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vendor/file: upgrade from 5.32 to 5.38
[dragonfly.git] / contrib / file / src / readelf.c
blob40bcfab11dca9cc62a7b7017aa58eb939d533349
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 1.168 2019/12/16 03:49:19 christos Exp $")
31 #endif
32
33 #ifdef BUILTIN_ELF
34 #include <string.h>
35 #include <ctype.h>
36 #include <stdlib.h>
37 #ifdef HAVE_UNISTD_H
38 #include <unistd.h>
39 #endif
40
41 #include "readelf.h"
42 #include "magic.h"
43
44 #ifdef ELFCORE
45 private int dophn_core(struct magic_set *, int, int, int, off_t, int, size_t,
46 off_t, int *, uint16_t *);
47 #endif
48 private int dophn_exec(struct magic_set *, int, int, int, off_t, int, size_t,
49 off_t, int, int *, uint16_t *);
50 private int doshn(struct magic_set *, int, int, int, off_t, int, size_t,
51 off_t, int, int, int *, uint16_t *);
52 private size_t donote(struct magic_set *, void *, size_t, size_t, int,
53 int, size_t, int *, uint16_t *, int, off_t, int, off_t);
54
55 #define ELF_ALIGN(a) ((((a) + align - 1) / align) * align)
56
57 #define isquote(c) (strchr("'\"`", (c)) != NULL)
58
59 private uint16_t getu16(int, uint16_t);
60 private uint32_t getu32(int, uint32_t);
61 private uint64_t getu64(int, uint64_t);
62
63 #define MAX_PHNUM 128
64 #define MAX_SHNUM 32768
65 #define SIZE_UNKNOWN CAST(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) == -1)
71 return -1;
72 return 1;
73 }
74
75 private uint16_t
76 getu16(int swap, uint16_t value)
77 {
78 union {
79 uint16_t ui;
80 char c[2];
81 } retval, tmpval;
82
83 if (swap) {
84 tmpval.ui = value;
85
86 retval.c[0] = tmpval.c[1];
87 retval.c[1] = tmpval.c[0];
88
89 return retval.ui;
90 } else
91 return value;
92 }
93
94 private uint32_t
95 getu32(int swap, uint32_t value)
96 {
97 union {
98 uint32_t ui;
99 char c[4];
100 } retval, tmpval;
101
102 if (swap) {
103 tmpval.ui = value;
104
105 retval.c[0] = tmpval.c[3];
106 retval.c[1] = tmpval.c[2];
107 retval.c[2] = tmpval.c[1];
108 retval.c[3] = tmpval.c[0];
109
110 return retval.ui;
111 } else
112 return value;
113 }
114
115 private uint64_t
116 getu64(int swap, uint64_t value)
117 {
118 union {
119 uint64_t ui;
120 char c[8];
121 } retval, tmpval;
122
123 if (swap) {
124 tmpval.ui = value;
125
126 retval.c[0] = tmpval.c[7];
127 retval.c[1] = tmpval.c[6];
128 retval.c[2] = tmpval.c[5];
129 retval.c[3] = tmpval.c[4];
130 retval.c[4] = tmpval.c[3];
131 retval.c[5] = tmpval.c[2];
132 retval.c[6] = tmpval.c[1];
133 retval.c[7] = tmpval.c[0];
134
135 return retval.ui;
136 } else
137 return value;
138 }
139
140 #define elf_getu16(swap, value) getu16(swap, value)
141 #define elf_getu32(swap, value) getu32(swap, value)
142 #define elf_getu64(swap, value) getu64(swap, value)
143
144 #define xsh_addr (clazz == ELFCLASS32 \
145 ? CAST(void *, &sh32) \
146 : CAST(void *, &sh64))
147 #define xsh_sizeof (clazz == ELFCLASS32 \
148 ? sizeof(sh32) \
149 : sizeof(sh64))
150 #define xsh_size CAST(size_t, (clazz == ELFCLASS32 \
151 ? elf_getu32(swap, sh32.sh_size) \
152 : elf_getu64(swap, sh64.sh_size)))
153 #define xsh_offset CAST(off_t, (clazz == ELFCLASS32 \
154 ? elf_getu32(swap, sh32.sh_offset) \
155 : elf_getu64(swap, sh64.sh_offset)))
156 #define xsh_type (clazz == ELFCLASS32 \
157 ? elf_getu32(swap, sh32.sh_type) \
158 : elf_getu32(swap, sh64.sh_type))
159 #define xsh_name (clazz == ELFCLASS32 \
160 ? elf_getu32(swap, sh32.sh_name) \
161 : elf_getu32(swap, sh64.sh_name))
162
163 #define xph_addr (clazz == ELFCLASS32 \
164 ? CAST(void *, &ph32) \
165 : CAST(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 CAST(off_t, (clazz == ELFCLASS32 \
173 ? elf_getu32(swap, ph32.p_offset) \
174 : elf_getu64(swap, ph64.p_offset)))
175 #define xph_align CAST(size_t, (clazz == ELFCLASS32 \
176 ? CAST(off_t, (ph32.p_align ? \
177 elf_getu32(swap, ph32.p_align) : 4))\
178 : CAST(off_t, (ph64.p_align ? \
179 elf_getu64(swap, ph64.p_align) : 4))))
180 #define xph_vaddr CAST(size_t, (clazz == ELFCLASS32 \
181 ? CAST(off_t, (ph32.p_vaddr ? \
182 elf_getu32(swap, ph32.p_vaddr) : 4))\
183 : CAST(off_t, (ph64.p_vaddr ? \
184 elf_getu64(swap, ph64.p_vaddr) : 4))))
185 #define xph_filesz CAST(size_t, (clazz == ELFCLASS32 \
186 ? elf_getu32(swap, ph32.p_filesz) \
187 : elf_getu64(swap, ph64.p_filesz)))
188 #define xph_memsz CAST(size_t, ((clazz == ELFCLASS32 \
189 ? elf_getu32(swap, ph32.p_memsz) \
190 : elf_getu64(swap, ph64.p_memsz))))
191 #define xnh_addr (clazz == ELFCLASS32 \
192 ? CAST(void *, &nh32) \
193 : CAST(void *, &nh64))
194 #define xnh_sizeof (clazz == ELFCLASS32 \
195 ? sizeof(nh32) \
196 : sizeof(nh64))
197 #define xnh_type (clazz == ELFCLASS32 \
198 ? elf_getu32(swap, nh32.n_type) \
199 : elf_getu32(swap, nh64.n_type))
200 #define xnh_namesz (clazz == ELFCLASS32 \
201 ? elf_getu32(swap, nh32.n_namesz) \
202 : elf_getu32(swap, nh64.n_namesz))
203 #define xnh_descsz (clazz == ELFCLASS32 \
204 ? elf_getu32(swap, nh32.n_descsz) \
205 : elf_getu32(swap, nh64.n_descsz))
206
207 #define xdh_addr (clazz == ELFCLASS32 \
208 ? CAST(void *, &dh32) \
209 : CAST(void *, &dh64))
210 #define xdh_sizeof (clazz == ELFCLASS32 \
211 ? sizeof(dh32) \
212 : sizeof(dh64))
213 #define xdh_tag (clazz == ELFCLASS32 \
214 ? elf_getu32(swap, dh32.d_tag) \
215 : elf_getu64(swap, dh64.d_tag))
216 #define xdh_val (clazz == ELFCLASS32 \
217 ? elf_getu32(swap, dh32.d_un.d_val) \
218 : elf_getu64(swap, dh64.d_un.d_val))
219
220 #define xcap_addr (clazz == ELFCLASS32 \
221 ? CAST(void *, &cap32) \
222 : CAST(void *, &cap64))
223 #define xcap_sizeof (clazz == ELFCLASS32 \
224 ? sizeof(cap32) \
225 : sizeof(cap64))
226 #define xcap_tag (clazz == ELFCLASS32 \
227 ? elf_getu32(swap, cap32.c_tag) \
228 : elf_getu64(swap, cap64.c_tag))
229 #define xcap_val (clazz == ELFCLASS32 \
230 ? elf_getu32(swap, cap32.c_un.c_val) \
231 : elf_getu64(swap, cap64.c_un.c_val))
232
233 #define xauxv_addr (clazz == ELFCLASS32 \
234 ? CAST(void *, &auxv32) \
235 : CAST(void *, &auxv64))
236 #define xauxv_sizeof (clazz == ELFCLASS32 \
237 ? sizeof(auxv32) \
238 : sizeof(auxv64))
239 #define xauxv_type (clazz == ELFCLASS32 \
240 ? elf_getu32(swap, auxv32.a_type) \
241 : elf_getu64(swap, auxv64.a_type))
242 #define xauxv_val (clazz == ELFCLASS32 \
243 ? elf_getu32(swap, auxv32.a_v) \
244 : elf_getu64(swap, auxv64.a_v))
245
246 #define prpsoffsets(i) (clazz == ELFCLASS32 \
247 ? prpsoffsets32[i] \
248 : prpsoffsets64[i])
249
250 #ifdef ELFCORE
251 /*
252 * Try larger offsets first to avoid false matches
253 * from earlier data that happen to look like strings.
254 */
255 static const size_t prpsoffsets32[] = {
256 #ifdef USE_NT_PSINFO
257 104, /* SunOS 5.x (command line) */
258 88, /* SunOS 5.x (short name) */
259 #endif /* USE_NT_PSINFO */
260
261 100, /* SunOS 5.x (command line) */
262 84, /* SunOS 5.x (short name) */
263
264 44, /* Linux (command line) */
265 28, /* Linux (short name) */
266
267 48, /* Linux PowerPC (command line) */
268 32, /* Linux PowerPC (short name) */
269
270 8, /* FreeBSD */
271 };
272
273 static const size_t prpsoffsets64[] = {
274 #ifdef USE_NT_PSINFO
275 152, /* SunOS 5.x (command line) */
276 136, /* SunOS 5.x (short name) */
277 #endif /* USE_NT_PSINFO */
278
279 136, /* SunOS 5.x, 64-bit (command line) */
280 120, /* SunOS 5.x, 64-bit (short name) */
281
282 56, /* Linux (command line) */
283 40, /* Linux (tested on core from 2.4.x, short name) */
284
285 16, /* FreeBSD, 64-bit */
286 };
287
288 #define NOFFSETS32 __arraycount(prpsoffsets32)
289 #define NOFFSETS64 __arraycount(prpsoffsets64)
290
291 #define NOFFSETS (clazz == ELFCLASS32 ? NOFFSETS32 : NOFFSETS64)
292
293 /*
294 * Look through the program headers of an executable image, searching
295 * for a PT_NOTE section of type NT_PRPSINFO, with a name "CORE" or
296 * "FreeBSD"; if one is found, try looking in various places in its
297 * contents for a 16-character string containing only printable
298 * characters - if found, that string should be the name of the program
299 * that dropped core. Note: right after that 16-character string is,
300 * at least in SunOS 5.x (and possibly other SVR4-flavored systems) and
301 * Linux, a longer string (80 characters, in 5.x, probably other
302 * SVR4-flavored systems, and Linux) containing the start of the
303 * command line for that program.
304 *
305 * SunOS 5.x core files contain two PT_NOTE sections, with the types
306 * NT_PRPSINFO (old) and NT_PSINFO (new). These structs contain the
307 * same info about the command name and command line, so it probably
308 * isn't worthwhile to look for NT_PSINFO, but the offsets are provided
309 * above (see USE_NT_PSINFO), in case we ever decide to do so. The
310 * NT_PRPSINFO and NT_PSINFO sections are always in order and adjacent;
311 * the SunOS 5.x file command relies on this (and prefers the latter).
312 *
313 * The signal number probably appears in a section of type NT_PRSTATUS,
314 * but that's also rather OS-dependent, in ways that are harder to
315 * dissect with heuristics, so I'm not bothering with the signal number.
316 * (I suppose the signal number could be of interest in situations where
317 * you don't have the binary of the program that dropped core; if you
318 * *do* have that binary, the debugger will probably tell you what
319 * signal it was.)
320 */
321
322 #define OS_STYLE_SVR4 0
323 #define OS_STYLE_FREEBSD 1
324 #define OS_STYLE_NETBSD 2
325
326 private const char os_style_names[][8] = {
327 "SVR4",
328 "FreeBSD",
329 "NetBSD",
330 };
331
332 #define FLAGS_CORE_STYLE 0x0003
333
334 #define FLAGS_DID_CORE 0x0004
335 #define FLAGS_DID_OS_NOTE 0x0008
336 #define FLAGS_DID_BUILD_ID 0x0010
337 #define FLAGS_DID_CORE_STYLE 0x0020
338 #define FLAGS_DID_NETBSD_PAX 0x0040
339 #define FLAGS_DID_NETBSD_MARCH 0x0080
340 #define FLAGS_DID_NETBSD_CMODEL 0x0100
341 #define FLAGS_DID_NETBSD_EMULATION 0x0200
342 #define FLAGS_DID_NETBSD_UNKNOWN 0x0400
343 #define FLAGS_IS_CORE 0x0800
344 #define FLAGS_DID_AUXV 0x1000
345
346 private int
347 dophn_core(struct magic_set *ms, int clazz, int swap, int fd, off_t off,
348 int num, size_t size, off_t fsize, int *flags, uint16_t *notecount)
349 {
350 Elf32_Phdr ph32;
351 Elf64_Phdr ph64;
352 size_t offset, len;
353 unsigned char nbuf[BUFSIZ];
354 ssize_t bufsize;
355 off_t ph_off = off;
356 int ph_num = num;
357
358 if (num == 0) {
359 if (file_printf(ms, ", no program header") == -1)
360 return -1;
361 return 0;
362 }
363 if (size != xph_sizeof) {
364 if (file_printf(ms, ", corrupted program header size") == -1)
365 return -1;
366 return 0;
367 }
368
369 /*
370 * Loop through all the program headers.
371 */
372 for ( ; num; num--) {
373 if (pread(fd, xph_addr, xph_sizeof, off) <
374 CAST(ssize_t, xph_sizeof)) {
375 file_badread(ms);
376 return -1;
377 }
378 off += size;
379
380 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) {
381 /* Perhaps warn here */
382 continue;
383 }
384
385 if (xph_type != PT_NOTE)
386 continue;
387
388 /*
389 * This is a PT_NOTE section; loop through all the notes
390 * in the section.
391 */
392 len = xph_filesz < sizeof(nbuf) ? xph_filesz : sizeof(nbuf);
393 if ((bufsize = pread(fd, nbuf, len, xph_offset)) == -1) {
394 file_badread(ms);
395 return -1;
396 }
397 offset = 0;
398 for (;;) {
399 if (offset >= CAST(size_t, bufsize))
400 break;
401 offset = donote(ms, nbuf, offset, CAST(size_t, bufsize),
402 clazz, swap, 4, flags, notecount, fd, ph_off,
403 ph_num, fsize);
404 if (offset == 0)
405 break;
406
407 }
408 }
409 return 0;
410 }
411 #endif
412
413 static int
414 do_note_netbsd_version(struct magic_set *ms, int swap, void *v)
415 {
416 uint32_t desc;
417 memcpy(&desc, v, sizeof(desc));
418 desc = elf_getu32(swap, desc);
419
420 if (file_printf(ms, ", for NetBSD") == -1)
421 return -1;
422 /*
423 * The version number used to be stuck as 199905, and was thus
424 * basically content-free. Newer versions of NetBSD have fixed
425 * this and now use the encoding of __NetBSD_Version__:
426 *
427 * MMmmrrpp00
428 *
429 * M = major version
430 * m = minor version
431 * r = release ["",A-Z,Z[A-Z] but numeric]
432 * p = patchlevel
433 */
434 if (desc > 100000000U) {
435 uint32_t ver_patch = (desc / 100) % 100;
436 uint32_t ver_rel = (desc / 10000) % 100;
437 uint32_t ver_min = (desc / 1000000) % 100;
438 uint32_t ver_maj = desc / 100000000;
439
440 if (file_printf(ms, " %u.%u", ver_maj, ver_min) == -1)
441 return -1;
442 if (ver_rel == 0 && ver_patch != 0) {
443 if (file_printf(ms, ".%u", ver_patch) == -1)
444 return -1;
445 } else if (ver_rel != 0) {
446 while (ver_rel > 26) {
447 if (file_printf(ms, "Z") == -1)
448 return -1;
449 ver_rel -= 26;
450 }
451 if (file_printf(ms, "%c", 'A' + ver_rel - 1)
452 == -1)
453 return -1;
454 }
455 }
456 return 0;
457 }
458
459 static int
460 do_note_freebsd_version(struct magic_set *ms, int swap, void *v)
461 {
462 uint32_t desc;
463
464 memcpy(&desc, v, sizeof(desc));
465 desc = elf_getu32(swap, desc);
466 if (file_printf(ms, ", for FreeBSD") == -1)
467 return -1;
468
469 /*
470 * Contents is __FreeBSD_version, whose relation to OS
471 * versions is defined by a huge table in the Porter's
472 * Handbook. This is the general scheme:
473 *
474 * Releases:
475 * Mmp000 (before 4.10)
476 * Mmi0p0 (before 5.0)
477 * Mmm0p0
478 *
479 * Development branches:
480 * Mmpxxx (before 4.6)
481 * Mmp1xx (before 4.10)
482 * Mmi1xx (before 5.0)
483 * M000xx (pre-M.0)
484 * Mmm1xx
485 *
486 * M = major version
487 * m = minor version
488 * i = minor version increment (491000 -> 4.10)
489 * p = patchlevel
490 * x = revision
491 *
492 * The first release of FreeBSD to use ELF by default
493 * was version 3.0.
494 */
495 if (desc == 460002) {
496 if (file_printf(ms, " 4.6.2") == -1)
497 return -1;
498 } else if (desc < 460100) {
499 if (file_printf(ms, " %d.%d", desc / 100000,
500 desc / 10000 % 10) == -1)
501 return -1;
502 if (desc / 1000 % 10 > 0)
503 if (file_printf(ms, ".%d", desc / 1000 % 10) == -1)
504 return -1;
505 if ((desc % 1000 > 0) || (desc % 100000 == 0))
506 if (file_printf(ms, " (%d)", desc) == -1)
507 return -1;
508 } else if (desc < 500000) {
509 if (file_printf(ms, " %d.%d", desc / 100000,
510 desc / 10000 % 10 + desc / 1000 % 10) == -1)
511 return -1;
512 if (desc / 100 % 10 > 0) {
513 if (file_printf(ms, " (%d)", desc) == -1)
514 return -1;
515 } else if (desc / 10 % 10 > 0) {
516 if (file_printf(ms, ".%d", desc / 10 % 10) == -1)
517 return -1;
518 }
519 } else {
520 if (file_printf(ms, " %d.%d", desc / 100000,
521 desc / 1000 % 100) == -1)
522 return -1;
523 if ((desc / 100 % 10 > 0) ||
524 (desc % 100000 / 100 == 0)) {
525 if (file_printf(ms, " (%d)", desc) == -1)
526 return -1;
527 } else if (desc / 10 % 10 > 0) {
528 if (file_printf(ms, ".%d", desc / 10 % 10) == -1)
529 return -1;
530 }
531 }
532 return 0;
533 }
534
535 private int
536 /*ARGSUSED*/
537 do_bid_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type,
538 int swap __attribute__((__unused__)), uint32_t namesz, uint32_t descsz,
539 size_t noff, size_t doff, int *flags)
540 {
541 if (namesz == 4 && strcmp(RCAST(char *, &nbuf[noff]), "GNU") == 0 &&
542 type == NT_GNU_BUILD_ID && (descsz >= 4 && descsz <= 20)) {
543 uint8_t desc[20];
544 const char *btype;
545 uint32_t i;
546 *flags |= FLAGS_DID_BUILD_ID;
547 switch (descsz) {
548 case 8:
549 btype = "xxHash";
550 break;
551 case 16:
552 btype = "md5/uuid";
553 break;
554 case 20:
555 btype = "sha1";
556 break;
557 default:
558 btype = "unknown";
559 break;
560 }
561 if (file_printf(ms, ", BuildID[%s]=", btype) == -1)
562 return -1;
563 memcpy(desc, &nbuf[doff], descsz);
564 for (i = 0; i < descsz; i++)
565 if (file_printf(ms, "%02x", desc[i]) == -1)
566 return -1;
567 return 1;
568 }
569 if (namesz == 4 && strcmp(RCAST(char *, &nbuf[noff]), "Go") == 0 &&
570 type == NT_GO_BUILD_ID && descsz < 128) {
571 if (file_printf(ms, ", Go BuildID=%.*s",
572 CAST(int, descsz), RCAST(char *, &nbuf[doff])) == -1)
573 return -1;
574 return 1;
575 }
576 return 0;
577 }
578
579 private int
580 do_os_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type,
581 int swap, uint32_t namesz, uint32_t descsz,
582 size_t noff, size_t doff, int *flags)
583 {
584 const char *name = RCAST(const char *, &nbuf[noff]);
585
586 if (namesz == 5 && strcmp(name, "SuSE") == 0 &&
587 type == NT_GNU_VERSION && descsz == 2) {
588 *flags |= FLAGS_DID_OS_NOTE;
589 if (file_printf(ms, ", for SuSE %d.%d", nbuf[doff],
590 nbuf[doff + 1]) == -1)
591 return -1;
592 return 1;
593 }
594
595 if (namesz == 4 && strcmp(name, "GNU") == 0 &&
596 type == NT_GNU_VERSION && descsz == 16) {
597 uint32_t desc[4];
598 memcpy(desc, &nbuf[doff], sizeof(desc));
599
600 *flags |= FLAGS_DID_OS_NOTE;
601 if (file_printf(ms, ", for GNU/") == -1)
602 return -1;
603 switch (elf_getu32(swap, desc[0])) {
604 case GNU_OS_LINUX:
605 if (file_printf(ms, "Linux") == -1)
606 return -1;
607 break;
608 case GNU_OS_HURD:
609 if (file_printf(ms, "Hurd") == -1)
610 return -1;
611 break;
612 case GNU_OS_SOLARIS:
613 if (file_printf(ms, "Solaris") == -1)
614 return -1;
615 break;
616 case GNU_OS_KFREEBSD:
617 if (file_printf(ms, "kFreeBSD") == -1)
618 return -1;
619 break;
620 case GNU_OS_KNETBSD:
621 if (file_printf(ms, "kNetBSD") == -1)
622 return -1;
623 break;
624 default:
625 if (file_printf(ms, "<unknown>") == -1)
626 return -1;
627 }
628 if (file_printf(ms, " %d.%d.%d", elf_getu32(swap, desc[1]),
629 elf_getu32(swap, desc[2]), elf_getu32(swap, desc[3])) == -1)
630 return -1;
631 return 1;
632 }
633
634 if (namesz == 7 && strcmp(name, "NetBSD") == 0) {
635 if (type == NT_NETBSD_VERSION && descsz == 4) {
636 *flags |= FLAGS_DID_OS_NOTE;
637 if (do_note_netbsd_version(ms, swap, &nbuf[doff]) == -1)
638 return -1;
639 return 1;
640 }
641 }
642
643 if (namesz == 8 && strcmp(name, "FreeBSD") == 0) {
644 if (type == NT_FREEBSD_VERSION && descsz == 4) {
645 *flags |= FLAGS_DID_OS_NOTE;
646 if (do_note_freebsd_version(ms, swap, &nbuf[doff])
647 == -1)
648 return -1;
649 return 1;
650 }
651 }
652
653 if (namesz == 8 && strcmp(name, "OpenBSD") == 0 &&
654 type == NT_OPENBSD_VERSION && descsz == 4) {
655 *flags |= FLAGS_DID_OS_NOTE;
656 if (file_printf(ms, ", for OpenBSD") == -1)
657 return -1;
658 /* Content of note is always 0 */
659 return 1;
660 }
661
662 if (namesz == 10 && strcmp(name, "DragonFly") == 0 &&
663 type == NT_DRAGONFLY_VERSION && descsz == 4) {
664 uint32_t desc;
665 *flags |= FLAGS_DID_OS_NOTE;
666 if (file_printf(ms, ", for DragonFly") == -1)
667 return -1;
668 memcpy(&desc, &nbuf[doff], sizeof(desc));
669 desc = elf_getu32(swap, desc);
670 if (file_printf(ms, " %d.%d.%d", desc / 100000,
671 desc / 10000 % 10, desc % 10000) == -1)
672 return -1;
673 return 1;
674 }
675 return 0;
676 }
677
678 private int
679 do_pax_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type,
680 int swap, uint32_t namesz, uint32_t descsz,
681 size_t noff, size_t doff, int *flags)
682 {
683 const char *name = RCAST(const char *, &nbuf[noff]);
684
685 if (namesz == 4 && strcmp(name, "PaX") == 0 &&
686 type == NT_NETBSD_PAX && descsz == 4) {
687 static const char *pax[] = {
688 "+mprotect",
689 "-mprotect",
690 "+segvguard",
691 "-segvguard",
692 "+ASLR",
693 "-ASLR",
694 };
695 uint32_t desc;
696 size_t i;
697 int did = 0;
698
699 *flags |= FLAGS_DID_NETBSD_PAX;
700 memcpy(&desc, &nbuf[doff], sizeof(desc));
701 desc = elf_getu32(swap, desc);
702
703 if (desc && file_printf(ms, ", PaX: ") == -1)
704 return -1;
705
706 for (i = 0; i < __arraycount(pax); i++) {
707 if (((1 << CAST(int, i)) & desc) == 0)
708 continue;
709 if (file_printf(ms, "%s%s", did++ ? "," : "",
710 pax[i]) == -1)
711 return -1;
712 }
713 return 1;
714 }
715 return 0;
716 }
717
718 private int
719 do_core_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type,
720 int swap, uint32_t namesz, uint32_t descsz,
721 size_t noff, size_t doff, int *flags, size_t size, int clazz)
722 {
723 #ifdef ELFCORE
724 const char *name = RCAST(const char *, &nbuf[noff]);
725
726 int os_style = -1;
727 /*
728 * Sigh. The 2.0.36 kernel in Debian 2.1, at
729 * least, doesn't correctly implement name
730 * sections, in core dumps, as specified by
731 * the "Program Linking" section of "UNIX(R) System
732 * V Release 4 Programmer's Guide: ANSI C and
733 * Programming Support Tools", because my copy
734 * clearly says "The first 'namesz' bytes in 'name'
735 * contain a *null-terminated* [emphasis mine]
736 * character representation of the entry's owner
737 * or originator", but the 2.0.36 kernel code
738 * doesn't include the terminating null in the
739 * name....
740 */
741 if ((namesz == 4 && strncmp(name, "CORE", 4) == 0) ||
742 (namesz == 5 && strcmp(name, "CORE") == 0)) {
743 os_style = OS_STYLE_SVR4;
744 }
745
746 if ((namesz == 8 && strcmp(name, "FreeBSD") == 0)) {
747 os_style = OS_STYLE_FREEBSD;
748 }
749
750 if ((namesz >= 11 && strncmp(name, "NetBSD-CORE", 11)
751 == 0)) {
752 os_style = OS_STYLE_NETBSD;
753 }
754
755 if (os_style != -1 && (*flags & FLAGS_DID_CORE_STYLE) == 0) {
756 if (file_printf(ms, ", %s-style", os_style_names[os_style])
757 == -1)
758 return -1;
759 *flags |= FLAGS_DID_CORE_STYLE;
760 *flags |= os_style;
761 }
762
763 switch (os_style) {
764 case OS_STYLE_NETBSD:
765 if (type == NT_NETBSD_CORE_PROCINFO) {
766 char sbuf[512];
767 struct NetBSD_elfcore_procinfo pi;
768 memset(&pi, 0, sizeof(pi));
769 memcpy(&pi, nbuf + doff, MIN(descsz, sizeof(pi)));
770
771 if (file_printf(ms, ", from '%.31s', pid=%u, uid=%u, "
772 "gid=%u, nlwps=%u, lwp=%u (signal %u/code %u)",
773 file_printable(sbuf, sizeof(sbuf),
774 RCAST(char *, pi.cpi_name), sizeof(pi.cpi_name)),
775 elf_getu32(swap, CAST(uint32_t, pi.cpi_pid)),
776 elf_getu32(swap, pi.cpi_euid),
777 elf_getu32(swap, pi.cpi_egid),
778 elf_getu32(swap, pi.cpi_nlwps),
779 elf_getu32(swap, CAST(uint32_t, pi.cpi_siglwp)),
780 elf_getu32(swap, pi.cpi_signo),
781 elf_getu32(swap, pi.cpi_sigcode)) == -1)
782 return -1;
783
784 *flags |= FLAGS_DID_CORE;
785 return 1;
786 }
787 break;
788
789 case OS_STYLE_FREEBSD:
790 if (type == NT_PRPSINFO && *flags & FLAGS_IS_CORE) {
791 size_t argoff, pidoff;
792
793 if (clazz == ELFCLASS32)
794 argoff = 4 + 4 + 17;
795 else
796 argoff = 4 + 4 + 8 + 17;
797 if (file_printf(ms, ", from '%.80s'", nbuf + doff +
798 argoff) == -1)
799 return -1;
800 pidoff = argoff + 81 + 2;
801 if (doff + pidoff + 4 <= size) {
802 if (file_printf(ms, ", pid=%u",
803 elf_getu32(swap, *RCAST(uint32_t *, (nbuf +
804 doff + pidoff)))) == -1)
805 return -1;
806 }
807 *flags |= FLAGS_DID_CORE;
808 }
809 break;
810
811 default:
812 if (type == NT_PRPSINFO && *flags & FLAGS_IS_CORE) {
813 size_t i, j;
814 unsigned char c;
815 /*
816 * Extract the program name. We assume
817 * it to be 16 characters (that's what it
818 * is in SunOS 5.x and Linux).
819 *
820 * Unfortunately, it's at a different offset
821 * in various OSes, so try multiple offsets.
822 * If the characters aren't all printable,
823 * reject it.
824 */
825 for (i = 0; i < NOFFSETS; i++) {
826 unsigned char *cname, *cp;
827 size_t reloffset = prpsoffsets(i);
828 size_t noffset = doff + reloffset;
829 size_t k;
830 for (j = 0; j < 16; j++, noffset++,
831 reloffset++) {
832 /*
833 * Make sure we're not past
834 * the end of the buffer; if
835 * we are, just give up.
836 */
837 if (noffset >= size)
838 goto tryanother;
839
840 /*
841 * Make sure we're not past
842 * the end of the contents;
843 * if we are, this obviously
844 * isn't the right offset.
845 */
846 if (reloffset >= descsz)
847 goto tryanother;
848
849 c = nbuf[noffset];
850 if (c == '\0') {
851 /*
852 * A '\0' at the
853 * beginning is
854 * obviously wrong.
855 * Any other '\0'
856 * means we're done.
857 */
858 if (j == 0)
859 goto tryanother;
860 else
861 break;
862 } else {
863 /*
864 * A nonprintable
865 * character is also
866 * wrong.
867 */
868 if (!isprint(c) || isquote(c))
869 goto tryanother;
870 }
871 }
872 /*
873 * Well, that worked.
874 */
875
876 /*
877 * Try next offsets, in case this match is
878 * in the middle of a string.
879 */
880 for (k = i + 1 ; k < NOFFSETS; k++) {
881 size_t no;
882 int adjust = 1;
883 if (prpsoffsets(k) >= prpsoffsets(i))
884 continue;
885 for (no = doff + prpsoffsets(k);
886 no < doff + prpsoffsets(i); no++)
887 adjust = adjust
888 && isprint(nbuf[no]);
889 if (adjust)
890 i = k;
891 }
892
893 cname = CAST(unsigned char *,
894 &nbuf[doff + prpsoffsets(i)]);
895 for (cp = cname; cp < nbuf + size && *cp
896 && isprint(*cp); cp++)
897 continue;
898 /*
899 * Linux apparently appends a space at the end
900 * of the command line: remove it.
901 */
902 while (cp > cname && isspace(cp[-1]))
903 cp--;
904 if (file_printf(ms, ", from '%.*s'",
905 CAST(int, cp - cname), cname) == -1)
906 return -1;
907 *flags |= FLAGS_DID_CORE;
908 return 1;
909
910 tryanother:
911 ;
912 }
913 }
914 break;
915 }
916 #endif
917 return 0;
918 }
919
920 private off_t
921 get_offset_from_virtaddr(struct magic_set *ms, int swap, int clazz, int fd,
922 off_t off, int num, off_t fsize, uint64_t virtaddr)
923 {
924 Elf32_Phdr ph32;
925 Elf64_Phdr ph64;
926
927 /*
928 * Loop through all the program headers and find the header with
929 * virtual address in which the "virtaddr" belongs to.
930 */
931 for ( ; num; num--) {
932 if (pread(fd, xph_addr, xph_sizeof, off) <
933 CAST(ssize_t, xph_sizeof)) {
934 file_badread(ms);
935 return -1;
936 }
937 off += xph_sizeof;
938
939 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) {
940 /* Perhaps warn here */
941 continue;
942 }
943
944 if (virtaddr >= xph_vaddr && virtaddr < xph_vaddr + xph_filesz)
945 return xph_offset + (virtaddr - xph_vaddr);
946 }
947 return 0;
948 }
949
950 private size_t
951 get_string_on_virtaddr(struct magic_set *ms,
952 int swap, int clazz, int fd, off_t ph_off, int ph_num,
953 off_t fsize, uint64_t virtaddr, char *buf, ssize_t buflen)
954 {
955 char *bptr;
956 off_t offset;
957
958 if (buflen == 0)
959 return 0;
960
961 offset = get_offset_from_virtaddr(ms, swap, clazz, fd, ph_off, ph_num,
962 fsize, virtaddr);
963 if (offset < 0 ||
964 (buflen = pread(fd, buf, CAST(size_t, buflen), offset)) <= 0) {
965 file_badread(ms);
966 return 0;
967 }
968
969 buf[buflen - 1] = '\0';
970
971 /* We expect only printable characters, so return if buffer contains
972 * non-printable character before the '\0' or just '\0'. */
973 for (bptr = buf; *bptr && isprint(CAST(unsigned char, *bptr)); bptr++)
974 continue;
975 if (*bptr != '\0')
976 return 0;
977
978 return bptr - buf;
979 }
980
981
982 /*ARGSUSED*/
983 private int
984 do_auxv_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type,
985 int swap, uint32_t namesz __attribute__((__unused__)),
986 uint32_t descsz __attribute__((__unused__)),
987 size_t noff __attribute__((__unused__)), size_t doff,
988 int *flags, size_t size __attribute__((__unused__)), int clazz,
989 int fd, off_t ph_off, int ph_num, off_t fsize)
990 {
991 #ifdef ELFCORE
992 Aux32Info auxv32;
993 Aux64Info auxv64;
994 size_t elsize = xauxv_sizeof;
995 const char *tag;
996 int is_string;
997 size_t nval;
998
999 if ((*flags & (FLAGS_IS_CORE|FLAGS_DID_CORE_STYLE)) !=
1000 (FLAGS_IS_CORE|FLAGS_DID_CORE_STYLE))
1001 return 0;
1002
1003 switch (*flags & FLAGS_CORE_STYLE) {
1004 case OS_STYLE_SVR4:
1005 if (type != NT_AUXV)
1006 return 0;
1007 break;
1008 #ifdef notyet
1009 case OS_STYLE_NETBSD:
1010 if (type != NT_NETBSD_CORE_AUXV)
1011 return 0;
1012 break;
1013 case OS_STYLE_FREEBSD:
1014 if (type != NT_FREEBSD_PROCSTAT_AUXV)
1015 return 0;
1016 break;
1017 #endif
1018 default:
1019 return 0;
1020 }
1021
1022 *flags |= FLAGS_DID_AUXV;
1023
1024 nval = 0;
1025 for (size_t off = 0; off + elsize <= descsz; off += elsize) {
1026 memcpy(xauxv_addr, &nbuf[doff + off], xauxv_sizeof);
1027 /* Limit processing to 50 vector entries to prevent DoS */
1028 if (nval++ >= 50) {
1029 file_error(ms, 0, "Too many ELF Auxv elements");
1030 return 1;
1031 }
1032
1033 switch(xauxv_type) {
1034 case AT_LINUX_EXECFN:
1035 is_string = 1;
1036 tag = "execfn";
1037 break;
1038 case AT_LINUX_PLATFORM:
1039 is_string = 1;
1040 tag = "platform";
1041 break;
1042 case AT_LINUX_UID:
1043 is_string = 0;
1044 tag = "real uid";
1045 break;
1046 case AT_LINUX_GID:
1047 is_string = 0;
1048 tag = "real gid";
1049 break;
1050 case AT_LINUX_EUID:
1051 is_string = 0;
1052 tag = "effective uid";
1053 break;
1054 case AT_LINUX_EGID:
1055 is_string = 0;
1056 tag = "effective gid";
1057 break;
1058 default:
1059 is_string = 0;
1060 tag = NULL;
1061 break;
1062 }
1063
1064 if (tag == NULL)
1065 continue;
1066
1067 if (is_string) {
1068 char buf[256];
1069 ssize_t buflen;
1070 buflen = get_string_on_virtaddr(ms, swap, clazz, fd,
1071 ph_off, ph_num, fsize, xauxv_val, buf, sizeof(buf));
1072
1073 if (buflen == 0)
1074 continue;
1075
1076 if (file_printf(ms, ", %s: '%s'", tag, buf) == -1)
1077 return -1;
1078 } else {
1079 if (file_printf(ms, ", %s: %d", tag,
1080 CAST(int, xauxv_val)) == -1)
1081 return -1;
1082 }
1083 }
1084 return 1;
1085 #else
1086 return 0;
1087 #endif
1088 }
1089
1090 private size_t
1091 dodynamic(struct magic_set *ms, void *vbuf, size_t offset, size_t size,
1092 int clazz, int swap)
1093 {
1094 Elf32_Dyn dh32;
1095 Elf64_Dyn dh64;
1096 unsigned char *dbuf = CAST(unsigned char *, vbuf);
1097
1098 if (xdh_sizeof + offset > size) {
1099 /*
1100 * We're out of note headers.
1101 */
1102 return xdh_sizeof + offset;
1103 }
1104
1105 memcpy(xdh_addr, &dbuf[offset], xdh_sizeof);
1106 offset += xdh_sizeof;
1107
1108 switch (xdh_tag) {
1109 case DT_FLAGS_1:
1110 if (xdh_val & DF_1_PIE)
1111 ms->mode |= 0111;
1112 else
1113 ms->mode &= ~0111;
1114 break;
1115 default:
1116 break;
1117 }
1118 return offset;
1119 }
1120
1121
1122 private size_t
1123 donote(struct magic_set *ms, void *vbuf, size_t offset, size_t size,
1124 int clazz, int swap, size_t align, int *flags, uint16_t *notecount,
1125 int fd, off_t ph_off, int ph_num, off_t fsize)
1126 {
1127 Elf32_Nhdr nh32;
1128 Elf64_Nhdr nh64;
1129 size_t noff, doff;
1130 uint32_t namesz, descsz;
1131 unsigned char *nbuf = CAST(unsigned char *, vbuf);
1132
1133 if (*notecount == 0)
1134 return 0;
1135 --*notecount;
1136
1137 if (xnh_sizeof + offset > size) {
1138 /*
1139 * We're out of note headers.
1140 */
1141 return xnh_sizeof + offset;
1142 }
1143 /*XXX: GCC */
1144 memset(&nh32, 0, sizeof(nh32));
1145 memset(&nh64, 0, sizeof(nh64));
1146
1147 memcpy(xnh_addr, &nbuf[offset], xnh_sizeof);
1148 offset += xnh_sizeof;
1149
1150 namesz = xnh_namesz;
1151 descsz = xnh_descsz;
1152
1153 if ((namesz == 0) && (descsz == 0)) {
1154 /*
1155 * We're out of note headers.
1156 */
1157 return (offset >= size) ? offset : size;
1158 }
1159
1160 if (namesz & 0x80000000) {
1161 if (file_printf(ms, ", bad note name size %#lx",
1162 CAST(unsigned long, namesz)) == -1)
1163 return -1;
1164 return 0;
1165 }
1166
1167 if (descsz & 0x80000000) {
1168 if (file_printf(ms, ", bad note description size %#lx",
1169 CAST(unsigned long, descsz)) == -1)
1170 return -1;
1171 return 0;
1172 }
1173
1174 noff = offset;
1175 doff = ELF_ALIGN(offset + namesz);
1176
1177 if (offset + namesz > size) {
1178 /*
1179 * We're past the end of the buffer.
1180 */
1181 return doff;
1182 }
1183
1184 offset = ELF_ALIGN(doff + descsz);
1185 if (doff + descsz > size) {
1186 /*
1187 * We're past the end of the buffer.
1188 */
1189 return (offset >= size) ? offset : size;
1190 }
1191
1192
1193 if ((*flags & FLAGS_DID_OS_NOTE) == 0) {
1194 if (do_os_note(ms, nbuf, xnh_type, swap,
1195 namesz, descsz, noff, doff, flags))
1196 return offset;
1197 }
1198
1199 if ((*flags & FLAGS_DID_BUILD_ID) == 0) {
1200 if (do_bid_note(ms, nbuf, xnh_type, swap,
1201 namesz, descsz, noff, doff, flags))
1202 return offset;
1203 }
1204
1205 if ((*flags & FLAGS_DID_NETBSD_PAX) == 0) {
1206 if (do_pax_note(ms, nbuf, xnh_type, swap,
1207 namesz, descsz, noff, doff, flags))
1208 return offset;
1209 }
1210
1211 if ((*flags & FLAGS_DID_CORE) == 0) {
1212 if (do_core_note(ms, nbuf, xnh_type, swap,
1213 namesz, descsz, noff, doff, flags, size, clazz))
1214 return offset;
1215 }
1216
1217 if ((*flags & FLAGS_DID_AUXV) == 0) {
1218 if (do_auxv_note(ms, nbuf, xnh_type, swap,
1219 namesz, descsz, noff, doff, flags, size, clazz,
1220 fd, ph_off, ph_num, fsize))
1221 return offset;
1222 }
1223
1224 if (namesz == 7 && strcmp(RCAST(char *, &nbuf[noff]), "NetBSD") == 0) {
1225 int descw, flag;
1226 const char *str, *tag;
1227 if (descsz > 100)
1228 descsz = 100;
1229 switch (xnh_type) {
1230 case NT_NETBSD_VERSION:
1231 return offset;
1232 case NT_NETBSD_MARCH:
1233 flag = FLAGS_DID_NETBSD_MARCH;
1234 tag = "compiled for";
1235 break;
1236 case NT_NETBSD_CMODEL:
1237 flag = FLAGS_DID_NETBSD_CMODEL;
1238 tag = "compiler model";
1239 break;
1240 case NT_NETBSD_EMULATION:
1241 flag = FLAGS_DID_NETBSD_EMULATION;
1242 tag = "emulation:";
1243 break;
1244 default:
1245 if (*flags & FLAGS_DID_NETBSD_UNKNOWN)
1246 return offset;
1247 *flags |= FLAGS_DID_NETBSD_UNKNOWN;
1248 if (file_printf(ms, ", note=%u", xnh_type) == -1)
1249 return offset;
1250 return offset;
1251 }
1252
1253 if (*flags & flag)
1254 return offset;
1255 str = RCAST(const char *, &nbuf[doff]);
1256 descw = CAST(int, descsz);
1257 *flags |= flag;
1258 file_printf(ms, ", %s: %.*s", tag, descw, str);
1259 return offset;
1260 }
1261
1262 return offset;
1263 }
1264
1265 /* SunOS 5.x hardware capability descriptions */
1266 typedef struct cap_desc {
1267 uint64_t cd_mask;
1268 const char *cd_name;
1269 } cap_desc_t;
1270
1271 static const cap_desc_t cap_desc_sparc[] = {
1272 { AV_SPARC_MUL32, "MUL32" },
1273 { AV_SPARC_DIV32, "DIV32" },
1274 { AV_SPARC_FSMULD, "FSMULD" },
1275 { AV_SPARC_V8PLUS, "V8PLUS" },
1276 { AV_SPARC_POPC, "POPC" },
1277 { AV_SPARC_VIS, "VIS" },
1278 { AV_SPARC_VIS2, "VIS2" },
1279 { AV_SPARC_ASI_BLK_INIT, "ASI_BLK_INIT" },
1280 { AV_SPARC_FMAF, "FMAF" },
1281 { AV_SPARC_FJFMAU, "FJFMAU" },
1282 { AV_SPARC_IMA, "IMA" },
1283 { 0, NULL }
1284 };
1285
1286 static const cap_desc_t cap_desc_386[] = {
1287 { AV_386_FPU, "FPU" },
1288 { AV_386_TSC, "TSC" },
1289 { AV_386_CX8, "CX8" },
1290 { AV_386_SEP, "SEP" },
1291 { AV_386_AMD_SYSC, "AMD_SYSC" },
1292 { AV_386_CMOV, "CMOV" },
1293 { AV_386_MMX, "MMX" },
1294 { AV_386_AMD_MMX, "AMD_MMX" },
1295 { AV_386_AMD_3DNow, "AMD_3DNow" },
1296 { AV_386_AMD_3DNowx, "AMD_3DNowx" },
1297 { AV_386_FXSR, "FXSR" },
1298 { AV_386_SSE, "SSE" },
1299 { AV_386_SSE2, "SSE2" },
1300 { AV_386_PAUSE, "PAUSE" },
1301 { AV_386_SSE3, "SSE3" },
1302 { AV_386_MON, "MON" },
1303 { AV_386_CX16, "CX16" },
1304 { AV_386_AHF, "AHF" },
1305 { AV_386_TSCP, "TSCP" },
1306 { AV_386_AMD_SSE4A, "AMD_SSE4A" },
1307 { AV_386_POPCNT, "POPCNT" },
1308 { AV_386_AMD_LZCNT, "AMD_LZCNT" },
1309 { AV_386_SSSE3, "SSSE3" },
1310 { AV_386_SSE4_1, "SSE4.1" },
1311 { AV_386_SSE4_2, "SSE4.2" },
1312 { 0, NULL }
1313 };
1314
1315 private int
1316 doshn(struct magic_set *ms, int clazz, int swap, int fd, off_t off, int num,
1317 size_t size, off_t fsize, int mach, int strtab, int *flags,
1318 uint16_t *notecount)
1319 {
1320 Elf32_Shdr sh32;
1321 Elf64_Shdr sh64;
1322 int stripped = 1, has_debug_info = 0;
1323 size_t nbadcap = 0;
1324 void *nbuf;
1325 off_t noff, coff, name_off;
1326 uint64_t cap_hw1 = 0; /* SunOS 5.x hardware capabilities */
1327 uint64_t cap_sf1 = 0; /* SunOS 5.x software capabilities */
1328 char name[50];
1329 ssize_t namesize;
1330
1331 if (num == 0) {
1332 if (file_printf(ms, ", no section header") == -1)
1333 return -1;
1334 return 0;
1335 }
1336 if (size != xsh_sizeof) {
1337 if (file_printf(ms, ", corrupted section header size") == -1)
1338 return -1;
1339 return 0;
1340 }
1341
1342 /* Read offset of name section to be able to read section names later */
1343 if (pread(fd, xsh_addr, xsh_sizeof, CAST(off_t, (off + size * strtab)))
1344 < CAST(ssize_t, xsh_sizeof)) {
1345 if (file_printf(ms, ", missing section headers") == -1)
1346 return -1;
1347 return 0;
1348 }
1349 name_off = xsh_offset;
1350
1351 if (fsize != SIZE_UNKNOWN && fsize < name_off) {
1352 if (file_printf(ms, ", too large section header offset %td",
1353 name_off) == -1)
1354 return -1;
1355 return 0;
1356 }
1357
1358 for ( ; num; num--) {
1359 /* Read the name of this section. */
1360 if ((namesize = pread(fd, name, sizeof(name) - 1,
1361 name_off + xsh_name)) == -1) {
1362 file_badread(ms);
1363 return -1;
1364 }
1365 name[namesize] = '\0';
1366 if (strcmp(name, ".debug_info") == 0) {
1367 has_debug_info = 1;
1368 stripped = 0;
1369 }
1370
1371 if (pread(fd, xsh_addr, xsh_sizeof, off) <
1372 CAST(ssize_t, xsh_sizeof)) {
1373 file_badread(ms);
1374 return -1;
1375 }
1376 off += size;
1377
1378 /* Things we can determine before we seek */
1379 switch (xsh_type) {
1380 case SHT_SYMTAB:
1381 #if 0
1382 case SHT_DYNSYM:
1383 #endif
1384 stripped = 0;
1385 break;
1386 default:
1387 if (fsize != SIZE_UNKNOWN && xsh_offset > fsize) {
1388 /* Perhaps warn here */
1389 continue;
1390 }
1391 break;
1392 }
1393
1394
1395 /* Things we can determine when we seek */
1396 switch (xsh_type) {
1397 case SHT_NOTE:
1398 if (CAST(uintmax_t, (xsh_size + xsh_offset)) >
1399 CAST(uintmax_t, fsize)) {
1400 if (file_printf(ms,
1401 ", note offset/size %#" INTMAX_T_FORMAT
1402 "x+%#" INTMAX_T_FORMAT "x exceeds"
1403 " file size %#" INTMAX_T_FORMAT "x",
1404 CAST(uintmax_t, xsh_offset),
1405 CAST(uintmax_t, xsh_size),
1406 CAST(uintmax_t, fsize)) == -1)
1407 return -1;
1408 return 0;
1409 }
1410 if ((nbuf = malloc(xsh_size)) == NULL) {
1411 file_error(ms, errno, "Cannot allocate memory"
1412 " for note");
1413 return -1;
1414 }
1415 if (pread(fd, nbuf, xsh_size, xsh_offset) <
1416 CAST(ssize_t, xsh_size)) {
1417 file_badread(ms);
1418 free(nbuf);
1419 return -1;
1420 }
1421
1422 noff = 0;
1423 for (;;) {
1424 if (noff >= CAST(off_t, xsh_size))
1425 break;
1426 noff = donote(ms, nbuf, CAST(size_t, noff),
1427 xsh_size, clazz, swap, 4, flags, notecount,
1428 fd, 0, 0, 0);
1429 if (noff == 0)
1430 break;
1431 }
1432 free(nbuf);
1433 break;
1434 case SHT_SUNW_cap:
1435 switch (mach) {
1436 case EM_SPARC:
1437 case EM_SPARCV9:
1438 case EM_IA_64:
1439 case EM_386:
1440 case EM_AMD64:
1441 break;
1442 default:
1443 goto skip;
1444 }
1445
1446 if (nbadcap > 5)
1447 break;
1448 if (lseek(fd, xsh_offset, SEEK_SET)
1449 == CAST(off_t, -1)) {
1450 file_badseek(ms);
1451 return -1;
1452 }
1453 coff = 0;
1454 for (;;) {
1455 Elf32_Cap cap32;
1456 Elf64_Cap cap64;
1457 char cbuf[/*CONSTCOND*/
1458 MAX(sizeof(cap32), sizeof(cap64))];
1459 if ((coff += xcap_sizeof) >
1460 CAST(off_t, xsh_size))
1461 break;
1462 if (read(fd, cbuf, CAST(size_t, xcap_sizeof)) !=
1463 CAST(ssize_t, xcap_sizeof)) {
1464 file_badread(ms);
1465 return -1;
1466 }
1467 if (cbuf[0] == 'A') {
1468 #ifdef notyet
1469 char *p = cbuf + 1;
1470 uint32_t len, tag;
1471 memcpy(&len, p, sizeof(len));
1472 p += 4;
1473 len = getu32(swap, len);
1474 if (memcmp("gnu", p, 3) != 0) {
1475 if (file_printf(ms,
1476 ", unknown capability %.3s", p)
1477 == -1)
1478 return -1;
1479 break;
1480 }
1481 p += strlen(p) + 1;
1482 tag = *p++;
1483 memcpy(&len, p, sizeof(len));
1484 p += 4;
1485 len = getu32(swap, len);
1486 if (tag != 1) {
1487 if (file_printf(ms, ", unknown gnu"
1488 " capability tag %d", tag)
1489 == -1)
1490 return -1;
1491 break;
1492 }
1493 // gnu attributes
1494 #endif
1495 break;
1496 }
1497 memcpy(xcap_addr, cbuf, xcap_sizeof);
1498 switch (xcap_tag) {
1499 case CA_SUNW_NULL:
1500 break;
1501 case CA_SUNW_HW_1:
1502 cap_hw1 |= xcap_val;
1503 break;
1504 case CA_SUNW_SF_1:
1505 cap_sf1 |= xcap_val;
1506 break;
1507 default:
1508 if (file_printf(ms,
1509 ", with unknown capability "
1510 "%#" INT64_T_FORMAT "x = %#"
1511 INT64_T_FORMAT "x",
1512 CAST(unsigned long long, xcap_tag),
1513 CAST(unsigned long long, xcap_val))
1514 == -1)
1515 return -1;
1516 if (nbadcap++ > 2)
1517 coff = xsh_size;
1518 break;
1519 }
1520 }
1521 /*FALLTHROUGH*/
1522 skip:
1523 default:
1524 break;
1525 }
1526 }
1527
1528 if (has_debug_info) {
1529 if (file_printf(ms, ", with debug_info") == -1)
1530 return -1;
1531 }
1532 if (file_printf(ms, ", %sstripped", stripped ? "" : "not ") == -1)
1533 return -1;
1534 if (cap_hw1) {
1535 const cap_desc_t *cdp;
1536 switch (mach) {
1537 case EM_SPARC:
1538 case EM_SPARC32PLUS:
1539 case EM_SPARCV9:
1540 cdp = cap_desc_sparc;
1541 break;
1542 case EM_386:
1543 case EM_IA_64:
1544 case EM_AMD64:
1545 cdp = cap_desc_386;
1546 break;
1547 default:
1548 cdp = NULL;
1549 break;
1550 }
1551 if (file_printf(ms, ", uses") == -1)
1552 return -1;
1553 if (cdp) {
1554 while (cdp->cd_name) {
1555 if (cap_hw1 & cdp->cd_mask) {
1556 if (file_printf(ms,
1557 " %s", cdp->cd_name) == -1)
1558 return -1;
1559 cap_hw1 &= ~cdp->cd_mask;
1560 }
1561 ++cdp;
1562 }
1563 if (cap_hw1)
1564 if (file_printf(ms,
1565 " unknown hardware capability %#"
1566 INT64_T_FORMAT "x",
1567 CAST(unsigned long long, cap_hw1)) == -1)
1568 return -1;
1569 } else {
1570 if (file_printf(ms,
1571 " hardware capability %#" INT64_T_FORMAT "x",
1572 CAST(unsigned long long, cap_hw1)) == -1)
1573 return -1;
1574 }
1575 }
1576 if (cap_sf1) {
1577 if (cap_sf1 & SF1_SUNW_FPUSED) {
1578 if (file_printf(ms,
1579 (cap_sf1 & SF1_SUNW_FPKNWN)
1580 ? ", uses frame pointer"
1581 : ", not known to use frame pointer") == -1)
1582 return -1;
1583 }
1584 cap_sf1 &= ~SF1_SUNW_MASK;
1585 if (cap_sf1)
1586 if (file_printf(ms,
1587 ", with unknown software capability %#"
1588 INT64_T_FORMAT "x",
1589 CAST(unsigned long long, cap_sf1)) == -1)
1590 return -1;
1591 }
1592 return 0;
1593 }
1594
1595 /*
1596 * Look through the program headers of an executable image, searching
1597 * for a PT_INTERP section; if one is found, it's dynamically linked,
1598 * otherwise it's statically linked.
1599 */
1600 private int
1601 dophn_exec(struct magic_set *ms, int clazz, int swap, int fd, off_t off,
1602 int num, size_t size, off_t fsize, int sh_num, int *flags,
1603 uint16_t *notecount)
1604 {
1605 Elf32_Phdr ph32;
1606 Elf64_Phdr ph64;
1607 const char *linking_style = "statically";
1608 unsigned char nbuf[BUFSIZ];
1609 char ibuf[BUFSIZ];
1610 char interp[BUFSIZ];
1611 ssize_t bufsize;
1612 size_t offset, align, len;
1613
1614 if (num == 0) {
1615 if (file_printf(ms, ", no program header") == -1)
1616 return -1;
1617 return 0;
1618 }
1619 if (size != xph_sizeof) {
1620 if (file_printf(ms, ", corrupted program header size") == -1)
1621 return -1;
1622 return 0;
1623 }
1624
1625 interp[0] = '\0';
1626 for ( ; num; num--) {
1627 int doread;
1628 if (pread(fd, xph_addr, xph_sizeof, off) <
1629 CAST(ssize_t, xph_sizeof)) {
1630 file_badread(ms);
1631 return -1;
1632 }
1633
1634 off += size;
1635 bufsize = 0;
1636 align = 4;
1637
1638 /* Things we can determine before we seek */
1639 switch (xph_type) {
1640 case PT_DYNAMIC:
1641 doread = 1;
1642 break;
1643 case PT_NOTE:
1644 if (sh_num) /* Did this through section headers */
1645 continue;
1646 if (((align = xph_align) & 0x80000000UL) != 0 ||
1647 align < 4) {
1648 if (file_printf(ms,
1649 ", invalid note alignment %#lx",
1650 CAST(unsigned long, align)) == -1)
1651 return -1;
1652 align = 4;
1653 }
1654 /*FALLTHROUGH*/
1655 case PT_INTERP:
1656 linking_style = "dynamically";
1657 doread = 1;
1658 break;
1659 default:
1660 doread = 0;
1661 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) {
1662 /* Maybe warn here? */
1663 continue;
1664 }
1665 break;
1666 }
1667
1668 if (doread) {
1669 len = xph_filesz < sizeof(nbuf) ? xph_filesz
1670 : sizeof(nbuf);
1671 bufsize = pread(fd, nbuf, len, xph_offset);
1672 if (bufsize == -1) {
1673 file_badread(ms);
1674 return -1;
1675 }
1676 } else
1677 len = 0;
1678
1679 /* Things we can determine when we seek */
1680 switch (xph_type) {
1681 case PT_DYNAMIC:
1682 offset = 0;
1683 // Let DF_1 determine if we are PIE or not.
1684 ms->mode &= ~0111;
1685 for (;;) {
1686 if (offset >= CAST(size_t, bufsize))
1687 break;
1688 offset = dodynamic(ms, nbuf, offset,
1689 CAST(size_t, bufsize), clazz, swap);
1690 if (offset == 0)
1691 break;
1692 }
1693 break;
1694
1695 case PT_INTERP:
1696 if (bufsize && nbuf[0]) {
1697 nbuf[bufsize - 1] = '\0';
1698 memcpy(interp, nbuf, CAST(size_t, bufsize));
1699 } else
1700 strlcpy(interp, "*empty*", sizeof(interp));
1701 break;
1702 case PT_NOTE:
1703 /*
1704 * This is a PT_NOTE section; loop through all the notes
1705 * in the section.
1706 */
1707 offset = 0;
1708 for (;;) {
1709 if (offset >= CAST(size_t, bufsize))
1710 break;
1711 offset = donote(ms, nbuf, offset,
1712 CAST(size_t, bufsize), clazz, swap, align,
1713 flags, notecount, fd, 0, 0, 0);
1714 if (offset == 0)
1715 break;
1716 }
1717 break;
1718 default:
1719 break;
1720 }
1721 }
1722 if (file_printf(ms, ", %s linked", linking_style)
1723 == -1)
1724 return -1;
1725 if (interp[0])
1726 if (file_printf(ms, ", interpreter %s",
1727 file_printable(ibuf, sizeof(ibuf), interp, sizeof(interp)))
1728 == -1)
1729 return -1;
1730 return 0;
1731 }
1732
1733
1734 protected int
1735 file_tryelf(struct magic_set *ms, const struct buffer *b)
1736 {
1737 int fd = b->fd;
1738 const unsigned char *buf = CAST(const unsigned char *, b->fbuf);
1739 size_t nbytes = b->flen;
1740 union {
1741 int32_t l;
1742 char c[sizeof(int32_t)];
1743 } u;
1744 int clazz;
1745 int swap;
1746 struct stat st;
1747 const struct stat *stp;
1748 off_t fsize;
1749 int flags = 0;
1750 Elf32_Ehdr elf32hdr;
1751 Elf64_Ehdr elf64hdr;
1752 uint16_t type, phnum, shnum, notecount;
1753
1754 if (ms->flags & (MAGIC_MIME|MAGIC_APPLE|MAGIC_EXTENSION))
1755 return 0;
1756 /*
1757 * ELF executables have multiple section headers in arbitrary
1758 * file locations and thus file(1) cannot determine it from easily.
1759 * Instead we traverse thru all section headers until a symbol table
1760 * one is found or else the binary is stripped.
1761 * Return immediately if it's not ELF (so we avoid pipe2file unless
1762 * needed).
1763 */
1764 if (buf[EI_MAG0] != ELFMAG0
1765 || (buf[EI_MAG1] != ELFMAG1 && buf[EI_MAG1] != OLFMAG1)
1766 || buf[EI_MAG2] != ELFMAG2 || buf[EI_MAG3] != ELFMAG3)
1767 return 0;
1768
1769 /*
1770 * If we cannot seek, it must be a pipe, socket or fifo.
1771 */
1772 if((lseek(fd, CAST(off_t, 0), SEEK_SET) == CAST(off_t, -1))
1773 && (errno == ESPIPE))
1774 fd = file_pipe2file(ms, fd, buf, nbytes);
1775
1776 if (fd == -1) {
1777 file_badread(ms);
1778 return -1;
1779 }
1780
1781 stp = &b->st;
1782 /*
1783 * b->st.st_size != 0 if previous fstat() succeeded,
1784 * which is likely, we can avoid extra stat() call.
1785 */
1786 if (b->st.st_size == 0) {
1787 stp = &st;
1788 if (fstat(fd, &st) == -1) {
1789 file_badread(ms);
1790 return -1;
1791 }
1792 }
1793 if (S_ISREG(stp->st_mode) || stp->st_size != 0)
1794 fsize = stp->st_size;
1795 else
1796 fsize = SIZE_UNKNOWN;
1797
1798 clazz = buf[EI_CLASS];
1799
1800 switch (clazz) {
1801 case ELFCLASS32:
1802 #undef elf_getu
1803 #define elf_getu(a, b) elf_getu32(a, b)
1804 #undef elfhdr
1805 #define elfhdr elf32hdr
1806 #include "elfclass.h"
1807 case ELFCLASS64:
1808 #undef elf_getu
1809 #define elf_getu(a, b) elf_getu64(a, b)
1810 #undef elfhdr
1811 #define elfhdr elf64hdr
1812 #include "elfclass.h"
1813 default:
1814 if (file_printf(ms, ", unknown class %d", clazz) == -1)
1815 return -1;
1816 break;
1817 }
1818 return 0;
1819 }
1820 #endif
DragonFly BSD