1 /*- 2 * Copyright (c) 2000 David O'Brien 3 * Copyright (c) 1995-1996 S�ren Schmidt 4 * Copyright (c) 1996 Peter Wemm 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer 12 * in this position and unchanged. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. The name of the author may not be used to endorse or promote products 17 * derived from this software without specific prior written permission 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD$"); 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 tempdata = malloc(sizeof(*tempdata), M_TEMP, M_WAITOK); 484 nd = &tempdata->nd; 485 attr = &tempdata->attr; 486 imgp = &tempdata->image_params; 487 488 /* 489 * Initialize part of the common data 490 */ 491 imgp->proc = p; 492 imgp->attr = attr; 493 imgp->firstpage = NULL; 494 imgp->image_header = NULL; 495 imgp->object = NULL; 496 imgp->execlabel = NULL; 497 498 NDINIT(nd, LOOKUP, MPSAFE|LOCKLEAF|FOLLOW, UIO_SYSSPACE, file, 499 curthread); 500 vfslocked = 0; 501 if ((error = namei(nd)) != 0) { 502 nd->ni_vp = NULL; 503 goto fail; 504 } 505 vfslocked = NDHASGIANT(nd); 506 NDFREE(nd, NDF_ONLY_PNBUF); 507 imgp->vp = nd->ni_vp; 508 509 /* 510 * Check permissions, modes, uid, etc on the file, and "open" it. 511 */ 512 error = exec_check_permissions(imgp); 513 if (error) 514 goto fail; 515 516 error = exec_map_first_page(imgp); 517 if (error) 518 goto fail; 519 520 /* 521 * Also make certain that the interpreter stays the same, so set 522 * its VV_TEXT flag, too. 523 */ 524 nd->ni_vp->v_vflag |= VV_TEXT; 525 526 imgp->object = nd->ni_vp->v_object; 527 528 hdr = (const Elf_Ehdr *)imgp->image_header; 529 if ((error = __elfN(check_header)(hdr)) != 0) 530 goto fail; 531 if (hdr->e_type == ET_DYN) 532 rbase = *addr; 533 else if (hdr->e_type == ET_EXEC) 534 rbase = 0; 535 else { 536 error = ENOEXEC; 537 goto fail; 538 } 539 540 /* Only support headers that fit within first page for now */ 541 /* (multiplication of two Elf_Half fields will not overflow) */ 542 if ((hdr->e_phoff > PAGE_SIZE) || 543 (hdr->e_phentsize * hdr->e_phnum) > PAGE_SIZE - hdr->e_phoff) { 544 error = ENOEXEC; 545 goto fail; 546 } 547 548 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 549 if (!aligned(phdr, Elf_Addr)) { 550 error = ENOEXEC; 551 goto fail; 552 } 553 554 for (i = 0, numsegs = 0; i < hdr->e_phnum; i++) { 555 if (phdr[i].p_type == PT_LOAD) { /* Loadable segment */ 556 prot = 0; 557 if (phdr[i].p_flags & PF_X) 558 prot |= VM_PROT_EXECUTE; 559 if (phdr[i].p_flags & PF_W) 560 prot |= VM_PROT_WRITE; 561 if (phdr[i].p_flags & PF_R) 562 prot |= VM_PROT_READ; 563 564 if ((error = __elfN(load_section)(vmspace, 565 imgp->object, phdr[i].p_offset, 566 (caddr_t)(uintptr_t)phdr[i].p_vaddr + rbase, 567 phdr[i].p_memsz, phdr[i].p_filesz, prot, 568 pagesize)) != 0) 569 goto fail; 570 /* 571 * Establish the base address if this is the 572 * first segment. 573 */ 574 if (numsegs == 0) 575 base_addr = trunc_page(phdr[i].p_vaddr + 576 rbase); 577 numsegs++; 578 } 579 } 580 *addr = base_addr; 581 *entry = (unsigned long)hdr->e_entry + rbase; 582 583 fail: 584 if (imgp->firstpage) 585 exec_unmap_first_page(imgp); 586 587 if (nd->ni_vp) 588 vput(nd->ni_vp); 589 590 VFS_UNLOCK_GIANT(vfslocked); 591 free(tempdata, M_TEMP); 592 593 return (error); 594 } 595 596 static const char FREEBSD_ABI_VENDOR[] = "FreeBSD"; 597 598 static int 599 __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp) 600 { 601 const Elf_Ehdr *hdr = (const Elf_Ehdr *)imgp->image_header; 602 const Elf_Phdr *phdr, *pnote = NULL; 603 Elf_Auxargs *elf_auxargs; 604 struct vmspace *vmspace; 605 vm_prot_t prot; 606 u_long text_size = 0, data_size = 0, total_size = 0; 607 u_long text_addr = 0, data_addr = 0; 608 u_long seg_size, seg_addr; 609 u_long addr, entry = 0, proghdr = 0; 610 int error = 0, i; 611 const char *interp = NULL, *newinterp = NULL; 612 Elf_Brandinfo *brand_info; 613 const Elf_Note *note, *note_end; 614 char *path; 615 const char *note_name; 616 struct sysentvec *sv; 617 618 /* 619 * Do we have a valid ELF header ? 620 * 621 * Only allow ET_EXEC & ET_DYN here, reject ET_DYN later 622 * if particular brand doesn't support it. 623 */ 624 if (__elfN(check_header)(hdr) != 0 || 625 (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN)) 626 return (-1); 627 628 /* 629 * From here on down, we return an errno, not -1, as we've 630 * detected an ELF file. 631 */ 632 633 if ((hdr->e_phoff > PAGE_SIZE) || 634 (hdr->e_phoff + hdr->e_phentsize * hdr->e_phnum) > PAGE_SIZE) { 635 /* Only support headers in first page for now */ 636 return (ENOEXEC); 637 } 638 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 639 if (!aligned(phdr, Elf_Addr)) 640 return (ENOEXEC); 641 for (i = 0; i < hdr->e_phnum; i++) { 642 if (phdr[i].p_type == PT_INTERP) { 643 /* Path to interpreter */ 644 if (phdr[i].p_filesz > MAXPATHLEN || 645 phdr[i].p_offset + phdr[i].p_filesz > PAGE_SIZE) 646 return (ENOEXEC); 647 interp = imgp->image_header + phdr[i].p_offset; 648 break; 649 } 650 } 651 652 brand_info = __elfN(get_brandinfo)(hdr, interp); 653 if (brand_info == NULL) { 654 uprintf("ELF binary type \"%u\" not known.\n", 655 hdr->e_ident[EI_OSABI]); 656 return (ENOEXEC); 657 } 658 if (hdr->e_type == ET_DYN && 659 (brand_info->flags & BI_CAN_EXEC_DYN) == 0) 660 return (ENOEXEC); 661 sv = brand_info->sysvec; 662 if (interp != NULL && brand_info->interp_newpath != NULL) 663 newinterp = brand_info->interp_newpath; 664 665 /* 666 * Avoid a possible deadlock if the current address space is destroyed 667 * and that address space maps the locked vnode. In the common case, 668 * the locked vnode's v_usecount is decremented but remains greater 669 * than zero. Consequently, the vnode lock is not needed by vrele(). 670 * However, in cases where the vnode lock is external, such as nullfs, 671 * v_usecount may become zero. 672 */ 673 VOP_UNLOCK(imgp->vp, 0); 674 675 error = exec_new_vmspace(imgp, sv); 676 imgp->proc->p_sysent = sv; 677 678 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY); 679 if (error) 680 return (error); 681 682 vmspace = imgp->proc->p_vmspace; 683 684 for (i = 0; i < hdr->e_phnum; i++) { 685 switch (phdr[i].p_type) { 686 case PT_LOAD: /* Loadable segment */ 687 prot = 0; 688 if (phdr[i].p_flags & PF_X) 689 prot |= VM_PROT_EXECUTE; 690 if (phdr[i].p_flags & PF_W) 691 prot |= VM_PROT_WRITE; 692 if (phdr[i].p_flags & PF_R) 693 prot |= VM_PROT_READ; 694 695 #if defined(__ia64__) && __ELF_WORD_SIZE == 32 && defined(IA32_ME_HARDER) 696 /* 697 * Some x86 binaries assume read == executable, 698 * notably the M3 runtime and therefore cvsup 699 */ 700 if (prot & VM_PROT_READ) 701 prot |= VM_PROT_EXECUTE; 702 #endif 703 704 if ((error = __elfN(load_section)(vmspace, 705 imgp->object, phdr[i].p_offset, 706 (caddr_t)(uintptr_t)phdr[i].p_vaddr, 707 phdr[i].p_memsz, phdr[i].p_filesz, prot, 708 sv->sv_pagesize)) != 0) 709 return (error); 710 711 /* 712 * If this segment contains the program headers, 713 * remember their virtual address for the AT_PHDR 714 * aux entry. Static binaries don't usually include 715 * a PT_PHDR entry. 716 */ 717 if (phdr[i].p_offset == 0 && 718 hdr->e_phoff + hdr->e_phnum * hdr->e_phentsize 719 <= phdr[i].p_filesz) 720 proghdr = phdr[i].p_vaddr + hdr->e_phoff; 721 722 seg_addr = trunc_page(phdr[i].p_vaddr); 723 seg_size = round_page(phdr[i].p_memsz + 724 phdr[i].p_vaddr - seg_addr); 725 726 /* 727 * Is this .text or .data? We can't use 728 * VM_PROT_WRITE or VM_PROT_EXEC, it breaks the 729 * alpha terribly and possibly does other bad 730 * things so we stick to the old way of figuring 731 * it out: If the segment contains the program 732 * entry point, it's a text segment, otherwise it 733 * is a data segment. 734 * 735 * Note that obreak() assumes that data_addr + 736 * data_size == end of data load area, and the ELF 737 * file format expects segments to be sorted by 738 * address. If multiple data segments exist, the 739 * last one will be used. 740 */ 741 if (hdr->e_entry >= phdr[i].p_vaddr && 742 hdr->e_entry < (phdr[i].p_vaddr + 743 phdr[i].p_memsz)) { 744 text_size = seg_size; 745 text_addr = seg_addr; 746 entry = (u_long)hdr->e_entry; 747 } else { 748 data_size = seg_size; 749 data_addr = seg_addr; 750 } 751 total_size += seg_size; 752 break; 753 case PT_PHDR: /* Program header table info */ 754 proghdr = phdr[i].p_vaddr; 755 break; 756 case PT_NOTE: 757 pnote = &phdr[i]; 758 break; 759 default: 760 break; 761 } 762 } 763 764 if (data_addr == 0 && data_size == 0) { 765 data_addr = text_addr; 766 data_size = text_size; 767 } 768 769 /* 770 * Check limits. It should be safe to check the 771 * limits after loading the segments since we do 772 * not actually fault in all the segments pages. 773 */ 774 PROC_LOCK(imgp->proc); 775 if (data_size > lim_cur(imgp->proc, RLIMIT_DATA) || 776 text_size > maxtsiz || 777 total_size > lim_cur(imgp->proc, RLIMIT_VMEM)) { 778 PROC_UNLOCK(imgp->proc); 779 return (ENOMEM); 780 } 781 782 vmspace->vm_tsize = text_size >> PAGE_SHIFT; 783 vmspace->vm_taddr = (caddr_t)(uintptr_t)text_addr; 784 vmspace->vm_dsize = data_size >> PAGE_SHIFT; 785 vmspace->vm_daddr = (caddr_t)(uintptr_t)data_addr; 786 787 /* 788 * We load the dynamic linker where a userland call 789 * to mmap(0, ...) would put it. The rationale behind this 790 * calculation is that it leaves room for the heap to grow to 791 * its maximum allowed size. 792 */ 793 addr = round_page((vm_offset_t)imgp->proc->p_vmspace->vm_daddr + 794 lim_max(imgp->proc, RLIMIT_DATA)); 795 PROC_UNLOCK(imgp->proc); 796 797 imgp->entry_addr = entry; 798 799 if (interp != NULL) { 800 int have_interp = FALSE; 801 VOP_UNLOCK(imgp->vp, 0); 802 if (brand_info->emul_path != NULL && 803 brand_info->emul_path[0] != '\0') { 804 path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 805 snprintf(path, MAXPATHLEN, "%s%s", 806 brand_info->emul_path, interp); 807 error = __elfN(load_file)(imgp->proc, path, &addr, 808 &imgp->entry_addr, sv->sv_pagesize); 809 free(path, M_TEMP); 810 if (error == 0) 811 have_interp = TRUE; 812 } 813 if (!have_interp && newinterp != NULL) { 814 error = __elfN(load_file)(imgp->proc, newinterp, &addr, 815 &imgp->entry_addr, sv->sv_pagesize); 816 if (error == 0) 817 have_interp = TRUE; 818 } 819 if (!have_interp) { 820 error = __elfN(load_file)(imgp->proc, interp, &addr, 821 &imgp->entry_addr, sv->sv_pagesize); 822 } 823 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY); 824 if (error != 0) { 825 uprintf("ELF interpreter %s not found\n", interp); 826 return (error); 827 } 828 } 829 830 /* 831 * Construct auxargs table (used by the fixup routine) 832 */ 833 elf_auxargs = malloc(sizeof(Elf_Auxargs), M_TEMP, M_WAITOK); 834 elf_auxargs->execfd = -1; 835 elf_auxargs->phdr = proghdr; 836 elf_auxargs->phent = hdr->e_phentsize; 837 elf_auxargs->phnum = hdr->e_phnum; 838 elf_auxargs->pagesz = PAGE_SIZE; 839 elf_auxargs->base = addr; 840 elf_auxargs->flags = 0; 841 elf_auxargs->entry = entry; 842 elf_auxargs->trace = elf_trace; 843 844 imgp->auxargs = elf_auxargs; 845 imgp->interpreted = 0; 846 847 /* 848 * Try to fetch the osreldate for FreeBSD binary from the ELF 849 * OSABI-note. Only the first page of the image is searched, 850 * the same as for headers. 851 */ 852 if (pnote != NULL && pnote->p_offset < PAGE_SIZE && 853 pnote->p_offset + pnote->p_filesz < PAGE_SIZE ) { 854 note = (const Elf_Note *)(imgp->image_header + pnote->p_offset); 855 if (!aligned(note, Elf32_Addr)) { 856 free(imgp->auxargs, M_TEMP); 857 imgp->auxargs = NULL; 858 return (ENOEXEC); 859 } 860 note_end = (const Elf_Note *)(imgp->image_header + pnote->p_offset + 861 pnote->p_filesz); 862 while (note < note_end) { 863 if (note->n_namesz == sizeof(FREEBSD_ABI_VENDOR) && 864 note->n_descsz == sizeof(int32_t) && 865 note->n_type == 1 /* ABI_NOTETYPE */) { 866 note_name = (const char *)(note + 1); 867 if (strncmp(FREEBSD_ABI_VENDOR, note_name, 868 sizeof(FREEBSD_ABI_VENDOR)) == 0) { 869 imgp->proc->p_osrel = *(const int32_t *) 870 (note_name + 871 round_page_ps(sizeof(FREEBSD_ABI_VENDOR), 872 sizeof(Elf32_Addr))); 873 break; 874 } 875 } 876 note = (const Elf_Note *)((const char *)(note + 1) + 877 round_page_ps(note->n_namesz, sizeof(Elf32_Addr)) + 878 round_page_ps(note->n_descsz, sizeof(Elf32_Addr))); 879 } 880 } 881 882 return (error); 883 } 884 885 #define suword __CONCAT(suword, __ELF_WORD_SIZE) 886 887 int 888 __elfN(freebsd_fixup)(register_t **stack_base, struct image_params *imgp) 889 { 890 Elf_Auxargs *args = (Elf_Auxargs *)imgp->auxargs; 891 Elf_Addr *base; 892 Elf_Addr *pos; 893 894 base = (Elf_Addr *)*stack_base; 895 pos = base + (imgp->args->argc + imgp->args->envc + 2); 896 897 if (args->trace) { 898 AUXARGS_ENTRY(pos, AT_DEBUG, 1); 899 } 900 if (args->execfd != -1) { 901 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd); 902 } 903 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr); 904 AUXARGS_ENTRY(pos, AT_PHENT, args->phent); 905 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum); 906 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz); 907 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags); 908 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry); 909 AUXARGS_ENTRY(pos, AT_BASE, args->base); 910 AUXARGS_ENTRY(pos, AT_NULL, 0); 911 912 free(imgp->auxargs, M_TEMP); 913 imgp->auxargs = NULL; 914 915 base--; 916 suword(base, (long)imgp->args->argc); 917 *stack_base = (register_t *)base; 918 return (0); 919 } 920 921 /* 922 * Code for generating ELF core dumps. 923 */ 924 925 typedef void (*segment_callback)(vm_map_entry_t, void *); 926 927 /* Closure for cb_put_phdr(). */ 928 struct phdr_closure { 929 Elf_Phdr *phdr; /* Program header to fill in */ 930 Elf_Off offset; /* Offset of segment in core file */ 931 }; 932 933 /* Closure for cb_size_segment(). */ 934 struct sseg_closure { 935 int count; /* Count of writable segments. */ 936 size_t size; /* Total size of all writable segments. */ 937 }; 938 939 static void cb_put_phdr(vm_map_entry_t, void *); 940 static void cb_size_segment(vm_map_entry_t, void *); 941 static void each_writable_segment(struct thread *, segment_callback, void *); 942 static int __elfN(corehdr)(struct thread *, struct vnode *, struct ucred *, 943 int, void *, size_t); 944 static void __elfN(puthdr)(struct thread *, void *, size_t *, int); 945 static void __elfN(putnote)(void *, size_t *, const char *, int, 946 const void *, size_t); 947 948 int 949 __elfN(coredump)(td, vp, limit) 950 struct thread *td; 951 struct vnode *vp; 952 off_t limit; 953 { 954 struct ucred *cred = td->td_ucred; 955 int error = 0; 956 struct sseg_closure seginfo; 957 void *hdr; 958 size_t hdrsize; 959 960 /* Size the program segments. */ 961 seginfo.count = 0; 962 seginfo.size = 0; 963 each_writable_segment(td, cb_size_segment, &seginfo); 964 965 /* 966 * Calculate the size of the core file header area by making 967 * a dry run of generating it. Nothing is written, but the 968 * size is calculated. 969 */ 970 hdrsize = 0; 971 __elfN(puthdr)(td, (void *)NULL, &hdrsize, seginfo.count); 972 973 if (hdrsize + seginfo.size >= limit) 974 return (EFAULT); 975 976 /* 977 * Allocate memory for building the header, fill it up, 978 * and write it out. 979 */ 980 hdr = malloc(hdrsize, M_TEMP, M_WAITOK); 981 if (hdr == NULL) { 982 return (EINVAL); 983 } 984 error = __elfN(corehdr)(td, vp, cred, seginfo.count, hdr, hdrsize); 985 986 /* Write the contents of all of the writable segments. */ 987 if (error == 0) { 988 Elf_Phdr *php; 989 off_t offset; 990 int i; 991 992 php = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr)) + 1; 993 offset = hdrsize; 994 for (i = 0; i < seginfo.count; i++) { 995 error = vn_rdwr_inchunks(UIO_WRITE, vp, 996 (caddr_t)(uintptr_t)php->p_vaddr, 997 php->p_filesz, offset, UIO_USERSPACE, 998 IO_UNIT | IO_DIRECT, cred, NOCRED, NULL, 999 curthread); 1000 if (error != 0) 1001 break; 1002 offset += php->p_filesz; 1003 php++; 1004 } 1005 } 1006 free(hdr, M_TEMP); 1007 1008 return (error); 1009 } 1010 1011 /* 1012 * A callback for each_writable_segment() to write out the segment's 1013 * program header entry. 1014 */ 1015 static void 1016 cb_put_phdr(entry, closure) 1017 vm_map_entry_t entry; 1018 void *closure; 1019 { 1020 struct phdr_closure *phc = (struct phdr_closure *)closure; 1021 Elf_Phdr *phdr = phc->phdr; 1022 1023 phc->offset = round_page(phc->offset); 1024 1025 phdr->p_type = PT_LOAD; 1026 phdr->p_offset = phc->offset; 1027 phdr->p_vaddr = entry->start; 1028 phdr->p_paddr = 0; 1029 phdr->p_filesz = phdr->p_memsz = entry->end - entry->start; 1030 phdr->p_align = PAGE_SIZE; 1031 phdr->p_flags = 0; 1032 if (entry->protection & VM_PROT_READ) 1033 phdr->p_flags |= PF_R; 1034 if (entry->protection & VM_PROT_WRITE) 1035 phdr->p_flags |= PF_W; 1036 if (entry->protection & VM_PROT_EXECUTE) 1037 phdr->p_flags |= PF_X; 1038 1039 phc->offset += phdr->p_filesz; 1040 phc->phdr++; 1041 } 1042 1043 /* 1044 * A callback for each_writable_segment() to gather information about 1045 * the number of segments and their total size. 1046 */ 1047 static void 1048 cb_size_segment(entry, closure) 1049 vm_map_entry_t entry; 1050 void *closure; 1051 { 1052 struct sseg_closure *ssc = (struct sseg_closure *)closure; 1053 1054 ssc->count++; 1055 ssc->size += entry->end - entry->start; 1056 } 1057 1058 /* 1059 * For each writable segment in the process's memory map, call the given 1060 * function with a pointer to the map entry and some arbitrary 1061 * caller-supplied data. 1062 */ 1063 static void 1064 each_writable_segment(td, func, closure) 1065 struct thread *td; 1066 segment_callback func; 1067 void *closure; 1068 { 1069 struct proc *p = td->td_proc; 1070 vm_map_t map = &p->p_vmspace->vm_map; 1071 vm_map_entry_t entry; 1072 vm_object_t backing_object, object; 1073 boolean_t ignore_entry; 1074 1075 vm_map_lock_read(map); 1076 for (entry = map->header.next; entry != &map->header; 1077 entry = entry->next) { 1078 /* 1079 * Don't dump inaccessible mappings, deal with legacy 1080 * coredump mode. 1081 * 1082 * Note that read-only segments related to the elf binary 1083 * are marked MAP_ENTRY_NOCOREDUMP now so we no longer 1084 * need to arbitrarily ignore such segments. 1085 */ 1086 if (elf_legacy_coredump) { 1087 if ((entry->protection & VM_PROT_RW) != VM_PROT_RW) 1088 continue; 1089 } else { 1090 if ((entry->protection & VM_PROT_ALL) == 0) 1091 continue; 1092 } 1093 1094 /* 1095 * Dont include memory segment in the coredump if 1096 * MAP_NOCORE is set in mmap(2) or MADV_NOCORE in 1097 * madvise(2). Do not dump submaps (i.e. parts of the 1098 * kernel map). 1099 */ 1100 if (entry->eflags & (MAP_ENTRY_NOCOREDUMP|MAP_ENTRY_IS_SUB_MAP)) 1101 continue; 1102 1103 if ((object = entry->object.vm_object) == NULL) 1104 continue; 1105 1106 /* Ignore memory-mapped devices and such things. */ 1107 VM_OBJECT_LOCK(object); 1108 while ((backing_object = object->backing_object) != NULL) { 1109 VM_OBJECT_LOCK(backing_object); 1110 VM_OBJECT_UNLOCK(object); 1111 object = backing_object; 1112 } 1113 ignore_entry = object->type != OBJT_DEFAULT && 1114 object->type != OBJT_SWAP && object->type != OBJT_VNODE; 1115 VM_OBJECT_UNLOCK(object); 1116 if (ignore_entry) 1117 continue; 1118 1119 (*func)(entry, closure); 1120 } 1121 vm_map_unlock_read(map); 1122 } 1123 1124 /* 1125 * Write the core file header to the file, including padding up to 1126 * the page boundary. 1127 */ 1128 static int 1129 __elfN(corehdr)(td, vp, cred, numsegs, hdr, hdrsize) 1130 struct thread *td; 1131 struct vnode *vp; 1132 struct ucred *cred; 1133 int numsegs; 1134 size_t hdrsize; 1135 void *hdr; 1136 { 1137 size_t off; 1138 1139 /* Fill in the header. */ 1140 bzero(hdr, hdrsize); 1141 off = 0; 1142 __elfN(puthdr)(td, hdr, &off, numsegs); 1143 1144 /* Write it to the core file. */ 1145 return (vn_rdwr_inchunks(UIO_WRITE, vp, hdr, hdrsize, (off_t)0, 1146 UIO_SYSSPACE, IO_UNIT | IO_DIRECT, cred, NOCRED, NULL, 1147 td)); 1148 } 1149 1150 #if defined(COMPAT_IA32) && __ELF_WORD_SIZE == 32 1151 typedef struct prstatus32 elf_prstatus_t; 1152 typedef struct prpsinfo32 elf_prpsinfo_t; 1153 typedef struct fpreg32 elf_prfpregset_t; 1154 typedef struct fpreg32 elf_fpregset_t; 1155 typedef struct reg32 elf_gregset_t; 1156 #else 1157 typedef prstatus_t elf_prstatus_t; 1158 typedef prpsinfo_t elf_prpsinfo_t; 1159 typedef prfpregset_t elf_prfpregset_t; 1160 typedef prfpregset_t elf_fpregset_t; 1161 typedef gregset_t elf_gregset_t; 1162 #endif 1163 1164 static void 1165 __elfN(puthdr)(struct thread *td, void *dst, size_t *off, int numsegs) 1166 { 1167 struct { 1168 elf_prstatus_t status; 1169 elf_prfpregset_t fpregset; 1170 elf_prpsinfo_t psinfo; 1171 } *tempdata; 1172 elf_prstatus_t *status; 1173 elf_prfpregset_t *fpregset; 1174 elf_prpsinfo_t *psinfo; 1175 struct proc *p; 1176 struct thread *thr; 1177 size_t ehoff, noteoff, notesz, phoff; 1178 1179 p = td->td_proc; 1180 1181 ehoff = *off; 1182 *off += sizeof(Elf_Ehdr); 1183 1184 phoff = *off; 1185 *off += (numsegs + 1) * sizeof(Elf_Phdr); 1186 1187 noteoff = *off; 1188 /* 1189 * Don't allocate space for the notes if we're just calculating 1190 * the size of the header. We also don't collect the data. 1191 */ 1192 if (dst != NULL) { 1193 tempdata = malloc(sizeof(*tempdata), M_TEMP, M_ZERO|M_WAITOK); 1194 status = &tempdata->status; 1195 fpregset = &tempdata->fpregset; 1196 psinfo = &tempdata->psinfo; 1197 } else { 1198 tempdata = NULL; 1199 status = NULL; 1200 fpregset = NULL; 1201 psinfo = NULL; 1202 } 1203 1204 if (dst != NULL) { 1205 psinfo->pr_version = PRPSINFO_VERSION; 1206 psinfo->pr_psinfosz = sizeof(elf_prpsinfo_t); 1207 strlcpy(psinfo->pr_fname, p->p_comm, sizeof(psinfo->pr_fname)); 1208 /* 1209 * XXX - We don't fill in the command line arguments properly 1210 * yet. 1211 */ 1212 strlcpy(psinfo->pr_psargs, p->p_comm, 1213 sizeof(psinfo->pr_psargs)); 1214 } 1215 __elfN(putnote)(dst, off, "FreeBSD", NT_PRPSINFO, psinfo, 1216 sizeof *psinfo); 1217 1218 /* 1219 * To have the debugger select the right thread (LWP) as the initial 1220 * thread, we dump the state of the thread passed to us in td first. 1221 * This is the thread that causes the core dump and thus likely to 1222 * be the right thread one wants to have selected in the debugger. 1223 */ 1224 thr = td; 1225 while (thr != NULL) { 1226 if (dst != NULL) { 1227 status->pr_version = PRSTATUS_VERSION; 1228 status->pr_statussz = sizeof(elf_prstatus_t); 1229 status->pr_gregsetsz = sizeof(elf_gregset_t); 1230 status->pr_fpregsetsz = sizeof(elf_fpregset_t); 1231 status->pr_osreldate = osreldate; 1232 status->pr_cursig = p->p_sig; 1233 status->pr_pid = thr->td_tid; 1234 #if defined(COMPAT_IA32) && __ELF_WORD_SIZE == 32 1235 fill_regs32(thr, &status->pr_reg); 1236 fill_fpregs32(thr, fpregset); 1237 #else 1238 fill_regs(thr, &status->pr_reg); 1239 fill_fpregs(thr, fpregset); 1240 #endif 1241 } 1242 __elfN(putnote)(dst, off, "FreeBSD", NT_PRSTATUS, status, 1243 sizeof *status); 1244 __elfN(putnote)(dst, off, "FreeBSD", NT_FPREGSET, fpregset, 1245 sizeof *fpregset); 1246 /* 1247 * Allow for MD specific notes, as well as any MD 1248 * specific preparations for writing MI notes. 1249 */ 1250 __elfN(dump_thread)(thr, dst, off); 1251 1252 thr = (thr == td) ? TAILQ_FIRST(&p->p_threads) : 1253 TAILQ_NEXT(thr, td_plist); 1254 if (thr == td) 1255 thr = TAILQ_NEXT(thr, td_plist); 1256 } 1257 1258 notesz = *off - noteoff; 1259 1260 if (dst != NULL) 1261 free(tempdata, M_TEMP); 1262 1263 /* Align up to a page boundary for the program segments. */ 1264 *off = round_page(*off); 1265 1266 if (dst != NULL) { 1267 Elf_Ehdr *ehdr; 1268 Elf_Phdr *phdr; 1269 struct phdr_closure phc; 1270 1271 /* 1272 * Fill in the ELF header. 1273 */ 1274 ehdr = (Elf_Ehdr *)((char *)dst + ehoff); 1275 ehdr->e_ident[EI_MAG0] = ELFMAG0; 1276 ehdr->e_ident[EI_MAG1] = ELFMAG1; 1277 ehdr->e_ident[EI_MAG2] = ELFMAG2; 1278 ehdr->e_ident[EI_MAG3] = ELFMAG3; 1279 ehdr->e_ident[EI_CLASS] = ELF_CLASS; 1280 ehdr->e_ident[EI_DATA] = ELF_DATA; 1281 ehdr->e_ident[EI_VERSION] = EV_CURRENT; 1282 ehdr->e_ident[EI_OSABI] = ELFOSABI_FREEBSD; 1283 ehdr->e_ident[EI_ABIVERSION] = 0; 1284 ehdr->e_ident[EI_PAD] = 0; 1285 ehdr->e_type = ET_CORE; 1286 #if defined(COMPAT_IA32) && __ELF_WORD_SIZE == 32 1287 ehdr->e_machine = EM_386; 1288 #else 1289 ehdr->e_machine = ELF_ARCH; 1290 #endif 1291 ehdr->e_version = EV_CURRENT; 1292 ehdr->e_entry = 0; 1293 ehdr->e_phoff = phoff; 1294 ehdr->e_flags = 0; 1295 ehdr->e_ehsize = sizeof(Elf_Ehdr); 1296 ehdr->e_phentsize = sizeof(Elf_Phdr); 1297 ehdr->e_phnum = numsegs + 1; 1298 ehdr->e_shentsize = sizeof(Elf_Shdr); 1299 ehdr->e_shnum = 0; 1300 ehdr->e_shstrndx = SHN_UNDEF; 1301 1302 /* 1303 * Fill in the program header entries. 1304 */ 1305 phdr = (Elf_Phdr *)((char *)dst + phoff); 1306 1307 /* The note segement. */ 1308 phdr->p_type = PT_NOTE; 1309 phdr->p_offset = noteoff; 1310 phdr->p_vaddr = 0; 1311 phdr->p_paddr = 0; 1312 phdr->p_filesz = notesz; 1313 phdr->p_memsz = 0; 1314 phdr->p_flags = 0; 1315 phdr->p_align = 0; 1316 phdr++; 1317 1318 /* All the writable segments from the program. */ 1319 phc.phdr = phdr; 1320 phc.offset = *off; 1321 each_writable_segment(td, cb_put_phdr, &phc); 1322 } 1323 } 1324 1325 static void 1326 __elfN(putnote)(void *dst, size_t *off, const char *name, int type, 1327 const void *desc, size_t descsz) 1328 { 1329 Elf_Note note; 1330 1331 note.n_namesz = strlen(name) + 1; 1332 note.n_descsz = descsz; 1333 note.n_type = type; 1334 if (dst != NULL) 1335 bcopy(¬e, (char *)dst + *off, sizeof note); 1336 *off += sizeof note; 1337 if (dst != NULL) 1338 bcopy(name, (char *)dst + *off, note.n_namesz); 1339 *off += roundup2(note.n_namesz, sizeof(Elf_Size)); 1340 if (dst != NULL) 1341 bcopy(desc, (char *)dst + *off, note.n_descsz); 1342 *off += roundup2(note.n_descsz, sizeof(Elf_Size)); 1343 } 1344 1345 /* 1346 * Tell kern_execve.c about it, with a little help from the linker. 1347 */ 1348 static struct execsw __elfN(execsw) = { 1349 __CONCAT(exec_, __elfN(imgact)), 1350 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) 1351 }; 1352 EXEC_SET(__CONCAT(elf, __ELF_WORD_SIZE), __elfN(execsw)); 1353