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 1.178 2021/06/30 10:08:48 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, offs;
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 if (file_printf(ms,
381 ", can't read elf program headers at %jd",
382 (intmax_t)off) == -1)
383 return -1;
384 return 0;
385 }
386 off += size;
387
388 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) {
389 /* Perhaps warn here */
390 continue;
391 }
392
393 if (xph_type != PT_NOTE)
394 continue;
395
396 /*
397 * This is a PT_NOTE section; loop through all the notes
398 * in the section.
399 */
400 len = xph_filesz < sizeof(nbuf) ? xph_filesz : sizeof(nbuf);
401 offs = xph_offset;
402 if ((bufsize = pread(fd, nbuf, len, offs)) == -1) {
403 if (file_printf(ms, " can't read note section at %jd",
404 (intmax_t)offs) == -1)
405 return -1;
406 return 0;
407 }
408 offset = 0;
409 for (;;) {
410 if (offset >= CAST(size_t, bufsize))
411 break;
412 offset = donote(ms, nbuf, offset, CAST(size_t, bufsize),
413 clazz, swap, 4, flags, notecount, fd, ph_off,
414 ph_num, fsize);
415 if (offset == 0)
416 break;
417
418 }
419 }
420 return 0;
421 }
422 #endif
423
424 static int
do_note_netbsd_version(struct magic_set * ms,int swap,void * v)425 do_note_netbsd_version(struct magic_set *ms, int swap, void *v)
426 {
427 uint32_t desc;
428 memcpy(&desc, v, sizeof(desc));
429 desc = elf_getu32(swap, desc);
430
431 if (file_printf(ms, ", for NetBSD") == -1)
432 return -1;
433 /*
434 * The version number used to be stuck as 199905, and was thus
435 * basically content-free. Newer versions of NetBSD have fixed
436 * this and now use the encoding of __NetBSD_Version__:
437 *
438 * MMmmrrpp00
439 *
440 * M = major version
441 * m = minor version
442 * r = release ["",A-Z,Z[A-Z] but numeric]
443 * p = patchlevel
444 */
445 if (desc > 100000000U) {
446 uint32_t ver_patch = (desc / 100) % 100;
447 uint32_t ver_rel = (desc / 10000) % 100;
448 uint32_t ver_min = (desc / 1000000) % 100;
449 uint32_t ver_maj = desc / 100000000;
450
451 if (file_printf(ms, " %u.%u", ver_maj, ver_min) == -1)
452 return -1;
453 if (ver_rel == 0 && ver_patch != 0) {
454 if (file_printf(ms, ".%u", ver_patch) == -1)
455 return -1;
456 } else if (ver_rel != 0) {
457 while (ver_rel > 26) {
458 if (file_printf(ms, "Z") == -1)
459 return -1;
460 ver_rel -= 26;
461 }
462 if (file_printf(ms, "%c", 'A' + ver_rel - 1)
463 == -1)
464 return -1;
465 }
466 }
467 return 0;
468 }
469
470 static int
do_note_freebsd_version(struct magic_set * ms,int swap,void * v)471 do_note_freebsd_version(struct magic_set *ms, int swap, void *v)
472 {
473 uint32_t desc;
474
475 memcpy(&desc, v, sizeof(desc));
476 desc = elf_getu32(swap, desc);
477 if (file_printf(ms, ", for FreeBSD") == -1)
478 return -1;
479
480 /*
481 * Contents is __FreeBSD_version, whose relation to OS
482 * versions is defined by a huge table in the Porter's
483 * Handbook. This is the general scheme:
484 *
485 * Releases:
486 * Mmp000 (before 4.10)
487 * Mmi0p0 (before 5.0)
488 * Mmm0p0
489 *
490 * Development branches:
491 * Mmpxxx (before 4.6)
492 * Mmp1xx (before 4.10)
493 * Mmi1xx (before 5.0)
494 * M000xx (pre-M.0)
495 * Mmm1xx
496 *
497 * M = major version
498 * m = minor version
499 * i = minor version increment (491000 -> 4.10)
500 * p = patchlevel
501 * x = revision
502 *
503 * The first release of FreeBSD to use ELF by default
504 * was version 3.0.
505 */
506 if (desc == 460002) {
507 if (file_printf(ms, " 4.6.2") == -1)
508 return -1;
509 } else if (desc < 460100) {
510 if (file_printf(ms, " %d.%d", desc / 100000,
511 desc / 10000 % 10) == -1)
512 return -1;
513 if (desc / 1000 % 10 > 0)
514 if (file_printf(ms, ".%d", desc / 1000 % 10) == -1)
515 return -1;
516 if ((desc % 1000 > 0) || (desc % 100000 == 0))
517 if (file_printf(ms, " (%d)", desc) == -1)
518 return -1;
519 } else if (desc < 500000) {
520 if (file_printf(ms, " %d.%d", desc / 100000,
521 desc / 10000 % 10 + desc / 1000 % 10) == -1)
522 return -1;
523 if (desc / 100 % 10 > 0) {
524 if (file_printf(ms, " (%d)", desc) == -1)
525 return -1;
526 } else if (desc / 10 % 10 > 0) {
527 if (file_printf(ms, ".%d", desc / 10 % 10) == -1)
528 return -1;
529 }
530 } else {
531 if (file_printf(ms, " %d.%d", desc / 100000,
532 desc / 1000 % 100) == -1)
533 return -1;
534 if ((desc / 100 % 10 > 0) ||
535 (desc % 100000 / 100 == 0)) {
536 if (file_printf(ms, " (%d)", desc) == -1)
537 return -1;
538 } else if (desc / 10 % 10 > 0) {
539 if (file_printf(ms, ".%d", desc / 10 % 10) == -1)
540 return -1;
541 }
542 }
543 return 0;
544 }
545
546 private int
547 /*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)548 do_bid_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type,
549 int swap __attribute__((__unused__)), uint32_t namesz, uint32_t descsz,
550 size_t noff, size_t doff, int *flags)
551 {
552 if (namesz == 4 && strcmp(RCAST(char *, &nbuf[noff]), "GNU") == 0 &&
553 type == NT_GNU_BUILD_ID && (descsz >= 4 && descsz <= 20)) {
554 uint8_t desc[20];
555 const char *btype;
556 uint32_t i;
557 *flags |= FLAGS_DID_BUILD_ID;
558 switch (descsz) {
559 case 8:
560 btype = "xxHash";
561 break;
562 case 16:
563 btype = "md5/uuid";
564 break;
565 case 20:
566 btype = "sha1";
567 break;
568 default:
569 btype = "unknown";
570 break;
571 }
572 if (file_printf(ms, ", BuildID[%s]=", btype) == -1)
573 return -1;
574 memcpy(desc, &nbuf[doff], descsz);
575 for (i = 0; i < descsz; i++)
576 if (file_printf(ms, "%02x", desc[i]) == -1)
577 return -1;
578 return 1;
579 }
580 if (namesz == 4 && strcmp(RCAST(char *, &nbuf[noff]), "Go") == 0 &&
581 type == NT_GO_BUILD_ID && descsz < 128) {
582 char buf[256];
583 if (file_printf(ms, ", Go BuildID=%s",
584 file_copystr(buf, sizeof(buf), descsz,
585 RCAST(const char *, &nbuf[doff]))) == -1)
586 return -1;
587 return 1;
588 }
589 return 0;
590 }
591
592 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)593 do_os_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type,
594 int swap, uint32_t namesz, uint32_t descsz,
595 size_t noff, size_t doff, int *flags)
596 {
597 const char *name = RCAST(const char *, &nbuf[noff]);
598
599 if (namesz == 5 && strcmp(name, "SuSE") == 0 &&
600 type == NT_GNU_VERSION && descsz == 2) {
601 *flags |= FLAGS_DID_OS_NOTE;
602 if (file_printf(ms, ", for SuSE %d.%d", nbuf[doff],
603 nbuf[doff + 1]) == -1)
604 return -1;
605 return 1;
606 }
607
608 if (namesz == 4 && strcmp(name, "GNU") == 0 &&
609 type == NT_GNU_VERSION && descsz == 16) {
610 uint32_t desc[4];
611 memcpy(desc, &nbuf[doff], sizeof(desc));
612
613 *flags |= FLAGS_DID_OS_NOTE;
614 if (file_printf(ms, ", for GNU/") == -1)
615 return -1;
616 switch (elf_getu32(swap, desc[0])) {
617 case GNU_OS_LINUX:
618 if (file_printf(ms, "Linux") == -1)
619 return -1;
620 break;
621 case GNU_OS_HURD:
622 if (file_printf(ms, "Hurd") == -1)
623 return -1;
624 break;
625 case GNU_OS_SOLARIS:
626 if (file_printf(ms, "Solaris") == -1)
627 return -1;
628 break;
629 case GNU_OS_KFREEBSD:
630 if (file_printf(ms, "kFreeBSD") == -1)
631 return -1;
632 break;
633 case GNU_OS_KNETBSD:
634 if (file_printf(ms, "kNetBSD") == -1)
635 return -1;
636 break;
637 default:
638 if (file_printf(ms, "<unknown>") == -1)
639 return -1;
640 }
641 if (file_printf(ms, " %d.%d.%d", elf_getu32(swap, desc[1]),
642 elf_getu32(swap, desc[2]), elf_getu32(swap, desc[3])) == -1)
643 return -1;
644 return 1;
645 }
646
647 if (namesz == 7 && strcmp(name, "NetBSD") == 0) {
648 if (type == NT_NETBSD_VERSION && descsz == 4) {
649 *flags |= FLAGS_DID_OS_NOTE;
650 if (do_note_netbsd_version(ms, swap, &nbuf[doff]) == -1)
651 return -1;
652 return 1;
653 }
654 }
655
656 if (namesz == 8 && strcmp(name, "FreeBSD") == 0) {
657 if (type == NT_FREEBSD_VERSION && descsz == 4) {
658 *flags |= FLAGS_DID_OS_NOTE;
659 if (do_note_freebsd_version(ms, swap, &nbuf[doff])
660 == -1)
661 return -1;
662 return 1;
663 }
664 }
665
666 if (namesz == 8 && strcmp(name, "OpenBSD") == 0 &&
667 type == NT_OPENBSD_VERSION && descsz == 4) {
668 *flags |= FLAGS_DID_OS_NOTE;
669 if (file_printf(ms, ", for OpenBSD") == -1)
670 return -1;
671 /* Content of note is always 0 */
672 return 1;
673 }
674
675 if (namesz == 10 && strcmp(name, "DragonFly") == 0 &&
676 type == NT_DRAGONFLY_VERSION && descsz == 4) {
677 uint32_t desc;
678 *flags |= FLAGS_DID_OS_NOTE;
679 if (file_printf(ms, ", for DragonFly") == -1)
680 return -1;
681 memcpy(&desc, &nbuf[doff], sizeof(desc));
682 desc = elf_getu32(swap, desc);
683 if (file_printf(ms, " %d.%d.%d", desc / 100000,
684 desc / 10000 % 10, desc % 10000) == -1)
685 return -1;
686 return 1;
687 }
688 return 0;
689 }
690
691 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)692 do_pax_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type,
693 int swap, uint32_t namesz, uint32_t descsz,
694 size_t noff, size_t doff, int *flags)
695 {
696 const char *name = RCAST(const char *, &nbuf[noff]);
697
698 if (namesz == 4 && strcmp(name, "PaX") == 0 &&
699 type == NT_NETBSD_PAX && descsz == 4) {
700 static const char *pax[] = {
701 "+mprotect",
702 "-mprotect",
703 "+segvguard",
704 "-segvguard",
705 "+ASLR",
706 "-ASLR",
707 };
708 uint32_t desc;
709 size_t i;
710 int did = 0;
711
712 *flags |= FLAGS_DID_NETBSD_PAX;
713 memcpy(&desc, &nbuf[doff], sizeof(desc));
714 desc = elf_getu32(swap, desc);
715
716 if (desc && file_printf(ms, ", PaX: ") == -1)
717 return -1;
718
719 for (i = 0; i < __arraycount(pax); i++) {
720 if (((1 << CAST(int, i)) & desc) == 0)
721 continue;
722 if (file_printf(ms, "%s%s", did++ ? "," : "",
723 pax[i]) == -1)
724 return -1;
725 }
726 return 1;
727 }
728 return 0;
729 }
730
731 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)732 do_core_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type,
733 int swap, uint32_t namesz, uint32_t descsz,
734 size_t noff, size_t doff, int *flags, size_t size, int clazz)
735 {
736 #ifdef ELFCORE
737 char buf[256];
738 const char *name = RCAST(const char *, &nbuf[noff]);
739
740 int os_style = -1;
741 /*
742 * Sigh. The 2.0.36 kernel in Debian 2.1, at
743 * least, doesn't correctly implement name
744 * sections, in core dumps, as specified by
745 * the "Program Linking" section of "UNIX(R) System
746 * V Release 4 Programmer's Guide: ANSI C and
747 * Programming Support Tools", because my copy
748 * clearly says "The first 'namesz' bytes in 'name'
749 * contain a *null-terminated* [emphasis mine]
750 * character representation of the entry's owner
751 * or originator", but the 2.0.36 kernel code
752 * doesn't include the terminating null in the
753 * name....
754 */
755 if ((namesz == 4 && strncmp(name, "CORE", 4) == 0) ||
756 (namesz == 5 && strcmp(name, "CORE") == 0)) {
757 os_style = OS_STYLE_SVR4;
758 }
759
760 if ((namesz == 8 && strcmp(name, "FreeBSD") == 0)) {
761 os_style = OS_STYLE_FREEBSD;
762 }
763
764 if ((namesz >= 11 && strncmp(name, "NetBSD-CORE", 11)
765 == 0)) {
766 os_style = OS_STYLE_NETBSD;
767 }
768
769 if (os_style != -1 && (*flags & FLAGS_DID_CORE_STYLE) == 0) {
770 if (file_printf(ms, ", %s-style", os_style_names[os_style])
771 == -1)
772 return -1;
773 *flags |= FLAGS_DID_CORE_STYLE;
774 *flags |= os_style;
775 }
776
777 switch (os_style) {
778 case OS_STYLE_NETBSD:
779 if (type == NT_NETBSD_CORE_PROCINFO) {
780 char sbuf[512];
781 struct NetBSD_elfcore_procinfo pi;
782 memset(&pi, 0, sizeof(pi));
783 memcpy(&pi, nbuf + doff, MIN(descsz, sizeof(pi)));
784
785 if (file_printf(ms, ", from '%.31s', pid=%u, uid=%u, "
786 "gid=%u, nlwps=%u, lwp=%u (signal %u/code %u)",
787 file_printable(ms, sbuf, sizeof(sbuf),
788 RCAST(char *, pi.cpi_name), sizeof(pi.cpi_name)),
789 elf_getu32(swap, CAST(uint32_t, pi.cpi_pid)),
790 elf_getu32(swap, pi.cpi_euid),
791 elf_getu32(swap, pi.cpi_egid),
792 elf_getu32(swap, pi.cpi_nlwps),
793 elf_getu32(swap, CAST(uint32_t, pi.cpi_siglwp)),
794 elf_getu32(swap, pi.cpi_signo),
795 elf_getu32(swap, pi.cpi_sigcode)) == -1)
796 return -1;
797
798 *flags |= FLAGS_DID_CORE;
799 return 1;
800 }
801 break;
802
803 case OS_STYLE_FREEBSD:
804 if (type == NT_PRPSINFO && *flags & FLAGS_IS_CORE) {
805 size_t argoff, pidoff;
806
807 if (clazz == ELFCLASS32)
808 argoff = 4 + 4 + 17;
809 else
810 argoff = 4 + 4 + 8 + 17;
811 if (file_printf(ms, ", from '%.80s'", nbuf + doff +
812 argoff) == -1)
813 return -1;
814 pidoff = argoff + 81 + 2;
815 if (doff + pidoff + 4 <= size) {
816 if (file_printf(ms, ", pid=%u",
817 elf_getu32(swap, *RCAST(uint32_t *, (nbuf +
818 doff + pidoff)))) == -1)
819 return -1;
820 }
821 *flags |= FLAGS_DID_CORE;
822 }
823 break;
824
825 default:
826 if (type == NT_PRPSINFO && *flags & FLAGS_IS_CORE) {
827 size_t i, j;
828 unsigned char c;
829 /*
830 * Extract the program name. We assume
831 * it to be 16 characters (that's what it
832 * is in SunOS 5.x and Linux).
833 *
834 * Unfortunately, it's at a different offset
835 * in various OSes, so try multiple offsets.
836 * If the characters aren't all printable,
837 * reject it.
838 */
839 for (i = 0; i < NOFFSETS; i++) {
840 unsigned char *cname, *cp;
841 size_t reloffset = prpsoffsets(i);
842 size_t noffset = doff + reloffset;
843 size_t k;
844 for (j = 0; j < 16; j++, noffset++,
845 reloffset++) {
846 /*
847 * Make sure we're not past
848 * the end of the buffer; if
849 * we are, just give up.
850 */
851 if (noffset >= size)
852 goto tryanother;
853
854 /*
855 * Make sure we're not past
856 * the end of the contents;
857 * if we are, this obviously
858 * isn't the right offset.
859 */
860 if (reloffset >= descsz)
861 goto tryanother;
862
863 c = nbuf[noffset];
864 if (c == '\0') {
865 /*
866 * A '\0' at the
867 * beginning is
868 * obviously wrong.
869 * Any other '\0'
870 * means we're done.
871 */
872 if (j == 0)
873 goto tryanother;
874 else
875 break;
876 } else {
877 /*
878 * A nonprintable
879 * character is also
880 * wrong.
881 */
882 if (!isprint(c) || isquote(c))
883 goto tryanother;
884 }
885 }
886 /*
887 * Well, that worked.
888 */
889
890 /*
891 * Try next offsets, in case this match is
892 * in the middle of a string.
893 */
894 for (k = i + 1 ; k < NOFFSETS; k++) {
895 size_t no;
896 int adjust = 1;
897 if (prpsoffsets(k) >= prpsoffsets(i))
898 continue;
899 for (no = doff + prpsoffsets(k);
900 no < doff + prpsoffsets(i); no++)
901 adjust = adjust
902 && isprint(nbuf[no]);
903 if (adjust)
904 i = k;
905 }
906
907 cname = CAST(unsigned char *,
908 &nbuf[doff + prpsoffsets(i)]);
909 for (cp = cname; cp < nbuf + size && *cp
910 && isprint(*cp); cp++)
911 continue;
912 /*
913 * Linux apparently appends a space at the end
914 * of the command line: remove it.
915 */
916 while (cp > cname && isspace(cp[-1]))
917 cp--;
918 if (file_printf(ms, ", from '%s'",
919 file_copystr(buf, sizeof(buf),
920 CAST(size_t, cp - cname),
921 RCAST(char *, cname))) == -1)
922 return -1;
923 *flags |= FLAGS_DID_CORE;
924 return 1;
925
926 tryanother:
927 ;
928 }
929 }
930 break;
931 }
932 #endif
933 return 0;
934 }
935
936 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)937 get_offset_from_virtaddr(struct magic_set *ms, int swap, int clazz, int fd,
938 off_t off, int num, off_t fsize, uint64_t virtaddr)
939 {
940 Elf32_Phdr ph32;
941 Elf64_Phdr ph64;
942
943 /*
944 * Loop through all the program headers and find the header with
945 * virtual address in which the "virtaddr" belongs to.
946 */
947 for ( ; num; num--) {
948 if (pread(fd, xph_addr, xph_sizeof, off) <
949 CAST(ssize_t, xph_sizeof)) {
950 if (file_printf(ms,
951 ", can't read elf program header at %jd",
952 (intmax_t)off) == -1)
953 return -1;
954 return 0;
955
956 }
957 off += xph_sizeof;
958
959 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) {
960 /* Perhaps warn here */
961 continue;
962 }
963
964 if (virtaddr >= xph_vaddr && virtaddr < xph_vaddr + xph_filesz)
965 return xph_offset + (virtaddr - xph_vaddr);
966 }
967 return 0;
968 }
969
970 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)971 get_string_on_virtaddr(struct magic_set *ms,
972 int swap, int clazz, int fd, off_t ph_off, int ph_num,
973 off_t fsize, uint64_t virtaddr, char *buf, ssize_t buflen)
974 {
975 char *bptr;
976 off_t offset;
977
978 if (buflen == 0)
979 return 0;
980
981 offset = get_offset_from_virtaddr(ms, swap, clazz, fd, ph_off, ph_num,
982 fsize, virtaddr);
983 if (offset < 0 ||
984 (buflen = pread(fd, buf, CAST(size_t, buflen), offset)) <= 0) {
985 (void)file_printf(ms, ", can't read elf string at %jd",
986 (intmax_t)offset);
987 return 0;
988 }
989
990 buf[buflen - 1] = '\0';
991
992 /* We expect only printable characters, so return if buffer contains
993 * non-printable character before the '\0' or just '\0'. */
994 for (bptr = buf; *bptr && isprint(CAST(unsigned char, *bptr)); bptr++)
995 continue;
996 if (*bptr != '\0')
997 return 0;
998
999 return bptr - buf;
1000 }
1001
1002
1003 /*ARGSUSED*/
1004 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)1005 do_auxv_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type,
1006 int swap, uint32_t namesz __attribute__((__unused__)),
1007 uint32_t descsz __attribute__((__unused__)),
1008 size_t noff __attribute__((__unused__)), size_t doff,
1009 int *flags, size_t size __attribute__((__unused__)), int clazz,
1010 int fd, off_t ph_off, int ph_num, off_t fsize)
1011 {
1012 #ifdef ELFCORE
1013 Aux32Info auxv32;
1014 Aux64Info auxv64;
1015 size_t elsize = xauxv_sizeof;
1016 const char *tag;
1017 int is_string;
1018 size_t nval;
1019
1020 if ((*flags & (FLAGS_IS_CORE|FLAGS_DID_CORE_STYLE)) !=
1021 (FLAGS_IS_CORE|FLAGS_DID_CORE_STYLE))
1022 return 0;
1023
1024 switch (*flags & FLAGS_CORE_STYLE) {
1025 case OS_STYLE_SVR4:
1026 if (type != NT_AUXV)
1027 return 0;
1028 break;
1029 #ifdef notyet
1030 case OS_STYLE_NETBSD:
1031 if (type != NT_NETBSD_CORE_AUXV)
1032 return 0;
1033 break;
1034 case OS_STYLE_FREEBSD:
1035 if (type != NT_FREEBSD_PROCSTAT_AUXV)
1036 return 0;
1037 break;
1038 #endif
1039 default:
1040 return 0;
1041 }
1042
1043 *flags |= FLAGS_DID_AUXV;
1044
1045 nval = 0;
1046 for (size_t off = 0; off + elsize <= descsz; off += elsize) {
1047 memcpy(xauxv_addr, &nbuf[doff + off], xauxv_sizeof);
1048 /* Limit processing to 50 vector entries to prevent DoS */
1049 if (nval++ >= 50) {
1050 file_error(ms, 0, "Too many ELF Auxv elements");
1051 return 1;
1052 }
1053
1054 switch(xauxv_type) {
1055 case AT_LINUX_EXECFN:
1056 is_string = 1;
1057 tag = "execfn";
1058 break;
1059 case AT_LINUX_PLATFORM:
1060 is_string = 1;
1061 tag = "platform";
1062 break;
1063 case AT_LINUX_UID:
1064 is_string = 0;
1065 tag = "real uid";
1066 break;
1067 case AT_LINUX_GID:
1068 is_string = 0;
1069 tag = "real gid";
1070 break;
1071 case AT_LINUX_EUID:
1072 is_string = 0;
1073 tag = "effective uid";
1074 break;
1075 case AT_LINUX_EGID:
1076 is_string = 0;
1077 tag = "effective gid";
1078 break;
1079 default:
1080 is_string = 0;
1081 tag = NULL;
1082 break;
1083 }
1084
1085 if (tag == NULL)
1086 continue;
1087
1088 if (is_string) {
1089 char buf[256];
1090 ssize_t buflen;
1091 buflen = get_string_on_virtaddr(ms, swap, clazz, fd,
1092 ph_off, ph_num, fsize, xauxv_val, buf, sizeof(buf));
1093
1094 if (buflen == 0)
1095 continue;
1096
1097 if (file_printf(ms, ", %s: '%s'", tag, buf) == -1)
1098 return -1;
1099 } else {
1100 if (file_printf(ms, ", %s: %d", tag,
1101 CAST(int, xauxv_val)) == -1)
1102 return -1;
1103 }
1104 }
1105 return 1;
1106 #else
1107 return 0;
1108 #endif
1109 }
1110
1111 private size_t
dodynamic(struct magic_set * ms,void * vbuf,size_t offset,size_t size,int clazz,int swap,int * pie,size_t * need)1112 dodynamic(struct magic_set *ms, void *vbuf, size_t offset, size_t size,
1113 int clazz, int swap, int *pie, size_t *need)
1114 {
1115 Elf32_Dyn dh32;
1116 Elf64_Dyn dh64;
1117 unsigned char *dbuf = CAST(unsigned char *, vbuf);
1118
1119 if (xdh_sizeof + offset > size) {
1120 /*
1121 * We're out of note headers.
1122 */
1123 return xdh_sizeof + offset;
1124 }
1125
1126 memcpy(xdh_addr, &dbuf[offset], xdh_sizeof);
1127 offset += xdh_sizeof;
1128
1129 switch (xdh_tag) {
1130 case DT_FLAGS_1:
1131 *pie = 1;
1132 if (xdh_val & DF_1_PIE)
1133 ms->mode |= 0111;
1134 else
1135 ms->mode &= ~0111;
1136 break;
1137 case DT_NEEDED:
1138 (*need)++;
1139 break;
1140 default:
1141 break;
1142 }
1143 return offset;
1144 }
1145
1146
1147 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)1148 donote(struct magic_set *ms, void *vbuf, size_t offset, size_t size,
1149 int clazz, int swap, size_t align, int *flags, uint16_t *notecount,
1150 int fd, off_t ph_off, int ph_num, off_t fsize)
1151 {
1152 Elf32_Nhdr nh32;
1153 Elf64_Nhdr nh64;
1154 size_t noff, doff;
1155 uint32_t namesz, descsz;
1156 char buf[256];
1157 unsigned char *nbuf = CAST(unsigned char *, vbuf);
1158
1159 if (*notecount == 0)
1160 return 0;
1161 --*notecount;
1162
1163 if (xnh_sizeof + offset > size) {
1164 /*
1165 * We're out of note headers.
1166 */
1167 return xnh_sizeof + offset;
1168 }
1169 /*XXX: GCC */
1170 memset(&nh32, 0, sizeof(nh32));
1171 memset(&nh64, 0, sizeof(nh64));
1172
1173 memcpy(xnh_addr, &nbuf[offset], xnh_sizeof);
1174 offset += xnh_sizeof;
1175
1176 namesz = xnh_namesz;
1177 descsz = xnh_descsz;
1178
1179 if ((namesz == 0) && (descsz == 0)) {
1180 /*
1181 * We're out of note headers.
1182 */
1183 return (offset >= size) ? offset : size;
1184 }
1185
1186 if (namesz & 0x80000000) {
1187 (void)file_printf(ms, ", bad note name size %#lx",
1188 CAST(unsigned long, namesz));
1189 return 0;
1190 }
1191
1192 if (descsz & 0x80000000) {
1193 (void)file_printf(ms, ", bad note description size %#lx",
1194 CAST(unsigned long, descsz));
1195 return 0;
1196 }
1197
1198 noff = offset;
1199 doff = ELF_ALIGN(offset + namesz);
1200
1201 if (offset + namesz > size) {
1202 /*
1203 * We're past the end of the buffer.
1204 */
1205 return doff;
1206 }
1207
1208 offset = ELF_ALIGN(doff + descsz);
1209 if (doff + descsz > size) {
1210 /*
1211 * We're past the end of the buffer.
1212 */
1213 return (offset >= size) ? offset : size;
1214 }
1215
1216
1217 if ((*flags & FLAGS_DID_OS_NOTE) == 0) {
1218 if (do_os_note(ms, nbuf, xnh_type, swap,
1219 namesz, descsz, noff, doff, flags))
1220 return offset;
1221 }
1222
1223 if ((*flags & FLAGS_DID_BUILD_ID) == 0) {
1224 if (do_bid_note(ms, nbuf, xnh_type, swap,
1225 namesz, descsz, noff, doff, flags))
1226 return offset;
1227 }
1228
1229 if ((*flags & FLAGS_DID_NETBSD_PAX) == 0) {
1230 if (do_pax_note(ms, nbuf, xnh_type, swap,
1231 namesz, descsz, noff, doff, flags))
1232 return offset;
1233 }
1234
1235 if ((*flags & FLAGS_DID_CORE) == 0) {
1236 if (do_core_note(ms, nbuf, xnh_type, swap,
1237 namesz, descsz, noff, doff, flags, size, clazz))
1238 return offset;
1239 }
1240
1241 if ((*flags & FLAGS_DID_AUXV) == 0) {
1242 if (do_auxv_note(ms, nbuf, xnh_type, swap,
1243 namesz, descsz, noff, doff, flags, size, clazz,
1244 fd, ph_off, ph_num, fsize))
1245 return offset;
1246 }
1247
1248 if (namesz == 7 && strcmp(RCAST(char *, &nbuf[noff]), "NetBSD") == 0) {
1249 int descw, flag;
1250 const char *str, *tag;
1251 if (descsz > 100)
1252 descsz = 100;
1253 switch (xnh_type) {
1254 case NT_NETBSD_VERSION:
1255 return offset;
1256 case NT_NETBSD_MARCH:
1257 flag = FLAGS_DID_NETBSD_MARCH;
1258 tag = "compiled for";
1259 break;
1260 case NT_NETBSD_CMODEL:
1261 flag = FLAGS_DID_NETBSD_CMODEL;
1262 tag = "compiler model";
1263 break;
1264 case NT_NETBSD_EMULATION:
1265 flag = FLAGS_DID_NETBSD_EMULATION;
1266 tag = "emulation:";
1267 break;
1268 default:
1269 if (*flags & FLAGS_DID_NETBSD_UNKNOWN)
1270 return offset;
1271 *flags |= FLAGS_DID_NETBSD_UNKNOWN;
1272 if (file_printf(ms, ", note=%u", xnh_type) == -1)
1273 return offset;
1274 return offset;
1275 }
1276
1277 if (*flags & flag)
1278 return offset;
1279 str = RCAST(const char *, &nbuf[doff]);
1280 descw = CAST(int, descsz);
1281 *flags |= flag;
1282 file_printf(ms, ", %s: %s", tag,
1283 file_copystr(buf, sizeof(buf), descw, str));
1284 return offset;
1285 }
1286
1287 return offset;
1288 }
1289
1290 /* SunOS 5.x hardware capability descriptions */
1291 typedef struct cap_desc {
1292 uint64_t cd_mask;
1293 const char *cd_name;
1294 } cap_desc_t;
1295
1296 static const cap_desc_t cap_desc_sparc[] = {
1297 { AV_SPARC_MUL32, "MUL32" },
1298 { AV_SPARC_DIV32, "DIV32" },
1299 { AV_SPARC_FSMULD, "FSMULD" },
1300 { AV_SPARC_V8PLUS, "V8PLUS" },
1301 { AV_SPARC_POPC, "POPC" },
1302 { AV_SPARC_VIS, "VIS" },
1303 { AV_SPARC_VIS2, "VIS2" },
1304 { AV_SPARC_ASI_BLK_INIT, "ASI_BLK_INIT" },
1305 { AV_SPARC_FMAF, "FMAF" },
1306 { AV_SPARC_FJFMAU, "FJFMAU" },
1307 { AV_SPARC_IMA, "IMA" },
1308 { 0, NULL }
1309 };
1310
1311 static const cap_desc_t cap_desc_386[] = {
1312 { AV_386_FPU, "FPU" },
1313 { AV_386_TSC, "TSC" },
1314 { AV_386_CX8, "CX8" },
1315 { AV_386_SEP, "SEP" },
1316 { AV_386_AMD_SYSC, "AMD_SYSC" },
1317 { AV_386_CMOV, "CMOV" },
1318 { AV_386_MMX, "MMX" },
1319 { AV_386_AMD_MMX, "AMD_MMX" },
1320 { AV_386_AMD_3DNow, "AMD_3DNow" },
1321 { AV_386_AMD_3DNowx, "AMD_3DNowx" },
1322 { AV_386_FXSR, "FXSR" },
1323 { AV_386_SSE, "SSE" },
1324 { AV_386_SSE2, "SSE2" },
1325 { AV_386_PAUSE, "PAUSE" },
1326 { AV_386_SSE3, "SSE3" },
1327 { AV_386_MON, "MON" },
1328 { AV_386_CX16, "CX16" },
1329 { AV_386_AHF, "AHF" },
1330 { AV_386_TSCP, "TSCP" },
1331 { AV_386_AMD_SSE4A, "AMD_SSE4A" },
1332 { AV_386_POPCNT, "POPCNT" },
1333 { AV_386_AMD_LZCNT, "AMD_LZCNT" },
1334 { AV_386_SSSE3, "SSSE3" },
1335 { AV_386_SSE4_1, "SSE4.1" },
1336 { AV_386_SSE4_2, "SSE4.2" },
1337 { 0, NULL }
1338 };
1339
1340 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)1341 doshn(struct magic_set *ms, int clazz, int swap, int fd, off_t off, int num,
1342 size_t size, off_t fsize, int mach, int strtab, int *flags,
1343 uint16_t *notecount)
1344 {
1345 Elf32_Shdr sh32;
1346 Elf64_Shdr sh64;
1347 int stripped = 1, has_debug_info = 0;
1348 size_t nbadcap = 0;
1349 void *nbuf;
1350 off_t noff, coff, name_off, offs;
1351 uint64_t cap_hw1 = 0; /* SunOS 5.x hardware capabilities */
1352 uint64_t cap_sf1 = 0; /* SunOS 5.x software capabilities */
1353 char name[50];
1354 ssize_t namesize;
1355
1356 if (ms->flags & MAGIC_MIME)
1357 return 0;
1358
1359 if (num == 0) {
1360 if (file_printf(ms, ", no section header") == -1)
1361 return -1;
1362 return 0;
1363 }
1364 if (size != xsh_sizeof) {
1365 if (file_printf(ms, ", corrupted section header size") == -1)
1366 return -1;
1367 return 0;
1368 }
1369
1370 /* Read offset of name section to be able to read section names later */
1371 offs = CAST(off_t, (off + size * strtab));
1372 if (pread(fd, xsh_addr, xsh_sizeof, offs) < CAST(ssize_t, xsh_sizeof)) {
1373 if (file_printf(ms, ", missing section headers at %jd",
1374 (intmax_t)offs) == -1)
1375 return -1;
1376 return 0;
1377 }
1378 name_off = xsh_offset;
1379
1380 if (fsize != SIZE_UNKNOWN && fsize < name_off) {
1381 if (file_printf(ms, ", too large section header offset %jd",
1382 (intmax_t)name_off) == -1)
1383 return -1;
1384 return 0;
1385 }
1386
1387 for ( ; num; num--) {
1388 /* Read the name of this section. */
1389 offs = name_off + xsh_name;
1390 if ((namesize = pread(fd, name, sizeof(name) - 1, offs))
1391 == -1) {
1392 if (file_printf(ms,
1393 ", can't read name of elf section at %jd",
1394 (intmax_t)offs) == -1)
1395 return -1;
1396 return 0;
1397 }
1398 name[namesize] = '\0';
1399 if (strcmp(name, ".debug_info") == 0) {
1400 has_debug_info = 1;
1401 stripped = 0;
1402 }
1403
1404 if (pread(fd, xsh_addr, xsh_sizeof, off) <
1405 CAST(ssize_t, xsh_sizeof)) {
1406 if (file_printf(ms, ", can't read elf section at %jd",
1407 (intmax_t)off) == -1)
1408 return -1;
1409 return 0;
1410 }
1411 off += size;
1412
1413 /* Things we can determine before we seek */
1414 switch (xsh_type) {
1415 case SHT_SYMTAB:
1416 #if 0
1417 case SHT_DYNSYM:
1418 #endif
1419 stripped = 0;
1420 break;
1421 default:
1422 if (fsize != SIZE_UNKNOWN && xsh_offset > fsize) {
1423 /* Perhaps warn here */
1424 continue;
1425 }
1426 break;
1427 }
1428
1429
1430 /* Things we can determine when we seek */
1431 switch (xsh_type) {
1432 case SHT_NOTE:
1433 if (CAST(uintmax_t, (xsh_size + xsh_offset)) >
1434 CAST(uintmax_t, fsize)) {
1435 if (file_printf(ms,
1436 ", note offset/size %#" INTMAX_T_FORMAT
1437 "x+%#" INTMAX_T_FORMAT "x exceeds"
1438 " file size %#" INTMAX_T_FORMAT "x",
1439 CAST(uintmax_t, xsh_offset),
1440 CAST(uintmax_t, xsh_size),
1441 CAST(uintmax_t, fsize)) == -1)
1442 return -1;
1443 return 0;
1444 }
1445 if ((nbuf = malloc(xsh_size)) == NULL) {
1446 file_error(ms, errno, "Cannot allocate memory"
1447 " for note");
1448 return -1;
1449 }
1450 offs = xsh_offset;
1451 if (pread(fd, nbuf, xsh_size, offs) <
1452 CAST(ssize_t, xsh_size)) {
1453 free(nbuf);
1454 if (file_printf(ms,
1455 ", can't read elf note at %jd",
1456 (intmax_t)offs) == -1)
1457 return -1;
1458 return 0;
1459 }
1460
1461 noff = 0;
1462 for (;;) {
1463 if (noff >= CAST(off_t, xsh_size))
1464 break;
1465 noff = donote(ms, nbuf, CAST(size_t, noff),
1466 xsh_size, clazz, swap, 4, flags, notecount,
1467 fd, 0, 0, 0);
1468 if (noff == 0)
1469 break;
1470 }
1471 free(nbuf);
1472 break;
1473 case SHT_SUNW_cap:
1474 switch (mach) {
1475 case EM_SPARC:
1476 case EM_SPARCV9:
1477 case EM_IA_64:
1478 case EM_386:
1479 case EM_AMD64:
1480 break;
1481 default:
1482 goto skip;
1483 }
1484
1485 if (nbadcap > 5)
1486 break;
1487 if (lseek(fd, xsh_offset, SEEK_SET)
1488 == CAST(off_t, -1)) {
1489 file_badseek(ms);
1490 return -1;
1491 }
1492 coff = 0;
1493 for (;;) {
1494 Elf32_Cap cap32;
1495 Elf64_Cap cap64;
1496 char cbuf[/*CONSTCOND*/
1497 MAX(sizeof(cap32), sizeof(cap64))];
1498 if ((coff += xcap_sizeof) >
1499 CAST(off_t, xsh_size))
1500 break;
1501 if (read(fd, cbuf, CAST(size_t, xcap_sizeof)) !=
1502 CAST(ssize_t, xcap_sizeof)) {
1503 file_badread(ms);
1504 return -1;
1505 }
1506 if (cbuf[0] == 'A') {
1507 #ifdef notyet
1508 char *p = cbuf + 1;
1509 uint32_t len, tag;
1510 memcpy(&len, p, sizeof(len));
1511 p += 4;
1512 len = getu32(swap, len);
1513 if (memcmp("gnu", p, 3) != 0) {
1514 if (file_printf(ms,
1515 ", unknown capability %.3s", p)
1516 == -1)
1517 return -1;
1518 break;
1519 }
1520 p += strlen(p) + 1;
1521 tag = *p++;
1522 memcpy(&len, p, sizeof(len));
1523 p += 4;
1524 len = getu32(swap, len);
1525 if (tag != 1) {
1526 if (file_printf(ms, ", unknown gnu"
1527 " capability tag %d", tag)
1528 == -1)
1529 return -1;
1530 break;
1531 }
1532 // gnu attributes
1533 #endif
1534 break;
1535 }
1536 memcpy(xcap_addr, cbuf, xcap_sizeof);
1537 switch (xcap_tag) {
1538 case CA_SUNW_NULL:
1539 break;
1540 case CA_SUNW_HW_1:
1541 cap_hw1 |= xcap_val;
1542 break;
1543 case CA_SUNW_SF_1:
1544 cap_sf1 |= xcap_val;
1545 break;
1546 default:
1547 if (file_printf(ms,
1548 ", with unknown capability "
1549 "%#" INT64_T_FORMAT "x = %#"
1550 INT64_T_FORMAT "x",
1551 CAST(unsigned long long, xcap_tag),
1552 CAST(unsigned long long, xcap_val))
1553 == -1)
1554 return -1;
1555 if (nbadcap++ > 2)
1556 coff = xsh_size;
1557 break;
1558 }
1559 }
1560 /*FALLTHROUGH*/
1561 skip:
1562 default:
1563 break;
1564 }
1565 }
1566
1567 if (has_debug_info) {
1568 if (file_printf(ms, ", with debug_info") == -1)
1569 return -1;
1570 }
1571 if (file_printf(ms, ", %sstripped", stripped ? "" : "not ") == -1)
1572 return -1;
1573 if (cap_hw1) {
1574 const cap_desc_t *cdp;
1575 switch (mach) {
1576 case EM_SPARC:
1577 case EM_SPARC32PLUS:
1578 case EM_SPARCV9:
1579 cdp = cap_desc_sparc;
1580 break;
1581 case EM_386:
1582 case EM_IA_64:
1583 case EM_AMD64:
1584 cdp = cap_desc_386;
1585 break;
1586 default:
1587 cdp = NULL;
1588 break;
1589 }
1590 if (file_printf(ms, ", uses") == -1)
1591 return -1;
1592 if (cdp) {
1593 while (cdp->cd_name) {
1594 if (cap_hw1 & cdp->cd_mask) {
1595 if (file_printf(ms,
1596 " %s", cdp->cd_name) == -1)
1597 return -1;
1598 cap_hw1 &= ~cdp->cd_mask;
1599 }
1600 ++cdp;
1601 }
1602 if (cap_hw1)
1603 if (file_printf(ms,
1604 " unknown hardware capability %#"
1605 INT64_T_FORMAT "x",
1606 CAST(unsigned long long, cap_hw1)) == -1)
1607 return -1;
1608 } else {
1609 if (file_printf(ms,
1610 " hardware capability %#" INT64_T_FORMAT "x",
1611 CAST(unsigned long long, cap_hw1)) == -1)
1612 return -1;
1613 }
1614 }
1615 if (cap_sf1) {
1616 if (cap_sf1 & SF1_SUNW_FPUSED) {
1617 if (file_printf(ms,
1618 (cap_sf1 & SF1_SUNW_FPKNWN)
1619 ? ", uses frame pointer"
1620 : ", not known to use frame pointer") == -1)
1621 return -1;
1622 }
1623 cap_sf1 &= ~SF1_SUNW_MASK;
1624 if (cap_sf1)
1625 if (file_printf(ms,
1626 ", with unknown software capability %#"
1627 INT64_T_FORMAT "x",
1628 CAST(unsigned long long, cap_sf1)) == -1)
1629 return -1;
1630 }
1631 return 0;
1632 }
1633
1634 /*
1635 * Look through the program headers of an executable image, to determine
1636 * if it is statically or dynamically linked. If it has a dynamic section,
1637 * it is pie, and does not have an interpreter or needed libraries, we
1638 * call it static pie.
1639 */
1640 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)1641 dophn_exec(struct magic_set *ms, int clazz, int swap, int fd, off_t off,
1642 int num, size_t size, off_t fsize, int sh_num, int *flags,
1643 uint16_t *notecount)
1644 {
1645 Elf32_Phdr ph32;
1646 Elf64_Phdr ph64;
1647 const char *linking_style;
1648 unsigned char nbuf[BUFSIZ];
1649 char ibuf[BUFSIZ];
1650 char interp[BUFSIZ];
1651 ssize_t bufsize;
1652 size_t offset, align, len, need = 0;
1653 int pie = 0, dynamic = 0;
1654
1655 if (num == 0) {
1656 if (file_printf(ms, ", no program header") == -1)
1657 return -1;
1658 return 0;
1659 }
1660 if (size != xph_sizeof) {
1661 if (file_printf(ms, ", corrupted program header size") == -1)
1662 return -1;
1663 return 0;
1664 }
1665
1666 interp[0] = '\0';
1667 for ( ; num; num--) {
1668 int doread;
1669 if (pread(fd, xph_addr, xph_sizeof, off) <
1670 CAST(ssize_t, xph_sizeof)) {
1671 if (file_printf(ms,
1672 ", can't read elf program headers at %jd",
1673 (intmax_t)off) == -1)
1674 return -1;
1675 return 0;
1676 }
1677
1678 off += size;
1679 bufsize = 0;
1680 align = 4;
1681
1682 /* Things we can determine before we seek */
1683 switch (xph_type) {
1684 case PT_DYNAMIC:
1685 doread = 1;
1686 break;
1687 case PT_NOTE:
1688 if (sh_num) /* Did this through section headers */
1689 continue;
1690 if (((align = xph_align) & 0x80000000UL) != 0 ||
1691 align < 4) {
1692 if (file_printf(ms,
1693 ", invalid note alignment %#lx",
1694 CAST(unsigned long, align)) == -1)
1695 return -1;
1696 align = 4;
1697 }
1698 /*FALLTHROUGH*/
1699 case PT_INTERP:
1700 doread = 1;
1701 break;
1702 default:
1703 doread = 0;
1704 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) {
1705 /* Maybe warn here? */
1706 continue;
1707 }
1708 break;
1709 }
1710
1711 if (doread) {
1712 len = xph_filesz < sizeof(nbuf) ? xph_filesz
1713 : sizeof(nbuf);
1714 off_t offs = xph_offset;
1715 bufsize = pread(fd, nbuf, len, offs);
1716 if (bufsize == -1) {
1717 if (file_printf(ms,
1718 ", can't read section at %jd",
1719 (intmax_t)offs) == -1)
1720 return -1;
1721 return 0;
1722 }
1723 } else
1724 len = 0;
1725
1726 /* Things we can determine when we seek */
1727 switch (xph_type) {
1728 case PT_DYNAMIC:
1729 dynamic = 1;
1730 offset = 0;
1731 // Let DF_1 determine if we are PIE or not.
1732 ms->mode &= ~0111;
1733 for (;;) {
1734 if (offset >= CAST(size_t, bufsize))
1735 break;
1736 offset = dodynamic(ms, nbuf, offset,
1737 CAST(size_t, bufsize), clazz, swap,
1738 &pie, &need);
1739 if (offset == 0)
1740 break;
1741 }
1742 if (ms->flags & MAGIC_MIME)
1743 continue;
1744 break;
1745
1746 case PT_INTERP:
1747 need++;
1748 if (ms->flags & MAGIC_MIME)
1749 continue;
1750 if (bufsize && nbuf[0]) {
1751 nbuf[bufsize - 1] = '\0';
1752 memcpy(interp, nbuf, CAST(size_t, bufsize));
1753 } else
1754 strlcpy(interp, "*empty*", sizeof(interp));
1755 break;
1756 case PT_NOTE:
1757 if (ms->flags & MAGIC_MIME)
1758 return 0;
1759 /*
1760 * This is a PT_NOTE section; loop through all the notes
1761 * in the section.
1762 */
1763 offset = 0;
1764 for (;;) {
1765 if (offset >= CAST(size_t, bufsize))
1766 break;
1767 offset = donote(ms, nbuf, offset,
1768 CAST(size_t, bufsize), clazz, swap, align,
1769 flags, notecount, fd, 0, 0, 0);
1770 if (offset == 0)
1771 break;
1772 }
1773 break;
1774 default:
1775 if (ms->flags & MAGIC_MIME)
1776 continue;
1777 break;
1778 }
1779 }
1780 if (ms->flags & MAGIC_MIME)
1781 return 0;
1782 if (dynamic) {
1783 if (pie && need == 0)
1784 linking_style = "static-pie";
1785 else
1786 linking_style = "dynamically";
1787 } else {
1788 linking_style = "statically";
1789 }
1790 if (file_printf(ms, ", %s linked", linking_style) == -1)
1791 return -1;
1792 if (interp[0])
1793 if (file_printf(ms, ", interpreter %s", file_printable(ms,
1794 ibuf, sizeof(ibuf), interp, sizeof(interp))) == -1)
1795 return -1;
1796 return 0;
1797 }
1798
1799
1800 protected int
file_tryelf(struct magic_set * ms,const struct buffer * b)1801 file_tryelf(struct magic_set *ms, const struct buffer *b)
1802 {
1803 int fd = b->fd;
1804 const unsigned char *buf = CAST(const unsigned char *, b->fbuf);
1805 size_t nbytes = b->flen;
1806 union {
1807 int32_t l;
1808 char c[sizeof(int32_t)];
1809 } u;
1810 int clazz;
1811 int swap;
1812 struct stat st;
1813 const struct stat *stp;
1814 off_t fsize;
1815 int flags = 0;
1816 Elf32_Ehdr elf32hdr;
1817 Elf64_Ehdr elf64hdr;
1818 uint16_t type, phnum, shnum, notecount;
1819
1820 if (ms->flags & (MAGIC_APPLE|MAGIC_EXTENSION))
1821 return 0;
1822 /*
1823 * ELF executables have multiple section headers in arbitrary
1824 * file locations and thus file(1) cannot determine it from easily.
1825 * Instead we traverse thru all section headers until a symbol table
1826 * one is found or else the binary is stripped.
1827 * Return immediately if it's not ELF (so we avoid pipe2file unless
1828 * needed).
1829 */
1830 if (buf[EI_MAG0] != ELFMAG0
1831 || (buf[EI_MAG1] != ELFMAG1 && buf[EI_MAG1] != OLFMAG1)
1832 || buf[EI_MAG2] != ELFMAG2 || buf[EI_MAG3] != ELFMAG3)
1833 return 0;
1834
1835 /*
1836 * If we cannot seek, it must be a pipe, socket or fifo.
1837 */
1838 if((lseek(fd, CAST(off_t, 0), SEEK_SET) == CAST(off_t, -1))
1839 && (errno == ESPIPE))
1840 fd = file_pipe2file(ms, fd, buf, nbytes);
1841
1842 if (fd == -1) {
1843 file_badread(ms);
1844 return -1;
1845 }
1846
1847 stp = &b->st;
1848 /*
1849 * b->st.st_size != 0 if previous fstat() succeeded,
1850 * which is likely, we can avoid extra stat() call.
1851 */
1852 if (b->st.st_size == 0) {
1853 stp = &st;
1854 if (fstat(fd, &st) == -1) {
1855 file_badread(ms);
1856 return -1;
1857 }
1858 }
1859 if (S_ISREG(stp->st_mode) || stp->st_size != 0)
1860 fsize = stp->st_size;
1861 else
1862 fsize = SIZE_UNKNOWN;
1863
1864 clazz = buf[EI_CLASS];
1865
1866 switch (clazz) {
1867 case ELFCLASS32:
1868 #undef elf_getu
1869 #define elf_getu(a, b) elf_getu32(a, b)
1870 #undef elfhdr
1871 #define elfhdr elf32hdr
1872 #include "elfclass.h"
1873 case ELFCLASS64:
1874 #undef elf_getu
1875 #define elf_getu(a, b) elf_getu64(a, b)
1876 #undef elfhdr
1877 #define elfhdr elf64hdr
1878 #include "elfclass.h"
1879 default:
1880 if (file_printf(ms, ", unknown class %d", clazz) == -1)
1881 return -1;
1882 break;
1883 }
1884 return 0;
1885 }
1886 #endif
1887