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 1.190 2023/07/27 19:39:06 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 file_private int dophn_core(struct magic_set *, int, int, int, off_t, int,
46 size_t, off_t, int *, uint16_t *);
47 #endif
48 file_private int dophn_exec(struct magic_set *, int, int, int, off_t, int,
49 size_t, off_t, int, int *, uint16_t *);
50 file_private int doshn(struct magic_set *, int, int, int, off_t, int, size_t,
51 off_t, int, int, int *, uint16_t *);
52 file_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 file_private uint16_t getu16(int, uint16_t);
60 file_private uint32_t getu32(int, uint32_t);
61 file_private uint64_t getu64(int, uint64_t);
62
63 #define SIZE_UNKNOWN CAST(off_t, -1)
64
65 file_private int
toomany(struct magic_set * ms,const char * name,uint16_t num)66 toomany(struct magic_set *ms, const char *name, uint16_t num)
67 {
68 if (ms->flags & MAGIC_MIME)
69 return 1;
70 if (file_printf(ms, ", too many %s (%u)", name, num) == -1)
71 return -1;
72 return 1;
73 }
74
75 file_private uint16_t
getu16(int swap,uint16_t value)76 getu16(int swap, uint16_t value)
77 {
78 union {
79 uint16_t ui;
80 char c[2];
81 } retval, tmpval;
82
83 if (swap) {
84 tmpval.ui = value;
85
86 retval.c[0] = tmpval.c[1];
87 retval.c[1] = tmpval.c[0];
88
89 return retval.ui;
90 } else
91 return value;
92 }
93
94 file_private uint32_t
getu32(int swap,uint32_t value)95 getu32(int swap, uint32_t value)
96 {
97 union {
98 uint32_t ui;
99 char c[4];
100 } retval, tmpval;
101
102 if (swap) {
103 tmpval.ui = value;
104
105 retval.c[0] = tmpval.c[3];
106 retval.c[1] = tmpval.c[2];
107 retval.c[2] = tmpval.c[1];
108 retval.c[3] = tmpval.c[0];
109
110 return retval.ui;
111 } else
112 return value;
113 }
114
115 file_private uint64_t
getu64(int swap,uint64_t value)116 getu64(int swap, uint64_t value)
117 {
118 union {
119 uint64_t ui;
120 char c[8];
121 } retval, tmpval;
122
123 if (swap) {
124 tmpval.ui = value;
125
126 retval.c[0] = tmpval.c[7];
127 retval.c[1] = tmpval.c[6];
128 retval.c[2] = tmpval.c[5];
129 retval.c[3] = tmpval.c[4];
130 retval.c[4] = tmpval.c[3];
131 retval.c[5] = tmpval.c[2];
132 retval.c[6] = tmpval.c[1];
133 retval.c[7] = tmpval.c[0];
134
135 return retval.ui;
136 } else
137 return value;
138 }
139
140 #define elf_getu16(swap, value) getu16(swap, value)
141 #define elf_getu32(swap, value) getu32(swap, value)
142 #define elf_getu64(swap, value) getu64(swap, value)
143
144 #define xsh_addr (clazz == ELFCLASS32 \
145 ? CAST(void *, &sh32) \
146 : CAST(void *, &sh64))
147 #define xsh_sizeof (clazz == ELFCLASS32 \
148 ? sizeof(sh32) \
149 : sizeof(sh64))
150 #define xsh_size CAST(size_t, (clazz == ELFCLASS32 \
151 ? elf_getu32(swap, sh32.sh_size) \
152 : elf_getu64(swap, sh64.sh_size)))
153 #define xsh_offset CAST(off_t, (clazz == ELFCLASS32 \
154 ? elf_getu32(swap, sh32.sh_offset) \
155 : elf_getu64(swap, sh64.sh_offset)))
156 #define xsh_type (clazz == ELFCLASS32 \
157 ? elf_getu32(swap, sh32.sh_type) \
158 : elf_getu32(swap, sh64.sh_type))
159 #define xsh_name (clazz == ELFCLASS32 \
160 ? elf_getu32(swap, sh32.sh_name) \
161 : elf_getu32(swap, sh64.sh_name))
162
163 #define xph_addr (clazz == ELFCLASS32 \
164 ? CAST(void *, &ph32) \
165 : CAST(void *, &ph64))
166 #define xph_sizeof (clazz == ELFCLASS32 \
167 ? sizeof(ph32) \
168 : sizeof(ph64))
169 #define xph_type (clazz == ELFCLASS32 \
170 ? elf_getu32(swap, ph32.p_type) \
171 : elf_getu32(swap, ph64.p_type))
172 #define xph_offset CAST(off_t, (clazz == ELFCLASS32 \
173 ? elf_getu32(swap, ph32.p_offset) \
174 : elf_getu64(swap, ph64.p_offset)))
175 #define xph_align CAST(size_t, (clazz == ELFCLASS32 \
176 ? CAST(off_t, (ph32.p_align ? \
177 elf_getu32(swap, ph32.p_align) : 4))\
178 : CAST(off_t, (ph64.p_align ? \
179 elf_getu64(swap, ph64.p_align) : 4))))
180 #define xph_vaddr CAST(size_t, (clazz == ELFCLASS32 \
181 ? CAST(off_t, (ph32.p_vaddr ? \
182 elf_getu32(swap, ph32.p_vaddr) : 4))\
183 : CAST(off_t, (ph64.p_vaddr ? \
184 elf_getu64(swap, ph64.p_vaddr) : 4))))
185 #define xph_filesz CAST(size_t, (clazz == ELFCLASS32 \
186 ? elf_getu32(swap, ph32.p_filesz) \
187 : elf_getu64(swap, ph64.p_filesz)))
188 #define xph_memsz CAST(size_t, ((clazz == ELFCLASS32 \
189 ? elf_getu32(swap, ph32.p_memsz) \
190 : elf_getu64(swap, ph64.p_memsz))))
191 #define xnh_addr (clazz == ELFCLASS32 \
192 ? CAST(void *, &nh32) \
193 : CAST(void *, &nh64))
194 #define xnh_sizeof (clazz == ELFCLASS32 \
195 ? sizeof(nh32) \
196 : sizeof(nh64))
197 #define xnh_type (clazz == ELFCLASS32 \
198 ? elf_getu32(swap, nh32.n_type) \
199 : elf_getu32(swap, nh64.n_type))
200 #define xnh_namesz (clazz == ELFCLASS32 \
201 ? elf_getu32(swap, nh32.n_namesz) \
202 : elf_getu32(swap, nh64.n_namesz))
203 #define xnh_descsz (clazz == ELFCLASS32 \
204 ? elf_getu32(swap, nh32.n_descsz) \
205 : elf_getu32(swap, nh64.n_descsz))
206
207 #define xdh_addr (clazz == ELFCLASS32 \
208 ? CAST(void *, &dh32) \
209 : CAST(void *, &dh64))
210 #define xdh_sizeof (clazz == ELFCLASS32 \
211 ? sizeof(dh32) \
212 : sizeof(dh64))
213 #define xdh_tag (clazz == ELFCLASS32 \
214 ? elf_getu32(swap, dh32.d_tag) \
215 : elf_getu64(swap, dh64.d_tag))
216 #define xdh_val (clazz == ELFCLASS32 \
217 ? elf_getu32(swap, dh32.d_un.d_val) \
218 : elf_getu64(swap, dh64.d_un.d_val))
219
220 #define xcap_addr (clazz == ELFCLASS32 \
221 ? CAST(void *, &cap32) \
222 : CAST(void *, &cap64))
223 #define xcap_sizeof (clazz == ELFCLASS32 \
224 ? sizeof(cap32) \
225 : sizeof(cap64))
226 #define xcap_tag (clazz == ELFCLASS32 \
227 ? elf_getu32(swap, cap32.c_tag) \
228 : elf_getu64(swap, cap64.c_tag))
229 #define xcap_val (clazz == ELFCLASS32 \
230 ? elf_getu32(swap, cap32.c_un.c_val) \
231 : elf_getu64(swap, cap64.c_un.c_val))
232
233 #define xauxv_addr (clazz == ELFCLASS32 \
234 ? CAST(void *, &auxv32) \
235 : CAST(void *, &auxv64))
236 #define xauxv_sizeof (clazz == ELFCLASS32 \
237 ? sizeof(auxv32) \
238 : sizeof(auxv64))
239 #define xauxv_type (clazz == ELFCLASS32 \
240 ? elf_getu32(swap, auxv32.a_type) \
241 : elf_getu64(swap, auxv64.a_type))
242 #define xauxv_val (clazz == ELFCLASS32 \
243 ? elf_getu32(swap, auxv32.a_v) \
244 : elf_getu64(swap, auxv64.a_v))
245
246 #define prpsoffsets(i) (clazz == ELFCLASS32 \
247 ? prpsoffsets32[i] \
248 : prpsoffsets64[i])
249
250 #ifdef ELFCORE
251 /*
252 * Try larger offsets first to avoid false matches
253 * from earlier data that happen to look like strings.
254 */
255 static const size_t prpsoffsets32[] = {
256 #ifdef USE_NT_PSINFO
257 104, /* SunOS 5.x (command line) */
258 88, /* SunOS 5.x (short name) */
259 #endif /* USE_NT_PSINFO */
260
261 100, /* SunOS 5.x (command line) */
262 84, /* SunOS 5.x (short name) */
263
264 44, /* Linux (command line) */
265 28, /* Linux (short name) */
266
267 48, /* Linux PowerPC (command line) */
268 32, /* Linux PowerPC (short name) */
269
270 8, /* FreeBSD */
271 };
272
273 static const size_t prpsoffsets64[] = {
274 #ifdef USE_NT_PSINFO
275 152, /* SunOS 5.x (command line) */
276 136, /* SunOS 5.x (short name) */
277 #endif /* USE_NT_PSINFO */
278
279 136, /* SunOS 5.x, 64-bit (command line) */
280 120, /* SunOS 5.x, 64-bit (short name) */
281
282 56, /* Linux (command line) */
283 40, /* Linux (tested on core from 2.4.x, short name) */
284
285 16, /* FreeBSD, 64-bit */
286 };
287
288 #define NOFFSETS32 __arraycount(prpsoffsets32)
289 #define NOFFSETS64 __arraycount(prpsoffsets64)
290
291 #define NOFFSETS (clazz == ELFCLASS32 ? NOFFSETS32 : NOFFSETS64)
292
293 /*
294 * Look through the program headers of an executable image, searching
295 * for a PT_NOTE section of type NT_PRPSINFO, with a name "CORE" or
296 * "FreeBSD"; if one is found, try looking in various places in its
297 * contents for a 16-character string containing only printable
298 * characters - if found, that string should be the name of the program
299 * that dropped core. Note: right after that 16-character string is,
300 * at least in SunOS 5.x (and possibly other SVR4-flavored systems) and
301 * Linux, a longer string (80 characters, in 5.x, probably other
302 * SVR4-flavored systems, and Linux) containing the start of the
303 * command line for that program.
304 *
305 * SunOS 5.x core files contain two PT_NOTE sections, with the types
306 * NT_PRPSINFO (old) and NT_PSINFO (new). These structs contain the
307 * same info about the command name and command line, so it probably
308 * isn't worthwhile to look for NT_PSINFO, but the offsets are provided
309 * above (see USE_NT_PSINFO), in case we ever decide to do so. The
310 * NT_PRPSINFO and NT_PSINFO sections are always in order and adjacent;
311 * the SunOS 5.x file command relies on this (and prefers the latter).
312 *
313 * The signal number probably appears in a section of type NT_PRSTATUS,
314 * but that's also rather OS-dependent, in ways that are harder to
315 * dissect with heuristics, so I'm not bothering with the signal number.
316 * (I suppose the signal number could be of interest in situations where
317 * you don't have the binary of the program that dropped core; if you
318 * *do* have that binary, the debugger will probably tell you what
319 * signal it was.)
320 */
321
322 #define OS_STYLE_SVR4 0
323 #define OS_STYLE_FREEBSD 1
324 #define OS_STYLE_NETBSD 2
325
326 file_private const char os_style_names[][8] = {
327 "SVR4",
328 "FreeBSD",
329 "NetBSD",
330 };
331
332 #define FLAGS_CORE_STYLE 0x0003
333
334 #define FLAGS_DID_CORE 0x0004
335 #define FLAGS_DID_OS_NOTE 0x0008
336 #define FLAGS_DID_BUILD_ID 0x0010
337 #define FLAGS_DID_CORE_STYLE 0x0020
338 #define FLAGS_DID_NETBSD_PAX 0x0040
339 #define FLAGS_DID_NETBSD_MARCH 0x0080
340 #define FLAGS_DID_NETBSD_CMODEL 0x0100
341 #define FLAGS_DID_NETBSD_EMULATION 0x0200
342 #define FLAGS_DID_NETBSD_UNKNOWN 0x0400
343 #define FLAGS_IS_CORE 0x0800
344 #define FLAGS_DID_AUXV 0x1000
345
346 file_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)347 dophn_core(struct magic_set *ms, int clazz, int swap, int fd, off_t off,
348 int num, size_t size, off_t fsize, int *flags, uint16_t *notecount)
349 {
350 Elf32_Phdr ph32;
351 Elf64_Phdr ph64;
352 size_t offset, len;
353 unsigned char nbuf[BUFSIZ];
354 ssize_t bufsize;
355 off_t ph_off = off, offs;
356 int ph_num = num;
357
358 if (ms->flags & MAGIC_MIME)
359 return 0;
360
361 if (num == 0) {
362 if (file_printf(ms, ", no program header") == -1)
363 return -1;
364 return 0;
365 }
366 if (size != xph_sizeof) {
367 if (file_printf(ms, ", corrupted program header size") == -1)
368 return -1;
369 return 0;
370 }
371
372 /*
373 * Loop through all the program headers.
374 */
375 for ( ; num; num--) {
376 if (pread(fd, xph_addr, xph_sizeof, off) <
377 CAST(ssize_t, xph_sizeof)) {
378 if (file_printf(ms,
379 ", can't read elf program headers at %jd",
380 (intmax_t)off) == -1)
381 return -1;
382 return 0;
383 }
384 off += size;
385
386 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) {
387 /* Perhaps warn here */
388 continue;
389 }
390
391 if (xph_type != PT_NOTE)
392 continue;
393
394 /*
395 * This is a PT_NOTE section; loop through all the notes
396 * in the section.
397 */
398 len = xph_filesz < sizeof(nbuf) ? xph_filesz : sizeof(nbuf);
399 offs = xph_offset;
400 if ((bufsize = pread(fd, nbuf, len, offs)) == -1) {
401 if (file_printf(ms, " can't read note section at %jd",
402 (intmax_t)offs) == -1)
403 return -1;
404 return 0;
405 }
406 offset = 0;
407 for (;;) {
408 if (offset >= CAST(size_t, bufsize))
409 break;
410 offset = donote(ms, nbuf, offset, CAST(size_t, bufsize),
411 clazz, swap, 4, flags, notecount, fd, ph_off,
412 ph_num, fsize);
413 if (offset == 0)
414 break;
415
416 }
417 }
418 return 0;
419 }
420 #endif
421
422 static int
do_note_netbsd_version(struct magic_set * ms,int swap,void * v)423 do_note_netbsd_version(struct magic_set *ms, int swap, void *v)
424 {
425 uint32_t desc;
426 memcpy(&desc, v, sizeof(desc));
427 desc = elf_getu32(swap, desc);
428
429 if (file_printf(ms, ", for NetBSD") == -1)
430 return -1;
431 /*
432 * The version number used to be stuck as 199905, and was thus
433 * basically content-free. Newer versions of NetBSD have fixed
434 * this and now use the encoding of __NetBSD_Version__:
435 *
436 * MMmmrrpp00
437 *
438 * M = major version
439 * m = minor version
440 * r = release ["",A-Z,Z[A-Z] but numeric]
441 * p = patchlevel
442 */
443 if (desc > 100000000U) {
444 uint32_t ver_patch = (desc / 100) % 100;
445 uint32_t ver_rel = (desc / 10000) % 100;
446 uint32_t ver_min = (desc / 1000000) % 100;
447 uint32_t ver_maj = desc / 100000000;
448
449 if (file_printf(ms, " %u.%u", ver_maj, ver_min) == -1)
450 return -1;
451 if (ver_maj >= 9) {
452 ver_patch += 100 * ver_rel;
453 ver_rel = 0;
454 }
455 if (ver_rel == 0 && ver_patch != 0) {
456 if (file_printf(ms, ".%u", ver_patch) == -1)
457 return -1;
458 } else if (ver_rel != 0) {
459 while (ver_rel > 26) {
460 if (file_printf(ms, "Z") == -1)
461 return -1;
462 ver_rel -= 26;
463 }
464 if (file_printf(ms, "%c", 'A' + ver_rel - 1) == -1)
465 return -1;
466 }
467 }
468 return 0;
469 }
470
471 static int
do_note_freebsd_version(struct magic_set * ms,int swap,void * v)472 do_note_freebsd_version(struct magic_set *ms, int swap, void *v)
473 {
474 uint32_t desc;
475
476 memcpy(&desc, v, sizeof(desc));
477 desc = elf_getu32(swap, desc);
478 if (file_printf(ms, ", for FreeBSD") == -1)
479 return -1;
480
481 /*
482 * Contents is __FreeBSD_version, whose relation to OS
483 * versions is defined by a huge table in the Porter's
484 * Handbook. This is the general scheme:
485 *
486 * Releases:
487 * Mmp000 (before 4.10)
488 * Mmi0p0 (before 5.0)
489 * Mmm0p0
490 *
491 * Development branches:
492 * Mmpxxx (before 4.6)
493 * Mmp1xx (before 4.10)
494 * Mmi1xx (before 5.0)
495 * M000xx (pre-M.0)
496 * Mmm1xx
497 *
498 * M = major version
499 * m = minor version
500 * i = minor version increment (491000 -> 4.10)
501 * p = patchlevel
502 * x = revision
503 *
504 * The first release of FreeBSD to use ELF by default
505 * was version 3.0.
506 */
507 if (desc == 460002) {
508 if (file_printf(ms, " 4.6.2") == -1)
509 return -1;
510 } else if (desc < 460100) {
511 if (file_printf(ms, " %d.%d", desc / 100000,
512 desc / 10000 % 10) == -1)
513 return -1;
514 if (desc / 1000 % 10 > 0)
515 if (file_printf(ms, ".%d", desc / 1000 % 10) == -1)
516 return -1;
517 if ((desc % 1000 > 0) || (desc % 100000 == 0))
518 if (file_printf(ms, " (%d)", desc) == -1)
519 return -1;
520 } else if (desc < 500000) {
521 if (file_printf(ms, " %d.%d", desc / 100000,
522 desc / 10000 % 10 + desc / 1000 % 10) == -1)
523 return -1;
524 if (desc / 100 % 10 > 0) {
525 if (file_printf(ms, " (%d)", desc) == -1)
526 return -1;
527 } else if (desc / 10 % 10 > 0) {
528 if (file_printf(ms, ".%d", desc / 10 % 10) == -1)
529 return -1;
530 }
531 } else {
532 if (file_printf(ms, " %d.%d", desc / 100000,
533 desc / 1000 % 100) == -1)
534 return -1;
535 if ((desc / 100 % 10 > 0) ||
536 (desc % 100000 / 100 == 0)) {
537 if (file_printf(ms, " (%d)", desc) == -1)
538 return -1;
539 } else if (desc / 10 % 10 > 0) {
540 if (file_printf(ms, ".%d", desc / 10 % 10) == -1)
541 return -1;
542 }
543 }
544 return 0;
545 }
546
547 file_private int
548 /*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)549 do_bid_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type,
550 int swap __attribute__((__unused__)), uint32_t namesz, uint32_t descsz,
551 size_t noff, size_t doff, int *flags)
552 {
553 if (namesz == 4 && strcmp(RCAST(char *, &nbuf[noff]), "GNU") == 0 &&
554 type == NT_GNU_BUILD_ID && (descsz >= 4 && descsz <= 20)) {
555 uint8_t desc[20];
556 const char *btype;
557 uint32_t i;
558 *flags |= FLAGS_DID_BUILD_ID;
559 switch (descsz) {
560 case 8:
561 btype = "xxHash";
562 break;
563 case 16:
564 btype = "md5/uuid";
565 break;
566 case 20:
567 btype = "sha1";
568 break;
569 default:
570 btype = "unknown";
571 break;
572 }
573 if (file_printf(ms, ", BuildID[%s]=", btype) == -1)
574 return -1;
575 memcpy(desc, &nbuf[doff], descsz);
576 for (i = 0; i < descsz; i++)
577 if (file_printf(ms, "%02x", desc[i]) == -1)
578 return -1;
579 return 1;
580 }
581 if (namesz == 4 && strcmp(RCAST(char *, &nbuf[noff]), "Go") == 0 &&
582 type == NT_GO_BUILD_ID && descsz < 128) {
583 char buf[256];
584 if (file_printf(ms, ", Go BuildID=%s",
585 file_copystr(buf, sizeof(buf), descsz,
586 RCAST(const char *, &nbuf[doff]))) == -1)
587 return -1;
588 return 1;
589 }
590 return 0;
591 }
592
593 file_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)594 do_os_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type,
595 int swap, uint32_t namesz, uint32_t descsz,
596 size_t noff, size_t doff, int *flags)
597 {
598 const char *name = RCAST(const char *, &nbuf[noff]);
599
600 if (namesz == 5 && strcmp(name, "SuSE") == 0 &&
601 type == NT_GNU_VERSION && descsz == 2) {
602 *flags |= FLAGS_DID_OS_NOTE;
603 if (file_printf(ms, ", for SuSE %d.%d", nbuf[doff],
604 nbuf[doff + 1]) == -1)
605 return -1;
606 return 1;
607 }
608
609 if (namesz == 4 && strcmp(name, "GNU") == 0 &&
610 type == NT_GNU_VERSION && descsz == 16) {
611 uint32_t desc[4];
612 memcpy(desc, &nbuf[doff], sizeof(desc));
613
614 *flags |= FLAGS_DID_OS_NOTE;
615 if (file_printf(ms, ", for GNU/") == -1)
616 return -1;
617 switch (elf_getu32(swap, desc[0])) {
618 case GNU_OS_LINUX:
619 if (file_printf(ms, "Linux") == -1)
620 return -1;
621 break;
622 case GNU_OS_HURD:
623 if (file_printf(ms, "Hurd") == -1)
624 return -1;
625 break;
626 case GNU_OS_SOLARIS:
627 if (file_printf(ms, "Solaris") == -1)
628 return -1;
629 break;
630 case GNU_OS_KFREEBSD:
631 if (file_printf(ms, "kFreeBSD") == -1)
632 return -1;
633 break;
634 case GNU_OS_KNETBSD:
635 if (file_printf(ms, "kNetBSD") == -1)
636 return -1;
637 break;
638 default:
639 if (file_printf(ms, "<unknown>") == -1)
640 return -1;
641 }
642 if (file_printf(ms, " %d.%d.%d", elf_getu32(swap, desc[1]),
643 elf_getu32(swap, desc[2]), elf_getu32(swap, desc[3])) == -1)
644 return -1;
645 return 1;
646 }
647
648 if (namesz == 7 && strcmp(name, "NetBSD") == 0) {
649 if (type == NT_NETBSD_VERSION && descsz == 4) {
650 *flags |= FLAGS_DID_OS_NOTE;
651 if (do_note_netbsd_version(ms, swap, &nbuf[doff]) == -1)
652 return -1;
653 return 1;
654 }
655 }
656
657 if (namesz == 8 && strcmp(name, "FreeBSD") == 0) {
658 if (type == NT_FREEBSD_VERSION && descsz == 4) {
659 *flags |= FLAGS_DID_OS_NOTE;
660 if (do_note_freebsd_version(ms, swap, &nbuf[doff])
661 == -1)
662 return -1;
663 return 1;
664 }
665 }
666
667 if (namesz == 8 && strcmp(name, "OpenBSD") == 0 &&
668 type == NT_OPENBSD_VERSION && descsz == 4) {
669 *flags |= FLAGS_DID_OS_NOTE;
670 if (file_printf(ms, ", for OpenBSD") == -1)
671 return -1;
672 /* Content of note is always 0 */
673 return 1;
674 }
675
676 if (namesz == 10 && strcmp(name, "DragonFly") == 0 &&
677 type == NT_DRAGONFLY_VERSION && descsz == 4) {
678 uint32_t desc;
679 *flags |= FLAGS_DID_OS_NOTE;
680 if (file_printf(ms, ", for DragonFly") == -1)
681 return -1;
682 memcpy(&desc, &nbuf[doff], sizeof(desc));
683 desc = elf_getu32(swap, desc);
684 if (file_printf(ms, " %d.%d.%d", desc / 100000,
685 desc / 10000 % 10, desc % 10000) == -1)
686 return -1;
687 return 1;
688 }
689 return 0;
690 }
691
692 file_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)693 do_pax_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type,
694 int swap, uint32_t namesz, uint32_t descsz,
695 size_t noff, size_t doff, int *flags)
696 {
697 const char *name = RCAST(const char *, &nbuf[noff]);
698
699 if (namesz == 4 && strcmp(name, "PaX") == 0 &&
700 type == NT_NETBSD_PAX && descsz == 4) {
701 static const char *pax[] = {
702 "+mprotect",
703 "-mprotect",
704 "+segvguard",
705 "-segvguard",
706 "+ASLR",
707 "-ASLR",
708 };
709 uint32_t desc;
710 size_t i;
711 int did = 0;
712
713 *flags |= FLAGS_DID_NETBSD_PAX;
714 memcpy(&desc, &nbuf[doff], sizeof(desc));
715 desc = elf_getu32(swap, desc);
716
717 if (desc && file_printf(ms, ", PaX: ") == -1)
718 return -1;
719
720 for (i = 0; i < __arraycount(pax); i++) {
721 if (((1 << CAST(int, i)) & desc) == 0)
722 continue;
723 if (file_printf(ms, "%s%s", did++ ? "," : "",
724 pax[i]) == -1)
725 return -1;
726 }
727 return 1;
728 }
729 return 0;
730 }
731
732 file_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)733 do_core_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type,
734 int swap, uint32_t namesz, uint32_t descsz,
735 size_t noff, size_t doff, int *flags, size_t size, int clazz)
736 {
737 #ifdef ELFCORE
738 char buf[256];
739 const char *name = RCAST(const char *, &nbuf[noff]);
740
741 int os_style = -1;
742 /*
743 * Sigh. The 2.0.36 kernel in Debian 2.1, at
744 * least, doesn't correctly implement name
745 * sections, in core dumps, as specified by
746 * the "Program Linking" section of "UNIX(R) System
747 * V Release 4 Programmer's Guide: ANSI C and
748 * Programming Support Tools", because my copy
749 * clearly says "The first 'namesz' bytes in 'name'
750 * contain a *null-terminated* [emphasis mine]
751 * character representation of the entry's owner
752 * or originator", but the 2.0.36 kernel code
753 * doesn't include the terminating null in the
754 * name....
755 */
756 if ((namesz == 4 && strncmp(name, "CORE", 4) == 0) ||
757 (namesz == 5 && strcmp(name, "CORE") == 0)) {
758 os_style = OS_STYLE_SVR4;
759 }
760
761 if ((namesz == 8 && strcmp(name, "FreeBSD") == 0)) {
762 os_style = OS_STYLE_FREEBSD;
763 }
764
765 if ((namesz >= 11 && strncmp(name, "NetBSD-CORE", 11)
766 == 0)) {
767 os_style = OS_STYLE_NETBSD;
768 }
769
770 if (os_style != -1 && (*flags & FLAGS_DID_CORE_STYLE) == 0) {
771 if (file_printf(ms, ", %s-style", os_style_names[os_style])
772 == -1)
773 return -1;
774 *flags |= FLAGS_DID_CORE_STYLE;
775 *flags |= os_style;
776 }
777
778 switch (os_style) {
779 case OS_STYLE_NETBSD:
780 if (type == NT_NETBSD_CORE_PROCINFO) {
781 char sbuf[512];
782 struct NetBSD_elfcore_procinfo pi;
783 memset(&pi, 0, sizeof(pi));
784 memcpy(&pi, nbuf + doff, MIN(descsz, sizeof(pi)));
785
786 if (file_printf(ms, ", from '%.31s', pid=%u, uid=%u, "
787 "gid=%u, nlwps=%u, lwp=%u (signal %u/code %u)",
788 file_printable(ms, sbuf, sizeof(sbuf),
789 RCAST(char *, pi.cpi_name), sizeof(pi.cpi_name)),
790 elf_getu32(swap, CAST(uint32_t, pi.cpi_pid)),
791 elf_getu32(swap, pi.cpi_euid),
792 elf_getu32(swap, pi.cpi_egid),
793 elf_getu32(swap, pi.cpi_nlwps),
794 elf_getu32(swap, CAST(uint32_t, pi.cpi_siglwp)),
795 elf_getu32(swap, pi.cpi_signo),
796 elf_getu32(swap, pi.cpi_sigcode)) == -1)
797 return -1;
798
799 *flags |= FLAGS_DID_CORE;
800 return 1;
801 }
802 break;
803
804 case OS_STYLE_FREEBSD:
805 if (type == NT_PRPSINFO && *flags & FLAGS_IS_CORE) {
806 size_t argoff, pidoff;
807
808 if (clazz == ELFCLASS32)
809 argoff = 4 + 4 + 17;
810 else
811 argoff = 4 + 4 + 8 + 17;
812 if (file_printf(ms, ", from '%.80s'", nbuf + doff +
813 argoff) == -1)
814 return -1;
815 pidoff = argoff + 81 + 2;
816 if (doff + pidoff + 4 <= size) {
817 if (file_printf(ms, ", pid=%u",
818 elf_getu32(swap, *RCAST(uint32_t *, (nbuf +
819 doff + pidoff)))) == -1)
820 return -1;
821 }
822 *flags |= FLAGS_DID_CORE;
823 }
824 break;
825
826 default:
827 if (type == NT_PRPSINFO && *flags & FLAGS_IS_CORE) {
828 size_t i, j;
829 unsigned char c;
830 /*
831 * Extract the program name. We assume
832 * it to be 16 characters (that's what it
833 * is in SunOS 5.x and Linux).
834 *
835 * Unfortunately, it's at a different offset
836 * in various OSes, so try multiple offsets.
837 * If the characters aren't all printable,
838 * reject it.
839 */
840 for (i = 0; i < NOFFSETS; i++) {
841 unsigned char *cname, *cp;
842 size_t reloffset = prpsoffsets(i);
843 size_t noffset = doff + reloffset;
844 size_t k;
845 for (j = 0; j < 16; j++, noffset++,
846 reloffset++) {
847 /*
848 * Make sure we're not past
849 * the end of the buffer; if
850 * we are, just give up.
851 */
852 if (noffset >= size)
853 goto tryanother;
854
855 /*
856 * Make sure we're not past
857 * the end of the contents;
858 * if we are, this obviously
859 * isn't the right offset.
860 */
861 if (reloffset >= descsz)
862 goto tryanother;
863
864 c = nbuf[noffset];
865 if (c == '\0') {
866 /*
867 * A '\0' at the
868 * beginning is
869 * obviously wrong.
870 * Any other '\0'
871 * means we're done.
872 */
873 if (j == 0)
874 goto tryanother;
875 else
876 break;
877 } else {
878 /*
879 * A nonprintable
880 * character is also
881 * wrong.
882 */
883 if (!isprint(c) || isquote(c))
884 goto tryanother;
885 }
886 }
887 /*
888 * Well, that worked.
889 */
890
891 /*
892 * Try next offsets, in case this match is
893 * in the middle of a string.
894 */
895 for (k = i + 1 ; k < NOFFSETS; k++) {
896 size_t no;
897 int adjust = 1;
898 if (prpsoffsets(k) >= prpsoffsets(i))
899 continue;
900 /*
901 * pr_fname == pr_psargs - 16 &&
902 * non-nul-terminated fname (qemu)
903 */
904 if (prpsoffsets(k) ==
905 prpsoffsets(i) - 16 && j == 16)
906 continue;
907 for (no = doff + prpsoffsets(k);
908 no < doff + prpsoffsets(i); no++)
909 adjust = adjust
910 && isprint(nbuf[no]);
911 if (adjust)
912 i = k;
913 }
914
915 cname = CAST(unsigned char *,
916 &nbuf[doff + prpsoffsets(i)]);
917 for (cp = cname; cp < nbuf + size && *cp
918 && isprint(*cp); cp++)
919 continue;
920 /*
921 * Linux apparently appends a space at the end
922 * of the command line: remove it.
923 */
924 while (cp > cname && isspace(cp[-1]))
925 cp--;
926 if (file_printf(ms, ", from '%s'",
927 file_copystr(buf, sizeof(buf),
928 CAST(size_t, cp - cname),
929 RCAST(char *, cname))) == -1)
930 return -1;
931 *flags |= FLAGS_DID_CORE;
932 return 1;
933
934 tryanother:
935 ;
936 }
937 }
938 break;
939 }
940 #endif
941 return 0;
942 }
943
944 file_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)945 get_offset_from_virtaddr(struct magic_set *ms, int swap, int clazz, int fd,
946 off_t off, int num, off_t fsize, uint64_t virtaddr)
947 {
948 Elf32_Phdr ph32;
949 Elf64_Phdr ph64;
950
951 /*
952 * Loop through all the program headers and find the header with
953 * virtual address in which the "virtaddr" belongs to.
954 */
955 for ( ; num; num--) {
956 if (pread(fd, xph_addr, xph_sizeof, off) <
957 CAST(ssize_t, xph_sizeof)) {
958 if (file_printf(ms,
959 ", can't read elf program header at %jd",
960 (intmax_t)off) == -1)
961 return -1;
962 return 0;
963
964 }
965 off += xph_sizeof;
966
967 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) {
968 /* Perhaps warn here */
969 continue;
970 }
971
972 if (virtaddr >= xph_vaddr && virtaddr < xph_vaddr + xph_filesz)
973 return xph_offset + (virtaddr - xph_vaddr);
974 }
975 return 0;
976 }
977
978 file_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)979 get_string_on_virtaddr(struct magic_set *ms,
980 int swap, int clazz, int fd, off_t ph_off, int ph_num,
981 off_t fsize, uint64_t virtaddr, char *buf, ssize_t buflen)
982 {
983 char *bptr;
984 off_t offset;
985
986 if (buflen == 0)
987 return 0;
988
989 offset = get_offset_from_virtaddr(ms, swap, clazz, fd, ph_off, ph_num,
990 fsize, virtaddr);
991 if (offset < 0 ||
992 (buflen = pread(fd, buf, CAST(size_t, buflen), offset)) <= 0) {
993 (void)file_printf(ms, ", can't read elf string at %jd",
994 (intmax_t)offset);
995 return 0;
996 }
997
998 buf[buflen - 1] = '\0';
999
1000 /* We expect only printable characters, so return if buffer contains
1001 * non-printable character before the '\0' or just '\0'. */
1002 for (bptr = buf; *bptr && isprint(CAST(unsigned char, *bptr)); bptr++)
1003 continue;
1004 if (*bptr != '\0')
1005 return 0;
1006
1007 return bptr - buf;
1008 }
1009
1010
1011 /*ARGSUSED*/
1012 file_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)1013 do_auxv_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type,
1014 int swap, uint32_t namesz __attribute__((__unused__)),
1015 uint32_t descsz __attribute__((__unused__)),
1016 size_t noff __attribute__((__unused__)), size_t doff,
1017 int *flags, size_t size __attribute__((__unused__)), int clazz,
1018 int fd, off_t ph_off, int ph_num, off_t fsize)
1019 {
1020 #ifdef ELFCORE
1021 Aux32Info auxv32;
1022 Aux64Info auxv64;
1023 size_t elsize = xauxv_sizeof;
1024 const char *tag;
1025 int is_string;
1026 size_t nval, off;
1027
1028 if ((*flags & (FLAGS_IS_CORE|FLAGS_DID_CORE_STYLE)) !=
1029 (FLAGS_IS_CORE|FLAGS_DID_CORE_STYLE))
1030 return 0;
1031
1032 switch (*flags & FLAGS_CORE_STYLE) {
1033 case OS_STYLE_SVR4:
1034 if (type != NT_AUXV)
1035 return 0;
1036 break;
1037 #ifdef notyet
1038 case OS_STYLE_NETBSD:
1039 if (type != NT_NETBSD_CORE_AUXV)
1040 return 0;
1041 break;
1042 case OS_STYLE_FREEBSD:
1043 if (type != NT_FREEBSD_PROCSTAT_AUXV)
1044 return 0;
1045 break;
1046 #endif
1047 default:
1048 return 0;
1049 }
1050
1051 *flags |= FLAGS_DID_AUXV;
1052
1053 nval = 0;
1054 for (off = 0; off + elsize <= descsz; off += elsize) {
1055 memcpy(xauxv_addr, &nbuf[doff + off], xauxv_sizeof);
1056 /* Limit processing to 50 vector entries to prevent DoS */
1057 if (nval++ >= 50) {
1058 file_error(ms, 0, "Too many ELF Auxv elements");
1059 return 1;
1060 }
1061
1062 switch(xauxv_type) {
1063 case AT_LINUX_EXECFN:
1064 is_string = 1;
1065 tag = "execfn";
1066 break;
1067 case AT_LINUX_PLATFORM:
1068 is_string = 1;
1069 tag = "platform";
1070 break;
1071 case AT_LINUX_UID:
1072 is_string = 0;
1073 tag = "real uid";
1074 break;
1075 case AT_LINUX_GID:
1076 is_string = 0;
1077 tag = "real gid";
1078 break;
1079 case AT_LINUX_EUID:
1080 is_string = 0;
1081 tag = "effective uid";
1082 break;
1083 case AT_LINUX_EGID:
1084 is_string = 0;
1085 tag = "effective gid";
1086 break;
1087 default:
1088 is_string = 0;
1089 tag = NULL;
1090 break;
1091 }
1092
1093 if (tag == NULL)
1094 continue;
1095
1096 if (is_string) {
1097 char buf[256];
1098 ssize_t buflen;
1099 buflen = get_string_on_virtaddr(ms, swap, clazz, fd,
1100 ph_off, ph_num, fsize, xauxv_val, buf, sizeof(buf));
1101
1102 if (buflen == 0)
1103 continue;
1104
1105 if (file_printf(ms, ", %s: '%s'", tag, buf) == -1)
1106 return -1;
1107 } else {
1108 if (file_printf(ms, ", %s: %d", tag,
1109 CAST(int, xauxv_val)) == -1)
1110 return -1;
1111 }
1112 }
1113 return 1;
1114 #else
1115 return 0;
1116 #endif
1117 }
1118
1119 file_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)1120 dodynamic(struct magic_set *ms, void *vbuf, size_t offset, size_t size,
1121 int clazz, int swap, int *pie, size_t *need)
1122 {
1123 Elf32_Dyn dh32;
1124 Elf64_Dyn dh64;
1125 unsigned char *dbuf = CAST(unsigned char *, vbuf);
1126
1127 if (xdh_sizeof + offset > size) {
1128 /*
1129 * We're out of note headers.
1130 */
1131 return xdh_sizeof + offset;
1132 }
1133
1134 memcpy(xdh_addr, &dbuf[offset], xdh_sizeof);
1135 offset += xdh_sizeof;
1136
1137 switch (xdh_tag) {
1138 case DT_FLAGS_1:
1139 *pie = 1;
1140 if (xdh_val & DF_1_PIE)
1141 ms->mode |= 0111;
1142 else
1143 ms->mode &= ~0111;
1144 break;
1145 case DT_NEEDED:
1146 (*need)++;
1147 break;
1148 default:
1149 break;
1150 }
1151 return offset;
1152 }
1153
1154
1155 file_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)1156 donote(struct magic_set *ms, void *vbuf, size_t offset, size_t size,
1157 int clazz, int swap, size_t align, int *flags, uint16_t *notecount,
1158 int fd, off_t ph_off, int ph_num, off_t fsize)
1159 {
1160 Elf32_Nhdr nh32;
1161 Elf64_Nhdr nh64;
1162 size_t noff, doff;
1163 uint32_t namesz, descsz;
1164 char buf[256];
1165 unsigned char *nbuf = CAST(unsigned char *, vbuf);
1166
1167 if (*notecount == 0)
1168 return 0;
1169 --*notecount;
1170
1171 if (xnh_sizeof + offset > size) {
1172 /*
1173 * We're out of note headers.
1174 */
1175 return xnh_sizeof + offset;
1176 }
1177 /*XXX: GCC */
1178 memset(&nh32, 0, sizeof(nh32));
1179 memset(&nh64, 0, sizeof(nh64));
1180
1181 memcpy(xnh_addr, &nbuf[offset], xnh_sizeof);
1182 offset += xnh_sizeof;
1183
1184 namesz = xnh_namesz;
1185 descsz = xnh_descsz;
1186
1187 if ((namesz == 0) && (descsz == 0)) {
1188 /*
1189 * We're out of note headers.
1190 */
1191 return (offset >= size) ? offset : size;
1192 }
1193
1194 if (namesz & 0x80000000) {
1195 (void)file_printf(ms, ", bad note name size %#lx",
1196 CAST(unsigned long, namesz));
1197 return 0;
1198 }
1199
1200 if (descsz & 0x80000000) {
1201 (void)file_printf(ms, ", bad note description size %#lx",
1202 CAST(unsigned long, descsz));
1203 return 0;
1204 }
1205
1206 noff = offset;
1207 doff = ELF_ALIGN(offset + namesz);
1208
1209 if (offset + namesz > size) {
1210 /*
1211 * We're past the end of the buffer.
1212 */
1213 return doff;
1214 }
1215
1216 offset = ELF_ALIGN(doff + descsz);
1217 if (doff + descsz > size) {
1218 /*
1219 * We're past the end of the buffer.
1220 */
1221 return (offset >= size) ? offset : size;
1222 }
1223
1224
1225 if ((*flags & FLAGS_DID_OS_NOTE) == 0) {
1226 if (do_os_note(ms, nbuf, xnh_type, swap,
1227 namesz, descsz, noff, doff, flags))
1228 return offset;
1229 }
1230
1231 if ((*flags & FLAGS_DID_BUILD_ID) == 0) {
1232 if (do_bid_note(ms, nbuf, xnh_type, swap,
1233 namesz, descsz, noff, doff, flags))
1234 return offset;
1235 }
1236
1237 if ((*flags & FLAGS_DID_NETBSD_PAX) == 0) {
1238 if (do_pax_note(ms, nbuf, xnh_type, swap,
1239 namesz, descsz, noff, doff, flags))
1240 return offset;
1241 }
1242
1243 if ((*flags & FLAGS_DID_CORE) == 0) {
1244 if (do_core_note(ms, nbuf, xnh_type, swap,
1245 namesz, descsz, noff, doff, flags, size, clazz))
1246 return offset;
1247 }
1248
1249 if ((*flags & FLAGS_DID_AUXV) == 0) {
1250 if (do_auxv_note(ms, nbuf, xnh_type, swap,
1251 namesz, descsz, noff, doff, flags, size, clazz,
1252 fd, ph_off, ph_num, fsize))
1253 return offset;
1254 }
1255
1256 if (namesz == 7 && strcmp(RCAST(char *, &nbuf[noff]), "NetBSD") == 0) {
1257 int descw, flag;
1258 const char *str, *tag;
1259 if (descsz > 100)
1260 descsz = 100;
1261 switch (xnh_type) {
1262 case NT_NETBSD_VERSION:
1263 return offset;
1264 case NT_NETBSD_MARCH:
1265 flag = FLAGS_DID_NETBSD_MARCH;
1266 tag = "compiled for";
1267 break;
1268 case NT_NETBSD_CMODEL:
1269 flag = FLAGS_DID_NETBSD_CMODEL;
1270 tag = "compiler model";
1271 break;
1272 case NT_NETBSD_EMULATION:
1273 flag = FLAGS_DID_NETBSD_EMULATION;
1274 tag = "emulation:";
1275 break;
1276 default:
1277 if (*flags & FLAGS_DID_NETBSD_UNKNOWN)
1278 return offset;
1279 *flags |= FLAGS_DID_NETBSD_UNKNOWN;
1280 if (file_printf(ms, ", note=%u", xnh_type) == -1)
1281 return offset;
1282 return offset;
1283 }
1284
1285 if (*flags & flag)
1286 return offset;
1287 str = RCAST(const char *, &nbuf[doff]);
1288 descw = CAST(int, descsz);
1289 *flags |= flag;
1290 file_printf(ms, ", %s: %s", tag,
1291 file_copystr(buf, sizeof(buf), descw, str));
1292 return offset;
1293 }
1294
1295 return offset;
1296 }
1297
1298 /* SunOS 5.x hardware capability descriptions */
1299 typedef struct cap_desc {
1300 uint64_t cd_mask;
1301 const char *cd_name;
1302 } cap_desc_t;
1303
1304 static const cap_desc_t cap_desc_sparc[] = {
1305 { AV_SPARC_MUL32, "MUL32" },
1306 { AV_SPARC_DIV32, "DIV32" },
1307 { AV_SPARC_FSMULD, "FSMULD" },
1308 { AV_SPARC_V8PLUS, "V8PLUS" },
1309 { AV_SPARC_POPC, "POPC" },
1310 { AV_SPARC_VIS, "VIS" },
1311 { AV_SPARC_VIS2, "VIS2" },
1312 { AV_SPARC_ASI_BLK_INIT, "ASI_BLK_INIT" },
1313 { AV_SPARC_FMAF, "FMAF" },
1314 { AV_SPARC_FJFMAU, "FJFMAU" },
1315 { AV_SPARC_IMA, "IMA" },
1316 { 0, NULL }
1317 };
1318
1319 static const cap_desc_t cap_desc_386[] = {
1320 { AV_386_FPU, "FPU" },
1321 { AV_386_TSC, "TSC" },
1322 { AV_386_CX8, "CX8" },
1323 { AV_386_SEP, "SEP" },
1324 { AV_386_AMD_SYSC, "AMD_SYSC" },
1325 { AV_386_CMOV, "CMOV" },
1326 { AV_386_MMX, "MMX" },
1327 { AV_386_AMD_MMX, "AMD_MMX" },
1328 { AV_386_AMD_3DNow, "AMD_3DNow" },
1329 { AV_386_AMD_3DNowx, "AMD_3DNowx" },
1330 { AV_386_FXSR, "FXSR" },
1331 { AV_386_SSE, "SSE" },
1332 { AV_386_SSE2, "SSE2" },
1333 { AV_386_PAUSE, "PAUSE" },
1334 { AV_386_SSE3, "SSE3" },
1335 { AV_386_MON, "MON" },
1336 { AV_386_CX16, "CX16" },
1337 { AV_386_AHF, "AHF" },
1338 { AV_386_TSCP, "TSCP" },
1339 { AV_386_AMD_SSE4A, "AMD_SSE4A" },
1340 { AV_386_POPCNT, "POPCNT" },
1341 { AV_386_AMD_LZCNT, "AMD_LZCNT" },
1342 { AV_386_SSSE3, "SSSE3" },
1343 { AV_386_SSE4_1, "SSE4.1" },
1344 { AV_386_SSE4_2, "SSE4.2" },
1345 { 0, NULL }
1346 };
1347
1348 file_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)1349 doshn(struct magic_set *ms, int clazz, int swap, int fd, off_t off, int num,
1350 size_t size, off_t fsize, int mach, int strtab, int *flags,
1351 uint16_t *notecount)
1352 {
1353 Elf32_Shdr sh32;
1354 Elf64_Shdr sh64;
1355 int stripped = 1, has_debug_info = 0;
1356 size_t nbadcap = 0;
1357 void *nbuf;
1358 off_t noff, coff, name_off, offs;
1359 uint64_t cap_hw1 = 0; /* SunOS 5.x hardware capabilities */
1360 uint64_t cap_sf1 = 0; /* SunOS 5.x software capabilities */
1361 char name[50];
1362 ssize_t namesize;
1363
1364 if (ms->flags & MAGIC_MIME)
1365 return 0;
1366
1367 if (num == 0) {
1368 if (file_printf(ms, ", no section header") == -1)
1369 return -1;
1370 return 0;
1371 }
1372 if (size != xsh_sizeof) {
1373 if (file_printf(ms, ", corrupted section header size") == -1)
1374 return -1;
1375 return 0;
1376 }
1377
1378 /* Read offset of name section to be able to read section names later */
1379 offs = CAST(off_t, (off + size * strtab));
1380 if (pread(fd, xsh_addr, xsh_sizeof, offs) < CAST(ssize_t, xsh_sizeof)) {
1381 if (file_printf(ms, ", missing section headers at %jd",
1382 (intmax_t)offs) == -1)
1383 return -1;
1384 return 0;
1385 }
1386 name_off = xsh_offset;
1387
1388 if (fsize != SIZE_UNKNOWN && fsize < name_off) {
1389 if (file_printf(ms, ", too large section header offset %jd",
1390 (intmax_t)name_off) == -1)
1391 return -1;
1392 return 0;
1393 }
1394
1395 for ( ; num; num--) {
1396 /* Read the name of this section. */
1397 offs = name_off + xsh_name;
1398 if ((namesize = pread(fd, name, sizeof(name) - 1, offs))
1399 == -1) {
1400 if (file_printf(ms,
1401 ", can't read name of elf section at %jd",
1402 (intmax_t)offs) == -1)
1403 return -1;
1404 return 0;
1405 }
1406 name[namesize] = '\0';
1407 if (strcmp(name, ".debug_info") == 0) {
1408 has_debug_info = 1;
1409 stripped = 0;
1410 }
1411
1412 if (pread(fd, xsh_addr, xsh_sizeof, off) <
1413 CAST(ssize_t, xsh_sizeof)) {
1414 if (file_printf(ms, ", can't read elf section at %jd",
1415 (intmax_t)off) == -1)
1416 return -1;
1417 return 0;
1418 }
1419 off += size;
1420
1421 /* Things we can determine before we seek */
1422 switch (xsh_type) {
1423 case SHT_SYMTAB:
1424 #if 0
1425 case SHT_DYNSYM:
1426 #endif
1427 stripped = 0;
1428 break;
1429 default:
1430 if (fsize != SIZE_UNKNOWN && xsh_offset > fsize) {
1431 /* Perhaps warn here */
1432 continue;
1433 }
1434 break;
1435 }
1436
1437
1438 /* Things we can determine when we seek */
1439 switch (xsh_type) {
1440 case SHT_NOTE:
1441 if (CAST(uintmax_t, (xsh_size + xsh_offset)) >
1442 CAST(uintmax_t, fsize)) {
1443 if (file_printf(ms,
1444 ", note offset/size %#" INTMAX_T_FORMAT
1445 "x+%#" INTMAX_T_FORMAT "x exceeds"
1446 " file size %#" INTMAX_T_FORMAT "x",
1447 CAST(uintmax_t, xsh_offset),
1448 CAST(uintmax_t, xsh_size),
1449 CAST(uintmax_t, fsize)) == -1)
1450 return -1;
1451 return 0;
1452 }
1453 if (xsh_size > ms->elf_shsize_max) {
1454 file_error(ms, errno, "Note section size too "
1455 "big (%ju > %zu)", (uintmax_t)xsh_size,
1456 ms->elf_shsize_max);
1457 return -1;
1458 }
1459 if ((nbuf = malloc(xsh_size)) == NULL) {
1460 file_error(ms, errno, "Cannot allocate memory"
1461 " for note");
1462 return -1;
1463 }
1464 offs = xsh_offset;
1465 if (pread(fd, nbuf, xsh_size, offs) <
1466 CAST(ssize_t, xsh_size)) {
1467 free(nbuf);
1468 if (file_printf(ms,
1469 ", can't read elf note at %jd",
1470 (intmax_t)offs) == -1)
1471 return -1;
1472 return 0;
1473 }
1474
1475 noff = 0;
1476 for (;;) {
1477 if (noff >= CAST(off_t, xsh_size))
1478 break;
1479 noff = donote(ms, nbuf, CAST(size_t, noff),
1480 xsh_size, clazz, swap, 4, flags, notecount,
1481 fd, 0, 0, 0);
1482 if (noff == 0)
1483 break;
1484 }
1485 free(nbuf);
1486 break;
1487 case SHT_SUNW_cap:
1488 switch (mach) {
1489 case EM_SPARC:
1490 case EM_SPARCV9:
1491 case EM_IA_64:
1492 case EM_386:
1493 case EM_AMD64:
1494 break;
1495 default:
1496 goto skip;
1497 }
1498
1499 if (nbadcap > 5)
1500 break;
1501 if (lseek(fd, xsh_offset, SEEK_SET)
1502 == CAST(off_t, -1)) {
1503 file_badseek(ms);
1504 return -1;
1505 }
1506 coff = 0;
1507 for (;;) {
1508 Elf32_Cap cap32;
1509 Elf64_Cap cap64;
1510 char cbuf[/*CONSTCOND*/
1511 MAX(sizeof(cap32), sizeof(cap64))];
1512 if ((coff += xcap_sizeof) >
1513 CAST(off_t, xsh_size))
1514 break;
1515 if (read(fd, cbuf, CAST(size_t, xcap_sizeof)) !=
1516 CAST(ssize_t, xcap_sizeof)) {
1517 file_badread(ms);
1518 return -1;
1519 }
1520 if (cbuf[0] == 'A') {
1521 #ifdef notyet
1522 char *p = cbuf + 1;
1523 uint32_t len, tag;
1524 memcpy(&len, p, sizeof(len));
1525 p += 4;
1526 len = getu32(swap, len);
1527 if (memcmp("gnu", p, 3) != 0) {
1528 if (file_printf(ms,
1529 ", unknown capability %.3s", p)
1530 == -1)
1531 return -1;
1532 break;
1533 }
1534 p += strlen(p) + 1;
1535 tag = *p++;
1536 memcpy(&len, p, sizeof(len));
1537 p += 4;
1538 len = getu32(swap, len);
1539 if (tag != 1) {
1540 if (file_printf(ms, ", unknown gnu"
1541 " capability tag %d", tag)
1542 == -1)
1543 return -1;
1544 break;
1545 }
1546 // gnu attributes
1547 #endif
1548 break;
1549 }
1550 memcpy(xcap_addr, cbuf, xcap_sizeof);
1551 switch (xcap_tag) {
1552 case CA_SUNW_NULL:
1553 break;
1554 case CA_SUNW_HW_1:
1555 cap_hw1 |= xcap_val;
1556 break;
1557 case CA_SUNW_SF_1:
1558 cap_sf1 |= xcap_val;
1559 break;
1560 default:
1561 if (file_printf(ms,
1562 ", with unknown capability "
1563 "%#" INT64_T_FORMAT "x = %#"
1564 INT64_T_FORMAT "x",
1565 CAST(unsigned long long, xcap_tag),
1566 CAST(unsigned long long, xcap_val))
1567 == -1)
1568 return -1;
1569 if (nbadcap++ > 2)
1570 coff = xsh_size;
1571 break;
1572 }
1573 }
1574 /*FALLTHROUGH*/
1575 skip:
1576 default:
1577 break;
1578 }
1579 }
1580
1581 if (has_debug_info) {
1582 if (file_printf(ms, ", with debug_info") == -1)
1583 return -1;
1584 }
1585 if (file_printf(ms, ", %sstripped", stripped ? "" : "not ") == -1)
1586 return -1;
1587 if (cap_hw1) {
1588 const cap_desc_t *cdp;
1589 switch (mach) {
1590 case EM_SPARC:
1591 case EM_SPARC32PLUS:
1592 case EM_SPARCV9:
1593 cdp = cap_desc_sparc;
1594 break;
1595 case EM_386:
1596 case EM_IA_64:
1597 case EM_AMD64:
1598 cdp = cap_desc_386;
1599 break;
1600 default:
1601 cdp = NULL;
1602 break;
1603 }
1604 if (file_printf(ms, ", uses") == -1)
1605 return -1;
1606 if (cdp) {
1607 while (cdp->cd_name) {
1608 if (cap_hw1 & cdp->cd_mask) {
1609 if (file_printf(ms,
1610 " %s", cdp->cd_name) == -1)
1611 return -1;
1612 cap_hw1 &= ~cdp->cd_mask;
1613 }
1614 ++cdp;
1615 }
1616 if (cap_hw1)
1617 if (file_printf(ms,
1618 " unknown hardware capability %#"
1619 INT64_T_FORMAT "x",
1620 CAST(unsigned long long, cap_hw1)) == -1)
1621 return -1;
1622 } else {
1623 if (file_printf(ms,
1624 " hardware capability %#" INT64_T_FORMAT "x",
1625 CAST(unsigned long long, cap_hw1)) == -1)
1626 return -1;
1627 }
1628 }
1629 if (cap_sf1) {
1630 if (cap_sf1 & SF1_SUNW_FPUSED) {
1631 if (file_printf(ms,
1632 (cap_sf1 & SF1_SUNW_FPKNWN)
1633 ? ", uses frame pointer"
1634 : ", not known to use frame pointer") == -1)
1635 return -1;
1636 }
1637 cap_sf1 &= ~SF1_SUNW_MASK;
1638 if (cap_sf1)
1639 if (file_printf(ms,
1640 ", with unknown software capability %#"
1641 INT64_T_FORMAT "x",
1642 CAST(unsigned long long, cap_sf1)) == -1)
1643 return -1;
1644 }
1645 return 0;
1646 }
1647
1648 /*
1649 * Look through the program headers of an executable image, to determine
1650 * if it is statically or dynamically linked. If it has a dynamic section,
1651 * it is pie, and does not have an interpreter or needed libraries, we
1652 * call it static pie.
1653 */
1654 file_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)1655 dophn_exec(struct magic_set *ms, int clazz, int swap, int fd, off_t off,
1656 int num, size_t size, off_t fsize, int sh_num, int *flags,
1657 uint16_t *notecount)
1658 {
1659 Elf32_Phdr ph32;
1660 Elf64_Phdr ph64;
1661 const char *linking_style;
1662 unsigned char nbuf[BUFSIZ];
1663 char ibuf[BUFSIZ];
1664 char interp[BUFSIZ];
1665 ssize_t bufsize;
1666 size_t offset, align, need = 0;
1667 int pie = 0, dynamic = 0;
1668
1669 if (num == 0) {
1670 if (file_printf(ms, ", no program header") == -1)
1671 return -1;
1672 return 0;
1673 }
1674 if (size != xph_sizeof) {
1675 if (file_printf(ms, ", corrupted program header size") == -1)
1676 return -1;
1677 return 0;
1678 }
1679
1680 interp[0] = '\0';
1681 for ( ; num; num--) {
1682 int doread;
1683 if (pread(fd, xph_addr, xph_sizeof, off) <
1684 CAST(ssize_t, xph_sizeof)) {
1685 if (file_printf(ms,
1686 ", can't read elf program headers at %jd",
1687 (intmax_t)off) == -1)
1688 return -1;
1689 return 0;
1690 }
1691
1692 off += size;
1693 bufsize = 0;
1694 align = 4;
1695
1696 /* Things we can determine before we seek */
1697 switch (xph_type) {
1698 case PT_DYNAMIC:
1699 doread = 1;
1700 break;
1701 case PT_NOTE:
1702 if (sh_num) /* Did this through section headers */
1703 continue;
1704 if (((align = xph_align) & 0x80000000UL) != 0 ||
1705 align < 4) {
1706 if (file_printf(ms,
1707 ", invalid note alignment %#lx",
1708 CAST(unsigned long, align)) == -1)
1709 return -1;
1710 align = 4;
1711 }
1712 /*FALLTHROUGH*/
1713 case PT_INTERP:
1714 doread = 1;
1715 break;
1716 default:
1717 doread = 0;
1718 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) {
1719 /* Maybe warn here? */
1720 continue;
1721 }
1722 break;
1723 }
1724
1725 if (doread) {
1726 size_t len = xph_filesz < sizeof(nbuf) ? xph_filesz
1727 : sizeof(nbuf);
1728 off_t offs = xph_offset;
1729 bufsize = pread(fd, nbuf, len, offs);
1730 if (bufsize == -1) {
1731 if (file_printf(ms,
1732 ", can't read section at %jd",
1733 (intmax_t)offs) == -1)
1734 return -1;
1735 return 0;
1736 }
1737 }
1738
1739 /* Things we can determine when we seek */
1740 switch (xph_type) {
1741 case PT_DYNAMIC:
1742 dynamic = 1;
1743 offset = 0;
1744 // Let DF_1 determine if we are PIE or not.
1745 ms->mode &= ~0111;
1746 for (;;) {
1747 if (offset >= CAST(size_t, bufsize))
1748 break;
1749 offset = dodynamic(ms, nbuf, offset,
1750 CAST(size_t, bufsize), clazz, swap,
1751 &pie, &need);
1752 if (offset == 0)
1753 break;
1754 }
1755 if (ms->flags & MAGIC_MIME)
1756 continue;
1757 break;
1758
1759 case PT_INTERP:
1760 need++;
1761 if (ms->flags & MAGIC_MIME)
1762 continue;
1763 if (bufsize && nbuf[0]) {
1764 nbuf[bufsize - 1] = '\0';
1765 memcpy(interp, nbuf, CAST(size_t, bufsize));
1766 } else
1767 strlcpy(interp, "*empty*", sizeof(interp));
1768 break;
1769 case PT_NOTE:
1770 if (ms->flags & MAGIC_MIME)
1771 return 0;
1772 /*
1773 * This is a PT_NOTE section; loop through all the notes
1774 * in the section.
1775 */
1776 offset = 0;
1777 for (;;) {
1778 if (offset >= CAST(size_t, bufsize))
1779 break;
1780 offset = donote(ms, nbuf, offset,
1781 CAST(size_t, bufsize), clazz, swap, align,
1782 flags, notecount, fd, 0, 0, 0);
1783 if (offset == 0)
1784 break;
1785 }
1786 break;
1787 default:
1788 if (ms->flags & MAGIC_MIME)
1789 continue;
1790 break;
1791 }
1792 }
1793 if (ms->flags & MAGIC_MIME)
1794 return 0;
1795 if (dynamic) {
1796 if (pie && need == 0)
1797 linking_style = "static-pie";
1798 else
1799 linking_style = "dynamically";
1800 } else {
1801 linking_style = "statically";
1802 }
1803 if (file_printf(ms, ", %s linked", linking_style) == -1)
1804 return -1;
1805 if (interp[0])
1806 if (file_printf(ms, ", interpreter %s", file_printable(ms,
1807 ibuf, sizeof(ibuf), interp, sizeof(interp))) == -1)
1808 return -1;
1809 return 0;
1810 }
1811
1812
1813 file_protected int
file_tryelf(struct magic_set * ms,const struct buffer * b)1814 file_tryelf(struct magic_set *ms, const struct buffer *b)
1815 {
1816 int fd = b->fd;
1817 const unsigned char *buf = CAST(const unsigned char *, b->fbuf);
1818 size_t nbytes = b->flen;
1819 union {
1820 int32_t l;
1821 char c[sizeof(int32_t)];
1822 } u;
1823 int clazz;
1824 int swap;
1825 struct stat st;
1826 const struct stat *stp;
1827 off_t fsize;
1828 int flags = 0;
1829 Elf32_Ehdr elf32hdr;
1830 Elf64_Ehdr elf64hdr;
1831 uint16_t type, phnum, shnum, notecount;
1832
1833 if (ms->flags & (MAGIC_APPLE|MAGIC_EXTENSION))
1834 return 0;
1835 /*
1836 * ELF executables have multiple section headers in arbitrary
1837 * file locations and thus file(1) cannot determine it from easily.
1838 * Instead we traverse thru all section headers until a symbol table
1839 * one is found or else the binary is stripped.
1840 * Return immediately if it's not ELF (so we avoid pipe2file unless
1841 * needed).
1842 */
1843 if (buf[EI_MAG0] != ELFMAG0
1844 || (buf[EI_MAG1] != ELFMAG1 && buf[EI_MAG1] != OLFMAG1)
1845 || buf[EI_MAG2] != ELFMAG2 || buf[EI_MAG3] != ELFMAG3)
1846 return 0;
1847
1848 /*
1849 * If we cannot seek, it must be a pipe, socket or fifo.
1850 */
1851 if((lseek(fd, CAST(off_t, 0), SEEK_SET) == CAST(off_t, -1))
1852 && (errno == ESPIPE))
1853 fd = file_pipe2file(ms, fd, buf, nbytes);
1854
1855 if (fd == -1) {
1856 file_badread(ms);
1857 return -1;
1858 }
1859
1860 stp = &b->st;
1861 /*
1862 * b->st.st_size != 0 if previous fstat() succeeded,
1863 * which is likely, we can avoid extra stat() call.
1864 */
1865 if (b->st.st_size == 0) {
1866 stp = &st;
1867 if (fstat(fd, &st) == -1) {
1868 file_badread(ms);
1869 return -1;
1870 }
1871 }
1872 if (S_ISREG(stp->st_mode) || stp->st_size != 0)
1873 fsize = stp->st_size;
1874 else
1875 fsize = SIZE_UNKNOWN;
1876
1877 clazz = buf[EI_CLASS];
1878
1879 switch (clazz) {
1880 case ELFCLASS32:
1881 #undef elf_getu
1882 #define elf_getu(a, b) elf_getu32(a, b)
1883 #undef elfhdr
1884 #define elfhdr elf32hdr
1885 #include "elfclass.h"
1886 case ELFCLASS64:
1887 #undef elf_getu
1888 #define elf_getu(a, b) elf_getu64(a, b)
1889 #undef elfhdr
1890 #define elfhdr elf64hdr
1891 #include "elfclass.h"
1892 default:
1893 if (file_printf(ms, ", unknown class %d", clazz) == -1)
1894 return -1;
1895 break;
1896 }
1897 return 0;
1898 }
1899 #endif
1900