| | 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 | #ifdef BUILTIN_ELF |
| | 30 | #include <string.h> |
| | 31 | #include <ctype.h> |
| | 32 | #include <stdlib.h> |
| | 33 | #ifdef HAVE_UNISTD_H |
| | 34 | #include <unistd.h> |
| | 35 | #endif |
| | 36 | |
| | 37 | #include "readelf.h" |
| | 38 | |
| | 39 | #ifndef lint |
| | 40 | FILE_RCSID("@(#)$Id: readelf.c,v 1.45 2004/11/24 17:38:24 christos Exp $") |
| | 41 | #endif |
| | 42 | |
| | 43 | #ifdef ELFCORE |
| | 44 | private int dophn_core(struct magic_set *, int, int, int, off_t, int, size_t); |
| | 45 | #endif |
| | 46 | private int dophn_exec(struct magic_set *, int, int, int, off_t, int, size_t); |
| | 47 | private int doshn(struct magic_set *, int, int, int, off_t, int, size_t); |
| | 48 | private size_t donote(struct magic_set *, unsigned char *, size_t, size_t, int, |
| | 49 | int, size_t); |
| | 50 | |
| | 51 | #define ELF_ALIGN(a) ((((a) + align - 1) / align) * align) |
| | 52 | |
| | 53 | private uint16_t getu16(int, uint16_t); |
| | 54 | private uint32_t getu32(int, uint32_t); |
| | 55 | private uint64_t getu64(int, uint64_t); |
| | 56 | |
| | 57 | private uint16_t |
| | 58 | getu16(int swap, uint16_t value) |
| | 59 | { |
| | 60 | union { |
| | 61 | uint16_t ui; |
| | 62 | char c[2]; |
| | 63 | } retval, tmpval; |
| | 64 | |
| | 65 | if (swap) { |
| | 66 | tmpval.ui = value; |
| | 67 | |
| | 68 | retval.c[0] = tmpval.c[1]; |
| | 69 | retval.c[1] = tmpval.c[0]; |
| | 70 | |
| | 71 | return retval.ui; |
| | 72 | } else |
| | 73 | return value; |
| | 74 | } |
| | 75 | |
| | 76 | private uint32_t |
| | 77 | getu32(int swap, uint32_t value) |
| | 78 | { |
| | 79 | union { |
| | 80 | uint32_t ui; |
| | 81 | char c[4]; |
| | 82 | } retval, tmpval; |
| | 83 | |
| | 84 | if (swap) { |
| | 85 | tmpval.ui = value; |
| | 86 | |
| | 87 | retval.c[0] = tmpval.c[3]; |
| | 88 | retval.c[1] = tmpval.c[2]; |
| | 89 | retval.c[2] = tmpval.c[1]; |
| | 90 | retval.c[3] = tmpval.c[0]; |
| | 91 | |
| | 92 | return retval.ui; |
| | 93 | } else |
| | 94 | return value; |
| | 95 | } |
| | 96 | |
| | 97 | private uint64_t |
| | 98 | getu64(int swap, uint64_t value) |
| | 99 | { |
| | 100 | union { |
| | 101 | uint64_t ui; |
| | 102 | char c[8]; |
| | 103 | } retval, tmpval; |
| | 104 | |
| | 105 | if (swap) { |
| | 106 | tmpval.ui = value; |
| | 107 | |
| | 108 | retval.c[0] = tmpval.c[7]; |
| | 109 | retval.c[1] = tmpval.c[6]; |
| | 110 | retval.c[2] = tmpval.c[5]; |
| | 111 | retval.c[3] = tmpval.c[4]; |
| | 112 | retval.c[4] = tmpval.c[3]; |
| | 113 | retval.c[5] = tmpval.c[2]; |
| | 114 | retval.c[6] = tmpval.c[1]; |
| | 115 | retval.c[7] = tmpval.c[0]; |
| | 116 | |
| | 117 | return retval.ui; |
| | 118 | } else |
| | 119 | return value; |
| | 120 | } |
| | 121 | |
| | 122 | #define sh_addr (class == ELFCLASS32 \ |
| | 123 | ? (void *) &sh32 \ |
| | 124 | : (void *) &sh64) |
| | 125 | #define sh_size (class == ELFCLASS32 \ |
| | 126 | ? sizeof sh32 \ |
| | 127 | : sizeof sh64) |
| | 128 | #define shs_type (class == ELFCLASS32 \ |
| | 129 | ? getu32(swap, sh32.sh_type) \ |
| | 130 | : getu32(swap, sh64.sh_type)) |
| | 131 | #define ph_addr (class == ELFCLASS32 \ |
| | 132 | ? (void *) &ph32 \ |
| | 133 | : (void *) &ph64) |
| | 134 | #define ph_size (class == ELFCLASS32 \ |
| | 135 | ? sizeof ph32 \ |
| | 136 | : sizeof ph64) |
| | 137 | #define ph_type (class == ELFCLASS32 \ |
| | 138 | ? getu32(swap, ph32.p_type) \ |
| | 139 | : getu32(swap, ph64.p_type)) |
| | 140 | #define ph_offset (class == ELFCLASS32 \ |
| | 141 | ? getu32(swap, ph32.p_offset) \ |
| | 142 | : getu64(swap, ph64.p_offset)) |
| | 143 | #define ph_align (size_t)((class == ELFCLASS32 \ |
| | 144 | ? (off_t) (ph32.p_align ? \ |
| | 145 | getu32(swap, ph32.p_align) : 4) \ |
| | 146 | : (off_t) (ph64.p_align ? \ |
| | 147 | getu64(swap, ph64.p_align) : 4))) |
| | 148 | #define ph_filesz (size_t)((class == ELFCLASS32 \ |
| | 149 | ? getu32(swap, ph32.p_filesz) \ |
| | 150 | : getu64(swap, ph64.p_filesz))) |
| | 151 | #define ph_memsz (size_t)((class == ELFCLASS32 \ |
| | 152 | ? getu32(swap, ph32.p_memsz) \ |
| | 153 | : getu64(swap, ph64.p_memsz))) |
| | 154 | #define nh_size (class == ELFCLASS32 \ |
| | 155 | ? sizeof nh32 \ |
| | 156 | : sizeof nh64) |
| | 157 | #define nh_type (class == ELFCLASS32 \ |
| | 158 | ? getu32(swap, nh32.n_type) \ |
| | 159 | : getu32(swap, nh64.n_type)) |
| | 160 | #define nh_namesz (class == ELFCLASS32 \ |
| | 161 | ? getu32(swap, nh32.n_namesz) \ |
| | 162 | : getu32(swap, nh64.n_namesz)) |
| | 163 | #define nh_descsz (class == ELFCLASS32 \ |
| | 164 | ? getu32(swap, nh32.n_descsz) \ |
| | 165 | : getu32(swap, nh64.n_descsz)) |
| | 166 | #define prpsoffsets(i) (class == ELFCLASS32 \ |
| | 167 | ? prpsoffsets32[i] \ |
| | 168 | : prpsoffsets64[i]) |
| | 169 | |
| | 170 | #ifdef ELFCORE |
| | 171 | size_t prpsoffsets32[] = { |
| | 172 | 8, /* FreeBSD */ |
| | 173 | 28, /* Linux 2.0.36 */ |
| | 174 | 32, /* Linux (I forget which kernel version) */ |
| | 175 | 84, /* SunOS 5.x */ |
| | 176 | }; |
| | 177 | |
| | 178 | size_t prpsoffsets64[] = { |
| | 179 | 120, /* SunOS 5.x, 64-bit */ |
| | 180 | }; |
| | 181 | |
| | 182 | #define NOFFSETS32 (sizeof prpsoffsets32 / sizeof prpsoffsets32[0]) |
| | 183 | #define NOFFSETS64 (sizeof prpsoffsets64 / sizeof prpsoffsets64[0]) |
| | 184 | |
| | 185 | #define NOFFSETS (class == ELFCLASS32 ? NOFFSETS32 : NOFFSETS64) |
| | 186 | |
| | 187 | /* |
| | 188 | * Look through the program headers of an executable image, searching |
| | 189 | * for a PT_NOTE section of type NT_PRPSINFO, with a name "CORE" or |
| | 190 | * "FreeBSD"; if one is found, try looking in various places in its |
| | 191 | * contents for a 16-character string containing only printable |
| | 192 | * characters - if found, that string should be the name of the program |
| | 193 | * that dropped core. Note: right after that 16-character string is, |
| | 194 | * at least in SunOS 5.x (and possibly other SVR4-flavored systems) and |
| | 195 | * Linux, a longer string (80 characters, in 5.x, probably other |
| | 196 | * SVR4-flavored systems, and Linux) containing the start of the |
| | 197 | * command line for that program. |
| | 198 | * |
| | 199 | * The signal number probably appears in a section of type NT_PRSTATUS, |
| | 200 | * but that's also rather OS-dependent, in ways that are harder to |
| | 201 | * dissect with heuristics, so I'm not bothering with the signal number. |
| | 202 | * (I suppose the signal number could be of interest in situations where |
| | 203 | * you don't have the binary of the program that dropped core; if you |
| | 204 | * *do* have that binary, the debugger will probably tell you what |
| | 205 | * signal it was.) |
| | 206 | */ |
| | 207 | |
| | 208 | #define OS_STYLE_SVR4 0 |
| | 209 | #define OS_STYLE_FREEBSD 1 |
| | 210 | #define OS_STYLE_NETBSD 2 |
| | 211 | |
| | 212 | private const char *os_style_names[] = { |
| | 213 | "SVR4", |
| | 214 | "FreeBSD", |
| | 215 | "NetBSD", |
| | 216 | }; |
| | 217 | |
| | 218 | private int |
| | 219 | dophn_core(struct magic_set *ms, int class, int swap, int fd, off_t off, |
| | 220 | int num, size_t size) |
| | 221 | { |
| | 222 | Elf32_Phdr ph32; |
| | 223 | Elf64_Phdr ph64; |
| | 224 | size_t offset; |
| | 225 | unsigned char nbuf[BUFSIZ]; |
| | 226 | ssize_t bufsize; |
| | 227 | |
| | 228 | if (size != ph_size) { |
| | 229 | if (file_printf(ms, ", corrupted program header size") == -1) |
| | 230 | return -1; |
| | 231 | return 0; |
| | 232 | } |
| | 233 | /* |
| | 234 | * Loop through all the program headers. |
| | 235 | */ |
| | 236 | for ( ; num; num--) { |
| | 237 | if (lseek(fd, off, SEEK_SET) == (off_t)-1) { |
| | 238 | file_badseek(ms); |
| | 239 | return -1; |
| | 240 | } |
| | 241 | if (read(fd, ph_addr, ph_size) == -1) { |
| | 242 | file_badread(ms); |
| | 243 | return -1; |
| | 244 | } |
| | 245 | off += size; |
| | 246 | if (ph_type != PT_NOTE) |
| | 247 | continue; |
| | 248 | |
| | 249 | /* |
| | 250 | * This is a PT_NOTE section; loop through all the notes |
| | 251 | * in the section. |
| | 252 | */ |
| | 253 | if (lseek(fd, (off_t) ph_offset, SEEK_SET) == (off_t)-1) { |
| | 254 | file_badseek(ms); |
| | 255 | return -1; |
| | 256 | } |
| | 257 | bufsize = read(fd, nbuf, |
| | 258 | ((ph_filesz < sizeof(nbuf)) ? ph_filesz : sizeof(nbuf))); |
| | 259 | if (bufsize == -1) { |
| | 260 | file_badread(ms); |
| | 261 | return -1; |
| | 262 | } |
| | 263 | offset = 0; |
| | 264 | for (;;) { |
| | 265 | if (offset >= (size_t)bufsize) |
| | 266 | break; |
| | 267 | offset = donote(ms, nbuf, offset, (size_t)bufsize, |
| | 268 | class, swap, 4); |
| | 269 | if (offset == 0) |
| | 270 | break; |
| | 271 | |
| | 272 | } |
| | 273 | } |
| | 274 | return 0; |
| | 275 | } |
| | 276 | #endif |
| | 277 | |
| | 278 | private size_t |
| | 279 | donote(struct magic_set *ms, unsigned char *nbuf, size_t offset, size_t size, |
| | 280 | int class, int swap, size_t align) |
| | 281 | { |
| | 282 | Elf32_Nhdr nh32; |
| | 283 | Elf64_Nhdr nh64; |
| | 284 | size_t noff, doff; |
| | 285 | #ifdef ELFCORE |
| | 286 | int os_style = -1; |
| | 287 | #endif |
| | 288 | uint32_t namesz, descsz; |
| | 289 | |
| | 290 | if (class == ELFCLASS32) |
| | 291 | memcpy(&nh32, &nbuf[offset], sizeof(nh32)); |
| | 292 | else |
| | 293 | memcpy(&nh64, &nbuf[offset], sizeof(nh64)); |
| | 294 | offset += nh_size; |
| | 295 | |
| | 296 | namesz = nh_namesz; |
| | 297 | descsz = nh_descsz; |
| | 298 | if ((namesz == 0) && (descsz == 0)) { |
| | 299 | /* |
| | 300 | * We're out of note headers. |
| | 301 | */ |
| | 302 | return offset; |
| | 303 | } |
| | 304 | |
| | 305 | if (namesz & 0x80000000) { |
| | 306 | (void)file_printf(ms, ", bad note name size 0x%lx", |
| | 307 | (unsigned long)namesz); |
| | 308 | return offset; |
| | 309 | } |
| | 310 | |
| | 311 | if (descsz & 0x80000000) { |
| | 312 | (void)file_printf(ms, ", bad note description size 0x%lx", |
| | 313 | (unsigned long)descsz); |
| | 314 | return offset; |
| | 315 | } |
| | 316 | |
| | 317 | |
| | 318 | noff = offset; |
| | 319 | doff = ELF_ALIGN(offset + namesz); |
| | 320 | |
| | 321 | if (offset + namesz > size) { |
| | 322 | /* |
| | 323 | * We're past the end of the buffer. |
| | 324 | */ |
| | 325 | return doff; |
| | 326 | } |
| | 327 | |
| | 328 | offset = ELF_ALIGN(doff + descsz); |
| | 329 | if (doff + descsz > size) { |
| | 330 | return offset; |
| | 331 | } |
| | 332 | |
| | 333 | if (namesz == 4 && strcmp((char *)&nbuf[noff], "GNU") == 0 && |
| | 334 | nh_type == NT_GNU_VERSION && descsz == 16) { |
| | 335 | uint32_t desc[4]; |
| | 336 | (void)memcpy(desc, &nbuf[doff], sizeof(desc)); |
| | 337 | |
| | 338 | if (file_printf(ms, ", for GNU/") == -1) |
| | 339 | return size; |
| | 340 | switch (getu32(swap, desc[0])) { |
| | 341 | case GNU_OS_LINUX: |
| | 342 | if (file_printf(ms, "Linux") == -1) |
| | 343 | return size; |
| | 344 | break; |
| | 345 | case GNU_OS_HURD: |
| | 346 | if (file_printf(ms, "Hurd") == -1) |
| | 347 | return size; |
| | 348 | break; |
| | 349 | case GNU_OS_SOLARIS: |
| | 350 | if (file_printf(ms, "Solaris") == -1) |
| | 351 | return size; |
| | 352 | break; |
| | 353 | default: |
| | 354 | if (file_printf(ms, "<unknown>") == -1) |
| | 355 | return size; |
| | 356 | } |
| | 357 | if (file_printf(ms, " %d.%d.%d", getu32(swap, desc[1]), |
| | 358 | getu32(swap, desc[2]), getu32(swap, desc[3])) == -1) |
| | 359 | return size; |
| | 360 | return size; |
| | 361 | } |
| | 362 | |
| | 363 | if (namesz == 7 && strcmp((char *)&nbuf[noff], "NetBSD") == 0 && |
| | 364 | nh_type == NT_NETBSD_VERSION && descsz == 4) { |
| | 365 | uint32_t desc; |
| | 366 | (void)memcpy(&desc, &nbuf[doff], sizeof(desc)); |
| | 367 | desc = getu32(swap, desc); |
| | 368 | |
| | 369 | if (file_printf(ms, ", for NetBSD") == -1) |
| | 370 | return size; |
| | 371 | /* |
| | 372 | * The version number used to be stuck as 199905, and was thus |
| | 373 | * basically content-free. Newer versions of NetBSD have fixed |
| | 374 | * this and now use the encoding of __NetBSD_Version__: |
| | 375 | * |
| | 376 | * MMmmrrpp00 |
| | 377 | * |
| | 378 | * M = major version |
| | 379 | * m = minor version |
| | 380 | * r = release ["",A-Z,Z[A-Z] but numeric] |
| | 381 | * p = patchlevel |
| | 382 | */ |
| | 383 | if (desc > 100000000U) { |
| | 384 | u_int ver_patch = (desc / 100) % 100; |
| | 385 | u_int ver_rel = (desc / 10000) % 100; |
| | 386 | u_int ver_min = (desc / 1000000) % 100; |
| | 387 | u_int ver_maj = desc / 100000000; |
| | 388 | |
| | 389 | if (file_printf(ms, " %u.%u", ver_maj, ver_min) == -1) |
| | 390 | return size; |
| | 391 | if (ver_rel == 0 && ver_patch != 0) { |
| | 392 | if (file_printf(ms, ".%u", ver_patch) == -1) |
| | 393 | return size; |
| | 394 | } else if (ver_rel != 0) { |
| | 395 | while (ver_rel > 26) { |
| | 396 | file_printf(ms, "Z"); |
| | 397 | ver_rel -= 26; |
| | 398 | } |
| | 399 | file_printf(ms, "%c", 'A' + ver_rel - 1); |
| | 400 | } |
| | 401 | } |
| | 402 | return size; |
| | 403 | } |
| | 404 | |
| | 405 | if (namesz == 8 && strcmp((char *)&nbuf[noff], "FreeBSD") == 0 && |
| | 406 | nh_type == NT_FREEBSD_VERSION && descsz == 4) { |
| | 407 | uint32_t desc; |
| | 408 | (void)memcpy(&desc, &nbuf[doff], sizeof(desc)); |
| | 409 | desc = getu32(swap, desc); |
| | 410 | if (file_printf(ms, ", for FreeBSD") == -1) |
| | 411 | return size; |
| | 412 | |
| | 413 | /* |
| | 414 | * Contents is __FreeBSD_version, whose relation to OS |
| | 415 | * versions is defined by a huge table in the Porter's |
| | 416 | * Handbook. This is the general scheme: |
| | 417 | * |
| | 418 | * Releases: |
| | 419 | * Mmp000 (before 4.10) |
| | 420 | * Mmi0p0 (before 5.0) |
| | 421 | * Mmm0p0 |
| | 422 | * |
| | 423 | * Development branches: |
| | 424 | * Mmpxxx (before 4.6) |
| | 425 | * Mmp1xx (before 4.10) |
| | 426 | * Mmi1xx (before 5.0) |
| | 427 | * M000xx (pre-M.0) |
| | 428 | * Mmm1xx |
| | 429 | * |
| | 430 | * M = major version |
| | 431 | * m = minor version |
| | 432 | * i = minor version increment (491000 -> 4.10) |
| | 433 | * p = patchlevel |
| | 434 | * x = revision |
| | 435 | * |
| | 436 | * The first release of FreeBSD to use ELF by default |
| | 437 | * was version 3.0. |
| | 438 | */ |
| | 439 | if (desc == 460002) { |
| | 440 | if (file_printf(ms, " 4.6.2") == -1) |
| | 441 | return size; |
| | 442 | } else if (desc < 460100) { |
| | 443 | if (file_printf(ms, " %d.%d", desc / 100000, |
| | 444 | desc / 10000 % 10) == -1) |
| | 445 | return size; |
| | 446 | if (desc / 1000 % 10 > 0) |
| | 447 | if (file_printf(ms, ".%d", desc / 1000 % 10) |
| | 448 | == -1) |
| | 449 | return size; |
| | 450 | if ((desc % 1000 > 0) || (desc % 100000 == 0)) |
| | 451 | if (file_printf(ms, " (%d)", desc) == -1) |
| | 452 | return size; |
| | 453 | } else if (desc < 500000) { |
| | 454 | if (file_printf(ms, " %d.%d", desc / 100000, |
| | 455 | desc / 10000 % 10 + desc / 1000 % 10) == -1) |
| | 456 | return size; |
| | 457 | if (desc / 100 % 10 > 0) { |
| | 458 | if (file_printf(ms, " (%d)", desc) == -1) |
| | 459 | return size; |
| | 460 | } else if (desc / 10 % 10 > 0) { |
| | 461 | if (file_printf(ms, ".%d", desc / 10 % 10) |
| | 462 | == -1) |
| | 463 | return size; |
| | 464 | } |
| | 465 | } else { |
| | 466 | if (file_printf(ms, " %d.%d", desc / 100000, |
| | 467 | desc / 1000 % 100) == -1) |
| | 468 | return size; |
| | 469 | if ((desc / 100 % 10 > 0) || |
| | 470 | (desc % 100000 / 100 == 0)) { |
| | 471 | if (file_printf(ms, " (%d)", desc) == -1) |
| | 472 | return size; |
| | 473 | } else if (desc / 10 % 10 > 0) { |
| | 474 | if (file_printf(ms, ".%d", desc / 10 % 10) |
| | 475 | == -1) |
| | 476 | return size; |
| | 477 | } |
| | 478 | } |
| | 479 | return size; |
| | 480 | } |
| | 481 | |
| | 482 | if (namesz == 8 && strcmp((char *)&nbuf[noff], "OpenBSD") == 0 && |
| | 483 | nh_type == NT_OPENBSD_VERSION && descsz == 4) { |
| | 484 | if (file_printf(ms, ", for OpenBSD") == -1) |
| | 485 | return size; |
| | 486 | /* Content of note is always 0 */ |
| | 487 | return size; |
| | 488 | } |
| | 489 | |
| | 490 | /* |
| | 491 | * Sigh. The 2.0.36 kernel in Debian 2.1, at |
| | 492 | * least, doesn't correctly implement name |
| | 493 | * sections, in core dumps, as specified by |
| | 494 | * the "Program Linking" section of "UNIX(R) System |
| | 495 | * V Release 4 Programmer's Guide: ANSI C and |
| | 496 | * Programming Support Tools", because my copy |
| | 497 | * clearly says "The first 'namesz' bytes in 'name' |
| | 498 | * contain a *null-terminated* [emphasis mine] |
| | 499 | * character representation of the entry's owner |
| | 500 | * or originator", but the 2.0.36 kernel code |
| | 501 | * doesn't include the terminating null in the |
| | 502 | * name.... |
| | 503 | */ |
| | 504 | if ((namesz == 4 && strncmp((char *)&nbuf[noff], "CORE", 4) == 0) || |
| | 505 | (namesz == 5 && strcmp((char *)&nbuf[noff], "CORE") == 0)) { |
| | 506 | os_style = OS_STYLE_SVR4; |
| | 507 | } |
| | 508 | |
| | 509 | if ((namesz == 8 && strcmp((char *)&nbuf[noff], "FreeBSD") == 0)) { |
| | 510 | os_style = OS_STYLE_FREEBSD; |
| | 511 | } |
| | 512 | |
| | 513 | if ((namesz >= 11 && strncmp((char *)&nbuf[noff], "NetBSD-CORE", 11) |
| | 514 | == 0)) { |
| | 515 | os_style = OS_STYLE_NETBSD; |
| | 516 | } |
| | 517 | |
| | 518 | #ifdef ELFCORE |
| | 519 | if (os_style != -1) |
| | 520 | if (file_printf(ms, ", %s-style", os_style_names[os_style]) == -1) |
| | 521 | return size; |
| | 522 | |
| | 523 | if (os_style == OS_STYLE_NETBSD && nh_type == NT_NETBSD_CORE_PROCINFO) { |
| | 524 | uint32_t signo; |
| | 525 | /* |
| | 526 | * Extract the program name. It is at |
| | 527 | * offset 0x7c, and is up to 32-bytes, |
| | 528 | * including the terminating NUL. |
| | 529 | */ |
| | 530 | if (file_printf(ms, ", from '%.31s'", &nbuf[doff + 0x7c]) == -1) |
| | 531 | return size; |
| | 532 | |
| | 533 | /* |
| | 534 | * Extract the signal number. It is at |
| | 535 | * offset 0x08. |
| | 536 | */ |
| | 537 | memcpy(&signo, &nbuf[doff + 0x08], |
| | 538 | sizeof(signo)); |
| | 539 | if (file_printf(ms, " (signal %u)", getu32(swap, signo)) == -1) |
| | 540 | return size; |
| | 541 | return size; |
| | 542 | } else if (os_style != OS_STYLE_NETBSD && nh_type == NT_PRPSINFO) { |
| | 543 | size_t i, j; |
| | 544 | unsigned char c; |
| | 545 | /* |
| | 546 | * Extract the program name. We assume |
| | 547 | * it to be 16 characters (that's what it |
| | 548 | * is in SunOS 5.x and Linux). |
| | 549 | * |
| | 550 | * Unfortunately, it's at a different offset |
| | 551 | * in varous OSes, so try multiple offsets. |
| | 552 | * If the characters aren't all printable, |
| | 553 | * reject it. |
| | 554 | */ |
| | 555 | for (i = 0; i < NOFFSETS; i++) { |
| | 556 | size_t reloffset = prpsoffsets(i); |
| | 557 | size_t noffset = doff + reloffset; |
| | 558 | for (j = 0; j < 16; j++, noffset++, reloffset++) { |
| | 559 | /* |
| | 560 | * Make sure we're not past |
| | 561 | * the end of the buffer; if |
| | 562 | * we are, just give up. |
| | 563 | */ |
| | 564 | if (noffset >= size) |
| | 565 | goto tryanother; |
| | 566 | |
| | 567 | /* |
| | 568 | * Make sure we're not past |
| | 569 | * the end of the contents; |
| | 570 | * if we are, this obviously |
| | 571 | * isn't the right offset. |
| | 572 | */ |
| | 573 | if (reloffset >= descsz) |
| | 574 | goto tryanother; |
| | 575 | |
| | 576 | c = nbuf[noffset]; |
| | 577 | if (c == '\0') { |
| | 578 | /* |
| | 579 | * A '\0' at the |
| | 580 | * beginning is |
| | 581 | * obviously wrong. |
| | 582 | * Any other '\0' |
| | 583 | * means we're done. |
| | 584 | */ |
| | 585 | if (j == 0) |
| | 586 | goto tryanother; |
| | 587 | else |
| | 588 | break; |
| | 589 | } else { |
| | 590 | /* |
| | 591 | * A nonprintable |
| | 592 | * character is also |
| | 593 | * wrong. |
| | 594 | */ |
| | 595 | #define isquote(c) (strchr("'\"`", (c)) != NULL) |
| | 596 | if (!isprint(c) || isquote(c)) |
| | 597 | goto tryanother; |
| | 598 | } |
| | 599 | } |
| | 600 | |
| | 601 | /* |
| | 602 | * Well, that worked. |
| | 603 | */ |
| | 604 | if (file_printf(ms, ", from '%.16s'", |
| | 605 | &nbuf[doff + prpsoffsets(i)]) == -1) |
| | 606 | return size; |
| | 607 | return size; |
| | 608 | |
| | 609 | tryanother: |
| | 610 | ; |
| | 611 | } |
| | 612 | return offset; |
| | 613 | } |
| | 614 | #endif |
| | 615 | return offset; |
| | 616 | } |
| | 617 | |
| | 618 | private int |
| | 619 | doshn(struct magic_set *ms, int class, int swap, int fd, off_t off, int num, |
| | 620 | size_t size) |
| | 621 | { |
| | 622 | Elf32_Shdr sh32; |
| | 623 | Elf64_Shdr sh64; |
| | 624 | |
| | 625 | if (size != sh_size) { |
| | 626 | if (file_printf(ms, ", corrupted section header size") == -1) |
| | 627 | return -1; |
| | 628 | return 0; |
| | 629 | } |
| | 630 | |
| | 631 | if (lseek(fd, off, SEEK_SET) == (off_t)-1) { |
| | 632 | file_badseek(ms); |
| | 633 | return -1; |
| | 634 | } |
| | 635 | |
| | 636 | for ( ; num; num--) { |
| | 637 | if (read(fd, sh_addr, sh_size) == -1) { |
| | 638 | file_badread(ms); |
| | 639 | return -1; |
| | 640 | } |
| | 641 | if (shs_type == SHT_SYMTAB /* || shs_type == SHT_DYNSYM */) { |
| | 642 | if (file_printf(ms, ", not stripped") == -1) |
| | 643 | return -1; |
| | 644 | return 0; |
| | 645 | } |
| | 646 | } |
| | 647 | if (file_printf(ms, ", stripped") == -1) |
| | 648 | return -1; |
| | 649 | return 0; |
| | 650 | } |
| | 651 | |
| | 652 | /* |
| | 653 | * Look through the program headers of an executable image, searching |
| | 654 | * for a PT_INTERP section; if one is found, it's dynamically linked, |
| | 655 | * otherwise it's statically linked. |
| | 656 | */ |
| | 657 | private int |
| | 658 | dophn_exec(struct magic_set *ms, int class, int swap, int fd, off_t off, |
| | 659 | int num, size_t size) |
| | 660 | { |
| | 661 | Elf32_Phdr ph32; |
| | 662 | Elf64_Phdr ph64; |
| | 663 | const char *linking_style = "statically"; |
| | 664 | const char *shared_libraries = ""; |
| | 665 | unsigned char nbuf[BUFSIZ]; |
| | 666 | int bufsize; |
| | 667 | size_t offset, align; |
| | 668 | off_t savedoffset; |
| | 669 | |
| | 670 | if (size != ph_size) { |
| | 671 | if (file_printf(ms, ", corrupted program header size") == -1) |
| | 672 | return -1; |
| | 673 | return 0; |
| | 674 | } |
| | 675 | if (lseek(fd, off, SEEK_SET) == (off_t)-1) { |
| | 676 | file_badseek(ms); |
| | 677 | return -1; |
| | 678 | } |
| | 679 | |
| | 680 | for ( ; num; num--) { |
| | 681 | if (read(fd, ph_addr, ph_size) == -1) { |
| | 682 | file_badread(ms); |
| | 683 | return -1; |
| | 684 | } |
| | 685 | if ((savedoffset = lseek(fd, (off_t)0, SEEK_CUR)) == (off_t)-1) { |
| | 686 | file_badseek(ms); |
| | 687 | return -1; |
| | 688 | } |
| | 689 | |
| | 690 | switch (ph_type) { |
| | 691 | case PT_DYNAMIC: |
| | 692 | linking_style = "dynamically"; |
| | 693 | break; |
| | 694 | case PT_INTERP: |
| | 695 | shared_libraries = " (uses shared libs)"; |
| | 696 | break; |
| | 697 | case PT_NOTE: |
| | 698 | if ((align = ph_align) & 0x80000000) { |
| | 699 | if (file_printf(ms, |
| | 700 | ", invalid note alignment 0x%lx", |
| | 701 | (unsigned long)align) == -1) |
| | 702 | return -1; |
| | 703 | align = 4; |
| | 704 | } |
| | 705 | /* |
| | 706 | * This is a PT_NOTE section; loop through all the notes |
| | 707 | * in the section. |
| | 708 | */ |
| | 709 | if (lseek(fd, (off_t) ph_offset, SEEK_SET) |
| | 710 | == (off_t)-1) { |
| | 711 | file_badseek(ms); |
| | 712 | return -1; |
| | 713 | } |
| | 714 | bufsize = read(fd, nbuf, ((ph_filesz < sizeof(nbuf)) ? |
| | 715 | ph_filesz : sizeof(nbuf))); |
| | 716 | if (bufsize == -1) { |
| | 717 | file_badread(ms); |
| | 718 | return -1; |
| | 719 | } |
| | 720 | offset = 0; |
| | 721 | for (;;) { |
| | 722 | if (offset >= (size_t)bufsize) |
| | 723 | break; |
| | 724 | offset = donote(ms, nbuf, offset, |
| | 725 | (size_t)bufsize, class, swap, align); |
| | 726 | if (offset == 0) |
| | 727 | break; |
| | 728 | } |
| | 729 | if (lseek(fd, savedoffset, SEEK_SET) == (off_t)-1) { |
| | 730 | file_badseek(ms); |
| | 731 | return -1; |
| | 732 | } |
| | 733 | break; |
| | 734 | } |
| | 735 | } |
| | 736 | if (file_printf(ms, ", %s linked%s", linking_style, shared_libraries) |
| | 737 | == -1) |
| | 738 | return -1; |
| | 739 | return 0; |
| | 740 | } |
| | 741 | |
| | 742 | |
| | 743 | protected int |
| | 744 | file_tryelf(struct magic_set *ms, int fd, const unsigned char *buf, |
| | 745 | size_t nbytes) |
| | 746 | { |
| | 747 | union { |
| | 748 | int32_t l; |
| | 749 | char c[sizeof (int32_t)]; |
| | 750 | } u; |
| | 751 | int class; |
| | 752 | int swap; |
| | 753 | |
| | 754 | /* |
| | 755 | * If we cannot seek, it must be a pipe, socket or fifo. |
| | 756 | */ |
| | 757 | if((lseek(fd, (off_t)0, SEEK_SET) == (off_t)-1) && (errno == ESPIPE)) |
| | 758 | fd = file_pipe2file(ms, fd, buf, nbytes); |
| | 759 | |
| | 760 | /* |
| | 761 | * ELF executables have multiple section headers in arbitrary |
| | 762 | * file locations and thus file(1) cannot determine it from easily. |
| | 763 | * Instead we traverse thru all section headers until a symbol table |
| | 764 | * one is found or else the binary is stripped. |
| | 765 | */ |
| | 766 | if (buf[EI_MAG0] != ELFMAG0 |
| | 767 | || (buf[EI_MAG1] != ELFMAG1 && buf[EI_MAG1] != OLFMAG1) |
| | 768 | || buf[EI_MAG2] != ELFMAG2 || buf[EI_MAG3] != ELFMAG3) |
| | 769 | return 0; |
| | 770 | |
| | 771 | |
| | 772 | class = buf[4]; |
| | 773 | |
| | 774 | if (class == ELFCLASS32) { |
| | 775 | Elf32_Ehdr elfhdr; |
| | 776 | if (nbytes <= sizeof (Elf32_Ehdr)) |
| | 777 | return 0; |
| | 778 | |
| | 779 | |
| | 780 | u.l = 1; |
| | 781 | (void) memcpy(&elfhdr, buf, sizeof elfhdr); |
| | 782 | swap = (u.c[sizeof(int32_t) - 1] + 1) != elfhdr.e_ident[5]; |
| | 783 | |
| | 784 | if (getu16(swap, elfhdr.e_type) == ET_CORE) { |
| | 785 | #ifdef ELFCORE |
| | 786 | if (dophn_core(ms, class, swap, fd, |
| | 787 | (off_t)getu32(swap, elfhdr.e_phoff), |
| | 788 | getu16(swap, elfhdr.e_phnum), |
| | 789 | (size_t)getu16(swap, elfhdr.e_phentsize)) == -1) |
| | 790 | return -1; |
| | 791 | #else |
| | 792 | ; |
| | 793 | #endif |
| | 794 | } else { |
| | 795 | if (getu16(swap, elfhdr.e_type) == ET_EXEC) { |
| | 796 | if (dophn_exec(ms, class, swap, |
| | 797 | fd, (off_t)getu32(swap, elfhdr.e_phoff), |
| | 798 | getu16(swap, elfhdr.e_phnum), |
| | 799 | (size_t)getu16(swap, elfhdr.e_phentsize)) |
| | 800 | == -1) |
| | 801 | return -1; |
| | 802 | } |
| | 803 | if (doshn(ms, class, swap, fd, |
| | 804 | (off_t)getu32(swap, elfhdr.e_shoff), |
| | 805 | getu16(swap, elfhdr.e_shnum), |
| | 806 | (size_t)getu16(swap, elfhdr.e_shentsize)) == -1) |
| | 807 | return -1; |
| | 808 | } |
| | 809 | return 1; |
| | 810 | } |
| | 811 | |
| | 812 | if (class == ELFCLASS64) { |
| | 813 | Elf64_Ehdr elfhdr; |
| | 814 | if (nbytes <= sizeof (Elf64_Ehdr)) |
| | 815 | return 0; |
| | 816 | |
| | 817 | |
| | 818 | u.l = 1; |
| | 819 | (void) memcpy(&elfhdr, buf, sizeof elfhdr); |
| | 820 | swap = (u.c[sizeof(int32_t) - 1] + 1) != elfhdr.e_ident[5]; |
| | 821 | |
| | 822 | if (getu16(swap, elfhdr.e_type) == ET_CORE) { |
| | 823 | #ifdef ELFCORE |
| | 824 | if (dophn_core(ms, class, swap, fd, |
| | 825 | #ifdef USE_ARRAY_FOR_64BIT_TYPES |
| | 826 | (off_t)getu32(swap, elfhdr.e_phoff[1]), |
| | 827 | #else |
| | 828 | (off_t)getu64(swap, elfhdr.e_phoff), |
| | 829 | #endif |
| | 830 | getu16(swap, elfhdr.e_phnum), |
| | 831 | (size_t)getu16(swap, elfhdr.e_phentsize)) == -1) |
| | 832 | return -1; |
| | 833 | #else |
| | 834 | ; |
| | 835 | #endif |
| | 836 | } else { |
| | 837 | if (getu16(swap, elfhdr.e_type) == ET_EXEC) { |
| | 838 | if (dophn_exec(ms, class, swap, fd, |
| | 839 | #ifdef USE_ARRAY_FOR_64BIT_TYPES |
| | 840 | (off_t)getu32(swap, elfhdr.e_phoff[1]), |
| | 841 | #else |
| | 842 | (off_t)getu64(swap, elfhdr.e_phoff), |
| | 843 | #endif |
| | 844 | getu16(swap, elfhdr.e_phnum), |
| | 845 | (size_t)getu16(swap, elfhdr.e_phentsize)) |
| | 846 | == -1) |
| | 847 | return -1; |
| | 848 | } |
| | 849 | if (doshn(ms, class, swap, fd, |
| | 850 | #ifdef USE_ARRAY_FOR_64BIT_TYPES |
| | 851 | (off_t)getu32(swap, elfhdr.e_shoff[1]), |
| | 852 | #else |
| | 853 | (off_t)getu64(swap, elfhdr.e_shoff), |
| | 854 | #endif |
| | 855 | getu16(swap, elfhdr.e_shnum), |
| | 856 | (size_t)getu16(swap, elfhdr.e_shentsize)) == -1) |
| | 857 | return -1; |
| | 858 | } |
| | 859 | return 1; |
| | 860 | } |
| | 861 | return 0; |
| | 862 | } |
| | 863 | #endif |
projects / dragonfly.git / blame_incremental