Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
FreeBSD/Linux Kernel Cross Reference
sys/kern/imgact_elf.c
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
SearchContext: - none - 3 - 10
1 /*- 2 * Copyright (c) 2000 David O'Brien 3 * Copyright (c) 1995-1996 Søren Schmidt 4 * Copyright (c) 1996 Peter Wemm 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer 12 * in this position and unchanged. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. The name of the author may not be used to endorse or promote products 17 * derived from this software without specific prior written permission 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD$"); 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/capability.h> 40 #include <sys/exec.h> 41 #include <sys/fcntl.h> 42 #include <sys/filedesc.h> 43 #include <sys/imgact.h> 44 #include <sys/imgact_elf.h> 45 #include <sys/kernel.h> 46 #include <sys/lock.h> 47 #include <sys/malloc.h> 48 #include <sys/mount.h> 49 #include <sys/mutex.h> 50 #include <sys/mman.h> 51 #include <sys/namei.h> 52 #include <sys/pioctl.h> 53 #include <sys/proc.h> 54 #include <sys/procfs.h> 55 #include <sys/racct.h> 56 #include <sys/resourcevar.h> 57 #include <sys/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 88 static int __elfN(check_header)(const Elf_Ehdr *hdr); 89 static Elf_Brandinfo *__elfN(get_brandinfo)(struct image_params *imgp, 90 const char *interp, int interp_name_len, int32_t *osrel); 91 static int __elfN(load_file)(struct proc *p, const char *file, u_long *addr, 92 u_long *entry, size_t pagesize); 93 static int __elfN(load_section)(struct vmspace *vmspace, vm_object_t object, 94 vm_offset_t offset, caddr_t vmaddr, size_t memsz, size_t filsz, 95 vm_prot_t prot, size_t pagesize); 96 static int __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp); 97 static boolean_t __elfN(freebsd_trans_osrel)(const Elf_Note *note, 98 int32_t *osrel); 99 static boolean_t kfreebsd_trans_osrel(const Elf_Note *note, int32_t *osrel); 100 static boolean_t __elfN(check_note)(struct image_params *imgp, 101 Elf_Brandnote *checknote, int32_t *osrel); 102 static vm_prot_t __elfN(trans_prot)(Elf_Word); 103 static Elf_Word __elfN(untrans_prot)(vm_prot_t); 104 105 SYSCTL_NODE(_kern, OID_AUTO, __CONCAT(elf, __ELF_WORD_SIZE), CTLFLAG_RW, 0, 106 ""); 107 108 #ifdef COMPRESS_USER_CORES 109 static int compress_core(gzFile, char *, char *, unsigned int, 110 struct thread * td); 111 #endif 112 #define CORE_BUF_SIZE (16 * 1024) 113 114 int __elfN(fallback_brand) = -1; 115 SYSCTL_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"); 118 TUNABLE_INT("kern.elf" __XSTRING(__ELF_WORD_SIZE) ".fallback_brand", 119 &__elfN(fallback_brand)); 120 121 static int elf_legacy_coredump = 0; 122 SYSCTL_INT(_debug, OID_AUTO, __elfN(legacy_coredump), CTLFLAG_RW, 123 &elf_legacy_coredump, 0, ""); 124 125 int __elfN(nxstack) = 126 #if defined(__amd64__) || defined(__powerpc64__) /* both 64 and 32 bit */ 127 1; 128 #else 129 0; 130 #endif 131 SYSCTL_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__) 137 int i386_read_exec = 0; 138 SYSCTL_INT(_kern_elf32, OID_AUTO, read_exec, CTLFLAG_RW, &i386_read_exec, 0, 139 "enable execution from readable segments"); 140 #endif 141 #endif 142 143 static 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)) 148 149 static const char FREEBSD_ABI_VENDOR[] = "FreeBSD"; 150 151 Elf_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 }; 159 160 static 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 } 171 172 static const char GNU_ABI_VENDOR[] = "GNU"; 173 static int GNU_KFREEBSD_ABI_DESC = 3; 174 175 Elf_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 }; 183 184 static boolean_t 185 kfreebsd_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 } 205 206 int 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 } 224 225 int 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 } 240 241 int 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 } 258 259 static 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; 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 for (i = 0; i < MAX_BRANDS; i++) { 277 bi = elf_brand_list[i]; 278 if (bi == NULL) 279 continue; 280 if (hdr->e_machine == bi->machine && (bi->flags & 281 (BI_BRAND_NOTE|BI_BRAND_NOTE_MANDATORY)) != 0) { 282 ret = __elfN(check_note)(imgp, bi->brand_note, osrel); 283 if (ret) 284 return (bi); 285 } 286 } 287 288 /* If the executable has a brand, search for it in the brand list. */ 289 for (i = 0; i < MAX_BRANDS; i++) { 290 bi = elf_brand_list[i]; 291 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY) 292 continue; 293 if (hdr->e_machine == bi->machine && 294 (hdr->e_ident[EI_OSABI] == bi->brand || 295 strncmp((const char *)&hdr->e_ident[OLD_EI_BRAND], 296 bi->compat_3_brand, strlen(bi->compat_3_brand)) == 0)) 297 return (bi); 298 } 299 300 /* Lacking a known brand, search for a recognized interpreter. */ 301 if (interp != NULL) { 302 for (i = 0; i < MAX_BRANDS; i++) { 303 bi = elf_brand_list[i]; 304 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY) 305 continue; 306 if (hdr->e_machine == bi->machine && 307 /* ELF image p_filesz includes terminating zero */ 308 strlen(bi->interp_path) + 1 == interp_name_len && 309 strncmp(interp, bi->interp_path, interp_name_len) 310 == 0) 311 return (bi); 312 } 313 } 314 315 /* Lacking a recognized interpreter, try the default brand */ 316 for (i = 0; i < MAX_BRANDS; i++) { 317 bi = elf_brand_list[i]; 318 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY) 319 continue; 320 if (hdr->e_machine == bi->machine && 321 __elfN(fallback_brand) == bi->brand) 322 return (bi); 323 } 324 return (NULL); 325 } 326 327 static int 328 __elfN(check_header)(const Elf_Ehdr *hdr) 329 { 330 Elf_Brandinfo *bi; 331 int i; 332 333 if (!IS_ELF(*hdr) || 334 hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS || 335 hdr->e_ident[EI_DATA] != ELF_TARG_DATA || 336 hdr->e_ident[EI_VERSION] != EV_CURRENT || 337 hdr->e_phentsize != sizeof(Elf_Phdr) || 338 hdr->e_version != ELF_TARG_VER) 339 return (ENOEXEC); 340 341 /* 342 * Make sure we have at least one brand for this machine. 343 */ 344 345 for (i = 0; i < MAX_BRANDS; i++) { 346 bi = elf_brand_list[i]; 347 if (bi != NULL && bi->machine == hdr->e_machine) 348 break; 349 } 350 if (i == MAX_BRANDS) 351 return (ENOEXEC); 352 353 return (0); 354 } 355 356 static int 357 __elfN(map_partial)(vm_map_t map, vm_object_t object, vm_ooffset_t offset, 358 vm_offset_t start, vm_offset_t end, vm_prot_t prot) 359 { 360 struct sf_buf *sf; 361 int error; 362 vm_offset_t off; 363 364 /* 365 * Create the page if it doesn't exist yet. Ignore errors. 366 */ 367 vm_map_lock(map); 368 vm_map_insert(map, NULL, 0, trunc_page(start), round_page(end), 369 VM_PROT_ALL, VM_PROT_ALL, 0); 370 vm_map_unlock(map); 371 372 /* 373 * Find the page from the underlying object. 374 */ 375 if (object) { 376 sf = vm_imgact_map_page(object, offset); 377 if (sf == NULL) 378 return (KERN_FAILURE); 379 off = offset - trunc_page(offset); 380 error = copyout((caddr_t)sf_buf_kva(sf) + off, (caddr_t)start, 381 end - start); 382 vm_imgact_unmap_page(sf); 383 if (error) { 384 return (KERN_FAILURE); 385 } 386 } 387 388 return (KERN_SUCCESS); 389 } 390 391 static int 392 __elfN(map_insert)(vm_map_t map, vm_object_t object, vm_ooffset_t offset, 393 vm_offset_t start, vm_offset_t end, vm_prot_t prot, int cow) 394 { 395 struct sf_buf *sf; 396 vm_offset_t off; 397 vm_size_t sz; 398 int error, rv; 399 400 if (start != trunc_page(start)) { 401 rv = __elfN(map_partial)(map, object, offset, start, 402 round_page(start), prot); 403 if (rv) 404 return (rv); 405 offset += round_page(start) - start; 406 start = round_page(start); 407 } 408 if (end != round_page(end)) { 409 rv = __elfN(map_partial)(map, object, offset + 410 trunc_page(end) - start, trunc_page(end), end, prot); 411 if (rv) 412 return (rv); 413 end = trunc_page(end); 414 } 415 if (end > start) { 416 if (offset & PAGE_MASK) { 417 /* 418 * The mapping is not page aligned. This means we have 419 * to copy the data. Sigh. 420 */ 421 rv = vm_map_find(map, NULL, 0, &start, end - start, 422 FALSE, prot | VM_PROT_WRITE, VM_PROT_ALL, 0); 423 if (rv) 424 return (rv); 425 if (object == NULL) 426 return (KERN_SUCCESS); 427 for (; start < end; start += sz) { 428 sf = vm_imgact_map_page(object, offset); 429 if (sf == NULL) 430 return (KERN_FAILURE); 431 off = offset - trunc_page(offset); 432 sz = end - start; 433 if (sz > PAGE_SIZE - off) 434 sz = PAGE_SIZE - off; 435 error = copyout((caddr_t)sf_buf_kva(sf) + off, 436 (caddr_t)start, sz); 437 vm_imgact_unmap_page(sf); 438 if (error) { 439 return (KERN_FAILURE); 440 } 441 offset += sz; 442 } 443 rv = KERN_SUCCESS; 444 } else { 445 vm_object_reference(object); 446 vm_map_lock(map); 447 rv = vm_map_insert(map, object, offset, start, end, 448 prot, VM_PROT_ALL, cow); 449 vm_map_unlock(map); 450 if (rv != KERN_SUCCESS) 451 vm_object_deallocate(object); 452 } 453 return (rv); 454 } else { 455 return (KERN_SUCCESS); 456 } 457 } 458 459 static int 460 __elfN(load_section)(struct vmspace *vmspace, 461 vm_object_t object, vm_offset_t offset, 462 caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot, 463 size_t pagesize) 464 { 465 struct sf_buf *sf; 466 size_t map_len; 467 vm_offset_t map_addr; 468 int error, rv, cow; 469 size_t copy_len; 470 vm_offset_t file_addr; 471 472 /* 473 * It's necessary to fail if the filsz + offset taken from the 474 * header is greater than the actual file pager object's size. 475 * If we were to allow this, then the vm_map_find() below would 476 * walk right off the end of the file object and into the ether. 477 * 478 * While I'm here, might as well check for something else that 479 * is invalid: filsz cannot be greater than memsz. 480 */ 481 if ((off_t)filsz + offset > object->un_pager.vnp.vnp_size || 482 filsz > memsz) { 483 uprintf("elf_load_section: truncated ELF file\n"); 484 return (ENOEXEC); 485 } 486 487 map_addr = trunc_page_ps((vm_offset_t)vmaddr, pagesize); 488 file_addr = trunc_page_ps(offset, pagesize); 489 490 /* 491 * We have two choices. We can either clear the data in the last page 492 * of an oversized mapping, or we can start the anon mapping a page 493 * early and copy the initialized data into that first page. We 494 * choose the second.. 495 */ 496 if (memsz > filsz) 497 map_len = trunc_page_ps(offset + filsz, pagesize) - file_addr; 498 else 499 map_len = round_page_ps(offset + filsz, pagesize) - file_addr; 500 501 if (map_len != 0) { 502 /* cow flags: don't dump readonly sections in core */ 503 cow = MAP_COPY_ON_WRITE | MAP_PREFAULT | 504 (prot & VM_PROT_WRITE ? 0 : MAP_DISABLE_COREDUMP); 505 506 rv = __elfN(map_insert)(&vmspace->vm_map, 507 object, 508 file_addr, /* file offset */ 509 map_addr, /* virtual start */ 510 map_addr + map_len,/* virtual end */ 511 prot, 512 cow); 513 if (rv != KERN_SUCCESS) 514 return (EINVAL); 515 516 /* we can stop now if we've covered it all */ 517 if (memsz == filsz) { 518 return (0); 519 } 520 } 521 522 523 /* 524 * We have to get the remaining bit of the file into the first part 525 * of the oversized map segment. This is normally because the .data 526 * segment in the file is extended to provide bss. It's a neat idea 527 * to try and save a page, but it's a pain in the behind to implement. 528 */ 529 copy_len = (offset + filsz) - trunc_page_ps(offset + filsz, pagesize); 530 map_addr = trunc_page_ps((vm_offset_t)vmaddr + filsz, pagesize); 531 map_len = round_page_ps((vm_offset_t)vmaddr + memsz, pagesize) - 532 map_addr; 533 534 /* This had damn well better be true! */ 535 if (map_len != 0) { 536 rv = __elfN(map_insert)(&vmspace->vm_map, NULL, 0, map_addr, 537 map_addr + map_len, VM_PROT_ALL, 0); 538 if (rv != KERN_SUCCESS) { 539 return (EINVAL); 540 } 541 } 542 543 if (copy_len != 0) { 544 vm_offset_t off; 545 546 sf = vm_imgact_map_page(object, offset + filsz); 547 if (sf == NULL) 548 return (EIO); 549 550 /* send the page fragment to user space */ 551 off = trunc_page_ps(offset + filsz, pagesize) - 552 trunc_page(offset + filsz); 553 error = copyout((caddr_t)sf_buf_kva(sf) + off, 554 (caddr_t)map_addr, copy_len); 555 vm_imgact_unmap_page(sf); 556 if (error) { 557 return (error); 558 } 559 } 560 561 /* 562 * set it to the specified protection. 563 * XXX had better undo the damage from pasting over the cracks here! 564 */ 565 vm_map_protect(&vmspace->vm_map, trunc_page(map_addr), 566 round_page(map_addr + map_len), prot, FALSE); 567 568 return (0); 569 } 570 571 /* 572 * Load the file "file" into memory. It may be either a shared object 573 * or an executable. 574 * 575 * The "addr" reference parameter is in/out. On entry, it specifies 576 * the address where a shared object should be loaded. If the file is 577 * an executable, this value is ignored. On exit, "addr" specifies 578 * where the file was actually loaded. 579 * 580 * The "entry" reference parameter is out only. On exit, it specifies 581 * the entry point for the loaded file. 582 */ 583 static int 584 __elfN(load_file)(struct proc *p, const char *file, u_long *addr, 585 u_long *entry, size_t pagesize) 586 { 587 struct { 588 struct nameidata nd; 589 struct vattr attr; 590 struct image_params image_params; 591 } *tempdata; 592 const Elf_Ehdr *hdr = NULL; 593 const Elf_Phdr *phdr = NULL; 594 struct nameidata *nd; 595 struct vmspace *vmspace = p->p_vmspace; 596 struct vattr *attr; 597 struct image_params *imgp; 598 vm_prot_t prot; 599 u_long rbase; 600 u_long base_addr = 0; 601 int vfslocked, error, i, numsegs; 602 603 #ifdef CAPABILITY_MODE 604 /* 605 * XXXJA: This check can go away once we are sufficiently confident 606 * that the checks in namei() are correct. 607 */ 608 if (IN_CAPABILITY_MODE(curthread)) 609 return (ECAPMODE); 610 #endif 611 612 tempdata = malloc(sizeof(*tempdata), M_TEMP, M_WAITOK); 613 nd = &tempdata->nd; 614 attr = &tempdata->attr; 615 imgp = &tempdata->image_params; 616 617 /* 618 * Initialize part of the common data 619 */ 620 imgp->proc = p; 621 imgp->attr = attr; 622 imgp->firstpage = NULL; 623 imgp->image_header = NULL; 624 imgp->object = NULL; 625 imgp->execlabel = NULL; 626 627 NDINIT(nd, LOOKUP, MPSAFE|LOCKLEAF|FOLLOW, UIO_SYSSPACE, file, 628 curthread); 629 vfslocked = 0; 630 if ((error = namei(nd)) != 0) { 631 nd->ni_vp = NULL; 632 goto fail; 633 } 634 vfslocked = NDHASGIANT(nd); 635 NDFREE(nd, NDF_ONLY_PNBUF); 636 imgp->vp = nd->ni_vp; 637 638 /* 639 * Check permissions, modes, uid, etc on the file, and "open" it. 640 */ 641 error = exec_check_permissions(imgp); 642 if (error) 643 goto fail; 644 645 error = exec_map_first_page(imgp); 646 if (error) 647 goto fail; 648 649 /* 650 * Also make certain that the interpreter stays the same, so set 651 * its VV_TEXT flag, too. 652 */ 653 VOP_SET_TEXT(nd->ni_vp); 654 655 imgp->object = nd->ni_vp->v_object; 656 657 hdr = (const Elf_Ehdr *)imgp->image_header; 658 if ((error = __elfN(check_header)(hdr)) != 0) 659 goto fail; 660 if (hdr->e_type == ET_DYN) 661 rbase = *addr; 662 else if (hdr->e_type == ET_EXEC) 663 rbase = 0; 664 else { 665 error = ENOEXEC; 666 goto fail; 667 } 668 669 /* Only support headers that fit within first page for now */ 670 if ((hdr->e_phoff > PAGE_SIZE) || 671 (u_int)hdr->e_phentsize * hdr->e_phnum > PAGE_SIZE - hdr->e_phoff) { 672 error = ENOEXEC; 673 goto fail; 674 } 675 676 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 677 if (!aligned(phdr, Elf_Addr)) { 678 error = ENOEXEC; 679 goto fail; 680 } 681 682 for (i = 0, numsegs = 0; i < hdr->e_phnum; i++) { 683 if (phdr[i].p_type == PT_LOAD && phdr[i].p_memsz != 0) { 684 /* Loadable segment */ 685 prot = __elfN(trans_prot)(phdr[i].p_flags); 686 if ((error = __elfN(load_section)(vmspace, 687 imgp->object, phdr[i].p_offset, 688 (caddr_t)(uintptr_t)phdr[i].p_vaddr + rbase, 689 phdr[i].p_memsz, phdr[i].p_filesz, prot, 690 pagesize)) != 0) 691 goto fail; 692 /* 693 * Establish the base address if this is the 694 * first segment. 695 */ 696 if (numsegs == 0) 697 base_addr = trunc_page(phdr[i].p_vaddr + 698 rbase); 699 numsegs++; 700 } 701 } 702 *addr = base_addr; 703 *entry = (unsigned long)hdr->e_entry + rbase; 704 705 fail: 706 if (imgp->firstpage) 707 exec_unmap_first_page(imgp); 708 709 if (nd->ni_vp) 710 vput(nd->ni_vp); 711 712 VFS_UNLOCK_GIANT(vfslocked); 713 free(tempdata, M_TEMP); 714 715 return (error); 716 } 717 718 static int 719 __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp) 720 { 721 const Elf_Ehdr *hdr = (const Elf_Ehdr *)imgp->image_header; 722 const Elf_Phdr *phdr; 723 Elf_Auxargs *elf_auxargs; 724 struct vmspace *vmspace; 725 vm_prot_t prot; 726 u_long text_size = 0, data_size = 0, total_size = 0; 727 u_long text_addr = 0, data_addr = 0; 728 u_long seg_size, seg_addr; 729 u_long addr, baddr, et_dyn_addr, entry = 0, proghdr = 0; 730 int32_t osrel = 0; 731 int error = 0, i, n, interp_name_len = 0; 732 const char *interp = NULL, *newinterp = NULL; 733 Elf_Brandinfo *brand_info; 734 char *path; 735 struct sysentvec *sv; 736 737 /* 738 * Do we have a valid ELF header ? 739 * 740 * Only allow ET_EXEC & ET_DYN here, reject ET_DYN later 741 * if particular brand doesn't support it. 742 */ 743 if (__elfN(check_header)(hdr) != 0 || 744 (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN)) 745 return (-1); 746 747 /* 748 * From here on down, we return an errno, not -1, as we've 749 * detected an ELF file. 750 */ 751 752 if ((hdr->e_phoff > PAGE_SIZE) || 753 (u_int)hdr->e_phentsize * hdr->e_phnum > PAGE_SIZE - hdr->e_phoff) { 754 /* Only support headers in first page for now */ 755 return (ENOEXEC); 756 } 757 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 758 if (!aligned(phdr, Elf_Addr)) 759 return (ENOEXEC); 760 n = 0; 761 baddr = 0; 762 for (i = 0; i < hdr->e_phnum; i++) { 763 switch (phdr[i].p_type) { 764 case PT_LOAD: 765 if (n == 0) 766 baddr = phdr[i].p_vaddr; 767 n++; 768 break; 769 case PT_INTERP: 770 /* Path to interpreter */ 771 if (phdr[i].p_filesz > MAXPATHLEN || 772 phdr[i].p_offset > PAGE_SIZE || 773 phdr[i].p_filesz > PAGE_SIZE - phdr[i].p_offset) 774 return (ENOEXEC); 775 interp = imgp->image_header + phdr[i].p_offset; 776 interp_name_len = phdr[i].p_filesz; 777 break; 778 case PT_GNU_STACK: 779 if (__elfN(nxstack)) 780 imgp->stack_prot = 781 __elfN(trans_prot)(phdr[i].p_flags); 782 break; 783 } 784 } 785 786 brand_info = __elfN(get_brandinfo)(imgp, interp, interp_name_len, 787 &osrel); 788 if (brand_info == NULL) { 789 uprintf("ELF binary type \"%u\" not known.\n", 790 hdr->e_ident[EI_OSABI]); 791 return (ENOEXEC); 792 } 793 if (hdr->e_type == ET_DYN) { 794 if ((brand_info->flags & BI_CAN_EXEC_DYN) == 0) 795 return (ENOEXEC); 796 /* 797 * Honour the base load address from the dso if it is 798 * non-zero for some reason. 799 */ 800 if (baddr == 0) 801 et_dyn_addr = ET_DYN_LOAD_ADDR; 802 else 803 et_dyn_addr = 0; 804 } else 805 et_dyn_addr = 0; 806 sv = brand_info->sysvec; 807 if (interp != NULL && brand_info->interp_newpath != NULL) 808 newinterp = brand_info->interp_newpath; 809 810 /* 811 * Avoid a possible deadlock if the current address space is destroyed 812 * and that address space maps the locked vnode. In the common case, 813 * the locked vnode's v_usecount is decremented but remains greater 814 * than zero. Consequently, the vnode lock is not needed by vrele(). 815 * However, in cases where the vnode lock is external, such as nullfs, 816 * v_usecount may become zero. 817 */ 818 VOP_UNLOCK(imgp->vp, 0); 819 820 error = exec_new_vmspace(imgp, sv); 821 imgp->proc->p_sysent = sv; 822 823 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY); 824 if (error) 825 return (error); 826 827 vmspace = imgp->proc->p_vmspace; 828 829 for (i = 0; i < hdr->e_phnum; i++) { 830 switch (phdr[i].p_type) { 831 case PT_LOAD: /* Loadable segment */ 832 if (phdr[i].p_memsz == 0) 833 break; 834 prot = __elfN(trans_prot)(phdr[i].p_flags); 835 if ((error = __elfN(load_section)(vmspace, 836 imgp->object, phdr[i].p_offset, 837 (caddr_t)(uintptr_t)phdr[i].p_vaddr + et_dyn_addr, 838 phdr[i].p_memsz, phdr[i].p_filesz, prot, 839 sv->sv_pagesize)) != 0) 840 return (error); 841 842 /* 843 * If this segment contains the program headers, 844 * remember their virtual address for the AT_PHDR 845 * aux entry. Static binaries don't usually include 846 * a PT_PHDR entry. 847 */ 848 if (phdr[i].p_offset == 0 && 849 hdr->e_phoff + hdr->e_phnum * hdr->e_phentsize 850 <= phdr[i].p_filesz) 851 proghdr = phdr[i].p_vaddr + hdr->e_phoff + 852 et_dyn_addr; 853 854 seg_addr = trunc_page(phdr[i].p_vaddr + et_dyn_addr); 855 seg_size = round_page(phdr[i].p_memsz + 856 phdr[i].p_vaddr + et_dyn_addr - seg_addr); 857 858 /* 859 * Make the largest executable segment the official 860 * text segment and all others data. 861 * 862 * Note that obreak() assumes that data_addr + 863 * data_size == end of data load area, and the ELF 864 * file format expects segments to be sorted by 865 * address. If multiple data segments exist, the 866 * last one will be used. 867 */ 868 869 if (phdr[i].p_flags & PF_X && text_size < seg_size) { 870 text_size = seg_size; 871 text_addr = seg_addr; 872 } else { 873 data_size = seg_size; 874 data_addr = seg_addr; 875 } 876 total_size += seg_size; 877 break; 878 case PT_PHDR: /* Program header table info */ 879 proghdr = phdr[i].p_vaddr + et_dyn_addr; 880 break; 881 default: 882 break; 883 } 884 } 885 886 if (data_addr == 0 && data_size == 0) { 887 data_addr = text_addr; 888 data_size = text_size; 889 } 890 891 entry = (u_long)hdr->e_entry + et_dyn_addr; 892 893 /* 894 * Check limits. It should be safe to check the 895 * limits after loading the segments since we do 896 * not actually fault in all the segments pages. 897 */ 898 PROC_LOCK(imgp->proc); 899 if (data_size > lim_cur(imgp->proc, RLIMIT_DATA) || 900 text_size > maxtsiz || 901 total_size > lim_cur(imgp->proc, RLIMIT_VMEM) || 902 racct_set(imgp->proc, RACCT_DATA, data_size) != 0 || 903 racct_set(imgp->proc, RACCT_VMEM, total_size) != 0) { 904 PROC_UNLOCK(imgp->proc); 905 return (ENOMEM); 906 } 907 908 vmspace->vm_tsize = text_size >> PAGE_SHIFT; 909 vmspace->vm_taddr = (caddr_t)(uintptr_t)text_addr; 910 vmspace->vm_dsize = data_size >> PAGE_SHIFT; 911 vmspace->vm_daddr = (caddr_t)(uintptr_t)data_addr; 912 913 /* 914 * We load the dynamic linker where a userland call 915 * to mmap(0, ...) would put it. The rationale behind this 916 * calculation is that it leaves room for the heap to grow to 917 * its maximum allowed size. 918 */ 919 addr = round_page((vm_offset_t)imgp->proc->p_vmspace->vm_daddr + 920 lim_max(imgp->proc, RLIMIT_DATA)); 921 PROC_UNLOCK(imgp->proc); 922 923 imgp->entry_addr = entry; 924 925 if (interp != NULL) { 926 int have_interp = FALSE; 927 VOP_UNLOCK(imgp->vp, 0); 928 if (brand_info->emul_path != NULL && 929 brand_info->emul_path[0] != '\0') { 930 path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 931 snprintf(path, MAXPATHLEN, "%s%s", 932 brand_info->emul_path, interp); 933 error = __elfN(load_file)(imgp->proc, path, &addr, 934 &imgp->entry_addr, sv->sv_pagesize); 935 free(path, M_TEMP); 936 if (error == 0) 937 have_interp = TRUE; 938 } 939 if (!have_interp && newinterp != NULL) { 940 error = __elfN(load_file)(imgp->proc, newinterp, &addr, 941 &imgp->entry_addr, sv->sv_pagesize); 942 if (error == 0) 943 have_interp = TRUE; 944 } 945 if (!have_interp) { 946 error = __elfN(load_file)(imgp->proc, interp, &addr, 947 &imgp->entry_addr, sv->sv_pagesize); 948 } 949 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY); 950 if (error != 0) { 951 uprintf("ELF interpreter %s not found\n", interp); 952 return (error); 953 } 954 } else 955 addr = et_dyn_addr; 956 957 /* 958 * Construct auxargs table (used by the fixup routine) 959 */ 960 elf_auxargs = malloc(sizeof(Elf_Auxargs), M_TEMP, M_WAITOK); 961 elf_auxargs->execfd = -1; 962 elf_auxargs->phdr = proghdr; 963 elf_auxargs->phent = hdr->e_phentsize; 964 elf_auxargs->phnum = hdr->e_phnum; 965 elf_auxargs->pagesz = PAGE_SIZE; 966 elf_auxargs->base = addr; 967 elf_auxargs->flags = 0; 968 elf_auxargs->entry = entry; 969 970 imgp->auxargs = elf_auxargs; 971 imgp->interpreted = 0; 972 imgp->reloc_base = addr; 973 imgp->proc->p_osrel = osrel; 974 975 return (error); 976 } 977 978 #define suword __CONCAT(suword, __ELF_WORD_SIZE) 979 980 int 981 __elfN(freebsd_fixup)(register_t **stack_base, struct image_params *imgp) 982 { 983 Elf_Auxargs *args = (Elf_Auxargs *)imgp->auxargs; 984 Elf_Addr *base; 985 Elf_Addr *pos; 986 987 base = (Elf_Addr *)*stack_base; 988 pos = base + (imgp->args->argc + imgp->args->envc + 2); 989 990 if (args->execfd != -1) 991 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd); 992 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr); 993 AUXARGS_ENTRY(pos, AT_PHENT, args->phent); 994 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum); 995 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz); 996 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags); 997 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry); 998 AUXARGS_ENTRY(pos, AT_BASE, args->base); 999 if (imgp->execpathp != 0) 1000 AUXARGS_ENTRY(pos, AT_EXECPATH, imgp->execpathp); 1001 AUXARGS_ENTRY(pos, AT_OSRELDATE, osreldate); 1002 if (imgp->canary != 0) { 1003 AUXARGS_ENTRY(pos, AT_CANARY, imgp->canary); 1004 AUXARGS_ENTRY(pos, AT_CANARYLEN, imgp->canarylen); 1005 } 1006 AUXARGS_ENTRY(pos, AT_NCPUS, mp_ncpus); 1007 if (imgp->pagesizes != 0) { 1008 AUXARGS_ENTRY(pos, AT_PAGESIZES, imgp->pagesizes); 1009 AUXARGS_ENTRY(pos, AT_PAGESIZESLEN, imgp->pagesizeslen); 1010 } 1011 if (imgp->sysent->sv_timekeep_base != 0) { 1012 AUXARGS_ENTRY(pos, AT_TIMEKEEP, 1013 imgp->sysent->sv_timekeep_base); 1014 } 1015 AUXARGS_ENTRY(pos, AT_STACKPROT, imgp->sysent->sv_shared_page_obj 1016 != NULL && imgp->stack_prot != 0 ? imgp->stack_prot : 1017 imgp->sysent->sv_stackprot); 1018 AUXARGS_ENTRY(pos, AT_NULL, 0); 1019 1020 free(imgp->auxargs, M_TEMP); 1021 imgp->auxargs = NULL; 1022 1023 base--; 1024 suword(base, (long)imgp->args->argc); 1025 *stack_base = (register_t *)base; 1026 return (0); 1027 } 1028 1029 /* 1030 * Code for generating ELF core dumps. 1031 */ 1032 1033 typedef void (*segment_callback)(vm_map_entry_t, void *); 1034 1035 /* Closure for cb_put_phdr(). */ 1036 struct phdr_closure { 1037 Elf_Phdr *phdr; /* Program header to fill in */ 1038 Elf_Off offset; /* Offset of segment in core file */ 1039 }; 1040 1041 /* Closure for cb_size_segment(). */ 1042 struct sseg_closure { 1043 int count; /* Count of writable segments. */ 1044 size_t size; /* Total size of all writable segments. */ 1045 }; 1046 1047 typedef void (*outfunc_t)(void *, struct sbuf *, size_t *); 1048 1049 struct note_info { 1050 int type; /* Note type. */ 1051 outfunc_t outfunc; /* Output function. */ 1052 void *outarg; /* Argument for the output function. */ 1053 size_t outsize; /* Output size. */ 1054 TAILQ_ENTRY(note_info) link; /* Link to the next note info. */ 1055 }; 1056 1057 TAILQ_HEAD(note_info_list, note_info); 1058 1059 static void cb_put_phdr(vm_map_entry_t, void *); 1060 static void cb_size_segment(vm_map_entry_t, void *); 1061 static void each_writable_segment(struct thread *, segment_callback, void *); 1062 static int __elfN(corehdr)(struct thread *, struct vnode *, struct ucred *, 1063 int, void *, size_t, struct note_info_list *, size_t, gzFile); 1064 static void __elfN(prepare_notes)(struct thread *, struct note_info_list *, 1065 size_t *); 1066 static void __elfN(puthdr)(struct thread *, void *, size_t, int, size_t); 1067 static void __elfN(putnote)(struct note_info *, struct sbuf *); 1068 static size_t register_note(struct note_info_list *, int, outfunc_t, void *); 1069 static int sbuf_drain_core_output(void *, const char *, int); 1070 static int sbuf_drain_count(void *arg, const char *data, int len); 1071 1072 static void __elfN(note_fpregset)(void *, struct sbuf *, size_t *); 1073 static void __elfN(note_prpsinfo)(void *, struct sbuf *, size_t *); 1074 static void __elfN(note_prstatus)(void *, struct sbuf *, size_t *); 1075 static void __elfN(note_threadmd)(void *, struct sbuf *, size_t *); 1076 static void __elfN(note_thrmisc)(void *, struct sbuf *, size_t *); 1077 static void __elfN(note_procstat_auxv)(void *, struct sbuf *, size_t *); 1078 static void __elfN(note_procstat_proc)(void *, struct sbuf *, size_t *); 1079 static void __elfN(note_procstat_psstrings)(void *, struct sbuf *, size_t *); 1080 static void note_procstat_files(void *, struct sbuf *, size_t *); 1081 static void note_procstat_groups(void *, struct sbuf *, size_t *); 1082 static void note_procstat_osrel(void *, struct sbuf *, size_t *); 1083 static void note_procstat_rlimit(void *, struct sbuf *, size_t *); 1084 static void note_procstat_umask(void *, struct sbuf *, size_t *); 1085 static void note_procstat_vmmap(void *, struct sbuf *, size_t *); 1086 1087 #ifdef COMPRESS_USER_CORES 1088 extern int compress_user_cores; 1089 extern int compress_user_cores_gzlevel; 1090 #endif 1091 1092 static int 1093 core_output(struct vnode *vp, void *base, size_t len, off_t offset, 1094 struct ucred *active_cred, struct ucred *file_cred, 1095 struct thread *td, char *core_buf, gzFile gzfile) { 1096 1097 int error; 1098 if (gzfile) { 1099 #ifdef COMPRESS_USER_CORES 1100 error = compress_core(gzfile, base, core_buf, len, td); 1101 #else 1102 panic("shouldn't be here"); 1103 #endif 1104 } else { 1105 error = vn_rdwr_inchunks(UIO_WRITE, vp, base, len, offset, 1106 UIO_USERSPACE, IO_UNIT | IO_DIRECT, active_cred, file_cred, 1107 NULL, td); 1108 } 1109 return (error); 1110 } 1111 1112 /* Coredump output parameters for sbuf drain routine. */ 1113 struct sbuf_drain_core_params { 1114 off_t offset; 1115 struct ucred *active_cred; 1116 struct ucred *file_cred; 1117 struct thread *td; 1118 struct vnode *vp; 1119 #ifdef COMPRESS_USER_CORES 1120 gzFile gzfile; 1121 #endif 1122 }; 1123 1124 /* 1125 * Drain into a core file. 1126 */ 1127 static int 1128 sbuf_drain_core_output(void *arg, const char *data, int len) 1129 { 1130 struct sbuf_drain_core_params *p; 1131 int error, locked; 1132 1133 p = (struct sbuf_drain_core_params *)arg; 1134 1135 /* 1136 * Some kern_proc out routines that print to this sbuf may 1137 * call us with the process lock held. Draining with the 1138 * non-sleepable lock held is unsafe. The lock is needed for 1139 * those routines when dumping a live process. In our case we 1140 * can safely release the lock before draining and acquire 1141 * again after. 1142 */ 1143 locked = PROC_LOCKED(p->td->td_proc); 1144 if (locked) 1145 PROC_UNLOCK(p->td->td_proc); 1146 #ifdef COMPRESS_USER_CORES 1147 if (p->gzfile != Z_NULL) 1148 error = compress_core(p->gzfile, NULL, __DECONST(char *, data), 1149 len, p->td); 1150 else 1151 #endif 1152 error = vn_rdwr_inchunks(UIO_WRITE, p->vp, 1153 __DECONST(void *, data), len, p->offset, UIO_SYSSPACE, 1154 IO_UNIT | IO_DIRECT, p->active_cred, p->file_cred, NULL, 1155 p->td); 1156 if (locked) 1157 PROC_LOCK(p->td->td_proc); 1158 if (error != 0) 1159 return (-error); 1160 p->offset += len; 1161 return (len); 1162 } 1163 1164 /* 1165 * Drain into a counter. 1166 */ 1167 static int 1168 sbuf_drain_count(void *arg, const char *data __unused, int len) 1169 { 1170 size_t *sizep; 1171 1172 sizep = (size_t *)arg; 1173 *sizep += len; 1174 return (len); 1175 } 1176 1177 int 1178 __elfN(coredump)(struct thread *td, struct vnode *vp, off_t limit, int flags) 1179 { 1180 struct ucred *cred = td->td_ucred; 1181 int error = 0; 1182 struct sseg_closure seginfo; 1183 struct note_info_list notelst; 1184 struct note_info *ninfo; 1185 void *hdr; 1186 size_t hdrsize, notesz, coresize; 1187 1188 gzFile gzfile = Z_NULL; 1189 char *core_buf = NULL; 1190 #ifdef COMPRESS_USER_CORES 1191 char gzopen_flags[8]; 1192 char *p; 1193 int doing_compress = flags & IMGACT_CORE_COMPRESS; 1194 #endif 1195 1196 hdr = NULL; 1197 TAILQ_INIT(¬elst); 1198 1199 #ifdef COMPRESS_USER_CORES 1200 if (doing_compress) { 1201 p = gzopen_flags; 1202 *p++ = 'w'; 1203 if (compress_user_cores_gzlevel >= 0 && 1204 compress_user_cores_gzlevel <= 9) 1205 *p++ = '' + compress_user_cores_gzlevel; 1206 *p = 0; 1207 gzfile = gz_open("", gzopen_flags, vp); 1208 if (gzfile == Z_NULL) { 1209 error = EFAULT; 1210 goto done; 1211 } 1212 core_buf = malloc(CORE_BUF_SIZE, M_TEMP, M_WAITOK | M_ZERO); 1213 if (!core_buf) { 1214 error = ENOMEM; 1215 goto done; 1216 } 1217 } 1218 #endif 1219 1220 /* Size the program segments. */ 1221 seginfo.count = 0; 1222 seginfo.size = 0; 1223 each_writable_segment(td, cb_size_segment, &seginfo); 1224 1225 /* 1226 * Collect info about the core file header area. 1227 */ 1228 hdrsize = sizeof(Elf_Ehdr) + sizeof(Elf_Phdr) * (1 + seginfo.count); 1229 __elfN(prepare_notes)(td, ¬elst, ¬esz); 1230 coresize = round_page(hdrsize + notesz) + seginfo.size; 1231 1232 #ifdef RACCT 1233 PROC_LOCK(td->td_proc); 1234 error = racct_add(td->td_proc, RACCT_CORE, coresize); 1235 PROC_UNLOCK(td->td_proc); 1236 if (error != 0) { 1237 error = EFAULT; 1238 goto done; 1239 } 1240 #endif 1241 if (coresize >= limit) { 1242 error = EFAULT; 1243 goto done; 1244 } 1245 1246 /* 1247 * Allocate memory for building the header, fill it up, 1248 * and write it out following the notes. 1249 */ 1250 hdr = malloc(hdrsize, M_TEMP, M_WAITOK); 1251 if (hdr == NULL) { 1252 error = EINVAL; 1253 goto done; 1254 } 1255 error = __elfN(corehdr)(td, vp, cred, seginfo.count, hdr, hdrsize, 1256 ¬elst, notesz, gzfile); 1257 1258 /* Write the contents of all of the writable segments. */ 1259 if (error == 0) { 1260 Elf_Phdr *php; 1261 off_t offset; 1262 int i; 1263 1264 php = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr)) + 1; 1265 offset = round_page(hdrsize + notesz); 1266 for (i = 0; i < seginfo.count; i++) { 1267 error = core_output(vp, (caddr_t)(uintptr_t)php->p_vaddr, 1268 php->p_filesz, offset, cred, NOCRED, curthread, core_buf, gzfile); 1269 if (error != 0) 1270 break; 1271 offset += php->p_filesz; 1272 php++; 1273 } 1274 } 1275 if (error) { 1276 log(LOG_WARNING, 1277 "Failed to write core file for process %s (error %d)\n", 1278 curproc->p_comm, error); 1279 } 1280 1281 done: 1282 #ifdef COMPRESS_USER_CORES 1283 if (core_buf) 1284 free(core_buf, M_TEMP); 1285 if (gzfile) 1286 gzclose(gzfile); 1287 #endif 1288 while ((ninfo = TAILQ_FIRST(¬elst)) != NULL) { 1289 TAILQ_REMOVE(¬elst, ninfo, link); 1290 free(ninfo, M_TEMP); 1291 } 1292 if (hdr != NULL) 1293 free(hdr, M_TEMP); 1294 1295 return (error); 1296 } 1297 1298 /* 1299 * A callback for each_writable_segment() to write out the segment's 1300 * program header entry. 1301 */ 1302 static void 1303 cb_put_phdr(entry, closure) 1304 vm_map_entry_t entry; 1305 void *closure; 1306 { 1307 struct phdr_closure *phc = (struct phdr_closure *)closure; 1308 Elf_Phdr *phdr = phc->phdr; 1309 1310 phc->offset = round_page(phc->offset); 1311 1312 phdr->p_type = PT_LOAD; 1313 phdr->p_offset = phc->offset; 1314 phdr->p_vaddr = entry->start; 1315 phdr->p_paddr = 0; 1316 phdr->p_filesz = phdr->p_memsz = entry->end - entry->start; 1317 phdr->p_align = PAGE_SIZE; 1318 phdr->p_flags = __elfN(untrans_prot)(entry->protection); 1319 1320 phc->offset += phdr->p_filesz; 1321 phc->phdr++; 1322 } 1323 1324 /* 1325 * A callback for each_writable_segment() to gather information about 1326 * the number of segments and their total size. 1327 */ 1328 static void 1329 cb_size_segment(entry, closure) 1330 vm_map_entry_t entry; 1331 void *closure; 1332 { 1333 struct sseg_closure *ssc = (struct sseg_closure *)closure; 1334 1335 ssc->count++; 1336 ssc->size += entry->end - entry->start; 1337 } 1338 1339 /* 1340 * For each writable segment in the process's memory map, call the given 1341 * function with a pointer to the map entry and some arbitrary 1342 * caller-supplied data. 1343 */ 1344 static void 1345 each_writable_segment(td, func, closure) 1346 struct thread *td; 1347 segment_callback func; 1348 void *closure; 1349 { 1350 struct proc *p = td->td_proc; 1351 vm_map_t map = &p->p_vmspace->vm_map; 1352 vm_map_entry_t entry; 1353 vm_object_t backing_object, object; 1354 boolean_t ignore_entry; 1355 1356 vm_map_lock_read(map); 1357 for (entry = map->header.next; entry != &map->header; 1358 entry = entry->next) { 1359 /* 1360 * Don't dump inaccessible mappings, deal with legacy 1361 * coredump mode. 1362 * 1363 * Note that read-only segments related to the elf binary 1364 * are marked MAP_ENTRY_NOCOREDUMP now so we no longer 1365 * need to arbitrarily ignore such segments. 1366 */ 1367 if (elf_legacy_coredump) { 1368 if ((entry->protection & VM_PROT_RW) != VM_PROT_RW) 1369 continue; 1370 } else { 1371 if ((entry->protection & VM_PROT_ALL) == 0) 1372 continue; 1373 } 1374 1375 /* 1376 * Dont include memory segment in the coredump if 1377 * MAP_NOCORE is set in mmap(2) or MADV_NOCORE in 1378 * madvise(2). Do not dump submaps (i.e. parts of the 1379 * kernel map). 1380 */ 1381 if (entry->eflags & (MAP_ENTRY_NOCOREDUMP|MAP_ENTRY_IS_SUB_MAP)) 1382 continue; 1383 1384 if ((object = entry->object.vm_object) == NULL) 1385 continue; 1386 1387 /* Ignore memory-mapped devices and such things. */ 1388 VM_OBJECT_LOCK(object); 1389 while ((backing_object = object->backing_object) != NULL) { 1390 VM_OBJECT_LOCK(backing_object); 1391 VM_OBJECT_UNLOCK(object); 1392 object = backing_object; 1393 } 1394 ignore_entry = object->type != OBJT_DEFAULT && 1395 object->type != OBJT_SWAP && object->type != OBJT_VNODE && 1396 object->type != OBJT_PHYS; 1397 VM_OBJECT_UNLOCK(object); 1398 if (ignore_entry) 1399 continue; 1400 1401 (*func)(entry, closure); 1402 } 1403 vm_map_unlock_read(map); 1404 } 1405 1406 /* 1407 * Write the core file header to the file, including padding up to 1408 * the page boundary. 1409 */ 1410 static int 1411 __elfN(corehdr)(struct thread *td, struct vnode *vp, struct ucred *cred, 1412 int numsegs, void *hdr, size_t hdrsize, struct note_info_list *notelst, 1413 size_t notesz, gzFile gzfile) 1414 { 1415 struct sbuf_drain_core_params params; 1416 struct note_info *ninfo; 1417 struct sbuf *sb; 1418 int error; 1419 1420 /* Fill in the header. */ 1421 bzero(hdr, hdrsize); 1422 __elfN(puthdr)(td, hdr, hdrsize, numsegs, notesz); 1423 1424 params.offset = 0; 1425 params.active_cred = cred; 1426 params.file_cred = NOCRED; 1427 params.td = td; 1428 params.vp = vp; 1429 #ifdef COMPRESS_USER_CORES 1430 params.gzfile = gzfile; 1431 #endif 1432 sb = sbuf_new(NULL, NULL, CORE_BUF_SIZE, SBUF_FIXEDLEN); 1433 sbuf_set_drain(sb, sbuf_drain_core_output, ¶ms); 1434 sbuf_start_section(sb, NULL); 1435 sbuf_bcat(sb, hdr, hdrsize); 1436 TAILQ_FOREACH(ninfo, notelst, link) 1437 __elfN(putnote)(ninfo, sb); 1438 /* Align up to a page boundary for the program segments. */ 1439 sbuf_end_section(sb, -1, PAGE_SIZE, 0); 1440 error = sbuf_finish(sb); 1441 sbuf_delete(sb); 1442 1443 return (error); 1444 } 1445 1446 static void 1447 __elfN(prepare_notes)(struct thread *td, struct note_info_list *list, 1448 size_t *sizep) 1449 { 1450 struct proc *p; 1451 struct thread *thr; 1452 size_t size; 1453 1454 p = td->td_proc; 1455 size = 0; 1456 1457 size += register_note(list, NT_PRPSINFO, __elfN(note_prpsinfo), p); 1458 1459 /* 1460 * To have the debugger select the right thread (LWP) as the initial 1461 * thread, we dump the state of the thread passed to us in td first. 1462 * This is the thread that causes the core dump and thus likely to 1463 * be the right thread one wants to have selected in the debugger. 1464 */ 1465 thr = td; 1466 while (thr != NULL) { 1467 size += register_note(list, NT_PRSTATUS, 1468 __elfN(note_prstatus), thr); 1469 size += register_note(list, NT_FPREGSET, 1470 __elfN(note_fpregset), thr); 1471 size += register_note(list, NT_THRMISC, 1472 __elfN(note_thrmisc), thr); 1473 size += register_note(list, -1, 1474 __elfN(note_threadmd), thr); 1475 1476 thr = (thr == td) ? TAILQ_FIRST(&p->p_threads) : 1477 TAILQ_NEXT(thr, td_plist); 1478 if (thr == td) 1479 thr = TAILQ_NEXT(thr, td_plist); 1480 } 1481 1482 size += register_note(list, NT_PROCSTAT_PROC, 1483 __elfN(note_procstat_proc), p); 1484 size += register_note(list, NT_PROCSTAT_FILES, 1485 note_procstat_files, p); 1486 size += register_note(list, NT_PROCSTAT_VMMAP, 1487 note_procstat_vmmap, p); 1488 size += register_note(list, NT_PROCSTAT_GROUPS, 1489 note_procstat_groups, p); 1490 size += register_note(list, NT_PROCSTAT_UMASK, 1491 note_procstat_umask, p); 1492 size += register_note(list, NT_PROCSTAT_RLIMIT, 1493 note_procstat_rlimit, p); 1494 size += register_note(list, NT_PROCSTAT_OSREL, 1495 note_procstat_osrel, p); 1496 size += register_note(list, NT_PROCSTAT_PSSTRINGS, 1497 __elfN(note_procstat_psstrings), p); 1498 size += register_note(list, NT_PROCSTAT_AUXV, 1499 __elfN(note_procstat_auxv), p); 1500 1501 *sizep = size; 1502 } 1503 1504 static void 1505 __elfN(puthdr)(struct thread *td, void *hdr, size_t hdrsize, int numsegs, 1506 size_t notesz) 1507 { 1508 Elf_Ehdr *ehdr; 1509 Elf_Phdr *phdr; 1510 struct phdr_closure phc; 1511 1512 ehdr = (Elf_Ehdr *)hdr; 1513 phdr = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr)); 1514 1515 ehdr->e_ident[EI_MAG0] = ELFMAG0; 1516 ehdr->e_ident[EI_MAG1] = ELFMAG1; 1517 ehdr->e_ident[EI_MAG2] = ELFMAG2; 1518 ehdr->e_ident[EI_MAG3] = ELFMAG3; 1519 ehdr->e_ident[EI_CLASS] = ELF_CLASS; 1520 ehdr->e_ident[EI_DATA] = ELF_DATA; 1521 ehdr->e_ident[EI_VERSION] = EV_CURRENT; 1522 ehdr->e_ident[EI_OSABI] = ELFOSABI_FREEBSD; 1523 ehdr->e_ident[EI_ABIVERSION] = 0; 1524 ehdr->e_ident[EI_PAD] = 0; 1525 ehdr->e_type = ET_CORE; 1526 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 1527 ehdr->e_machine = ELF_ARCH32; 1528 #else 1529 ehdr->e_machine = ELF_ARCH; 1530 #endif 1531 ehdr->e_version = EV_CURRENT; 1532 ehdr->e_entry = 0; 1533 ehdr->e_phoff = sizeof(Elf_Ehdr); 1534 ehdr->e_flags = 0; 1535 ehdr->e_ehsize = sizeof(Elf_Ehdr); 1536 ehdr->e_phentsize = sizeof(Elf_Phdr); 1537 ehdr->e_phnum = numsegs + 1; 1538 ehdr->e_shentsize = sizeof(Elf_Shdr); 1539 ehdr->e_shnum = 0; 1540 ehdr->e_shstrndx = SHN_UNDEF; 1541 1542 /* 1543 * Fill in the program header entries. 1544 */ 1545 1546 /* The note segement. */ 1547 phdr->p_type = PT_NOTE; 1548 phdr->p_offset = hdrsize; 1549 phdr->p_vaddr = 0; 1550 phdr->p_paddr = 0; 1551 phdr->p_filesz = notesz; 1552 phdr->p_memsz = 0; 1553 phdr->p_flags = PF_R; 1554 phdr->p_align = ELF_NOTE_ROUNDSIZE; 1555 phdr++; 1556 1557 /* All the writable segments from the program. */ 1558 phc.phdr = phdr; 1559 phc.offset = round_page(hdrsize + notesz); 1560 each_writable_segment(td, cb_put_phdr, &phc); 1561 } 1562 1563 static size_t 1564 register_note(struct note_info_list *list, int type, outfunc_t out, void *arg) 1565 { 1566 struct note_info *ninfo; 1567 size_t size, notesize; 1568 1569 size = 0; 1570 out(arg, NULL, &size); 1571 ninfo = malloc(sizeof(*ninfo), M_TEMP, M_ZERO | M_WAITOK); 1572 ninfo->type = type; 1573 ninfo->outfunc = out; 1574 ninfo->outarg = arg; 1575 ninfo->outsize = size; 1576 TAILQ_INSERT_TAIL(list, ninfo, link); 1577 1578 if (type == -1) 1579 return (size); 1580 1581 notesize = sizeof(Elf_Note) + /* note header */ 1582 roundup2(8, ELF_NOTE_ROUNDSIZE) + /* note name ("FreeBSD") */ 1583 roundup2(size, ELF_NOTE_ROUNDSIZE); /* note description */ 1584 1585 return (notesize); 1586 } 1587 1588 static void 1589 __elfN(putnote)(struct note_info *ninfo, struct sbuf *sb) 1590 { 1591 Elf_Note note; 1592 ssize_t old_len; 1593 1594 if (ninfo->type == -1) { 1595 ninfo->outfunc(ninfo->outarg, sb, &ninfo->outsize); 1596 return; 1597 } 1598 1599 note.n_namesz = 8; /* strlen("FreeBSD") + 1 */ 1600 note.n_descsz = ninfo->outsize; 1601 note.n_type = ninfo->type; 1602 1603 sbuf_bcat(sb, ¬e, sizeof(note)); 1604 sbuf_start_section(sb, &old_len); 1605 sbuf_bcat(sb, "FreeBSD", note.n_namesz); 1606 sbuf_end_section(sb, old_len, ELF_NOTE_ROUNDSIZE, 0); 1607 if (note.n_descsz == 0) 1608 return; 1609 sbuf_start_section(sb, &old_len); 1610 ninfo->outfunc(ninfo->outarg, sb, &ninfo->outsize); 1611 sbuf_end_section(sb, old_len, ELF_NOTE_ROUNDSIZE, 0); 1612 } 1613 1614 /* 1615 * Miscellaneous note out functions. 1616 */ 1617 1618 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 1619 #include <compat/freebsd32/freebsd32.h> 1620 1621 typedef struct prstatus32 elf_prstatus_t; 1622 typedef struct prpsinfo32 elf_prpsinfo_t; 1623 typedef struct fpreg32 elf_prfpregset_t; 1624 typedef struct fpreg32 elf_fpregset_t; 1625 typedef struct reg32 elf_gregset_t; 1626 typedef struct thrmisc32 elf_thrmisc_t; 1627 #define ELF_KERN_PROC_MASK KERN_PROC_MASK32 1628 typedef struct kinfo_proc32 elf_kinfo_proc_t; 1629 typedef uint32_t elf_ps_strings_t; 1630 #else 1631 typedef prstatus_t elf_prstatus_t; 1632 typedef prpsinfo_t elf_prpsinfo_t; 1633 typedef prfpregset_t elf_prfpregset_t; 1634 typedef prfpregset_t elf_fpregset_t; 1635 typedef gregset_t elf_gregset_t; 1636 typedef thrmisc_t elf_thrmisc_t; 1637 #define ELF_KERN_PROC_MASK 0 1638 typedef struct kinfo_proc elf_kinfo_proc_t; 1639 typedef vm_offset_t elf_ps_strings_t; 1640 #endif 1641 1642 static void 1643 __elfN(note_prpsinfo)(void *arg, struct sbuf *sb, size_t *sizep) 1644 { 1645 struct proc *p; 1646 elf_prpsinfo_t *psinfo; 1647 1648 p = (struct proc *)arg; 1649 if (sb != NULL) { 1650 KASSERT(*sizep == sizeof(*psinfo), ("invalid size")); 1651 psinfo = malloc(sizeof(*psinfo), M_TEMP, M_ZERO | M_WAITOK); 1652 psinfo->pr_version = PRPSINFO_VERSION; 1653 psinfo->pr_psinfosz = sizeof(elf_prpsinfo_t); 1654 strlcpy(psinfo->pr_fname, p->p_comm, sizeof(psinfo->pr_fname)); 1655 /* 1656 * XXX - We don't fill in the command line arguments properly 1657 * yet. 1658 */ 1659 strlcpy(psinfo->pr_psargs, p->p_comm, 1660 sizeof(psinfo->pr_psargs)); 1661 1662 sbuf_bcat(sb, psinfo, sizeof(*psinfo)); 1663 free(psinfo, M_TEMP); 1664 } 1665 *sizep = sizeof(*psinfo); 1666 } 1667 1668 static void 1669 __elfN(note_prstatus)(void *arg, struct sbuf *sb, size_t *sizep) 1670 { 1671 struct thread *td; 1672 elf_prstatus_t *status; 1673 1674 td = (struct thread *)arg; 1675 if (sb != NULL) { 1676 KASSERT(*sizep == sizeof(*status), ("invalid size")); 1677 status = malloc(sizeof(*status), M_TEMP, M_ZERO | M_WAITOK); 1678 status->pr_version = PRSTATUS_VERSION; 1679 status->pr_statussz = sizeof(elf_prstatus_t); 1680 status->pr_gregsetsz = sizeof(elf_gregset_t); 1681 status->pr_fpregsetsz = sizeof(elf_fpregset_t); 1682 status->pr_osreldate = osreldate; 1683 status->pr_cursig = td->td_proc->p_sig; 1684 status->pr_pid = td->td_tid; 1685 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 1686 fill_regs32(td, &status->pr_reg); 1687 #else 1688 fill_regs(td, &status->pr_reg); 1689 #endif 1690 sbuf_bcat(sb, status, sizeof(*status)); 1691 free(status, M_TEMP); 1692 } 1693 *sizep = sizeof(*status); 1694 } 1695 1696 static void 1697 __elfN(note_fpregset)(void *arg, struct sbuf *sb, size_t *sizep) 1698 { 1699 struct thread *td; 1700 elf_prfpregset_t *fpregset; 1701 1702 td = (struct thread *)arg; 1703 if (sb != NULL) { 1704 KASSERT(*sizep == sizeof(*fpregset), ("invalid size")); 1705 fpregset = malloc(sizeof(*fpregset), M_TEMP, M_ZERO | M_WAITOK); 1706 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 1707 fill_fpregs32(td, fpregset); 1708 #else 1709 fill_fpregs(td, fpregset); 1710 #endif 1711 sbuf_bcat(sb, fpregset, sizeof(*fpregset)); 1712 free(fpregset, M_TEMP); 1713 } 1714 *sizep = sizeof(*fpregset); 1715 } 1716 1717 static void 1718 __elfN(note_thrmisc)(void *arg, struct sbuf *sb, size_t *sizep) 1719 { 1720 struct thread *td; 1721 elf_thrmisc_t thrmisc; 1722 1723 td = (struct thread *)arg; 1724 if (sb != NULL) { 1725 KASSERT(*sizep == sizeof(thrmisc), ("invalid size")); 1726 bzero(&thrmisc._pad, sizeof(thrmisc._pad)); 1727 strcpy(thrmisc.pr_tname, td->td_name); 1728 sbuf_bcat(sb, &thrmisc, sizeof(thrmisc)); 1729 } 1730 *sizep = sizeof(thrmisc); 1731 } 1732 1733 /* 1734 * Allow for MD specific notes, as well as any MD 1735 * specific preparations for writing MI notes. 1736 */ 1737 static void 1738 __elfN(note_threadmd)(void *arg, struct sbuf *sb, size_t *sizep) 1739 { 1740 struct thread *td; 1741 void *buf; 1742 size_t size; 1743 1744 td = (struct thread *)arg; 1745 size = *sizep; 1746 if (size != 0 && sb != NULL) 1747 buf = malloc(size, M_TEMP, M_ZERO | M_WAITOK); 1748 else 1749 buf = NULL; 1750 size = 0; 1751 __elfN(dump_thread)(td, buf, &size); 1752 KASSERT(*sizep == size, ("invalid size")); 1753 if (size != 0 && sb != NULL) 1754 sbuf_bcat(sb, buf, size); 1755 free(buf, M_TEMP); 1756 *sizep = size; 1757 } 1758 1759 #ifdef KINFO_PROC_SIZE 1760 CTASSERT(sizeof(struct kinfo_proc) == KINFO_PROC_SIZE); 1761 #endif 1762 1763 static void 1764 __elfN(note_procstat_proc)(void *arg, struct sbuf *sb, size_t *sizep) 1765 { 1766 struct proc *p; 1767 size_t size; 1768 int structsize; 1769 1770 p = (struct proc *)arg; 1771 size = sizeof(structsize) + p->p_numthreads * 1772 sizeof(elf_kinfo_proc_t); 1773 1774 if (sb != NULL) { 1775 KASSERT(*sizep == size, ("invalid size")); 1776 structsize = sizeof(elf_kinfo_proc_t); 1777 sbuf_bcat(sb, &structsize, sizeof(structsize)); 1778 PROC_LOCK(p); 1779 kern_proc_out(p, sb, ELF_KERN_PROC_MASK); 1780 } 1781 *sizep = size; 1782 } 1783 1784 #ifdef KINFO_FILE_SIZE 1785 CTASSERT(sizeof(struct kinfo_file) == KINFO_FILE_SIZE); 1786 #endif 1787 1788 static void 1789 note_procstat_files(void *arg, struct sbuf *sb, size_t *sizep) 1790 { 1791 struct proc *p; 1792 size_t size; 1793 int structsize; 1794 1795 p = (struct proc *)arg; 1796 if (sb == NULL) { 1797 size = 0; 1798 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN); 1799 sbuf_set_drain(sb, sbuf_drain_count, &size); 1800 sbuf_bcat(sb, &structsize, sizeof(structsize)); 1801 PROC_LOCK(p); 1802 kern_proc_filedesc_out(p, sb, -1); 1803 sbuf_finish(sb); 1804 sbuf_delete(sb); 1805 *sizep = size; 1806 } else { 1807 structsize = sizeof(struct kinfo_file); 1808 sbuf_bcat(sb, &structsize, sizeof(structsize)); 1809 PROC_LOCK(p); 1810 kern_proc_filedesc_out(p, sb, -1); 1811 } 1812 } 1813 1814 #ifdef KINFO_VMENTRY_SIZE 1815 CTASSERT(sizeof(struct kinfo_vmentry) == KINFO_VMENTRY_SIZE); 1816 #endif 1817 1818 static void 1819 note_procstat_vmmap(void *arg, struct sbuf *sb, size_t *sizep) 1820 { 1821 struct proc *p; 1822 size_t size; 1823 int structsize; 1824 1825 p = (struct proc *)arg; 1826 if (sb == NULL) { 1827 size = 0; 1828 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN); 1829 sbuf_set_drain(sb, sbuf_drain_count, &size); 1830 sbuf_bcat(sb, &structsize, sizeof(structsize)); 1831 PROC_LOCK(p); 1832 kern_proc_vmmap_out(p, sb); 1833 sbuf_finish(sb); 1834 sbuf_delete(sb); 1835 *sizep = size; 1836 } else { 1837 structsize = sizeof(struct kinfo_vmentry); 1838 sbuf_bcat(sb, &structsize, sizeof(structsize)); 1839 PROC_LOCK(p); 1840 kern_proc_vmmap_out(p, sb); 1841 } 1842 } 1843 1844 static void 1845 note_procstat_groups(void *arg, struct sbuf *sb, size_t *sizep) 1846 { 1847 struct proc *p; 1848 size_t size; 1849 int structsize; 1850 1851 p = (struct proc *)arg; 1852 size = sizeof(structsize) + p->p_ucred->cr_ngroups * sizeof(gid_t); 1853 if (sb != NULL) { 1854 KASSERT(*sizep == size, ("invalid size")); 1855 structsize = sizeof(gid_t); 1856 sbuf_bcat(sb, &structsize, sizeof(structsize)); 1857 sbuf_bcat(sb, p->p_ucred->cr_groups, p->p_ucred->cr_ngroups * 1858 sizeof(gid_t)); 1859 } 1860 *sizep = size; 1861 } 1862 1863 static void 1864 note_procstat_umask(void *arg, struct sbuf *sb, size_t *sizep) 1865 { 1866 struct proc *p; 1867 size_t size; 1868 int structsize; 1869 1870 p = (struct proc *)arg; 1871 size = sizeof(structsize) + sizeof(p->p_fd->fd_cmask); 1872 if (sb != NULL) { 1873 KASSERT(*sizep == size, ("invalid size")); 1874 structsize = sizeof(p->p_fd->fd_cmask); 1875 sbuf_bcat(sb, &structsize, sizeof(structsize)); 1876 sbuf_bcat(sb, &p->p_fd->fd_cmask, sizeof(p->p_fd->fd_cmask)); 1877 } 1878 *sizep = size; 1879 } 1880 1881 static void 1882 note_procstat_rlimit(void *arg, struct sbuf *sb, size_t *sizep) 1883 { 1884 struct proc *p; 1885 struct rlimit rlim[RLIM_NLIMITS]; 1886 size_t size; 1887 int structsize, i; 1888 1889 p = (struct proc *)arg; 1890 size = sizeof(structsize) + sizeof(rlim); 1891 if (sb != NULL) { 1892 KASSERT(*sizep == size, ("invalid size")); 1893 structsize = sizeof(rlim); 1894 sbuf_bcat(sb, &structsize, sizeof(structsize)); 1895 PROC_LOCK(p); 1896 for (i = 0; i < RLIM_NLIMITS; i++) 1897 lim_rlimit(p, i, &rlim[i]); 1898 PROC_UNLOCK(p); 1899 sbuf_bcat(sb, rlim, sizeof(rlim)); 1900 } 1901 *sizep = size; 1902 } 1903 1904 static void 1905 note_procstat_osrel(void *arg, struct sbuf *sb, size_t *sizep) 1906 { 1907 struct proc *p; 1908 size_t size; 1909 int structsize; 1910 1911 p = (struct proc *)arg; 1912 size = sizeof(structsize) + sizeof(p->p_osrel); 1913 if (sb != NULL) { 1914 KASSERT(*sizep == size, ("invalid size")); 1915 structsize = sizeof(p->p_osrel); 1916 sbuf_bcat(sb, &structsize, sizeof(structsize)); 1917 sbuf_bcat(sb, &p->p_osrel, sizeof(p->p_osrel)); 1918 } 1919 *sizep = size; 1920 } 1921 1922 static void 1923 __elfN(note_procstat_psstrings)(void *arg, struct sbuf *sb, size_t *sizep) 1924 { 1925 struct proc *p; 1926 elf_ps_strings_t ps_strings; 1927 size_t size; 1928 int structsize; 1929 1930 p = (struct proc *)arg; 1931 size = sizeof(structsize) + sizeof(ps_strings); 1932 if (sb != NULL) { 1933 KASSERT(*sizep == size, ("invalid size")); 1934 structsize = sizeof(ps_strings); 1935 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 1936 ps_strings = PTROUT(p->p_sysent->sv_psstrings); 1937 #else 1938 ps_strings = p->p_sysent->sv_psstrings; 1939 #endif 1940 sbuf_bcat(sb, &structsize, sizeof(structsize)); 1941 sbuf_bcat(sb, &ps_strings, sizeof(ps_strings)); 1942 } 1943 *sizep = size; 1944 } 1945 1946 static void 1947 __elfN(note_procstat_auxv)(void *arg, struct sbuf *sb, size_t *sizep) 1948 { 1949 struct proc *p; 1950 size_t size; 1951 int structsize; 1952 1953 p = (struct proc *)arg; 1954 if (sb == NULL) { 1955 size = 0; 1956 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN); 1957 sbuf_set_drain(sb, sbuf_drain_count, &size); 1958 sbuf_bcat(sb, &structsize, sizeof(structsize)); 1959 PHOLD(p); 1960 proc_getauxv(curthread, p, sb); 1961 PRELE(p); 1962 sbuf_finish(sb); 1963 sbuf_delete(sb); 1964 *sizep = size; 1965 } else { 1966 structsize = sizeof(Elf_Auxinfo); 1967 sbuf_bcat(sb, &structsize, sizeof(structsize)); 1968 PHOLD(p); 1969 proc_getauxv(curthread, p, sb); 1970 PRELE(p); 1971 } 1972 } 1973 1974 static boolean_t 1975 __elfN(parse_notes)(struct image_params *imgp, Elf_Brandnote *checknote, 1976 int32_t *osrel, const Elf_Phdr *pnote) 1977 { 1978 const Elf_Note *note, *note0, *note_end; 1979 const char *note_name; 1980 int i; 1981 1982 if (pnote == NULL || pnote->p_offset > PAGE_SIZE || 1983 pnote->p_filesz > PAGE_SIZE - pnote->p_offset) 1984 return (FALSE); 1985 1986 note = note0 = (const Elf_Note *)(imgp->image_header + pnote->p_offset); 1987 note_end = (const Elf_Note *)(imgp->image_header + 1988 pnote->p_offset + pnote->p_filesz); 1989 for (i = 0; i < 100 && note >= note0 && note < note_end; i++) { 1990 if (!aligned(note, Elf32_Addr) || (const char *)note_end - 1991 (const char *)note < sizeof(Elf_Note)) 1992 return (FALSE); 1993 if (note->n_namesz != checknote->hdr.n_namesz || 1994 note->n_descsz != checknote->hdr.n_descsz || 1995 note->n_type != checknote->hdr.n_type) 1996 goto nextnote; 1997 note_name = (const char *)(note + 1); 1998 if (note_name + checknote->hdr.n_namesz >= 1999 (const char *)note_end || strncmp(checknote->vendor, 2000 note_name, checknote->hdr.n_namesz) != 0) 2001 goto nextnote; 2002 2003 /* 2004 * Fetch the osreldate for binary 2005 * from the ELF OSABI-note if necessary. 2006 */ 2007 if ((checknote->flags & BN_TRANSLATE_OSREL) != 0 && 2008 checknote->trans_osrel != NULL) 2009 return (checknote->trans_osrel(note, osrel)); 2010 return (TRUE); 2011 2012 nextnote: 2013 note = (const Elf_Note *)((const char *)(note + 1) + 2014 roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE) + 2015 roundup2(note->n_descsz, ELF_NOTE_ROUNDSIZE)); 2016 } 2017 2018 return (FALSE); 2019 } 2020 2021 /* 2022 * Try to find the appropriate ABI-note section for checknote, 2023 * fetch the osreldate for binary from the ELF OSABI-note. Only the 2024 * first page of the image is searched, the same as for headers. 2025 */ 2026 static boolean_t 2027 __elfN(check_note)(struct image_params *imgp, Elf_Brandnote *checknote, 2028 int32_t *osrel) 2029 { 2030 const Elf_Phdr *phdr; 2031 const Elf_Ehdr *hdr; 2032 int i; 2033 2034 hdr = (const Elf_Ehdr *)imgp->image_header; 2035 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 2036 2037 for (i = 0; i < hdr->e_phnum; i++) { 2038 if (phdr[i].p_type == PT_NOTE && 2039 __elfN(parse_notes)(imgp, checknote, osrel, &phdr[i])) 2040 return (TRUE); 2041 } 2042 return (FALSE); 2043 2044 } 2045 2046 /* 2047 * Tell kern_execve.c about it, with a little help from the linker. 2048 */ 2049 static struct execsw __elfN(execsw) = { 2050 __CONCAT(exec_, __elfN(imgact)), 2051 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) 2052 }; 2053 EXEC_SET(__CONCAT(elf, __ELF_WORD_SIZE), __elfN(execsw)); 2054 2055 #ifdef COMPRESS_USER_CORES 2056 /* 2057 * Compress and write out a core segment for a user process. 2058 * 2059 * 'inbuf' is the starting address of a VM segment in the process' address 2060 * space that is to be compressed and written out to the core file. 'dest_buf' 2061 * is a buffer in the kernel's address space. The segment is copied from 2062 * 'inbuf' to 'dest_buf' first before being processed by the compression 2063 * routine gzwrite(). This copying is necessary because the content of the VM 2064 * segment may change between the compression pass and the crc-computation pass 2065 * in gzwrite(). This is because realtime threads may preempt the UNIX kernel. 2066 * 2067 * If inbuf is NULL it is assumed that data is already copied to 'dest_buf'. 2068 */ 2069 static int 2070 compress_core (gzFile file, char *inbuf, char *dest_buf, unsigned int len, 2071 struct thread *td) 2072 { 2073 int len_compressed; 2074 int error = 0; 2075 unsigned int chunk_len; 2076 2077 while (len) { 2078 if (inbuf != NULL) { 2079 chunk_len = (len > CORE_BUF_SIZE) ? CORE_BUF_SIZE : len; 2080 copyin(inbuf, dest_buf, chunk_len); 2081 inbuf += chunk_len; 2082 } else { 2083 chunk_len = len; 2084 } 2085 len_compressed = gzwrite(file, dest_buf, chunk_len); 2086 2087 EVENTHANDLER_INVOKE(app_coredump_progress, td, len_compressed); 2088 2089 if ((unsigned int)len_compressed != chunk_len) { 2090 log(LOG_WARNING, 2091 "compress_core: length mismatch (0x%x returned, " 2092 "0x%x expected)\n", len_compressed, chunk_len); 2093 EVENTHANDLER_INVOKE(app_coredump_error, td, 2094 "compress_core: length mismatch %x -> %x", 2095 chunk_len, len_compressed); 2096 error = EFAULT; 2097 break; 2098 } 2099 len -= chunk_len; 2100 maybe_yield(); 2101 } 2102 2103 return (error); 2104 } 2105 #endif /* COMPRESS_USER_CORES */ 2106 2107 static vm_prot_t 2108 __elfN(trans_prot)(Elf_Word flags) 2109 { 2110 vm_prot_t prot; 2111 2112 prot = 0; 2113 if (flags & PF_X) 2114 prot |= VM_PROT_EXECUTE; 2115 if (flags & PF_W) 2116 prot |= VM_PROT_WRITE; 2117 if (flags & PF_R) 2118 prot |= VM_PROT_READ; 2119 #if __ELF_WORD_SIZE == 32 2120 #if defined(__amd64__) || defined(__ia64__) 2121 if (i386_read_exec && (flags & PF_R)) 2122 prot |= VM_PROT_EXECUTE; 2123 #endif 2124 #endif 2125 return (prot); 2126 } 2127 2128 static Elf_Word 2129 __elfN(untrans_prot)(vm_prot_t prot) 2130 { 2131 Elf_Word flags; 2132 2133 flags = 0; 2134 if (prot & VM_PROT_EXECUTE) 2135 flags |= PF_X; 2136 if (prot & VM_PROT_READ) 2137 flags |= PF_R; 2138 if (prot & VM_PROT_WRITE) 2139 flags |= PF_W; 2140 return (flags); 2141 }
Cache object: 222592ed2ca6039dcc79f13f3a5470a3
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]