imgact_elf.c revision 308009
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 308009 2016-10-28 03:54:19Z 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) { 403 return (KERN_FAILURE); 404 } 405 } 406 407 return (KERN_SUCCESS); 408} 409 410static int 411__elfN(map_insert)(vm_map_t map, vm_object_t object, vm_ooffset_t offset, 412 vm_offset_t start, vm_offset_t end, vm_prot_t prot, int cow) 413{ 414 struct sf_buf *sf; 415 vm_offset_t off; 416 vm_size_t sz; 417 int error, rv; 418 419 if (start != trunc_page(start)) { 420 rv = __elfN(map_partial)(map, object, offset, start, 421 round_page(start), prot); 422 if (rv) 423 return (rv); 424 offset += round_page(start) - start; 425 start = round_page(start); 426 } 427 if (end != round_page(end)) { 428 rv = __elfN(map_partial)(map, object, offset + 429 trunc_page(end) - start, trunc_page(end), end, prot); 430 if (rv) 431 return (rv); 432 end = trunc_page(end); 433 } 434 if (end > start) { 435 if (offset & PAGE_MASK) { 436 /* 437 * The mapping is not page aligned. This means we have 438 * to copy the data. Sigh. 439 */ 440 rv = vm_map_find(map, NULL, 0, &start, end - start, 0, 441 VMFS_NO_SPACE, prot | VM_PROT_WRITE, VM_PROT_ALL, 442 0); 443 if (rv != KERN_SUCCESS) 444 return (rv); 445 if (object == NULL) 446 return (KERN_SUCCESS); 447 for (; start < end; start += sz) { 448 sf = vm_imgact_map_page(object, offset); 449 if (sf == NULL) 450 return (KERN_FAILURE); 451 off = offset - trunc_page(offset); 452 sz = end - start; 453 if (sz > PAGE_SIZE - off) 454 sz = PAGE_SIZE - off; 455 error = copyout((caddr_t)sf_buf_kva(sf) + off, 456 (caddr_t)start, sz); 457 vm_imgact_unmap_page(sf); 458 if (error != 0) 459 return (KERN_FAILURE); 460 offset += sz; 461 } 462 rv = KERN_SUCCESS; 463 } else { 464 vm_object_reference(object); 465 vm_map_lock(map); 466 rv = vm_map_insert(map, object, offset, start, end, 467 prot, VM_PROT_ALL, cow); 468 vm_map_unlock(map); 469 if (rv != KERN_SUCCESS) 470 vm_object_deallocate(object); 471 } 472 return (rv); 473 } else { 474 return (KERN_SUCCESS); 475 } 476} 477 478static int 479__elfN(load_section)(struct image_params *imgp, vm_offset_t offset, 480 caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot, 481 size_t pagesize) 482{ 483 struct sf_buf *sf; 484 size_t map_len; 485 vm_map_t map; 486 vm_object_t object; 487 vm_offset_t map_addr; 488 int error, rv, cow; 489 size_t copy_len; 490 vm_offset_t file_addr; 491 492 /* 493 * It's necessary to fail if the filsz + offset taken from the 494 * header is greater than the actual file pager object's size. 495 * If we were to allow this, then the vm_map_find() below would 496 * walk right off the end of the file object and into the ether. 497 * 498 * While I'm here, might as well check for something else that 499 * is invalid: filsz cannot be greater than memsz. 500 */ 501 if ((off_t)filsz + offset > imgp->attr->va_size || filsz > memsz) { 502 uprintf("elf_load_section: truncated ELF file\n"); 503 return (ENOEXEC); 504 } 505 506 object = imgp->object; 507 map = &imgp->proc->p_vmspace->vm_map; 508 map_addr = trunc_page_ps((vm_offset_t)vmaddr, pagesize); 509 file_addr = trunc_page_ps(offset, pagesize); 510 511 /* 512 * We have two choices. We can either clear the data in the last page 513 * of an oversized mapping, or we can start the anon mapping a page 514 * early and copy the initialized data into that first page. We 515 * choose the second.. 516 */ 517 if (memsz > filsz) 518 map_len = trunc_page_ps(offset + filsz, pagesize) - file_addr; 519 else 520 map_len = round_page_ps(offset + filsz, pagesize) - file_addr; 521 522 if (map_len != 0) { 523 /* cow flags: don't dump readonly sections in core */ 524 cow = MAP_COPY_ON_WRITE | MAP_PREFAULT | 525 (prot & VM_PROT_WRITE ? 0 : MAP_DISABLE_COREDUMP); 526 527 rv = __elfN(map_insert)(map, 528 object, 529 file_addr, /* file offset */ 530 map_addr, /* virtual start */ 531 map_addr + map_len,/* virtual end */ 532 prot, 533 cow); 534 if (rv != KERN_SUCCESS) 535 return (EINVAL); 536 537 /* we can stop now if we've covered it all */ 538 if (memsz == filsz) { 539 return (0); 540 } 541 } 542 543 544 /* 545 * We have to get the remaining bit of the file into the first part 546 * of the oversized map segment. This is normally because the .data 547 * segment in the file is extended to provide bss. It's a neat idea 548 * to try and save a page, but it's a pain in the behind to implement. 549 */ 550 copy_len = (offset + filsz) - trunc_page_ps(offset + filsz, pagesize); 551 map_addr = trunc_page_ps((vm_offset_t)vmaddr + filsz, pagesize); 552 map_len = round_page_ps((vm_offset_t)vmaddr + memsz, pagesize) - 553 map_addr; 554 555 /* This had damn well better be true! */ 556 if (map_len != 0) { 557 rv = __elfN(map_insert)(map, NULL, 0, map_addr, map_addr + 558 map_len, VM_PROT_ALL, 0); 559 if (rv != KERN_SUCCESS) { 560 return (EINVAL); 561 } 562 } 563 564 if (copy_len != 0) { 565 vm_offset_t off; 566 567 sf = vm_imgact_map_page(object, offset + filsz); 568 if (sf == NULL) 569 return (EIO); 570 571 /* send the page fragment to user space */ 572 off = trunc_page_ps(offset + filsz, pagesize) - 573 trunc_page(offset + filsz); 574 error = copyout((caddr_t)sf_buf_kva(sf) + off, 575 (caddr_t)map_addr, copy_len); 576 vm_imgact_unmap_page(sf); 577 if (error) { 578 return (error); 579 } 580 } 581 582 /* 583 * set it to the specified protection. 584 * XXX had better undo the damage from pasting over the cracks here! 585 */ 586 vm_map_protect(map, trunc_page(map_addr), round_page(map_addr + 587 map_len), prot, FALSE); 588 589 return (0); 590} 591 592/* 593 * Load the file "file" into memory. It may be either a shared object 594 * or an executable. 595 * 596 * The "addr" reference parameter is in/out. On entry, it specifies 597 * the address where a shared object should be loaded. If the file is 598 * an executable, this value is ignored. On exit, "addr" specifies 599 * where the file was actually loaded. 600 * 601 * The "entry" reference parameter is out only. On exit, it specifies 602 * the entry point for the loaded file. 603 */ 604static int 605__elfN(load_file)(struct proc *p, const char *file, u_long *addr, 606 u_long *entry, size_t pagesize) 607{ 608 struct { 609 struct nameidata nd; 610 struct vattr attr; 611 struct image_params image_params; 612 } *tempdata; 613 const Elf_Ehdr *hdr = NULL; 614 const Elf_Phdr *phdr = NULL; 615 struct nameidata *nd; 616 struct vattr *attr; 617 struct image_params *imgp; 618 vm_prot_t prot; 619 u_long rbase; 620 u_long base_addr = 0; 621 int error, i, numsegs; 622 623#ifdef CAPABILITY_MODE 624 /* 625 * XXXJA: This check can go away once we are sufficiently confident 626 * that the checks in namei() are correct. 627 */ 628 if (IN_CAPABILITY_MODE(curthread)) 629 return (ECAPMODE); 630#endif 631 632 tempdata = malloc(sizeof(*tempdata), M_TEMP, M_WAITOK); 633 nd = &tempdata->nd; 634 attr = &tempdata->attr; 635 imgp = &tempdata->image_params; 636 637 /* 638 * Initialize part of the common data 639 */ 640 imgp->proc = p; 641 imgp->attr = attr; 642 imgp->firstpage = NULL; 643 imgp->image_header = NULL; 644 imgp->object = NULL; 645 imgp->execlabel = NULL; 646 647 NDINIT(nd, LOOKUP, LOCKLEAF | FOLLOW, UIO_SYSSPACE, file, curthread); 648 if ((error = namei(nd)) != 0) { 649 nd->ni_vp = NULL; 650 goto fail; 651 } 652 NDFREE(nd, NDF_ONLY_PNBUF); 653 imgp->vp = nd->ni_vp; 654 655 /* 656 * Check permissions, modes, uid, etc on the file, and "open" it. 657 */ 658 error = exec_check_permissions(imgp); 659 if (error) 660 goto fail; 661 662 error = exec_map_first_page(imgp); 663 if (error) 664 goto fail; 665 666 /* 667 * Also make certain that the interpreter stays the same, so set 668 * its VV_TEXT flag, too. 669 */ 670 VOP_SET_TEXT(nd->ni_vp); 671 672 imgp->object = nd->ni_vp->v_object; 673 674 hdr = (const Elf_Ehdr *)imgp->image_header; 675 if ((error = __elfN(check_header)(hdr)) != 0) 676 goto fail; 677 if (hdr->e_type == ET_DYN) 678 rbase = *addr; 679 else if (hdr->e_type == ET_EXEC) 680 rbase = 0; 681 else { 682 error = ENOEXEC; 683 goto fail; 684 } 685 686 /* Only support headers that fit within first page for now */ 687 if ((hdr->e_phoff > PAGE_SIZE) || 688 (u_int)hdr->e_phentsize * hdr->e_phnum > PAGE_SIZE - hdr->e_phoff) { 689 error = ENOEXEC; 690 goto fail; 691 } 692 693 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 694 if (!aligned(phdr, Elf_Addr)) { 695 error = ENOEXEC; 696 goto fail; 697 } 698 699 for (i = 0, numsegs = 0; i < hdr->e_phnum; i++) { 700 if (phdr[i].p_type == PT_LOAD && phdr[i].p_memsz != 0) { 701 /* Loadable segment */ 702 prot = __elfN(trans_prot)(phdr[i].p_flags); 703 error = __elfN(load_section)(imgp, phdr[i].p_offset, 704 (caddr_t)(uintptr_t)phdr[i].p_vaddr + rbase, 705 phdr[i].p_memsz, phdr[i].p_filesz, prot, pagesize); 706 if (error != 0) 707 goto fail; 708 /* 709 * Establish the base address if this is the 710 * first segment. 711 */ 712 if (numsegs == 0) 713 base_addr = trunc_page(phdr[i].p_vaddr + 714 rbase); 715 numsegs++; 716 } 717 } 718 *addr = base_addr; 719 *entry = (unsigned long)hdr->e_entry + rbase; 720 721fail: 722 if (imgp->firstpage) 723 exec_unmap_first_page(imgp); 724 725 if (nd->ni_vp) 726 vput(nd->ni_vp); 727 728 free(tempdata, M_TEMP); 729 730 return (error); 731} 732 733static int 734__CONCAT(exec_, __elfN(imgact))(struct image_params *imgp) 735{ 736 struct thread *td; 737 const Elf_Ehdr *hdr; 738 const Elf_Phdr *phdr; 739 Elf_Auxargs *elf_auxargs; 740 struct vmspace *vmspace; 741 const char *err_str, *newinterp; 742 char *interp, *interp_buf, *path; 743 Elf_Brandinfo *brand_info; 744 struct sysentvec *sv; 745 vm_prot_t prot; 746 u_long text_size, data_size, total_size, text_addr, data_addr; 747 u_long seg_size, seg_addr, addr, baddr, et_dyn_addr, entry, proghdr; 748 int32_t osrel; 749 int error, i, n, interp_name_len, have_interp; 750 751 hdr = (const Elf_Ehdr *)imgp->image_header; 752 753 /* 754 * Do we have a valid ELF header ? 755 * 756 * Only allow ET_EXEC & ET_DYN here, reject ET_DYN later 757 * if particular brand doesn't support it. 758 */ 759 if (__elfN(check_header)(hdr) != 0 || 760 (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN)) 761 return (-1); 762 763 /* 764 * From here on down, we return an errno, not -1, as we've 765 * detected an ELF file. 766 */ 767 768 if ((hdr->e_phoff > PAGE_SIZE) || 769 (u_int)hdr->e_phentsize * hdr->e_phnum > PAGE_SIZE - hdr->e_phoff) { 770 /* Only support headers in first page for now */ 771 uprintf("Program headers not in the first page\n"); 772 return (ENOEXEC); 773 } 774 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 775 if (!aligned(phdr, Elf_Addr)) { 776 uprintf("Unaligned program headers\n"); 777 return (ENOEXEC); 778 } 779 780 n = error = 0; 781 baddr = 0; 782 osrel = 0; 783 text_size = data_size = total_size = text_addr = data_addr = 0; 784 entry = proghdr = 0; 785 interp_name_len = 0; 786 err_str = newinterp = NULL; 787 interp = interp_buf = NULL; 788 td = curthread; 789 790 for (i = 0; i < hdr->e_phnum; i++) { 791 switch (phdr[i].p_type) { 792 case PT_LOAD: 793 if (n == 0) 794 baddr = phdr[i].p_vaddr; 795 n++; 796 break; 797 case PT_INTERP: 798 /* Path to interpreter */ 799 if (phdr[i].p_filesz > MAXPATHLEN) { 800 uprintf("Invalid PT_INTERP\n"); 801 error = ENOEXEC; 802 goto ret; 803 } 804 if (interp != NULL) { 805 uprintf("Multiple PT_INTERP headers\n"); 806 error = ENOEXEC; 807 goto ret; 808 } 809 interp_name_len = phdr[i].p_filesz; 810 if (phdr[i].p_offset > PAGE_SIZE || 811 interp_name_len > PAGE_SIZE - phdr[i].p_offset) { 812 VOP_UNLOCK(imgp->vp, 0); 813 interp_buf = malloc(interp_name_len + 1, M_TEMP, 814 M_WAITOK); 815 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY); 816 error = vn_rdwr(UIO_READ, imgp->vp, interp_buf, 817 interp_name_len, phdr[i].p_offset, 818 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, 819 NOCRED, NULL, td); 820 if (error != 0) { 821 uprintf("i/o error PT_INTERP\n"); 822 goto ret; 823 } 824 interp_buf[interp_name_len] = '\0'; 825 interp = interp_buf; 826 } else { 827 interp = __DECONST(char *, imgp->image_header) + 828 phdr[i].p_offset; 829 } 830 break; 831 case PT_GNU_STACK: 832 if (__elfN(nxstack)) 833 imgp->stack_prot = 834 __elfN(trans_prot)(phdr[i].p_flags); 835 imgp->stack_sz = phdr[i].p_memsz; 836 break; 837 } 838 } 839 840 brand_info = __elfN(get_brandinfo)(imgp, interp, interp_name_len, 841 &osrel); 842 if (brand_info == NULL) { 843 uprintf("ELF binary type \"%u\" not known.\n", 844 hdr->e_ident[EI_OSABI]); 845 error = ENOEXEC; 846 goto ret; 847 } 848 if (hdr->e_type == ET_DYN) { 849 if ((brand_info->flags & BI_CAN_EXEC_DYN) == 0) { 850 uprintf("Cannot execute shared object\n"); 851 error = ENOEXEC; 852 goto ret; 853 } 854 /* 855 * Honour the base load address from the dso if it is 856 * non-zero for some reason. 857 */ 858 if (baddr == 0) 859 et_dyn_addr = ET_DYN_LOAD_ADDR; 860 else 861 et_dyn_addr = 0; 862 } else 863 et_dyn_addr = 0; 864 sv = brand_info->sysvec; 865 if (interp != NULL && brand_info->interp_newpath != NULL) 866 newinterp = brand_info->interp_newpath; 867 868 /* 869 * Avoid a possible deadlock if the current address space is destroyed 870 * and that address space maps the locked vnode. In the common case, 871 * the locked vnode's v_usecount is decremented but remains greater 872 * than zero. Consequently, the vnode lock is not needed by vrele(). 873 * However, in cases where the vnode lock is external, such as nullfs, 874 * v_usecount may become zero. 875 * 876 * The VV_TEXT flag prevents modifications to the executable while 877 * the vnode is unlocked. 878 */ 879 VOP_UNLOCK(imgp->vp, 0); 880 881 error = exec_new_vmspace(imgp, sv); 882 imgp->proc->p_sysent = sv; 883 884 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY); 885 if (error != 0) 886 goto ret; 887 888 for (i = 0; i < hdr->e_phnum; i++) { 889 switch (phdr[i].p_type) { 890 case PT_LOAD: /* Loadable segment */ 891 if (phdr[i].p_memsz == 0) 892 break; 893 prot = __elfN(trans_prot)(phdr[i].p_flags); 894 error = __elfN(load_section)(imgp, phdr[i].p_offset, 895 (caddr_t)(uintptr_t)phdr[i].p_vaddr + et_dyn_addr, 896 phdr[i].p_memsz, phdr[i].p_filesz, prot, 897 sv->sv_pagesize); 898 if (error != 0) 899 goto ret; 900 901 /* 902 * If this segment contains the program headers, 903 * remember their virtual address for the AT_PHDR 904 * aux entry. Static binaries don't usually include 905 * a PT_PHDR entry. 906 */ 907 if (phdr[i].p_offset == 0 && 908 hdr->e_phoff + hdr->e_phnum * hdr->e_phentsize 909 <= phdr[i].p_filesz) 910 proghdr = phdr[i].p_vaddr + hdr->e_phoff + 911 et_dyn_addr; 912 913 seg_addr = trunc_page(phdr[i].p_vaddr + et_dyn_addr); 914 seg_size = round_page(phdr[i].p_memsz + 915 phdr[i].p_vaddr + et_dyn_addr - seg_addr); 916 917 /* 918 * Make the largest executable segment the official 919 * text segment and all others data. 920 * 921 * Note that obreak() assumes that data_addr + 922 * data_size == end of data load area, and the ELF 923 * file format expects segments to be sorted by 924 * address. If multiple data segments exist, the 925 * last one will be used. 926 */ 927 928 if (phdr[i].p_flags & PF_X && text_size < seg_size) { 929 text_size = seg_size; 930 text_addr = seg_addr; 931 } else { 932 data_size = seg_size; 933 data_addr = seg_addr; 934 } 935 total_size += seg_size; 936 break; 937 case PT_PHDR: /* Program header table info */ 938 proghdr = phdr[i].p_vaddr + et_dyn_addr; 939 break; 940 default: 941 break; 942 } 943 } 944 945 if (data_addr == 0 && data_size == 0) { 946 data_addr = text_addr; 947 data_size = text_size; 948 } 949 950 entry = (u_long)hdr->e_entry + et_dyn_addr; 951 952 /* 953 * Check limits. It should be safe to check the 954 * limits after loading the segments since we do 955 * not actually fault in all the segments pages. 956 */ 957 PROC_LOCK(imgp->proc); 958 if (data_size > lim_cur(imgp->proc, RLIMIT_DATA)) 959 err_str = "Data segment size exceeds process limit"; 960 else if (text_size > maxtsiz) 961 err_str = "Text segment size exceeds system limit"; 962 else if (total_size > lim_cur(imgp->proc, RLIMIT_VMEM)) 963 err_str = "Total segment size exceeds process limit"; 964 else if (racct_set(imgp->proc, RACCT_DATA, data_size) != 0) 965 err_str = "Data segment size exceeds resource limit"; 966 else if (racct_set(imgp->proc, RACCT_VMEM, total_size) != 0) 967 err_str = "Total segment size exceeds resource limit"; 968 if (err_str != NULL) { 969 PROC_UNLOCK(imgp->proc); 970 uprintf("%s\n", err_str); 971 error = ENOMEM; 972 goto ret; 973 } 974 975 vmspace = imgp->proc->p_vmspace; 976 vmspace->vm_tsize = text_size >> PAGE_SHIFT; 977 vmspace->vm_taddr = (caddr_t)(uintptr_t)text_addr; 978 vmspace->vm_dsize = data_size >> PAGE_SHIFT; 979 vmspace->vm_daddr = (caddr_t)(uintptr_t)data_addr; 980 981 /* 982 * We load the dynamic linker where a userland call 983 * to mmap(0, ...) would put it. The rationale behind this 984 * calculation is that it leaves room for the heap to grow to 985 * its maximum allowed size. 986 */ 987 addr = round_page((vm_offset_t)vmspace->vm_daddr + lim_max(imgp->proc, 988 RLIMIT_DATA)); 989 PROC_UNLOCK(imgp->proc); 990 991 imgp->entry_addr = entry; 992 993 if (interp != NULL) { 994 have_interp = FALSE; 995 VOP_UNLOCK(imgp->vp, 0); 996 if (brand_info->emul_path != NULL && 997 brand_info->emul_path[0] != '\0') { 998 path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 999 snprintf(path, MAXPATHLEN, "%s%s", 1000 brand_info->emul_path, interp); 1001 error = __elfN(load_file)(imgp->proc, path, &addr, 1002 &imgp->entry_addr, sv->sv_pagesize); 1003 free(path, M_TEMP); 1004 if (error == 0) 1005 have_interp = TRUE; 1006 } 1007 if (!have_interp && newinterp != NULL && 1008 (brand_info->interp_path == NULL || 1009 strcmp(interp, brand_info->interp_path) == 0)) { 1010 error = __elfN(load_file)(imgp->proc, newinterp, &addr, 1011 &imgp->entry_addr, sv->sv_pagesize); 1012 if (error == 0) 1013 have_interp = TRUE; 1014 } 1015 if (!have_interp) { 1016 error = __elfN(load_file)(imgp->proc, interp, &addr, 1017 &imgp->entry_addr, sv->sv_pagesize); 1018 } 1019 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY); 1020 if (error != 0) { 1021 uprintf("ELF interpreter %s not found, error %d\n", 1022 interp, error); 1023 goto ret; 1024 } 1025 } else 1026 addr = et_dyn_addr; 1027 1028 /* 1029 * Construct auxargs table (used by the fixup routine) 1030 */ 1031 elf_auxargs = malloc(sizeof(Elf_Auxargs), M_TEMP, M_WAITOK); 1032 elf_auxargs->execfd = -1; 1033 elf_auxargs->phdr = proghdr; 1034 elf_auxargs->phent = hdr->e_phentsize; 1035 elf_auxargs->phnum = hdr->e_phnum; 1036 elf_auxargs->pagesz = PAGE_SIZE; 1037 elf_auxargs->base = addr; 1038 elf_auxargs->flags = 0; 1039 elf_auxargs->entry = entry; 1040 1041 imgp->auxargs = elf_auxargs; 1042 imgp->interpreted = 0; 1043 imgp->reloc_base = addr; 1044 imgp->proc->p_osrel = osrel; 1045 1046 ret: 1047 free(interp_buf, M_TEMP); 1048 return (error); 1049} 1050 1051#define suword __CONCAT(suword, __ELF_WORD_SIZE) 1052 1053int 1054__elfN(freebsd_fixup)(register_t **stack_base, struct image_params *imgp) 1055{ 1056 Elf_Auxargs *args = (Elf_Auxargs *)imgp->auxargs; 1057 Elf_Addr *base; 1058 Elf_Addr *pos; 1059 1060 base = (Elf_Addr *)*stack_base; 1061 pos = base + (imgp->args->argc + imgp->args->envc + 2); 1062 1063 if (args->execfd != -1) 1064 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd); 1065 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr); 1066 AUXARGS_ENTRY(pos, AT_PHENT, args->phent); 1067 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum); 1068 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz); 1069 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags); 1070 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry); 1071 AUXARGS_ENTRY(pos, AT_BASE, args->base); 1072 if (imgp->execpathp != 0) 1073 AUXARGS_ENTRY(pos, AT_EXECPATH, imgp->execpathp); 1074 AUXARGS_ENTRY(pos, AT_OSRELDATE, 1075 imgp->proc->p_ucred->cr_prison->pr_osreldate); 1076 if (imgp->canary != 0) { 1077 AUXARGS_ENTRY(pos, AT_CANARY, imgp->canary); 1078 AUXARGS_ENTRY(pos, AT_CANARYLEN, imgp->canarylen); 1079 } 1080 AUXARGS_ENTRY(pos, AT_NCPUS, mp_ncpus); 1081 if (imgp->pagesizes != 0) { 1082 AUXARGS_ENTRY(pos, AT_PAGESIZES, imgp->pagesizes); 1083 AUXARGS_ENTRY(pos, AT_PAGESIZESLEN, imgp->pagesizeslen); 1084 } 1085 if (imgp->sysent->sv_timekeep_base != 0) { 1086 AUXARGS_ENTRY(pos, AT_TIMEKEEP, 1087 imgp->sysent->sv_timekeep_base); 1088 } 1089 AUXARGS_ENTRY(pos, AT_STACKPROT, imgp->sysent->sv_shared_page_obj 1090 != NULL && imgp->stack_prot != 0 ? imgp->stack_prot : 1091 imgp->sysent->sv_stackprot); 1092 AUXARGS_ENTRY(pos, AT_NULL, 0); 1093 1094 free(imgp->auxargs, M_TEMP); 1095 imgp->auxargs = NULL; 1096 1097 base--; 1098 suword(base, (long)imgp->args->argc); 1099 *stack_base = (register_t *)base; 1100 return (0); 1101} 1102 1103/* 1104 * Code for generating ELF core dumps. 1105 */ 1106 1107typedef void (*segment_callback)(vm_map_entry_t, void *); 1108 1109/* Closure for cb_put_phdr(). */ 1110struct phdr_closure { 1111 Elf_Phdr *phdr; /* Program header to fill in */ 1112 Elf_Off offset; /* Offset of segment in core file */ 1113}; 1114 1115/* Closure for cb_size_segment(). */ 1116struct sseg_closure { 1117 int count; /* Count of writable segments. */ 1118 size_t size; /* Total size of all writable segments. */ 1119}; 1120 1121typedef void (*outfunc_t)(void *, struct sbuf *, size_t *); 1122 1123struct note_info { 1124 int type; /* Note type. */ 1125 outfunc_t outfunc; /* Output function. */ 1126 void *outarg; /* Argument for the output function. */ 1127 size_t outsize; /* Output size. */ 1128 TAILQ_ENTRY(note_info) link; /* Link to the next note info. */ 1129}; 1130 1131TAILQ_HEAD(note_info_list, note_info); 1132 1133static void cb_put_phdr(vm_map_entry_t, void *); 1134static void cb_size_segment(vm_map_entry_t, void *); 1135static void each_writable_segment(struct thread *, segment_callback, void *); 1136static int __elfN(corehdr)(struct thread *, struct vnode *, struct ucred *, 1137 int, void *, size_t, struct note_info_list *, size_t, gzFile); 1138static void __elfN(prepare_notes)(struct thread *, struct note_info_list *, 1139 size_t *); 1140static void __elfN(puthdr)(struct thread *, void *, size_t, int, size_t); 1141static void __elfN(putnote)(struct note_info *, struct sbuf *); 1142static size_t register_note(struct note_info_list *, int, outfunc_t, void *); 1143static int sbuf_drain_core_output(void *, const char *, int); 1144static int sbuf_drain_count(void *arg, const char *data, int len); 1145 1146static void __elfN(note_fpregset)(void *, struct sbuf *, size_t *); 1147static void __elfN(note_prpsinfo)(void *, struct sbuf *, size_t *); 1148static void __elfN(note_prstatus)(void *, struct sbuf *, size_t *); 1149static void __elfN(note_threadmd)(void *, struct sbuf *, size_t *); 1150static void __elfN(note_thrmisc)(void *, struct sbuf *, size_t *); 1151static void __elfN(note_procstat_auxv)(void *, struct sbuf *, size_t *); 1152static void __elfN(note_procstat_proc)(void *, struct sbuf *, size_t *); 1153static void __elfN(note_procstat_psstrings)(void *, struct sbuf *, size_t *); 1154static void note_procstat_files(void *, struct sbuf *, size_t *); 1155static void note_procstat_groups(void *, struct sbuf *, size_t *); 1156static void note_procstat_osrel(void *, struct sbuf *, size_t *); 1157static void note_procstat_rlimit(void *, struct sbuf *, size_t *); 1158static void note_procstat_umask(void *, struct sbuf *, size_t *); 1159static void note_procstat_vmmap(void *, struct sbuf *, size_t *); 1160 1161#ifdef COMPRESS_USER_CORES 1162extern int compress_user_cores; 1163extern int compress_user_cores_gzlevel; 1164#endif 1165 1166static int 1167core_output(struct vnode *vp, void *base, size_t len, off_t offset, 1168 struct ucred *active_cred, struct ucred *file_cred, 1169 struct thread *td, char *core_buf, gzFile gzfile) { 1170 1171 int error; 1172 if (gzfile) { 1173#ifdef COMPRESS_USER_CORES 1174 error = compress_core(gzfile, base, core_buf, len, td); 1175#else 1176 panic("shouldn't be here"); 1177#endif 1178 } else { 1179 error = vn_rdwr_inchunks(UIO_WRITE, vp, base, len, offset, 1180 UIO_USERSPACE, IO_UNIT | IO_DIRECT, active_cred, file_cred, 1181 NULL, td); 1182 } 1183 return (error); 1184} 1185 1186/* Coredump output parameters for sbuf drain routine. */ 1187struct sbuf_drain_core_params { 1188 off_t offset; 1189 struct ucred *active_cred; 1190 struct ucred *file_cred; 1191 struct thread *td; 1192 struct vnode *vp; 1193#ifdef COMPRESS_USER_CORES 1194 gzFile gzfile; 1195#endif 1196}; 1197 1198/* 1199 * Drain into a core file. 1200 */ 1201static int 1202sbuf_drain_core_output(void *arg, const char *data, int len) 1203{ 1204 struct sbuf_drain_core_params *p; 1205 int error, locked; 1206 1207 p = (struct sbuf_drain_core_params *)arg; 1208 1209 /* 1210 * Some kern_proc out routines that print to this sbuf may 1211 * call us with the process lock held. Draining with the 1212 * non-sleepable lock held is unsafe. The lock is needed for 1213 * those routines when dumping a live process. In our case we 1214 * can safely release the lock before draining and acquire 1215 * again after. 1216 */ 1217 locked = PROC_LOCKED(p->td->td_proc); 1218 if (locked) 1219 PROC_UNLOCK(p->td->td_proc); 1220#ifdef COMPRESS_USER_CORES 1221 if (p->gzfile != Z_NULL) 1222 error = compress_core(p->gzfile, NULL, __DECONST(char *, data), 1223 len, p->td); 1224 else 1225#endif 1226 error = vn_rdwr_inchunks(UIO_WRITE, p->vp, 1227 __DECONST(void *, data), len, p->offset, UIO_SYSSPACE, 1228 IO_UNIT | IO_DIRECT, p->active_cred, p->file_cred, NULL, 1229 p->td); 1230 if (locked) 1231 PROC_LOCK(p->td->td_proc); 1232 if (error != 0) 1233 return (-error); 1234 p->offset += len; 1235 return (len); 1236} 1237 1238/* 1239 * Drain into a counter. 1240 */ 1241static int 1242sbuf_drain_count(void *arg, const char *data __unused, int len) 1243{ 1244 size_t *sizep; 1245 1246 sizep = (size_t *)arg; 1247 *sizep += len; 1248 return (len); 1249} 1250 1251int 1252__elfN(coredump)(struct thread *td, struct vnode *vp, off_t limit, int flags) 1253{ 1254 struct ucred *cred = td->td_ucred; 1255 int error = 0; 1256 struct sseg_closure seginfo; 1257 struct note_info_list notelst; 1258 struct note_info *ninfo; 1259 void *hdr; 1260 size_t hdrsize, notesz, coresize; 1261 1262 gzFile gzfile = Z_NULL; 1263 char *core_buf = NULL; 1264#ifdef COMPRESS_USER_CORES 1265 char gzopen_flags[8]; 1266 char *p; 1267 int doing_compress = flags & IMGACT_CORE_COMPRESS; 1268#endif 1269 1270 hdr = NULL; 1271 TAILQ_INIT(¬elst); 1272 1273#ifdef COMPRESS_USER_CORES 1274 if (doing_compress) { 1275 p = gzopen_flags; 1276 *p++ = 'w'; 1277 if (compress_user_cores_gzlevel >= 0 && 1278 compress_user_cores_gzlevel <= 9) 1279 *p++ = '0' + compress_user_cores_gzlevel; 1280 *p = 0; 1281 gzfile = gz_open("", gzopen_flags, vp); 1282 if (gzfile == Z_NULL) { 1283 error = EFAULT; 1284 goto done; 1285 } 1286 core_buf = malloc(CORE_BUF_SIZE, M_TEMP, M_WAITOK | M_ZERO); 1287 if (!core_buf) { 1288 error = ENOMEM; 1289 goto done; 1290 } 1291 } 1292#endif 1293 1294 /* Size the program segments. */ 1295 seginfo.count = 0; 1296 seginfo.size = 0; 1297 each_writable_segment(td, cb_size_segment, &seginfo); 1298 1299 /* 1300 * Collect info about the core file header area. 1301 */ 1302 hdrsize = sizeof(Elf_Ehdr) + sizeof(Elf_Phdr) * (1 + seginfo.count); 1303 __elfN(prepare_notes)(td, ¬elst, ¬esz); 1304 coresize = round_page(hdrsize + notesz) + seginfo.size; 1305 1306#ifdef RACCT 1307 if (racct_enable) { 1308 PROC_LOCK(td->td_proc); 1309 error = racct_add(td->td_proc, RACCT_CORE, coresize); 1310 PROC_UNLOCK(td->td_proc); 1311 if (error != 0) { 1312 error = EFAULT; 1313 goto done; 1314 } 1315 } 1316#endif 1317 if (coresize >= limit) { 1318 error = EFAULT; 1319 goto done; 1320 } 1321 1322 /* 1323 * Allocate memory for building the header, fill it up, 1324 * and write it out following the notes. 1325 */ 1326 hdr = malloc(hdrsize, M_TEMP, M_WAITOK); 1327 error = __elfN(corehdr)(td, vp, cred, seginfo.count, hdr, hdrsize, 1328 ¬elst, notesz, gzfile); 1329 1330 /* Write the contents of all of the writable segments. */ 1331 if (error == 0) { 1332 Elf_Phdr *php; 1333 off_t offset; 1334 int i; 1335 1336 php = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr)) + 1; 1337 offset = round_page(hdrsize + notesz); 1338 for (i = 0; i < seginfo.count; i++) { 1339 error = core_output(vp, (caddr_t)(uintptr_t)php->p_vaddr, 1340 php->p_filesz, offset, cred, NOCRED, curthread, core_buf, gzfile); 1341 if (error != 0) 1342 break; 1343 offset += php->p_filesz; 1344 php++; 1345 } 1346 } 1347 if (error) { 1348 log(LOG_WARNING, 1349 "Failed to write core file for process %s (error %d)\n", 1350 curproc->p_comm, error); 1351 } 1352 1353done: 1354#ifdef COMPRESS_USER_CORES 1355 if (core_buf) 1356 free(core_buf, M_TEMP); 1357 if (gzfile) 1358 gzclose(gzfile); 1359#endif 1360 while ((ninfo = TAILQ_FIRST(¬elst)) != NULL) { 1361 TAILQ_REMOVE(¬elst, ninfo, link); 1362 free(ninfo, M_TEMP); 1363 } 1364 if (hdr != NULL) 1365 free(hdr, M_TEMP); 1366 1367 return (error); 1368} 1369 1370/* 1371 * A callback for each_writable_segment() to write out the segment's 1372 * program header entry. 1373 */ 1374static void 1375cb_put_phdr(entry, closure) 1376 vm_map_entry_t entry; 1377 void *closure; 1378{ 1379 struct phdr_closure *phc = (struct phdr_closure *)closure; 1380 Elf_Phdr *phdr = phc->phdr; 1381 1382 phc->offset = round_page(phc->offset); 1383 1384 phdr->p_type = PT_LOAD; 1385 phdr->p_offset = phc->offset; 1386 phdr->p_vaddr = entry->start; 1387 phdr->p_paddr = 0; 1388 phdr->p_filesz = phdr->p_memsz = entry->end - entry->start; 1389 phdr->p_align = PAGE_SIZE; 1390 phdr->p_flags = __elfN(untrans_prot)(entry->protection); 1391 1392 phc->offset += phdr->p_filesz; 1393 phc->phdr++; 1394} 1395 1396/* 1397 * A callback for each_writable_segment() to gather information about 1398 * the number of segments and their total size. 1399 */ 1400static void 1401cb_size_segment(entry, closure) 1402 vm_map_entry_t entry; 1403 void *closure; 1404{ 1405 struct sseg_closure *ssc = (struct sseg_closure *)closure; 1406 1407 ssc->count++; 1408 ssc->size += entry->end - entry->start; 1409} 1410 1411/* 1412 * For each writable segment in the process's memory map, call the given 1413 * function with a pointer to the map entry and some arbitrary 1414 * caller-supplied data. 1415 */ 1416static void 1417each_writable_segment(td, func, closure) 1418 struct thread *td; 1419 segment_callback func; 1420 void *closure; 1421{ 1422 struct proc *p = td->td_proc; 1423 vm_map_t map = &p->p_vmspace->vm_map; 1424 vm_map_entry_t entry; 1425 vm_object_t backing_object, object; 1426 boolean_t ignore_entry; 1427 1428 vm_map_lock_read(map); 1429 for (entry = map->header.next; entry != &map->header; 1430 entry = entry->next) { 1431 /* 1432 * Don't dump inaccessible mappings, deal with legacy 1433 * coredump mode. 1434 * 1435 * Note that read-only segments related to the elf binary 1436 * are marked MAP_ENTRY_NOCOREDUMP now so we no longer 1437 * need to arbitrarily ignore such segments. 1438 */ 1439 if (elf_legacy_coredump) { 1440 if ((entry->protection & VM_PROT_RW) != VM_PROT_RW) 1441 continue; 1442 } else { 1443 if ((entry->protection & VM_PROT_ALL) == 0) 1444 continue; 1445 } 1446 1447 /* 1448 * Dont include memory segment in the coredump if 1449 * MAP_NOCORE is set in mmap(2) or MADV_NOCORE in 1450 * madvise(2). Do not dump submaps (i.e. parts of the 1451 * kernel map). 1452 */ 1453 if (entry->eflags & (MAP_ENTRY_NOCOREDUMP|MAP_ENTRY_IS_SUB_MAP)) 1454 continue; 1455 1456 if ((object = entry->object.vm_object) == NULL) 1457 continue; 1458 1459 /* Ignore memory-mapped devices and such things. */ 1460 VM_OBJECT_RLOCK(object); 1461 while ((backing_object = object->backing_object) != NULL) { 1462 VM_OBJECT_RLOCK(backing_object); 1463 VM_OBJECT_RUNLOCK(object); 1464 object = backing_object; 1465 } 1466 ignore_entry = object->type != OBJT_DEFAULT && 1467 object->type != OBJT_SWAP && object->type != OBJT_VNODE && 1468 object->type != OBJT_PHYS; 1469 VM_OBJECT_RUNLOCK(object); 1470 if (ignore_entry) 1471 continue; 1472 1473 (*func)(entry, closure); 1474 } 1475 vm_map_unlock_read(map); 1476} 1477 1478/* 1479 * Write the core file header to the file, including padding up to 1480 * the page boundary. 1481 */ 1482static int 1483__elfN(corehdr)(struct thread *td, struct vnode *vp, struct ucred *cred, 1484 int numsegs, void *hdr, size_t hdrsize, struct note_info_list *notelst, 1485 size_t notesz, gzFile gzfile) 1486{ 1487 struct sbuf_drain_core_params params; 1488 struct note_info *ninfo; 1489 struct sbuf *sb; 1490 int error; 1491 1492 /* Fill in the header. */ 1493 bzero(hdr, hdrsize); 1494 __elfN(puthdr)(td, hdr, hdrsize, numsegs, notesz); 1495 1496 params.offset = 0; 1497 params.active_cred = cred; 1498 params.file_cred = NOCRED; 1499 params.td = td; 1500 params.vp = vp; 1501#ifdef COMPRESS_USER_CORES 1502 params.gzfile = gzfile; 1503#endif 1504 sb = sbuf_new(NULL, NULL, CORE_BUF_SIZE, SBUF_FIXEDLEN); 1505 sbuf_set_drain(sb, sbuf_drain_core_output, ¶ms); 1506 sbuf_start_section(sb, NULL); 1507 sbuf_bcat(sb, hdr, hdrsize); 1508 TAILQ_FOREACH(ninfo, notelst, link) 1509 __elfN(putnote)(ninfo, sb); 1510 /* Align up to a page boundary for the program segments. */ 1511 sbuf_end_section(sb, -1, PAGE_SIZE, 0); 1512 error = sbuf_finish(sb); 1513 sbuf_delete(sb); 1514 1515 return (error); 1516} 1517 1518static void 1519__elfN(prepare_notes)(struct thread *td, struct note_info_list *list, 1520 size_t *sizep) 1521{ 1522 struct proc *p; 1523 struct thread *thr; 1524 size_t size; 1525 1526 p = td->td_proc; 1527 size = 0; 1528 1529 size += register_note(list, NT_PRPSINFO, __elfN(note_prpsinfo), p); 1530 1531 /* 1532 * To have the debugger select the right thread (LWP) as the initial 1533 * thread, we dump the state of the thread passed to us in td first. 1534 * This is the thread that causes the core dump and thus likely to 1535 * be the right thread one wants to have selected in the debugger. 1536 */ 1537 thr = td; 1538 while (thr != NULL) { 1539 size += register_note(list, NT_PRSTATUS, 1540 __elfN(note_prstatus), thr); 1541 size += register_note(list, NT_FPREGSET, 1542 __elfN(note_fpregset), thr); 1543 size += register_note(list, NT_THRMISC, 1544 __elfN(note_thrmisc), thr); 1545 size += register_note(list, -1, 1546 __elfN(note_threadmd), thr); 1547 1548 thr = (thr == td) ? TAILQ_FIRST(&p->p_threads) : 1549 TAILQ_NEXT(thr, td_plist); 1550 if (thr == td) 1551 thr = TAILQ_NEXT(thr, td_plist); 1552 } 1553 1554 size += register_note(list, NT_PROCSTAT_PROC, 1555 __elfN(note_procstat_proc), p); 1556 size += register_note(list, NT_PROCSTAT_FILES, 1557 note_procstat_files, p); 1558 size += register_note(list, NT_PROCSTAT_VMMAP, 1559 note_procstat_vmmap, p); 1560 size += register_note(list, NT_PROCSTAT_GROUPS, 1561 note_procstat_groups, p); 1562 size += register_note(list, NT_PROCSTAT_UMASK, 1563 note_procstat_umask, p); 1564 size += register_note(list, NT_PROCSTAT_RLIMIT, 1565 note_procstat_rlimit, p); 1566 size += register_note(list, NT_PROCSTAT_OSREL, 1567 note_procstat_osrel, p); 1568 size += register_note(list, NT_PROCSTAT_PSSTRINGS, 1569 __elfN(note_procstat_psstrings), p); 1570 size += register_note(list, NT_PROCSTAT_AUXV, 1571 __elfN(note_procstat_auxv), p); 1572 1573 *sizep = size; 1574} 1575 1576static void 1577__elfN(puthdr)(struct thread *td, void *hdr, size_t hdrsize, int numsegs, 1578 size_t notesz) 1579{ 1580 Elf_Ehdr *ehdr; 1581 Elf_Phdr *phdr; 1582 struct phdr_closure phc; 1583 1584 ehdr = (Elf_Ehdr *)hdr; 1585 phdr = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr)); 1586 1587 ehdr->e_ident[EI_MAG0] = ELFMAG0; 1588 ehdr->e_ident[EI_MAG1] = ELFMAG1; 1589 ehdr->e_ident[EI_MAG2] = ELFMAG2; 1590 ehdr->e_ident[EI_MAG3] = ELFMAG3; 1591 ehdr->e_ident[EI_CLASS] = ELF_CLASS; 1592 ehdr->e_ident[EI_DATA] = ELF_DATA; 1593 ehdr->e_ident[EI_VERSION] = EV_CURRENT; 1594 ehdr->e_ident[EI_OSABI] = ELFOSABI_FREEBSD; 1595 ehdr->e_ident[EI_ABIVERSION] = 0; 1596 ehdr->e_ident[EI_PAD] = 0; 1597 ehdr->e_type = ET_CORE; 1598#if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 1599 ehdr->e_machine = ELF_ARCH32; 1600#else 1601 ehdr->e_machine = ELF_ARCH; 1602#endif 1603 ehdr->e_version = EV_CURRENT; 1604 ehdr->e_entry = 0; 1605 ehdr->e_phoff = sizeof(Elf_Ehdr); 1606 ehdr->e_flags = 0; 1607 ehdr->e_ehsize = sizeof(Elf_Ehdr); 1608 ehdr->e_phentsize = sizeof(Elf_Phdr); 1609 ehdr->e_phnum = numsegs + 1; 1610 ehdr->e_shentsize = sizeof(Elf_Shdr); 1611 ehdr->e_shnum = 0; 1612 ehdr->e_shstrndx = SHN_UNDEF; 1613 1614 /* 1615 * Fill in the program header entries. 1616 */ 1617 1618 /* The note segement. */ 1619 phdr->p_type = PT_NOTE; 1620 phdr->p_offset = hdrsize; 1621 phdr->p_vaddr = 0; 1622 phdr->p_paddr = 0; 1623 phdr->p_filesz = notesz; 1624 phdr->p_memsz = 0; 1625 phdr->p_flags = PF_R; 1626 phdr->p_align = ELF_NOTE_ROUNDSIZE; 1627 phdr++; 1628 1629 /* All the writable segments from the program. */ 1630 phc.phdr = phdr; 1631 phc.offset = round_page(hdrsize + notesz); 1632 each_writable_segment(td, cb_put_phdr, &phc); 1633} 1634 1635static size_t 1636register_note(struct note_info_list *list, int type, outfunc_t out, void *arg) 1637{ 1638 struct note_info *ninfo; 1639 size_t size, notesize; 1640 1641 size = 0; 1642 out(arg, NULL, &size); 1643 ninfo = malloc(sizeof(*ninfo), M_TEMP, M_ZERO | M_WAITOK); 1644 ninfo->type = type; 1645 ninfo->outfunc = out; 1646 ninfo->outarg = arg; 1647 ninfo->outsize = size; 1648 TAILQ_INSERT_TAIL(list, ninfo, link); 1649 1650 if (type == -1) 1651 return (size); 1652 1653 notesize = sizeof(Elf_Note) + /* note header */ 1654 roundup2(sizeof(FREEBSD_ABI_VENDOR), ELF_NOTE_ROUNDSIZE) + 1655 /* note name */ 1656 roundup2(size, ELF_NOTE_ROUNDSIZE); /* note description */ 1657 1658 return (notesize); 1659} 1660 1661static size_t 1662append_note_data(const void *src, void *dst, size_t len) 1663{ 1664 size_t padded_len; 1665 1666 padded_len = roundup2(len, ELF_NOTE_ROUNDSIZE); 1667 if (dst != NULL) { 1668 bcopy(src, dst, len); 1669 bzero((char *)dst + len, padded_len - len); 1670 } 1671 return (padded_len); 1672} 1673 1674size_t 1675__elfN(populate_note)(int type, void *src, void *dst, size_t size, void **descp) 1676{ 1677 Elf_Note *note; 1678 char *buf; 1679 size_t notesize; 1680 1681 buf = dst; 1682 if (buf != NULL) { 1683 note = (Elf_Note *)buf; 1684 note->n_namesz = sizeof(FREEBSD_ABI_VENDOR); 1685 note->n_descsz = size; 1686 note->n_type = type; 1687 buf += sizeof(*note); 1688 buf += append_note_data(FREEBSD_ABI_VENDOR, buf, 1689 sizeof(FREEBSD_ABI_VENDOR)); 1690 append_note_data(src, buf, size); 1691 if (descp != NULL) 1692 *descp = buf; 1693 } 1694 1695 notesize = sizeof(Elf_Note) + /* note header */ 1696 roundup2(sizeof(FREEBSD_ABI_VENDOR), ELF_NOTE_ROUNDSIZE) + 1697 /* note name */ 1698 roundup2(size, ELF_NOTE_ROUNDSIZE); /* note description */ 1699 1700 return (notesize); 1701} 1702 1703static void 1704__elfN(putnote)(struct note_info *ninfo, struct sbuf *sb) 1705{ 1706 Elf_Note note; 1707 ssize_t old_len, sect_len; 1708 size_t new_len, descsz, i; 1709 1710 if (ninfo->type == -1) { 1711 ninfo->outfunc(ninfo->outarg, sb, &ninfo->outsize); 1712 return; 1713 } 1714 1715 note.n_namesz = sizeof(FREEBSD_ABI_VENDOR); 1716 note.n_descsz = ninfo->outsize; 1717 note.n_type = ninfo->type; 1718 1719 sbuf_bcat(sb, ¬e, sizeof(note)); 1720 sbuf_start_section(sb, &old_len); 1721 sbuf_bcat(sb, FREEBSD_ABI_VENDOR, sizeof(FREEBSD_ABI_VENDOR)); 1722 sbuf_end_section(sb, old_len, ELF_NOTE_ROUNDSIZE, 0); 1723 if (note.n_descsz == 0) 1724 return; 1725 sbuf_start_section(sb, &old_len); 1726 ninfo->outfunc(ninfo->outarg, sb, &ninfo->outsize); 1727 sect_len = sbuf_end_section(sb, old_len, ELF_NOTE_ROUNDSIZE, 0); 1728 if (sect_len < 0) 1729 return; 1730 1731 new_len = (size_t)sect_len; 1732 descsz = roundup(note.n_descsz, ELF_NOTE_ROUNDSIZE); 1733 if (new_len < descsz) { 1734 /* 1735 * It is expected that individual note emitters will correctly 1736 * predict their expected output size and fill up to that size 1737 * themselves, padding in a format-specific way if needed. 1738 * However, in case they don't, just do it here with zeros. 1739 */ 1740 for (i = 0; i < descsz - new_len; i++) 1741 sbuf_putc(sb, 0); 1742 } else if (new_len > descsz) { 1743 /* 1744 * We can't always truncate sb -- we may have drained some 1745 * of it already. 1746 */ 1747 KASSERT(new_len == descsz, ("%s: Note type %u changed as we " 1748 "read it (%zu > %zu). Since it is longer than " 1749 "expected, this coredump's notes are corrupt. THIS " 1750 "IS A BUG in the note_procstat routine for type %u.\n", 1751 __func__, (unsigned)note.n_type, new_len, descsz, 1752 (unsigned)note.n_type)); 1753 } 1754} 1755 1756/* 1757 * Miscellaneous note out functions. 1758 */ 1759 1760#if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 1761#include <compat/freebsd32/freebsd32.h> 1762 1763typedef struct prstatus32 elf_prstatus_t; 1764typedef struct prpsinfo32 elf_prpsinfo_t; 1765typedef struct fpreg32 elf_prfpregset_t; 1766typedef struct fpreg32 elf_fpregset_t; 1767typedef struct reg32 elf_gregset_t; 1768typedef struct thrmisc32 elf_thrmisc_t; 1769#define ELF_KERN_PROC_MASK KERN_PROC_MASK32 1770typedef struct kinfo_proc32 elf_kinfo_proc_t; 1771typedef uint32_t elf_ps_strings_t; 1772#else 1773typedef prstatus_t elf_prstatus_t; 1774typedef prpsinfo_t elf_prpsinfo_t; 1775typedef prfpregset_t elf_prfpregset_t; 1776typedef prfpregset_t elf_fpregset_t; 1777typedef gregset_t elf_gregset_t; 1778typedef thrmisc_t elf_thrmisc_t; 1779#define ELF_KERN_PROC_MASK 0 1780typedef struct kinfo_proc elf_kinfo_proc_t; 1781typedef vm_offset_t elf_ps_strings_t; 1782#endif 1783 1784static void 1785__elfN(note_prpsinfo)(void *arg, struct sbuf *sb, size_t *sizep) 1786{ 1787 struct sbuf sbarg; 1788 size_t len; 1789 char *cp, *end; 1790 struct proc *p; 1791 elf_prpsinfo_t *psinfo; 1792 int error; 1793 1794 p = (struct proc *)arg; 1795 if (sb != NULL) { 1796 KASSERT(*sizep == sizeof(*psinfo), ("invalid size")); 1797 psinfo = malloc(sizeof(*psinfo), M_TEMP, M_ZERO | M_WAITOK); 1798 psinfo->pr_version = PRPSINFO_VERSION; 1799 psinfo->pr_psinfosz = sizeof(elf_prpsinfo_t); 1800 strlcpy(psinfo->pr_fname, p->p_comm, sizeof(psinfo->pr_fname)); 1801 PROC_LOCK(p); 1802 if (p->p_args != NULL) { 1803 len = sizeof(psinfo->pr_psargs) - 1; 1804 if (len > p->p_args->ar_length) 1805 len = p->p_args->ar_length; 1806 memcpy(psinfo->pr_psargs, p->p_args->ar_args, len); 1807 PROC_UNLOCK(p); 1808 error = 0; 1809 } else { 1810 _PHOLD(p); 1811 PROC_UNLOCK(p); 1812 sbuf_new(&sbarg, psinfo->pr_psargs, 1813 sizeof(psinfo->pr_psargs), SBUF_FIXEDLEN); 1814 error = proc_getargv(curthread, p, &sbarg); 1815 PRELE(p); 1816 if (sbuf_finish(&sbarg) == 0) 1817 len = sbuf_len(&sbarg) - 1; 1818 else 1819 len = sizeof(psinfo->pr_psargs) - 1; 1820 sbuf_delete(&sbarg); 1821 } 1822 if (error || len == 0) 1823 strlcpy(psinfo->pr_psargs, p->p_comm, 1824 sizeof(psinfo->pr_psargs)); 1825 else { 1826 KASSERT(len < sizeof(psinfo->pr_psargs), 1827 ("len is too long: %zu vs %zu", len, 1828 sizeof(psinfo->pr_psargs))); 1829 cp = psinfo->pr_psargs; 1830 end = cp + len - 1; 1831 for (;;) { 1832 cp = memchr(cp, '\0', end - cp); 1833 if (cp == NULL) 1834 break; 1835 *cp = ' '; 1836 } 1837 } 1838 psinfo->pr_pid = p->p_pid; 1839 sbuf_bcat(sb, psinfo, sizeof(*psinfo)); 1840 free(psinfo, M_TEMP); 1841 } 1842 *sizep = sizeof(*psinfo); 1843} 1844 1845static void 1846__elfN(note_prstatus)(void *arg, struct sbuf *sb, size_t *sizep) 1847{ 1848 struct thread *td; 1849 elf_prstatus_t *status; 1850 1851 td = (struct thread *)arg; 1852 if (sb != NULL) { 1853 KASSERT(*sizep == sizeof(*status), ("invalid size")); 1854 status = malloc(sizeof(*status), M_TEMP, M_ZERO | M_WAITOK); 1855 status->pr_version = PRSTATUS_VERSION; 1856 status->pr_statussz = sizeof(elf_prstatus_t); 1857 status->pr_gregsetsz = sizeof(elf_gregset_t); 1858 status->pr_fpregsetsz = sizeof(elf_fpregset_t); 1859 status->pr_osreldate = osreldate; 1860 status->pr_cursig = td->td_proc->p_sig; 1861 status->pr_pid = td->td_tid; 1862#if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 1863 fill_regs32(td, &status->pr_reg); 1864#else 1865 fill_regs(td, &status->pr_reg); 1866#endif 1867 sbuf_bcat(sb, status, sizeof(*status)); 1868 free(status, M_TEMP); 1869 } 1870 *sizep = sizeof(*status); 1871} 1872 1873static void 1874__elfN(note_fpregset)(void *arg, struct sbuf *sb, size_t *sizep) 1875{ 1876 struct thread *td; 1877 elf_prfpregset_t *fpregset; 1878 1879 td = (struct thread *)arg; 1880 if (sb != NULL) { 1881 KASSERT(*sizep == sizeof(*fpregset), ("invalid size")); 1882 fpregset = malloc(sizeof(*fpregset), M_TEMP, M_ZERO | M_WAITOK); 1883#if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 1884 fill_fpregs32(td, fpregset); 1885#else 1886 fill_fpregs(td, fpregset); 1887#endif 1888 sbuf_bcat(sb, fpregset, sizeof(*fpregset)); 1889 free(fpregset, M_TEMP); 1890 } 1891 *sizep = sizeof(*fpregset); 1892} 1893 1894static void 1895__elfN(note_thrmisc)(void *arg, struct sbuf *sb, size_t *sizep) 1896{ 1897 struct thread *td; 1898 elf_thrmisc_t thrmisc; 1899 1900 td = (struct thread *)arg; 1901 if (sb != NULL) { 1902 KASSERT(*sizep == sizeof(thrmisc), ("invalid size")); 1903 bzero(&thrmisc._pad, sizeof(thrmisc._pad)); 1904 strcpy(thrmisc.pr_tname, td->td_name); 1905 sbuf_bcat(sb, &thrmisc, sizeof(thrmisc)); 1906 } 1907 *sizep = sizeof(thrmisc); 1908} 1909 1910/* 1911 * Allow for MD specific notes, as well as any MD 1912 * specific preparations for writing MI notes. 1913 */ 1914static void 1915__elfN(note_threadmd)(void *arg, struct sbuf *sb, size_t *sizep) 1916{ 1917 struct thread *td; 1918 void *buf; 1919 size_t size; 1920 1921 td = (struct thread *)arg; 1922 size = *sizep; 1923 if (size != 0 && sb != NULL) 1924 buf = malloc(size, M_TEMP, M_ZERO | M_WAITOK); 1925 else 1926 buf = NULL; 1927 size = 0; 1928 __elfN(dump_thread)(td, buf, &size); 1929 KASSERT(sb == NULL || *sizep == size, ("invalid size")); 1930 if (size != 0 && sb != NULL) 1931 sbuf_bcat(sb, buf, size); 1932 free(buf, M_TEMP); 1933 *sizep = size; 1934} 1935 1936#ifdef KINFO_PROC_SIZE 1937CTASSERT(sizeof(struct kinfo_proc) == KINFO_PROC_SIZE); 1938#endif 1939 1940static void 1941__elfN(note_procstat_proc)(void *arg, struct sbuf *sb, size_t *sizep) 1942{ 1943 struct proc *p; 1944 size_t size; 1945 int structsize; 1946 1947 p = (struct proc *)arg; 1948 size = sizeof(structsize) + p->p_numthreads * 1949 sizeof(elf_kinfo_proc_t); 1950 1951 if (sb != NULL) { 1952 KASSERT(*sizep == size, ("invalid size")); 1953 structsize = sizeof(elf_kinfo_proc_t); 1954 sbuf_bcat(sb, &structsize, sizeof(structsize)); 1955 PROC_LOCK(p); 1956 kern_proc_out(p, sb, ELF_KERN_PROC_MASK); 1957 } 1958 *sizep = size; 1959} 1960 1961#ifdef KINFO_FILE_SIZE 1962CTASSERT(sizeof(struct kinfo_file) == KINFO_FILE_SIZE); 1963#endif 1964 1965static void 1966note_procstat_files(void *arg, struct sbuf *sb, size_t *sizep) 1967{ 1968 struct proc *p; 1969 size_t size, sect_sz, i; 1970 ssize_t start_len, sect_len; 1971 int structsize, filedesc_flags; 1972 1973 if (coredump_pack_fileinfo) 1974 filedesc_flags = KERN_FILEDESC_PACK_KINFO; 1975 else 1976 filedesc_flags = 0; 1977 1978 p = (struct proc *)arg; 1979 structsize = sizeof(struct kinfo_file); 1980 if (sb == NULL) { 1981 size = 0; 1982 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN); 1983 sbuf_set_drain(sb, sbuf_drain_count, &size); 1984 sbuf_bcat(sb, &structsize, sizeof(structsize)); 1985 PROC_LOCK(p); 1986 kern_proc_filedesc_out(p, sb, -1, filedesc_flags); 1987 sbuf_finish(sb); 1988 sbuf_delete(sb); 1989 *sizep = size; 1990 } else { 1991 sbuf_start_section(sb, &start_len); 1992 1993 sbuf_bcat(sb, &structsize, sizeof(structsize)); 1994 PROC_LOCK(p); 1995 kern_proc_filedesc_out(p, sb, *sizep - sizeof(structsize), 1996 filedesc_flags); 1997 1998 sect_len = sbuf_end_section(sb, start_len, 0, 0); 1999 if (sect_len < 0) 2000 return; 2001 sect_sz = sect_len; 2002 2003 KASSERT(sect_sz <= *sizep, 2004 ("kern_proc_filedesc_out did not respect maxlen; " 2005 "requested %zu, got %zu", *sizep - sizeof(structsize), 2006 sect_sz - sizeof(structsize))); 2007 2008 for (i = 0; i < *sizep - sect_sz && sb->s_error == 0; i++) 2009 sbuf_putc(sb, 0); 2010 } 2011} 2012 2013#ifdef KINFO_VMENTRY_SIZE 2014CTASSERT(sizeof(struct kinfo_vmentry) == KINFO_VMENTRY_SIZE); 2015#endif 2016 2017static void 2018note_procstat_vmmap(void *arg, struct sbuf *sb, size_t *sizep) 2019{ 2020 struct proc *p; 2021 size_t size; 2022 int structsize, vmmap_flags; 2023 2024 if (coredump_pack_vmmapinfo) 2025 vmmap_flags = KERN_VMMAP_PACK_KINFO; 2026 else 2027 vmmap_flags = 0; 2028 2029 p = (struct proc *)arg; 2030 structsize = sizeof(struct kinfo_vmentry); 2031 if (sb == NULL) { 2032 size = 0; 2033 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN); 2034 sbuf_set_drain(sb, sbuf_drain_count, &size); 2035 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2036 PROC_LOCK(p); 2037 kern_proc_vmmap_out(p, sb, -1, vmmap_flags); 2038 sbuf_finish(sb); 2039 sbuf_delete(sb); 2040 *sizep = size; 2041 } else { 2042 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2043 PROC_LOCK(p); 2044 kern_proc_vmmap_out(p, sb, *sizep - sizeof(structsize), 2045 vmmap_flags); 2046 } 2047} 2048 2049static void 2050note_procstat_groups(void *arg, struct sbuf *sb, size_t *sizep) 2051{ 2052 struct proc *p; 2053 size_t size; 2054 int structsize; 2055 2056 p = (struct proc *)arg; 2057 size = sizeof(structsize) + p->p_ucred->cr_ngroups * sizeof(gid_t); 2058 if (sb != NULL) { 2059 KASSERT(*sizep == size, ("invalid size")); 2060 structsize = sizeof(gid_t); 2061 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2062 sbuf_bcat(sb, p->p_ucred->cr_groups, p->p_ucred->cr_ngroups * 2063 sizeof(gid_t)); 2064 } 2065 *sizep = size; 2066} 2067 2068static void 2069note_procstat_umask(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) + sizeof(p->p_fd->fd_cmask); 2077 if (sb != NULL) { 2078 KASSERT(*sizep == size, ("invalid size")); 2079 structsize = sizeof(p->p_fd->fd_cmask); 2080 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2081 sbuf_bcat(sb, &p->p_fd->fd_cmask, sizeof(p->p_fd->fd_cmask)); 2082 } 2083 *sizep = size; 2084} 2085 2086static void 2087note_procstat_rlimit(void *arg, struct sbuf *sb, size_t *sizep) 2088{ 2089 struct proc *p; 2090 struct rlimit rlim[RLIM_NLIMITS]; 2091 size_t size; 2092 int structsize, i; 2093 2094 p = (struct proc *)arg; 2095 size = sizeof(structsize) + sizeof(rlim); 2096 if (sb != NULL) { 2097 KASSERT(*sizep == size, ("invalid size")); 2098 structsize = sizeof(rlim); 2099 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2100 PROC_LOCK(p); 2101 for (i = 0; i < RLIM_NLIMITS; i++) 2102 lim_rlimit(p, i, &rlim[i]); 2103 PROC_UNLOCK(p); 2104 sbuf_bcat(sb, rlim, sizeof(rlim)); 2105 } 2106 *sizep = size; 2107} 2108 2109static void 2110note_procstat_osrel(void *arg, struct sbuf *sb, size_t *sizep) 2111{ 2112 struct proc *p; 2113 size_t size; 2114 int structsize; 2115 2116 p = (struct proc *)arg; 2117 size = sizeof(structsize) + sizeof(p->p_osrel); 2118 if (sb != NULL) { 2119 KASSERT(*sizep == size, ("invalid size")); 2120 structsize = sizeof(p->p_osrel); 2121 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2122 sbuf_bcat(sb, &p->p_osrel, sizeof(p->p_osrel)); 2123 } 2124 *sizep = size; 2125} 2126 2127static void 2128__elfN(note_procstat_psstrings)(void *arg, struct sbuf *sb, size_t *sizep) 2129{ 2130 struct proc *p; 2131 elf_ps_strings_t ps_strings; 2132 size_t size; 2133 int structsize; 2134 2135 p = (struct proc *)arg; 2136 size = sizeof(structsize) + sizeof(ps_strings); 2137 if (sb != NULL) { 2138 KASSERT(*sizep == size, ("invalid size")); 2139 structsize = sizeof(ps_strings); 2140#if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 2141 ps_strings = PTROUT(p->p_sysent->sv_psstrings); 2142#else 2143 ps_strings = p->p_sysent->sv_psstrings; 2144#endif 2145 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2146 sbuf_bcat(sb, &ps_strings, sizeof(ps_strings)); 2147 } 2148 *sizep = size; 2149} 2150 2151static void 2152__elfN(note_procstat_auxv)(void *arg, struct sbuf *sb, size_t *sizep) 2153{ 2154 struct proc *p; 2155 size_t size; 2156 int structsize; 2157 2158 p = (struct proc *)arg; 2159 if (sb == NULL) { 2160 size = 0; 2161 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN); 2162 sbuf_set_drain(sb, sbuf_drain_count, &size); 2163 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2164 PHOLD(p); 2165 proc_getauxv(curthread, p, sb); 2166 PRELE(p); 2167 sbuf_finish(sb); 2168 sbuf_delete(sb); 2169 *sizep = size; 2170 } else { 2171 structsize = sizeof(Elf_Auxinfo); 2172 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2173 PHOLD(p); 2174 proc_getauxv(curthread, p, sb); 2175 PRELE(p); 2176 } 2177} 2178 2179static boolean_t 2180__elfN(parse_notes)(struct image_params *imgp, Elf_Brandnote *checknote, 2181 int32_t *osrel, const Elf_Phdr *pnote) 2182{ 2183 const Elf_Note *note, *note0, *note_end; 2184 const char *note_name; 2185 char *buf; 2186 int i, error; 2187 boolean_t res; 2188 2189 /* We need some limit, might as well use PAGE_SIZE. */ 2190 if (pnote == NULL || pnote->p_filesz > PAGE_SIZE) 2191 return (FALSE); 2192 ASSERT_VOP_LOCKED(imgp->vp, "parse_notes"); 2193 if (pnote->p_offset > PAGE_SIZE || 2194 pnote->p_filesz > PAGE_SIZE - pnote->p_offset) { 2195 VOP_UNLOCK(imgp->vp, 0); 2196 buf = malloc(pnote->p_filesz, M_TEMP, M_WAITOK); 2197 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY); 2198 error = vn_rdwr(UIO_READ, imgp->vp, buf, pnote->p_filesz, 2199 pnote->p_offset, UIO_SYSSPACE, IO_NODELOCKED, 2200 curthread->td_ucred, NOCRED, NULL, curthread); 2201 if (error != 0) { 2202 uprintf("i/o error PT_NOTE\n"); 2203 res = FALSE; 2204 goto ret; 2205 } 2206 note = note0 = (const Elf_Note *)buf; 2207 note_end = (const Elf_Note *)(buf + pnote->p_filesz); 2208 } else { 2209 note = note0 = (const Elf_Note *)(imgp->image_header + 2210 pnote->p_offset); 2211 note_end = (const Elf_Note *)(imgp->image_header + 2212 pnote->p_offset + pnote->p_filesz); 2213 buf = NULL; 2214 } 2215 for (i = 0; i < 100 && note >= note0 && note < note_end; i++) { 2216 if (!aligned(note, Elf32_Addr) || (const char *)note_end - 2217 (const char *)note < sizeof(Elf_Note)) { 2218 res = FALSE; 2219 goto ret; 2220 } 2221 if (note->n_namesz != checknote->hdr.n_namesz || 2222 note->n_descsz != checknote->hdr.n_descsz || 2223 note->n_type != checknote->hdr.n_type) 2224 goto nextnote; 2225 note_name = (const char *)(note + 1); 2226 if (note_name + checknote->hdr.n_namesz >= 2227 (const char *)note_end || strncmp(checknote->vendor, 2228 note_name, checknote->hdr.n_namesz) != 0) 2229 goto nextnote; 2230 2231 /* 2232 * Fetch the osreldate for binary 2233 * from the ELF OSABI-note if necessary. 2234 */ 2235 if ((checknote->flags & BN_TRANSLATE_OSREL) != 0 && 2236 checknote->trans_osrel != NULL) { 2237 res = checknote->trans_osrel(note, osrel); 2238 goto ret; 2239 } 2240 res = TRUE; 2241 goto ret; 2242nextnote: 2243 note = (const Elf_Note *)((const char *)(note + 1) + 2244 roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE) + 2245 roundup2(note->n_descsz, ELF_NOTE_ROUNDSIZE)); 2246 } 2247 res = FALSE; 2248ret: 2249 free(buf, M_TEMP); 2250 return (res); 2251} 2252 2253/* 2254 * Try to find the appropriate ABI-note section for checknote, 2255 * fetch the osreldate for binary from the ELF OSABI-note. Only the 2256 * first page of the image is searched, the same as for headers. 2257 */ 2258static boolean_t 2259__elfN(check_note)(struct image_params *imgp, Elf_Brandnote *checknote, 2260 int32_t *osrel) 2261{ 2262 const Elf_Phdr *phdr; 2263 const Elf_Ehdr *hdr; 2264 int i; 2265 2266 hdr = (const Elf_Ehdr *)imgp->image_header; 2267 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 2268 2269 for (i = 0; i < hdr->e_phnum; i++) { 2270 if (phdr[i].p_type == PT_NOTE && 2271 __elfN(parse_notes)(imgp, checknote, osrel, &phdr[i])) 2272 return (TRUE); 2273 } 2274 return (FALSE); 2275 2276} 2277 2278/* 2279 * Tell kern_execve.c about it, with a little help from the linker. 2280 */ 2281static struct execsw __elfN(execsw) = { 2282 __CONCAT(exec_, __elfN(imgact)), 2283 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) 2284}; 2285EXEC_SET(__CONCAT(elf, __ELF_WORD_SIZE), __elfN(execsw)); 2286 2287#ifdef COMPRESS_USER_CORES 2288/* 2289 * Compress and write out a core segment for a user process. 2290 * 2291 * 'inbuf' is the starting address of a VM segment in the process' address 2292 * space that is to be compressed and written out to the core file. 'dest_buf' 2293 * is a buffer in the kernel's address space. The segment is copied from 2294 * 'inbuf' to 'dest_buf' first before being processed by the compression 2295 * routine gzwrite(). This copying is necessary because the content of the VM 2296 * segment may change between the compression pass and the crc-computation pass 2297 * in gzwrite(). This is because realtime threads may preempt the UNIX kernel. 2298 * 2299 * If inbuf is NULL it is assumed that data is already copied to 'dest_buf'. 2300 */ 2301static int 2302compress_core (gzFile file, char *inbuf, char *dest_buf, unsigned int len, 2303 struct thread *td) 2304{ 2305 int len_compressed; 2306 int error = 0; 2307 unsigned int chunk_len; 2308 2309 while (len) { 2310 if (inbuf != NULL) { 2311 chunk_len = (len > CORE_BUF_SIZE) ? CORE_BUF_SIZE : len; 2312 copyin(inbuf, dest_buf, chunk_len); 2313 inbuf += chunk_len; 2314 } else { 2315 chunk_len = len; 2316 } 2317 len_compressed = gzwrite(file, dest_buf, chunk_len); 2318 2319 EVENTHANDLER_INVOKE(app_coredump_progress, td, len_compressed); 2320 2321 if ((unsigned int)len_compressed != chunk_len) { 2322 log(LOG_WARNING, 2323 "compress_core: length mismatch (0x%x returned, " 2324 "0x%x expected)\n", len_compressed, chunk_len); 2325 EVENTHANDLER_INVOKE(app_coredump_error, td, 2326 "compress_core: length mismatch %x -> %x", 2327 chunk_len, len_compressed); 2328 error = EFAULT; 2329 break; 2330 } 2331 len -= chunk_len; 2332 maybe_yield(); 2333 } 2334 2335 return (error); 2336} 2337#endif /* COMPRESS_USER_CORES */ 2338 2339static vm_prot_t 2340__elfN(trans_prot)(Elf_Word flags) 2341{ 2342 vm_prot_t prot; 2343 2344 prot = 0; 2345 if (flags & PF_X) 2346 prot |= VM_PROT_EXECUTE; 2347 if (flags & PF_W) 2348 prot |= VM_PROT_WRITE; 2349 if (flags & PF_R) 2350 prot |= VM_PROT_READ; 2351#if __ELF_WORD_SIZE == 32 2352#if defined(__amd64__) || defined(__ia64__) 2353 if (i386_read_exec && (flags & PF_R)) 2354 prot |= VM_PROT_EXECUTE; 2355#endif 2356#endif 2357 return (prot); 2358} 2359 2360static Elf_Word 2361__elfN(untrans_prot)(vm_prot_t prot) 2362{ 2363 Elf_Word flags; 2364 2365 flags = 0; 2366 if (prot & VM_PROT_EXECUTE) 2367 flags |= PF_X; 2368 if (prot & VM_PROT_READ) 2369 flags |= PF_R; 2370 if (prot & VM_PROT_WRITE) 2371 flags |= PF_W; 2372 return (flags); 2373} 2374