external/bsd/file/dist/src/readelf.c

   1 /*      $NetBSD: readelf.c,v 1.1.1.1 2009/05/08 16:35:06 christos Exp $ */
   2
   3 /*
   4  * Copyright (c) Christos Zoulas 2003.
   5  * All Rights Reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice immediately at the beginning of the file, without modification,
  12  *    this list of conditions, and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
  21  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29 #include "file.h"
  30
  31 #ifndef lint
  32 #if 0
  33 FILE_RCSID("@(#)$File: readelf.c,v 1.81 2008/11/04 16:38:28 christos Exp $")
  34 #else
  35 __RCSID("$NetBSD: readelf.c,v 1.1.1.1 2009/05/08 16:35:06 christos Exp $");
  36 #endif
  37 #endif
  38
  39 #ifdef BUILTIN_ELF
  40 #include <string.h>
  41 #include <ctype.h>
  42 #include <stdlib.h>
  43 #ifdef HAVE_UNISTD_H
  44 #include <unistd.h>
  45 #endif
  46
  47 #include "readelf.h"
  48 #include "magic.h"
  49
  50 #ifdef  ELFCORE
  51 private int dophn_core(struct magic_set *, int, int, int, off_t, int, size_t,
  52     off_t, int *);
  53 #endif
  54 private int dophn_exec(struct magic_set *, int, int, int, off_t, int, size_t,
  55     off_t, int *, int);
  56 private int doshn(struct magic_set *, int, int, int, off_t, int, size_t, int *,
  57     int);
  58 private size_t donote(struct magic_set *, void *, size_t, size_t, int,
  59     int, size_t, int *);
  60
  61 #define ELF_ALIGN(a)    ((((a) + align - 1) / align) * align)
  62
  63 #define isquote(c) (strchr("'\"`", (c)) != NULL)
  64
  65 private uint16_t getu16(int, uint16_t);
  66 private uint32_t getu32(int, uint32_t);
  67 private uint64_t getu64(int, uint64_t);
  68
  69 private uint16_t
  70 getu16(int swap, uint16_t value)
  71 {
  72         union {
  73                 uint16_t ui;
  74                 char c[2];
  75         } retval, tmpval;
  76
  77         if (swap) {
  78                 tmpval.ui = value;
  79
  80                 retval.c[0] = tmpval.c[1];
  81                 retval.c[1] = tmpval.c[0];
  82
  83                 return retval.ui;
  84         } else
  85                 return value;
  86 }
  87
  88 private uint32_t
  89 getu32(int swap, uint32_t value)
  90 {
  91         union {
  92                 uint32_t ui;
  93                 char c[4];
  94         } retval, tmpval;
  95
  96         if (swap) {
  97                 tmpval.ui = value;
  98
  99                 retval.c[0] = tmpval.c[3];
 100                 retval.c[1] = tmpval.c[2];
 101                 retval.c[2] = tmpval.c[1];
 102                 retval.c[3] = tmpval.c[0];
 103
 104                 return retval.ui;
 105         } else
 106                 return value;
 107 }
 108
 109 private uint64_t
 110 getu64(int swap, uint64_t value)
 111 {
 112         union {
 113                 uint64_t ui;
 114                 char c[8];
 115         } retval, tmpval;
 116
 117         if (swap) {
 118                 tmpval.ui = value;
 119
 120                 retval.c[0] = tmpval.c[7];
 121                 retval.c[1] = tmpval.c[6];
 122                 retval.c[2] = tmpval.c[5];
 123                 retval.c[3] = tmpval.c[4];
 124                 retval.c[4] = tmpval.c[3];
 125                 retval.c[5] = tmpval.c[2];
 126                 retval.c[6] = tmpval.c[1];
 127                 retval.c[7] = tmpval.c[0];
 128
 129                 return retval.ui;
 130         } else
 131                 return value;
 132 }
 133
 134 #define elf_getu16(swap, value) getu16(swap, value)
 135 #define elf_getu32(swap, value) getu32(swap, value)
 136 #ifdef USE_ARRAY_FOR_64BIT_TYPES
 137 # define elf_getu64(swap, array) \
 138         ((swap ? ((uint64_t)elf_getu32(swap, array[0])) << 32 : elf_getu32(swap, array[0])) + \
 139          (swap ? elf_getu32(swap, array[1]) : ((uint64_t)elf_getu32(swap, array[1]) << 32)))
 140 #else
 141 # define elf_getu64(swap, value) getu64(swap, value)
 142 #endif
 143
 144 #define xsh_addr        (clazz == ELFCLASS32                    \
 145                          ? (void *) &sh32                       \
 146                          : (void *) &sh64)
 147 #define xsh_sizeof      (clazz == ELFCLASS32                    \
 148                          ? sizeof sh32                          \
 149                          : sizeof sh64)
 150 #define xsh_size        (clazz == ELFCLASS32                    \
 151                          ? elf_getu32(swap, sh32.sh_size)       \
 152                          : elf_getu64(swap, sh64.sh_size))
 153 #define xsh_offset      (clazz == ELFCLASS32                    \
 154                          ? elf_getu32(swap, sh32.sh_offset)     \
 155                          : elf_getu64(swap, sh64.sh_offset))
 156 #define xsh_type        (clazz == ELFCLASS32                    \
 157                          ? elf_getu32(swap, sh32.sh_type)       \
 158                          : elf_getu32(swap, sh64.sh_type))
 159 #define xph_addr        (clazz == ELFCLASS32                    \
 160                          ? (void *) &ph32                       \
 161                          : (void *) &ph64)
 162 #define xph_sizeof      (clazz == ELFCLASS32                    \
 163                          ? sizeof ph32                          \
 164                          : sizeof ph64)
 165 #define xph_type        (clazz == ELFCLASS32                    \
 166                          ? elf_getu32(swap, ph32.p_type)        \
 167                          : elf_getu32(swap, ph64.p_type))
 168 #define xph_offset      (off_t)(clazz == ELFCLASS32             \
 169                          ? elf_getu32(swap, ph32.p_offset)      \
 170                          : elf_getu64(swap, ph64.p_offset))
 171 #define xph_align       (size_t)((clazz == ELFCLASS32           \
 172                          ? (off_t) (ph32.p_align ?              \
 173                             elf_getu32(swap, ph32.p_align) : 4) \
 174                          : (off_t) (ph64.p_align ?              \
 175                             elf_getu64(swap, ph64.p_align) : 4)))
 176 #define xph_filesz      (size_t)((clazz == ELFCLASS32           \
 177                          ? elf_getu32(swap, ph32.p_filesz)      \
 178                          : elf_getu64(swap, ph64.p_filesz)))
 179 #define xnh_addr        (clazz == ELFCLASS32                    \
 180                          ? (void *) &nh32                       \
 181                          : (void *) &nh64)
 182 #define xph_memsz       (size_t)((clazz == ELFCLASS32           \
 183                          ? elf_getu32(swap, ph32.p_memsz)       \
 184                          : elf_getu64(swap, ph64.p_memsz)))
 185 #define xnh_sizeof      (clazz == ELFCLASS32                    \
 186                          ? sizeof nh32                          \
 187                          : sizeof nh64)
 188 #define xnh_type        (clazz == ELFCLASS32                    \
 189                          ? elf_getu32(swap, nh32.n_type)        \
 190                          : elf_getu32(swap, nh64.n_type))
 191 #define xnh_namesz      (clazz == ELFCLASS32                    \
 192                          ? elf_getu32(swap, nh32.n_namesz)      \
 193                          : elf_getu32(swap, nh64.n_namesz))
 194 #define xnh_descsz      (clazz == ELFCLASS32                    \
 195                          ? elf_getu32(swap, nh32.n_descsz)      \
 196                          : elf_getu32(swap, nh64.n_descsz))
 197 #define prpsoffsets(i)  (clazz == ELFCLASS32                    \
 198                          ? prpsoffsets32[i]                     \
 199                          : prpsoffsets64[i])
 200 #define xcap_addr       (clazz == ELFCLASS32                    \
 201                          ? (void *) &cap32                      \
 202                          : (void *) &cap64)
 203 #define xcap_sizeof     (clazz == ELFCLASS32                    \
 204                          ? sizeof cap32                         \
 205                          : sizeof cap64)
 206 #define xcap_tag        (clazz == ELFCLASS32                    \
 207                          ? elf_getu32(swap, cap32.c_tag)        \
 208                          : elf_getu64(swap, cap64.c_tag))
 209 #define xcap_val        (clazz == ELFCLASS32                    \
 210                          ? elf_getu32(swap, cap32.c_un.c_val)   \
 211                          : elf_getu64(swap, cap64.c_un.c_val))
 212
 213 #ifdef ELFCORE
 214 /*
 215  * Try larger offsets first to avoid false matches
 216  * from earlier data that happen to look like strings.
 217  */
 218 static const size_t     prpsoffsets32[] = {
 219 #ifdef USE_NT_PSINFO
 220         104,            /* SunOS 5.x (command line) */
 221         88,             /* SunOS 5.x (short name) */
 222 #endif /* USE_NT_PSINFO */
 223
 224         100,            /* SunOS 5.x (command line) */
 225         84,             /* SunOS 5.x (short name) */
 226
 227         44,             /* Linux (command line) */
 228         28,             /* Linux 2.0.36 (short name) */
 229
 230         8,              /* FreeBSD */
 231 };
 232
 233 static const size_t     prpsoffsets64[] = {
 234 #ifdef USE_NT_PSINFO
 235         152,            /* SunOS 5.x (command line) */
 236         136,            /* SunOS 5.x (short name) */
 237 #endif /* USE_NT_PSINFO */
 238
 239         136,            /* SunOS 5.x, 64-bit (command line) */
 240         120,            /* SunOS 5.x, 64-bit (short name) */
 241
 242         56,             /* Linux (command line) */
 243         40,             /* Linux (tested on core from 2.4.x, short name) */
 244
 245         16,             /* FreeBSD, 64-bit */
 246 };
 247
 248 #define NOFFSETS32      (sizeof prpsoffsets32 / sizeof prpsoffsets32[0])
 249 #define NOFFSETS64      (sizeof prpsoffsets64 / sizeof prpsoffsets64[0])
 250
 251 #define NOFFSETS        (clazz == ELFCLASS32 ? NOFFSETS32 : NOFFSETS64)
 252
 253 /*
 254  * Look through the program headers of an executable image, searching
 255  * for a PT_NOTE section of type NT_PRPSINFO, with a name "CORE" or
 256  * "FreeBSD"; if one is found, try looking in various places in its
 257  * contents for a 16-character string containing only printable
 258  * characters - if found, that string should be the name of the program
 259  * that dropped core.  Note: right after that 16-character string is,
 260  * at least in SunOS 5.x (and possibly other SVR4-flavored systems) and
 261  * Linux, a longer string (80 characters, in 5.x, probably other
 262  * SVR4-flavored systems, and Linux) containing the start of the
 263  * command line for that program.
 264  *
 265  * SunOS 5.x core files contain two PT_NOTE sections, with the types
 266  * NT_PRPSINFO (old) and NT_PSINFO (new).  These structs contain the
 267  * same info about the command name and command line, so it probably
 268  * isn't worthwhile to look for NT_PSINFO, but the offsets are provided
 269  * above (see USE_NT_PSINFO), in case we ever decide to do so.  The
 270  * NT_PRPSINFO and NT_PSINFO sections are always in order and adjacent;
 271  * the SunOS 5.x file command relies on this (and prefers the latter).
 272  *
 273  * The signal number probably appears in a section of type NT_PRSTATUS,
 274  * but that's also rather OS-dependent, in ways that are harder to
 275  * dissect with heuristics, so I'm not bothering with the signal number.
 276  * (I suppose the signal number could be of interest in situations where
 277  * you don't have the binary of the program that dropped core; if you
 278  * *do* have that binary, the debugger will probably tell you what
 279  * signal it was.)
 280  */
 281
 282 #define OS_STYLE_SVR4           0
 283 #define OS_STYLE_FREEBSD        1
 284 #define OS_STYLE_NETBSD         2
 285
 286 private const char os_style_names[][8] = {
 287         "SVR4",
 288         "FreeBSD",
 289         "NetBSD",
 290 };
 291
 292 #define FLAGS_DID_CORE          1
 293 #define FLAGS_DID_NOTE          2
 294 #define FLAGS_DID_CORE_STYLE    4
 295
 296 private int
 297 dophn_core(struct magic_set *ms, int clazz, int swap, int fd, off_t off,
 298     int num, size_t size, off_t fsize, int *flags)
 299 {
 300         Elf32_Phdr ph32;
 301         Elf64_Phdr ph64;
 302         size_t offset;
 303         unsigned char nbuf[BUFSIZ];
 304         ssize_t bufsize;
 305         off_t savedoffset;
 306         struct stat st;
 307
 308         if (fstat(fd, &st) < 0) {
 309                 file_badread(ms);
 310                 return -1;
 311         }
 312
 313         if (size != xph_sizeof) {
 314                 if (file_printf(ms, ", corrupted program header size") == -1)
 315                         return -1;
 316                 return 0;
 317         }
 318
 319         /*
 320          * Loop through all the program headers.
 321          */
 322         for ( ; num; num--) {
 323                 if ((savedoffset = lseek(fd, off, SEEK_SET)) == (off_t)-1) {
 324                         file_badseek(ms);
 325                         return -1;
 326                 }
 327                 if (read(fd, xph_addr, xph_sizeof) == -1) {
 328                         file_badread(ms);
 329                         return -1;
 330                 }
 331                 if (xph_offset > fsize) {
 332                         if (lseek(fd, savedoffset, SEEK_SET) == (off_t)-1) {
 333                                 file_badseek(ms);
 334                                 return -1;
 335                         }
 336                         continue;
 337                 }
 338
 339                 off += size;
 340                 if (xph_type != PT_NOTE)
 341                         continue;
 342
 343                 /*
 344                  * This is a PT_NOTE section; loop through all the notes
 345                  * in the section.
 346                  */
 347                 if (lseek(fd, xph_offset, SEEK_SET) == (off_t)-1) {
 348                         file_badseek(ms);
 349                         return -1;
 350                 }
 351                 bufsize = read(fd, nbuf,
 352                     ((xph_filesz < sizeof(nbuf)) ? xph_filesz : sizeof(nbuf)));
 353                 if (bufsize == -1) {
 354                         file_badread(ms);
 355                         return -1;
 356                 }
 357                 offset = 0;
 358                 for (;;) {
 359                         if (offset >= (size_t)bufsize)
 360                                 break;
 361                         offset = donote(ms, nbuf, offset, (size_t)bufsize,
 362                             clazz, swap, 4, flags);
 363                         if (offset == 0)
 364                                 break;
 365
 366                 }
 367         }
 368         return 0;
 369 }
 370 #endif
 371
 372 private size_t
 373 donote(struct magic_set *ms, void *vbuf, size_t offset, size_t size,
 374     int clazz, int swap, size_t align, int *flags)
 375 {
 376         Elf32_Nhdr nh32;
 377         Elf64_Nhdr nh64;
 378         size_t noff, doff;
 379 #ifdef ELFCORE
 380         int os_style = -1;
 381 #endif
 382         uint32_t namesz, descsz;
 383         unsigned char *nbuf = CAST(unsigned char *, vbuf);
 384
 385         (void)memcpy(xnh_addr, &nbuf[offset], xnh_sizeof);
 386         offset += xnh_sizeof;
 387
 388         namesz = xnh_namesz;
 389         descsz = xnh_descsz;
 390         if ((namesz == 0) && (descsz == 0)) {
 391                 /*
 392                  * We're out of note headers.
 393                  */
 394                 return (offset >= size) ? offset : size;
 395         }
 396
 397         if (namesz & 0x80000000) {
 398             (void)file_printf(ms, ", bad note name size 0x%lx",
 399                 (unsigned long)namesz);
 400             return offset;
 401         }
 402
 403         if (descsz & 0x80000000) {
 404             (void)file_printf(ms, ", bad note description size 0x%lx",
 405                 (unsigned long)descsz);
 406             return offset;
 407         }
 408
 409
 410         noff = offset;
 411         doff = ELF_ALIGN(offset + namesz);
 412
 413         if (offset + namesz > size) {
 414                 /*
 415                  * We're past the end of the buffer.
 416                  */
 417                 return doff;
 418         }
 419
 420         offset = ELF_ALIGN(doff + descsz);
 421         if (doff + descsz > size) {
 422                 /*
 423                  * We're past the end of the buffer.
 424                  */
 425                 return (offset >= size) ? offset : size;
 426         }
 427
 428         if (*flags & FLAGS_DID_NOTE)
 429                 goto core;
 430
 431         if (namesz == 4 && strcmp((char *)&nbuf[noff], "GNU") == 0 &&
 432             xnh_type == NT_GNU_VERSION && descsz == 16) {
 433                 uint32_t desc[4];
 434                 (void)memcpy(desc, &nbuf[doff], sizeof(desc));
 435
 436                 if (file_printf(ms, ", for GNU/") == -1)
 437                         return size;
 438                 switch (elf_getu32(swap, desc[0])) {
 439                 case GNU_OS_LINUX:
 440                         if (file_printf(ms, "Linux") == -1)
 441                                 return size;
 442                         break;
 443                 case GNU_OS_HURD:
 444                         if (file_printf(ms, "Hurd") == -1)
 445                                 return size;
 446                         break;
 447                 case GNU_OS_SOLARIS:
 448                         if (file_printf(ms, "Solaris") == -1)
 449                                 return size;
 450                         break;
 451                 case GNU_OS_KFREEBSD:
 452                         if (file_printf(ms, "kFreeBSD") == -1)
 453                                 return size;
 454                         break;
 455                 case GNU_OS_KNETBSD:
 456                         if (file_printf(ms, "kNetBSD") == -1)
 457                                 return size;
 458                         break;
 459                 default:
 460                         if (file_printf(ms, "<unknown>") == -1)
 461                                 return size;
 462                 }
 463                 if (file_printf(ms, " %d.%d.%d", elf_getu32(swap, desc[1]),
 464                     elf_getu32(swap, desc[2]), elf_getu32(swap, desc[3])) == -1)
 465                         return size;
 466                 *flags |= FLAGS_DID_NOTE;
 467                 return size;
 468         }
 469
 470         if (namesz == 7 && strcmp((char *)&nbuf[noff], "NetBSD") == 0 &&
 471             xnh_type == NT_NETBSD_VERSION && descsz == 4) {
 472                 uint32_t desc;
 473                 (void)memcpy(&desc, &nbuf[doff], sizeof(desc));
 474                 desc = elf_getu32(swap, desc);
 475
 476                 if (file_printf(ms, ", for NetBSD") == -1)
 477                         return size;
 478                 /*
 479                  * The version number used to be stuck as 199905, and was thus
 480                  * basically content-free.  Newer versions of NetBSD have fixed
 481                  * this and now use the encoding of __NetBSD_Version__:
 482                  *
 483                  *      MMmmrrpp00
 484                  *
 485                  * M = major version
 486                  * m = minor version
 487                  * r = release ["",A-Z,Z[A-Z] but numeric]
 488                  * p = patchlevel
 489                  */
 490                 if (desc > 100000000U) {
 491                         uint32_t ver_patch = (desc / 100) % 100;
 492                         uint32_t ver_rel = (desc / 10000) % 100;
 493                         uint32_t ver_min = (desc / 1000000) % 100;
 494                         uint32_t ver_maj = desc / 100000000;
 495
 496                         if (file_printf(ms, " %u.%u", ver_maj, ver_min) == -1)
 497                                 return size;
 498                         if (ver_rel == 0 && ver_patch != 0) {
 499                                 if (file_printf(ms, ".%u", ver_patch) == -1)
 500                                         return size;
 501                         } else if (ver_rel != 0) {
 502                                 while (ver_rel > 26) {
 503                                         if (file_printf(ms, "Z") == -1)
 504                                                 return size;
 505                                         ver_rel -= 26;
 506                                 }
 507                                 if (file_printf(ms, "%c", 'A' + ver_rel - 1)
 508                                     == -1)
 509                                         return size;
 510                         }
 511                 }
 512                 *flags |= FLAGS_DID_NOTE;
 513                 return size;
 514         }
 515
 516         if (namesz == 8 && strcmp((char *)&nbuf[noff], "FreeBSD") == 0 &&
 517             xnh_type == NT_FREEBSD_VERSION && descsz == 4) {
 518                 uint32_t desc;
 519                 (void)memcpy(&desc, &nbuf[doff], sizeof(desc));
 520                 desc = elf_getu32(swap, desc);
 521                 if (file_printf(ms, ", for FreeBSD") == -1)
 522                         return size;
 523
 524                 /*
 525                  * Contents is __FreeBSD_version, whose relation to OS
 526                  * versions is defined by a huge table in the Porter's
 527                  * Handbook.  This is the general scheme:
 528                  *
 529                  * Releases:
 530                  *      Mmp000 (before 4.10)
 531                  *      Mmi0p0 (before 5.0)
 532                  *      Mmm0p0
 533                  *
 534                  * Development branches:
 535                  *      Mmpxxx (before 4.6)
 536                  *      Mmp1xx (before 4.10)
 537                  *      Mmi1xx (before 5.0)
 538                  *      M000xx (pre-M.0)
 539                  *      Mmm1xx
 540                  *
 541                  * M = major version
 542                  * m = minor version
 543                  * i = minor version increment (491000 -> 4.10)
 544                  * p = patchlevel
 545                  * x = revision
 546                  *
 547                  * The first release of FreeBSD to use ELF by default
 548                  * was version 3.0.
 549                  */
 550                 if (desc == 460002) {
 551                         if (file_printf(ms, " 4.6.2") == -1)
 552                                 return size;
 553                 } else if (desc < 460100) {
 554                         if (file_printf(ms, " %d.%d", desc / 100000,
 555                             desc / 10000 % 10) == -1)
 556                                 return size;
 557                         if (desc / 1000 % 10 > 0)
 558                                 if (file_printf(ms, ".%d", desc / 1000 % 10)
 559                                     == -1)
 560                                         return size;
 561                         if ((desc % 1000 > 0) || (desc % 100000 == 0))
 562                                 if (file_printf(ms, " (%d)", desc) == -1)
 563                                         return size;
 564                 } else if (desc < 500000) {
 565                         if (file_printf(ms, " %d.%d", desc / 100000,
 566                             desc / 10000 % 10 + desc / 1000 % 10) == -1)
 567                                 return size;
 568                         if (desc / 100 % 10 > 0) {
 569                                 if (file_printf(ms, " (%d)", desc) == -1)
 570                                         return size;
 571                         } else if (desc / 10 % 10 > 0) {
 572                                 if (file_printf(ms, ".%d", desc / 10 % 10)
 573                                     == -1)
 574                                         return size;
 575                         }
 576                 } else {
 577                         if (file_printf(ms, " %d.%d", desc / 100000,
 578                             desc / 1000 % 100) == -1)
 579                                 return size;
 580                         if ((desc / 100 % 10 > 0) ||
 581                             (desc % 100000 / 100 == 0)) {
 582                                 if (file_printf(ms, " (%d)", desc) == -1)
 583                                         return size;
 584                         } else if (desc / 10 % 10 > 0) {
 585                                 if (file_printf(ms, ".%d", desc / 10 % 10)
 586                                     == -1)
 587                                         return size;
 588                         }
 589                 }
 590                 *flags |= FLAGS_DID_NOTE;
 591                 return size;
 592         }
 593
 594         if (namesz == 8 && strcmp((char *)&nbuf[noff], "OpenBSD") == 0 &&
 595             xnh_type == NT_OPENBSD_VERSION && descsz == 4) {
 596                 if (file_printf(ms, ", for OpenBSD") == -1)
 597                         return size;
 598                 /* Content of note is always 0 */
 599                 *flags |= FLAGS_DID_NOTE;
 600                 return size;
 601         }
 602
 603         if (namesz == 10 && strcmp((char *)&nbuf[noff], "DragonFly") == 0 &&
 604             xnh_type == NT_DRAGONFLY_VERSION && descsz == 4) {
 605                 uint32_t desc;
 606                 if (file_printf(ms, ", for DragonFly") == -1)
 607                         return size;
 608                 (void)memcpy(&desc, &nbuf[doff], sizeof(desc));
 609                 desc = elf_getu32(swap, desc);
 610                 if (file_printf(ms, " %d.%d.%d", desc / 100000,
 611                     desc / 10000 % 10, desc % 10000) == -1)
 612                         return size;
 613                 *flags |= FLAGS_DID_NOTE;
 614                 return size;
 615         }
 616
 617 core:
 618         /*
 619          * Sigh.  The 2.0.36 kernel in Debian 2.1, at
 620          * least, doesn't correctly implement name
 621          * sections, in core dumps, as specified by
 622          * the "Program Linking" section of "UNIX(R) System
 623          * V Release 4 Programmer's Guide: ANSI C and
 624          * Programming Support Tools", because my copy
 625          * clearly says "The first 'namesz' bytes in 'name'
 626          * contain a *null-terminated* [emphasis mine]
 627          * character representation of the entry's owner
 628          * or originator", but the 2.0.36 kernel code
 629          * doesn't include the terminating null in the
 630          * name....
 631          */
 632         if ((namesz == 4 && strncmp((char *)&nbuf[noff], "CORE", 4) == 0) ||
 633             (namesz == 5 && strcmp((char *)&nbuf[noff], "CORE") == 0)) {
 634                 os_style = OS_STYLE_SVR4;
 635         }
 636
 637         if ((namesz == 8 && strcmp((char *)&nbuf[noff], "FreeBSD") == 0)) {
 638                 os_style = OS_STYLE_FREEBSD;
 639         }
 640
 641         if ((namesz >= 11 && strncmp((char *)&nbuf[noff], "NetBSD-CORE", 11)
 642             == 0)) {
 643                 os_style = OS_STYLE_NETBSD;
 644         }
 645
 646 #ifdef ELFCORE
 647         if ((*flags & FLAGS_DID_CORE) != 0)
 648                 return size;
 649
 650         if (os_style != -1 && (*flags & FLAGS_DID_CORE_STYLE) == 0) {
 651                 if (file_printf(ms, ", %s-style", os_style_names[os_style])
 652                     == -1)
 653                         return size;
 654                 *flags |= FLAGS_DID_CORE_STYLE;
 655         }
 656
 657         switch (os_style) {
 658         case OS_STYLE_NETBSD:
 659                 if (xnh_type == NT_NETBSD_CORE_PROCINFO) {
 660                         uint32_t signo;
 661                         /*
 662                          * Extract the program name.  It is at
 663                          * offset 0x7c, and is up to 32-bytes,
 664                          * including the terminating NUL.
 665                          */
 666                         if (file_printf(ms, ", from '%.31s'",
 667                             &nbuf[doff + 0x7c]) == -1)
 668                                 return size;
 669
 670                         /*
 671                          * Extract the signal number.  It is at
 672                          * offset 0x08.
 673                          */
 674                         (void)memcpy(&signo, &nbuf[doff + 0x08],
 675                             sizeof(signo));
 676                         if (file_printf(ms, " (signal %u)",
 677                             elf_getu32(swap, signo)) == -1)
 678                                 return size;
 679                         *flags |= FLAGS_DID_CORE;
 680                         return size;
 681                 }
 682                 break;
 683
 684         default:
 685                 if (xnh_type == NT_PRPSINFO) {
 686                         size_t i, j;
 687                         unsigned char c;
 688                         /*
 689                          * Extract the program name.  We assume
 690                          * it to be 16 characters (that's what it
 691                          * is in SunOS 5.x and Linux).
 692                          *
 693                          * Unfortunately, it's at a different offset
 694                          * in various OSes, so try multiple offsets.
 695                          * If the characters aren't all printable,
 696                          * reject it.
 697                          */
 698                         for (i = 0; i < NOFFSETS; i++) {
 699                                 unsigned char *cname, *cp;
 700                                 size_t reloffset = prpsoffsets(i);
 701                                 size_t noffset = doff + reloffset;
 702                                 for (j = 0; j < 16; j++, noffset++,
 703                                     reloffset++) {
 704                                         /*
 705                                          * Make sure we're not past
 706                                          * the end of the buffer; if
 707                                          * we are, just give up.
 708                                          */
 709                                         if (noffset >= size)
 710                                                 goto tryanother;
 711
 712                                         /*
 713                                          * Make sure we're not past
 714                                          * the end of the contents;
 715                                          * if we are, this obviously
 716                                          * isn't the right offset.
 717                                          */
 718                                         if (reloffset >= descsz)
 719                                                 goto tryanother;
 720
 721                                         c = nbuf[noffset];
 722                                         if (c == '\0') {
 723                                                 /*
 724                                                  * A '\0' at the
 725                                                  * beginning is
 726                                                  * obviously wrong.
 727                                                  * Any other '\0'
 728                                                  * means we're done.
 729                                                  */
 730                                                 if (j == 0)
 731                                                         goto tryanother;
 732                                                 else
 733                                                         break;
 734                                         } else {
 735                                                 /*
 736                                                  * A nonprintable
 737                                                  * character is also
 738                                                  * wrong.
 739                                                  */
 740                                                 if (!isprint(c) || isquote(c))
 741                                                         goto tryanother;
 742                                         }
 743                                 }
 744                                 /*
 745                                  * Well, that worked.
 746                                  */
 747                                 cname = (unsigned char *)
 748                                     &nbuf[doff + prpsoffsets(i)];
 749                                 for (cp = cname; *cp && isprint(*cp); cp++)
 750                                         continue;
 751                                 /*
 752                                  * Linux apparently appends a space at the end
 753                                  * of the command line: remove it.
 754                                  */
 755                                 while (cp > cname && isspace(cp[-1]))
 756                                         cp--;
 757                                 if (file_printf(ms, ", from '%.*s'",
 758                                     (int)(cp - cname), cname) == -1)
 759                                         return size;
 760                                 *flags |= FLAGS_DID_CORE;
 761                                 return size;
 762
 763                         tryanother:
 764                                 ;
 765                         }
 766                 }
 767                 break;
 768         }
 769 #endif
 770         return offset;
 771 }
 772
 773 /* SunOS 5.x hardware capability descriptions */
 774 typedef struct cap_desc {
 775         uint64_t cd_mask;
 776         const char *cd_name;
 777 } cap_desc_t;
 778
 779 static const cap_desc_t cap_desc_sparc[] = {
 780         { AV_SPARC_MUL32,               "MUL32" },
 781         { AV_SPARC_DIV32,               "DIV32" },
 782         { AV_SPARC_FSMULD,              "FSMULD" },
 783         { AV_SPARC_V8PLUS,              "V8PLUS" },
 784         { AV_SPARC_POPC,                "POPC" },
 785         { AV_SPARC_VIS,                 "VIS" },
 786         { AV_SPARC_VIS2,                "VIS2" },
 787         { AV_SPARC_ASI_BLK_INIT,        "ASI_BLK_INIT" },
 788         { AV_SPARC_FMAF,                "FMAF" },
 789         { AV_SPARC_FJFMAU,              "FJFMAU" },
 790         { AV_SPARC_IMA,                 "IMA" },
 791         { 0, NULL }
 792 };
 793
 794 static const cap_desc_t cap_desc_386[] = {
 795         { AV_386_FPU,                   "FPU" },
 796         { AV_386_TSC,                   "TSC" },
 797         { AV_386_CX8,                   "CX8" },
 798         { AV_386_SEP,                   "SEP" },
 799         { AV_386_AMD_SYSC,              "AMD_SYSC" },
 800         { AV_386_CMOV,                  "CMOV" },
 801         { AV_386_MMX,                   "MMX" },
 802         { AV_386_AMD_MMX,               "AMD_MMX" },
 803         { AV_386_AMD_3DNow,             "AMD_3DNow" },
 804         { AV_386_AMD_3DNowx,            "AMD_3DNowx" },
 805         { AV_386_FXSR,                  "FXSR" },
 806         { AV_386_SSE,                   "SSE" },
 807         { AV_386_SSE2,                  "SSE2" },
 808         { AV_386_PAUSE,                 "PAUSE" },
 809         { AV_386_SSE3,                  "SSE3" },
 810         { AV_386_MON,                   "MON" },
 811         { AV_386_CX16,                  "CX16" },
 812         { AV_386_AHF,                   "AHF" },
 813         { AV_386_TSCP,                  "TSCP" },
 814         { AV_386_AMD_SSE4A,             "AMD_SSE4A" },
 815         { AV_386_POPCNT,                "POPCNT" },
 816         { AV_386_AMD_LZCNT,             "AMD_LZCNT" },
 817         { AV_386_SSSE3,                 "SSSE3" },
 818         { AV_386_SSE4_1,                "SSE4.1" },
 819         { AV_386_SSE4_2,                "SSE4.2" },
 820         { 0, NULL }
 821 };
 822
 823 private int
 824 doshn(struct magic_set *ms, int clazz, int swap, int fd, off_t off, int num,
 825     size_t size, int *flags, int mach)
 826 {
 827         Elf32_Shdr sh32;
 828         Elf64_Shdr sh64;
 829         int stripped = 1;
 830         void *nbuf;
 831         off_t noff;
 832         uint64_t cap_hw1 = 0;   /* SunOS 5.x hardware capabilites */
 833         uint64_t cap_sf1 = 0;   /* SunOS 5.x software capabilites */
 834
 835         if (size != xsh_sizeof) {
 836                 if (file_printf(ms, ", corrupted section header size") == -1)
 837                         return -1;
 838                 return 0;
 839         }
 840
 841         if (lseek(fd, off, SEEK_SET) == (off_t)-1) {
 842                 file_badseek(ms);
 843                 return -1;
 844         }
 845
 846         for ( ; num; num--) {
 847                 if (read(fd, xsh_addr, xsh_sizeof) == -1) {
 848                         file_badread(ms);
 849                         return -1;
 850                 }
 851                 switch (xsh_type) {
 852                 case SHT_SYMTAB:
 853 #if 0
 854                 case SHT_DYNSYM:
 855 #endif
 856                         stripped = 0;
 857                         break;
 858                 case SHT_NOTE:
 859                         if ((off = lseek(fd, (off_t)0, SEEK_CUR)) ==
 860                             (off_t)-1) {
 861                                 file_badread(ms);
 862                                 return -1;
 863                         }
 864                         if ((nbuf = malloc((size_t)xsh_size)) == NULL) {
 865                                 file_error(ms, errno, "Cannot allocate memory"
 866                                     " for note");
 867                                 return -1;
 868                         }
 869                         if ((noff = lseek(fd, (off_t)xsh_offset, SEEK_SET)) ==
 870                             (off_t)-1) {
 871                                 file_badread(ms);
 872                                 free(nbuf);
 873                                 return -1;
 874                         }
 875                         if (read(fd, nbuf, (size_t)xsh_size) !=
 876                             (ssize_t)xsh_size) {
 877                                 free(nbuf);
 878                                 file_badread(ms);
 879                                 return -1;
 880                         }
 881
 882                         noff = 0;
 883                         for (;;) {
 884                                 if (noff >= (off_t)xsh_size)
 885                                         break;
 886                                 noff = donote(ms, nbuf, (size_t)noff,
 887                                     (size_t)xsh_size, clazz, swap, 4,
 888                                     flags);
 889                                 if (noff == 0)
 890                                         break;
 891                         }
 892                         if ((lseek(fd, off, SEEK_SET)) == (off_t)-1) {
 893                                 free(nbuf);
 894                                 file_badread(ms);
 895                                 return -1;
 896                         }
 897                         free(nbuf);
 898                         break;
 899                 case SHT_SUNW_cap:
 900                     {
 901                         off_t coff;
 902                         if ((off = lseek(fd, (off_t)0, SEEK_CUR)) ==
 903                             (off_t)-1) {
 904                                 file_badread(ms);
 905                                 return -1;
 906                         }
 907                         if (lseek(fd, (off_t)xsh_offset, SEEK_SET) ==
 908                             (off_t)-1) {
 909                                 file_badread(ms);
 910                                 return -1;
 911                         }
 912                         coff = 0;
 913                         for (;;) {
 914                                 Elf32_Cap cap32;
 915                                 Elf64_Cap cap64;
 916                                 char cbuf[/*CONSTCOND*/
 917                                     MAX(sizeof cap32, sizeof cap64)];
 918                                 if ((coff += xcap_sizeof) >= (off_t)xsh_size)
 919                                         break;
 920                                 if (read(fd, cbuf, (size_t)xcap_sizeof) !=
 921                                     (ssize_t)xcap_sizeof) {
 922                                         file_badread(ms);
 923                                         return -1;
 924                                 }
 925                                 (void)memcpy(xcap_addr, cbuf, xcap_sizeof);
 926                                 switch (xcap_tag) {
 927                                 case CA_SUNW_NULL:
 928                                         break;
 929                                 case CA_SUNW_HW_1:
 930                                         cap_hw1 |= xcap_val;
 931                                         break;
 932                                 case CA_SUNW_SF_1:
 933                                         cap_sf1 |= xcap_val;
 934                                         break;
 935                                 default:
 936                                         if (file_printf(ms,
 937                                             ", with unknown capability "
 938                                             "0x%llx = 0x%llx",
 939                                             (unsigned long long)xcap_tag,
 940                                             (unsigned long long)xcap_val) == -1)
 941                                                 return -1;
 942                                         break;
 943                                 }
 944                         }
 945                         if (lseek(fd, off, SEEK_SET) == (off_t)-1) {
 946                                 file_badread(ms);
 947                                 return -1;
 948                         }
 949                         break;
 950                     }
 951                 }
 952         }
 953         if (file_printf(ms, ", %sstripped", stripped ? "" : "not ") == -1)
 954                 return -1;
 955         if (cap_hw1) {
 956                 const cap_desc_t *cdp;
 957                 switch (mach) {
 958                 case EM_SPARC:
 959                 case EM_SPARC32PLUS:
 960                 case EM_SPARCV9:
 961                         cdp = cap_desc_sparc;
 962                         break;
 963                 case EM_386:
 964                 case EM_IA_64:
 965                 case EM_AMD64:
 966                         cdp = cap_desc_386;
 967                         break;
 968                 default:
 969                         cdp = NULL;
 970                         break;
 971                 }
 972                 if (file_printf(ms, ", uses") == -1)
 973                         return -1;
 974                 if (cdp) {
 975                         while (cdp->cd_name) {
 976                                 if (cap_hw1 & cdp->cd_mask) {
 977                                         if (file_printf(ms,
 978                                             " %s", cdp->cd_name) == -1)
 979                                                 return -1;
 980                                         cap_hw1 &= ~cdp->cd_mask;
 981                                 }
 982                                 ++cdp;
 983                         }
 984                         if (cap_hw1)
 985                                 if (file_printf(ms,
 986                                     " unknown hardware capability 0x%llx",
 987                                     (unsigned long long)cap_hw1) == -1)
 988                                         return -1;
 989                 } else {
 990                         if (file_printf(ms,
 991                             " hardware capability 0x%llx",
 992                             (unsigned long long)cap_hw1) == -1)
 993                                 return -1;
 994                 }
 995         }
 996         if (cap_sf1) {
 997                 if (cap_sf1 & SF1_SUNW_FPUSED) {
 998                         if (file_printf(ms,
 999                             (cap_sf1 & SF1_SUNW_FPKNWN)
1000                             ? ", uses frame pointer"
1001                             : ", not known to use frame pointer") == -1)
1002                                 return -1;
1003                 }
1004                 cap_sf1 &= ~SF1_SUNW_MASK;
1005                 if (cap_sf1)
1006                         if (file_printf(ms,
1007                             ", with unknown software capability 0x%llx",
1008                             (unsigned long long)cap_sf1) == -1)
1009                                 return -1;
1010         }
1011         return 0;
1012 }
1013
1014 /*
1015  * Look through the program headers of an executable image, searching
1016  * for a PT_INTERP section; if one is found, it's dynamically linked,
1017  * otherwise it's statically linked.
1018  */
1019 private int
1020 dophn_exec(struct magic_set *ms, int clazz, int swap, int fd, off_t off,
1021     int num, size_t size, off_t fsize, int *flags, int sh_num)
1022 {
1023         Elf32_Phdr ph32;
1024         Elf64_Phdr ph64;
1025         const char *linking_style = "statically";
1026         const char *shared_libraries = "";
1027         unsigned char nbuf[BUFSIZ];
1028         ssize_t bufsize;
1029         size_t offset, align;
1030         off_t savedoffset = (off_t)-1;
1031         struct stat st;
1032
1033         if (fstat(fd, &st) < 0) {
1034                 file_badread(ms);
1035                 return -1;
1036         }
1037
1038         if (size != xph_sizeof) {
1039                 if (file_printf(ms, ", corrupted program header size") == -1)
1040                         return -1;
1041                 return 0;
1042         }
1043
1044         if (lseek(fd, off, SEEK_SET) == (off_t)-1) {
1045                 file_badseek(ms);
1046                 return -1;
1047         }
1048
1049         for ( ; num; num--) {
1050                 if (read(fd, xph_addr, xph_sizeof) == -1) {
1051                         file_badread(ms);
1052                         return -1;
1053                 }
1054                 if (xph_offset > st.st_size && savedoffset != (off_t)-1) {
1055                         if (lseek(fd, savedoffset, SEEK_SET) == (off_t)-1) {
1056                                 file_badseek(ms);
1057                                 return -1;
1058                         }
1059                         continue;
1060                 }
1061
1062                 if ((savedoffset = lseek(fd, (off_t)0, SEEK_CUR)) == (off_t)-1) {
1063                         file_badseek(ms);
1064                         return -1;
1065                 }
1066
1067                 if (xph_offset > fsize) {
1068                         if (lseek(fd, savedoffset, SEEK_SET) == (off_t)-1) {
1069                                 file_badseek(ms);
1070                                 return -1;
1071                         }
1072                         continue;
1073                 }
1074
1075                 switch (xph_type) {
1076                 case PT_DYNAMIC:
1077                         linking_style = "dynamically";
1078                         break;
1079                 case PT_INTERP:
1080                         shared_libraries = " (uses shared libs)";
1081                         break;
1082                 case PT_NOTE:
1083                         if ((align = xph_align) & 0x80000000UL) {
1084                                 if (file_printf(ms,
1085                                     ", invalid note alignment 0x%lx",
1086                                     (unsigned long)align) == -1)
1087                                         return -1;
1088                                 align = 4;
1089                         }
1090                         if (sh_num)
1091                                 break;
1092                         /*
1093                          * This is a PT_NOTE section; loop through all the notes
1094                          * in the section.
1095                          */
1096                         if (lseek(fd, xph_offset, SEEK_SET)
1097                             == (off_t)-1) {
1098                                 file_badseek(ms);
1099                                 return -1;
1100                         }
1101                         bufsize = read(fd, nbuf, ((xph_filesz < sizeof(nbuf)) ?
1102                             xph_filesz : sizeof(nbuf)));
1103                         if (bufsize == -1) {
1104                                 file_badread(ms);
1105                                 return -1;
1106                         }
1107                         offset = 0;
1108                         for (;;) {
1109                                 if (offset >= (size_t)bufsize)
1110                                         break;
1111                                 offset = donote(ms, nbuf, offset,
1112                                     (size_t)bufsize, clazz, swap, align,
1113                                     flags);
1114                                 if (offset == 0)
1115                                         break;
1116                         }
1117                         if (lseek(fd, savedoffset, SEEK_SET) == (off_t)-1) {
1118                                 file_badseek(ms);
1119                                 return -1;
1120                         }
1121                         break;
1122                 default:
1123                         break;
1124                 }
1125         }
1126         if (file_printf(ms, ", %s linked%s", linking_style, shared_libraries)
1127             == -1)
1128             return -1;
1129         return 0;
1130 }
1131
1132
1133 protected int
1134 file_tryelf(struct magic_set *ms, int fd, const unsigned char *buf,
1135     size_t nbytes)
1136 {
1137         union {
1138                 int32_t l;
1139                 char c[sizeof (int32_t)];
1140         } u;
1141         int clazz;
1142         int swap;
1143         struct stat st;
1144         off_t fsize;
1145         int flags = 0;
1146         Elf32_Ehdr elf32hdr;
1147         Elf64_Ehdr elf64hdr;
1148         uint16_t type;
1149
1150         if (ms->flags & (MAGIC_MIME|MAGIC_APPLE))
1151                 return 0;
1152         /*
1153          * ELF executables have multiple section headers in arbitrary
1154          * file locations and thus file(1) cannot determine it from easily.
1155          * Instead we traverse thru all section headers until a symbol table
1156          * one is found or else the binary is stripped.
1157          * Return immediately if it's not ELF (so we avoid pipe2file unless needed).
1158          */
1159         if (buf[EI_MAG0] != ELFMAG0
1160             || (buf[EI_MAG1] != ELFMAG1 && buf[EI_MAG1] != OLFMAG1)
1161             || buf[EI_MAG2] != ELFMAG2 || buf[EI_MAG3] != ELFMAG3)
1162                 return 0;
1163
1164         /*
1165          * If we cannot seek, it must be a pipe, socket or fifo.
1166          */
1167         if((lseek(fd, (off_t)0, SEEK_SET) == (off_t)-1) && (errno == ESPIPE))
1168                 fd = file_pipe2file(ms, fd, buf, nbytes);
1169
1170         if (fstat(fd, &st) == -1) {
1171                 file_badread(ms);
1172                 return -1;
1173         }
1174         fsize = st.st_size;
1175
1176         clazz = buf[EI_CLASS];
1177
1178         switch (clazz) {
1179         case ELFCLASS32:
1180 #undef elf_getu
1181 #define elf_getu(a, b)  elf_getu32(a, b)
1182 #undef elfhdr
1183 #define elfhdr elf32hdr
1184 #include "elfclass.h"
1185         case ELFCLASS64:
1186 #undef elf_getu
1187 #define elf_getu(a, b)  elf_getu64(a, b)
1188 #undef elfhdr
1189 #define elfhdr elf64hdr
1190 #include "elfclass.h"
1191         default:
1192             if (file_printf(ms, ", unknown class %d", clazz) == -1)
1193                     return -1;
1194             break;
1195         }
1196         return 0;
1197 }
1198 #endif