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 <sys/param.h> 35 #include <sys/exec.h> 36 #include <sys/fcntl.h> 37 #include <sys/imgact.h> 38 #include <sys/imgact_elf.h> 39 #include <sys/kernel.h> 40 #include <sys/lock.h> 41 #include <sys/malloc.h> 42 #include <sys/mutex.h> 43 #include <sys/mman.h> 44 #include <sys/namei.h> 45 #include <sys/pioctl.h> 46 #include <sys/proc.h> 47 #include <sys/procfs.h> 48 #include <sys/resourcevar.h> 49 #include <sys/systm.h> 50 #include <sys/signalvar.h> 51 #include <sys/stat.h> 52 #include <sys/sx.h> 53 #include <sys/syscall.h> 54 #include <sys/sysctl.h> 55 #include <sys/sysent.h> 56 #include <sys/vnode.h> 57 58 #include <vm/vm.h> 59 #include <vm/vm_kern.h> 60 #include <vm/vm_param.h> 61 #include <vm/pmap.h> 62 #include <vm/vm_map.h> 63 #include <vm/vm_object.h> 64 #include <vm/vm_extern.h> 65 66 #include <machine/elf.h> 67 #include <machine/md_var.h> 68 69 #define OLD_EI_BRAND 8 70 71 static int __elfN(check_header)(const Elf_Ehdr *hdr); 72 static Elf_Brandinfo *__elfN(get_brandinfo)(const Elf_Ehdr *hdr, 73 const char *interp); 74 static int __elfN(load_file)(struct proc *p, const char *file, u_long *addr, 75 u_long *entry, size_t pagesize); 76 static int __elfN(load_section)(struct proc *p, 77 struct vmspace *vmspace, struct vnode *vp, vm_object_t object, 78 vm_offset_t offset, caddr_t vmaddr, size_t memsz, size_t filsz, 79 vm_prot_t prot, size_t pagesize); 80 static int __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp); 81 82 SYSCTL_NODE(_kern, OID_AUTO, __CONCAT(elf, __ELF_WORD_SIZE), CTLFLAG_RW, 0, 83 ""); 84 85 int __elfN(fallback_brand) = -1; 86 SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO, 87 fallback_brand, CTLFLAG_RW, &__elfN(fallback_brand), 0, 88 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) " brand of last resort"); 89 TUNABLE_INT("kern.elf" __XSTRING(__ELF_WORD_SIZE) ".fallback_brand", 90 &__elfN(fallback_brand)); 91 92 static int elf_trace = 0; 93 SYSCTL_INT(_debug, OID_AUTO, __elfN(trace), CTLFLAG_RW, &elf_trace, 0, ""); 94 95 static int elf_legacy_coredump = 0; 96 SYSCTL_INT(_debug, OID_AUTO, __elfN(legacy_coredump), CTLFLAG_RW, 97 &elf_legacy_coredump, 0, ""); 98 99 static Elf_Brandinfo *elf_brand_list[MAX_BRANDS]; 100 101 int 102 __elfN(insert_brand_entry)(Elf_Brandinfo *entry) 103 { 104 int i; 105 106 for (i = 0; i < MAX_BRANDS; i++) { 107 if (elf_brand_list[i] == NULL) { 108 elf_brand_list[i] = entry; 109 break; 110 } 111 } 112 if (i == MAX_BRANDS) 113 return (-1); 114 return (0); 115 } 116 117 int 118 __elfN(remove_brand_entry)(Elf_Brandinfo *entry) 119 { 120 int i; 121 122 for (i = 0; i < MAX_BRANDS; i++) { 123 if (elf_brand_list[i] == entry) { 124 elf_brand_list[i] = NULL; 125 break; 126 } 127 } 128 if (i == MAX_BRANDS) 129 return (-1); 130 return (0); 131 } 132 133 int 134 __elfN(brand_inuse)(Elf_Brandinfo *entry) 135 { 136 struct proc *p; 137 int rval = FALSE; 138 139 sx_slock(&allproc_lock); 140 LIST_FOREACH(p, &allproc, p_list) { 141 if (p->p_sysent == entry->sysvec) { 142 rval = TRUE; 143 break; 144 } 145 } 146 sx_sunlock(&allproc_lock); 147 148 return (rval); 149 } 150 151 static Elf_Brandinfo * 152 __elfN(get_brandinfo)(const Elf_Ehdr *hdr, const char *interp) 153 { 154 Elf_Brandinfo *bi; 155 int i; 156 157 /* 158 * We support three types of branding -- (1) the ELF EI_OSABI field 159 * that SCO added to the ELF spec, (2) FreeBSD 3.x's traditional string 160 * branding w/in the ELF header, and (3) path of the `interp_path' 161 * field. We should also look for an ".note.ABI-tag" ELF section now 162 * in all Linux ELF binaries, FreeBSD 4.1+, and some NetBSD ones. 163 */ 164 165 /* If the executable has a brand, search for it in the brand list. */ 166 for (i = 0; i < MAX_BRANDS; i++) { 167 bi = elf_brand_list[i]; 168 if (bi != NULL && hdr->e_machine == bi->machine && 169 (hdr->e_ident[EI_OSABI] == bi->brand || 170 strncmp((const char *)&hdr->e_ident[OLD_EI_BRAND], 171 bi->compat_3_brand, strlen(bi->compat_3_brand)) == 0)) 172 return (bi); 173 } 174 175 /* Lacking a known brand, search for a recognized interpreter. */ 176 if (interp != NULL) { 177 for (i = 0; i < MAX_BRANDS; i++) { 178 bi = elf_brand_list[i]; 179 if (bi != NULL && hdr->e_machine == bi->machine && 180 strcmp(interp, bi->interp_path) == 0) 181 return (bi); 182 } 183 } 184 185 /* Lacking a recognized interpreter, try the default brand */ 186 for (i = 0; i < MAX_BRANDS; i++) { 187 bi = elf_brand_list[i]; 188 if (bi != NULL && hdr->e_machine == bi->machine && 189 __elfN(fallback_brand) == bi->brand) 190 return (bi); 191 } 192 return (NULL); 193 } 194 195 static int 196 __elfN(check_header)(const Elf_Ehdr *hdr) 197 { 198 Elf_Brandinfo *bi; 199 int i; 200 201 if (!IS_ELF(*hdr) || 202 hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS || 203 hdr->e_ident[EI_DATA] != ELF_TARG_DATA || 204 hdr->e_ident[EI_VERSION] != EV_CURRENT || 205 hdr->e_phentsize != sizeof(Elf_Phdr) || 206 hdr->e_version != ELF_TARG_VER) 207 return (ENOEXEC); 208 209 /* 210 * Make sure we have at least one brand for this machine. 211 */ 212 213 for (i = 0; i < MAX_BRANDS; i++) { 214 bi = elf_brand_list[i]; 215 if (bi != NULL && bi->machine == hdr->e_machine) 216 break; 217 } 218 if (i == MAX_BRANDS) 219 return (ENOEXEC); 220 221 return (0); 222 } 223 224 static int 225 __elfN(map_partial)(vm_map_t map, vm_object_t object, vm_ooffset_t offset, 226 vm_offset_t start, vm_offset_t end, vm_prot_t prot, 227 vm_prot_t max) 228 { 229 int error, rv; 230 vm_offset_t off; 231 vm_offset_t data_buf = 0; 232 233 /* 234 * Create the page if it doesn't exist yet. Ignore errors. 235 */ 236 vm_map_lock(map); 237 vm_map_insert(map, NULL, 0, trunc_page(start), round_page(end), max, 238 max, 0); 239 vm_map_unlock(map); 240 241 /* 242 * Find the page from the underlying object. 243 */ 244 if (object) { 245 vm_object_reference(object); 246 rv = vm_map_find(exec_map, 247 object, 248 trunc_page(offset), 249 &data_buf, 250 PAGE_SIZE, 251 TRUE, 252 VM_PROT_READ, 253 VM_PROT_ALL, 254 MAP_COPY_ON_WRITE | MAP_PREFAULT_PARTIAL); 255 if (rv != KERN_SUCCESS) { 256 vm_object_deallocate(object); 257 return (rv); 258 } 259 260 off = offset - trunc_page(offset); 261 error = copyout((caddr_t)data_buf + off, (caddr_t)start, 262 end - start); 263 vm_map_remove(exec_map, data_buf, data_buf + PAGE_SIZE); 264 if (error) { 265 return (KERN_FAILURE); 266 } 267 } 268 269 return (KERN_SUCCESS); 270 } 271 272 static int 273 __elfN(map_insert)(vm_map_t map, vm_object_t object, vm_ooffset_t offset, 274 vm_offset_t start, vm_offset_t end, vm_prot_t prot, 275 vm_prot_t max, int cow) 276 { 277 vm_offset_t data_buf, off; 278 vm_size_t sz; 279 int error, rv; 280 281 if (start != trunc_page(start)) { 282 rv = __elfN(map_partial)(map, object, offset, start, 283 round_page(start), prot, max); 284 if (rv) 285 return (rv); 286 offset += round_page(start) - start; 287 start = round_page(start); 288 } 289 if (end != round_page(end)) { 290 rv = __elfN(map_partial)(map, object, offset + 291 trunc_page(end) - start, trunc_page(end), end, prot, max); 292 if (rv) 293 return (rv); 294 end = trunc_page(end); 295 } 296 if (end > start) { 297 if (offset & PAGE_MASK) { 298 /* 299 * The mapping is not page aligned. This means we have 300 * to copy the data. Sigh. 301 */ 302 rv = vm_map_find(map, 0, 0, &start, end - start, 303 FALSE, prot, max, 0); 304 if (rv) 305 return (rv); 306 data_buf = 0; 307 while (start < end) { 308 vm_object_reference(object); 309 rv = vm_map_find(exec_map, 310 object, 311 trunc_page(offset), 312 &data_buf, 313 2 * PAGE_SIZE, 314 TRUE, 315 VM_PROT_READ, 316 VM_PROT_ALL, 317 (MAP_COPY_ON_WRITE 318 | MAP_PREFAULT_PARTIAL)); 319 if (rv != KERN_SUCCESS) { 320 vm_object_deallocate(object); 321 return (rv); 322 } 323 off = offset - trunc_page(offset); 324 sz = end - start; 325 if (sz > PAGE_SIZE) 326 sz = PAGE_SIZE; 327 error = copyout((caddr_t)data_buf + off, 328 (caddr_t)start, sz); 329 vm_map_remove(exec_map, data_buf, 330 data_buf + 2 * PAGE_SIZE); 331 if (error) { 332 return (KERN_FAILURE); 333 } 334 start += sz; 335 } 336 rv = KERN_SUCCESS; 337 } else { 338 vm_map_lock(map); 339 rv = vm_map_insert(map, object, offset, start, end, 340 prot, max, cow); 341 vm_map_unlock(map); 342 } 343 return (rv); 344 } else { 345 return (KERN_SUCCESS); 346 } 347 } 348 349 static int 350 __elfN(load_section)(struct proc *p, struct vmspace *vmspace, 351 struct vnode *vp, vm_object_t object, vm_offset_t offset, 352 caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot, 353 size_t pagesize) 354 { 355 size_t map_len; 356 vm_offset_t map_addr; 357 int error, rv, cow; 358 size_t copy_len; 359 vm_offset_t file_addr; 360 vm_offset_t data_buf = 0; 361 362 GIANT_REQUIRED; 363 364 error = 0; 365 366 /* 367 * It's necessary to fail if the filsz + offset taken from the 368 * header is greater than the actual file pager object's size. 369 * If we were to allow this, then the vm_map_find() below would 370 * walk right off the end of the file object and into the ether. 371 * 372 * While I'm here, might as well check for something else that 373 * is invalid: filsz cannot be greater than memsz. 374 */ 375 if ((off_t)filsz + offset > object->un_pager.vnp.vnp_size || 376 filsz > memsz) { 377 uprintf("elf_load_section: truncated ELF file\n"); 378 return (ENOEXEC); 379 } 380 381 #define trunc_page_ps(va, ps) ((va) & ~(ps - 1)) 382 #define round_page_ps(va, ps) (((va) + (ps - 1)) & ~(ps - 1)) 383 384 map_addr = trunc_page_ps((vm_offset_t)vmaddr, pagesize); 385 file_addr = trunc_page_ps(offset, pagesize); 386 387 /* 388 * We have two choices. We can either clear the data in the last page 389 * of an oversized mapping, or we can start the anon mapping a page 390 * early and copy the initialized data into that first page. We 391 * choose the second.. 392 */ 393 if (memsz > filsz) 394 map_len = trunc_page_ps(offset + filsz, pagesize) - file_addr; 395 else 396 map_len = round_page_ps(offset + filsz, pagesize) - file_addr; 397 398 if (map_len != 0) { 399 vm_object_reference(object); 400 401 /* cow flags: don't dump readonly sections in core */ 402 cow = MAP_COPY_ON_WRITE | MAP_PREFAULT | 403 (prot & VM_PROT_WRITE ? 0 : MAP_DISABLE_COREDUMP); 404 405 rv = __elfN(map_insert)(&vmspace->vm_map, 406 object, 407 file_addr, /* file offset */ 408 map_addr, /* virtual start */ 409 map_addr + map_len,/* virtual end */ 410 prot, 411 VM_PROT_ALL, 412 cow); 413 if (rv != KERN_SUCCESS) { 414 vm_object_deallocate(object); 415 return (EINVAL); 416 } 417 418 /* we can stop now if we've covered it all */ 419 if (memsz == filsz) { 420 return (0); 421 } 422 } 423 424 425 /* 426 * We have to get the remaining bit of the file into the first part 427 * of the oversized map segment. This is normally because the .data 428 * segment in the file is extended to provide bss. It's a neat idea 429 * to try and save a page, but it's a pain in the behind to implement. 430 */ 431 copy_len = (offset + filsz) - trunc_page_ps(offset + filsz, pagesize); 432 map_addr = trunc_page_ps((vm_offset_t)vmaddr + filsz, pagesize); 433 map_len = round_page_ps((vm_offset_t)vmaddr + memsz, pagesize) - 434 map_addr; 435 436 /* This had damn well better be true! */ 437 if (map_len != 0) { 438 rv = __elfN(map_insert)(&vmspace->vm_map, NULL, 0, map_addr, 439 map_addr + map_len, VM_PROT_ALL, VM_PROT_ALL, 0); 440 if (rv != KERN_SUCCESS) { 441 return (EINVAL); 442 } 443 } 444 445 if (copy_len != 0) { 446 vm_offset_t off; 447 vm_object_reference(object); 448 rv = vm_map_find(exec_map, 449 object, 450 trunc_page(offset + filsz), 451 &data_buf, 452 PAGE_SIZE, 453 TRUE, 454 VM_PROT_READ, 455 VM_PROT_ALL, 456 MAP_COPY_ON_WRITE | MAP_PREFAULT_PARTIAL); 457 if (rv != KERN_SUCCESS) { 458 vm_object_deallocate(object); 459 return (EINVAL); 460 } 461 462 /* send the page fragment to user space */ 463 off = trunc_page_ps(offset + filsz, pagesize) - 464 trunc_page(offset + filsz); 465 error = copyout((caddr_t)data_buf + off, (caddr_t)map_addr, 466 copy_len); 467 vm_map_remove(exec_map, data_buf, data_buf + PAGE_SIZE); 468 if (error) { 469 return (error); 470 } 471 } 472 473 /* 474 * set it to the specified protection. 475 * XXX had better undo the damage from pasting over the cracks here! 476 */ 477 vm_map_protect(&vmspace->vm_map, trunc_page(map_addr), 478 round_page(map_addr + map_len), prot, FALSE); 479 480 return (error); 481 } 482 483 /* 484 * Load the file "file" into memory. It may be either a shared object 485 * or an executable. 486 * 487 * The "addr" reference parameter is in/out. On entry, it specifies 488 * the address where a shared object should be loaded. If the file is 489 * an executable, this value is ignored. On exit, "addr" specifies 490 * where the file was actually loaded. 491 * 492 * The "entry" reference parameter is out only. On exit, it specifies 493 * the entry point for the loaded file. 494 */ 495 static int 496 __elfN(load_file)(struct proc *p, const char *file, u_long *addr, 497 u_long *entry, size_t pagesize) 498 { 499 struct { 500 struct nameidata nd; 501 struct vattr attr; 502 struct image_params image_params; 503 } *tempdata; 504 const Elf_Ehdr *hdr = NULL; 505 const Elf_Phdr *phdr = NULL; 506 struct nameidata *nd; 507 struct vmspace *vmspace = p->p_vmspace; 508 struct vattr *attr; 509 struct image_params *imgp; 510 vm_prot_t prot; 511 u_long rbase; 512 u_long base_addr = 0; 513 int error, i, numsegs; 514 515 if (curthread->td_proc != p) 516 panic("elf_load_file - thread"); /* XXXKSE DIAGNOSTIC */ 517 518 tempdata = malloc(sizeof(*tempdata), M_TEMP, M_WAITOK); 519 nd = &tempdata->nd; 520 attr = &tempdata->attr; 521 imgp = &tempdata->image_params; 522 523 /* 524 * Initialize part of the common data 525 */ 526 imgp->proc = p; 527 imgp->userspace_argv = NULL; 528 imgp->userspace_envv = NULL; 529 imgp->attr = attr; 530 imgp->firstpage = NULL; 531 imgp->image_header = NULL; 532 imgp->object = NULL; 533 imgp->execlabel = NULL; 534 535 /* XXXKSE */ 536 NDINIT(nd, LOOKUP, LOCKLEAF|FOLLOW, UIO_SYSSPACE, file, curthread); 537 538 if ((error = namei(nd)) != 0) { 539 nd->ni_vp = NULL; 540 goto fail; 541 } 542 NDFREE(nd, NDF_ONLY_PNBUF); 543 imgp->vp = nd->ni_vp; 544 545 /* 546 * Check permissions, modes, uid, etc on the file, and "open" it. 547 */ 548 error = exec_check_permissions(imgp); 549 if (error) { 550 VOP_UNLOCK(nd->ni_vp, 0, curthread); /* XXXKSE */ 551 goto fail; 552 } 553 554 error = exec_map_first_page(imgp); 555 /* 556 * Also make certain that the interpreter stays the same, so set 557 * its VV_TEXT flag, too. 558 */ 559 if (error == 0) 560 nd->ni_vp->v_vflag |= VV_TEXT; 561 562 VOP_GETVOBJECT(nd->ni_vp, &imgp->object); 563 vm_object_reference(imgp->object); 564 565 VOP_UNLOCK(nd->ni_vp, 0, curthread); /* XXXKSE */ 566 if (error) 567 goto fail; 568 569 hdr = (const Elf_Ehdr *)imgp->image_header; 570 if ((error = __elfN(check_header)(hdr)) != 0) 571 goto fail; 572 if (hdr->e_type == ET_DYN) 573 rbase = *addr; 574 else if (hdr->e_type == ET_EXEC) 575 rbase = 0; 576 else { 577 error = ENOEXEC; 578 goto fail; 579 } 580 581 /* Only support headers that fit within first page for now */ 582 /* (multiplication of two Elf_Half fields will not overflow) */ 583 if ((hdr->e_phoff > PAGE_SIZE) || 584 (hdr->e_phentsize * hdr->e_phnum) > PAGE_SIZE - hdr->e_phoff) { 585 error = ENOEXEC; 586 goto fail; 587 } 588 589 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 590 591 for (i = 0, numsegs = 0; i < hdr->e_phnum; i++) { 592 if (phdr[i].p_type == PT_LOAD) { /* Loadable segment */ 593 prot = 0; 594 if (phdr[i].p_flags & PF_X) 595 prot |= VM_PROT_EXECUTE; 596 if (phdr[i].p_flags & PF_W) 597 prot |= VM_PROT_WRITE; 598 if (phdr[i].p_flags & PF_R) 599 prot |= VM_PROT_READ; 600 601 if ((error = __elfN(load_section)(p, vmspace, 602 nd->ni_vp, imgp->object, phdr[i].p_offset, 603 (caddr_t)(uintptr_t)phdr[i].p_vaddr + rbase, 604 phdr[i].p_memsz, phdr[i].p_filesz, prot, 605 pagesize)) != 0) 606 goto fail; 607 /* 608 * Establish the base address if this is the 609 * first segment. 610 */ 611 if (numsegs == 0) 612 base_addr = trunc_page(phdr[i].p_vaddr + 613 rbase); 614 numsegs++; 615 } 616 } 617 *addr = base_addr; 618 *entry = (unsigned long)hdr->e_entry + rbase; 619 620 fail: 621 if (imgp->firstpage) 622 exec_unmap_first_page(imgp); 623 if (imgp->object) 624 vm_object_deallocate(imgp->object); 625 626 if (nd->ni_vp) 627 vrele(nd->ni_vp); 628 629 free(tempdata, M_TEMP); 630 631 return (error); 632 } 633 634 static int 635 __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp) 636 { 637 const Elf_Ehdr *hdr = (const Elf_Ehdr *)imgp->image_header; 638 const Elf_Phdr *phdr; 639 Elf_Auxargs *elf_auxargs = NULL; 640 struct vmspace *vmspace; 641 vm_prot_t prot; 642 u_long text_size = 0, data_size = 0, total_size = 0; 643 u_long text_addr = 0, data_addr = 0; 644 u_long seg_size, seg_addr; 645 u_long addr, entry = 0, proghdr = 0; 646 int error, i; 647 const char *interp = NULL; 648 Elf_Brandinfo *brand_info; 649 char *path; 650 struct thread *td = curthread; 651 struct sysentvec *sv; 652 653 GIANT_REQUIRED; 654 655 /* 656 * Do we have a valid ELF header ? 657 * 658 * Only allow ET_EXEC & ET_DYN here, reject ET_DYN later 659 * if particular brand doesn't support it. 660 */ 661 if (__elfN(check_header)(hdr) != 0 || 662 (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN)) 663 return (-1); 664 665 /* 666 * From here on down, we return an errno, not -1, as we've 667 * detected an ELF file. 668 */ 669 670 if ((hdr->e_phoff > PAGE_SIZE) || 671 (hdr->e_phoff + hdr->e_phentsize * hdr->e_phnum) > PAGE_SIZE) { 672 /* Only support headers in first page for now */ 673 return (ENOEXEC); 674 } 675 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 676 677 /* 678 * From this point on, we may have resources that need to be freed. 679 */ 680 681 VOP_UNLOCK(imgp->vp, 0, td); 682 683 for (i = 0; i < hdr->e_phnum; i++) { 684 switch (phdr[i].p_type) { 685 case PT_INTERP: /* Path to interpreter */ 686 if (phdr[i].p_filesz > MAXPATHLEN || 687 phdr[i].p_offset + phdr[i].p_filesz > PAGE_SIZE) { 688 error = ENOEXEC; 689 goto fail; 690 } 691 interp = imgp->image_header + phdr[i].p_offset; 692 break; 693 default: 694 break; 695 } 696 } 697 698 brand_info = __elfN(get_brandinfo)(hdr, interp); 699 if (brand_info == NULL) { 700 uprintf("ELF binary type \"%u\" not known.\n", 701 hdr->e_ident[EI_OSABI]); 702 error = ENOEXEC; 703 goto fail; 704 } 705 if (hdr->e_type == ET_DYN && brand_info->brand != ELFOSABI_LINUX) { 706 error = ENOEXEC; 707 goto fail; 708 } 709 sv = brand_info->sysvec; 710 if (interp != NULL && brand_info->interp_newpath != NULL) 711 interp = brand_info->interp_newpath; 712 713 if ((error = exec_extract_strings(imgp)) != 0) 714 goto fail; 715 716 exec_new_vmspace(imgp, sv); 717 718 vmspace = imgp->proc->p_vmspace; 719 720 for (i = 0; i < hdr->e_phnum; i++) { 721 switch (phdr[i].p_type) { 722 case PT_LOAD: /* Loadable segment */ 723 prot = 0; 724 if (phdr[i].p_flags & PF_X) 725 prot |= VM_PROT_EXECUTE; 726 if (phdr[i].p_flags & PF_W) 727 prot |= VM_PROT_WRITE; 728 if (phdr[i].p_flags & PF_R) 729 prot |= VM_PROT_READ; 730 731 #if defined(__ia64__) && __ELF_WORD_SIZE == 32 && defined(IA32_ME_HARDER) 732 /* 733 * Some x86 binaries assume read == executable, 734 * notably the M3 runtime and therefore cvsup 735 */ 736 if (prot & VM_PROT_READ) 737 prot |= VM_PROT_EXECUTE; 738 #endif 739 740 if ((error = __elfN(load_section)(imgp->proc, vmspace, 741 imgp->vp, imgp->object, phdr[i].p_offset, 742 (caddr_t)(uintptr_t)phdr[i].p_vaddr, 743 phdr[i].p_memsz, phdr[i].p_filesz, prot, 744 sv->sv_pagesize)) != 0) 745 goto fail; 746 747 /* 748 * If this segment contains the program headers, 749 * remember their virtual address for the AT_PHDR 750 * aux entry. Static binaries don't usually include 751 * a PT_PHDR entry. 752 */ 753 if (phdr[i].p_offset == 0 && 754 hdr->e_phoff + hdr->e_phnum * hdr->e_phentsize 755 <= phdr[i].p_filesz) 756 proghdr = phdr[i].p_vaddr + hdr->e_phoff; 757 758 seg_addr = trunc_page(phdr[i].p_vaddr); 759 seg_size = round_page(phdr[i].p_memsz + 760 phdr[i].p_vaddr - seg_addr); 761 762 /* 763 * Is this .text or .data? We can't use 764 * VM_PROT_WRITE or VM_PROT_EXEC, it breaks the 765 * alpha terribly and possibly does other bad 766 * things so we stick to the old way of figuring 767 * it out: If the segment contains the program 768 * entry point, it's a text segment, otherwise it 769 * is a data segment. 770 * 771 * Note that obreak() assumes that data_addr + 772 * data_size == end of data load area, and the ELF 773 * file format expects segments to be sorted by 774 * address. If multiple data segments exist, the 775 * last one will be used. 776 */ 777 if (hdr->e_entry >= phdr[i].p_vaddr && 778 hdr->e_entry < (phdr[i].p_vaddr + 779 phdr[i].p_memsz)) { 780 text_size = seg_size; 781 text_addr = seg_addr; 782 entry = (u_long)hdr->e_entry; 783 } else { 784 data_size = seg_size; 785 data_addr = seg_addr; 786 } 787 total_size += seg_size; 788 break; 789 case PT_PHDR: /* Program header table info */ 790 proghdr = phdr[i].p_vaddr; 791 break; 792 default: 793 break; 794 } 795 } 796 797 if (data_addr == 0 && data_size == 0) { 798 data_addr = text_addr; 799 data_size = text_size; 800 } 801 802 /* 803 * Check limits. It should be safe to check the 804 * limits after loading the segments since we do 805 * not actually fault in all the segments pages. 806 */ 807 PROC_LOCK(imgp->proc); 808 if (data_size > lim_cur(imgp->proc, RLIMIT_DATA) || 809 text_size > maxtsiz || 810 total_size > lim_cur(imgp->proc, RLIMIT_VMEM)) { 811 PROC_UNLOCK(imgp->proc); 812 error = ENOMEM; 813 goto fail; 814 } 815 816 vmspace->vm_tsize = text_size >> PAGE_SHIFT; 817 vmspace->vm_taddr = (caddr_t)(uintptr_t)text_addr; 818 vmspace->vm_dsize = data_size >> PAGE_SHIFT; 819 vmspace->vm_daddr = (caddr_t)(uintptr_t)data_addr; 820 821 /* 822 * We load the dynamic linker where a userland call 823 * to mmap(0, ...) would put it. The rationale behind this 824 * calculation is that it leaves room for the heap to grow to 825 * its maximum allowed size. 826 */ 827 addr = round_page((vm_offset_t)imgp->proc->p_vmspace->vm_daddr + 828 lim_max(imgp->proc, RLIMIT_DATA)); 829 PROC_UNLOCK(imgp->proc); 830 831 imgp->entry_addr = entry; 832 833 imgp->proc->p_sysent = sv; 834 if (interp != NULL && brand_info->emul_path != NULL && 835 brand_info->emul_path[0] != '\0') { 836 path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 837 snprintf(path, MAXPATHLEN, "%s%s", brand_info->emul_path, 838 interp); 839 error = __elfN(load_file)(imgp->proc, path, &addr, 840 &imgp->entry_addr, sv->sv_pagesize); 841 free(path, M_TEMP); 842 if (error == 0) 843 interp = NULL; 844 } 845 if (interp != NULL) { 846 error = __elfN(load_file)(imgp->proc, interp, &addr, 847 &imgp->entry_addr, sv->sv_pagesize); 848 if (error != 0) { 849 uprintf("ELF interpreter %s not found\n", interp); 850 goto fail; 851 } 852 } 853 854 /* 855 * Construct auxargs table (used by the fixup routine) 856 */ 857 elf_auxargs = malloc(sizeof(Elf_Auxargs), M_TEMP, M_WAITOK); 858 elf_auxargs->execfd = -1; 859 elf_auxargs->phdr = proghdr; 860 elf_auxargs->phent = hdr->e_phentsize; 861 elf_auxargs->phnum = hdr->e_phnum; 862 elf_auxargs->pagesz = PAGE_SIZE; 863 elf_auxargs->base = addr; 864 elf_auxargs->flags = 0; 865 elf_auxargs->entry = entry; 866 elf_auxargs->trace = elf_trace; 867 868 imgp->auxargs = elf_auxargs; 869 imgp->interpreted = 0; 870 871 fail: 872 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY, td); 873 return (error); 874 } 875 876 #define suword __CONCAT(suword, __ELF_WORD_SIZE) 877 878 int 879 __elfN(freebsd_fixup)(register_t **stack_base, struct image_params *imgp) 880 { 881 Elf_Auxargs *args = (Elf_Auxargs *)imgp->auxargs; 882 Elf_Addr *base; 883 Elf_Addr *pos; 884 885 base = (Elf_Addr *)*stack_base; 886 pos = base + (imgp->argc + imgp->envc + 2); 887 888 if (args->trace) { 889 AUXARGS_ENTRY(pos, AT_DEBUG, 1); 890 } 891 if (args->execfd != -1) { 892 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd); 893 } 894 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr); 895 AUXARGS_ENTRY(pos, AT_PHENT, args->phent); 896 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum); 897 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz); 898 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags); 899 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry); 900 AUXARGS_ENTRY(pos, AT_BASE, args->base); 901 AUXARGS_ENTRY(pos, AT_NULL, 0); 902 903 free(imgp->auxargs, M_TEMP); 904 imgp->auxargs = NULL; 905 906 base--; 907 suword(base, (long)imgp->argc); 908 *stack_base = (register_t *)base; 909 return (0); 910 } 911 912 /* 913 * Code for generating ELF core dumps. 914 */ 915 916 typedef void (*segment_callback)(vm_map_entry_t, void *); 917 918 /* Closure for cb_put_phdr(). */ 919 struct phdr_closure { 920 Elf_Phdr *phdr; /* Program header to fill in */ 921 Elf_Off offset; /* Offset of segment in core file */ 922 }; 923 924 /* Closure for cb_size_segment(). */ 925 struct sseg_closure { 926 int count; /* Count of writable segments. */ 927 size_t size; /* Total size of all writable segments. */ 928 }; 929 930 static void cb_put_phdr(vm_map_entry_t, void *); 931 static void cb_size_segment(vm_map_entry_t, void *); 932 static void each_writable_segment(struct thread *, segment_callback, void *); 933 static int __elfN(corehdr)(struct thread *, struct vnode *, struct ucred *, 934 int, void *, size_t); 935 static void __elfN(puthdr)(struct thread *, void *, size_t *, int); 936 static void __elfN(putnote)(void *, size_t *, const char *, int, 937 const void *, size_t); 938 939 extern int osreldate; 940 941 int 942 __elfN(coredump)(td, vp, limit) 943 struct thread *td; 944 struct vnode *vp; 945 off_t limit; 946 { 947 struct ucred *cred = td->td_ucred; 948 int error = 0; 949 struct sseg_closure seginfo; 950 void *hdr; 951 size_t hdrsize; 952 953 /* Size the program segments. */ 954 seginfo.count = 0; 955 seginfo.size = 0; 956 each_writable_segment(td, cb_size_segment, &seginfo); 957 958 /* 959 * Calculate the size of the core file header area by making 960 * a dry run of generating it. Nothing is written, but the 961 * size is calculated. 962 */ 963 hdrsize = 0; 964 __elfN(puthdr)(td, (void *)NULL, &hdrsize, seginfo.count); 965 966 if (hdrsize + seginfo.size >= limit) 967 return (EFAULT); 968 969 /* 970 * Allocate memory for building the header, fill it up, 971 * and write it out. 972 */ 973 hdr = malloc(hdrsize, M_TEMP, M_WAITOK); 974 if (hdr == NULL) { 975 return (EINVAL); 976 } 977 error = __elfN(corehdr)(td, vp, cred, seginfo.count, hdr, hdrsize); 978 979 /* Write the contents of all of the writable segments. */ 980 if (error == 0) { 981 Elf_Phdr *php; 982 off_t offset; 983 int i; 984 985 php = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr)) + 1; 986 offset = hdrsize; 987 for (i = 0; i < seginfo.count; i++) { 988 error = vn_rdwr_inchunks(UIO_WRITE, vp, 989 (caddr_t)(uintptr_t)php->p_vaddr, 990 php->p_filesz, offset, UIO_USERSPACE, 991 IO_UNIT | IO_DIRECT, cred, NOCRED, NULL, 992 curthread); /* XXXKSE */ 993 if (error != 0) 994 break; 995 offset += php->p_filesz; 996 php++; 997 } 998 } 999 free(hdr, M_TEMP); 1000 1001 return (error); 1002 } 1003 1004 /* 1005 * A callback for each_writable_segment() to write out the segment's 1006 * program header entry. 1007 */ 1008 static void 1009 cb_put_phdr(entry, closure) 1010 vm_map_entry_t entry; 1011 void *closure; 1012 { 1013 struct phdr_closure *phc = (struct phdr_closure *)closure; 1014 Elf_Phdr *phdr = phc->phdr; 1015 1016 phc->offset = round_page(phc->offset); 1017 1018 phdr->p_type = PT_LOAD; 1019 phdr->p_offset = phc->offset; 1020 phdr->p_vaddr = entry->start; 1021 phdr->p_paddr = 0; 1022 phdr->p_filesz = phdr->p_memsz = entry->end - entry->start; 1023 phdr->p_align = PAGE_SIZE; 1024 phdr->p_flags = 0; 1025 if (entry->protection & VM_PROT_READ) 1026 phdr->p_flags |= PF_R; 1027 if (entry->protection & VM_PROT_WRITE) 1028 phdr->p_flags |= PF_W; 1029 if (entry->protection & VM_PROT_EXECUTE) 1030 phdr->p_flags |= PF_X; 1031 1032 phc->offset += phdr->p_filesz; 1033 phc->phdr++; 1034 } 1035 1036 /* 1037 * A callback for each_writable_segment() to gather information about 1038 * the number of segments and their total size. 1039 */ 1040 static void 1041 cb_size_segment(entry, closure) 1042 vm_map_entry_t entry; 1043 void *closure; 1044 { 1045 struct sseg_closure *ssc = (struct sseg_closure *)closure; 1046 1047 ssc->count++; 1048 ssc->size += entry->end - entry->start; 1049 } 1050 1051 /* 1052 * For each writable segment in the process's memory map, call the given 1053 * function with a pointer to the map entry and some arbitrary 1054 * caller-supplied data. 1055 */ 1056 static void 1057 each_writable_segment(td, func, closure) 1058 struct thread *td; 1059 segment_callback func; 1060 void *closure; 1061 { 1062 struct proc *p = td->td_proc; 1063 vm_map_t map = &p->p_vmspace->vm_map; 1064 vm_map_entry_t entry; 1065 1066 for (entry = map->header.next; entry != &map->header; 1067 entry = entry->next) { 1068 vm_object_t obj; 1069 1070 /* 1071 * Don't dump inaccessible mappings, deal with legacy 1072 * coredump mode. 1073 * 1074 * Note that read-only segments related to the elf binary 1075 * are marked MAP_ENTRY_NOCOREDUMP now so we no longer 1076 * need to arbitrarily ignore such segments. 1077 */ 1078 if (elf_legacy_coredump) { 1079 if ((entry->protection & VM_PROT_RW) != VM_PROT_RW) 1080 continue; 1081 } else { 1082 if ((entry->protection & VM_PROT_ALL) == 0) 1083 continue; 1084 } 1085 1086 /* 1087 * Dont include memory segment in the coredump if 1088 * MAP_NOCORE is set in mmap(2) or MADV_NOCORE in 1089 * madvise(2). Do not dump submaps (i.e. parts of the 1090 * kernel map). 1091 */ 1092 if (entry->eflags & (MAP_ENTRY_NOCOREDUMP|MAP_ENTRY_IS_SUB_MAP)) 1093 continue; 1094 1095 if ((obj = entry->object.vm_object) == NULL) 1096 continue; 1097 1098 /* Find the deepest backing object. */ 1099 while (obj->backing_object != NULL) 1100 obj = obj->backing_object; 1101 1102 /* Ignore memory-mapped devices and such things. */ 1103 if (obj->type != OBJT_DEFAULT && 1104 obj->type != OBJT_SWAP && 1105 obj->type != OBJT_VNODE) 1106 continue; 1107 1108 (*func)(entry, closure); 1109 } 1110 } 1111 1112 /* 1113 * Write the core file header to the file, including padding up to 1114 * the page boundary. 1115 */ 1116 static int 1117 __elfN(corehdr)(td, vp, cred, numsegs, hdr, hdrsize) 1118 struct thread *td; 1119 struct vnode *vp; 1120 struct ucred *cred; 1121 int numsegs; 1122 size_t hdrsize; 1123 void *hdr; 1124 { 1125 size_t off; 1126 1127 /* Fill in the header. */ 1128 bzero(hdr, hdrsize); 1129 off = 0; 1130 __elfN(puthdr)(td, hdr, &off, numsegs); 1131 1132 /* Write it to the core file. */ 1133 return (vn_rdwr_inchunks(UIO_WRITE, vp, hdr, hdrsize, (off_t)0, 1134 UIO_SYSSPACE, IO_UNIT | IO_DIRECT, cred, NOCRED, NULL, 1135 td)); /* XXXKSE */ 1136 } 1137 1138 static void 1139 __elfN(puthdr)(struct thread *td, void *dst, size_t *off, int numsegs) 1140 { 1141 struct { 1142 prstatus_t status; 1143 prfpregset_t fpregset; 1144 prpsinfo_t psinfo; 1145 } *tempdata; 1146 prstatus_t *status; 1147 prfpregset_t *fpregset; 1148 prpsinfo_t *psinfo; 1149 struct proc *p; 1150 struct thread *thr; 1151 size_t ehoff, noteoff, notesz, phoff; 1152 1153 p = td->td_proc; 1154 1155 ehoff = *off; 1156 *off += sizeof(Elf_Ehdr); 1157 1158 phoff = *off; 1159 *off += (numsegs + 1) * sizeof(Elf_Phdr); 1160 1161 noteoff = *off; 1162 /* 1163 * Don't allocate space for the notes if we're just calculating 1164 * the size of the header. We also don't collect the data. 1165 */ 1166 if (dst != NULL) { 1167 tempdata = malloc(sizeof(*tempdata), M_TEMP, M_ZERO|M_WAITOK); 1168 status = &tempdata->status; 1169 fpregset = &tempdata->fpregset; 1170 psinfo = &tempdata->psinfo; 1171 } else { 1172 tempdata = NULL; 1173 status = NULL; 1174 fpregset = NULL; 1175 psinfo = NULL; 1176 } 1177 1178 if (dst != NULL) { 1179 psinfo->pr_version = PRPSINFO_VERSION; 1180 psinfo->pr_psinfosz = sizeof(prpsinfo_t); 1181 strlcpy(psinfo->pr_fname, p->p_comm, sizeof(psinfo->pr_fname)); 1182 /* 1183 * XXX - We don't fill in the command line arguments properly 1184 * yet. 1185 */ 1186 strlcpy(psinfo->pr_psargs, p->p_comm, 1187 sizeof(psinfo->pr_psargs)); 1188 } 1189 __elfN(putnote)(dst, off, "FreeBSD", NT_PRPSINFO, psinfo, 1190 sizeof *psinfo); 1191 1192 /* 1193 * To have the debugger select the right thread (LWP) as the initial 1194 * thread, we dump the state of the thread passed to us in td first. 1195 * This is the thread that causes the core dump and thus likely to 1196 * be the right thread one wants to have selected in the debugger. 1197 */ 1198 thr = td; 1199 while (thr != NULL) { 1200 if (dst != NULL) { 1201 status->pr_version = PRSTATUS_VERSION; 1202 status->pr_statussz = sizeof(prstatus_t); 1203 status->pr_gregsetsz = sizeof(gregset_t); 1204 status->pr_fpregsetsz = sizeof(fpregset_t); 1205 status->pr_osreldate = osreldate; 1206 status->pr_cursig = p->p_sig; 1207 status->pr_pid = thr->td_tid; 1208 fill_regs(thr, &status->pr_reg); 1209 fill_fpregs(thr, fpregset); 1210 } 1211 __elfN(putnote)(dst, off, "FreeBSD", NT_PRSTATUS, status, 1212 sizeof *status); 1213 __elfN(putnote)(dst, off, "FreeBSD", NT_FPREGSET, fpregset, 1214 sizeof *fpregset); 1215 /* 1216 * Allow for MD specific notes, as well as any MD 1217 * specific preparations for writing MI notes. 1218 */ 1219 __elfN(dump_thread)(thr, dst, off); 1220 1221 thr = (thr == td) ? TAILQ_FIRST(&p->p_threads) : 1222 TAILQ_NEXT(thr, td_plist); 1223 if (thr == td) 1224 thr = TAILQ_NEXT(thr, td_plist); 1225 } 1226 1227 notesz = *off - noteoff; 1228 1229 if (dst != NULL) 1230 free(tempdata, M_TEMP); 1231 1232 /* Align up to a page boundary for the program segments. */ 1233 *off = round_page(*off); 1234 1235 if (dst != NULL) { 1236 Elf_Ehdr *ehdr; 1237 Elf_Phdr *phdr; 1238 struct phdr_closure phc; 1239 1240 /* 1241 * Fill in the ELF header. 1242 */ 1243 ehdr = (Elf_Ehdr *)((char *)dst + ehoff); 1244 ehdr->e_ident[EI_MAG0] = ELFMAG0; 1245 ehdr->e_ident[EI_MAG1] = ELFMAG1; 1246 ehdr->e_ident[EI_MAG2] = ELFMAG2; 1247 ehdr->e_ident[EI_MAG3] = ELFMAG3; 1248 ehdr->e_ident[EI_CLASS] = ELF_CLASS; 1249 ehdr->e_ident[EI_DATA] = ELF_DATA; 1250 ehdr->e_ident[EI_VERSION] = EV_CURRENT; 1251 ehdr->e_ident[EI_OSABI] = ELFOSABI_FREEBSD; 1252 ehdr->e_ident[EI_ABIVERSION] = 0; 1253 ehdr->e_ident[EI_PAD] = 0; 1254 ehdr->e_type = ET_CORE; 1255 ehdr->e_machine = ELF_ARCH; 1256 ehdr->e_version = EV_CURRENT; 1257 ehdr->e_entry = 0; 1258 ehdr->e_phoff = phoff; 1259 ehdr->e_flags = 0; 1260 ehdr->e_ehsize = sizeof(Elf_Ehdr); 1261 ehdr->e_phentsize = sizeof(Elf_Phdr); 1262 ehdr->e_phnum = numsegs + 1; 1263 ehdr->e_shentsize = sizeof(Elf_Shdr); 1264 ehdr->e_shnum = 0; 1265 ehdr->e_shstrndx = SHN_UNDEF; 1266 1267 /* 1268 * Fill in the program header entries. 1269 */ 1270 phdr = (Elf_Phdr *)((char *)dst + phoff); 1271 1272 /* The note segement. */ 1273 phdr->p_type = PT_NOTE; 1274 phdr->p_offset = noteoff; 1275 phdr->p_vaddr = 0; 1276 phdr->p_paddr = 0; 1277 phdr->p_filesz = notesz; 1278 phdr->p_memsz = 0; 1279 phdr->p_flags = 0; 1280 phdr->p_align = 0; 1281 phdr++; 1282 1283 /* All the writable segments from the program. */ 1284 phc.phdr = phdr; 1285 phc.offset = *off; 1286 each_writable_segment(td, cb_put_phdr, &phc); 1287 } 1288 } 1289 1290 static void 1291 __elfN(putnote)(void *dst, size_t *off, const char *name, int type, 1292 const void *desc, size_t descsz) 1293 { 1294 Elf_Note note; 1295 1296 note.n_namesz = strlen(name) + 1; 1297 note.n_descsz = descsz; 1298 note.n_type = type; 1299 if (dst != NULL) 1300 bcopy(¬e, (char *)dst + *off, sizeof note); 1301 *off += sizeof note; 1302 if (dst != NULL) 1303 bcopy(name, (char *)dst + *off, note.n_namesz); 1304 *off += roundup2(note.n_namesz, sizeof(Elf_Size)); 1305 if (dst != NULL) 1306 bcopy(desc, (char *)dst + *off, note.n_descsz); 1307 *off += roundup2(note.n_descsz, sizeof(Elf_Size)); 1308 } 1309 1310 /* 1311 * Tell kern_execve.c about it, with a little help from the linker. 1312 */ 1313 static struct execsw __elfN(execsw) = { 1314 __CONCAT(exec_, __elfN(imgact)), 1315 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) 1316 }; 1317 EXEC_SET(__CONCAT(elf, __ELF_WORD_SIZE), __elfN(execsw));
Cache object: f560efb986fa2ea3749d3d60ba766c9d
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]