Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/kern/imgact_elf.c
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1 /*- 2 * Copyright (c) 2000 David O'Brien 3 * Copyright (c) 1995-1996 Søren Schmidt 4 * Copyright (c) 1996 Peter Wemm 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer 12 * in this position and unchanged. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. The name of the author may not be used to endorse or promote products 17 * derived from this software without specific prior written permission 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD$"); 33 34 #include "opt_compat.h" 35 36 #include <sys/param.h> 37 #include <sys/exec.h> 38 #include <sys/fcntl.h> 39 #include <sys/imgact.h> 40 #include <sys/imgact_elf.h> 41 #include <sys/kernel.h> 42 #include <sys/lock.h> 43 #include <sys/malloc.h> 44 #include <sys/mount.h> 45 #include <sys/mutex.h> 46 #include <sys/mman.h> 47 #include <sys/namei.h> 48 #include <sys/pioctl.h> 49 #include <sys/proc.h> 50 #include <sys/procfs.h> 51 #include <sys/resourcevar.h> 52 #include <sys/sf_buf.h> 53 #include <sys/systm.h> 54 #include <sys/signalvar.h> 55 #include <sys/stat.h> 56 #include <sys/sx.h> 57 #include <sys/syscall.h> 58 #include <sys/sysctl.h> 59 #include <sys/sysent.h> 60 #include <sys/vnode.h> 61 62 #include <vm/vm.h> 63 #include <vm/vm_kern.h> 64 #include <vm/vm_param.h> 65 #include <vm/pmap.h> 66 #include <vm/vm_map.h> 67 #include <vm/vm_object.h> 68 #include <vm/vm_extern.h> 69 70 #include <machine/elf.h> 71 #include <machine/md_var.h> 72 73 #if defined(COMPAT_IA32) && __ELF_WORD_SIZE == 32 74 #include <machine/fpu.h> 75 #include <compat/ia32/ia32_reg.h> 76 #endif 77 78 #define OLD_EI_BRAND 8 79 80 static int __elfN(check_header)(const Elf_Ehdr *hdr); 81 static Elf_Brandinfo *__elfN(get_brandinfo)(const Elf_Ehdr *hdr, 82 const char *interp); 83 static int __elfN(load_file)(struct proc *p, const char *file, u_long *addr, 84 u_long *entry, size_t pagesize); 85 static int __elfN(load_section)(struct vmspace *vmspace, vm_object_t object, 86 vm_offset_t offset, caddr_t vmaddr, size_t memsz, size_t filsz, 87 vm_prot_t prot, size_t pagesize); 88 static int __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp); 89 90 SYSCTL_NODE(_kern, OID_AUTO, __CONCAT(elf, __ELF_WORD_SIZE), CTLFLAG_RW, 0, 91 ""); 92 93 int __elfN(fallback_brand) = -1; 94 SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO, 95 fallback_brand, CTLFLAG_RW, &__elfN(fallback_brand), 0, 96 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) " brand of last resort"); 97 TUNABLE_INT("kern.elf" __XSTRING(__ELF_WORD_SIZE) ".fallback_brand", 98 &__elfN(fallback_brand)); 99 100 static int elf_trace = 0; 101 SYSCTL_INT(_debug, OID_AUTO, __elfN(trace), CTLFLAG_RW, &elf_trace, 0, ""); 102 103 static int elf_legacy_coredump = 0; 104 SYSCTL_INT(_debug, OID_AUTO, __elfN(legacy_coredump), CTLFLAG_RW, 105 &elf_legacy_coredump, 0, ""); 106 107 static Elf_Brandinfo *elf_brand_list[MAX_BRANDS]; 108 109 #define trunc_page_ps(va, ps) ((va) & ~(ps - 1)) 110 #define round_page_ps(va, ps) (((va) + (ps - 1)) & ~(ps - 1)) 111 #define aligned(a, t) (trunc_page_ps((u_long)(a), sizeof(t)) == (u_long)(a)) 112 113 int 114 __elfN(insert_brand_entry)(Elf_Brandinfo *entry) 115 { 116 int i; 117 118 for (i = 0; i < MAX_BRANDS; i++) { 119 if (elf_brand_list[i] == NULL) { 120 elf_brand_list[i] = entry; 121 break; 122 } 123 } 124 if (i == MAX_BRANDS) 125 return (-1); 126 return (0); 127 } 128 129 int 130 __elfN(remove_brand_entry)(Elf_Brandinfo *entry) 131 { 132 int i; 133 134 for (i = 0; i < MAX_BRANDS; i++) { 135 if (elf_brand_list[i] == entry) { 136 elf_brand_list[i] = NULL; 137 break; 138 } 139 } 140 if (i == MAX_BRANDS) 141 return (-1); 142 return (0); 143 } 144 145 int 146 __elfN(brand_inuse)(Elf_Brandinfo *entry) 147 { 148 struct proc *p; 149 int rval = FALSE; 150 151 sx_slock(&allproc_lock); 152 FOREACH_PROC_IN_SYSTEM(p) { 153 if (p->p_sysent == entry->sysvec) { 154 rval = TRUE; 155 break; 156 } 157 } 158 sx_sunlock(&allproc_lock); 159 160 return (rval); 161 } 162 163 static Elf_Brandinfo * 164 __elfN(get_brandinfo)(const Elf_Ehdr *hdr, const char *interp) 165 { 166 Elf_Brandinfo *bi; 167 int i; 168 169 /* 170 * We support three types of branding -- (1) the ELF EI_OSABI field 171 * that SCO added to the ELF spec, (2) FreeBSD 3.x's traditional string 172 * branding w/in the ELF header, and (3) path of the `interp_path' 173 * field. We should also look for an ".note.ABI-tag" ELF section now 174 * in all Linux ELF binaries, FreeBSD 4.1+, and some NetBSD ones. 175 */ 176 177 /* If the executable has a brand, search for it in the brand list. */ 178 for (i = 0; i < MAX_BRANDS; i++) { 179 bi = elf_brand_list[i]; 180 if (bi != NULL && hdr->e_machine == bi->machine && 181 (hdr->e_ident[EI_OSABI] == bi->brand || 182 strncmp((const char *)&hdr->e_ident[OLD_EI_BRAND], 183 bi->compat_3_brand, strlen(bi->compat_3_brand)) == 0)) 184 return (bi); 185 } 186 187 /* Lacking a known brand, search for a recognized interpreter. */ 188 if (interp != NULL) { 189 for (i = 0; i < MAX_BRANDS; i++) { 190 bi = elf_brand_list[i]; 191 if (bi != NULL && hdr->e_machine == bi->machine && 192 strcmp(interp, bi->interp_path) == 0) 193 return (bi); 194 } 195 } 196 197 /* Lacking a recognized interpreter, try the default brand */ 198 for (i = 0; i < MAX_BRANDS; i++) { 199 bi = elf_brand_list[i]; 200 if (bi != NULL && hdr->e_machine == bi->machine && 201 __elfN(fallback_brand) == bi->brand) 202 return (bi); 203 } 204 return (NULL); 205 } 206 207 static int 208 __elfN(check_header)(const Elf_Ehdr *hdr) 209 { 210 Elf_Brandinfo *bi; 211 int i; 212 213 if (!IS_ELF(*hdr) || 214 hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS || 215 hdr->e_ident[EI_DATA] != ELF_TARG_DATA || 216 hdr->e_ident[EI_VERSION] != EV_CURRENT || 217 hdr->e_phentsize != sizeof(Elf_Phdr) || 218 hdr->e_version != ELF_TARG_VER) 219 return (ENOEXEC); 220 221 /* 222 * Make sure we have at least one brand for this machine. 223 */ 224 225 for (i = 0; i < MAX_BRANDS; i++) { 226 bi = elf_brand_list[i]; 227 if (bi != NULL && bi->machine == hdr->e_machine) 228 break; 229 } 230 if (i == MAX_BRANDS) 231 return (ENOEXEC); 232 233 return (0); 234 } 235 236 static int 237 __elfN(map_partial)(vm_map_t map, vm_object_t object, vm_ooffset_t offset, 238 vm_offset_t start, vm_offset_t end, vm_prot_t prot) 239 { 240 struct sf_buf *sf; 241 int error; 242 vm_offset_t off; 243 244 /* 245 * Create the page if it doesn't exist yet. Ignore errors. 246 */ 247 vm_map_lock(map); 248 vm_map_insert(map, NULL, 0, trunc_page(start), round_page(end), 249 VM_PROT_ALL, VM_PROT_ALL, 0); 250 vm_map_unlock(map); 251 252 /* 253 * Find the page from the underlying object. 254 */ 255 if (object) { 256 sf = vm_imgact_map_page(object, offset); 257 if (sf == NULL) 258 return (KERN_FAILURE); 259 off = offset - trunc_page(offset); 260 error = copyout((caddr_t)sf_buf_kva(sf) + off, (caddr_t)start, 261 end - start); 262 vm_imgact_unmap_page(sf); 263 if (error) { 264 return (KERN_FAILURE); 265 } 266 } 267 268 return (KERN_SUCCESS); 269 } 270 271 static int 272 __elfN(map_insert)(vm_map_t map, vm_object_t object, vm_ooffset_t offset, 273 vm_offset_t start, vm_offset_t end, vm_prot_t prot, int cow) 274 { 275 struct sf_buf *sf; 276 vm_offset_t off; 277 vm_size_t sz; 278 int error, rv; 279 280 if (start != trunc_page(start)) { 281 rv = __elfN(map_partial)(map, object, offset, start, 282 round_page(start), prot); 283 if (rv) 284 return (rv); 285 offset += round_page(start) - start; 286 start = round_page(start); 287 } 288 if (end != round_page(end)) { 289 rv = __elfN(map_partial)(map, object, offset + 290 trunc_page(end) - start, trunc_page(end), end, prot); 291 if (rv) 292 return (rv); 293 end = trunc_page(end); 294 } 295 if (end > start) { 296 if (offset & PAGE_MASK) { 297 /* 298 * The mapping is not page aligned. This means we have 299 * to copy the data. Sigh. 300 */ 301 rv = vm_map_find(map, NULL, 0, &start, end - start, 302 FALSE, prot | VM_PROT_WRITE, VM_PROT_ALL, 0); 303 if (rv) 304 return (rv); 305 if (object == NULL) 306 return (KERN_SUCCESS); 307 for (; start < end; start += sz) { 308 sf = vm_imgact_map_page(object, offset); 309 if (sf == NULL) 310 return (KERN_FAILURE); 311 off = offset - trunc_page(offset); 312 sz = end - start; 313 if (sz > PAGE_SIZE - off) 314 sz = PAGE_SIZE - off; 315 error = copyout((caddr_t)sf_buf_kva(sf) + off, 316 (caddr_t)start, sz); 317 vm_imgact_unmap_page(sf); 318 if (error) { 319 return (KERN_FAILURE); 320 } 321 offset += sz; 322 } 323 rv = KERN_SUCCESS; 324 } else { 325 vm_object_reference(object); 326 vm_map_lock(map); 327 rv = vm_map_insert(map, object, offset, start, end, 328 prot, VM_PROT_ALL, cow); 329 vm_map_unlock(map); 330 if (rv != KERN_SUCCESS) 331 vm_object_deallocate(object); 332 } 333 return (rv); 334 } else { 335 return (KERN_SUCCESS); 336 } 337 } 338 339 static int 340 __elfN(load_section)(struct vmspace *vmspace, 341 vm_object_t object, vm_offset_t offset, 342 caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot, 343 size_t pagesize) 344 { 345 struct sf_buf *sf; 346 size_t map_len; 347 vm_offset_t map_addr; 348 int error, rv, cow; 349 size_t copy_len; 350 vm_offset_t file_addr; 351 352 /* 353 * It's necessary to fail if the filsz + offset taken from the 354 * header is greater than the actual file pager object's size. 355 * If we were to allow this, then the vm_map_find() below would 356 * walk right off the end of the file object and into the ether. 357 * 358 * While I'm here, might as well check for something else that 359 * is invalid: filsz cannot be greater than memsz. 360 */ 361 if ((off_t)filsz + offset > object->un_pager.vnp.vnp_size || 362 filsz > memsz) { 363 uprintf("elf_load_section: truncated ELF file\n"); 364 return (ENOEXEC); 365 } 366 367 map_addr = trunc_page_ps((vm_offset_t)vmaddr, pagesize); 368 file_addr = trunc_page_ps(offset, pagesize); 369 370 /* 371 * We have two choices. We can either clear the data in the last page 372 * of an oversized mapping, or we can start the anon mapping a page 373 * early and copy the initialized data into that first page. We 374 * choose the second.. 375 */ 376 if (memsz > filsz) 377 map_len = trunc_page_ps(offset + filsz, pagesize) - file_addr; 378 else 379 map_len = round_page_ps(offset + filsz, pagesize) - file_addr; 380 381 if (map_len != 0) { 382 /* cow flags: don't dump readonly sections in core */ 383 cow = MAP_COPY_ON_WRITE | MAP_PREFAULT | 384 (prot & VM_PROT_WRITE ? 0 : MAP_DISABLE_COREDUMP); 385 386 rv = __elfN(map_insert)(&vmspace->vm_map, 387 object, 388 file_addr, /* file offset */ 389 map_addr, /* virtual start */ 390 map_addr + map_len,/* virtual end */ 391 prot, 392 cow); 393 if (rv != KERN_SUCCESS) 394 return (EINVAL); 395 396 /* we can stop now if we've covered it all */ 397 if (memsz == filsz) { 398 return (0); 399 } 400 } 401 402 403 /* 404 * We have to get the remaining bit of the file into the first part 405 * of the oversized map segment. This is normally because the .data 406 * segment in the file is extended to provide bss. It's a neat idea 407 * to try and save a page, but it's a pain in the behind to implement. 408 */ 409 copy_len = (offset + filsz) - trunc_page_ps(offset + filsz, pagesize); 410 map_addr = trunc_page_ps((vm_offset_t)vmaddr + filsz, pagesize); 411 map_len = round_page_ps((vm_offset_t)vmaddr + memsz, pagesize) - 412 map_addr; 413 414 /* This had damn well better be true! */ 415 if (map_len != 0) { 416 rv = __elfN(map_insert)(&vmspace->vm_map, NULL, 0, map_addr, 417 map_addr + map_len, VM_PROT_ALL, 0); 418 if (rv != KERN_SUCCESS) { 419 return (EINVAL); 420 } 421 } 422 423 if (copy_len != 0) { 424 vm_offset_t off; 425 426 sf = vm_imgact_map_page(object, offset + filsz); 427 if (sf == NULL) 428 return (EIO); 429 430 /* send the page fragment to user space */ 431 off = trunc_page_ps(offset + filsz, pagesize) - 432 trunc_page(offset + filsz); 433 error = copyout((caddr_t)sf_buf_kva(sf) + off, 434 (caddr_t)map_addr, copy_len); 435 vm_imgact_unmap_page(sf); 436 if (error) { 437 return (error); 438 } 439 } 440 441 /* 442 * set it to the specified protection. 443 * XXX had better undo the damage from pasting over the cracks here! 444 */ 445 vm_map_protect(&vmspace->vm_map, trunc_page(map_addr), 446 round_page(map_addr + map_len), prot, FALSE); 447 448 return (0); 449 } 450 451 /* 452 * Load the file "file" into memory. It may be either a shared object 453 * or an executable. 454 * 455 * The "addr" reference parameter is in/out. On entry, it specifies 456 * the address where a shared object should be loaded. If the file is 457 * an executable, this value is ignored. On exit, "addr" specifies 458 * where the file was actually loaded. 459 * 460 * The "entry" reference parameter is out only. On exit, it specifies 461 * the entry point for the loaded file. 462 */ 463 static int 464 __elfN(load_file)(struct proc *p, const char *file, u_long *addr, 465 u_long *entry, size_t pagesize) 466 { 467 struct { 468 struct nameidata nd; 469 struct vattr attr; 470 struct image_params image_params; 471 } *tempdata; 472 const Elf_Ehdr *hdr = NULL; 473 const Elf_Phdr *phdr = NULL; 474 struct nameidata *nd; 475 struct vmspace *vmspace = p->p_vmspace; 476 struct vattr *attr; 477 struct image_params *imgp; 478 vm_prot_t prot; 479 u_long rbase; 480 u_long base_addr = 0; 481 int vfslocked, error, i, numsegs; 482 483 if (curthread->td_proc != p) 484 panic("elf_load_file - thread"); /* XXXKSE DIAGNOSTIC */ 485 486 tempdata = malloc(sizeof(*tempdata), M_TEMP, M_WAITOK); 487 nd = &tempdata->nd; 488 attr = &tempdata->attr; 489 imgp = &tempdata->image_params; 490 491 /* 492 * Initialize part of the common data 493 */ 494 imgp->proc = p; 495 imgp->attr = attr; 496 imgp->firstpage = NULL; 497 imgp->image_header = NULL; 498 imgp->object = NULL; 499 imgp->execlabel = NULL; 500 501 /* XXXKSE */ 502 NDINIT(nd, LOOKUP, MPSAFE|LOCKLEAF|FOLLOW, UIO_SYSSPACE, file, 503 curthread); 504 vfslocked = 0; 505 if ((error = namei(nd)) != 0) { 506 nd->ni_vp = NULL; 507 goto fail; 508 } 509 vfslocked = NDHASGIANT(nd); 510 NDFREE(nd, NDF_ONLY_PNBUF); 511 imgp->vp = nd->ni_vp; 512 513 /* 514 * Check permissions, modes, uid, etc on the file, and "open" it. 515 */ 516 error = exec_check_permissions(imgp); 517 if (error) 518 goto fail; 519 520 error = exec_map_first_page(imgp); 521 if (error) 522 goto fail; 523 524 /* 525 * Also make certain that the interpreter stays the same, so set 526 * its VV_TEXT flag, too. 527 */ 528 nd->ni_vp->v_vflag |= VV_TEXT; 529 530 imgp->object = nd->ni_vp->v_object; 531 532 hdr = (const Elf_Ehdr *)imgp->image_header; 533 if ((error = __elfN(check_header)(hdr)) != 0) 534 goto fail; 535 if (hdr->e_type == ET_DYN) 536 rbase = *addr; 537 else if (hdr->e_type == ET_EXEC) 538 rbase = 0; 539 else { 540 error = ENOEXEC; 541 goto fail; 542 } 543 544 /* Only support headers that fit within first page for now */ 545 /* (multiplication of two Elf_Half fields will not overflow) */ 546 if ((hdr->e_phoff > PAGE_SIZE) || 547 (hdr->e_phentsize * hdr->e_phnum) > PAGE_SIZE - hdr->e_phoff) { 548 error = ENOEXEC; 549 goto fail; 550 } 551 552 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 553 if (!aligned(phdr, Elf_Addr)) { 554 error = ENOEXEC; 555 goto fail; 556 } 557 558 for (i = 0, numsegs = 0; i < hdr->e_phnum; i++) { 559 if (phdr[i].p_type == PT_LOAD) { /* Loadable segment */ 560 prot = 0; 561 if (phdr[i].p_flags & PF_X) 562 prot |= VM_PROT_EXECUTE; 563 if (phdr[i].p_flags & PF_W) 564 prot |= VM_PROT_WRITE; 565 if (phdr[i].p_flags & PF_R) 566 prot |= VM_PROT_READ; 567 568 if ((error = __elfN(load_section)(vmspace, 569 imgp->object, phdr[i].p_offset, 570 (caddr_t)(uintptr_t)phdr[i].p_vaddr + rbase, 571 phdr[i].p_memsz, phdr[i].p_filesz, prot, 572 pagesize)) != 0) 573 goto fail; 574 /* 575 * Establish the base address if this is the 576 * first segment. 577 */ 578 if (numsegs == 0) 579 base_addr = trunc_page(phdr[i].p_vaddr + 580 rbase); 581 numsegs++; 582 } 583 } 584 *addr = base_addr; 585 *entry = (unsigned long)hdr->e_entry + rbase; 586 587 fail: 588 if (imgp->firstpage) 589 exec_unmap_first_page(imgp); 590 591 if (nd->ni_vp) 592 vput(nd->ni_vp); 593 594 VFS_UNLOCK_GIANT(vfslocked); 595 free(tempdata, M_TEMP); 596 597 return (error); 598 } 599 600 static const char FREEBSD_ABI_VENDOR[] = "FreeBSD"; 601 602 static int 603 __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp) 604 { 605 const Elf_Ehdr *hdr = (const Elf_Ehdr *)imgp->image_header; 606 const Elf_Phdr *phdr, *pnote = NULL; 607 Elf_Auxargs *elf_auxargs; 608 struct vmspace *vmspace; 609 vm_prot_t prot; 610 u_long text_size = 0, data_size = 0, total_size = 0; 611 u_long text_addr = 0, data_addr = 0; 612 u_long seg_size, seg_addr; 613 u_long addr, entry = 0, proghdr = 0; 614 int error = 0, i; 615 const char *interp = NULL, *newinterp = NULL; 616 Elf_Brandinfo *brand_info; 617 const Elf_Note *note, *note_end; 618 char *path; 619 const char *note_name; 620 struct thread *td = curthread; 621 struct sysentvec *sv; 622 623 /* 624 * Do we have a valid ELF header ? 625 * 626 * Only allow ET_EXEC & ET_DYN here, reject ET_DYN later 627 * if particular brand doesn't support it. 628 */ 629 if (__elfN(check_header)(hdr) != 0 || 630 (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN)) 631 return (-1); 632 633 /* 634 * From here on down, we return an errno, not -1, as we've 635 * detected an ELF file. 636 */ 637 638 if ((hdr->e_phoff > PAGE_SIZE) || 639 (hdr->e_phoff + hdr->e_phentsize * hdr->e_phnum) > PAGE_SIZE) { 640 /* Only support headers in first page for now */ 641 return (ENOEXEC); 642 } 643 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 644 if (!aligned(phdr, Elf_Addr)) 645 return (ENOEXEC); 646 for (i = 0; i < hdr->e_phnum; i++) { 647 if (phdr[i].p_type == PT_INTERP) { 648 /* Path to interpreter */ 649 if (phdr[i].p_filesz > MAXPATHLEN || 650 phdr[i].p_offset + phdr[i].p_filesz > PAGE_SIZE) 651 return (ENOEXEC); 652 interp = imgp->image_header + phdr[i].p_offset; 653 break; 654 } 655 } 656 657 brand_info = __elfN(get_brandinfo)(hdr, interp); 658 if (brand_info == NULL) { 659 uprintf("ELF binary type \"%u\" not known.\n", 660 hdr->e_ident[EI_OSABI]); 661 return (ENOEXEC); 662 } 663 if (hdr->e_type == ET_DYN && 664 (brand_info->flags & BI_CAN_EXEC_DYN) == 0) 665 return (ENOEXEC); 666 sv = brand_info->sysvec; 667 if (interp != NULL && brand_info->interp_newpath != NULL) 668 newinterp = brand_info->interp_newpath; 669 670 /* 671 * Avoid a possible deadlock if the current address space is destroyed 672 * and that address space maps the locked vnode. In the common case, 673 * the locked vnode's v_usecount is decremented but remains greater 674 * than zero. Consequently, the vnode lock is not needed by vrele(). 675 * However, in cases where the vnode lock is external, such as nullfs, 676 * v_usecount may become zero. 677 */ 678 VOP_UNLOCK(imgp->vp, 0, td); 679 680 error = exec_new_vmspace(imgp, sv); 681 imgp->proc->p_sysent = sv; 682 683 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY, td); 684 if (error) 685 return (error); 686 687 vmspace = imgp->proc->p_vmspace; 688 689 for (i = 0; i < hdr->e_phnum; i++) { 690 switch (phdr[i].p_type) { 691 case PT_LOAD: /* Loadable segment */ 692 prot = 0; 693 if (phdr[i].p_flags & PF_X) 694 prot |= VM_PROT_EXECUTE; 695 if (phdr[i].p_flags & PF_W) 696 prot |= VM_PROT_WRITE; 697 if (phdr[i].p_flags & PF_R) 698 prot |= VM_PROT_READ; 699 700 #if defined(__ia64__) && __ELF_WORD_SIZE == 32 && defined(IA32_ME_HARDER) 701 /* 702 * Some x86 binaries assume read == executable, 703 * notably the M3 runtime and therefore cvsup 704 */ 705 if (prot & VM_PROT_READ) 706 prot |= VM_PROT_EXECUTE; 707 #endif 708 709 if ((error = __elfN(load_section)(vmspace, 710 imgp->object, phdr[i].p_offset, 711 (caddr_t)(uintptr_t)phdr[i].p_vaddr, 712 phdr[i].p_memsz, phdr[i].p_filesz, prot, 713 sv->sv_pagesize)) != 0) 714 return (error); 715 716 /* 717 * If this segment contains the program headers, 718 * remember their virtual address for the AT_PHDR 719 * aux entry. Static binaries don't usually include 720 * a PT_PHDR entry. 721 */ 722 if (phdr[i].p_offset == 0 && 723 hdr->e_phoff + hdr->e_phnum * hdr->e_phentsize 724 <= phdr[i].p_filesz) 725 proghdr = phdr[i].p_vaddr + hdr->e_phoff; 726 727 seg_addr = trunc_page(phdr[i].p_vaddr); 728 seg_size = round_page(phdr[i].p_memsz + 729 phdr[i].p_vaddr - seg_addr); 730 731 /* 732 * Is this .text or .data? We can't use 733 * VM_PROT_WRITE or VM_PROT_EXEC, it breaks the 734 * alpha terribly and possibly does other bad 735 * things so we stick to the old way of figuring 736 * it out: If the segment contains the program 737 * entry point, it's a text segment, otherwise it 738 * is a data segment. 739 * 740 * Note that obreak() assumes that data_addr + 741 * data_size == end of data load area, and the ELF 742 * file format expects segments to be sorted by 743 * address. If multiple data segments exist, the 744 * last one will be used. 745 */ 746 if (hdr->e_entry >= phdr[i].p_vaddr && 747 hdr->e_entry < (phdr[i].p_vaddr + 748 phdr[i].p_memsz)) { 749 text_size = seg_size; 750 text_addr = seg_addr; 751 entry = (u_long)hdr->e_entry; 752 } else { 753 data_size = seg_size; 754 data_addr = seg_addr; 755 } 756 total_size += seg_size; 757 break; 758 case PT_PHDR: /* Program header table info */ 759 proghdr = phdr[i].p_vaddr; 760 break; 761 case PT_NOTE: 762 pnote = &phdr[i]; 763 break; 764 default: 765 break; 766 } 767 } 768 769 if (data_addr == 0 && data_size == 0) { 770 data_addr = text_addr; 771 data_size = text_size; 772 } 773 774 /* 775 * Check limits. It should be safe to check the 776 * limits after loading the segments since we do 777 * not actually fault in all the segments pages. 778 */ 779 PROC_LOCK(imgp->proc); 780 if (data_size > lim_cur(imgp->proc, RLIMIT_DATA) || 781 text_size > maxtsiz || 782 total_size > lim_cur(imgp->proc, RLIMIT_VMEM)) { 783 PROC_UNLOCK(imgp->proc); 784 return (ENOMEM); 785 } 786 787 vmspace->vm_tsize = text_size >> PAGE_SHIFT; 788 vmspace->vm_taddr = (caddr_t)(uintptr_t)text_addr; 789 vmspace->vm_dsize = data_size >> PAGE_SHIFT; 790 vmspace->vm_daddr = (caddr_t)(uintptr_t)data_addr; 791 792 /* 793 * We load the dynamic linker where a userland call 794 * to mmap(0, ...) would put it. The rationale behind this 795 * calculation is that it leaves room for the heap to grow to 796 * its maximum allowed size. 797 */ 798 addr = round_page((vm_offset_t)imgp->proc->p_vmspace->vm_daddr + 799 lim_max(imgp->proc, RLIMIT_DATA)); 800 PROC_UNLOCK(imgp->proc); 801 802 imgp->entry_addr = entry; 803 804 if (interp != NULL) { 805 int have_interp = FALSE; 806 VOP_UNLOCK(imgp->vp, 0, td); 807 if (brand_info->emul_path != NULL && 808 brand_info->emul_path[0] != '\0') { 809 path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 810 snprintf(path, MAXPATHLEN, "%s%s", 811 brand_info->emul_path, interp); 812 error = __elfN(load_file)(imgp->proc, path, &addr, 813 &imgp->entry_addr, sv->sv_pagesize); 814 free(path, M_TEMP); 815 if (error == 0) 816 have_interp = TRUE; 817 } 818 if (!have_interp && newinterp != NULL) { 819 error = __elfN(load_file)(imgp->proc, newinterp, &addr, 820 &imgp->entry_addr, sv->sv_pagesize); 821 if (error == 0) 822 have_interp = TRUE; 823 } 824 if (!have_interp) { 825 error = __elfN(load_file)(imgp->proc, interp, &addr, 826 &imgp->entry_addr, sv->sv_pagesize); 827 } 828 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY, td); 829 if (error != 0) { 830 uprintf("ELF interpreter %s not found\n", interp); 831 return (error); 832 } 833 } 834 835 /* 836 * Construct auxargs table (used by the fixup routine) 837 */ 838 elf_auxargs = malloc(sizeof(Elf_Auxargs), M_TEMP, M_WAITOK); 839 elf_auxargs->execfd = -1; 840 elf_auxargs->phdr = proghdr; 841 elf_auxargs->phent = hdr->e_phentsize; 842 elf_auxargs->phnum = hdr->e_phnum; 843 elf_auxargs->pagesz = PAGE_SIZE; 844 elf_auxargs->base = addr; 845 elf_auxargs->flags = 0; 846 elf_auxargs->entry = entry; 847 elf_auxargs->trace = elf_trace; 848 849 imgp->auxargs = elf_auxargs; 850 imgp->interpreted = 0; 851 852 /* 853 * Try to fetch the osreldate for FreeBSD binary from the ELF 854 * OSABI-note. Only the first page of the image is searched, 855 * the same as for headers. 856 */ 857 if (pnote != NULL && pnote->p_offset < PAGE_SIZE && 858 pnote->p_offset + pnote->p_filesz < PAGE_SIZE ) { 859 note = (const Elf_Note *)(imgp->image_header + pnote->p_offset); 860 if (!aligned(note, Elf32_Addr)) { 861 free(imgp->auxargs, M_TEMP); 862 imgp->auxargs = NULL; 863 return (ENOEXEC); 864 } 865 note_end = (const Elf_Note *)(imgp->image_header + pnote->p_offset + 866 pnote->p_filesz); 867 while (note < note_end) { 868 if (note->n_namesz == sizeof(FREEBSD_ABI_VENDOR) && 869 note->n_descsz == sizeof(int32_t) && 870 note->n_type == 1 /* ABI_NOTETYPE */) { 871 note_name = (const char *)(note + 1); 872 if (strncmp(FREEBSD_ABI_VENDOR, note_name, 873 sizeof(FREEBSD_ABI_VENDOR)) == 0) { 874 imgp->proc->p_osrel = *(const int32_t *) 875 (note_name + 876 round_page_ps(sizeof(FREEBSD_ABI_VENDOR), 877 sizeof(Elf32_Addr))); 878 break; 879 } 880 } 881 note = (const Elf_Note *)((const char *)(note + 1) + 882 round_page_ps(note->n_namesz, sizeof(Elf32_Addr)) + 883 round_page_ps(note->n_descsz, sizeof(Elf32_Addr))); 884 } 885 } 886 887 return (error); 888 } 889 890 #define suword __CONCAT(suword, __ELF_WORD_SIZE) 891 892 int 893 __elfN(freebsd_fixup)(register_t **stack_base, struct image_params *imgp) 894 { 895 Elf_Auxargs *args = (Elf_Auxargs *)imgp->auxargs; 896 Elf_Addr *base; 897 Elf_Addr *pos; 898 899 base = (Elf_Addr *)*stack_base; 900 pos = base + (imgp->args->argc + imgp->args->envc + 2); 901 902 if (args->trace) { 903 AUXARGS_ENTRY(pos, AT_DEBUG, 1); 904 } 905 if (args->execfd != -1) { 906 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd); 907 } 908 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr); 909 AUXARGS_ENTRY(pos, AT_PHENT, args->phent); 910 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum); 911 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz); 912 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags); 913 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry); 914 AUXARGS_ENTRY(pos, AT_BASE, args->base); 915 AUXARGS_ENTRY(pos, AT_NULL, 0); 916 917 free(imgp->auxargs, M_TEMP); 918 imgp->auxargs = NULL; 919 920 base--; 921 suword(base, (long)imgp->args->argc); 922 *stack_base = (register_t *)base; 923 return (0); 924 } 925 926 /* 927 * Code for generating ELF core dumps. 928 */ 929 930 typedef void (*segment_callback)(vm_map_entry_t, void *); 931 932 /* Closure for cb_put_phdr(). */ 933 struct phdr_closure { 934 Elf_Phdr *phdr; /* Program header to fill in */ 935 Elf_Off offset; /* Offset of segment in core file */ 936 }; 937 938 /* Closure for cb_size_segment(). */ 939 struct sseg_closure { 940 int count; /* Count of writable segments. */ 941 size_t size; /* Total size of all writable segments. */ 942 }; 943 944 static void cb_put_phdr(vm_map_entry_t, void *); 945 static void cb_size_segment(vm_map_entry_t, void *); 946 static void each_writable_segment(struct thread *, segment_callback, void *); 947 static int __elfN(corehdr)(struct thread *, struct vnode *, struct ucred *, 948 int, void *, size_t); 949 static void __elfN(puthdr)(struct thread *, void *, size_t *, int); 950 static void __elfN(putnote)(void *, size_t *, const char *, int, 951 const void *, size_t); 952 953 int 954 __elfN(coredump)(td, vp, limit) 955 struct thread *td; 956 struct vnode *vp; 957 off_t limit; 958 { 959 struct ucred *cred = td->td_ucred; 960 int error = 0; 961 struct sseg_closure seginfo; 962 void *hdr; 963 size_t hdrsize; 964 965 /* Size the program segments. */ 966 seginfo.count = 0; 967 seginfo.size = 0; 968 each_writable_segment(td, cb_size_segment, &seginfo); 969 970 /* 971 * Calculate the size of the core file header area by making 972 * a dry run of generating it. Nothing is written, but the 973 * size is calculated. 974 */ 975 hdrsize = 0; 976 __elfN(puthdr)(td, (void *)NULL, &hdrsize, seginfo.count); 977 978 if (hdrsize + seginfo.size >= limit) 979 return (EFAULT); 980 981 /* 982 * Allocate memory for building the header, fill it up, 983 * and write it out. 984 */ 985 hdr = malloc(hdrsize, M_TEMP, M_WAITOK); 986 if (hdr == NULL) { 987 return (EINVAL); 988 } 989 error = __elfN(corehdr)(td, vp, cred, seginfo.count, hdr, hdrsize); 990 991 /* Write the contents of all of the writable segments. */ 992 if (error == 0) { 993 Elf_Phdr *php; 994 off_t offset; 995 int i; 996 997 php = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr)) + 1; 998 offset = hdrsize; 999 for (i = 0; i < seginfo.count; i++) { 1000 error = vn_rdwr_inchunks(UIO_WRITE, vp, 1001 (caddr_t)(uintptr_t)php->p_vaddr, 1002 php->p_filesz, offset, UIO_USERSPACE, 1003 IO_UNIT | IO_DIRECT, cred, NOCRED, NULL, 1004 curthread); /* XXXKSE */ 1005 if (error != 0) 1006 break; 1007 offset += php->p_filesz; 1008 php++; 1009 } 1010 } 1011 free(hdr, M_TEMP); 1012 1013 return (error); 1014 } 1015 1016 /* 1017 * A callback for each_writable_segment() to write out the segment's 1018 * program header entry. 1019 */ 1020 static void 1021 cb_put_phdr(entry, closure) 1022 vm_map_entry_t entry; 1023 void *closure; 1024 { 1025 struct phdr_closure *phc = (struct phdr_closure *)closure; 1026 Elf_Phdr *phdr = phc->phdr; 1027 1028 phc->offset = round_page(phc->offset); 1029 1030 phdr->p_type = PT_LOAD; 1031 phdr->p_offset = phc->offset; 1032 phdr->p_vaddr = entry->start; 1033 phdr->p_paddr = 0; 1034 phdr->p_filesz = phdr->p_memsz = entry->end - entry->start; 1035 phdr->p_align = PAGE_SIZE; 1036 phdr->p_flags = 0; 1037 if (entry->protection & VM_PROT_READ) 1038 phdr->p_flags |= PF_R; 1039 if (entry->protection & VM_PROT_WRITE) 1040 phdr->p_flags |= PF_W; 1041 if (entry->protection & VM_PROT_EXECUTE) 1042 phdr->p_flags |= PF_X; 1043 1044 phc->offset += phdr->p_filesz; 1045 phc->phdr++; 1046 } 1047 1048 /* 1049 * A callback for each_writable_segment() to gather information about 1050 * the number of segments and their total size. 1051 */ 1052 static void 1053 cb_size_segment(entry, closure) 1054 vm_map_entry_t entry; 1055 void *closure; 1056 { 1057 struct sseg_closure *ssc = (struct sseg_closure *)closure; 1058 1059 ssc->count++; 1060 ssc->size += entry->end - entry->start; 1061 } 1062 1063 /* 1064 * For each writable segment in the process's memory map, call the given 1065 * function with a pointer to the map entry and some arbitrary 1066 * caller-supplied data. 1067 */ 1068 static void 1069 each_writable_segment(td, func, closure) 1070 struct thread *td; 1071 segment_callback func; 1072 void *closure; 1073 { 1074 struct proc *p = td->td_proc; 1075 vm_map_t map = &p->p_vmspace->vm_map; 1076 vm_map_entry_t entry; 1077 vm_object_t backing_object, object; 1078 boolean_t ignore_entry; 1079 1080 vm_map_lock_read(map); 1081 for (entry = map->header.next; entry != &map->header; 1082 entry = entry->next) { 1083 /* 1084 * Don't dump inaccessible mappings, deal with legacy 1085 * coredump mode. 1086 * 1087 * Note that read-only segments related to the elf binary 1088 * are marked MAP_ENTRY_NOCOREDUMP now so we no longer 1089 * need to arbitrarily ignore such segments. 1090 */ 1091 if (elf_legacy_coredump) { 1092 if ((entry->protection & VM_PROT_RW) != VM_PROT_RW) 1093 continue; 1094 } else { 1095 if ((entry->protection & VM_PROT_ALL) == 0) 1096 continue; 1097 } 1098 1099 /* 1100 * Dont include memory segment in the coredump if 1101 * MAP_NOCORE is set in mmap(2) or MADV_NOCORE in 1102 * madvise(2). Do not dump submaps (i.e. parts of the 1103 * kernel map). 1104 */ 1105 if (entry->eflags & (MAP_ENTRY_NOCOREDUMP|MAP_ENTRY_IS_SUB_MAP)) 1106 continue; 1107 1108 if ((object = entry->object.vm_object) == NULL) 1109 continue; 1110 1111 /* Ignore memory-mapped devices and such things. */ 1112 VM_OBJECT_LOCK(object); 1113 while ((backing_object = object->backing_object) != NULL) { 1114 VM_OBJECT_LOCK(backing_object); 1115 VM_OBJECT_UNLOCK(object); 1116 object = backing_object; 1117 } 1118 ignore_entry = object->type != OBJT_DEFAULT && 1119 object->type != OBJT_SWAP && object->type != OBJT_VNODE; 1120 VM_OBJECT_UNLOCK(object); 1121 if (ignore_entry) 1122 continue; 1123 1124 (*func)(entry, closure); 1125 } 1126 vm_map_unlock_read(map); 1127 } 1128 1129 /* 1130 * Write the core file header to the file, including padding up to 1131 * the page boundary. 1132 */ 1133 static int 1134 __elfN(corehdr)(td, vp, cred, numsegs, hdr, hdrsize) 1135 struct thread *td; 1136 struct vnode *vp; 1137 struct ucred *cred; 1138 int numsegs; 1139 size_t hdrsize; 1140 void *hdr; 1141 { 1142 size_t off; 1143 1144 /* Fill in the header. */ 1145 bzero(hdr, hdrsize); 1146 off = 0; 1147 __elfN(puthdr)(td, hdr, &off, numsegs); 1148 1149 /* Write it to the core file. */ 1150 return (vn_rdwr_inchunks(UIO_WRITE, vp, hdr, hdrsize, (off_t)0, 1151 UIO_SYSSPACE, IO_UNIT | IO_DIRECT, cred, NOCRED, NULL, 1152 td)); /* XXXKSE */ 1153 } 1154 1155 #if defined(COMPAT_IA32) && __ELF_WORD_SIZE == 32 1156 typedef struct prstatus32 elf_prstatus_t; 1157 typedef struct prpsinfo32 elf_prpsinfo_t; 1158 typedef struct fpreg32 elf_prfpregset_t; 1159 typedef struct fpreg32 elf_fpregset_t; 1160 typedef struct reg32 elf_gregset_t; 1161 #else 1162 typedef prstatus_t elf_prstatus_t; 1163 typedef prpsinfo_t elf_prpsinfo_t; 1164 typedef prfpregset_t elf_prfpregset_t; 1165 typedef prfpregset_t elf_fpregset_t; 1166 typedef gregset_t elf_gregset_t; 1167 #endif 1168 1169 static void 1170 __elfN(puthdr)(struct thread *td, void *dst, size_t *off, int numsegs) 1171 { 1172 struct { 1173 elf_prstatus_t status; 1174 elf_prfpregset_t fpregset; 1175 elf_prpsinfo_t psinfo; 1176 } *tempdata; 1177 elf_prstatus_t *status; 1178 elf_prfpregset_t *fpregset; 1179 elf_prpsinfo_t *psinfo; 1180 struct proc *p; 1181 struct thread *thr; 1182 size_t ehoff, noteoff, notesz, phoff; 1183 1184 p = td->td_proc; 1185 1186 ehoff = *off; 1187 *off += sizeof(Elf_Ehdr); 1188 1189 phoff = *off; 1190 *off += (numsegs + 1) * sizeof(Elf_Phdr); 1191 1192 noteoff = *off; 1193 /* 1194 * Don't allocate space for the notes if we're just calculating 1195 * the size of the header. We also don't collect the data. 1196 */ 1197 if (dst != NULL) { 1198 tempdata = malloc(sizeof(*tempdata), M_TEMP, M_ZERO|M_WAITOK); 1199 status = &tempdata->status; 1200 fpregset = &tempdata->fpregset; 1201 psinfo = &tempdata->psinfo; 1202 } else { 1203 tempdata = NULL; 1204 status = NULL; 1205 fpregset = NULL; 1206 psinfo = NULL; 1207 } 1208 1209 if (dst != NULL) { 1210 psinfo->pr_version = PRPSINFO_VERSION; 1211 psinfo->pr_psinfosz = sizeof(elf_prpsinfo_t); 1212 strlcpy(psinfo->pr_fname, p->p_comm, sizeof(psinfo->pr_fname)); 1213 /* 1214 * XXX - We don't fill in the command line arguments properly 1215 * yet. 1216 */ 1217 strlcpy(psinfo->pr_psargs, p->p_comm, 1218 sizeof(psinfo->pr_psargs)); 1219 } 1220 __elfN(putnote)(dst, off, "FreeBSD", NT_PRPSINFO, psinfo, 1221 sizeof *psinfo); 1222 1223 /* 1224 * To have the debugger select the right thread (LWP) as the initial 1225 * thread, we dump the state of the thread passed to us in td first. 1226 * This is the thread that causes the core dump and thus likely to 1227 * be the right thread one wants to have selected in the debugger. 1228 */ 1229 thr = td; 1230 while (thr != NULL) { 1231 if (dst != NULL) { 1232 status->pr_version = PRSTATUS_VERSION; 1233 status->pr_statussz = sizeof(elf_prstatus_t); 1234 status->pr_gregsetsz = sizeof(elf_gregset_t); 1235 status->pr_fpregsetsz = sizeof(elf_fpregset_t); 1236 status->pr_osreldate = osreldate; 1237 status->pr_cursig = p->p_sig; 1238 status->pr_pid = thr->td_tid; 1239 #if defined(COMPAT_IA32) && __ELF_WORD_SIZE == 32 1240 fill_regs32(thr, &status->pr_reg); 1241 fill_fpregs32(thr, fpregset); 1242 #else 1243 fill_regs(thr, &status->pr_reg); 1244 fill_fpregs(thr, fpregset); 1245 #endif 1246 } 1247 __elfN(putnote)(dst, off, "FreeBSD", NT_PRSTATUS, status, 1248 sizeof *status); 1249 __elfN(putnote)(dst, off, "FreeBSD", NT_FPREGSET, fpregset, 1250 sizeof *fpregset); 1251 /* 1252 * Allow for MD specific notes, as well as any MD 1253 * specific preparations for writing MI notes. 1254 */ 1255 __elfN(dump_thread)(thr, dst, off); 1256 1257 thr = (thr == td) ? TAILQ_FIRST(&p->p_threads) : 1258 TAILQ_NEXT(thr, td_plist); 1259 if (thr == td) 1260 thr = TAILQ_NEXT(thr, td_plist); 1261 } 1262 1263 notesz = *off - noteoff; 1264 1265 if (dst != NULL) 1266 free(tempdata, M_TEMP); 1267 1268 /* Align up to a page boundary for the program segments. */ 1269 *off = round_page(*off); 1270 1271 if (dst != NULL) { 1272 Elf_Ehdr *ehdr; 1273 Elf_Phdr *phdr; 1274 struct phdr_closure phc; 1275 1276 /* 1277 * Fill in the ELF header. 1278 */ 1279 ehdr = (Elf_Ehdr *)((char *)dst + ehoff); 1280 ehdr->e_ident[EI_MAG0] = ELFMAG0; 1281 ehdr->e_ident[EI_MAG1] = ELFMAG1; 1282 ehdr->e_ident[EI_MAG2] = ELFMAG2; 1283 ehdr->e_ident[EI_MAG3] = ELFMAG3; 1284 ehdr->e_ident[EI_CLASS] = ELF_CLASS; 1285 ehdr->e_ident[EI_DATA] = ELF_DATA; 1286 ehdr->e_ident[EI_VERSION] = EV_CURRENT; 1287 ehdr->e_ident[EI_OSABI] = ELFOSABI_FREEBSD; 1288 ehdr->e_ident[EI_ABIVERSION] = 0; 1289 ehdr->e_ident[EI_PAD] = 0; 1290 ehdr->e_type = ET_CORE; 1291 #if defined(COMPAT_IA32) && __ELF_WORD_SIZE == 32 1292 ehdr->e_machine = EM_386; 1293 #else 1294 ehdr->e_machine = ELF_ARCH; 1295 #endif 1296 ehdr->e_version = EV_CURRENT; 1297 ehdr->e_entry = 0; 1298 ehdr->e_phoff = phoff; 1299 ehdr->e_flags = 0; 1300 ehdr->e_ehsize = sizeof(Elf_Ehdr); 1301 ehdr->e_phentsize = sizeof(Elf_Phdr); 1302 ehdr->e_phnum = numsegs + 1; 1303 ehdr->e_shentsize = sizeof(Elf_Shdr); 1304 ehdr->e_shnum = 0; 1305 ehdr->e_shstrndx = SHN_UNDEF; 1306 1307 /* 1308 * Fill in the program header entries. 1309 */ 1310 phdr = (Elf_Phdr *)((char *)dst + phoff); 1311 1312 /* The note segement. */ 1313 phdr->p_type = PT_NOTE; 1314 phdr->p_offset = noteoff; 1315 phdr->p_vaddr = 0; 1316 phdr->p_paddr = 0; 1317 phdr->p_filesz = notesz; 1318 phdr->p_memsz = 0; 1319 phdr->p_flags = 0; 1320 phdr->p_align = 0; 1321 phdr++; 1322 1323 /* All the writable segments from the program. */ 1324 phc.phdr = phdr; 1325 phc.offset = *off; 1326 each_writable_segment(td, cb_put_phdr, &phc); 1327 } 1328 } 1329 1330 static void 1331 __elfN(putnote)(void *dst, size_t *off, const char *name, int type, 1332 const void *desc, size_t descsz) 1333 { 1334 Elf_Note note; 1335 1336 note.n_namesz = strlen(name) + 1; 1337 note.n_descsz = descsz; 1338 note.n_type = type; 1339 if (dst != NULL) 1340 bcopy(¬e, (char *)dst + *off, sizeof note); 1341 *off += sizeof note; 1342 if (dst != NULL) 1343 bcopy(name, (char *)dst + *off, note.n_namesz); 1344 *off += roundup2(note.n_namesz, sizeof(Elf_Size)); 1345 if (dst != NULL) 1346 bcopy(desc, (char *)dst + *off, note.n_descsz); 1347 *off += roundup2(note.n_descsz, sizeof(Elf_Size)); 1348 } 1349 1350 /* 1351 * Tell kern_execve.c about it, with a little help from the linker. 1352 */ 1353 static struct execsw __elfN(execsw) = { 1354 __CONCAT(exec_, __elfN(imgact)), 1355 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) 1356 }; 1357 EXEC_SET(__CONCAT(elf, __ELF_WORD_SIZE), __elfN(execsw));
Cache object: 3f3afd1a7fa176ee89b57bca44645238
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