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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
1.1.1.3 ! misho 30: FILE_RCSID("@(#)$File: readelf.c,v 1.97 2013/03/06 03:35:30 christos Exp $")
1.1 misho 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);
1.1.1.2 misho 50: private int doshn(struct magic_set *, int, int, int, off_t, int, size_t,
51: off_t, int *, int);
1.1 misho 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 \
1.1.1.3 ! misho 142: ? sizeof(sh32) \
! 143: : sizeof(sh64))
! 144: #define xsh_size (size_t)(clazz == ELFCLASS32 \
1.1 misho 145: ? elf_getu32(swap, sh32.sh_size) \
146: : elf_getu64(swap, sh64.sh_size))
1.1.1.2 misho 147: #define xsh_offset (off_t)(clazz == ELFCLASS32 \
1.1 misho 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))
1.1.1.3 ! misho 153: #define xsh_name (clazz == ELFCLASS32 \
! 154: ? elf_getu32(swap, sh32.sh_name) \
! 155: : elf_getu32(swap, sh64.sh_name))
1.1 misho 156: #define xph_addr (clazz == ELFCLASS32 \
157: ? (void *) &ph32 \
158: : (void *) &ph64)
159: #define xph_sizeof (clazz == ELFCLASS32 \
1.1.1.3 ! misho 160: ? sizeof(ph32) \
! 161: : sizeof(ph64))
1.1 misho 162: #define xph_type (clazz == ELFCLASS32 \
163: ? elf_getu32(swap, ph32.p_type) \
164: : elf_getu32(swap, ph64.p_type))
165: #define xph_offset (off_t)(clazz == ELFCLASS32 \
166: ? elf_getu32(swap, ph32.p_offset) \
167: : elf_getu64(swap, ph64.p_offset))
168: #define xph_align (size_t)((clazz == ELFCLASS32 \
169: ? (off_t) (ph32.p_align ? \
170: elf_getu32(swap, ph32.p_align) : 4) \
171: : (off_t) (ph64.p_align ? \
172: elf_getu64(swap, ph64.p_align) : 4)))
173: #define xph_filesz (size_t)((clazz == ELFCLASS32 \
174: ? elf_getu32(swap, ph32.p_filesz) \
175: : elf_getu64(swap, ph64.p_filesz)))
176: #define xnh_addr (clazz == ELFCLASS32 \
177: ? (void *) &nh32 \
178: : (void *) &nh64)
179: #define xph_memsz (size_t)((clazz == ELFCLASS32 \
180: ? elf_getu32(swap, ph32.p_memsz) \
181: : elf_getu64(swap, ph64.p_memsz)))
182: #define xnh_sizeof (clazz == ELFCLASS32 \
183: ? sizeof nh32 \
184: : sizeof nh64)
185: #define xnh_type (clazz == ELFCLASS32 \
186: ? elf_getu32(swap, nh32.n_type) \
187: : elf_getu32(swap, nh64.n_type))
188: #define xnh_namesz (clazz == ELFCLASS32 \
189: ? elf_getu32(swap, nh32.n_namesz) \
190: : elf_getu32(swap, nh64.n_namesz))
191: #define xnh_descsz (clazz == ELFCLASS32 \
192: ? elf_getu32(swap, nh32.n_descsz) \
193: : elf_getu32(swap, nh64.n_descsz))
194: #define prpsoffsets(i) (clazz == ELFCLASS32 \
195: ? prpsoffsets32[i] \
196: : prpsoffsets64[i])
197: #define xcap_addr (clazz == ELFCLASS32 \
198: ? (void *) &cap32 \
199: : (void *) &cap64)
200: #define xcap_sizeof (clazz == ELFCLASS32 \
201: ? sizeof cap32 \
202: : sizeof cap64)
203: #define xcap_tag (clazz == ELFCLASS32 \
204: ? elf_getu32(swap, cap32.c_tag) \
205: : elf_getu64(swap, cap64.c_tag))
206: #define xcap_val (clazz == ELFCLASS32 \
207: ? elf_getu32(swap, cap32.c_un.c_val) \
208: : elf_getu64(swap, cap64.c_un.c_val))
209:
210: #ifdef ELFCORE
211: /*
212: * Try larger offsets first to avoid false matches
213: * from earlier data that happen to look like strings.
214: */
215: static const size_t prpsoffsets32[] = {
216: #ifdef USE_NT_PSINFO
217: 104, /* SunOS 5.x (command line) */
218: 88, /* SunOS 5.x (short name) */
219: #endif /* USE_NT_PSINFO */
220:
221: 100, /* SunOS 5.x (command line) */
222: 84, /* SunOS 5.x (short name) */
223:
224: 44, /* Linux (command line) */
225: 28, /* Linux 2.0.36 (short name) */
226:
227: 8, /* FreeBSD */
228: };
229:
230: static const size_t prpsoffsets64[] = {
231: #ifdef USE_NT_PSINFO
232: 152, /* SunOS 5.x (command line) */
233: 136, /* SunOS 5.x (short name) */
234: #endif /* USE_NT_PSINFO */
235:
236: 136, /* SunOS 5.x, 64-bit (command line) */
237: 120, /* SunOS 5.x, 64-bit (short name) */
238:
239: 56, /* Linux (command line) */
240: 40, /* Linux (tested on core from 2.4.x, short name) */
241:
242: 16, /* FreeBSD, 64-bit */
243: };
244:
245: #define NOFFSETS32 (sizeof prpsoffsets32 / sizeof prpsoffsets32[0])
246: #define NOFFSETS64 (sizeof prpsoffsets64 / sizeof prpsoffsets64[0])
247:
248: #define NOFFSETS (clazz == ELFCLASS32 ? NOFFSETS32 : NOFFSETS64)
249:
250: /*
251: * Look through the program headers of an executable image, searching
252: * for a PT_NOTE section of type NT_PRPSINFO, with a name "CORE" or
253: * "FreeBSD"; if one is found, try looking in various places in its
254: * contents for a 16-character string containing only printable
255: * characters - if found, that string should be the name of the program
256: * that dropped core. Note: right after that 16-character string is,
257: * at least in SunOS 5.x (and possibly other SVR4-flavored systems) and
258: * Linux, a longer string (80 characters, in 5.x, probably other
259: * SVR4-flavored systems, and Linux) containing the start of the
260: * command line for that program.
261: *
262: * SunOS 5.x core files contain two PT_NOTE sections, with the types
263: * NT_PRPSINFO (old) and NT_PSINFO (new). These structs contain the
264: * same info about the command name and command line, so it probably
265: * isn't worthwhile to look for NT_PSINFO, but the offsets are provided
266: * above (see USE_NT_PSINFO), in case we ever decide to do so. The
267: * NT_PRPSINFO and NT_PSINFO sections are always in order and adjacent;
268: * the SunOS 5.x file command relies on this (and prefers the latter).
269: *
270: * The signal number probably appears in a section of type NT_PRSTATUS,
271: * but that's also rather OS-dependent, in ways that are harder to
272: * dissect with heuristics, so I'm not bothering with the signal number.
273: * (I suppose the signal number could be of interest in situations where
274: * you don't have the binary of the program that dropped core; if you
275: * *do* have that binary, the debugger will probably tell you what
276: * signal it was.)
277: */
278:
279: #define OS_STYLE_SVR4 0
280: #define OS_STYLE_FREEBSD 1
281: #define OS_STYLE_NETBSD 2
282:
283: private const char os_style_names[][8] = {
284: "SVR4",
285: "FreeBSD",
286: "NetBSD",
287: };
288:
1.1.1.2 misho 289: #define FLAGS_DID_CORE 0x01
290: #define FLAGS_DID_NOTE 0x02
291: #define FLAGS_DID_BUILD_ID 0x04
292: #define FLAGS_DID_CORE_STYLE 0x08
293: #define FLAGS_IS_CORE 0x10
1.1 misho 294:
295: private int
296: dophn_core(struct magic_set *ms, int clazz, int swap, int fd, off_t off,
297: int num, size_t size, off_t fsize, int *flags)
298: {
299: Elf32_Phdr ph32;
300: Elf64_Phdr ph64;
301: size_t offset;
302: unsigned char nbuf[BUFSIZ];
303: ssize_t bufsize;
304:
305: if (size != xph_sizeof) {
306: if (file_printf(ms, ", corrupted program header size") == -1)
307: return -1;
308: return 0;
309: }
310:
311: /*
312: * Loop through all the program headers.
313: */
314: for ( ; num; num--) {
1.1.1.2 misho 315: if (FINFO_LSEEK_FUNC(fd, off, SEEK_SET) == (off_t)-1) {
1.1 misho 316: file_badseek(ms);
317: return -1;
318: }
1.1.1.2 misho 319: if (FINFO_READ_FUNC(fd, xph_addr, xph_sizeof) == -1) {
1.1 misho 320: file_badread(ms);
321: return -1;
322: }
1.1.1.2 misho 323: off += size;
324:
1.1 misho 325: if (xph_offset > fsize) {
1.1.1.2 misho 326: /* Perhaps warn here */
1.1 misho 327: continue;
328: }
329:
330: if (xph_type != PT_NOTE)
331: continue;
332:
333: /*
334: * This is a PT_NOTE section; loop through all the notes
335: * in the section.
336: */
1.1.1.2 misho 337: if (FINFO_LSEEK_FUNC(fd, xph_offset, SEEK_SET) == (off_t)-1) {
1.1 misho 338: file_badseek(ms);
339: return -1;
340: }
1.1.1.2 misho 341: bufsize = FINFO_READ_FUNC(fd, nbuf,
1.1 misho 342: ((xph_filesz < sizeof(nbuf)) ? xph_filesz : sizeof(nbuf)));
343: if (bufsize == -1) {
344: file_badread(ms);
345: return -1;
346: }
347: offset = 0;
348: for (;;) {
349: if (offset >= (size_t)bufsize)
350: break;
351: offset = donote(ms, nbuf, offset, (size_t)bufsize,
352: clazz, swap, 4, flags);
353: if (offset == 0)
354: break;
355:
356: }
357: }
358: return 0;
359: }
360: #endif
361:
362: private size_t
1.1.1.3 ! misho 363: donote(struct magic_set *ms, void *vbuf, size_t offset, size_t size,
1.1 misho 364: int clazz, int swap, size_t align, int *flags)
365: {
366: Elf32_Nhdr nh32;
367: Elf64_Nhdr nh64;
368: size_t noff, doff;
369: #ifdef ELFCORE
370: int os_style = -1;
371: #endif
372: uint32_t namesz, descsz;
1.1.1.3 ! misho 373: unsigned char *nbuf = CAST(unsigned char *, vbuf);
1.1 misho 374:
375: (void)memcpy(xnh_addr, &nbuf[offset], xnh_sizeof);
376: offset += xnh_sizeof;
377:
378: namesz = xnh_namesz;
379: descsz = xnh_descsz;
380: if ((namesz == 0) && (descsz == 0)) {
381: /*
382: * We're out of note headers.
383: */
384: return (offset >= size) ? offset : size;
385: }
386:
387: if (namesz & 0x80000000) {
388: (void)file_printf(ms, ", bad note name size 0x%lx",
389: (unsigned long)namesz);
390: return offset;
391: }
392:
393: if (descsz & 0x80000000) {
394: (void)file_printf(ms, ", bad note description size 0x%lx",
395: (unsigned long)descsz);
396: return offset;
397: }
398:
399:
400: noff = offset;
401: doff = ELF_ALIGN(offset + namesz);
402:
403: if (offset + namesz > size) {
404: /*
405: * We're past the end of the buffer.
406: */
407: return doff;
408: }
409:
410: offset = ELF_ALIGN(doff + descsz);
411: if (doff + descsz > size) {
412: /*
413: * We're past the end of the buffer.
414: */
415: return (offset >= size) ? offset : size;
416: }
417:
1.1.1.2 misho 418: if ((*flags & (FLAGS_DID_NOTE|FLAGS_DID_BUILD_ID)) ==
419: (FLAGS_DID_NOTE|FLAGS_DID_BUILD_ID))
1.1 misho 420: goto core;
421:
1.1.1.3 ! misho 422: if (namesz == 5 && strcmp((char *)&nbuf[noff], "SuSE") == 0 &&
! 423: xnh_type == NT_GNU_VERSION && descsz == 2) {
! 424: file_printf(ms, ", for SuSE %d.%d", nbuf[doff], nbuf[doff + 1]);
! 425: }
1.1 misho 426: if (namesz == 4 && strcmp((char *)&nbuf[noff], "GNU") == 0 &&
427: xnh_type == NT_GNU_VERSION && descsz == 16) {
428: uint32_t desc[4];
429: (void)memcpy(desc, &nbuf[doff], sizeof(desc));
430:
431: if (file_printf(ms, ", for GNU/") == -1)
432: return size;
433: switch (elf_getu32(swap, desc[0])) {
434: case GNU_OS_LINUX:
435: if (file_printf(ms, "Linux") == -1)
436: return size;
437: break;
438: case GNU_OS_HURD:
439: if (file_printf(ms, "Hurd") == -1)
440: return size;
441: break;
442: case GNU_OS_SOLARIS:
443: if (file_printf(ms, "Solaris") == -1)
444: return size;
445: break;
446: case GNU_OS_KFREEBSD:
447: if (file_printf(ms, "kFreeBSD") == -1)
448: return size;
449: break;
450: case GNU_OS_KNETBSD:
451: if (file_printf(ms, "kNetBSD") == -1)
452: return size;
453: break;
454: default:
455: if (file_printf(ms, "<unknown>") == -1)
456: return size;
457: }
458: if (file_printf(ms, " %d.%d.%d", elf_getu32(swap, desc[1]),
459: elf_getu32(swap, desc[2]), elf_getu32(swap, desc[3])) == -1)
460: return size;
461: *flags |= FLAGS_DID_NOTE;
462: return size;
463: }
464:
1.1.1.2 misho 465: if (namesz == 4 && strcmp((char *)&nbuf[noff], "GNU") == 0 &&
466: xnh_type == NT_GNU_BUILD_ID && (descsz == 16 || descsz == 20)) {
1.1.1.3 ! misho 467: uint8_t desc[20];
! 468: uint32_t i;
! 469: if (file_printf(ms, ", BuildID[%s]=", descsz == 16 ? "md5/uuid" :
1.1.1.2 misho 470: "sha1") == -1)
471: return size;
472: (void)memcpy(desc, &nbuf[doff], descsz);
1.1.1.3 ! misho 473: for (i = 0; i < descsz; i++)
! 474: if (file_printf(ms, "%02x", desc[i]) == -1)
1.1.1.2 misho 475: return size;
476: *flags |= FLAGS_DID_BUILD_ID;
477: }
478:
1.1 misho 479: if (namesz == 7 && strcmp((char *)&nbuf[noff], "NetBSD") == 0 &&
480: xnh_type == NT_NETBSD_VERSION && descsz == 4) {
481: uint32_t desc;
482: (void)memcpy(&desc, &nbuf[doff], sizeof(desc));
483: desc = elf_getu32(swap, desc);
484:
485: if (file_printf(ms, ", for NetBSD") == -1)
486: return size;
487: /*
488: * The version number used to be stuck as 199905, and was thus
489: * basically content-free. Newer versions of NetBSD have fixed
490: * this and now use the encoding of __NetBSD_Version__:
491: *
492: * MMmmrrpp00
493: *
494: * M = major version
495: * m = minor version
496: * r = release ["",A-Z,Z[A-Z] but numeric]
497: * p = patchlevel
498: */
499: if (desc > 100000000U) {
500: uint32_t ver_patch = (desc / 100) % 100;
501: uint32_t ver_rel = (desc / 10000) % 100;
502: uint32_t ver_min = (desc / 1000000) % 100;
503: uint32_t ver_maj = desc / 100000000;
504:
505: if (file_printf(ms, " %u.%u", ver_maj, ver_min) == -1)
506: return size;
507: if (ver_rel == 0 && ver_patch != 0) {
508: if (file_printf(ms, ".%u", ver_patch) == -1)
509: return size;
510: } else if (ver_rel != 0) {
511: while (ver_rel > 26) {
512: if (file_printf(ms, "Z") == -1)
513: return size;
514: ver_rel -= 26;
515: }
516: if (file_printf(ms, "%c", 'A' + ver_rel - 1)
517: == -1)
518: return size;
519: }
520: }
521: *flags |= FLAGS_DID_NOTE;
522: return size;
523: }
524:
525: if (namesz == 8 && strcmp((char *)&nbuf[noff], "FreeBSD") == 0 &&
526: xnh_type == NT_FREEBSD_VERSION && descsz == 4) {
527: uint32_t desc;
528: (void)memcpy(&desc, &nbuf[doff], sizeof(desc));
529: desc = elf_getu32(swap, desc);
530: if (file_printf(ms, ", for FreeBSD") == -1)
531: return size;
532:
533: /*
534: * Contents is __FreeBSD_version, whose relation to OS
535: * versions is defined by a huge table in the Porter's
536: * Handbook. This is the general scheme:
537: *
538: * Releases:
539: * Mmp000 (before 4.10)
540: * Mmi0p0 (before 5.0)
541: * Mmm0p0
542: *
543: * Development branches:
544: * Mmpxxx (before 4.6)
545: * Mmp1xx (before 4.10)
546: * Mmi1xx (before 5.0)
547: * M000xx (pre-M.0)
548: * Mmm1xx
549: *
550: * M = major version
551: * m = minor version
552: * i = minor version increment (491000 -> 4.10)
553: * p = patchlevel
554: * x = revision
555: *
556: * The first release of FreeBSD to use ELF by default
557: * was version 3.0.
558: */
559: if (desc == 460002) {
560: if (file_printf(ms, " 4.6.2") == -1)
561: return size;
562: } else if (desc < 460100) {
563: if (file_printf(ms, " %d.%d", desc / 100000,
564: desc / 10000 % 10) == -1)
565: return size;
566: if (desc / 1000 % 10 > 0)
567: if (file_printf(ms, ".%d", desc / 1000 % 10)
568: == -1)
569: return size;
570: if ((desc % 1000 > 0) || (desc % 100000 == 0))
571: if (file_printf(ms, " (%d)", desc) == -1)
572: return size;
573: } else if (desc < 500000) {
574: if (file_printf(ms, " %d.%d", desc / 100000,
575: desc / 10000 % 10 + desc / 1000 % 10) == -1)
576: return size;
577: if (desc / 100 % 10 > 0) {
578: if (file_printf(ms, " (%d)", desc) == -1)
579: return size;
580: } else if (desc / 10 % 10 > 0) {
581: if (file_printf(ms, ".%d", desc / 10 % 10)
582: == -1)
583: return size;
584: }
585: } else {
586: if (file_printf(ms, " %d.%d", desc / 100000,
587: desc / 1000 % 100) == -1)
588: return size;
589: if ((desc / 100 % 10 > 0) ||
590: (desc % 100000 / 100 == 0)) {
591: if (file_printf(ms, " (%d)", desc) == -1)
592: return size;
593: } else if (desc / 10 % 10 > 0) {
594: if (file_printf(ms, ".%d", desc / 10 % 10)
595: == -1)
596: return size;
597: }
598: }
599: *flags |= FLAGS_DID_NOTE;
600: return size;
601: }
602:
603: if (namesz == 8 && strcmp((char *)&nbuf[noff], "OpenBSD") == 0 &&
604: xnh_type == NT_OPENBSD_VERSION && descsz == 4) {
605: if (file_printf(ms, ", for OpenBSD") == -1)
606: return size;
607: /* Content of note is always 0 */
608: *flags |= FLAGS_DID_NOTE;
609: return size;
610: }
611:
612: if (namesz == 10 && strcmp((char *)&nbuf[noff], "DragonFly") == 0 &&
613: xnh_type == NT_DRAGONFLY_VERSION && descsz == 4) {
614: uint32_t desc;
615: if (file_printf(ms, ", for DragonFly") == -1)
616: return size;
617: (void)memcpy(&desc, &nbuf[doff], sizeof(desc));
618: desc = elf_getu32(swap, desc);
619: if (file_printf(ms, " %d.%d.%d", desc / 100000,
620: desc / 10000 % 10, desc % 10000) == -1)
621: return size;
622: *flags |= FLAGS_DID_NOTE;
623: return size;
624: }
625:
626: core:
627: /*
628: * Sigh. The 2.0.36 kernel in Debian 2.1, at
629: * least, doesn't correctly implement name
630: * sections, in core dumps, as specified by
631: * the "Program Linking" section of "UNIX(R) System
632: * V Release 4 Programmer's Guide: ANSI C and
633: * Programming Support Tools", because my copy
634: * clearly says "The first 'namesz' bytes in 'name'
635: * contain a *null-terminated* [emphasis mine]
636: * character representation of the entry's owner
637: * or originator", but the 2.0.36 kernel code
638: * doesn't include the terminating null in the
639: * name....
640: */
641: if ((namesz == 4 && strncmp((char *)&nbuf[noff], "CORE", 4) == 0) ||
642: (namesz == 5 && strcmp((char *)&nbuf[noff], "CORE") == 0)) {
643: os_style = OS_STYLE_SVR4;
644: }
645:
646: if ((namesz == 8 && strcmp((char *)&nbuf[noff], "FreeBSD") == 0)) {
647: os_style = OS_STYLE_FREEBSD;
648: }
649:
650: if ((namesz >= 11 && strncmp((char *)&nbuf[noff], "NetBSD-CORE", 11)
651: == 0)) {
652: os_style = OS_STYLE_NETBSD;
653: }
654:
655: #ifdef ELFCORE
656: if ((*flags & FLAGS_DID_CORE) != 0)
657: return size;
658:
659: if (os_style != -1 && (*flags & FLAGS_DID_CORE_STYLE) == 0) {
660: if (file_printf(ms, ", %s-style", os_style_names[os_style])
661: == -1)
662: return size;
663: *flags |= FLAGS_DID_CORE_STYLE;
664: }
665:
666: switch (os_style) {
667: case OS_STYLE_NETBSD:
668: if (xnh_type == NT_NETBSD_CORE_PROCINFO) {
669: uint32_t signo;
670: /*
671: * Extract the program name. It is at
672: * offset 0x7c, and is up to 32-bytes,
673: * including the terminating NUL.
674: */
675: if (file_printf(ms, ", from '%.31s'",
676: &nbuf[doff + 0x7c]) == -1)
677: return size;
678:
679: /*
680: * Extract the signal number. It is at
681: * offset 0x08.
682: */
683: (void)memcpy(&signo, &nbuf[doff + 0x08],
684: sizeof(signo));
685: if (file_printf(ms, " (signal %u)",
686: elf_getu32(swap, signo)) == -1)
687: return size;
688: *flags |= FLAGS_DID_CORE;
689: return size;
690: }
691: break;
692:
693: default:
1.1.1.2 misho 694: if (xnh_type == NT_PRPSINFO && *flags & FLAGS_IS_CORE) {
1.1 misho 695: size_t i, j;
696: unsigned char c;
697: /*
698: * Extract the program name. We assume
699: * it to be 16 characters (that's what it
700: * is in SunOS 5.x and Linux).
701: *
702: * Unfortunately, it's at a different offset
703: * in various OSes, so try multiple offsets.
704: * If the characters aren't all printable,
705: * reject it.
706: */
707: for (i = 0; i < NOFFSETS; i++) {
708: unsigned char *cname, *cp;
709: size_t reloffset = prpsoffsets(i);
710: size_t noffset = doff + reloffset;
1.1.1.2 misho 711: size_t k;
1.1 misho 712: for (j = 0; j < 16; j++, noffset++,
713: reloffset++) {
714: /*
715: * Make sure we're not past
716: * the end of the buffer; if
717: * we are, just give up.
718: */
719: if (noffset >= size)
720: goto tryanother;
721:
722: /*
723: * Make sure we're not past
724: * the end of the contents;
725: * if we are, this obviously
726: * isn't the right offset.
727: */
728: if (reloffset >= descsz)
729: goto tryanother;
730:
731: c = nbuf[noffset];
732: if (c == '\0') {
733: /*
734: * A '\0' at the
735: * beginning is
736: * obviously wrong.
737: * Any other '\0'
738: * means we're done.
739: */
740: if (j == 0)
741: goto tryanother;
742: else
743: break;
744: } else {
745: /*
746: * A nonprintable
747: * character is also
748: * wrong.
749: */
750: if (!isprint(c) || isquote(c))
751: goto tryanother;
752: }
753: }
754: /*
755: * Well, that worked.
756: */
1.1.1.2 misho 757:
758: /*
759: * Try next offsets, in case this match is
760: * in the middle of a string.
761: */
762: for (k = i + 1 ; k < NOFFSETS ; k++) {
763: size_t no;
764: int adjust = 1;
765: if (prpsoffsets(k) >= prpsoffsets(i))
766: continue;
767: for (no = doff + prpsoffsets(k);
768: no < doff + prpsoffsets(i); no++)
769: adjust = adjust
770: && isprint(nbuf[no]);
771: if (adjust)
772: i = k;
773: }
774:
1.1 misho 775: cname = (unsigned char *)
776: &nbuf[doff + prpsoffsets(i)];
777: for (cp = cname; *cp && isprint(*cp); cp++)
778: continue;
779: /*
780: * Linux apparently appends a space at the end
781: * of the command line: remove it.
782: */
783: while (cp > cname && isspace(cp[-1]))
784: cp--;
785: if (file_printf(ms, ", from '%.*s'",
786: (int)(cp - cname), cname) == -1)
787: return size;
788: *flags |= FLAGS_DID_CORE;
789: return size;
790:
791: tryanother:
792: ;
793: }
794: }
795: break;
796: }
797: #endif
798: return offset;
799: }
800:
801: /* SunOS 5.x hardware capability descriptions */
802: typedef struct cap_desc {
803: uint64_t cd_mask;
804: const char *cd_name;
805: } cap_desc_t;
806:
807: static const cap_desc_t cap_desc_sparc[] = {
808: { AV_SPARC_MUL32, "MUL32" },
809: { AV_SPARC_DIV32, "DIV32" },
810: { AV_SPARC_FSMULD, "FSMULD" },
811: { AV_SPARC_V8PLUS, "V8PLUS" },
812: { AV_SPARC_POPC, "POPC" },
813: { AV_SPARC_VIS, "VIS" },
814: { AV_SPARC_VIS2, "VIS2" },
815: { AV_SPARC_ASI_BLK_INIT, "ASI_BLK_INIT" },
816: { AV_SPARC_FMAF, "FMAF" },
817: { AV_SPARC_FJFMAU, "FJFMAU" },
818: { AV_SPARC_IMA, "IMA" },
819: { 0, NULL }
820: };
821:
822: static const cap_desc_t cap_desc_386[] = {
823: { AV_386_FPU, "FPU" },
824: { AV_386_TSC, "TSC" },
825: { AV_386_CX8, "CX8" },
826: { AV_386_SEP, "SEP" },
827: { AV_386_AMD_SYSC, "AMD_SYSC" },
828: { AV_386_CMOV, "CMOV" },
829: { AV_386_MMX, "MMX" },
830: { AV_386_AMD_MMX, "AMD_MMX" },
831: { AV_386_AMD_3DNow, "AMD_3DNow" },
832: { AV_386_AMD_3DNowx, "AMD_3DNowx" },
833: { AV_386_FXSR, "FXSR" },
834: { AV_386_SSE, "SSE" },
835: { AV_386_SSE2, "SSE2" },
836: { AV_386_PAUSE, "PAUSE" },
837: { AV_386_SSE3, "SSE3" },
838: { AV_386_MON, "MON" },
839: { AV_386_CX16, "CX16" },
840: { AV_386_AHF, "AHF" },
841: { AV_386_TSCP, "TSCP" },
842: { AV_386_AMD_SSE4A, "AMD_SSE4A" },
843: { AV_386_POPCNT, "POPCNT" },
844: { AV_386_AMD_LZCNT, "AMD_LZCNT" },
845: { AV_386_SSSE3, "SSSE3" },
846: { AV_386_SSE4_1, "SSE4.1" },
847: { AV_386_SSE4_2, "SSE4.2" },
848: { 0, NULL }
849: };
850:
851: private int
852: doshn(struct magic_set *ms, int clazz, int swap, int fd, off_t off, int num,
1.1.1.3 ! misho 853: size_t size, off_t fsize, int *flags, int mach, int strtab)
1.1 misho 854: {
855: Elf32_Shdr sh32;
856: Elf64_Shdr sh64;
857: int stripped = 1;
858: void *nbuf;
1.1.1.3 ! misho 859: off_t noff, coff, name_off;
1.1 misho 860: uint64_t cap_hw1 = 0; /* SunOS 5.x hardware capabilites */
861: uint64_t cap_sf1 = 0; /* SunOS 5.x software capabilites */
1.1.1.3 ! misho 862: char name[50];
1.1 misho 863:
864: if (size != xsh_sizeof) {
865: if (file_printf(ms, ", corrupted section header size") == -1)
866: return -1;
867: return 0;
868: }
869:
870: for ( ; num; num--) {
1.1.1.2 misho 871: if (FINFO_LSEEK_FUNC(fd, off, SEEK_SET) == (off_t)-1) {
872: file_badseek(ms);
873: return -1;
874: }
875: if (FINFO_READ_FUNC(fd, xsh_addr, xsh_sizeof) == -1) {
1.1 misho 876: file_badread(ms);
877: return -1;
878: }
1.1.1.2 misho 879: off += size;
880:
881: /* Things we can determine before we seek */
1.1 misho 882: switch (xsh_type) {
883: case SHT_SYMTAB:
884: #if 0
885: case SHT_DYNSYM:
886: #endif
887: stripped = 0;
888: break;
1.1.1.2 misho 889: default:
890: if (xsh_offset > fsize) {
891: /* Perhaps warn here */
892: continue;
1.1 misho 893: }
1.1.1.2 misho 894: break;
895: }
896:
897: /* Things we can determine when we seek */
898: switch (xsh_type) {
899: case SHT_NOTE:
1.1 misho 900: nbuf = emalloc((size_t)xsh_size);
1.1.1.2 misho 901: if ((noff = FINFO_LSEEK_FUNC(fd, (off_t)xsh_offset, SEEK_SET)) ==
1.1 misho 902: (off_t)-1) {
903: file_badread(ms);
904: efree(nbuf);
905: return -1;
906: }
1.1.1.2 misho 907: if (FINFO_READ_FUNC(fd, nbuf, (size_t)xsh_size) !=
1.1 misho 908: (ssize_t)xsh_size) {
909: efree(nbuf);
910: file_badread(ms);
911: return -1;
912: }
913:
914: noff = 0;
915: for (;;) {
916: if (noff >= (off_t)xsh_size)
917: break;
918: noff = donote(ms, nbuf, (size_t)noff,
919: (size_t)xsh_size, clazz, swap, 4,
920: flags);
921: if (noff == 0)
922: break;
923: }
924: efree(nbuf);
925: break;
926: case SHT_SUNW_cap:
1.1.1.2 misho 927: if (FINFO_LSEEK_FUNC(fd, (off_t)xsh_offset, SEEK_SET) ==
1.1 misho 928: (off_t)-1) {
1.1.1.2 misho 929: file_badseek(ms);
1.1 misho 930: return -1;
931: }
932: coff = 0;
933: for (;;) {
934: Elf32_Cap cap32;
935: Elf64_Cap cap64;
936: char cbuf[/*CONSTCOND*/
937: MAX(sizeof cap32, sizeof cap64)];
1.1.1.2 misho 938: if ((coff += xcap_sizeof) > (off_t)xsh_size)
1.1 misho 939: break;
1.1.1.2 misho 940: if (FINFO_READ_FUNC(fd, cbuf, (size_t)xcap_sizeof) !=
1.1 misho 941: (ssize_t)xcap_sizeof) {
942: file_badread(ms);
943: return -1;
944: }
945: (void)memcpy(xcap_addr, cbuf, xcap_sizeof);
946: switch (xcap_tag) {
947: case CA_SUNW_NULL:
948: break;
949: case CA_SUNW_HW_1:
950: cap_hw1 |= xcap_val;
951: break;
952: case CA_SUNW_SF_1:
953: cap_sf1 |= xcap_val;
954: break;
955: default:
956: if (file_printf(ms,
957: ", with unknown capability "
1.1.1.2 misho 958: "0x%" INT64_T_FORMAT "x = 0x%"
959: INT64_T_FORMAT "x",
1.1 misho 960: (unsigned long long)xcap_tag,
961: (unsigned long long)xcap_val) == -1)
962: return -1;
963: break;
964: }
965: }
966: break;
1.1.1.2 misho 967:
968: default:
969: break;
1.1 misho 970: }
971: }
972: if (file_printf(ms, ", %sstripped", stripped ? "" : "not ") == -1)
973: return -1;
974: if (cap_hw1) {
975: const cap_desc_t *cdp;
976: switch (mach) {
977: case EM_SPARC:
978: case EM_SPARC32PLUS:
979: case EM_SPARCV9:
980: cdp = cap_desc_sparc;
981: break;
982: case EM_386:
983: case EM_IA_64:
984: case EM_AMD64:
985: cdp = cap_desc_386;
986: break;
987: default:
988: cdp = NULL;
989: break;
990: }
991: if (file_printf(ms, ", uses") == -1)
992: return -1;
993: if (cdp) {
994: while (cdp->cd_name) {
995: if (cap_hw1 & cdp->cd_mask) {
996: if (file_printf(ms,
997: " %s", cdp->cd_name) == -1)
998: return -1;
999: cap_hw1 &= ~cdp->cd_mask;
1000: }
1001: ++cdp;
1002: }
1003: if (cap_hw1)
1004: if (file_printf(ms,
1.1.1.2 misho 1005: " unknown hardware capability 0x%"
1006: INT64_T_FORMAT "x",
1.1 misho 1007: (unsigned long long)cap_hw1) == -1)
1008: return -1;
1009: } else {
1010: if (file_printf(ms,
1.1.1.2 misho 1011: " hardware capability 0x%" INT64_T_FORMAT "x",
1.1 misho 1012: (unsigned long long)cap_hw1) == -1)
1013: return -1;
1014: }
1015: }
1016: if (cap_sf1) {
1017: if (cap_sf1 & SF1_SUNW_FPUSED) {
1018: if (file_printf(ms,
1019: (cap_sf1 & SF1_SUNW_FPKNWN)
1020: ? ", uses frame pointer"
1021: : ", not known to use frame pointer") == -1)
1022: return -1;
1023: }
1024: cap_sf1 &= ~SF1_SUNW_MASK;
1025: if (cap_sf1)
1026: if (file_printf(ms,
1.1.1.2 misho 1027: ", with unknown software capability 0x%"
1028: INT64_T_FORMAT "x",
1.1 misho 1029: (unsigned long long)cap_sf1) == -1)
1030: return -1;
1031: }
1032: return 0;
1033: }
1034:
1035: /*
1036: * Look through the program headers of an executable image, searching
1037: * for a PT_INTERP section; if one is found, it's dynamically linked,
1038: * otherwise it's statically linked.
1039: */
1040: private int
1041: dophn_exec(struct magic_set *ms, int clazz, int swap, int fd, off_t off,
1042: int num, size_t size, off_t fsize, int *flags, int sh_num)
1043: {
1044: Elf32_Phdr ph32;
1045: Elf64_Phdr ph64;
1046: const char *linking_style = "statically";
1047: const char *shared_libraries = "";
1048: unsigned char nbuf[BUFSIZ];
1.1.1.2 misho 1049: ssize_t bufsize;
1.1 misho 1050: size_t offset, align;
1051:
1052: if (size != xph_sizeof) {
1053: if (file_printf(ms, ", corrupted program header size") == -1)
1054: return -1;
1055: return 0;
1056: }
1057:
1058: for ( ; num; num--) {
1.1.1.2 misho 1059: if (FINFO_LSEEK_FUNC(fd, off, SEEK_SET) == (off_t)-1) {
1060: file_badseek(ms);
1.1 misho 1061: return -1;
1062: }
1063:
1.1.1.2 misho 1064: if (FINFO_READ_FUNC(fd, xph_addr, xph_sizeof) == -1) {
1065: file_badread(ms);
1.1 misho 1066: return -1;
1067: }
1068:
1.1.1.2 misho 1069: off += size;
1.1 misho 1070:
1.1.1.2 misho 1071: /* Things we can determine before we seek */
1.1 misho 1072: switch (xph_type) {
1073: case PT_DYNAMIC:
1074: linking_style = "dynamically";
1075: break;
1076: case PT_INTERP:
1077: shared_libraries = " (uses shared libs)";
1078: break;
1.1.1.2 misho 1079: default:
1080: if (xph_offset > fsize) {
1081: /* Maybe warn here? */
1082: continue;
1083: }
1084: break;
1085: }
1086:
1087: /* Things we can determine when we seek */
1088: switch (xph_type) {
1.1 misho 1089: case PT_NOTE:
1.1.1.2 misho 1090: if ((align = xph_align) & 0x80000000UL) {
1.1 misho 1091: if (file_printf(ms,
1092: ", invalid note alignment 0x%lx",
1093: (unsigned long)align) == -1)
1094: return -1;
1095: align = 4;
1096: }
1097: if (sh_num)
1098: break;
1099: /*
1100: * This is a PT_NOTE section; loop through all the notes
1101: * in the section.
1102: */
1.1.1.2 misho 1103: if (FINFO_LSEEK_FUNC(fd, xph_offset, SEEK_SET) == (off_t)-1) {
1.1 misho 1104: file_badseek(ms);
1105: return -1;
1106: }
1.1.1.2 misho 1107: bufsize = FINFO_READ_FUNC(fd, nbuf, ((xph_filesz < sizeof(nbuf)) ?
1.1 misho 1108: xph_filesz : sizeof(nbuf)));
1109: if (bufsize == -1) {
1110: file_badread(ms);
1111: return -1;
1112: }
1113: offset = 0;
1114: for (;;) {
1115: if (offset >= (size_t)bufsize)
1116: break;
1117: offset = donote(ms, nbuf, offset,
1118: (size_t)bufsize, clazz, swap, align,
1119: flags);
1120: if (offset == 0)
1121: break;
1122: }
1123: break;
1124: default:
1125: break;
1126: }
1127: }
1128: if (file_printf(ms, ", %s linked%s", linking_style, shared_libraries)
1129: == -1)
1130: return -1;
1131: return 0;
1132: }
1133:
1134:
1135: protected int
1136: file_tryelf(struct magic_set *ms, int fd, const unsigned char *buf,
1137: size_t nbytes)
1138: {
1139: union {
1140: int32_t l;
1141: char c[sizeof (int32_t)];
1142: } u;
1143: int clazz;
1144: int swap;
1145: struct stat st;
1146: off_t fsize;
1147: int flags = 0;
1148: Elf32_Ehdr elf32hdr;
1149: Elf64_Ehdr elf64hdr;
1150: uint16_t type;
1151:
1152: if (ms->flags & (MAGIC_MIME|MAGIC_APPLE))
1153: return 0;
1154: /*
1155: * ELF executables have multiple section headers in arbitrary
1156: * file locations and thus file(1) cannot determine it from easily.
1157: * Instead we traverse thru all section headers until a symbol table
1158: * one is found or else the binary is stripped.
1159: * Return immediately if it's not ELF (so we avoid pipe2file unless needed).
1160: */
1161: if (buf[EI_MAG0] != ELFMAG0
1162: || (buf[EI_MAG1] != ELFMAG1 && buf[EI_MAG1] != OLFMAG1)
1163: || buf[EI_MAG2] != ELFMAG2 || buf[EI_MAG3] != ELFMAG3)
1164: return 0;
1165:
1166: /*
1167: * If we cannot seek, it must be a pipe, socket or fifo.
1168: */
1.1.1.2 misho 1169: if((FINFO_LSEEK_FUNC(fd, (off_t)0, SEEK_SET) == (off_t)-1) && (errno == ESPIPE))
1.1 misho 1170: fd = file_pipe2file(ms, fd, buf, nbytes);
1171:
1172: if (fstat(fd, &st) == -1) {
1173: file_badread(ms);
1174: return -1;
1175: }
1176: fsize = st.st_size;
1177:
1178: clazz = buf[EI_CLASS];
1179:
1180: switch (clazz) {
1181: case ELFCLASS32:
1182: #undef elf_getu
1183: #define elf_getu(a, b) elf_getu32(a, b)
1184: #undef elfhdr
1185: #define elfhdr elf32hdr
1186: #include "elfclass.h"
1187: case ELFCLASS64:
1188: #undef elf_getu
1189: #define elf_getu(a, b) elf_getu64(a, b)
1190: #undef elfhdr
1191: #define elfhdr elf64hdr
1192: #include "elfclass.h"
1193: default:
1194: if (file_printf(ms, ", unknown class %d", clazz) == -1)
1195: return -1;
1196: break;
1197: }
1198: return 0;
1199: }
1200: #endif