Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/kern/imgact_elf.c
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1 /*- 2 * Copyright (c) 2000 David O'Brien 3 * Copyright (c) 1995-1996 Søren Schmidt 4 * Copyright (c) 1996 Peter Wemm 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer 12 * in this position and unchanged. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. The name of the author may not be used to endorse or promote products 17 * derived from this software without specific prior written permission 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD: releng/11.1/sys/kern/imgact_elf.c 338606 2018-09-12 05:07:35Z gordon $"); 33 34 #include "opt_capsicum.h" 35 #include "opt_compat.h" 36 #include "opt_gzio.h" 37 38 #include <sys/param.h> 39 #include <sys/capsicum.h> 40 #include <sys/exec.h> 41 #include <sys/fcntl.h> 42 #include <sys/gzio.h> 43 #include <sys/imgact.h> 44 #include <sys/imgact_elf.h> 45 #include <sys/jail.h> 46 #include <sys/kernel.h> 47 #include <sys/lock.h> 48 #include <sys/malloc.h> 49 #include <sys/mount.h> 50 #include <sys/mman.h> 51 #include <sys/namei.h> 52 #include <sys/pioctl.h> 53 #include <sys/proc.h> 54 #include <sys/procfs.h> 55 #include <sys/racct.h> 56 #include <sys/resourcevar.h> 57 #include <sys/rwlock.h> 58 #include <sys/sbuf.h> 59 #include <sys/sf_buf.h> 60 #include <sys/smp.h> 61 #include <sys/systm.h> 62 #include <sys/signalvar.h> 63 #include <sys/stat.h> 64 #include <sys/sx.h> 65 #include <sys/syscall.h> 66 #include <sys/sysctl.h> 67 #include <sys/sysent.h> 68 #include <sys/vnode.h> 69 #include <sys/syslog.h> 70 #include <sys/eventhandler.h> 71 #include <sys/user.h> 72 73 #include <vm/vm.h> 74 #include <vm/vm_kern.h> 75 #include <vm/vm_param.h> 76 #include <vm/pmap.h> 77 #include <vm/vm_map.h> 78 #include <vm/vm_object.h> 79 #include <vm/vm_extern.h> 80 81 #include <machine/elf.h> 82 #include <machine/md_var.h> 83 84 #define ELF_NOTE_ROUNDSIZE 4 85 #define OLD_EI_BRAND 8 86 87 static int __elfN(check_header)(const Elf_Ehdr *hdr); 88 static Elf_Brandinfo *__elfN(get_brandinfo)(struct image_params *imgp, 89 const char *interp, int interp_name_len, int32_t *osrel); 90 static int __elfN(load_file)(struct proc *p, const char *file, u_long *addr, 91 u_long *entry, size_t pagesize); 92 static int __elfN(load_section)(struct image_params *imgp, vm_ooffset_t offset, 93 caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot, 94 size_t pagesize); 95 static int __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp); 96 static boolean_t __elfN(freebsd_trans_osrel)(const Elf_Note *note, 97 int32_t *osrel); 98 static boolean_t kfreebsd_trans_osrel(const Elf_Note *note, int32_t *osrel); 99 static boolean_t __elfN(check_note)(struct image_params *imgp, 100 Elf_Brandnote *checknote, int32_t *osrel); 101 static vm_prot_t __elfN(trans_prot)(Elf_Word); 102 static Elf_Word __elfN(untrans_prot)(vm_prot_t); 103 104 SYSCTL_NODE(_kern, OID_AUTO, __CONCAT(elf, __ELF_WORD_SIZE), CTLFLAG_RW, 0, 105 ""); 106 107 #define CORE_BUF_SIZE (16 * 1024) 108 109 int __elfN(fallback_brand) = -1; 110 SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO, 111 fallback_brand, CTLFLAG_RWTUN, &__elfN(fallback_brand), 0, 112 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) " brand of last resort"); 113 114 static int elf_legacy_coredump = 0; 115 SYSCTL_INT(_debug, OID_AUTO, __elfN(legacy_coredump), CTLFLAG_RW, 116 &elf_legacy_coredump, 0, 117 "include all and only RW pages in core dumps"); 118 119 int __elfN(nxstack) = 120 #if defined(__amd64__) || defined(__powerpc64__) /* both 64 and 32 bit */ || \ 121 (defined(__arm__) && __ARM_ARCH >= 7) || defined(__aarch64__) 122 1; 123 #else 124 0; 125 #endif 126 SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO, 127 nxstack, CTLFLAG_RW, &__elfN(nxstack), 0, 128 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) ": enable non-executable stack"); 129 130 #if __ELF_WORD_SIZE == 32 131 #if defined(__amd64__) 132 int i386_read_exec = 0; 133 SYSCTL_INT(_kern_elf32, OID_AUTO, read_exec, CTLFLAG_RW, &i386_read_exec, 0, 134 "enable execution from readable segments"); 135 #endif 136 #endif 137 138 static Elf_Brandinfo *elf_brand_list[MAX_BRANDS]; 139 140 #define trunc_page_ps(va, ps) rounddown2(va, ps) 141 #define round_page_ps(va, ps) roundup2(va, ps) 142 #define aligned(a, t) (trunc_page_ps((u_long)(a), sizeof(t)) == (u_long)(a)) 143 144 static const char FREEBSD_ABI_VENDOR[] = "FreeBSD"; 145 146 Elf_Brandnote __elfN(freebsd_brandnote) = { 147 .hdr.n_namesz = sizeof(FREEBSD_ABI_VENDOR), 148 .hdr.n_descsz = sizeof(int32_t), 149 .hdr.n_type = NT_FREEBSD_ABI_TAG, 150 .vendor = FREEBSD_ABI_VENDOR, 151 .flags = BN_TRANSLATE_OSREL, 152 .trans_osrel = __elfN(freebsd_trans_osrel) 153 }; 154 155 static boolean_t 156 __elfN(freebsd_trans_osrel)(const Elf_Note *note, int32_t *osrel) 157 { 158 uintptr_t p; 159 160 p = (uintptr_t)(note + 1); 161 p += roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE); 162 *osrel = *(const int32_t *)(p); 163 164 return (TRUE); 165 } 166 167 static const char GNU_ABI_VENDOR[] = "GNU"; 168 static int GNU_KFREEBSD_ABI_DESC = 3; 169 170 Elf_Brandnote __elfN(kfreebsd_brandnote) = { 171 .hdr.n_namesz = sizeof(GNU_ABI_VENDOR), 172 .hdr.n_descsz = 16, /* XXX at least 16 */ 173 .hdr.n_type = 1, 174 .vendor = GNU_ABI_VENDOR, 175 .flags = BN_TRANSLATE_OSREL, 176 .trans_osrel = kfreebsd_trans_osrel 177 }; 178 179 static boolean_t 180 kfreebsd_trans_osrel(const Elf_Note *note, int32_t *osrel) 181 { 182 const Elf32_Word *desc; 183 uintptr_t p; 184 185 p = (uintptr_t)(note + 1); 186 p += roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE); 187 188 desc = (const Elf32_Word *)p; 189 if (desc[0] != GNU_KFREEBSD_ABI_DESC) 190 return (FALSE); 191 192 /* 193 * Debian GNU/kFreeBSD embed the earliest compatible kernel version 194 * (__FreeBSD_version: <major><two digit minor>Rxx) in the LSB way. 195 */ 196 *osrel = desc[1] * 100000 + desc[2] * 1000 + desc[3]; 197 198 return (TRUE); 199 } 200 201 int 202 __elfN(insert_brand_entry)(Elf_Brandinfo *entry) 203 { 204 int i; 205 206 for (i = 0; i < MAX_BRANDS; i++) { 207 if (elf_brand_list[i] == NULL) { 208 elf_brand_list[i] = entry; 209 break; 210 } 211 } 212 if (i == MAX_BRANDS) { 213 printf("WARNING: %s: could not insert brandinfo entry: %p\n", 214 __func__, entry); 215 return (-1); 216 } 217 return (0); 218 } 219 220 int 221 __elfN(remove_brand_entry)(Elf_Brandinfo *entry) 222 { 223 int i; 224 225 for (i = 0; i < MAX_BRANDS; i++) { 226 if (elf_brand_list[i] == entry) { 227 elf_brand_list[i] = NULL; 228 break; 229 } 230 } 231 if (i == MAX_BRANDS) 232 return (-1); 233 return (0); 234 } 235 236 int 237 __elfN(brand_inuse)(Elf_Brandinfo *entry) 238 { 239 struct proc *p; 240 int rval = FALSE; 241 242 sx_slock(&allproc_lock); 243 FOREACH_PROC_IN_SYSTEM(p) { 244 if (p->p_sysent == entry->sysvec) { 245 rval = TRUE; 246 break; 247 } 248 } 249 sx_sunlock(&allproc_lock); 250 251 return (rval); 252 } 253 254 static Elf_Brandinfo * 255 __elfN(get_brandinfo)(struct image_params *imgp, const char *interp, 256 int interp_name_len, int32_t *osrel) 257 { 258 const Elf_Ehdr *hdr = (const Elf_Ehdr *)imgp->image_header; 259 Elf_Brandinfo *bi, *bi_m; 260 boolean_t ret; 261 int i; 262 263 /* 264 * We support four types of branding -- (1) the ELF EI_OSABI field 265 * that SCO added to the ELF spec, (2) FreeBSD 3.x's traditional string 266 * branding w/in the ELF header, (3) path of the `interp_path' 267 * field, and (4) the ".note.ABI-tag" ELF section. 268 */ 269 270 /* Look for an ".note.ABI-tag" ELF section */ 271 bi_m = NULL; 272 for (i = 0; i < MAX_BRANDS; i++) { 273 bi = elf_brand_list[i]; 274 if (bi == NULL) 275 continue; 276 if (interp != NULL && (bi->flags & BI_BRAND_ONLY_STATIC) != 0) 277 continue; 278 if (hdr->e_machine == bi->machine && (bi->flags & 279 (BI_BRAND_NOTE|BI_BRAND_NOTE_MANDATORY)) != 0) { 280 ret = __elfN(check_note)(imgp, bi->brand_note, osrel); 281 /* Give brand a chance to veto check_note's guess */ 282 if (ret && bi->header_supported) 283 ret = bi->header_supported(imgp); 284 /* 285 * If note checker claimed the binary, but the 286 * interpreter path in the image does not 287 * match default one for the brand, try to 288 * search for other brands with the same 289 * interpreter. Either there is better brand 290 * with the right interpreter, or, failing 291 * this, we return first brand which accepted 292 * our note and, optionally, header. 293 */ 294 if (ret && bi_m == NULL && interp != NULL && 295 (bi->interp_path == NULL || 296 (strlen(bi->interp_path) + 1 != interp_name_len || 297 strncmp(interp, bi->interp_path, interp_name_len) 298 != 0))) { 299 bi_m = bi; 300 ret = 0; 301 } 302 if (ret) 303 return (bi); 304 } 305 } 306 if (bi_m != NULL) 307 return (bi_m); 308 309 /* If the executable has a brand, search for it in the brand list. */ 310 for (i = 0; i < MAX_BRANDS; i++) { 311 bi = elf_brand_list[i]; 312 if (bi == NULL || (bi->flags & BI_BRAND_NOTE_MANDATORY) != 0 || 313 (interp != NULL && (bi->flags & BI_BRAND_ONLY_STATIC) != 0)) 314 continue; 315 if (hdr->e_machine == bi->machine && 316 (hdr->e_ident[EI_OSABI] == bi->brand || 317 (bi->compat_3_brand != NULL && 318 strcmp((const char *)&hdr->e_ident[OLD_EI_BRAND], 319 bi->compat_3_brand) == 0))) { 320 /* Looks good, but give brand a chance to veto */ 321 if (!bi->header_supported || 322 bi->header_supported(imgp)) { 323 /* 324 * Again, prefer strictly matching 325 * interpreter path. 326 */ 327 if (interp_name_len == 0 && 328 bi->interp_path == NULL) 329 return (bi); 330 if (bi->interp_path != NULL && 331 strlen(bi->interp_path) + 1 == 332 interp_name_len && strncmp(interp, 333 bi->interp_path, interp_name_len) == 0) 334 return (bi); 335 if (bi_m == NULL) 336 bi_m = bi; 337 } 338 } 339 } 340 if (bi_m != NULL) 341 return (bi_m); 342 343 /* No known brand, see if the header is recognized by any brand */ 344 for (i = 0; i < MAX_BRANDS; i++) { 345 bi = elf_brand_list[i]; 346 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY || 347 bi->header_supported == NULL) 348 continue; 349 if (hdr->e_machine == bi->machine) { 350 ret = bi->header_supported(imgp); 351 if (ret) 352 return (bi); 353 } 354 } 355 356 /* Lacking a known brand, search for a recognized interpreter. */ 357 if (interp != NULL) { 358 for (i = 0; i < MAX_BRANDS; i++) { 359 bi = elf_brand_list[i]; 360 if (bi == NULL || (bi->flags & 361 (BI_BRAND_NOTE_MANDATORY | BI_BRAND_ONLY_STATIC)) 362 != 0) 363 continue; 364 if (hdr->e_machine == bi->machine && 365 bi->interp_path != NULL && 366 /* ELF image p_filesz includes terminating zero */ 367 strlen(bi->interp_path) + 1 == interp_name_len && 368 strncmp(interp, bi->interp_path, interp_name_len) 369 == 0) 370 return (bi); 371 } 372 } 373 374 /* Lacking a recognized interpreter, try the default brand */ 375 for (i = 0; i < MAX_BRANDS; i++) { 376 bi = elf_brand_list[i]; 377 if (bi == NULL || (bi->flags & BI_BRAND_NOTE_MANDATORY) != 0 || 378 (interp != NULL && (bi->flags & BI_BRAND_ONLY_STATIC) != 0)) 379 continue; 380 if (hdr->e_machine == bi->machine && 381 __elfN(fallback_brand) == bi->brand) 382 return (bi); 383 } 384 return (NULL); 385 } 386 387 static int 388 __elfN(check_header)(const Elf_Ehdr *hdr) 389 { 390 Elf_Brandinfo *bi; 391 int i; 392 393 if (!IS_ELF(*hdr) || 394 hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS || 395 hdr->e_ident[EI_DATA] != ELF_TARG_DATA || 396 hdr->e_ident[EI_VERSION] != EV_CURRENT || 397 hdr->e_phentsize != sizeof(Elf_Phdr) || 398 hdr->e_version != ELF_TARG_VER) 399 return (ENOEXEC); 400 401 /* 402 * Make sure we have at least one brand for this machine. 403 */ 404 405 for (i = 0; i < MAX_BRANDS; i++) { 406 bi = elf_brand_list[i]; 407 if (bi != NULL && bi->machine == hdr->e_machine) 408 break; 409 } 410 if (i == MAX_BRANDS) 411 return (ENOEXEC); 412 413 return (0); 414 } 415 416 static int 417 __elfN(map_partial)(vm_map_t map, vm_object_t object, vm_ooffset_t offset, 418 vm_offset_t start, vm_offset_t end, vm_prot_t prot) 419 { 420 struct sf_buf *sf; 421 int error; 422 vm_offset_t off; 423 424 /* 425 * Create the page if it doesn't exist yet. Ignore errors. 426 */ 427 vm_map_fixed(map, NULL, 0, trunc_page(start), round_page(end) - 428 trunc_page(start), VM_PROT_ALL, VM_PROT_ALL, MAP_CHECK_EXCL); 429 430 /* 431 * Find the page from the underlying object. 432 */ 433 if (object != NULL) { 434 sf = vm_imgact_map_page(object, offset); 435 if (sf == NULL) 436 return (KERN_FAILURE); 437 off = offset - trunc_page(offset); 438 error = copyout((caddr_t)sf_buf_kva(sf) + off, (caddr_t)start, 439 end - start); 440 vm_imgact_unmap_page(sf); 441 if (error != 0) 442 return (KERN_FAILURE); 443 } 444 445 return (KERN_SUCCESS); 446 } 447 448 static int 449 __elfN(map_insert)(struct image_params *imgp, vm_map_t map, vm_object_t object, 450 vm_ooffset_t offset, vm_offset_t start, vm_offset_t end, vm_prot_t prot, 451 int cow) 452 { 453 struct sf_buf *sf; 454 vm_offset_t off; 455 vm_size_t sz; 456 int error, locked, rv; 457 458 if (start != trunc_page(start)) { 459 rv = __elfN(map_partial)(map, object, offset, start, 460 round_page(start), prot); 461 if (rv != KERN_SUCCESS) 462 return (rv); 463 offset += round_page(start) - start; 464 start = round_page(start); 465 } 466 if (end != round_page(end)) { 467 rv = __elfN(map_partial)(map, object, offset + 468 trunc_page(end) - start, trunc_page(end), end, prot); 469 if (rv != KERN_SUCCESS) 470 return (rv); 471 end = trunc_page(end); 472 } 473 if (start >= end) 474 return (KERN_SUCCESS); 475 if ((offset & PAGE_MASK) != 0) { 476 /* 477 * The mapping is not page aligned. This means that we have 478 * to copy the data. 479 */ 480 rv = vm_map_fixed(map, NULL, 0, start, end - start, 481 prot | VM_PROT_WRITE, VM_PROT_ALL, MAP_CHECK_EXCL); 482 if (rv != KERN_SUCCESS) 483 return (rv); 484 if (object == NULL) 485 return (KERN_SUCCESS); 486 for (; start < end; start += sz) { 487 sf = vm_imgact_map_page(object, offset); 488 if (sf == NULL) 489 return (KERN_FAILURE); 490 off = offset - trunc_page(offset); 491 sz = end - start; 492 if (sz > PAGE_SIZE - off) 493 sz = PAGE_SIZE - off; 494 error = copyout((caddr_t)sf_buf_kva(sf) + off, 495 (caddr_t)start, sz); 496 vm_imgact_unmap_page(sf); 497 if (error != 0) 498 return (KERN_FAILURE); 499 offset += sz; 500 } 501 } else { 502 vm_object_reference(object); 503 rv = vm_map_fixed(map, object, offset, start, end - start, 504 prot, VM_PROT_ALL, cow | MAP_CHECK_EXCL); 505 if (rv != KERN_SUCCESS) { 506 locked = VOP_ISLOCKED(imgp->vp); 507 VOP_UNLOCK(imgp->vp, 0); 508 vm_object_deallocate(object); 509 vn_lock(imgp->vp, locked | LK_RETRY); 510 return (rv); 511 } 512 } 513 return (KERN_SUCCESS); 514 } 515 516 static int 517 __elfN(load_section)(struct image_params *imgp, vm_ooffset_t offset, 518 caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot, 519 size_t pagesize) 520 { 521 struct sf_buf *sf; 522 size_t map_len; 523 vm_map_t map; 524 vm_object_t object; 525 vm_offset_t off, map_addr; 526 int error, rv, cow; 527 size_t copy_len; 528 vm_ooffset_t file_addr; 529 530 /* 531 * It's necessary to fail if the filsz + offset taken from the 532 * header is greater than the actual file pager object's size. 533 * If we were to allow this, then the vm_map_find() below would 534 * walk right off the end of the file object and into the ether. 535 * 536 * While I'm here, might as well check for something else that 537 * is invalid: filsz cannot be greater than memsz. 538 */ 539 if ((filsz != 0 && (off_t)filsz + offset > imgp->attr->va_size) || 540 filsz > memsz) { 541 uprintf("elf_load_section: truncated ELF file\n"); 542 return (ENOEXEC); 543 } 544 545 object = imgp->object; 546 map = &imgp->proc->p_vmspace->vm_map; 547 map_addr = trunc_page_ps((vm_offset_t)vmaddr, pagesize); 548 file_addr = trunc_page_ps(offset, pagesize); 549 550 /* 551 * We have two choices. We can either clear the data in the last page 552 * of an oversized mapping, or we can start the anon mapping a page 553 * early and copy the initialized data into that first page. We 554 * choose the second. 555 */ 556 if (filsz == 0) 557 map_len = 0; 558 else if (memsz > filsz) 559 map_len = trunc_page_ps(offset + filsz, pagesize) - file_addr; 560 else 561 map_len = round_page_ps(offset + filsz, pagesize) - file_addr; 562 563 if (map_len != 0) { 564 /* cow flags: don't dump readonly sections in core */ 565 cow = MAP_COPY_ON_WRITE | MAP_PREFAULT | 566 (prot & VM_PROT_WRITE ? 0 : MAP_DISABLE_COREDUMP); 567 568 rv = __elfN(map_insert)(imgp, map, 569 object, 570 file_addr, /* file offset */ 571 map_addr, /* virtual start */ 572 map_addr + map_len,/* virtual end */ 573 prot, 574 cow); 575 if (rv != KERN_SUCCESS) 576 return (EINVAL); 577 578 /* we can stop now if we've covered it all */ 579 if (memsz == filsz) 580 return (0); 581 } 582 583 584 /* 585 * We have to get the remaining bit of the file into the first part 586 * of the oversized map segment. This is normally because the .data 587 * segment in the file is extended to provide bss. It's a neat idea 588 * to try and save a page, but it's a pain in the behind to implement. 589 */ 590 copy_len = filsz == 0 ? 0 : (offset + filsz) - trunc_page_ps(offset + 591 filsz, pagesize); 592 map_addr = trunc_page_ps((vm_offset_t)vmaddr + filsz, pagesize); 593 map_len = round_page_ps((vm_offset_t)vmaddr + memsz, pagesize) - 594 map_addr; 595 596 /* This had damn well better be true! */ 597 if (map_len != 0) { 598 rv = __elfN(map_insert)(imgp, map, NULL, 0, map_addr, 599 map_addr + map_len, prot, 0); 600 if (rv != KERN_SUCCESS) 601 return (EINVAL); 602 } 603 604 if (copy_len != 0) { 605 sf = vm_imgact_map_page(object, offset + filsz); 606 if (sf == NULL) 607 return (EIO); 608 609 /* send the page fragment to user space */ 610 off = trunc_page_ps(offset + filsz, pagesize) - 611 trunc_page(offset + filsz); 612 error = copyout((caddr_t)sf_buf_kva(sf) + off, 613 (caddr_t)map_addr, copy_len); 614 vm_imgact_unmap_page(sf); 615 if (error != 0) 616 return (error); 617 } 618 619 /* 620 * Remove write access to the page if it was only granted by map_insert 621 * to allow copyout. 622 */ 623 if ((prot & VM_PROT_WRITE) == 0) 624 vm_map_protect(map, trunc_page(map_addr), round_page(map_addr + 625 map_len), prot, FALSE); 626 627 return (0); 628 } 629 630 /* 631 * Load the file "file" into memory. It may be either a shared object 632 * or an executable. 633 * 634 * The "addr" reference parameter is in/out. On entry, it specifies 635 * the address where a shared object should be loaded. If the file is 636 * an executable, this value is ignored. On exit, "addr" specifies 637 * where the file was actually loaded. 638 * 639 * The "entry" reference parameter is out only. On exit, it specifies 640 * the entry point for the loaded file. 641 */ 642 static int 643 __elfN(load_file)(struct proc *p, const char *file, u_long *addr, 644 u_long *entry, size_t pagesize) 645 { 646 struct { 647 struct nameidata nd; 648 struct vattr attr; 649 struct image_params image_params; 650 } *tempdata; 651 const Elf_Ehdr *hdr = NULL; 652 const Elf_Phdr *phdr = NULL; 653 struct nameidata *nd; 654 struct vattr *attr; 655 struct image_params *imgp; 656 vm_prot_t prot; 657 u_long rbase; 658 u_long base_addr = 0; 659 int error, i, numsegs; 660 661 #ifdef CAPABILITY_MODE 662 /* 663 * XXXJA: This check can go away once we are sufficiently confident 664 * that the checks in namei() are correct. 665 */ 666 if (IN_CAPABILITY_MODE(curthread)) 667 return (ECAPMODE); 668 #endif 669 670 tempdata = malloc(sizeof(*tempdata), M_TEMP, M_WAITOK); 671 nd = &tempdata->nd; 672 attr = &tempdata->attr; 673 imgp = &tempdata->image_params; 674 675 /* 676 * Initialize part of the common data 677 */ 678 imgp->proc = p; 679 imgp->attr = attr; 680 imgp->firstpage = NULL; 681 imgp->image_header = NULL; 682 imgp->object = NULL; 683 imgp->execlabel = NULL; 684 685 NDINIT(nd, LOOKUP, LOCKLEAF | FOLLOW, UIO_SYSSPACE, file, curthread); 686 if ((error = namei(nd)) != 0) { 687 nd->ni_vp = NULL; 688 goto fail; 689 } 690 NDFREE(nd, NDF_ONLY_PNBUF); 691 imgp->vp = nd->ni_vp; 692 693 /* 694 * Check permissions, modes, uid, etc on the file, and "open" it. 695 */ 696 error = exec_check_permissions(imgp); 697 if (error) 698 goto fail; 699 700 error = exec_map_first_page(imgp); 701 if (error) 702 goto fail; 703 704 /* 705 * Also make certain that the interpreter stays the same, so set 706 * its VV_TEXT flag, too. 707 */ 708 VOP_SET_TEXT(nd->ni_vp); 709 710 imgp->object = nd->ni_vp->v_object; 711 712 hdr = (const Elf_Ehdr *)imgp->image_header; 713 if ((error = __elfN(check_header)(hdr)) != 0) 714 goto fail; 715 if (hdr->e_type == ET_DYN) 716 rbase = *addr; 717 else if (hdr->e_type == ET_EXEC) 718 rbase = 0; 719 else { 720 error = ENOEXEC; 721 goto fail; 722 } 723 724 /* Only support headers that fit within first page for now */ 725 if ((hdr->e_phoff > PAGE_SIZE) || 726 (u_int)hdr->e_phentsize * hdr->e_phnum > PAGE_SIZE - hdr->e_phoff) { 727 error = ENOEXEC; 728 goto fail; 729 } 730 731 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 732 if (!aligned(phdr, Elf_Addr)) { 733 error = ENOEXEC; 734 goto fail; 735 } 736 737 for (i = 0, numsegs = 0; i < hdr->e_phnum; i++) { 738 if (phdr[i].p_type == PT_LOAD && phdr[i].p_memsz != 0) { 739 /* Loadable segment */ 740 prot = __elfN(trans_prot)(phdr[i].p_flags); 741 error = __elfN(load_section)(imgp, phdr[i].p_offset, 742 (caddr_t)(uintptr_t)phdr[i].p_vaddr + rbase, 743 phdr[i].p_memsz, phdr[i].p_filesz, prot, pagesize); 744 if (error != 0) 745 goto fail; 746 /* 747 * Establish the base address if this is the 748 * first segment. 749 */ 750 if (numsegs == 0) 751 base_addr = trunc_page(phdr[i].p_vaddr + 752 rbase); 753 numsegs++; 754 } 755 } 756 *addr = base_addr; 757 *entry = (unsigned long)hdr->e_entry + rbase; 758 759 fail: 760 if (imgp->firstpage) 761 exec_unmap_first_page(imgp); 762 763 if (nd->ni_vp) 764 vput(nd->ni_vp); 765 766 free(tempdata, M_TEMP); 767 768 return (error); 769 } 770 771 static int 772 __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp) 773 { 774 struct thread *td; 775 const Elf_Ehdr *hdr; 776 const Elf_Phdr *phdr; 777 Elf_Auxargs *elf_auxargs; 778 struct vmspace *vmspace; 779 const char *err_str, *newinterp; 780 char *interp, *interp_buf, *path; 781 Elf_Brandinfo *brand_info; 782 struct sysentvec *sv; 783 vm_prot_t prot; 784 u_long text_size, data_size, total_size, text_addr, data_addr; 785 u_long seg_size, seg_addr, addr, baddr, et_dyn_addr, entry, proghdr; 786 int32_t osrel; 787 int error, i, n, interp_name_len, have_interp; 788 789 hdr = (const Elf_Ehdr *)imgp->image_header; 790 791 /* 792 * Do we have a valid ELF header ? 793 * 794 * Only allow ET_EXEC & ET_DYN here, reject ET_DYN later 795 * if particular brand doesn't support it. 796 */ 797 if (__elfN(check_header)(hdr) != 0 || 798 (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN)) 799 return (-1); 800 801 /* 802 * From here on down, we return an errno, not -1, as we've 803 * detected an ELF file. 804 */ 805 806 if ((hdr->e_phoff > PAGE_SIZE) || 807 (u_int)hdr->e_phentsize * hdr->e_phnum > PAGE_SIZE - hdr->e_phoff) { 808 /* Only support headers in first page for now */ 809 uprintf("Program headers not in the first page\n"); 810 return (ENOEXEC); 811 } 812 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 813 if (!aligned(phdr, Elf_Addr)) { 814 uprintf("Unaligned program headers\n"); 815 return (ENOEXEC); 816 } 817 818 n = error = 0; 819 baddr = 0; 820 osrel = 0; 821 text_size = data_size = total_size = text_addr = data_addr = 0; 822 entry = proghdr = 0; 823 interp_name_len = 0; 824 err_str = newinterp = NULL; 825 interp = interp_buf = NULL; 826 td = curthread; 827 828 for (i = 0; i < hdr->e_phnum; i++) { 829 switch (phdr[i].p_type) { 830 case PT_LOAD: 831 if (n == 0) 832 baddr = phdr[i].p_vaddr; 833 n++; 834 break; 835 case PT_INTERP: 836 /* Path to interpreter */ 837 if (phdr[i].p_filesz < 2 || 838 phdr[i].p_filesz > MAXPATHLEN) { 839 uprintf("Invalid PT_INTERP\n"); 840 error = ENOEXEC; 841 goto ret; 842 } 843 if (interp != NULL) { 844 uprintf("Multiple PT_INTERP headers\n"); 845 error = ENOEXEC; 846 goto ret; 847 } 848 interp_name_len = phdr[i].p_filesz; 849 if (phdr[i].p_offset > PAGE_SIZE || 850 interp_name_len > PAGE_SIZE - phdr[i].p_offset) { 851 VOP_UNLOCK(imgp->vp, 0); 852 interp_buf = malloc(interp_name_len + 1, M_TEMP, 853 M_WAITOK); 854 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY); 855 error = vn_rdwr(UIO_READ, imgp->vp, interp_buf, 856 interp_name_len, phdr[i].p_offset, 857 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, 858 NOCRED, NULL, td); 859 if (error != 0) { 860 uprintf("i/o error PT_INTERP\n"); 861 goto ret; 862 } 863 interp_buf[interp_name_len] = '\0'; 864 interp = interp_buf; 865 } else { 866 interp = __DECONST(char *, imgp->image_header) + 867 phdr[i].p_offset; 868 if (interp[interp_name_len - 1] != '\0') { 869 uprintf("Invalid PT_INTERP\n"); 870 error = ENOEXEC; 871 goto ret; 872 } 873 } 874 break; 875 case PT_GNU_STACK: 876 if (__elfN(nxstack)) 877 imgp->stack_prot = 878 __elfN(trans_prot)(phdr[i].p_flags); 879 imgp->stack_sz = phdr[i].p_memsz; 880 break; 881 } 882 } 883 884 brand_info = __elfN(get_brandinfo)(imgp, interp, interp_name_len, 885 &osrel); 886 if (brand_info == NULL) { 887 uprintf("ELF binary type \"%u\" not known.\n", 888 hdr->e_ident[EI_OSABI]); 889 error = ENOEXEC; 890 goto ret; 891 } 892 if (hdr->e_type == ET_DYN) { 893 if ((brand_info->flags & BI_CAN_EXEC_DYN) == 0) { 894 uprintf("Cannot execute shared object\n"); 895 error = ENOEXEC; 896 goto ret; 897 } 898 /* 899 * Honour the base load address from the dso if it is 900 * non-zero for some reason. 901 */ 902 if (baddr == 0) 903 et_dyn_addr = ET_DYN_LOAD_ADDR; 904 else 905 et_dyn_addr = 0; 906 } else 907 et_dyn_addr = 0; 908 sv = brand_info->sysvec; 909 if (interp != NULL && brand_info->interp_newpath != NULL) 910 newinterp = brand_info->interp_newpath; 911 912 /* 913 * Avoid a possible deadlock if the current address space is destroyed 914 * and that address space maps the locked vnode. In the common case, 915 * the locked vnode's v_usecount is decremented but remains greater 916 * than zero. Consequently, the vnode lock is not needed by vrele(). 917 * However, in cases where the vnode lock is external, such as nullfs, 918 * v_usecount may become zero. 919 * 920 * The VV_TEXT flag prevents modifications to the executable while 921 * the vnode is unlocked. 922 */ 923 VOP_UNLOCK(imgp->vp, 0); 924 925 error = exec_new_vmspace(imgp, sv); 926 imgp->proc->p_sysent = sv; 927 928 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY); 929 if (error != 0) 930 goto ret; 931 932 for (i = 0; i < hdr->e_phnum; i++) { 933 switch (phdr[i].p_type) { 934 case PT_LOAD: /* Loadable segment */ 935 if (phdr[i].p_memsz == 0) 936 break; 937 prot = __elfN(trans_prot)(phdr[i].p_flags); 938 error = __elfN(load_section)(imgp, phdr[i].p_offset, 939 (caddr_t)(uintptr_t)phdr[i].p_vaddr + et_dyn_addr, 940 phdr[i].p_memsz, phdr[i].p_filesz, prot, 941 sv->sv_pagesize); 942 if (error != 0) 943 goto ret; 944 945 /* 946 * If this segment contains the program headers, 947 * remember their virtual address for the AT_PHDR 948 * aux entry. Static binaries don't usually include 949 * a PT_PHDR entry. 950 */ 951 if (phdr[i].p_offset == 0 && 952 hdr->e_phoff + hdr->e_phnum * hdr->e_phentsize 953 <= phdr[i].p_filesz) 954 proghdr = phdr[i].p_vaddr + hdr->e_phoff + 955 et_dyn_addr; 956 957 seg_addr = trunc_page(phdr[i].p_vaddr + et_dyn_addr); 958 seg_size = round_page(phdr[i].p_memsz + 959 phdr[i].p_vaddr + et_dyn_addr - seg_addr); 960 961 /* 962 * Make the largest executable segment the official 963 * text segment and all others data. 964 * 965 * Note that obreak() assumes that data_addr + 966 * data_size == end of data load area, and the ELF 967 * file format expects segments to be sorted by 968 * address. If multiple data segments exist, the 969 * last one will be used. 970 */ 971 972 if (phdr[i].p_flags & PF_X && text_size < seg_size) { 973 text_size = seg_size; 974 text_addr = seg_addr; 975 } else { 976 data_size = seg_size; 977 data_addr = seg_addr; 978 } 979 total_size += seg_size; 980 break; 981 case PT_PHDR: /* Program header table info */ 982 proghdr = phdr[i].p_vaddr + et_dyn_addr; 983 break; 984 default: 985 break; 986 } 987 } 988 989 if (data_addr == 0 && data_size == 0) { 990 data_addr = text_addr; 991 data_size = text_size; 992 } 993 994 entry = (u_long)hdr->e_entry + et_dyn_addr; 995 996 /* 997 * Check limits. It should be safe to check the 998 * limits after loading the segments since we do 999 * not actually fault in all the segments pages. 1000 */ 1001 PROC_LOCK(imgp->proc); 1002 if (data_size > lim_cur_proc(imgp->proc, RLIMIT_DATA)) 1003 err_str = "Data segment size exceeds process limit"; 1004 else if (text_size > maxtsiz) 1005 err_str = "Text segment size exceeds system limit"; 1006 else if (total_size > lim_cur_proc(imgp->proc, RLIMIT_VMEM)) 1007 err_str = "Total segment size exceeds process limit"; 1008 else if (racct_set(imgp->proc, RACCT_DATA, data_size) != 0) 1009 err_str = "Data segment size exceeds resource limit"; 1010 else if (racct_set(imgp->proc, RACCT_VMEM, total_size) != 0) 1011 err_str = "Total segment size exceeds resource limit"; 1012 if (err_str != NULL) { 1013 PROC_UNLOCK(imgp->proc); 1014 uprintf("%s\n", err_str); 1015 error = ENOMEM; 1016 goto ret; 1017 } 1018 1019 vmspace = imgp->proc->p_vmspace; 1020 vmspace->vm_tsize = text_size >> PAGE_SHIFT; 1021 vmspace->vm_taddr = (caddr_t)(uintptr_t)text_addr; 1022 vmspace->vm_dsize = data_size >> PAGE_SHIFT; 1023 vmspace->vm_daddr = (caddr_t)(uintptr_t)data_addr; 1024 1025 /* 1026 * We load the dynamic linker where a userland call 1027 * to mmap(0, ...) would put it. The rationale behind this 1028 * calculation is that it leaves room for the heap to grow to 1029 * its maximum allowed size. 1030 */ 1031 addr = round_page((vm_offset_t)vmspace->vm_daddr + lim_max(td, 1032 RLIMIT_DATA)); 1033 PROC_UNLOCK(imgp->proc); 1034 1035 imgp->entry_addr = entry; 1036 1037 if (interp != NULL) { 1038 have_interp = FALSE; 1039 VOP_UNLOCK(imgp->vp, 0); 1040 if (brand_info->emul_path != NULL && 1041 brand_info->emul_path[0] != '\0') { 1042 path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 1043 snprintf(path, MAXPATHLEN, "%s%s", 1044 brand_info->emul_path, interp); 1045 error = __elfN(load_file)(imgp->proc, path, &addr, 1046 &imgp->entry_addr, sv->sv_pagesize); 1047 free(path, M_TEMP); 1048 if (error == 0) 1049 have_interp = TRUE; 1050 } 1051 if (!have_interp && newinterp != NULL && 1052 (brand_info->interp_path == NULL || 1053 strcmp(interp, brand_info->interp_path) == 0)) { 1054 error = __elfN(load_file)(imgp->proc, newinterp, &addr, 1055 &imgp->entry_addr, sv->sv_pagesize); 1056 if (error == 0) 1057 have_interp = TRUE; 1058 } 1059 if (!have_interp) { 1060 error = __elfN(load_file)(imgp->proc, interp, &addr, 1061 &imgp->entry_addr, sv->sv_pagesize); 1062 } 1063 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY); 1064 if (error != 0) { 1065 uprintf("ELF interpreter %s not found, error %d\n", 1066 interp, error); 1067 goto ret; 1068 } 1069 } else 1070 addr = et_dyn_addr; 1071 1072 /* 1073 * Construct auxargs table (used by the fixup routine) 1074 */ 1075 elf_auxargs = malloc(sizeof(Elf_Auxargs), M_TEMP, M_WAITOK); 1076 elf_auxargs->execfd = -1; 1077 elf_auxargs->phdr = proghdr; 1078 elf_auxargs->phent = hdr->e_phentsize; 1079 elf_auxargs->phnum = hdr->e_phnum; 1080 elf_auxargs->pagesz = PAGE_SIZE; 1081 elf_auxargs->base = addr; 1082 elf_auxargs->flags = 0; 1083 elf_auxargs->entry = entry; 1084 elf_auxargs->hdr_eflags = hdr->e_flags; 1085 1086 imgp->auxargs = elf_auxargs; 1087 imgp->interpreted = 0; 1088 imgp->reloc_base = addr; 1089 imgp->proc->p_osrel = osrel; 1090 imgp->proc->p_elf_machine = hdr->e_machine; 1091 imgp->proc->p_elf_flags = hdr->e_flags; 1092 1093 ret: 1094 free(interp_buf, M_TEMP); 1095 return (error); 1096 } 1097 1098 #define suword __CONCAT(suword, __ELF_WORD_SIZE) 1099 1100 int 1101 __elfN(freebsd_fixup)(register_t **stack_base, struct image_params *imgp) 1102 { 1103 Elf_Auxargs *args = (Elf_Auxargs *)imgp->auxargs; 1104 Elf_Addr *base; 1105 Elf_Addr *pos; 1106 1107 base = (Elf_Addr *)*stack_base; 1108 pos = base + (imgp->args->argc + imgp->args->envc + 2); 1109 1110 if (args->execfd != -1) 1111 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd); 1112 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr); 1113 AUXARGS_ENTRY(pos, AT_PHENT, args->phent); 1114 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum); 1115 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz); 1116 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags); 1117 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry); 1118 AUXARGS_ENTRY(pos, AT_BASE, args->base); 1119 #ifdef AT_EHDRFLAGS 1120 AUXARGS_ENTRY(pos, AT_EHDRFLAGS, args->hdr_eflags); 1121 #endif 1122 if (imgp->execpathp != 0) 1123 AUXARGS_ENTRY(pos, AT_EXECPATH, imgp->execpathp); 1124 AUXARGS_ENTRY(pos, AT_OSRELDATE, 1125 imgp->proc->p_ucred->cr_prison->pr_osreldate); 1126 if (imgp->canary != 0) { 1127 AUXARGS_ENTRY(pos, AT_CANARY, imgp->canary); 1128 AUXARGS_ENTRY(pos, AT_CANARYLEN, imgp->canarylen); 1129 } 1130 AUXARGS_ENTRY(pos, AT_NCPUS, mp_ncpus); 1131 if (imgp->pagesizes != 0) { 1132 AUXARGS_ENTRY(pos, AT_PAGESIZES, imgp->pagesizes); 1133 AUXARGS_ENTRY(pos, AT_PAGESIZESLEN, imgp->pagesizeslen); 1134 } 1135 if (imgp->sysent->sv_timekeep_base != 0) { 1136 AUXARGS_ENTRY(pos, AT_TIMEKEEP, 1137 imgp->sysent->sv_timekeep_base); 1138 } 1139 AUXARGS_ENTRY(pos, AT_STACKPROT, imgp->sysent->sv_shared_page_obj 1140 != NULL && imgp->stack_prot != 0 ? imgp->stack_prot : 1141 imgp->sysent->sv_stackprot); 1142 AUXARGS_ENTRY(pos, AT_NULL, 0); 1143 1144 free(imgp->auxargs, M_TEMP); 1145 imgp->auxargs = NULL; 1146 1147 base--; 1148 suword(base, (long)imgp->args->argc); 1149 *stack_base = (register_t *)base; 1150 return (0); 1151 } 1152 1153 /* 1154 * Code for generating ELF core dumps. 1155 */ 1156 1157 typedef void (*segment_callback)(vm_map_entry_t, void *); 1158 1159 /* Closure for cb_put_phdr(). */ 1160 struct phdr_closure { 1161 Elf_Phdr *phdr; /* Program header to fill in */ 1162 Elf_Off offset; /* Offset of segment in core file */ 1163 }; 1164 1165 /* Closure for cb_size_segment(). */ 1166 struct sseg_closure { 1167 int count; /* Count of writable segments. */ 1168 size_t size; /* Total size of all writable segments. */ 1169 }; 1170 1171 typedef void (*outfunc_t)(void *, struct sbuf *, size_t *); 1172 1173 struct note_info { 1174 int type; /* Note type. */ 1175 outfunc_t outfunc; /* Output function. */ 1176 void *outarg; /* Argument for the output function. */ 1177 size_t outsize; /* Output size. */ 1178 TAILQ_ENTRY(note_info) link; /* Link to the next note info. */ 1179 }; 1180 1181 TAILQ_HEAD(note_info_list, note_info); 1182 1183 /* Coredump output parameters. */ 1184 struct coredump_params { 1185 off_t offset; 1186 struct ucred *active_cred; 1187 struct ucred *file_cred; 1188 struct thread *td; 1189 struct vnode *vp; 1190 struct gzio_stream *gzs; 1191 }; 1192 1193 static void cb_put_phdr(vm_map_entry_t, void *); 1194 static void cb_size_segment(vm_map_entry_t, void *); 1195 static int core_write(struct coredump_params *, const void *, size_t, off_t, 1196 enum uio_seg); 1197 static void each_writable_segment(struct thread *, segment_callback, void *); 1198 static int __elfN(corehdr)(struct coredump_params *, int, void *, size_t, 1199 struct note_info_list *, size_t); 1200 static void __elfN(prepare_notes)(struct thread *, struct note_info_list *, 1201 size_t *); 1202 static void __elfN(puthdr)(struct thread *, void *, size_t, int, size_t); 1203 static void __elfN(putnote)(struct note_info *, struct sbuf *); 1204 static size_t register_note(struct note_info_list *, int, outfunc_t, void *); 1205 static int sbuf_drain_core_output(void *, const char *, int); 1206 static int sbuf_drain_count(void *arg, const char *data, int len); 1207 1208 static void __elfN(note_fpregset)(void *, struct sbuf *, size_t *); 1209 static void __elfN(note_prpsinfo)(void *, struct sbuf *, size_t *); 1210 static void __elfN(note_prstatus)(void *, struct sbuf *, size_t *); 1211 static void __elfN(note_threadmd)(void *, struct sbuf *, size_t *); 1212 static void __elfN(note_thrmisc)(void *, struct sbuf *, size_t *); 1213 static void __elfN(note_procstat_auxv)(void *, struct sbuf *, size_t *); 1214 static void __elfN(note_procstat_proc)(void *, struct sbuf *, size_t *); 1215 static void __elfN(note_procstat_psstrings)(void *, struct sbuf *, size_t *); 1216 static void note_procstat_files(void *, struct sbuf *, size_t *); 1217 static void note_procstat_groups(void *, struct sbuf *, size_t *); 1218 static void note_procstat_osrel(void *, struct sbuf *, size_t *); 1219 static void note_procstat_rlimit(void *, struct sbuf *, size_t *); 1220 static void note_procstat_umask(void *, struct sbuf *, size_t *); 1221 static void note_procstat_vmmap(void *, struct sbuf *, size_t *); 1222 1223 #ifdef GZIO 1224 extern int compress_user_cores_gzlevel; 1225 1226 /* 1227 * Write out a core segment to the compression stream. 1228 */ 1229 static int 1230 compress_chunk(struct coredump_params *p, char *base, char *buf, u_int len) 1231 { 1232 u_int chunk_len; 1233 int error; 1234 1235 while (len > 0) { 1236 chunk_len = MIN(len, CORE_BUF_SIZE); 1237 1238 /* 1239 * We can get EFAULT error here. 1240 * In that case zero out the current chunk of the segment. 1241 */ 1242 error = copyin(base, buf, chunk_len); 1243 if (error != 0) 1244 bzero(buf, chunk_len); 1245 error = gzio_write(p->gzs, buf, chunk_len); 1246 if (error != 0) 1247 break; 1248 base += chunk_len; 1249 len -= chunk_len; 1250 } 1251 return (error); 1252 } 1253 1254 static int 1255 core_gz_write(void *base, size_t len, off_t offset, void *arg) 1256 { 1257 1258 return (core_write((struct coredump_params *)arg, base, len, offset, 1259 UIO_SYSSPACE)); 1260 } 1261 #endif /* GZIO */ 1262 1263 static int 1264 core_write(struct coredump_params *p, const void *base, size_t len, 1265 off_t offset, enum uio_seg seg) 1266 { 1267 1268 return (vn_rdwr_inchunks(UIO_WRITE, p->vp, __DECONST(void *, base), 1269 len, offset, seg, IO_UNIT | IO_DIRECT | IO_RANGELOCKED, 1270 p->active_cred, p->file_cred, NULL, p->td)); 1271 } 1272 1273 static int 1274 core_output(void *base, size_t len, off_t offset, struct coredump_params *p, 1275 void *tmpbuf) 1276 { 1277 int error; 1278 1279 #ifdef GZIO 1280 if (p->gzs != NULL) 1281 return (compress_chunk(p, base, tmpbuf, len)); 1282 #endif 1283 /* 1284 * EFAULT is a non-fatal error that we can get, for example, 1285 * if the segment is backed by a file but extends beyond its 1286 * end. 1287 */ 1288 error = core_write(p, base, len, offset, UIO_USERSPACE); 1289 if (error == EFAULT) { 1290 log(LOG_WARNING, "Failed to fully fault in a core file segment " 1291 "at VA %p with size 0x%zx to be written at offset 0x%jx " 1292 "for process %s\n", base, len, offset, curproc->p_comm); 1293 1294 /* 1295 * Write a "real" zero byte at the end of the target region 1296 * in the case this is the last segment. 1297 * The intermediate space will be implicitly zero-filled. 1298 */ 1299 error = core_write(p, zero_region, 1, offset + len - 1, 1300 UIO_SYSSPACE); 1301 } 1302 return (error); 1303 } 1304 1305 /* 1306 * Drain into a core file. 1307 */ 1308 static int 1309 sbuf_drain_core_output(void *arg, const char *data, int len) 1310 { 1311 struct coredump_params *p; 1312 int error, locked; 1313 1314 p = (struct coredump_params *)arg; 1315 1316 /* 1317 * Some kern_proc out routines that print to this sbuf may 1318 * call us with the process lock held. Draining with the 1319 * non-sleepable lock held is unsafe. The lock is needed for 1320 * those routines when dumping a live process. In our case we 1321 * can safely release the lock before draining and acquire 1322 * again after. 1323 */ 1324 locked = PROC_LOCKED(p->td->td_proc); 1325 if (locked) 1326 PROC_UNLOCK(p->td->td_proc); 1327 #ifdef GZIO 1328 if (p->gzs != NULL) 1329 error = gzio_write(p->gzs, __DECONST(char *, data), len); 1330 else 1331 #endif 1332 error = core_write(p, __DECONST(void *, data), len, p->offset, 1333 UIO_SYSSPACE); 1334 if (locked) 1335 PROC_LOCK(p->td->td_proc); 1336 if (error != 0) 1337 return (-error); 1338 p->offset += len; 1339 return (len); 1340 } 1341 1342 /* 1343 * Drain into a counter. 1344 */ 1345 static int 1346 sbuf_drain_count(void *arg, const char *data __unused, int len) 1347 { 1348 size_t *sizep; 1349 1350 sizep = (size_t *)arg; 1351 *sizep += len; 1352 return (len); 1353 } 1354 1355 int 1356 __elfN(coredump)(struct thread *td, struct vnode *vp, off_t limit, int flags) 1357 { 1358 struct ucred *cred = td->td_ucred; 1359 int error = 0; 1360 struct sseg_closure seginfo; 1361 struct note_info_list notelst; 1362 struct coredump_params params; 1363 struct note_info *ninfo; 1364 void *hdr, *tmpbuf; 1365 size_t hdrsize, notesz, coresize; 1366 #ifdef GZIO 1367 boolean_t compress; 1368 1369 compress = (flags & IMGACT_CORE_COMPRESS) != 0; 1370 #endif 1371 hdr = NULL; 1372 tmpbuf = NULL; 1373 TAILQ_INIT(¬elst); 1374 1375 /* Size the program segments. */ 1376 seginfo.count = 0; 1377 seginfo.size = 0; 1378 each_writable_segment(td, cb_size_segment, &seginfo); 1379 1380 /* 1381 * Collect info about the core file header area. 1382 */ 1383 hdrsize = sizeof(Elf_Ehdr) + sizeof(Elf_Phdr) * (1 + seginfo.count); 1384 __elfN(prepare_notes)(td, ¬elst, ¬esz); 1385 coresize = round_page(hdrsize + notesz) + seginfo.size; 1386 1387 /* Set up core dump parameters. */ 1388 params.offset = 0; 1389 params.active_cred = cred; 1390 params.file_cred = NOCRED; 1391 params.td = td; 1392 params.vp = vp; 1393 params.gzs = NULL; 1394 1395 #ifdef RACCT 1396 if (racct_enable) { 1397 PROC_LOCK(td->td_proc); 1398 error = racct_add(td->td_proc, RACCT_CORE, coresize); 1399 PROC_UNLOCK(td->td_proc); 1400 if (error != 0) { 1401 error = EFAULT; 1402 goto done; 1403 } 1404 } 1405 #endif 1406 if (coresize >= limit) { 1407 error = EFAULT; 1408 goto done; 1409 } 1410 1411 #ifdef GZIO 1412 /* Create a compression stream if necessary. */ 1413 if (compress) { 1414 params.gzs = gzio_init(core_gz_write, GZIO_DEFLATE, 1415 CORE_BUF_SIZE, compress_user_cores_gzlevel, ¶ms); 1416 if (params.gzs == NULL) { 1417 error = EFAULT; 1418 goto done; 1419 } 1420 tmpbuf = malloc(CORE_BUF_SIZE, M_TEMP, M_WAITOK | M_ZERO); 1421 } 1422 #endif 1423 1424 /* 1425 * Allocate memory for building the header, fill it up, 1426 * and write it out following the notes. 1427 */ 1428 hdr = malloc(hdrsize, M_TEMP, M_WAITOK); 1429 error = __elfN(corehdr)(¶ms, seginfo.count, hdr, hdrsize, ¬elst, 1430 notesz); 1431 1432 /* Write the contents of all of the writable segments. */ 1433 if (error == 0) { 1434 Elf_Phdr *php; 1435 off_t offset; 1436 int i; 1437 1438 php = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr)) + 1; 1439 offset = round_page(hdrsize + notesz); 1440 for (i = 0; i < seginfo.count; i++) { 1441 error = core_output((caddr_t)(uintptr_t)php->p_vaddr, 1442 php->p_filesz, offset, ¶ms, tmpbuf); 1443 if (error != 0) 1444 break; 1445 offset += php->p_filesz; 1446 php++; 1447 } 1448 #ifdef GZIO 1449 if (error == 0 && compress) 1450 error = gzio_flush(params.gzs); 1451 #endif 1452 } 1453 if (error) { 1454 log(LOG_WARNING, 1455 "Failed to write core file for process %s (error %d)\n", 1456 curproc->p_comm, error); 1457 } 1458 1459 done: 1460 #ifdef GZIO 1461 if (compress) { 1462 free(tmpbuf, M_TEMP); 1463 if (params.gzs != NULL) 1464 gzio_fini(params.gzs); 1465 } 1466 #endif 1467 while ((ninfo = TAILQ_FIRST(¬elst)) != NULL) { 1468 TAILQ_REMOVE(¬elst, ninfo, link); 1469 free(ninfo, M_TEMP); 1470 } 1471 if (hdr != NULL) 1472 free(hdr, M_TEMP); 1473 1474 return (error); 1475 } 1476 1477 /* 1478 * A callback for each_writable_segment() to write out the segment's 1479 * program header entry. 1480 */ 1481 static void 1482 cb_put_phdr(entry, closure) 1483 vm_map_entry_t entry; 1484 void *closure; 1485 { 1486 struct phdr_closure *phc = (struct phdr_closure *)closure; 1487 Elf_Phdr *phdr = phc->phdr; 1488 1489 phc->offset = round_page(phc->offset); 1490 1491 phdr->p_type = PT_LOAD; 1492 phdr->p_offset = phc->offset; 1493 phdr->p_vaddr = entry->start; 1494 phdr->p_paddr = 0; 1495 phdr->p_filesz = phdr->p_memsz = entry->end - entry->start; 1496 phdr->p_align = PAGE_SIZE; 1497 phdr->p_flags = __elfN(untrans_prot)(entry->protection); 1498 1499 phc->offset += phdr->p_filesz; 1500 phc->phdr++; 1501 } 1502 1503 /* 1504 * A callback for each_writable_segment() to gather information about 1505 * the number of segments and their total size. 1506 */ 1507 static void 1508 cb_size_segment(entry, closure) 1509 vm_map_entry_t entry; 1510 void *closure; 1511 { 1512 struct sseg_closure *ssc = (struct sseg_closure *)closure; 1513 1514 ssc->count++; 1515 ssc->size += entry->end - entry->start; 1516 } 1517 1518 /* 1519 * For each writable segment in the process's memory map, call the given 1520 * function with a pointer to the map entry and some arbitrary 1521 * caller-supplied data. 1522 */ 1523 static void 1524 each_writable_segment(td, func, closure) 1525 struct thread *td; 1526 segment_callback func; 1527 void *closure; 1528 { 1529 struct proc *p = td->td_proc; 1530 vm_map_t map = &p->p_vmspace->vm_map; 1531 vm_map_entry_t entry; 1532 vm_object_t backing_object, object; 1533 boolean_t ignore_entry; 1534 1535 vm_map_lock_read(map); 1536 for (entry = map->header.next; entry != &map->header; 1537 entry = entry->next) { 1538 /* 1539 * Don't dump inaccessible mappings, deal with legacy 1540 * coredump mode. 1541 * 1542 * Note that read-only segments related to the elf binary 1543 * are marked MAP_ENTRY_NOCOREDUMP now so we no longer 1544 * need to arbitrarily ignore such segments. 1545 */ 1546 if (elf_legacy_coredump) { 1547 if ((entry->protection & VM_PROT_RW) != VM_PROT_RW) 1548 continue; 1549 } else { 1550 if ((entry->protection & VM_PROT_ALL) == 0) 1551 continue; 1552 } 1553 1554 /* 1555 * Dont include memory segment in the coredump if 1556 * MAP_NOCORE is set in mmap(2) or MADV_NOCORE in 1557 * madvise(2). Do not dump submaps (i.e. parts of the 1558 * kernel map). 1559 */ 1560 if (entry->eflags & (MAP_ENTRY_NOCOREDUMP|MAP_ENTRY_IS_SUB_MAP)) 1561 continue; 1562 1563 if ((object = entry->object.vm_object) == NULL) 1564 continue; 1565 1566 /* Ignore memory-mapped devices and such things. */ 1567 VM_OBJECT_RLOCK(object); 1568 while ((backing_object = object->backing_object) != NULL) { 1569 VM_OBJECT_RLOCK(backing_object); 1570 VM_OBJECT_RUNLOCK(object); 1571 object = backing_object; 1572 } 1573 ignore_entry = object->type != OBJT_DEFAULT && 1574 object->type != OBJT_SWAP && object->type != OBJT_VNODE && 1575 object->type != OBJT_PHYS; 1576 VM_OBJECT_RUNLOCK(object); 1577 if (ignore_entry) 1578 continue; 1579 1580 (*func)(entry, closure); 1581 } 1582 vm_map_unlock_read(map); 1583 } 1584 1585 /* 1586 * Write the core file header to the file, including padding up to 1587 * the page boundary. 1588 */ 1589 static int 1590 __elfN(corehdr)(struct coredump_params *p, int numsegs, void *hdr, 1591 size_t hdrsize, struct note_info_list *notelst, size_t notesz) 1592 { 1593 struct note_info *ninfo; 1594 struct sbuf *sb; 1595 int error; 1596 1597 /* Fill in the header. */ 1598 bzero(hdr, hdrsize); 1599 __elfN(puthdr)(p->td, hdr, hdrsize, numsegs, notesz); 1600 1601 sb = sbuf_new(NULL, NULL, CORE_BUF_SIZE, SBUF_FIXEDLEN); 1602 sbuf_set_drain(sb, sbuf_drain_core_output, p); 1603 sbuf_start_section(sb, NULL); 1604 sbuf_bcat(sb, hdr, hdrsize); 1605 TAILQ_FOREACH(ninfo, notelst, link) 1606 __elfN(putnote)(ninfo, sb); 1607 /* Align up to a page boundary for the program segments. */ 1608 sbuf_end_section(sb, -1, PAGE_SIZE, 0); 1609 error = sbuf_finish(sb); 1610 sbuf_delete(sb); 1611 1612 return (error); 1613 } 1614 1615 static void 1616 __elfN(prepare_notes)(struct thread *td, struct note_info_list *list, 1617 size_t *sizep) 1618 { 1619 struct proc *p; 1620 struct thread *thr; 1621 size_t size; 1622 1623 p = td->td_proc; 1624 size = 0; 1625 1626 size += register_note(list, NT_PRPSINFO, __elfN(note_prpsinfo), p); 1627 1628 /* 1629 * To have the debugger select the right thread (LWP) as the initial 1630 * thread, we dump the state of the thread passed to us in td first. 1631 * This is the thread that causes the core dump and thus likely to 1632 * be the right thread one wants to have selected in the debugger. 1633 */ 1634 thr = td; 1635 while (thr != NULL) { 1636 size += register_note(list, NT_PRSTATUS, 1637 __elfN(note_prstatus), thr); 1638 size += register_note(list, NT_FPREGSET, 1639 __elfN(note_fpregset), thr); 1640 size += register_note(list, NT_THRMISC, 1641 __elfN(note_thrmisc), thr); 1642 size += register_note(list, -1, 1643 __elfN(note_threadmd), thr); 1644 1645 thr = (thr == td) ? TAILQ_FIRST(&p->p_threads) : 1646 TAILQ_NEXT(thr, td_plist); 1647 if (thr == td) 1648 thr = TAILQ_NEXT(thr, td_plist); 1649 } 1650 1651 size += register_note(list, NT_PROCSTAT_PROC, 1652 __elfN(note_procstat_proc), p); 1653 size += register_note(list, NT_PROCSTAT_FILES, 1654 note_procstat_files, p); 1655 size += register_note(list, NT_PROCSTAT_VMMAP, 1656 note_procstat_vmmap, p); 1657 size += register_note(list, NT_PROCSTAT_GROUPS, 1658 note_procstat_groups, p); 1659 size += register_note(list, NT_PROCSTAT_UMASK, 1660 note_procstat_umask, p); 1661 size += register_note(list, NT_PROCSTAT_RLIMIT, 1662 note_procstat_rlimit, p); 1663 size += register_note(list, NT_PROCSTAT_OSREL, 1664 note_procstat_osrel, p); 1665 size += register_note(list, NT_PROCSTAT_PSSTRINGS, 1666 __elfN(note_procstat_psstrings), p); 1667 size += register_note(list, NT_PROCSTAT_AUXV, 1668 __elfN(note_procstat_auxv), p); 1669 1670 *sizep = size; 1671 } 1672 1673 static void 1674 __elfN(puthdr)(struct thread *td, void *hdr, size_t hdrsize, int numsegs, 1675 size_t notesz) 1676 { 1677 Elf_Ehdr *ehdr; 1678 Elf_Phdr *phdr; 1679 struct phdr_closure phc; 1680 1681 ehdr = (Elf_Ehdr *)hdr; 1682 phdr = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr)); 1683 1684 ehdr->e_ident[EI_MAG0] = ELFMAG0; 1685 ehdr->e_ident[EI_MAG1] = ELFMAG1; 1686 ehdr->e_ident[EI_MAG2] = ELFMAG2; 1687 ehdr->e_ident[EI_MAG3] = ELFMAG3; 1688 ehdr->e_ident[EI_CLASS] = ELF_CLASS; 1689 ehdr->e_ident[EI_DATA] = ELF_DATA; 1690 ehdr->e_ident[EI_VERSION] = EV_CURRENT; 1691 ehdr->e_ident[EI_OSABI] = ELFOSABI_FREEBSD; 1692 ehdr->e_ident[EI_ABIVERSION] = 0; 1693 ehdr->e_ident[EI_PAD] = 0; 1694 ehdr->e_type = ET_CORE; 1695 ehdr->e_machine = td->td_proc->p_elf_machine; 1696 ehdr->e_version = EV_CURRENT; 1697 ehdr->e_entry = 0; 1698 ehdr->e_phoff = sizeof(Elf_Ehdr); 1699 ehdr->e_flags = td->td_proc->p_elf_flags; 1700 ehdr->e_ehsize = sizeof(Elf_Ehdr); 1701 ehdr->e_phentsize = sizeof(Elf_Phdr); 1702 ehdr->e_phnum = numsegs + 1; 1703 ehdr->e_shentsize = sizeof(Elf_Shdr); 1704 ehdr->e_shnum = 0; 1705 ehdr->e_shstrndx = SHN_UNDEF; 1706 1707 /* 1708 * Fill in the program header entries. 1709 */ 1710 1711 /* The note segement. */ 1712 phdr->p_type = PT_NOTE; 1713 phdr->p_offset = hdrsize; 1714 phdr->p_vaddr = 0; 1715 phdr->p_paddr = 0; 1716 phdr->p_filesz = notesz; 1717 phdr->p_memsz = 0; 1718 phdr->p_flags = PF_R; 1719 phdr->p_align = ELF_NOTE_ROUNDSIZE; 1720 phdr++; 1721 1722 /* All the writable segments from the program. */ 1723 phc.phdr = phdr; 1724 phc.offset = round_page(hdrsize + notesz); 1725 each_writable_segment(td, cb_put_phdr, &phc); 1726 } 1727 1728 static size_t 1729 register_note(struct note_info_list *list, int type, outfunc_t out, void *arg) 1730 { 1731 struct note_info *ninfo; 1732 size_t size, notesize; 1733 1734 size = 0; 1735 out(arg, NULL, &size); 1736 ninfo = malloc(sizeof(*ninfo), M_TEMP, M_ZERO | M_WAITOK); 1737 ninfo->type = type; 1738 ninfo->outfunc = out; 1739 ninfo->outarg = arg; 1740 ninfo->outsize = size; 1741 TAILQ_INSERT_TAIL(list, ninfo, link); 1742 1743 if (type == -1) 1744 return (size); 1745 1746 notesize = sizeof(Elf_Note) + /* note header */ 1747 roundup2(sizeof(FREEBSD_ABI_VENDOR), ELF_NOTE_ROUNDSIZE) + 1748 /* note name */ 1749 roundup2(size, ELF_NOTE_ROUNDSIZE); /* note description */ 1750 1751 return (notesize); 1752 } 1753 1754 static size_t 1755 append_note_data(const void *src, void *dst, size_t len) 1756 { 1757 size_t padded_len; 1758 1759 padded_len = roundup2(len, ELF_NOTE_ROUNDSIZE); 1760 if (dst != NULL) { 1761 bcopy(src, dst, len); 1762 bzero((char *)dst + len, padded_len - len); 1763 } 1764 return (padded_len); 1765 } 1766 1767 size_t 1768 __elfN(populate_note)(int type, void *src, void *dst, size_t size, void **descp) 1769 { 1770 Elf_Note *note; 1771 char *buf; 1772 size_t notesize; 1773 1774 buf = dst; 1775 if (buf != NULL) { 1776 note = (Elf_Note *)buf; 1777 note->n_namesz = sizeof(FREEBSD_ABI_VENDOR); 1778 note->n_descsz = size; 1779 note->n_type = type; 1780 buf += sizeof(*note); 1781 buf += append_note_data(FREEBSD_ABI_VENDOR, buf, 1782 sizeof(FREEBSD_ABI_VENDOR)); 1783 append_note_data(src, buf, size); 1784 if (descp != NULL) 1785 *descp = buf; 1786 } 1787 1788 notesize = sizeof(Elf_Note) + /* note header */ 1789 roundup2(sizeof(FREEBSD_ABI_VENDOR), ELF_NOTE_ROUNDSIZE) + 1790 /* note name */ 1791 roundup2(size, ELF_NOTE_ROUNDSIZE); /* note description */ 1792 1793 return (notesize); 1794 } 1795 1796 static void 1797 __elfN(putnote)(struct note_info *ninfo, struct sbuf *sb) 1798 { 1799 Elf_Note note; 1800 ssize_t old_len, sect_len; 1801 size_t new_len, descsz, i; 1802 1803 if (ninfo->type == -1) { 1804 ninfo->outfunc(ninfo->outarg, sb, &ninfo->outsize); 1805 return; 1806 } 1807 1808 note.n_namesz = sizeof(FREEBSD_ABI_VENDOR); 1809 note.n_descsz = ninfo->outsize; 1810 note.n_type = ninfo->type; 1811 1812 sbuf_bcat(sb, ¬e, sizeof(note)); 1813 sbuf_start_section(sb, &old_len); 1814 sbuf_bcat(sb, FREEBSD_ABI_VENDOR, sizeof(FREEBSD_ABI_VENDOR)); 1815 sbuf_end_section(sb, old_len, ELF_NOTE_ROUNDSIZE, 0); 1816 if (note.n_descsz == 0) 1817 return; 1818 sbuf_start_section(sb, &old_len); 1819 ninfo->outfunc(ninfo->outarg, sb, &ninfo->outsize); 1820 sect_len = sbuf_end_section(sb, old_len, ELF_NOTE_ROUNDSIZE, 0); 1821 if (sect_len < 0) 1822 return; 1823 1824 new_len = (size_t)sect_len; 1825 descsz = roundup(note.n_descsz, ELF_NOTE_ROUNDSIZE); 1826 if (new_len < descsz) { 1827 /* 1828 * It is expected that individual note emitters will correctly 1829 * predict their expected output size and fill up to that size 1830 * themselves, padding in a format-specific way if needed. 1831 * However, in case they don't, just do it here with zeros. 1832 */ 1833 for (i = 0; i < descsz - new_len; i++) 1834 sbuf_putc(sb, 0); 1835 } else if (new_len > descsz) { 1836 /* 1837 * We can't always truncate sb -- we may have drained some 1838 * of it already. 1839 */ 1840 KASSERT(new_len == descsz, ("%s: Note type %u changed as we " 1841 "read it (%zu > %zu). Since it is longer than " 1842 "expected, this coredump's notes are corrupt. THIS " 1843 "IS A BUG in the note_procstat routine for type %u.\n", 1844 __func__, (unsigned)note.n_type, new_len, descsz, 1845 (unsigned)note.n_type)); 1846 } 1847 } 1848 1849 /* 1850 * Miscellaneous note out functions. 1851 */ 1852 1853 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 1854 #include <compat/freebsd32/freebsd32.h> 1855 1856 typedef struct prstatus32 elf_prstatus_t; 1857 typedef struct prpsinfo32 elf_prpsinfo_t; 1858 typedef struct fpreg32 elf_prfpregset_t; 1859 typedef struct fpreg32 elf_fpregset_t; 1860 typedef struct reg32 elf_gregset_t; 1861 typedef struct thrmisc32 elf_thrmisc_t; 1862 #define ELF_KERN_PROC_MASK KERN_PROC_MASK32 1863 typedef struct kinfo_proc32 elf_kinfo_proc_t; 1864 typedef uint32_t elf_ps_strings_t; 1865 #else 1866 typedef prstatus_t elf_prstatus_t; 1867 typedef prpsinfo_t elf_prpsinfo_t; 1868 typedef prfpregset_t elf_prfpregset_t; 1869 typedef prfpregset_t elf_fpregset_t; 1870 typedef gregset_t elf_gregset_t; 1871 typedef thrmisc_t elf_thrmisc_t; 1872 #define ELF_KERN_PROC_MASK 0 1873 typedef struct kinfo_proc elf_kinfo_proc_t; 1874 typedef vm_offset_t elf_ps_strings_t; 1875 #endif 1876 1877 static void 1878 __elfN(note_prpsinfo)(void *arg, struct sbuf *sb, size_t *sizep) 1879 { 1880 struct sbuf sbarg; 1881 size_t len; 1882 char *cp, *end; 1883 struct proc *p; 1884 elf_prpsinfo_t *psinfo; 1885 int error; 1886 1887 p = (struct proc *)arg; 1888 if (sb != NULL) { 1889 KASSERT(*sizep == sizeof(*psinfo), ("invalid size")); 1890 psinfo = malloc(sizeof(*psinfo), M_TEMP, M_ZERO | M_WAITOK); 1891 psinfo->pr_version = PRPSINFO_VERSION; 1892 psinfo->pr_psinfosz = sizeof(elf_prpsinfo_t); 1893 strlcpy(psinfo->pr_fname, p->p_comm, sizeof(psinfo->pr_fname)); 1894 PROC_LOCK(p); 1895 if (p->p_args != NULL) { 1896 len = sizeof(psinfo->pr_psargs) - 1; 1897 if (len > p->p_args->ar_length) 1898 len = p->p_args->ar_length; 1899 memcpy(psinfo->pr_psargs, p->p_args->ar_args, len); 1900 PROC_UNLOCK(p); 1901 error = 0; 1902 } else { 1903 _PHOLD(p); 1904 PROC_UNLOCK(p); 1905 sbuf_new(&sbarg, psinfo->pr_psargs, 1906 sizeof(psinfo->pr_psargs), SBUF_FIXEDLEN); 1907 error = proc_getargv(curthread, p, &sbarg); 1908 PRELE(p); 1909 if (sbuf_finish(&sbarg) == 0) 1910 len = sbuf_len(&sbarg) - 1; 1911 else 1912 len = sizeof(psinfo->pr_psargs) - 1; 1913 sbuf_delete(&sbarg); 1914 } 1915 if (error || len == 0) 1916 strlcpy(psinfo->pr_psargs, p->p_comm, 1917 sizeof(psinfo->pr_psargs)); 1918 else { 1919 KASSERT(len < sizeof(psinfo->pr_psargs), 1920 ("len is too long: %zu vs %zu", len, 1921 sizeof(psinfo->pr_psargs))); 1922 cp = psinfo->pr_psargs; 1923 end = cp + len - 1; 1924 for (;;) { 1925 cp = memchr(cp, '\0', end - cp); 1926 if (cp == NULL) 1927 break; 1928 *cp = ' '; 1929 } 1930 } 1931 psinfo->pr_pid = p->p_pid; 1932 sbuf_bcat(sb, psinfo, sizeof(*psinfo)); 1933 free(psinfo, M_TEMP); 1934 } 1935 *sizep = sizeof(*psinfo); 1936 } 1937 1938 static void 1939 __elfN(note_prstatus)(void *arg, struct sbuf *sb, size_t *sizep) 1940 { 1941 struct thread *td; 1942 elf_prstatus_t *status; 1943 1944 td = (struct thread *)arg; 1945 if (sb != NULL) { 1946 KASSERT(*sizep == sizeof(*status), ("invalid size")); 1947 status = malloc(sizeof(*status), M_TEMP, M_ZERO | M_WAITOK); 1948 status->pr_version = PRSTATUS_VERSION; 1949 status->pr_statussz = sizeof(elf_prstatus_t); 1950 status->pr_gregsetsz = sizeof(elf_gregset_t); 1951 status->pr_fpregsetsz = sizeof(elf_fpregset_t); 1952 status->pr_osreldate = osreldate; 1953 status->pr_cursig = td->td_proc->p_sig; 1954 status->pr_pid = td->td_tid; 1955 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 1956 fill_regs32(td, &status->pr_reg); 1957 #else 1958 fill_regs(td, &status->pr_reg); 1959 #endif 1960 sbuf_bcat(sb, status, sizeof(*status)); 1961 free(status, M_TEMP); 1962 } 1963 *sizep = sizeof(*status); 1964 } 1965 1966 static void 1967 __elfN(note_fpregset)(void *arg, struct sbuf *sb, size_t *sizep) 1968 { 1969 struct thread *td; 1970 elf_prfpregset_t *fpregset; 1971 1972 td = (struct thread *)arg; 1973 if (sb != NULL) { 1974 KASSERT(*sizep == sizeof(*fpregset), ("invalid size")); 1975 fpregset = malloc(sizeof(*fpregset), M_TEMP, M_ZERO | M_WAITOK); 1976 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 1977 fill_fpregs32(td, fpregset); 1978 #else 1979 fill_fpregs(td, fpregset); 1980 #endif 1981 sbuf_bcat(sb, fpregset, sizeof(*fpregset)); 1982 free(fpregset, M_TEMP); 1983 } 1984 *sizep = sizeof(*fpregset); 1985 } 1986 1987 static void 1988 __elfN(note_thrmisc)(void *arg, struct sbuf *sb, size_t *sizep) 1989 { 1990 struct thread *td; 1991 elf_thrmisc_t thrmisc; 1992 1993 td = (struct thread *)arg; 1994 if (sb != NULL) { 1995 KASSERT(*sizep == sizeof(thrmisc), ("invalid size")); 1996 bzero(&thrmisc._pad, sizeof(thrmisc._pad)); 1997 strcpy(thrmisc.pr_tname, td->td_name); 1998 sbuf_bcat(sb, &thrmisc, sizeof(thrmisc)); 1999 } 2000 *sizep = sizeof(thrmisc); 2001 } 2002 2003 /* 2004 * Allow for MD specific notes, as well as any MD 2005 * specific preparations for writing MI notes. 2006 */ 2007 static void 2008 __elfN(note_threadmd)(void *arg, struct sbuf *sb, size_t *sizep) 2009 { 2010 struct thread *td; 2011 void *buf; 2012 size_t size; 2013 2014 td = (struct thread *)arg; 2015 size = *sizep; 2016 if (size != 0 && sb != NULL) 2017 buf = malloc(size, M_TEMP, M_ZERO | M_WAITOK); 2018 else 2019 buf = NULL; 2020 size = 0; 2021 __elfN(dump_thread)(td, buf, &size); 2022 KASSERT(sb == NULL || *sizep == size, ("invalid size")); 2023 if (size != 0 && sb != NULL) 2024 sbuf_bcat(sb, buf, size); 2025 free(buf, M_TEMP); 2026 *sizep = size; 2027 } 2028 2029 #ifdef KINFO_PROC_SIZE 2030 CTASSERT(sizeof(struct kinfo_proc) == KINFO_PROC_SIZE); 2031 #endif 2032 2033 static void 2034 __elfN(note_procstat_proc)(void *arg, struct sbuf *sb, size_t *sizep) 2035 { 2036 struct proc *p; 2037 size_t size; 2038 int structsize; 2039 2040 p = (struct proc *)arg; 2041 size = sizeof(structsize) + p->p_numthreads * 2042 sizeof(elf_kinfo_proc_t); 2043 2044 if (sb != NULL) { 2045 KASSERT(*sizep == size, ("invalid size")); 2046 structsize = sizeof(elf_kinfo_proc_t); 2047 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2048 sx_slock(&proctree_lock); 2049 PROC_LOCK(p); 2050 kern_proc_out(p, sb, ELF_KERN_PROC_MASK); 2051 sx_sunlock(&proctree_lock); 2052 } 2053 *sizep = size; 2054 } 2055 2056 #ifdef KINFO_FILE_SIZE 2057 CTASSERT(sizeof(struct kinfo_file) == KINFO_FILE_SIZE); 2058 #endif 2059 2060 static void 2061 note_procstat_files(void *arg, struct sbuf *sb, size_t *sizep) 2062 { 2063 struct proc *p; 2064 size_t size, sect_sz, i; 2065 ssize_t start_len, sect_len; 2066 int structsize, filedesc_flags; 2067 2068 if (coredump_pack_fileinfo) 2069 filedesc_flags = KERN_FILEDESC_PACK_KINFO; 2070 else 2071 filedesc_flags = 0; 2072 2073 p = (struct proc *)arg; 2074 structsize = sizeof(struct kinfo_file); 2075 if (sb == NULL) { 2076 size = 0; 2077 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN); 2078 sbuf_set_drain(sb, sbuf_drain_count, &size); 2079 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2080 PROC_LOCK(p); 2081 kern_proc_filedesc_out(p, sb, -1, filedesc_flags); 2082 sbuf_finish(sb); 2083 sbuf_delete(sb); 2084 *sizep = size; 2085 } else { 2086 sbuf_start_section(sb, &start_len); 2087 2088 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2089 PROC_LOCK(p); 2090 kern_proc_filedesc_out(p, sb, *sizep - sizeof(structsize), 2091 filedesc_flags); 2092 2093 sect_len = sbuf_end_section(sb, start_len, 0, 0); 2094 if (sect_len < 0) 2095 return; 2096 sect_sz = sect_len; 2097 2098 KASSERT(sect_sz <= *sizep, 2099 ("kern_proc_filedesc_out did not respect maxlen; " 2100 "requested %zu, got %zu", *sizep - sizeof(structsize), 2101 sect_sz - sizeof(structsize))); 2102 2103 for (i = 0; i < *sizep - sect_sz && sb->s_error == 0; i++) 2104 sbuf_putc(sb, 0); 2105 } 2106 } 2107 2108 #ifdef KINFO_VMENTRY_SIZE 2109 CTASSERT(sizeof(struct kinfo_vmentry) == KINFO_VMENTRY_SIZE); 2110 #endif 2111 2112 static void 2113 note_procstat_vmmap(void *arg, struct sbuf *sb, size_t *sizep) 2114 { 2115 struct proc *p; 2116 size_t size; 2117 int structsize, vmmap_flags; 2118 2119 if (coredump_pack_vmmapinfo) 2120 vmmap_flags = KERN_VMMAP_PACK_KINFO; 2121 else 2122 vmmap_flags = 0; 2123 2124 p = (struct proc *)arg; 2125 structsize = sizeof(struct kinfo_vmentry); 2126 if (sb == NULL) { 2127 size = 0; 2128 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN); 2129 sbuf_set_drain(sb, sbuf_drain_count, &size); 2130 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2131 PROC_LOCK(p); 2132 kern_proc_vmmap_out(p, sb, -1, vmmap_flags); 2133 sbuf_finish(sb); 2134 sbuf_delete(sb); 2135 *sizep = size; 2136 } else { 2137 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2138 PROC_LOCK(p); 2139 kern_proc_vmmap_out(p, sb, *sizep - sizeof(structsize), 2140 vmmap_flags); 2141 } 2142 } 2143 2144 static void 2145 note_procstat_groups(void *arg, struct sbuf *sb, size_t *sizep) 2146 { 2147 struct proc *p; 2148 size_t size; 2149 int structsize; 2150 2151 p = (struct proc *)arg; 2152 size = sizeof(structsize) + p->p_ucred->cr_ngroups * sizeof(gid_t); 2153 if (sb != NULL) { 2154 KASSERT(*sizep == size, ("invalid size")); 2155 structsize = sizeof(gid_t); 2156 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2157 sbuf_bcat(sb, p->p_ucred->cr_groups, p->p_ucred->cr_ngroups * 2158 sizeof(gid_t)); 2159 } 2160 *sizep = size; 2161 } 2162 2163 static void 2164 note_procstat_umask(void *arg, struct sbuf *sb, size_t *sizep) 2165 { 2166 struct proc *p; 2167 size_t size; 2168 int structsize; 2169 2170 p = (struct proc *)arg; 2171 size = sizeof(structsize) + sizeof(p->p_fd->fd_cmask); 2172 if (sb != NULL) { 2173 KASSERT(*sizep == size, ("invalid size")); 2174 structsize = sizeof(p->p_fd->fd_cmask); 2175 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2176 sbuf_bcat(sb, &p->p_fd->fd_cmask, sizeof(p->p_fd->fd_cmask)); 2177 } 2178 *sizep = size; 2179 } 2180 2181 static void 2182 note_procstat_rlimit(void *arg, struct sbuf *sb, size_t *sizep) 2183 { 2184 struct proc *p; 2185 struct rlimit rlim[RLIM_NLIMITS]; 2186 size_t size; 2187 int structsize, i; 2188 2189 p = (struct proc *)arg; 2190 size = sizeof(structsize) + sizeof(rlim); 2191 if (sb != NULL) { 2192 KASSERT(*sizep == size, ("invalid size")); 2193 structsize = sizeof(rlim); 2194 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2195 PROC_LOCK(p); 2196 for (i = 0; i < RLIM_NLIMITS; i++) 2197 lim_rlimit_proc(p, i, &rlim[i]); 2198 PROC_UNLOCK(p); 2199 sbuf_bcat(sb, rlim, sizeof(rlim)); 2200 } 2201 *sizep = size; 2202 } 2203 2204 static void 2205 note_procstat_osrel(void *arg, struct sbuf *sb, size_t *sizep) 2206 { 2207 struct proc *p; 2208 size_t size; 2209 int structsize; 2210 2211 p = (struct proc *)arg; 2212 size = sizeof(structsize) + sizeof(p->p_osrel); 2213 if (sb != NULL) { 2214 KASSERT(*sizep == size, ("invalid size")); 2215 structsize = sizeof(p->p_osrel); 2216 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2217 sbuf_bcat(sb, &p->p_osrel, sizeof(p->p_osrel)); 2218 } 2219 *sizep = size; 2220 } 2221 2222 static void 2223 __elfN(note_procstat_psstrings)(void *arg, struct sbuf *sb, size_t *sizep) 2224 { 2225 struct proc *p; 2226 elf_ps_strings_t ps_strings; 2227 size_t size; 2228 int structsize; 2229 2230 p = (struct proc *)arg; 2231 size = sizeof(structsize) + sizeof(ps_strings); 2232 if (sb != NULL) { 2233 KASSERT(*sizep == size, ("invalid size")); 2234 structsize = sizeof(ps_strings); 2235 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 2236 ps_strings = PTROUT(p->p_sysent->sv_psstrings); 2237 #else 2238 ps_strings = p->p_sysent->sv_psstrings; 2239 #endif 2240 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2241 sbuf_bcat(sb, &ps_strings, sizeof(ps_strings)); 2242 } 2243 *sizep = size; 2244 } 2245 2246 static void 2247 __elfN(note_procstat_auxv)(void *arg, struct sbuf *sb, size_t *sizep) 2248 { 2249 struct proc *p; 2250 size_t size; 2251 int structsize; 2252 2253 p = (struct proc *)arg; 2254 if (sb == NULL) { 2255 size = 0; 2256 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN); 2257 sbuf_set_drain(sb, sbuf_drain_count, &size); 2258 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2259 PHOLD(p); 2260 proc_getauxv(curthread, p, sb); 2261 PRELE(p); 2262 sbuf_finish(sb); 2263 sbuf_delete(sb); 2264 *sizep = size; 2265 } else { 2266 structsize = sizeof(Elf_Auxinfo); 2267 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2268 PHOLD(p); 2269 proc_getauxv(curthread, p, sb); 2270 PRELE(p); 2271 } 2272 } 2273 2274 static boolean_t 2275 __elfN(parse_notes)(struct image_params *imgp, Elf_Brandnote *checknote, 2276 int32_t *osrel, const Elf_Phdr *pnote) 2277 { 2278 const Elf_Note *note, *note0, *note_end; 2279 const char *note_name; 2280 char *buf; 2281 int i, error; 2282 boolean_t res; 2283 2284 /* We need some limit, might as well use PAGE_SIZE. */ 2285 if (pnote == NULL || pnote->p_filesz > PAGE_SIZE) 2286 return (FALSE); 2287 ASSERT_VOP_LOCKED(imgp->vp, "parse_notes"); 2288 if (pnote->p_offset > PAGE_SIZE || 2289 pnote->p_filesz > PAGE_SIZE - pnote->p_offset) { 2290 VOP_UNLOCK(imgp->vp, 0); 2291 buf = malloc(pnote->p_filesz, M_TEMP, M_WAITOK); 2292 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY); 2293 error = vn_rdwr(UIO_READ, imgp->vp, buf, pnote->p_filesz, 2294 pnote->p_offset, UIO_SYSSPACE, IO_NODELOCKED, 2295 curthread->td_ucred, NOCRED, NULL, curthread); 2296 if (error != 0) { 2297 uprintf("i/o error PT_NOTE\n"); 2298 res = FALSE; 2299 goto ret; 2300 } 2301 note = note0 = (const Elf_Note *)buf; 2302 note_end = (const Elf_Note *)(buf + pnote->p_filesz); 2303 } else { 2304 note = note0 = (const Elf_Note *)(imgp->image_header + 2305 pnote->p_offset); 2306 note_end = (const Elf_Note *)(imgp->image_header + 2307 pnote->p_offset + pnote->p_filesz); 2308 buf = NULL; 2309 } 2310 for (i = 0; i < 100 && note >= note0 && note < note_end; i++) { 2311 if (!aligned(note, Elf32_Addr) || (const char *)note_end - 2312 (const char *)note < sizeof(Elf_Note)) { 2313 res = FALSE; 2314 goto ret; 2315 } 2316 if (note->n_namesz != checknote->hdr.n_namesz || 2317 note->n_descsz != checknote->hdr.n_descsz || 2318 note->n_type != checknote->hdr.n_type) 2319 goto nextnote; 2320 note_name = (const char *)(note + 1); 2321 if (note_name + checknote->hdr.n_namesz >= 2322 (const char *)note_end || strncmp(checknote->vendor, 2323 note_name, checknote->hdr.n_namesz) != 0) 2324 goto nextnote; 2325 2326 /* 2327 * Fetch the osreldate for binary 2328 * from the ELF OSABI-note if necessary. 2329 */ 2330 if ((checknote->flags & BN_TRANSLATE_OSREL) != 0 && 2331 checknote->trans_osrel != NULL) { 2332 res = checknote->trans_osrel(note, osrel); 2333 goto ret; 2334 } 2335 res = TRUE; 2336 goto ret; 2337 nextnote: 2338 note = (const Elf_Note *)((const char *)(note + 1) + 2339 roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE) + 2340 roundup2(note->n_descsz, ELF_NOTE_ROUNDSIZE)); 2341 } 2342 res = FALSE; 2343 ret: 2344 free(buf, M_TEMP); 2345 return (res); 2346 } 2347 2348 /* 2349 * Try to find the appropriate ABI-note section for checknote, 2350 * fetch the osreldate for binary from the ELF OSABI-note. Only the 2351 * first page of the image is searched, the same as for headers. 2352 */ 2353 static boolean_t 2354 __elfN(check_note)(struct image_params *imgp, Elf_Brandnote *checknote, 2355 int32_t *osrel) 2356 { 2357 const Elf_Phdr *phdr; 2358 const Elf_Ehdr *hdr; 2359 int i; 2360 2361 hdr = (const Elf_Ehdr *)imgp->image_header; 2362 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 2363 2364 for (i = 0; i < hdr->e_phnum; i++) { 2365 if (phdr[i].p_type == PT_NOTE && 2366 __elfN(parse_notes)(imgp, checknote, osrel, &phdr[i])) 2367 return (TRUE); 2368 } 2369 return (FALSE); 2370 2371 } 2372 2373 /* 2374 * Tell kern_execve.c about it, with a little help from the linker. 2375 */ 2376 static struct execsw __elfN(execsw) = { 2377 __CONCAT(exec_, __elfN(imgact)), 2378 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) 2379 }; 2380 EXEC_SET(__CONCAT(elf, __ELF_WORD_SIZE), __elfN(execsw)); 2381 2382 static vm_prot_t 2383 __elfN(trans_prot)(Elf_Word flags) 2384 { 2385 vm_prot_t prot; 2386 2387 prot = 0; 2388 if (flags & PF_X) 2389 prot |= VM_PROT_EXECUTE; 2390 if (flags & PF_W) 2391 prot |= VM_PROT_WRITE; 2392 if (flags & PF_R) 2393 prot |= VM_PROT_READ; 2394 #if __ELF_WORD_SIZE == 32 2395 #if defined(__amd64__) 2396 if (i386_read_exec && (flags & PF_R)) 2397 prot |= VM_PROT_EXECUTE; 2398 #endif 2399 #endif 2400 return (prot); 2401 } 2402 2403 static Elf_Word 2404 __elfN(untrans_prot)(vm_prot_t prot) 2405 { 2406 Elf_Word flags; 2407 2408 flags = 0; 2409 if (prot & VM_PROT_EXECUTE) 2410 flags |= PF_X; 2411 if (prot & VM_PROT_READ) 2412 flags |= PF_R; 2413 if (prot & VM_PROT_WRITE) 2414 flags |= PF_W; 2415 return (flags); 2416 }
Cache object: 231b8ed29e0a28cdd1e27d71259a50ea
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