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 1.138 2017/08/27 07:55:02 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                0x003
 314
 315 #define FLAGS_DID_CORE                  0x004
 316 #define FLAGS_DID_OS_NOTE               0x008
 317 #define FLAGS_DID_BUILD_ID              0x010
 318 #define FLAGS_DID_CORE_STYLE            0x020
 319 #define FLAGS_DID_NETBSD_PAX            0x040
 320 #define FLAGS_DID_NETBSD_MARCH          0x080
 321 #define FLAGS_DID_NETBSD_CMODEL         0x100
 322 #define FLAGS_DID_NETBSD_UNKNOWN        0x200
 323 #define FLAGS_IS_CORE                   0x400
 324 #define FLAGS_DID_AUXV                  0x800
 325
 326 private int
 327 dophn_core(struct magic_set *ms, int clazz, int swap, int fd, off_t off,
 328     int num, size_t size, off_t fsize, int *flags, uint16_t *notecount)
 329 {
 330         Elf32_Phdr ph32;
 331         Elf64_Phdr ph64;
 332         size_t offset, len;
 333         unsigned char nbuf[BUFSIZ];
 334         ssize_t bufsize;
 335         off_t ph_off = off;
 336         int ph_num = num;
 337
 338         if (size != xph_sizeof) {
 339                 if (file_printf(ms, ", corrupted program header size") == -1)
 340                         return -1;
 341                 return 0;
 342         }
 343
 344         /*
 345          * Loop through all the program headers.
 346          */
 347         for ( ; num; num--) {
 348                 if (pread(fd, xph_addr, xph_sizeof, off) < (ssize_t)xph_sizeof) {
 349                         file_badread(ms);
 350                         return -1;
 351                 }
 352                 off += size;
 353
 354                 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) {
 355                         /* Perhaps warn here */
 356                         continue;
 357                 }
 358
 359                 if (xph_type != PT_NOTE)
 360                         continue;
 361
 362                 /*
 363                  * This is a PT_NOTE section; loop through all the notes
 364                  * in the section.
 365                  */
 366                 len = xph_filesz < sizeof(nbuf) ? xph_filesz : sizeof(nbuf);
 367                 if ((bufsize = pread(fd, nbuf, len, xph_offset)) == -1) {
 368                         file_badread(ms);
 369                         return -1;
 370                 }
 371                 offset = 0;
 372                 for (;;) {
 373                         if (offset >= (size_t)bufsize)
 374                                 break;
 375                         offset = donote(ms, nbuf, offset, (size_t)bufsize,
 376                             clazz, swap, 4, flags, notecount, fd, ph_off,
 377                             ph_num, fsize);
 378                         if (offset == 0)
 379                                 break;
 380
 381                 }
 382         }
 383         return 0;
 384 }
 385 #endif
 386
 387 static void
 388 do_note_netbsd_version(struct magic_set *ms, int swap, void *v)
 389 {
 390         uint32_t desc;
 391         (void)memcpy(&desc, v, sizeof(desc));
 392         desc = elf_getu32(swap, desc);
 393
 394         if (file_printf(ms, ", for NetBSD") == -1)
 395                 return;
 396         /*
 397          * The version number used to be stuck as 199905, and was thus
 398          * basically content-free.  Newer versions of NetBSD have fixed
 399          * this and now use the encoding of __NetBSD_Version__:
 400          *
 401          *      MMmmrrpp00
 402          *
 403          * M = major version
 404          * m = minor version
 405          * r = release ["",A-Z,Z[A-Z] but numeric]
 406          * p = patchlevel
 407          */
 408         if (desc > 100000000U) {
 409                 uint32_t ver_patch = (desc / 100) % 100;
 410                 uint32_t ver_rel = (desc / 10000) % 100;
 411                 uint32_t ver_min = (desc / 1000000) % 100;
 412                 uint32_t ver_maj = desc / 100000000;
 413
 414                 if (file_printf(ms, " %u.%u", ver_maj, ver_min) == -1)
 415                         return;
 416                 if (ver_rel == 0 && ver_patch != 0) {
 417                         if (file_printf(ms, ".%u", ver_patch) == -1)
 418                                 return;
 419                 } else if (ver_rel != 0) {
 420                         while (ver_rel > 26) {
 421                                 if (file_printf(ms, "Z") == -1)
 422                                         return;
 423                                 ver_rel -= 26;
 424                         }
 425                         if (file_printf(ms, "%c", 'A' + ver_rel - 1)
 426                             == -1)
 427                                 return;
 428                 }
 429         }
 430 }
 431
 432 static void
 433 do_note_freebsd_version(struct magic_set *ms, int swap, void *v)
 434 {
 435         uint32_t desc;
 436
 437         (void)memcpy(&desc, v, sizeof(desc));
 438         desc = elf_getu32(swap, desc);
 439         if (file_printf(ms, ", for FreeBSD") == -1)
 440                 return;
 441
 442         /*
 443          * Contents is __FreeBSD_version, whose relation to OS
 444          * versions is defined by a huge table in the Porter's
 445          * Handbook.  This is the general scheme:
 446          *
 447          * Releases:
 448          *      Mmp000 (before 4.10)
 449          *      Mmi0p0 (before 5.0)
 450          *      Mmm0p0
 451          *
 452          * Development branches:
 453          *      Mmpxxx (before 4.6)
 454          *      Mmp1xx (before 4.10)
 455          *      Mmi1xx (before 5.0)
 456          *      M000xx (pre-M.0)
 457          *      Mmm1xx
 458          *
 459          * M = major version
 460          * m = minor version
 461          * i = minor version increment (491000 -> 4.10)
 462          * p = patchlevel
 463          * x = revision
 464          *
 465          * The first release of FreeBSD to use ELF by default
 466          * was version 3.0.
 467          */
 468         if (desc == 460002) {
 469                 if (file_printf(ms, " 4.6.2") == -1)
 470                         return;
 471         } else if (desc < 460100) {
 472                 if (file_printf(ms, " %d.%d", desc / 100000,
 473                     desc / 10000 % 10) == -1)
 474                         return;
 475                 if (desc / 1000 % 10 > 0)
 476                         if (file_printf(ms, ".%d", desc / 1000 % 10) == -1)
 477                                 return;
 478                 if ((desc % 1000 > 0) || (desc % 100000 == 0))
 479                         if (file_printf(ms, " (%d)", desc) == -1)
 480                                 return;
 481         } else if (desc < 500000) {
 482                 if (file_printf(ms, " %d.%d", desc / 100000,
 483                     desc / 10000 % 10 + desc / 1000 % 10) == -1)
 484                         return;
 485                 if (desc / 100 % 10 > 0) {
 486                         if (file_printf(ms, " (%d)", desc) == -1)
 487                                 return;
 488                 } else if (desc / 10 % 10 > 0) {
 489                         if (file_printf(ms, ".%d", desc / 10 % 10) == -1)
 490                                 return;
 491                 }
 492         } else {
 493                 if (file_printf(ms, " %d.%d", desc / 100000,
 494                     desc / 1000 % 100) == -1)
 495                         return;
 496                 if ((desc / 100 % 10 > 0) ||
 497                     (desc % 100000 / 100 == 0)) {
 498                         if (file_printf(ms, " (%d)", desc) == -1)
 499                                 return;
 500                 } else if (desc / 10 % 10 > 0) {
 501                         if (file_printf(ms, ".%d", desc / 10 % 10) == -1)
 502                                 return;
 503                 }
 504         }
 505 }
 506
 507 private int
 508 /*ARGSUSED*/
 509 do_bid_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type,
 510     int swap __attribute__((__unused__)), uint32_t namesz, uint32_t descsz,
 511     size_t noff, size_t doff, int *flags)
 512 {
 513         if (namesz == 4 && strcmp((char *)&nbuf[noff], "GNU") == 0 &&
 514             type == NT_GNU_BUILD_ID && (descsz >= 4 && descsz <= 20)) {
 515                 uint8_t desc[20];
 516                 const char *btype;
 517                 uint32_t i;
 518                 *flags |= FLAGS_DID_BUILD_ID;
 519                 switch (descsz) {
 520                 case 8:
 521                     btype = "xxHash";
 522                     break;
 523                 case 16:
 524                     btype = "md5/uuid";
 525                     break;
 526                 case 20:
 527                     btype = "sha1";
 528                     break;
 529                 default:
 530                     btype = "unknown";
 531                     break;
 532                 }
 533                 if (file_printf(ms, ", BuildID[%s]=", btype) == -1)
 534                         return 1;
 535                 (void)memcpy(desc, &nbuf[doff], descsz);
 536                 for (i = 0; i < descsz; i++)
 537                     if (file_printf(ms, "%02x", desc[i]) == -1)
 538                         return 1;
 539                 return 1;
 540         }
 541         return 0;
 542 }
 543
 544 private int
 545 do_os_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type,
 546     int swap, uint32_t namesz, uint32_t descsz,
 547     size_t noff, size_t doff, int *flags)
 548 {
 549         if (namesz == 5 && strcmp((char *)&nbuf[noff], "SuSE") == 0 &&
 550             type == NT_GNU_VERSION && descsz == 2) {
 551             *flags |= FLAGS_DID_OS_NOTE;
 552             file_printf(ms, ", for SuSE %d.%d", nbuf[doff], nbuf[doff + 1]);
 553             return 1;
 554         }
 555
 556         if (namesz == 4 && strcmp((char *)&nbuf[noff], "GNU") == 0 &&
 557             type == NT_GNU_VERSION && descsz == 16) {
 558                 uint32_t desc[4];
 559                 (void)memcpy(desc, &nbuf[doff], sizeof(desc));
 560
 561                 *flags |= FLAGS_DID_OS_NOTE;
 562                 if (file_printf(ms, ", for GNU/") == -1)
 563                         return 1;
 564                 switch (elf_getu32(swap, desc[0])) {
 565                 case GNU_OS_LINUX:
 566                         if (file_printf(ms, "Linux") == -1)
 567                                 return 1;
 568                         break;
 569                 case GNU_OS_HURD:
 570                         if (file_printf(ms, "Hurd") == -1)
 571                                 return 1;
 572                         break;
 573                 case GNU_OS_SOLARIS:
 574                         if (file_printf(ms, "Solaris") == -1)
 575                                 return 1;
 576                         break;
 577                 case GNU_OS_KFREEBSD:
 578                         if (file_printf(ms, "kFreeBSD") == -1)
 579                                 return 1;
 580                         break;
 581                 case GNU_OS_KNETBSD:
 582                         if (file_printf(ms, "kNetBSD") == -1)
 583                                 return 1;
 584                         break;
 585                 default:
 586                         if (file_printf(ms, "<unknown>") == -1)
 587                                 return 1;
 588                 }
 589                 if (file_printf(ms, " %d.%d.%d", elf_getu32(swap, desc[1]),
 590                     elf_getu32(swap, desc[2]), elf_getu32(swap, desc[3])) == -1)
 591                         return 1;
 592                 return 1;
 593         }
 594
 595         if (namesz == 7 && strcmp((char *)&nbuf[noff], "NetBSD") == 0) {
 596                 if (type == NT_NETBSD_VERSION && descsz == 4) {
 597                         *flags |= FLAGS_DID_OS_NOTE;
 598                         do_note_netbsd_version(ms, swap, &nbuf[doff]);
 599                         return 1;
 600                 }
 601         }
 602
 603         if (namesz == 8 && strcmp((char *)&nbuf[noff], "FreeBSD") == 0) {
 604                 if (type == NT_FREEBSD_VERSION && descsz == 4) {
 605                         *flags |= FLAGS_DID_OS_NOTE;
 606                         do_note_freebsd_version(ms, swap, &nbuf[doff]);
 607                         return 1;
 608                 }
 609         }
 610
 611         if (namesz == 8 && strcmp((char *)&nbuf[noff], "OpenBSD") == 0 &&
 612             type == NT_OPENBSD_VERSION && descsz == 4) {
 613                 *flags |= FLAGS_DID_OS_NOTE;
 614                 if (file_printf(ms, ", for OpenBSD") == -1)
 615                         return 1;
 616                 /* Content of note is always 0 */
 617                 return 1;
 618         }
 619
 620         if (namesz == 10 && strcmp((char *)&nbuf[noff], "DragonFly") == 0 &&
 621             type == NT_DRAGONFLY_VERSION && descsz == 4) {
 622                 uint32_t desc;
 623                 *flags |= FLAGS_DID_OS_NOTE;
 624                 if (file_printf(ms, ", for DragonFly") == -1)
 625                         return 1;
 626                 (void)memcpy(&desc, &nbuf[doff], sizeof(desc));
 627                 desc = elf_getu32(swap, desc);
 628                 if (file_printf(ms, " %d.%d.%d", desc / 100000,
 629                     desc / 10000 % 10, desc % 10000) == -1)
 630                         return 1;
 631                 return 1;
 632         }
 633         return 0;
 634 }
 635
 636 private int
 637 do_pax_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type,
 638     int swap, uint32_t namesz, uint32_t descsz,
 639     size_t noff, size_t doff, int *flags)
 640 {
 641         if (namesz == 4 && strcmp((char *)&nbuf[noff], "PaX") == 0 &&
 642             type == NT_NETBSD_PAX && descsz == 4) {
 643                 static const char *pax[] = {
 644                     "+mprotect",
 645                     "-mprotect",
 646                     "+segvguard",
 647                     "-segvguard",
 648                     "+ASLR",
 649                     "-ASLR",
 650                 };
 651                 uint32_t desc;
 652                 size_t i;
 653                 int did = 0;
 654
 655                 *flags |= FLAGS_DID_NETBSD_PAX;
 656                 (void)memcpy(&desc, &nbuf[doff], sizeof(desc));
 657                 desc = elf_getu32(swap, desc);
 658
 659                 if (desc && file_printf(ms, ", PaX: ") == -1)
 660                         return 1;
 661
 662                 for (i = 0; i < __arraycount(pax); i++) {
 663                         if (((1 << (int)i) & desc) == 0)
 664                                 continue;
 665                         if (file_printf(ms, "%s%s", did++ ? "," : "",
 666                             pax[i]) == -1)
 667                                 return 1;
 668                 }
 669                 return 1;
 670         }
 671         return 0;
 672 }
 673
 674 private int
 675 do_core_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type,
 676     int swap, uint32_t namesz, uint32_t descsz,
 677     size_t noff, size_t doff, int *flags, size_t size, int clazz)
 678 {
 679 #ifdef ELFCORE
 680         int os_style = -1;
 681         /*
 682          * Sigh.  The 2.0.36 kernel in Debian 2.1, at
 683          * least, doesn't correctly implement name
 684          * sections, in core dumps, as specified by
 685          * the "Program Linking" section of "UNIX(R) System
 686          * V Release 4 Programmer's Guide: ANSI C and
 687          * Programming Support Tools", because my copy
 688          * clearly says "The first 'namesz' bytes in 'name'
 689          * contain a *null-terminated* [emphasis mine]
 690          * character representation of the entry's owner
 691          * or originator", but the 2.0.36 kernel code
 692          * doesn't include the terminating null in the
 693          * name....
 694          */
 695         if ((namesz == 4 && strncmp((char *)&nbuf[noff], "CORE", 4) == 0) ||
 696             (namesz == 5 && strcmp((char *)&nbuf[noff], "CORE") == 0)) {
 697                 os_style = OS_STYLE_SVR4;
 698         }
 699
 700         if ((namesz == 8 && strcmp((char *)&nbuf[noff], "FreeBSD") == 0)) {
 701                 os_style = OS_STYLE_FREEBSD;
 702         }
 703
 704         if ((namesz >= 11 && strncmp((char *)&nbuf[noff], "NetBSD-CORE", 11)
 705             == 0)) {
 706                 os_style = OS_STYLE_NETBSD;
 707         }
 708
 709         if (os_style != -1 && (*flags & FLAGS_DID_CORE_STYLE) == 0) {
 710                 if (file_printf(ms, ", %s-style", os_style_names[os_style])
 711                     == -1)
 712                         return 1;
 713                 *flags |= FLAGS_DID_CORE_STYLE;
 714                 *flags |= os_style;
 715         }
 716
 717         switch (os_style) {
 718         case OS_STYLE_NETBSD:
 719                 if (type == NT_NETBSD_CORE_PROCINFO) {
 720                         char sbuf[512];
 721                         struct NetBSD_elfcore_procinfo pi;
 722                         memset(&pi, 0, sizeof(pi));
 723                         memcpy(&pi, nbuf + doff, descsz);
 724
 725                         if (file_printf(ms, ", from '%.31s', pid=%u, uid=%u, "
 726                             "gid=%u, nlwps=%u, lwp=%u (signal %u/code %u)",
 727                             file_printable(sbuf, sizeof(sbuf),
 728                             CAST(char *, pi.cpi_name)),
 729                             elf_getu32(swap, pi.cpi_pid),
 730                             elf_getu32(swap, pi.cpi_euid),
 731                             elf_getu32(swap, pi.cpi_egid),
 732                             elf_getu32(swap, pi.cpi_nlwps),
 733                             elf_getu32(swap, pi.cpi_siglwp),
 734                             elf_getu32(swap, pi.cpi_signo),
 735                             elf_getu32(swap, pi.cpi_sigcode)) == -1)
 736                                 return 1;
 737
 738                         *flags |= FLAGS_DID_CORE;
 739                         return 1;
 740                 }
 741                 break;
 742
 743         default:
 744                 if (type == NT_PRPSINFO && *flags & FLAGS_IS_CORE) {
 745                         size_t i, j;
 746                         unsigned char c;
 747                         /*
 748                          * Extract the program name.  We assume
 749                          * it to be 16 characters (that's what it
 750                          * is in SunOS 5.x and Linux).
 751                          *
 752                          * Unfortunately, it's at a different offset
 753                          * in various OSes, so try multiple offsets.
 754                          * If the characters aren't all printable,
 755                          * reject it.
 756                          */
 757                         for (i = 0; i < NOFFSETS; i++) {
 758                                 unsigned char *cname, *cp;
 759                                 size_t reloffset = prpsoffsets(i);
 760                                 size_t noffset = doff + reloffset;
 761                                 size_t k;
 762                                 for (j = 0; j < 16; j++, noffset++,
 763                                     reloffset++) {
 764                                         /*
 765                                          * Make sure we're not past
 766                                          * the end of the buffer; if
 767                                          * we are, just give up.
 768                                          */
 769                                         if (noffset >= size)
 770                                                 goto tryanother;
 771
 772                                         /*
 773                                          * Make sure we're not past
 774                                          * the end of the contents;
 775                                          * if we are, this obviously
 776                                          * isn't the right offset.
 777                                          */
 778                                         if (reloffset >= descsz)
 779                                                 goto tryanother;
 780
 781                                         c = nbuf[noffset];
 782                                         if (c == '\0') {
 783                                                 /*
 784                                                  * A '\0' at the
 785                                                  * beginning is
 786                                                  * obviously wrong.
 787                                                  * Any other '\0'
 788                                                  * means we're done.
 789                                                  */
 790                                                 if (j == 0)
 791                                                         goto tryanother;
 792                                                 else
 793                                                         break;
 794                                         } else {
 795                                                 /*
 796                                                  * A nonprintable
 797                                                  * character is also
 798                                                  * wrong.
 799                                                  */
 800                                                 if (!isprint(c) || isquote(c))
 801                                                         goto tryanother;
 802                                         }
 803                                 }
 804                                 /*
 805                                  * Well, that worked.
 806                                  */
 807
 808                                 /*
 809                                  * Try next offsets, in case this match is
 810                                  * in the middle of a string.
 811                                  */
 812                                 for (k = i + 1 ; k < NOFFSETS; k++) {
 813                                         size_t no;
 814                                         int adjust = 1;
 815                                         if (prpsoffsets(k) >= prpsoffsets(i))
 816                                                 continue;
 817                                         for (no = doff + prpsoffsets(k);
 818                                              no < doff + prpsoffsets(i); no++)
 819                                                 adjust = adjust
 820                                                          && isprint(nbuf[no]);
 821                                         if (adjust)
 822                                                 i = k;
 823                                 }
 824
 825                                 cname = (unsigned char *)
 826                                     &nbuf[doff + prpsoffsets(i)];
 827                                 for (cp = cname; *cp && isprint(*cp); cp++)
 828                                         continue;
 829                                 /*
 830                                  * Linux apparently appends a space at the end
 831                                  * of the command line: remove it.
 832                                  */
 833                                 while (cp > cname && isspace(cp[-1]))
 834                                         cp--;
 835                                 if (file_printf(ms, ", from '%.*s'",
 836                                     (int)(cp - cname), cname) == -1)
 837                                         return 1;
 838                                 *flags |= FLAGS_DID_CORE;
 839                                 return 1;
 840
 841                         tryanother:
 842                                 ;
 843                         }
 844                 }
 845                 break;
 846         }
 847 #endif
 848         return 0;
 849 }
 850
 851 private off_t
 852 get_offset_from_virtaddr(struct magic_set *ms, int swap, int clazz, int fd,
 853     off_t off, int num, off_t fsize, uint64_t virtaddr)
 854 {
 855         Elf32_Phdr ph32;
 856         Elf64_Phdr ph64;
 857
 858         /*
 859          * Loop through all the program headers and find the header with
 860          * virtual address in which the "virtaddr" belongs to.
 861          */
 862         for ( ; num; num--) {
 863                 if (pread(fd, xph_addr, xph_sizeof, off) < (ssize_t)xph_sizeof) {
 864                         file_badread(ms);
 865                         return -1;
 866                 }
 867                 off += xph_sizeof;
 868
 869                 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) {
 870                         /* Perhaps warn here */
 871                         continue;
 872                 }
 873
 874                 if (virtaddr >= xph_vaddr && virtaddr < xph_vaddr + xph_filesz)
 875                         return xph_offset + (virtaddr - xph_vaddr);
 876         }
 877         return 0;
 878 }
 879
 880 private size_t
 881 get_string_on_virtaddr(struct magic_set *ms,
 882     int swap, int clazz, int fd, off_t ph_off, int ph_num,
 883     off_t fsize, uint64_t virtaddr, char *buf, ssize_t buflen)
 884 {
 885         char *bptr;
 886         off_t offset;
 887
 888         if (buflen == 0)
 889                 return 0;
 890
 891         offset = get_offset_from_virtaddr(ms, swap, clazz, fd, ph_off, ph_num,
 892             fsize, virtaddr);
 893         if ((buflen = pread(fd, buf, CAST(size_t, buflen), offset)) <= 0) {
 894                 file_badread(ms);
 895                 return 0;
 896         }
 897
 898         buf[buflen - 1] = '\0';
 899
 900         /* We expect only printable characters, so return if buffer contains
 901          * non-printable character before the '\0' or just '\0'. */
 902         for (bptr = buf; *bptr && isprint((unsigned char)*bptr); bptr++)
 903                 continue;
 904         if (*bptr != '\0')
 905                 return 0;
 906
 907         return bptr - buf;
 908 }
 909
 910
 911 private int
 912 do_auxv_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type,
 913     int swap, uint32_t namesz __attribute__((__unused__)),
 914     uint32_t descsz __attribute__((__unused__)),
 915     size_t noff __attribute__((__unused__)), size_t doff,
 916     int *flags, size_t size __attribute__((__unused__)), int clazz,
 917     int fd, off_t ph_off, int ph_num, off_t fsize)
 918 {
 919 #ifdef ELFCORE
 920         Aux32Info auxv32;
 921         Aux64Info auxv64;
 922         size_t elsize = xauxv_sizeof;
 923         const char *tag;
 924         int is_string;
 925         size_t nval;
 926
 927         if ((*flags & (FLAGS_IS_CORE|FLAGS_DID_CORE_STYLE)) !=
 928             (FLAGS_IS_CORE|FLAGS_DID_CORE_STYLE))
 929                 return 0;
 930
 931         switch (*flags & FLAGS_CORE_STYLE) {
 932         case OS_STYLE_SVR4:
 933                 if (type != NT_AUXV)
 934                         return 0;
 935                 break;
 936 #ifdef notyet
 937         case OS_STYLE_NETBSD:
 938                 if (type != NT_NETBSD_CORE_AUXV)
 939                         return 0;
 940                 break;
 941         case OS_STYLE_FREEBSD:
 942                 if (type != NT_FREEBSD_PROCSTAT_AUXV)
 943                         return 0;
 944                 break;
 945 #endif
 946         default:
 947                 return 0;
 948         }
 949
 950         *flags |= FLAGS_DID_AUXV;
 951
 952         nval = 0;
 953         for (size_t off = 0; off + elsize <= descsz; off += elsize) {
 954                 (void)memcpy(xauxv_addr, &nbuf[doff + off], xauxv_sizeof);
 955                 /* Limit processing to 50 vector entries to prevent DoS */
 956                 if (nval++ >= 50) {
 957                         file_error(ms, 0, "Too many ELF Auxv elements");
 958                         return 1;
 959                 }
 960
 961                 switch(xauxv_type) {
 962                 case AT_LINUX_EXECFN:
 963                         is_string = 1;
 964                         tag = "execfn";
 965                         break;
 966                 case AT_LINUX_PLATFORM:
 967                         is_string = 1;
 968                         tag = "platform";
 969                         break;
 970                 case AT_LINUX_UID:
 971                         is_string = 0;
 972                         tag = "real uid";
 973                         break;
 974                 case AT_LINUX_GID:
 975                         is_string = 0;
 976                         tag = "real gid";
 977                         break;
 978                 case AT_LINUX_EUID:
 979                         is_string = 0;
 980                         tag = "effective uid";
 981                         break;
 982                 case AT_LINUX_EGID:
 983                         is_string = 0;
 984                         tag = "effective gid";
 985                         break;
 986                 default:
 987                         is_string = 0;
 988                         tag = NULL;
 989                         break;
 990                 }
 991
 992                 if (tag == NULL)
 993                         continue;
 994
 995                 if (is_string) {
 996                         char buf[256];
 997                         ssize_t buflen;
 998                         buflen = get_string_on_virtaddr(ms, swap, clazz, fd,
 999                             ph_off, ph_num, fsize, xauxv_val, buf, sizeof(buf));
1000
1001                         if (buflen == 0)
1002                                 continue;
1003
1004                         if (file_printf(ms, ", %s: '%s'", tag, buf) == -1)
1005                                 return 0;
1006                 } else {
1007                         if (file_printf(ms, ", %s: %d", tag, (int) xauxv_val)
1008                             == -1)
1009                                 return 0;
1010                 }
1011         }
1012         return 1;
1013 #else
1014         return 0;
1015 #endif
1016 }
1017
1018 private size_t
1019 donote(struct magic_set *ms, void *vbuf, size_t offset, size_t size,
1020     int clazz, int swap, size_t align, int *flags, uint16_t *notecount,
1021     int fd, off_t ph_off, int ph_num, off_t fsize)
1022 {
1023         Elf32_Nhdr nh32;
1024         Elf64_Nhdr nh64;
1025         size_t noff, doff;
1026         uint32_t namesz, descsz;
1027         unsigned char *nbuf = CAST(unsigned char *, vbuf);
1028
1029         if (*notecount == 0)
1030                 return 0;
1031         --*notecount;
1032
1033         if (xnh_sizeof + offset > size) {
1034                 /*
1035                  * We're out of note headers.
1036                  */
1037                 return xnh_sizeof + offset;
1038         }
1039
1040         (void)memcpy(xnh_addr, &nbuf[offset], xnh_sizeof);
1041         offset += xnh_sizeof;
1042
1043         namesz = xnh_namesz;
1044         descsz = xnh_descsz;
1045
1046         if ((namesz == 0) && (descsz == 0)) {
1047                 /*
1048                  * We're out of note headers.
1049                  */
1050                 return (offset >= size) ? offset : size;
1051         }
1052
1053         if (namesz & 0x80000000) {
1054             (void)file_printf(ms, ", bad note name size %#lx",
1055                 (unsigned long)namesz);
1056             return 0;
1057         }
1058
1059         if (descsz & 0x80000000) {
1060             (void)file_printf(ms, ", bad note description size %#lx",
1061                 (unsigned long)descsz);
1062             return 0;
1063         }
1064
1065         noff = offset;
1066         doff = ELF_ALIGN(offset + namesz);
1067
1068         if (offset + namesz > size) {
1069                 /*
1070                  * We're past the end of the buffer.
1071                  */
1072                 return doff;
1073         }
1074
1075         offset = ELF_ALIGN(doff + descsz);
1076         if (doff + descsz > size) {
1077                 /*
1078                  * We're past the end of the buffer.
1079                  */
1080                 return (offset >= size) ? offset : size;
1081         }
1082
1083
1084         if ((*flags & FLAGS_DID_OS_NOTE) == 0) {
1085                 if (do_os_note(ms, nbuf, xnh_type, swap,
1086                     namesz, descsz, noff, doff, flags))
1087                         return offset;
1088         }
1089
1090         if ((*flags & FLAGS_DID_BUILD_ID) == 0) {
1091                 if (do_bid_note(ms, nbuf, xnh_type, swap,
1092                     namesz, descsz, noff, doff, flags))
1093                         return offset;
1094         }
1095
1096         if ((*flags & FLAGS_DID_NETBSD_PAX) == 0) {
1097                 if (do_pax_note(ms, nbuf, xnh_type, swap,
1098                     namesz, descsz, noff, doff, flags))
1099                         return offset;
1100         }
1101
1102         if ((*flags & FLAGS_DID_CORE) == 0) {
1103                 if (do_core_note(ms, nbuf, xnh_type, swap,
1104                     namesz, descsz, noff, doff, flags, size, clazz))
1105                         return offset;
1106         }
1107
1108         if ((*flags & FLAGS_DID_AUXV) == 0) {
1109                 if (do_auxv_note(ms, nbuf, xnh_type, swap,
1110                         namesz, descsz, noff, doff, flags, size, clazz,
1111                         fd, ph_off, ph_num, fsize))
1112                         return offset;
1113         }
1114
1115         if (namesz == 7 && strcmp((char *)&nbuf[noff], "NetBSD") == 0) {
1116                 if (descsz > 100)
1117                         descsz = 100;
1118                 switch (xnh_type) {
1119                 case NT_NETBSD_VERSION:
1120                         return offset;
1121                 case NT_NETBSD_MARCH:
1122                         if (*flags & FLAGS_DID_NETBSD_MARCH)
1123                                 return offset;
1124                         *flags |= FLAGS_DID_NETBSD_MARCH;
1125                         if (file_printf(ms, ", compiled for: %.*s",
1126                             (int)descsz, (const char *)&nbuf[doff]) == -1)
1127                                 return offset;
1128                         break;
1129                 case NT_NETBSD_CMODEL:
1130                         if (*flags & FLAGS_DID_NETBSD_CMODEL)
1131                                 return offset;
1132                         *flags |= FLAGS_DID_NETBSD_CMODEL;
1133                         if (file_printf(ms, ", compiler model: %.*s",
1134                             (int)descsz, (const char *)&nbuf[doff]) == -1)
1135                                 return offset;
1136                         break;
1137                 default:
1138                         if (*flags & FLAGS_DID_NETBSD_UNKNOWN)
1139                                 return offset;
1140                         *flags |= FLAGS_DID_NETBSD_UNKNOWN;
1141                         if (file_printf(ms, ", note=%u", xnh_type) == -1)
1142                                 return offset;
1143                         break;
1144                 }
1145                 return offset;
1146         }
1147
1148         return offset;
1149 }
1150
1151 /* SunOS 5.x hardware capability descriptions */
1152 typedef struct cap_desc {
1153         uint64_t cd_mask;
1154         const char *cd_name;
1155 } cap_desc_t;
1156
1157 static const cap_desc_t cap_desc_sparc[] = {
1158         { AV_SPARC_MUL32,               "MUL32" },
1159         { AV_SPARC_DIV32,               "DIV32" },
1160         { AV_SPARC_FSMULD,              "FSMULD" },
1161         { AV_SPARC_V8PLUS,              "V8PLUS" },
1162         { AV_SPARC_POPC,                "POPC" },
1163         { AV_SPARC_VIS,                 "VIS" },
1164         { AV_SPARC_VIS2,                "VIS2" },
1165         { AV_SPARC_ASI_BLK_INIT,        "ASI_BLK_INIT" },
1166         { AV_SPARC_FMAF,                "FMAF" },
1167         { AV_SPARC_FJFMAU,              "FJFMAU" },
1168         { AV_SPARC_IMA,                 "IMA" },
1169         { 0, NULL }
1170 };
1171
1172 static const cap_desc_t cap_desc_386[] = {
1173         { AV_386_FPU,                   "FPU" },
1174         { AV_386_TSC,                   "TSC" },
1175         { AV_386_CX8,                   "CX8" },
1176         { AV_386_SEP,                   "SEP" },
1177         { AV_386_AMD_SYSC,              "AMD_SYSC" },
1178         { AV_386_CMOV,                  "CMOV" },
1179         { AV_386_MMX,                   "MMX" },
1180         { AV_386_AMD_MMX,               "AMD_MMX" },
1181         { AV_386_AMD_3DNow,             "AMD_3DNow" },
1182         { AV_386_AMD_3DNowx,            "AMD_3DNowx" },
1183         { AV_386_FXSR,                  "FXSR" },
1184         { AV_386_SSE,                   "SSE" },
1185         { AV_386_SSE2,                  "SSE2" },
1186         { AV_386_PAUSE,                 "PAUSE" },
1187         { AV_386_SSE3,                  "SSE3" },
1188         { AV_386_MON,                   "MON" },
1189         { AV_386_CX16,                  "CX16" },
1190         { AV_386_AHF,                   "AHF" },
1191         { AV_386_TSCP,                  "TSCP" },
1192         { AV_386_AMD_SSE4A,             "AMD_SSE4A" },
1193         { AV_386_POPCNT,                "POPCNT" },
1194         { AV_386_AMD_LZCNT,             "AMD_LZCNT" },
1195         { AV_386_SSSE3,                 "SSSE3" },
1196         { AV_386_SSE4_1,                "SSE4.1" },
1197         { AV_386_SSE4_2,                "SSE4.2" },
1198         { 0, NULL }
1199 };
1200
1201 private int
1202 doshn(struct magic_set *ms, int clazz, int swap, int fd, off_t off, int num,
1203     size_t size, off_t fsize, int mach, int strtab, int *flags,
1204     uint16_t *notecount)
1205 {
1206         Elf32_Shdr sh32;
1207         Elf64_Shdr sh64;
1208         int stripped = 1, has_debug_info = 0;
1209         size_t nbadcap = 0;
1210         void *nbuf;
1211         off_t noff, coff, name_off;
1212         uint64_t cap_hw1 = 0;   /* SunOS 5.x hardware capabilities */
1213         uint64_t cap_sf1 = 0;   /* SunOS 5.x software capabilities */
1214         char name[50];
1215         ssize_t namesize;
1216
1217         if (size != xsh_sizeof) {
1218                 if (file_printf(ms, ", corrupted section header size") == -1)
1219                         return -1;
1220                 return 0;
1221         }
1222
1223         /* Read offset of name section to be able to read section names later */
1224         if (pread(fd, xsh_addr, xsh_sizeof, CAST(off_t, (off + size * strtab)))
1225             < (ssize_t)xsh_sizeof) {
1226                 if (file_printf(ms, ", missing section headers") == -1)
1227                         return -1;
1228                 return 0;
1229         }
1230         name_off = xsh_offset;
1231
1232         for ( ; num; num--) {
1233                 /* Read the name of this section. */
1234                 if ((namesize = pread(fd, name, sizeof(name) - 1, name_off + xsh_name)) == -1) {
1235                         file_badread(ms);
1236                         return -1;
1237                 }
1238                 name[namesize] = '\0';
1239                 if (strcmp(name, ".debug_info") == 0) {
1240                         has_debug_info = 1;
1241                         stripped = 0;
1242                 }
1243
1244                 if (pread(fd, xsh_addr, xsh_sizeof, off) < (ssize_t)xsh_sizeof) {
1245                         file_badread(ms);
1246                         return -1;
1247                 }
1248                 off += size;
1249
1250                 /* Things we can determine before we seek */
1251                 switch (xsh_type) {
1252                 case SHT_SYMTAB:
1253 #if 0
1254                 case SHT_DYNSYM:
1255 #endif
1256                         stripped = 0;
1257                         break;
1258                 default:
1259                         if (fsize != SIZE_UNKNOWN && xsh_offset > fsize) {
1260                                 /* Perhaps warn here */
1261                                 continue;
1262                         }
1263                         break;
1264                 }
1265
1266
1267                 /* Things we can determine when we seek */
1268                 switch (xsh_type) {
1269                 case SHT_NOTE:
1270                         if ((uintmax_t)(xsh_size + xsh_offset) >
1271                             (uintmax_t)fsize) {
1272                                 if (file_printf(ms,
1273                                     ", note offset/size %#" INTMAX_T_FORMAT
1274                                     "x+%#" INTMAX_T_FORMAT "x exceeds"
1275                                     " file size %#" INTMAX_T_FORMAT "x",
1276                                     (uintmax_t)xsh_offset, (uintmax_t)xsh_size,
1277                                     (uintmax_t)fsize) == -1)
1278                                         return -1;
1279                                 return 0;
1280                         }
1281                         if ((nbuf = malloc(xsh_size)) == NULL) {
1282                                 file_error(ms, errno, "Cannot allocate memory"
1283                                     " for note");
1284                                 return -1;
1285                         }
1286                         if (pread(fd, nbuf, xsh_size, xsh_offset) <
1287                             (ssize_t)xsh_size) {
1288                                 file_badread(ms);
1289                                 free(nbuf);
1290                                 return -1;
1291                         }
1292
1293                         noff = 0;
1294                         for (;;) {
1295                                 if (noff >= (off_t)xsh_size)
1296                                         break;
1297                                 noff = donote(ms, nbuf, (size_t)noff,
1298                                     xsh_size, clazz, swap, 4, flags, notecount,
1299                                     fd, 0, 0, 0);
1300                                 if (noff == 0)
1301                                         break;
1302                         }
1303                         free(nbuf);
1304                         break;
1305                 case SHT_SUNW_cap:
1306                         switch (mach) {
1307                         case EM_SPARC:
1308                         case EM_SPARCV9:
1309                         case EM_IA_64:
1310                         case EM_386:
1311                         case EM_AMD64:
1312                                 break;
1313                         default:
1314                                 goto skip;
1315                         }
1316
1317                         if (nbadcap > 5)
1318                                 break;
1319                         if (lseek(fd, xsh_offset, SEEK_SET) == (off_t)-1) {
1320                                 file_badseek(ms);
1321                                 return -1;
1322                         }
1323                         coff = 0;
1324                         for (;;) {
1325                                 Elf32_Cap cap32;
1326                                 Elf64_Cap cap64;
1327                                 char cbuf[/*CONSTCOND*/
1328                                     MAX(sizeof cap32, sizeof cap64)];
1329                                 if ((coff += xcap_sizeof) > (off_t)xsh_size)
1330                                         break;
1331                                 if (read(fd, cbuf, (size_t)xcap_sizeof) !=
1332                                     (ssize_t)xcap_sizeof) {
1333                                         file_badread(ms);
1334                                         return -1;
1335                                 }
1336                                 if (cbuf[0] == 'A') {
1337 #ifdef notyet
1338                                         char *p = cbuf + 1;
1339                                         uint32_t len, tag;
1340                                         memcpy(&len, p, sizeof(len));
1341                                         p += 4;
1342                                         len = getu32(swap, len);
1343                                         if (memcmp("gnu", p, 3) != 0) {
1344                                             if (file_printf(ms,
1345                                                 ", unknown capability %.3s", p)
1346                                                 == -1)
1347                                                 return -1;
1348                                             break;
1349                                         }
1350                                         p += strlen(p) + 1;
1351                                         tag = *p++;
1352                                         memcpy(&len, p, sizeof(len));
1353                                         p += 4;
1354                                         len = getu32(swap, len);
1355                                         if (tag != 1) {
1356                                             if (file_printf(ms, ", unknown gnu"
1357                                                 " capability tag %d", tag)
1358                                                 == -1)
1359                                                 return -1;
1360                                             break;
1361                                         }
1362                                         // gnu attributes
1363 #endif
1364                                         break;
1365                                 }
1366                                 (void)memcpy(xcap_addr, cbuf, xcap_sizeof);
1367                                 switch (xcap_tag) {
1368                                 case CA_SUNW_NULL:
1369                                         break;
1370                                 case CA_SUNW_HW_1:
1371                                         cap_hw1 |= xcap_val;
1372                                         break;
1373                                 case CA_SUNW_SF_1:
1374                                         cap_sf1 |= xcap_val;
1375                                         break;
1376                                 default:
1377                                         if (file_printf(ms,
1378                                             ", with unknown capability "
1379                                             "%#" INT64_T_FORMAT "x = %#"
1380                                             INT64_T_FORMAT "x",
1381                                             (unsigned long long)xcap_tag,
1382                                             (unsigned long long)xcap_val) == -1)
1383                                                 return -1;
1384                                         if (nbadcap++ > 2)
1385                                                 coff = xsh_size;
1386                                         break;
1387                                 }
1388                         }
1389                         /*FALLTHROUGH*/
1390                 skip:
1391                 default:
1392                         break;
1393                 }
1394         }
1395
1396         if (has_debug_info) {
1397                 if (file_printf(ms, ", with debug_info") == -1)
1398                         return -1;
1399         }
1400         if (file_printf(ms, ", %sstripped", stripped ? "" : "not ") == -1)
1401                 return -1;
1402         if (cap_hw1) {
1403                 const cap_desc_t *cdp;
1404                 switch (mach) {
1405                 case EM_SPARC:
1406                 case EM_SPARC32PLUS:
1407                 case EM_SPARCV9:
1408                         cdp = cap_desc_sparc;
1409                         break;
1410                 case EM_386:
1411                 case EM_IA_64:
1412                 case EM_AMD64:
1413                         cdp = cap_desc_386;
1414                         break;
1415                 default:
1416                         cdp = NULL;
1417                         break;
1418                 }
1419                 if (file_printf(ms, ", uses") == -1)
1420                         return -1;
1421                 if (cdp) {
1422                         while (cdp->cd_name) {
1423                                 if (cap_hw1 & cdp->cd_mask) {
1424                                         if (file_printf(ms,
1425                                             " %s", cdp->cd_name) == -1)
1426                                                 return -1;
1427                                         cap_hw1 &= ~cdp->cd_mask;
1428                                 }
1429                                 ++cdp;
1430                         }
1431                         if (cap_hw1)
1432                                 if (file_printf(ms,
1433                                     " unknown hardware capability %#"
1434                                     INT64_T_FORMAT "x",
1435                                     (unsigned long long)cap_hw1) == -1)
1436                                         return -1;
1437                 } else {
1438                         if (file_printf(ms,
1439                             " hardware capability %#" INT64_T_FORMAT "x",
1440                             (unsigned long long)cap_hw1) == -1)
1441                                 return -1;
1442                 }
1443         }
1444         if (cap_sf1) {
1445                 if (cap_sf1 & SF1_SUNW_FPUSED) {
1446                         if (file_printf(ms,
1447                             (cap_sf1 & SF1_SUNW_FPKNWN)
1448                             ? ", uses frame pointer"
1449                             : ", not known to use frame pointer") == -1)
1450                                 return -1;
1451                 }
1452                 cap_sf1 &= ~SF1_SUNW_MASK;
1453                 if (cap_sf1)
1454                         if (file_printf(ms,
1455                             ", with unknown software capability %#"
1456                             INT64_T_FORMAT "x",
1457                             (unsigned long long)cap_sf1) == -1)
1458                                 return -1;
1459         }
1460         return 0;
1461 }
1462
1463 /*
1464  * Look through the program headers of an executable image, searching
1465  * for a PT_INTERP section; if one is found, it's dynamically linked,
1466  * otherwise it's statically linked.
1467  */
1468 private int
1469 dophn_exec(struct magic_set *ms, int clazz, int swap, int fd, off_t off,
1470     int num, size_t size, off_t fsize, int sh_num, int *flags,
1471     uint16_t *notecount)
1472 {
1473         Elf32_Phdr ph32;
1474         Elf64_Phdr ph64;
1475         const char *linking_style = "statically";
1476         const char *interp = "";
1477         unsigned char nbuf[BUFSIZ];
1478         char ibuf[BUFSIZ];
1479         ssize_t bufsize;
1480         size_t offset, align, len;
1481
1482         if (size != xph_sizeof) {
1483                 if (file_printf(ms, ", corrupted program header size") == -1)
1484                         return -1;
1485                 return 0;
1486         }
1487
1488         for ( ; num; num--) {
1489                 if (pread(fd, xph_addr, xph_sizeof, off) < (ssize_t)xph_sizeof) {
1490                         file_badread(ms);
1491                         return -1;
1492                 }
1493
1494                 off += size;
1495                 bufsize = 0;
1496                 align = 4;
1497
1498                 /* Things we can determine before we seek */
1499                 switch (xph_type) {
1500                 case PT_DYNAMIC:
1501                         linking_style = "dynamically";
1502                         break;
1503                 case PT_NOTE:
1504                         if (sh_num)     /* Did this through section headers */
1505                                 continue;
1506                         if (((align = xph_align) & 0x80000000UL) != 0 ||
1507                             align < 4) {
1508                                 if (file_printf(ms,
1509                                     ", invalid note alignment %#lx",
1510                                     (unsigned long)align) == -1)
1511                                         return -1;
1512                                 align = 4;
1513                         }
1514                         /*FALLTHROUGH*/
1515                 case PT_INTERP:
1516                         len = xph_filesz < sizeof(nbuf) ? xph_filesz
1517                             : sizeof(nbuf);
1518                         bufsize = pread(fd, nbuf, len, xph_offset);
1519                         if (bufsize == -1) {
1520                                 file_badread(ms);
1521                                 return -1;
1522                         }
1523                         break;
1524                 default:
1525                         if (fsize != SIZE_UNKNOWN && xph_offset > fsize) {
1526                                 /* Maybe warn here? */
1527                                 continue;
1528                         }
1529                         break;
1530                 }
1531
1532                 /* Things we can determine when we seek */
1533                 switch (xph_type) {
1534                 case PT_INTERP:
1535                         if (bufsize && nbuf[0]) {
1536                                 nbuf[bufsize - 1] = '\0';
1537                                 interp = (const char *)nbuf;
1538                         } else
1539                                 interp = "*empty*";
1540                         break;
1541                 case PT_NOTE:
1542                         /*
1543                          * This is a PT_NOTE section; loop through all the notes
1544                          * in the section.
1545                          */
1546                         offset = 0;
1547                         for (;;) {
1548                                 if (offset >= (size_t)bufsize)
1549                                         break;
1550                                 offset = donote(ms, nbuf, offset,
1551                                     (size_t)bufsize, clazz, swap, align,
1552                                     flags, notecount, fd, 0, 0, 0);
1553                                 if (offset == 0)
1554                                         break;
1555                         }
1556                         break;
1557                 default:
1558                         break;
1559                 }
1560         }
1561         if (file_printf(ms, ", %s linked", linking_style)
1562             == -1)
1563                 return -1;
1564         if (interp[0])
1565                 if (file_printf(ms, ", interpreter %s",
1566                     file_printable(ibuf, sizeof(ibuf), interp)) == -1)
1567                         return -1;
1568         return 0;
1569 }
1570
1571
1572 protected int
1573 file_tryelf(struct magic_set *ms, int fd, const unsigned char *buf,
1574     size_t nbytes)
1575 {
1576         union {
1577                 int32_t l;
1578                 char c[sizeof (int32_t)];
1579         } u;
1580         int clazz;
1581         int swap;
1582         struct stat st;
1583         off_t fsize;
1584         int flags = 0;
1585         Elf32_Ehdr elf32hdr;
1586         Elf64_Ehdr elf64hdr;
1587         uint16_t type, phnum, shnum, notecount;
1588
1589         if (ms->flags & (MAGIC_MIME|MAGIC_APPLE|MAGIC_EXTENSION))
1590                 return 0;
1591         /*
1592          * ELF executables have multiple section headers in arbitrary
1593          * file locations and thus file(1) cannot determine it from easily.
1594          * Instead we traverse thru all section headers until a symbol table
1595          * one is found or else the binary is stripped.
1596          * Return immediately if it's not ELF (so we avoid pipe2file unless needed).
1597          */
1598         if (buf[EI_MAG0] != ELFMAG0
1599             || (buf[EI_MAG1] != ELFMAG1 && buf[EI_MAG1] != OLFMAG1)
1600             || buf[EI_MAG2] != ELFMAG2 || buf[EI_MAG3] != ELFMAG3)
1601                 return 0;
1602
1603         /*
1604          * If we cannot seek, it must be a pipe, socket or fifo.
1605          */
1606         if((lseek(fd, (off_t)0, SEEK_SET) == (off_t)-1) && (errno == ESPIPE))
1607                 fd = file_pipe2file(ms, fd, buf, nbytes);
1608
1609         if (fstat(fd, &st) == -1) {
1610                 file_badread(ms);
1611                 return -1;
1612         }
1613         if (S_ISREG(st.st_mode) || st.st_size != 0)
1614                 fsize = st.st_size;
1615         else
1616                 fsize = SIZE_UNKNOWN;
1617
1618         clazz = buf[EI_CLASS];
1619
1620         switch (clazz) {
1621         case ELFCLASS32:
1622 #undef elf_getu
1623 #define elf_getu(a, b)  elf_getu32(a, b)
1624 #undef elfhdr
1625 #define elfhdr elf32hdr
1626 #include "elfclass.h"
1627         case ELFCLASS64:
1628 #undef elf_getu
1629 #define elf_getu(a, b)  elf_getu64(a, b)
1630 #undef elfhdr
1631 #define elfhdr elf64hdr
1632 #include "elfclass.h"
1633         default:
1634             if (file_printf(ms, ", unknown class %d", clazz) == -1)
1635                     return -1;
1636             break;
1637         }
1638         return 0;
1639 }
1640 #endif