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1.11 ! deraadt 1: /* $OpenBSD: readelf.c,v 1.10 2009/04/24 18:54:34 chl Exp $ */
1.5 ian 2: /*
1.8 tedu 3: * Copyright (c) Christos Zoulas 2003.
4: * All Rights Reserved.
1.5 ian 5: *
6: * Redistribution and use in source and binary forms, with or without
7: * modification, are permitted provided that the following conditions
8: * are met:
9: * 1. Redistributions of source code must retain the above copyright
10: * notice immediately at the beginning of the file, without modification,
11: * this list of conditions, and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
15: *
16: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
20: * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26: * SUCH DAMAGE.
27: */
1.4 ian 28: #include "file.h"
1.1 millert 29:
30: #ifdef BUILTIN_ELF
31: #include <string.h>
32: #include <ctype.h>
33: #include <stdlib.h>
1.4 ian 34: #ifdef HAVE_UNISTD_H
1.1 millert 35: #include <unistd.h>
1.4 ian 36: #endif
1.1 millert 37:
38: #include "readelf.h"
1.10 chl 39: #include "magic.h"
1.4 ian 40:
41: #ifdef ELFCORE
1.9 chl 42: private int dophn_core(struct magic_set *, int, int, int, off_t, int, size_t,
43: off_t, int *);
1.4 ian 44: #endif
1.9 chl 45: private int dophn_exec(struct magic_set *, int, int, int, off_t, int, size_t,
46: off_t, int *);
47: private int doshn(struct magic_set *, int, int, int, off_t, int, size_t, int *);
1.8 tedu 48: private size_t donote(struct magic_set *, unsigned char *, size_t, size_t, int,
1.9 chl 49: int, size_t, int *);
1.8 tedu 50:
51: #define ELF_ALIGN(a) ((((a) + align - 1) / align) * align)
52:
1.9 chl 53: #define isquote(c) (strchr("'\"`", (c)) != NULL)
54:
1.8 tedu 55: private uint16_t getu16(int, uint16_t);
56: private uint32_t getu32(int, uint32_t);
57: private uint64_t getu64(int, uint64_t);
1.4 ian 58:
1.8 tedu 59: private uint16_t
1.4 ian 60: getu16(int swap, uint16_t value)
61: {
62: union {
63: uint16_t ui;
64: char c[2];
65: } retval, tmpval;
66:
67: if (swap) {
68: tmpval.ui = value;
69:
70: retval.c[0] = tmpval.c[1];
71: retval.c[1] = tmpval.c[0];
72:
73: return retval.ui;
74: } else
75: return value;
76: }
77:
1.8 tedu 78: private uint32_t
1.4 ian 79: getu32(int swap, uint32_t value)
80: {
81: union {
82: uint32_t ui;
83: char c[4];
84: } retval, tmpval;
85:
86: if (swap) {
87: tmpval.ui = value;
88:
89: retval.c[0] = tmpval.c[3];
90: retval.c[1] = tmpval.c[2];
91: retval.c[2] = tmpval.c[1];
92: retval.c[3] = tmpval.c[0];
93:
94: return retval.ui;
95: } else
96: return value;
97: }
98:
1.8 tedu 99: private uint64_t
1.4 ian 100: getu64(int swap, uint64_t value)
101: {
102: union {
103: uint64_t ui;
104: char c[8];
105: } retval, tmpval;
106:
107: if (swap) {
108: tmpval.ui = value;
109:
110: retval.c[0] = tmpval.c[7];
111: retval.c[1] = tmpval.c[6];
112: retval.c[2] = tmpval.c[5];
113: retval.c[3] = tmpval.c[4];
114: retval.c[4] = tmpval.c[3];
115: retval.c[5] = tmpval.c[2];
116: retval.c[6] = tmpval.c[1];
117: retval.c[7] = tmpval.c[0];
118:
119: return retval.ui;
120: } else
121: return value;
122: }
123:
1.10 chl 124: #define elf_getu16(swap, value) getu16(swap, value)
125: #define elf_getu32(swap, value) getu32(swap, value)
1.9 chl 126: #ifdef USE_ARRAY_FOR_64BIT_TYPES
127: # define elf_getu64(swap, array) \
1.10 chl 128: ((swap ? ((uint64_t)elf_getu32(swap, array[0])) << 32 : elf_getu32(swap, array[0])) + \
129: (swap ? elf_getu32(swap, array[1]) : ((uint64_t)elf_getu32(swap, array[1]) << 32)))
1.9 chl 130: #else
131: # define elf_getu64(swap, value) getu64(swap, value)
132: #endif
133:
1.10 chl 134: #define xsh_addr (class == ELFCLASS32 \
135: ? (void *) &sh32 \
1.4 ian 136: : (void *) &sh64)
1.10 chl 137: #define xsh_sizeof (class == ELFCLASS32 \
138: ? sizeof sh32 \
1.4 ian 139: : sizeof sh64)
1.10 chl 140: #define xsh_size (class == ELFCLASS32 \
141: ? elf_getu32(swap, sh32.sh_size) \
142: : elf_getu64(swap, sh64.sh_size))
143: #define xsh_offset (class == ELFCLASS32 \
144: ? elf_getu32(swap, sh32.sh_offset) \
145: : elf_getu64(swap, sh64.sh_offset))
146: #define xsh_type (class == ELFCLASS32 \
147: ? elf_getu32(swap, sh32.sh_type) \
148: : elf_getu32(swap, sh64.sh_type))
149: #define xph_addr (class == ELFCLASS32 \
150: ? (void *) &ph32 \
1.4 ian 151: : (void *) &ph64)
1.10 chl 152: #define xph_sizeof (class == ELFCLASS32 \
153: ? sizeof ph32 \
1.4 ian 154: : sizeof ph64)
1.10 chl 155: #define xph_type (class == ELFCLASS32 \
156: ? elf_getu32(swap, ph32.p_type) \
157: : elf_getu32(swap, ph64.p_type))
158: #define xph_offset (off_t)(class == ELFCLASS32 \
159: ? elf_getu32(swap, ph32.p_offset) \
160: : elf_getu64(swap, ph64.p_offset))
161: #define xph_align (size_t)((class == ELFCLASS32 \
162: ? (off_t) (ph32.p_align ? \
163: elf_getu32(swap, ph32.p_align) : 4) \
164: : (off_t) (ph64.p_align ? \
165: elf_getu64(swap, ph64.p_align) : 4)))
166: #define xph_filesz (size_t)((class == ELFCLASS32 \
167: ? elf_getu32(swap, ph32.p_filesz) \
168: : elf_getu64(swap, ph64.p_filesz)))
169: #define xnh_addr (class == ELFCLASS32 \
170: ? (void *) &nh32 \
1.9 chl 171: : (void *) &nh64)
1.10 chl 172: #define xph_memsz (size_t)((class == ELFCLASS32 \
173: ? elf_getu32(swap, ph32.p_memsz) \
174: : elf_getu64(swap, ph64.p_memsz)))
175: #define xnh_sizeof (class == ELFCLASS32 \
176: ? sizeof nh32 \
1.8 tedu 177: : sizeof nh64)
1.10 chl 178: #define xnh_type (class == ELFCLASS32 \
179: ? elf_getu32(swap, nh32.n_type) \
180: : elf_getu32(swap, nh64.n_type))
181: #define xnh_namesz (class == ELFCLASS32 \
182: ? elf_getu32(swap, nh32.n_namesz) \
183: : elf_getu32(swap, nh64.n_namesz))
184: #define xnh_descsz (class == ELFCLASS32 \
185: ? elf_getu32(swap, nh32.n_descsz) \
186: : elf_getu32(swap, nh64.n_descsz))
187: #define prpsoffsets(i) (class == ELFCLASS32 \
188: ? prpsoffsets32[i] \
1.4 ian 189: : prpsoffsets64[i])
1.1 millert 190:
1.4 ian 191: #ifdef ELFCORE
1.10 chl 192: /*
193: * Try larger offsets first to avoid false matches
194: * from earlier data that happen to look like strings.
195: */
196: static const size_t prpsoffsets32[] = {
197: #ifdef USE_NT_PSINFO
198: 104, /* SunOS 5.x (command line) */
199: 88, /* SunOS 5.x (short name) */
200: #endif /* USE_NT_PSINFO */
201:
202: 100, /* SunOS 5.x (command line) */
203: 84, /* SunOS 5.x (short name) */
204:
205: 44, /* Linux (command line) */
206: 28, /* Linux 2.0.36 (short name) */
207:
1.4 ian 208: 8, /* FreeBSD */
209: };
210:
1.10 chl 211: static const size_t prpsoffsets64[] = {
212: #ifdef USE_NT_PSINFO
213: 152, /* SunOS 5.x (command line) */
214: 136, /* SunOS 5.x (short name) */
215: #endif /* USE_NT_PSINFO */
216:
217: 136, /* SunOS 5.x, 64-bit (command line) */
218: 120, /* SunOS 5.x, 64-bit (short name) */
219:
220: 56, /* Linux (command line) */
221: 40, /* Linux (tested on core from 2.4.x, short name) */
222:
1.9 chl 223: 16, /* FreeBSD, 64-bit */
1.1 millert 224: };
225:
1.4 ian 226: #define NOFFSETS32 (sizeof prpsoffsets32 / sizeof prpsoffsets32[0])
227: #define NOFFSETS64 (sizeof prpsoffsets64 / sizeof prpsoffsets64[0])
228:
229: #define NOFFSETS (class == ELFCLASS32 ? NOFFSETS32 : NOFFSETS64)
1.1 millert 230:
231: /*
232: * Look through the program headers of an executable image, searching
1.4 ian 233: * for a PT_NOTE section of type NT_PRPSINFO, with a name "CORE" or
234: * "FreeBSD"; if one is found, try looking in various places in its
235: * contents for a 16-character string containing only printable
236: * characters - if found, that string should be the name of the program
237: * that dropped core. Note: right after that 16-character string is,
238: * at least in SunOS 5.x (and possibly other SVR4-flavored systems) and
239: * Linux, a longer string (80 characters, in 5.x, probably other
240: * SVR4-flavored systems, and Linux) containing the start of the
241: * command line for that program.
242: *
1.10 chl 243: * SunOS 5.x core files contain two PT_NOTE sections, with the types
244: * NT_PRPSINFO (old) and NT_PSINFO (new). These structs contain the
245: * same info about the command name and command line, so it probably
246: * isn't worthwhile to look for NT_PSINFO, but the offsets are provided
247: * above (see USE_NT_PSINFO), in case we ever decide to do so. The
248: * NT_PRPSINFO and NT_PSINFO sections are always in order and adjacent;
249: * the SunOS 5.x file command relies on this (and prefers the latter).
250: *
1.4 ian 251: * The signal number probably appears in a section of type NT_PRSTATUS,
252: * but that's also rather OS-dependent, in ways that are harder to
253: * dissect with heuristics, so I'm not bothering with the signal number.
254: * (I suppose the signal number could be of interest in situations where
255: * you don't have the binary of the program that dropped core; if you
256: * *do* have that binary, the debugger will probably tell you what
257: * signal it was.)
1.1 millert 258: */
1.4 ian 259:
260: #define OS_STYLE_SVR4 0
261: #define OS_STYLE_FREEBSD 1
262: #define OS_STYLE_NETBSD 2
263:
1.10 chl 264: private const char os_style_names[][8] = {
1.4 ian 265: "SVR4",
266: "FreeBSD",
267: "NetBSD",
268: };
269:
1.9 chl 270: #define FLAGS_DID_CORE 1
271: #define FLAGS_DID_NOTE 2
1.10 chl 272: #define FLAGS_DID_CORE_STYLE 4
1.9 chl 273:
1.8 tedu 274: private int
275: dophn_core(struct magic_set *ms, int class, int swap, int fd, off_t off,
1.9 chl 276: int num, size_t size, off_t fsize, int *flags)
1.1 millert 277: {
1.4 ian 278: Elf32_Phdr ph32;
279: Elf64_Phdr ph64;
1.8 tedu 280: size_t offset;
281: unsigned char nbuf[BUFSIZ];
282: ssize_t bufsize;
1.9 chl 283: off_t savedoffset;
284: struct stat st;
1.8 tedu 285:
1.9 chl 286: if (fstat(fd, &st) < 0) {
287: file_badread(ms);
288: return -1;
289: }
290:
291: if (size != xph_sizeof) {
1.8 tedu 292: if (file_printf(ms, ", corrupted program header size") == -1)
293: return -1;
294: return 0;
295: }
1.9 chl 296:
1.4 ian 297: /*
298: * Loop through all the program headers.
299: */
1.1 millert 300: for ( ; num; num--) {
1.9 chl 301: if ((savedoffset = lseek(fd, off, SEEK_SET)) == (off_t)-1) {
1.8 tedu 302: file_badseek(ms);
303: return -1;
304: }
1.9 chl 305: if (read(fd, xph_addr, xph_sizeof) == -1) {
1.8 tedu 306: file_badread(ms);
307: return -1;
308: }
1.9 chl 309: if (xph_offset > fsize) {
310: if (lseek(fd, savedoffset, SEEK_SET) == (off_t)-1) {
311: file_badseek(ms);
312: return -1;
313: }
314: continue;
315: }
316:
1.1 millert 317: off += size;
1.9 chl 318: if (xph_type != PT_NOTE)
1.1 millert 319: continue;
1.4 ian 320:
321: /*
322: * This is a PT_NOTE section; loop through all the notes
323: * in the section.
324: */
1.9 chl 325: if (lseek(fd, xph_offset, SEEK_SET) == (off_t)-1) {
1.8 tedu 326: file_badseek(ms);
327: return -1;
328: }
1.9 chl 329: bufsize = read(fd, nbuf,
330: ((xph_filesz < sizeof(nbuf)) ? xph_filesz : sizeof(nbuf)));
1.8 tedu 331: if (bufsize == -1) {
332: file_badread(ms);
333: return -1;
334: }
1.1 millert 335: offset = 0;
336: for (;;) {
1.8 tedu 337: if (offset >= (size_t)bufsize)
338: break;
339: offset = donote(ms, nbuf, offset, (size_t)bufsize,
1.9 chl 340: class, swap, 4, flags);
1.8 tedu 341: if (offset == 0)
1.1 millert 342: break;
343:
1.8 tedu 344: }
345: }
346: return 0;
347: }
348: #endif
349:
350: private size_t
351: donote(struct magic_set *ms, unsigned char *nbuf, size_t offset, size_t size,
1.9 chl 352: int class, int swap, size_t align, int *flags)
1.8 tedu 353: {
354: Elf32_Nhdr nh32;
355: Elf64_Nhdr nh64;
356: size_t noff, doff;
357: #ifdef ELFCORE
358: int os_style = -1;
359: #endif
360: uint32_t namesz, descsz;
361:
1.9 chl 362: (void)memcpy(xnh_addr, &nbuf[offset], xnh_sizeof);
363: offset += xnh_sizeof;
1.8 tedu 364:
1.9 chl 365: namesz = xnh_namesz;
366: descsz = xnh_descsz;
1.8 tedu 367: if ((namesz == 0) && (descsz == 0)) {
368: /*
369: * We're out of note headers.
370: */
1.9 chl 371: return (offset >= size) ? offset : size;
1.8 tedu 372: }
373:
374: if (namesz & 0x80000000) {
375: (void)file_printf(ms, ", bad note name size 0x%lx",
376: (unsigned long)namesz);
377: return offset;
378: }
379:
380: if (descsz & 0x80000000) {
381: (void)file_printf(ms, ", bad note description size 0x%lx",
382: (unsigned long)descsz);
383: return offset;
384: }
385:
386:
387: noff = offset;
388: doff = ELF_ALIGN(offset + namesz);
389:
1.9 chl 390: if (offset + namesz > size) {
1.8 tedu 391: /*
392: * We're past the end of the buffer.
393: */
394: return doff;
395: }
396:
397: offset = ELF_ALIGN(doff + descsz);
1.9 chl 398: if (doff + descsz > size) {
399: /*
400: * We're past the end of the buffer.
401: */
402: return (offset >= size) ? offset : size;
1.8 tedu 403: }
404:
1.9 chl 405: if (*flags & FLAGS_DID_NOTE)
406: goto core;
407:
1.8 tedu 408: if (namesz == 4 && strcmp((char *)&nbuf[noff], "GNU") == 0 &&
1.9 chl 409: xnh_type == NT_GNU_VERSION && descsz == 16) {
1.8 tedu 410: uint32_t desc[4];
411: (void)memcpy(desc, &nbuf[doff], sizeof(desc));
412:
413: if (file_printf(ms, ", for GNU/") == -1)
414: return size;
1.10 chl 415: switch (elf_getu32(swap, desc[0])) {
1.8 tedu 416: case GNU_OS_LINUX:
417: if (file_printf(ms, "Linux") == -1)
418: return size;
419: break;
420: case GNU_OS_HURD:
421: if (file_printf(ms, "Hurd") == -1)
422: return size;
423: break;
424: case GNU_OS_SOLARIS:
425: if (file_printf(ms, "Solaris") == -1)
426: return size;
427: break;
1.10 chl 428: case GNU_OS_KFREEBSD:
429: if (file_printf(ms, "kFreeBSD") == -1)
430: return size;
431: break;
432: case GNU_OS_KNETBSD:
433: if (file_printf(ms, "kNetBSD") == -1)
434: return size;
435: break;
1.8 tedu 436: default:
437: if (file_printf(ms, "<unknown>") == -1)
438: return size;
439: }
1.10 chl 440: if (file_printf(ms, " %d.%d.%d", elf_getu32(swap, desc[1]),
441: elf_getu32(swap, desc[2]), elf_getu32(swap, desc[3])) == -1)
1.8 tedu 442: return size;
1.9 chl 443: *flags |= FLAGS_DID_NOTE;
1.8 tedu 444: return size;
445: }
446:
447: if (namesz == 7 && strcmp((char *)&nbuf[noff], "NetBSD") == 0 &&
1.9 chl 448: xnh_type == NT_NETBSD_VERSION && descsz == 4) {
1.8 tedu 449: uint32_t desc;
450: (void)memcpy(&desc, &nbuf[doff], sizeof(desc));
1.10 chl 451: desc = elf_getu32(swap, desc);
1.8 tedu 452:
453: if (file_printf(ms, ", for NetBSD") == -1)
454: return size;
455: /*
456: * The version number used to be stuck as 199905, and was thus
457: * basically content-free. Newer versions of NetBSD have fixed
458: * this and now use the encoding of __NetBSD_Version__:
459: *
460: * MMmmrrpp00
461: *
462: * M = major version
463: * m = minor version
464: * r = release ["",A-Z,Z[A-Z] but numeric]
465: * p = patchlevel
466: */
467: if (desc > 100000000U) {
1.9 chl 468: uint32_t ver_patch = (desc / 100) % 100;
469: uint32_t ver_rel = (desc / 10000) % 100;
470: uint32_t ver_min = (desc / 1000000) % 100;
471: uint32_t ver_maj = desc / 100000000;
1.8 tedu 472:
473: if (file_printf(ms, " %u.%u", ver_maj, ver_min) == -1)
474: return size;
475: if (ver_rel == 0 && ver_patch != 0) {
476: if (file_printf(ms, ".%u", ver_patch) == -1)
477: return size;
478: } else if (ver_rel != 0) {
479: while (ver_rel > 26) {
1.9 chl 480: if (file_printf(ms, "Z") == -1)
481: return size;
1.8 tedu 482: ver_rel -= 26;
483: }
1.9 chl 484: if (file_printf(ms, "%c", 'A' + ver_rel - 1)
485: == -1)
486: return size;
1.1 millert 487: }
1.8 tedu 488: }
1.9 chl 489: *flags |= FLAGS_DID_NOTE;
1.8 tedu 490: return size;
491: }
1.4 ian 492:
1.8 tedu 493: if (namesz == 8 && strcmp((char *)&nbuf[noff], "FreeBSD") == 0 &&
1.9 chl 494: xnh_type == NT_FREEBSD_VERSION && descsz == 4) {
1.8 tedu 495: uint32_t desc;
496: (void)memcpy(&desc, &nbuf[doff], sizeof(desc));
1.10 chl 497: desc = elf_getu32(swap, desc);
1.8 tedu 498: if (file_printf(ms, ", for FreeBSD") == -1)
499: return size;
1.1 millert 500:
1.8 tedu 501: /*
502: * Contents is __FreeBSD_version, whose relation to OS
1.9 chl 503: * versions is defined by a huge table in the Porter's
504: * Handbook. This is the general scheme:
505: *
506: * Releases:
507: * Mmp000 (before 4.10)
508: * Mmi0p0 (before 5.0)
509: * Mmm0p0
510: *
511: * Development branches:
512: * Mmpxxx (before 4.6)
513: * Mmp1xx (before 4.10)
514: * Mmi1xx (before 5.0)
515: * M000xx (pre-M.0)
516: * Mmm1xx
517: *
518: * M = major version
519: * m = minor version
520: * i = minor version increment (491000 -> 4.10)
521: * p = patchlevel
522: * x = revision
523: *
524: * The first release of FreeBSD to use ELF by default
525: * was version 3.0.
1.8 tedu 526: */
1.9 chl 527: if (desc == 460002) {
528: if (file_printf(ms, " 4.6.2") == -1)
529: return size;
530: } else if (desc < 460100) {
1.8 tedu 531: if (file_printf(ms, " %d.%d", desc / 100000,
532: desc / 10000 % 10) == -1)
533: return size;
534: if (desc / 1000 % 10 > 0)
535: if (file_printf(ms, ".%d", desc / 1000 % 10)
536: == -1)
537: return size;
1.9 chl 538: if ((desc % 1000 > 0) || (desc % 100000 == 0))
539: if (file_printf(ms, " (%d)", desc) == -1)
540: return size;
541: } else if (desc < 500000) {
542: if (file_printf(ms, " %d.%d", desc / 100000,
543: desc / 10000 % 10 + desc / 1000 % 10) == -1)
544: return size;
545: if (desc / 100 % 10 > 0) {
546: if (file_printf(ms, " (%d)", desc) == -1)
547: return size;
548: } else if (desc / 10 % 10 > 0) {
549: if (file_printf(ms, ".%d", desc / 10 % 10)
550: == -1)
551: return size;
552: }
1.8 tedu 553: } else {
554: if (file_printf(ms, " %d.%d", desc / 100000,
555: desc / 1000 % 100) == -1)
556: return size;
1.9 chl 557: if ((desc / 100 % 10 > 0) ||
558: (desc % 100000 / 100 == 0)) {
559: if (file_printf(ms, " (%d)", desc) == -1)
1.8 tedu 560: return size;
1.9 chl 561: } else if (desc / 10 % 10 > 0) {
562: if (file_printf(ms, ".%d", desc / 10 % 10)
563: == -1)
1.8 tedu 564: return size;
1.4 ian 565: }
1.8 tedu 566: }
1.9 chl 567: *flags |= FLAGS_DID_NOTE;
1.8 tedu 568: return size;
569: }
570:
571: if (namesz == 8 && strcmp((char *)&nbuf[noff], "OpenBSD") == 0 &&
1.9 chl 572: xnh_type == NT_OPENBSD_VERSION && descsz == 4) {
1.8 tedu 573: if (file_printf(ms, ", for OpenBSD") == -1)
574: return size;
575: /* Content of note is always 0 */
1.9 chl 576: *flags |= FLAGS_DID_NOTE;
1.8 tedu 577: return size;
578: }
579:
1.9 chl 580: if (namesz == 10 && strcmp((char *)&nbuf[noff], "DragonFly") == 0 &&
581: xnh_type == NT_DRAGONFLY_VERSION && descsz == 4) {
582: uint32_t desc;
583: if (file_printf(ms, ", for DragonFly") == -1)
584: return size;
585: (void)memcpy(&desc, &nbuf[doff], sizeof(desc));
1.10 chl 586: desc = elf_getu32(swap, desc);
1.9 chl 587: if (file_printf(ms, " %d.%d.%d", desc / 100000,
588: desc / 10000 % 10, desc % 10000) == -1)
589: return size;
590: *flags |= FLAGS_DID_NOTE;
591: return size;
592: }
593:
594: core:
1.8 tedu 595: /*
596: * Sigh. The 2.0.36 kernel in Debian 2.1, at
597: * least, doesn't correctly implement name
598: * sections, in core dumps, as specified by
599: * the "Program Linking" section of "UNIX(R) System
600: * V Release 4 Programmer's Guide: ANSI C and
601: * Programming Support Tools", because my copy
602: * clearly says "The first 'namesz' bytes in 'name'
603: * contain a *null-terminated* [emphasis mine]
604: * character representation of the entry's owner
605: * or originator", but the 2.0.36 kernel code
606: * doesn't include the terminating null in the
607: * name....
608: */
609: if ((namesz == 4 && strncmp((char *)&nbuf[noff], "CORE", 4) == 0) ||
610: (namesz == 5 && strcmp((char *)&nbuf[noff], "CORE") == 0)) {
611: os_style = OS_STYLE_SVR4;
612: }
613:
614: if ((namesz == 8 && strcmp((char *)&nbuf[noff], "FreeBSD") == 0)) {
615: os_style = OS_STYLE_FREEBSD;
616: }
617:
618: if ((namesz >= 11 && strncmp((char *)&nbuf[noff], "NetBSD-CORE", 11)
619: == 0)) {
620: os_style = OS_STYLE_NETBSD;
621: }
1.4 ian 622:
1.8 tedu 623: #ifdef ELFCORE
1.9 chl 624: if ((*flags & FLAGS_DID_CORE) != 0)
625: return size;
626:
1.10 chl 627: if (os_style != -1 && (*flags & FLAGS_DID_CORE_STYLE) == 0) {
1.9 chl 628: if (file_printf(ms, ", %s-style", os_style_names[os_style])
629: == -1)
1.8 tedu 630: return size;
1.10 chl 631: *flags |= FLAGS_DID_CORE_STYLE;
1.9 chl 632: }
1.4 ian 633:
1.9 chl 634: switch (os_style) {
635: case OS_STYLE_NETBSD:
636: if (xnh_type == NT_NETBSD_CORE_PROCINFO) {
637: uint32_t signo;
638: /*
639: * Extract the program name. It is at
640: * offset 0x7c, and is up to 32-bytes,
641: * including the terminating NUL.
642: */
643: if (file_printf(ms, ", from '%.31s'",
644: &nbuf[doff + 0x7c]) == -1)
645: return size;
646:
647: /*
648: * Extract the signal number. It is at
649: * offset 0x08.
650: */
651: (void)memcpy(&signo, &nbuf[doff + 0x08],
652: sizeof(signo));
653: if (file_printf(ms, " (signal %u)",
1.10 chl 654: elf_getu32(swap, signo)) == -1)
1.9 chl 655: return size;
1.10 chl 656: *flags |= FLAGS_DID_CORE;
1.8 tedu 657: return size;
1.9 chl 658: }
659: break;
1.8 tedu 660:
1.9 chl 661: default:
662: if (xnh_type == NT_PRPSINFO) {
663: size_t i, j;
664: unsigned char c;
665: /*
666: * Extract the program name. We assume
667: * it to be 16 characters (that's what it
668: * is in SunOS 5.x and Linux).
669: *
670: * Unfortunately, it's at a different offset
671: * in various OSes, so try multiple offsets.
672: * If the characters aren't all printable,
673: * reject it.
674: */
675: for (i = 0; i < NOFFSETS; i++) {
1.10 chl 676: unsigned char *cname, *cp;
1.9 chl 677: size_t reloffset = prpsoffsets(i);
678: size_t noffset = doff + reloffset;
679: for (j = 0; j < 16; j++, noffset++,
680: reloffset++) {
1.8 tedu 681: /*
1.9 chl 682: * Make sure we're not past
683: * the end of the buffer; if
684: * we are, just give up.
1.8 tedu 685: */
1.9 chl 686: if (noffset >= size)
1.8 tedu 687: goto tryanother;
1.9 chl 688:
1.1 millert 689: /*
1.9 chl 690: * Make sure we're not past
691: * the end of the contents;
692: * if we are, this obviously
693: * isn't the right offset.
1.1 millert 694: */
1.9 chl 695: if (reloffset >= descsz)
1.8 tedu 696: goto tryanother;
1.9 chl 697:
698: c = nbuf[noffset];
699: if (c == '\0') {
700: /*
701: * A '\0' at the
702: * beginning is
703: * obviously wrong.
704: * Any other '\0'
705: * means we're done.
706: */
707: if (j == 0)
708: goto tryanother;
709: else
710: break;
711: } else {
712: /*
713: * A nonprintable
714: * character is also
715: * wrong.
716: */
717: if (!isprint(c) || isquote(c))
718: goto tryanother;
719: }
1.8 tedu 720: }
1.9 chl 721: /*
722: * Well, that worked.
723: */
1.10 chl 724: cname = (unsigned char *)
725: &nbuf[doff + prpsoffsets(i)];
726: for (cp = cname; *cp && isprint(*cp); cp++)
727: continue;
728: /*
729: * Linux apparently appends a space at the end
730: * of the command line: remove it.
731: */
732: while (cp > cname && isspace(cp[-1]))
733: cp--;
734: if (file_printf(ms, ", from '%.*s'",
735: (int)(cp - cname), cname) == -1)
1.9 chl 736: return size;
1.10 chl 737: *flags |= FLAGS_DID_CORE;
1.8 tedu 738: return size;
739:
1.9 chl 740: tryanother:
741: ;
742: }
1.8 tedu 743: }
1.9 chl 744: break;
1.8 tedu 745: }
746: #endif
747: return offset;
748: }
749:
750: private int
751: doshn(struct magic_set *ms, int class, int swap, int fd, off_t off, int num,
1.9 chl 752: size_t size, int *flags)
1.8 tedu 753: {
754: Elf32_Shdr sh32;
755: Elf64_Shdr sh64;
1.9 chl 756: int stripped = 1;
757: void *nbuf;
758: off_t noff;
1.8 tedu 759:
1.9 chl 760: if (size != xsh_sizeof) {
1.8 tedu 761: if (file_printf(ms, ", corrupted section header size") == -1)
762: return -1;
763: return 0;
764: }
765:
766: if (lseek(fd, off, SEEK_SET) == (off_t)-1) {
767: file_badseek(ms);
768: return -1;
769: }
770:
771: for ( ; num; num--) {
1.9 chl 772: if (read(fd, xsh_addr, xsh_sizeof) == -1) {
1.8 tedu 773: file_badread(ms);
774: return -1;
775: }
1.9 chl 776: switch (xsh_type) {
777: case SHT_SYMTAB:
778: #if 0
779: case SHT_DYNSYM:
780: #endif
781: stripped = 0;
782: break;
783: case SHT_NOTE:
784: if ((off = lseek(fd, (off_t)0, SEEK_CUR)) ==
785: (off_t)-1) {
786: file_badread(ms);
787: return -1;
788: }
789: if ((nbuf = malloc((size_t)xsh_size)) == NULL) {
790: file_error(ms, errno, "Cannot allocate memory"
791: " for note");
792: return -1;
793: }
794: if ((noff = lseek(fd, (off_t)xsh_offset, SEEK_SET)) ==
795: (off_t)-1) {
796: file_badread(ms);
797: free(nbuf);
798: return -1;
799: }
800: if (read(fd, nbuf, (size_t)xsh_size) !=
801: (ssize_t)xsh_size) {
802: free(nbuf);
803: file_badread(ms);
804: return -1;
805: }
806:
807: noff = 0;
808: for (;;) {
809: if (noff >= (size_t)xsh_size)
810: break;
811: noff = donote(ms, nbuf, (size_t)noff,
812: (size_t)xsh_size, class, swap, 4,
813: flags);
814: if (noff == 0)
815: break;
816: }
817: if ((lseek(fd, off, SEEK_SET)) == (off_t)-1) {
818: free(nbuf);
819: file_badread(ms);
1.8 tedu 820: return -1;
1.9 chl 821: }
822: free(nbuf);
823: break;
1.8 tedu 824: }
825: }
1.9 chl 826: if (file_printf(ms, ", %sstripped", stripped ? "" : "not ") == -1)
1.8 tedu 827: return -1;
828: return 0;
829: }
830:
831: /*
832: * Look through the program headers of an executable image, searching
833: * for a PT_INTERP section; if one is found, it's dynamically linked,
834: * otherwise it's statically linked.
835: */
836: private int
837: dophn_exec(struct magic_set *ms, int class, int swap, int fd, off_t off,
1.9 chl 838: int num, size_t size, off_t fsize, int *flags)
1.8 tedu 839: {
840: Elf32_Phdr ph32;
841: Elf64_Phdr ph64;
842: const char *linking_style = "statically";
843: const char *shared_libraries = "";
844: unsigned char nbuf[BUFSIZ];
845: int bufsize;
846: size_t offset, align;
1.9 chl 847: off_t savedoffset = (off_t)-1;
848: struct stat st;
1.8 tedu 849:
1.9 chl 850: if (fstat(fd, &st) < 0) {
851: file_badread(ms);
852: return -1;
853: }
854:
855: if (size != xph_sizeof) {
1.8 tedu 856: if (file_printf(ms, ", corrupted program header size") == -1)
1.10 chl 857: return -1;
1.8 tedu 858: return 0;
859: }
1.9 chl 860:
1.8 tedu 861: if (lseek(fd, off, SEEK_SET) == (off_t)-1) {
862: file_badseek(ms);
863: return -1;
864: }
865:
866: for ( ; num; num--) {
1.9 chl 867: if (read(fd, xph_addr, xph_sizeof) == -1) {
1.8 tedu 868: file_badread(ms);
869: return -1;
870: }
1.9 chl 871: if (xph_offset > st.st_size && savedoffset != (off_t)-1) {
872: if (lseek(fd, savedoffset, SEEK_SET) == (off_t)-1) {
873: file_badseek(ms);
874: return -1;
875: }
876: continue;
877: }
878:
1.8 tedu 879: if ((savedoffset = lseek(fd, (off_t)0, SEEK_CUR)) == (off_t)-1) {
880: file_badseek(ms);
881: return -1;
882: }
883:
1.9 chl 884: if (xph_offset > fsize) {
885: if (lseek(fd, savedoffset, SEEK_SET) == (off_t)-1) {
886: file_badseek(ms);
887: return -1;
888: }
889: continue;
890: }
891:
892: switch (xph_type) {
1.8 tedu 893: case PT_DYNAMIC:
894: linking_style = "dynamically";
895: break;
896: case PT_INTERP:
897: shared_libraries = " (uses shared libs)";
898: break;
899: case PT_NOTE:
1.9 chl 900: if ((align = xph_align) & 0x80000000) {
1.8 tedu 901: if (file_printf(ms,
902: ", invalid note alignment 0x%lx",
903: (unsigned long)align) == -1)
904: return -1;
905: align = 4;
906: }
907: /*
908: * This is a PT_NOTE section; loop through all the notes
909: * in the section.
910: */
1.9 chl 911: if (lseek(fd, xph_offset, SEEK_SET)
1.8 tedu 912: == (off_t)-1) {
913: file_badseek(ms);
914: return -1;
915: }
1.9 chl 916: bufsize = read(fd, nbuf, ((xph_filesz < sizeof(nbuf)) ?
917: xph_filesz : sizeof(nbuf)));
1.8 tedu 918: if (bufsize == -1) {
919: file_badread(ms);
920: return -1;
921: }
922: offset = 0;
923: for (;;) {
924: if (offset >= (size_t)bufsize)
925: break;
926: offset = donote(ms, nbuf, offset,
1.9 chl 927: (size_t)bufsize, class, swap, align,
928: flags);
1.8 tedu 929: if (offset == 0)
1.4 ian 930: break;
1.1 millert 931: }
1.9 chl 932: if (lseek(fd, savedoffset, SEEK_SET) == (off_t)-1) {
1.8 tedu 933: file_badseek(ms);
934: return -1;
935: }
936: break;
1.10 chl 937: default:
938: break;
1.1 millert 939: }
940: }
1.8 tedu 941: if (file_printf(ms, ", %s linked%s", linking_style, shared_libraries)
942: == -1)
943: return -1;
944: return 0;
1.1 millert 945: }
946:
1.8 tedu 947:
948: protected int
949: file_tryelf(struct magic_set *ms, int fd, const unsigned char *buf,
950: size_t nbytes)
1.1 millert 951: {
952: union {
1.3 itojun 953: int32_t l;
954: char c[sizeof (int32_t)];
1.1 millert 955: } u;
1.4 ian 956: int class;
957: int swap;
1.9 chl 958: struct stat st;
959: off_t fsize;
960: int flags = 0;
1.10 chl 961: Elf32_Ehdr elf32hdr;
962: Elf64_Ehdr elf64hdr;
963: uint16_t type;
964:
965: if (ms->flags & MAGIC_MIME)
966: return 0;
967: /*
968: * ELF executables have multiple section headers in arbitrary
969: * file locations and thus file(1) cannot determine it from easily.
970: * Instead we traverse thru all section headers until a symbol table
971: * one is found or else the binary is stripped.
972: * Return immediately if it's not ELF (so we avoid pipe2file unless needed).
973: */
974: if (buf[EI_MAG0] != ELFMAG0
975: || (buf[EI_MAG1] != ELFMAG1 && buf[EI_MAG1] != OLFMAG1)
976: || buf[EI_MAG2] != ELFMAG2 || buf[EI_MAG3] != ELFMAG3)
977: return 0;
1.4 ian 978:
979: /*
1.8 tedu 980: * If we cannot seek, it must be a pipe, socket or fifo.
1.4 ian 981: */
982: if((lseek(fd, (off_t)0, SEEK_SET) == (off_t)-1) && (errno == ESPIPE))
1.8 tedu 983: fd = file_pipe2file(ms, fd, buf, nbytes);
1.1 millert 984:
1.9 chl 985: if (fstat(fd, &st) == -1) {
986: file_badread(ms);
987: return -1;
988: }
989: fsize = st.st_size;
990:
991: class = buf[EI_CLASS];
1.4 ian 992:
1.10 chl 993: switch (class) {
994: case ELFCLASS32:
995: #undef elf_getu
996: #define elf_getu(a, b) elf_getu32(a, b)
997: #undef elfhdr
998: #define elfhdr elf32hdr
999: #include "elfclass.h"
1000: case ELFCLASS64:
1001: #undef elf_getu
1002: #define elf_getu(a, b) elf_getu64(a, b)
1003: #undef elfhdr
1004: #define elfhdr elf64hdr
1005: #include "elfclass.h"
1006: default:
1007: if (file_printf(ms, ", unknown class %d", class) == -1)
1008: return -1;
1009: break;
1.1 millert 1010: }
1.8 tedu 1011: return 0;
1.1 millert 1012: }
1013: #endif