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 1.117 2014/12/16 23:29:42 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 *);
  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_filesz      (size_t)((clazz == ELFCLASS32           \
 181                          ? elf_getu32(swap, ph32.p_filesz)      \
 182                          : elf_getu64(swap, ph64.p_filesz)))
 183 #define xnh_addr        (clazz == ELFCLASS32                    \
 184                          ? (void *)&nh32                        \
 185                          : (void *)&nh64)
 186 #define xph_memsz       (size_t)((clazz == ELFCLASS32           \
 187                          ? elf_getu32(swap, ph32.p_memsz)       \
 188                          : elf_getu64(swap, ph64.p_memsz)))
 189 #define xnh_sizeof      (clazz == ELFCLASS32                    \
 190                          ? sizeof nh32                          \
 191                          : sizeof nh64)
 192 #define xnh_type        (clazz == ELFCLASS32                    \
 193                          ? elf_getu32(swap, nh32.n_type)        \
 194                          : elf_getu32(swap, nh64.n_type))
 195 #define xnh_namesz      (clazz == ELFCLASS32                    \
 196                          ? elf_getu32(swap, nh32.n_namesz)      \
 197                          : elf_getu32(swap, nh64.n_namesz))
 198 #define xnh_descsz      (clazz == ELFCLASS32                    \
 199                          ? elf_getu32(swap, nh32.n_descsz)      \
 200                          : elf_getu32(swap, nh64.n_descsz))
 201 #define prpsoffsets(i)  (clazz == ELFCLASS32                    \
 202                          ? prpsoffsets32[i]                     \
 203                          : prpsoffsets64[i])
 204 #define xcap_addr       (clazz == ELFCLASS32                    \
 205                          ? (void *)&cap32                       \
 206                          : (void *)&cap64)
 207 #define xcap_sizeof     (clazz == ELFCLASS32                    \
 208                          ? sizeof cap32                         \
 209                          : sizeof cap64)
 210 #define xcap_tag        (clazz == ELFCLASS32                    \
 211                          ? elf_getu32(swap, cap32.c_tag)        \
 212                          : elf_getu64(swap, cap64.c_tag))
 213 #define xcap_val        (clazz == ELFCLASS32                    \
 214                          ? elf_getu32(swap, cap32.c_un.c_val)   \
 215                          : elf_getu64(swap, cap64.c_un.c_val))
 216
 217 #ifdef ELFCORE
 218 /*
 219  * Try larger offsets first to avoid false matches
 220  * from earlier data that happen to look like strings.
 221  */
 222 static const size_t     prpsoffsets32[] = {
 223 #ifdef USE_NT_PSINFO
 224         104,            /* SunOS 5.x (command line) */
 225         88,             /* SunOS 5.x (short name) */
 226 #endif /* USE_NT_PSINFO */
 227
 228         100,            /* SunOS 5.x (command line) */
 229         84,             /* SunOS 5.x (short name) */
 230
 231         44,             /* Linux (command line) */
 232         28,             /* Linux 2.0.36 (short name) */
 233
 234         8,              /* FreeBSD */
 235 };
 236
 237 static const size_t     prpsoffsets64[] = {
 238 #ifdef USE_NT_PSINFO
 239         152,            /* SunOS 5.x (command line) */
 240         136,            /* SunOS 5.x (short name) */
 241 #endif /* USE_NT_PSINFO */
 242
 243         136,            /* SunOS 5.x, 64-bit (command line) */
 244         120,            /* SunOS 5.x, 64-bit (short name) */
 245
 246         56,             /* Linux (command line) */
 247         40,             /* Linux (tested on core from 2.4.x, short name) */
 248
 249         16,             /* FreeBSD, 64-bit */
 250 };
 251
 252 #define NOFFSETS32      (sizeof prpsoffsets32 / sizeof prpsoffsets32[0])
 253 #define NOFFSETS64      (sizeof prpsoffsets64 / sizeof prpsoffsets64[0])
 254
 255 #define NOFFSETS        (clazz == ELFCLASS32 ? NOFFSETS32 : NOFFSETS64)
 256
 257 /*
 258  * Look through the program headers of an executable image, searching
 259  * for a PT_NOTE section of type NT_PRPSINFO, with a name "CORE" or
 260  * "FreeBSD"; if one is found, try looking in various places in its
 261  * contents for a 16-character string containing only printable
 262  * characters - if found, that string should be the name of the program
 263  * that dropped core.  Note: right after that 16-character string is,
 264  * at least in SunOS 5.x (and possibly other SVR4-flavored systems) and
 265  * Linux, a longer string (80 characters, in 5.x, probably other
 266  * SVR4-flavored systems, and Linux) containing the start of the
 267  * command line for that program.
 268  *
 269  * SunOS 5.x core files contain two PT_NOTE sections, with the types
 270  * NT_PRPSINFO (old) and NT_PSINFO (new).  These structs contain the
 271  * same info about the command name and command line, so it probably
 272  * isn't worthwhile to look for NT_PSINFO, but the offsets are provided
 273  * above (see USE_NT_PSINFO), in case we ever decide to do so.  The
 274  * NT_PRPSINFO and NT_PSINFO sections are always in order and adjacent;
 275  * the SunOS 5.x file command relies on this (and prefers the latter).
 276  *
 277  * The signal number probably appears in a section of type NT_PRSTATUS,
 278  * but that's also rather OS-dependent, in ways that are harder to
 279  * dissect with heuristics, so I'm not bothering with the signal number.
 280  * (I suppose the signal number could be of interest in situations where
 281  * you don't have the binary of the program that dropped core; if you
 282  * *do* have that binary, the debugger will probably tell you what
 283  * signal it was.)
 284  */
 285
 286 #define OS_STYLE_SVR4           0
 287 #define OS_STYLE_FREEBSD        1
 288 #define OS_STYLE_NETBSD         2
 289
 290 private const char os_style_names[][8] = {
 291         "SVR4",
 292         "FreeBSD",
 293         "NetBSD",
 294 };
 295
 296 #define FLAGS_DID_CORE                  0x001
 297 #define FLAGS_DID_OS_NOTE               0x002
 298 #define FLAGS_DID_BUILD_ID              0x004
 299 #define FLAGS_DID_CORE_STYLE            0x008
 300 #define FLAGS_DID_NETBSD_PAX            0x010
 301 #define FLAGS_DID_NETBSD_MARCH          0x020
 302 #define FLAGS_DID_NETBSD_CMODEL         0x040
 303 #define FLAGS_DID_NETBSD_UNKNOWN        0x080
 304 #define FLAGS_IS_CORE                   0x100
 305
 306 private int
 307 dophn_core(struct magic_set *ms, int clazz, int swap, int fd, off_t off,
 308     int num, size_t size, off_t fsize, int *flags, uint16_t *notecount)
 309 {
 310         Elf32_Phdr ph32;
 311         Elf64_Phdr ph64;
 312         size_t offset, len;
 313         unsigned char nbuf[BUFSIZ];
 314         ssize_t bufsize;
 315
 316         if (size != xph_sizeof) {
 317                 if (file_printf(ms, ", corrupted program header size") == -1)
 318                         return -1;
 319                 return 0;
 320         }
 321
 322         /*
 323          * Loop through all the program headers.
 324          */
 325         for ( ; num; num--) {
 326                 if (pread(fd, xph_addr, xph_sizeof, off) < (ssize_t)xph_sizeof) {
 327                         file_badread(ms);
 328                         return -1;
 329                 }
 330                 off += size;
 331
 332                 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) {
 333                         /* Perhaps warn here */
 334                         continue;
 335                 }
 336
 337                 if (xph_type != PT_NOTE)
 338                         continue;
 339
 340                 /*
 341                  * This is a PT_NOTE section; loop through all the notes
 342                  * in the section.
 343                  */
 344                 len = xph_filesz < sizeof(nbuf) ? xph_filesz : sizeof(nbuf);
 345                 if ((bufsize = pread(fd, nbuf, len, xph_offset)) == -1) {
 346                         file_badread(ms);
 347                         return -1;
 348                 }
 349                 offset = 0;
 350                 for (;;) {
 351                         if (offset >= (size_t)bufsize)
 352                                 break;
 353                         offset = donote(ms, nbuf, offset, (size_t)bufsize,
 354                             clazz, swap, 4, flags, notecount);
 355                         if (offset == 0)
 356                                 break;
 357
 358                 }
 359         }
 360         return 0;
 361 }
 362 #endif
 363
 364 static void
 365 do_note_netbsd_version(struct magic_set *ms, int swap, void *v)
 366 {
 367         uint32_t desc;
 368         (void)memcpy(&desc, v, sizeof(desc));
 369         desc = elf_getu32(swap, desc);
 370
 371         if (file_printf(ms, ", for NetBSD") == -1)
 372                 return;
 373         /*
 374          * The version number used to be stuck as 199905, and was thus
 375          * basically content-free.  Newer versions of NetBSD have fixed
 376          * this and now use the encoding of __NetBSD_Version__:
 377          *
 378          *      MMmmrrpp00
 379          *
 380          * M = major version
 381          * m = minor version
 382          * r = release ["",A-Z,Z[A-Z] but numeric]
 383          * p = patchlevel
 384          */
 385         if (desc > 100000000U) {
 386                 uint32_t ver_patch = (desc / 100) % 100;
 387                 uint32_t ver_rel = (desc / 10000) % 100;
 388                 uint32_t ver_min = (desc / 1000000) % 100;
 389                 uint32_t ver_maj = desc / 100000000;
 390
 391                 if (file_printf(ms, " %u.%u", ver_maj, ver_min) == -1)
 392                         return;
 393                 if (ver_rel == 0 && ver_patch != 0) {
 394                         if (file_printf(ms, ".%u", ver_patch) == -1)
 395                                 return;
 396                 } else if (ver_rel != 0) {
 397                         while (ver_rel > 26) {
 398                                 if (file_printf(ms, "Z") == -1)
 399                                         return;
 400                                 ver_rel -= 26;
 401                         }
 402                         if (file_printf(ms, "%c", 'A' + ver_rel - 1)
 403                             == -1)
 404                                 return;
 405                 }
 406         }
 407 }
 408
 409 static void
 410 do_note_freebsd_version(struct magic_set *ms, int swap, void *v)
 411 {
 412         uint32_t desc;
 413
 414         (void)memcpy(&desc, v, sizeof(desc));
 415         desc = elf_getu32(swap, desc);
 416         if (file_printf(ms, ", for FreeBSD") == -1)
 417                 return;
 418
 419         /*
 420          * Contents is __FreeBSD_version, whose relation to OS
 421          * versions is defined by a huge table in the Porter's
 422          * Handbook.  This is the general scheme:
 423          *
 424          * Releases:
 425          *      Mmp000 (before 4.10)
 426          *      Mmi0p0 (before 5.0)
 427          *      Mmm0p0
 428          *
 429          * Development branches:
 430          *      Mmpxxx (before 4.6)
 431          *      Mmp1xx (before 4.10)
 432          *      Mmi1xx (before 5.0)
 433          *      M000xx (pre-M.0)
 434          *      Mmm1xx
 435          *
 436          * M = major version
 437          * m = minor version
 438          * i = minor version increment (491000 -> 4.10)
 439          * p = patchlevel
 440          * x = revision
 441          *
 442          * The first release of FreeBSD to use ELF by default
 443          * was version 3.0.
 444          */
 445         if (desc == 460002) {
 446                 if (file_printf(ms, " 4.6.2") == -1)
 447                         return;
 448         } else if (desc < 460100) {
 449                 if (file_printf(ms, " %d.%d", desc / 100000,
 450                     desc / 10000 % 10) == -1)
 451                         return;
 452                 if (desc / 1000 % 10 > 0)
 453                         if (file_printf(ms, ".%d", desc / 1000 % 10) == -1)
 454                                 return;
 455                 if ((desc % 1000 > 0) || (desc % 100000 == 0))
 456                         if (file_printf(ms, " (%d)", desc) == -1)
 457                                 return;
 458         } else if (desc < 500000) {
 459                 if (file_printf(ms, " %d.%d", desc / 100000,
 460                     desc / 10000 % 10 + desc / 1000 % 10) == -1)
 461                         return;
 462                 if (desc / 100 % 10 > 0) {
 463                         if (file_printf(ms, " (%d)", desc) == -1)
 464                                 return;
 465                 } else if (desc / 10 % 10 > 0) {
 466                         if (file_printf(ms, ".%d", desc / 10 % 10) == -1)
 467                                 return;
 468                 }
 469         } else {
 470                 if (file_printf(ms, " %d.%d", desc / 100000,
 471                     desc / 1000 % 100) == -1)
 472                         return;
 473                 if ((desc / 100 % 10 > 0) ||
 474                     (desc % 100000 / 100 == 0)) {
 475                         if (file_printf(ms, " (%d)", desc) == -1)
 476                                 return;
 477                 } else if (desc / 10 % 10 > 0) {
 478                         if (file_printf(ms, ".%d", desc / 10 % 10) == -1)
 479                                 return;
 480                 }
 481         }
 482 }
 483
 484 private int
 485 do_bid_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type,
 486     int swap __attribute__((__unused__)), uint32_t namesz, uint32_t descsz,
 487     size_t noff, size_t doff, int *flags)
 488 {
 489         if (namesz == 4 && strcmp((char *)&nbuf[noff], "GNU") == 0 &&
 490             type == NT_GNU_BUILD_ID && (descsz == 16 || descsz == 20)) {
 491                 uint8_t desc[20];
 492                 uint32_t i;
 493                 *flags |= FLAGS_DID_BUILD_ID;
 494                 if (file_printf(ms, ", BuildID[%s]=", descsz == 16 ? "md5/uuid" :
 495                     "sha1") == -1)
 496                         return 1;
 497                 (void)memcpy(desc, &nbuf[doff], descsz);
 498                 for (i = 0; i < descsz; i++)
 499                     if (file_printf(ms, "%02x", desc[i]) == -1)
 500                         return 1;
 501                 return 1;
 502         }
 503         return 0;
 504 }
 505
 506 private int
 507 do_os_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type,
 508     int swap, uint32_t namesz, uint32_t descsz,
 509     size_t noff, size_t doff, int *flags)
 510 {
 511         if (namesz == 5 && strcmp((char *)&nbuf[noff], "SuSE") == 0 &&
 512             type == NT_GNU_VERSION && descsz == 2) {
 513             *flags |= FLAGS_DID_OS_NOTE;
 514             file_printf(ms, ", for SuSE %d.%d", nbuf[doff], nbuf[doff + 1]);
 515             return 1;
 516         }
 517
 518         if (namesz == 4 && strcmp((char *)&nbuf[noff], "GNU") == 0 &&
 519             type == NT_GNU_VERSION && descsz == 16) {
 520                 uint32_t desc[4];
 521                 (void)memcpy(desc, &nbuf[doff], sizeof(desc));
 522
 523                 *flags |= FLAGS_DID_OS_NOTE;
 524                 if (file_printf(ms, ", for GNU/") == -1)
 525                         return 1;
 526                 switch (elf_getu32(swap, desc[0])) {
 527                 case GNU_OS_LINUX:
 528                         if (file_printf(ms, "Linux") == -1)
 529                                 return 1;
 530                         break;
 531                 case GNU_OS_HURD:
 532                         if (file_printf(ms, "Hurd") == -1)
 533                                 return 1;
 534                         break;
 535                 case GNU_OS_SOLARIS:
 536                         if (file_printf(ms, "Solaris") == -1)
 537                                 return 1;
 538                         break;
 539                 case GNU_OS_KFREEBSD:
 540                         if (file_printf(ms, "kFreeBSD") == -1)
 541                                 return 1;
 542                         break;
 543                 case GNU_OS_KNETBSD:
 544                         if (file_printf(ms, "kNetBSD") == -1)
 545                                 return 1;
 546                         break;
 547                 default:
 548                         if (file_printf(ms, "<unknown>") == -1)
 549                                 return 1;
 550                 }
 551                 if (file_printf(ms, " %d.%d.%d", elf_getu32(swap, desc[1]),
 552                     elf_getu32(swap, desc[2]), elf_getu32(swap, desc[3])) == -1)
 553                         return 1;
 554                 return 1;
 555         }
 556
 557         if (namesz == 7 && strcmp((char *)&nbuf[noff], "NetBSD") == 0) {
 558                 if (type == NT_NETBSD_VERSION && descsz == 4) {
 559                         *flags |= FLAGS_DID_OS_NOTE;
 560                         do_note_netbsd_version(ms, swap, &nbuf[doff]);
 561                         return 1;
 562                 }
 563         }
 564
 565         if (namesz == 8 && strcmp((char *)&nbuf[noff], "FreeBSD") == 0) {
 566                 if (type == NT_FREEBSD_VERSION && descsz == 4) {
 567                         *flags |= FLAGS_DID_OS_NOTE;
 568                         do_note_freebsd_version(ms, swap, &nbuf[doff]);
 569                         return 1;
 570                 }
 571         }
 572
 573         if (namesz == 8 && strcmp((char *)&nbuf[noff], "OpenBSD") == 0 &&
 574             type == NT_OPENBSD_VERSION && descsz == 4) {
 575                 *flags |= FLAGS_DID_OS_NOTE;
 576                 if (file_printf(ms, ", for OpenBSD") == -1)
 577                         return 1;
 578                 /* Content of note is always 0 */
 579                 return 1;
 580         }
 581
 582         if (namesz == 10 && strcmp((char *)&nbuf[noff], "DragonFly") == 0 &&
 583             type == NT_DRAGONFLY_VERSION && descsz == 4) {
 584                 uint32_t desc;
 585                 *flags |= FLAGS_DID_OS_NOTE;
 586                 if (file_printf(ms, ", for DragonFly") == -1)
 587                         return 1;
 588                 (void)memcpy(&desc, &nbuf[doff], sizeof(desc));
 589                 desc = elf_getu32(swap, desc);
 590                 if (file_printf(ms, " %d.%d.%d", desc / 100000,
 591                     desc / 10000 % 10, desc % 10000) == -1)
 592                         return 1;
 593                 return 1;
 594         }
 595         return 0;
 596 }
 597
 598 private int
 599 do_pax_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type,
 600     int swap, uint32_t namesz, uint32_t descsz,
 601     size_t noff, size_t doff, int *flags)
 602 {
 603         if (namesz == 4 && strcmp((char *)&nbuf[noff], "PaX") == 0 &&
 604             type == NT_NETBSD_PAX && descsz == 4) {
 605                 static const char *pax[] = {
 606                     "+mprotect",
 607                     "-mprotect",
 608                     "+segvguard",
 609                     "-segvguard",
 610                     "+ASLR",
 611                     "-ASLR",
 612                 };
 613                 uint32_t desc;
 614                 size_t i;
 615                 int did = 0;
 616
 617                 *flags |= FLAGS_DID_NETBSD_PAX;
 618                 (void)memcpy(&desc, &nbuf[doff], sizeof(desc));
 619                 desc = elf_getu32(swap, desc);
 620
 621                 if (desc && file_printf(ms, ", PaX: ") == -1)
 622                         return 1;
 623
 624                 for (i = 0; i < __arraycount(pax); i++) {
 625                         if (((1 << i) & desc) == 0)
 626                                 continue;
 627                         if (file_printf(ms, "%s%s", did++ ? "," : "",
 628                             pax[i]) == -1)
 629                                 return 1;
 630                 }
 631                 return 1;
 632         }
 633         return 0;
 634 }
 635
 636 private int
 637 do_core_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, size_t size, int clazz)
 640 {
 641 #ifdef ELFCORE
 642         int os_style = -1;
 643         /*
 644          * Sigh.  The 2.0.36 kernel in Debian 2.1, at
 645          * least, doesn't correctly implement name
 646          * sections, in core dumps, as specified by
 647          * the "Program Linking" section of "UNIX(R) System
 648          * V Release 4 Programmer's Guide: ANSI C and
 649          * Programming Support Tools", because my copy
 650          * clearly says "The first 'namesz' bytes in 'name'
 651          * contain a *null-terminated* [emphasis mine]
 652          * character representation of the entry's owner
 653          * or originator", but the 2.0.36 kernel code
 654          * doesn't include the terminating null in the
 655          * name....
 656          */
 657         if ((namesz == 4 && strncmp((char *)&nbuf[noff], "CORE", 4) == 0) ||
 658             (namesz == 5 && strcmp((char *)&nbuf[noff], "CORE") == 0)) {
 659                 os_style = OS_STYLE_SVR4;
 660         }
 661
 662         if ((namesz == 8 && strcmp((char *)&nbuf[noff], "FreeBSD") == 0)) {
 663                 os_style = OS_STYLE_FREEBSD;
 664         }
 665
 666         if ((namesz >= 11 && strncmp((char *)&nbuf[noff], "NetBSD-CORE", 11)
 667             == 0)) {
 668                 os_style = OS_STYLE_NETBSD;
 669         }
 670
 671         if (os_style != -1 && (*flags & FLAGS_DID_CORE_STYLE) == 0) {
 672                 if (file_printf(ms, ", %s-style", os_style_names[os_style])
 673                     == -1)
 674                         return 1;
 675                 *flags |= FLAGS_DID_CORE_STYLE;
 676         }
 677
 678         switch (os_style) {
 679         case OS_STYLE_NETBSD:
 680                 if (type == NT_NETBSD_CORE_PROCINFO) {
 681                         char sbuf[512];
 682                         uint32_t signo;
 683                         /*
 684                          * Extract the program name.  It is at
 685                          * offset 0x7c, and is up to 32-bytes,
 686                          * including the terminating NUL.
 687                          */
 688                         if (file_printf(ms, ", from '%.31s'",
 689                             file_printable(sbuf, sizeof(sbuf),
 690                             (const char *)&nbuf[doff + 0x7c])) == -1)
 691                                 return 1;
 692
 693                         /*
 694                          * Extract the signal number.  It is at
 695                          * offset 0x08.
 696                          */
 697                         (void)memcpy(&signo, &nbuf[doff + 0x08],
 698                             sizeof(signo));
 699                         if (file_printf(ms, " (signal %u)",
 700                             elf_getu32(swap, signo)) == -1)
 701                                 return 1;
 702                         *flags |= FLAGS_DID_CORE;
 703                         return 1;
 704                 }
 705                 break;
 706
 707         default:
 708                 if (type == NT_PRPSINFO && *flags & FLAGS_IS_CORE) {
 709                         size_t i, j;
 710                         unsigned char c;
 711                         /*
 712                          * Extract the program name.  We assume
 713                          * it to be 16 characters (that's what it
 714                          * is in SunOS 5.x and Linux).
 715                          *
 716                          * Unfortunately, it's at a different offset
 717                          * in various OSes, so try multiple offsets.
 718                          * If the characters aren't all printable,
 719                          * reject it.
 720                          */
 721                         for (i = 0; i < NOFFSETS; i++) {
 722                                 unsigned char *cname, *cp;
 723                                 size_t reloffset = prpsoffsets(i);
 724                                 size_t noffset = doff + reloffset;
 725                                 size_t k;
 726                                 for (j = 0; j < 16; j++, noffset++,
 727                                     reloffset++) {
 728                                         /*
 729                                          * Make sure we're not past
 730                                          * the end of the buffer; if
 731                                          * we are, just give up.
 732                                          */
 733                                         if (noffset >= size)
 734                                                 goto tryanother;
 735
 736                                         /*
 737                                          * Make sure we're not past
 738                                          * the end of the contents;
 739                                          * if we are, this obviously
 740                                          * isn't the right offset.
 741                                          */
 742                                         if (reloffset >= descsz)
 743                                                 goto tryanother;
 744
 745                                         c = nbuf[noffset];
 746                                         if (c == '\0') {
 747                                                 /*
 748                                                  * A '\0' at the
 749                                                  * beginning is
 750                                                  * obviously wrong.
 751                                                  * Any other '\0'
 752                                                  * means we're done.
 753                                                  */
 754                                                 if (j == 0)
 755                                                         goto tryanother;
 756                                                 else
 757                                                         break;
 758                                         } else {
 759                                                 /*
 760                                                  * A nonprintable
 761                                                  * character is also
 762                                                  * wrong.
 763                                                  */
 764                                                 if (!isprint(c) || isquote(c))
 765                                                         goto tryanother;
 766                                         }
 767                                 }
 768                                 /*
 769                                  * Well, that worked.
 770                                  */
 771
 772                                 /*
 773                                  * Try next offsets, in case this match is
 774                                  * in the middle of a string.
 775                                  */
 776                                 for (k = i + 1 ; k < NOFFSETS; k++) {
 777                                         size_t no;
 778                                         int adjust = 1;
 779                                         if (prpsoffsets(k) >= prpsoffsets(i))
 780                                                 continue;
 781                                         for (no = doff + prpsoffsets(k);
 782                                              no < doff + prpsoffsets(i); no++)
 783                                                 adjust = adjust
 784                                                          && isprint(nbuf[no]);
 785                                         if (adjust)
 786                                                 i = k;
 787                                 }
 788
 789                                 cname = (unsigned char *)
 790                                     &nbuf[doff + prpsoffsets(i)];
 791                                 for (cp = cname; *cp && isprint(*cp); cp++)
 792                                         continue;
 793                                 /*
 794                                  * Linux apparently appends a space at the end
 795                                  * of the command line: remove it.
 796                                  */
 797                                 while (cp > cname && isspace(cp[-1]))
 798                                         cp--;
 799                                 if (file_printf(ms, ", from '%.*s'",
 800                                     (int)(cp - cname), cname) == -1)
 801                                         return 1;
 802                                 *flags |= FLAGS_DID_CORE;
 803                                 return 1;
 804
 805                         tryanother:
 806                                 ;
 807                         }
 808                 }
 809                 break;
 810         }
 811 #endif
 812         return 0;
 813 }
 814
 815 private size_t
 816 donote(struct magic_set *ms, void *vbuf, size_t offset, size_t size,
 817     int clazz, int swap, size_t align, int *flags, uint16_t *notecount)
 818 {
 819         Elf32_Nhdr nh32;
 820         Elf64_Nhdr nh64;
 821         size_t noff, doff;
 822         uint32_t namesz, descsz;
 823         unsigned char *nbuf = CAST(unsigned char *, vbuf);
 824
 825         if (*notecount == 0)
 826                 return 0;
 827         --*notecount;
 828
 829         if (xnh_sizeof + offset > size) {
 830                 /*
 831                  * We're out of note headers.
 832                  */
 833                 return xnh_sizeof + offset;
 834         }
 835
 836         (void)memcpy(xnh_addr, &nbuf[offset], xnh_sizeof);
 837         offset += xnh_sizeof;
 838
 839         namesz = xnh_namesz;
 840         descsz = xnh_descsz;
 841         if ((namesz == 0) && (descsz == 0)) {
 842                 /*
 843                  * We're out of note headers.
 844                  */
 845                 return (offset >= size) ? offset : size;
 846         }
 847
 848         if (namesz & 0x80000000) {
 849             (void)file_printf(ms, ", bad note name size 0x%lx",
 850                 (unsigned long)namesz);
 851             return 0;
 852         }
 853
 854         if (descsz & 0x80000000) {
 855             (void)file_printf(ms, ", bad note description size 0x%lx",
 856                 (unsigned long)descsz);
 857             return 0;
 858         }
 859
 860         noff = offset;
 861         doff = ELF_ALIGN(offset + namesz);
 862
 863         if (offset + namesz > size) {
 864                 /*
 865                  * We're past the end of the buffer.
 866                  */
 867                 return doff;
 868         }
 869
 870         offset = ELF_ALIGN(doff + descsz);
 871         if (doff + descsz > size) {
 872                 /*
 873                  * We're past the end of the buffer.
 874                  */
 875                 return (offset >= size) ? offset : size;
 876         }
 877
 878         if ((*flags & FLAGS_DID_OS_NOTE) == 0) {
 879                 if (do_os_note(ms, nbuf, xnh_type, swap,
 880                     namesz, descsz, noff, doff, flags))
 881                         return size;
 882         }
 883
 884         if ((*flags & FLAGS_DID_BUILD_ID) == 0) {
 885                 if (do_bid_note(ms, nbuf, xnh_type, swap,
 886                     namesz, descsz, noff, doff, flags))
 887                         return size;
 888         }
 889
 890         if ((*flags & FLAGS_DID_NETBSD_PAX) == 0) {
 891                 if (do_pax_note(ms, nbuf, xnh_type, swap,
 892                     namesz, descsz, noff, doff, flags))
 893                         return size;
 894         }
 895
 896         if ((*flags & FLAGS_DID_CORE) == 0) {
 897                 if (do_core_note(ms, nbuf, xnh_type, swap,
 898                     namesz, descsz, noff, doff, flags, size, clazz))
 899                         return size;
 900         }
 901
 902         if (namesz == 7 && strcmp((char *)&nbuf[noff], "NetBSD") == 0) {
 903                 if (descsz > 100)
 904                         descsz = 100;
 905                 switch (xnh_type) {
 906                 case NT_NETBSD_VERSION:
 907                         return size;
 908                 case NT_NETBSD_MARCH:
 909                         if (*flags & FLAGS_DID_NETBSD_MARCH)
 910                                 return size;
 911                         *flags |= FLAGS_DID_NETBSD_MARCH;
 912                         if (file_printf(ms, ", compiled for: %.*s",
 913                             (int)descsz, (const char *)&nbuf[doff]) == -1)
 914                                 return size;
 915                         break;
 916                 case NT_NETBSD_CMODEL:
 917                         if (*flags & FLAGS_DID_NETBSD_CMODEL)
 918                                 return size;
 919                         *flags |= FLAGS_DID_NETBSD_CMODEL;
 920                         if (file_printf(ms, ", compiler model: %.*s",
 921                             (int)descsz, (const char *)&nbuf[doff]) == -1)
 922                                 return size;
 923                         break;
 924                 default:
 925                         if (*flags & FLAGS_DID_NETBSD_UNKNOWN)
 926                                 return size;
 927                         *flags |= FLAGS_DID_NETBSD_UNKNOWN;
 928                         if (file_printf(ms, ", note=%u", xnh_type) == -1)
 929                                 return size;
 930                         break;
 931                 }
 932                 return size;
 933         }
 934
 935         return offset;
 936 }
 937
 938 /* SunOS 5.x hardware capability descriptions */
 939 typedef struct cap_desc {
 940         uint64_t cd_mask;
 941         const char *cd_name;
 942 } cap_desc_t;
 943
 944 static const cap_desc_t cap_desc_sparc[] = {
 945         { AV_SPARC_MUL32,               "MUL32" },
 946         { AV_SPARC_DIV32,               "DIV32" },
 947         { AV_SPARC_FSMULD,              "FSMULD" },
 948         { AV_SPARC_V8PLUS,              "V8PLUS" },
 949         { AV_SPARC_POPC,                "POPC" },
 950         { AV_SPARC_VIS,                 "VIS" },
 951         { AV_SPARC_VIS2,                "VIS2" },
 952         { AV_SPARC_ASI_BLK_INIT,        "ASI_BLK_INIT" },
 953         { AV_SPARC_FMAF,                "FMAF" },
 954         { AV_SPARC_FJFMAU,              "FJFMAU" },
 955         { AV_SPARC_IMA,                 "IMA" },
 956         { 0, NULL }
 957 };
 958
 959 static const cap_desc_t cap_desc_386[] = {
 960         { AV_386_FPU,                   "FPU" },
 961         { AV_386_TSC,                   "TSC" },
 962         { AV_386_CX8,                   "CX8" },
 963         { AV_386_SEP,                   "SEP" },
 964         { AV_386_AMD_SYSC,              "AMD_SYSC" },
 965         { AV_386_CMOV,                  "CMOV" },
 966         { AV_386_MMX,                   "MMX" },
 967         { AV_386_AMD_MMX,               "AMD_MMX" },
 968         { AV_386_AMD_3DNow,             "AMD_3DNow" },
 969         { AV_386_AMD_3DNowx,            "AMD_3DNowx" },
 970         { AV_386_FXSR,                  "FXSR" },
 971         { AV_386_SSE,                   "SSE" },
 972         { AV_386_SSE2,                  "SSE2" },
 973         { AV_386_PAUSE,                 "PAUSE" },
 974         { AV_386_SSE3,                  "SSE3" },
 975         { AV_386_MON,                   "MON" },
 976         { AV_386_CX16,                  "CX16" },
 977         { AV_386_AHF,                   "AHF" },
 978         { AV_386_TSCP,                  "TSCP" },
 979         { AV_386_AMD_SSE4A,             "AMD_SSE4A" },
 980         { AV_386_POPCNT,                "POPCNT" },
 981         { AV_386_AMD_LZCNT,             "AMD_LZCNT" },
 982         { AV_386_SSSE3,                 "SSSE3" },
 983         { AV_386_SSE4_1,                "SSE4.1" },
 984         { AV_386_SSE4_2,                "SSE4.2" },
 985         { 0, NULL }
 986 };
 987
 988 private int
 989 doshn(struct magic_set *ms, int clazz, int swap, int fd, off_t off, int num,
 990     size_t size, off_t fsize, int mach, int strtab, int *flags,
 991     uint16_t *notecount)
 992 {
 993         Elf32_Shdr sh32;
 994         Elf64_Shdr sh64;
 995         int stripped = 1;
 996         size_t nbadcap = 0;
 997         void *nbuf;
 998         off_t noff, coff, name_off;
 999         uint64_t cap_hw1 = 0;   /* SunOS 5.x hardware capabilites */
1000         uint64_t cap_sf1 = 0;   /* SunOS 5.x software capabilites */
1001         char name[50];
1002         ssize_t namesize;
1003
1004         if (size != xsh_sizeof) {
1005                 if (file_printf(ms, ", corrupted section header size") == -1)
1006                         return -1;
1007                 return 0;
1008         }
1009
1010         /* Read offset of name section to be able to read section names later */
1011         if (pread(fd, xsh_addr, xsh_sizeof, off + size * strtab) < (ssize_t)xsh_sizeof) {
1012                 file_badread(ms);
1013                 return -1;
1014         }
1015         name_off = xsh_offset;
1016
1017         for ( ; num; num--) {
1018                 /* Read the name of this section. */
1019                 if ((namesize = pread(fd, name, sizeof(name) - 1, name_off + xsh_name)) == -1) {
1020                         file_badread(ms);
1021                         return -1;
1022                 }
1023                 name[namesize] = '\0';
1024                 if (strcmp(name, ".debug_info") == 0)
1025                         stripped = 0;
1026
1027                 if (pread(fd, xsh_addr, xsh_sizeof, off) < (ssize_t)xsh_sizeof) {
1028                         file_badread(ms);
1029                         return -1;
1030                 }
1031                 off += size;
1032
1033                 /* Things we can determine before we seek */
1034                 switch (xsh_type) {
1035                 case SHT_SYMTAB:
1036 #if 0
1037                 case SHT_DYNSYM:
1038 #endif
1039                         stripped = 0;
1040                         break;
1041                 default:
1042                         if (fsize != SIZE_UNKNOWN && xsh_offset > fsize) {
1043                                 /* Perhaps warn here */
1044                                 continue;
1045                         }
1046                         break;
1047                 }
1048
1049                 /* Things we can determine when we seek */
1050                 switch (xsh_type) {
1051                 case SHT_NOTE:
1052                         if ((nbuf = malloc(xsh_size)) == NULL) {
1053                                 file_error(ms, errno, "Cannot allocate memory"
1054                                     " for note");
1055                                 return -1;
1056                         }
1057                         if (pread(fd, nbuf, xsh_size, xsh_offset) < (ssize_t)xsh_size) {
1058                                 file_badread(ms);
1059                                 free(nbuf);
1060                                 return -1;
1061                         }
1062
1063                         noff = 0;
1064                         for (;;) {
1065                                 if (noff >= (off_t)xsh_size)
1066                                         break;
1067                                 noff = donote(ms, nbuf, (size_t)noff,
1068                                     xsh_size, clazz, swap, 4, flags, notecount);
1069                                 if (noff == 0)
1070                                         break;
1071                         }
1072                         free(nbuf);
1073                         break;
1074                 case SHT_SUNW_cap:
1075                         switch (mach) {
1076                         case EM_SPARC:
1077                         case EM_SPARCV9:
1078                         case EM_IA_64:
1079                         case EM_386:
1080                         case EM_AMD64:
1081                                 break;
1082                         default:
1083                                 goto skip;
1084                         }
1085
1086                         if (nbadcap > 5)
1087                                 break;
1088                         if (lseek(fd, xsh_offset, SEEK_SET) == (off_t)-1) {
1089                                 file_badseek(ms);
1090                                 return -1;
1091                         }
1092                         coff = 0;
1093                         for (;;) {
1094                                 Elf32_Cap cap32;
1095                                 Elf64_Cap cap64;
1096                                 char cbuf[/*CONSTCOND*/
1097                                     MAX(sizeof cap32, sizeof cap64)];
1098                                 if ((coff += xcap_sizeof) > (off_t)xsh_size)
1099                                         break;
1100                                 if (read(fd, cbuf, (size_t)xcap_sizeof) !=
1101                                     (ssize_t)xcap_sizeof) {
1102                                         file_badread(ms);
1103                                         return -1;
1104                                 }
1105                                 if (cbuf[0] == 'A') {
1106 #ifdef notyet
1107                                         char *p = cbuf + 1;
1108                                         uint32_t len, tag;
1109                                         memcpy(&len, p, sizeof(len));
1110                                         p += 4;
1111                                         len = getu32(swap, len);
1112                                         if (memcmp("gnu", p, 3) != 0) {
1113                                             if (file_printf(ms,
1114                                                 ", unknown capability %.3s", p)
1115                                                 == -1)
1116                                                 return -1;
1117                                             break;
1118                                         }
1119                                         p += strlen(p) + 1;
1120                                         tag = *p++;
1121                                         memcpy(&len, p, sizeof(len));
1122                                         p += 4;
1123                                         len = getu32(swap, len);
1124                                         if (tag != 1) {
1125                                             if (file_printf(ms, ", unknown gnu"
1126                                                 " capability tag %d", tag)
1127                                                 == -1)
1128                                                 return -1;
1129                                             break;
1130                                         }
1131                                         // gnu attributes
1132 #endif
1133                                         break;
1134                                 }
1135                                 (void)memcpy(xcap_addr, cbuf, xcap_sizeof);
1136                                 switch (xcap_tag) {
1137                                 case CA_SUNW_NULL:
1138                                         break;
1139                                 case CA_SUNW_HW_1:
1140                                         cap_hw1 |= xcap_val;
1141                                         break;
1142                                 case CA_SUNW_SF_1:
1143                                         cap_sf1 |= xcap_val;
1144                                         break;
1145                                 default:
1146                                         if (file_printf(ms,
1147                                             ", with unknown capability "
1148                                             "0x%" INT64_T_FORMAT "x = 0x%"
1149                                             INT64_T_FORMAT "x",
1150                                             (unsigned long long)xcap_tag,
1151                                             (unsigned long long)xcap_val) == -1)
1152                                                 return -1;
1153                                         if (nbadcap++ > 2)
1154                                                 coff = xsh_size;
1155                                         break;
1156                                 }
1157                         }
1158                         /*FALLTHROUGH*/
1159                 skip:
1160                 default:
1161                         break;
1162                 }
1163         }
1164
1165         if (file_printf(ms, ", %sstripped", stripped ? "" : "not ") == -1)
1166                 return -1;
1167         if (cap_hw1) {
1168                 const cap_desc_t *cdp;
1169                 switch (mach) {
1170                 case EM_SPARC:
1171                 case EM_SPARC32PLUS:
1172                 case EM_SPARCV9:
1173                         cdp = cap_desc_sparc;
1174                         break;
1175                 case EM_386:
1176                 case EM_IA_64:
1177                 case EM_AMD64:
1178                         cdp = cap_desc_386;
1179                         break;
1180                 default:
1181                         cdp = NULL;
1182                         break;
1183                 }
1184                 if (file_printf(ms, ", uses") == -1)
1185                         return -1;
1186                 if (cdp) {
1187                         while (cdp->cd_name) {
1188                                 if (cap_hw1 & cdp->cd_mask) {
1189                                         if (file_printf(ms,
1190                                             " %s", cdp->cd_name) == -1)
1191                                                 return -1;
1192                                         cap_hw1 &= ~cdp->cd_mask;
1193                                 }
1194                                 ++cdp;
1195                         }
1196                         if (cap_hw1)
1197                                 if (file_printf(ms,
1198                                     " unknown hardware capability 0x%"
1199                                     INT64_T_FORMAT "x",
1200                                     (unsigned long long)cap_hw1) == -1)
1201                                         return -1;
1202                 } else {
1203                         if (file_printf(ms,
1204                             " hardware capability 0x%" INT64_T_FORMAT "x",
1205                             (unsigned long long)cap_hw1) == -1)
1206                                 return -1;
1207                 }
1208         }
1209         if (cap_sf1) {
1210                 if (cap_sf1 & SF1_SUNW_FPUSED) {
1211                         if (file_printf(ms,
1212                             (cap_sf1 & SF1_SUNW_FPKNWN)
1213                             ? ", uses frame pointer"
1214                             : ", not known to use frame pointer") == -1)
1215                                 return -1;
1216                 }
1217                 cap_sf1 &= ~SF1_SUNW_MASK;
1218                 if (cap_sf1)
1219                         if (file_printf(ms,
1220                             ", with unknown software capability 0x%"
1221                             INT64_T_FORMAT "x",
1222                             (unsigned long long)cap_sf1) == -1)
1223                                 return -1;
1224         }
1225         return 0;
1226 }
1227
1228 /*
1229  * Look through the program headers of an executable image, searching
1230  * for a PT_INTERP section; if one is found, it's dynamically linked,
1231  * otherwise it's statically linked.
1232  */
1233 private int
1234 dophn_exec(struct magic_set *ms, int clazz, int swap, int fd, off_t off,
1235     int num, size_t size, off_t fsize, int sh_num, int *flags,
1236     uint16_t *notecount)
1237 {
1238         Elf32_Phdr ph32;
1239         Elf64_Phdr ph64;
1240         const char *linking_style = "statically";
1241         const char *interp = "";
1242         unsigned char nbuf[BUFSIZ];
1243         char ibuf[BUFSIZ];
1244         ssize_t bufsize;
1245         size_t offset, align, len;
1246
1247         if (size != xph_sizeof) {
1248                 if (file_printf(ms, ", corrupted program header size") == -1)
1249                         return -1;
1250                 return 0;
1251         }
1252
1253         for ( ; num; num--) {
1254                 if (pread(fd, xph_addr, xph_sizeof, off) < (ssize_t)xph_sizeof) {
1255                         file_badread(ms);
1256                         return -1;
1257                 }
1258
1259                 off += size;
1260                 bufsize = 0;
1261                 align = 4;
1262
1263                 /* Things we can determine before we seek */
1264                 switch (xph_type) {
1265                 case PT_DYNAMIC:
1266                         linking_style = "dynamically";
1267                         break;
1268                 case PT_NOTE:
1269                         if (sh_num)     /* Did this through section headers */
1270                                 continue;
1271                         if (((align = xph_align) & 0x80000000UL) != 0 ||
1272                             align < 4) {
1273                                 if (file_printf(ms,
1274                                     ", invalid note alignment 0x%lx",
1275                                     (unsigned long)align) == -1)
1276                                         return -1;
1277                                 align = 4;
1278                         }
1279                         /*FALLTHROUGH*/
1280                 case PT_INTERP:
1281                         len = xph_filesz < sizeof(nbuf) ? xph_filesz
1282                             : sizeof(nbuf);
1283                         bufsize = pread(fd, nbuf, len, xph_offset);
1284                         if (bufsize == -1) {
1285                                 file_badread(ms);
1286                                 return -1;
1287                         }
1288                         break;
1289                 default:
1290                         if (fsize != SIZE_UNKNOWN && xph_offset > fsize) {
1291                                 /* Maybe warn here? */
1292                                 continue;
1293                         }
1294                         break;
1295                 }
1296
1297                 /* Things we can determine when we seek */
1298                 switch (xph_type) {
1299                 case PT_INTERP:
1300                         if (bufsize && nbuf[0]) {
1301                                 nbuf[bufsize - 1] = '\0';
1302                                 interp = (const char *)nbuf;
1303                         } else
1304                                 interp = "*empty*";
1305                         break;
1306                 case PT_NOTE:
1307                         /*
1308                          * This is a PT_NOTE section; loop through all the notes
1309                          * in the section.
1310                          */
1311                         offset = 0;
1312                         for (;;) {
1313                                 if (offset >= (size_t)bufsize)
1314                                         break;
1315                                 offset = donote(ms, nbuf, offset,
1316                                     (size_t)bufsize, clazz, swap, align,
1317                                     flags, notecount);
1318                                 if (offset == 0)
1319                                         break;
1320                         }
1321                         break;
1322                 default:
1323                         break;
1324                 }
1325         }
1326         if (file_printf(ms, ", %s linked", linking_style)
1327             == -1)
1328                 return -1;
1329         if (interp[0])
1330                 if (file_printf(ms, ", interpreter %s",
1331                     file_printable(ibuf, sizeof(ibuf), interp)) == -1)
1332                         return -1;
1333         return 0;
1334 }
1335
1336
1337 protected int
1338 file_tryelf(struct magic_set *ms, int fd, const unsigned char *buf,
1339     size_t nbytes)
1340 {
1341         union {
1342                 int32_t l;
1343                 char c[sizeof (int32_t)];
1344         } u;
1345         int clazz;
1346         int swap;
1347         struct stat st;
1348         off_t fsize;
1349         int flags = 0;
1350         Elf32_Ehdr elf32hdr;
1351         Elf64_Ehdr elf64hdr;
1352         uint16_t type, phnum, shnum, notecount;
1353
1354         if (ms->flags & (MAGIC_MIME|MAGIC_APPLE))
1355                 return 0;
1356         /*
1357          * ELF executables have multiple section headers in arbitrary
1358          * file locations and thus file(1) cannot determine it from easily.
1359          * Instead we traverse thru all section headers until a symbol table
1360          * one is found or else the binary is stripped.
1361          * Return immediately if it's not ELF (so we avoid pipe2file unless needed).
1362          */
1363         if (buf[EI_MAG0] != ELFMAG0
1364             || (buf[EI_MAG1] != ELFMAG1 && buf[EI_MAG1] != OLFMAG1)
1365             || buf[EI_MAG2] != ELFMAG2 || buf[EI_MAG3] != ELFMAG3)
1366                 return 0;
1367
1368         /*
1369          * If we cannot seek, it must be a pipe, socket or fifo.
1370          */
1371         if((lseek(fd, (off_t)0, SEEK_SET) == (off_t)-1) && (errno == ESPIPE))
1372                 fd = file_pipe2file(ms, fd, buf, nbytes);
1373
1374         if (fstat(fd, &st) == -1) {
1375                 file_badread(ms);
1376                 return -1;
1377         }
1378         if (S_ISREG(st.st_mode) || st.st_size != 0)
1379                 fsize = st.st_size;
1380         else
1381                 fsize = SIZE_UNKNOWN;
1382
1383         clazz = buf[EI_CLASS];
1384
1385         switch (clazz) {
1386         case ELFCLASS32:
1387 #undef elf_getu
1388 #define elf_getu(a, b)  elf_getu32(a, b)
1389 #undef elfhdr
1390 #define elfhdr elf32hdr
1391 #include "elfclass.h"
1392         case ELFCLASS64:
1393 #undef elf_getu
1394 #define elf_getu(a, b)  elf_getu64(a, b)
1395 #undef elfhdr
1396 #define elfhdr elf64hdr
1397 #include "elfclass.h"
1398         default:
1399             if (file_printf(ms, ", unknown class %d", clazz) == -1)
1400                     return -1;
1401             break;
1402         }
1403         return 0;
1404 }
1405 #endif