, &fpos);
 151
 152         strm.next_in = buf;
 153         strm.avail_in = ret;
 154         strm.total_in = 0;
 155
 156         /* Check minimum size -- gzip header */
 157         if (ret < 10) {
 158                 DBG_FLT("binfmt_flat: file too small?\n");
 159                 return -ENOEXEC;
 160         }
 161
 162         /* Check gzip magic number */
 163         if ((buf[0] != 037) || ((buf[1] != 0213) && (buf[1] != 0236))) {
 164                 DBG_FLT("binfmt_flat: unknown compression magic?\n");
 165                 return -ENOEXEC;
 166         }
 167
 168         /* Check gzip method */
 169         if (buf[2] != 8) {
 170                 DBG_FLT("binfmt_flat: unknown compression method?\n");
 171                 return -ENOEXEC;
 172         }
 173         /* Check gzip flags */
 174         if ((buf[3] & ENCRYPTED) || (buf[3] & CONTINUATION) ||
 175             (buf[3] & RESERVED)) {
 176                 DBG_FLT("binfmt_flat: unknown flags?\n");
 177                 return -ENOEXEC;
 178         }
 179
 180         ret = 10;
 181         if (buf[3] & EXTRA_FIELD)
 182                 ret += 2 + buf[10] + (buf[11] << 8);
 183         if (buf[3] & ORIG_NAME) {
 184                 for (; (buf[ret] != 0); ret++)
 185                         ;
 186         }
 187         if (buf[3] & COMMENT) {
 188                 for (; (buf[ret] != 0); ret++)
 189                         ;
 190         }
 191
 192         strm.next_in += ret;
 193         strm.avail_in -= ret;
 194
 195         strm.next_out = dst;
 196         strm.avail_out = len;
 197         strm.total_out = 0;
 198
 199         if (zlib_inflateInit2(&strm, -MAX_WBITS) != Z_OK) {
 200                 DBG_FLT("binfmt_flat: zlib init failed?\n");
 201                 return -ENOEXEC;
 202         }
 203
 204         while ((ret = zlib_inflate(&strm, Z_NO_FLUSH)) == Z_OK) {
 205                 ret = bprm->file->f_op->read(bprm->file, buf, LBUFSIZE, &fpos);
 206                 if (ret == 0)
 207                         break;
 208                 if (ret >= (unsigned long) -4096)
 209                         break;
 210                 len -= ret;
 211
 212                 strm.next_in = buf;
 213                 strm.avail_in = ret;
 214                 strm.total_in = 0;
 215         }
 216
 217         if (ret < 0) {
 218                 DBG_FLT("binfmt_flat: decompression failed (%d), %s\n",
 219                         ret, strm.msg);
 220                 return -ENOEXEC;
 221         }
 222
 223         zlib_inflateEnd(&strm);
 224         kfree(buf);
 225         kfree(strm.workspace);
 226         return 0;
 227 }
 228
 229 #endif /* CONFIG_BINFMT_ZFLAT */
 230
 231
 232 static unsigned long
 233 calc_reloc(unsigned long r, unsigned long text_len)
 234 {
 235         unsigned long addr;
 236
 237         if (r > current->mm->start_brk - current->mm->start_data + text_len) {
 238                 printk("BINFMT_FLAT: reloc outside program 0x%x (0 - 0x%x), killing!\n",
 239                                 (int) r,(int)(current->mm->start_brk-current->mm->start_code));
 240                 send_sig(SIGSEGV, current, 0);
 241                 return(current->mm->start_brk); /* return something safe to write to */
 242         }
 243
 244         if (r < text_len) {
 245                 /* In text segment */
 246                 return r + current->mm->start_code;
 247         }
 248
 249         /*
 250          * we allow inclusive ranges here so that programs may do things
 251          * like reference the end of data (_end) without failing these tests
 252          */
 253         addr =  r - text_len + current->mm->start_data;
 254         if (addr >= current->mm->start_code &&
 255                         addr <= current->mm->start_code + text_len)
 256                 return(addr);
 257
 258         if (addr >= current->mm->start_data &&
 259                         addr <= current->mm->start_brk)
 260                 return(addr);
 261
 262         printk("BINFMT_FLAT: reloc addr outside text/data 0x%x "
 263                         "code(0x%x - 0x%x) data(0x%x - 0x%x) killing\n", (int) addr,
 264                         (int) current->mm->start_code,
 265                         (int) (current->mm->start_code + text_len),
 266                         (int) current->mm->start_data,
 267                         (int) current->mm->start_brk);
 268         send_sig(SIGSEGV, current, 0);
 269
 270         return(current->mm->start_brk); /* return something safe to write to */
 271 }
 272
 273
 274 void old_reloc(unsigned long rl)
 275 {
 276 #ifdef DEBUG
 277         char *segment[] = { "TEXT", "DATA", "BSS", "*UNKNOWN*" };
 278 #endif
 279         flat_v2_reloc_t r;
 280         unsigned long *ptr;
 281
 282         r.value = rl;
 283 #if defined(CONFIG_COLDFIRE)
 284         ptr = (unsigned long *) (current->mm->start_code + r.reloc.offset);
 285 #else
 286         ptr = (unsigned long *) (current->mm->start_data + r.reloc.offset);
 287 #endif
 288
 289 #ifdef DEBUG
 290         printk("Relocation of variable at DATASEG+%x "
 291                 "(address %p, currently %x) into segment %s\n",
 292                 r.reloc.offset, ptr, (int)*ptr, segment[r.reloc.type]);
 293 #endif
 294
 295         switch (r.reloc.type) {
 296         case OLD_FLAT_RELOC_TYPE_TEXT:
 297                 *ptr += current->mm->start_code;
 298                 break;
 299         case OLD_FLAT_RELOC_TYPE_DATA:
 300                 *ptr += current->mm->start_data;
 301                 break;
 302         case OLD_FLAT_RELOC_TYPE_BSS:
 303                 *ptr += current->mm->end_data;
 304                 break;
 305         default:
 306                 printk("BINFMT_FLAT: Unknown relocation type=%x\n", r.reloc.type);
 307                 break;
 308         }
 309
 310 #ifdef DEBUG
 311         printk("Relocation became %x\n", (int)*ptr);
 312 #endif
 313 }
 314
 315
 316 /*
 317  * These are the functions used to load flat style executables and shared
 318  * libraries.  There is no binary dependent code anywhere else.
 319  */
 320
 321 static int load_flat_binary(struct linux_binprm * bprm, struct pt_regs * regs)
 322 {
 323         struct flat_hdr * hdr;
 324         unsigned long textpos = 0, datapos = 0, result;
 325         unsigned long text_len, data_len, bss_len, stack_len, flags;
 326         unsigned long memp = 0, memkasked = 0; /* for finding the brk area */
 327         unsigned long extra, rlim;
 328         unsigned long p = bprm->p;
 329         unsigned long *reloc = 0, *rp;
 330         struct inode *inode;
 331         int i, rev, relocs = 0;
 332         loff_t fpos;
 333
 334         DBG_FLT("BINFMT_FLAT: Loading file: %x\n", bprm->file);
 335
 336         hdr = ((struct flat_hdr *) bprm->buf);          /* exec-header */
 337         inode = bprm->file->f_dentry->d_inode;
 338
 339         text_len  = ntohl(hdr->data_start);
 340         data_len  = ntohl(hdr->data_end) - ntohl(hdr->data_start);
 341         bss_len   = ntohl(hdr->bss_end) - ntohl(hdr->data_end);
 342         stack_len = ntohl(hdr->stack_size);
 343         relocs    = ntohl(hdr->reloc_count);
 344         flags     = ntohl(hdr->flags);
 345         rev       = ntohl(hdr->rev);
 346
 347         /*
 348          * We have to add the size of our arguments to our stack size
 349          * otherwise it's too easy for users to create stack overflows
 350          * by passing in a huge argument list.  And yes,  we have to be
 351          * pedantic and include space for the argv/envp array as it may have
 352          * a lot of entries.
 353          */
 354         #define TOP_OF_ARGS (PAGE_SIZE*MAX_ARG_PAGES-sizeof(void *))
 355         stack_len += TOP_OF_ARGS - bprm->p;             /* the strings */
 356         stack_len += (bprm->argc + 1) * sizeof(char *); /* the argv array */
 357         stack_len += (bprm->envc + 1) * sizeof(char *); /* the envp array */
 358
 359         if (strncmp(hdr->magic, "bFLT", 4) ||
 360                         (rev != FLAT_VERSION && rev != OLD_FLAT_VERSION)) {
 361                 /*
 362                  * because a lot of people do not manage to produce good
 363                  * flat binaries,  we leave this printk to help them realise
 364                  * the problem.  We only print the error if its * not a script file
 365                  */
 366                 if (strncmp(hdr->magic, "#!", 2))
 367                         printk("BINFMT_FLAT: bad magic/rev (0x%x, need 0x%x)\n",
 368                                         rev, (int) FLAT_VERSION);
 369                 return -ENOEXEC;
 370         }
 371
 372         /*
 373          * fix up the flags for the older format,  there were all kinds
 374          * of endian hacks,  this only works for the simple cases
 375          */
 376         if (rev == OLD_FLAT_VERSION && flags)
 377                 flags = FLAT_FLAG_RAM;
 378
 379 #ifndef CONFIG_BINFMT_ZFLAT
 380         if (flags & (FLAT_FLAG_GZIP|FLAT_FLAG_GZDATA)) {
 381                 printk("Support for ZFLAT executables is not enabled.\n");
 382                 return -ENOEXEC;
 383         }
 384 #endif
 385
 386         /*
 387          * Check initial limits. This avoids letting people circumvent
 388          * size limits imposed on them by creating programs with large
 389          * arrays in the data or bss.
 390          */
 391         rlim = current->rlim[RLIMIT_DATA].rlim_cur;
 392         if (rlim >= RLIM_INFINITY)
 393                 rlim = ~0;
 394         if (data_len + bss_len > rlim)
 395                 return -ENOMEM;
 396
 397         /* Flush all traces of the currently running executable */
 398         result = flush_old_exec(bprm);
 399         if (result)
 400                 return result;
 401
 402         /* OK, This is the point of no return */
 403         set_personality(PER_LINUX);
 404
 405         /*
 406          * there are a couple of cases here,  the seperate code/data
 407          * case,  and then the fully copied to RAM case which lumps
 408          * it all together.
 409          */
 410         if ((flags & (FLAT_FLAG_RAM|FLAT_FLAG_GZIP)) == 0) {
 411                 /*
 412                  * this should give us a ROM ptr,  but if it doesn't we don't
 413                  * really care
 414                  */
 415                 DBG_FLT("BINFMT_FLAT: ROM mapping of file (we hope)\n");
 416
 417                 down_write(&current->mm->mmap_sem);
 418                 textpos = do_mmap(bprm->file, 0, text_len, PROT_READ|PROT_EXEC, 0, 0);
 419                 up_write(&current->mm->mmap_sem);
 420                 if (!textpos  || textpos >= (unsigned long) -4096) {
 421                         if (!textpos)
 422                                 textpos = (unsigned long) -ENOMEM;
 423                         printk("Unable to mmap process text, errno %d\n", (int)-textpos);
 424                 }
 425
 426                 extra = max(bss_len + stack_len, relocs * sizeof(unsigned long)),
 427
 428                 down_write(&current->mm->mmap_sem);
 429                 datapos = do_mmap(0, 0, data_len + extra,
 430                                 PROT_READ|PROT_WRITE|PROT_EXEC, 0, 0);
 431                 up_write(&current->mm->mmap_sem);
 432
 433                 if (datapos == 0 || datapos >= (unsigned long)-4096) {
 434                         if (!datapos)
 435                                 datapos = (unsigned long) -ENOMEM;
 436                         printk("Unable to allocate RAM for process data, errno %d\n",
 437                                         (int)-datapos);
 438                         do_munmap(current->mm, textpos, text_len);
 439                         return datapos;
 440                 }
 441
 442                 DBG_FLT("BINFMT_FLAT: Allocated data+bss+stack (%d bytes): %x\n",
 443                                 data_len + bss_len + stack_len, datapos);
 444
 445                 fpos = ntohl(hdr->data_start);
 446 #ifdef CONFIG_BINFMT_ZFLAT
 447                 if (flags & FLAT_FLAG_GZDATA) {
 448                         result = decompress_exec(bprm, fpos, (char *) datapos,
 449                                                  data_len + (relocs * sizeof(unsigned long)), 0);
 450                 } else
 451 #endif
 452                 {
 453                         result = bprm->file->f_op->read(bprm->file,
 454                                         (char *) datapos, data_len + extra, &fpos);
 455                 }
 456                 if (result >= (unsigned long)-4096) {
 457                         printk("Unable to read data+bss, errno %d\n", (int)-result);
 458                         do_munmap(current->mm, textpos, text_len);
 459                         do_munmap(current->mm, datapos, data_len + extra);
 460                         return result;
 461                 }
 462
 463                 reloc = (unsigned long *) (datapos+(ntohl(hdr->reloc_start)-text_len));
 464                 memp = datapos;
 465                 memkasked = data_len + extra;
 466
 467         } else {
 468
 469                 /*
 470                  * calculate the extra space we need to map in
 471                  */
 472
 473                 extra = max(bss_len + stack_len, relocs * sizeof(unsigned long)),
 474
 475                 down_write(&current->mm->mmap_sem);
 476                 textpos = do_mmap(0, 0, text_len + data_len + extra,
 477                                 PROT_READ | PROT_EXEC | PROT_WRITE, 0, 0);
 478                 up_write(&current->mm->mmap_sem);
 479                 if (!textpos  || textpos >= (unsigned long) -4096) {
 480                         if (!textpos)
 481                                 textpos = (unsigned long) -ENOMEM;
 482                         printk("Unable to allocate RAM for process text/data, errno %d\n",
 483                                         (int)-textpos);
 484                 }
 485
 486                 datapos = textpos + ntohl (hdr->data_start);
 487                 reloc = (unsigned long *) (textpos + ntohl(hdr->reloc_start));
 488                 memp = textpos;
 489                 memkasked = text_len + data_len + extra;
 490
 491 #ifdef CONFIG_BINFMT_ZFLAT
 492                 /*
 493                  * load it all in and treat it like a RAM load from now on
 494                  */
 495                 if (flags & FLAT_FLAG_GZIP) {
 496                         result = decompress_exec(bprm, sizeof (struct flat_hdr),
 497                                          (((char *) textpos) + sizeof (struct flat_hdr)),
 498                                          (text_len + data_len + (relocs * sizeof(unsigned long))
 499                                                   - sizeof (struct flat_hdr)),
 500                                          0);
 501                 } else if (flags & FLAT_FLAG_GZDATA) {
 502                         fpos = 0;
 503                         result = bprm->file->f_op->read(bprm->file,
 504                                         (char *) textpos, text_len, &fpos);
 505                         if (result < (unsigned long) -4096)
 506                                 result = decompress_exec(bprm, text_len, (char *) datapos,
 507                                                  data_len + (relocs * sizeof(unsigned long)), 0);
 508                 }
 509                 else
 510 #endif
 511                 {
 512                         fpos = 0;
 513                         result = bprm->file->f_op->read(bprm->file,
 514                                         (char *) textpos, text_len + data_len + extra, &fpos);
 515                 }
 516                 if (result >= (unsigned long)-4096) {
 517                         printk("Unable to read code+data+bss, errno %d\n",(int)-result);
 518                         do_munmap(current->mm, textpos, text_len + data_len + extra);
 519                         return result;
 520                 }
 521         }
 522
 523         DBG_FLT("Mapping is %x, Entry point is %x, data_start is %x\n",
 524                         textpos, ntohl(hdr->entry), ntohl(hdr->data_start));
 525
 526         current->mm->start_code = textpos + sizeof (struct flat_hdr);
 527         current->mm->end_code = textpos + text_len;
 528         current->mm->start_data = datapos;
 529         current->mm->end_data = datapos + data_len;
 530         /*
 531          *      set up the brk stuff (uses any slack left in data/bss/stack allocation
 532          *      We put the brk after the bss (between the bss and stack) like other
 533          *      platforms.
 534          */
 535         current->mm->start_brk = datapos + data_len + bss_len;
 536         current->mm->brk = (current->mm->start_brk + 3) & ~3;
 537         current->mm->context.end_brk = memp + ksize((void *) memp) - stack_len;
 538         current->mm->rss = 0;
 539
 540         DBG_FLT("Load %s: TEXT=%x-%x DATA=%x-%x BSS=%x-%x\n",
 541                 bprm->filename,
 542                 (int) current->mm->start_code, (int) current->mm->end_code,
 543                 (int) current->mm->start_data, (int) current->mm->end_data,
 544                 (int) current->mm->end_data, (int) current->mm->brk);
 545
 546         text_len -= sizeof(struct flat_hdr); /* the real code len */
 547
 548         /*
 549          * We just load the allocations into some temporary memory to
 550          * help simplify all this mumbo jumbo
 551          *
 552          * We've got two different sections of relocation entries.
 553          * The first is the GOT which resides at the begining of the data segment
 554          * and is terminated with a -1.  This one can be relocated in place.
 555          * The second is the extra relocation entries tacked after the image's
 556          * data segment. These require a little more processing as the entry is
 557          * really an offset into the image which contains an offset into the
 558          * image.
 559          */
 560
 561         if (flags & FLAT_FLAG_GOTPIC) {
 562                 for (rp = (unsigned long *)datapos; *rp != 0xffffffff; rp++)
 563                         *rp = calc_reloc(*rp, text_len);
 564         }
 565
 566         /*
 567          * Now run through the relocation entries.
 568          * We've got to be careful here as C++ produces relocatable zero
 569          * entries in the constructor and destructor tables which are then
 570          * tested for being not zero (which will always occur unless we're
 571          * based from address zero).  This causes an endless loop as __start
 572          * is at zero.  The solution used is to not relocate zero addresses.
 573          * This has the negative side effect of not allowing a global data
 574          * reference to be statically initialised to _stext (I've moved
 575          * __start to address 4 so that is okay).
 576          */
 577
 578         if (rev > OLD_FLAT_VERSION) {
 579                 for (i=0; i < relocs; i++) {
 580                         unsigned long addr;
 581
 582                         /* Get the address of the pointer to be
 583                            relocated (of course, the address has to be
 584                            relocated first).  */
 585                         rp = (unsigned long *) calc_reloc(ntohl(reloc[i]), text_len);
 586
 587                         /* Get the pointer's value.  */
 588                         addr = get_unaligned (rp);
 589
 590                         if (addr != 0) {
 591                                 /*
 592                                  * Do the relocation.  PIC relocs in the data section are
 593                                  * already in target order
 594                                  */
 595                                 addr = calc_reloc(
 596                                                 (flags & FLAT_FLAG_GOTPIC) ? addr : ntohl(addr),
 597                                                 text_len);
 598                                 /* Write back the relocated pointer.  */
 599                                 put_unaligned (addr, rp);
 600                         }
 601                 }
 602         } else {
 603                 for (i=0; i < relocs; i++)
 604                         old_reloc(ntohl(reloc[i]));
 605         }
 606
 607         /* zero the BSS,  BRK and stack areas */
 608         memset((void*)(datapos + data_len), 0, bss_len +
 609                         (current->mm->context.end_brk - current->mm->start_brk) +
 610                         stack_len);
 611
 612         compute_creds(bprm);
 613         current->flags &= ~PF_FORKNOEXEC;
 614
 615         flush_icache_range(current->mm->start_code, current->mm->end_code);
 616
 617         set_binfmt(&flat_format);
 618
 619         p = ((current->mm->context.end_brk + stack_len + 3) & ~3) - 4;
 620         DBG_FLT("p=%x\n", p);
 621
 622         /* copy the arg pages onto the stack, this could be more efficient :-) */
 623         for (i = TOP_OF_ARGS - 1; i >= bprm->p; i--)
 624                 * (char *) --p =
 625                         ((char *) page_address(bprm->page[i/PAGE_SIZE]))[i % PAGE_SIZE];
 626
 627         current->mm->start_stack = (unsigned long) create_flat_tables(p, bprm);
 628
 629         DBG_FLT("start_thread(regs=0x%x, entry=0x%x, start_stack=0x%x)\n",
 630                 regs, textpos + ntohl(hdr->entry), current->mm->start_stack);
 631         start_thread(regs,
 632                      textpos + ntohl(hdr->entry),
 633                      current->mm->start_stack);
 634
 635         if (current->ptrace & PT_PTRACED)
 636                 send_sig(SIGTRAP, current, 0);
 637
 638         return 0;
 639 }
 640
 641 static int load_flat_library(struct file *file)
 642 {
 643         return(-ENOEXEC);
 644 }
 645
 646 static int __init init_flat_binfmt(void)
 647 {
 648         return register_binfmt(&flat_format);
 649 }
 650
 651 static void __exit exit_flat_binfmt(void)
 652 {
 653         unregister_binfmt(&flat_format);
 654 }
 655
 656 EXPORT_NO_SYMBOLS;
 657
 658 module_init(init_flat_binfmt);
 659 module_exit(exit_flat_binfmt);