Annotation of embedaddon/php/ext/fileinfo/libmagic/readelf.c, revision 1.1.1.2
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
1.1.1.2 ! misho 30: FILE_RCSID("@(#)$File: readelf.c,v 1.90 2011/08/23 08:01:12 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 \
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))
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))
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:
1.1.1.2 ! misho 286: #define FLAGS_DID_CORE 0x01
! 287: #define FLAGS_DID_NOTE 0x02
! 288: #define FLAGS_DID_BUILD_ID 0x04
! 289: #define FLAGS_DID_CORE_STYLE 0x08
! 290: #define FLAGS_IS_CORE 0x10
1.1 misho 291:
292: private int
293: dophn_core(struct magic_set *ms, int clazz, int swap, int fd, off_t off,
294: int num, size_t size, off_t fsize, int *flags)
295: {
296: Elf32_Phdr ph32;
297: Elf64_Phdr ph64;
298: size_t offset;
299: unsigned char nbuf[BUFSIZ];
300: ssize_t bufsize;
301:
302: if (size != xph_sizeof) {
303: if (file_printf(ms, ", corrupted program header size") == -1)
304: return -1;
305: return 0;
306: }
307:
308: /*
309: * Loop through all the program headers.
310: */
311: for ( ; num; num--) {
1.1.1.2 ! misho 312: if (FINFO_LSEEK_FUNC(fd, off, SEEK_SET) == (off_t)-1) {
1.1 misho 313: file_badseek(ms);
314: return -1;
315: }
1.1.1.2 ! misho 316: if (FINFO_READ_FUNC(fd, xph_addr, xph_sizeof) == -1) {
1.1 misho 317: file_badread(ms);
318: return -1;
319: }
1.1.1.2 ! misho 320: off += size;
! 321:
1.1 misho 322: if (xph_offset > fsize) {
1.1.1.2 ! misho 323: /* Perhaps warn here */
1.1 misho 324: continue;
325: }
326:
327: if (xph_type != PT_NOTE)
328: continue;
329:
330: /*
331: * This is a PT_NOTE section; loop through all the notes
332: * in the section.
333: */
1.1.1.2 ! misho 334: if (FINFO_LSEEK_FUNC(fd, xph_offset, SEEK_SET) == (off_t)-1) {
1.1 misho 335: file_badseek(ms);
336: return -1;
337: }
1.1.1.2 ! misho 338: bufsize = FINFO_READ_FUNC(fd, nbuf,
1.1 misho 339: ((xph_filesz < sizeof(nbuf)) ? xph_filesz : sizeof(nbuf)));
340: if (bufsize == -1) {
341: file_badread(ms);
342: return -1;
343: }
344: offset = 0;
345: for (;;) {
346: if (offset >= (size_t)bufsize)
347: break;
348: offset = donote(ms, nbuf, offset, (size_t)bufsize,
349: clazz, swap, 4, flags);
350: if (offset == 0)
351: break;
352:
353: }
354: }
355: return 0;
356: }
357: #endif
358:
359: private size_t
360: donote(struct magic_set *ms, unsigned char *nbuf, size_t offset, size_t size,
361: int clazz, int swap, size_t align, int *flags)
362: {
363: Elf32_Nhdr nh32;
364: Elf64_Nhdr nh64;
365: size_t noff, doff;
366: #ifdef ELFCORE
367: int os_style = -1;
368: #endif
369: uint32_t namesz, descsz;
370:
371: (void)memcpy(xnh_addr, &nbuf[offset], xnh_sizeof);
372: offset += xnh_sizeof;
373:
374: namesz = xnh_namesz;
375: descsz = xnh_descsz;
376: if ((namesz == 0) && (descsz == 0)) {
377: /*
378: * We're out of note headers.
379: */
380: return (offset >= size) ? offset : size;
381: }
382:
383: if (namesz & 0x80000000) {
384: (void)file_printf(ms, ", bad note name size 0x%lx",
385: (unsigned long)namesz);
386: return offset;
387: }
388:
389: if (descsz & 0x80000000) {
390: (void)file_printf(ms, ", bad note description size 0x%lx",
391: (unsigned long)descsz);
392: return offset;
393: }
394:
395:
396: noff = offset;
397: doff = ELF_ALIGN(offset + namesz);
398:
399: if (offset + namesz > size) {
400: /*
401: * We're past the end of the buffer.
402: */
403: return doff;
404: }
405:
406: offset = ELF_ALIGN(doff + descsz);
407: if (doff + descsz > size) {
408: /*
409: * We're past the end of the buffer.
410: */
411: return (offset >= size) ? offset : size;
412: }
413:
1.1.1.2 ! misho 414: if ((*flags & (FLAGS_DID_NOTE|FLAGS_DID_BUILD_ID)) ==
! 415: (FLAGS_DID_NOTE|FLAGS_DID_BUILD_ID))
1.1 misho 416: goto core;
417:
418: if (namesz == 4 && strcmp((char *)&nbuf[noff], "GNU") == 0 &&
419: xnh_type == NT_GNU_VERSION && descsz == 16) {
420: uint32_t desc[4];
421: (void)memcpy(desc, &nbuf[doff], sizeof(desc));
422:
423: if (file_printf(ms, ", for GNU/") == -1)
424: return size;
425: switch (elf_getu32(swap, desc[0])) {
426: case GNU_OS_LINUX:
427: if (file_printf(ms, "Linux") == -1)
428: return size;
429: break;
430: case GNU_OS_HURD:
431: if (file_printf(ms, "Hurd") == -1)
432: return size;
433: break;
434: case GNU_OS_SOLARIS:
435: if (file_printf(ms, "Solaris") == -1)
436: return size;
437: break;
438: case GNU_OS_KFREEBSD:
439: if (file_printf(ms, "kFreeBSD") == -1)
440: return size;
441: break;
442: case GNU_OS_KNETBSD:
443: if (file_printf(ms, "kNetBSD") == -1)
444: return size;
445: break;
446: default:
447: if (file_printf(ms, "<unknown>") == -1)
448: return size;
449: }
450: if (file_printf(ms, " %d.%d.%d", elf_getu32(swap, desc[1]),
451: elf_getu32(swap, desc[2]), elf_getu32(swap, desc[3])) == -1)
452: return size;
453: *flags |= FLAGS_DID_NOTE;
454: return size;
455: }
456:
1.1.1.2 ! misho 457: if (namesz == 4 && strcmp((char *)&nbuf[noff], "GNU") == 0 &&
! 458: xnh_type == NT_GNU_BUILD_ID && (descsz == 16 || descsz == 20)) {
! 459: uint32_t desc[5], i;
! 460: if (file_printf(ms, ", BuildID[%s]=0x", descsz == 16 ? "md5/uuid" :
! 461: "sha1") == -1)
! 462: return size;
! 463: (void)memcpy(desc, &nbuf[doff], descsz);
! 464: for (i = 0; i < descsz >> 2; i++)
! 465: if (file_printf(ms, "%.8x", desc[i]) == -1)
! 466: return size;
! 467: *flags |= FLAGS_DID_BUILD_ID;
! 468: }
! 469:
1.1 misho 470: if (namesz == 7 && strcmp((char *)&nbuf[noff], "NetBSD") == 0 &&
471: xnh_type == NT_NETBSD_VERSION && descsz == 4) {
472: uint32_t desc;
473: (void)memcpy(&desc, &nbuf[doff], sizeof(desc));
474: desc = elf_getu32(swap, desc);
475:
476: if (file_printf(ms, ", for NetBSD") == -1)
477: return size;
478: /*
479: * The version number used to be stuck as 199905, and was thus
480: * basically content-free. Newer versions of NetBSD have fixed
481: * this and now use the encoding of __NetBSD_Version__:
482: *
483: * MMmmrrpp00
484: *
485: * M = major version
486: * m = minor version
487: * r = release ["",A-Z,Z[A-Z] but numeric]
488: * p = patchlevel
489: */
490: if (desc > 100000000U) {
491: uint32_t ver_patch = (desc / 100) % 100;
492: uint32_t ver_rel = (desc / 10000) % 100;
493: uint32_t ver_min = (desc / 1000000) % 100;
494: uint32_t ver_maj = desc / 100000000;
495:
496: if (file_printf(ms, " %u.%u", ver_maj, ver_min) == -1)
497: return size;
498: if (ver_rel == 0 && ver_patch != 0) {
499: if (file_printf(ms, ".%u", ver_patch) == -1)
500: return size;
501: } else if (ver_rel != 0) {
502: while (ver_rel > 26) {
503: if (file_printf(ms, "Z") == -1)
504: return size;
505: ver_rel -= 26;
506: }
507: if (file_printf(ms, "%c", 'A' + ver_rel - 1)
508: == -1)
509: return size;
510: }
511: }
512: *flags |= FLAGS_DID_NOTE;
513: return size;
514: }
515:
516: if (namesz == 8 && strcmp((char *)&nbuf[noff], "FreeBSD") == 0 &&
517: xnh_type == NT_FREEBSD_VERSION && descsz == 4) {
518: uint32_t desc;
519: (void)memcpy(&desc, &nbuf[doff], sizeof(desc));
520: desc = elf_getu32(swap, desc);
521: if (file_printf(ms, ", for FreeBSD") == -1)
522: return size;
523:
524: /*
525: * Contents is __FreeBSD_version, whose relation to OS
526: * versions is defined by a huge table in the Porter's
527: * Handbook. This is the general scheme:
528: *
529: * Releases:
530: * Mmp000 (before 4.10)
531: * Mmi0p0 (before 5.0)
532: * Mmm0p0
533: *
534: * Development branches:
535: * Mmpxxx (before 4.6)
536: * Mmp1xx (before 4.10)
537: * Mmi1xx (before 5.0)
538: * M000xx (pre-M.0)
539: * Mmm1xx
540: *
541: * M = major version
542: * m = minor version
543: * i = minor version increment (491000 -> 4.10)
544: * p = patchlevel
545: * x = revision
546: *
547: * The first release of FreeBSD to use ELF by default
548: * was version 3.0.
549: */
550: if (desc == 460002) {
551: if (file_printf(ms, " 4.6.2") == -1)
552: return size;
553: } else if (desc < 460100) {
554: if (file_printf(ms, " %d.%d", desc / 100000,
555: desc / 10000 % 10) == -1)
556: return size;
557: if (desc / 1000 % 10 > 0)
558: if (file_printf(ms, ".%d", desc / 1000 % 10)
559: == -1)
560: return size;
561: if ((desc % 1000 > 0) || (desc % 100000 == 0))
562: if (file_printf(ms, " (%d)", desc) == -1)
563: return size;
564: } else if (desc < 500000) {
565: if (file_printf(ms, " %d.%d", desc / 100000,
566: desc / 10000 % 10 + desc / 1000 % 10) == -1)
567: return size;
568: if (desc / 100 % 10 > 0) {
569: if (file_printf(ms, " (%d)", desc) == -1)
570: return size;
571: } else if (desc / 10 % 10 > 0) {
572: if (file_printf(ms, ".%d", desc / 10 % 10)
573: == -1)
574: return size;
575: }
576: } else {
577: if (file_printf(ms, " %d.%d", desc / 100000,
578: desc / 1000 % 100) == -1)
579: return size;
580: if ((desc / 100 % 10 > 0) ||
581: (desc % 100000 / 100 == 0)) {
582: if (file_printf(ms, " (%d)", desc) == -1)
583: return size;
584: } else if (desc / 10 % 10 > 0) {
585: if (file_printf(ms, ".%d", desc / 10 % 10)
586: == -1)
587: return size;
588: }
589: }
590: *flags |= FLAGS_DID_NOTE;
591: return size;
592: }
593:
594: if (namesz == 8 && strcmp((char *)&nbuf[noff], "OpenBSD") == 0 &&
595: xnh_type == NT_OPENBSD_VERSION && descsz == 4) {
596: if (file_printf(ms, ", for OpenBSD") == -1)
597: return size;
598: /* Content of note is always 0 */
599: *flags |= FLAGS_DID_NOTE;
600: return size;
601: }
602:
603: if (namesz == 10 && strcmp((char *)&nbuf[noff], "DragonFly") == 0 &&
604: xnh_type == NT_DRAGONFLY_VERSION && descsz == 4) {
605: uint32_t desc;
606: if (file_printf(ms, ", for DragonFly") == -1)
607: return size;
608: (void)memcpy(&desc, &nbuf[doff], sizeof(desc));
609: desc = elf_getu32(swap, desc);
610: if (file_printf(ms, " %d.%d.%d", desc / 100000,
611: desc / 10000 % 10, desc % 10000) == -1)
612: return size;
613: *flags |= FLAGS_DID_NOTE;
614: return size;
615: }
616:
617: core:
618: /*
619: * Sigh. The 2.0.36 kernel in Debian 2.1, at
620: * least, doesn't correctly implement name
621: * sections, in core dumps, as specified by
622: * the "Program Linking" section of "UNIX(R) System
623: * V Release 4 Programmer's Guide: ANSI C and
624: * Programming Support Tools", because my copy
625: * clearly says "The first 'namesz' bytes in 'name'
626: * contain a *null-terminated* [emphasis mine]
627: * character representation of the entry's owner
628: * or originator", but the 2.0.36 kernel code
629: * doesn't include the terminating null in the
630: * name....
631: */
632: if ((namesz == 4 && strncmp((char *)&nbuf[noff], "CORE", 4) == 0) ||
633: (namesz == 5 && strcmp((char *)&nbuf[noff], "CORE") == 0)) {
634: os_style = OS_STYLE_SVR4;
635: }
636:
637: if ((namesz == 8 && strcmp((char *)&nbuf[noff], "FreeBSD") == 0)) {
638: os_style = OS_STYLE_FREEBSD;
639: }
640:
641: if ((namesz >= 11 && strncmp((char *)&nbuf[noff], "NetBSD-CORE", 11)
642: == 0)) {
643: os_style = OS_STYLE_NETBSD;
644: }
645:
646: #ifdef ELFCORE
647: if ((*flags & FLAGS_DID_CORE) != 0)
648: return size;
649:
650: if (os_style != -1 && (*flags & FLAGS_DID_CORE_STYLE) == 0) {
651: if (file_printf(ms, ", %s-style", os_style_names[os_style])
652: == -1)
653: return size;
654: *flags |= FLAGS_DID_CORE_STYLE;
655: }
656:
657: switch (os_style) {
658: case OS_STYLE_NETBSD:
659: if (xnh_type == NT_NETBSD_CORE_PROCINFO) {
660: uint32_t signo;
661: /*
662: * Extract the program name. It is at
663: * offset 0x7c, and is up to 32-bytes,
664: * including the terminating NUL.
665: */
666: if (file_printf(ms, ", from '%.31s'",
667: &nbuf[doff + 0x7c]) == -1)
668: return size;
669:
670: /*
671: * Extract the signal number. It is at
672: * offset 0x08.
673: */
674: (void)memcpy(&signo, &nbuf[doff + 0x08],
675: sizeof(signo));
676: if (file_printf(ms, " (signal %u)",
677: elf_getu32(swap, signo)) == -1)
678: return size;
679: *flags |= FLAGS_DID_CORE;
680: return size;
681: }
682: break;
683:
684: default:
1.1.1.2 ! misho 685: if (xnh_type == NT_PRPSINFO && *flags & FLAGS_IS_CORE) {
1.1 misho 686: size_t i, j;
687: unsigned char c;
688: /*
689: * Extract the program name. We assume
690: * it to be 16 characters (that's what it
691: * is in SunOS 5.x and Linux).
692: *
693: * Unfortunately, it's at a different offset
694: * in various OSes, so try multiple offsets.
695: * If the characters aren't all printable,
696: * reject it.
697: */
698: for (i = 0; i < NOFFSETS; i++) {
699: unsigned char *cname, *cp;
700: size_t reloffset = prpsoffsets(i);
701: size_t noffset = doff + reloffset;
1.1.1.2 ! misho 702: size_t k;
1.1 misho 703: for (j = 0; j < 16; j++, noffset++,
704: reloffset++) {
705: /*
706: * Make sure we're not past
707: * the end of the buffer; if
708: * we are, just give up.
709: */
710: if (noffset >= size)
711: goto tryanother;
712:
713: /*
714: * Make sure we're not past
715: * the end of the contents;
716: * if we are, this obviously
717: * isn't the right offset.
718: */
719: if (reloffset >= descsz)
720: goto tryanother;
721:
722: c = nbuf[noffset];
723: if (c == '\0') {
724: /*
725: * A '\0' at the
726: * beginning is
727: * obviously wrong.
728: * Any other '\0'
729: * means we're done.
730: */
731: if (j == 0)
732: goto tryanother;
733: else
734: break;
735: } else {
736: /*
737: * A nonprintable
738: * character is also
739: * wrong.
740: */
741: if (!isprint(c) || isquote(c))
742: goto tryanother;
743: }
744: }
745: /*
746: * Well, that worked.
747: */
1.1.1.2 ! misho 748:
! 749: /*
! 750: * Try next offsets, in case this match is
! 751: * in the middle of a string.
! 752: */
! 753: for (k = i + 1 ; k < NOFFSETS ; k++) {
! 754: size_t no;
! 755: int adjust = 1;
! 756: if (prpsoffsets(k) >= prpsoffsets(i))
! 757: continue;
! 758: for (no = doff + prpsoffsets(k);
! 759: no < doff + prpsoffsets(i); no++)
! 760: adjust = adjust
! 761: && isprint(nbuf[no]);
! 762: if (adjust)
! 763: i = k;
! 764: }
! 765:
1.1 misho 766: cname = (unsigned char *)
767: &nbuf[doff + prpsoffsets(i)];
768: for (cp = cname; *cp && isprint(*cp); cp++)
769: continue;
770: /*
771: * Linux apparently appends a space at the end
772: * of the command line: remove it.
773: */
774: while (cp > cname && isspace(cp[-1]))
775: cp--;
776: if (file_printf(ms, ", from '%.*s'",
777: (int)(cp - cname), cname) == -1)
778: return size;
779: *flags |= FLAGS_DID_CORE;
780: return size;
781:
782: tryanother:
783: ;
784: }
785: }
786: break;
787: }
788: #endif
789: return offset;
790: }
791:
792: /* SunOS 5.x hardware capability descriptions */
793: typedef struct cap_desc {
794: uint64_t cd_mask;
795: const char *cd_name;
796: } cap_desc_t;
797:
798: static const cap_desc_t cap_desc_sparc[] = {
799: { AV_SPARC_MUL32, "MUL32" },
800: { AV_SPARC_DIV32, "DIV32" },
801: { AV_SPARC_FSMULD, "FSMULD" },
802: { AV_SPARC_V8PLUS, "V8PLUS" },
803: { AV_SPARC_POPC, "POPC" },
804: { AV_SPARC_VIS, "VIS" },
805: { AV_SPARC_VIS2, "VIS2" },
806: { AV_SPARC_ASI_BLK_INIT, "ASI_BLK_INIT" },
807: { AV_SPARC_FMAF, "FMAF" },
808: { AV_SPARC_FJFMAU, "FJFMAU" },
809: { AV_SPARC_IMA, "IMA" },
810: { 0, NULL }
811: };
812:
813: static const cap_desc_t cap_desc_386[] = {
814: { AV_386_FPU, "FPU" },
815: { AV_386_TSC, "TSC" },
816: { AV_386_CX8, "CX8" },
817: { AV_386_SEP, "SEP" },
818: { AV_386_AMD_SYSC, "AMD_SYSC" },
819: { AV_386_CMOV, "CMOV" },
820: { AV_386_MMX, "MMX" },
821: { AV_386_AMD_MMX, "AMD_MMX" },
822: { AV_386_AMD_3DNow, "AMD_3DNow" },
823: { AV_386_AMD_3DNowx, "AMD_3DNowx" },
824: { AV_386_FXSR, "FXSR" },
825: { AV_386_SSE, "SSE" },
826: { AV_386_SSE2, "SSE2" },
827: { AV_386_PAUSE, "PAUSE" },
828: { AV_386_SSE3, "SSE3" },
829: { AV_386_MON, "MON" },
830: { AV_386_CX16, "CX16" },
831: { AV_386_AHF, "AHF" },
832: { AV_386_TSCP, "TSCP" },
833: { AV_386_AMD_SSE4A, "AMD_SSE4A" },
834: { AV_386_POPCNT, "POPCNT" },
835: { AV_386_AMD_LZCNT, "AMD_LZCNT" },
836: { AV_386_SSSE3, "SSSE3" },
837: { AV_386_SSE4_1, "SSE4.1" },
838: { AV_386_SSE4_2, "SSE4.2" },
839: { 0, NULL }
840: };
841:
842: private int
843: doshn(struct magic_set *ms, int clazz, int swap, int fd, off_t off, int num,
1.1.1.2 ! misho 844: size_t size, off_t fsize, int *flags, int mach)
1.1 misho 845: {
846: Elf32_Shdr sh32;
847: Elf64_Shdr sh64;
848: int stripped = 1;
849: void *nbuf;
1.1.1.2 ! misho 850: off_t noff, coff;
1.1 misho 851: uint64_t cap_hw1 = 0; /* SunOS 5.x hardware capabilites */
852: uint64_t cap_sf1 = 0; /* SunOS 5.x software capabilites */
853:
854: if (size != xsh_sizeof) {
855: if (file_printf(ms, ", corrupted section header size") == -1)
856: return -1;
857: return 0;
858: }
859:
860: for ( ; num; num--) {
1.1.1.2 ! misho 861: if (FINFO_LSEEK_FUNC(fd, off, SEEK_SET) == (off_t)-1) {
! 862: file_badseek(ms);
! 863: return -1;
! 864: }
! 865: if (FINFO_READ_FUNC(fd, xsh_addr, xsh_sizeof) == -1) {
1.1 misho 866: file_badread(ms);
867: return -1;
868: }
1.1.1.2 ! misho 869: off += size;
! 870:
! 871: /* Things we can determine before we seek */
1.1 misho 872: switch (xsh_type) {
873: case SHT_SYMTAB:
874: #if 0
875: case SHT_DYNSYM:
876: #endif
877: stripped = 0;
878: break;
1.1.1.2 ! misho 879: default:
! 880: if (xsh_offset > fsize) {
! 881: /* Perhaps warn here */
! 882: continue;
1.1 misho 883: }
1.1.1.2 ! misho 884: break;
! 885: }
! 886:
! 887: /* Things we can determine when we seek */
! 888: switch (xsh_type) {
! 889: case SHT_NOTE:
1.1 misho 890: nbuf = emalloc((size_t)xsh_size);
1.1.1.2 ! misho 891: if ((noff = FINFO_LSEEK_FUNC(fd, (off_t)xsh_offset, SEEK_SET)) ==
1.1 misho 892: (off_t)-1) {
893: file_badread(ms);
894: efree(nbuf);
895: return -1;
896: }
1.1.1.2 ! misho 897: if (FINFO_READ_FUNC(fd, nbuf, (size_t)xsh_size) !=
1.1 misho 898: (ssize_t)xsh_size) {
899: efree(nbuf);
900: file_badread(ms);
901: return -1;
902: }
903:
904: noff = 0;
905: for (;;) {
906: if (noff >= (off_t)xsh_size)
907: break;
908: noff = donote(ms, nbuf, (size_t)noff,
909: (size_t)xsh_size, clazz, swap, 4,
910: flags);
911: if (noff == 0)
912: break;
913: }
914: efree(nbuf);
915: break;
916: case SHT_SUNW_cap:
1.1.1.2 ! misho 917: if (FINFO_LSEEK_FUNC(fd, (off_t)xsh_offset, SEEK_SET) ==
1.1 misho 918: (off_t)-1) {
1.1.1.2 ! misho 919: file_badseek(ms);
1.1 misho 920: return -1;
921: }
922: coff = 0;
923: for (;;) {
924: Elf32_Cap cap32;
925: Elf64_Cap cap64;
926: char cbuf[/*CONSTCOND*/
927: MAX(sizeof cap32, sizeof cap64)];
1.1.1.2 ! misho 928: if ((coff += xcap_sizeof) > (off_t)xsh_size)
1.1 misho 929: break;
1.1.1.2 ! misho 930: if (FINFO_READ_FUNC(fd, cbuf, (size_t)xcap_sizeof) !=
1.1 misho 931: (ssize_t)xcap_sizeof) {
932: file_badread(ms);
933: return -1;
934: }
935: (void)memcpy(xcap_addr, cbuf, xcap_sizeof);
936: switch (xcap_tag) {
937: case CA_SUNW_NULL:
938: break;
939: case CA_SUNW_HW_1:
940: cap_hw1 |= xcap_val;
941: break;
942: case CA_SUNW_SF_1:
943: cap_sf1 |= xcap_val;
944: break;
945: default:
946: if (file_printf(ms,
947: ", with unknown capability "
1.1.1.2 ! misho 948: "0x%" INT64_T_FORMAT "x = 0x%"
! 949: INT64_T_FORMAT "x",
1.1 misho 950: (unsigned long long)xcap_tag,
951: (unsigned long long)xcap_val) == -1)
952: return -1;
953: break;
954: }
955: }
956: break;
1.1.1.2 ! misho 957:
! 958: default:
! 959: break;
1.1 misho 960: }
961: }
962: if (file_printf(ms, ", %sstripped", stripped ? "" : "not ") == -1)
963: return -1;
964: if (cap_hw1) {
965: const cap_desc_t *cdp;
966: switch (mach) {
967: case EM_SPARC:
968: case EM_SPARC32PLUS:
969: case EM_SPARCV9:
970: cdp = cap_desc_sparc;
971: break;
972: case EM_386:
973: case EM_IA_64:
974: case EM_AMD64:
975: cdp = cap_desc_386;
976: break;
977: default:
978: cdp = NULL;
979: break;
980: }
981: if (file_printf(ms, ", uses") == -1)
982: return -1;
983: if (cdp) {
984: while (cdp->cd_name) {
985: if (cap_hw1 & cdp->cd_mask) {
986: if (file_printf(ms,
987: " %s", cdp->cd_name) == -1)
988: return -1;
989: cap_hw1 &= ~cdp->cd_mask;
990: }
991: ++cdp;
992: }
993: if (cap_hw1)
994: if (file_printf(ms,
1.1.1.2 ! misho 995: " unknown hardware capability 0x%"
! 996: INT64_T_FORMAT "x",
1.1 misho 997: (unsigned long long)cap_hw1) == -1)
998: return -1;
999: } else {
1000: if (file_printf(ms,
1.1.1.2 ! misho 1001: " hardware capability 0x%" INT64_T_FORMAT "x",
1.1 misho 1002: (unsigned long long)cap_hw1) == -1)
1003: return -1;
1004: }
1005: }
1006: if (cap_sf1) {
1007: if (cap_sf1 & SF1_SUNW_FPUSED) {
1008: if (file_printf(ms,
1009: (cap_sf1 & SF1_SUNW_FPKNWN)
1010: ? ", uses frame pointer"
1011: : ", not known to use frame pointer") == -1)
1012: return -1;
1013: }
1014: cap_sf1 &= ~SF1_SUNW_MASK;
1015: if (cap_sf1)
1016: if (file_printf(ms,
1.1.1.2 ! misho 1017: ", with unknown software capability 0x%"
! 1018: INT64_T_FORMAT "x",
1.1 misho 1019: (unsigned long long)cap_sf1) == -1)
1020: return -1;
1021: }
1022: return 0;
1023: }
1024:
1025: /*
1026: * Look through the program headers of an executable image, searching
1027: * for a PT_INTERP section; if one is found, it's dynamically linked,
1028: * otherwise it's statically linked.
1029: */
1030: private int
1031: dophn_exec(struct magic_set *ms, int clazz, int swap, int fd, off_t off,
1032: int num, size_t size, off_t fsize, int *flags, int sh_num)
1033: {
1034: Elf32_Phdr ph32;
1035: Elf64_Phdr ph64;
1036: const char *linking_style = "statically";
1037: const char *shared_libraries = "";
1038: unsigned char nbuf[BUFSIZ];
1.1.1.2 ! misho 1039: ssize_t bufsize;
1.1 misho 1040: size_t offset, align;
1041:
1042: if (size != xph_sizeof) {
1043: if (file_printf(ms, ", corrupted program header size") == -1)
1044: return -1;
1045: return 0;
1046: }
1047:
1048: for ( ; num; num--) {
1.1.1.2 ! misho 1049: if (FINFO_LSEEK_FUNC(fd, off, SEEK_SET) == (off_t)-1) {
! 1050: file_badseek(ms);
1.1 misho 1051: return -1;
1052: }
1053:
1.1.1.2 ! misho 1054: if (FINFO_READ_FUNC(fd, xph_addr, xph_sizeof) == -1) {
! 1055: file_badread(ms);
1.1 misho 1056: return -1;
1057: }
1058:
1.1.1.2 ! misho 1059: off += size;
1.1 misho 1060:
1.1.1.2 ! misho 1061: /* Things we can determine before we seek */
1.1 misho 1062: switch (xph_type) {
1063: case PT_DYNAMIC:
1064: linking_style = "dynamically";
1065: break;
1066: case PT_INTERP:
1067: shared_libraries = " (uses shared libs)";
1068: break;
1.1.1.2 ! misho 1069: default:
! 1070: if (xph_offset > fsize) {
! 1071: /* Maybe warn here? */
! 1072: continue;
! 1073: }
! 1074: break;
! 1075: }
! 1076:
! 1077: /* Things we can determine when we seek */
! 1078: switch (xph_type) {
1.1 misho 1079: case PT_NOTE:
1.1.1.2 ! misho 1080: if ((align = xph_align) & 0x80000000UL) {
1.1 misho 1081: if (file_printf(ms,
1082: ", invalid note alignment 0x%lx",
1083: (unsigned long)align) == -1)
1084: return -1;
1085: align = 4;
1086: }
1087: if (sh_num)
1088: break;
1089: /*
1090: * This is a PT_NOTE section; loop through all the notes
1091: * in the section.
1092: */
1.1.1.2 ! misho 1093: if (FINFO_LSEEK_FUNC(fd, xph_offset, SEEK_SET) == (off_t)-1) {
1.1 misho 1094: file_badseek(ms);
1095: return -1;
1096: }
1.1.1.2 ! misho 1097: bufsize = FINFO_READ_FUNC(fd, nbuf, ((xph_filesz < sizeof(nbuf)) ?
1.1 misho 1098: xph_filesz : sizeof(nbuf)));
1099: if (bufsize == -1) {
1100: file_badread(ms);
1101: return -1;
1102: }
1103: offset = 0;
1104: for (;;) {
1105: if (offset >= (size_t)bufsize)
1106: break;
1107: offset = donote(ms, nbuf, offset,
1108: (size_t)bufsize, clazz, swap, align,
1109: flags);
1110: if (offset == 0)
1111: break;
1112: }
1113: break;
1114: default:
1115: break;
1116: }
1117: }
1118: if (file_printf(ms, ", %s linked%s", linking_style, shared_libraries)
1119: == -1)
1120: return -1;
1121: return 0;
1122: }
1123:
1124:
1125: protected int
1126: file_tryelf(struct magic_set *ms, int fd, const unsigned char *buf,
1127: size_t nbytes)
1128: {
1129: union {
1130: int32_t l;
1131: char c[sizeof (int32_t)];
1132: } u;
1133: int clazz;
1134: int swap;
1135: struct stat st;
1136: off_t fsize;
1137: int flags = 0;
1138: Elf32_Ehdr elf32hdr;
1139: Elf64_Ehdr elf64hdr;
1140: uint16_t type;
1141:
1142: if (ms->flags & (MAGIC_MIME|MAGIC_APPLE))
1143: return 0;
1144: /*
1145: * ELF executables have multiple section headers in arbitrary
1146: * file locations and thus file(1) cannot determine it from easily.
1147: * Instead we traverse thru all section headers until a symbol table
1148: * one is found or else the binary is stripped.
1149: * Return immediately if it's not ELF (so we avoid pipe2file unless needed).
1150: */
1151: if (buf[EI_MAG0] != ELFMAG0
1152: || (buf[EI_MAG1] != ELFMAG1 && buf[EI_MAG1] != OLFMAG1)
1153: || buf[EI_MAG2] != ELFMAG2 || buf[EI_MAG3] != ELFMAG3)
1154: return 0;
1155:
1156: /*
1157: * If we cannot seek, it must be a pipe, socket or fifo.
1158: */
1.1.1.2 ! misho 1159: if((FINFO_LSEEK_FUNC(fd, (off_t)0, SEEK_SET) == (off_t)-1) && (errno == ESPIPE))
1.1 misho 1160: fd = file_pipe2file(ms, fd, buf, nbytes);
1161:
1162: if (fstat(fd, &st) == -1) {
1163: file_badread(ms);
1164: return -1;
1165: }
1166: fsize = st.st_size;
1167:
1168: clazz = buf[EI_CLASS];
1169:
1170: switch (clazz) {
1171: case ELFCLASS32:
1172: #undef elf_getu
1173: #define elf_getu(a, b) elf_getu32(a, b)
1174: #undef elfhdr
1175: #define elfhdr elf32hdr
1176: #include "elfclass.h"
1177: case ELFCLASS64:
1178: #undef elf_getu
1179: #define elf_getu(a, b) elf_getu64(a, b)
1180: #undef elfhdr
1181: #define elfhdr elf64hdr
1182: #include "elfclass.h"
1183: default:
1184: if (file_printf(ms, ", unknown class %d", clazz) == -1)
1185: return -1;
1186: break;
1187: }
1188: return 0;
1189: }
1190: #endif
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