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 1.144 2018/07/08 23:37:33 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
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) == -1)
71 return -1;
72 return 0;
73 }
74
75 private uint16_t
getu16(int swap,uint16_t value)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
getu32(int swap,uint32_t value)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
getu64(int swap,uint64_t value)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 2.0.36 (short name) */
266
267 8, /* FreeBSD */
268 };
269
270 static const size_t prpsoffsets64[] = {
271 #ifdef USE_NT_PSINFO
272 152, /* SunOS 5.x (command line) */
273 136, /* SunOS 5.x (short name) */
274 #endif /* USE_NT_PSINFO */
275
276 136, /* SunOS 5.x, 64-bit (command line) */
277 120, /* SunOS 5.x, 64-bit (short name) */
278
279 56, /* Linux (command line) */
280 40, /* Linux (tested on core from 2.4.x, short name) */
281
282 16, /* FreeBSD, 64-bit */
283 };
284
285 #define NOFFSETS32 (sizeof(prpsoffsets32) / sizeof(prpsoffsets32[0]))
286 #define NOFFSETS64 (sizeof(prpsoffsets64) / sizeof(prpsoffsets64[0]))
287
288 #define NOFFSETS (clazz == ELFCLASS32 ? NOFFSETS32 : NOFFSETS64)
289
290 /*
291 * Look through the program headers of an executable image, searching
292 * for a PT_NOTE section of type NT_PRPSINFO, with a name "CORE" or
293 * "FreeBSD"; if one is found, try looking in various places in its
294 * contents for a 16-character string containing only printable
295 * characters - if found, that string should be the name of the program
296 * that dropped core. Note: right after that 16-character string is,
297 * at least in SunOS 5.x (and possibly other SVR4-flavored systems) and
298 * Linux, a longer string (80 characters, in 5.x, probably other
299 * SVR4-flavored systems, and Linux) containing the start of the
300 * command line for that program.
301 *
302 * SunOS 5.x core files contain two PT_NOTE sections, with the types
303 * NT_PRPSINFO (old) and NT_PSINFO (new). These structs contain the
304 * same info about the command name and command line, so it probably
305 * isn't worthwhile to look for NT_PSINFO, but the offsets are provided
306 * above (see USE_NT_PSINFO), in case we ever decide to do so. The
307 * NT_PRPSINFO and NT_PSINFO sections are always in order and adjacent;
308 * the SunOS 5.x file command relies on this (and prefers the latter).
309 *
310 * The signal number probably appears in a section of type NT_PRSTATUS,
311 * but that's also rather OS-dependent, in ways that are harder to
312 * dissect with heuristics, so I'm not bothering with the signal number.
313 * (I suppose the signal number could be of interest in situations where
314 * you don't have the binary of the program that dropped core; if you
315 * *do* have that binary, the debugger will probably tell you what
316 * signal it was.)
317 */
318
319 #define OS_STYLE_SVR4 0
320 #define OS_STYLE_FREEBSD 1
321 #define OS_STYLE_NETBSD 2
322
323 private const char os_style_names[][8] = {
324 "SVR4",
325 "FreeBSD",
326 "NetBSD",
327 };
328
329 #define FLAGS_CORE_STYLE 0x0003
330
331 #define FLAGS_DID_CORE 0x0004
332 #define FLAGS_DID_OS_NOTE 0x0008
333 #define FLAGS_DID_BUILD_ID 0x0010
334 #define FLAGS_DID_CORE_STYLE 0x0020
335 #define FLAGS_DID_NETBSD_PAX 0x0040
336 #define FLAGS_DID_NETBSD_MARCH 0x0080
337 #define FLAGS_DID_NETBSD_CMODEL 0x0100
338 #define FLAGS_DID_NETBSD_EMULATION 0x0200
339 #define FLAGS_DID_NETBSD_UNKNOWN 0x0400
340 #define FLAGS_IS_CORE 0x0800
341 #define FLAGS_DID_AUXV 0x1000
342
343 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)344 dophn_core(struct magic_set *ms, int clazz, int swap, int fd, off_t off,
345 int num, size_t size, off_t fsize, int *flags, uint16_t *notecount)
346 {
347 Elf32_Phdr ph32;
348 Elf64_Phdr ph64;
349 size_t offset, len;
350 unsigned char nbuf[BUFSIZ];
351 ssize_t bufsize;
352 off_t ph_off = off;
353 int ph_num = num;
354
355 if (size != xph_sizeof) {
356 if (file_printf(ms, ", corrupted program header size") == -1)
357 return -1;
358 return 0;
359 }
360
361 /*
362 * Loop through all the program headers.
363 */
364 for ( ; num; num--) {
365 if (pread(fd, xph_addr, xph_sizeof, off) <
366 CAST(ssize_t, xph_sizeof)) {
367 file_badread(ms);
368 return -1;
369 }
370 off += size;
371
372 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) {
373 /* Perhaps warn here */
374 continue;
375 }
376
377 if (xph_type != PT_NOTE)
378 continue;
379
380 /*
381 * This is a PT_NOTE section; loop through all the notes
382 * in the section.
383 */
384 len = xph_filesz < sizeof(nbuf) ? xph_filesz : sizeof(nbuf);
385 if ((bufsize = pread(fd, nbuf, len, xph_offset)) == -1) {
386 file_badread(ms);
387 return -1;
388 }
389 offset = 0;
390 for (;;) {
391 if (offset >= (size_t)bufsize)
392 break;
393 offset = donote(ms, nbuf, offset, (size_t)bufsize,
394 clazz, swap, 4, flags, notecount, fd, ph_off,
395 ph_num, fsize);
396 if (offset == 0)
397 break;
398
399 }
400 }
401 return 0;
402 }
403 #endif
404
405 static void
do_note_netbsd_version(struct magic_set * ms,int swap,void * v)406 do_note_netbsd_version(struct magic_set *ms, int swap, void *v)
407 {
408 uint32_t desc;
409 memcpy(&desc, v, sizeof(desc));
410 desc = elf_getu32(swap, desc);
411
412 if (file_printf(ms, ", for NetBSD") == -1)
413 return;
414 /*
415 * The version number used to be stuck as 199905, and was thus
416 * basically content-free. Newer versions of NetBSD have fixed
417 * this and now use the encoding of __NetBSD_Version__:
418 *
419 * MMmmrrpp00
420 *
421 * M = major version
422 * m = minor version
423 * r = release ["",A-Z,Z[A-Z] but numeric]
424 * p = patchlevel
425 */
426 if (desc > 100000000U) {
427 uint32_t ver_patch = (desc / 100) % 100;
428 uint32_t ver_rel = (desc / 10000) % 100;
429 uint32_t ver_min = (desc / 1000000) % 100;
430 uint32_t ver_maj = desc / 100000000;
431
432 if (file_printf(ms, " %u.%u", ver_maj, ver_min) == -1)
433 return;
434 if (ver_rel == 0 && ver_patch != 0) {
435 if (file_printf(ms, ".%u", ver_patch) == -1)
436 return;
437 } else if (ver_rel != 0) {
438 while (ver_rel > 26) {
439 if (file_printf(ms, "Z") == -1)
440 return;
441 ver_rel -= 26;
442 }
443 if (file_printf(ms, "%c", 'A' + ver_rel - 1)
444 == -1)
445 return;
446 }
447 }
448 }
449
450 static void
do_note_freebsd_version(struct magic_set * ms,int swap,void * v)451 do_note_freebsd_version(struct magic_set *ms, int swap, void *v)
452 {
453 uint32_t desc;
454
455 memcpy(&desc, v, sizeof(desc));
456 desc = elf_getu32(swap, desc);
457 if (file_printf(ms, ", for FreeBSD") == -1)
458 return;
459
460 /*
461 * Contents is __FreeBSD_version, whose relation to OS
462 * versions is defined by a huge table in the Porter's
463 * Handbook. This is the general scheme:
464 *
465 * Releases:
466 * Mmp000 (before 4.10)
467 * Mmi0p0 (before 5.0)
468 * Mmm0p0
469 *
470 * Development branches:
471 * Mmpxxx (before 4.6)
472 * Mmp1xx (before 4.10)
473 * Mmi1xx (before 5.0)
474 * M000xx (pre-M.0)
475 * Mmm1xx
476 *
477 * M = major version
478 * m = minor version
479 * i = minor version increment (491000 -> 4.10)
480 * p = patchlevel
481 * x = revision
482 *
483 * The first release of FreeBSD to use ELF by default
484 * was version 3.0.
485 */
486 if (desc == 460002) {
487 if (file_printf(ms, " 4.6.2") == -1)
488 return;
489 } else if (desc < 460100) {
490 if (file_printf(ms, " %d.%d", desc / 100000,
491 desc / 10000 % 10) == -1)
492 return;
493 if (desc / 1000 % 10 > 0)
494 if (file_printf(ms, ".%d", desc / 1000 % 10) == -1)
495 return;
496 if ((desc % 1000 > 0) || (desc % 100000 == 0))
497 if (file_printf(ms, " (%d)", desc) == -1)
498 return;
499 } else if (desc < 500000) {
500 if (file_printf(ms, " %d.%d", desc / 100000,
501 desc / 10000 % 10 + desc / 1000 % 10) == -1)
502 return;
503 if (desc / 100 % 10 > 0) {
504 if (file_printf(ms, " (%d)", desc) == -1)
505 return;
506 } else if (desc / 10 % 10 > 0) {
507 if (file_printf(ms, ".%d", desc / 10 % 10) == -1)
508 return;
509 }
510 } else {
511 if (file_printf(ms, " %d.%d", desc / 100000,
512 desc / 1000 % 100) == -1)
513 return;
514 if ((desc / 100 % 10 > 0) ||
515 (desc % 100000 / 100 == 0)) {
516 if (file_printf(ms, " (%d)", desc) == -1)
517 return;
518 } else if (desc / 10 % 10 > 0) {
519 if (file_printf(ms, ".%d", desc / 10 % 10) == -1)
520 return;
521 }
522 }
523 }
524
525 private int
526 /*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)527 do_bid_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type,
528 int swap __attribute__((__unused__)), uint32_t namesz, uint32_t descsz,
529 size_t noff, size_t doff, int *flags)
530 {
531 if (namesz == 4 && strcmp((char *)&nbuf[noff], "GNU") == 0 &&
532 type == NT_GNU_BUILD_ID && (descsz >= 4 && descsz <= 20)) {
533 uint8_t desc[20];
534 const char *btype;
535 uint32_t i;
536 *flags |= FLAGS_DID_BUILD_ID;
537 switch (descsz) {
538 case 8:
539 btype = "xxHash";
540 break;
541 case 16:
542 btype = "md5/uuid";
543 break;
544 case 20:
545 btype = "sha1";
546 break;
547 default:
548 btype = "unknown";
549 break;
550 }
551 if (file_printf(ms, ", BuildID[%s]=", btype) == -1)
552 return 1;
553 memcpy(desc, &nbuf[doff], descsz);
554 for (i = 0; i < descsz; i++)
555 if (file_printf(ms, "%02x", desc[i]) == -1)
556 return 1;
557 return 1;
558 }
559 if (namesz == 4 && strcmp((char *)&nbuf[noff], "Go") == 0 &&
560 type == NT_GO_BUILD_ID && descsz < 128) {
561 if (file_printf(ms, ", Go BuildID=%s",
562 (char *)&nbuf[doff]) == -1)
563 return 1;
564 return 1;
565 }
566 return 0;
567 }
568
569 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)570 do_os_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type,
571 int swap, uint32_t namesz, uint32_t descsz,
572 size_t noff, size_t doff, int *flags)
573 {
574 if (namesz == 5 && strcmp((char *)&nbuf[noff], "SuSE") == 0 &&
575 type == NT_GNU_VERSION && descsz == 2) {
576 *flags |= FLAGS_DID_OS_NOTE;
577 file_printf(ms, ", for SuSE %d.%d", nbuf[doff], nbuf[doff + 1]);
578 return 1;
579 }
580
581 if (namesz == 4 && strcmp((char *)&nbuf[noff], "GNU") == 0 &&
582 type == NT_GNU_VERSION && descsz == 16) {
583 uint32_t desc[4];
584 memcpy(desc, &nbuf[doff], sizeof(desc));
585
586 *flags |= FLAGS_DID_OS_NOTE;
587 if (file_printf(ms, ", for GNU/") == -1)
588 return 1;
589 switch (elf_getu32(swap, desc[0])) {
590 case GNU_OS_LINUX:
591 if (file_printf(ms, "Linux") == -1)
592 return 1;
593 break;
594 case GNU_OS_HURD:
595 if (file_printf(ms, "Hurd") == -1)
596 return 1;
597 break;
598 case GNU_OS_SOLARIS:
599 if (file_printf(ms, "Solaris") == -1)
600 return 1;
601 break;
602 case GNU_OS_KFREEBSD:
603 if (file_printf(ms, "kFreeBSD") == -1)
604 return 1;
605 break;
606 case GNU_OS_KNETBSD:
607 if (file_printf(ms, "kNetBSD") == -1)
608 return 1;
609 break;
610 default:
611 if (file_printf(ms, "<unknown>") == -1)
612 return 1;
613 }
614 if (file_printf(ms, " %d.%d.%d", elf_getu32(swap, desc[1]),
615 elf_getu32(swap, desc[2]), elf_getu32(swap, desc[3])) == -1)
616 return 1;
617 return 1;
618 }
619
620 if (namesz == 7 && strcmp((char *)&nbuf[noff], "NetBSD") == 0) {
621 if (type == NT_NETBSD_VERSION && descsz == 4) {
622 *flags |= FLAGS_DID_OS_NOTE;
623 do_note_netbsd_version(ms, swap, &nbuf[doff]);
624 return 1;
625 }
626 }
627
628 if (namesz == 8 && strcmp((char *)&nbuf[noff], "FreeBSD") == 0) {
629 if (type == NT_FREEBSD_VERSION && descsz == 4) {
630 *flags |= FLAGS_DID_OS_NOTE;
631 do_note_freebsd_version(ms, swap, &nbuf[doff]);
632 return 1;
633 }
634 }
635
636 if (namesz == 8 && strcmp((char *)&nbuf[noff], "OpenBSD") == 0 &&
637 type == NT_OPENBSD_VERSION && descsz == 4) {
638 *flags |= FLAGS_DID_OS_NOTE;
639 if (file_printf(ms, ", for OpenBSD") == -1)
640 return 1;
641 /* Content of note is always 0 */
642 return 1;
643 }
644
645 if (namesz == 10 && strcmp((char *)&nbuf[noff], "DragonFly") == 0 &&
646 type == NT_DRAGONFLY_VERSION && descsz == 4) {
647 uint32_t desc;
648 *flags |= FLAGS_DID_OS_NOTE;
649 if (file_printf(ms, ", for DragonFly") == -1)
650 return 1;
651 memcpy(&desc, &nbuf[doff], sizeof(desc));
652 desc = elf_getu32(swap, desc);
653 if (file_printf(ms, " %d.%d.%d", desc / 100000,
654 desc / 10000 % 10, desc % 10000) == -1)
655 return 1;
656 return 1;
657 }
658 return 0;
659 }
660
661 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)662 do_pax_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type,
663 int swap, uint32_t namesz, uint32_t descsz,
664 size_t noff, size_t doff, int *flags)
665 {
666 if (namesz == 4 && strcmp((char *)&nbuf[noff], "PaX") == 0 &&
667 type == NT_NETBSD_PAX && descsz == 4) {
668 static const char *pax[] = {
669 "+mprotect",
670 "-mprotect",
671 "+segvguard",
672 "-segvguard",
673 "+ASLR",
674 "-ASLR",
675 };
676 uint32_t desc;
677 size_t i;
678 int did = 0;
679
680 *flags |= FLAGS_DID_NETBSD_PAX;
681 memcpy(&desc, &nbuf[doff], sizeof(desc));
682 desc = elf_getu32(swap, desc);
683
684 if (desc && file_printf(ms, ", PaX: ") == -1)
685 return 1;
686
687 for (i = 0; i < __arraycount(pax); i++) {
688 if (((1 << (int)i) & desc) == 0)
689 continue;
690 if (file_printf(ms, "%s%s", did++ ? "," : "",
691 pax[i]) == -1)
692 return 1;
693 }
694 return 1;
695 }
696 return 0;
697 }
698
699 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)700 do_core_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type,
701 int swap, uint32_t namesz, uint32_t descsz,
702 size_t noff, size_t doff, int *flags, size_t size, int clazz)
703 {
704 #ifdef ELFCORE
705 int os_style = -1;
706 /*
707 * Sigh. The 2.0.36 kernel in Debian 2.1, at
708 * least, doesn't correctly implement name
709 * sections, in core dumps, as specified by
710 * the "Program Linking" section of "UNIX(R) System
711 * V Release 4 Programmer's Guide: ANSI C and
712 * Programming Support Tools", because my copy
713 * clearly says "The first 'namesz' bytes in 'name'
714 * contain a *null-terminated* [emphasis mine]
715 * character representation of the entry's owner
716 * or originator", but the 2.0.36 kernel code
717 * doesn't include the terminating null in the
718 * name....
719 */
720 if ((namesz == 4 && strncmp((char *)&nbuf[noff], "CORE", 4) == 0) ||
721 (namesz == 5 && strcmp((char *)&nbuf[noff], "CORE") == 0)) {
722 os_style = OS_STYLE_SVR4;
723 }
724
725 if ((namesz == 8 && strcmp((char *)&nbuf[noff], "FreeBSD") == 0)) {
726 os_style = OS_STYLE_FREEBSD;
727 }
728
729 if ((namesz >= 11 && strncmp((char *)&nbuf[noff], "NetBSD-CORE", 11)
730 == 0)) {
731 os_style = OS_STYLE_NETBSD;
732 }
733
734 if (os_style != -1 && (*flags & FLAGS_DID_CORE_STYLE) == 0) {
735 if (file_printf(ms, ", %s-style", os_style_names[os_style])
736 == -1)
737 return 1;
738 *flags |= FLAGS_DID_CORE_STYLE;
739 *flags |= os_style;
740 }
741
742 switch (os_style) {
743 case OS_STYLE_NETBSD:
744 if (type == NT_NETBSD_CORE_PROCINFO) {
745 char sbuf[512];
746 struct NetBSD_elfcore_procinfo pi;
747 memset(&pi, 0, sizeof(pi));
748 memcpy(&pi, nbuf + doff, descsz);
749
750 if (file_printf(ms, ", from '%.31s', pid=%u, uid=%u, "
751 "gid=%u, nlwps=%u, lwp=%u (signal %u/code %u)",
752 file_printable(sbuf, sizeof(sbuf),
753 CAST(char *, pi.cpi_name)),
754 elf_getu32(swap, (uint32_t)pi.cpi_pid),
755 elf_getu32(swap, pi.cpi_euid),
756 elf_getu32(swap, pi.cpi_egid),
757 elf_getu32(swap, pi.cpi_nlwps),
758 elf_getu32(swap, (uint32_t)pi.cpi_siglwp),
759 elf_getu32(swap, pi.cpi_signo),
760 elf_getu32(swap, pi.cpi_sigcode)) == -1)
761 return 1;
762
763 *flags |= FLAGS_DID_CORE;
764 return 1;
765 }
766 break;
767
768 default:
769 if (type == NT_PRPSINFO && *flags & FLAGS_IS_CORE) {
770 size_t i, j;
771 unsigned char c;
772 /*
773 * Extract the program name. We assume
774 * it to be 16 characters (that's what it
775 * is in SunOS 5.x and Linux).
776 *
777 * Unfortunately, it's at a different offset
778 * in various OSes, so try multiple offsets.
779 * If the characters aren't all printable,
780 * reject it.
781 */
782 for (i = 0; i < NOFFSETS; i++) {
783 unsigned char *cname, *cp;
784 size_t reloffset = prpsoffsets(i);
785 size_t noffset = doff + reloffset;
786 size_t k;
787 for (j = 0; j < 16; j++, noffset++,
788 reloffset++) {
789 /*
790 * Make sure we're not past
791 * the end of the buffer; if
792 * we are, just give up.
793 */
794 if (noffset >= size)
795 goto tryanother;
796
797 /*
798 * Make sure we're not past
799 * the end of the contents;
800 * if we are, this obviously
801 * isn't the right offset.
802 */
803 if (reloffset >= descsz)
804 goto tryanother;
805
806 c = nbuf[noffset];
807 if (c == '\0') {
808 /*
809 * A '\0' at the
810 * beginning is
811 * obviously wrong.
812 * Any other '\0'
813 * means we're done.
814 */
815 if (j == 0)
816 goto tryanother;
817 else
818 break;
819 } else {
820 /*
821 * A nonprintable
822 * character is also
823 * wrong.
824 */
825 if (!isprint(c) || isquote(c))
826 goto tryanother;
827 }
828 }
829 /*
830 * Well, that worked.
831 */
832
833 /*
834 * Try next offsets, in case this match is
835 * in the middle of a string.
836 */
837 for (k = i + 1 ; k < NOFFSETS; k++) {
838 size_t no;
839 int adjust = 1;
840 if (prpsoffsets(k) >= prpsoffsets(i))
841 continue;
842 for (no = doff + prpsoffsets(k);
843 no < doff + prpsoffsets(i); no++)
844 adjust = adjust
845 && isprint(nbuf[no]);
846 if (adjust)
847 i = k;
848 }
849
850 cname = (unsigned char *)
851 &nbuf[doff + prpsoffsets(i)];
852 for (cp = cname; cp < nbuf + size && *cp
853 && isprint(*cp); cp++)
854 continue;
855 /*
856 * Linux apparently appends a space at the end
857 * of the command line: remove it.
858 */
859 while (cp > cname && isspace(cp[-1]))
860 cp--;
861 if (file_printf(ms, ", from '%.*s'",
862 (int)(cp - cname), cname) == -1)
863 return 1;
864 *flags |= FLAGS_DID_CORE;
865 return 1;
866
867 tryanother:
868 ;
869 }
870 }
871 break;
872 }
873 #endif
874 return 0;
875 }
876
877 private off_t
get_offset_from_virtaddr(struct magic_set * ms,int swap,int clazz,int fd,off_t off,int num,off_t fsize,uint64_t virtaddr)878 get_offset_from_virtaddr(struct magic_set *ms, int swap, int clazz, int fd,
879 off_t off, int num, off_t fsize, uint64_t virtaddr)
880 {
881 Elf32_Phdr ph32;
882 Elf64_Phdr ph64;
883
884 /*
885 * Loop through all the program headers and find the header with
886 * virtual address in which the "virtaddr" belongs to.
887 */
888 for ( ; num; num--) {
889 if (pread(fd, xph_addr, xph_sizeof, off) < (ssize_t)xph_sizeof) {
890 file_badread(ms);
891 return -1;
892 }
893 off += xph_sizeof;
894
895 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) {
896 /* Perhaps warn here */
897 continue;
898 }
899
900 if (virtaddr >= xph_vaddr && virtaddr < xph_vaddr + xph_filesz)
901 return xph_offset + (virtaddr - xph_vaddr);
902 }
903 return 0;
904 }
905
906 private size_t
get_string_on_virtaddr(struct magic_set * ms,int swap,int clazz,int fd,off_t ph_off,int ph_num,off_t fsize,uint64_t virtaddr,char * buf,ssize_t buflen)907 get_string_on_virtaddr(struct magic_set *ms,
908 int swap, int clazz, int fd, off_t ph_off, int ph_num,
909 off_t fsize, uint64_t virtaddr, char *buf, ssize_t buflen)
910 {
911 char *bptr;
912 off_t offset;
913
914 if (buflen == 0)
915 return 0;
916
917 offset = get_offset_from_virtaddr(ms, swap, clazz, fd, ph_off, ph_num,
918 fsize, virtaddr);
919 if ((buflen = pread(fd, buf, CAST(size_t, buflen), offset)) <= 0) {
920 file_badread(ms);
921 return 0;
922 }
923
924 buf[buflen - 1] = '\0';
925
926 /* We expect only printable characters, so return if buffer contains
927 * non-printable character before the '\0' or just '\0'. */
928 for (bptr = buf; *bptr && isprint((unsigned char)*bptr); bptr++)
929 continue;
930 if (*bptr != '\0')
931 return 0;
932
933 return bptr - buf;
934 }
935
936
937 /*ARGSUSED*/
938 private int
do_auxv_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,int fd,off_t ph_off,int ph_num,off_t fsize)939 do_auxv_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type,
940 int swap, uint32_t namesz __attribute__((__unused__)),
941 uint32_t descsz __attribute__((__unused__)),
942 size_t noff __attribute__((__unused__)), size_t doff,
943 int *flags, size_t size __attribute__((__unused__)), int clazz,
944 int fd, off_t ph_off, int ph_num, off_t fsize)
945 {
946 #ifdef ELFCORE
947 Aux32Info auxv32;
948 Aux64Info auxv64;
949 size_t elsize = xauxv_sizeof;
950 const char *tag;
951 int is_string;
952 size_t nval;
953
954 if ((*flags & (FLAGS_IS_CORE|FLAGS_DID_CORE_STYLE)) !=
955 (FLAGS_IS_CORE|FLAGS_DID_CORE_STYLE))
956 return 0;
957
958 switch (*flags & FLAGS_CORE_STYLE) {
959 case OS_STYLE_SVR4:
960 if (type != NT_AUXV)
961 return 0;
962 break;
963 #ifdef notyet
964 case OS_STYLE_NETBSD:
965 if (type != NT_NETBSD_CORE_AUXV)
966 return 0;
967 break;
968 case OS_STYLE_FREEBSD:
969 if (type != NT_FREEBSD_PROCSTAT_AUXV)
970 return 0;
971 break;
972 #endif
973 default:
974 return 0;
975 }
976
977 *flags |= FLAGS_DID_AUXV;
978
979 nval = 0;
980 for (size_t off = 0; off + elsize <= descsz; off += elsize) {
981 memcpy(xauxv_addr, &nbuf[doff + off], xauxv_sizeof);
982 /* Limit processing to 50 vector entries to prevent DoS */
983 if (nval++ >= 50) {
984 file_error(ms, 0, "Too many ELF Auxv elements");
985 return 1;
986 }
987
988 switch(xauxv_type) {
989 case AT_LINUX_EXECFN:
990 is_string = 1;
991 tag = "execfn";
992 break;
993 case AT_LINUX_PLATFORM:
994 is_string = 1;
995 tag = "platform";
996 break;
997 case AT_LINUX_UID:
998 is_string = 0;
999 tag = "real uid";
1000 break;
1001 case AT_LINUX_GID:
1002 is_string = 0;
1003 tag = "real gid";
1004 break;
1005 case AT_LINUX_EUID:
1006 is_string = 0;
1007 tag = "effective uid";
1008 break;
1009 case AT_LINUX_EGID:
1010 is_string = 0;
1011 tag = "effective gid";
1012 break;
1013 default:
1014 is_string = 0;
1015 tag = NULL;
1016 break;
1017 }
1018
1019 if (tag == NULL)
1020 continue;
1021
1022 if (is_string) {
1023 char buf[256];
1024 ssize_t buflen;
1025 buflen = get_string_on_virtaddr(ms, swap, clazz, fd,
1026 ph_off, ph_num, fsize, xauxv_val, buf, sizeof(buf));
1027
1028 if (buflen == 0)
1029 continue;
1030
1031 if (file_printf(ms, ", %s: '%s'", tag, buf) == -1)
1032 return 0;
1033 } else {
1034 if (file_printf(ms, ", %s: %d", tag, (int) xauxv_val)
1035 == -1)
1036 return 0;
1037 }
1038 }
1039 return 1;
1040 #else
1041 return 0;
1042 #endif
1043 }
1044
1045 private size_t
dodynamic(struct magic_set * ms,void * vbuf,size_t offset,size_t size,int clazz,int swap)1046 dodynamic(struct magic_set *ms, void *vbuf, size_t offset, size_t size,
1047 int clazz, int swap)
1048 {
1049 Elf32_Dyn dh32;
1050 Elf64_Dyn dh64;
1051 unsigned char *dbuf = CAST(unsigned char *, vbuf);
1052
1053 if (xdh_sizeof + offset > size) {
1054 /*
1055 * We're out of note headers.
1056 */
1057 return xdh_sizeof + offset;
1058 }
1059
1060 memcpy(xdh_addr, &dbuf[offset], xdh_sizeof);
1061 offset += xdh_sizeof;
1062
1063 switch (xdh_tag) {
1064 case DT_FLAGS_1:
1065 if (xdh_val == DF_1_PIE)
1066 ms->mode |= 0111;
1067 else
1068 ms->mode &= ~0111;
1069 break;
1070 default:
1071 break;
1072 }
1073 return offset;
1074 }
1075
1076
1077 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,int fd,off_t ph_off,int ph_num,off_t fsize)1078 donote(struct magic_set *ms, void *vbuf, size_t offset, size_t size,
1079 int clazz, int swap, size_t align, int *flags, uint16_t *notecount,
1080 int fd, off_t ph_off, int ph_num, off_t fsize)
1081 {
1082 Elf32_Nhdr nh32;
1083 Elf64_Nhdr nh64;
1084 size_t noff, doff;
1085 uint32_t namesz, descsz;
1086 unsigned char *nbuf = CAST(unsigned char *, vbuf);
1087
1088 if (*notecount == 0)
1089 return 0;
1090 --*notecount;
1091
1092 if (xnh_sizeof + offset > size) {
1093 /*
1094 * We're out of note headers.
1095 */
1096 return xnh_sizeof + offset;
1097 }
1098
1099 memcpy(xnh_addr, &nbuf[offset], xnh_sizeof);
1100 offset += xnh_sizeof;
1101
1102 namesz = xnh_namesz;
1103 descsz = xnh_descsz;
1104
1105 if ((namesz == 0) && (descsz == 0)) {
1106 /*
1107 * We're out of note headers.
1108 */
1109 return (offset >= size) ? offset : size;
1110 }
1111
1112 if (namesz & 0x80000000) {
1113 file_printf(ms, ", bad note name size %#lx",
1114 CAST(unsigned long, namesz));
1115 return 0;
1116 }
1117
1118 if (descsz & 0x80000000) {
1119 file_printf(ms, ", bad note description size %#lx",
1120 CAST(unsigned long, descsz));
1121 return 0;
1122 }
1123
1124 noff = offset;
1125 doff = ELF_ALIGN(offset + namesz);
1126
1127 if (offset + namesz > size) {
1128 /*
1129 * We're past the end of the buffer.
1130 */
1131 return doff;
1132 }
1133
1134 offset = ELF_ALIGN(doff + descsz);
1135 if (doff + descsz > size) {
1136 /*
1137 * We're past the end of the buffer.
1138 */
1139 return (offset >= size) ? offset : size;
1140 }
1141
1142
1143 if ((*flags & FLAGS_DID_OS_NOTE) == 0) {
1144 if (do_os_note(ms, nbuf, xnh_type, swap,
1145 namesz, descsz, noff, doff, flags))
1146 return offset;
1147 }
1148
1149 if ((*flags & FLAGS_DID_BUILD_ID) == 0) {
1150 if (do_bid_note(ms, nbuf, xnh_type, swap,
1151 namesz, descsz, noff, doff, flags))
1152 return offset;
1153 }
1154
1155 if ((*flags & FLAGS_DID_NETBSD_PAX) == 0) {
1156 if (do_pax_note(ms, nbuf, xnh_type, swap,
1157 namesz, descsz, noff, doff, flags))
1158 return offset;
1159 }
1160
1161 if ((*flags & FLAGS_DID_CORE) == 0) {
1162 if (do_core_note(ms, nbuf, xnh_type, swap,
1163 namesz, descsz, noff, doff, flags, size, clazz))
1164 return offset;
1165 }
1166
1167 if ((*flags & FLAGS_DID_AUXV) == 0) {
1168 if (do_auxv_note(ms, nbuf, xnh_type, swap,
1169 namesz, descsz, noff, doff, flags, size, clazz,
1170 fd, ph_off, ph_num, fsize))
1171 return offset;
1172 }
1173
1174 if (namesz == 7 && strcmp(CAST(char *, &nbuf[noff]), "NetBSD") == 0) {
1175 int descw, flag;
1176 const char *str, *tag;
1177 if (descsz > 100)
1178 descsz = 100;
1179 switch (xnh_type) {
1180 case NT_NETBSD_VERSION:
1181 return offset;
1182 case NT_NETBSD_MARCH:
1183 flag = FLAGS_DID_NETBSD_MARCH;
1184 tag = "compiled for";
1185 break;
1186 case NT_NETBSD_CMODEL:
1187 flag = FLAGS_DID_NETBSD_CMODEL;
1188 tag = "compiler model";
1189 break;
1190 case NT_NETBSD_EMULATION:
1191 flag = FLAGS_DID_NETBSD_EMULATION;
1192 tag = "emulation:";
1193 break;
1194 default:
1195 if (*flags & FLAGS_DID_NETBSD_UNKNOWN)
1196 return offset;
1197 *flags |= FLAGS_DID_NETBSD_UNKNOWN;
1198 if (file_printf(ms, ", note=%u", xnh_type) == -1)
1199 return offset;
1200 return offset;
1201 }
1202
1203 if (*flags & flag)
1204 return offset;
1205 str = CAST(const char *, &nbuf[doff]);
1206 descw = CAST(int, descsz);
1207 *flags |= flag;
1208 file_printf(ms, ", %s: %.*s", tag, descw, str);
1209 return offset;
1210 }
1211
1212 return offset;
1213 }
1214
1215 /* SunOS 5.x hardware capability descriptions */
1216 typedef struct cap_desc {
1217 uint64_t cd_mask;
1218 const char *cd_name;
1219 } cap_desc_t;
1220
1221 static const cap_desc_t cap_desc_sparc[] = {
1222 { AV_SPARC_MUL32, "MUL32" },
1223 { AV_SPARC_DIV32, "DIV32" },
1224 { AV_SPARC_FSMULD, "FSMULD" },
1225 { AV_SPARC_V8PLUS, "V8PLUS" },
1226 { AV_SPARC_POPC, "POPC" },
1227 { AV_SPARC_VIS, "VIS" },
1228 { AV_SPARC_VIS2, "VIS2" },
1229 { AV_SPARC_ASI_BLK_INIT, "ASI_BLK_INIT" },
1230 { AV_SPARC_FMAF, "FMAF" },
1231 { AV_SPARC_FJFMAU, "FJFMAU" },
1232 { AV_SPARC_IMA, "IMA" },
1233 { 0, NULL }
1234 };
1235
1236 static const cap_desc_t cap_desc_386[] = {
1237 { AV_386_FPU, "FPU" },
1238 { AV_386_TSC, "TSC" },
1239 { AV_386_CX8, "CX8" },
1240 { AV_386_SEP, "SEP" },
1241 { AV_386_AMD_SYSC, "AMD_SYSC" },
1242 { AV_386_CMOV, "CMOV" },
1243 { AV_386_MMX, "MMX" },
1244 { AV_386_AMD_MMX, "AMD_MMX" },
1245 { AV_386_AMD_3DNow, "AMD_3DNow" },
1246 { AV_386_AMD_3DNowx, "AMD_3DNowx" },
1247 { AV_386_FXSR, "FXSR" },
1248 { AV_386_SSE, "SSE" },
1249 { AV_386_SSE2, "SSE2" },
1250 { AV_386_PAUSE, "PAUSE" },
1251 { AV_386_SSE3, "SSE3" },
1252 { AV_386_MON, "MON" },
1253 { AV_386_CX16, "CX16" },
1254 { AV_386_AHF, "AHF" },
1255 { AV_386_TSCP, "TSCP" },
1256 { AV_386_AMD_SSE4A, "AMD_SSE4A" },
1257 { AV_386_POPCNT, "POPCNT" },
1258 { AV_386_AMD_LZCNT, "AMD_LZCNT" },
1259 { AV_386_SSSE3, "SSSE3" },
1260 { AV_386_SSE4_1, "SSE4.1" },
1261 { AV_386_SSE4_2, "SSE4.2" },
1262 { 0, NULL }
1263 };
1264
1265 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)1266 doshn(struct magic_set *ms, int clazz, int swap, int fd, off_t off, int num,
1267 size_t size, off_t fsize, int mach, int strtab, int *flags,
1268 uint16_t *notecount)
1269 {
1270 Elf32_Shdr sh32;
1271 Elf64_Shdr sh64;
1272 int stripped = 1, has_debug_info = 0;
1273 size_t nbadcap = 0;
1274 void *nbuf;
1275 off_t noff, coff, name_off;
1276 uint64_t cap_hw1 = 0; /* SunOS 5.x hardware capabilities */
1277 uint64_t cap_sf1 = 0; /* SunOS 5.x software capabilities */
1278 char name[50];
1279 ssize_t namesize;
1280
1281 if (size != xsh_sizeof) {
1282 if (file_printf(ms, ", corrupted section header size") == -1)
1283 return -1;
1284 return 0;
1285 }
1286
1287 /* Read offset of name section to be able to read section names later */
1288 if (pread(fd, xsh_addr, xsh_sizeof, CAST(off_t, (off + size * strtab)))
1289 < CAST(ssize_t, xsh_sizeof)) {
1290 if (file_printf(ms, ", missing section headers") == -1)
1291 return -1;
1292 return 0;
1293 }
1294 name_off = xsh_offset;
1295
1296 for ( ; num; num--) {
1297 /* Read the name of this section. */
1298 if ((namesize = pread(fd, name, sizeof(name) - 1,
1299 name_off + xsh_name)) == -1) {
1300 file_badread(ms);
1301 return -1;
1302 }
1303 name[namesize] = '\0';
1304 if (strcmp(name, ".debug_info") == 0) {
1305 has_debug_info = 1;
1306 stripped = 0;
1307 }
1308
1309 if (pread(fd, xsh_addr, xsh_sizeof, off) <
1310 CAST(ssize_t, xsh_sizeof)) {
1311 file_badread(ms);
1312 return -1;
1313 }
1314 off += size;
1315
1316 /* Things we can determine before we seek */
1317 switch (xsh_type) {
1318 case SHT_SYMTAB:
1319 #if 0
1320 case SHT_DYNSYM:
1321 #endif
1322 stripped = 0;
1323 break;
1324 default:
1325 if (fsize != SIZE_UNKNOWN && xsh_offset > fsize) {
1326 /* Perhaps warn here */
1327 continue;
1328 }
1329 break;
1330 }
1331
1332
1333 /* Things we can determine when we seek */
1334 switch (xsh_type) {
1335 case SHT_NOTE:
1336 if (CAST(uintmax_t, (xsh_size + xsh_offset)) >
1337 CAST(uintmax_t, fsize)) {
1338 if (file_printf(ms,
1339 ", note offset/size %#" INTMAX_T_FORMAT
1340 "x+%#" INTMAX_T_FORMAT "x exceeds"
1341 " file size %#" INTMAX_T_FORMAT "x",
1342 CAST(uintmax_t, xsh_offset),
1343 CAST(uintmax_t, xsh_size),
1344 CAST(uintmax_t, fsize)) == -1)
1345 return -1;
1346 return 0;
1347 }
1348 if ((nbuf = malloc(xsh_size)) == NULL) {
1349 file_error(ms, errno, "Cannot allocate memory"
1350 " for note");
1351 return -1;
1352 }
1353 if (pread(fd, nbuf, xsh_size, xsh_offset) <
1354 CAST(ssize_t, xsh_size)) {
1355 file_badread(ms);
1356 free(nbuf);
1357 return -1;
1358 }
1359
1360 noff = 0;
1361 for (;;) {
1362 if (noff >= CAST(off_t, xsh_size))
1363 break;
1364 noff = donote(ms, nbuf, CAST(size_t, noff),
1365 xsh_size, clazz, swap, 4, flags, notecount,
1366 fd, 0, 0, 0);
1367 if (noff == 0)
1368 break;
1369 }
1370 free(nbuf);
1371 break;
1372 case SHT_SUNW_cap:
1373 switch (mach) {
1374 case EM_SPARC:
1375 case EM_SPARCV9:
1376 case EM_IA_64:
1377 case EM_386:
1378 case EM_AMD64:
1379 break;
1380 default:
1381 goto skip;
1382 }
1383
1384 if (nbadcap > 5)
1385 break;
1386 if (lseek(fd, xsh_offset, SEEK_SET)
1387 == CAST(off_t, -1)) {
1388 file_badseek(ms);
1389 return -1;
1390 }
1391 coff = 0;
1392 for (;;) {
1393 Elf32_Cap cap32;
1394 Elf64_Cap cap64;
1395 char cbuf[/*CONSTCOND*/
1396 MAX(sizeof(cap32), sizeof(cap64))];
1397 if ((coff += xcap_sizeof) >
1398 CAST(off_t, xsh_size))
1399 break;
1400 if (read(fd, cbuf, CAST(size_t, xcap_sizeof)) !=
1401 CAST(ssize_t, xcap_sizeof)) {
1402 file_badread(ms);
1403 return -1;
1404 }
1405 if (cbuf[0] == 'A') {
1406 #ifdef notyet
1407 char *p = cbuf + 1;
1408 uint32_t len, tag;
1409 memcpy(&len, p, sizeof(len));
1410 p += 4;
1411 len = getu32(swap, len);
1412 if (memcmp("gnu", p, 3) != 0) {
1413 if (file_printf(ms,
1414 ", unknown capability %.3s", p)
1415 == -1)
1416 return -1;
1417 break;
1418 }
1419 p += strlen(p) + 1;
1420 tag = *p++;
1421 memcpy(&len, p, sizeof(len));
1422 p += 4;
1423 len = getu32(swap, len);
1424 if (tag != 1) {
1425 if (file_printf(ms, ", unknown gnu"
1426 " capability tag %d", tag)
1427 == -1)
1428 return -1;
1429 break;
1430 }
1431 // gnu attributes
1432 #endif
1433 break;
1434 }
1435 memcpy(xcap_addr, cbuf, xcap_sizeof);
1436 switch (xcap_tag) {
1437 case CA_SUNW_NULL:
1438 break;
1439 case CA_SUNW_HW_1:
1440 cap_hw1 |= xcap_val;
1441 break;
1442 case CA_SUNW_SF_1:
1443 cap_sf1 |= xcap_val;
1444 break;
1445 default:
1446 if (file_printf(ms,
1447 ", with unknown capability "
1448 "%#" INT64_T_FORMAT "x = %#"
1449 INT64_T_FORMAT "x",
1450 CAST(unsigned long long, xcap_tag),
1451 CAST(unsigned long long, xcap_val))
1452 == -1)
1453 return -1;
1454 if (nbadcap++ > 2)
1455 coff = xsh_size;
1456 break;
1457 }
1458 }
1459 /*FALLTHROUGH*/
1460 skip:
1461 default:
1462 break;
1463 }
1464 }
1465
1466 if (has_debug_info) {
1467 if (file_printf(ms, ", with debug_info") == -1)
1468 return -1;
1469 }
1470 if (file_printf(ms, ", %sstripped", stripped ? "" : "not ") == -1)
1471 return -1;
1472 if (cap_hw1) {
1473 const cap_desc_t *cdp;
1474 switch (mach) {
1475 case EM_SPARC:
1476 case EM_SPARC32PLUS:
1477 case EM_SPARCV9:
1478 cdp = cap_desc_sparc;
1479 break;
1480 case EM_386:
1481 case EM_IA_64:
1482 case EM_AMD64:
1483 cdp = cap_desc_386;
1484 break;
1485 default:
1486 cdp = NULL;
1487 break;
1488 }
1489 if (file_printf(ms, ", uses") == -1)
1490 return -1;
1491 if (cdp) {
1492 while (cdp->cd_name) {
1493 if (cap_hw1 & cdp->cd_mask) {
1494 if (file_printf(ms,
1495 " %s", cdp->cd_name) == -1)
1496 return -1;
1497 cap_hw1 &= ~cdp->cd_mask;
1498 }
1499 ++cdp;
1500 }
1501 if (cap_hw1)
1502 if (file_printf(ms,
1503 " unknown hardware capability %#"
1504 INT64_T_FORMAT "x",
1505 CAST(unsigned long long, cap_hw1)) == -1)
1506 return -1;
1507 } else {
1508 if (file_printf(ms,
1509 " hardware capability %#" INT64_T_FORMAT "x",
1510 CAST(unsigned long long, cap_hw1)) == -1)
1511 return -1;
1512 }
1513 }
1514 if (cap_sf1) {
1515 if (cap_sf1 & SF1_SUNW_FPUSED) {
1516 if (file_printf(ms,
1517 (cap_sf1 & SF1_SUNW_FPKNWN)
1518 ? ", uses frame pointer"
1519 : ", not known to use frame pointer") == -1)
1520 return -1;
1521 }
1522 cap_sf1 &= ~SF1_SUNW_MASK;
1523 if (cap_sf1)
1524 if (file_printf(ms,
1525 ", with unknown software capability %#"
1526 INT64_T_FORMAT "x",
1527 CAST(unsigned long long, cap_sf1)) == -1)
1528 return -1;
1529 }
1530 return 0;
1531 }
1532
1533 /*
1534 * Look through the program headers of an executable image, searching
1535 * for a PT_INTERP section; if one is found, it's dynamically linked,
1536 * otherwise it's statically linked.
1537 */
1538 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)1539 dophn_exec(struct magic_set *ms, int clazz, int swap, int fd, off_t off,
1540 int num, size_t size, off_t fsize, int sh_num, int *flags,
1541 uint16_t *notecount)
1542 {
1543 Elf32_Phdr ph32;
1544 Elf64_Phdr ph64;
1545 const char *linking_style = "statically";
1546 unsigned char nbuf[BUFSIZ];
1547 char ibuf[BUFSIZ];
1548 char interp[BUFSIZ];
1549 ssize_t bufsize;
1550 size_t offset, align, len;
1551
1552 if (size != xph_sizeof) {
1553 if (file_printf(ms, ", corrupted program header size") == -1)
1554 return -1;
1555 return 0;
1556 }
1557
1558 interp[0] = '\0';
1559 for ( ; num; num--) {
1560 int doread;
1561 if (pread(fd, xph_addr, xph_sizeof, off) <
1562 CAST(ssize_t, xph_sizeof)) {
1563 file_badread(ms);
1564 return -1;
1565 }
1566
1567 off += size;
1568 bufsize = 0;
1569 align = 4;
1570
1571 /* Things we can determine before we seek */
1572 switch (xph_type) {
1573 case PT_DYNAMIC:
1574 linking_style = "dynamically";
1575 doread = 1;
1576 break;
1577 case PT_NOTE:
1578 if (sh_num) /* Did this through section headers */
1579 continue;
1580 if (((align = xph_align) & 0x80000000UL) != 0 ||
1581 align < 4) {
1582 if (file_printf(ms,
1583 ", invalid note alignment %#lx",
1584 CAST(unsigned long, align)) == -1)
1585 return -1;
1586 align = 4;
1587 }
1588 /*FALLTHROUGH*/
1589 case PT_INTERP:
1590 doread = 1;
1591 break;
1592 default:
1593 doread = 0;
1594 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) {
1595 /* Maybe warn here? */
1596 continue;
1597 }
1598 break;
1599 }
1600
1601 if (doread) {
1602 len = xph_filesz < sizeof(nbuf) ? xph_filesz
1603 : sizeof(nbuf);
1604 bufsize = pread(fd, nbuf, len, xph_offset);
1605 if (bufsize == -1) {
1606 file_badread(ms);
1607 return -1;
1608 }
1609 } else
1610 len = 0;
1611
1612 /* Things we can determine when we seek */
1613 switch (xph_type) {
1614 case PT_DYNAMIC:
1615 offset = 0;
1616 for (;;) {
1617 if (offset >= (size_t)bufsize)
1618 break;
1619 offset = dodynamic(ms, nbuf, offset,
1620 CAST(size_t, bufsize), clazz, swap);
1621 if (offset == 0)
1622 break;
1623 }
1624 break;
1625
1626 case PT_INTERP:
1627 if (bufsize && nbuf[0]) {
1628 nbuf[bufsize - 1] = '\0';
1629 memcpy(interp, nbuf, bufsize);
1630 } else
1631 strlcpy(interp, "*empty*", sizeof(interp));
1632 break;
1633 case PT_NOTE:
1634 /*
1635 * This is a PT_NOTE section; loop through all the notes
1636 * in the section.
1637 */
1638 offset = 0;
1639 for (;;) {
1640 if (offset >= (size_t)bufsize)
1641 break;
1642 offset = donote(ms, nbuf, offset,
1643 CAST(size_t, bufsize), clazz, swap, align,
1644 flags, notecount, fd, 0, 0, 0);
1645 if (offset == 0)
1646 break;
1647 }
1648 break;
1649 default:
1650 break;
1651 }
1652 }
1653 if (file_printf(ms, ", %s linked", linking_style)
1654 == -1)
1655 return -1;
1656 if (interp[0])
1657 if (file_printf(ms, ", interpreter %s",
1658 file_printable(ibuf, sizeof(ibuf), interp)) == -1)
1659 return -1;
1660 return 0;
1661 }
1662
1663
1664 protected int
file_tryelf(struct magic_set * ms,const struct buffer * b)1665 file_tryelf(struct magic_set *ms, const struct buffer *b)
1666 {
1667 int fd = b->fd;
1668 const unsigned char *buf = b->fbuf;
1669 size_t nbytes = b->flen;
1670 union {
1671 int32_t l;
1672 char c[sizeof(int32_t)];
1673 } u;
1674 int clazz;
1675 int swap;
1676 struct stat st;
1677 off_t fsize;
1678 int flags = 0;
1679 Elf32_Ehdr elf32hdr;
1680 Elf64_Ehdr elf64hdr;
1681 uint16_t type, phnum, shnum, notecount;
1682
1683 if (ms->flags & (MAGIC_MIME|MAGIC_APPLE|MAGIC_EXTENSION))
1684 return 0;
1685 /*
1686 * ELF executables have multiple section headers in arbitrary
1687 * file locations and thus file(1) cannot determine it from easily.
1688 * Instead we traverse thru all section headers until a symbol table
1689 * one is found or else the binary is stripped.
1690 * Return immediately if it's not ELF (so we avoid pipe2file unless needed).
1691 */
1692 if (buf[EI_MAG0] != ELFMAG0
1693 || (buf[EI_MAG1] != ELFMAG1 && buf[EI_MAG1] != OLFMAG1)
1694 || buf[EI_MAG2] != ELFMAG2 || buf[EI_MAG3] != ELFMAG3)
1695 return 0;
1696
1697 /*
1698 * If we cannot seek, it must be a pipe, socket or fifo.
1699 */
1700 if((lseek(fd, CAST(off_t, 0), SEEK_SET) == CAST(off_t, -1))
1701 && (errno == ESPIPE))
1702 fd = file_pipe2file(ms, fd, buf, nbytes);
1703
1704 if (fstat(fd, &st) == -1) {
1705 file_badread(ms);
1706 return -1;
1707 }
1708 if (S_ISREG(st.st_mode) || st.st_size != 0)
1709 fsize = st.st_size;
1710 else
1711 fsize = SIZE_UNKNOWN;
1712
1713 clazz = buf[EI_CLASS];
1714
1715 switch (clazz) {
1716 case ELFCLASS32:
1717 #undef elf_getu
1718 #define elf_getu(a, b) elf_getu32(a, b)
1719 #undef elfhdr
1720 #define elfhdr elf32hdr
1721 #include "elfclass.h"
1722 case ELFCLASS64:
1723 #undef elf_getu
1724 #define elf_getu(a, b) elf_getu64(a, b)
1725 #undef elfhdr
1726 #define elfhdr elf64hdr
1727 #include "elfclass.h"
1728 default:
1729 if (file_printf(ms, ", unknown class %d", clazz) == -1)
1730 return -1;
1731 break;
1732 }
1733 return 0;
1734 }
1735 #endif
1736