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 1.173 2020/06/07 22:12:54 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 (ms->flags & MAGIC_MIME)
71 return 1;
72 if (file_printf(ms, ", too many %s (%u)", name, num) == -1)
73 return -1;
74 return 1;
75 }
76
77 private uint16_t
getu16(int swap,uint16_t value)78 getu16(int swap, uint16_t value)
79 {
80 union {
81 uint16_t ui;
82 char c[2];
83 } retval, tmpval;
84
85 if (swap) {
86 tmpval.ui = value;
87
88 retval.c[0] = tmpval.c[1];
89 retval.c[1] = tmpval.c[0];
90
91 return retval.ui;
92 } else
93 return value;
94 }
95
96 private uint32_t
getu32(int swap,uint32_t value)97 getu32(int swap, uint32_t value)
98 {
99 union {
100 uint32_t ui;
101 char c[4];
102 } retval, tmpval;
103
104 if (swap) {
105 tmpval.ui = value;
106
107 retval.c[0] = tmpval.c[3];
108 retval.c[1] = tmpval.c[2];
109 retval.c[2] = tmpval.c[1];
110 retval.c[3] = tmpval.c[0];
111
112 return retval.ui;
113 } else
114 return value;
115 }
116
117 private uint64_t
getu64(int swap,uint64_t value)118 getu64(int swap, uint64_t value)
119 {
120 union {
121 uint64_t ui;
122 char c[8];
123 } retval, tmpval;
124
125 if (swap) {
126 tmpval.ui = value;
127
128 retval.c[0] = tmpval.c[7];
129 retval.c[1] = tmpval.c[6];
130 retval.c[2] = tmpval.c[5];
131 retval.c[3] = tmpval.c[4];
132 retval.c[4] = tmpval.c[3];
133 retval.c[5] = tmpval.c[2];
134 retval.c[6] = tmpval.c[1];
135 retval.c[7] = tmpval.c[0];
136
137 return retval.ui;
138 } else
139 return value;
140 }
141
142 #define elf_getu16(swap, value) getu16(swap, value)
143 #define elf_getu32(swap, value) getu32(swap, value)
144 #define elf_getu64(swap, value) getu64(swap, value)
145
146 #define xsh_addr (clazz == ELFCLASS32 \
147 ? CAST(void *, &sh32) \
148 : CAST(void *, &sh64))
149 #define xsh_sizeof (clazz == ELFCLASS32 \
150 ? sizeof(sh32) \
151 : sizeof(sh64))
152 #define xsh_size CAST(size_t, (clazz == ELFCLASS32 \
153 ? elf_getu32(swap, sh32.sh_size) \
154 : elf_getu64(swap, sh64.sh_size)))
155 #define xsh_offset CAST(off_t, (clazz == ELFCLASS32 \
156 ? elf_getu32(swap, sh32.sh_offset) \
157 : elf_getu64(swap, sh64.sh_offset)))
158 #define xsh_type (clazz == ELFCLASS32 \
159 ? elf_getu32(swap, sh32.sh_type) \
160 : elf_getu32(swap, sh64.sh_type))
161 #define xsh_name (clazz == ELFCLASS32 \
162 ? elf_getu32(swap, sh32.sh_name) \
163 : elf_getu32(swap, sh64.sh_name))
164
165 #define xph_addr (clazz == ELFCLASS32 \
166 ? CAST(void *, &ph32) \
167 : CAST(void *, &ph64))
168 #define xph_sizeof (clazz == ELFCLASS32 \
169 ? sizeof(ph32) \
170 : sizeof(ph64))
171 #define xph_type (clazz == ELFCLASS32 \
172 ? elf_getu32(swap, ph32.p_type) \
173 : elf_getu32(swap, ph64.p_type))
174 #define xph_offset CAST(off_t, (clazz == ELFCLASS32 \
175 ? elf_getu32(swap, ph32.p_offset) \
176 : elf_getu64(swap, ph64.p_offset)))
177 #define xph_align CAST(size_t, (clazz == ELFCLASS32 \
178 ? CAST(off_t, (ph32.p_align ? \
179 elf_getu32(swap, ph32.p_align) : 4))\
180 : CAST(off_t, (ph64.p_align ? \
181 elf_getu64(swap, ph64.p_align) : 4))))
182 #define xph_vaddr CAST(size_t, (clazz == ELFCLASS32 \
183 ? CAST(off_t, (ph32.p_vaddr ? \
184 elf_getu32(swap, ph32.p_vaddr) : 4))\
185 : CAST(off_t, (ph64.p_vaddr ? \
186 elf_getu64(swap, ph64.p_vaddr) : 4))))
187 #define xph_filesz CAST(size_t, (clazz == ELFCLASS32 \
188 ? elf_getu32(swap, ph32.p_filesz) \
189 : elf_getu64(swap, ph64.p_filesz)))
190 #define xph_memsz CAST(size_t, ((clazz == ELFCLASS32 \
191 ? elf_getu32(swap, ph32.p_memsz) \
192 : elf_getu64(swap, ph64.p_memsz))))
193 #define xnh_addr (clazz == ELFCLASS32 \
194 ? CAST(void *, &nh32) \
195 : CAST(void *, &nh64))
196 #define xnh_sizeof (clazz == ELFCLASS32 \
197 ? sizeof(nh32) \
198 : sizeof(nh64))
199 #define xnh_type (clazz == ELFCLASS32 \
200 ? elf_getu32(swap, nh32.n_type) \
201 : elf_getu32(swap, nh64.n_type))
202 #define xnh_namesz (clazz == ELFCLASS32 \
203 ? elf_getu32(swap, nh32.n_namesz) \
204 : elf_getu32(swap, nh64.n_namesz))
205 #define xnh_descsz (clazz == ELFCLASS32 \
206 ? elf_getu32(swap, nh32.n_descsz) \
207 : elf_getu32(swap, nh64.n_descsz))
208
209 #define xdh_addr (clazz == ELFCLASS32 \
210 ? CAST(void *, &dh32) \
211 : CAST(void *, &dh64))
212 #define xdh_sizeof (clazz == ELFCLASS32 \
213 ? sizeof(dh32) \
214 : sizeof(dh64))
215 #define xdh_tag (clazz == ELFCLASS32 \
216 ? elf_getu32(swap, dh32.d_tag) \
217 : elf_getu64(swap, dh64.d_tag))
218 #define xdh_val (clazz == ELFCLASS32 \
219 ? elf_getu32(swap, dh32.d_un.d_val) \
220 : elf_getu64(swap, dh64.d_un.d_val))
221
222 #define xcap_addr (clazz == ELFCLASS32 \
223 ? CAST(void *, &cap32) \
224 : CAST(void *, &cap64))
225 #define xcap_sizeof (clazz == ELFCLASS32 \
226 ? sizeof(cap32) \
227 : sizeof(cap64))
228 #define xcap_tag (clazz == ELFCLASS32 \
229 ? elf_getu32(swap, cap32.c_tag) \
230 : elf_getu64(swap, cap64.c_tag))
231 #define xcap_val (clazz == ELFCLASS32 \
232 ? elf_getu32(swap, cap32.c_un.c_val) \
233 : elf_getu64(swap, cap64.c_un.c_val))
234
235 #define xauxv_addr (clazz == ELFCLASS32 \
236 ? CAST(void *, &auxv32) \
237 : CAST(void *, &auxv64))
238 #define xauxv_sizeof (clazz == ELFCLASS32 \
239 ? sizeof(auxv32) \
240 : sizeof(auxv64))
241 #define xauxv_type (clazz == ELFCLASS32 \
242 ? elf_getu32(swap, auxv32.a_type) \
243 : elf_getu64(swap, auxv64.a_type))
244 #define xauxv_val (clazz == ELFCLASS32 \
245 ? elf_getu32(swap, auxv32.a_v) \
246 : elf_getu64(swap, auxv64.a_v))
247
248 #define prpsoffsets(i) (clazz == ELFCLASS32 \
249 ? prpsoffsets32[i] \
250 : prpsoffsets64[i])
251
252 #ifdef ELFCORE
253 /*
254 * Try larger offsets first to avoid false matches
255 * from earlier data that happen to look like strings.
256 */
257 static const size_t prpsoffsets32[] = {
258 #ifdef USE_NT_PSINFO
259 104, /* SunOS 5.x (command line) */
260 88, /* SunOS 5.x (short name) */
261 #endif /* USE_NT_PSINFO */
262
263 100, /* SunOS 5.x (command line) */
264 84, /* SunOS 5.x (short name) */
265
266 44, /* Linux (command line) */
267 28, /* Linux (short name) */
268
269 48, /* Linux PowerPC (command line) */
270 32, /* Linux PowerPC (short name) */
271
272 8, /* FreeBSD */
273 };
274
275 static const size_t prpsoffsets64[] = {
276 #ifdef USE_NT_PSINFO
277 152, /* SunOS 5.x (command line) */
278 136, /* SunOS 5.x (short name) */
279 #endif /* USE_NT_PSINFO */
280
281 136, /* SunOS 5.x, 64-bit (command line) */
282 120, /* SunOS 5.x, 64-bit (short name) */
283
284 56, /* Linux (command line) */
285 40, /* Linux (tested on core from 2.4.x, short name) */
286
287 16, /* FreeBSD, 64-bit */
288 };
289
290 #define NOFFSETS32 __arraycount(prpsoffsets32)
291 #define NOFFSETS64 __arraycount(prpsoffsets64)
292
293 #define NOFFSETS (clazz == ELFCLASS32 ? NOFFSETS32 : NOFFSETS64)
294
295 /*
296 * Look through the program headers of an executable image, searching
297 * for a PT_NOTE section of type NT_PRPSINFO, with a name "CORE" or
298 * "FreeBSD"; if one is found, try looking in various places in its
299 * contents for a 16-character string containing only printable
300 * characters - if found, that string should be the name of the program
301 * that dropped core. Note: right after that 16-character string is,
302 * at least in SunOS 5.x (and possibly other SVR4-flavored systems) and
303 * Linux, a longer string (80 characters, in 5.x, probably other
304 * SVR4-flavored systems, and Linux) containing the start of the
305 * command line for that program.
306 *
307 * SunOS 5.x core files contain two PT_NOTE sections, with the types
308 * NT_PRPSINFO (old) and NT_PSINFO (new). These structs contain the
309 * same info about the command name and command line, so it probably
310 * isn't worthwhile to look for NT_PSINFO, but the offsets are provided
311 * above (see USE_NT_PSINFO), in case we ever decide to do so. The
312 * NT_PRPSINFO and NT_PSINFO sections are always in order and adjacent;
313 * the SunOS 5.x file command relies on this (and prefers the latter).
314 *
315 * The signal number probably appears in a section of type NT_PRSTATUS,
316 * but that's also rather OS-dependent, in ways that are harder to
317 * dissect with heuristics, so I'm not bothering with the signal number.
318 * (I suppose the signal number could be of interest in situations where
319 * you don't have the binary of the program that dropped core; if you
320 * *do* have that binary, the debugger will probably tell you what
321 * signal it was.)
322 */
323
324 #define OS_STYLE_SVR4 0
325 #define OS_STYLE_FREEBSD 1
326 #define OS_STYLE_NETBSD 2
327
328 private const char os_style_names[][8] = {
329 "SVR4",
330 "FreeBSD",
331 "NetBSD",
332 };
333
334 #define FLAGS_CORE_STYLE 0x0003
335
336 #define FLAGS_DID_CORE 0x0004
337 #define FLAGS_DID_OS_NOTE 0x0008
338 #define FLAGS_DID_BUILD_ID 0x0010
339 #define FLAGS_DID_CORE_STYLE 0x0020
340 #define FLAGS_DID_NETBSD_PAX 0x0040
341 #define FLAGS_DID_NETBSD_MARCH 0x0080
342 #define FLAGS_DID_NETBSD_CMODEL 0x0100
343 #define FLAGS_DID_NETBSD_EMULATION 0x0200
344 #define FLAGS_DID_NETBSD_UNKNOWN 0x0400
345 #define FLAGS_IS_CORE 0x0800
346 #define FLAGS_DID_AUXV 0x1000
347
348 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)349 dophn_core(struct magic_set *ms, int clazz, int swap, int fd, off_t off,
350 int num, size_t size, off_t fsize, int *flags, uint16_t *notecount)
351 {
352 Elf32_Phdr ph32;
353 Elf64_Phdr ph64;
354 size_t offset, len;
355 unsigned char nbuf[BUFSIZ];
356 ssize_t bufsize;
357 off_t ph_off = off;
358 int ph_num = num;
359
360 if (ms->flags & MAGIC_MIME)
361 return 0;
362
363 if (num == 0) {
364 if (file_printf(ms, ", no program header") == -1)
365 return -1;
366 return 0;
367 }
368 if (size != xph_sizeof) {
369 if (file_printf(ms, ", corrupted program header size") == -1)
370 return -1;
371 return 0;
372 }
373
374 /*
375 * Loop through all the program headers.
376 */
377 for ( ; num; num--) {
378 if (pread(fd, xph_addr, xph_sizeof, off) <
379 CAST(ssize_t, xph_sizeof)) {
380 file_badread(ms);
381 return -1;
382 }
383 off += size;
384
385 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) {
386 /* Perhaps warn here */
387 continue;
388 }
389
390 if (xph_type != PT_NOTE)
391 continue;
392
393 /*
394 * This is a PT_NOTE section; loop through all the notes
395 * in the section.
396 */
397 len = xph_filesz < sizeof(nbuf) ? xph_filesz : sizeof(nbuf);
398 if ((bufsize = pread(fd, nbuf, len, xph_offset)) == -1) {
399 file_badread(ms);
400 return -1;
401 }
402 offset = 0;
403 for (;;) {
404 if (offset >= CAST(size_t, bufsize))
405 break;
406 offset = donote(ms, nbuf, offset, CAST(size_t, bufsize),
407 clazz, swap, 4, flags, notecount, fd, ph_off,
408 ph_num, fsize);
409 if (offset == 0)
410 break;
411
412 }
413 }
414 return 0;
415 }
416 #endif
417
418 static int
do_note_netbsd_version(struct magic_set * ms,int swap,void * v)419 do_note_netbsd_version(struct magic_set *ms, int swap, void *v)
420 {
421 uint32_t desc;
422 memcpy(&desc, v, sizeof(desc));
423 desc = elf_getu32(swap, desc);
424
425 if (file_printf(ms, ", for NetBSD") == -1)
426 return -1;
427 /*
428 * The version number used to be stuck as 199905, and was thus
429 * basically content-free. Newer versions of NetBSD have fixed
430 * this and now use the encoding of __NetBSD_Version__:
431 *
432 * MMmmrrpp00
433 *
434 * M = major version
435 * m = minor version
436 * r = release ["",A-Z,Z[A-Z] but numeric]
437 * p = patchlevel
438 */
439 if (desc > 100000000U) {
440 uint32_t ver_patch = (desc / 100) % 100;
441 uint32_t ver_rel = (desc / 10000) % 100;
442 uint32_t ver_min = (desc / 1000000) % 100;
443 uint32_t ver_maj = desc / 100000000;
444
445 if (file_printf(ms, " %u.%u", ver_maj, ver_min) == -1)
446 return -1;
447 if (ver_rel == 0 && ver_patch != 0) {
448 if (file_printf(ms, ".%u", ver_patch) == -1)
449 return -1;
450 } else if (ver_rel != 0) {
451 while (ver_rel > 26) {
452 if (file_printf(ms, "Z") == -1)
453 return -1;
454 ver_rel -= 26;
455 }
456 if (file_printf(ms, "%c", 'A' + ver_rel - 1)
457 == -1)
458 return -1;
459 }
460 }
461 return 0;
462 }
463
464 static int
do_note_freebsd_version(struct magic_set * ms,int swap,void * v)465 do_note_freebsd_version(struct magic_set *ms, int swap, void *v)
466 {
467 uint32_t desc;
468
469 memcpy(&desc, v, sizeof(desc));
470 desc = elf_getu32(swap, desc);
471 if (file_printf(ms, ", for FreeBSD") == -1)
472 return -1;
473
474 /*
475 * Contents is __FreeBSD_version, whose relation to OS
476 * versions is defined by a huge table in the Porter's
477 * Handbook. This is the general scheme:
478 *
479 * Releases:
480 * Mmp000 (before 4.10)
481 * Mmi0p0 (before 5.0)
482 * Mmm0p0
483 *
484 * Development branches:
485 * Mmpxxx (before 4.6)
486 * Mmp1xx (before 4.10)
487 * Mmi1xx (before 5.0)
488 * M000xx (pre-M.0)
489 * Mmm1xx
490 *
491 * M = major version
492 * m = minor version
493 * i = minor version increment (491000 -> 4.10)
494 * p = patchlevel
495 * x = revision
496 *
497 * The first release of FreeBSD to use ELF by default
498 * was version 3.0.
499 */
500 if (desc == 460002) {
501 if (file_printf(ms, " 4.6.2") == -1)
502 return -1;
503 } else if (desc < 460100) {
504 if (file_printf(ms, " %d.%d", desc / 100000,
505 desc / 10000 % 10) == -1)
506 return -1;
507 if (desc / 1000 % 10 > 0)
508 if (file_printf(ms, ".%d", desc / 1000 % 10) == -1)
509 return -1;
510 if ((desc % 1000 > 0) || (desc % 100000 == 0))
511 if (file_printf(ms, " (%d)", desc) == -1)
512 return -1;
513 } else if (desc < 500000) {
514 if (file_printf(ms, " %d.%d", desc / 100000,
515 desc / 10000 % 10 + desc / 1000 % 10) == -1)
516 return -1;
517 if (desc / 100 % 10 > 0) {
518 if (file_printf(ms, " (%d)", desc) == -1)
519 return -1;
520 } else if (desc / 10 % 10 > 0) {
521 if (file_printf(ms, ".%d", desc / 10 % 10) == -1)
522 return -1;
523 }
524 } else {
525 if (file_printf(ms, " %d.%d", desc / 100000,
526 desc / 1000 % 100) == -1)
527 return -1;
528 if ((desc / 100 % 10 > 0) ||
529 (desc % 100000 / 100 == 0)) {
530 if (file_printf(ms, " (%d)", desc) == -1)
531 return -1;
532 } else if (desc / 10 % 10 > 0) {
533 if (file_printf(ms, ".%d", desc / 10 % 10) == -1)
534 return -1;
535 }
536 }
537 return 0;
538 }
539
540 private int
541 /*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)542 do_bid_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type,
543 int swap __attribute__((__unused__)), uint32_t namesz, uint32_t descsz,
544 size_t noff, size_t doff, int *flags)
545 {
546 if (namesz == 4 && strcmp(RCAST(char *, &nbuf[noff]), "GNU") == 0 &&
547 type == NT_GNU_BUILD_ID && (descsz >= 4 && descsz <= 20)) {
548 uint8_t desc[20];
549 const char *btype;
550 uint32_t i;
551 *flags |= FLAGS_DID_BUILD_ID;
552 switch (descsz) {
553 case 8:
554 btype = "xxHash";
555 break;
556 case 16:
557 btype = "md5/uuid";
558 break;
559 case 20:
560 btype = "sha1";
561 break;
562 default:
563 btype = "unknown";
564 break;
565 }
566 if (file_printf(ms, ", BuildID[%s]=", btype) == -1)
567 return -1;
568 memcpy(desc, &nbuf[doff], descsz);
569 for (i = 0; i < descsz; i++)
570 if (file_printf(ms, "%02x", desc[i]) == -1)
571 return -1;
572 return 1;
573 }
574 if (namesz == 4 && strcmp(RCAST(char *, &nbuf[noff]), "Go") == 0 &&
575 type == NT_GO_BUILD_ID && descsz < 128) {
576 char buf[256];
577 if (file_printf(ms, ", Go BuildID=%s",
578 file_copystr(buf, sizeof(buf), descsz,
579 RCAST(const char *, &nbuf[doff]))) == -1)
580 return -1;
581 return 1;
582 }
583 return 0;
584 }
585
586 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)587 do_os_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type,
588 int swap, uint32_t namesz, uint32_t descsz,
589 size_t noff, size_t doff, int *flags)
590 {
591 const char *name = RCAST(const char *, &nbuf[noff]);
592
593 if (namesz == 5 && strcmp(name, "SuSE") == 0 &&
594 type == NT_GNU_VERSION && descsz == 2) {
595 *flags |= FLAGS_DID_OS_NOTE;
596 if (file_printf(ms, ", for SuSE %d.%d", nbuf[doff],
597 nbuf[doff + 1]) == -1)
598 return -1;
599 return 1;
600 }
601
602 if (namesz == 4 && strcmp(name, "GNU") == 0 &&
603 type == NT_GNU_VERSION && descsz == 16) {
604 uint32_t desc[4];
605 memcpy(desc, &nbuf[doff], sizeof(desc));
606
607 *flags |= FLAGS_DID_OS_NOTE;
608 if (file_printf(ms, ", for GNU/") == -1)
609 return -1;
610 switch (elf_getu32(swap, desc[0])) {
611 case GNU_OS_LINUX:
612 if (file_printf(ms, "Linux") == -1)
613 return -1;
614 break;
615 case GNU_OS_HURD:
616 if (file_printf(ms, "Hurd") == -1)
617 return -1;
618 break;
619 case GNU_OS_SOLARIS:
620 if (file_printf(ms, "Solaris") == -1)
621 return -1;
622 break;
623 case GNU_OS_KFREEBSD:
624 if (file_printf(ms, "kFreeBSD") == -1)
625 return -1;
626 break;
627 case GNU_OS_KNETBSD:
628 if (file_printf(ms, "kNetBSD") == -1)
629 return -1;
630 break;
631 default:
632 if (file_printf(ms, "<unknown>") == -1)
633 return -1;
634 }
635 if (file_printf(ms, " %d.%d.%d", elf_getu32(swap, desc[1]),
636 elf_getu32(swap, desc[2]), elf_getu32(swap, desc[3])) == -1)
637 return -1;
638 return 1;
639 }
640
641 if (namesz == 7 && strcmp(name, "NetBSD") == 0) {
642 if (type == NT_NETBSD_VERSION && descsz == 4) {
643 *flags |= FLAGS_DID_OS_NOTE;
644 if (do_note_netbsd_version(ms, swap, &nbuf[doff]) == -1)
645 return -1;
646 return 1;
647 }
648 }
649
650 if (namesz == 8 && strcmp(name, "FreeBSD") == 0) {
651 if (type == NT_FREEBSD_VERSION && descsz == 4) {
652 *flags |= FLAGS_DID_OS_NOTE;
653 if (do_note_freebsd_version(ms, swap, &nbuf[doff])
654 == -1)
655 return -1;
656 return 1;
657 }
658 }
659
660 if (namesz == 8 && strcmp(name, "OpenBSD") == 0 &&
661 type == NT_OPENBSD_VERSION && descsz == 4) {
662 *flags |= FLAGS_DID_OS_NOTE;
663 if (file_printf(ms, ", for OpenBSD") == -1)
664 return -1;
665 /* Content of note is always 0 */
666 return 1;
667 }
668
669 if (namesz == 10 && strcmp(name, "DragonFly") == 0 &&
670 type == NT_DRAGONFLY_VERSION && descsz == 4) {
671 uint32_t desc;
672 *flags |= FLAGS_DID_OS_NOTE;
673 if (file_printf(ms, ", for DragonFly") == -1)
674 return -1;
675 memcpy(&desc, &nbuf[doff], sizeof(desc));
676 desc = elf_getu32(swap, desc);
677 if (file_printf(ms, " %d.%d.%d", desc / 100000,
678 desc / 10000 % 10, desc % 10000) == -1)
679 return -1;
680 return 1;
681 }
682 return 0;
683 }
684
685 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)686 do_pax_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type,
687 int swap, uint32_t namesz, uint32_t descsz,
688 size_t noff, size_t doff, int *flags)
689 {
690 const char *name = RCAST(const char *, &nbuf[noff]);
691
692 if (namesz == 4 && strcmp(name, "PaX") == 0 &&
693 type == NT_NETBSD_PAX && descsz == 4) {
694 static const char *pax[] = {
695 "+mprotect",
696 "-mprotect",
697 "+segvguard",
698 "-segvguard",
699 "+ASLR",
700 "-ASLR",
701 };
702 uint32_t desc;
703 size_t i;
704 int did = 0;
705
706 *flags |= FLAGS_DID_NETBSD_PAX;
707 memcpy(&desc, &nbuf[doff], sizeof(desc));
708 desc = elf_getu32(swap, desc);
709
710 if (desc && file_printf(ms, ", PaX: ") == -1)
711 return -1;
712
713 for (i = 0; i < __arraycount(pax); i++) {
714 if (((1 << CAST(int, i)) & desc) == 0)
715 continue;
716 if (file_printf(ms, "%s%s", did++ ? "," : "",
717 pax[i]) == -1)
718 return -1;
719 }
720 return 1;
721 }
722 return 0;
723 }
724
725 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)726 do_core_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type,
727 int swap, uint32_t namesz, uint32_t descsz,
728 size_t noff, size_t doff, int *flags, size_t size, int clazz)
729 {
730 #ifdef ELFCORE
731 char buf[256];
732 const char *name = RCAST(const char *, &nbuf[noff]);
733
734 int os_style = -1;
735 /*
736 * Sigh. The 2.0.36 kernel in Debian 2.1, at
737 * least, doesn't correctly implement name
738 * sections, in core dumps, as specified by
739 * the "Program Linking" section of "UNIX(R) System
740 * V Release 4 Programmer's Guide: ANSI C and
741 * Programming Support Tools", because my copy
742 * clearly says "The first 'namesz' bytes in 'name'
743 * contain a *null-terminated* [emphasis mine]
744 * character representation of the entry's owner
745 * or originator", but the 2.0.36 kernel code
746 * doesn't include the terminating null in the
747 * name....
748 */
749 if ((namesz == 4 && strncmp(name, "CORE", 4) == 0) ||
750 (namesz == 5 && strcmp(name, "CORE") == 0)) {
751 os_style = OS_STYLE_SVR4;
752 }
753
754 if ((namesz == 8 && strcmp(name, "FreeBSD") == 0)) {
755 os_style = OS_STYLE_FREEBSD;
756 }
757
758 if ((namesz >= 11 && strncmp(name, "NetBSD-CORE", 11)
759 == 0)) {
760 os_style = OS_STYLE_NETBSD;
761 }
762
763 if (os_style != -1 && (*flags & FLAGS_DID_CORE_STYLE) == 0) {
764 if (file_printf(ms, ", %s-style", os_style_names[os_style])
765 == -1)
766 return -1;
767 *flags |= FLAGS_DID_CORE_STYLE;
768 *flags |= os_style;
769 }
770
771 switch (os_style) {
772 case OS_STYLE_NETBSD:
773 if (type == NT_NETBSD_CORE_PROCINFO) {
774 char sbuf[512];
775 struct NetBSD_elfcore_procinfo pi;
776 memset(&pi, 0, sizeof(pi));
777 memcpy(&pi, nbuf + doff, MIN(descsz, sizeof(pi)));
778
779 if (file_printf(ms, ", from '%.31s', pid=%u, uid=%u, "
780 "gid=%u, nlwps=%u, lwp=%u (signal %u/code %u)",
781 file_printable(sbuf, sizeof(sbuf),
782 RCAST(char *, pi.cpi_name), sizeof(pi.cpi_name)),
783 elf_getu32(swap, CAST(uint32_t, pi.cpi_pid)),
784 elf_getu32(swap, pi.cpi_euid),
785 elf_getu32(swap, pi.cpi_egid),
786 elf_getu32(swap, pi.cpi_nlwps),
787 elf_getu32(swap, CAST(uint32_t, pi.cpi_siglwp)),
788 elf_getu32(swap, pi.cpi_signo),
789 elf_getu32(swap, pi.cpi_sigcode)) == -1)
790 return -1;
791
792 *flags |= FLAGS_DID_CORE;
793 return 1;
794 }
795 break;
796
797 case OS_STYLE_FREEBSD:
798 if (type == NT_PRPSINFO && *flags & FLAGS_IS_CORE) {
799 size_t argoff, pidoff;
800
801 if (clazz == ELFCLASS32)
802 argoff = 4 + 4 + 17;
803 else
804 argoff = 4 + 4 + 8 + 17;
805 if (file_printf(ms, ", from '%.80s'", nbuf + doff +
806 argoff) == -1)
807 return -1;
808 pidoff = argoff + 81 + 2;
809 if (doff + pidoff + 4 <= size) {
810 if (file_printf(ms, ", pid=%u",
811 elf_getu32(swap, *RCAST(uint32_t *, (nbuf +
812 doff + pidoff)))) == -1)
813 return -1;
814 }
815 *flags |= FLAGS_DID_CORE;
816 }
817 break;
818
819 default:
820 if (type == NT_PRPSINFO && *flags & FLAGS_IS_CORE) {
821 size_t i, j;
822 unsigned char c;
823 /*
824 * Extract the program name. We assume
825 * it to be 16 characters (that's what it
826 * is in SunOS 5.x and Linux).
827 *
828 * Unfortunately, it's at a different offset
829 * in various OSes, so try multiple offsets.
830 * If the characters aren't all printable,
831 * reject it.
832 */
833 for (i = 0; i < NOFFSETS; i++) {
834 unsigned char *cname, *cp;
835 size_t reloffset = prpsoffsets(i);
836 size_t noffset = doff + reloffset;
837 size_t k;
838 for (j = 0; j < 16; j++, noffset++,
839 reloffset++) {
840 /*
841 * Make sure we're not past
842 * the end of the buffer; if
843 * we are, just give up.
844 */
845 if (noffset >= size)
846 goto tryanother;
847
848 /*
849 * Make sure we're not past
850 * the end of the contents;
851 * if we are, this obviously
852 * isn't the right offset.
853 */
854 if (reloffset >= descsz)
855 goto tryanother;
856
857 c = nbuf[noffset];
858 if (c == '\0') {
859 /*
860 * A '\0' at the
861 * beginning is
862 * obviously wrong.
863 * Any other '\0'
864 * means we're done.
865 */
866 if (j == 0)
867 goto tryanother;
868 else
869 break;
870 } else {
871 /*
872 * A nonprintable
873 * character is also
874 * wrong.
875 */
876 if (!isprint(c) || isquote(c))
877 goto tryanother;
878 }
879 }
880 /*
881 * Well, that worked.
882 */
883
884 /*
885 * Try next offsets, in case this match is
886 * in the middle of a string.
887 */
888 for (k = i + 1 ; k < NOFFSETS; k++) {
889 size_t no;
890 int adjust = 1;
891 if (prpsoffsets(k) >= prpsoffsets(i))
892 continue;
893 for (no = doff + prpsoffsets(k);
894 no < doff + prpsoffsets(i); no++)
895 adjust = adjust
896 && isprint(nbuf[no]);
897 if (adjust)
898 i = k;
899 }
900
901 cname = CAST(unsigned char *,
902 &nbuf[doff + prpsoffsets(i)]);
903 for (cp = cname; cp < nbuf + size && *cp
904 && isprint(*cp); cp++)
905 continue;
906 /*
907 * Linux apparently appends a space at the end
908 * of the command line: remove it.
909 */
910 while (cp > cname && isspace(cp[-1]))
911 cp--;
912 if (file_printf(ms, ", from '%s'",
913 file_copystr(buf, sizeof(buf),
914 CAST(size_t, cp - cname),
915 CAST(const char *, cname))) == -1)
916 return -1;
917 *flags |= FLAGS_DID_CORE;
918 return 1;
919
920 tryanother:
921 ;
922 }
923 }
924 break;
925 }
926 #endif
927 return 0;
928 }
929
930 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)931 get_offset_from_virtaddr(struct magic_set *ms, int swap, int clazz, int fd,
932 off_t off, int num, off_t fsize, uint64_t virtaddr)
933 {
934 Elf32_Phdr ph32;
935 Elf64_Phdr ph64;
936
937 /*
938 * Loop through all the program headers and find the header with
939 * virtual address in which the "virtaddr" belongs to.
940 */
941 for ( ; num; num--) {
942 if (pread(fd, xph_addr, xph_sizeof, off) <
943 CAST(ssize_t, xph_sizeof)) {
944 file_badread(ms);
945 return -1;
946 }
947 off += xph_sizeof;
948
949 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) {
950 /* Perhaps warn here */
951 continue;
952 }
953
954 if (virtaddr >= xph_vaddr && virtaddr < xph_vaddr + xph_filesz)
955 return xph_offset + (virtaddr - xph_vaddr);
956 }
957 return 0;
958 }
959
960 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)961 get_string_on_virtaddr(struct magic_set *ms,
962 int swap, int clazz, int fd, off_t ph_off, int ph_num,
963 off_t fsize, uint64_t virtaddr, char *buf, ssize_t buflen)
964 {
965 char *bptr;
966 off_t offset;
967
968 if (buflen == 0)
969 return 0;
970
971 offset = get_offset_from_virtaddr(ms, swap, clazz, fd, ph_off, ph_num,
972 fsize, virtaddr);
973 if (offset < 0 ||
974 (buflen = pread(fd, buf, CAST(size_t, buflen), offset)) <= 0) {
975 file_badread(ms);
976 return 0;
977 }
978
979 buf[buflen - 1] = '\0';
980
981 /* We expect only printable characters, so return if buffer contains
982 * non-printable character before the '\0' or just '\0'. */
983 for (bptr = buf; *bptr && isprint(CAST(unsigned char, *bptr)); bptr++)
984 continue;
985 if (*bptr != '\0')
986 return 0;
987
988 return bptr - buf;
989 }
990
991
992 /*ARGSUSED*/
993 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)994 do_auxv_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type,
995 int swap, uint32_t namesz __attribute__((__unused__)),
996 uint32_t descsz __attribute__((__unused__)),
997 size_t noff __attribute__((__unused__)), size_t doff,
998 int *flags, size_t size __attribute__((__unused__)), int clazz,
999 int fd, off_t ph_off, int ph_num, off_t fsize)
1000 {
1001 #ifdef ELFCORE
1002 Aux32Info auxv32;
1003 Aux64Info auxv64;
1004 size_t elsize = xauxv_sizeof;
1005 const char *tag;
1006 int is_string;
1007 size_t nval;
1008
1009 if ((*flags & (FLAGS_IS_CORE|FLAGS_DID_CORE_STYLE)) !=
1010 (FLAGS_IS_CORE|FLAGS_DID_CORE_STYLE))
1011 return 0;
1012
1013 switch (*flags & FLAGS_CORE_STYLE) {
1014 case OS_STYLE_SVR4:
1015 if (type != NT_AUXV)
1016 return 0;
1017 break;
1018 #ifdef notyet
1019 case OS_STYLE_NETBSD:
1020 if (type != NT_NETBSD_CORE_AUXV)
1021 return 0;
1022 break;
1023 case OS_STYLE_FREEBSD:
1024 if (type != NT_FREEBSD_PROCSTAT_AUXV)
1025 return 0;
1026 break;
1027 #endif
1028 default:
1029 return 0;
1030 }
1031
1032 *flags |= FLAGS_DID_AUXV;
1033
1034 nval = 0;
1035 for (size_t off = 0; off + elsize <= descsz; off += elsize) {
1036 memcpy(xauxv_addr, &nbuf[doff + off], xauxv_sizeof);
1037 /* Limit processing to 50 vector entries to prevent DoS */
1038 if (nval++ >= 50) {
1039 file_error(ms, 0, "Too many ELF Auxv elements");
1040 return 1;
1041 }
1042
1043 switch(xauxv_type) {
1044 case AT_LINUX_EXECFN:
1045 is_string = 1;
1046 tag = "execfn";
1047 break;
1048 case AT_LINUX_PLATFORM:
1049 is_string = 1;
1050 tag = "platform";
1051 break;
1052 case AT_LINUX_UID:
1053 is_string = 0;
1054 tag = "real uid";
1055 break;
1056 case AT_LINUX_GID:
1057 is_string = 0;
1058 tag = "real gid";
1059 break;
1060 case AT_LINUX_EUID:
1061 is_string = 0;
1062 tag = "effective uid";
1063 break;
1064 case AT_LINUX_EGID:
1065 is_string = 0;
1066 tag = "effective gid";
1067 break;
1068 default:
1069 is_string = 0;
1070 tag = NULL;
1071 break;
1072 }
1073
1074 if (tag == NULL)
1075 continue;
1076
1077 if (is_string) {
1078 char buf[256];
1079 ssize_t buflen;
1080 buflen = get_string_on_virtaddr(ms, swap, clazz, fd,
1081 ph_off, ph_num, fsize, xauxv_val, buf, sizeof(buf));
1082
1083 if (buflen == 0)
1084 continue;
1085
1086 if (file_printf(ms, ", %s: '%s'", tag, buf) == -1)
1087 return -1;
1088 } else {
1089 if (file_printf(ms, ", %s: %d", tag,
1090 CAST(int, xauxv_val)) == -1)
1091 return -1;
1092 }
1093 }
1094 return 1;
1095 #else
1096 return 0;
1097 #endif
1098 }
1099
1100 private size_t
dodynamic(struct magic_set * ms,void * vbuf,size_t offset,size_t size,int clazz,int swap)1101 dodynamic(struct magic_set *ms, void *vbuf, size_t offset, size_t size,
1102 int clazz, int swap)
1103 {
1104 Elf32_Dyn dh32;
1105 Elf64_Dyn dh64;
1106 unsigned char *dbuf = CAST(unsigned char *, vbuf);
1107
1108 if (xdh_sizeof + offset > size) {
1109 /*
1110 * We're out of note headers.
1111 */
1112 return xdh_sizeof + offset;
1113 }
1114
1115 memcpy(xdh_addr, &dbuf[offset], xdh_sizeof);
1116 offset += xdh_sizeof;
1117
1118 switch (xdh_tag) {
1119 case DT_FLAGS_1:
1120 if (xdh_val & DF_1_PIE)
1121 ms->mode |= 0111;
1122 else
1123 ms->mode &= ~0111;
1124 break;
1125 default:
1126 break;
1127 }
1128 return offset;
1129 }
1130
1131
1132 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)1133 donote(struct magic_set *ms, void *vbuf, size_t offset, size_t size,
1134 int clazz, int swap, size_t align, int *flags, uint16_t *notecount,
1135 int fd, off_t ph_off, int ph_num, off_t fsize)
1136 {
1137 Elf32_Nhdr nh32;
1138 Elf64_Nhdr nh64;
1139 size_t noff, doff;
1140 uint32_t namesz, descsz;
1141 char buf[256];
1142 unsigned char *nbuf = CAST(unsigned char *, vbuf);
1143
1144 if (*notecount == 0)
1145 return 0;
1146 --*notecount;
1147
1148 if (xnh_sizeof + offset > size) {
1149 /*
1150 * We're out of note headers.
1151 */
1152 return xnh_sizeof + offset;
1153 }
1154 /*XXX: GCC */
1155 memset(&nh32, 0, sizeof(nh32));
1156 memset(&nh64, 0, sizeof(nh64));
1157
1158 memcpy(xnh_addr, &nbuf[offset], xnh_sizeof);
1159 offset += xnh_sizeof;
1160
1161 namesz = xnh_namesz;
1162 descsz = xnh_descsz;
1163
1164 if ((namesz == 0) && (descsz == 0)) {
1165 /*
1166 * We're out of note headers.
1167 */
1168 return (offset >= size) ? offset : size;
1169 }
1170
1171 if (namesz & 0x80000000) {
1172 if (file_printf(ms, ", bad note name size %#lx",
1173 CAST(unsigned long, namesz)) == -1)
1174 return -1;
1175 return 0;
1176 }
1177
1178 if (descsz & 0x80000000) {
1179 if (file_printf(ms, ", bad note description size %#lx",
1180 CAST(unsigned long, descsz)) == -1)
1181 return -1;
1182 return 0;
1183 }
1184
1185 noff = offset;
1186 doff = ELF_ALIGN(offset + namesz);
1187
1188 if (offset + namesz > size) {
1189 /*
1190 * We're past the end of the buffer.
1191 */
1192 return doff;
1193 }
1194
1195 offset = ELF_ALIGN(doff + descsz);
1196 if (doff + descsz > size) {
1197 /*
1198 * We're past the end of the buffer.
1199 */
1200 return (offset >= size) ? offset : size;
1201 }
1202
1203
1204 if ((*flags & FLAGS_DID_OS_NOTE) == 0) {
1205 if (do_os_note(ms, nbuf, xnh_type, swap,
1206 namesz, descsz, noff, doff, flags))
1207 return offset;
1208 }
1209
1210 if ((*flags & FLAGS_DID_BUILD_ID) == 0) {
1211 if (do_bid_note(ms, nbuf, xnh_type, swap,
1212 namesz, descsz, noff, doff, flags))
1213 return offset;
1214 }
1215
1216 if ((*flags & FLAGS_DID_NETBSD_PAX) == 0) {
1217 if (do_pax_note(ms, nbuf, xnh_type, swap,
1218 namesz, descsz, noff, doff, flags))
1219 return offset;
1220 }
1221
1222 if ((*flags & FLAGS_DID_CORE) == 0) {
1223 if (do_core_note(ms, nbuf, xnh_type, swap,
1224 namesz, descsz, noff, doff, flags, size, clazz))
1225 return offset;
1226 }
1227
1228 if ((*flags & FLAGS_DID_AUXV) == 0) {
1229 if (do_auxv_note(ms, nbuf, xnh_type, swap,
1230 namesz, descsz, noff, doff, flags, size, clazz,
1231 fd, ph_off, ph_num, fsize))
1232 return offset;
1233 }
1234
1235 if (namesz == 7 && strcmp(RCAST(char *, &nbuf[noff]), "NetBSD") == 0) {
1236 int descw, flag;
1237 const char *str, *tag;
1238 if (descsz > 100)
1239 descsz = 100;
1240 switch (xnh_type) {
1241 case NT_NETBSD_VERSION:
1242 return offset;
1243 case NT_NETBSD_MARCH:
1244 flag = FLAGS_DID_NETBSD_MARCH;
1245 tag = "compiled for";
1246 break;
1247 case NT_NETBSD_CMODEL:
1248 flag = FLAGS_DID_NETBSD_CMODEL;
1249 tag = "compiler model";
1250 break;
1251 case NT_NETBSD_EMULATION:
1252 flag = FLAGS_DID_NETBSD_EMULATION;
1253 tag = "emulation:";
1254 break;
1255 default:
1256 if (*flags & FLAGS_DID_NETBSD_UNKNOWN)
1257 return offset;
1258 *flags |= FLAGS_DID_NETBSD_UNKNOWN;
1259 if (file_printf(ms, ", note=%u", xnh_type) == -1)
1260 return offset;
1261 return offset;
1262 }
1263
1264 if (*flags & flag)
1265 return offset;
1266 str = RCAST(const char *, &nbuf[doff]);
1267 descw = CAST(int, descsz);
1268 *flags |= flag;
1269 file_printf(ms, ", %s: %s", tag,
1270 file_copystr(buf, sizeof(buf), descw, str));
1271 return offset;
1272 }
1273
1274 return offset;
1275 }
1276
1277 /* SunOS 5.x hardware capability descriptions */
1278 typedef struct cap_desc {
1279 uint64_t cd_mask;
1280 const char *cd_name;
1281 } cap_desc_t;
1282
1283 static const cap_desc_t cap_desc_sparc[] = {
1284 { AV_SPARC_MUL32, "MUL32" },
1285 { AV_SPARC_DIV32, "DIV32" },
1286 { AV_SPARC_FSMULD, "FSMULD" },
1287 { AV_SPARC_V8PLUS, "V8PLUS" },
1288 { AV_SPARC_POPC, "POPC" },
1289 { AV_SPARC_VIS, "VIS" },
1290 { AV_SPARC_VIS2, "VIS2" },
1291 { AV_SPARC_ASI_BLK_INIT, "ASI_BLK_INIT" },
1292 { AV_SPARC_FMAF, "FMAF" },
1293 { AV_SPARC_FJFMAU, "FJFMAU" },
1294 { AV_SPARC_IMA, "IMA" },
1295 { 0, NULL }
1296 };
1297
1298 static const cap_desc_t cap_desc_386[] = {
1299 { AV_386_FPU, "FPU" },
1300 { AV_386_TSC, "TSC" },
1301 { AV_386_CX8, "CX8" },
1302 { AV_386_SEP, "SEP" },
1303 { AV_386_AMD_SYSC, "AMD_SYSC" },
1304 { AV_386_CMOV, "CMOV" },
1305 { AV_386_MMX, "MMX" },
1306 { AV_386_AMD_MMX, "AMD_MMX" },
1307 { AV_386_AMD_3DNow, "AMD_3DNow" },
1308 { AV_386_AMD_3DNowx, "AMD_3DNowx" },
1309 { AV_386_FXSR, "FXSR" },
1310 { AV_386_SSE, "SSE" },
1311 { AV_386_SSE2, "SSE2" },
1312 { AV_386_PAUSE, "PAUSE" },
1313 { AV_386_SSE3, "SSE3" },
1314 { AV_386_MON, "MON" },
1315 { AV_386_CX16, "CX16" },
1316 { AV_386_AHF, "AHF" },
1317 { AV_386_TSCP, "TSCP" },
1318 { AV_386_AMD_SSE4A, "AMD_SSE4A" },
1319 { AV_386_POPCNT, "POPCNT" },
1320 { AV_386_AMD_LZCNT, "AMD_LZCNT" },
1321 { AV_386_SSSE3, "SSSE3" },
1322 { AV_386_SSE4_1, "SSE4.1" },
1323 { AV_386_SSE4_2, "SSE4.2" },
1324 { 0, NULL }
1325 };
1326
1327 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)1328 doshn(struct magic_set *ms, int clazz, int swap, int fd, off_t off, int num,
1329 size_t size, off_t fsize, int mach, int strtab, int *flags,
1330 uint16_t *notecount)
1331 {
1332 Elf32_Shdr sh32;
1333 Elf64_Shdr sh64;
1334 int stripped = 1, has_debug_info = 0;
1335 size_t nbadcap = 0;
1336 void *nbuf;
1337 off_t noff, coff, name_off;
1338 uint64_t cap_hw1 = 0; /* SunOS 5.x hardware capabilities */
1339 uint64_t cap_sf1 = 0; /* SunOS 5.x software capabilities */
1340 char name[50];
1341 ssize_t namesize;
1342
1343 if (ms->flags & MAGIC_MIME)
1344 return 0;
1345
1346 if (num == 0) {
1347 if (file_printf(ms, ", no section header") == -1)
1348 return -1;
1349 return 0;
1350 }
1351 if (size != xsh_sizeof) {
1352 if (file_printf(ms, ", corrupted section header size") == -1)
1353 return -1;
1354 return 0;
1355 }
1356
1357 /* Read offset of name section to be able to read section names later */
1358 if (pread(fd, xsh_addr, xsh_sizeof, CAST(off_t, (off + size * strtab)))
1359 < CAST(ssize_t, xsh_sizeof)) {
1360 if (file_printf(ms, ", missing section headers") == -1)
1361 return -1;
1362 return 0;
1363 }
1364 name_off = xsh_offset;
1365
1366 if (fsize != SIZE_UNKNOWN && fsize < name_off) {
1367 if (file_printf(ms, ", too large section header offset %jd",
1368 (intmax_t)name_off) == -1)
1369 return -1;
1370 return 0;
1371 }
1372
1373 for ( ; num; num--) {
1374 /* Read the name of this section. */
1375 if ((namesize = pread(fd, name, sizeof(name) - 1,
1376 name_off + xsh_name)) == -1) {
1377 file_badread(ms);
1378 return -1;
1379 }
1380 name[namesize] = '\0';
1381 if (strcmp(name, ".debug_info") == 0) {
1382 has_debug_info = 1;
1383 stripped = 0;
1384 }
1385
1386 if (pread(fd, xsh_addr, xsh_sizeof, off) <
1387 CAST(ssize_t, xsh_sizeof)) {
1388 file_badread(ms);
1389 return -1;
1390 }
1391 off += size;
1392
1393 /* Things we can determine before we seek */
1394 switch (xsh_type) {
1395 case SHT_SYMTAB:
1396 #if 0
1397 case SHT_DYNSYM:
1398 #endif
1399 stripped = 0;
1400 break;
1401 default:
1402 if (fsize != SIZE_UNKNOWN && xsh_offset > fsize) {
1403 /* Perhaps warn here */
1404 continue;
1405 }
1406 break;
1407 }
1408
1409
1410 /* Things we can determine when we seek */
1411 switch (xsh_type) {
1412 case SHT_NOTE:
1413 if (CAST(uintmax_t, (xsh_size + xsh_offset)) >
1414 CAST(uintmax_t, fsize)) {
1415 if (file_printf(ms,
1416 ", note offset/size %#" INTMAX_T_FORMAT
1417 "x+%#" INTMAX_T_FORMAT "x exceeds"
1418 " file size %#" INTMAX_T_FORMAT "x",
1419 CAST(uintmax_t, xsh_offset),
1420 CAST(uintmax_t, xsh_size),
1421 CAST(uintmax_t, fsize)) == -1)
1422 return -1;
1423 return 0;
1424 }
1425 if ((nbuf = malloc(xsh_size)) == NULL) {
1426 file_error(ms, errno, "Cannot allocate memory"
1427 " for note");
1428 return -1;
1429 }
1430 if (pread(fd, nbuf, xsh_size, xsh_offset) <
1431 CAST(ssize_t, xsh_size)) {
1432 file_badread(ms);
1433 free(nbuf);
1434 return -1;
1435 }
1436
1437 noff = 0;
1438 for (;;) {
1439 if (noff >= CAST(off_t, xsh_size))
1440 break;
1441 noff = donote(ms, nbuf, CAST(size_t, noff),
1442 xsh_size, clazz, swap, 4, flags, notecount,
1443 fd, 0, 0, 0);
1444 if (noff == 0)
1445 break;
1446 }
1447 free(nbuf);
1448 break;
1449 case SHT_SUNW_cap:
1450 switch (mach) {
1451 case EM_SPARC:
1452 case EM_SPARCV9:
1453 case EM_IA_64:
1454 case EM_386:
1455 case EM_AMD64:
1456 break;
1457 default:
1458 goto skip;
1459 }
1460
1461 if (nbadcap > 5)
1462 break;
1463 if (lseek(fd, xsh_offset, SEEK_SET)
1464 == CAST(off_t, -1)) {
1465 file_badseek(ms);
1466 return -1;
1467 }
1468 coff = 0;
1469 for (;;) {
1470 Elf32_Cap cap32;
1471 Elf64_Cap cap64;
1472 char cbuf[/*CONSTCOND*/
1473 MAX(sizeof(cap32), sizeof(cap64))];
1474 if ((coff += xcap_sizeof) >
1475 CAST(off_t, xsh_size))
1476 break;
1477 if (read(fd, cbuf, CAST(size_t, xcap_sizeof)) !=
1478 CAST(ssize_t, xcap_sizeof)) {
1479 file_badread(ms);
1480 return -1;
1481 }
1482 if (cbuf[0] == 'A') {
1483 #ifdef notyet
1484 char *p = cbuf + 1;
1485 uint32_t len, tag;
1486 memcpy(&len, p, sizeof(len));
1487 p += 4;
1488 len = getu32(swap, len);
1489 if (memcmp("gnu", p, 3) != 0) {
1490 if (file_printf(ms,
1491 ", unknown capability %.3s", p)
1492 == -1)
1493 return -1;
1494 break;
1495 }
1496 p += strlen(p) + 1;
1497 tag = *p++;
1498 memcpy(&len, p, sizeof(len));
1499 p += 4;
1500 len = getu32(swap, len);
1501 if (tag != 1) {
1502 if (file_printf(ms, ", unknown gnu"
1503 " capability tag %d", tag)
1504 == -1)
1505 return -1;
1506 break;
1507 }
1508 // gnu attributes
1509 #endif
1510 break;
1511 }
1512 memcpy(xcap_addr, cbuf, xcap_sizeof);
1513 switch (xcap_tag) {
1514 case CA_SUNW_NULL:
1515 break;
1516 case CA_SUNW_HW_1:
1517 cap_hw1 |= xcap_val;
1518 break;
1519 case CA_SUNW_SF_1:
1520 cap_sf1 |= xcap_val;
1521 break;
1522 default:
1523 if (file_printf(ms,
1524 ", with unknown capability "
1525 "%#" INT64_T_FORMAT "x = %#"
1526 INT64_T_FORMAT "x",
1527 CAST(unsigned long long, xcap_tag),
1528 CAST(unsigned long long, xcap_val))
1529 == -1)
1530 return -1;
1531 if (nbadcap++ > 2)
1532 coff = xsh_size;
1533 break;
1534 }
1535 }
1536 /*FALLTHROUGH*/
1537 skip:
1538 default:
1539 break;
1540 }
1541 }
1542
1543 if (has_debug_info) {
1544 if (file_printf(ms, ", with debug_info") == -1)
1545 return -1;
1546 }
1547 if (file_printf(ms, ", %sstripped", stripped ? "" : "not ") == -1)
1548 return -1;
1549 if (cap_hw1) {
1550 const cap_desc_t *cdp;
1551 switch (mach) {
1552 case EM_SPARC:
1553 case EM_SPARC32PLUS:
1554 case EM_SPARCV9:
1555 cdp = cap_desc_sparc;
1556 break;
1557 case EM_386:
1558 case EM_IA_64:
1559 case EM_AMD64:
1560 cdp = cap_desc_386;
1561 break;
1562 default:
1563 cdp = NULL;
1564 break;
1565 }
1566 if (file_printf(ms, ", uses") == -1)
1567 return -1;
1568 if (cdp) {
1569 while (cdp->cd_name) {
1570 if (cap_hw1 & cdp->cd_mask) {
1571 if (file_printf(ms,
1572 " %s", cdp->cd_name) == -1)
1573 return -1;
1574 cap_hw1 &= ~cdp->cd_mask;
1575 }
1576 ++cdp;
1577 }
1578 if (cap_hw1)
1579 if (file_printf(ms,
1580 " unknown hardware capability %#"
1581 INT64_T_FORMAT "x",
1582 CAST(unsigned long long, cap_hw1)) == -1)
1583 return -1;
1584 } else {
1585 if (file_printf(ms,
1586 " hardware capability %#" INT64_T_FORMAT "x",
1587 CAST(unsigned long long, cap_hw1)) == -1)
1588 return -1;
1589 }
1590 }
1591 if (cap_sf1) {
1592 if (cap_sf1 & SF1_SUNW_FPUSED) {
1593 if (file_printf(ms,
1594 (cap_sf1 & SF1_SUNW_FPKNWN)
1595 ? ", uses frame pointer"
1596 : ", not known to use frame pointer") == -1)
1597 return -1;
1598 }
1599 cap_sf1 &= ~SF1_SUNW_MASK;
1600 if (cap_sf1)
1601 if (file_printf(ms,
1602 ", with unknown software capability %#"
1603 INT64_T_FORMAT "x",
1604 CAST(unsigned long long, cap_sf1)) == -1)
1605 return -1;
1606 }
1607 return 0;
1608 }
1609
1610 /*
1611 * Look through the program headers of an executable image, searching
1612 * for a PT_INTERP section; if one is found, it's dynamically linked,
1613 * otherwise it's statically linked.
1614 */
1615 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)1616 dophn_exec(struct magic_set *ms, int clazz, int swap, int fd, off_t off,
1617 int num, size_t size, off_t fsize, int sh_num, int *flags,
1618 uint16_t *notecount)
1619 {
1620 Elf32_Phdr ph32;
1621 Elf64_Phdr ph64;
1622 const char *linking_style = "statically";
1623 unsigned char nbuf[BUFSIZ];
1624 char ibuf[BUFSIZ];
1625 char interp[BUFSIZ];
1626 ssize_t bufsize;
1627 size_t offset, align, len;
1628
1629 if (num == 0) {
1630 if (file_printf(ms, ", no program header") == -1)
1631 return -1;
1632 return 0;
1633 }
1634 if (size != xph_sizeof) {
1635 if (file_printf(ms, ", corrupted program header size") == -1)
1636 return -1;
1637 return 0;
1638 }
1639
1640 interp[0] = '\0';
1641 for ( ; num; num--) {
1642 int doread;
1643 if (pread(fd, xph_addr, xph_sizeof, off) <
1644 CAST(ssize_t, xph_sizeof)) {
1645 file_badread(ms);
1646 return -1;
1647 }
1648
1649 off += size;
1650 bufsize = 0;
1651 align = 4;
1652
1653 /* Things we can determine before we seek */
1654 switch (xph_type) {
1655 case PT_DYNAMIC:
1656 doread = 1;
1657 linking_style = "dynamically";
1658 break;
1659 case PT_NOTE:
1660 if (sh_num) /* Did this through section headers */
1661 continue;
1662 if (((align = xph_align) & 0x80000000UL) != 0 ||
1663 align < 4) {
1664 if (file_printf(ms,
1665 ", invalid note alignment %#lx",
1666 CAST(unsigned long, align)) == -1)
1667 return -1;
1668 align = 4;
1669 }
1670 /*FALLTHROUGH*/
1671 case PT_INTERP:
1672 doread = 1;
1673 break;
1674 default:
1675 doread = 0;
1676 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) {
1677 /* Maybe warn here? */
1678 continue;
1679 }
1680 break;
1681 }
1682
1683 if (doread) {
1684 len = xph_filesz < sizeof(nbuf) ? xph_filesz
1685 : sizeof(nbuf);
1686 bufsize = pread(fd, nbuf, len, xph_offset);
1687 if (bufsize == -1) {
1688 file_badread(ms);
1689 return -1;
1690 }
1691 } else
1692 len = 0;
1693
1694 /* Things we can determine when we seek */
1695 switch (xph_type) {
1696 case PT_DYNAMIC:
1697 offset = 0;
1698 // Let DF_1 determine if we are PIE or not.
1699 ms->mode &= ~0111;
1700 for (;;) {
1701 if (offset >= CAST(size_t, bufsize))
1702 break;
1703 offset = dodynamic(ms, nbuf, offset,
1704 CAST(size_t, bufsize), clazz, swap);
1705 if (offset == 0)
1706 break;
1707 }
1708 if (ms->flags & MAGIC_MIME)
1709 continue;
1710 break;
1711
1712 case PT_INTERP:
1713 if (ms->flags & MAGIC_MIME)
1714 continue;
1715 if (bufsize && nbuf[0]) {
1716 nbuf[bufsize - 1] = '\0';
1717 memcpy(interp, nbuf, CAST(size_t, bufsize));
1718 } else
1719 strlcpy(interp, "*empty*", sizeof(interp));
1720 break;
1721 case PT_NOTE:
1722 if (ms->flags & MAGIC_MIME)
1723 return 0;
1724 /*
1725 * This is a PT_NOTE section; loop through all the notes
1726 * in the section.
1727 */
1728 offset = 0;
1729 for (;;) {
1730 if (offset >= CAST(size_t, bufsize))
1731 break;
1732 offset = donote(ms, nbuf, offset,
1733 CAST(size_t, bufsize), clazz, swap, align,
1734 flags, notecount, fd, 0, 0, 0);
1735 if (offset == 0)
1736 break;
1737 }
1738 break;
1739 default:
1740 if (ms->flags & MAGIC_MIME)
1741 continue;
1742 break;
1743 }
1744 }
1745 if (ms->flags & MAGIC_MIME)
1746 return 0;
1747 if (file_printf(ms, ", %s linked", linking_style)
1748 == -1)
1749 return -1;
1750 if (interp[0])
1751 if (file_printf(ms, ", interpreter %s",
1752 file_printable(ibuf, sizeof(ibuf), interp, sizeof(interp)))
1753 == -1)
1754 return -1;
1755 return 0;
1756 }
1757
1758
1759 protected int
file_tryelf(struct magic_set * ms,const struct buffer * b)1760 file_tryelf(struct magic_set *ms, const struct buffer *b)
1761 {
1762 int fd = b->fd;
1763 const unsigned char *buf = CAST(const unsigned char *, b->fbuf);
1764 size_t nbytes = b->flen;
1765 union {
1766 int32_t l;
1767 char c[sizeof(int32_t)];
1768 } u;
1769 int clazz;
1770 int swap;
1771 struct stat st;
1772 const struct stat *stp;
1773 off_t fsize;
1774 int flags = 0;
1775 Elf32_Ehdr elf32hdr;
1776 Elf64_Ehdr elf64hdr;
1777 uint16_t type, phnum, shnum, notecount;
1778
1779 if (ms->flags & (MAGIC_APPLE|MAGIC_EXTENSION))
1780 return 0;
1781 /*
1782 * ELF executables have multiple section headers in arbitrary
1783 * file locations and thus file(1) cannot determine it from easily.
1784 * Instead we traverse thru all section headers until a symbol table
1785 * one is found or else the binary is stripped.
1786 * Return immediately if it's not ELF (so we avoid pipe2file unless
1787 * needed).
1788 */
1789 if (buf[EI_MAG0] != ELFMAG0
1790 || (buf[EI_MAG1] != ELFMAG1 && buf[EI_MAG1] != OLFMAG1)
1791 || buf[EI_MAG2] != ELFMAG2 || buf[EI_MAG3] != ELFMAG3)
1792 return 0;
1793
1794 /*
1795 * If we cannot seek, it must be a pipe, socket or fifo.
1796 */
1797 if((lseek(fd, CAST(off_t, 0), SEEK_SET) == CAST(off_t, -1))
1798 && (errno == ESPIPE))
1799 fd = file_pipe2file(ms, fd, buf, nbytes);
1800
1801 if (fd == -1) {
1802 file_badread(ms);
1803 return -1;
1804 }
1805
1806 stp = &b->st;
1807 /*
1808 * b->st.st_size != 0 if previous fstat() succeeded,
1809 * which is likely, we can avoid extra stat() call.
1810 */
1811 if (b->st.st_size == 0) {
1812 stp = &st;
1813 if (fstat(fd, &st) == -1) {
1814 file_badread(ms);
1815 return -1;
1816 }
1817 }
1818 if (S_ISREG(stp->st_mode) || stp->st_size != 0)
1819 fsize = stp->st_size;
1820 else
1821 fsize = SIZE_UNKNOWN;
1822
1823 clazz = buf[EI_CLASS];
1824
1825 switch (clazz) {
1826 case ELFCLASS32:
1827 #undef elf_getu
1828 #define elf_getu(a, b) elf_getu32(a, b)
1829 #undef elfhdr
1830 #define elfhdr elf32hdr
1831 #include "elfclass.h"
1832 case ELFCLASS64:
1833 #undef elf_getu
1834 #define elf_getu(a, b) elf_getu64(a, b)
1835 #undef elfhdr
1836 #define elfhdr elf64hdr
1837 #include "elfclass.h"
1838 default:
1839 if (file_printf(ms, ", unknown class %d", clazz) == -1)
1840 return -1;
1841 break;
1842 }
1843 return 0;
1844 }
1845 #endif
1846