imgact_elf.c revision 318192
1/*- 2 * Copyright (c) 2000 David O'Brien 3 * Copyright (c) 1995-1996 S��ren 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: stable/10/sys/kern/imgact_elf.c 318192 2017-05-11 17:26:34Z jhb $"); 33 34#include "opt_capsicum.h" 35#include "opt_compat.h" 36#include "opt_core.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/imgact.h> 43#include <sys/imgact_elf.h> 44#include <sys/jail.h> 45#include <sys/kernel.h> 46#include <sys/lock.h> 47#include <sys/malloc.h> 48#include <sys/mount.h> 49#include <sys/mman.h> 50#include <sys/namei.h> 51#include <sys/pioctl.h> 52#include <sys/proc.h> 53#include <sys/procfs.h> 54#include <sys/racct.h> 55#include <sys/resourcevar.h> 56#include <sys/rwlock.h> 57#include <sys/sbuf.h> 58#include <sys/sf_buf.h> 59#include <sys/smp.h> 60#include <sys/systm.h> 61#include <sys/signalvar.h> 62#include <sys/stat.h> 63#include <sys/sx.h> 64#include <sys/syscall.h> 65#include <sys/sysctl.h> 66#include <sys/sysent.h> 67#include <sys/vnode.h> 68#include <sys/syslog.h> 69#include <sys/eventhandler.h> 70#include <sys/user.h> 71 72#include <net/zlib.h> 73 74#include <vm/vm.h> 75#include <vm/vm_kern.h> 76#include <vm/vm_param.h> 77#include <vm/pmap.h> 78#include <vm/vm_map.h> 79#include <vm/vm_object.h> 80#include <vm/vm_extern.h> 81 82#include <machine/elf.h> 83#include <machine/md_var.h> 84 85#define ELF_NOTE_ROUNDSIZE 4 86#define OLD_EI_BRAND 8 87 88static int __elfN(check_header)(const Elf_Ehdr *hdr); 89static Elf_Brandinfo *__elfN(get_brandinfo)(struct image_params *imgp, 90 const char *interp, int interp_name_len, int32_t *osrel); 91static int __elfN(load_file)(struct proc *p, const char *file, u_long *addr, 92 u_long *entry, size_t pagesize); 93static int __elfN(load_section)(struct image_params *imgp, vm_offset_t offset, 94 caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot, 95 size_t pagesize); 96static int __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp); 97static boolean_t __elfN(freebsd_trans_osrel)(const Elf_Note *note, 98 int32_t *osrel); 99static boolean_t kfreebsd_trans_osrel(const Elf_Note *note, int32_t *osrel); 100static boolean_t __elfN(check_note)(struct image_params *imgp, 101 Elf_Brandnote *checknote, int32_t *osrel); 102static vm_prot_t __elfN(trans_prot)(Elf_Word); 103static Elf_Word __elfN(untrans_prot)(vm_prot_t); 104 105SYSCTL_NODE(_kern, OID_AUTO, __CONCAT(elf, __ELF_WORD_SIZE), CTLFLAG_RW, 0, 106 ""); 107 108#ifdef COMPRESS_USER_CORES 109static int compress_core(gzFile, char *, char *, unsigned int, 110 struct thread * td); 111#endif 112#define CORE_BUF_SIZE (16 * 1024) 113 114int __elfN(fallback_brand) = -1; 115SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO, 116 fallback_brand, CTLFLAG_RW, &__elfN(fallback_brand), 0, 117 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) " brand of last resort"); 118TUNABLE_INT("kern.elf" __XSTRING(__ELF_WORD_SIZE) ".fallback_brand", 119 &__elfN(fallback_brand)); 120 121static int elf_legacy_coredump = 0; 122SYSCTL_INT(_debug, OID_AUTO, __elfN(legacy_coredump), CTLFLAG_RW, 123 &elf_legacy_coredump, 0, ""); 124 125int __elfN(nxstack) = 126#if defined(__amd64__) || defined(__powerpc64__) /* both 64 and 32 bit */ 127 1; 128#else 129 0; 130#endif 131SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO, 132 nxstack, CTLFLAG_RW, &__elfN(nxstack), 0, 133 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) ": enable non-executable stack"); 134 135#if __ELF_WORD_SIZE == 32 136#if defined(__amd64__) || defined(__ia64__) 137int i386_read_exec = 0; 138SYSCTL_INT(_kern_elf32, OID_AUTO, read_exec, CTLFLAG_RW, &i386_read_exec, 0, 139 "enable execution from readable segments"); 140#endif 141#endif 142 143static Elf_Brandinfo *elf_brand_list[MAX_BRANDS]; 144 145#define trunc_page_ps(va, ps) ((va) & ~(ps - 1)) 146#define round_page_ps(va, ps) (((va) + (ps - 1)) & ~(ps - 1)) 147#define aligned(a, t) (trunc_page_ps((u_long)(a), sizeof(t)) == (u_long)(a)) 148 149static const char FREEBSD_ABI_VENDOR[] = "FreeBSD"; 150 151Elf_Brandnote __elfN(freebsd_brandnote) = { 152 .hdr.n_namesz = sizeof(FREEBSD_ABI_VENDOR), 153 .hdr.n_descsz = sizeof(int32_t), 154 .hdr.n_type = 1, 155 .vendor = FREEBSD_ABI_VENDOR, 156 .flags = BN_TRANSLATE_OSREL, 157 .trans_osrel = __elfN(freebsd_trans_osrel) 158}; 159 160static boolean_t 161__elfN(freebsd_trans_osrel)(const Elf_Note *note, int32_t *osrel) 162{ 163 uintptr_t p; 164 165 p = (uintptr_t)(note + 1); 166 p += roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE); 167 *osrel = *(const int32_t *)(p); 168 169 return (TRUE); 170} 171 172static const char GNU_ABI_VENDOR[] = "GNU"; 173static int GNU_KFREEBSD_ABI_DESC = 3; 174 175Elf_Brandnote __elfN(kfreebsd_brandnote) = { 176 .hdr.n_namesz = sizeof(GNU_ABI_VENDOR), 177 .hdr.n_descsz = 16, /* XXX at least 16 */ 178 .hdr.n_type = 1, 179 .vendor = GNU_ABI_VENDOR, 180 .flags = BN_TRANSLATE_OSREL, 181 .trans_osrel = kfreebsd_trans_osrel 182}; 183 184static boolean_t 185kfreebsd_trans_osrel(const Elf_Note *note, int32_t *osrel) 186{ 187 const Elf32_Word *desc; 188 uintptr_t p; 189 190 p = (uintptr_t)(note + 1); 191 p += roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE); 192 193 desc = (const Elf32_Word *)p; 194 if (desc[0] != GNU_KFREEBSD_ABI_DESC) 195 return (FALSE); 196 197 /* 198 * Debian GNU/kFreeBSD embed the earliest compatible kernel version 199 * (__FreeBSD_version: <major><two digit minor>Rxx) in the LSB way. 200 */ 201 *osrel = desc[1] * 100000 + desc[2] * 1000 + desc[3]; 202 203 return (TRUE); 204} 205 206int 207__elfN(insert_brand_entry)(Elf_Brandinfo *entry) 208{ 209 int i; 210 211 for (i = 0; i < MAX_BRANDS; i++) { 212 if (elf_brand_list[i] == NULL) { 213 elf_brand_list[i] = entry; 214 break; 215 } 216 } 217 if (i == MAX_BRANDS) { 218 printf("WARNING: %s: could not insert brandinfo entry: %p\n", 219 __func__, entry); 220 return (-1); 221 } 222 return (0); 223} 224 225int 226__elfN(remove_brand_entry)(Elf_Brandinfo *entry) 227{ 228 int i; 229 230 for (i = 0; i < MAX_BRANDS; i++) { 231 if (elf_brand_list[i] == entry) { 232 elf_brand_list[i] = NULL; 233 break; 234 } 235 } 236 if (i == MAX_BRANDS) 237 return (-1); 238 return (0); 239} 240 241int 242__elfN(brand_inuse)(Elf_Brandinfo *entry) 243{ 244 struct proc *p; 245 int rval = FALSE; 246 247 sx_slock(&allproc_lock); 248 FOREACH_PROC_IN_SYSTEM(p) { 249 if (p->p_sysent == entry->sysvec) { 250 rval = TRUE; 251 break; 252 } 253 } 254 sx_sunlock(&allproc_lock); 255 256 return (rval); 257} 258 259static Elf_Brandinfo * 260__elfN(get_brandinfo)(struct image_params *imgp, const char *interp, 261 int interp_name_len, int32_t *osrel) 262{ 263 const Elf_Ehdr *hdr = (const Elf_Ehdr *)imgp->image_header; 264 Elf_Brandinfo *bi, *bi_m; 265 boolean_t ret; 266 int i; 267 268 /* 269 * We support four types of branding -- (1) the ELF EI_OSABI field 270 * that SCO added to the ELF spec, (2) FreeBSD 3.x's traditional string 271 * branding w/in the ELF header, (3) path of the `interp_path' 272 * field, and (4) the ".note.ABI-tag" ELF section. 273 */ 274 275 /* Look for an ".note.ABI-tag" ELF section */ 276 bi_m = NULL; 277 for (i = 0; i < MAX_BRANDS; i++) { 278 bi = elf_brand_list[i]; 279 if (bi == NULL) 280 continue; 281 if (hdr->e_machine == bi->machine && (bi->flags & 282 (BI_BRAND_NOTE|BI_BRAND_NOTE_MANDATORY)) != 0) { 283 ret = __elfN(check_note)(imgp, bi->brand_note, osrel); 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 && (strlen(bi->interp_path) + 295 1 != interp_name_len || strncmp(interp, 296 bi->interp_path, interp_name_len) != 0)) { 297 bi_m = bi; 298 ret = 0; 299 } 300 if (ret) 301 return (bi); 302 } 303 } 304 if (bi_m != NULL) 305 return (bi_m); 306 307 /* If the executable has a brand, search for it in the brand list. */ 308 for (i = 0; i < MAX_BRANDS; i++) { 309 bi = elf_brand_list[i]; 310 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY) 311 continue; 312 if (hdr->e_machine == bi->machine && 313 (hdr->e_ident[EI_OSABI] == bi->brand || 314 strncmp((const char *)&hdr->e_ident[OLD_EI_BRAND], 315 bi->compat_3_brand, strlen(bi->compat_3_brand)) == 0)) 316 return (bi); 317 } 318 319 /* Lacking a known brand, search for a recognized interpreter. */ 320 if (interp != NULL) { 321 for (i = 0; i < MAX_BRANDS; i++) { 322 bi = elf_brand_list[i]; 323 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY) 324 continue; 325 if (hdr->e_machine == bi->machine && 326 /* ELF image p_filesz includes terminating zero */ 327 strlen(bi->interp_path) + 1 == interp_name_len && 328 strncmp(interp, bi->interp_path, interp_name_len) 329 == 0) 330 return (bi); 331 } 332 } 333 334 /* Lacking a recognized interpreter, try the default brand */ 335 for (i = 0; i < MAX_BRANDS; i++) { 336 bi = elf_brand_list[i]; 337 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY) 338 continue; 339 if (hdr->e_machine == bi->machine && 340 __elfN(fallback_brand) == bi->brand) 341 return (bi); 342 } 343 return (NULL); 344} 345 346static int 347__elfN(check_header)(const Elf_Ehdr *hdr) 348{ 349 Elf_Brandinfo *bi; 350 int i; 351 352 if (!IS_ELF(*hdr) || 353 hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS || 354 hdr->e_ident[EI_DATA] != ELF_TARG_DATA || 355 hdr->e_ident[EI_VERSION] != EV_CURRENT || 356 hdr->e_phentsize != sizeof(Elf_Phdr) || 357 hdr->e_version != ELF_TARG_VER) 358 return (ENOEXEC); 359 360 /* 361 * Make sure we have at least one brand for this machine. 362 */ 363 364 for (i = 0; i < MAX_BRANDS; i++) { 365 bi = elf_brand_list[i]; 366 if (bi != NULL && bi->machine == hdr->e_machine) 367 break; 368 } 369 if (i == MAX_BRANDS) 370 return (ENOEXEC); 371 372 return (0); 373} 374 375static int 376__elfN(map_partial)(vm_map_t map, vm_object_t object, vm_ooffset_t offset, 377 vm_offset_t start, vm_offset_t end, vm_prot_t prot) 378{ 379 struct sf_buf *sf; 380 int error; 381 vm_offset_t off; 382 383 /* 384 * Create the page if it doesn't exist yet. Ignore errors. 385 */ 386 vm_map_lock(map); 387 vm_map_insert(map, NULL, 0, trunc_page(start), round_page(end), 388 VM_PROT_ALL, VM_PROT_ALL, 0); 389 vm_map_unlock(map); 390 391 /* 392 * Find the page from the underlying object. 393 */ 394 if (object) { 395 sf = vm_imgact_map_page(object, offset); 396 if (sf == NULL) 397 return (KERN_FAILURE); 398 off = offset - trunc_page(offset); 399 error = copyout((caddr_t)sf_buf_kva(sf) + off, (caddr_t)start, 400 end - start); 401 vm_imgact_unmap_page(sf); 402 if (error != 0) 403 return (KERN_FAILURE); 404 } 405 406 return (KERN_SUCCESS); 407} 408 409static int 410__elfN(map_insert)(vm_map_t map, vm_object_t object, vm_ooffset_t offset, 411 vm_offset_t start, vm_offset_t end, vm_prot_t prot, int cow) 412{ 413 struct sf_buf *sf; 414 vm_offset_t off; 415 vm_size_t sz; 416 int error, rv; 417 418 if (start != trunc_page(start)) { 419 rv = __elfN(map_partial)(map, object, offset, start, 420 round_page(start), prot); 421 if (rv) 422 return (rv); 423 offset += round_page(start) - start; 424 start = round_page(start); 425 } 426 if (end != round_page(end)) { 427 rv = __elfN(map_partial)(map, object, offset + 428 trunc_page(end) - start, trunc_page(end), end, prot); 429 if (rv) 430 return (rv); 431 end = trunc_page(end); 432 } 433 if (end > start) { 434 if (offset & PAGE_MASK) { 435 /* 436 * The mapping is not page aligned. This means we have 437 * to copy the data. Sigh. 438 */ 439 rv = vm_map_find(map, NULL, 0, &start, end - start, 0, 440 VMFS_NO_SPACE, prot | VM_PROT_WRITE, VM_PROT_ALL, 441 0); 442 if (rv != KERN_SUCCESS) 443 return (rv); 444 if (object == NULL) 445 return (KERN_SUCCESS); 446 for (; start < end; start += sz) { 447 sf = vm_imgact_map_page(object, offset); 448 if (sf == NULL) 449 return (KERN_FAILURE); 450 off = offset - trunc_page(offset); 451 sz = end - start; 452 if (sz > PAGE_SIZE - off) 453 sz = PAGE_SIZE - off; 454 error = copyout((caddr_t)sf_buf_kva(sf) + off, 455 (caddr_t)start, sz); 456 vm_imgact_unmap_page(sf); 457 if (error != 0) 458 return (KERN_FAILURE); 459 offset += sz; 460 } 461 rv = KERN_SUCCESS; 462 } else { 463 vm_object_reference(object); 464 vm_map_lock(map); 465 rv = vm_map_insert(map, object, offset, start, end, 466 prot, VM_PROT_ALL, cow); 467 vm_map_unlock(map); 468 if (rv != KERN_SUCCESS) 469 vm_object_deallocate(object); 470 } 471 return (rv); 472 } else { 473 return (KERN_SUCCESS); 474 } 475} 476 477static int 478__elfN(load_section)(struct image_params *imgp, vm_offset_t offset, 479 caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot, 480 size_t pagesize) 481{ 482 struct sf_buf *sf; 483 size_t map_len; 484 vm_map_t map; 485 vm_object_t object; 486 vm_offset_t map_addr; 487 int error, rv, cow; 488 size_t copy_len; 489 vm_offset_t file_addr; 490 491 /* 492 * It's necessary to fail if the filsz + offset taken from the 493 * header is greater than the actual file pager object's size. 494 * If we were to allow this, then the vm_map_find() below would 495 * walk right off the end of the file object and into the ether. 496 * 497 * While I'm here, might as well check for something else that 498 * is invalid: filsz cannot be greater than memsz. 499 */ 500 if ((off_t)filsz + offset > imgp->attr->va_size || filsz > memsz) { 501 uprintf("elf_load_section: truncated ELF file\n"); 502 return (ENOEXEC); 503 } 504 505 object = imgp->object; 506 map = &imgp->proc->p_vmspace->vm_map; 507 map_addr = trunc_page_ps((vm_offset_t)vmaddr, pagesize); 508 file_addr = trunc_page_ps(offset, pagesize); 509 510 /* 511 * We have two choices. We can either clear the data in the last page 512 * of an oversized mapping, or we can start the anon mapping a page 513 * early and copy the initialized data into that first page. We 514 * choose the second.. 515 */ 516 if (memsz > filsz) 517 map_len = trunc_page_ps(offset + filsz, pagesize) - file_addr; 518 else 519 map_len = round_page_ps(offset + filsz, pagesize) - file_addr; 520 521 if (map_len != 0) { 522 /* cow flags: don't dump readonly sections in core */ 523 cow = MAP_COPY_ON_WRITE | MAP_PREFAULT | 524 (prot & VM_PROT_WRITE ? 0 : MAP_DISABLE_COREDUMP); 525 526 rv = __elfN(map_insert)(map, 527 object, 528 file_addr, /* file offset */ 529 map_addr, /* virtual start */ 530 map_addr + map_len,/* virtual end */ 531 prot, 532 cow); 533 if (rv != KERN_SUCCESS) 534 return (EINVAL); 535 536 /* we can stop now if we've covered it all */ 537 if (memsz == filsz) { 538 return (0); 539 } 540 } 541 542 543 /* 544 * We have to get the remaining bit of the file into the first part 545 * of the oversized map segment. This is normally because the .data 546 * segment in the file is extended to provide bss. It's a neat idea 547 * to try and save a page, but it's a pain in the behind to implement. 548 */ 549 copy_len = (offset + filsz) - trunc_page_ps(offset + filsz, pagesize); 550 map_addr = trunc_page_ps((vm_offset_t)vmaddr + filsz, pagesize); 551 map_len = round_page_ps((vm_offset_t)vmaddr + memsz, pagesize) - 552 map_addr; 553 554 /* This had damn well better be true! */ 555 if (map_len != 0) { 556 rv = __elfN(map_insert)(map, NULL, 0, map_addr, map_addr + 557 map_len, VM_PROT_ALL, 0); 558 if (rv != KERN_SUCCESS) { 559 return (EINVAL); 560 } 561 } 562 563 if (copy_len != 0) { 564 vm_offset_t off; 565 566 sf = vm_imgact_map_page(object, offset + filsz); 567 if (sf == NULL) 568 return (EIO); 569 570 /* send the page fragment to user space */ 571 off = trunc_page_ps(offset + filsz, pagesize) - 572 trunc_page(offset + filsz); 573 error = copyout((caddr_t)sf_buf_kva(sf) + off, 574 (caddr_t)map_addr, copy_len); 575 vm_imgact_unmap_page(sf); 576 if (error) { 577 return (error); 578 } 579 } 580 581 /* 582 * set it to the specified protection. 583 * XXX had better undo the damage from pasting over the cracks here! 584 */ 585 vm_map_protect(map, trunc_page(map_addr), round_page(map_addr + 586 map_len), prot, FALSE); 587 588 return (0); 589} 590 591/* 592 * Load the file "file" into memory. It may be either a shared object 593 * or an executable. 594 * 595 * The "addr" reference parameter is in/out. On entry, it specifies 596 * the address where a shared object should be loaded. If the file is 597 * an executable, this value is ignored. On exit, "addr" specifies 598 * where the file was actually loaded. 599 * 600 * The "entry" reference parameter is out only. On exit, it specifies 601 * the entry point for the loaded file. 602 */ 603static int 604__elfN(load_file)(struct proc *p, const char *file, u_long *addr, 605 u_long *entry, size_t pagesize) 606{ 607 struct { 608 struct nameidata nd; 609 struct vattr attr; 610 struct image_params image_params; 611 } *tempdata; 612 const Elf_Ehdr *hdr = NULL; 613 const Elf_Phdr *phdr = NULL; 614 struct nameidata *nd; 615 struct vattr *attr; 616 struct image_params *imgp; 617 vm_prot_t prot; 618 u_long rbase; 619 u_long base_addr = 0; 620 int error, i, numsegs; 621 622#ifdef CAPABILITY_MODE 623 /* 624 * XXXJA: This check can go away once we are sufficiently confident 625 * that the checks in namei() are correct. 626 */ 627 if (IN_CAPABILITY_MODE(curthread)) 628 return (ECAPMODE); 629#endif 630 631 tempdata = malloc(sizeof(*tempdata), M_TEMP, M_WAITOK); 632 nd = &tempdata->nd; 633 attr = &tempdata->attr; 634 imgp = &tempdata->image_params; 635 636 /* 637 * Initialize part of the common data 638 */ 639 imgp->proc = p; 640 imgp->attr = attr; 641 imgp->firstpage = NULL; 642 imgp->image_header = NULL; 643 imgp->object = NULL; 644 imgp->execlabel = NULL; 645 646 NDINIT(nd, LOOKUP, LOCKLEAF | FOLLOW, UIO_SYSSPACE, file, curthread); 647 if ((error = namei(nd)) != 0) { 648 nd->ni_vp = NULL; 649 goto fail; 650 } 651 NDFREE(nd, NDF_ONLY_PNBUF); 652 imgp->vp = nd->ni_vp; 653 654 /* 655 * Check permissions, modes, uid, etc on the file, and "open" it. 656 */ 657 error = exec_check_permissions(imgp); 658 if (error) 659 goto fail; 660 661 error = exec_map_first_page(imgp); 662 if (error) 663 goto fail; 664 665 /* 666 * Also make certain that the interpreter stays the same, so set 667 * its VV_TEXT flag, too. 668 */ 669 VOP_SET_TEXT(nd->ni_vp); 670 671 imgp->object = nd->ni_vp->v_object; 672 673 hdr = (const Elf_Ehdr *)imgp->image_header; 674 if ((error = __elfN(check_header)(hdr)) != 0) 675 goto fail; 676 if (hdr->e_type == ET_DYN) 677 rbase = *addr; 678 else if (hdr->e_type == ET_EXEC) 679 rbase = 0; 680 else { 681 error = ENOEXEC; 682 goto fail; 683 } 684 685 /* Only support headers that fit within first page for now */ 686 if ((hdr->e_phoff > PAGE_SIZE) || 687 (u_int)hdr->e_phentsize * hdr->e_phnum > PAGE_SIZE - hdr->e_phoff) { 688 error = ENOEXEC; 689 goto fail; 690 } 691 692 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 693 if (!aligned(phdr, Elf_Addr)) { 694 error = ENOEXEC; 695 goto fail; 696 } 697 698 for (i = 0, numsegs = 0; i < hdr->e_phnum; i++) { 699 if (phdr[i].p_type == PT_LOAD && phdr[i].p_memsz != 0) { 700 /* Loadable segment */ 701 prot = __elfN(trans_prot)(phdr[i].p_flags); 702 error = __elfN(load_section)(imgp, phdr[i].p_offset, 703 (caddr_t)(uintptr_t)phdr[i].p_vaddr + rbase, 704 phdr[i].p_memsz, phdr[i].p_filesz, prot, pagesize); 705 if (error != 0) 706 goto fail; 707 /* 708 * Establish the base address if this is the 709 * first segment. 710 */ 711 if (numsegs == 0) 712 base_addr = trunc_page(phdr[i].p_vaddr + 713 rbase); 714 numsegs++; 715 } 716 } 717 *addr = base_addr; 718 *entry = (unsigned long)hdr->e_entry + rbase; 719 720fail: 721 if (imgp->firstpage) 722 exec_unmap_first_page(imgp); 723 724 if (nd->ni_vp) 725 vput(nd->ni_vp); 726 727 free(tempdata, M_TEMP); 728 729 return (error); 730} 731 732static int 733__CONCAT(exec_, __elfN(imgact))(struct image_params *imgp) 734{ 735 struct thread *td; 736 const Elf_Ehdr *hdr; 737 const Elf_Phdr *phdr; 738 Elf_Auxargs *elf_auxargs; 739 struct vmspace *vmspace; 740 const char *err_str, *newinterp; 741 char *interp, *interp_buf, *path; 742 Elf_Brandinfo *brand_info; 743 struct sysentvec *sv; 744 vm_prot_t prot; 745 u_long text_size, data_size, total_size, text_addr, data_addr; 746 u_long seg_size, seg_addr, addr, baddr, et_dyn_addr, entry, proghdr; 747 int32_t osrel; 748 int error, i, n, interp_name_len, have_interp; 749 750 hdr = (const Elf_Ehdr *)imgp->image_header; 751 752 /* 753 * Do we have a valid ELF header ? 754 * 755 * Only allow ET_EXEC & ET_DYN here, reject ET_DYN later 756 * if particular brand doesn't support it. 757 */ 758 if (__elfN(check_header)(hdr) != 0 || 759 (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN)) 760 return (-1); 761 762 /* 763 * From here on down, we return an errno, not -1, as we've 764 * detected an ELF file. 765 */ 766 767 if ((hdr->e_phoff > PAGE_SIZE) || 768 (u_int)hdr->e_phentsize * hdr->e_phnum > PAGE_SIZE - hdr->e_phoff) { 769 /* Only support headers in first page for now */ 770 uprintf("Program headers not in the first page\n"); 771 return (ENOEXEC); 772 } 773 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 774 if (!aligned(phdr, Elf_Addr)) { 775 uprintf("Unaligned program headers\n"); 776 return (ENOEXEC); 777 } 778 779 n = error = 0; 780 baddr = 0; 781 osrel = 0; 782 text_size = data_size = total_size = text_addr = data_addr = 0; 783 entry = proghdr = 0; 784 interp_name_len = 0; 785 err_str = newinterp = NULL; 786 interp = interp_buf = NULL; 787 td = curthread; 788 789 for (i = 0; i < hdr->e_phnum; i++) { 790 switch (phdr[i].p_type) { 791 case PT_LOAD: 792 if (n == 0) 793 baddr = phdr[i].p_vaddr; 794 n++; 795 break; 796 case PT_INTERP: 797 /* Path to interpreter */ 798 if (phdr[i].p_filesz > MAXPATHLEN) { 799 uprintf("Invalid PT_INTERP\n"); 800 error = ENOEXEC; 801 goto ret; 802 } 803 if (interp != NULL) { 804 uprintf("Multiple PT_INTERP headers\n"); 805 error = ENOEXEC; 806 goto ret; 807 } 808 interp_name_len = phdr[i].p_filesz; 809 if (phdr[i].p_offset > PAGE_SIZE || 810 interp_name_len > PAGE_SIZE - phdr[i].p_offset) { 811 VOP_UNLOCK(imgp->vp, 0); 812 interp_buf = malloc(interp_name_len + 1, M_TEMP, 813 M_WAITOK); 814 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY); 815 error = vn_rdwr(UIO_READ, imgp->vp, interp_buf, 816 interp_name_len, phdr[i].p_offset, 817 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, 818 NOCRED, NULL, td); 819 if (error != 0) { 820 uprintf("i/o error PT_INTERP\n"); 821 goto ret; 822 } 823 interp_buf[interp_name_len] = '\0'; 824 interp = interp_buf; 825 } else { 826 interp = __DECONST(char *, imgp->image_header) + 827 phdr[i].p_offset; 828 } 829 break; 830 case PT_GNU_STACK: 831 if (__elfN(nxstack)) 832 imgp->stack_prot = 833 __elfN(trans_prot)(phdr[i].p_flags); 834 imgp->stack_sz = phdr[i].p_memsz; 835 break; 836 } 837 } 838 839 brand_info = __elfN(get_brandinfo)(imgp, interp, interp_name_len, 840 &osrel); 841 if (brand_info == NULL) { 842 uprintf("ELF binary type \"%u\" not known.\n", 843 hdr->e_ident[EI_OSABI]); 844 error = ENOEXEC; 845 goto ret; 846 } 847 if (hdr->e_type == ET_DYN) { 848 if ((brand_info->flags & BI_CAN_EXEC_DYN) == 0) { 849 uprintf("Cannot execute shared object\n"); 850 error = ENOEXEC; 851 goto ret; 852 } 853 /* 854 * Honour the base load address from the dso if it is 855 * non-zero for some reason. 856 */ 857 if (baddr == 0) 858 et_dyn_addr = ET_DYN_LOAD_ADDR; 859 else 860 et_dyn_addr = 0; 861 } else 862 et_dyn_addr = 0; 863 sv = brand_info->sysvec; 864 if (interp != NULL && brand_info->interp_newpath != NULL) 865 newinterp = brand_info->interp_newpath; 866 867 /* 868 * Avoid a possible deadlock if the current address space is destroyed 869 * and that address space maps the locked vnode. In the common case, 870 * the locked vnode's v_usecount is decremented but remains greater 871 * than zero. Consequently, the vnode lock is not needed by vrele(). 872 * However, in cases where the vnode lock is external, such as nullfs, 873 * v_usecount may become zero. 874 * 875 * The VV_TEXT flag prevents modifications to the executable while 876 * the vnode is unlocked. 877 */ 878 VOP_UNLOCK(imgp->vp, 0); 879 880 error = exec_new_vmspace(imgp, sv); 881 imgp->proc->p_sysent = sv; 882 883 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY); 884 if (error != 0) 885 goto ret; 886 887 for (i = 0; i < hdr->e_phnum; i++) { 888 switch (phdr[i].p_type) { 889 case PT_LOAD: /* Loadable segment */ 890 if (phdr[i].p_memsz == 0) 891 break; 892 prot = __elfN(trans_prot)(phdr[i].p_flags); 893 error = __elfN(load_section)(imgp, phdr[i].p_offset, 894 (caddr_t)(uintptr_t)phdr[i].p_vaddr + et_dyn_addr, 895 phdr[i].p_memsz, phdr[i].p_filesz, prot, 896 sv->sv_pagesize); 897 if (error != 0) 898 goto ret; 899 900 /* 901 * If this segment contains the program headers, 902 * remember their virtual address for the AT_PHDR 903 * aux entry. Static binaries don't usually include 904 * a PT_PHDR entry. 905 */ 906 if (phdr[i].p_offset == 0 && 907 hdr->e_phoff + hdr->e_phnum * hdr->e_phentsize 908 <= phdr[i].p_filesz) 909 proghdr = phdr[i].p_vaddr + hdr->e_phoff + 910 et_dyn_addr; 911 912 seg_addr = trunc_page(phdr[i].p_vaddr + et_dyn_addr); 913 seg_size = round_page(phdr[i].p_memsz + 914 phdr[i].p_vaddr + et_dyn_addr - seg_addr); 915 916 /* 917 * Make the largest executable segment the official 918 * text segment and all others data. 919 * 920 * Note that obreak() assumes that data_addr + 921 * data_size == end of data load area, and the ELF 922 * file format expects segments to be sorted by 923 * address. If multiple data segments exist, the 924 * last one will be used. 925 */ 926 927 if (phdr[i].p_flags & PF_X && text_size < seg_size) { 928 text_size = seg_size; 929 text_addr = seg_addr; 930 } else { 931 data_size = seg_size; 932 data_addr = seg_addr; 933 } 934 total_size += seg_size; 935 break; 936 case PT_PHDR: /* Program header table info */ 937 proghdr = phdr[i].p_vaddr + et_dyn_addr; 938 break; 939 default: 940 break; 941 } 942 } 943 944 if (data_addr == 0 && data_size == 0) { 945 data_addr = text_addr; 946 data_size = text_size; 947 } 948 949 entry = (u_long)hdr->e_entry + et_dyn_addr; 950 951 /* 952 * Check limits. It should be safe to check the 953 * limits after loading the segments since we do 954 * not actually fault in all the segments pages. 955 */ 956 PROC_LOCK(imgp->proc); 957 if (data_size > lim_cur(imgp->proc, RLIMIT_DATA)) 958 err_str = "Data segment size exceeds process limit"; 959 else if (text_size > maxtsiz) 960 err_str = "Text segment size exceeds system limit"; 961 else if (total_size > lim_cur(imgp->proc, RLIMIT_VMEM)) 962 err_str = "Total segment size exceeds process limit"; 963 else if (racct_set(imgp->proc, RACCT_DATA, data_size) != 0) 964 err_str = "Data segment size exceeds resource limit"; 965 else if (racct_set(imgp->proc, RACCT_VMEM, total_size) != 0) 966 err_str = "Total segment size exceeds resource limit"; 967 if (err_str != NULL) { 968 PROC_UNLOCK(imgp->proc); 969 uprintf("%s\n", err_str); 970 error = ENOMEM; 971 goto ret; 972 } 973 974 vmspace = imgp->proc->p_vmspace; 975 vmspace->vm_tsize = text_size >> PAGE_SHIFT; 976 vmspace->vm_taddr = (caddr_t)(uintptr_t)text_addr; 977 vmspace->vm_dsize = data_size >> PAGE_SHIFT; 978 vmspace->vm_daddr = (caddr_t)(uintptr_t)data_addr; 979 980 /* 981 * We load the dynamic linker where a userland call 982 * to mmap(0, ...) would put it. The rationale behind this 983 * calculation is that it leaves room for the heap to grow to 984 * its maximum allowed size. 985 */ 986 addr = round_page((vm_offset_t)vmspace->vm_daddr + lim_max(imgp->proc, 987 RLIMIT_DATA)); 988 PROC_UNLOCK(imgp->proc); 989 990 imgp->entry_addr = entry; 991 992 if (interp != NULL) { 993 have_interp = FALSE; 994 VOP_UNLOCK(imgp->vp, 0); 995 if (brand_info->emul_path != NULL && 996 brand_info->emul_path[0] != '\0') { 997 path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 998 snprintf(path, MAXPATHLEN, "%s%s", 999 brand_info->emul_path, interp); 1000 error = __elfN(load_file)(imgp->proc, path, &addr, 1001 &imgp->entry_addr, sv->sv_pagesize); 1002 free(path, M_TEMP); 1003 if (error == 0) 1004 have_interp = TRUE; 1005 } 1006 if (!have_interp && newinterp != NULL && 1007 (brand_info->interp_path == NULL || 1008 strcmp(interp, brand_info->interp_path) == 0)) { 1009 error = __elfN(load_file)(imgp->proc, newinterp, &addr, 1010 &imgp->entry_addr, sv->sv_pagesize); 1011 if (error == 0) 1012 have_interp = TRUE; 1013 } 1014 if (!have_interp) { 1015 error = __elfN(load_file)(imgp->proc, interp, &addr, 1016 &imgp->entry_addr, sv->sv_pagesize); 1017 } 1018 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY); 1019 if (error != 0) { 1020 uprintf("ELF interpreter %s not found, error %d\n", 1021 interp, error); 1022 goto ret; 1023 } 1024 } else 1025 addr = et_dyn_addr; 1026 1027 /* 1028 * Construct auxargs table (used by the fixup routine) 1029 */ 1030 elf_auxargs = malloc(sizeof(Elf_Auxargs), M_TEMP, M_WAITOK); 1031 elf_auxargs->execfd = -1; 1032 elf_auxargs->phdr = proghdr; 1033 elf_auxargs->phent = hdr->e_phentsize; 1034 elf_auxargs->phnum = hdr->e_phnum; 1035 elf_auxargs->pagesz = PAGE_SIZE; 1036 elf_auxargs->base = addr; 1037 elf_auxargs->flags = 0; 1038 elf_auxargs->entry = entry; 1039 1040 imgp->auxargs = elf_auxargs; 1041 imgp->interpreted = 0; 1042 imgp->reloc_base = addr; 1043 imgp->proc->p_osrel = osrel; 1044 imgp->proc->p_elf_machine = hdr->e_machine; 1045 imgp->proc->p_elf_flags = hdr->e_flags; 1046 1047 ret: 1048 free(interp_buf, M_TEMP); 1049 return (error); 1050} 1051 1052#define suword __CONCAT(suword, __ELF_WORD_SIZE) 1053 1054int 1055__elfN(freebsd_fixup)(register_t **stack_base, struct image_params *imgp) 1056{ 1057 Elf_Auxargs *args = (Elf_Auxargs *)imgp->auxargs; 1058 Elf_Addr *base; 1059 Elf_Addr *pos; 1060 1061 base = (Elf_Addr *)*stack_base; 1062 pos = base + (imgp->args->argc + imgp->args->envc + 2); 1063 1064 if (args->execfd != -1) 1065 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd); 1066 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr); 1067 AUXARGS_ENTRY(pos, AT_PHENT, args->phent); 1068 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum); 1069 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz); 1070 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags); 1071 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry); 1072 AUXARGS_ENTRY(pos, AT_BASE, args->base); 1073 if (imgp->execpathp != 0) 1074 AUXARGS_ENTRY(pos, AT_EXECPATH, imgp->execpathp); 1075 AUXARGS_ENTRY(pos, AT_OSRELDATE, 1076 imgp->proc->p_ucred->cr_prison->pr_osreldate); 1077 if (imgp->canary != 0) { 1078 AUXARGS_ENTRY(pos, AT_CANARY, imgp->canary); 1079 AUXARGS_ENTRY(pos, AT_CANARYLEN, imgp->canarylen); 1080 } 1081 AUXARGS_ENTRY(pos, AT_NCPUS, mp_ncpus); 1082 if (imgp->pagesizes != 0) { 1083 AUXARGS_ENTRY(pos, AT_PAGESIZES, imgp->pagesizes); 1084 AUXARGS_ENTRY(pos, AT_PAGESIZESLEN, imgp->pagesizeslen); 1085 } 1086 if (imgp->sysent->sv_timekeep_base != 0) { 1087 AUXARGS_ENTRY(pos, AT_TIMEKEEP, 1088 imgp->sysent->sv_timekeep_base); 1089 } 1090 AUXARGS_ENTRY(pos, AT_STACKPROT, imgp->sysent->sv_shared_page_obj 1091 != NULL && imgp->stack_prot != 0 ? imgp->stack_prot : 1092 imgp->sysent->sv_stackprot); 1093 AUXARGS_ENTRY(pos, AT_NULL, 0); 1094 1095 free(imgp->auxargs, M_TEMP); 1096 imgp->auxargs = NULL; 1097 1098 base--; 1099 suword(base, (long)imgp->args->argc); 1100 *stack_base = (register_t *)base; 1101 return (0); 1102} 1103 1104/* 1105 * Code for generating ELF core dumps. 1106 */ 1107 1108typedef void (*segment_callback)(vm_map_entry_t, void *); 1109 1110/* Closure for cb_put_phdr(). */ 1111struct phdr_closure { 1112 Elf_Phdr *phdr; /* Program header to fill in */ 1113 Elf_Off offset; /* Offset of segment in core file */ 1114}; 1115 1116/* Closure for cb_size_segment(). */ 1117struct sseg_closure { 1118 int count; /* Count of writable segments. */ 1119 size_t size; /* Total size of all writable segments. */ 1120}; 1121 1122typedef void (*outfunc_t)(void *, struct sbuf *, size_t *); 1123 1124struct note_info { 1125 int type; /* Note type. */ 1126 outfunc_t outfunc; /* Output function. */ 1127 void *outarg; /* Argument for the output function. */ 1128 size_t outsize; /* Output size. */ 1129 TAILQ_ENTRY(note_info) link; /* Link to the next note info. */ 1130}; 1131 1132TAILQ_HEAD(note_info_list, note_info); 1133 1134static void cb_put_phdr(vm_map_entry_t, void *); 1135static void cb_size_segment(vm_map_entry_t, void *); 1136static void each_writable_segment(struct thread *, segment_callback, void *); 1137static int __elfN(corehdr)(struct thread *, struct vnode *, struct ucred *, 1138 int, void *, size_t, struct note_info_list *, size_t, gzFile); 1139static void __elfN(prepare_notes)(struct thread *, struct note_info_list *, 1140 size_t *); 1141static void __elfN(puthdr)(struct thread *, void *, size_t, int, size_t); 1142static void __elfN(putnote)(struct note_info *, struct sbuf *); 1143static size_t register_note(struct note_info_list *, int, outfunc_t, void *); 1144static int sbuf_drain_core_output(void *, const char *, int); 1145static int sbuf_drain_count(void *arg, const char *data, int len); 1146 1147static void __elfN(note_fpregset)(void *, struct sbuf *, size_t *); 1148static void __elfN(note_prpsinfo)(void *, struct sbuf *, size_t *); 1149static void __elfN(note_prstatus)(void *, struct sbuf *, size_t *); 1150static void __elfN(note_threadmd)(void *, struct sbuf *, size_t *); 1151static void __elfN(note_thrmisc)(void *, struct sbuf *, size_t *); 1152static void __elfN(note_procstat_auxv)(void *, struct sbuf *, size_t *); 1153static void __elfN(note_procstat_proc)(void *, struct sbuf *, size_t *); 1154static void __elfN(note_procstat_psstrings)(void *, struct sbuf *, size_t *); 1155static void note_procstat_files(void *, struct sbuf *, size_t *); 1156static void note_procstat_groups(void *, struct sbuf *, size_t *); 1157static void note_procstat_osrel(void *, struct sbuf *, size_t *); 1158static void note_procstat_rlimit(void *, struct sbuf *, size_t *); 1159static void note_procstat_umask(void *, struct sbuf *, size_t *); 1160static void note_procstat_vmmap(void *, struct sbuf *, size_t *); 1161 1162#ifdef COMPRESS_USER_CORES 1163extern int compress_user_cores; 1164extern int compress_user_cores_gzlevel; 1165#endif 1166 1167static int 1168core_output(struct vnode *vp, void *base, size_t len, off_t offset, 1169 struct ucred *active_cred, struct ucred *file_cred, 1170 struct thread *td, char *core_buf, gzFile gzfile) { 1171 1172 int error; 1173 if (gzfile) { 1174#ifdef COMPRESS_USER_CORES 1175 error = compress_core(gzfile, base, core_buf, len, td); 1176#else 1177 panic("shouldn't be here"); 1178#endif 1179 } else { 1180 /* 1181 * EFAULT is a non-fatal error that we can get, for example, 1182 * if the segment is backed by a file but extends beyond its 1183 * end. 1184 */ 1185 error = vn_rdwr_inchunks(UIO_WRITE, vp, base, len, offset, 1186 UIO_USERSPACE, IO_UNIT | IO_DIRECT, active_cred, file_cred, 1187 NULL, td); 1188 if (error == EFAULT) { 1189 log(LOG_WARNING, "Failed to fully fault in a core file " 1190 "segment at VA %p with size 0x%zx to be written at " 1191 "offset 0x%jx for process %s\n", base, len, offset, 1192 curproc->p_comm); 1193 1194 /* 1195 * Write a "real" zero byte at the end of the target 1196 * region in the case this is the last segment. 1197 * The intermediate space will be implicitly 1198 * zero-filled. 1199 */ 1200 error = vn_rdwr_inchunks(UIO_WRITE, vp, 1201 __DECONST(void *, zero_region), 1, offset + len - 1, 1202 UIO_SYSSPACE, IO_UNIT | IO_DIRECT, active_cred, 1203 file_cred, NULL, td); 1204 } 1205 } 1206 return (error); 1207} 1208 1209/* Coredump output parameters for sbuf drain routine. */ 1210struct sbuf_drain_core_params { 1211 off_t offset; 1212 struct ucred *active_cred; 1213 struct ucred *file_cred; 1214 struct thread *td; 1215 struct vnode *vp; 1216#ifdef COMPRESS_USER_CORES 1217 gzFile gzfile; 1218#endif 1219}; 1220 1221/* 1222 * Drain into a core file. 1223 */ 1224static int 1225sbuf_drain_core_output(void *arg, const char *data, int len) 1226{ 1227 struct sbuf_drain_core_params *p; 1228 int error, locked; 1229 1230 p = (struct sbuf_drain_core_params *)arg; 1231 1232 /* 1233 * Some kern_proc out routines that print to this sbuf may 1234 * call us with the process lock held. Draining with the 1235 * non-sleepable lock held is unsafe. The lock is needed for 1236 * those routines when dumping a live process. In our case we 1237 * can safely release the lock before draining and acquire 1238 * again after. 1239 */ 1240 locked = PROC_LOCKED(p->td->td_proc); 1241 if (locked) 1242 PROC_UNLOCK(p->td->td_proc); 1243#ifdef COMPRESS_USER_CORES 1244 if (p->gzfile != Z_NULL) 1245 error = compress_core(p->gzfile, NULL, __DECONST(char *, data), 1246 len, p->td); 1247 else 1248#endif 1249 error = vn_rdwr_inchunks(UIO_WRITE, p->vp, 1250 __DECONST(void *, data), len, p->offset, UIO_SYSSPACE, 1251 IO_UNIT | IO_DIRECT, p->active_cred, p->file_cred, NULL, 1252 p->td); 1253 if (locked) 1254 PROC_LOCK(p->td->td_proc); 1255 if (error != 0) 1256 return (-error); 1257 p->offset += len; 1258 return (len); 1259} 1260 1261/* 1262 * Drain into a counter. 1263 */ 1264static int 1265sbuf_drain_count(void *arg, const char *data __unused, int len) 1266{ 1267 size_t *sizep; 1268 1269 sizep = (size_t *)arg; 1270 *sizep += len; 1271 return (len); 1272} 1273 1274int 1275__elfN(coredump)(struct thread *td, struct vnode *vp, off_t limit, int flags) 1276{ 1277 struct ucred *cred = td->td_ucred; 1278 int error = 0; 1279 struct sseg_closure seginfo; 1280 struct note_info_list notelst; 1281 struct note_info *ninfo; 1282 void *hdr; 1283 size_t hdrsize, notesz, coresize; 1284 1285 gzFile gzfile = Z_NULL; 1286 char *core_buf = NULL; 1287#ifdef COMPRESS_USER_CORES 1288 char gzopen_flags[8]; 1289 char *p; 1290 int doing_compress = flags & IMGACT_CORE_COMPRESS; 1291#endif 1292 1293 hdr = NULL; 1294 TAILQ_INIT(¬elst); 1295 1296#ifdef COMPRESS_USER_CORES 1297 if (doing_compress) { 1298 p = gzopen_flags; 1299 *p++ = 'w'; 1300 if (compress_user_cores_gzlevel >= 0 && 1301 compress_user_cores_gzlevel <= 9) 1302 *p++ = '0' + compress_user_cores_gzlevel; 1303 *p = 0; 1304 gzfile = gz_open("", gzopen_flags, vp); 1305 if (gzfile == Z_NULL) { 1306 error = EFAULT; 1307 goto done; 1308 } 1309 core_buf = malloc(CORE_BUF_SIZE, M_TEMP, M_WAITOK | M_ZERO); 1310 if (!core_buf) { 1311 error = ENOMEM; 1312 goto done; 1313 } 1314 } 1315#endif 1316 1317 /* Size the program segments. */ 1318 seginfo.count = 0; 1319 seginfo.size = 0; 1320 each_writable_segment(td, cb_size_segment, &seginfo); 1321 1322 /* 1323 * Collect info about the core file header area. 1324 */ 1325 hdrsize = sizeof(Elf_Ehdr) + sizeof(Elf_Phdr) * (1 + seginfo.count); 1326 __elfN(prepare_notes)(td, ¬elst, ¬esz); 1327 coresize = round_page(hdrsize + notesz) + seginfo.size; 1328 1329#ifdef RACCT 1330 if (racct_enable) { 1331 PROC_LOCK(td->td_proc); 1332 error = racct_add(td->td_proc, RACCT_CORE, coresize); 1333 PROC_UNLOCK(td->td_proc); 1334 if (error != 0) { 1335 error = EFAULT; 1336 goto done; 1337 } 1338 } 1339#endif 1340 if (coresize >= limit) { 1341 error = EFAULT; 1342 goto done; 1343 } 1344 1345 /* 1346 * Allocate memory for building the header, fill it up, 1347 * and write it out following the notes. 1348 */ 1349 hdr = malloc(hdrsize, M_TEMP, M_WAITOK); 1350 error = __elfN(corehdr)(td, vp, cred, seginfo.count, hdr, hdrsize, 1351 ¬elst, notesz, gzfile); 1352 1353 /* Write the contents of all of the writable segments. */ 1354 if (error == 0) { 1355 Elf_Phdr *php; 1356 off_t offset; 1357 int i; 1358 1359 php = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr)) + 1; 1360 offset = round_page(hdrsize + notesz); 1361 for (i = 0; i < seginfo.count; i++) { 1362 error = core_output(vp, (caddr_t)(uintptr_t)php->p_vaddr, 1363 php->p_filesz, offset, cred, NOCRED, curthread, core_buf, gzfile); 1364 if (error != 0) 1365 break; 1366 offset += php->p_filesz; 1367 php++; 1368 } 1369 } 1370 if (error) { 1371 log(LOG_WARNING, 1372 "Failed to write core file for process %s (error %d)\n", 1373 curproc->p_comm, error); 1374 } 1375 1376done: 1377#ifdef COMPRESS_USER_CORES 1378 if (core_buf) 1379 free(core_buf, M_TEMP); 1380 if (gzfile) 1381 gzclose(gzfile); 1382#endif 1383 while ((ninfo = TAILQ_FIRST(¬elst)) != NULL) { 1384 TAILQ_REMOVE(¬elst, ninfo, link); 1385 free(ninfo, M_TEMP); 1386 } 1387 if (hdr != NULL) 1388 free(hdr, M_TEMP); 1389 1390 return (error); 1391} 1392 1393/* 1394 * A callback for each_writable_segment() to write out the segment's 1395 * program header entry. 1396 */ 1397static void 1398cb_put_phdr(entry, closure) 1399 vm_map_entry_t entry; 1400 void *closure; 1401{ 1402 struct phdr_closure *phc = (struct phdr_closure *)closure; 1403 Elf_Phdr *phdr = phc->phdr; 1404 1405 phc->offset = round_page(phc->offset); 1406 1407 phdr->p_type = PT_LOAD; 1408 phdr->p_offset = phc->offset; 1409 phdr->p_vaddr = entry->start; 1410 phdr->p_paddr = 0; 1411 phdr->p_filesz = phdr->p_memsz = entry->end - entry->start; 1412 phdr->p_align = PAGE_SIZE; 1413 phdr->p_flags = __elfN(untrans_prot)(entry->protection); 1414 1415 phc->offset += phdr->p_filesz; 1416 phc->phdr++; 1417} 1418 1419/* 1420 * A callback for each_writable_segment() to gather information about 1421 * the number of segments and their total size. 1422 */ 1423static void 1424cb_size_segment(entry, closure) 1425 vm_map_entry_t entry; 1426 void *closure; 1427{ 1428 struct sseg_closure *ssc = (struct sseg_closure *)closure; 1429 1430 ssc->count++; 1431 ssc->size += entry->end - entry->start; 1432} 1433 1434/* 1435 * For each writable segment in the process's memory map, call the given 1436 * function with a pointer to the map entry and some arbitrary 1437 * caller-supplied data. 1438 */ 1439static void 1440each_writable_segment(td, func, closure) 1441 struct thread *td; 1442 segment_callback func; 1443 void *closure; 1444{ 1445 struct proc *p = td->td_proc; 1446 vm_map_t map = &p->p_vmspace->vm_map; 1447 vm_map_entry_t entry; 1448 vm_object_t backing_object, object; 1449 boolean_t ignore_entry; 1450 1451 vm_map_lock_read(map); 1452 for (entry = map->header.next; entry != &map->header; 1453 entry = entry->next) { 1454 /* 1455 * Don't dump inaccessible mappings, deal with legacy 1456 * coredump mode. 1457 * 1458 * Note that read-only segments related to the elf binary 1459 * are marked MAP_ENTRY_NOCOREDUMP now so we no longer 1460 * need to arbitrarily ignore such segments. 1461 */ 1462 if (elf_legacy_coredump) { 1463 if ((entry->protection & VM_PROT_RW) != VM_PROT_RW) 1464 continue; 1465 } else { 1466 if ((entry->protection & VM_PROT_ALL) == 0) 1467 continue; 1468 } 1469 1470 /* 1471 * Dont include memory segment in the coredump if 1472 * MAP_NOCORE is set in mmap(2) or MADV_NOCORE in 1473 * madvise(2). Do not dump submaps (i.e. parts of the 1474 * kernel map). 1475 */ 1476 if (entry->eflags & (MAP_ENTRY_NOCOREDUMP|MAP_ENTRY_IS_SUB_MAP)) 1477 continue; 1478 1479 if ((object = entry->object.vm_object) == NULL) 1480 continue; 1481 1482 /* Ignore memory-mapped devices and such things. */ 1483 VM_OBJECT_RLOCK(object); 1484 while ((backing_object = object->backing_object) != NULL) { 1485 VM_OBJECT_RLOCK(backing_object); 1486 VM_OBJECT_RUNLOCK(object); 1487 object = backing_object; 1488 } 1489 ignore_entry = object->type != OBJT_DEFAULT && 1490 object->type != OBJT_SWAP && object->type != OBJT_VNODE && 1491 object->type != OBJT_PHYS; 1492 VM_OBJECT_RUNLOCK(object); 1493 if (ignore_entry) 1494 continue; 1495 1496 (*func)(entry, closure); 1497 } 1498 vm_map_unlock_read(map); 1499} 1500 1501/* 1502 * Write the core file header to the file, including padding up to 1503 * the page boundary. 1504 */ 1505static int 1506__elfN(corehdr)(struct thread *td, struct vnode *vp, struct ucred *cred, 1507 int numsegs, void *hdr, size_t hdrsize, struct note_info_list *notelst, 1508 size_t notesz, gzFile gzfile) 1509{ 1510 struct sbuf_drain_core_params params; 1511 struct note_info *ninfo; 1512 struct sbuf *sb; 1513 int error; 1514 1515 /* Fill in the header. */ 1516 bzero(hdr, hdrsize); 1517 __elfN(puthdr)(td, hdr, hdrsize, numsegs, notesz); 1518 1519 params.offset = 0; 1520 params.active_cred = cred; 1521 params.file_cred = NOCRED; 1522 params.td = td; 1523 params.vp = vp; 1524#ifdef COMPRESS_USER_CORES 1525 params.gzfile = gzfile; 1526#endif 1527 sb = sbuf_new(NULL, NULL, CORE_BUF_SIZE, SBUF_FIXEDLEN); 1528 sbuf_set_drain(sb, sbuf_drain_core_output, ¶ms); 1529 sbuf_start_section(sb, NULL); 1530 sbuf_bcat(sb, hdr, hdrsize); 1531 TAILQ_FOREACH(ninfo, notelst, link) 1532 __elfN(putnote)(ninfo, sb); 1533 /* Align up to a page boundary for the program segments. */ 1534 sbuf_end_section(sb, -1, PAGE_SIZE, 0); 1535 error = sbuf_finish(sb); 1536 sbuf_delete(sb); 1537 1538 return (error); 1539} 1540 1541static void 1542__elfN(prepare_notes)(struct thread *td, struct note_info_list *list, 1543 size_t *sizep) 1544{ 1545 struct proc *p; 1546 struct thread *thr; 1547 size_t size; 1548 1549 p = td->td_proc; 1550 size = 0; 1551 1552 size += register_note(list, NT_PRPSINFO, __elfN(note_prpsinfo), p); 1553 1554 /* 1555 * To have the debugger select the right thread (LWP) as the initial 1556 * thread, we dump the state of the thread passed to us in td first. 1557 * This is the thread that causes the core dump and thus likely to 1558 * be the right thread one wants to have selected in the debugger. 1559 */ 1560 thr = td; 1561 while (thr != NULL) { 1562 size += register_note(list, NT_PRSTATUS, 1563 __elfN(note_prstatus), thr); 1564 size += register_note(list, NT_FPREGSET, 1565 __elfN(note_fpregset), thr); 1566 size += register_note(list, NT_THRMISC, 1567 __elfN(note_thrmisc), thr); 1568 size += register_note(list, -1, 1569 __elfN(note_threadmd), thr); 1570 1571 thr = (thr == td) ? TAILQ_FIRST(&p->p_threads) : 1572 TAILQ_NEXT(thr, td_plist); 1573 if (thr == td) 1574 thr = TAILQ_NEXT(thr, td_plist); 1575 } 1576 1577 size += register_note(list, NT_PROCSTAT_PROC, 1578 __elfN(note_procstat_proc), p); 1579 size += register_note(list, NT_PROCSTAT_FILES, 1580 note_procstat_files, p); 1581 size += register_note(list, NT_PROCSTAT_VMMAP, 1582 note_procstat_vmmap, p); 1583 size += register_note(list, NT_PROCSTAT_GROUPS, 1584 note_procstat_groups, p); 1585 size += register_note(list, NT_PROCSTAT_UMASK, 1586 note_procstat_umask, p); 1587 size += register_note(list, NT_PROCSTAT_RLIMIT, 1588 note_procstat_rlimit, p); 1589 size += register_note(list, NT_PROCSTAT_OSREL, 1590 note_procstat_osrel, p); 1591 size += register_note(list, NT_PROCSTAT_PSSTRINGS, 1592 __elfN(note_procstat_psstrings), p); 1593 size += register_note(list, NT_PROCSTAT_AUXV, 1594 __elfN(note_procstat_auxv), p); 1595 1596 *sizep = size; 1597} 1598 1599static void 1600__elfN(puthdr)(struct thread *td, void *hdr, size_t hdrsize, int numsegs, 1601 size_t notesz) 1602{ 1603 Elf_Ehdr *ehdr; 1604 Elf_Phdr *phdr; 1605 struct phdr_closure phc; 1606 1607 ehdr = (Elf_Ehdr *)hdr; 1608 phdr = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr)); 1609 1610 ehdr->e_ident[EI_MAG0] = ELFMAG0; 1611 ehdr->e_ident[EI_MAG1] = ELFMAG1; 1612 ehdr->e_ident[EI_MAG2] = ELFMAG2; 1613 ehdr->e_ident[EI_MAG3] = ELFMAG3; 1614 ehdr->e_ident[EI_CLASS] = ELF_CLASS; 1615 ehdr->e_ident[EI_DATA] = ELF_DATA; 1616 ehdr->e_ident[EI_VERSION] = EV_CURRENT; 1617 ehdr->e_ident[EI_OSABI] = ELFOSABI_FREEBSD; 1618 ehdr->e_ident[EI_ABIVERSION] = 0; 1619 ehdr->e_ident[EI_PAD] = 0; 1620 ehdr->e_type = ET_CORE; 1621 ehdr->e_machine = td->td_proc->p_elf_machine; 1622 ehdr->e_version = EV_CURRENT; 1623 ehdr->e_entry = 0; 1624 ehdr->e_phoff = sizeof(Elf_Ehdr); 1625 ehdr->e_flags = td->td_proc->p_elf_flags; 1626 ehdr->e_ehsize = sizeof(Elf_Ehdr); 1627 ehdr->e_phentsize = sizeof(Elf_Phdr); 1628 ehdr->e_phnum = numsegs + 1; 1629 ehdr->e_shentsize = sizeof(Elf_Shdr); 1630 ehdr->e_shnum = 0; 1631 ehdr->e_shstrndx = SHN_UNDEF; 1632 1633 /* 1634 * Fill in the program header entries. 1635 */ 1636 1637 /* The note segement. */ 1638 phdr->p_type = PT_NOTE; 1639 phdr->p_offset = hdrsize; 1640 phdr->p_vaddr = 0; 1641 phdr->p_paddr = 0; 1642 phdr->p_filesz = notesz; 1643 phdr->p_memsz = 0; 1644 phdr->p_flags = PF_R; 1645 phdr->p_align = ELF_NOTE_ROUNDSIZE; 1646 phdr++; 1647 1648 /* All the writable segments from the program. */ 1649 phc.phdr = phdr; 1650 phc.offset = round_page(hdrsize + notesz); 1651 each_writable_segment(td, cb_put_phdr, &phc); 1652} 1653 1654static size_t 1655register_note(struct note_info_list *list, int type, outfunc_t out, void *arg) 1656{ 1657 struct note_info *ninfo; 1658 size_t size, notesize; 1659 1660 size = 0; 1661 out(arg, NULL, &size); 1662 ninfo = malloc(sizeof(*ninfo), M_TEMP, M_ZERO | M_WAITOK); 1663 ninfo->type = type; 1664 ninfo->outfunc = out; 1665 ninfo->outarg = arg; 1666 ninfo->outsize = size; 1667 TAILQ_INSERT_TAIL(list, ninfo, link); 1668 1669 if (type == -1) 1670 return (size); 1671 1672 notesize = sizeof(Elf_Note) + /* note header */ 1673 roundup2(sizeof(FREEBSD_ABI_VENDOR), ELF_NOTE_ROUNDSIZE) + 1674 /* note name */ 1675 roundup2(size, ELF_NOTE_ROUNDSIZE); /* note description */ 1676 1677 return (notesize); 1678} 1679 1680static size_t 1681append_note_data(const void *src, void *dst, size_t len) 1682{ 1683 size_t padded_len; 1684 1685 padded_len = roundup2(len, ELF_NOTE_ROUNDSIZE); 1686 if (dst != NULL) { 1687 bcopy(src, dst, len); 1688 bzero((char *)dst + len, padded_len - len); 1689 } 1690 return (padded_len); 1691} 1692 1693size_t 1694__elfN(populate_note)(int type, void *src, void *dst, size_t size, void **descp) 1695{ 1696 Elf_Note *note; 1697 char *buf; 1698 size_t notesize; 1699 1700 buf = dst; 1701 if (buf != NULL) { 1702 note = (Elf_Note *)buf; 1703 note->n_namesz = sizeof(FREEBSD_ABI_VENDOR); 1704 note->n_descsz = size; 1705 note->n_type = type; 1706 buf += sizeof(*note); 1707 buf += append_note_data(FREEBSD_ABI_VENDOR, buf, 1708 sizeof(FREEBSD_ABI_VENDOR)); 1709 append_note_data(src, buf, size); 1710 if (descp != NULL) 1711 *descp = buf; 1712 } 1713 1714 notesize = sizeof(Elf_Note) + /* note header */ 1715 roundup2(sizeof(FREEBSD_ABI_VENDOR), ELF_NOTE_ROUNDSIZE) + 1716 /* note name */ 1717 roundup2(size, ELF_NOTE_ROUNDSIZE); /* note description */ 1718 1719 return (notesize); 1720} 1721 1722static void 1723__elfN(putnote)(struct note_info *ninfo, struct sbuf *sb) 1724{ 1725 Elf_Note note; 1726 ssize_t old_len, sect_len; 1727 size_t new_len, descsz, i; 1728 1729 if (ninfo->type == -1) { 1730 ninfo->outfunc(ninfo->outarg, sb, &ninfo->outsize); 1731 return; 1732 } 1733 1734 note.n_namesz = sizeof(FREEBSD_ABI_VENDOR); 1735 note.n_descsz = ninfo->outsize; 1736 note.n_type = ninfo->type; 1737 1738 sbuf_bcat(sb, ¬e, sizeof(note)); 1739 sbuf_start_section(sb, &old_len); 1740 sbuf_bcat(sb, FREEBSD_ABI_VENDOR, sizeof(FREEBSD_ABI_VENDOR)); 1741 sbuf_end_section(sb, old_len, ELF_NOTE_ROUNDSIZE, 0); 1742 if (note.n_descsz == 0) 1743 return; 1744 sbuf_start_section(sb, &old_len); 1745 ninfo->outfunc(ninfo->outarg, sb, &ninfo->outsize); 1746 sect_len = sbuf_end_section(sb, old_len, ELF_NOTE_ROUNDSIZE, 0); 1747 if (sect_len < 0) 1748 return; 1749 1750 new_len = (size_t)sect_len; 1751 descsz = roundup(note.n_descsz, ELF_NOTE_ROUNDSIZE); 1752 if (new_len < descsz) { 1753 /* 1754 * It is expected that individual note emitters will correctly 1755 * predict their expected output size and fill up to that size 1756 * themselves, padding in a format-specific way if needed. 1757 * However, in case they don't, just do it here with zeros. 1758 */ 1759 for (i = 0; i < descsz - new_len; i++) 1760 sbuf_putc(sb, 0); 1761 } else if (new_len > descsz) { 1762 /* 1763 * We can't always truncate sb -- we may have drained some 1764 * of it already. 1765 */ 1766 KASSERT(new_len == descsz, ("%s: Note type %u changed as we " 1767 "read it (%zu > %zu). Since it is longer than " 1768 "expected, this coredump's notes are corrupt. THIS " 1769 "IS A BUG in the note_procstat routine for type %u.\n", 1770 __func__, (unsigned)note.n_type, new_len, descsz, 1771 (unsigned)note.n_type)); 1772 } 1773} 1774 1775/* 1776 * Miscellaneous note out functions. 1777 */ 1778 1779#if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 1780#include <compat/freebsd32/freebsd32.h> 1781 1782typedef struct prstatus32 elf_prstatus_t; 1783typedef struct prpsinfo32 elf_prpsinfo_t; 1784typedef struct fpreg32 elf_prfpregset_t; 1785typedef struct fpreg32 elf_fpregset_t; 1786typedef struct reg32 elf_gregset_t; 1787typedef struct thrmisc32 elf_thrmisc_t; 1788#define ELF_KERN_PROC_MASK KERN_PROC_MASK32 1789typedef struct kinfo_proc32 elf_kinfo_proc_t; 1790typedef uint32_t elf_ps_strings_t; 1791#else 1792typedef prstatus_t elf_prstatus_t; 1793typedef prpsinfo_t elf_prpsinfo_t; 1794typedef prfpregset_t elf_prfpregset_t; 1795typedef prfpregset_t elf_fpregset_t; 1796typedef gregset_t elf_gregset_t; 1797typedef thrmisc_t elf_thrmisc_t; 1798#define ELF_KERN_PROC_MASK 0 1799typedef struct kinfo_proc elf_kinfo_proc_t; 1800typedef vm_offset_t elf_ps_strings_t; 1801#endif 1802 1803static void 1804__elfN(note_prpsinfo)(void *arg, struct sbuf *sb, size_t *sizep) 1805{ 1806 struct sbuf sbarg; 1807 size_t len; 1808 char *cp, *end; 1809 struct proc *p; 1810 elf_prpsinfo_t *psinfo; 1811 int error; 1812 1813 p = (struct proc *)arg; 1814 if (sb != NULL) { 1815 KASSERT(*sizep == sizeof(*psinfo), ("invalid size")); 1816 psinfo = malloc(sizeof(*psinfo), M_TEMP, M_ZERO | M_WAITOK); 1817 psinfo->pr_version = PRPSINFO_VERSION; 1818 psinfo->pr_psinfosz = sizeof(elf_prpsinfo_t); 1819 strlcpy(psinfo->pr_fname, p->p_comm, sizeof(psinfo->pr_fname)); 1820 PROC_LOCK(p); 1821 if (p->p_args != NULL) { 1822 len = sizeof(psinfo->pr_psargs) - 1; 1823 if (len > p->p_args->ar_length) 1824 len = p->p_args->ar_length; 1825 memcpy(psinfo->pr_psargs, p->p_args->ar_args, len); 1826 PROC_UNLOCK(p); 1827 error = 0; 1828 } else { 1829 _PHOLD(p); 1830 PROC_UNLOCK(p); 1831 sbuf_new(&sbarg, psinfo->pr_psargs, 1832 sizeof(psinfo->pr_psargs), SBUF_FIXEDLEN); 1833 error = proc_getargv(curthread, p, &sbarg); 1834 PRELE(p); 1835 if (sbuf_finish(&sbarg) == 0) 1836 len = sbuf_len(&sbarg) - 1; 1837 else 1838 len = sizeof(psinfo->pr_psargs) - 1; 1839 sbuf_delete(&sbarg); 1840 } 1841 if (error || len == 0) 1842 strlcpy(psinfo->pr_psargs, p->p_comm, 1843 sizeof(psinfo->pr_psargs)); 1844 else { 1845 KASSERT(len < sizeof(psinfo->pr_psargs), 1846 ("len is too long: %zu vs %zu", len, 1847 sizeof(psinfo->pr_psargs))); 1848 cp = psinfo->pr_psargs; 1849 end = cp + len - 1; 1850 for (;;) { 1851 cp = memchr(cp, '\0', end - cp); 1852 if (cp == NULL) 1853 break; 1854 *cp = ' '; 1855 } 1856 } 1857 psinfo->pr_pid = p->p_pid; 1858 sbuf_bcat(sb, psinfo, sizeof(*psinfo)); 1859 free(psinfo, M_TEMP); 1860 } 1861 *sizep = sizeof(*psinfo); 1862} 1863 1864static void 1865__elfN(note_prstatus)(void *arg, struct sbuf *sb, size_t *sizep) 1866{ 1867 struct thread *td; 1868 elf_prstatus_t *status; 1869 1870 td = (struct thread *)arg; 1871 if (sb != NULL) { 1872 KASSERT(*sizep == sizeof(*status), ("invalid size")); 1873 status = malloc(sizeof(*status), M_TEMP, M_ZERO | M_WAITOK); 1874 status->pr_version = PRSTATUS_VERSION; 1875 status->pr_statussz = sizeof(elf_prstatus_t); 1876 status->pr_gregsetsz = sizeof(elf_gregset_t); 1877 status->pr_fpregsetsz = sizeof(elf_fpregset_t); 1878 status->pr_osreldate = osreldate; 1879 status->pr_cursig = td->td_proc->p_sig; 1880 status->pr_pid = td->td_tid; 1881#if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 1882 fill_regs32(td, &status->pr_reg); 1883#else 1884 fill_regs(td, &status->pr_reg); 1885#endif 1886 sbuf_bcat(sb, status, sizeof(*status)); 1887 free(status, M_TEMP); 1888 } 1889 *sizep = sizeof(*status); 1890} 1891 1892static void 1893__elfN(note_fpregset)(void *arg, struct sbuf *sb, size_t *sizep) 1894{ 1895 struct thread *td; 1896 elf_prfpregset_t *fpregset; 1897 1898 td = (struct thread *)arg; 1899 if (sb != NULL) { 1900 KASSERT(*sizep == sizeof(*fpregset), ("invalid size")); 1901 fpregset = malloc(sizeof(*fpregset), M_TEMP, M_ZERO | M_WAITOK); 1902#if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 1903 fill_fpregs32(td, fpregset); 1904#else 1905 fill_fpregs(td, fpregset); 1906#endif 1907 sbuf_bcat(sb, fpregset, sizeof(*fpregset)); 1908 free(fpregset, M_TEMP); 1909 } 1910 *sizep = sizeof(*fpregset); 1911} 1912 1913static void 1914__elfN(note_thrmisc)(void *arg, struct sbuf *sb, size_t *sizep) 1915{ 1916 struct thread *td; 1917 elf_thrmisc_t thrmisc; 1918 1919 td = (struct thread *)arg; 1920 if (sb != NULL) { 1921 KASSERT(*sizep == sizeof(thrmisc), ("invalid size")); 1922 bzero(&thrmisc._pad, sizeof(thrmisc._pad)); 1923 strcpy(thrmisc.pr_tname, td->td_name); 1924 sbuf_bcat(sb, &thrmisc, sizeof(thrmisc)); 1925 } 1926 *sizep = sizeof(thrmisc); 1927} 1928 1929/* 1930 * Allow for MD specific notes, as well as any MD 1931 * specific preparations for writing MI notes. 1932 */ 1933static void 1934__elfN(note_threadmd)(void *arg, struct sbuf *sb, size_t *sizep) 1935{ 1936 struct thread *td; 1937 void *buf; 1938 size_t size; 1939 1940 td = (struct thread *)arg; 1941 size = *sizep; 1942 if (size != 0 && sb != NULL) 1943 buf = malloc(size, M_TEMP, M_ZERO | M_WAITOK); 1944 else 1945 buf = NULL; 1946 size = 0; 1947 __elfN(dump_thread)(td, buf, &size); 1948 KASSERT(sb == NULL || *sizep == size, ("invalid size")); 1949 if (size != 0 && sb != NULL) 1950 sbuf_bcat(sb, buf, size); 1951 free(buf, M_TEMP); 1952 *sizep = size; 1953} 1954 1955#ifdef KINFO_PROC_SIZE 1956CTASSERT(sizeof(struct kinfo_proc) == KINFO_PROC_SIZE); 1957#endif 1958 1959static void 1960__elfN(note_procstat_proc)(void *arg, struct sbuf *sb, size_t *sizep) 1961{ 1962 struct proc *p; 1963 size_t size; 1964 int structsize; 1965 1966 p = (struct proc *)arg; 1967 size = sizeof(structsize) + p->p_numthreads * 1968 sizeof(elf_kinfo_proc_t); 1969 1970 if (sb != NULL) { 1971 KASSERT(*sizep == size, ("invalid size")); 1972 structsize = sizeof(elf_kinfo_proc_t); 1973 sbuf_bcat(sb, &structsize, sizeof(structsize)); 1974 PROC_LOCK(p); 1975 kern_proc_out(p, sb, ELF_KERN_PROC_MASK); 1976 } 1977 *sizep = size; 1978} 1979 1980#ifdef KINFO_FILE_SIZE 1981CTASSERT(sizeof(struct kinfo_file) == KINFO_FILE_SIZE); 1982#endif 1983 1984static void 1985note_procstat_files(void *arg, struct sbuf *sb, size_t *sizep) 1986{ 1987 struct proc *p; 1988 size_t size, sect_sz, i; 1989 ssize_t start_len, sect_len; 1990 int structsize, filedesc_flags; 1991 1992 if (coredump_pack_fileinfo) 1993 filedesc_flags = KERN_FILEDESC_PACK_KINFO; 1994 else 1995 filedesc_flags = 0; 1996 1997 p = (struct proc *)arg; 1998 structsize = sizeof(struct kinfo_file); 1999 if (sb == NULL) { 2000 size = 0; 2001 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN); 2002 sbuf_set_drain(sb, sbuf_drain_count, &size); 2003 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2004 PROC_LOCK(p); 2005 kern_proc_filedesc_out(p, sb, -1, filedesc_flags); 2006 sbuf_finish(sb); 2007 sbuf_delete(sb); 2008 *sizep = size; 2009 } else { 2010 sbuf_start_section(sb, &start_len); 2011 2012 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2013 PROC_LOCK(p); 2014 kern_proc_filedesc_out(p, sb, *sizep - sizeof(structsize), 2015 filedesc_flags); 2016 2017 sect_len = sbuf_end_section(sb, start_len, 0, 0); 2018 if (sect_len < 0) 2019 return; 2020 sect_sz = sect_len; 2021 2022 KASSERT(sect_sz <= *sizep, 2023 ("kern_proc_filedesc_out did not respect maxlen; " 2024 "requested %zu, got %zu", *sizep - sizeof(structsize), 2025 sect_sz - sizeof(structsize))); 2026 2027 for (i = 0; i < *sizep - sect_sz && sb->s_error == 0; i++) 2028 sbuf_putc(sb, 0); 2029 } 2030} 2031 2032#ifdef KINFO_VMENTRY_SIZE 2033CTASSERT(sizeof(struct kinfo_vmentry) == KINFO_VMENTRY_SIZE); 2034#endif 2035 2036static void 2037note_procstat_vmmap(void *arg, struct sbuf *sb, size_t *sizep) 2038{ 2039 struct proc *p; 2040 size_t size; 2041 int structsize, vmmap_flags; 2042 2043 if (coredump_pack_vmmapinfo) 2044 vmmap_flags = KERN_VMMAP_PACK_KINFO; 2045 else 2046 vmmap_flags = 0; 2047 2048 p = (struct proc *)arg; 2049 structsize = sizeof(struct kinfo_vmentry); 2050 if (sb == NULL) { 2051 size = 0; 2052 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN); 2053 sbuf_set_drain(sb, sbuf_drain_count, &size); 2054 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2055 PROC_LOCK(p); 2056 kern_proc_vmmap_out(p, sb, -1, vmmap_flags); 2057 sbuf_finish(sb); 2058 sbuf_delete(sb); 2059 *sizep = size; 2060 } else { 2061 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2062 PROC_LOCK(p); 2063 kern_proc_vmmap_out(p, sb, *sizep - sizeof(structsize), 2064 vmmap_flags); 2065 } 2066} 2067 2068static void 2069note_procstat_groups(void *arg, struct sbuf *sb, size_t *sizep) 2070{ 2071 struct proc *p; 2072 size_t size; 2073 int structsize; 2074 2075 p = (struct proc *)arg; 2076 size = sizeof(structsize) + p->p_ucred->cr_ngroups * sizeof(gid_t); 2077 if (sb != NULL) { 2078 KASSERT(*sizep == size, ("invalid size")); 2079 structsize = sizeof(gid_t); 2080 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2081 sbuf_bcat(sb, p->p_ucred->cr_groups, p->p_ucred->cr_ngroups * 2082 sizeof(gid_t)); 2083 } 2084 *sizep = size; 2085} 2086 2087static void 2088note_procstat_umask(void *arg, struct sbuf *sb, size_t *sizep) 2089{ 2090 struct proc *p; 2091 size_t size; 2092 int structsize; 2093 2094 p = (struct proc *)arg; 2095 size = sizeof(structsize) + sizeof(p->p_fd->fd_cmask); 2096 if (sb != NULL) { 2097 KASSERT(*sizep == size, ("invalid size")); 2098 structsize = sizeof(p->p_fd->fd_cmask); 2099 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2100 sbuf_bcat(sb, &p->p_fd->fd_cmask, sizeof(p->p_fd->fd_cmask)); 2101 } 2102 *sizep = size; 2103} 2104 2105static void 2106note_procstat_rlimit(void *arg, struct sbuf *sb, size_t *sizep) 2107{ 2108 struct proc *p; 2109 struct rlimit rlim[RLIM_NLIMITS]; 2110 size_t size; 2111 int structsize, i; 2112 2113 p = (struct proc *)arg; 2114 size = sizeof(structsize) + sizeof(rlim); 2115 if (sb != NULL) { 2116 KASSERT(*sizep == size, ("invalid size")); 2117 structsize = sizeof(rlim); 2118 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2119 PROC_LOCK(p); 2120 for (i = 0; i < RLIM_NLIMITS; i++) 2121 lim_rlimit(p, i, &rlim[i]); 2122 PROC_UNLOCK(p); 2123 sbuf_bcat(sb, rlim, sizeof(rlim)); 2124 } 2125 *sizep = size; 2126} 2127 2128static void 2129note_procstat_osrel(void *arg, struct sbuf *sb, size_t *sizep) 2130{ 2131 struct proc *p; 2132 size_t size; 2133 int structsize; 2134 2135 p = (struct proc *)arg; 2136 size = sizeof(structsize) + sizeof(p->p_osrel); 2137 if (sb != NULL) { 2138 KASSERT(*sizep == size, ("invalid size")); 2139 structsize = sizeof(p->p_osrel); 2140 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2141 sbuf_bcat(sb, &p->p_osrel, sizeof(p->p_osrel)); 2142 } 2143 *sizep = size; 2144} 2145 2146static void 2147__elfN(note_procstat_psstrings)(void *arg, struct sbuf *sb, size_t *sizep) 2148{ 2149 struct proc *p; 2150 elf_ps_strings_t ps_strings; 2151 size_t size; 2152 int structsize; 2153 2154 p = (struct proc *)arg; 2155 size = sizeof(structsize) + sizeof(ps_strings); 2156 if (sb != NULL) { 2157 KASSERT(*sizep == size, ("invalid size")); 2158 structsize = sizeof(ps_strings); 2159#if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 2160 ps_strings = PTROUT(p->p_sysent->sv_psstrings); 2161#else 2162 ps_strings = p->p_sysent->sv_psstrings; 2163#endif 2164 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2165 sbuf_bcat(sb, &ps_strings, sizeof(ps_strings)); 2166 } 2167 *sizep = size; 2168} 2169 2170static void 2171__elfN(note_procstat_auxv)(void *arg, struct sbuf *sb, size_t *sizep) 2172{ 2173 struct proc *p; 2174 size_t size; 2175 int structsize; 2176 2177 p = (struct proc *)arg; 2178 if (sb == NULL) { 2179 size = 0; 2180 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN); 2181 sbuf_set_drain(sb, sbuf_drain_count, &size); 2182 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2183 PHOLD(p); 2184 proc_getauxv(curthread, p, sb); 2185 PRELE(p); 2186 sbuf_finish(sb); 2187 sbuf_delete(sb); 2188 *sizep = size; 2189 } else { 2190 structsize = sizeof(Elf_Auxinfo); 2191 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2192 PHOLD(p); 2193 proc_getauxv(curthread, p, sb); 2194 PRELE(p); 2195 } 2196} 2197 2198static boolean_t 2199__elfN(parse_notes)(struct image_params *imgp, Elf_Brandnote *checknote, 2200 int32_t *osrel, const Elf_Phdr *pnote) 2201{ 2202 const Elf_Note *note, *note0, *note_end; 2203 const char *note_name; 2204 char *buf; 2205 int i, error; 2206 boolean_t res; 2207 2208 /* We need some limit, might as well use PAGE_SIZE. */ 2209 if (pnote == NULL || pnote->p_filesz > PAGE_SIZE) 2210 return (FALSE); 2211 ASSERT_VOP_LOCKED(imgp->vp, "parse_notes"); 2212 if (pnote->p_offset > PAGE_SIZE || 2213 pnote->p_filesz > PAGE_SIZE - pnote->p_offset) { 2214 VOP_UNLOCK(imgp->vp, 0); 2215 buf = malloc(pnote->p_filesz, M_TEMP, M_WAITOK); 2216 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY); 2217 error = vn_rdwr(UIO_READ, imgp->vp, buf, pnote->p_filesz, 2218 pnote->p_offset, UIO_SYSSPACE, IO_NODELOCKED, 2219 curthread->td_ucred, NOCRED, NULL, curthread); 2220 if (error != 0) { 2221 uprintf("i/o error PT_NOTE\n"); 2222 res = FALSE; 2223 goto ret; 2224 } 2225 note = note0 = (const Elf_Note *)buf; 2226 note_end = (const Elf_Note *)(buf + pnote->p_filesz); 2227 } else { 2228 note = note0 = (const Elf_Note *)(imgp->image_header + 2229 pnote->p_offset); 2230 note_end = (const Elf_Note *)(imgp->image_header + 2231 pnote->p_offset + pnote->p_filesz); 2232 buf = NULL; 2233 } 2234 for (i = 0; i < 100 && note >= note0 && note < note_end; i++) { 2235 if (!aligned(note, Elf32_Addr) || (const char *)note_end - 2236 (const char *)note < sizeof(Elf_Note)) { 2237 res = FALSE; 2238 goto ret; 2239 } 2240 if (note->n_namesz != checknote->hdr.n_namesz || 2241 note->n_descsz != checknote->hdr.n_descsz || 2242 note->n_type != checknote->hdr.n_type) 2243 goto nextnote; 2244 note_name = (const char *)(note + 1); 2245 if (note_name + checknote->hdr.n_namesz >= 2246 (const char *)note_end || strncmp(checknote->vendor, 2247 note_name, checknote->hdr.n_namesz) != 0) 2248 goto nextnote; 2249 2250 /* 2251 * Fetch the osreldate for binary 2252 * from the ELF OSABI-note if necessary. 2253 */ 2254 if ((checknote->flags & BN_TRANSLATE_OSREL) != 0 && 2255 checknote->trans_osrel != NULL) { 2256 res = checknote->trans_osrel(note, osrel); 2257 goto ret; 2258 } 2259 res = TRUE; 2260 goto ret; 2261nextnote: 2262 note = (const Elf_Note *)((const char *)(note + 1) + 2263 roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE) + 2264 roundup2(note->n_descsz, ELF_NOTE_ROUNDSIZE)); 2265 } 2266 res = FALSE; 2267ret: 2268 free(buf, M_TEMP); 2269 return (res); 2270} 2271 2272/* 2273 * Try to find the appropriate ABI-note section for checknote, 2274 * fetch the osreldate for binary from the ELF OSABI-note. Only the 2275 * first page of the image is searched, the same as for headers. 2276 */ 2277static boolean_t 2278__elfN(check_note)(struct image_params *imgp, Elf_Brandnote *checknote, 2279 int32_t *osrel) 2280{ 2281 const Elf_Phdr *phdr; 2282 const Elf_Ehdr *hdr; 2283 int i; 2284 2285 hdr = (const Elf_Ehdr *)imgp->image_header; 2286 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 2287 2288 for (i = 0; i < hdr->e_phnum; i++) { 2289 if (phdr[i].p_type == PT_NOTE && 2290 __elfN(parse_notes)(imgp, checknote, osrel, &phdr[i])) 2291 return (TRUE); 2292 } 2293 return (FALSE); 2294 2295} 2296 2297/* 2298 * Tell kern_execve.c about it, with a little help from the linker. 2299 */ 2300static struct execsw __elfN(execsw) = { 2301 __CONCAT(exec_, __elfN(imgact)), 2302 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) 2303}; 2304EXEC_SET(__CONCAT(elf, __ELF_WORD_SIZE), __elfN(execsw)); 2305 2306#ifdef COMPRESS_USER_CORES 2307/* 2308 * Compress and write out a core segment for a user process. 2309 * 2310 * 'inbuf' is the starting address of a VM segment in the process' address 2311 * space that is to be compressed and written out to the core file. 'dest_buf' 2312 * is a buffer in the kernel's address space. The segment is copied from 2313 * 'inbuf' to 'dest_buf' first before being processed by the compression 2314 * routine gzwrite(). This copying is necessary because the content of the VM 2315 * segment may change between the compression pass and the crc-computation pass 2316 * in gzwrite(). This is because realtime threads may preempt the UNIX kernel. 2317 * 2318 * If inbuf is NULL it is assumed that data is already copied to 'dest_buf'. 2319 */ 2320static int 2321compress_core (gzFile file, char *inbuf, char *dest_buf, unsigned int len, 2322 struct thread *td) 2323{ 2324 int len_compressed; 2325 int error = 0; 2326 unsigned int chunk_len; 2327 2328 while (len) { 2329 if (inbuf != NULL) { 2330 chunk_len = (len > CORE_BUF_SIZE) ? CORE_BUF_SIZE : len; 2331 2332 /* 2333 * We can get EFAULT error here. In that case zero out 2334 * the current chunk of the segment. 2335 */ 2336 error = copyin(inbuf, dest_buf, chunk_len); 2337 if (error != 0) { 2338 bzero(dest_buf, chunk_len); 2339 error = 0; 2340 } 2341 inbuf += chunk_len; 2342 } else { 2343 chunk_len = len; 2344 } 2345 len_compressed = gzwrite(file, dest_buf, chunk_len); 2346 2347 EVENTHANDLER_INVOKE(app_coredump_progress, td, len_compressed); 2348 2349 if ((unsigned int)len_compressed != chunk_len) { 2350 log(LOG_WARNING, 2351 "compress_core: length mismatch (0x%x returned, " 2352 "0x%x expected)\n", len_compressed, chunk_len); 2353 EVENTHANDLER_INVOKE(app_coredump_error, td, 2354 "compress_core: length mismatch %x -> %x", 2355 chunk_len, len_compressed); 2356 error = EFAULT; 2357 break; 2358 } 2359 len -= chunk_len; 2360 maybe_yield(); 2361 } 2362 2363 return (error); 2364} 2365#endif /* COMPRESS_USER_CORES */ 2366 2367static vm_prot_t 2368__elfN(trans_prot)(Elf_Word flags) 2369{ 2370 vm_prot_t prot; 2371 2372 prot = 0; 2373 if (flags & PF_X) 2374 prot |= VM_PROT_EXECUTE; 2375 if (flags & PF_W) 2376 prot |= VM_PROT_WRITE; 2377 if (flags & PF_R) 2378 prot |= VM_PROT_READ; 2379#if __ELF_WORD_SIZE == 32 2380#if defined(__amd64__) || defined(__ia64__) 2381 if (i386_read_exec && (flags & PF_R)) 2382 prot |= VM_PROT_EXECUTE; 2383#endif 2384#endif 2385 return (prot); 2386} 2387 2388static Elf_Word 2389__elfN(untrans_prot)(vm_prot_t prot) 2390{ 2391 Elf_Word flags; 2392 2393 flags = 0; 2394 if (prot & VM_PROT_EXECUTE) 2395 flags |= PF_X; 2396 if (prot & VM_PROT_READ) 2397 flags |= PF_R; 2398 if (prot & VM_PROT_WRITE) 2399 flags |= PF_W; 2400 return (flags); 2401} 2402