2 * Copyright (c) Christos Zoulas 2003.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
30 FILE_RCSID("@(#)$File: readelf.c,v 1.138 2017/08/27 07:55:02 christos Exp $")
45 private int dophn_core(struct magic_set *, int, int, int, off_t, int, size_t,
46 off_t, int *, uint16_t *);
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);
55 #define ELF_ALIGN(a) ((((a) + align - 1) / align) * align)
57 #define isquote(c) (strchr("'\"`", (c)) != NULL)
59 private uint16_t getu16(int, uint16_t);
60 private uint32_t getu32(int, uint32_t);
61 private uint64_t getu64(int, uint64_t);
64 #define MAX_SHNUM 32768
65 #define SIZE_UNKNOWN ((off_t)-1)
68 toomany(struct magic_set *ms, const char *name, uint16_t num)
70 if (file_printf(ms, ", too many %s (%u)", name, num
77 getu16(int swap, uint16_t value)
87 retval.c[0] = tmpval.c[1];
88 retval.c[1] = tmpval.c[0];
96 getu32(int swap, uint32_t value)
106 retval.c[0] = tmpval.c[3];
107 retval.c[1] = tmpval.c[2];
108 retval.c[2] = tmpval.c[1];
109 retval.c[3] = tmpval.c[0];
117 getu64(int swap, uint64_t value)
127 retval.c[0] = tmpval.c[7];
128 retval.c[1] = tmpval.c[6];
129 retval.c[2] = tmpval.c[5];
130 retval.c[3] = tmpval.c[4];
131 retval.c[4] = tmpval.c[3];
132 retval.c[5] = tmpval.c[2];
133 retval.c[6] = tmpval.c[1];
134 retval.c[7] = tmpval.c[0];
141 #define elf_getu16(swap, value) getu16(swap, value)
142 #define elf_getu32(swap, value) getu32(swap, value)
143 #define elf_getu64(swap, value) getu64(swap, value)
145 #define xsh_addr (clazz == ELFCLASS32 \
148 #define xsh_sizeof (clazz == ELFCLASS32 \
151 #define xsh_size (size_t)(clazz == ELFCLASS32 \
152 ? elf_getu32(swap, sh32.sh_size) \
153 : elf_getu64(swap, sh64.sh_size))
154 #define xsh_offset (off_t)(clazz == ELFCLASS32 \
155 ? elf_getu32(swap, sh32.sh_offset) \
156 : elf_getu64(swap, sh64.sh_offset))
157 #define xsh_type (clazz == ELFCLASS32 \
158 ? elf_getu32(swap, sh32.sh_type) \
159 : elf_getu32(swap, sh64.sh_type))
160 #define xsh_name (clazz == ELFCLASS32 \
161 ? elf_getu32(swap, sh32.sh_name) \
162 : elf_getu32(swap, sh64.sh_name))
163 #define xph_addr (clazz == ELFCLASS32 \
166 #define xph_sizeof (clazz == ELFCLASS32 \
169 #define xph_type (clazz == ELFCLASS32 \
170 ? elf_getu32(swap, ph32.p_type) \
171 : elf_getu32(swap, ph64.p_type))
172 #define xph_offset (off_t)(clazz == ELFCLASS32 \
173 ? elf_getu32(swap, ph32.p_offset) \
174 : elf_getu64(swap, ph64.p_offset))
175 #define xph_align (size_t)((clazz == ELFCLASS32 \
176 ? (off_t) (ph32.p_align ? \
177 elf_getu32(swap, ph32.p_align) : 4) \
178 : (off_t) (ph64.p_align ? \
179 elf_getu64(swap, ph64.p_align) : 4)))
180 #define xph_vaddr (size_t)((clazz == ELFCLASS32 \
181 ? (off_t) (ph32.p_vaddr ? \
182 elf_getu32(swap, ph32.p_vaddr) : 4) \
183 : (off_t) (ph64.p_vaddr ? \
184 elf_getu64(swap, ph64.p_vaddr) : 4)))
185 #define xph_filesz (size_t)((clazz == ELFCLASS32 \
186 ? elf_getu32(swap, ph32.p_filesz) \
187 : elf_getu64(swap, ph64.p_filesz)))
188 #define xnh_addr (clazz == ELFCLASS32 \
191 #define xph_memsz (size_t)((clazz == ELFCLASS32 \
192 ? elf_getu32(swap, ph32.p_memsz) \
193 : elf_getu64(swap, ph64.p_memsz)))
194 #define xnh_sizeof (clazz == ELFCLASS32 \
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 #define prpsoffsets(i) (clazz == ELFCLASS32 \
209 #define xcap_addr (clazz == ELFCLASS32 \
212 #define xcap_sizeof (clazz == ELFCLASS32 \
215 #define xcap_tag (clazz == ELFCLASS32 \
216 ? elf_getu32(swap, cap32.c_tag) \
217 : elf_getu64(swap, cap64.c_tag))
218 #define xcap_val (clazz == ELFCLASS32 \
219 ? elf_getu32(swap, cap32.c_un.c_val) \
220 : elf_getu64(swap, cap64.c_un.c_val))
221 #define xauxv_addr (clazz == ELFCLASS32 \
224 #define xauxv_sizeof (clazz == ELFCLASS32 \
227 #define xauxv_type (clazz == ELFCLASS32 \
228 ? elf_getu32(swap, auxv32.a_type) \
229 : elf_getu64(swap, auxv64.a_type))
230 #define xauxv_val (clazz == ELFCLASS32 \
231 ? elf_getu32(swap, auxv32.a_v) \
232 : elf_getu64(swap, auxv64.a_v))
236 * Try larger offsets first to avoid false matches
237 * from earlier data that happen to look like strings.
239 static const size_t prpsoffsets32[] = {
241 104, /* SunOS 5.x (command line) */
242 88, /* SunOS 5.x (short name) */
243 #endif /* USE_NT_PSINFO */
245 100, /* SunOS 5.x (command line) */
246 84, /* SunOS 5.x (short name) */
248 44, /* Linux (command line) */
249 28, /* Linux 2.0.36 (short name) */
254 static const size_t prpsoffsets64[] = {
256 152, /* SunOS 5.x (command line) */
257 136, /* SunOS 5.x (short name) */
258 #endif /* USE_NT_PSINFO */
260 136, /* SunOS 5.x, 64-bit (command line) */
261 120, /* SunOS 5.x, 64-bit (short name) */
263 56, /* Linux (command line) */
264 40, /* Linux (tested on core from 2.4.x, short name) */
266 16, /* FreeBSD, 64-bit */
269 #define NOFFSETS32 (sizeof prpsoffsets32 / sizeof prpsoffsets32[0])
270 #define NOFFSETS64 (sizeof prpsoffsets64 / sizeof prpsoffsets64[0])
272 #define NOFFSETS (clazz == ELFCLASS32 ? NOFFSETS32 : NOFFSETS64)
275 * Look through the program headers of an executable image, searching
276 * for a PT_NOTE section of type NT_PRPSINFO, with a name "CORE" or
277 * "FreeBSD"; if one is found, try looking in various places in its
278 * contents for a 16-character string containing only printable
279 * characters - if found, that string should be the name of the program
280 * that dropped core. Note: right after that 16-character string is,
281 * at least in SunOS 5.x (and possibly other SVR4-flavored systems) and
282 * Linux, a longer string (80 characters, in 5.x, probably other
283 * SVR4-flavored systems, and Linux) containing the start of the
284 * command line for that program.
286 * SunOS 5.x core files contain two PT_NOTE sections, with the types
287 * NT_PRPSINFO (old) and NT_PSINFO (new). These structs contain the
288 * same info about the command name and command line, so it probably
289 * isn't worthwhile to look for NT_PSINFO, but the offsets are provided
290 * above (see USE_NT_PSINFO), in case we ever decide to do so. The
291 * NT_PRPSINFO and NT_PSINFO sections are always in order and adjacent;
292 * the SunOS 5.x file command relies on this (and prefers the latter).
294 * The signal number probably appears in a section of type NT_PRSTATUS,
295 * but that's also rather OS-dependent, in ways that are harder to
296 * dissect with heuristics, so I'm not bothering with the signal number.
297 * (I suppose the signal number could be of interest in situations where
298 * you don't have the binary of the program that dropped core; if you
299 * *do* have that binary, the debugger will probably tell you what
303 #define OS_STYLE_SVR4 0
304 #define OS_STYLE_FREEBSD 1
305 #define OS_STYLE_NETBSD 2
307 private const char os_style_names[][8] = {
313 #define FLAGS_CORE_STYLE 0x003
315 #define FLAGS_DID_CORE 0x004
316 #define FLAGS_DID_OS_NOTE 0x008
317 #define FLAGS_DID_BUILD_ID 0x010
318 #define FLAGS_DID_CORE_STYLE 0x020
319 #define FLAGS_DID_NETBSD_PAX 0x040
320 #define FLAGS_DID_NETBSD_MARCH 0x080
321 #define FLAGS_DID_NETBSD_CMODEL 0x100
322 #define FLAGS_DID_NETBSD_UNKNOWN 0x200
323 #define FLAGS_IS_CORE 0x400
324 #define FLAGS_DID_AUXV 0x800
327 dophn_core(struct magic_set *ms, int clazz, int swap, int fd, off_t off,
328 int num, size_t size, off_t fsize, int *flags, uint16_t *notecount)
333 unsigned char nbuf[BUFSIZ];
338 if (size != xph_sizeof) {
339 if (file_printf(ms, ", corrupted program header size") == -1)
345 * Loop through all the program headers.
347 for ( ; num; num--) {
348 if (pread(fd, xph_addr, xph_sizeof, off) < (ssize_t)xph_sizeof) {
354 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) {
355 /* Perhaps warn here */
359 if (xph_type != PT_NOTE)
363 * This is a PT_NOTE section; loop through all the notes
366 len = xph_filesz < sizeof(nbuf) ? xph_filesz : sizeof(nbuf);
367 if ((bufsize = pread(fd, nbuf, len, xph_offset)) == -1) {
373 if (offset >= (size_t)bufsize)
375 offset = donote(ms, nbuf, offset, (size_t)bufsize,
376 clazz, swap, 4, flags, notecount, fd, ph_off,
388 do_note_netbsd_version(struct magic_set *ms, int swap, void *v)
391 (void)memcpy(&desc, v, sizeof(desc));
392 desc = elf_getu32(swap, desc);
394 if (file_printf(ms, ", for NetBSD") == -1)
397 * The version number used to be stuck as 199905, and was thus
398 * basically content-free. Newer versions of NetBSD have fixed
399 * this and now use the encoding of __NetBSD_Version__:
405 * r = release ["",A-Z,Z[A-Z] but numeric]
408 if (desc > 100000000U) {
409 uint32_t ver_patch = (desc / 100) % 100;
410 uint32_t ver_rel = (desc / 10000) % 100;
411 uint32_t ver_min = (desc / 1000000) % 100;
412 uint32_t ver_maj = desc / 100000000;
414 if (file_printf(ms, " %u.%u", ver_maj, ver_min) == -1)
416 if (ver_rel == 0 && ver_patch != 0) {
417 if (file_printf(ms, ".%u", ver_patch) == -1)
419 } else if (ver_rel != 0) {
420 while (ver_rel > 26) {
421 if (file_printf(ms, "Z") == -1)
425 if (file_printf(ms, "%c", 'A' + ver_rel - 1)
433 do_note_freebsd_version(struct magic_set *ms, int swap, void *v)
437 (void)memcpy(&desc, v, sizeof(desc));
438 desc = elf_getu32(swap, desc);
439 if (file_printf(ms, ", for FreeBSD") == -1)
443 * Contents is __FreeBSD_version, whose relation to OS
444 * versions is defined by a huge table in the Porter's
445 * Handbook. This is the general scheme:
448 * Mmp000 (before 4.10)
449 * Mmi0p0 (before 5.0)
452 * Development branches:
453 * Mmpxxx (before 4.6)
454 * Mmp1xx (before 4.10)
455 * Mmi1xx (before 5.0)
461 * i = minor version increment (491000 -> 4.10)
465 * The first release of FreeBSD to use ELF by default
468 if (desc == 460002) {
469 if (file_printf(ms, " 4.6.2") == -1)
471 } else if (desc < 460100) {
472 if (file_printf(ms, " %d.%d", desc / 100000,
473 desc / 10000 % 10) == -1)
475 if (desc / 1000 % 10 > 0)
476 if (file_printf(ms, ".%d", desc / 1000 % 10) == -1)
478 if ((desc % 1000 > 0) || (desc % 100000 == 0))
479 if (file_printf(ms, " (%d)", desc) == -1)
481 } else if (desc < 500000) {
482 if (file_printf(ms, " %d.%d", desc / 100000,
483 desc / 10000 % 10 + desc / 1000 % 10) == -1)
485 if (desc / 100 % 10 > 0) {
486 if (file_printf(ms, " (%d)", desc) == -1)
488 } else if (desc / 10 % 10 > 0) {
489 if (file_printf(ms, ".%d", desc / 10 % 10) == -1)
493 if (file_printf(ms, " %d.%d", desc / 100000,
494 desc / 1000 % 100) == -1)
496 if ((desc / 100 % 10 > 0) ||
497 (desc % 100000 / 100 == 0)) {
498 if (file_printf(ms, " (%d)", desc) == -1)
500 } else if (desc / 10 % 10 > 0) {
501 if (file_printf(ms, ".%d", desc / 10 % 10) == -1)
509 do_bid_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type,
510 int swap __attribute__((__unused__)), uint32_t namesz, uint32_t descsz,
511 size_t noff, size_t doff, int *flags)
513 if (namesz == 4 && strcmp((char *)&nbuf[noff], "GNU") == 0 &&
514 type == NT_GNU_BUILD_ID && (descsz >= 4 && descsz <= 20)) {
518 *flags |= FLAGS_DID_BUILD_ID;
533 if (file_printf(ms, ", BuildID[%s]=", btype) == -1)
535 (void)memcpy(desc, &nbuf[doff], descsz);
536 for (i = 0; i < descsz; i++)
537 if (file_printf(ms, "%02x", desc[i]) == -1)
545 do_os_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type,
546 int swap, uint32_t namesz, uint32_t descsz,
547 size_t noff, size_t doff, int *flags)
549 if (namesz == 5 && strcmp((char *)&nbuf[noff], "SuSE") == 0 &&
550 type == NT_GNU_VERSION && descsz == 2) {
551 *flags |= FLAGS_DID_OS_NOTE;
552 file_printf(ms, ", for SuSE %d.%d", nbuf[doff], nbuf[doff + 1]);
556 if (namesz == 4 && strcmp((char *)&nbuf[noff], "GNU") == 0 &&
557 type == NT_GNU_VERSION && descsz == 16) {
559 (void)memcpy(desc, &nbuf[doff], sizeof(desc));
561 *flags |= FLAGS_DID_OS_NOTE;
562 if (file_printf(ms, ", for GNU/") == -1)
564 switch (elf_getu32(swap, desc[0])) {
566 if (file_printf(ms, "Linux") == -1)
570 if (file_printf(ms, "Hurd") == -1)
574 if (file_printf(ms, "Solaris") == -1)
577 case GNU_OS_KFREEBSD:
578 if (file_printf(ms, "kFreeBSD") == -1)
582 if (file_printf(ms, "kNetBSD") == -1)
586 if (file_printf(ms, "<unknown>") == -1)
589 if (file_printf(ms, " %d.%d.%d", elf_getu32(swap, desc[1]),
590 elf_getu32(swap, desc[2]), elf_getu32(swap, desc[3])) == -1)
595 if (namesz == 7 && strcmp((char *)&nbuf[noff], "NetBSD") == 0) {
596 if (type == NT_NETBSD_VERSION && descsz == 4) {
597 *flags |= FLAGS_DID_OS_NOTE;
598 do_note_netbsd_version(ms, swap, &nbuf[doff]);
603 if (namesz == 8 && strcmp((char *)&nbuf[noff], "FreeBSD") == 0) {
604 if (type == NT_FREEBSD_VERSION && descsz == 4) {
605 *flags |= FLAGS_DID_OS_NOTE;
606 do_note_freebsd_version(ms, swap, &nbuf[doff]);
611 if (namesz == 8 && strcmp((char *)&nbuf[noff], "OpenBSD") == 0 &&
612 type == NT_OPENBSD_VERSION && descsz == 4) {
613 *flags |= FLAGS_DID_OS_NOTE;
614 if (file_printf(ms, ", for OpenBSD") == -1)
616 /* Content of note is always 0 */
620 if (namesz == 10 && strcmp((char *)&nbuf[noff], "DragonFly") == 0 &&
621 type == NT_DRAGONFLY_VERSION && descsz == 4) {
623 *flags |= FLAGS_DID_OS_NOTE;
624 if (file_printf(ms, ", for DragonFly") == -1)
626 (void)memcpy(&desc, &nbuf[doff], sizeof(desc));
627 desc = elf_getu32(swap, desc);
628 if (file_printf(ms, " %d.%d.%d", desc / 100000,
629 desc / 10000 % 10, desc % 10000) == -1)
637 do_pax_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type,
638 int swap, uint32_t namesz, uint32_t descsz,
639 size_t noff, size_t doff, int *flags)
641 if (namesz == 4 && strcmp((char *)&nbuf[noff], "PaX") == 0 &&
642 type == NT_NETBSD_PAX && descsz == 4) {
643 static const char *pax[] = {
655 *flags |= FLAGS_DID_NETBSD_PAX;
656 (void)memcpy(&desc, &nbuf[doff], sizeof(desc));
657 desc = elf_getu32(swap, desc);
659 if (desc && file_printf(ms, ", PaX: ") == -1)
662 for (i = 0; i < __arraycount(pax); i++) {
663 if (((1 << (int)i) & desc) == 0)
665 if (file_printf(ms, "%s%s", did++ ? "," : "",
675 do_core_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type,
676 int swap, uint32_t namesz, uint32_t descsz,
677 size_t noff, size_t doff, int *flags, size_t size, int clazz)
682 * Sigh. The 2.0.36 kernel in Debian 2.1, at
683 * least, doesn't correctly implement name
684 * sections, in core dumps, as specified by
685 * the "Program Linking" section of "UNIX(R) System
686 * V Release 4 Programmer's Guide: ANSI C and
687 * Programming Support Tools", because my copy
688 * clearly says "The first 'namesz' bytes in 'name'
689 * contain a *null-terminated* [emphasis mine]
690 * character representation of the entry's owner
691 * or originator", but the 2.0.36 kernel code
692 * doesn't include the terminating null in the
695 if ((namesz == 4 && strncmp((char *)&nbuf[noff], "CORE", 4) == 0) ||
696 (namesz == 5 && strcmp((char *)&nbuf[noff], "CORE") == 0)) {
697 os_style = OS_STYLE_SVR4;
700 if ((namesz == 8 && strcmp((char *)&nbuf[noff], "FreeBSD") == 0)) {
701 os_style = OS_STYLE_FREEBSD;
704 if ((namesz >= 11 && strncmp((char *)&nbuf[noff], "NetBSD-CORE", 11)
706 os_style = OS_STYLE_NETBSD;
709 if (os_style != -1 && (*flags & FLAGS_DID_CORE_STYLE) == 0) {
710 if (file_printf(ms, ", %s-style", os_style_names[os_style])
713 *flags |= FLAGS_DID_CORE_STYLE;
718 case OS_STYLE_NETBSD:
719 if (type == NT_NETBSD_CORE_PROCINFO) {
721 struct NetBSD_elfcore_procinfo pi;
722 memset(&pi, 0, sizeof(pi));
723 memcpy(&pi, nbuf + doff, descsz);
725 if (file_printf(ms, ", from '%.31s', pid=%u, uid=%u, "
726 "gid=%u, nlwps=%u, lwp=%u (signal %u/code %u)",
727 file_printable(sbuf, sizeof(sbuf),
728 CAST(char *, pi.cpi_name)),
729 elf_getu32(swap, pi.cpi_pid),
730 elf_getu32(swap, pi.cpi_euid),
731 elf_getu32(swap, pi.cpi_egid),
732 elf_getu32(swap, pi.cpi_nlwps),
733 elf_getu32(swap, pi.cpi_siglwp),
734 elf_getu32(swap, pi.cpi_signo),
735 elf_getu32(swap, pi.cpi_sigcode)) == -1)
738 *flags |= FLAGS_DID_CORE;
744 if (type == NT_PRPSINFO && *flags & FLAGS_IS_CORE) {
748 * Extract the program name. We assume
749 * it to be 16 characters (that's what it
750 * is in SunOS 5.x and Linux).
752 * Unfortunately, it's at a different offset
753 * in various OSes, so try multiple offsets.
754 * If the characters aren't all printable,
757 for (i = 0; i < NOFFSETS; i++) {
758 unsigned char *cname, *cp;
759 size_t reloffset = prpsoffsets(i);
760 size_t noffset = doff + reloffset;
762 for (j = 0; j < 16; j++, noffset++,
765 * Make sure we're not past
766 * the end of the buffer; if
767 * we are, just give up.
773 * Make sure we're not past
774 * the end of the contents;
775 * if we are, this obviously
776 * isn't the right offset.
778 if (reloffset >= descsz)
800 if (!isprint(c) || isquote(c))
809 * Try next offsets, in case this match is
810 * in the middle of a string.
812 for (k = i + 1 ; k < NOFFSETS; k++) {
815 if (prpsoffsets(k) >= prpsoffsets(i))
817 for (no = doff + prpsoffsets(k);
818 no < doff + prpsoffsets(i); no++)
820 && isprint(nbuf[no]);
825 cname = (unsigned char *)
826 &nbuf[doff + prpsoffsets(i)];
827 for (cp = cname; *cp && isprint(*cp); cp++)
830 * Linux apparently appends a space at the end
831 * of the command line: remove it.
833 while (cp > cname && isspace(cp[-1]))
835 if (file_printf(ms, ", from '%.*s'",
836 (int)(cp - cname), cname) == -1)
838 *flags |= FLAGS_DID_CORE;
852 get_offset_from_virtaddr(struct magic_set *ms, int swap, int clazz, int fd,
853 off_t off, int num, off_t fsize, uint64_t virtaddr)
859 * Loop through all the program headers and find the header with
860 * virtual address in which the "virtaddr" belongs to.
862 for ( ; num; num--) {
863 if (pread(fd, xph_addr, xph_sizeof, off) < (ssize_t)xph_sizeof) {
869 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) {
870 /* Perhaps warn here */
874 if (virtaddr >= xph_vaddr && virtaddr < xph_vaddr + xph_filesz)
875 return xph_offset + (virtaddr - xph_vaddr);
881 get_string_on_virtaddr(struct magic_set *ms,
882 int swap, int clazz, int fd, off_t ph_off, int ph_num,
883 off_t fsize, uint64_t virtaddr, char *buf, ssize_t buflen)
891 offset = get_offset_from_virtaddr(ms, swap, clazz, fd, ph_off, ph_num,
893 if ((buflen = pread(fd, buf, CAST(size_t, buflen), offset)) <= 0) {
898 buf[buflen - 1] = '\0';
900 /* We expect only printable characters, so return if buffer contains
901 * non-printable character before the '\0' or just '\0'. */
902 for (bptr = buf; *bptr && isprint((unsigned char)*bptr); bptr++)
912 do_auxv_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type,
913 int swap, uint32_t namesz __attribute__((__unused__)),
914 uint32_t descsz __attribute__((__unused__)),
915 size_t noff __attribute__((__unused__)), size_t doff,
916 int *flags, size_t size __attribute__((__unused__)), int clazz,
917 int fd, off_t ph_off, int ph_num, off_t fsize)
922 size_t elsize = xauxv_sizeof;
927 if ((*flags & (FLAGS_IS_CORE|FLAGS_DID_CORE_STYLE)) !=
928 (FLAGS_IS_CORE|FLAGS_DID_CORE_STYLE))
931 switch (*flags & FLAGS_CORE_STYLE) {
937 case OS_STYLE_NETBSD:
938 if (type != NT_NETBSD_CORE_AUXV)
941 case OS_STYLE_FREEBSD:
942 if (type != NT_FREEBSD_PROCSTAT_AUXV)
950 *flags |= FLAGS_DID_AUXV;
953 for (size_t off = 0; off + elsize <= descsz; off += elsize) {
954 (void)memcpy(xauxv_addr, &nbuf[doff + off], xauxv_sizeof);
955 /* Limit processing to 50 vector entries to prevent DoS */
957 file_error(ms, 0, "Too many ELF Auxv elements");
962 case AT_LINUX_EXECFN:
966 case AT_LINUX_PLATFORM:
980 tag = "effective uid";
984 tag = "effective gid";
998 buflen = get_string_on_virtaddr(ms, swap, clazz, fd,
999 ph_off, ph_num, fsize, xauxv_val, buf, sizeof(buf));
1004 if (file_printf(ms, ", %s: '%s'", tag, buf) == -1)
1007 if (file_printf(ms, ", %s: %d", tag, (int) xauxv_val)
1019 donote(struct magic_set *ms, void *vbuf, size_t offset, size_t size,
1020 int clazz, int swap, size_t align, int *flags, uint16_t *notecount,
1021 int fd, off_t ph_off, int ph_num, off_t fsize)
1026 uint32_t namesz, descsz;
1027 unsigned char *nbuf = CAST(unsigned char *, vbuf);
1029 if (*notecount == 0)
1033 if (xnh_sizeof + offset > size) {
1035 * We're out of note headers.
1037 return xnh_sizeof + offset;
1040 (void)memcpy(xnh_addr, &nbuf[offset], xnh_sizeof);
1041 offset += xnh_sizeof;
1043 namesz = xnh_namesz;
1044 descsz = xnh_descsz;
1046 if ((namesz == 0) && (descsz == 0)) {
1048 * We're out of note headers.
1050 return (offset >= size) ? offset : size;
1053 if (namesz & 0x80000000) {
1054 (void)file_printf(ms, ", bad note name size %#lx",
1055 (unsigned long)namesz);
1059 if (descsz & 0x80000000) {
1060 (void)file_printf(ms, ", bad note description size %#lx",
1061 (unsigned long)descsz);
1066 doff = ELF_ALIGN(offset + namesz);
1068 if (offset + namesz > size) {
1070 * We're past the end of the buffer.
1075 offset = ELF_ALIGN(doff + descsz);
1076 if (doff + descsz > size) {
1078 * We're past the end of the buffer.
1080 return (offset >= size) ? offset : size;
1084 if ((*flags & FLAGS_DID_OS_NOTE) == 0) {
1085 if (do_os_note(ms, nbuf, xnh_type, swap,
1086 namesz, descsz, noff, doff, flags))
1090 if ((*flags & FLAGS_DID_BUILD_ID) == 0) {
1091 if (do_bid_note(ms, nbuf, xnh_type, swap,
1092 namesz, descsz, noff, doff, flags))
1096 if ((*flags & FLAGS_DID_NETBSD_PAX) == 0) {
1097 if (do_pax_note(ms, nbuf, xnh_type, swap,
1098 namesz, descsz, noff, doff, flags))
1102 if ((*flags & FLAGS_DID_CORE) == 0) {
1103 if (do_core_note(ms, nbuf, xnh_type, swap,
1104 namesz, descsz, noff, doff, flags, size, clazz))
1108 if ((*flags & FLAGS_DID_AUXV) == 0) {
1109 if (do_auxv_note(ms, nbuf, xnh_type, swap,
1110 namesz, descsz, noff, doff, flags, size, clazz,
1111 fd, ph_off, ph_num, fsize))
1115 if (namesz == 7 && strcmp((char *)&nbuf[noff], "NetBSD") == 0) {
1119 case NT_NETBSD_VERSION:
1121 case NT_NETBSD_MARCH:
1122 if (*flags & FLAGS_DID_NETBSD_MARCH)
1124 *flags |= FLAGS_DID_NETBSD_MARCH;
1125 if (file_printf(ms, ", compiled for: %.*s",
1126 (int)descsz, (const char *)&nbuf[doff]) == -1)
1129 case NT_NETBSD_CMODEL:
1130 if (*flags & FLAGS_DID_NETBSD_CMODEL)
1132 *flags |= FLAGS_DID_NETBSD_CMODEL;
1133 if (file_printf(ms, ", compiler model: %.*s",
1134 (int)descsz, (const char *)&nbuf[doff]) == -1)
1138 if (*flags & FLAGS_DID_NETBSD_UNKNOWN)
1140 *flags |= FLAGS_DID_NETBSD_UNKNOWN;
1141 if (file_printf(ms, ", note=%u", xnh_type) == -1)
1151 /* SunOS 5.x hardware capability descriptions */
1152 typedef struct cap_desc {
1154 const char *cd_name;
1157 static const cap_desc_t cap_desc_sparc[] = {
1158 { AV_SPARC_MUL32, "MUL32" },
1159 { AV_SPARC_DIV32, "DIV32" },
1160 { AV_SPARC_FSMULD, "FSMULD" },
1161 { AV_SPARC_V8PLUS, "V8PLUS" },
1162 { AV_SPARC_POPC, "POPC" },
1163 { AV_SPARC_VIS, "VIS" },
1164 { AV_SPARC_VIS2, "VIS2" },
1165 { AV_SPARC_ASI_BLK_INIT, "ASI_BLK_INIT" },
1166 { AV_SPARC_FMAF, "FMAF" },
1167 { AV_SPARC_FJFMAU, "FJFMAU" },
1168 { AV_SPARC_IMA, "IMA" },
1172 static const cap_desc_t cap_desc_386[] = {
1173 { AV_386_FPU, "FPU" },
1174 { AV_386_TSC, "TSC" },
1175 { AV_386_CX8, "CX8" },
1176 { AV_386_SEP, "SEP" },
1177 { AV_386_AMD_SYSC, "AMD_SYSC" },
1178 { AV_386_CMOV, "CMOV" },
1179 { AV_386_MMX, "MMX" },
1180 { AV_386_AMD_MMX, "AMD_MMX" },
1181 { AV_386_AMD_3DNow, "AMD_3DNow" },
1182 { AV_386_AMD_3DNowx, "AMD_3DNowx" },
1183 { AV_386_FXSR, "FXSR" },
1184 { AV_386_SSE, "SSE" },
1185 { AV_386_SSE2, "SSE2" },
1186 { AV_386_PAUSE, "PAUSE" },
1187 { AV_386_SSE3, "SSE3" },
1188 { AV_386_MON, "MON" },
1189 { AV_386_CX16, "CX16" },
1190 { AV_386_AHF, "AHF" },
1191 { AV_386_TSCP, "TSCP" },
1192 { AV_386_AMD_SSE4A, "AMD_SSE4A" },
1193 { AV_386_POPCNT, "POPCNT" },
1194 { AV_386_AMD_LZCNT, "AMD_LZCNT" },
1195 { AV_386_SSSE3, "SSSE3" },
1196 { AV_386_SSE4_1, "SSE4.1" },
1197 { AV_386_SSE4_2, "SSE4.2" },
1202 doshn(struct magic_set *ms, int clazz, int swap, int fd, off_t off, int num,
1203 size_t size, off_t fsize, int mach, int strtab, int *flags,
1204 uint16_t *notecount)
1208 int stripped = 1, has_debug_info = 0;
1211 off_t noff, coff, name_off;
1212 uint64_t cap_hw1 = 0; /* SunOS 5.x hardware capabilities */
1213 uint64_t cap_sf1 = 0; /* SunOS 5.x software capabilities */
1217 if (size != xsh_sizeof) {
1218 if (file_printf(ms, ", corrupted section header size") == -1)
1223 /* Read offset of name section to be able to read section names later */
1224 if (pread(fd, xsh_addr, xsh_sizeof, CAST(off_t, (off + size * strtab)))
1225 < (ssize_t)xsh_sizeof) {
1226 if (file_printf(ms, ", missing section headers") == -1)
1230 name_off = xsh_offset;
1232 for ( ; num; num--) {
1233 /* Read the name of this section. */
1234 if ((namesize = pread(fd, name, sizeof(name) - 1, name_off + xsh_name)) == -1) {
1238 name[namesize] = '\0';
1239 if (strcmp(name, ".debug_info") == 0) {
1244 if (pread(fd, xsh_addr, xsh_sizeof, off) < (ssize_t)xsh_sizeof) {
1250 /* Things we can determine before we seek */
1259 if (fsize != SIZE_UNKNOWN && xsh_offset > fsize) {
1260 /* Perhaps warn here */
1267 /* Things we can determine when we seek */
1270 if ((uintmax_t)(xsh_size + xsh_offset) >
1273 ", note offset/size %#" INTMAX_T_FORMAT
1274 "x+%#" INTMAX_T_FORMAT "x exceeds"
1275 " file size %#" INTMAX_T_FORMAT "x",
1276 (uintmax_t)xsh_offset, (uintmax_t)xsh_size,
1277 (uintmax_t)fsize) == -1)
1281 if ((nbuf = malloc(xsh_size)) == NULL) {
1282 file_error(ms, errno, "Cannot allocate memory"
1286 if (pread(fd, nbuf, xsh_size, xsh_offset) <
1287 (ssize_t)xsh_size) {
1295 if (noff >= (off_t)xsh_size)
1297 noff = donote(ms, nbuf, (size_t)noff,
1298 xsh_size, clazz, swap, 4, flags, notecount,
1319 if (lseek(fd, xsh_offset, SEEK_SET) == (off_t)-1) {
1327 char cbuf[/*CONSTCOND*/
1328 MAX(sizeof cap32, sizeof cap64)];
1329 if ((coff += xcap_sizeof) > (off_t)xsh_size)
1331 if (read(fd, cbuf, (size_t)xcap_sizeof) !=
1332 (ssize_t)xcap_sizeof) {
1336 if (cbuf[0] == 'A') {
1340 memcpy(&len, p, sizeof(len));
1342 len = getu32(swap, len);
1343 if (memcmp("gnu", p, 3) != 0) {
1345 ", unknown capability %.3s", p)
1352 memcpy(&len, p, sizeof(len));
1354 len = getu32(swap, len);
1356 if (file_printf(ms, ", unknown gnu"
1357 " capability tag %d", tag)
1366 (void)memcpy(xcap_addr, cbuf, xcap_sizeof);
1371 cap_hw1 |= xcap_val;
1374 cap_sf1 |= xcap_val;
1378 ", with unknown capability "
1379 "%#" INT64_T_FORMAT "x = %#"
1381 (unsigned long long)xcap_tag,
1382 (unsigned long long)xcap_val) == -1)
1396 if (has_debug_info) {
1397 if (file_printf(ms, ", with debug_info") == -1)
1400 if (file_printf(ms, ", %sstripped", stripped ? "" : "not ") == -1)
1403 const cap_desc_t *cdp;
1406 case EM_SPARC32PLUS:
1408 cdp = cap_desc_sparc;
1419 if (file_printf(ms, ", uses") == -1)
1422 while (cdp->cd_name) {
1423 if (cap_hw1 & cdp->cd_mask) {
1425 " %s", cdp->cd_name) == -1)
1427 cap_hw1 &= ~cdp->cd_mask;
1433 " unknown hardware capability %#"
1435 (unsigned long long)cap_hw1) == -1)
1439 " hardware capability %#" INT64_T_FORMAT "x",
1440 (unsigned long long)cap_hw1) == -1)
1445 if (cap_sf1 & SF1_SUNW_FPUSED) {
1447 (cap_sf1 & SF1_SUNW_FPKNWN)
1448 ? ", uses frame pointer"
1449 : ", not known to use frame pointer") == -1)
1452 cap_sf1 &= ~SF1_SUNW_MASK;
1455 ", with unknown software capability %#"
1457 (unsigned long long)cap_sf1) == -1)
1464 * Look through the program headers of an executable image, searching
1465 * for a PT_INTERP section; if one is found, it's dynamically linked,
1466 * otherwise it's statically linked.
1469 dophn_exec(struct magic_set *ms, int clazz, int swap, int fd, off_t off,
1470 int num, size_t size, off_t fsize, int sh_num, int *flags,
1471 uint16_t *notecount)
1475 const char *linking_style = "statically";
1476 const char *interp = "";
1477 unsigned char nbuf[BUFSIZ];
1480 size_t offset, align, len;
1482 if (size != xph_sizeof) {
1483 if (file_printf(ms, ", corrupted program header size") == -1)
1488 for ( ; num; num--) {
1489 if (pread(fd, xph_addr, xph_sizeof, off) < (ssize_t)xph_sizeof) {
1498 /* Things we can determine before we seek */
1501 linking_style = "dynamically";
1504 if (sh_num) /* Did this through section headers */
1506 if (((align = xph_align) & 0x80000000UL) != 0 ||
1509 ", invalid note alignment %#lx",
1510 (unsigned long)align) == -1)
1516 len = xph_filesz < sizeof(nbuf) ? xph_filesz
1518 bufsize = pread(fd, nbuf, len, xph_offset);
1519 if (bufsize == -1) {
1525 if (fsize != SIZE_UNKNOWN && xph_offset > fsize) {
1526 /* Maybe warn here? */
1532 /* Things we can determine when we seek */
1535 if (bufsize && nbuf[0]) {
1536 nbuf[bufsize - 1] = '\0';
1537 interp = (const char *)nbuf;
1543 * This is a PT_NOTE section; loop through all the notes
1548 if (offset >= (size_t)bufsize)
1550 offset = donote(ms, nbuf, offset,
1551 (size_t)bufsize, clazz, swap, align,
1552 flags, notecount, fd, 0, 0, 0);
1561 if (file_printf(ms, ", %s linked", linking_style)
1565 if (file_printf(ms, ", interpreter %s",
1566 file_printable(ibuf, sizeof(ibuf), interp)) == -1)
1573 file_tryelf(struct magic_set *ms, int fd, const unsigned char *buf,
1578 char c[sizeof (int32_t)];
1585 Elf32_Ehdr elf32hdr;
1586 Elf64_Ehdr elf64hdr;
1587 uint16_t type, phnum, shnum, notecount;
1589 if (ms->flags & (MAGIC_MIME|MAGIC_APPLE|MAGIC_EXTENSION))
1592 * ELF executables have multiple section headers in arbitrary
1593 * file locations and thus file(1) cannot determine it from easily.
1594 * Instead we traverse thru all section headers until a symbol table
1595 * one is found or else the binary is stripped.
1596 * Return immediately if it's not ELF (so we avoid pipe2file unless needed).
1598 if (buf[EI_MAG0] != ELFMAG0
1599 || (buf[EI_MAG1] != ELFMAG1 && buf[EI_MAG1] != OLFMAG1)
1600 || buf[EI_MAG2] != ELFMAG2 || buf[EI_MAG3] != ELFMAG3)
1604 * If we cannot seek, it must be a pipe, socket or fifo.
1606 if((lseek(fd, (off_t)0, SEEK_SET) == (off_t)-1) && (errno == ESPIPE))
1607 fd = file_pipe2file(ms, fd, buf, nbytes);
1609 if (fstat(fd, &st) == -1) {
1613 if (S_ISREG(st.st_mode) || st.st_size != 0)
1616 fsize = SIZE_UNKNOWN;
1618 clazz = buf[EI_CLASS];
1623 #define elf_getu(a, b) elf_getu32(a, b)
1625 #define elfhdr elf32hdr
1626 #include "elfclass.h"
1629 #define elf_getu(a, b) elf_getu64(a, b)
1631 #define elfhdr elf64hdr
1632 #include "elfclass.h"
1634 if (file_printf(ms, ", unknown class %d", clazz) == -1)