readelf.c revision 054ccb502d71e1ee13755081d7f4bda5fc1e8220
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
30FILE_RCSID("@(#)$File: readelf.c,v 1.128 2016/10/04 21:43:10 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
45private int dophn_core(struct magic_set *, int, int, int, off_t, int, size_t,
46    off_t, int *, uint16_t *);
47#endif
48private int dophn_exec(struct magic_set *, int, int, int, off_t, int, size_t,
49    off_t, int, int *, uint16_t *);
50private int doshn(struct magic_set *, int, int, int, off_t, int, size_t,
51    off_t, int, int, int *, uint16_t *);
52private 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
59private uint16_t getu16(int, uint16_t);
60private uint32_t getu32(int, uint32_t);
61private uint64_t getu64(int, uint64_t);
62
63#define MAX_PHNUM	128
64#define	MAX_SHNUM	32768
65#define SIZE_UNKNOWN	((off_t)-1)
66
67private int
68toomany(struct magic_set *ms, const char *name, uint16_t num)
69{
70	if (file_printf(ms, ", too many %s (%u)", name, num
71	    ) == -1)
72		return -1;
73	return 0;
74}
75
76private uint16_t
77getu16(int swap, uint16_t value)
78{
79	union {
80		uint16_t ui;
81		char c[2];
82	} retval, tmpval;
83
84	if (swap) {
85		tmpval.ui = value;
86
87		retval.c[0] = tmpval.c[1];
88		retval.c[1] = tmpval.c[0];
89
90		return retval.ui;
91	} else
92		return value;
93}
94
95private uint32_t
96getu32(int swap, uint32_t value)
97{
98	union {
99		uint32_t ui;
100		char c[4];
101	} retval, tmpval;
102
103	if (swap) {
104		tmpval.ui = value;
105
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];
110
111		return retval.ui;
112	} else
113		return value;
114}
115
116private uint64_t
117getu64(int swap, uint64_t value)
118{
119	union {
120		uint64_t ui;
121		char c[8];
122	} retval, tmpval;
123
124	if (swap) {
125		tmpval.ui = value;
126
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];
135
136		return retval.ui;
137	} else
138		return value;
139}
140
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)
144
145#define xsh_addr	(clazz == ELFCLASS32			\
146			 ? (void *)&sh32			\
147			 : (void *)&sh64)
148#define xsh_sizeof	(clazz == ELFCLASS32			\
149			 ? sizeof(sh32)				\
150			 : sizeof(sh64))
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			\
164			 ? (void *) &ph32			\
165			 : (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	(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			\
189			 ? (void *)&nh32			\
190			 : (void *)&nh64)
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			\
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#define prpsoffsets(i)	(clazz == ELFCLASS32			\
207			 ? prpsoffsets32[i]			\
208			 : prpsoffsets64[i])
209#define xcap_addr	(clazz == ELFCLASS32			\
210			 ? (void *)&cap32			\
211			 : (void *)&cap64)
212#define xcap_sizeof	(clazz == ELFCLASS32			\
213			 ? sizeof cap32				\
214			 : sizeof cap64)
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			\
222			 ? (void *)&auxv32			\
223			 : (void *)&auxv64)
224#define xauxv_sizeof	(clazz == ELFCLASS32			\
225			 ? sizeof(auxv32)			\
226			 : sizeof(auxv64))
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))
233
234#ifdef ELFCORE
235/*
236 * Try larger offsets first to avoid false matches
237 * from earlier data that happen to look like strings.
238 */
239static const size_t	prpsoffsets32[] = {
240#ifdef USE_NT_PSINFO
241	104,		/* SunOS 5.x (command line) */
242	88,		/* SunOS 5.x (short name) */
243#endif /* USE_NT_PSINFO */
244
245	100,		/* SunOS 5.x (command line) */
246	84,		/* SunOS 5.x (short name) */
247
248	44,		/* Linux (command line) */
249	28,		/* Linux 2.0.36 (short name) */
250
251	8,		/* FreeBSD */
252};
253
254static const size_t	prpsoffsets64[] = {
255#ifdef USE_NT_PSINFO
256	152,		/* SunOS 5.x (command line) */
257	136,		/* SunOS 5.x (short name) */
258#endif /* USE_NT_PSINFO */
259
260	136,		/* SunOS 5.x, 64-bit (command line) */
261	120,		/* SunOS 5.x, 64-bit (short name) */
262
263	56,		/* Linux (command line) */
264	40,             /* Linux (tested on core from 2.4.x, short name) */
265
266	16,		/* FreeBSD, 64-bit */
267};
268
269#define	NOFFSETS32	(sizeof prpsoffsets32 / sizeof prpsoffsets32[0])
270#define NOFFSETS64	(sizeof prpsoffsets64 / sizeof prpsoffsets64[0])
271
272#define NOFFSETS	(clazz == ELFCLASS32 ? NOFFSETS32 : NOFFSETS64)
273
274/*
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.
285 *
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).
293 *
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
300 * signal it was.)
301 */
302
303#define	OS_STYLE_SVR4		0
304#define	OS_STYLE_FREEBSD	1
305#define	OS_STYLE_NETBSD		2
306
307private const char os_style_names[][8] = {
308	"SVR4",
309	"FreeBSD",
310	"NetBSD",
311};
312
313#define FLAGS_DID_CORE			0x001
314#define FLAGS_DID_OS_NOTE		0x002
315#define FLAGS_DID_BUILD_ID		0x004
316#define FLAGS_DID_CORE_STYLE		0x008
317#define FLAGS_DID_NETBSD_PAX		0x010
318#define FLAGS_DID_NETBSD_MARCH		0x020
319#define FLAGS_DID_NETBSD_CMODEL		0x040
320#define FLAGS_DID_NETBSD_UNKNOWN	0x080
321#define FLAGS_IS_CORE			0x100
322#define FLAGS_DID_AUXV			0x200
323
324private int
325dophn_core(struct magic_set *ms, int clazz, int swap, int fd, off_t off,
326    int num, size_t size, off_t fsize, int *flags, uint16_t *notecount)
327{
328	Elf32_Phdr ph32;
329	Elf64_Phdr ph64;
330	size_t offset, len;
331	unsigned char nbuf[BUFSIZ];
332	ssize_t bufsize;
333	off_t ph_off = off;
334	int ph_num = num;
335
336	if (size != xph_sizeof) {
337		if (file_printf(ms, ", corrupted program header size") == -1)
338			return -1;
339		return 0;
340	}
341
342	/*
343	 * Loop through all the program headers.
344	 */
345	for ( ; num; num--) {
346		if (pread(fd, xph_addr, xph_sizeof, off) < (ssize_t)xph_sizeof) {
347			file_badread(ms);
348			return -1;
349		}
350		off += size;
351
352		if (fsize != SIZE_UNKNOWN && xph_offset > fsize) {
353			/* Perhaps warn here */
354			continue;
355		}
356
357		if (xph_type != PT_NOTE)
358			continue;
359
360		/*
361		 * This is a PT_NOTE section; loop through all the notes
362		 * in the section.
363		 */
364		len = xph_filesz < sizeof(nbuf) ? xph_filesz : sizeof(nbuf);
365		if ((bufsize = pread(fd, nbuf, len, xph_offset)) == -1) {
366			file_badread(ms);
367			return -1;
368		}
369		offset = 0;
370		for (;;) {
371			if (offset >= (size_t)bufsize)
372				break;
373			offset = donote(ms, nbuf, offset, (size_t)bufsize,
374			    clazz, swap, 4, flags, notecount, fd, ph_off,
375			    ph_num, fsize);
376			if (offset == 0)
377				break;
378
379		}
380	}
381	return 0;
382}
383#endif
384
385static void
386do_note_netbsd_version(struct magic_set *ms, int swap, void *v)
387{
388	uint32_t desc;
389	(void)memcpy(&desc, v, sizeof(desc));
390	desc = elf_getu32(swap, desc);
391
392	if (file_printf(ms, ", for NetBSD") == -1)
393		return;
394	/*
395	 * The version number used to be stuck as 199905, and was thus
396	 * basically content-free.  Newer versions of NetBSD have fixed
397	 * this and now use the encoding of __NetBSD_Version__:
398	 *
399	 *	MMmmrrpp00
400	 *
401	 * M = major version
402	 * m = minor version
403	 * r = release ["",A-Z,Z[A-Z] but numeric]
404	 * p = patchlevel
405	 */
406	if (desc > 100000000U) {
407		uint32_t ver_patch = (desc / 100) % 100;
408		uint32_t ver_rel = (desc / 10000) % 100;
409		uint32_t ver_min = (desc / 1000000) % 100;
410		uint32_t ver_maj = desc / 100000000;
411
412		if (file_printf(ms, " %u.%u", ver_maj, ver_min) == -1)
413			return;
414		if (ver_rel == 0 && ver_patch != 0) {
415			if (file_printf(ms, ".%u", ver_patch) == -1)
416				return;
417		} else if (ver_rel != 0) {
418			while (ver_rel > 26) {
419				if (file_printf(ms, "Z") == -1)
420					return;
421				ver_rel -= 26;
422			}
423			if (file_printf(ms, "%c", 'A' + ver_rel - 1)
424			    == -1)
425				return;
426		}
427	}
428}
429
430static void
431do_note_freebsd_version(struct magic_set *ms, int swap, void *v)
432{
433	uint32_t desc;
434
435	(void)memcpy(&desc, v, sizeof(desc));
436	desc = elf_getu32(swap, desc);
437	if (file_printf(ms, ", for FreeBSD") == -1)
438		return;
439
440	/*
441	 * Contents is __FreeBSD_version, whose relation to OS
442	 * versions is defined by a huge table in the Porter's
443	 * Handbook.  This is the general scheme:
444	 *
445	 * Releases:
446	 * 	Mmp000 (before 4.10)
447	 * 	Mmi0p0 (before 5.0)
448	 * 	Mmm0p0
449	 *
450	 * Development branches:
451	 * 	Mmpxxx (before 4.6)
452	 * 	Mmp1xx (before 4.10)
453	 * 	Mmi1xx (before 5.0)
454	 * 	M000xx (pre-M.0)
455	 * 	Mmm1xx
456	 *
457	 * M = major version
458	 * m = minor version
459	 * i = minor version increment (491000 -> 4.10)
460	 * p = patchlevel
461	 * x = revision
462	 *
463	 * The first release of FreeBSD to use ELF by default
464	 * was version 3.0.
465	 */
466	if (desc == 460002) {
467		if (file_printf(ms, " 4.6.2") == -1)
468			return;
469	} else if (desc < 460100) {
470		if (file_printf(ms, " %d.%d", desc / 100000,
471		    desc / 10000 % 10) == -1)
472			return;
473		if (desc / 1000 % 10 > 0)
474			if (file_printf(ms, ".%d", desc / 1000 % 10) == -1)
475				return;
476		if ((desc % 1000 > 0) || (desc % 100000 == 0))
477			if (file_printf(ms, " (%d)", desc) == -1)
478				return;
479	} else if (desc < 500000) {
480		if (file_printf(ms, " %d.%d", desc / 100000,
481		    desc / 10000 % 10 + desc / 1000 % 10) == -1)
482			return;
483		if (desc / 100 % 10 > 0) {
484			if (file_printf(ms, " (%d)", desc) == -1)
485				return;
486		} else if (desc / 10 % 10 > 0) {
487			if (file_printf(ms, ".%d", desc / 10 % 10) == -1)
488				return;
489		}
490	} else {
491		if (file_printf(ms, " %d.%d", desc / 100000,
492		    desc / 1000 % 100) == -1)
493			return;
494		if ((desc / 100 % 10 > 0) ||
495		    (desc % 100000 / 100 == 0)) {
496			if (file_printf(ms, " (%d)", desc) == -1)
497				return;
498		} else if (desc / 10 % 10 > 0) {
499			if (file_printf(ms, ".%d", desc / 10 % 10) == -1)
500				return;
501		}
502	}
503}
504
505private int
506/*ARGSUSED*/
507do_bid_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type,
508    int swap __attribute__((__unused__)), uint32_t namesz, uint32_t descsz,
509    size_t noff, size_t doff, int *flags)
510{
511	if (namesz == 4 && strcmp((char *)&nbuf[noff], "GNU") == 0 &&
512	    type == NT_GNU_BUILD_ID && (descsz >= 4 && descsz <= 20)) {
513		uint8_t desc[20];
514		const char *btype;
515		uint32_t i;
516		*flags |= FLAGS_DID_BUILD_ID;
517		switch (descsz) {
518		case 8:
519		    btype = "xxHash";
520		    break;
521		case 16:
522		    btype = "md5/uuid";
523		    break;
524		case 20:
525		    btype = "sha1";
526		    break;
527		default:
528		    btype = "unknown";
529		    break;
530		}
531		if (file_printf(ms, ", BuildID[%s]=", btype) == -1)
532			return 1;
533		(void)memcpy(desc, &nbuf[doff], descsz);
534		for (i = 0; i < descsz; i++)
535		    if (file_printf(ms, "%02x", desc[i]) == -1)
536			return 1;
537		return 1;
538	}
539	return 0;
540}
541
542private int
543do_os_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type,
544    int swap, uint32_t namesz, uint32_t descsz,
545    size_t noff, size_t doff, int *flags)
546{
547	if (namesz == 5 && strcmp((char *)&nbuf[noff], "SuSE") == 0 &&
548	    type == NT_GNU_VERSION && descsz == 2) {
549	    *flags |= FLAGS_DID_OS_NOTE;
550	    file_printf(ms, ", for SuSE %d.%d", nbuf[doff], nbuf[doff + 1]);
551	    return 1;
552	}
553
554	if (namesz == 4 && strcmp((char *)&nbuf[noff], "GNU") == 0 &&
555	    type == NT_GNU_VERSION && descsz == 16) {
556		uint32_t desc[4];
557		(void)memcpy(desc, &nbuf[doff], sizeof(desc));
558
559		*flags |= FLAGS_DID_OS_NOTE;
560		if (file_printf(ms, ", for GNU/") == -1)
561			return 1;
562		switch (elf_getu32(swap, desc[0])) {
563		case GNU_OS_LINUX:
564			if (file_printf(ms, "Linux") == -1)
565				return 1;
566			break;
567		case GNU_OS_HURD:
568			if (file_printf(ms, "Hurd") == -1)
569				return 1;
570			break;
571		case GNU_OS_SOLARIS:
572			if (file_printf(ms, "Solaris") == -1)
573				return 1;
574			break;
575		case GNU_OS_KFREEBSD:
576			if (file_printf(ms, "kFreeBSD") == -1)
577				return 1;
578			break;
579		case GNU_OS_KNETBSD:
580			if (file_printf(ms, "kNetBSD") == -1)
581				return 1;
582			break;
583		default:
584			if (file_printf(ms, "<unknown>") == -1)
585				return 1;
586		}
587		if (file_printf(ms, " %d.%d.%d", elf_getu32(swap, desc[1]),
588		    elf_getu32(swap, desc[2]), elf_getu32(swap, desc[3])) == -1)
589			return 1;
590		return 1;
591	}
592
593	if (namesz == 7 && strcmp((char *)&nbuf[noff], "NetBSD") == 0) {
594	    	if (type == NT_NETBSD_VERSION && descsz == 4) {
595			*flags |= FLAGS_DID_OS_NOTE;
596			do_note_netbsd_version(ms, swap, &nbuf[doff]);
597			return 1;
598		}
599	}
600
601	if (namesz == 8 && strcmp((char *)&nbuf[noff], "FreeBSD") == 0) {
602	    	if (type == NT_FREEBSD_VERSION && descsz == 4) {
603			*flags |= FLAGS_DID_OS_NOTE;
604			do_note_freebsd_version(ms, swap, &nbuf[doff]);
605			return 1;
606		}
607	}
608
609	if (namesz == 8 && strcmp((char *)&nbuf[noff], "OpenBSD") == 0 &&
610	    type == NT_OPENBSD_VERSION && descsz == 4) {
611		*flags |= FLAGS_DID_OS_NOTE;
612		if (file_printf(ms, ", for OpenBSD") == -1)
613			return 1;
614		/* Content of note is always 0 */
615		return 1;
616	}
617
618	if (namesz == 10 && strcmp((char *)&nbuf[noff], "DragonFly") == 0 &&
619	    type == NT_DRAGONFLY_VERSION && descsz == 4) {
620		uint32_t desc;
621		*flags |= FLAGS_DID_OS_NOTE;
622		if (file_printf(ms, ", for DragonFly") == -1)
623			return 1;
624		(void)memcpy(&desc, &nbuf[doff], sizeof(desc));
625		desc = elf_getu32(swap, desc);
626		if (file_printf(ms, " %d.%d.%d", desc / 100000,
627		    desc / 10000 % 10, desc % 10000) == -1)
628			return 1;
629		return 1;
630	}
631	return 0;
632}
633
634private int
635do_pax_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type,
636    int swap, uint32_t namesz, uint32_t descsz,
637    size_t noff, size_t doff, int *flags)
638{
639	if (namesz == 4 && strcmp((char *)&nbuf[noff], "PaX") == 0 &&
640	    type == NT_NETBSD_PAX && descsz == 4) {
641		static const char *pax[] = {
642		    "+mprotect",
643		    "-mprotect",
644		    "+segvguard",
645		    "-segvguard",
646		    "+ASLR",
647		    "-ASLR",
648		};
649		uint32_t desc;
650		size_t i;
651		int did = 0;
652
653		*flags |= FLAGS_DID_NETBSD_PAX;
654		(void)memcpy(&desc, &nbuf[doff], sizeof(desc));
655		desc = elf_getu32(swap, desc);
656
657		if (desc && file_printf(ms, ", PaX: ") == -1)
658			return 1;
659
660		for (i = 0; i < __arraycount(pax); i++) {
661			if (((1 << (int)i) & desc) == 0)
662				continue;
663			if (file_printf(ms, "%s%s", did++ ? "," : "",
664			    pax[i]) == -1)
665				return 1;
666		}
667		return 1;
668	}
669	return 0;
670}
671
672private int
673do_core_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type,
674    int swap, uint32_t namesz, uint32_t descsz,
675    size_t noff, size_t doff, int *flags, size_t size, int clazz)
676{
677#ifdef ELFCORE
678	int os_style = -1;
679	/*
680	 * Sigh.  The 2.0.36 kernel in Debian 2.1, at
681	 * least, doesn't correctly implement name
682	 * sections, in core dumps, as specified by
683	 * the "Program Linking" section of "UNIX(R) System
684	 * V Release 4 Programmer's Guide: ANSI C and
685	 * Programming Support Tools", because my copy
686	 * clearly says "The first 'namesz' bytes in 'name'
687	 * contain a *null-terminated* [emphasis mine]
688	 * character representation of the entry's owner
689	 * or originator", but the 2.0.36 kernel code
690	 * doesn't include the terminating null in the
691	 * name....
692	 */
693	if ((namesz == 4 && strncmp((char *)&nbuf[noff], "CORE", 4) == 0) ||
694	    (namesz == 5 && strcmp((char *)&nbuf[noff], "CORE") == 0)) {
695		os_style = OS_STYLE_SVR4;
696	}
697
698	if ((namesz == 8 && strcmp((char *)&nbuf[noff], "FreeBSD") == 0)) {
699		os_style = OS_STYLE_FREEBSD;
700	}
701
702	if ((namesz >= 11 && strncmp((char *)&nbuf[noff], "NetBSD-CORE", 11)
703	    == 0)) {
704		os_style = OS_STYLE_NETBSD;
705	}
706
707	if (os_style != -1 && (*flags & FLAGS_DID_CORE_STYLE) == 0) {
708		if (file_printf(ms, ", %s-style", os_style_names[os_style])
709		    == -1)
710			return 1;
711		*flags |= FLAGS_DID_CORE_STYLE;
712	}
713
714	switch (os_style) {
715	case OS_STYLE_NETBSD:
716		if (type == NT_NETBSD_CORE_PROCINFO) {
717			char sbuf[512];
718			uint32_t signo;
719			/*
720			 * Extract the program name.  It is at
721			 * offset 0x7c, and is up to 32-bytes,
722			 * including the terminating NUL.
723			 */
724			if (file_printf(ms, ", from '%.31s'",
725			    file_printable(sbuf, sizeof(sbuf),
726			    (const char *)&nbuf[doff + 0x7c])) == -1)
727				return 1;
728
729			/*
730			 * Extract the signal number.  It is at
731			 * offset 0x08.
732			 */
733			(void)memcpy(&signo, &nbuf[doff + 0x08],
734			    sizeof(signo));
735			if (file_printf(ms, " (signal %u)",
736			    elf_getu32(swap, signo)) == -1)
737				return 1;
738			*flags |= FLAGS_DID_CORE;
739			return 1;
740		}
741		break;
742
743	default:
744		if (type == NT_PRPSINFO && *flags & FLAGS_IS_CORE) {
745			size_t i, j;
746			unsigned char c;
747			/*
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).
751			 *
752			 * Unfortunately, it's at a different offset
753			 * in various OSes, so try multiple offsets.
754			 * If the characters aren't all printable,
755			 * reject it.
756			 */
757			for (i = 0; i < NOFFSETS; i++) {
758				unsigned char *cname, *cp;
759				size_t reloffset = prpsoffsets(i);
760				size_t noffset = doff + reloffset;
761				size_t k;
762				for (j = 0; j < 16; j++, noffset++,
763				    reloffset++) {
764					/*
765					 * Make sure we're not past
766					 * the end of the buffer; if
767					 * we are, just give up.
768					 */
769					if (noffset >= size)
770						goto tryanother;
771
772					/*
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.
777					 */
778					if (reloffset >= descsz)
779						goto tryanother;
780
781					c = nbuf[noffset];
782					if (c == '\0') {
783						/*
784						 * A '\0' at the
785						 * beginning is
786						 * obviously wrong.
787						 * Any other '\0'
788						 * means we're done.
789						 */
790						if (j == 0)
791							goto tryanother;
792						else
793							break;
794					} else {
795						/*
796						 * A nonprintable
797						 * character is also
798						 * wrong.
799						 */
800						if (!isprint(c) || isquote(c))
801							goto tryanother;
802					}
803				}
804				/*
805				 * Well, that worked.
806				 */
807
808				/*
809				 * Try next offsets, in case this match is
810				 * in the middle of a string.
811				 */
812				for (k = i + 1 ; k < NOFFSETS; k++) {
813					size_t no;
814					int adjust = 1;
815					if (prpsoffsets(k) >= prpsoffsets(i))
816						continue;
817					for (no = doff + prpsoffsets(k);
818					     no < doff + prpsoffsets(i); no++)
819						adjust = adjust
820						         && isprint(nbuf[no]);
821					if (adjust)
822						i = k;
823				}
824
825				cname = (unsigned char *)
826				    &nbuf[doff + prpsoffsets(i)];
827				for (cp = cname; *cp && isprint(*cp); cp++)
828					continue;
829				/*
830				 * Linux apparently appends a space at the end
831				 * of the command line: remove it.
832				 */
833				while (cp > cname && isspace(cp[-1]))
834					cp--;
835				if (file_printf(ms, ", from '%.*s'",
836				    (int)(cp - cname), cname) == -1)
837					return 1;
838				*flags |= FLAGS_DID_CORE;
839				return 1;
840
841			tryanother:
842				;
843			}
844		}
845		break;
846	}
847#endif
848	return 0;
849}
850
851private off_t
852get_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)
854{
855	Elf32_Phdr ph32;
856	Elf64_Phdr ph64;
857
858	/*
859	 * Loop through all the program headers and find the header with
860	 * virtual address in which the "virtaddr" belongs to.
861	 */
862	for ( ; num; num--) {
863		if (pread(fd, xph_addr, xph_sizeof, off) < (ssize_t)xph_sizeof) {
864			file_badread(ms);
865			return -1;
866		}
867		off += xph_sizeof;
868
869		if (fsize != SIZE_UNKNOWN && xph_offset > fsize) {
870			/* Perhaps warn here */
871			continue;
872		}
873
874		if (virtaddr >= xph_vaddr && virtaddr < xph_vaddr + xph_filesz)
875			return xph_offset + (virtaddr - xph_vaddr);
876	}
877	return 0;
878}
879
880private size_t
881get_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)
884{
885	char *bptr;
886	off_t offset;
887
888	if (buflen == 0)
889		return 0;
890
891	offset = get_offset_from_virtaddr(ms, swap, clazz, fd, ph_off, ph_num,
892	    fsize, virtaddr);
893	if ((buflen = pread(fd, buf, buflen, offset)) <= 0) {
894		file_badread(ms);
895		return 0;
896	}
897
898	buf[buflen - 1] = '\0';
899
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++)
903		continue;
904	if (*bptr != '\0')
905		return 0;
906
907	return bptr - buf;
908}
909
910
911private int
912do_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)
918{
919#ifdef ELFCORE
920	Aux32Info auxv32;
921	Aux64Info auxv64;
922	size_t elsize = xauxv_sizeof;
923	const char *tag;
924	int is_string;
925	size_t nval;
926
927	if (type != NT_AUXV || (*flags & FLAGS_IS_CORE) == 0)
928		return 0;
929
930	*flags |= FLAGS_DID_AUXV;
931
932	nval = 0;
933	for (size_t off = 0; off + elsize <= descsz; off += elsize) {
934		(void)memcpy(xauxv_addr, &nbuf[doff + off], xauxv_sizeof);
935		/* Limit processing to 50 vector entries to prevent DoS */
936		if (nval++ >= 50) {
937			file_error(ms, 0, "Too many ELF Auxv elements");
938			return 1;
939		}
940
941		switch(xauxv_type) {
942		case AT_LINUX_EXECFN:
943			is_string = 1;
944			tag = "execfn";
945			break;
946		case AT_LINUX_PLATFORM:
947			is_string = 1;
948			tag = "platform";
949			break;
950		case AT_LINUX_UID:
951			is_string = 0;
952			tag = "real uid";
953			break;
954		case AT_LINUX_GID:
955			is_string = 0;
956			tag = "real gid";
957			break;
958		case AT_LINUX_EUID:
959			is_string = 0;
960			tag = "effective uid";
961			break;
962		case AT_LINUX_EGID:
963			is_string = 0;
964			tag = "effective gid";
965			break;
966		default:
967			is_string = 0;
968			tag = NULL;
969			break;
970		}
971
972		if (tag == NULL)
973			continue;
974
975		if (is_string) {
976			char buf[256];
977			ssize_t buflen;
978			buflen = get_string_on_virtaddr(ms, swap, clazz, fd,
979			    ph_off, ph_num, fsize, xauxv_val, buf, sizeof(buf));
980
981			if (buflen == 0)
982				continue;
983
984			if (file_printf(ms, ", %s: '%s'", tag, buf) == -1)
985				return 0;
986		} else {
987			if (file_printf(ms, ", %s: %d", tag, (int) xauxv_val)
988			    == -1)
989				return 0;
990		}
991	}
992	return 1;
993#else
994	return 0;
995#endif
996}
997
998private size_t
999donote(struct magic_set *ms, void *vbuf, size_t offset, size_t size,
1000    int clazz, int swap, size_t align, int *flags, uint16_t *notecount,
1001    int fd, off_t ph_off, int ph_num, off_t fsize)
1002{
1003	Elf32_Nhdr nh32;
1004	Elf64_Nhdr nh64;
1005	size_t noff, doff;
1006	uint32_t namesz, descsz;
1007	unsigned char *nbuf = CAST(unsigned char *, vbuf);
1008
1009	if (*notecount == 0)
1010		return 0;
1011	--*notecount;
1012
1013	if (xnh_sizeof + offset > size) {
1014		/*
1015		 * We're out of note headers.
1016		 */
1017		return xnh_sizeof + offset;
1018	}
1019
1020	(void)memcpy(xnh_addr, &nbuf[offset], xnh_sizeof);
1021	offset += xnh_sizeof;
1022
1023	namesz = xnh_namesz;
1024	descsz = xnh_descsz;
1025
1026	if ((namesz == 0) && (descsz == 0)) {
1027		/*
1028		 * We're out of note headers.
1029		 */
1030		return (offset >= size) ? offset : size;
1031	}
1032
1033	if (namesz & 0x80000000) {
1034	    (void)file_printf(ms, ", bad note name size 0x%lx",
1035		(unsigned long)namesz);
1036	    return 0;
1037	}
1038
1039	if (descsz & 0x80000000) {
1040	    (void)file_printf(ms, ", bad note description size 0x%lx",
1041		(unsigned long)descsz);
1042	    return 0;
1043	}
1044
1045	noff = offset;
1046	doff = ELF_ALIGN(offset + namesz);
1047
1048	if (offset + namesz > size) {
1049		/*
1050		 * We're past the end of the buffer.
1051		 */
1052		return doff;
1053	}
1054
1055	offset = ELF_ALIGN(doff + descsz);
1056	if (doff + descsz > size) {
1057		/*
1058		 * We're past the end of the buffer.
1059		 */
1060		return (offset >= size) ? offset : size;
1061	}
1062
1063
1064	if ((*flags & FLAGS_DID_OS_NOTE) == 0) {
1065		if (do_os_note(ms, nbuf, xnh_type, swap,
1066		    namesz, descsz, noff, doff, flags))
1067			return offset;
1068	}
1069
1070	if ((*flags & FLAGS_DID_BUILD_ID) == 0) {
1071		if (do_bid_note(ms, nbuf, xnh_type, swap,
1072		    namesz, descsz, noff, doff, flags))
1073			return offset;
1074	}
1075
1076	if ((*flags & FLAGS_DID_NETBSD_PAX) == 0) {
1077		if (do_pax_note(ms, nbuf, xnh_type, swap,
1078		    namesz, descsz, noff, doff, flags))
1079			return offset;
1080	}
1081
1082	if ((*flags & FLAGS_DID_CORE) == 0) {
1083		if (do_core_note(ms, nbuf, xnh_type, swap,
1084		    namesz, descsz, noff, doff, flags, size, clazz))
1085			return offset;
1086	}
1087
1088	if ((*flags & FLAGS_DID_AUXV) == 0) {
1089		if (do_auxv_note(ms, nbuf, xnh_type, swap,
1090			namesz, descsz, noff, doff, flags, size, clazz,
1091			fd, ph_off, ph_num, fsize))
1092			return offset;
1093	}
1094
1095	if (namesz == 7 && strcmp((char *)&nbuf[noff], "NetBSD") == 0) {
1096		if (descsz > 100)
1097			descsz = 100;
1098		switch (xnh_type) {
1099	    	case NT_NETBSD_VERSION:
1100			return offset;
1101		case NT_NETBSD_MARCH:
1102			if (*flags & FLAGS_DID_NETBSD_MARCH)
1103				return offset;
1104			*flags |= FLAGS_DID_NETBSD_MARCH;
1105			if (file_printf(ms, ", compiled for: %.*s",
1106			    (int)descsz, (const char *)&nbuf[doff]) == -1)
1107				return offset;
1108			break;
1109		case NT_NETBSD_CMODEL:
1110			if (*flags & FLAGS_DID_NETBSD_CMODEL)
1111				return offset;
1112			*flags |= FLAGS_DID_NETBSD_CMODEL;
1113			if (file_printf(ms, ", compiler model: %.*s",
1114			    (int)descsz, (const char *)&nbuf[doff]) == -1)
1115				return offset;
1116			break;
1117		default:
1118			if (*flags & FLAGS_DID_NETBSD_UNKNOWN)
1119				return offset;
1120			*flags |= FLAGS_DID_NETBSD_UNKNOWN;
1121			if (file_printf(ms, ", note=%u", xnh_type) == -1)
1122				return offset;
1123			break;
1124		}
1125		return offset;
1126	}
1127
1128	return offset;
1129}
1130
1131/* SunOS 5.x hardware capability descriptions */
1132typedef struct cap_desc {
1133	uint64_t cd_mask;
1134	const char *cd_name;
1135} cap_desc_t;
1136
1137static const cap_desc_t cap_desc_sparc[] = {
1138	{ AV_SPARC_MUL32,		"MUL32" },
1139	{ AV_SPARC_DIV32,		"DIV32" },
1140	{ AV_SPARC_FSMULD,		"FSMULD" },
1141	{ AV_SPARC_V8PLUS,		"V8PLUS" },
1142	{ AV_SPARC_POPC,		"POPC" },
1143	{ AV_SPARC_VIS,			"VIS" },
1144	{ AV_SPARC_VIS2,		"VIS2" },
1145	{ AV_SPARC_ASI_BLK_INIT,	"ASI_BLK_INIT" },
1146	{ AV_SPARC_FMAF,		"FMAF" },
1147	{ AV_SPARC_FJFMAU,		"FJFMAU" },
1148	{ AV_SPARC_IMA,			"IMA" },
1149	{ 0, NULL }
1150};
1151
1152static const cap_desc_t cap_desc_386[] = {
1153	{ AV_386_FPU,			"FPU" },
1154	{ AV_386_TSC,			"TSC" },
1155	{ AV_386_CX8,			"CX8" },
1156	{ AV_386_SEP,			"SEP" },
1157	{ AV_386_AMD_SYSC,		"AMD_SYSC" },
1158	{ AV_386_CMOV,			"CMOV" },
1159	{ AV_386_MMX,			"MMX" },
1160	{ AV_386_AMD_MMX,		"AMD_MMX" },
1161	{ AV_386_AMD_3DNow,		"AMD_3DNow" },
1162	{ AV_386_AMD_3DNowx,		"AMD_3DNowx" },
1163	{ AV_386_FXSR,			"FXSR" },
1164	{ AV_386_SSE,			"SSE" },
1165	{ AV_386_SSE2,			"SSE2" },
1166	{ AV_386_PAUSE,			"PAUSE" },
1167	{ AV_386_SSE3,			"SSE3" },
1168	{ AV_386_MON,			"MON" },
1169	{ AV_386_CX16,			"CX16" },
1170	{ AV_386_AHF,			"AHF" },
1171	{ AV_386_TSCP,			"TSCP" },
1172	{ AV_386_AMD_SSE4A,		"AMD_SSE4A" },
1173	{ AV_386_POPCNT,		"POPCNT" },
1174	{ AV_386_AMD_LZCNT,		"AMD_LZCNT" },
1175	{ AV_386_SSSE3,			"SSSE3" },
1176	{ AV_386_SSE4_1,		"SSE4.1" },
1177	{ AV_386_SSE4_2,		"SSE4.2" },
1178	{ 0, NULL }
1179};
1180
1181private int
1182doshn(struct magic_set *ms, int clazz, int swap, int fd, off_t off, int num,
1183    size_t size, off_t fsize, int mach, int strtab, int *flags,
1184    uint16_t *notecount)
1185{
1186	Elf32_Shdr sh32;
1187	Elf64_Shdr sh64;
1188	int stripped = 1;
1189	size_t nbadcap = 0;
1190	void *nbuf;
1191	off_t noff, coff, name_off;
1192	uint64_t cap_hw1 = 0;	/* SunOS 5.x hardware capabilites */
1193	uint64_t cap_sf1 = 0;	/* SunOS 5.x software capabilites */
1194	char name[50];
1195	ssize_t namesize;
1196
1197	if (size != xsh_sizeof) {
1198		if (file_printf(ms, ", corrupted section header size") == -1)
1199			return -1;
1200		return 0;
1201	}
1202
1203	/* Read offset of name section to be able to read section names later */
1204	if (pread(fd, xsh_addr, xsh_sizeof, CAST(off_t, (off + size * strtab)))
1205	    < (ssize_t)xsh_sizeof) {
1206		file_badread(ms);
1207		return -1;
1208	}
1209	name_off = xsh_offset;
1210
1211	for ( ; num; num--) {
1212		/* Read the name of this section. */
1213		if ((namesize = pread(fd, name, sizeof(name) - 1, name_off + xsh_name)) == -1) {
1214			file_badread(ms);
1215			return -1;
1216		}
1217		name[namesize] = '\0';
1218		if (strcmp(name, ".debug_info") == 0)
1219			stripped = 0;
1220
1221		if (pread(fd, xsh_addr, xsh_sizeof, off) < (ssize_t)xsh_sizeof) {
1222			file_badread(ms);
1223			return -1;
1224		}
1225		off += size;
1226
1227		/* Things we can determine before we seek */
1228		switch (xsh_type) {
1229		case SHT_SYMTAB:
1230#if 0
1231		case SHT_DYNSYM:
1232#endif
1233			stripped = 0;
1234			break;
1235		default:
1236			if (fsize != SIZE_UNKNOWN && xsh_offset > fsize) {
1237				/* Perhaps warn here */
1238				continue;
1239			}
1240			break;
1241		}
1242
1243
1244		/* Things we can determine when we seek */
1245		switch (xsh_type) {
1246		case SHT_NOTE:
1247			if ((uintmax_t)(xsh_size + xsh_offset) >
1248			    (uintmax_t)fsize) {
1249				if (file_printf(ms,
1250				    ", note offset/size 0x%" INTMAX_T_FORMAT
1251				    "x+0x%" INTMAX_T_FORMAT "x exceeds"
1252				    " file size 0x%" INTMAX_T_FORMAT "x",
1253				    (uintmax_t)xsh_offset, (uintmax_t)xsh_size,
1254				    (uintmax_t)fsize) == -1)
1255					return -1;
1256				return 0;
1257			}
1258			if ((nbuf = malloc(xsh_size)) == NULL) {
1259				file_error(ms, errno, "Cannot allocate memory"
1260				    " for note");
1261				return -1;
1262			}
1263			if (pread(fd, nbuf, xsh_size, xsh_offset) <
1264			    (ssize_t)xsh_size) {
1265				file_badread(ms);
1266				free(nbuf);
1267				return -1;
1268			}
1269
1270			noff = 0;
1271			for (;;) {
1272				if (noff >= (off_t)xsh_size)
1273					break;
1274				noff = donote(ms, nbuf, (size_t)noff,
1275				    xsh_size, clazz, swap, 4, flags, notecount,
1276				    fd, 0, 0, 0);
1277				if (noff == 0)
1278					break;
1279			}
1280			free(nbuf);
1281			break;
1282		case SHT_SUNW_cap:
1283			switch (mach) {
1284			case EM_SPARC:
1285			case EM_SPARCV9:
1286			case EM_IA_64:
1287			case EM_386:
1288			case EM_AMD64:
1289				break;
1290			default:
1291				goto skip;
1292			}
1293
1294			if (nbadcap > 5)
1295				break;
1296			if (lseek(fd, xsh_offset, SEEK_SET) == (off_t)-1) {
1297				file_badseek(ms);
1298				return -1;
1299			}
1300			coff = 0;
1301			for (;;) {
1302				Elf32_Cap cap32;
1303				Elf64_Cap cap64;
1304				char cbuf[/*CONSTCOND*/
1305				    MAX(sizeof cap32, sizeof cap64)];
1306				if ((coff += xcap_sizeof) > (off_t)xsh_size)
1307					break;
1308				if (read(fd, cbuf, (size_t)xcap_sizeof) !=
1309				    (ssize_t)xcap_sizeof) {
1310					file_badread(ms);
1311					return -1;
1312				}
1313				if (cbuf[0] == 'A') {
1314#ifdef notyet
1315					char *p = cbuf + 1;
1316					uint32_t len, tag;
1317					memcpy(&len, p, sizeof(len));
1318					p += 4;
1319					len = getu32(swap, len);
1320					if (memcmp("gnu", p, 3) != 0) {
1321					    if (file_printf(ms,
1322						", unknown capability %.3s", p)
1323						== -1)
1324						return -1;
1325					    break;
1326					}
1327					p += strlen(p) + 1;
1328					tag = *p++;
1329					memcpy(&len, p, sizeof(len));
1330					p += 4;
1331					len = getu32(swap, len);
1332					if (tag != 1) {
1333					    if (file_printf(ms, ", unknown gnu"
1334						" capability tag %d", tag)
1335						== -1)
1336						return -1;
1337					    break;
1338					}
1339					// gnu attributes
1340#endif
1341					break;
1342				}
1343				(void)memcpy(xcap_addr, cbuf, xcap_sizeof);
1344				switch (xcap_tag) {
1345				case CA_SUNW_NULL:
1346					break;
1347				case CA_SUNW_HW_1:
1348					cap_hw1 |= xcap_val;
1349					break;
1350				case CA_SUNW_SF_1:
1351					cap_sf1 |= xcap_val;
1352					break;
1353				default:
1354					if (file_printf(ms,
1355					    ", with unknown capability "
1356					    "0x%" INT64_T_FORMAT "x = 0x%"
1357					    INT64_T_FORMAT "x",
1358					    (unsigned long long)xcap_tag,
1359					    (unsigned long long)xcap_val) == -1)
1360						return -1;
1361					if (nbadcap++ > 2)
1362						coff = xsh_size;
1363					break;
1364				}
1365			}
1366			/*FALLTHROUGH*/
1367		skip:
1368		default:
1369			break;
1370		}
1371	}
1372
1373	if (file_printf(ms, ", %sstripped", stripped ? "" : "not ") == -1)
1374		return -1;
1375	if (cap_hw1) {
1376		const cap_desc_t *cdp;
1377		switch (mach) {
1378		case EM_SPARC:
1379		case EM_SPARC32PLUS:
1380		case EM_SPARCV9:
1381			cdp = cap_desc_sparc;
1382			break;
1383		case EM_386:
1384		case EM_IA_64:
1385		case EM_AMD64:
1386			cdp = cap_desc_386;
1387			break;
1388		default:
1389			cdp = NULL;
1390			break;
1391		}
1392		if (file_printf(ms, ", uses") == -1)
1393			return -1;
1394		if (cdp) {
1395			while (cdp->cd_name) {
1396				if (cap_hw1 & cdp->cd_mask) {
1397					if (file_printf(ms,
1398					    " %s", cdp->cd_name) == -1)
1399						return -1;
1400					cap_hw1 &= ~cdp->cd_mask;
1401				}
1402				++cdp;
1403			}
1404			if (cap_hw1)
1405				if (file_printf(ms,
1406				    " unknown hardware capability 0x%"
1407				    INT64_T_FORMAT "x",
1408				    (unsigned long long)cap_hw1) == -1)
1409					return -1;
1410		} else {
1411			if (file_printf(ms,
1412			    " hardware capability 0x%" INT64_T_FORMAT "x",
1413			    (unsigned long long)cap_hw1) == -1)
1414				return -1;
1415		}
1416	}
1417	if (cap_sf1) {
1418		if (cap_sf1 & SF1_SUNW_FPUSED) {
1419			if (file_printf(ms,
1420			    (cap_sf1 & SF1_SUNW_FPKNWN)
1421			    ? ", uses frame pointer"
1422			    : ", not known to use frame pointer") == -1)
1423				return -1;
1424		}
1425		cap_sf1 &= ~SF1_SUNW_MASK;
1426		if (cap_sf1)
1427			if (file_printf(ms,
1428			    ", with unknown software capability 0x%"
1429			    INT64_T_FORMAT "x",
1430			    (unsigned long long)cap_sf1) == -1)
1431				return -1;
1432	}
1433	return 0;
1434}
1435
1436/*
1437 * Look through the program headers of an executable image, searching
1438 * for a PT_INTERP section; if one is found, it's dynamically linked,
1439 * otherwise it's statically linked.
1440 */
1441private int
1442dophn_exec(struct magic_set *ms, int clazz, int swap, int fd, off_t off,
1443    int num, size_t size, off_t fsize, int sh_num, int *flags,
1444    uint16_t *notecount)
1445{
1446	Elf32_Phdr ph32;
1447	Elf64_Phdr ph64;
1448	const char *linking_style = "statically";
1449	const char *interp = "";
1450	unsigned char nbuf[BUFSIZ];
1451	char ibuf[BUFSIZ];
1452	ssize_t bufsize;
1453	size_t offset, align, len;
1454
1455	if (size != xph_sizeof) {
1456		if (file_printf(ms, ", corrupted program header size") == -1)
1457			return -1;
1458		return 0;
1459	}
1460
1461  	for ( ; num; num--) {
1462		if (pread(fd, xph_addr, xph_sizeof, off) < (ssize_t)xph_sizeof) {
1463			file_badread(ms);
1464			return -1;
1465		}
1466
1467		off += size;
1468		bufsize = 0;
1469		align = 4;
1470
1471		/* Things we can determine before we seek */
1472		switch (xph_type) {
1473		case PT_DYNAMIC:
1474			linking_style = "dynamically";
1475			break;
1476		case PT_NOTE:
1477			if (sh_num)	/* Did this through section headers */
1478				continue;
1479			if (((align = xph_align) & 0x80000000UL) != 0 ||
1480			    align < 4) {
1481				if (file_printf(ms,
1482				    ", invalid note alignment 0x%lx",
1483				    (unsigned long)align) == -1)
1484					return -1;
1485				align = 4;
1486			}
1487			/*FALLTHROUGH*/
1488		case PT_INTERP:
1489			len = xph_filesz < sizeof(nbuf) ? xph_filesz
1490			    : sizeof(nbuf);
1491			bufsize = pread(fd, nbuf, len, xph_offset);
1492			if (bufsize == -1) {
1493				file_badread(ms);
1494				return -1;
1495			}
1496			break;
1497		default:
1498			if (fsize != SIZE_UNKNOWN && xph_offset > fsize) {
1499				/* Maybe warn here? */
1500				continue;
1501			}
1502			break;
1503		}
1504
1505		/* Things we can determine when we seek */
1506		switch (xph_type) {
1507		case PT_INTERP:
1508			if (bufsize && nbuf[0]) {
1509				nbuf[bufsize - 1] = '\0';
1510				interp = (const char *)nbuf;
1511			} else
1512				interp = "*empty*";
1513			break;
1514		case PT_NOTE:
1515			/*
1516			 * This is a PT_NOTE section; loop through all the notes
1517			 * in the section.
1518			 */
1519			offset = 0;
1520			for (;;) {
1521				if (offset >= (size_t)bufsize)
1522					break;
1523				offset = donote(ms, nbuf, offset,
1524				    (size_t)bufsize, clazz, swap, align,
1525				    flags, notecount, fd, 0, 0, 0);
1526				if (offset == 0)
1527					break;
1528			}
1529			break;
1530		default:
1531			break;
1532		}
1533	}
1534	if (file_printf(ms, ", %s linked", linking_style)
1535	    == -1)
1536		return -1;
1537	if (interp[0])
1538		if (file_printf(ms, ", interpreter %s",
1539		    file_printable(ibuf, sizeof(ibuf), interp)) == -1)
1540			return -1;
1541	return 0;
1542}
1543
1544
1545protected int
1546file_tryelf(struct magic_set *ms, int fd, const unsigned char *buf,
1547    size_t nbytes)
1548{
1549	union {
1550		int32_t l;
1551		char c[sizeof (int32_t)];
1552	} u;
1553	int clazz;
1554	int swap;
1555	struct stat st;
1556	off_t fsize;
1557	int flags = 0;
1558	Elf32_Ehdr elf32hdr;
1559	Elf64_Ehdr elf64hdr;
1560	uint16_t type, phnum, shnum, notecount;
1561
1562	if (ms->flags & (MAGIC_MIME|MAGIC_APPLE|MAGIC_EXTENSION))
1563		return 0;
1564	/*
1565	 * ELF executables have multiple section headers in arbitrary
1566	 * file locations and thus file(1) cannot determine it from easily.
1567	 * Instead we traverse thru all section headers until a symbol table
1568	 * one is found or else the binary is stripped.
1569	 * Return immediately if it's not ELF (so we avoid pipe2file unless needed).
1570	 */
1571	if (buf[EI_MAG0] != ELFMAG0
1572	    || (buf[EI_MAG1] != ELFMAG1 && buf[EI_MAG1] != OLFMAG1)
1573	    || buf[EI_MAG2] != ELFMAG2 || buf[EI_MAG3] != ELFMAG3)
1574		return 0;
1575
1576	/*
1577	 * If we cannot seek, it must be a pipe, socket or fifo.
1578	 */
1579	if((lseek(fd, (off_t)0, SEEK_SET) == (off_t)-1) && (errno == ESPIPE))
1580		fd = file_pipe2file(ms, fd, buf, nbytes);
1581
1582	if (fstat(fd, &st) == -1) {
1583  		file_badread(ms);
1584		return -1;
1585	}
1586	if (S_ISREG(st.st_mode) || st.st_size != 0)
1587		fsize = st.st_size;
1588	else
1589		fsize = SIZE_UNKNOWN;
1590
1591	clazz = buf[EI_CLASS];
1592
1593	switch (clazz) {
1594	case ELFCLASS32:
1595#undef elf_getu
1596#define elf_getu(a, b)	elf_getu32(a, b)
1597#undef elfhdr
1598#define elfhdr elf32hdr
1599#include "elfclass.h"
1600	case ELFCLASS64:
1601#undef elf_getu
1602#define elf_getu(a, b)	elf_getu64(a, b)
1603#undef elfhdr
1604#define elfhdr elf64hdr
1605#include "elfclass.h"
1606	default:
1607	    if (file_printf(ms, ", unknown class %d", clazz) == -1)
1608		    return -1;
1609	    break;
1610	}
1611	return 0;
1612}
1613#endif
1614