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sbin/hammer: Have consistent naming for buffer variables
[dragonfly.git] / contrib / file / src / readelf.c
blobd159620cec858e33c66c3b6fda5ea731621ca440
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
DragonFly BSD