Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
FreeBSD/Linux Kernel Cross Reference
sys/kern/imgact_elf.c
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
SearchContext: - none - 3 - 10
1 /*- 2 * Copyright (c) 2017 Dell EMC 3 * Copyright (c) 2000 David O'Brien 4 * Copyright (c) 1995-1996 Søren Schmidt 5 * Copyright (c) 1996 Peter Wemm 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer 13 * in this position and unchanged. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. The name of the author may not be used to endorse or promote products 18 * derived from this software without specific prior written permission 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __FBSDID("$FreeBSD$"); 34 35 #include "opt_capsicum.h" 36 #include "opt_compat.h" 37 #include "opt_gzio.h" 38 39 #include <sys/param.h> 40 #include <sys/capsicum.h> 41 #include <sys/exec.h> 42 #include <sys/fcntl.h> 43 #include <sys/gzio.h> 44 #include <sys/imgact.h> 45 #include <sys/imgact_elf.h> 46 #include <sys/jail.h> 47 #include <sys/kernel.h> 48 #include <sys/lock.h> 49 #include <sys/malloc.h> 50 #include <sys/mount.h> 51 #include <sys/mman.h> 52 #include <sys/namei.h> 53 #include <sys/pioctl.h> 54 #include <sys/proc.h> 55 #include <sys/procfs.h> 56 #include <sys/ptrace.h> 57 #include <sys/racct.h> 58 #include <sys/resourcevar.h> 59 #include <sys/rwlock.h> 60 #include <sys/sbuf.h> 61 #include <sys/sf_buf.h> 62 #include <sys/smp.h> 63 #include <sys/systm.h> 64 #include <sys/signalvar.h> 65 #include <sys/stat.h> 66 #include <sys/sx.h> 67 #include <sys/syscall.h> 68 #include <sys/sysctl.h> 69 #include <sys/sysent.h> 70 #include <sys/vnode.h> 71 #include <sys/syslog.h> 72 #include <sys/eventhandler.h> 73 #include <sys/user.h> 74 75 #include <vm/vm.h> 76 #include <vm/vm_kern.h> 77 #include <vm/vm_param.h> 78 #include <vm/pmap.h> 79 #include <vm/vm_map.h> 80 #include <vm/vm_object.h> 81 #include <vm/vm_extern.h> 82 83 #include <machine/elf.h> 84 #include <machine/md_var.h> 85 86 #define ELF_NOTE_ROUNDSIZE 4 87 #define OLD_EI_BRAND 8 88 89 static int __elfN(check_header)(const Elf_Ehdr *hdr); 90 static Elf_Brandinfo *__elfN(get_brandinfo)(struct image_params *imgp, 91 const char *interp, int interp_name_len, int32_t *osrel); 92 static int __elfN(load_file)(struct proc *p, const char *file, u_long *addr, 93 u_long *entry, size_t pagesize); 94 static int __elfN(load_section)(struct image_params *imgp, vm_ooffset_t offset, 95 caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot, 96 size_t pagesize); 97 static int __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp); 98 static bool __elfN(freebsd_trans_osrel)(const Elf_Note *note, 99 int32_t *osrel); 100 static bool kfreebsd_trans_osrel(const Elf_Note *note, int32_t *osrel); 101 static boolean_t __elfN(check_note)(struct image_params *imgp, 102 Elf_Brandnote *checknote, int32_t *osrel); 103 static vm_prot_t __elfN(trans_prot)(Elf_Word); 104 static Elf_Word __elfN(untrans_prot)(vm_prot_t); 105 106 SYSCTL_NODE(_kern, OID_AUTO, __CONCAT(elf, __ELF_WORD_SIZE), CTLFLAG_RW, 0, 107 ""); 108 109 #define CORE_BUF_SIZE (16 * 1024) 110 111 int __elfN(fallback_brand) = -1; 112 SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO, 113 fallback_brand, CTLFLAG_RWTUN, &__elfN(fallback_brand), 0, 114 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) " brand of last resort"); 115 116 static int elf_legacy_coredump = 0; 117 SYSCTL_INT(_debug, OID_AUTO, __elfN(legacy_coredump), CTLFLAG_RW, 118 &elf_legacy_coredump, 0, 119 "include all and only RW pages in core dumps"); 120 121 int __elfN(nxstack) = 122 #if defined(__amd64__) || defined(__powerpc64__) /* both 64 and 32 bit */ || \ 123 (defined(__arm__) && __ARM_ARCH >= 7) || defined(__aarch64__) 124 1; 125 #else 126 0; 127 #endif 128 SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO, 129 nxstack, CTLFLAG_RW, &__elfN(nxstack), 0, 130 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) ": enable non-executable stack"); 131 132 #if __ELF_WORD_SIZE == 32 133 #if defined(__amd64__) 134 int i386_read_exec = 0; 135 SYSCTL_INT(_kern_elf32, OID_AUTO, read_exec, CTLFLAG_RW, &i386_read_exec, 0, 136 "enable execution from readable segments"); 137 #endif 138 #endif 139 140 static Elf_Brandinfo *elf_brand_list[MAX_BRANDS]; 141 142 #define trunc_page_ps(va, ps) rounddown2(va, ps) 143 #define round_page_ps(va, ps) roundup2(va, ps) 144 #define aligned(a, t) (trunc_page_ps((u_long)(a), sizeof(t)) == (u_long)(a)) 145 146 static const char FREEBSD_ABI_VENDOR[] = "FreeBSD"; 147 148 Elf_Brandnote __elfN(freebsd_brandnote) = { 149 .hdr.n_namesz = sizeof(FREEBSD_ABI_VENDOR), 150 .hdr.n_descsz = sizeof(int32_t), 151 .hdr.n_type = NT_FREEBSD_ABI_TAG, 152 .vendor = FREEBSD_ABI_VENDOR, 153 .flags = BN_TRANSLATE_OSREL, 154 .trans_osrel = __elfN(freebsd_trans_osrel) 155 }; 156 157 static bool 158 __elfN(freebsd_trans_osrel)(const Elf_Note *note, int32_t *osrel) 159 { 160 uintptr_t p; 161 162 p = (uintptr_t)(note + 1); 163 p += roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE); 164 *osrel = *(const int32_t *)(p); 165 166 return (true); 167 } 168 169 static const char GNU_ABI_VENDOR[] = "GNU"; 170 static int GNU_KFREEBSD_ABI_DESC = 3; 171 172 Elf_Brandnote __elfN(kfreebsd_brandnote) = { 173 .hdr.n_namesz = sizeof(GNU_ABI_VENDOR), 174 .hdr.n_descsz = 16, /* XXX at least 16 */ 175 .hdr.n_type = 1, 176 .vendor = GNU_ABI_VENDOR, 177 .flags = BN_TRANSLATE_OSREL, 178 .trans_osrel = kfreebsd_trans_osrel 179 }; 180 181 static bool 182 kfreebsd_trans_osrel(const Elf_Note *note, int32_t *osrel) 183 { 184 const Elf32_Word *desc; 185 uintptr_t p; 186 187 p = (uintptr_t)(note + 1); 188 p += roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE); 189 190 desc = (const Elf32_Word *)p; 191 if (desc[0] != GNU_KFREEBSD_ABI_DESC) 192 return (false); 193 194 /* 195 * Debian GNU/kFreeBSD embed the earliest compatible kernel version 196 * (__FreeBSD_version: <major><two digit minor>Rxx) in the LSB way. 197 */ 198 *osrel = desc[1] * 100000 + desc[2] * 1000 + desc[3]; 199 200 return (true); 201 } 202 203 int 204 __elfN(insert_brand_entry)(Elf_Brandinfo *entry) 205 { 206 int i; 207 208 for (i = 0; i < MAX_BRANDS; i++) { 209 if (elf_brand_list[i] == NULL) { 210 elf_brand_list[i] = entry; 211 break; 212 } 213 } 214 if (i == MAX_BRANDS) { 215 printf("WARNING: %s: could not insert brandinfo entry: %p\n", 216 __func__, entry); 217 return (-1); 218 } 219 return (0); 220 } 221 222 int 223 __elfN(remove_brand_entry)(Elf_Brandinfo *entry) 224 { 225 int i; 226 227 for (i = 0; i < MAX_BRANDS; i++) { 228 if (elf_brand_list[i] == entry) { 229 elf_brand_list[i] = NULL; 230 break; 231 } 232 } 233 if (i == MAX_BRANDS) 234 return (-1); 235 return (0); 236 } 237 238 int 239 __elfN(brand_inuse)(Elf_Brandinfo *entry) 240 { 241 struct proc *p; 242 int rval = FALSE; 243 244 sx_slock(&allproc_lock); 245 FOREACH_PROC_IN_SYSTEM(p) { 246 if (p->p_sysent == entry->sysvec) { 247 rval = TRUE; 248 break; 249 } 250 } 251 sx_sunlock(&allproc_lock); 252 253 return (rval); 254 } 255 256 static Elf_Brandinfo * 257 __elfN(get_brandinfo)(struct image_params *imgp, const char *interp, 258 int interp_name_len, int32_t *osrel) 259 { 260 const Elf_Ehdr *hdr = (const Elf_Ehdr *)imgp->image_header; 261 Elf_Brandinfo *bi, *bi_m; 262 boolean_t ret; 263 int i; 264 265 /* 266 * We support four types of branding -- (1) the ELF EI_OSABI field 267 * that SCO added to the ELF spec, (2) FreeBSD 3.x's traditional string 268 * branding w/in the ELF header, (3) path of the `interp_path' 269 * field, and (4) the ".note.ABI-tag" ELF section. 270 */ 271 272 /* Look for an ".note.ABI-tag" ELF section */ 273 bi_m = NULL; 274 for (i = 0; i < MAX_BRANDS; i++) { 275 bi = elf_brand_list[i]; 276 if (bi == NULL) 277 continue; 278 if (interp != NULL && (bi->flags & BI_BRAND_ONLY_STATIC) != 0) 279 continue; 280 if (hdr->e_machine == bi->machine && (bi->flags & 281 (BI_BRAND_NOTE|BI_BRAND_NOTE_MANDATORY)) != 0) { 282 ret = __elfN(check_note)(imgp, bi->brand_note, osrel); 283 /* Give brand a chance to veto check_note's guess */ 284 if (ret && bi->header_supported) 285 ret = bi->header_supported(imgp); 286 /* 287 * If note checker claimed the binary, but the 288 * interpreter path in the image does not 289 * match default one for the brand, try to 290 * search for other brands with the same 291 * interpreter. Either there is better brand 292 * with the right interpreter, or, failing 293 * this, we return first brand which accepted 294 * our note and, optionally, header. 295 */ 296 if (ret && bi_m == NULL && interp != NULL && 297 (bi->interp_path == NULL || 298 (strlen(bi->interp_path) + 1 != interp_name_len || 299 strncmp(interp, bi->interp_path, interp_name_len) 300 != 0))) { 301 bi_m = bi; 302 ret = 0; 303 } 304 if (ret) 305 return (bi); 306 } 307 } 308 if (bi_m != NULL) 309 return (bi_m); 310 311 /* If the executable has a brand, search for it in the brand list. */ 312 for (i = 0; i < MAX_BRANDS; i++) { 313 bi = elf_brand_list[i]; 314 if (bi == NULL || (bi->flags & BI_BRAND_NOTE_MANDATORY) != 0 || 315 (interp != NULL && (bi->flags & BI_BRAND_ONLY_STATIC) != 0)) 316 continue; 317 if (hdr->e_machine == bi->machine && 318 (hdr->e_ident[EI_OSABI] == bi->brand || 319 (bi->compat_3_brand != NULL && 320 strcmp((const char *)&hdr->e_ident[OLD_EI_BRAND], 321 bi->compat_3_brand) == 0))) { 322 /* Looks good, but give brand a chance to veto */ 323 if (bi->header_supported == NULL || 324 bi->header_supported(imgp)) { 325 /* 326 * Again, prefer strictly matching 327 * interpreter path. 328 */ 329 if (interp_name_len == 0 && 330 bi->interp_path == NULL) 331 return (bi); 332 if (bi->interp_path != NULL && 333 strlen(bi->interp_path) + 1 == 334 interp_name_len && strncmp(interp, 335 bi->interp_path, interp_name_len) == 0) 336 return (bi); 337 if (bi_m == NULL) 338 bi_m = bi; 339 } 340 } 341 } 342 if (bi_m != NULL) 343 return (bi_m); 344 345 /* No known brand, see if the header is recognized by any brand */ 346 for (i = 0; i < MAX_BRANDS; i++) { 347 bi = elf_brand_list[i]; 348 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY || 349 bi->header_supported == NULL) 350 continue; 351 if (hdr->e_machine == bi->machine) { 352 ret = bi->header_supported(imgp); 353 if (ret) 354 return (bi); 355 } 356 } 357 358 /* Lacking a known brand, search for a recognized interpreter. */ 359 if (interp != NULL) { 360 for (i = 0; i < MAX_BRANDS; i++) { 361 bi = elf_brand_list[i]; 362 if (bi == NULL || (bi->flags & 363 (BI_BRAND_NOTE_MANDATORY | BI_BRAND_ONLY_STATIC)) 364 != 0) 365 continue; 366 if (hdr->e_machine == bi->machine && 367 bi->interp_path != NULL && 368 /* ELF image p_filesz includes terminating zero */ 369 strlen(bi->interp_path) + 1 == interp_name_len && 370 strncmp(interp, bi->interp_path, interp_name_len) 371 == 0 && (bi->header_supported == NULL || 372 bi->header_supported(imgp))) 373 return (bi); 374 } 375 } 376 377 /* Lacking a recognized interpreter, try the default brand */ 378 for (i = 0; i < MAX_BRANDS; i++) { 379 bi = elf_brand_list[i]; 380 if (bi == NULL || (bi->flags & BI_BRAND_NOTE_MANDATORY) != 0 || 381 (interp != NULL && (bi->flags & BI_BRAND_ONLY_STATIC) != 0)) 382 continue; 383 if (hdr->e_machine == bi->machine && 384 __elfN(fallback_brand) == bi->brand && 385 (bi->header_supported == NULL || 386 bi->header_supported(imgp))) 387 return (bi); 388 } 389 return (NULL); 390 } 391 392 static bool 393 __elfN(phdr_in_zero_page)(const Elf_Ehdr *hdr) 394 { 395 return (hdr->e_phoff <= PAGE_SIZE && 396 (u_int)hdr->e_phentsize * hdr->e_phnum <= PAGE_SIZE - hdr->e_phoff); 397 } 398 399 static int 400 __elfN(check_header)(const Elf_Ehdr *hdr) 401 { 402 Elf_Brandinfo *bi; 403 int i; 404 405 if (!IS_ELF(*hdr) || 406 hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS || 407 hdr->e_ident[EI_DATA] != ELF_TARG_DATA || 408 hdr->e_ident[EI_VERSION] != EV_CURRENT || 409 hdr->e_phentsize != sizeof(Elf_Phdr) || 410 hdr->e_version != ELF_TARG_VER) 411 return (ENOEXEC); 412 413 /* 414 * Make sure we have at least one brand for this machine. 415 */ 416 417 for (i = 0; i < MAX_BRANDS; i++) { 418 bi = elf_brand_list[i]; 419 if (bi != NULL && bi->machine == hdr->e_machine) 420 break; 421 } 422 if (i == MAX_BRANDS) 423 return (ENOEXEC); 424 425 return (0); 426 } 427 428 static int 429 __elfN(map_partial)(vm_map_t map, vm_object_t object, vm_ooffset_t offset, 430 vm_offset_t start, vm_offset_t end, vm_prot_t prot) 431 { 432 struct sf_buf *sf; 433 int error; 434 vm_offset_t off; 435 436 /* 437 * Create the page if it doesn't exist yet. Ignore errors. 438 */ 439 vm_map_fixed(map, NULL, 0, trunc_page(start), round_page(end) - 440 trunc_page(start), VM_PROT_ALL, VM_PROT_ALL, MAP_CHECK_EXCL); 441 442 /* 443 * Find the page from the underlying object. 444 */ 445 if (object != NULL) { 446 sf = vm_imgact_map_page(object, offset); 447 if (sf == NULL) 448 return (KERN_FAILURE); 449 off = offset - trunc_page(offset); 450 error = copyout((caddr_t)sf_buf_kva(sf) + off, (caddr_t)start, 451 end - start); 452 vm_imgact_unmap_page(sf); 453 if (error != 0) 454 return (KERN_FAILURE); 455 } 456 457 return (KERN_SUCCESS); 458 } 459 460 static int 461 __elfN(map_insert)(struct image_params *imgp, vm_map_t map, vm_object_t object, 462 vm_ooffset_t offset, vm_offset_t start, vm_offset_t end, vm_prot_t prot, 463 int cow) 464 { 465 struct sf_buf *sf; 466 vm_offset_t off; 467 vm_size_t sz; 468 int error, locked, rv; 469 470 if (start != trunc_page(start)) { 471 rv = __elfN(map_partial)(map, object, offset, start, 472 round_page(start), prot); 473 if (rv != KERN_SUCCESS) 474 return (rv); 475 offset += round_page(start) - start; 476 start = round_page(start); 477 } 478 if (end != round_page(end)) { 479 rv = __elfN(map_partial)(map, object, offset + 480 trunc_page(end) - start, trunc_page(end), end, prot); 481 if (rv != KERN_SUCCESS) 482 return (rv); 483 end = trunc_page(end); 484 } 485 if (start >= end) 486 return (KERN_SUCCESS); 487 if ((offset & PAGE_MASK) != 0) { 488 /* 489 * The mapping is not page aligned. This means that we have 490 * to copy the data. 491 */ 492 rv = vm_map_fixed(map, NULL, 0, start, end - start, 493 prot | VM_PROT_WRITE, VM_PROT_ALL, MAP_CHECK_EXCL); 494 if (rv != KERN_SUCCESS) 495 return (rv); 496 if (object == NULL) 497 return (KERN_SUCCESS); 498 for (; start < end; start += sz) { 499 sf = vm_imgact_map_page(object, offset); 500 if (sf == NULL) 501 return (KERN_FAILURE); 502 off = offset - trunc_page(offset); 503 sz = end - start; 504 if (sz > PAGE_SIZE - off) 505 sz = PAGE_SIZE - off; 506 error = copyout((caddr_t)sf_buf_kva(sf) + off, 507 (caddr_t)start, sz); 508 vm_imgact_unmap_page(sf); 509 if (error != 0) 510 return (KERN_FAILURE); 511 offset += sz; 512 } 513 } else { 514 vm_object_reference(object); 515 rv = vm_map_fixed(map, object, offset, start, end - start, 516 prot, VM_PROT_ALL, cow | MAP_CHECK_EXCL); 517 if (rv != KERN_SUCCESS) { 518 locked = VOP_ISLOCKED(imgp->vp); 519 VOP_UNLOCK(imgp->vp, 0); 520 vm_object_deallocate(object); 521 vn_lock(imgp->vp, locked | LK_RETRY); 522 return (rv); 523 } 524 } 525 return (KERN_SUCCESS); 526 } 527 528 static int 529 __elfN(load_section)(struct image_params *imgp, vm_ooffset_t offset, 530 caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot, 531 size_t pagesize) 532 { 533 struct sf_buf *sf; 534 size_t map_len; 535 vm_map_t map; 536 vm_object_t object; 537 vm_offset_t off, map_addr; 538 int error, rv, cow; 539 size_t copy_len; 540 vm_ooffset_t file_addr; 541 542 /* 543 * It's necessary to fail if the filsz + offset taken from the 544 * header is greater than the actual file pager object's size. 545 * If we were to allow this, then the vm_map_find() below would 546 * walk right off the end of the file object and into the ether. 547 * 548 * While I'm here, might as well check for something else that 549 * is invalid: filsz cannot be greater than memsz. 550 */ 551 if ((filsz != 0 && (off_t)filsz + offset > imgp->attr->va_size) || 552 filsz > memsz) { 553 uprintf("elf_load_section: truncated ELF file\n"); 554 return (ENOEXEC); 555 } 556 557 object = imgp->object; 558 map = &imgp->proc->p_vmspace->vm_map; 559 map_addr = trunc_page_ps((vm_offset_t)vmaddr, pagesize); 560 file_addr = trunc_page_ps(offset, pagesize); 561 562 /* 563 * We have two choices. We can either clear the data in the last page 564 * of an oversized mapping, or we can start the anon mapping a page 565 * early and copy the initialized data into that first page. We 566 * choose the second. 567 */ 568 if (filsz == 0) 569 map_len = 0; 570 else if (memsz > filsz) 571 map_len = trunc_page_ps(offset + filsz, pagesize) - file_addr; 572 else 573 map_len = round_page_ps(offset + filsz, pagesize) - file_addr; 574 575 if (map_len != 0) { 576 /* cow flags: don't dump readonly sections in core */ 577 cow = MAP_COPY_ON_WRITE | MAP_PREFAULT | 578 (prot & VM_PROT_WRITE ? 0 : MAP_DISABLE_COREDUMP); 579 580 rv = __elfN(map_insert)(imgp, map, 581 object, 582 file_addr, /* file offset */ 583 map_addr, /* virtual start */ 584 map_addr + map_len,/* virtual end */ 585 prot, 586 cow); 587 if (rv != KERN_SUCCESS) 588 return (EINVAL); 589 590 /* we can stop now if we've covered it all */ 591 if (memsz == filsz) 592 return (0); 593 } 594 595 596 /* 597 * We have to get the remaining bit of the file into the first part 598 * of the oversized map segment. This is normally because the .data 599 * segment in the file is extended to provide bss. It's a neat idea 600 * to try and save a page, but it's a pain in the behind to implement. 601 */ 602 copy_len = filsz == 0 ? 0 : (offset + filsz) - trunc_page_ps(offset + 603 filsz, pagesize); 604 map_addr = trunc_page_ps((vm_offset_t)vmaddr + filsz, pagesize); 605 map_len = round_page_ps((vm_offset_t)vmaddr + memsz, pagesize) - 606 map_addr; 607 608 /* This had damn well better be true! */ 609 if (map_len != 0) { 610 rv = __elfN(map_insert)(imgp, map, NULL, 0, map_addr, 611 map_addr + map_len, prot, 0); 612 if (rv != KERN_SUCCESS) 613 return (EINVAL); 614 } 615 616 if (copy_len != 0) { 617 sf = vm_imgact_map_page(object, offset + filsz); 618 if (sf == NULL) 619 return (EIO); 620 621 /* send the page fragment to user space */ 622 off = trunc_page_ps(offset + filsz, pagesize) - 623 trunc_page(offset + filsz); 624 error = copyout((caddr_t)sf_buf_kva(sf) + off, 625 (caddr_t)map_addr, copy_len); 626 vm_imgact_unmap_page(sf); 627 if (error != 0) 628 return (error); 629 } 630 631 /* 632 * Remove write access to the page if it was only granted by map_insert 633 * to allow copyout. 634 */ 635 if ((prot & VM_PROT_WRITE) == 0) 636 vm_map_protect(map, trunc_page(map_addr), round_page(map_addr + 637 map_len), prot, FALSE); 638 639 return (0); 640 } 641 642 /* 643 * Load the file "file" into memory. It may be either a shared object 644 * or an executable. 645 * 646 * The "addr" reference parameter is in/out. On entry, it specifies 647 * the address where a shared object should be loaded. If the file is 648 * an executable, this value is ignored. On exit, "addr" specifies 649 * where the file was actually loaded. 650 * 651 * The "entry" reference parameter is out only. On exit, it specifies 652 * the entry point for the loaded file. 653 */ 654 static int 655 __elfN(load_file)(struct proc *p, const char *file, u_long *addr, 656 u_long *entry, size_t pagesize) 657 { 658 struct { 659 struct nameidata nd; 660 struct vattr attr; 661 struct image_params image_params; 662 } *tempdata; 663 const Elf_Ehdr *hdr = NULL; 664 const Elf_Phdr *phdr = NULL; 665 struct nameidata *nd; 666 struct vattr *attr; 667 struct image_params *imgp; 668 vm_prot_t prot; 669 u_long rbase; 670 u_long base_addr = 0; 671 int error, i, numsegs; 672 673 #ifdef CAPABILITY_MODE 674 /* 675 * XXXJA: This check can go away once we are sufficiently confident 676 * that the checks in namei() are correct. 677 */ 678 if (IN_CAPABILITY_MODE(curthread)) 679 return (ECAPMODE); 680 #endif 681 682 tempdata = malloc(sizeof(*tempdata), M_TEMP, M_WAITOK); 683 nd = &tempdata->nd; 684 attr = &tempdata->attr; 685 imgp = &tempdata->image_params; 686 687 /* 688 * Initialize part of the common data 689 */ 690 imgp->proc = p; 691 imgp->attr = attr; 692 imgp->firstpage = NULL; 693 imgp->image_header = NULL; 694 imgp->object = NULL; 695 imgp->execlabel = NULL; 696 697 NDINIT(nd, LOOKUP, ISOPEN | LOCKLEAF | FOLLOW, UIO_SYSSPACE, file, 698 curthread); 699 if ((error = namei(nd)) != 0) { 700 nd->ni_vp = NULL; 701 goto fail; 702 } 703 NDFREE(nd, NDF_ONLY_PNBUF); 704 imgp->vp = nd->ni_vp; 705 706 /* 707 * Check permissions, modes, uid, etc on the file, and "open" it. 708 */ 709 error = exec_check_permissions(imgp); 710 if (error) 711 goto fail; 712 713 error = exec_map_first_page(imgp); 714 if (error) 715 goto fail; 716 717 /* 718 * Also make certain that the interpreter stays the same, so set 719 * its VV_TEXT flag, too. 720 */ 721 VOP_SET_TEXT(nd->ni_vp); 722 723 imgp->object = nd->ni_vp->v_object; 724 725 hdr = (const Elf_Ehdr *)imgp->image_header; 726 if ((error = __elfN(check_header)(hdr)) != 0) 727 goto fail; 728 if (hdr->e_type == ET_DYN) 729 rbase = *addr; 730 else if (hdr->e_type == ET_EXEC) 731 rbase = 0; 732 else { 733 error = ENOEXEC; 734 goto fail; 735 } 736 737 /* Only support headers that fit within first page for now */ 738 if (!__elfN(phdr_in_zero_page)(hdr)) { 739 error = ENOEXEC; 740 goto fail; 741 } 742 743 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 744 if (!aligned(phdr, Elf_Addr)) { 745 error = ENOEXEC; 746 goto fail; 747 } 748 749 for (i = 0, numsegs = 0; i < hdr->e_phnum; i++) { 750 if (phdr[i].p_type == PT_LOAD && phdr[i].p_memsz != 0) { 751 /* Loadable segment */ 752 prot = __elfN(trans_prot)(phdr[i].p_flags); 753 error = __elfN(load_section)(imgp, phdr[i].p_offset, 754 (caddr_t)(uintptr_t)phdr[i].p_vaddr + rbase, 755 phdr[i].p_memsz, phdr[i].p_filesz, prot, pagesize); 756 if (error != 0) 757 goto fail; 758 /* 759 * Establish the base address if this is the 760 * first segment. 761 */ 762 if (numsegs == 0) 763 base_addr = trunc_page(phdr[i].p_vaddr + 764 rbase); 765 numsegs++; 766 } 767 } 768 *addr = base_addr; 769 *entry = (unsigned long)hdr->e_entry + rbase; 770 771 fail: 772 if (imgp->firstpage) 773 exec_unmap_first_page(imgp); 774 775 if (nd->ni_vp) 776 vput(nd->ni_vp); 777 778 free(tempdata, M_TEMP); 779 780 return (error); 781 } 782 783 static int 784 __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp) 785 { 786 struct thread *td; 787 const Elf_Ehdr *hdr; 788 const Elf_Phdr *phdr; 789 Elf_Auxargs *elf_auxargs; 790 struct vmspace *vmspace; 791 const char *err_str, *newinterp; 792 char *interp, *interp_buf, *path; 793 Elf_Brandinfo *brand_info; 794 struct sysentvec *sv; 795 vm_prot_t prot; 796 u_long text_size, data_size, total_size, text_addr, data_addr; 797 u_long seg_size, seg_addr, addr, baddr, et_dyn_addr, entry, proghdr; 798 int32_t osrel; 799 int error, i, n, interp_name_len, have_interp; 800 801 hdr = (const Elf_Ehdr *)imgp->image_header; 802 803 /* 804 * Do we have a valid ELF header ? 805 * 806 * Only allow ET_EXEC & ET_DYN here, reject ET_DYN later 807 * if particular brand doesn't support it. 808 */ 809 if (__elfN(check_header)(hdr) != 0 || 810 (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN)) 811 return (-1); 812 813 /* 814 * From here on down, we return an errno, not -1, as we've 815 * detected an ELF file. 816 */ 817 818 if (!__elfN(phdr_in_zero_page)(hdr)) { 819 uprintf("Program headers not in the first page\n"); 820 return (ENOEXEC); 821 } 822 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 823 if (!aligned(phdr, Elf_Addr)) { 824 uprintf("Unaligned program headers\n"); 825 return (ENOEXEC); 826 } 827 828 n = error = 0; 829 baddr = 0; 830 osrel = 0; 831 text_size = data_size = total_size = text_addr = data_addr = 0; 832 entry = proghdr = 0; 833 interp_name_len = 0; 834 err_str = newinterp = NULL; 835 interp = interp_buf = NULL; 836 td = curthread; 837 838 for (i = 0; i < hdr->e_phnum; i++) { 839 switch (phdr[i].p_type) { 840 case PT_LOAD: 841 if (n == 0) 842 baddr = phdr[i].p_vaddr; 843 n++; 844 break; 845 case PT_INTERP: 846 /* Path to interpreter */ 847 if (phdr[i].p_filesz < 2 || 848 phdr[i].p_filesz > MAXPATHLEN) { 849 uprintf("Invalid PT_INTERP\n"); 850 error = ENOEXEC; 851 goto ret; 852 } 853 if (interp != NULL) { 854 uprintf("Multiple PT_INTERP headers\n"); 855 error = ENOEXEC; 856 goto ret; 857 } 858 interp_name_len = phdr[i].p_filesz; 859 if (phdr[i].p_offset > PAGE_SIZE || 860 interp_name_len > PAGE_SIZE - phdr[i].p_offset) { 861 VOP_UNLOCK(imgp->vp, 0); 862 interp_buf = malloc(interp_name_len + 1, M_TEMP, 863 M_WAITOK); 864 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY); 865 error = vn_rdwr(UIO_READ, imgp->vp, interp_buf, 866 interp_name_len, phdr[i].p_offset, 867 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, 868 NOCRED, NULL, td); 869 if (error != 0) { 870 uprintf("i/o error PT_INTERP %d\n", 871 error); 872 goto ret; 873 } 874 interp_buf[interp_name_len] = '\0'; 875 interp = interp_buf; 876 } else { 877 interp = __DECONST(char *, imgp->image_header) + 878 phdr[i].p_offset; 879 if (interp[interp_name_len - 1] != '\0') { 880 uprintf("Invalid PT_INTERP\n"); 881 error = ENOEXEC; 882 goto ret; 883 } 884 } 885 break; 886 case PT_GNU_STACK: 887 if (__elfN(nxstack)) 888 imgp->stack_prot = 889 __elfN(trans_prot)(phdr[i].p_flags); 890 imgp->stack_sz = phdr[i].p_memsz; 891 break; 892 } 893 } 894 895 brand_info = __elfN(get_brandinfo)(imgp, interp, interp_name_len, 896 &osrel); 897 if (brand_info == NULL) { 898 uprintf("ELF binary type \"%u\" not known.\n", 899 hdr->e_ident[EI_OSABI]); 900 error = ENOEXEC; 901 goto ret; 902 } 903 if (hdr->e_type == ET_DYN) { 904 if ((brand_info->flags & BI_CAN_EXEC_DYN) == 0) { 905 uprintf("Cannot execute shared object\n"); 906 error = ENOEXEC; 907 goto ret; 908 } 909 /* 910 * Honour the base load address from the dso if it is 911 * non-zero for some reason. 912 */ 913 if (baddr == 0) 914 et_dyn_addr = ET_DYN_LOAD_ADDR; 915 else 916 et_dyn_addr = 0; 917 } else 918 et_dyn_addr = 0; 919 sv = brand_info->sysvec; 920 if (interp != NULL && brand_info->interp_newpath != NULL) 921 newinterp = brand_info->interp_newpath; 922 923 /* 924 * Avoid a possible deadlock if the current address space is destroyed 925 * and that address space maps the locked vnode. In the common case, 926 * the locked vnode's v_usecount is decremented but remains greater 927 * than zero. Consequently, the vnode lock is not needed by vrele(). 928 * However, in cases where the vnode lock is external, such as nullfs, 929 * v_usecount may become zero. 930 * 931 * The VV_TEXT flag prevents modifications to the executable while 932 * the vnode is unlocked. 933 */ 934 VOP_UNLOCK(imgp->vp, 0); 935 936 error = exec_new_vmspace(imgp, sv); 937 imgp->proc->p_sysent = sv; 938 939 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY); 940 if (error != 0) 941 goto ret; 942 943 for (i = 0; i < hdr->e_phnum; i++) { 944 switch (phdr[i].p_type) { 945 case PT_LOAD: /* Loadable segment */ 946 if (phdr[i].p_memsz == 0) 947 break; 948 prot = __elfN(trans_prot)(phdr[i].p_flags); 949 error = __elfN(load_section)(imgp, phdr[i].p_offset, 950 (caddr_t)(uintptr_t)phdr[i].p_vaddr + et_dyn_addr, 951 phdr[i].p_memsz, phdr[i].p_filesz, prot, 952 sv->sv_pagesize); 953 if (error != 0) 954 goto ret; 955 956 /* 957 * If this segment contains the program headers, 958 * remember their virtual address for the AT_PHDR 959 * aux entry. Static binaries don't usually include 960 * a PT_PHDR entry. 961 */ 962 if (phdr[i].p_offset == 0 && 963 hdr->e_phoff + hdr->e_phnum * hdr->e_phentsize 964 <= phdr[i].p_filesz) 965 proghdr = phdr[i].p_vaddr + hdr->e_phoff + 966 et_dyn_addr; 967 968 seg_addr = trunc_page(phdr[i].p_vaddr + et_dyn_addr); 969 seg_size = round_page(phdr[i].p_memsz + 970 phdr[i].p_vaddr + et_dyn_addr - seg_addr); 971 972 /* 973 * Make the largest executable segment the official 974 * text segment and all others data. 975 * 976 * Note that obreak() assumes that data_addr + 977 * data_size == end of data load area, and the ELF 978 * file format expects segments to be sorted by 979 * address. If multiple data segments exist, the 980 * last one will be used. 981 */ 982 983 if (phdr[i].p_flags & PF_X && text_size < seg_size) { 984 text_size = seg_size; 985 text_addr = seg_addr; 986 } else { 987 data_size = seg_size; 988 data_addr = seg_addr; 989 } 990 total_size += seg_size; 991 break; 992 case PT_PHDR: /* Program header table info */ 993 proghdr = phdr[i].p_vaddr + et_dyn_addr; 994 break; 995 default: 996 break; 997 } 998 } 999 1000 if (data_addr == 0 && data_size == 0) { 1001 data_addr = text_addr; 1002 data_size = text_size; 1003 } 1004 1005 entry = (u_long)hdr->e_entry + et_dyn_addr; 1006 1007 /* 1008 * Check limits. It should be safe to check the 1009 * limits after loading the segments since we do 1010 * not actually fault in all the segments pages. 1011 */ 1012 PROC_LOCK(imgp->proc); 1013 if (data_size > lim_cur_proc(imgp->proc, RLIMIT_DATA)) 1014 err_str = "Data segment size exceeds process limit"; 1015 else if (text_size > maxtsiz) 1016 err_str = "Text segment size exceeds system limit"; 1017 else if (total_size > lim_cur_proc(imgp->proc, RLIMIT_VMEM)) 1018 err_str = "Total segment size exceeds process limit"; 1019 else if (racct_set(imgp->proc, RACCT_DATA, data_size) != 0) 1020 err_str = "Data segment size exceeds resource limit"; 1021 else if (racct_set(imgp->proc, RACCT_VMEM, total_size) != 0) 1022 err_str = "Total segment size exceeds resource limit"; 1023 if (err_str != NULL) { 1024 PROC_UNLOCK(imgp->proc); 1025 uprintf("%s\n", err_str); 1026 error = ENOMEM; 1027 goto ret; 1028 } 1029 1030 vmspace = imgp->proc->p_vmspace; 1031 vmspace->vm_tsize = text_size >> PAGE_SHIFT; 1032 vmspace->vm_taddr = (caddr_t)(uintptr_t)text_addr; 1033 vmspace->vm_dsize = data_size >> PAGE_SHIFT; 1034 vmspace->vm_daddr = (caddr_t)(uintptr_t)data_addr; 1035 1036 /* 1037 * We load the dynamic linker where a userland call 1038 * to mmap(0, ...) would put it. The rationale behind this 1039 * calculation is that it leaves room for the heap to grow to 1040 * its maximum allowed size. 1041 */ 1042 addr = round_page((vm_offset_t)vmspace->vm_daddr + lim_max(td, 1043 RLIMIT_DATA)); 1044 PROC_UNLOCK(imgp->proc); 1045 1046 imgp->entry_addr = entry; 1047 1048 if (interp != NULL) { 1049 have_interp = FALSE; 1050 VOP_UNLOCK(imgp->vp, 0); 1051 if (brand_info->emul_path != NULL && 1052 brand_info->emul_path[0] != '\0') { 1053 path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 1054 snprintf(path, MAXPATHLEN, "%s%s", 1055 brand_info->emul_path, interp); 1056 error = __elfN(load_file)(imgp->proc, path, &addr, 1057 &imgp->entry_addr, sv->sv_pagesize); 1058 free(path, M_TEMP); 1059 if (error == 0) 1060 have_interp = TRUE; 1061 } 1062 if (!have_interp && newinterp != NULL && 1063 (brand_info->interp_path == NULL || 1064 strcmp(interp, brand_info->interp_path) == 0)) { 1065 error = __elfN(load_file)(imgp->proc, newinterp, &addr, 1066 &imgp->entry_addr, sv->sv_pagesize); 1067 if (error == 0) 1068 have_interp = TRUE; 1069 } 1070 if (!have_interp) { 1071 error = __elfN(load_file)(imgp->proc, interp, &addr, 1072 &imgp->entry_addr, sv->sv_pagesize); 1073 } 1074 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY); 1075 if (error != 0) { 1076 uprintf("ELF interpreter %s not found, error %d\n", 1077 interp, error); 1078 goto ret; 1079 } 1080 } else 1081 addr = et_dyn_addr; 1082 1083 /* 1084 * Construct auxargs table (used by the fixup routine) 1085 */ 1086 elf_auxargs = malloc(sizeof(Elf_Auxargs), M_TEMP, M_WAITOK); 1087 elf_auxargs->execfd = -1; 1088 elf_auxargs->phdr = proghdr; 1089 elf_auxargs->phent = hdr->e_phentsize; 1090 elf_auxargs->phnum = hdr->e_phnum; 1091 elf_auxargs->pagesz = PAGE_SIZE; 1092 elf_auxargs->base = addr; 1093 elf_auxargs->flags = 0; 1094 elf_auxargs->entry = entry; 1095 elf_auxargs->hdr_eflags = hdr->e_flags; 1096 1097 imgp->auxargs = elf_auxargs; 1098 imgp->interpreted = 0; 1099 imgp->reloc_base = addr; 1100 imgp->proc->p_osrel = osrel; 1101 imgp->proc->p_elf_machine = hdr->e_machine; 1102 imgp->proc->p_elf_flags = hdr->e_flags; 1103 1104 ret: 1105 free(interp_buf, M_TEMP); 1106 return (error); 1107 } 1108 1109 #define suword __CONCAT(suword, __ELF_WORD_SIZE) 1110 1111 int 1112 __elfN(freebsd_fixup)(register_t **stack_base, struct image_params *imgp) 1113 { 1114 Elf_Auxargs *args = (Elf_Auxargs *)imgp->auxargs; 1115 Elf_Addr *base; 1116 Elf_Addr *pos; 1117 1118 base = (Elf_Addr *)*stack_base; 1119 pos = base + (imgp->args->argc + imgp->args->envc + 2); 1120 1121 if (args->execfd != -1) 1122 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd); 1123 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr); 1124 AUXARGS_ENTRY(pos, AT_PHENT, args->phent); 1125 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum); 1126 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz); 1127 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags); 1128 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry); 1129 AUXARGS_ENTRY(pos, AT_BASE, args->base); 1130 AUXARGS_ENTRY(pos, AT_EHDRFLAGS, args->hdr_eflags); 1131 if (imgp->execpathp != 0) 1132 AUXARGS_ENTRY(pos, AT_EXECPATH, imgp->execpathp); 1133 AUXARGS_ENTRY(pos, AT_OSRELDATE, 1134 imgp->proc->p_ucred->cr_prison->pr_osreldate); 1135 if (imgp->canary != 0) { 1136 AUXARGS_ENTRY(pos, AT_CANARY, imgp->canary); 1137 AUXARGS_ENTRY(pos, AT_CANARYLEN, imgp->canarylen); 1138 } 1139 AUXARGS_ENTRY(pos, AT_NCPUS, mp_ncpus); 1140 if (imgp->pagesizes != 0) { 1141 AUXARGS_ENTRY(pos, AT_PAGESIZES, imgp->pagesizes); 1142 AUXARGS_ENTRY(pos, AT_PAGESIZESLEN, imgp->pagesizeslen); 1143 } 1144 if (imgp->sysent->sv_timekeep_base != 0) { 1145 AUXARGS_ENTRY(pos, AT_TIMEKEEP, 1146 imgp->sysent->sv_timekeep_base); 1147 } 1148 AUXARGS_ENTRY(pos, AT_STACKPROT, imgp->sysent->sv_shared_page_obj 1149 != NULL && imgp->stack_prot != 0 ? imgp->stack_prot : 1150 imgp->sysent->sv_stackprot); 1151 if ((imgp->sysent->sv_flags & SV_HWCAP) != 0) { 1152 if (imgp->sysent->sv_hwcap != NULL) 1153 AUXARGS_ENTRY(pos, AT_HWCAP, *imgp->sysent->sv_hwcap); 1154 if (imgp->sysent->sv_hwcap2 != NULL) 1155 AUXARGS_ENTRY(pos, AT_HWCAP2, *imgp->sysent->sv_hwcap2); 1156 } 1157 AUXARGS_ENTRY(pos, AT_NULL, 0); 1158 1159 free(imgp->auxargs, M_TEMP); 1160 imgp->auxargs = NULL; 1161 1162 base--; 1163 suword(base, (long)imgp->args->argc); 1164 *stack_base = (register_t *)base; 1165 return (0); 1166 } 1167 1168 /* 1169 * Code for generating ELF core dumps. 1170 */ 1171 1172 typedef void (*segment_callback)(vm_map_entry_t, void *); 1173 1174 /* Closure for cb_put_phdr(). */ 1175 struct phdr_closure { 1176 Elf_Phdr *phdr; /* Program header to fill in */ 1177 Elf_Off offset; /* Offset of segment in core file */ 1178 }; 1179 1180 /* Closure for cb_size_segment(). */ 1181 struct sseg_closure { 1182 int count; /* Count of writable segments. */ 1183 size_t size; /* Total size of all writable segments. */ 1184 }; 1185 1186 typedef void (*outfunc_t)(void *, struct sbuf *, size_t *); 1187 1188 struct note_info { 1189 int type; /* Note type. */ 1190 outfunc_t outfunc; /* Output function. */ 1191 void *outarg; /* Argument for the output function. */ 1192 size_t outsize; /* Output size. */ 1193 TAILQ_ENTRY(note_info) link; /* Link to the next note info. */ 1194 }; 1195 1196 TAILQ_HEAD(note_info_list, note_info); 1197 1198 /* Coredump output parameters. */ 1199 struct coredump_params { 1200 off_t offset; 1201 struct ucred *active_cred; 1202 struct ucred *file_cred; 1203 struct thread *td; 1204 struct vnode *vp; 1205 struct gzio_stream *gzs; 1206 }; 1207 1208 static void cb_put_phdr(vm_map_entry_t, void *); 1209 static void cb_size_segment(vm_map_entry_t, void *); 1210 static int core_write(struct coredump_params *, const void *, size_t, off_t, 1211 enum uio_seg); 1212 static void each_writable_segment(struct thread *, segment_callback, void *); 1213 static int __elfN(corehdr)(struct coredump_params *, int, void *, size_t, 1214 struct note_info_list *, size_t); 1215 static void __elfN(prepare_notes)(struct thread *, struct note_info_list *, 1216 size_t *); 1217 static void __elfN(puthdr)(struct thread *, void *, size_t, int, size_t); 1218 static void __elfN(putnote)(struct note_info *, struct sbuf *); 1219 static size_t register_note(struct note_info_list *, int, outfunc_t, void *); 1220 static int sbuf_drain_core_output(void *, const char *, int); 1221 static int sbuf_drain_count(void *arg, const char *data, int len); 1222 1223 static void __elfN(note_fpregset)(void *, struct sbuf *, size_t *); 1224 static void __elfN(note_prpsinfo)(void *, struct sbuf *, size_t *); 1225 static void __elfN(note_prstatus)(void *, struct sbuf *, size_t *); 1226 static void __elfN(note_threadmd)(void *, struct sbuf *, size_t *); 1227 static void __elfN(note_thrmisc)(void *, struct sbuf *, size_t *); 1228 static void __elfN(note_ptlwpinfo)(void *, struct sbuf *, size_t *); 1229 static void __elfN(note_procstat_auxv)(void *, struct sbuf *, size_t *); 1230 static void __elfN(note_procstat_proc)(void *, struct sbuf *, size_t *); 1231 static void __elfN(note_procstat_psstrings)(void *, struct sbuf *, size_t *); 1232 static void note_procstat_files(void *, struct sbuf *, size_t *); 1233 static void note_procstat_groups(void *, struct sbuf *, size_t *); 1234 static void note_procstat_osrel(void *, struct sbuf *, size_t *); 1235 static void note_procstat_rlimit(void *, struct sbuf *, size_t *); 1236 static void note_procstat_umask(void *, struct sbuf *, size_t *); 1237 static void note_procstat_vmmap(void *, struct sbuf *, size_t *); 1238 1239 #ifdef GZIO 1240 extern int compress_user_cores_gzlevel; 1241 1242 /* 1243 * Write out a core segment to the compression stream. 1244 */ 1245 static int 1246 compress_chunk(struct coredump_params *p, char *base, char *buf, u_int len) 1247 { 1248 u_int chunk_len; 1249 int error; 1250 1251 while (len > 0) { 1252 chunk_len = MIN(len, CORE_BUF_SIZE); 1253 1254 /* 1255 * We can get EFAULT error here. 1256 * In that case zero out the current chunk of the segment. 1257 */ 1258 error = copyin(base, buf, chunk_len); 1259 if (error != 0) 1260 bzero(buf, chunk_len); 1261 error = gzio_write(p->gzs, buf, chunk_len); 1262 if (error != 0) 1263 break; 1264 base += chunk_len; 1265 len -= chunk_len; 1266 } 1267 return (error); 1268 } 1269 1270 static int 1271 core_gz_write(void *base, size_t len, off_t offset, void *arg) 1272 { 1273 1274 return (core_write((struct coredump_params *)arg, base, len, offset, 1275 UIO_SYSSPACE)); 1276 } 1277 #endif /* GZIO */ 1278 1279 static int 1280 core_write(struct coredump_params *p, const void *base, size_t len, 1281 off_t offset, enum uio_seg seg) 1282 { 1283 1284 return (vn_rdwr_inchunks(UIO_WRITE, p->vp, __DECONST(void *, base), 1285 len, offset, seg, IO_UNIT | IO_DIRECT | IO_RANGELOCKED, 1286 p->active_cred, p->file_cred, NULL, p->td)); 1287 } 1288 1289 static int 1290 core_output(void *base, size_t len, off_t offset, struct coredump_params *p, 1291 void *tmpbuf) 1292 { 1293 int error; 1294 1295 #ifdef GZIO 1296 if (p->gzs != NULL) 1297 return (compress_chunk(p, base, tmpbuf, len)); 1298 #endif 1299 /* 1300 * EFAULT is a non-fatal error that we can get, for example, 1301 * if the segment is backed by a file but extends beyond its 1302 * end. 1303 */ 1304 error = core_write(p, base, len, offset, UIO_USERSPACE); 1305 if (error == EFAULT) { 1306 log(LOG_WARNING, "Failed to fully fault in a core file segment " 1307 "at VA %p with size 0x%zx to be written at offset 0x%jx " 1308 "for process %s\n", base, len, offset, curproc->p_comm); 1309 1310 /* 1311 * Write a "real" zero byte at the end of the target region 1312 * in the case this is the last segment. 1313 * The intermediate space will be implicitly zero-filled. 1314 */ 1315 error = core_write(p, zero_region, 1, offset + len - 1, 1316 UIO_SYSSPACE); 1317 } 1318 return (error); 1319 } 1320 1321 /* 1322 * Drain into a core file. 1323 */ 1324 static int 1325 sbuf_drain_core_output(void *arg, const char *data, int len) 1326 { 1327 struct coredump_params *p; 1328 int error, locked; 1329 1330 p = (struct coredump_params *)arg; 1331 1332 /* 1333 * Some kern_proc out routines that print to this sbuf may 1334 * call us with the process lock held. Draining with the 1335 * non-sleepable lock held is unsafe. The lock is needed for 1336 * those routines when dumping a live process. In our case we 1337 * can safely release the lock before draining and acquire 1338 * again after. 1339 */ 1340 locked = PROC_LOCKED(p->td->td_proc); 1341 if (locked) 1342 PROC_UNLOCK(p->td->td_proc); 1343 #ifdef GZIO 1344 if (p->gzs != NULL) 1345 error = gzio_write(p->gzs, __DECONST(char *, data), len); 1346 else 1347 #endif 1348 error = core_write(p, __DECONST(void *, data), len, p->offset, 1349 UIO_SYSSPACE); 1350 if (locked) 1351 PROC_LOCK(p->td->td_proc); 1352 if (error != 0) 1353 return (-error); 1354 p->offset += len; 1355 return (len); 1356 } 1357 1358 /* 1359 * Drain into a counter. 1360 */ 1361 static int 1362 sbuf_drain_count(void *arg, const char *data __unused, int len) 1363 { 1364 size_t *sizep; 1365 1366 sizep = (size_t *)arg; 1367 *sizep += len; 1368 return (len); 1369 } 1370 1371 int 1372 __elfN(coredump)(struct thread *td, struct vnode *vp, off_t limit, int flags) 1373 { 1374 struct ucred *cred = td->td_ucred; 1375 int error = 0; 1376 struct sseg_closure seginfo; 1377 struct note_info_list notelst; 1378 struct coredump_params params; 1379 struct note_info *ninfo; 1380 void *hdr, *tmpbuf; 1381 size_t hdrsize, notesz, coresize; 1382 #ifdef GZIO 1383 boolean_t compress; 1384 1385 compress = (flags & IMGACT_CORE_COMPRESS) != 0; 1386 #endif 1387 hdr = NULL; 1388 tmpbuf = NULL; 1389 TAILQ_INIT(¬elst); 1390 1391 /* Size the program segments. */ 1392 seginfo.count = 0; 1393 seginfo.size = 0; 1394 each_writable_segment(td, cb_size_segment, &seginfo); 1395 1396 /* 1397 * Collect info about the core file header area. 1398 */ 1399 hdrsize = sizeof(Elf_Ehdr) + sizeof(Elf_Phdr) * (1 + seginfo.count); 1400 __elfN(prepare_notes)(td, ¬elst, ¬esz); 1401 coresize = round_page(hdrsize + notesz) + seginfo.size; 1402 1403 /* Set up core dump parameters. */ 1404 params.offset = 0; 1405 params.active_cred = cred; 1406 params.file_cred = NOCRED; 1407 params.td = td; 1408 params.vp = vp; 1409 params.gzs = NULL; 1410 1411 #ifdef RACCT 1412 if (racct_enable) { 1413 PROC_LOCK(td->td_proc); 1414 error = racct_add(td->td_proc, RACCT_CORE, coresize); 1415 PROC_UNLOCK(td->td_proc); 1416 if (error != 0) { 1417 error = EFAULT; 1418 goto done; 1419 } 1420 } 1421 #endif 1422 if (coresize >= limit) { 1423 error = EFAULT; 1424 goto done; 1425 } 1426 1427 #ifdef GZIO 1428 /* Create a compression stream if necessary. */ 1429 if (compress) { 1430 params.gzs = gzio_init(core_gz_write, GZIO_DEFLATE, 1431 CORE_BUF_SIZE, compress_user_cores_gzlevel, ¶ms); 1432 if (params.gzs == NULL) { 1433 error = EFAULT; 1434 goto done; 1435 } 1436 tmpbuf = malloc(CORE_BUF_SIZE, M_TEMP, M_WAITOK | M_ZERO); 1437 } 1438 #endif 1439 1440 /* 1441 * Allocate memory for building the header, fill it up, 1442 * and write it out following the notes. 1443 */ 1444 hdr = malloc(hdrsize, M_TEMP, M_WAITOK); 1445 error = __elfN(corehdr)(¶ms, seginfo.count, hdr, hdrsize, ¬elst, 1446 notesz); 1447 1448 /* Write the contents of all of the writable segments. */ 1449 if (error == 0) { 1450 Elf_Phdr *php; 1451 off_t offset; 1452 int i; 1453 1454 php = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr)) + 1; 1455 offset = round_page(hdrsize + notesz); 1456 for (i = 0; i < seginfo.count; i++) { 1457 error = core_output((caddr_t)(uintptr_t)php->p_vaddr, 1458 php->p_filesz, offset, ¶ms, tmpbuf); 1459 if (error != 0) 1460 break; 1461 offset += php->p_filesz; 1462 php++; 1463 } 1464 #ifdef GZIO 1465 if (error == 0 && compress) 1466 error = gzio_flush(params.gzs); 1467 #endif 1468 } 1469 if (error) { 1470 log(LOG_WARNING, 1471 "Failed to write core file for process %s (error %d)\n", 1472 curproc->p_comm, error); 1473 } 1474 1475 done: 1476 #ifdef GZIO 1477 if (compress) { 1478 free(tmpbuf, M_TEMP); 1479 if (params.gzs != NULL) 1480 gzio_fini(params.gzs); 1481 } 1482 #endif 1483 while ((ninfo = TAILQ_FIRST(¬elst)) != NULL) { 1484 TAILQ_REMOVE(¬elst, ninfo, link); 1485 free(ninfo, M_TEMP); 1486 } 1487 if (hdr != NULL) 1488 free(hdr, M_TEMP); 1489 1490 return (error); 1491 } 1492 1493 /* 1494 * A callback for each_writable_segment() to write out the segment's 1495 * program header entry. 1496 */ 1497 static void 1498 cb_put_phdr(entry, closure) 1499 vm_map_entry_t entry; 1500 void *closure; 1501 { 1502 struct phdr_closure *phc = (struct phdr_closure *)closure; 1503 Elf_Phdr *phdr = phc->phdr; 1504 1505 phc->offset = round_page(phc->offset); 1506 1507 phdr->p_type = PT_LOAD; 1508 phdr->p_offset = phc->offset; 1509 phdr->p_vaddr = entry->start; 1510 phdr->p_paddr = 0; 1511 phdr->p_filesz = phdr->p_memsz = entry->end - entry->start; 1512 phdr->p_align = PAGE_SIZE; 1513 phdr->p_flags = __elfN(untrans_prot)(entry->protection); 1514 1515 phc->offset += phdr->p_filesz; 1516 phc->phdr++; 1517 } 1518 1519 /* 1520 * A callback for each_writable_segment() to gather information about 1521 * the number of segments and their total size. 1522 */ 1523 static void 1524 cb_size_segment(entry, closure) 1525 vm_map_entry_t entry; 1526 void *closure; 1527 { 1528 struct sseg_closure *ssc = (struct sseg_closure *)closure; 1529 1530 ssc->count++; 1531 ssc->size += entry->end - entry->start; 1532 } 1533 1534 /* 1535 * For each writable segment in the process's memory map, call the given 1536 * function with a pointer to the map entry and some arbitrary 1537 * caller-supplied data. 1538 */ 1539 static void 1540 each_writable_segment(td, func, closure) 1541 struct thread *td; 1542 segment_callback func; 1543 void *closure; 1544 { 1545 struct proc *p = td->td_proc; 1546 vm_map_t map = &p->p_vmspace->vm_map; 1547 vm_map_entry_t entry; 1548 vm_object_t backing_object, object; 1549 boolean_t ignore_entry; 1550 1551 vm_map_lock_read(map); 1552 for (entry = map->header.next; entry != &map->header; 1553 entry = entry->next) { 1554 /* 1555 * Don't dump inaccessible mappings, deal with legacy 1556 * coredump mode. 1557 * 1558 * Note that read-only segments related to the elf binary 1559 * are marked MAP_ENTRY_NOCOREDUMP now so we no longer 1560 * need to arbitrarily ignore such segments. 1561 */ 1562 if (elf_legacy_coredump) { 1563 if ((entry->protection & VM_PROT_RW) != VM_PROT_RW) 1564 continue; 1565 } else { 1566 if ((entry->protection & VM_PROT_ALL) == 0) 1567 continue; 1568 } 1569 1570 /* 1571 * Dont include memory segment in the coredump if 1572 * MAP_NOCORE is set in mmap(2) or MADV_NOCORE in 1573 * madvise(2). Do not dump submaps (i.e. parts of the 1574 * kernel map). 1575 */ 1576 if (entry->eflags & (MAP_ENTRY_NOCOREDUMP|MAP_ENTRY_IS_SUB_MAP)) 1577 continue; 1578 1579 if ((object = entry->object.vm_object) == NULL) 1580 continue; 1581 1582 /* Ignore memory-mapped devices and such things. */ 1583 VM_OBJECT_RLOCK(object); 1584 while ((backing_object = object->backing_object) != NULL) { 1585 VM_OBJECT_RLOCK(backing_object); 1586 VM_OBJECT_RUNLOCK(object); 1587 object = backing_object; 1588 } 1589 ignore_entry = object->type != OBJT_DEFAULT && 1590 object->type != OBJT_SWAP && object->type != OBJT_VNODE && 1591 object->type != OBJT_PHYS; 1592 VM_OBJECT_RUNLOCK(object); 1593 if (ignore_entry) 1594 continue; 1595 1596 (*func)(entry, closure); 1597 } 1598 vm_map_unlock_read(map); 1599 } 1600 1601 /* 1602 * Write the core file header to the file, including padding up to 1603 * the page boundary. 1604 */ 1605 static int 1606 __elfN(corehdr)(struct coredump_params *p, int numsegs, void *hdr, 1607 size_t hdrsize, struct note_info_list *notelst, size_t notesz) 1608 { 1609 struct note_info *ninfo; 1610 struct sbuf *sb; 1611 int error; 1612 1613 /* Fill in the header. */ 1614 bzero(hdr, hdrsize); 1615 __elfN(puthdr)(p->td, hdr, hdrsize, numsegs, notesz); 1616 1617 sb = sbuf_new(NULL, NULL, CORE_BUF_SIZE, SBUF_FIXEDLEN); 1618 sbuf_set_drain(sb, sbuf_drain_core_output, p); 1619 sbuf_start_section(sb, NULL); 1620 sbuf_bcat(sb, hdr, hdrsize); 1621 TAILQ_FOREACH(ninfo, notelst, link) 1622 __elfN(putnote)(ninfo, sb); 1623 /* Align up to a page boundary for the program segments. */ 1624 sbuf_end_section(sb, -1, PAGE_SIZE, 0); 1625 error = sbuf_finish(sb); 1626 sbuf_delete(sb); 1627 1628 return (error); 1629 } 1630 1631 static void 1632 __elfN(prepare_notes)(struct thread *td, struct note_info_list *list, 1633 size_t *sizep) 1634 { 1635 struct proc *p; 1636 struct thread *thr; 1637 size_t size; 1638 1639 p = td->td_proc; 1640 size = 0; 1641 1642 size += register_note(list, NT_PRPSINFO, __elfN(note_prpsinfo), p); 1643 1644 /* 1645 * To have the debugger select the right thread (LWP) as the initial 1646 * thread, we dump the state of the thread passed to us in td first. 1647 * This is the thread that causes the core dump and thus likely to 1648 * be the right thread one wants to have selected in the debugger. 1649 */ 1650 thr = td; 1651 while (thr != NULL) { 1652 size += register_note(list, NT_PRSTATUS, 1653 __elfN(note_prstatus), thr); 1654 size += register_note(list, NT_FPREGSET, 1655 __elfN(note_fpregset), thr); 1656 size += register_note(list, NT_THRMISC, 1657 __elfN(note_thrmisc), thr); 1658 size += register_note(list, NT_PTLWPINFO, 1659 __elfN(note_ptlwpinfo), thr); 1660 size += register_note(list, -1, 1661 __elfN(note_threadmd), thr); 1662 1663 thr = (thr == td) ? TAILQ_FIRST(&p->p_threads) : 1664 TAILQ_NEXT(thr, td_plist); 1665 if (thr == td) 1666 thr = TAILQ_NEXT(thr, td_plist); 1667 } 1668 1669 size += register_note(list, NT_PROCSTAT_PROC, 1670 __elfN(note_procstat_proc), p); 1671 size += register_note(list, NT_PROCSTAT_FILES, 1672 note_procstat_files, p); 1673 size += register_note(list, NT_PROCSTAT_VMMAP, 1674 note_procstat_vmmap, p); 1675 size += register_note(list, NT_PROCSTAT_GROUPS, 1676 note_procstat_groups, p); 1677 size += register_note(list, NT_PROCSTAT_UMASK, 1678 note_procstat_umask, p); 1679 size += register_note(list, NT_PROCSTAT_RLIMIT, 1680 note_procstat_rlimit, p); 1681 size += register_note(list, NT_PROCSTAT_OSREL, 1682 note_procstat_osrel, p); 1683 size += register_note(list, NT_PROCSTAT_PSSTRINGS, 1684 __elfN(note_procstat_psstrings), p); 1685 size += register_note(list, NT_PROCSTAT_AUXV, 1686 __elfN(note_procstat_auxv), p); 1687 1688 *sizep = size; 1689 } 1690 1691 static void 1692 __elfN(puthdr)(struct thread *td, void *hdr, size_t hdrsize, int numsegs, 1693 size_t notesz) 1694 { 1695 Elf_Ehdr *ehdr; 1696 Elf_Phdr *phdr; 1697 struct phdr_closure phc; 1698 1699 ehdr = (Elf_Ehdr *)hdr; 1700 phdr = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr)); 1701 1702 ehdr->e_ident[EI_MAG0] = ELFMAG0; 1703 ehdr->e_ident[EI_MAG1] = ELFMAG1; 1704 ehdr->e_ident[EI_MAG2] = ELFMAG2; 1705 ehdr->e_ident[EI_MAG3] = ELFMAG3; 1706 ehdr->e_ident[EI_CLASS] = ELF_CLASS; 1707 ehdr->e_ident[EI_DATA] = ELF_DATA; 1708 ehdr->e_ident[EI_VERSION] = EV_CURRENT; 1709 ehdr->e_ident[EI_OSABI] = ELFOSABI_FREEBSD; 1710 ehdr->e_ident[EI_ABIVERSION] = 0; 1711 ehdr->e_ident[EI_PAD] = 0; 1712 ehdr->e_type = ET_CORE; 1713 ehdr->e_machine = td->td_proc->p_elf_machine; 1714 ehdr->e_version = EV_CURRENT; 1715 ehdr->e_entry = 0; 1716 ehdr->e_phoff = sizeof(Elf_Ehdr); 1717 ehdr->e_flags = td->td_proc->p_elf_flags; 1718 ehdr->e_ehsize = sizeof(Elf_Ehdr); 1719 ehdr->e_phentsize = sizeof(Elf_Phdr); 1720 ehdr->e_phnum = numsegs + 1; 1721 ehdr->e_shentsize = sizeof(Elf_Shdr); 1722 ehdr->e_shnum = 0; 1723 ehdr->e_shstrndx = SHN_UNDEF; 1724 1725 /* 1726 * Fill in the program header entries. 1727 */ 1728 1729 /* The note segement. */ 1730 phdr->p_type = PT_NOTE; 1731 phdr->p_offset = hdrsize; 1732 phdr->p_vaddr = 0; 1733 phdr->p_paddr = 0; 1734 phdr->p_filesz = notesz; 1735 phdr->p_memsz = 0; 1736 phdr->p_flags = PF_R; 1737 phdr->p_align = ELF_NOTE_ROUNDSIZE; 1738 phdr++; 1739 1740 /* All the writable segments from the program. */ 1741 phc.phdr = phdr; 1742 phc.offset = round_page(hdrsize + notesz); 1743 each_writable_segment(td, cb_put_phdr, &phc); 1744 } 1745 1746 static size_t 1747 register_note(struct note_info_list *list, int type, outfunc_t out, void *arg) 1748 { 1749 struct note_info *ninfo; 1750 size_t size, notesize; 1751 1752 size = 0; 1753 out(arg, NULL, &size); 1754 ninfo = malloc(sizeof(*ninfo), M_TEMP, M_ZERO | M_WAITOK); 1755 ninfo->type = type; 1756 ninfo->outfunc = out; 1757 ninfo->outarg = arg; 1758 ninfo->outsize = size; 1759 TAILQ_INSERT_TAIL(list, ninfo, link); 1760 1761 if (type == -1) 1762 return (size); 1763 1764 notesize = sizeof(Elf_Note) + /* note header */ 1765 roundup2(sizeof(FREEBSD_ABI_VENDOR), ELF_NOTE_ROUNDSIZE) + 1766 /* note name */ 1767 roundup2(size, ELF_NOTE_ROUNDSIZE); /* note description */ 1768 1769 return (notesize); 1770 } 1771 1772 static size_t 1773 append_note_data(const void *src, void *dst, size_t len) 1774 { 1775 size_t padded_len; 1776 1777 padded_len = roundup2(len, ELF_NOTE_ROUNDSIZE); 1778 if (dst != NULL) { 1779 bcopy(src, dst, len); 1780 bzero((char *)dst + len, padded_len - len); 1781 } 1782 return (padded_len); 1783 } 1784 1785 size_t 1786 __elfN(populate_note)(int type, void *src, void *dst, size_t size, void **descp) 1787 { 1788 Elf_Note *note; 1789 char *buf; 1790 size_t notesize; 1791 1792 buf = dst; 1793 if (buf != NULL) { 1794 note = (Elf_Note *)buf; 1795 note->n_namesz = sizeof(FREEBSD_ABI_VENDOR); 1796 note->n_descsz = size; 1797 note->n_type = type; 1798 buf += sizeof(*note); 1799 buf += append_note_data(FREEBSD_ABI_VENDOR, buf, 1800 sizeof(FREEBSD_ABI_VENDOR)); 1801 append_note_data(src, buf, size); 1802 if (descp != NULL) 1803 *descp = buf; 1804 } 1805 1806 notesize = sizeof(Elf_Note) + /* note header */ 1807 roundup2(sizeof(FREEBSD_ABI_VENDOR), ELF_NOTE_ROUNDSIZE) + 1808 /* note name */ 1809 roundup2(size, ELF_NOTE_ROUNDSIZE); /* note description */ 1810 1811 return (notesize); 1812 } 1813 1814 static void 1815 __elfN(putnote)(struct note_info *ninfo, struct sbuf *sb) 1816 { 1817 Elf_Note note; 1818 ssize_t old_len, sect_len; 1819 size_t new_len, descsz, i; 1820 1821 if (ninfo->type == -1) { 1822 ninfo->outfunc(ninfo->outarg, sb, &ninfo->outsize); 1823 return; 1824 } 1825 1826 note.n_namesz = sizeof(FREEBSD_ABI_VENDOR); 1827 note.n_descsz = ninfo->outsize; 1828 note.n_type = ninfo->type; 1829 1830 sbuf_bcat(sb, ¬e, sizeof(note)); 1831 sbuf_start_section(sb, &old_len); 1832 sbuf_bcat(sb, FREEBSD_ABI_VENDOR, sizeof(FREEBSD_ABI_VENDOR)); 1833 sbuf_end_section(sb, old_len, ELF_NOTE_ROUNDSIZE, 0); 1834 if (note.n_descsz == 0) 1835 return; 1836 sbuf_start_section(sb, &old_len); 1837 ninfo->outfunc(ninfo->outarg, sb, &ninfo->outsize); 1838 sect_len = sbuf_end_section(sb, old_len, ELF_NOTE_ROUNDSIZE, 0); 1839 if (sect_len < 0) 1840 return; 1841 1842 new_len = (size_t)sect_len; 1843 descsz = roundup(note.n_descsz, ELF_NOTE_ROUNDSIZE); 1844 if (new_len < descsz) { 1845 /* 1846 * It is expected that individual note emitters will correctly 1847 * predict their expected output size and fill up to that size 1848 * themselves, padding in a format-specific way if needed. 1849 * However, in case they don't, just do it here with zeros. 1850 */ 1851 for (i = 0; i < descsz - new_len; i++) 1852 sbuf_putc(sb, 0); 1853 } else if (new_len > descsz) { 1854 /* 1855 * We can't always truncate sb -- we may have drained some 1856 * of it already. 1857 */ 1858 KASSERT(new_len == descsz, ("%s: Note type %u changed as we " 1859 "read it (%zu > %zu). Since it is longer than " 1860 "expected, this coredump's notes are corrupt. THIS " 1861 "IS A BUG in the note_procstat routine for type %u.\n", 1862 __func__, (unsigned)note.n_type, new_len, descsz, 1863 (unsigned)note.n_type)); 1864 } 1865 } 1866 1867 /* 1868 * Miscellaneous note out functions. 1869 */ 1870 1871 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 1872 #include <compat/freebsd32/freebsd32.h> 1873 #include <compat/freebsd32/freebsd32_signal.h> 1874 1875 typedef struct prstatus32 elf_prstatus_t; 1876 typedef struct prpsinfo32 elf_prpsinfo_t; 1877 typedef struct fpreg32 elf_prfpregset_t; 1878 typedef struct fpreg32 elf_fpregset_t; 1879 typedef struct reg32 elf_gregset_t; 1880 typedef struct thrmisc32 elf_thrmisc_t; 1881 #define ELF_KERN_PROC_MASK KERN_PROC_MASK32 1882 typedef struct kinfo_proc32 elf_kinfo_proc_t; 1883 typedef uint32_t elf_ps_strings_t; 1884 #else 1885 typedef prstatus_t elf_prstatus_t; 1886 typedef prpsinfo_t elf_prpsinfo_t; 1887 typedef prfpregset_t elf_prfpregset_t; 1888 typedef prfpregset_t elf_fpregset_t; 1889 typedef gregset_t elf_gregset_t; 1890 typedef thrmisc_t elf_thrmisc_t; 1891 #define ELF_KERN_PROC_MASK 0 1892 typedef struct kinfo_proc elf_kinfo_proc_t; 1893 typedef vm_offset_t elf_ps_strings_t; 1894 #endif 1895 1896 static void 1897 __elfN(note_prpsinfo)(void *arg, struct sbuf *sb, size_t *sizep) 1898 { 1899 struct sbuf sbarg; 1900 size_t len; 1901 char *cp, *end; 1902 struct proc *p; 1903 elf_prpsinfo_t *psinfo; 1904 int error; 1905 1906 p = (struct proc *)arg; 1907 if (sb != NULL) { 1908 KASSERT(*sizep == sizeof(*psinfo), ("invalid size")); 1909 psinfo = malloc(sizeof(*psinfo), M_TEMP, M_ZERO | M_WAITOK); 1910 psinfo->pr_version = PRPSINFO_VERSION; 1911 psinfo->pr_psinfosz = sizeof(elf_prpsinfo_t); 1912 strlcpy(psinfo->pr_fname, p->p_comm, sizeof(psinfo->pr_fname)); 1913 PROC_LOCK(p); 1914 if (p->p_args != NULL) { 1915 len = sizeof(psinfo->pr_psargs) - 1; 1916 if (len > p->p_args->ar_length) 1917 len = p->p_args->ar_length; 1918 memcpy(psinfo->pr_psargs, p->p_args->ar_args, len); 1919 PROC_UNLOCK(p); 1920 error = 0; 1921 } else { 1922 _PHOLD(p); 1923 PROC_UNLOCK(p); 1924 sbuf_new(&sbarg, psinfo->pr_psargs, 1925 sizeof(psinfo->pr_psargs), SBUF_FIXEDLEN); 1926 error = proc_getargv(curthread, p, &sbarg); 1927 PRELE(p); 1928 if (sbuf_finish(&sbarg) == 0) 1929 len = sbuf_len(&sbarg) - 1; 1930 else 1931 len = sizeof(psinfo->pr_psargs) - 1; 1932 sbuf_delete(&sbarg); 1933 } 1934 if (error || len == 0) 1935 strlcpy(psinfo->pr_psargs, p->p_comm, 1936 sizeof(psinfo->pr_psargs)); 1937 else { 1938 KASSERT(len < sizeof(psinfo->pr_psargs), 1939 ("len is too long: %zu vs %zu", len, 1940 sizeof(psinfo->pr_psargs))); 1941 cp = psinfo->pr_psargs; 1942 end = cp + len - 1; 1943 for (;;) { 1944 cp = memchr(cp, '\0', end - cp); 1945 if (cp == NULL) 1946 break; 1947 *cp = ' '; 1948 } 1949 } 1950 psinfo->pr_pid = p->p_pid; 1951 sbuf_bcat(sb, psinfo, sizeof(*psinfo)); 1952 free(psinfo, M_TEMP); 1953 } 1954 *sizep = sizeof(*psinfo); 1955 } 1956 1957 static void 1958 __elfN(note_prstatus)(void *arg, struct sbuf *sb, size_t *sizep) 1959 { 1960 struct thread *td; 1961 elf_prstatus_t *status; 1962 1963 td = (struct thread *)arg; 1964 if (sb != NULL) { 1965 KASSERT(*sizep == sizeof(*status), ("invalid size")); 1966 status = malloc(sizeof(*status), M_TEMP, M_ZERO | M_WAITOK); 1967 status->pr_version = PRSTATUS_VERSION; 1968 status->pr_statussz = sizeof(elf_prstatus_t); 1969 status->pr_gregsetsz = sizeof(elf_gregset_t); 1970 status->pr_fpregsetsz = sizeof(elf_fpregset_t); 1971 status->pr_osreldate = osreldate; 1972 status->pr_cursig = td->td_proc->p_sig; 1973 status->pr_pid = td->td_tid; 1974 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 1975 fill_regs32(td, &status->pr_reg); 1976 #else 1977 fill_regs(td, &status->pr_reg); 1978 #endif 1979 sbuf_bcat(sb, status, sizeof(*status)); 1980 free(status, M_TEMP); 1981 } 1982 *sizep = sizeof(*status); 1983 } 1984 1985 static void 1986 __elfN(note_fpregset)(void *arg, struct sbuf *sb, size_t *sizep) 1987 { 1988 struct thread *td; 1989 elf_prfpregset_t *fpregset; 1990 1991 td = (struct thread *)arg; 1992 if (sb != NULL) { 1993 KASSERT(*sizep == sizeof(*fpregset), ("invalid size")); 1994 fpregset = malloc(sizeof(*fpregset), M_TEMP, M_ZERO | M_WAITOK); 1995 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 1996 fill_fpregs32(td, fpregset); 1997 #else 1998 fill_fpregs(td, fpregset); 1999 #endif 2000 sbuf_bcat(sb, fpregset, sizeof(*fpregset)); 2001 free(fpregset, M_TEMP); 2002 } 2003 *sizep = sizeof(*fpregset); 2004 } 2005 2006 static void 2007 __elfN(note_thrmisc)(void *arg, struct sbuf *sb, size_t *sizep) 2008 { 2009 struct thread *td; 2010 elf_thrmisc_t thrmisc; 2011 2012 td = (struct thread *)arg; 2013 if (sb != NULL) { 2014 KASSERT(*sizep == sizeof(thrmisc), ("invalid size")); 2015 bzero(&thrmisc, sizeof(thrmisc)); 2016 strcpy(thrmisc.pr_tname, td->td_name); 2017 sbuf_bcat(sb, &thrmisc, sizeof(thrmisc)); 2018 } 2019 *sizep = sizeof(thrmisc); 2020 } 2021 2022 static void 2023 __elfN(note_ptlwpinfo)(void *arg, struct sbuf *sb, size_t *sizep) 2024 { 2025 struct thread *td; 2026 size_t size; 2027 int structsize; 2028 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 2029 struct ptrace_lwpinfo32 pl; 2030 #else 2031 struct ptrace_lwpinfo pl; 2032 #endif 2033 2034 td = (struct thread *)arg; 2035 size = sizeof(structsize) + sizeof(pl); 2036 if (sb != NULL) { 2037 KASSERT(*sizep == size, ("invalid size")); 2038 structsize = sizeof(pl); 2039 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2040 bzero(&pl, sizeof(pl)); 2041 pl.pl_lwpid = td->td_tid; 2042 pl.pl_event = PL_EVENT_NONE; 2043 pl.pl_sigmask = td->td_sigmask; 2044 pl.pl_siglist = td->td_siglist; 2045 if (td->td_si.si_signo != 0) { 2046 pl.pl_event = PL_EVENT_SIGNAL; 2047 pl.pl_flags |= PL_FLAG_SI; 2048 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 2049 siginfo_to_siginfo32(&td->td_si, &pl.pl_siginfo); 2050 #else 2051 pl.pl_siginfo = td->td_si; 2052 #endif 2053 } 2054 strcpy(pl.pl_tdname, td->td_name); 2055 /* XXX TODO: supply more information in struct ptrace_lwpinfo*/ 2056 sbuf_bcat(sb, &pl, sizeof(pl)); 2057 } 2058 *sizep = size; 2059 } 2060 2061 /* 2062 * Allow for MD specific notes, as well as any MD 2063 * specific preparations for writing MI notes. 2064 */ 2065 static void 2066 __elfN(note_threadmd)(void *arg, struct sbuf *sb, size_t *sizep) 2067 { 2068 struct thread *td; 2069 void *buf; 2070 size_t size; 2071 2072 td = (struct thread *)arg; 2073 size = *sizep; 2074 if (size != 0 && sb != NULL) 2075 buf = malloc(size, M_TEMP, M_ZERO | M_WAITOK); 2076 else 2077 buf = NULL; 2078 size = 0; 2079 __elfN(dump_thread)(td, buf, &size); 2080 KASSERT(sb == NULL || *sizep == size, ("invalid size")); 2081 if (size != 0 && sb != NULL) 2082 sbuf_bcat(sb, buf, size); 2083 free(buf, M_TEMP); 2084 *sizep = size; 2085 } 2086 2087 #ifdef KINFO_PROC_SIZE 2088 CTASSERT(sizeof(struct kinfo_proc) == KINFO_PROC_SIZE); 2089 #endif 2090 2091 static void 2092 __elfN(note_procstat_proc)(void *arg, struct sbuf *sb, size_t *sizep) 2093 { 2094 struct proc *p; 2095 size_t size; 2096 int structsize; 2097 2098 p = (struct proc *)arg; 2099 size = sizeof(structsize) + p->p_numthreads * 2100 sizeof(elf_kinfo_proc_t); 2101 2102 if (sb != NULL) { 2103 KASSERT(*sizep == size, ("invalid size")); 2104 structsize = sizeof(elf_kinfo_proc_t); 2105 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2106 sx_slock(&proctree_lock); 2107 PROC_LOCK(p); 2108 kern_proc_out(p, sb, ELF_KERN_PROC_MASK); 2109 sx_sunlock(&proctree_lock); 2110 } 2111 *sizep = size; 2112 } 2113 2114 #ifdef KINFO_FILE_SIZE 2115 CTASSERT(sizeof(struct kinfo_file) == KINFO_FILE_SIZE); 2116 #endif 2117 2118 static void 2119 note_procstat_files(void *arg, struct sbuf *sb, size_t *sizep) 2120 { 2121 struct proc *p; 2122 size_t size, sect_sz, i; 2123 ssize_t start_len, sect_len; 2124 int structsize, filedesc_flags; 2125 2126 if (coredump_pack_fileinfo) 2127 filedesc_flags = KERN_FILEDESC_PACK_KINFO; 2128 else 2129 filedesc_flags = 0; 2130 2131 p = (struct proc *)arg; 2132 structsize = sizeof(struct kinfo_file); 2133 if (sb == NULL) { 2134 size = 0; 2135 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN); 2136 sbuf_set_drain(sb, sbuf_drain_count, &size); 2137 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2138 PROC_LOCK(p); 2139 kern_proc_filedesc_out(p, sb, -1, filedesc_flags); 2140 sbuf_finish(sb); 2141 sbuf_delete(sb); 2142 *sizep = size; 2143 } else { 2144 sbuf_start_section(sb, &start_len); 2145 2146 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2147 PROC_LOCK(p); 2148 kern_proc_filedesc_out(p, sb, *sizep - sizeof(structsize), 2149 filedesc_flags); 2150 2151 sect_len = sbuf_end_section(sb, start_len, 0, 0); 2152 if (sect_len < 0) 2153 return; 2154 sect_sz = sect_len; 2155 2156 KASSERT(sect_sz <= *sizep, 2157 ("kern_proc_filedesc_out did not respect maxlen; " 2158 "requested %zu, got %zu", *sizep - sizeof(structsize), 2159 sect_sz - sizeof(structsize))); 2160 2161 for (i = 0; i < *sizep - sect_sz && sb->s_error == 0; i++) 2162 sbuf_putc(sb, 0); 2163 } 2164 } 2165 2166 #ifdef KINFO_VMENTRY_SIZE 2167 CTASSERT(sizeof(struct kinfo_vmentry) == KINFO_VMENTRY_SIZE); 2168 #endif 2169 2170 static void 2171 note_procstat_vmmap(void *arg, struct sbuf *sb, size_t *sizep) 2172 { 2173 struct proc *p; 2174 size_t size; 2175 int structsize, vmmap_flags; 2176 2177 if (coredump_pack_vmmapinfo) 2178 vmmap_flags = KERN_VMMAP_PACK_KINFO; 2179 else 2180 vmmap_flags = 0; 2181 2182 p = (struct proc *)arg; 2183 structsize = sizeof(struct kinfo_vmentry); 2184 if (sb == NULL) { 2185 size = 0; 2186 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN); 2187 sbuf_set_drain(sb, sbuf_drain_count, &size); 2188 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2189 PROC_LOCK(p); 2190 kern_proc_vmmap_out(p, sb, -1, vmmap_flags); 2191 sbuf_finish(sb); 2192 sbuf_delete(sb); 2193 *sizep = size; 2194 } else { 2195 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2196 PROC_LOCK(p); 2197 kern_proc_vmmap_out(p, sb, *sizep - sizeof(structsize), 2198 vmmap_flags); 2199 } 2200 } 2201 2202 static void 2203 note_procstat_groups(void *arg, struct sbuf *sb, size_t *sizep) 2204 { 2205 struct proc *p; 2206 size_t size; 2207 int structsize; 2208 2209 p = (struct proc *)arg; 2210 size = sizeof(structsize) + p->p_ucred->cr_ngroups * sizeof(gid_t); 2211 if (sb != NULL) { 2212 KASSERT(*sizep == size, ("invalid size")); 2213 structsize = sizeof(gid_t); 2214 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2215 sbuf_bcat(sb, p->p_ucred->cr_groups, p->p_ucred->cr_ngroups * 2216 sizeof(gid_t)); 2217 } 2218 *sizep = size; 2219 } 2220 2221 static void 2222 note_procstat_umask(void *arg, struct sbuf *sb, size_t *sizep) 2223 { 2224 struct proc *p; 2225 size_t size; 2226 int structsize; 2227 2228 p = (struct proc *)arg; 2229 size = sizeof(structsize) + sizeof(p->p_fd->fd_cmask); 2230 if (sb != NULL) { 2231 KASSERT(*sizep == size, ("invalid size")); 2232 structsize = sizeof(p->p_fd->fd_cmask); 2233 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2234 sbuf_bcat(sb, &p->p_fd->fd_cmask, sizeof(p->p_fd->fd_cmask)); 2235 } 2236 *sizep = size; 2237 } 2238 2239 static void 2240 note_procstat_rlimit(void *arg, struct sbuf *sb, size_t *sizep) 2241 { 2242 struct proc *p; 2243 struct rlimit rlim[RLIM_NLIMITS]; 2244 size_t size; 2245 int structsize, i; 2246 2247 p = (struct proc *)arg; 2248 size = sizeof(structsize) + sizeof(rlim); 2249 if (sb != NULL) { 2250 KASSERT(*sizep == size, ("invalid size")); 2251 structsize = sizeof(rlim); 2252 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2253 PROC_LOCK(p); 2254 for (i = 0; i < RLIM_NLIMITS; i++) 2255 lim_rlimit_proc(p, i, &rlim[i]); 2256 PROC_UNLOCK(p); 2257 sbuf_bcat(sb, rlim, sizeof(rlim)); 2258 } 2259 *sizep = size; 2260 } 2261 2262 static void 2263 note_procstat_osrel(void *arg, struct sbuf *sb, size_t *sizep) 2264 { 2265 struct proc *p; 2266 size_t size; 2267 int structsize; 2268 2269 p = (struct proc *)arg; 2270 size = sizeof(structsize) + sizeof(p->p_osrel); 2271 if (sb != NULL) { 2272 KASSERT(*sizep == size, ("invalid size")); 2273 structsize = sizeof(p->p_osrel); 2274 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2275 sbuf_bcat(sb, &p->p_osrel, sizeof(p->p_osrel)); 2276 } 2277 *sizep = size; 2278 } 2279 2280 static void 2281 __elfN(note_procstat_psstrings)(void *arg, struct sbuf *sb, size_t *sizep) 2282 { 2283 struct proc *p; 2284 elf_ps_strings_t ps_strings; 2285 size_t size; 2286 int structsize; 2287 2288 p = (struct proc *)arg; 2289 size = sizeof(structsize) + sizeof(ps_strings); 2290 if (sb != NULL) { 2291 KASSERT(*sizep == size, ("invalid size")); 2292 structsize = sizeof(ps_strings); 2293 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 2294 ps_strings = PTROUT(p->p_sysent->sv_psstrings); 2295 #else 2296 ps_strings = p->p_sysent->sv_psstrings; 2297 #endif 2298 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2299 sbuf_bcat(sb, &ps_strings, sizeof(ps_strings)); 2300 } 2301 *sizep = size; 2302 } 2303 2304 static void 2305 __elfN(note_procstat_auxv)(void *arg, struct sbuf *sb, size_t *sizep) 2306 { 2307 struct proc *p; 2308 size_t size; 2309 int structsize; 2310 2311 p = (struct proc *)arg; 2312 if (sb == NULL) { 2313 size = 0; 2314 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN); 2315 sbuf_set_drain(sb, sbuf_drain_count, &size); 2316 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2317 PHOLD(p); 2318 proc_getauxv(curthread, p, sb); 2319 PRELE(p); 2320 sbuf_finish(sb); 2321 sbuf_delete(sb); 2322 *sizep = size; 2323 } else { 2324 structsize = sizeof(Elf_Auxinfo); 2325 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2326 PHOLD(p); 2327 proc_getauxv(curthread, p, sb); 2328 PRELE(p); 2329 } 2330 } 2331 2332 static boolean_t 2333 __elfN(parse_notes)(struct image_params *imgp, Elf_Note *checknote, 2334 const char *note_vendor, const Elf_Phdr *pnote, 2335 boolean_t (*cb)(const Elf_Note *, void *, boolean_t *), void *cb_arg) 2336 { 2337 const Elf_Note *note, *note0, *note_end; 2338 const char *note_name; 2339 char *buf; 2340 int i, error; 2341 boolean_t res; 2342 2343 /* We need some limit, might as well use PAGE_SIZE. */ 2344 if (pnote == NULL || pnote->p_filesz > PAGE_SIZE) 2345 return (FALSE); 2346 ASSERT_VOP_LOCKED(imgp->vp, "parse_notes"); 2347 if (pnote->p_offset > PAGE_SIZE || 2348 pnote->p_filesz > PAGE_SIZE - pnote->p_offset) { 2349 VOP_UNLOCK(imgp->vp, 0); 2350 buf = malloc(pnote->p_filesz, M_TEMP, M_WAITOK); 2351 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY); 2352 error = vn_rdwr(UIO_READ, imgp->vp, buf, pnote->p_filesz, 2353 pnote->p_offset, UIO_SYSSPACE, IO_NODELOCKED, 2354 curthread->td_ucred, NOCRED, NULL, curthread); 2355 if (error != 0) { 2356 uprintf("i/o error PT_NOTE\n"); 2357 goto retf; 2358 } 2359 note = note0 = (const Elf_Note *)buf; 2360 note_end = (const Elf_Note *)(buf + pnote->p_filesz); 2361 } else { 2362 note = note0 = (const Elf_Note *)(imgp->image_header + 2363 pnote->p_offset); 2364 note_end = (const Elf_Note *)(imgp->image_header + 2365 pnote->p_offset + pnote->p_filesz); 2366 buf = NULL; 2367 } 2368 for (i = 0; i < 100 && note >= note0 && note < note_end; i++) { 2369 if (!aligned(note, Elf32_Addr) || (const char *)note_end - 2370 (const char *)note < sizeof(Elf_Note)) { 2371 goto retf; 2372 } 2373 if (note->n_namesz != checknote->n_namesz || 2374 note->n_descsz != checknote->n_descsz || 2375 note->n_type != checknote->n_type) 2376 goto nextnote; 2377 note_name = (const char *)(note + 1); 2378 if (note_name + checknote->n_namesz >= 2379 (const char *)note_end || strncmp(note_vendor, 2380 note_name, checknote->n_namesz) != 0) 2381 goto nextnote; 2382 2383 if (cb(note, cb_arg, &res)) 2384 goto ret; 2385 nextnote: 2386 note = (const Elf_Note *)((const char *)(note + 1) + 2387 roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE) + 2388 roundup2(note->n_descsz, ELF_NOTE_ROUNDSIZE)); 2389 } 2390 retf: 2391 res = FALSE; 2392 ret: 2393 free(buf, M_TEMP); 2394 return (res); 2395 } 2396 2397 struct brandnote_cb_arg { 2398 Elf_Brandnote *brandnote; 2399 int32_t *osrel; 2400 }; 2401 2402 static boolean_t 2403 brandnote_cb(const Elf_Note *note, void *arg0, boolean_t *res) 2404 { 2405 struct brandnote_cb_arg *arg; 2406 2407 arg = arg0; 2408 2409 /* 2410 * Fetch the osreldate for binary from the ELF OSABI-note if 2411 * necessary. 2412 */ 2413 *res = (arg->brandnote->flags & BN_TRANSLATE_OSREL) != 0 && 2414 arg->brandnote->trans_osrel != NULL ? 2415 arg->brandnote->trans_osrel(note, arg->osrel) : TRUE; 2416 2417 return (TRUE); 2418 } 2419 2420 /* 2421 * Try to find the appropriate ABI-note section for checknote, 2422 * fetch the osreldate for binary from the ELF OSABI-note. Only the 2423 * first page of the image is searched, the same as for headers. 2424 */ 2425 static boolean_t 2426 __elfN(check_note)(struct image_params *imgp, Elf_Brandnote *brandnote, 2427 int32_t *osrel) 2428 { 2429 const Elf_Phdr *phdr; 2430 const Elf_Ehdr *hdr; 2431 struct brandnote_cb_arg b_arg; 2432 int i; 2433 2434 hdr = (const Elf_Ehdr *)imgp->image_header; 2435 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 2436 b_arg.brandnote = brandnote; 2437 b_arg.osrel = osrel; 2438 2439 for (i = 0; i < hdr->e_phnum; i++) { 2440 if (phdr[i].p_type == PT_NOTE && __elfN(parse_notes)(imgp, 2441 &brandnote->hdr, brandnote->vendor, &phdr[i], brandnote_cb, 2442 &b_arg)) { 2443 return (TRUE); 2444 } 2445 } 2446 return (FALSE); 2447 2448 } 2449 2450 /* 2451 * Tell kern_execve.c about it, with a little help from the linker. 2452 */ 2453 static struct execsw __elfN(execsw) = { 2454 __CONCAT(exec_, __elfN(imgact)), 2455 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) 2456 }; 2457 EXEC_SET(__CONCAT(elf, __ELF_WORD_SIZE), __elfN(execsw)); 2458 2459 static vm_prot_t 2460 __elfN(trans_prot)(Elf_Word flags) 2461 { 2462 vm_prot_t prot; 2463 2464 prot = 0; 2465 if (flags & PF_X) 2466 prot |= VM_PROT_EXECUTE; 2467 if (flags & PF_W) 2468 prot |= VM_PROT_WRITE; 2469 if (flags & PF_R) 2470 prot |= VM_PROT_READ; 2471 #if __ELF_WORD_SIZE == 32 2472 #if defined(__amd64__) 2473 if (i386_read_exec && (flags & PF_R)) 2474 prot |= VM_PROT_EXECUTE; 2475 #endif 2476 #endif 2477 return (prot); 2478 } 2479 2480 static Elf_Word 2481 __elfN(untrans_prot)(vm_prot_t prot) 2482 { 2483 Elf_Word flags; 2484 2485 flags = 0; 2486 if (prot & VM_PROT_EXECUTE) 2487 flags |= PF_X; 2488 if (prot & VM_PROT_READ) 2489 flags |= PF_R; 2490 if (prot & VM_PROT_WRITE) 2491 flags |= PF_W; 2492 return (flags); 2493 }
Cache object: 8766f0697822b5fb18318f6ea1f952ca
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]