contrib/file/src/readelf.c

   1 /*
   2  * Copyright (c) Christos Zoulas 2003.
   3  * All Rights Reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice immediately at the beginning of the file, without modification,
  10  *    this list of conditions, and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  18  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
  19  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  25  * SUCH DAMAGE.
  26  */
  27 #include "file.h"
  28
  29 #ifndef lint
  30 FILE_RCSID("@(#)$File: readelf.c,v 1.141 2018/04/12 16:50:52 christos Exp $")
  31 #endif
  32
  33 #ifdef BUILTIN_ELF
  34 #include <string.h>
  35 #include <ctype.h>
  36 #include <stdlib.h>
  37 #ifdef HAVE_UNISTD_H
  38 #include <unistd.h>
  39 #endif
  40
  41 #include "readelf.h"
  42 #include "magic.h"
  43
  44 #ifdef  ELFCORE
  45 private int dophn_core(struct magic_set *, int, int, int, off_t, int, size_t,
  46     off_t, int *, uint16_t *);
  47 #endif
  48 private int dophn_exec(struct magic_set *, int, int, int, off_t, int, size_t,
  49     off_t, int, int *, uint16_t *);
  50 private int doshn(struct magic_set *, int, int, int, off_t, int, size_t,
  51     off_t, int, int, int *, uint16_t *);
  52 private size_t donote(struct magic_set *, void *, size_t, size_t, int,
  53     int, size_t, int *, uint16_t *, int, off_t, int, off_t);
  54
  55 #define ELF_ALIGN(a)    ((((a) + align - 1) / align) * align)
  56
  57 #define isquote(c) (strchr("'\"`", (c)) != NULL)
  58
  59 private uint16_t getu16(int, uint16_t);
  60 private uint32_t getu32(int, uint32_t);
  61 private uint64_t getu64(int, uint64_t);
  62
  63 #define MAX_PHNUM       128
  64 #define MAX_SHNUM       32768
  65 #define SIZE_UNKNOWN    ((off_t)-1)
  66
  67 private int
  68 toomany(struct magic_set *ms, const char *name, uint16_t num)
  69 {
  70         if (file_printf(ms, ", too many %s (%u)", name, num
  71             ) == -1)
  72                 return -1;
  73         return 0;
  74 }
  75
  76 private uint16_t
  77 getu16(int swap, uint16_t value)
  78 {
  79         union {
  80                 uint16_t ui;
  81                 char c[2];
  82         } retval, tmpval;
  83
  84         if (swap) {
  85                 tmpval.ui = value;
  86
  87                 retval.c[0] = tmpval.c[1];
  88                 retval.c[1] = tmpval.c[0];
  89
  90                 return retval.ui;
  91         } else
  92                 return value;
  93 }
  94
  95 private uint32_t
  96 getu32(int swap, uint32_t value)
  97 {
  98         union {
  99                 uint32_t ui;
 100                 char c[4];
 101         } retval, tmpval;
 102
 103         if (swap) {
 104                 tmpval.ui = value;
 105
 106                 retval.c[0] = tmpval.c[3];
 107                 retval.c[1] = tmpval.c[2];
 108                 retval.c[2] = tmpval.c[1];
 109                 retval.c[3] = tmpval.c[0];
 110
 111                 return retval.ui;
 112         } else
 113                 return value;
 114 }
 115
 116 private uint64_t
 117 getu64(int swap, uint64_t value)
 118 {
 119         union {
 120                 uint64_t ui;
 121                 char c[8];
 122         } retval, tmpval;
 123
 124         if (swap) {
 125                 tmpval.ui = value;
 126
 127                 retval.c[0] = tmpval.c[7];
 128                 retval.c[1] = tmpval.c[6];
 129                 retval.c[2] = tmpval.c[5];
 130                 retval.c[3] = tmpval.c[4];
 131                 retval.c[4] = tmpval.c[3];
 132                 retval.c[5] = tmpval.c[2];
 133                 retval.c[6] = tmpval.c[1];
 134                 retval.c[7] = tmpval.c[0];
 135
 136                 return retval.ui;
 137         } else
 138                 return value;
 139 }
 140
 141 #define elf_getu16(swap, value) getu16(swap, value)
 142 #define elf_getu32(swap, value) getu32(swap, value)
 143 #define elf_getu64(swap, value) getu64(swap, value)
 144
 145 #define xsh_addr        (clazz == ELFCLASS32                    \
 146                          ? (void *)&sh32                        \
 147                          : (void *)&sh64)
 148 #define xsh_sizeof      (clazz == ELFCLASS32                    \
 149                          ? sizeof(sh32)                         \
 150                          : sizeof(sh64))
 151 #define xsh_size        (size_t)(clazz == ELFCLASS32            \
 152                          ? elf_getu32(swap, sh32.sh_size)       \
 153                          : elf_getu64(swap, sh64.sh_size))
 154 #define xsh_offset      (off_t)(clazz == ELFCLASS32             \
 155                          ? elf_getu32(swap, sh32.sh_offset)     \
 156                          : elf_getu64(swap, sh64.sh_offset))
 157 #define xsh_type        (clazz == ELFCLASS32                    \
 158                          ? elf_getu32(swap, sh32.sh_type)       \
 159                          : elf_getu32(swap, sh64.sh_type))
 160 #define xsh_name        (clazz == ELFCLASS32                    \
 161                          ? elf_getu32(swap, sh32.sh_name)       \
 162                          : elf_getu32(swap, sh64.sh_name))
 163 #define xph_addr        (clazz == ELFCLASS32                    \
 164                          ? (void *) &ph32                       \
 165                          : (void *) &ph64)
 166 #define xph_sizeof      (clazz == ELFCLASS32                    \
 167                          ? sizeof(ph32)                         \
 168                          : sizeof(ph64))
 169 #define xph_type        (clazz == ELFCLASS32                    \
 170                          ? elf_getu32(swap, ph32.p_type)        \
 171                          : elf_getu32(swap, ph64.p_type))
 172 #define xph_offset      (off_t)(clazz == ELFCLASS32             \
 173                          ? elf_getu32(swap, ph32.p_offset)      \
 174                          : elf_getu64(swap, ph64.p_offset))
 175 #define xph_align       (size_t)((clazz == ELFCLASS32           \
 176                          ? (off_t) (ph32.p_align ?              \
 177                             elf_getu32(swap, ph32.p_align) : 4) \
 178                          : (off_t) (ph64.p_align ?              \
 179                             elf_getu64(swap, ph64.p_align) : 4)))
 180 #define xph_vaddr       (size_t)((clazz == ELFCLASS32           \
 181                          ? (off_t) (ph32.p_vaddr ?              \
 182                             elf_getu32(swap, ph32.p_vaddr) : 4) \
 183                          : (off_t) (ph64.p_vaddr ?              \
 184                             elf_getu64(swap, ph64.p_vaddr) : 4)))
 185 #define xph_filesz      (size_t)((clazz == ELFCLASS32           \
 186                          ? elf_getu32(swap, ph32.p_filesz)      \
 187                          : elf_getu64(swap, ph64.p_filesz)))
 188 #define xnh_addr        (clazz == ELFCLASS32                    \
 189                          ? (void *)&nh32                        \
 190                          : (void *)&nh64)
 191 #define xph_memsz       (size_t)((clazz == ELFCLASS32           \
 192                          ? elf_getu32(swap, ph32.p_memsz)       \
 193                          : elf_getu64(swap, ph64.p_memsz)))
 194 #define xnh_sizeof      (clazz == ELFCLASS32                    \
 195                          ? sizeof(nh32)                         \
 196                          : sizeof(nh64))
 197 #define xnh_type        (clazz == ELFCLASS32                    \
 198                          ? elf_getu32(swap, nh32.n_type)        \
 199                          : elf_getu32(swap, nh64.n_type))
 200 #define xnh_namesz      (clazz == ELFCLASS32                    \
 201                          ? elf_getu32(swap, nh32.n_namesz)      \
 202                          : elf_getu32(swap, nh64.n_namesz))
 203 #define xnh_descsz      (clazz == ELFCLASS32                    \
 204                          ? elf_getu32(swap, nh32.n_descsz)      \
 205                          : elf_getu32(swap, nh64.n_descsz))
 206 #define prpsoffsets(i)  (clazz == ELFCLASS32                    \
 207                          ? prpsoffsets32[i]                     \
 208                          : prpsoffsets64[i])
 209 #define xcap_addr       (clazz == ELFCLASS32                    \
 210                          ? (void *)&cap32                       \
 211                          : (void *)&cap64)
 212 #define xcap_sizeof     (clazz == ELFCLASS32                    \
 213                          ? sizeof cap32                         \
 214                          : sizeof cap64)
 215 #define xcap_tag        (clazz == ELFCLASS32                    \
 216                          ? elf_getu32(swap, cap32.c_tag)        \
 217                          : elf_getu64(swap, cap64.c_tag))
 218 #define xcap_val        (clazz == ELFCLASS32                    \
 219                          ? elf_getu32(swap, cap32.c_un.c_val)   \
 220                          : elf_getu64(swap, cap64.c_un.c_val))
 221 #define xauxv_addr      (clazz == ELFCLASS32                    \
 222                          ? (void *)&auxv32                      \
 223                          : (void *)&auxv64)
 224 #define xauxv_sizeof    (clazz == ELFCLASS32                    \
 225                          ? sizeof(auxv32)                       \
 226                          : sizeof(auxv64))
 227 #define xauxv_type      (clazz == ELFCLASS32                    \
 228                          ? elf_getu32(swap, auxv32.a_type)      \
 229                          : elf_getu64(swap, auxv64.a_type))
 230 #define xauxv_val       (clazz == ELFCLASS32                    \
 231                          ? elf_getu32(swap, auxv32.a_v)         \
 232                          : elf_getu64(swap, auxv64.a_v))
 233
 234 #ifdef ELFCORE
 235 /*
 236  * Try larger offsets first to avoid false matches
 237  * from earlier data that happen to look like strings.
 238  */
 239 static const size_t     prpsoffsets32[] = {
 240 #ifdef USE_NT_PSINFO
 241         104,            /* SunOS 5.x (command line) */
 242         88,             /* SunOS 5.x (short name) */
 243 #endif /* USE_NT_PSINFO */
 244
 245         100,            /* SunOS 5.x (command line) */
 246         84,             /* SunOS 5.x (short name) */
 247
 248         44,             /* Linux (command line) */
 249         28,             /* Linux 2.0.36 (short name) */
 250
 251         8,              /* FreeBSD */
 252 };
 253
 254 static const size_t     prpsoffsets64[] = {
 255 #ifdef USE_NT_PSINFO
 256         152,            /* SunOS 5.x (command line) */
 257         136,            /* SunOS 5.x (short name) */
 258 #endif /* USE_NT_PSINFO */
 259
 260         136,            /* SunOS 5.x, 64-bit (command line) */
 261         120,            /* SunOS 5.x, 64-bit (short name) */
 262
 263         56,             /* Linux (command line) */
 264         40,             /* Linux (tested on core from 2.4.x, short name) */
 265
 266         16,             /* FreeBSD, 64-bit */
 267 };
 268
 269 #define NOFFSETS32      (sizeof prpsoffsets32 / sizeof prpsoffsets32[0])
 270 #define NOFFSETS64      (sizeof prpsoffsets64 / sizeof prpsoffsets64[0])
 271
 272 #define NOFFSETS        (clazz == ELFCLASS32 ? NOFFSETS32 : NOFFSETS64)
 273
 274 /*
 275  * Look through the program headers of an executable image, searching
 276  * for a PT_NOTE section of type NT_PRPSINFO, with a name "CORE" or
 277  * "FreeBSD"; if one is found, try looking in various places in its
 278  * contents for a 16-character string containing only printable
 279  * characters - if found, that string should be the name of the program
 280  * that dropped core.  Note: right after that 16-character string is,
 281  * at least in SunOS 5.x (and possibly other SVR4-flavored systems) and
 282  * Linux, a longer string (80 characters, in 5.x, probably other
 283  * SVR4-flavored systems, and Linux) containing the start of the
 284  * command line for that program.
 285  *
 286  * SunOS 5.x core files contain two PT_NOTE sections, with the types
 287  * NT_PRPSINFO (old) and NT_PSINFO (new).  These structs contain the
 288  * same info about the command name and command line, so it probably
 289  * isn't worthwhile to look for NT_PSINFO, but the offsets are provided
 290  * above (see USE_NT_PSINFO), in case we ever decide to do so.  The
 291  * NT_PRPSINFO and NT_PSINFO sections are always in order and adjacent;
 292  * the SunOS 5.x file command relies on this (and prefers the latter).
 293  *
 294  * The signal number probably appears in a section of type NT_PRSTATUS,
 295  * but that's also rather OS-dependent, in ways that are harder to
 296  * dissect with heuristics, so I'm not bothering with the signal number.
 297  * (I suppose the signal number could be of interest in situations where
 298  * you don't have the binary of the program that dropped core; if you
 299  * *do* have that binary, the debugger will probably tell you what
 300  * signal it was.)
 301  */
 302
 303 #define OS_STYLE_SVR4           0
 304 #define OS_STYLE_FREEBSD        1
 305 #define OS_STYLE_NETBSD         2
 306
 307 private const char os_style_names[][8] = {
 308         "SVR4",
 309         "FreeBSD",
 310         "NetBSD",
 311 };
 312
 313 #define FLAGS_CORE_STYLE                0x0003
 314
 315 #define FLAGS_DID_CORE                  0x0004
 316 #define FLAGS_DID_OS_NOTE               0x0008
 317 #define FLAGS_DID_BUILD_ID              0x0010
 318 #define FLAGS_DID_CORE_STYLE            0x0020
 319 #define FLAGS_DID_NETBSD_PAX            0x0040
 320 #define FLAGS_DID_NETBSD_MARCH          0x0080
 321 #define FLAGS_DID_NETBSD_CMODEL         0x0100
 322 #define FLAGS_DID_NETBSD_EMULATION      0x0200
 323 #define FLAGS_DID_NETBSD_UNKNOWN        0x0400
 324 #define FLAGS_IS_CORE                   0x0800
 325 #define FLAGS_DID_AUXV                  0x1000
 326
 327 private int
 328 dophn_core(struct magic_set *ms, int clazz, int swap, int fd, off_t off,
 329     int num, size_t size, off_t fsize, int *flags, uint16_t *notecount)
 330 {
 331         Elf32_Phdr ph32;
 332         Elf64_Phdr ph64;
 333         size_t offset, len;
 334         unsigned char nbuf[BUFSIZ];
 335         ssize_t bufsize;
 336         off_t ph_off = off;
 337         int ph_num = num;
 338
 339         if (size != xph_sizeof) {
 340                 if (file_printf(ms, ", corrupted program header size") == -1)
 341                         return -1;
 342                 return 0;
 343         }
 344
 345         /*
 346          * Loop through all the program headers.
 347          */
 348         for ( ; num; num--) {
 349                 if (pread(fd, xph_addr, xph_sizeof, off) < (ssize_t)xph_sizeof) {
 350                         file_badread(ms);
 351                         return -1;
 352                 }
 353                 off += size;
 354
 355                 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) {
 356                         /* Perhaps warn here */
 357                         continue;
 358                 }
 359
 360                 if (xph_type != PT_NOTE)
 361                         continue;
 362
 363                 /*
 364                  * This is a PT_NOTE section; loop through all the notes
 365                  * in the section.
 366                  */
 367                 len = xph_filesz < sizeof(nbuf) ? xph_filesz : sizeof(nbuf);
 368                 if ((bufsize = pread(fd, nbuf, len, xph_offset)) == -1) {
 369                         file_badread(ms);
 370                         return -1;
 371                 }
 372                 offset = 0;
 373                 for (;;) {
 374                         if (offset >= (size_t)bufsize)
 375                                 break;
 376                         offset = donote(ms, nbuf, offset, (size_t)bufsize,
 377                             clazz, swap, 4, flags, notecount, fd, ph_off,
 378                             ph_num, fsize);
 379                         if (offset == 0)
 380                                 break;
 381
 382                 }
 383         }
 384         return 0;
 385 }
 386 #endif
 387
 388 static void
 389 do_note_netbsd_version(struct magic_set *ms, int swap, void *v)
 390 {
 391         uint32_t desc;
 392         (void)memcpy(&desc, v, sizeof(desc));
 393         desc = elf_getu32(swap, desc);
 394
 395         if (file_printf(ms, ", for NetBSD") == -1)
 396                 return;
 397         /*
 398          * The version number used to be stuck as 199905, and was thus
 399          * basically content-free.  Newer versions of NetBSD have fixed
 400          * this and now use the encoding of __NetBSD_Version__:
 401          *
 402          *      MMmmrrpp00
 403          *
 404          * M = major version
 405          * m = minor version
 406          * r = release ["",A-Z,Z[A-Z] but numeric]
 407          * p = patchlevel
 408          */
 409         if (desc > 100000000U) {
 410                 uint32_t ver_patch = (desc / 100) % 100;
 411                 uint32_t ver_rel = (desc / 10000) % 100;
 412                 uint32_t ver_min = (desc / 1000000) % 100;
 413                 uint32_t ver_maj = desc / 100000000;
 414
 415                 if (file_printf(ms, " %u.%u", ver_maj, ver_min) == -1)
 416                         return;
 417                 if (ver_rel == 0 && ver_patch != 0) {
 418                         if (file_printf(ms, ".%u", ver_patch) == -1)
 419                                 return;
 420                 } else if (ver_rel != 0) {
 421                         while (ver_rel > 26) {
 422                                 if (file_printf(ms, "Z") == -1)
 423                                         return;
 424                                 ver_rel -= 26;
 425                         }
 426                         if (file_printf(ms, "%c", 'A' + ver_rel - 1)
 427                             == -1)
 428                                 return;
 429                 }
 430         }
 431 }
 432
 433 static void
 434 do_note_freebsd_version(struct magic_set *ms, int swap, void *v)
 435 {
 436         uint32_t desc;
 437
 438         (void)memcpy(&desc, v, sizeof(desc));
 439         desc = elf_getu32(swap, desc);
 440         if (file_printf(ms, ", for FreeBSD") == -1)
 441                 return;
 442
 443         /*
 444          * Contents is __FreeBSD_version, whose relation to OS
 445          * versions is defined by a huge table in the Porter's
 446          * Handbook.  This is the general scheme:
 447          *
 448          * Releases:
 449          *      Mmp000 (before 4.10)
 450          *      Mmi0p0 (before 5.0)
 451          *      Mmm0p0
 452          *
 453          * Development branches:
 454          *      Mmpxxx (before 4.6)
 455          *      Mmp1xx (before 4.10)
 456          *      Mmi1xx (before 5.0)
 457          *      M000xx (pre-M.0)
 458          *      Mmm1xx
 459          *
 460          * M = major version
 461          * m = minor version
 462          * i = minor version increment (491000 -> 4.10)
 463          * p = patchlevel
 464          * x = revision
 465          *
 466          * The first release of FreeBSD to use ELF by default
 467          * was version 3.0.
 468          */
 469         if (desc == 460002) {
 470                 if (file_printf(ms, " 4.6.2") == -1)
 471                         return;
 472         } else if (desc < 460100) {
 473                 if (file_printf(ms, " %d.%d", desc / 100000,
 474                     desc / 10000 % 10) == -1)
 475                         return;
 476                 if (desc / 1000 % 10 > 0)
 477                         if (file_printf(ms, ".%d", desc / 1000 % 10) == -1)
 478                                 return;
 479                 if ((desc % 1000 > 0) || (desc % 100000 == 0))
 480                         if (file_printf(ms, " (%d)", desc) == -1)
 481                                 return;
 482         } else if (desc < 500000) {
 483                 if (file_printf(ms, " %d.%d", desc / 100000,
 484                     desc / 10000 % 10 + desc / 1000 % 10) == -1)
 485                         return;
 486                 if (desc / 100 % 10 > 0) {
 487                         if (file_printf(ms, " (%d)", desc) == -1)
 488                                 return;
 489                 } else if (desc / 10 % 10 > 0) {
 490                         if (file_printf(ms, ".%d", desc / 10 % 10) == -1)
 491                                 return;
 492                 }
 493         } else {
 494                 if (file_printf(ms, " %d.%d", desc / 100000,
 495                     desc / 1000 % 100) == -1)
 496                         return;
 497                 if ((desc / 100 % 10 > 0) ||
 498                     (desc % 100000 / 100 == 0)) {
 499                         if (file_printf(ms, " (%d)", desc) == -1)
 500                                 return;
 501                 } else if (desc / 10 % 10 > 0) {
 502                         if (file_printf(ms, ".%d", desc / 10 % 10) == -1)
 503                                 return;
 504                 }
 505         }
 506 }
 507
 508 private int
 509 /*ARGSUSED*/
 510 do_bid_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type,
 511     int swap __attribute__((__unused__)), uint32_t namesz, uint32_t descsz,
 512     size_t noff, size_t doff, int *flags)
 513 {
 514         if (namesz == 4 && strcmp((char *)&nbuf[noff], "GNU") == 0 &&
 515             type == NT_GNU_BUILD_ID && (descsz >= 4 && descsz <= 20)) {
 516                 uint8_t desc[20];
 517                 const char *btype;
 518                 uint32_t i;
 519                 *flags |= FLAGS_DID_BUILD_ID;
 520                 switch (descsz) {
 521                 case 8:
 522                     btype = "xxHash";
 523                     break;
 524                 case 16:
 525                     btype = "md5/uuid";
 526                     break;
 527                 case 20:
 528                     btype = "sha1";
 529                     break;
 530                 default:
 531                     btype = "unknown";
 532                     break;
 533                 }
 534                 if (file_printf(ms, ", BuildID[%s]=", btype) == -1)
 535                         return 1;
 536                 (void)memcpy(desc, &nbuf[doff], descsz);
 537                 for (i = 0; i < descsz; i++)
 538                     if (file_printf(ms, "%02x", desc[i]) == -1)
 539                         return 1;
 540                 return 1;
 541         }
 542         return 0;
 543 }
 544
 545 private int
 546 do_os_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type,
 547     int swap, uint32_t namesz, uint32_t descsz,
 548     size_t noff, size_t doff, int *flags)
 549 {
 550         if (namesz == 5 && strcmp((char *)&nbuf[noff], "SuSE") == 0 &&
 551             type == NT_GNU_VERSION && descsz == 2) {
 552             *flags |= FLAGS_DID_OS_NOTE;
 553             file_printf(ms, ", for SuSE %d.%d", nbuf[doff], nbuf[doff + 1]);
 554             return 1;
 555         }
 556
 557         if (namesz == 4 && strcmp((char *)&nbuf[noff], "GNU") == 0 &&
 558             type == NT_GNU_VERSION && descsz == 16) {
 559                 uint32_t desc[4];
 560                 (void)memcpy(desc, &nbuf[doff], sizeof(desc));
 561
 562                 *flags |= FLAGS_DID_OS_NOTE;
 563                 if (file_printf(ms, ", for GNU/") == -1)
 564                         return 1;
 565                 switch (elf_getu32(swap, desc[0])) {
 566                 case GNU_OS_LINUX:
 567                         if (file_printf(ms, "Linux") == -1)
 568                                 return 1;
 569                         break;
 570                 case GNU_OS_HURD:
 571                         if (file_printf(ms, "Hurd") == -1)
 572                                 return 1;
 573                         break;
 574                 case GNU_OS_SOLARIS:
 575                         if (file_printf(ms, "Solaris") == -1)
 576                                 return 1;
 577                         break;
 578                 case GNU_OS_KFREEBSD:
 579                         if (file_printf(ms, "kFreeBSD") == -1)
 580                                 return 1;
 581                         break;
 582                 case GNU_OS_KNETBSD:
 583                         if (file_printf(ms, "kNetBSD") == -1)
 584                                 return 1;
 585                         break;
 586                 default:
 587                         if (file_printf(ms, "<unknown>") == -1)
 588                                 return 1;
 589                 }
 590                 if (file_printf(ms, " %d.%d.%d", elf_getu32(swap, desc[1]),
 591                     elf_getu32(swap, desc[2]), elf_getu32(swap, desc[3])) == -1)
 592                         return 1;
 593                 return 1;
 594         }
 595
 596         if (namesz == 7 && strcmp((char *)&nbuf[noff], "NetBSD") == 0) {
 597                 if (type == NT_NETBSD_VERSION && descsz == 4) {
 598                         *flags |= FLAGS_DID_OS_NOTE;
 599                         do_note_netbsd_version(ms, swap, &nbuf[doff]);
 600                         return 1;
 601                 }
 602         }
 603
 604         if (namesz == 8 && strcmp((char *)&nbuf[noff], "FreeBSD") == 0) {
 605                 if (type == NT_FREEBSD_VERSION && descsz == 4) {
 606                         *flags |= FLAGS_DID_OS_NOTE;
 607                         do_note_freebsd_version(ms, swap, &nbuf[doff]);
 608                         return 1;
 609                 }
 610         }
 611
 612         if (namesz == 8 && strcmp((char *)&nbuf[noff], "OpenBSD") == 0 &&
 613             type == NT_OPENBSD_VERSION && descsz == 4) {
 614                 *flags |= FLAGS_DID_OS_NOTE;
 615                 if (file_printf(ms, ", for OpenBSD") == -1)
 616                         return 1;
 617                 /* Content of note is always 0 */
 618                 return 1;
 619         }
 620
 621         if (namesz == 10 && strcmp((char *)&nbuf[noff], "DragonFly") == 0 &&
 622             type == NT_DRAGONFLY_VERSION && descsz == 4) {
 623                 uint32_t desc;
 624                 *flags |= FLAGS_DID_OS_NOTE;
 625                 if (file_printf(ms, ", for DragonFly") == -1)
 626                         return 1;
 627                 (void)memcpy(&desc, &nbuf[doff], sizeof(desc));
 628                 desc = elf_getu32(swap, desc);
 629                 if (file_printf(ms, " %d.%d.%d", desc / 100000,
 630                     desc / 10000 % 10, desc % 10000) == -1)
 631                         return 1;
 632                 return 1;
 633         }
 634         return 0;
 635 }
 636
 637 private int
 638 do_pax_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type,
 639     int swap, uint32_t namesz, uint32_t descsz,
 640     size_t noff, size_t doff, int *flags)
 641 {
 642         if (namesz == 4 && strcmp((char *)&nbuf[noff], "PaX") == 0 &&
 643             type == NT_NETBSD_PAX && descsz == 4) {
 644                 static const char *pax[] = {
 645                     "+mprotect",
 646                     "-mprotect",
 647                     "+segvguard",
 648                     "-segvguard",
 649                     "+ASLR",
 650                     "-ASLR",
 651                 };
 652                 uint32_t desc;
 653                 size_t i;
 654                 int did = 0;
 655
 656                 *flags |= FLAGS_DID_NETBSD_PAX;
 657                 (void)memcpy(&desc, &nbuf[doff], sizeof(desc));
 658                 desc = elf_getu32(swap, desc);
 659
 660                 if (desc && file_printf(ms, ", PaX: ") == -1)
 661                         return 1;
 662
 663                 for (i = 0; i < __arraycount(pax); i++) {
 664                         if (((1 << (int)i) & desc) == 0)
 665                                 continue;
 666                         if (file_printf(ms, "%s%s", did++ ? "," : "",
 667                             pax[i]) == -1)
 668                                 return 1;
 669                 }
 670                 return 1;
 671         }
 672         return 0;
 673 }
 674
 675 private int
 676 do_core_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type,
 677     int swap, uint32_t namesz, uint32_t descsz,
 678     size_t noff, size_t doff, int *flags, size_t size, int clazz)
 679 {
 680 #ifdef ELFCORE
 681         int os_style = -1;
 682         /*
 683          * Sigh.  The 2.0.36 kernel in Debian 2.1, at
 684          * least, doesn't correctly implement name
 685          * sections, in core dumps, as specified by
 686          * the "Program Linking" section of "UNIX(R) System
 687          * V Release 4 Programmer's Guide: ANSI C and
 688          * Programming Support Tools", because my copy
 689          * clearly says "The first 'namesz' bytes in 'name'
 690          * contain a *null-terminated* [emphasis mine]
 691          * character representation of the entry's owner
 692          * or originator", but the 2.0.36 kernel code
 693          * doesn't include the terminating null in the
 694          * name....
 695          */
 696         if ((namesz == 4 && strncmp((char *)&nbuf[noff], "CORE", 4) == 0) ||
 697             (namesz == 5 && strcmp((char *)&nbuf[noff], "CORE") == 0)) {
 698                 os_style = OS_STYLE_SVR4;
 699         }
 700
 701         if ((namesz == 8 && strcmp((char *)&nbuf[noff], "FreeBSD") == 0)) {
 702                 os_style = OS_STYLE_FREEBSD;
 703         }
 704
 705         if ((namesz >= 11 && strncmp((char *)&nbuf[noff], "NetBSD-CORE", 11)
 706             == 0)) {
 707                 os_style = OS_STYLE_NETBSD;
 708         }
 709
 710         if (os_style != -1 && (*flags & FLAGS_DID_CORE_STYLE) == 0) {
 711                 if (file_printf(ms, ", %s-style", os_style_names[os_style])
 712                     == -1)
 713                         return 1;
 714                 *flags |= FLAGS_DID_CORE_STYLE;
 715                 *flags |= os_style;
 716         }
 717
 718         switch (os_style) {
 719         case OS_STYLE_NETBSD:
 720                 if (type == NT_NETBSD_CORE_PROCINFO) {
 721                         char sbuf[512];
 722                         struct NetBSD_elfcore_procinfo pi;
 723                         memset(&pi, 0, sizeof(pi));
 724                         memcpy(&pi, nbuf + doff, descsz);
 725
 726                         if (file_printf(ms, ", from '%.31s', pid=%u, uid=%u, "
 727                             "gid=%u, nlwps=%u, lwp=%u (signal %u/code %u)",
 728                             file_printable(sbuf, sizeof(sbuf),
 729                             CAST(char *, pi.cpi_name)),
 730                             elf_getu32(swap, (uint32_t)pi.cpi_pid),
 731                             elf_getu32(swap, pi.cpi_euid),
 732                             elf_getu32(swap, pi.cpi_egid),
 733                             elf_getu32(swap, pi.cpi_nlwps),
 734                             elf_getu32(swap, (uint32_t)pi.cpi_siglwp),
 735                             elf_getu32(swap, pi.cpi_signo),
 736                             elf_getu32(swap, pi.cpi_sigcode)) == -1)
 737                                 return 1;
 738
 739                         *flags |= FLAGS_DID_CORE;
 740                         return 1;
 741                 }
 742                 break;
 743
 744         default:
 745                 if (type == NT_PRPSINFO && *flags & FLAGS_IS_CORE) {
 746                         size_t i, j;
 747                         unsigned char c;
 748                         /*
 749                          * Extract the program name.  We assume
 750                          * it to be 16 characters (that's what it
 751                          * is in SunOS 5.x and Linux).
 752                          *
 753                          * Unfortunately, it's at a different offset
 754                          * in various OSes, so try multiple offsets.
 755                          * If the characters aren't all printable,
 756                          * reject it.
 757                          */
 758                         for (i = 0; i < NOFFSETS; i++) {
 759                                 unsigned char *cname, *cp;
 760                                 size_t reloffset = prpsoffsets(i);
 761                                 size_t noffset = doff + reloffset;
 762                                 size_t k;
 763                                 for (j = 0; j < 16; j++, noffset++,
 764                                     reloffset++) {
 765                                         /*
 766                                          * Make sure we're not past
 767                                          * the end of the buffer; if
 768                                          * we are, just give up.
 769                                          */
 770                                         if (noffset >= size)
 771                                                 goto tryanother;
 772
 773                                         /*
 774                                          * Make sure we're not past
 775                                          * the end of the contents;
 776                                          * if we are, this obviously
 777                                          * isn't the right offset.
 778                                          */
 779                                         if (reloffset >= descsz)
 780                                                 goto tryanother;
 781
 782                                         c = nbuf[noffset];
 783                                         if (c == '\0') {
 784                                                 /*
 785                                                  * A '\0' at the
 786                                                  * beginning is
 787                                                  * obviously wrong.
 788                                                  * Any other '\0'
 789                                                  * means we're done.
 790                                                  */
 791                                                 if (j == 0)
 792                                                         goto tryanother;
 793                                                 else
 794                                                         break;
 795                                         } else {
 796                                                 /*
 797                                                  * A nonprintable
 798                                                  * character is also
 799                                                  * wrong.
 800                                                  */
 801                                                 if (!isprint(c) || isquote(c))
 802                                                         goto tryanother;
 803                                         }
 804                                 }
 805                                 /*
 806                                  * Well, that worked.
 807                                  */
 808
 809                                 /*
 810                                  * Try next offsets, in case this match is
 811                                  * in the middle of a string.
 812                                  */
 813                                 for (k = i + 1 ; k < NOFFSETS; k++) {
 814                                         size_t no;
 815                                         int adjust = 1;
 816                                         if (prpsoffsets(k) >= prpsoffsets(i))
 817                                                 continue;
 818                                         for (no = doff + prpsoffsets(k);
 819                                              no < doff + prpsoffsets(i); no++)
 820                                                 adjust = adjust
 821                                                          && isprint(nbuf[no]);
 822                                         if (adjust)
 823                                                 i = k;
 824                                 }
 825
 826                                 cname = (unsigned char *)
 827                                     &nbuf[doff + prpsoffsets(i)];
 828                                 for (cp = cname; *cp && isprint(*cp); cp++)
 829                                         continue;
 830                                 /*
 831                                  * Linux apparently appends a space at the end
 832                                  * of the command line: remove it.
 833                                  */
 834                                 while (cp > cname && isspace(cp[-1]))
 835                                         cp--;
 836                                 if (file_printf(ms, ", from '%.*s'",
 837                                     (int)(cp - cname), cname) == -1)
 838                                         return 1;
 839                                 *flags |= FLAGS_DID_CORE;
 840                                 return 1;
 841
 842                         tryanother:
 843                                 ;
 844                         }
 845                 }
 846                 break;
 847         }
 848 #endif
 849         return 0;
 850 }
 851
 852 private off_t
 853 get_offset_from_virtaddr(struct magic_set *ms, int swap, int clazz, int fd,
 854     off_t off, int num, off_t fsize, uint64_t virtaddr)
 855 {
 856         Elf32_Phdr ph32;
 857         Elf64_Phdr ph64;
 858
 859         /*
 860          * Loop through all the program headers and find the header with
 861          * virtual address in which the "virtaddr" belongs to.
 862          */
 863         for ( ; num; num--) {
 864                 if (pread(fd, xph_addr, xph_sizeof, off) < (ssize_t)xph_sizeof) {
 865                         file_badread(ms);
 866                         return -1;
 867                 }
 868                 off += xph_sizeof;
 869
 870                 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) {
 871                         /* Perhaps warn here */
 872                         continue;
 873                 }
 874
 875                 if (virtaddr >= xph_vaddr && virtaddr < xph_vaddr + xph_filesz)
 876                         return xph_offset + (virtaddr - xph_vaddr);
 877         }
 878         return 0;
 879 }
 880
 881 private size_t
 882 get_string_on_virtaddr(struct magic_set *ms,
 883     int swap, int clazz, int fd, off_t ph_off, int ph_num,
 884     off_t fsize, uint64_t virtaddr, char *buf, ssize_t buflen)
 885 {
 886         char *bptr;
 887         off_t offset;
 888
 889         if (buflen == 0)
 890                 return 0;
 891
 892         offset = get_offset_from_virtaddr(ms, swap, clazz, fd, ph_off, ph_num,
 893             fsize, virtaddr);
 894         if ((buflen = pread(fd, buf, CAST(size_t, buflen), offset)) <= 0) {
 895                 file_badread(ms);
 896                 return 0;
 897         }
 898
 899         buf[buflen - 1] = '\0';
 900
 901         /* We expect only printable characters, so return if buffer contains
 902          * non-printable character before the '\0' or just '\0'. */
 903         for (bptr = buf; *bptr && isprint((unsigned char)*bptr); bptr++)
 904                 continue;
 905         if (*bptr != '\0')
 906                 return 0;
 907
 908         return bptr - buf;
 909 }
 910
 911
 912 /*ARGSUSED*/
 913 private int
 914 do_auxv_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type,
 915     int swap, uint32_t namesz __attribute__((__unused__)),
 916     uint32_t descsz __attribute__((__unused__)),
 917     size_t noff __attribute__((__unused__)), size_t doff,
 918     int *flags, size_t size __attribute__((__unused__)), int clazz,
 919     int fd, off_t ph_off, int ph_num, off_t fsize)
 920 {
 921 #ifdef ELFCORE
 922         Aux32Info auxv32;
 923         Aux64Info auxv64;
 924         size_t elsize = xauxv_sizeof;
 925         const char *tag;
 926         int is_string;
 927         size_t nval;
 928
 929         if ((*flags & (FLAGS_IS_CORE|FLAGS_DID_CORE_STYLE)) !=
 930             (FLAGS_IS_CORE|FLAGS_DID_CORE_STYLE))
 931                 return 0;
 932
 933         switch (*flags & FLAGS_CORE_STYLE) {
 934         case OS_STYLE_SVR4:
 935                 if (type != NT_AUXV)
 936                         return 0;
 937                 break;
 938 #ifdef notyet
 939         case OS_STYLE_NETBSD:
 940                 if (type != NT_NETBSD_CORE_AUXV)
 941                         return 0;
 942                 break;
 943         case OS_STYLE_FREEBSD:
 944                 if (type != NT_FREEBSD_PROCSTAT_AUXV)
 945                         return 0;
 946                 break;
 947 #endif
 948         default:
 949                 return 0;
 950         }
 951
 952         *flags |= FLAGS_DID_AUXV;
 953
 954         nval = 0;
 955         for (size_t off = 0; off + elsize <= descsz; off += elsize) {
 956                 (void)memcpy(xauxv_addr, &nbuf[doff + off], xauxv_sizeof);
 957                 /* Limit processing to 50 vector entries to prevent DoS */
 958                 if (nval++ >= 50) {
 959                         file_error(ms, 0, "Too many ELF Auxv elements");
 960                         return 1;
 961                 }
 962
 963                 switch(xauxv_type) {
 964                 case AT_LINUX_EXECFN:
 965                         is_string = 1;
 966                         tag = "execfn";
 967                         break;
 968                 case AT_LINUX_PLATFORM:
 969                         is_string = 1;
 970                         tag = "platform";
 971                         break;
 972                 case AT_LINUX_UID:
 973                         is_string = 0;
 974                         tag = "real uid";
 975                         break;
 976                 case AT_LINUX_GID:
 977                         is_string = 0;
 978                         tag = "real gid";
 979                         break;
 980                 case AT_LINUX_EUID:
 981                         is_string = 0;
 982                         tag = "effective uid";
 983                         break;
 984                 case AT_LINUX_EGID:
 985                         is_string = 0;
 986                         tag = "effective gid";
 987                         break;
 988                 default:
 989                         is_string = 0;
 990                         tag = NULL;
 991                         break;
 992                 }
 993
 994                 if (tag == NULL)
 995                         continue;
 996
 997                 if (is_string) {
 998                         char buf[256];
 999                         ssize_t buflen;
1000                         buflen = get_string_on_virtaddr(ms, swap, clazz, fd,
1001                             ph_off, ph_num, fsize, xauxv_val, buf, sizeof(buf));
1002
1003                         if (buflen == 0)
1004                                 continue;
1005
1006                         if (file_printf(ms, ", %s: '%s'", tag, buf) == -1)
1007                                 return 0;
1008                 } else {
1009                         if (file_printf(ms, ", %s: %d", tag, (int) xauxv_val)
1010                             == -1)
1011                                 return 0;
1012                 }
1013         }
1014         return 1;
1015 #else
1016         return 0;
1017 #endif
1018 }
1019
1020 private size_t
1021 donote(struct magic_set *ms, void *vbuf, size_t offset, size_t size,
1022     int clazz, int swap, size_t align, int *flags, uint16_t *notecount,
1023     int fd, off_t ph_off, int ph_num, off_t fsize)
1024 {
1025         Elf32_Nhdr nh32;
1026         Elf64_Nhdr nh64;
1027         size_t noff, doff;
1028         uint32_t namesz, descsz;
1029         unsigned char *nbuf = CAST(unsigned char *, vbuf);
1030
1031         if (*notecount == 0)
1032                 return 0;
1033         --*notecount;
1034
1035         if (xnh_sizeof + offset > size) {
1036                 /*
1037                  * We're out of note headers.
1038                  */
1039                 return xnh_sizeof + offset;
1040         }
1041
1042         (void)memcpy(xnh_addr, &nbuf[offset], xnh_sizeof);
1043         offset += xnh_sizeof;
1044
1045         namesz = xnh_namesz;
1046         descsz = xnh_descsz;
1047
1048         if ((namesz == 0) && (descsz == 0)) {
1049                 /*
1050                  * We're out of note headers.
1051                  */
1052                 return (offset >= size) ? offset : size;
1053         }
1054
1055         if (namesz & 0x80000000) {
1056             (void)file_printf(ms, ", bad note name size %#lx",
1057                 (unsigned long)namesz);
1058             return 0;
1059         }
1060
1061         if (descsz & 0x80000000) {
1062             (void)file_printf(ms, ", bad note description size %#lx",
1063                 (unsigned long)descsz);
1064             return 0;
1065         }
1066
1067         noff = offset;
1068         doff = ELF_ALIGN(offset + namesz);
1069
1070         if (offset + namesz > size) {
1071                 /*
1072                  * We're past the end of the buffer.
1073                  */
1074                 return doff;
1075         }
1076
1077         offset = ELF_ALIGN(doff + descsz);
1078         if (doff + descsz > size) {
1079                 /*
1080                  * We're past the end of the buffer.
1081                  */
1082                 return (offset >= size) ? offset : size;
1083         }
1084
1085
1086         if ((*flags & FLAGS_DID_OS_NOTE) == 0) {
1087                 if (do_os_note(ms, nbuf, xnh_type, swap,
1088                     namesz, descsz, noff, doff, flags))
1089                         return offset;
1090         }
1091
1092         if ((*flags & FLAGS_DID_BUILD_ID) == 0) {
1093                 if (do_bid_note(ms, nbuf, xnh_type, swap,
1094                     namesz, descsz, noff, doff, flags))
1095                         return offset;
1096         }
1097
1098         if ((*flags & FLAGS_DID_NETBSD_PAX) == 0) {
1099                 if (do_pax_note(ms, nbuf, xnh_type, swap,
1100                     namesz, descsz, noff, doff, flags))
1101                         return offset;
1102         }
1103
1104         if ((*flags & FLAGS_DID_CORE) == 0) {
1105                 if (do_core_note(ms, nbuf, xnh_type, swap,
1106                     namesz, descsz, noff, doff, flags, size, clazz))
1107                         return offset;
1108         }
1109
1110         if ((*flags & FLAGS_DID_AUXV) == 0) {
1111                 if (do_auxv_note(ms, nbuf, xnh_type, swap,
1112                         namesz, descsz, noff, doff, flags, size, clazz,
1113                         fd, ph_off, ph_num, fsize))
1114                         return offset;
1115         }
1116
1117         if (namesz == 7 && strcmp((char *)&nbuf[noff], "NetBSD") == 0) {
1118                 if (descsz > 100)
1119                         descsz = 100;
1120                 switch (xnh_type) {
1121                 case NT_NETBSD_VERSION:
1122                         return offset;
1123                 case NT_NETBSD_MARCH:
1124                         if (*flags & FLAGS_DID_NETBSD_MARCH)
1125                                 return offset;
1126                         *flags |= FLAGS_DID_NETBSD_MARCH;
1127                         if (file_printf(ms, ", compiled for: %.*s",
1128                             (int)descsz, (const char *)&nbuf[doff]) == -1)
1129                                 return offset;
1130                         break;
1131                 case NT_NETBSD_CMODEL:
1132                         if (*flags & FLAGS_DID_NETBSD_CMODEL)
1133                                 return offset;
1134                         *flags |= FLAGS_DID_NETBSD_CMODEL;
1135                         if (file_printf(ms, ", compiler model: %.*s",
1136                             (int)descsz, (const char *)&nbuf[doff]) == -1)
1137                                 return offset;
1138                         break;
1139                 case NT_NETBSD_EMULATION:
1140                         if (*flags & FLAGS_DID_NETBSD_EMULATION)
1141                                 return offset;
1142                         *flags |= FLAGS_DID_NETBSD_EMULATION;
1143                         if (file_printf(ms, ", emulation: %.*s",
1144                             (int)descsz, (const char *)&nbuf[doff]) == -1)
1145                                 return offset;
1146                         break;
1147                 default:
1148                         if (*flags & FLAGS_DID_NETBSD_UNKNOWN)
1149                                 return offset;
1150                         *flags |= FLAGS_DID_NETBSD_UNKNOWN;
1151                         if (file_printf(ms, ", note=%u", xnh_type) == -1)
1152                                 return offset;
1153                         break;
1154                 }
1155                 return offset;
1156         }
1157
1158         return offset;
1159 }
1160
1161 /* SunOS 5.x hardware capability descriptions */
1162 typedef struct cap_desc {
1163         uint64_t cd_mask;
1164         const char *cd_name;
1165 } cap_desc_t;
1166
1167 static const cap_desc_t cap_desc_sparc[] = {
1168         { AV_SPARC_MUL32,               "MUL32" },
1169         { AV_SPARC_DIV32,               "DIV32" },
1170         { AV_SPARC_FSMULD,              "FSMULD" },
1171         { AV_SPARC_V8PLUS,              "V8PLUS" },
1172         { AV_SPARC_POPC,                "POPC" },
1173         { AV_SPARC_VIS,                 "VIS" },
1174         { AV_SPARC_VIS2,                "VIS2" },
1175         { AV_SPARC_ASI_BLK_INIT,        "ASI_BLK_INIT" },
1176         { AV_SPARC_FMAF,                "FMAF" },
1177         { AV_SPARC_FJFMAU,              "FJFMAU" },
1178         { AV_SPARC_IMA,                 "IMA" },
1179         { 0, NULL }
1180 };
1181
1182 static const cap_desc_t cap_desc_386[] = {
1183         { AV_386_FPU,                   "FPU" },
1184         { AV_386_TSC,                   "TSC" },
1185         { AV_386_CX8,                   "CX8" },
1186         { AV_386_SEP,                   "SEP" },
1187         { AV_386_AMD_SYSC,              "AMD_SYSC" },
1188         { AV_386_CMOV,                  "CMOV" },
1189         { AV_386_MMX,                   "MMX" },
1190         { AV_386_AMD_MMX,               "AMD_MMX" },
1191         { AV_386_AMD_3DNow,             "AMD_3DNow" },
1192         { AV_386_AMD_3DNowx,            "AMD_3DNowx" },
1193         { AV_386_FXSR,                  "FXSR" },
1194         { AV_386_SSE,                   "SSE" },
1195         { AV_386_SSE2,                  "SSE2" },
1196         { AV_386_PAUSE,                 "PAUSE" },
1197         { AV_386_SSE3,                  "SSE3" },
1198         { AV_386_MON,                   "MON" },
1199         { AV_386_CX16,                  "CX16" },
1200         { AV_386_AHF,                   "AHF" },
1201         { AV_386_TSCP,                  "TSCP" },
1202         { AV_386_AMD_SSE4A,             "AMD_SSE4A" },
1203         { AV_386_POPCNT,                "POPCNT" },
1204         { AV_386_AMD_LZCNT,             "AMD_LZCNT" },
1205         { AV_386_SSSE3,                 "SSSE3" },
1206         { AV_386_SSE4_1,                "SSE4.1" },
1207         { AV_386_SSE4_2,                "SSE4.2" },
1208         { 0, NULL }
1209 };
1210
1211 private int
1212 doshn(struct magic_set *ms, int clazz, int swap, int fd, off_t off, int num,
1213     size_t size, off_t fsize, int mach, int strtab, int *flags,
1214     uint16_t *notecount)
1215 {
1216         Elf32_Shdr sh32;
1217         Elf64_Shdr sh64;
1218         int stripped = 1, has_debug_info = 0;
1219         size_t nbadcap = 0;
1220         void *nbuf;
1221         off_t noff, coff, name_off;
1222         uint64_t cap_hw1 = 0;   /* SunOS 5.x hardware capabilities */
1223         uint64_t cap_sf1 = 0;   /* SunOS 5.x software capabilities */
1224         char name[50];
1225         ssize_t namesize;
1226
1227         if (size != xsh_sizeof) {
1228                 if (file_printf(ms, ", corrupted section header size") == -1)
1229                         return -1;
1230                 return 0;
1231         }
1232
1233         /* Read offset of name section to be able to read section names later */
1234         if (pread(fd, xsh_addr, xsh_sizeof, CAST(off_t, (off + size * strtab)))
1235             < (ssize_t)xsh_sizeof) {
1236                 if (file_printf(ms, ", missing section headers") == -1)
1237                         return -1;
1238                 return 0;
1239         }
1240         name_off = xsh_offset;
1241
1242         for ( ; num; num--) {
1243                 /* Read the name of this section. */
1244                 if ((namesize = pread(fd, name, sizeof(name) - 1, name_off + xsh_name)) == -1) {
1245                         file_badread(ms);
1246                         return -1;
1247                 }
1248                 name[namesize] = '\0';
1249                 if (strcmp(name, ".debug_info") == 0) {
1250                         has_debug_info = 1;
1251                         stripped = 0;
1252                 }
1253
1254                 if (pread(fd, xsh_addr, xsh_sizeof, off) < (ssize_t)xsh_sizeof) {
1255                         file_badread(ms);
1256                         return -1;
1257                 }
1258                 off += size;
1259
1260                 /* Things we can determine before we seek */
1261                 switch (xsh_type) {
1262                 case SHT_SYMTAB:
1263 #if 0
1264                 case SHT_DYNSYM:
1265 #endif
1266                         stripped = 0;
1267                         break;
1268                 default:
1269                         if (fsize != SIZE_UNKNOWN && xsh_offset > fsize) {
1270                                 /* Perhaps warn here */
1271                                 continue;
1272                         }
1273                         break;
1274                 }
1275
1276
1277                 /* Things we can determine when we seek */
1278                 switch (xsh_type) {
1279                 case SHT_NOTE:
1280                         if ((uintmax_t)(xsh_size + xsh_offset) >
1281                             (uintmax_t)fsize) {
1282                                 if (file_printf(ms,
1283                                     ", note offset/size %#" INTMAX_T_FORMAT
1284                                     "x+%#" INTMAX_T_FORMAT "x exceeds"
1285                                     " file size %#" INTMAX_T_FORMAT "x",
1286                                     (uintmax_t)xsh_offset, (uintmax_t)xsh_size,
1287                                     (uintmax_t)fsize) == -1)
1288                                         return -1;
1289                                 return 0;
1290                         }
1291                         if ((nbuf = malloc(xsh_size)) == NULL) {
1292                                 file_error(ms, errno, "Cannot allocate memory"
1293                                     " for note");
1294                                 return -1;
1295                         }
1296                         if (pread(fd, nbuf, xsh_size, xsh_offset) <
1297                             (ssize_t)xsh_size) {
1298                                 file_badread(ms);
1299                                 free(nbuf);
1300                                 return -1;
1301                         }
1302
1303                         noff = 0;
1304                         for (;;) {
1305                                 if (noff >= (off_t)xsh_size)
1306                                         break;
1307                                 noff = donote(ms, nbuf, (size_t)noff,
1308                                     xsh_size, clazz, swap, 4, flags, notecount,
1309                                     fd, 0, 0, 0);
1310                                 if (noff == 0)
1311                                         break;
1312                         }
1313                         free(nbuf);
1314                         break;
1315                 case SHT_SUNW_cap:
1316                         switch (mach) {
1317                         case EM_SPARC:
1318                         case EM_SPARCV9:
1319                         case EM_IA_64:
1320                         case EM_386:
1321                         case EM_AMD64:
1322                                 break;
1323                         default:
1324                                 goto skip;
1325                         }
1326
1327                         if (nbadcap > 5)
1328                                 break;
1329                         if (lseek(fd, xsh_offset, SEEK_SET) == (off_t)-1) {
1330                                 file_badseek(ms);
1331                                 return -1;
1332                         }
1333                         coff = 0;
1334                         for (;;) {
1335                                 Elf32_Cap cap32;
1336                                 Elf64_Cap cap64;
1337                                 char cbuf[/*CONSTCOND*/
1338                                     MAX(sizeof cap32, sizeof cap64)];
1339                                 if ((coff += xcap_sizeof) > (off_t)xsh_size)
1340                                         break;
1341                                 if (read(fd, cbuf, (size_t)xcap_sizeof) !=
1342                                     (ssize_t)xcap_sizeof) {
1343                                         file_badread(ms);
1344                                         return -1;
1345                                 }
1346                                 if (cbuf[0] == 'A') {
1347 #ifdef notyet
1348                                         char *p = cbuf + 1;
1349                                         uint32_t len, tag;
1350                                         memcpy(&len, p, sizeof(len));
1351                                         p += 4;
1352                                         len = getu32(swap, len);
1353                                         if (memcmp("gnu", p, 3) != 0) {
1354                                             if (file_printf(ms,
1355                                                 ", unknown capability %.3s", p)
1356                                                 == -1)
1357                                                 return -1;
1358                                             break;
1359                                         }
1360                                         p += strlen(p) + 1;
1361                                         tag = *p++;
1362                                         memcpy(&len, p, sizeof(len));
1363                                         p += 4;
1364                                         len = getu32(swap, len);
1365                                         if (tag != 1) {
1366                                             if (file_printf(ms, ", unknown gnu"
1367                                                 " capability tag %d", tag)
1368                                                 == -1)
1369                                                 return -1;
1370                                             break;
1371                                         }
1372                                         // gnu attributes
1373 #endif
1374                                         break;
1375                                 }
1376                                 (void)memcpy(xcap_addr, cbuf, xcap_sizeof);
1377                                 switch (xcap_tag) {
1378                                 case CA_SUNW_NULL:
1379                                         break;
1380                                 case CA_SUNW_HW_1:
1381                                         cap_hw1 |= xcap_val;
1382                                         break;
1383                                 case CA_SUNW_SF_1:
1384                                         cap_sf1 |= xcap_val;
1385                                         break;
1386                                 default:
1387                                         if (file_printf(ms,
1388                                             ", with unknown capability "
1389                                             "%#" INT64_T_FORMAT "x = %#"
1390                                             INT64_T_FORMAT "x",
1391                                             (unsigned long long)xcap_tag,
1392                                             (unsigned long long)xcap_val) == -1)
1393                                                 return -1;
1394                                         if (nbadcap++ > 2)
1395                                                 coff = xsh_size;
1396                                         break;
1397                                 }
1398                         }
1399                         /*FALLTHROUGH*/
1400                 skip:
1401                 default:
1402                         break;
1403                 }
1404         }
1405
1406         if (has_debug_info) {
1407                 if (file_printf(ms, ", with debug_info") == -1)
1408                         return -1;
1409         }
1410         if (file_printf(ms, ", %sstripped", stripped ? "" : "not ") == -1)
1411                 return -1;
1412         if (cap_hw1) {
1413                 const cap_desc_t *cdp;
1414                 switch (mach) {
1415                 case EM_SPARC:
1416                 case EM_SPARC32PLUS:
1417                 case EM_SPARCV9:
1418                         cdp = cap_desc_sparc;
1419                         break;
1420                 case EM_386:
1421                 case EM_IA_64:
1422                 case EM_AMD64:
1423                         cdp = cap_desc_386;
1424                         break;
1425                 default:
1426                         cdp = NULL;
1427                         break;
1428                 }
1429                 if (file_printf(ms, ", uses") == -1)
1430                         return -1;
1431                 if (cdp) {
1432                         while (cdp->cd_name) {
1433                                 if (cap_hw1 & cdp->cd_mask) {
1434                                         if (file_printf(ms,
1435                                             " %s", cdp->cd_name) == -1)
1436                                                 return -1;
1437                                         cap_hw1 &= ~cdp->cd_mask;
1438                                 }
1439                                 ++cdp;
1440                         }
1441                         if (cap_hw1)
1442                                 if (file_printf(ms,
1443                                     " unknown hardware capability %#"
1444                                     INT64_T_FORMAT "x",
1445                                     (unsigned long long)cap_hw1) == -1)
1446                                         return -1;
1447                 } else {
1448                         if (file_printf(ms,
1449                             " hardware capability %#" INT64_T_FORMAT "x",
1450                             (unsigned long long)cap_hw1) == -1)
1451                                 return -1;
1452                 }
1453         }
1454         if (cap_sf1) {
1455                 if (cap_sf1 & SF1_SUNW_FPUSED) {
1456                         if (file_printf(ms,
1457                             (cap_sf1 & SF1_SUNW_FPKNWN)
1458                             ? ", uses frame pointer"
1459                             : ", not known to use frame pointer") == -1)
1460                                 return -1;
1461                 }
1462                 cap_sf1 &= ~SF1_SUNW_MASK;
1463                 if (cap_sf1)
1464                         if (file_printf(ms,
1465                             ", with unknown software capability %#"
1466                             INT64_T_FORMAT "x",
1467                             (unsigned long long)cap_sf1) == -1)
1468                                 return -1;
1469         }
1470         return 0;
1471 }
1472
1473 /*
1474  * Look through the program headers of an executable image, searching
1475  * for a PT_INTERP section; if one is found, it's dynamically linked,
1476  * otherwise it's statically linked.
1477  */
1478 private int
1479 dophn_exec(struct magic_set *ms, int clazz, int swap, int fd, off_t off,
1480     int num, size_t size, off_t fsize, int sh_num, int *flags,
1481     uint16_t *notecount)
1482 {
1483         Elf32_Phdr ph32;
1484         Elf64_Phdr ph64;
1485         const char *linking_style = "statically";
1486         const char *interp = "";
1487         unsigned char nbuf[BUFSIZ];
1488         char ibuf[BUFSIZ];
1489         ssize_t bufsize;
1490         size_t offset, align, len;
1491
1492         if (size != xph_sizeof) {
1493                 if (file_printf(ms, ", corrupted program header size") == -1)
1494                         return -1;
1495                 return 0;
1496         }
1497
1498         for ( ; num; num--) {
1499                 if (pread(fd, xph_addr, xph_sizeof, off) < (ssize_t)xph_sizeof) {
1500                         file_badread(ms);
1501                         return -1;
1502                 }
1503
1504                 off += size;
1505                 bufsize = 0;
1506                 align = 4;
1507
1508                 /* Things we can determine before we seek */
1509                 switch (xph_type) {
1510                 case PT_DYNAMIC:
1511                         linking_style = "dynamically";
1512                         break;
1513                 case PT_NOTE:
1514                         if (sh_num)     /* Did this through section headers */
1515                                 continue;
1516                         if (((align = xph_align) & 0x80000000UL) != 0 ||
1517                             align < 4) {
1518                                 if (file_printf(ms,
1519                                     ", invalid note alignment %#lx",
1520                                     (unsigned long)align) == -1)
1521                                         return -1;
1522                                 align = 4;
1523                         }
1524                         /*FALLTHROUGH*/
1525                 case PT_INTERP:
1526                         len = xph_filesz < sizeof(nbuf) ? xph_filesz
1527                             : sizeof(nbuf);
1528                         bufsize = pread(fd, nbuf, len, xph_offset);
1529                         if (bufsize == -1) {
1530                                 file_badread(ms);
1531                                 return -1;
1532                         }
1533                         break;
1534                 default:
1535                         if (fsize != SIZE_UNKNOWN && xph_offset > fsize) {
1536                                 /* Maybe warn here? */
1537                                 continue;
1538                         }
1539                         break;
1540                 }
1541
1542                 /* Things we can determine when we seek */
1543                 switch (xph_type) {
1544                 case PT_INTERP:
1545                         if (bufsize && nbuf[0]) {
1546                                 nbuf[bufsize - 1] = '\0';
1547                                 interp = (const char *)nbuf;
1548                         } else
1549                                 interp = "*empty*";
1550                         break;
1551                 case PT_NOTE:
1552                         /*
1553                          * This is a PT_NOTE section; loop through all the notes
1554                          * in the section.
1555                          */
1556                         offset = 0;
1557                         for (;;) {
1558                                 if (offset >= (size_t)bufsize)
1559                                         break;
1560                                 offset = donote(ms, nbuf, offset,
1561                                     (size_t)bufsize, clazz, swap, align,
1562                                     flags, notecount, fd, 0, 0, 0);
1563                                 if (offset == 0)
1564                                         break;
1565                         }
1566                         break;
1567                 default:
1568                         break;
1569                 }
1570         }
1571         if (file_printf(ms, ", %s linked", linking_style)
1572             == -1)
1573                 return -1;
1574         if (interp[0])
1575                 if (file_printf(ms, ", interpreter %s",
1576                     file_printable(ibuf, sizeof(ibuf), interp)) == -1)
1577                         return -1;
1578         return 0;
1579 }
1580
1581
1582 protected int
1583 file_tryelf(struct magic_set *ms, const struct buffer *b)
1584 {
1585         int fd = b->fd;
1586         const unsigned char *buf = b->fbuf;
1587         size_t nbytes = b->flen;
1588         union {
1589                 int32_t l;
1590                 char c[sizeof (int32_t)];
1591         } u;
1592         int clazz;
1593         int swap;
1594         struct stat st;
1595         off_t fsize;
1596         int flags = 0;
1597         Elf32_Ehdr elf32hdr;
1598         Elf64_Ehdr elf64hdr;
1599         uint16_t type, phnum, shnum, notecount;
1600
1601         if (ms->flags & (MAGIC_MIME|MAGIC_APPLE|MAGIC_EXTENSION))
1602                 return 0;
1603         /*
1604          * ELF executables have multiple section headers in arbitrary
1605          * file locations and thus file(1) cannot determine it from easily.
1606          * Instead we traverse thru all section headers until a symbol table
1607          * one is found or else the binary is stripped.
1608          * Return immediately if it's not ELF (so we avoid pipe2file unless needed).
1609          */
1610         if (buf[EI_MAG0] != ELFMAG0
1611             || (buf[EI_MAG1] != ELFMAG1 && buf[EI_MAG1] != OLFMAG1)
1612             || buf[EI_MAG2] != ELFMAG2 || buf[EI_MAG3] != ELFMAG3)
1613                 return 0;
1614
1615         /*
1616          * If we cannot seek, it must be a pipe, socket or fifo.
1617          */
1618         if((lseek(fd, (off_t)0, SEEK_SET) == (off_t)-1) && (errno == ESPIPE))
1619                 fd = file_pipe2file(ms, fd, buf, nbytes);
1620
1621         if (fstat(fd, &st) == -1) {
1622                 file_badread(ms);
1623                 return -1;
1624         }
1625         if (S_ISREG(st.st_mode) || st.st_size != 0)
1626                 fsize = st.st_size;
1627         else
1628                 fsize = SIZE_UNKNOWN;
1629
1630         clazz = buf[EI_CLASS];
1631
1632         switch (clazz) {
1633         case ELFCLASS32:
1634 #undef elf_getu
1635 #define elf_getu(a, b)  elf_getu32(a, b)
1636 #undef elfhdr
1637 #define elfhdr elf32hdr
1638 #include "elfclass.h"
1639         case ELFCLASS64:
1640 #undef elf_getu
1641 #define elf_getu(a, b)  elf_getu64(a, b)
1642 #undef elfhdr
1643 #define elfhdr elf64hdr
1644 #include "elfclass.h"
1645         default:
1646             if (file_printf(ms, ", unknown class %d", clazz) == -1)
1647                     return -1;
1648             break;
1649         }
1650         return 0;
1651 }
1652 #endif