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1.1 misho 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 1.81 2008/11/04 16:38:28 christos Exp $")
31: #endif
32:
33: #ifdef BUILTIN_ELF
34: #include <string.h>
35: #include <ctype.h>
36: #include <stdlib.h>
37: #ifdef HAVE_UNISTD_H
38: #include <unistd.h>
39: #endif
40:
41: #include "readelf.h"
42: #include "magic.h"
43:
44: #ifdef ELFCORE
45: private int dophn_core(struct magic_set *, int, int, int, off_t, int, size_t,
46: off_t, int *);
47: #endif
48: private int dophn_exec(struct magic_set *, int, int, int, off_t, int, size_t,
49: off_t, int *, int);
50: private int doshn(struct magic_set *, int, int, int, off_t, int, size_t, int *,
51: int);
52: private size_t donote(struct magic_set *, unsigned char *, size_t, size_t, int,
53: int, size_t, int *);
54:
55: #define ELF_ALIGN(a) ((((a) + align - 1) / align) * align)
56:
57: #define isquote(c) (strchr("'\"`", (c)) != NULL)
58:
59: private uint16_t getu16(int, uint16_t);
60: private uint32_t getu32(int, uint32_t);
61: private uint64_t getu64(int, uint64_t);
62:
63: private uint16_t
64: getu16(int swap, uint16_t value)
65: {
66: union {
67: uint16_t ui;
68: char c[2];
69: } retval, tmpval;
70:
71: if (swap) {
72: tmpval.ui = value;
73:
74: retval.c[0] = tmpval.c[1];
75: retval.c[1] = tmpval.c[0];
76:
77: return retval.ui;
78: } else
79: return value;
80: }
81:
82: private uint32_t
83: getu32(int swap, uint32_t value)
84: {
85: union {
86: uint32_t ui;
87: char c[4];
88: } retval, tmpval;
89:
90: if (swap) {
91: tmpval.ui = value;
92:
93: retval.c[0] = tmpval.c[3];
94: retval.c[1] = tmpval.c[2];
95: retval.c[2] = tmpval.c[1];
96: retval.c[3] = tmpval.c[0];
97:
98: return retval.ui;
99: } else
100: return value;
101: }
102:
103: private uint64_t
104: getu64(int swap, uint64_t value)
105: {
106: union {
107: uint64_t ui;
108: char c[8];
109: } retval, tmpval;
110:
111: if (swap) {
112: tmpval.ui = value;
113:
114: retval.c[0] = tmpval.c[7];
115: retval.c[1] = tmpval.c[6];
116: retval.c[2] = tmpval.c[5];
117: retval.c[3] = tmpval.c[4];
118: retval.c[4] = tmpval.c[3];
119: retval.c[5] = tmpval.c[2];
120: retval.c[6] = tmpval.c[1];
121: retval.c[7] = tmpval.c[0];
122:
123: return retval.ui;
124: } else
125: return value;
126: }
127:
128: #define elf_getu16(swap, value) getu16(swap, value)
129: #define elf_getu32(swap, value) getu32(swap, value)
130: #ifdef USE_ARRAY_FOR_64BIT_TYPES
131: # define elf_getu64(swap, array) \
132: ((swap ? ((uint64_t)elf_getu32(swap, array[0])) << 32 : elf_getu32(swap, array[0])) + \
133: (swap ? elf_getu32(swap, array[1]) : ((uint64_t)elf_getu32(swap, array[1]) << 32)))
134: #else
135: # define elf_getu64(swap, value) getu64(swap, value)
136: #endif
137:
138: #define xsh_addr (clazz == ELFCLASS32 \
139: ? (void *) &sh32 \
140: : (void *) &sh64)
141: #define xsh_sizeof (clazz == ELFCLASS32 \
142: ? sizeof sh32 \
143: : sizeof sh64)
144: #define xsh_size (clazz == ELFCLASS32 \
145: ? elf_getu32(swap, sh32.sh_size) \
146: : elf_getu64(swap, sh64.sh_size))
147: #define xsh_offset (clazz == ELFCLASS32 \
148: ? elf_getu32(swap, sh32.sh_offset) \
149: : elf_getu64(swap, sh64.sh_offset))
150: #define xsh_type (clazz == ELFCLASS32 \
151: ? elf_getu32(swap, sh32.sh_type) \
152: : elf_getu32(swap, sh64.sh_type))
153: #define xph_addr (clazz == ELFCLASS32 \
154: ? (void *) &ph32 \
155: : (void *) &ph64)
156: #define xph_sizeof (clazz == ELFCLASS32 \
157: ? sizeof ph32 \
158: : sizeof ph64)
159: #define xph_type (clazz == ELFCLASS32 \
160: ? elf_getu32(swap, ph32.p_type) \
161: : elf_getu32(swap, ph64.p_type))
162: #define xph_offset (off_t)(clazz == ELFCLASS32 \
163: ? elf_getu32(swap, ph32.p_offset) \
164: : elf_getu64(swap, ph64.p_offset))
165: #define xph_align (size_t)((clazz == ELFCLASS32 \
166: ? (off_t) (ph32.p_align ? \
167: elf_getu32(swap, ph32.p_align) : 4) \
168: : (off_t) (ph64.p_align ? \
169: elf_getu64(swap, ph64.p_align) : 4)))
170: #define xph_filesz (size_t)((clazz == ELFCLASS32 \
171: ? elf_getu32(swap, ph32.p_filesz) \
172: : elf_getu64(swap, ph64.p_filesz)))
173: #define xnh_addr (clazz == ELFCLASS32 \
174: ? (void *) &nh32 \
175: : (void *) &nh64)
176: #define xph_memsz (size_t)((clazz == ELFCLASS32 \
177: ? elf_getu32(swap, ph32.p_memsz) \
178: : elf_getu64(swap, ph64.p_memsz)))
179: #define xnh_sizeof (clazz == ELFCLASS32 \
180: ? sizeof nh32 \
181: : sizeof nh64)
182: #define xnh_type (clazz == ELFCLASS32 \
183: ? elf_getu32(swap, nh32.n_type) \
184: : elf_getu32(swap, nh64.n_type))
185: #define xnh_namesz (clazz == ELFCLASS32 \
186: ? elf_getu32(swap, nh32.n_namesz) \
187: : elf_getu32(swap, nh64.n_namesz))
188: #define xnh_descsz (clazz == ELFCLASS32 \
189: ? elf_getu32(swap, nh32.n_descsz) \
190: : elf_getu32(swap, nh64.n_descsz))
191: #define prpsoffsets(i) (clazz == ELFCLASS32 \
192: ? prpsoffsets32[i] \
193: : prpsoffsets64[i])
194: #define xcap_addr (clazz == ELFCLASS32 \
195: ? (void *) &cap32 \
196: : (void *) &cap64)
197: #define xcap_sizeof (clazz == ELFCLASS32 \
198: ? sizeof cap32 \
199: : sizeof cap64)
200: #define xcap_tag (clazz == ELFCLASS32 \
201: ? elf_getu32(swap, cap32.c_tag) \
202: : elf_getu64(swap, cap64.c_tag))
203: #define xcap_val (clazz == ELFCLASS32 \
204: ? elf_getu32(swap, cap32.c_un.c_val) \
205: : elf_getu64(swap, cap64.c_un.c_val))
206:
207: #ifdef ELFCORE
208: /*
209: * Try larger offsets first to avoid false matches
210: * from earlier data that happen to look like strings.
211: */
212: static const size_t prpsoffsets32[] = {
213: #ifdef USE_NT_PSINFO
214: 104, /* SunOS 5.x (command line) */
215: 88, /* SunOS 5.x (short name) */
216: #endif /* USE_NT_PSINFO */
217:
218: 100, /* SunOS 5.x (command line) */
219: 84, /* SunOS 5.x (short name) */
220:
221: 44, /* Linux (command line) */
222: 28, /* Linux 2.0.36 (short name) */
223:
224: 8, /* FreeBSD */
225: };
226:
227: static const size_t prpsoffsets64[] = {
228: #ifdef USE_NT_PSINFO
229: 152, /* SunOS 5.x (command line) */
230: 136, /* SunOS 5.x (short name) */
231: #endif /* USE_NT_PSINFO */
232:
233: 136, /* SunOS 5.x, 64-bit (command line) */
234: 120, /* SunOS 5.x, 64-bit (short name) */
235:
236: 56, /* Linux (command line) */
237: 40, /* Linux (tested on core from 2.4.x, short name) */
238:
239: 16, /* FreeBSD, 64-bit */
240: };
241:
242: #define NOFFSETS32 (sizeof prpsoffsets32 / sizeof prpsoffsets32[0])
243: #define NOFFSETS64 (sizeof prpsoffsets64 / sizeof prpsoffsets64[0])
244:
245: #define NOFFSETS (clazz == ELFCLASS32 ? NOFFSETS32 : NOFFSETS64)
246:
247: /*
248: * Look through the program headers of an executable image, searching
249: * for a PT_NOTE section of type NT_PRPSINFO, with a name "CORE" or
250: * "FreeBSD"; if one is found, try looking in various places in its
251: * contents for a 16-character string containing only printable
252: * characters - if found, that string should be the name of the program
253: * that dropped core. Note: right after that 16-character string is,
254: * at least in SunOS 5.x (and possibly other SVR4-flavored systems) and
255: * Linux, a longer string (80 characters, in 5.x, probably other
256: * SVR4-flavored systems, and Linux) containing the start of the
257: * command line for that program.
258: *
259: * SunOS 5.x core files contain two PT_NOTE sections, with the types
260: * NT_PRPSINFO (old) and NT_PSINFO (new). These structs contain the
261: * same info about the command name and command line, so it probably
262: * isn't worthwhile to look for NT_PSINFO, but the offsets are provided
263: * above (see USE_NT_PSINFO), in case we ever decide to do so. The
264: * NT_PRPSINFO and NT_PSINFO sections are always in order and adjacent;
265: * the SunOS 5.x file command relies on this (and prefers the latter).
266: *
267: * The signal number probably appears in a section of type NT_PRSTATUS,
268: * but that's also rather OS-dependent, in ways that are harder to
269: * dissect with heuristics, so I'm not bothering with the signal number.
270: * (I suppose the signal number could be of interest in situations where
271: * you don't have the binary of the program that dropped core; if you
272: * *do* have that binary, the debugger will probably tell you what
273: * signal it was.)
274: */
275:
276: #define OS_STYLE_SVR4 0
277: #define OS_STYLE_FREEBSD 1
278: #define OS_STYLE_NETBSD 2
279:
280: private const char os_style_names[][8] = {
281: "SVR4",
282: "FreeBSD",
283: "NetBSD",
284: };
285:
286: #define FLAGS_DID_CORE 1
287: #define FLAGS_DID_NOTE 2
288: #define FLAGS_DID_CORE_STYLE 4
289:
290: private int
291: dophn_core(struct magic_set *ms, int clazz, int swap, int fd, off_t off,
292: int num, size_t size, off_t fsize, int *flags)
293: {
294: Elf32_Phdr ph32;
295: Elf64_Phdr ph64;
296: size_t offset;
297: unsigned char nbuf[BUFSIZ];
298: ssize_t bufsize;
299: off_t savedoffset;
300: struct stat st;
301:
302: if (fstat(fd, &st) < 0) {
303: file_badread(ms);
304: return -1;
305: }
306:
307: if (size != xph_sizeof) {
308: if (file_printf(ms, ", corrupted program header size") == -1)
309: return -1;
310: return 0;
311: }
312:
313: /*
314: * Loop through all the program headers.
315: */
316: for ( ; num; num--) {
317: if ((savedoffset = lseek(fd, off, SEEK_SET)) == (off_t)-1) {
318: file_badseek(ms);
319: return -1;
320: }
321: if (read(fd, xph_addr, xph_sizeof) == -1) {
322: file_badread(ms);
323: return -1;
324: }
325: if (xph_offset > fsize) {
326: if (lseek(fd, savedoffset, SEEK_SET) == (off_t)-1) {
327: file_badseek(ms);
328: return -1;
329: }
330: continue;
331: }
332:
333: off += size;
334: if (xph_type != PT_NOTE)
335: continue;
336:
337: /*
338: * This is a PT_NOTE section; loop through all the notes
339: * in the section.
340: */
341: if (lseek(fd, xph_offset, SEEK_SET) == (off_t)-1) {
342: file_badseek(ms);
343: return -1;
344: }
345: bufsize = read(fd, nbuf,
346: ((xph_filesz < sizeof(nbuf)) ? xph_filesz : sizeof(nbuf)));
347: if (bufsize == -1) {
348: file_badread(ms);
349: return -1;
350: }
351: offset = 0;
352: for (;;) {
353: if (offset >= (size_t)bufsize)
354: break;
355: offset = donote(ms, nbuf, offset, (size_t)bufsize,
356: clazz, swap, 4, flags);
357: if (offset == 0)
358: break;
359:
360: }
361: }
362: return 0;
363: }
364: #endif
365:
366: private size_t
367: donote(struct magic_set *ms, unsigned char *nbuf, size_t offset, size_t size,
368: int clazz, int swap, size_t align, int *flags)
369: {
370: Elf32_Nhdr nh32;
371: Elf64_Nhdr nh64;
372: size_t noff, doff;
373: #ifdef ELFCORE
374: int os_style = -1;
375: #endif
376: uint32_t namesz, descsz;
377:
378: (void)memcpy(xnh_addr, &nbuf[offset], xnh_sizeof);
379: offset += xnh_sizeof;
380:
381: namesz = xnh_namesz;
382: descsz = xnh_descsz;
383: if ((namesz == 0) && (descsz == 0)) {
384: /*
385: * We're out of note headers.
386: */
387: return (offset >= size) ? offset : size;
388: }
389:
390: if (namesz & 0x80000000) {
391: (void)file_printf(ms, ", bad note name size 0x%lx",
392: (unsigned long)namesz);
393: return offset;
394: }
395:
396: if (descsz & 0x80000000) {
397: (void)file_printf(ms, ", bad note description size 0x%lx",
398: (unsigned long)descsz);
399: return offset;
400: }
401:
402:
403: noff = offset;
404: doff = ELF_ALIGN(offset + namesz);
405:
406: if (offset + namesz > size) {
407: /*
408: * We're past the end of the buffer.
409: */
410: return doff;
411: }
412:
413: offset = ELF_ALIGN(doff + descsz);
414: if (doff + descsz > size) {
415: /*
416: * We're past the end of the buffer.
417: */
418: return (offset >= size) ? offset : size;
419: }
420:
421: if (*flags & FLAGS_DID_NOTE)
422: goto core;
423:
424: if (namesz == 4 && strcmp((char *)&nbuf[noff], "GNU") == 0 &&
425: xnh_type == NT_GNU_VERSION && descsz == 16) {
426: uint32_t desc[4];
427: (void)memcpy(desc, &nbuf[doff], sizeof(desc));
428:
429: if (file_printf(ms, ", for GNU/") == -1)
430: return size;
431: switch (elf_getu32(swap, desc[0])) {
432: case GNU_OS_LINUX:
433: if (file_printf(ms, "Linux") == -1)
434: return size;
435: break;
436: case GNU_OS_HURD:
437: if (file_printf(ms, "Hurd") == -1)
438: return size;
439: break;
440: case GNU_OS_SOLARIS:
441: if (file_printf(ms, "Solaris") == -1)
442: return size;
443: break;
444: case GNU_OS_KFREEBSD:
445: if (file_printf(ms, "kFreeBSD") == -1)
446: return size;
447: break;
448: case GNU_OS_KNETBSD:
449: if (file_printf(ms, "kNetBSD") == -1)
450: return size;
451: break;
452: default:
453: if (file_printf(ms, "<unknown>") == -1)
454: return size;
455: }
456: if (file_printf(ms, " %d.%d.%d", elf_getu32(swap, desc[1]),
457: elf_getu32(swap, desc[2]), elf_getu32(swap, desc[3])) == -1)
458: return size;
459: *flags |= FLAGS_DID_NOTE;
460: return size;
461: }
462:
463: if (namesz == 7 && strcmp((char *)&nbuf[noff], "NetBSD") == 0 &&
464: xnh_type == NT_NETBSD_VERSION && descsz == 4) {
465: uint32_t desc;
466: (void)memcpy(&desc, &nbuf[doff], sizeof(desc));
467: desc = elf_getu32(swap, desc);
468:
469: if (file_printf(ms, ", for NetBSD") == -1)
470: return size;
471: /*
472: * The version number used to be stuck as 199905, and was thus
473: * basically content-free. Newer versions of NetBSD have fixed
474: * this and now use the encoding of __NetBSD_Version__:
475: *
476: * MMmmrrpp00
477: *
478: * M = major version
479: * m = minor version
480: * r = release ["",A-Z,Z[A-Z] but numeric]
481: * p = patchlevel
482: */
483: if (desc > 100000000U) {
484: uint32_t ver_patch = (desc / 100) % 100;
485: uint32_t ver_rel = (desc / 10000) % 100;
486: uint32_t ver_min = (desc / 1000000) % 100;
487: uint32_t ver_maj = desc / 100000000;
488:
489: if (file_printf(ms, " %u.%u", ver_maj, ver_min) == -1)
490: return size;
491: if (ver_rel == 0 && ver_patch != 0) {
492: if (file_printf(ms, ".%u", ver_patch) == -1)
493: return size;
494: } else if (ver_rel != 0) {
495: while (ver_rel > 26) {
496: if (file_printf(ms, "Z") == -1)
497: return size;
498: ver_rel -= 26;
499: }
500: if (file_printf(ms, "%c", 'A' + ver_rel - 1)
501: == -1)
502: return size;
503: }
504: }
505: *flags |= FLAGS_DID_NOTE;
506: return size;
507: }
508:
509: if (namesz == 8 && strcmp((char *)&nbuf[noff], "FreeBSD") == 0 &&
510: xnh_type == NT_FREEBSD_VERSION && descsz == 4) {
511: uint32_t desc;
512: (void)memcpy(&desc, &nbuf[doff], sizeof(desc));
513: desc = elf_getu32(swap, desc);
514: if (file_printf(ms, ", for FreeBSD") == -1)
515: return size;
516:
517: /*
518: * Contents is __FreeBSD_version, whose relation to OS
519: * versions is defined by a huge table in the Porter's
520: * Handbook. This is the general scheme:
521: *
522: * Releases:
523: * Mmp000 (before 4.10)
524: * Mmi0p0 (before 5.0)
525: * Mmm0p0
526: *
527: * Development branches:
528: * Mmpxxx (before 4.6)
529: * Mmp1xx (before 4.10)
530: * Mmi1xx (before 5.0)
531: * M000xx (pre-M.0)
532: * Mmm1xx
533: *
534: * M = major version
535: * m = minor version
536: * i = minor version increment (491000 -> 4.10)
537: * p = patchlevel
538: * x = revision
539: *
540: * The first release of FreeBSD to use ELF by default
541: * was version 3.0.
542: */
543: if (desc == 460002) {
544: if (file_printf(ms, " 4.6.2") == -1)
545: return size;
546: } else if (desc < 460100) {
547: if (file_printf(ms, " %d.%d", desc / 100000,
548: desc / 10000 % 10) == -1)
549: return size;
550: if (desc / 1000 % 10 > 0)
551: if (file_printf(ms, ".%d", desc / 1000 % 10)
552: == -1)
553: return size;
554: if ((desc % 1000 > 0) || (desc % 100000 == 0))
555: if (file_printf(ms, " (%d)", desc) == -1)
556: return size;
557: } else if (desc < 500000) {
558: if (file_printf(ms, " %d.%d", desc / 100000,
559: desc / 10000 % 10 + desc / 1000 % 10) == -1)
560: return size;
561: if (desc / 100 % 10 > 0) {
562: if (file_printf(ms, " (%d)", desc) == -1)
563: return size;
564: } else if (desc / 10 % 10 > 0) {
565: if (file_printf(ms, ".%d", desc / 10 % 10)
566: == -1)
567: return size;
568: }
569: } else {
570: if (file_printf(ms, " %d.%d", desc / 100000,
571: desc / 1000 % 100) == -1)
572: return size;
573: if ((desc / 100 % 10 > 0) ||
574: (desc % 100000 / 100 == 0)) {
575: if (file_printf(ms, " (%d)", desc) == -1)
576: return size;
577: } else if (desc / 10 % 10 > 0) {
578: if (file_printf(ms, ".%d", desc / 10 % 10)
579: == -1)
580: return size;
581: }
582: }
583: *flags |= FLAGS_DID_NOTE;
584: return size;
585: }
586:
587: if (namesz == 8 && strcmp((char *)&nbuf[noff], "OpenBSD") == 0 &&
588: xnh_type == NT_OPENBSD_VERSION && descsz == 4) {
589: if (file_printf(ms, ", for OpenBSD") == -1)
590: return size;
591: /* Content of note is always 0 */
592: *flags |= FLAGS_DID_NOTE;
593: return size;
594: }
595:
596: if (namesz == 10 && strcmp((char *)&nbuf[noff], "DragonFly") == 0 &&
597: xnh_type == NT_DRAGONFLY_VERSION && descsz == 4) {
598: uint32_t desc;
599: if (file_printf(ms, ", for DragonFly") == -1)
600: return size;
601: (void)memcpy(&desc, &nbuf[doff], sizeof(desc));
602: desc = elf_getu32(swap, desc);
603: if (file_printf(ms, " %d.%d.%d", desc / 100000,
604: desc / 10000 % 10, desc % 10000) == -1)
605: return size;
606: *flags |= FLAGS_DID_NOTE;
607: return size;
608: }
609:
610: core:
611: /*
612: * Sigh. The 2.0.36 kernel in Debian 2.1, at
613: * least, doesn't correctly implement name
614: * sections, in core dumps, as specified by
615: * the "Program Linking" section of "UNIX(R) System
616: * V Release 4 Programmer's Guide: ANSI C and
617: * Programming Support Tools", because my copy
618: * clearly says "The first 'namesz' bytes in 'name'
619: * contain a *null-terminated* [emphasis mine]
620: * character representation of the entry's owner
621: * or originator", but the 2.0.36 kernel code
622: * doesn't include the terminating null in the
623: * name....
624: */
625: if ((namesz == 4 && strncmp((char *)&nbuf[noff], "CORE", 4) == 0) ||
626: (namesz == 5 && strcmp((char *)&nbuf[noff], "CORE") == 0)) {
627: os_style = OS_STYLE_SVR4;
628: }
629:
630: if ((namesz == 8 && strcmp((char *)&nbuf[noff], "FreeBSD") == 0)) {
631: os_style = OS_STYLE_FREEBSD;
632: }
633:
634: if ((namesz >= 11 && strncmp((char *)&nbuf[noff], "NetBSD-CORE", 11)
635: == 0)) {
636: os_style = OS_STYLE_NETBSD;
637: }
638:
639: #ifdef ELFCORE
640: if ((*flags & FLAGS_DID_CORE) != 0)
641: return size;
642:
643: if (os_style != -1 && (*flags & FLAGS_DID_CORE_STYLE) == 0) {
644: if (file_printf(ms, ", %s-style", os_style_names[os_style])
645: == -1)
646: return size;
647: *flags |= FLAGS_DID_CORE_STYLE;
648: }
649:
650: switch (os_style) {
651: case OS_STYLE_NETBSD:
652: if (xnh_type == NT_NETBSD_CORE_PROCINFO) {
653: uint32_t signo;
654: /*
655: * Extract the program name. It is at
656: * offset 0x7c, and is up to 32-bytes,
657: * including the terminating NUL.
658: */
659: if (file_printf(ms, ", from '%.31s'",
660: &nbuf[doff + 0x7c]) == -1)
661: return size;
662:
663: /*
664: * Extract the signal number. It is at
665: * offset 0x08.
666: */
667: (void)memcpy(&signo, &nbuf[doff + 0x08],
668: sizeof(signo));
669: if (file_printf(ms, " (signal %u)",
670: elf_getu32(swap, signo)) == -1)
671: return size;
672: *flags |= FLAGS_DID_CORE;
673: return size;
674: }
675: break;
676:
677: default:
678: if (xnh_type == NT_PRPSINFO) {
679: size_t i, j;
680: unsigned char c;
681: /*
682: * Extract the program name. We assume
683: * it to be 16 characters (that's what it
684: * is in SunOS 5.x and Linux).
685: *
686: * Unfortunately, it's at a different offset
687: * in various OSes, so try multiple offsets.
688: * If the characters aren't all printable,
689: * reject it.
690: */
691: for (i = 0; i < NOFFSETS; i++) {
692: unsigned char *cname, *cp;
693: size_t reloffset = prpsoffsets(i);
694: size_t noffset = doff + reloffset;
695: for (j = 0; j < 16; j++, noffset++,
696: reloffset++) {
697: /*
698: * Make sure we're not past
699: * the end of the buffer; if
700: * we are, just give up.
701: */
702: if (noffset >= size)
703: goto tryanother;
704:
705: /*
706: * Make sure we're not past
707: * the end of the contents;
708: * if we are, this obviously
709: * isn't the right offset.
710: */
711: if (reloffset >= descsz)
712: goto tryanother;
713:
714: c = nbuf[noffset];
715: if (c == '\0') {
716: /*
717: * A '\0' at the
718: * beginning is
719: * obviously wrong.
720: * Any other '\0'
721: * means we're done.
722: */
723: if (j == 0)
724: goto tryanother;
725: else
726: break;
727: } else {
728: /*
729: * A nonprintable
730: * character is also
731: * wrong.
732: */
733: if (!isprint(c) || isquote(c))
734: goto tryanother;
735: }
736: }
737: /*
738: * Well, that worked.
739: */
740: cname = (unsigned char *)
741: &nbuf[doff + prpsoffsets(i)];
742: for (cp = cname; *cp && isprint(*cp); cp++)
743: continue;
744: /*
745: * Linux apparently appends a space at the end
746: * of the command line: remove it.
747: */
748: while (cp > cname && isspace(cp[-1]))
749: cp--;
750: if (file_printf(ms, ", from '%.*s'",
751: (int)(cp - cname), cname) == -1)
752: return size;
753: *flags |= FLAGS_DID_CORE;
754: return size;
755:
756: tryanother:
757: ;
758: }
759: }
760: break;
761: }
762: #endif
763: return offset;
764: }
765:
766: /* SunOS 5.x hardware capability descriptions */
767: typedef struct cap_desc {
768: uint64_t cd_mask;
769: const char *cd_name;
770: } cap_desc_t;
771:
772: static const cap_desc_t cap_desc_sparc[] = {
773: { AV_SPARC_MUL32, "MUL32" },
774: { AV_SPARC_DIV32, "DIV32" },
775: { AV_SPARC_FSMULD, "FSMULD" },
776: { AV_SPARC_V8PLUS, "V8PLUS" },
777: { AV_SPARC_POPC, "POPC" },
778: { AV_SPARC_VIS, "VIS" },
779: { AV_SPARC_VIS2, "VIS2" },
780: { AV_SPARC_ASI_BLK_INIT, "ASI_BLK_INIT" },
781: { AV_SPARC_FMAF, "FMAF" },
782: { AV_SPARC_FJFMAU, "FJFMAU" },
783: { AV_SPARC_IMA, "IMA" },
784: { 0, NULL }
785: };
786:
787: static const cap_desc_t cap_desc_386[] = {
788: { AV_386_FPU, "FPU" },
789: { AV_386_TSC, "TSC" },
790: { AV_386_CX8, "CX8" },
791: { AV_386_SEP, "SEP" },
792: { AV_386_AMD_SYSC, "AMD_SYSC" },
793: { AV_386_CMOV, "CMOV" },
794: { AV_386_MMX, "MMX" },
795: { AV_386_AMD_MMX, "AMD_MMX" },
796: { AV_386_AMD_3DNow, "AMD_3DNow" },
797: { AV_386_AMD_3DNowx, "AMD_3DNowx" },
798: { AV_386_FXSR, "FXSR" },
799: { AV_386_SSE, "SSE" },
800: { AV_386_SSE2, "SSE2" },
801: { AV_386_PAUSE, "PAUSE" },
802: { AV_386_SSE3, "SSE3" },
803: { AV_386_MON, "MON" },
804: { AV_386_CX16, "CX16" },
805: { AV_386_AHF, "AHF" },
806: { AV_386_TSCP, "TSCP" },
807: { AV_386_AMD_SSE4A, "AMD_SSE4A" },
808: { AV_386_POPCNT, "POPCNT" },
809: { AV_386_AMD_LZCNT, "AMD_LZCNT" },
810: { AV_386_SSSE3, "SSSE3" },
811: { AV_386_SSE4_1, "SSE4.1" },
812: { AV_386_SSE4_2, "SSE4.2" },
813: { 0, NULL }
814: };
815:
816: private int
817: doshn(struct magic_set *ms, int clazz, int swap, int fd, off_t off, int num,
818: size_t size, int *flags, int mach)
819: {
820: Elf32_Shdr sh32;
821: Elf64_Shdr sh64;
822: int stripped = 1;
823: void *nbuf;
824: off_t noff;
825: uint64_t cap_hw1 = 0; /* SunOS 5.x hardware capabilites */
826: uint64_t cap_sf1 = 0; /* SunOS 5.x software capabilites */
827:
828: if (size != xsh_sizeof) {
829: if (file_printf(ms, ", corrupted section header size") == -1)
830: return -1;
831: return 0;
832: }
833:
834: if (lseek(fd, off, SEEK_SET) == (off_t)-1) {
835: file_badseek(ms);
836: return -1;
837: }
838:
839: for ( ; num; num--) {
840: if (read(fd, xsh_addr, xsh_sizeof) == -1) {
841: file_badread(ms);
842: return -1;
843: }
844: switch (xsh_type) {
845: case SHT_SYMTAB:
846: #if 0
847: case SHT_DYNSYM:
848: #endif
849: stripped = 0;
850: break;
851: case SHT_NOTE:
852: if ((off = lseek(fd, (off_t)0, SEEK_CUR)) ==
853: (off_t)-1) {
854: file_badread(ms);
855: return -1;
856: }
857: nbuf = emalloc((size_t)xsh_size);
858: if ((noff = lseek(fd, (off_t)xsh_offset, SEEK_SET)) ==
859: (off_t)-1) {
860: file_badread(ms);
861: efree(nbuf);
862: return -1;
863: }
864: if (read(fd, nbuf, (size_t)xsh_size) !=
865: (ssize_t)xsh_size) {
866: efree(nbuf);
867: file_badread(ms);
868: return -1;
869: }
870:
871: noff = 0;
872: for (;;) {
873: if (noff >= (off_t)xsh_size)
874: break;
875: noff = donote(ms, nbuf, (size_t)noff,
876: (size_t)xsh_size, clazz, swap, 4,
877: flags);
878: if (noff == 0)
879: break;
880: }
881: if ((lseek(fd, off, SEEK_SET)) == (off_t)-1) {
882: efree(nbuf);
883: file_badread(ms);
884: return -1;
885: }
886: efree(nbuf);
887: break;
888: case SHT_SUNW_cap:
889: {
890: off_t coff;
891: if ((off = lseek(fd, (off_t)0, SEEK_CUR)) ==
892: (off_t)-1) {
893: file_badread(ms);
894: return -1;
895: }
896: if (lseek(fd, (off_t)xsh_offset, SEEK_SET) ==
897: (off_t)-1) {
898: file_badread(ms);
899: return -1;
900: }
901: coff = 0;
902: for (;;) {
903: Elf32_Cap cap32;
904: Elf64_Cap cap64;
905: char cbuf[/*CONSTCOND*/
906: MAX(sizeof cap32, sizeof cap64)];
907: if ((coff += xcap_sizeof) >= (off_t)xsh_size)
908: break;
909: if (read(fd, cbuf, (size_t)xcap_sizeof) !=
910: (ssize_t)xcap_sizeof) {
911: file_badread(ms);
912: return -1;
913: }
914: (void)memcpy(xcap_addr, cbuf, xcap_sizeof);
915: switch (xcap_tag) {
916: case CA_SUNW_NULL:
917: break;
918: case CA_SUNW_HW_1:
919: cap_hw1 |= xcap_val;
920: break;
921: case CA_SUNW_SF_1:
922: cap_sf1 |= xcap_val;
923: break;
924: default:
925: if (file_printf(ms,
926: ", with unknown capability "
927: "0x%llx = 0x%llx",
928: (unsigned long long)xcap_tag,
929: (unsigned long long)xcap_val) == -1)
930: return -1;
931: break;
932: }
933: }
934: if (lseek(fd, off, SEEK_SET) == (off_t)-1) {
935: file_badread(ms);
936: return -1;
937: }
938: break;
939: }
940: }
941: }
942: if (file_printf(ms, ", %sstripped", stripped ? "" : "not ") == -1)
943: return -1;
944: if (cap_hw1) {
945: const cap_desc_t *cdp;
946: switch (mach) {
947: case EM_SPARC:
948: case EM_SPARC32PLUS:
949: case EM_SPARCV9:
950: cdp = cap_desc_sparc;
951: break;
952: case EM_386:
953: case EM_IA_64:
954: case EM_AMD64:
955: cdp = cap_desc_386;
956: break;
957: default:
958: cdp = NULL;
959: break;
960: }
961: if (file_printf(ms, ", uses") == -1)
962: return -1;
963: if (cdp) {
964: while (cdp->cd_name) {
965: if (cap_hw1 & cdp->cd_mask) {
966: if (file_printf(ms,
967: " %s", cdp->cd_name) == -1)
968: return -1;
969: cap_hw1 &= ~cdp->cd_mask;
970: }
971: ++cdp;
972: }
973: if (cap_hw1)
974: if (file_printf(ms,
975: " unknown hardware capability 0x%llx",
976: (unsigned long long)cap_hw1) == -1)
977: return -1;
978: } else {
979: if (file_printf(ms,
980: " hardware capability 0x%llx",
981: (unsigned long long)cap_hw1) == -1)
982: return -1;
983: }
984: }
985: if (cap_sf1) {
986: if (cap_sf1 & SF1_SUNW_FPUSED) {
987: if (file_printf(ms,
988: (cap_sf1 & SF1_SUNW_FPKNWN)
989: ? ", uses frame pointer"
990: : ", not known to use frame pointer") == -1)
991: return -1;
992: }
993: cap_sf1 &= ~SF1_SUNW_MASK;
994: if (cap_sf1)
995: if (file_printf(ms,
996: ", with unknown software capability 0x%llx",
997: (unsigned long long)cap_sf1) == -1)
998: return -1;
999: }
1000: return 0;
1001: }
1002:
1003: /*
1004: * Look through the program headers of an executable image, searching
1005: * for a PT_INTERP section; if one is found, it's dynamically linked,
1006: * otherwise it's statically linked.
1007: */
1008: private int
1009: dophn_exec(struct magic_set *ms, int clazz, int swap, int fd, off_t off,
1010: int num, size_t size, off_t fsize, int *flags, int sh_num)
1011: {
1012: Elf32_Phdr ph32;
1013: Elf64_Phdr ph64;
1014: const char *linking_style = "statically";
1015: const char *shared_libraries = "";
1016: unsigned char nbuf[BUFSIZ];
1017: int bufsize;
1018: size_t offset, align;
1019: off_t savedoffset = (off_t)-1;
1020: struct stat st;
1021:
1022: if (fstat(fd, &st) < 0) {
1023: file_badread(ms);
1024: return -1;
1025: }
1026:
1027: if (size != xph_sizeof) {
1028: if (file_printf(ms, ", corrupted program header size") == -1)
1029: return -1;
1030: return 0;
1031: }
1032:
1033: if (lseek(fd, off, SEEK_SET) == (off_t)-1) {
1034: file_badseek(ms);
1035: return -1;
1036: }
1037:
1038: for ( ; num; num--) {
1039: if (read(fd, xph_addr, xph_sizeof) == -1) {
1040: file_badread(ms);
1041: return -1;
1042: }
1043: if (xph_offset > st.st_size && savedoffset != (off_t)-1) {
1044: if (lseek(fd, savedoffset, SEEK_SET) == (off_t)-1) {
1045: file_badseek(ms);
1046: return -1;
1047: }
1048: continue;
1049: }
1050:
1051: if ((savedoffset = lseek(fd, (off_t)0, SEEK_CUR)) == (off_t)-1) {
1052: file_badseek(ms);
1053: return -1;
1054: }
1055:
1056: if (xph_offset > fsize) {
1057: if (lseek(fd, savedoffset, SEEK_SET) == (off_t)-1) {
1058: file_badseek(ms);
1059: return -1;
1060: }
1061: continue;
1062: }
1063:
1064: switch (xph_type) {
1065: case PT_DYNAMIC:
1066: linking_style = "dynamically";
1067: break;
1068: case PT_INTERP:
1069: shared_libraries = " (uses shared libs)";
1070: break;
1071: case PT_NOTE:
1072: if ((align = xph_align) & 0x80000000) {
1073: if (file_printf(ms,
1074: ", invalid note alignment 0x%lx",
1075: (unsigned long)align) == -1)
1076: return -1;
1077: align = 4;
1078: }
1079: if (sh_num)
1080: break;
1081: /*
1082: * This is a PT_NOTE section; loop through all the notes
1083: * in the section.
1084: */
1085: if (lseek(fd, xph_offset, SEEK_SET)
1086: == (off_t)-1) {
1087: file_badseek(ms);
1088: return -1;
1089: }
1090: bufsize = read(fd, nbuf, ((xph_filesz < sizeof(nbuf)) ?
1091: xph_filesz : sizeof(nbuf)));
1092: if (bufsize == -1) {
1093: file_badread(ms);
1094: return -1;
1095: }
1096: offset = 0;
1097: for (;;) {
1098: if (offset >= (size_t)bufsize)
1099: break;
1100: offset = donote(ms, nbuf, offset,
1101: (size_t)bufsize, clazz, swap, align,
1102: flags);
1103: if (offset == 0)
1104: break;
1105: }
1106: if (lseek(fd, savedoffset, SEEK_SET) == (off_t)-1) {
1107: file_badseek(ms);
1108: return -1;
1109: }
1110: break;
1111: default:
1112: break;
1113: }
1114: }
1115: if (file_printf(ms, ", %s linked%s", linking_style, shared_libraries)
1116: == -1)
1117: return -1;
1118: return 0;
1119: }
1120:
1121:
1122: protected int
1123: file_tryelf(struct magic_set *ms, int fd, const unsigned char *buf,
1124: size_t nbytes)
1125: {
1126: union {
1127: int32_t l;
1128: char c[sizeof (int32_t)];
1129: } u;
1130: int clazz;
1131: int swap;
1132: struct stat st;
1133: off_t fsize;
1134: int flags = 0;
1135: Elf32_Ehdr elf32hdr;
1136: Elf64_Ehdr elf64hdr;
1137: uint16_t type;
1138:
1139: if (ms->flags & (MAGIC_MIME|MAGIC_APPLE))
1140: return 0;
1141: /*
1142: * ELF executables have multiple section headers in arbitrary
1143: * file locations and thus file(1) cannot determine it from easily.
1144: * Instead we traverse thru all section headers until a symbol table
1145: * one is found or else the binary is stripped.
1146: * Return immediately if it's not ELF (so we avoid pipe2file unless needed).
1147: */
1148: if (buf[EI_MAG0] != ELFMAG0
1149: || (buf[EI_MAG1] != ELFMAG1 && buf[EI_MAG1] != OLFMAG1)
1150: || buf[EI_MAG2] != ELFMAG2 || buf[EI_MAG3] != ELFMAG3)
1151: return 0;
1152:
1153: /*
1154: * If we cannot seek, it must be a pipe, socket or fifo.
1155: */
1156: if((lseek(fd, (off_t)0, SEEK_SET) == (off_t)-1) && (errno == ESPIPE))
1157: fd = file_pipe2file(ms, fd, buf, nbytes);
1158:
1159: if (fstat(fd, &st) == -1) {
1160: file_badread(ms);
1161: return -1;
1162: }
1163: fsize = st.st_size;
1164:
1165: clazz = buf[EI_CLASS];
1166:
1167: switch (clazz) {
1168: case ELFCLASS32:
1169: #undef elf_getu
1170: #define elf_getu(a, b) elf_getu32(a, b)
1171: #undef elfhdr
1172: #define elfhdr elf32hdr
1173: #include "elfclass.h"
1174: case ELFCLASS64:
1175: #undef elf_getu
1176: #define elf_getu(a, b) elf_getu64(a, b)
1177: #undef elfhdr
1178: #define elfhdr elf64hdr
1179: #include "elfclass.h"
1180: default:
1181: if (file_printf(ms, ", unknown class %d", clazz) == -1)
1182: return -1;
1183: break;
1184: }
1185: return 0;
1186: }
1187: #endif