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 1.122 2015/09/10 13:59:32 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
toomany(struct magic_set * ms,const char * name,uint16_t num)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
getu16(int swap,uint16_t value)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
getu32(int swap,uint32_t value)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
getu64(int swap,uint64_t value)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
dophn_core(struct magic_set * ms,int clazz,int swap,int fd,off_t off,int num,size_t size,off_t fsize,int * flags,uint16_t * notecount)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
do_note_netbsd_version(struct magic_set * ms,int swap,void * v)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
do_note_freebsd_version(struct magic_set * ms,int swap,void * v)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 /*ARGSUSED*/
do_bid_note(struct magic_set * ms,unsigned char * nbuf,uint32_t type,int swap,uint32_t namesz,uint32_t descsz,size_t noff,size_t doff,int * flags)486 do_bid_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type,
487 int swap __attribute__((__unused__)), uint32_t namesz, uint32_t descsz,
488 size_t noff, size_t doff, int *flags)
489 {
490 if (namesz == 4 && strcmp((char *)&nbuf[noff], "GNU") == 0 &&
491 type == NT_GNU_BUILD_ID && (descsz == 16 || descsz == 20)) {
492 uint8_t desc[20];
493 uint32_t i;
494 *flags |= FLAGS_DID_BUILD_ID;
495 if (file_printf(ms, ", BuildID[%s]=", descsz == 16 ? "md5/uuid" :
496 "sha1") == -1)
497 return 1;
498 (void)memcpy(desc, &nbuf[doff], descsz);
499 for (i = 0; i < descsz; i++)
500 if (file_printf(ms, "%02x", desc[i]) == -1)
501 return 1;
502 return 1;
503 }
504 return 0;
505 }
506
507 private int
do_os_note(struct magic_set * ms,unsigned char * nbuf,uint32_t type,int swap,uint32_t namesz,uint32_t descsz,size_t noff,size_t doff,int * flags)508 do_os_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type,
509 int swap, uint32_t namesz, uint32_t descsz,
510 size_t noff, size_t doff, int *flags)
511 {
512 if (namesz == 5 && strcmp((char *)&nbuf[noff], "SuSE") == 0 &&
513 type == NT_GNU_VERSION && descsz == 2) {
514 *flags |= FLAGS_DID_OS_NOTE;
515 file_printf(ms, ", for SuSE %d.%d", nbuf[doff], nbuf[doff + 1]);
516 return 1;
517 }
518
519 if (namesz == 4 && strcmp((char *)&nbuf[noff], "GNU") == 0 &&
520 type == NT_GNU_VERSION && descsz == 16) {
521 uint32_t desc[4];
522 (void)memcpy(desc, &nbuf[doff], sizeof(desc));
523
524 *flags |= FLAGS_DID_OS_NOTE;
525 if (file_printf(ms, ", for GNU/") == -1)
526 return 1;
527 switch (elf_getu32(swap, desc[0])) {
528 case GNU_OS_LINUX:
529 if (file_printf(ms, "Linux") == -1)
530 return 1;
531 break;
532 case GNU_OS_HURD:
533 if (file_printf(ms, "Hurd") == -1)
534 return 1;
535 break;
536 case GNU_OS_SOLARIS:
537 if (file_printf(ms, "Solaris") == -1)
538 return 1;
539 break;
540 case GNU_OS_KFREEBSD:
541 if (file_printf(ms, "kFreeBSD") == -1)
542 return 1;
543 break;
544 case GNU_OS_KNETBSD:
545 if (file_printf(ms, "kNetBSD") == -1)
546 return 1;
547 break;
548 default:
549 if (file_printf(ms, "<unknown>") == -1)
550 return 1;
551 }
552 if (file_printf(ms, " %d.%d.%d", elf_getu32(swap, desc[1]),
553 elf_getu32(swap, desc[2]), elf_getu32(swap, desc[3])) == -1)
554 return 1;
555 return 1;
556 }
557
558 if (namesz == 7 && strcmp((char *)&nbuf[noff], "NetBSD") == 0) {
559 if (type == NT_NETBSD_VERSION && descsz == 4) {
560 *flags |= FLAGS_DID_OS_NOTE;
561 do_note_netbsd_version(ms, swap, &nbuf[doff]);
562 return 1;
563 }
564 }
565
566 if (namesz == 8 && strcmp((char *)&nbuf[noff], "FreeBSD") == 0) {
567 if (type == NT_FREEBSD_VERSION && descsz == 4) {
568 *flags |= FLAGS_DID_OS_NOTE;
569 do_note_freebsd_version(ms, swap, &nbuf[doff]);
570 return 1;
571 }
572 }
573
574 if (namesz == 8 && strcmp((char *)&nbuf[noff], "OpenBSD") == 0 &&
575 type == NT_OPENBSD_VERSION && descsz == 4) {
576 *flags |= FLAGS_DID_OS_NOTE;
577 if (file_printf(ms, ", for OpenBSD") == -1)
578 return 1;
579 /* Content of note is always 0 */
580 return 1;
581 }
582
583 if (namesz == 10 && strcmp((char *)&nbuf[noff], "DragonFly") == 0 &&
584 type == NT_DRAGONFLY_VERSION && descsz == 4) {
585 uint32_t desc;
586 *flags |= FLAGS_DID_OS_NOTE;
587 if (file_printf(ms, ", for DragonFly") == -1)
588 return 1;
589 (void)memcpy(&desc, &nbuf[doff], sizeof(desc));
590 desc = elf_getu32(swap, desc);
591 if (file_printf(ms, " %d.%d.%d", desc / 100000,
592 desc / 10000 % 10, desc % 10000) == -1)
593 return 1;
594 return 1;
595 }
596 return 0;
597 }
598
599 private int
do_pax_note(struct magic_set * ms,unsigned char * nbuf,uint32_t type,int swap,uint32_t namesz,uint32_t descsz,size_t noff,size_t doff,int * flags)600 do_pax_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type,
601 int swap, uint32_t namesz, uint32_t descsz,
602 size_t noff, size_t doff, int *flags)
603 {
604 if (namesz == 4 && strcmp((char *)&nbuf[noff], "PaX") == 0 &&
605 type == NT_NETBSD_PAX && descsz == 4) {
606 static const char *pax[] = {
607 "+mprotect",
608 "-mprotect",
609 "+segvguard",
610 "-segvguard",
611 "+ASLR",
612 "-ASLR",
613 };
614 uint32_t desc;
615 size_t i;
616 int did = 0;
617
618 *flags |= FLAGS_DID_NETBSD_PAX;
619 (void)memcpy(&desc, &nbuf[doff], sizeof(desc));
620 desc = elf_getu32(swap, desc);
621
622 if (desc && file_printf(ms, ", PaX: ") == -1)
623 return 1;
624
625 for (i = 0; i < __arraycount(pax); i++) {
626 if (((1 << (int)i) & desc) == 0)
627 continue;
628 if (file_printf(ms, "%s%s", did++ ? "," : "",
629 pax[i]) == -1)
630 return 1;
631 }
632 return 1;
633 }
634 return 0;
635 }
636
637 private int
do_core_note(struct magic_set * ms,unsigned char * nbuf,uint32_t type,int swap,uint32_t namesz,uint32_t descsz,size_t noff,size_t doff,int * flags,size_t size,int clazz)638 do_core_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type,
639 int swap, uint32_t namesz, uint32_t descsz,
640 size_t noff, size_t doff, int *flags, size_t size, int clazz)
641 {
642 #ifdef ELFCORE
643 int os_style = -1;
644 /*
645 * Sigh. The 2.0.36 kernel in Debian 2.1, at
646 * least, doesn't correctly implement name
647 * sections, in core dumps, as specified by
648 * the "Program Linking" section of "UNIX(R) System
649 * V Release 4 Programmer's Guide: ANSI C and
650 * Programming Support Tools", because my copy
651 * clearly says "The first 'namesz' bytes in 'name'
652 * contain a *null-terminated* [emphasis mine]
653 * character representation of the entry's owner
654 * or originator", but the 2.0.36 kernel code
655 * doesn't include the terminating null in the
656 * name....
657 */
658 if ((namesz == 4 && strncmp((char *)&nbuf[noff], "CORE", 4) == 0) ||
659 (namesz == 5 && strcmp((char *)&nbuf[noff], "CORE") == 0)) {
660 os_style = OS_STYLE_SVR4;
661 }
662
663 if ((namesz == 8 && strcmp((char *)&nbuf[noff], "FreeBSD") == 0)) {
664 os_style = OS_STYLE_FREEBSD;
665 }
666
667 if ((namesz >= 11 && strncmp((char *)&nbuf[noff], "NetBSD-CORE", 11)
668 == 0)) {
669 os_style = OS_STYLE_NETBSD;
670 }
671
672 if (os_style != -1 && (*flags & FLAGS_DID_CORE_STYLE) == 0) {
673 if (file_printf(ms, ", %s-style", os_style_names[os_style])
674 == -1)
675 return 1;
676 *flags |= FLAGS_DID_CORE_STYLE;
677 }
678
679 switch (os_style) {
680 case OS_STYLE_NETBSD:
681 if (type == NT_NETBSD_CORE_PROCINFO) {
682 char sbuf[512];
683 uint32_t signo;
684 /*
685 * Extract the program name. It is at
686 * offset 0x7c, and is up to 32-bytes,
687 * including the terminating NUL.
688 */
689 if (file_printf(ms, ", from '%.31s'",
690 file_printable(sbuf, sizeof(sbuf),
691 (const char *)&nbuf[doff + 0x7c])) == -1)
692 return 1;
693
694 /*
695 * Extract the signal number. It is at
696 * offset 0x08.
697 */
698 (void)memcpy(&signo, &nbuf[doff + 0x08],
699 sizeof(signo));
700 if (file_printf(ms, " (signal %u)",
701 elf_getu32(swap, signo)) == -1)
702 return 1;
703 *flags |= FLAGS_DID_CORE;
704 return 1;
705 }
706 break;
707
708 default:
709 if (type == NT_PRPSINFO && *flags & FLAGS_IS_CORE) {
710 size_t i, j;
711 unsigned char c;
712 /*
713 * Extract the program name. We assume
714 * it to be 16 characters (that's what it
715 * is in SunOS 5.x and Linux).
716 *
717 * Unfortunately, it's at a different offset
718 * in various OSes, so try multiple offsets.
719 * If the characters aren't all printable,
720 * reject it.
721 */
722 for (i = 0; i < NOFFSETS; i++) {
723 unsigned char *cname, *cp;
724 size_t reloffset = prpsoffsets(i);
725 size_t noffset = doff + reloffset;
726 size_t k;
727 for (j = 0; j < 16; j++, noffset++,
728 reloffset++) {
729 /*
730 * Make sure we're not past
731 * the end of the buffer; if
732 * we are, just give up.
733 */
734 if (noffset >= size)
735 goto tryanother;
736
737 /*
738 * Make sure we're not past
739 * the end of the contents;
740 * if we are, this obviously
741 * isn't the right offset.
742 */
743 if (reloffset >= descsz)
744 goto tryanother;
745
746 c = nbuf[noffset];
747 if (c == '\0') {
748 /*
749 * A '\0' at the
750 * beginning is
751 * obviously wrong.
752 * Any other '\0'
753 * means we're done.
754 */
755 if (j == 0)
756 goto tryanother;
757 else
758 break;
759 } else {
760 /*
761 * A nonprintable
762 * character is also
763 * wrong.
764 */
765 if (!isprint(c) || isquote(c))
766 goto tryanother;
767 }
768 }
769 /*
770 * Well, that worked.
771 */
772
773 /*
774 * Try next offsets, in case this match is
775 * in the middle of a string.
776 */
777 for (k = i + 1 ; k < NOFFSETS; k++) {
778 size_t no;
779 int adjust = 1;
780 if (prpsoffsets(k) >= prpsoffsets(i))
781 continue;
782 for (no = doff + prpsoffsets(k);
783 no < doff + prpsoffsets(i); no++)
784 adjust = adjust
785 && isprint(nbuf[no]);
786 if (adjust)
787 i = k;
788 }
789
790 cname = (unsigned char *)
791 &nbuf[doff + prpsoffsets(i)];
792 for (cp = cname; *cp && isprint(*cp); cp++)
793 continue;
794 /*
795 * Linux apparently appends a space at the end
796 * of the command line: remove it.
797 */
798 while (cp > cname && isspace(cp[-1]))
799 cp--;
800 if (file_printf(ms, ", from '%.*s'",
801 (int)(cp - cname), cname) == -1)
802 return 1;
803 *flags |= FLAGS_DID_CORE;
804 return 1;
805
806 tryanother:
807 ;
808 }
809 }
810 break;
811 }
812 #endif
813 return 0;
814 }
815
816 private size_t
donote(struct magic_set * ms,void * vbuf,size_t offset,size_t size,int clazz,int swap,size_t align,int * flags,uint16_t * notecount)817 donote(struct magic_set *ms, void *vbuf, size_t offset, size_t size,
818 int clazz, int swap, size_t align, int *flags, uint16_t *notecount)
819 {
820 Elf32_Nhdr nh32;
821 Elf64_Nhdr nh64;
822 size_t noff, doff;
823 uint32_t namesz, descsz;
824 unsigned char *nbuf = CAST(unsigned char *, vbuf);
825
826 if (*notecount == 0)
827 return 0;
828 --*notecount;
829
830 if (xnh_sizeof + offset > size) {
831 /*
832 * We're out of note headers.
833 */
834 return xnh_sizeof + offset;
835 }
836
837 (void)memcpy(xnh_addr, &nbuf[offset], xnh_sizeof);
838 offset += xnh_sizeof;
839
840 namesz = xnh_namesz;
841 descsz = xnh_descsz;
842 if ((namesz == 0) && (descsz == 0)) {
843 /*
844 * We're out of note headers.
845 */
846 return (offset >= size) ? offset : size;
847 }
848
849 if (namesz & 0x80000000) {
850 (void)file_printf(ms, ", bad note name size 0x%lx",
851 (unsigned long)namesz);
852 return 0;
853 }
854
855 if (descsz & 0x80000000) {
856 (void)file_printf(ms, ", bad note description size 0x%lx",
857 (unsigned long)descsz);
858 return 0;
859 }
860
861 noff = offset;
862 doff = ELF_ALIGN(offset + namesz);
863
864 if (offset + namesz > size) {
865 /*
866 * We're past the end of the buffer.
867 */
868 return doff;
869 }
870
871 offset = ELF_ALIGN(doff + descsz);
872 if (doff + descsz > size) {
873 /*
874 * We're past the end of the buffer.
875 */
876 return (offset >= size) ? offset : size;
877 }
878
879 if ((*flags & FLAGS_DID_OS_NOTE) == 0) {
880 if (do_os_note(ms, nbuf, xnh_type, swap,
881 namesz, descsz, noff, doff, flags))
882 return size;
883 }
884
885 if ((*flags & FLAGS_DID_BUILD_ID) == 0) {
886 if (do_bid_note(ms, nbuf, xnh_type, swap,
887 namesz, descsz, noff, doff, flags))
888 return size;
889 }
890
891 if ((*flags & FLAGS_DID_NETBSD_PAX) == 0) {
892 if (do_pax_note(ms, nbuf, xnh_type, swap,
893 namesz, descsz, noff, doff, flags))
894 return size;
895 }
896
897 if ((*flags & FLAGS_DID_CORE) == 0) {
898 if (do_core_note(ms, nbuf, xnh_type, swap,
899 namesz, descsz, noff, doff, flags, size, clazz))
900 return size;
901 }
902
903 if (namesz == 7 && strcmp((char *)&nbuf[noff], "NetBSD") == 0) {
904 if (descsz > 100)
905 descsz = 100;
906 switch (xnh_type) {
907 case NT_NETBSD_VERSION:
908 return size;
909 case NT_NETBSD_MARCH:
910 if (*flags & FLAGS_DID_NETBSD_MARCH)
911 return size;
912 *flags |= FLAGS_DID_NETBSD_MARCH;
913 if (file_printf(ms, ", compiled for: %.*s",
914 (int)descsz, (const char *)&nbuf[doff]) == -1)
915 return size;
916 break;
917 case NT_NETBSD_CMODEL:
918 if (*flags & FLAGS_DID_NETBSD_CMODEL)
919 return size;
920 *flags |= FLAGS_DID_NETBSD_CMODEL;
921 if (file_printf(ms, ", compiler model: %.*s",
922 (int)descsz, (const char *)&nbuf[doff]) == -1)
923 return size;
924 break;
925 default:
926 if (*flags & FLAGS_DID_NETBSD_UNKNOWN)
927 return size;
928 *flags |= FLAGS_DID_NETBSD_UNKNOWN;
929 if (file_printf(ms, ", note=%u", xnh_type) == -1)
930 return size;
931 break;
932 }
933 return size;
934 }
935
936 return offset;
937 }
938
939 /* SunOS 5.x hardware capability descriptions */
940 typedef struct cap_desc {
941 uint64_t cd_mask;
942 const char *cd_name;
943 } cap_desc_t;
944
945 static const cap_desc_t cap_desc_sparc[] = {
946 { AV_SPARC_MUL32, "MUL32" },
947 { AV_SPARC_DIV32, "DIV32" },
948 { AV_SPARC_FSMULD, "FSMULD" },
949 { AV_SPARC_V8PLUS, "V8PLUS" },
950 { AV_SPARC_POPC, "POPC" },
951 { AV_SPARC_VIS, "VIS" },
952 { AV_SPARC_VIS2, "VIS2" },
953 { AV_SPARC_ASI_BLK_INIT, "ASI_BLK_INIT" },
954 { AV_SPARC_FMAF, "FMAF" },
955 { AV_SPARC_FJFMAU, "FJFMAU" },
956 { AV_SPARC_IMA, "IMA" },
957 { 0, NULL }
958 };
959
960 static const cap_desc_t cap_desc_386[] = {
961 { AV_386_FPU, "FPU" },
962 { AV_386_TSC, "TSC" },
963 { AV_386_CX8, "CX8" },
964 { AV_386_SEP, "SEP" },
965 { AV_386_AMD_SYSC, "AMD_SYSC" },
966 { AV_386_CMOV, "CMOV" },
967 { AV_386_MMX, "MMX" },
968 { AV_386_AMD_MMX, "AMD_MMX" },
969 { AV_386_AMD_3DNow, "AMD_3DNow" },
970 { AV_386_AMD_3DNowx, "AMD_3DNowx" },
971 { AV_386_FXSR, "FXSR" },
972 { AV_386_SSE, "SSE" },
973 { AV_386_SSE2, "SSE2" },
974 { AV_386_PAUSE, "PAUSE" },
975 { AV_386_SSE3, "SSE3" },
976 { AV_386_MON, "MON" },
977 { AV_386_CX16, "CX16" },
978 { AV_386_AHF, "AHF" },
979 { AV_386_TSCP, "TSCP" },
980 { AV_386_AMD_SSE4A, "AMD_SSE4A" },
981 { AV_386_POPCNT, "POPCNT" },
982 { AV_386_AMD_LZCNT, "AMD_LZCNT" },
983 { AV_386_SSSE3, "SSSE3" },
984 { AV_386_SSE4_1, "SSE4.1" },
985 { AV_386_SSE4_2, "SSE4.2" },
986 { 0, NULL }
987 };
988
989 private int
doshn(struct magic_set * ms,int clazz,int swap,int fd,off_t off,int num,size_t size,off_t fsize,int mach,int strtab,int * flags,uint16_t * notecount)990 doshn(struct magic_set *ms, int clazz, int swap, int fd, off_t off, int num,
991 size_t size, off_t fsize, int mach, int strtab, int *flags,
992 uint16_t *notecount)
993 {
994 Elf32_Shdr sh32;
995 Elf64_Shdr sh64;
996 int stripped = 1;
997 size_t nbadcap = 0;
998 void *nbuf;
999 off_t noff, coff, name_off;
1000 uint64_t cap_hw1 = 0; /* SunOS 5.x hardware capabilites */
1001 uint64_t cap_sf1 = 0; /* SunOS 5.x software capabilites */
1002 char name[50];
1003 ssize_t namesize;
1004
1005 if (size != xsh_sizeof) {
1006 if (file_printf(ms, ", corrupted section header size") == -1)
1007 return -1;
1008 return 0;
1009 }
1010
1011 /* Read offset of name section to be able to read section names later */
1012 if (pread(fd, xsh_addr, xsh_sizeof, CAST(off_t, (off + size * strtab)))
1013 < (ssize_t)xsh_sizeof) {
1014 file_badread(ms);
1015 return -1;
1016 }
1017 name_off = xsh_offset;
1018
1019 for ( ; num; num--) {
1020 /* Read the name of this section. */
1021 if ((namesize = pread(fd, name, sizeof(name) - 1, name_off + xsh_name)) == -1) {
1022 file_badread(ms);
1023 return -1;
1024 }
1025 name[namesize] = '\0';
1026 if (strcmp(name, ".debug_info") == 0)
1027 stripped = 0;
1028
1029 if (pread(fd, xsh_addr, xsh_sizeof, off) < (ssize_t)xsh_sizeof) {
1030 file_badread(ms);
1031 return -1;
1032 }
1033 off += size;
1034
1035 /* Things we can determine before we seek */
1036 switch (xsh_type) {
1037 case SHT_SYMTAB:
1038 #if 0
1039 case SHT_DYNSYM:
1040 #endif
1041 stripped = 0;
1042 break;
1043 default:
1044 if (fsize != SIZE_UNKNOWN && xsh_offset > fsize) {
1045 /* Perhaps warn here */
1046 continue;
1047 }
1048 break;
1049 }
1050
1051
1052 /* Things we can determine when we seek */
1053 switch (xsh_type) {
1054 case SHT_NOTE:
1055 if ((uintmax_t)(xsh_size + xsh_offset) >
1056 (uintmax_t)fsize) {
1057 if (file_printf(ms,
1058 ", note offset/size 0x%" INTMAX_T_FORMAT
1059 "x+0x%" INTMAX_T_FORMAT "x exceeds"
1060 " file size 0x%" INTMAX_T_FORMAT "x",
1061 (uintmax_t)xsh_offset, (uintmax_t)xsh_size,
1062 (uintmax_t)fsize) == -1)
1063 return -1;
1064 return 0;
1065 }
1066 if ((nbuf = malloc(xsh_size)) == NULL) {
1067 file_error(ms, errno, "Cannot allocate memory"
1068 " for note");
1069 return -1;
1070 }
1071 if (pread(fd, nbuf, xsh_size, xsh_offset) <
1072 (ssize_t)xsh_size) {
1073 file_badread(ms);
1074 free(nbuf);
1075 return -1;
1076 }
1077
1078 noff = 0;
1079 for (;;) {
1080 if (noff >= (off_t)xsh_size)
1081 break;
1082 noff = donote(ms, nbuf, (size_t)noff,
1083 xsh_size, clazz, swap, 4, flags, notecount);
1084 if (noff == 0)
1085 break;
1086 }
1087 free(nbuf);
1088 break;
1089 case SHT_SUNW_cap:
1090 switch (mach) {
1091 case EM_SPARC:
1092 case EM_SPARCV9:
1093 case EM_IA_64:
1094 case EM_386:
1095 case EM_AMD64:
1096 break;
1097 default:
1098 goto skip;
1099 }
1100
1101 if (nbadcap > 5)
1102 break;
1103 if (lseek(fd, xsh_offset, SEEK_SET) == (off_t)-1) {
1104 file_badseek(ms);
1105 return -1;
1106 }
1107 coff = 0;
1108 for (;;) {
1109 Elf32_Cap cap32;
1110 Elf64_Cap cap64;
1111 char cbuf[/*CONSTCOND*/
1112 MAX(sizeof cap32, sizeof cap64)];
1113 if ((coff += xcap_sizeof) > (off_t)xsh_size)
1114 break;
1115 if (read(fd, cbuf, (size_t)xcap_sizeof) !=
1116 (ssize_t)xcap_sizeof) {
1117 file_badread(ms);
1118 return -1;
1119 }
1120 if (cbuf[0] == 'A') {
1121 #ifdef notyet
1122 char *p = cbuf + 1;
1123 uint32_t len, tag;
1124 memcpy(&len, p, sizeof(len));
1125 p += 4;
1126 len = getu32(swap, len);
1127 if (memcmp("gnu", p, 3) != 0) {
1128 if (file_printf(ms,
1129 ", unknown capability %.3s", p)
1130 == -1)
1131 return -1;
1132 break;
1133 }
1134 p += strlen(p) + 1;
1135 tag = *p++;
1136 memcpy(&len, p, sizeof(len));
1137 p += 4;
1138 len = getu32(swap, len);
1139 if (tag != 1) {
1140 if (file_printf(ms, ", unknown gnu"
1141 " capability tag %d", tag)
1142 == -1)
1143 return -1;
1144 break;
1145 }
1146 // gnu attributes
1147 #endif
1148 break;
1149 }
1150 (void)memcpy(xcap_addr, cbuf, xcap_sizeof);
1151 switch (xcap_tag) {
1152 case CA_SUNW_NULL:
1153 break;
1154 case CA_SUNW_HW_1:
1155 cap_hw1 |= xcap_val;
1156 break;
1157 case CA_SUNW_SF_1:
1158 cap_sf1 |= xcap_val;
1159 break;
1160 default:
1161 if (file_printf(ms,
1162 ", with unknown capability "
1163 "0x%" INT64_T_FORMAT "x = 0x%"
1164 INT64_T_FORMAT "x",
1165 (unsigned long long)xcap_tag,
1166 (unsigned long long)xcap_val) == -1)
1167 return -1;
1168 if (nbadcap++ > 2)
1169 coff = xsh_size;
1170 break;
1171 }
1172 }
1173 /*FALLTHROUGH*/
1174 skip:
1175 default:
1176 break;
1177 }
1178 }
1179
1180 if (file_printf(ms, ", %sstripped", stripped ? "" : "not ") == -1)
1181 return -1;
1182 if (cap_hw1) {
1183 const cap_desc_t *cdp;
1184 switch (mach) {
1185 case EM_SPARC:
1186 case EM_SPARC32PLUS:
1187 case EM_SPARCV9:
1188 cdp = cap_desc_sparc;
1189 break;
1190 case EM_386:
1191 case EM_IA_64:
1192 case EM_AMD64:
1193 cdp = cap_desc_386;
1194 break;
1195 default:
1196 cdp = NULL;
1197 break;
1198 }
1199 if (file_printf(ms, ", uses") == -1)
1200 return -1;
1201 if (cdp) {
1202 while (cdp->cd_name) {
1203 if (cap_hw1 & cdp->cd_mask) {
1204 if (file_printf(ms,
1205 " %s", cdp->cd_name) == -1)
1206 return -1;
1207 cap_hw1 &= ~cdp->cd_mask;
1208 }
1209 ++cdp;
1210 }
1211 if (cap_hw1)
1212 if (file_printf(ms,
1213 " unknown hardware capability 0x%"
1214 INT64_T_FORMAT "x",
1215 (unsigned long long)cap_hw1) == -1)
1216 return -1;
1217 } else {
1218 if (file_printf(ms,
1219 " hardware capability 0x%" INT64_T_FORMAT "x",
1220 (unsigned long long)cap_hw1) == -1)
1221 return -1;
1222 }
1223 }
1224 if (cap_sf1) {
1225 if (cap_sf1 & SF1_SUNW_FPUSED) {
1226 if (file_printf(ms,
1227 (cap_sf1 & SF1_SUNW_FPKNWN)
1228 ? ", uses frame pointer"
1229 : ", not known to use frame pointer") == -1)
1230 return -1;
1231 }
1232 cap_sf1 &= ~SF1_SUNW_MASK;
1233 if (cap_sf1)
1234 if (file_printf(ms,
1235 ", with unknown software capability 0x%"
1236 INT64_T_FORMAT "x",
1237 (unsigned long long)cap_sf1) == -1)
1238 return -1;
1239 }
1240 return 0;
1241 }
1242
1243 /*
1244 * Look through the program headers of an executable image, searching
1245 * for a PT_INTERP section; if one is found, it's dynamically linked,
1246 * otherwise it's statically linked.
1247 */
1248 private int
dophn_exec(struct magic_set * ms,int clazz,int swap,int fd,off_t off,int num,size_t size,off_t fsize,int sh_num,int * flags,uint16_t * notecount)1249 dophn_exec(struct magic_set *ms, int clazz, int swap, int fd, off_t off,
1250 int num, size_t size, off_t fsize, int sh_num, int *flags,
1251 uint16_t *notecount)
1252 {
1253 Elf32_Phdr ph32;
1254 Elf64_Phdr ph64;
1255 const char *linking_style = "statically";
1256 const char *interp = "";
1257 unsigned char nbuf[BUFSIZ];
1258 char ibuf[BUFSIZ];
1259 ssize_t bufsize;
1260 size_t offset, align, len;
1261
1262 if (size != xph_sizeof) {
1263 if (file_printf(ms, ", corrupted program header size") == -1)
1264 return -1;
1265 return 0;
1266 }
1267
1268 for ( ; num; num--) {
1269 if (pread(fd, xph_addr, xph_sizeof, off) < (ssize_t)xph_sizeof) {
1270 file_badread(ms);
1271 return -1;
1272 }
1273
1274 off += size;
1275 bufsize = 0;
1276 align = 4;
1277
1278 /* Things we can determine before we seek */
1279 switch (xph_type) {
1280 case PT_DYNAMIC:
1281 linking_style = "dynamically";
1282 break;
1283 case PT_NOTE:
1284 if (sh_num) /* Did this through section headers */
1285 continue;
1286 if (((align = xph_align) & 0x80000000UL) != 0 ||
1287 align < 4) {
1288 if (file_printf(ms,
1289 ", invalid note alignment 0x%lx",
1290 (unsigned long)align) == -1)
1291 return -1;
1292 align = 4;
1293 }
1294 /*FALLTHROUGH*/
1295 case PT_INTERP:
1296 len = xph_filesz < sizeof(nbuf) ? xph_filesz
1297 : sizeof(nbuf);
1298 bufsize = pread(fd, nbuf, len, xph_offset);
1299 if (bufsize == -1) {
1300 file_badread(ms);
1301 return -1;
1302 }
1303 break;
1304 default:
1305 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) {
1306 /* Maybe warn here? */
1307 continue;
1308 }
1309 break;
1310 }
1311
1312 /* Things we can determine when we seek */
1313 switch (xph_type) {
1314 case PT_INTERP:
1315 if (bufsize && nbuf[0]) {
1316 nbuf[bufsize - 1] = '\0';
1317 interp = (const char *)nbuf;
1318 } else
1319 interp = "*empty*";
1320 break;
1321 case PT_NOTE:
1322 /*
1323 * This is a PT_NOTE section; loop through all the notes
1324 * in the section.
1325 */
1326 offset = 0;
1327 for (;;) {
1328 if (offset >= (size_t)bufsize)
1329 break;
1330 offset = donote(ms, nbuf, offset,
1331 (size_t)bufsize, clazz, swap, align,
1332 flags, notecount);
1333 if (offset == 0)
1334 break;
1335 }
1336 break;
1337 default:
1338 break;
1339 }
1340 }
1341 if (file_printf(ms, ", %s linked", linking_style)
1342 == -1)
1343 return -1;
1344 if (interp[0])
1345 if (file_printf(ms, ", interpreter %s",
1346 file_printable(ibuf, sizeof(ibuf), interp)) == -1)
1347 return -1;
1348 return 0;
1349 }
1350
1351
1352 protected int
file_tryelf(struct magic_set * ms,int fd,const unsigned char * buf,size_t nbytes)1353 file_tryelf(struct magic_set *ms, int fd, const unsigned char *buf,
1354 size_t nbytes)
1355 {
1356 union {
1357 int32_t l;
1358 char c[sizeof (int32_t)];
1359 } u;
1360 int clazz;
1361 int swap;
1362 struct stat st;
1363 off_t fsize;
1364 int flags = 0;
1365 Elf32_Ehdr elf32hdr;
1366 Elf64_Ehdr elf64hdr;
1367 uint16_t type, phnum, shnum, notecount;
1368
1369 if (ms->flags & (MAGIC_MIME|MAGIC_APPLE|MAGIC_EXTENSION))
1370 return 0;
1371 /*
1372 * ELF executables have multiple section headers in arbitrary
1373 * file locations and thus file(1) cannot determine it from easily.
1374 * Instead we traverse thru all section headers until a symbol table
1375 * one is found or else the binary is stripped.
1376 * Return immediately if it's not ELF (so we avoid pipe2file unless needed).
1377 */
1378 if (buf[EI_MAG0] != ELFMAG0
1379 || (buf[EI_MAG1] != ELFMAG1 && buf[EI_MAG1] != OLFMAG1)
1380 || buf[EI_MAG2] != ELFMAG2 || buf[EI_MAG3] != ELFMAG3)
1381 return 0;
1382
1383 /*
1384 * If we cannot seek, it must be a pipe, socket or fifo.
1385 */
1386 if((lseek(fd, (off_t)0, SEEK_SET) == (off_t)-1) && (errno == ESPIPE))
1387 fd = file_pipe2file(ms, fd, buf, nbytes);
1388
1389 if (fstat(fd, &st) == -1) {
1390 file_badread(ms);
1391 return -1;
1392 }
1393 if (S_ISREG(st.st_mode) || st.st_size != 0)
1394 fsize = st.st_size;
1395 else
1396 fsize = SIZE_UNKNOWN;
1397
1398 clazz = buf[EI_CLASS];
1399
1400 switch (clazz) {
1401 case ELFCLASS32:
1402 #undef elf_getu
1403 #define elf_getu(a, b) elf_getu32(a, b)
1404 #undef elfhdr
1405 #define elfhdr elf32hdr
1406 #include "elfclass.h"
1407 case ELFCLASS64:
1408 #undef elf_getu
1409 #define elf_getu(a, b) elf_getu64(a, b)
1410 #undef elfhdr
1411 #define elfhdr elf64hdr
1412 #include "elfclass.h"
1413 default:
1414 if (file_printf(ms, ", unknown class %d", clazz) == -1)
1415 return -1;
1416 break;
1417 }
1418 return 0;
1419 }
1420 #endif
1421