imgact_elf.c revision 153487
118390Speter/*- 249810Sobrien * Copyright (c) 2000 David O'Brien 318390Speter * Copyright (c) 1995-1996 S�ren Schmidt 418390Speter * Copyright (c) 1996 Peter Wemm 518390Speter * All rights reserved. 618390Speter * 734112Sbde * Redistribution and use in source and binary forms, with or without 818390Speter * modification, are permitted provided that the following conditions 918390Speter * are met: 1018390Speter * 1. Redistributions of source code must retain the above copyright 1118390Speter * notice, this list of conditions and the following disclaimer 1235402Sbde * in this position and unchanged. 1335402Sbde * 2. Redistributions in binary form must reproduce the above copyright 1435402Sbde * notice, this list of conditions and the following disclaimer in the 1535402Sbde * documentation and/or other materials provided with the distribution. 1645582Sbde * 3. The name of the author may not be used to endorse or promote products 1735402Sbde * derived from this software without specific prior written permission 1818390Speter * 1918390Speter * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 2045583Sbde * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 2145583Sbde * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 2245582Sbde * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 2345582Sbde * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 2418390Speter * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 2518390Speter * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 2618390Speter * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 2735402Sbde * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 2835402Sbde * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 2918390Speter */ 3035402Sbde 3118390Speter#include <sys/cdefs.h> 3218390Speter__FBSDID("$FreeBSD: head/sys/kern/imgact_elf.c 153487 2005-12-16 19:14:25Z alc $"); 3335402Sbde 3435402Sbde#include "opt_compat.h" 3518390Speter 3635402Sbde#include <sys/param.h> 3718390Speter#include <sys/exec.h> 3818390Speter#include <sys/fcntl.h> 3935402Sbde#include <sys/imgact.h> 4037460Sbde#include <sys/imgact_elf.h> 4137460Sbde#include <sys/kernel.h> 4245299Sobrien#include <sys/lock.h> 4338462Sjb#include <sys/malloc.h> 4418390Speter#include <sys/mount.h> 4535402Sbde#include <sys/mutex.h> 4635402Sbde#include <sys/mman.h> 4718390Speter#include <sys/namei.h> 4818390Speter#include <sys/pioctl.h> 4945583Sbde#include <sys/proc.h> 5045299Sobrien#include <sys/procfs.h> 5145299Sobrien#include <sys/resourcevar.h> 5245583Sbde#include <sys/sf_buf.h> 5345299Sobrien#include <sys/systm.h> 5445299Sobrien#include <sys/signalvar.h> 5545299Sobrien#include <sys/stat.h> 5645299Sobrien#include <sys/sx.h> 5745299Sobrien#include <sys/syscall.h> 5845299Sobrien#include <sys/sysctl.h> 5945583Sbde#include <sys/sysent.h> 6045299Sobrien#include <sys/vnode.h> 6145583Sbde 6237460Sbde#include <vm/vm.h> 6337460Sbde#include <vm/vm_kern.h> 6445583Sbde#include <vm/vm_param.h> 6538462Sjb#include <vm/pmap.h> 6618390Speter#include <vm/vm_map.h> 6735402Sbde#include <vm/vm_object.h> 6835402Sbde#include <vm/vm_extern.h> 6918390Speter 7018390Speter#include <machine/elf.h> 7145583Sbde#include <machine/md_var.h> 7245583Sbde 7345583Sbde#if defined(COMPAT_IA32) && __ELF_WORD_SIZE == 32 7445583Sbde#include <machine/fpu.h> 7545583Sbde#include <compat/ia32/ia32_reg.h> 7645583Sbde#endif 7718390Speter 7818390Speter#define OLD_EI_BRAND 8 7918390Speter 8018390Speterstatic int __elfN(check_header)(const Elf_Ehdr *hdr); 8118390Speterstatic Elf_Brandinfo *__elfN(get_brandinfo)(const Elf_Ehdr *hdr, 8235402Sbde const char *interp); 8318390Speterstatic int __elfN(load_file)(struct proc *p, const char *file, u_long *addr, 8418390Speter u_long *entry, size_t pagesize); 8518390Speterstatic int __elfN(load_section)(struct proc *p, 8618390Speter struct vmspace *vmspace, struct vnode *vp, vm_object_t object, 8718390Speter vm_offset_t offset, caddr_t vmaddr, size_t memsz, size_t filsz, 8818390Speter vm_prot_t prot, size_t pagesize); 8935402Sbdestatic int __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp); 9018390Speter 9118390SpeterSYSCTL_NODE(_kern, OID_AUTO, __CONCAT(elf, __ELF_WORD_SIZE), CTLFLAG_RW, 0, 9245583Sbde ""); 9345299Sobrien 9445299Sobrienint __elfN(fallback_brand) = -1; 9545299SobrienSYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO, 9645519Sbde fallback_brand, CTLFLAG_RW, &__elfN(fallback_brand), 0, 9745299Sobrien __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) " brand of last resort"); 9845299SobrienTUNABLE_INT("kern.elf" __XSTRING(__ELF_WORD_SIZE) ".fallback_brand", 9918390Speter &__elfN(fallback_brand)); 10045519Sbde 10118390Speterint __elfN(can_exec_dyn) = 0; 10218390SpeterSYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO, 10318390Speter can_exec_dyn, CTLFLAG_RW, &__elfN(can_exec_dyn), 0, 10418390Speter __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) " can exec shared libraries"); 10549152Sobrien 10649810Sobrienstatic int elf_trace = 0; 10718390SpeterSYSCTL_INT(_debug, OID_AUTO, __elfN(trace), CTLFLAG_RW, &elf_trace, 0, ""); 10835402Sbde 10949810Sobrienstatic int elf_legacy_coredump = 0; 11018390SpeterSYSCTL_INT(_debug, OID_AUTO, __elfN(legacy_coredump), CTLFLAG_RW, 11118390Speter &elf_legacy_coredump, 0, ""); 11218390Speter 11345519Sbdestatic Elf_Brandinfo *elf_brand_list[MAX_BRANDS]; 11418390Speter 11518390Speterint 11618390Speter__elfN(insert_brand_entry)(Elf_Brandinfo *entry) 11718390Speter{ 11849152Sobrien int i; 11949810Sobrien 12018390Speter for (i = 0; i < MAX_BRANDS; i++) { 12135402Sbde if (elf_brand_list[i] == NULL) { 12249810Sobrien elf_brand_list[i] = entry; 12318390Speter break; 12418390Speter } 12534112Sbde } 12618390Speter if (i == MAX_BRANDS) 12734112Sbde return (-1); 12818390Speter return (0); 12918390Speter} 13018390Speter 13145583Sbdeint 13240457Sbde__elfN(remove_brand_entry)(Elf_Brandinfo *entry) 13334112Sbde{ 13445299Sobrien int i; 13545299Sobrien 13645943Sobrien for (i = 0; i < MAX_BRANDS; i++) { 13745299Sobrien if (elf_brand_list[i] == entry) { 13845583Sbde elf_brand_list[i] = NULL; 13945583Sbde break; 14045583Sbde } 14145583Sbde } 14245583Sbde if (i == MAX_BRANDS) 14345583Sbde return (-1); 14445299Sobrien return (0); 14540457Sbde} 14640457Sbde 14745767Sobrienint 14845299Sobrien__elfN(brand_inuse)(Elf_Brandinfo *entry) 14940457Sbde{ 15045299Sobrien struct proc *p; 15145767Sobrien int rval = FALSE; 15245299Sobrien 15345583Sbde sx_slock(&allproc_lock); 15445943Sobrien LIST_FOREACH(p, &allproc, p_list) { 15545583Sbde if (p->p_sysent == entry->sysvec) { 15640457Sbde rval = TRUE; 15745943Sobrien break; 15845943Sobrien } 15945943Sobrien } 16045943Sobrien sx_sunlock(&allproc_lock); 16145305Sobrien 16246157Sobrien return (rval); 16318390Speter} 16434229Speter 16535402Sbdestatic Elf_Brandinfo * 16634229Speter__elfN(get_brandinfo)(const Elf_Ehdr *hdr, const char *interp) 16735402Sbde{ 16835402Sbde Elf_Brandinfo *bi; 16934229Speter int i; 17035402Sbde 17135402Sbde /* 17235402Sbde * We support three types of branding -- (1) the ELF EI_OSABI field 17335402Sbde * that SCO added to the ELF spec, (2) FreeBSD 3.x's traditional string 17434229Speter * branding w/in the ELF header, and (3) path of the `interp_path' 17535402Sbde * field. We should also look for an ".note.ABI-tag" ELF section now 17634112Sbde * in all Linux ELF binaries, FreeBSD 4.1+, and some NetBSD ones. 17735402Sbde */ 17835402Sbde 17935402Sbde /* If the executable has a brand, search for it in the brand list. */ 18035402Sbde for (i = 0; i < MAX_BRANDS; i++) { 18135402Sbde bi = elf_brand_list[i]; 18235402Sbde if (bi != NULL && hdr->e_machine == bi->machine && 18345519Sbde (hdr->e_ident[EI_OSABI] == bi->brand || 18445519Sbde strncmp((const char *)&hdr->e_ident[OLD_EI_BRAND], 18545519Sbde bi->compat_3_brand, strlen(bi->compat_3_brand)) == 0)) 18645519Sbde return (bi); 18745519Sbde } 18835402Sbde 18945519Sbde /* Lacking a known brand, search for a recognized interpreter. */ 19035402Sbde if (interp != NULL) { 19145519Sbde for (i = 0; i < MAX_BRANDS; i++) { 19245519Sbde bi = elf_brand_list[i]; 19345519Sbde if (bi != NULL && hdr->e_machine == bi->machine && 19435402Sbde strcmp(interp, bi->interp_path) == 0) 19545519Sbde return (bi); 19645519Sbde } 19745519Sbde } 19845519Sbde 19935402Sbde /* Lacking a recognized interpreter, try the default brand */ 200 for (i = 0; i < MAX_BRANDS; i++) { 201 bi = elf_brand_list[i]; 202 if (bi != NULL && hdr->e_machine == bi->machine && 203 __elfN(fallback_brand) == bi->brand) 204 return (bi); 205 } 206 return (NULL); 207} 208 209static int 210__elfN(check_header)(const Elf_Ehdr *hdr) 211{ 212 Elf_Brandinfo *bi; 213 int i; 214 215 if (!IS_ELF(*hdr) || 216 hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS || 217 hdr->e_ident[EI_DATA] != ELF_TARG_DATA || 218 hdr->e_ident[EI_VERSION] != EV_CURRENT || 219 hdr->e_phentsize != sizeof(Elf_Phdr) || 220 hdr->e_version != ELF_TARG_VER) 221 return (ENOEXEC); 222 223 /* 224 * Make sure we have at least one brand for this machine. 225 */ 226 227 for (i = 0; i < MAX_BRANDS; i++) { 228 bi = elf_brand_list[i]; 229 if (bi != NULL && bi->machine == hdr->e_machine) 230 break; 231 } 232 if (i == MAX_BRANDS) 233 return (ENOEXEC); 234 235 return (0); 236} 237 238static int 239__elfN(map_partial)(vm_map_t map, vm_object_t object, vm_ooffset_t offset, 240 vm_offset_t start, vm_offset_t end, vm_prot_t prot, 241 vm_prot_t max) 242{ 243 struct sf_buf *sf; 244 int error; 245 vm_offset_t off; 246 247 /* 248 * Create the page if it doesn't exist yet. Ignore errors. 249 */ 250 vm_map_lock(map); 251 vm_map_insert(map, NULL, 0, trunc_page(start), round_page(end), max, 252 max, 0); 253 vm_map_unlock(map); 254 255 /* 256 * Find the page from the underlying object. 257 */ 258 if (object) { 259 sf = vm_imgact_map_page(object, offset); 260 if (sf == NULL) 261 return (KERN_FAILURE); 262 off = offset - trunc_page(offset); 263 error = copyout((caddr_t)sf_buf_kva(sf) + off, (caddr_t)start, 264 end - start); 265 vm_imgact_unmap_page(sf); 266 if (error) { 267 return (KERN_FAILURE); 268 } 269 } 270 271 return (KERN_SUCCESS); 272} 273 274static int 275__elfN(map_insert)(vm_map_t map, vm_object_t object, vm_ooffset_t offset, 276 vm_offset_t start, vm_offset_t end, vm_prot_t prot, 277 vm_prot_t max, int cow) 278{ 279 struct sf_buf *sf; 280 vm_offset_t off; 281 vm_size_t sz; 282 int error, rv; 283 284 if (start != trunc_page(start)) { 285 rv = __elfN(map_partial)(map, object, offset, start, 286 round_page(start), prot, max); 287 if (rv) 288 return (rv); 289 offset += round_page(start) - start; 290 start = round_page(start); 291 } 292 if (end != round_page(end)) { 293 rv = __elfN(map_partial)(map, object, offset + 294 trunc_page(end) - start, trunc_page(end), end, prot, max); 295 if (rv) 296 return (rv); 297 end = trunc_page(end); 298 } 299 if (end > start) { 300 if (offset & PAGE_MASK) { 301 /* 302 * The mapping is not page aligned. This means we have 303 * to copy the data. Sigh. 304 */ 305 rv = vm_map_find(map, NULL, 0, &start, end - start, 306 FALSE, prot, max, 0); 307 if (rv) 308 return (rv); 309 if (object == NULL) 310 return (KERN_SUCCESS); 311 for (; start < end; start += sz) { 312 sf = vm_imgact_map_page(object, offset); 313 if (sf == NULL) 314 return (KERN_FAILURE); 315 off = offset - trunc_page(offset); 316 sz = end - start; 317 if (sz > PAGE_SIZE - off) 318 sz = PAGE_SIZE - off; 319 error = copyout((caddr_t)sf_buf_kva(sf) + off, 320 (caddr_t)start, sz); 321 vm_imgact_unmap_page(sf); 322 if (error) { 323 return (KERN_FAILURE); 324 } 325 offset += sz; 326 } 327 rv = KERN_SUCCESS; 328 } else { 329 vm_map_lock(map); 330 rv = vm_map_insert(map, object, offset, start, end, 331 prot, max, cow); 332 vm_map_unlock(map); 333 } 334 return (rv); 335 } else { 336 return (KERN_SUCCESS); 337 } 338} 339 340static int 341__elfN(load_section)(struct proc *p, struct vmspace *vmspace, 342 struct vnode *vp, vm_object_t object, vm_offset_t offset, 343 caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot, 344 size_t pagesize) 345{ 346 struct sf_buf *sf; 347 size_t map_len; 348 vm_offset_t map_addr; 349 int error, rv, cow; 350 size_t copy_len; 351 vm_offset_t file_addr; 352 353 error = 0; 354 355 /* 356 * It's necessary to fail if the filsz + offset taken from the 357 * header is greater than the actual file pager object's size. 358 * If we were to allow this, then the vm_map_find() below would 359 * walk right off the end of the file object and into the ether. 360 * 361 * While I'm here, might as well check for something else that 362 * is invalid: filsz cannot be greater than memsz. 363 */ 364 if ((off_t)filsz + offset > object->un_pager.vnp.vnp_size || 365 filsz > memsz) { 366 uprintf("elf_load_section: truncated ELF file\n"); 367 return (ENOEXEC); 368 } 369 370#define trunc_page_ps(va, ps) ((va) & ~(ps - 1)) 371#define round_page_ps(va, ps) (((va) + (ps - 1)) & ~(ps - 1)) 372 373 map_addr = trunc_page_ps((vm_offset_t)vmaddr, pagesize); 374 file_addr = trunc_page_ps(offset, pagesize); 375 376 /* 377 * We have two choices. We can either clear the data in the last page 378 * of an oversized mapping, or we can start the anon mapping a page 379 * early and copy the initialized data into that first page. We 380 * choose the second.. 381 */ 382 if (memsz > filsz) 383 map_len = trunc_page_ps(offset + filsz, pagesize) - file_addr; 384 else 385 map_len = round_page_ps(offset + filsz, pagesize) - file_addr; 386 387 if (map_len != 0) { 388 vm_object_reference(object); 389 390 /* cow flags: don't dump readonly sections in core */ 391 cow = MAP_COPY_ON_WRITE | MAP_PREFAULT | 392 (prot & VM_PROT_WRITE ? 0 : MAP_DISABLE_COREDUMP); 393 394 rv = __elfN(map_insert)(&vmspace->vm_map, 395 object, 396 file_addr, /* file offset */ 397 map_addr, /* virtual start */ 398 map_addr + map_len,/* virtual end */ 399 prot, 400 VM_PROT_ALL, 401 cow); 402 if (rv != KERN_SUCCESS) { 403 vm_object_deallocate(object); 404 return (EINVAL); 405 } 406 407 /* we can stop now if we've covered it all */ 408 if (memsz == filsz) { 409 return (0); 410 } 411 } 412 413 414 /* 415 * We have to get the remaining bit of the file into the first part 416 * of the oversized map segment. This is normally because the .data 417 * segment in the file is extended to provide bss. It's a neat idea 418 * to try and save a page, but it's a pain in the behind to implement. 419 */ 420 copy_len = (offset + filsz) - trunc_page_ps(offset + filsz, pagesize); 421 map_addr = trunc_page_ps((vm_offset_t)vmaddr + filsz, pagesize); 422 map_len = round_page_ps((vm_offset_t)vmaddr + memsz, pagesize) - 423 map_addr; 424 425 /* This had damn well better be true! */ 426 if (map_len != 0) { 427 rv = __elfN(map_insert)(&vmspace->vm_map, NULL, 0, map_addr, 428 map_addr + map_len, VM_PROT_ALL, VM_PROT_ALL, 0); 429 if (rv != KERN_SUCCESS) { 430 return (EINVAL); 431 } 432 } 433 434 if (copy_len != 0) { 435 vm_offset_t off; 436 437 sf = vm_imgact_map_page(object, offset + filsz); 438 if (sf == NULL) 439 return (EIO); 440 441 /* send the page fragment to user space */ 442 off = trunc_page_ps(offset + filsz, pagesize) - 443 trunc_page(offset + filsz); 444 error = copyout((caddr_t)sf_buf_kva(sf) + off, 445 (caddr_t)map_addr, copy_len); 446 vm_imgact_unmap_page(sf); 447 if (error) { 448 return (error); 449 } 450 } 451 452 /* 453 * set it to the specified protection. 454 * XXX had better undo the damage from pasting over the cracks here! 455 */ 456 vm_map_protect(&vmspace->vm_map, trunc_page(map_addr), 457 round_page(map_addr + map_len), prot, FALSE); 458 459 return (error); 460} 461 462/* 463 * Load the file "file" into memory. It may be either a shared object 464 * or an executable. 465 * 466 * The "addr" reference parameter is in/out. On entry, it specifies 467 * the address where a shared object should be loaded. If the file is 468 * an executable, this value is ignored. On exit, "addr" specifies 469 * where the file was actually loaded. 470 * 471 * The "entry" reference parameter is out only. On exit, it specifies 472 * the entry point for the loaded file. 473 */ 474static int 475__elfN(load_file)(struct proc *p, const char *file, u_long *addr, 476 u_long *entry, size_t pagesize) 477{ 478 struct { 479 struct nameidata nd; 480 struct vattr attr; 481 struct image_params image_params; 482 } *tempdata; 483 const Elf_Ehdr *hdr = NULL; 484 const Elf_Phdr *phdr = NULL; 485 struct nameidata *nd; 486 struct vmspace *vmspace = p->p_vmspace; 487 struct vattr *attr; 488 struct image_params *imgp; 489 vm_prot_t prot; 490 u_long rbase; 491 u_long base_addr = 0; 492 int vfslocked, error, i, numsegs; 493 494 if (curthread->td_proc != p) 495 panic("elf_load_file - thread"); /* XXXKSE DIAGNOSTIC */ 496 497 tempdata = malloc(sizeof(*tempdata), M_TEMP, M_WAITOK); 498 nd = &tempdata->nd; 499 attr = &tempdata->attr; 500 imgp = &tempdata->image_params; 501 502 /* 503 * Initialize part of the common data 504 */ 505 imgp->proc = p; 506 imgp->attr = attr; 507 imgp->firstpage = NULL; 508 imgp->image_header = NULL; 509 imgp->object = NULL; 510 imgp->execlabel = NULL; 511 512 /* XXXKSE */ 513 NDINIT(nd, LOOKUP, MPSAFE|LOCKLEAF|FOLLOW, UIO_SYSSPACE, file, 514 curthread); 515 vfslocked = 0; 516 if ((error = namei(nd)) != 0) { 517 nd->ni_vp = NULL; 518 goto fail; 519 } 520 vfslocked = NDHASGIANT(nd); 521 NDFREE(nd, NDF_ONLY_PNBUF); 522 imgp->vp = nd->ni_vp; 523 524 /* 525 * Check permissions, modes, uid, etc on the file, and "open" it. 526 */ 527 error = exec_check_permissions(imgp); 528 if (error) { 529 VOP_UNLOCK(nd->ni_vp, 0, curthread); /* XXXKSE */ 530 goto fail; 531 } 532 533 error = exec_map_first_page(imgp); 534 /* 535 * Also make certain that the interpreter stays the same, so set 536 * its VV_TEXT flag, too. 537 */ 538 if (error == 0) 539 nd->ni_vp->v_vflag |= VV_TEXT; 540 541 imgp->object = nd->ni_vp->v_object; 542 vm_object_reference(imgp->object); 543 544 VOP_UNLOCK(nd->ni_vp, 0, curthread); /* XXXKSE */ 545 if (error) 546 goto fail; 547 548 hdr = (const Elf_Ehdr *)imgp->image_header; 549 if ((error = __elfN(check_header)(hdr)) != 0) 550 goto fail; 551 if (hdr->e_type == ET_DYN) 552 rbase = *addr; 553 else if (hdr->e_type == ET_EXEC) 554 rbase = 0; 555 else { 556 error = ENOEXEC; 557 goto fail; 558 } 559 560 /* Only support headers that fit within first page for now */ 561 /* (multiplication of two Elf_Half fields will not overflow) */ 562 if ((hdr->e_phoff > PAGE_SIZE) || 563 (hdr->e_phentsize * hdr->e_phnum) > PAGE_SIZE - hdr->e_phoff) { 564 error = ENOEXEC; 565 goto fail; 566 } 567 568 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 569 570 for (i = 0, numsegs = 0; i < hdr->e_phnum; i++) { 571 if (phdr[i].p_type == PT_LOAD) { /* Loadable segment */ 572 prot = 0; 573 if (phdr[i].p_flags & PF_X) 574 prot |= VM_PROT_EXECUTE; 575 if (phdr[i].p_flags & PF_W) 576 prot |= VM_PROT_WRITE; 577 if (phdr[i].p_flags & PF_R) 578 prot |= VM_PROT_READ; 579 580 if ((error = __elfN(load_section)(p, vmspace, 581 nd->ni_vp, imgp->object, phdr[i].p_offset, 582 (caddr_t)(uintptr_t)phdr[i].p_vaddr + rbase, 583 phdr[i].p_memsz, phdr[i].p_filesz, prot, 584 pagesize)) != 0) 585 goto fail; 586 /* 587 * Establish the base address if this is the 588 * first segment. 589 */ 590 if (numsegs == 0) 591 base_addr = trunc_page(phdr[i].p_vaddr + 592 rbase); 593 numsegs++; 594 } 595 } 596 *addr = base_addr; 597 *entry = (unsigned long)hdr->e_entry + rbase; 598 599fail: 600 if (imgp->firstpage) 601 exec_unmap_first_page(imgp); 602 if (imgp->object) 603 vm_object_deallocate(imgp->object); 604 605 if (nd->ni_vp) 606 vrele(nd->ni_vp); 607 608 VFS_UNLOCK_GIANT(vfslocked); 609 free(tempdata, M_TEMP); 610 611 return (error); 612} 613 614static int 615__CONCAT(exec_, __elfN(imgact))(struct image_params *imgp) 616{ 617 const Elf_Ehdr *hdr = (const Elf_Ehdr *)imgp->image_header; 618 const Elf_Phdr *phdr; 619 Elf_Auxargs *elf_auxargs = NULL; 620 struct vmspace *vmspace; 621 vm_prot_t prot; 622 u_long text_size = 0, data_size = 0, total_size = 0; 623 u_long text_addr = 0, data_addr = 0; 624 u_long seg_size, seg_addr; 625 u_long addr, entry = 0, proghdr = 0; 626 int error = 0, i; 627 const char *interp = NULL; 628 Elf_Brandinfo *brand_info; 629 char *path; 630 struct thread *td = curthread; 631 struct sysentvec *sv; 632 633 /* 634 * Do we have a valid ELF header ? 635 */ 636 if (__elfN(check_header)(hdr) != 0 || (hdr->e_type != ET_EXEC 637 && (!__elfN(can_exec_dyn) || hdr->e_type != ET_DYN))) 638 return (-1); 639 640 /* 641 * From here on down, we return an errno, not -1, as we've 642 * detected an ELF file. 643 */ 644 645 if ((hdr->e_phoff > PAGE_SIZE) || 646 (hdr->e_phoff + hdr->e_phentsize * hdr->e_phnum) > PAGE_SIZE) { 647 /* Only support headers in first page for now */ 648 return (ENOEXEC); 649 } 650 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 651 652 /* 653 * From this point on, we may have resources that need to be freed. 654 */ 655 656 VOP_UNLOCK(imgp->vp, 0, td); 657 658 for (i = 0; i < hdr->e_phnum; i++) { 659 switch (phdr[i].p_type) { 660 case PT_INTERP: /* Path to interpreter */ 661 if (phdr[i].p_filesz > MAXPATHLEN || 662 phdr[i].p_offset + phdr[i].p_filesz > PAGE_SIZE) { 663 error = ENOEXEC; 664 goto fail; 665 } 666 interp = imgp->image_header + phdr[i].p_offset; 667 break; 668 default: 669 break; 670 } 671 } 672 673 brand_info = __elfN(get_brandinfo)(hdr, interp); 674 if (brand_info == NULL) { 675 uprintf("ELF binary type \"%u\" not known.\n", 676 hdr->e_ident[EI_OSABI]); 677 error = ENOEXEC; 678 goto fail; 679 } 680 sv = brand_info->sysvec; 681 if (interp != NULL && brand_info->interp_newpath != NULL) 682 interp = brand_info->interp_newpath; 683 684 exec_new_vmspace(imgp, sv); 685 686 vmspace = imgp->proc->p_vmspace; 687 688 for (i = 0; i < hdr->e_phnum; i++) { 689 switch (phdr[i].p_type) { 690 case PT_LOAD: /* Loadable segment */ 691 prot = 0; 692 if (phdr[i].p_flags & PF_X) 693 prot |= VM_PROT_EXECUTE; 694 if (phdr[i].p_flags & PF_W) 695 prot |= VM_PROT_WRITE; 696 if (phdr[i].p_flags & PF_R) 697 prot |= VM_PROT_READ; 698 699#if defined(__ia64__) && __ELF_WORD_SIZE == 32 && defined(IA32_ME_HARDER) 700 /* 701 * Some x86 binaries assume read == executable, 702 * notably the M3 runtime and therefore cvsup 703 */ 704 if (prot & VM_PROT_READ) 705 prot |= VM_PROT_EXECUTE; 706#endif 707 708 if ((error = __elfN(load_section)(imgp->proc, vmspace, 709 imgp->vp, imgp->object, phdr[i].p_offset, 710 (caddr_t)(uintptr_t)phdr[i].p_vaddr, 711 phdr[i].p_memsz, phdr[i].p_filesz, prot, 712 sv->sv_pagesize)) != 0) 713 goto fail; 714 715 /* 716 * If this segment contains the program headers, 717 * remember their virtual address for the AT_PHDR 718 * aux entry. Static binaries don't usually include 719 * a PT_PHDR entry. 720 */ 721 if (phdr[i].p_offset == 0 && 722 hdr->e_phoff + hdr->e_phnum * hdr->e_phentsize 723 <= phdr[i].p_filesz) 724 proghdr = phdr[i].p_vaddr + hdr->e_phoff; 725 726 seg_addr = trunc_page(phdr[i].p_vaddr); 727 seg_size = round_page(phdr[i].p_memsz + 728 phdr[i].p_vaddr - seg_addr); 729 730 /* 731 * Is this .text or .data? We can't use 732 * VM_PROT_WRITE or VM_PROT_EXEC, it breaks the 733 * alpha terribly and possibly does other bad 734 * things so we stick to the old way of figuring 735 * it out: If the segment contains the program 736 * entry point, it's a text segment, otherwise it 737 * is a data segment. 738 * 739 * Note that obreak() assumes that data_addr + 740 * data_size == end of data load area, and the ELF 741 * file format expects segments to be sorted by 742 * address. If multiple data segments exist, the 743 * last one will be used. 744 */ 745 if (hdr->e_entry >= phdr[i].p_vaddr && 746 hdr->e_entry < (phdr[i].p_vaddr + 747 phdr[i].p_memsz)) { 748 text_size = seg_size; 749 text_addr = seg_addr; 750 entry = (u_long)hdr->e_entry; 751 } else { 752 data_size = seg_size; 753 data_addr = seg_addr; 754 } 755 total_size += seg_size; 756 break; 757 case PT_PHDR: /* Program header table info */ 758 proghdr = phdr[i].p_vaddr; 759 break; 760 default: 761 break; 762 } 763 } 764 765 if (data_addr == 0 && data_size == 0) { 766 data_addr = text_addr; 767 data_size = text_size; 768 } 769 770 /* 771 * Check limits. It should be safe to check the 772 * limits after loading the segments since we do 773 * not actually fault in all the segments pages. 774 */ 775 PROC_LOCK(imgp->proc); 776 if (data_size > lim_cur(imgp->proc, RLIMIT_DATA) || 777 text_size > maxtsiz || 778 total_size > lim_cur(imgp->proc, RLIMIT_VMEM)) { 779 PROC_UNLOCK(imgp->proc); 780 error = ENOMEM; 781 goto fail; 782 } 783 784 vmspace->vm_tsize = text_size >> PAGE_SHIFT; 785 vmspace->vm_taddr = (caddr_t)(uintptr_t)text_addr; 786 vmspace->vm_dsize = data_size >> PAGE_SHIFT; 787 vmspace->vm_daddr = (caddr_t)(uintptr_t)data_addr; 788 789 /* 790 * We load the dynamic linker where a userland call 791 * to mmap(0, ...) would put it. The rationale behind this 792 * calculation is that it leaves room for the heap to grow to 793 * its maximum allowed size. 794 */ 795 addr = round_page((vm_offset_t)imgp->proc->p_vmspace->vm_daddr + 796 lim_max(imgp->proc, RLIMIT_DATA)); 797 PROC_UNLOCK(imgp->proc); 798 799 imgp->entry_addr = entry; 800 801 imgp->proc->p_sysent = sv; 802 if (interp != NULL && 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", brand_info->emul_path, 806 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 interp = NULL; 812 } 813 if (interp != NULL) { 814 error = __elfN(load_file)(imgp->proc, interp, &addr, 815 &imgp->entry_addr, sv->sv_pagesize); 816 if (error != 0) { 817 uprintf("ELF interpreter %s not found\n", interp); 818 goto fail; 819 } 820 } 821 822 /* 823 * Construct auxargs table (used by the fixup routine) 824 */ 825 elf_auxargs = malloc(sizeof(Elf_Auxargs), M_TEMP, M_WAITOK); 826 elf_auxargs->execfd = -1; 827 elf_auxargs->phdr = proghdr; 828 elf_auxargs->phent = hdr->e_phentsize; 829 elf_auxargs->phnum = hdr->e_phnum; 830 elf_auxargs->pagesz = PAGE_SIZE; 831 elf_auxargs->base = addr; 832 elf_auxargs->flags = 0; 833 elf_auxargs->entry = entry; 834 elf_auxargs->trace = elf_trace; 835 836 imgp->auxargs = elf_auxargs; 837 imgp->interpreted = 0; 838 839fail: 840 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY, td); 841 return (error); 842} 843 844#define suword __CONCAT(suword, __ELF_WORD_SIZE) 845 846int 847__elfN(freebsd_fixup)(register_t **stack_base, struct image_params *imgp) 848{ 849 Elf_Auxargs *args = (Elf_Auxargs *)imgp->auxargs; 850 Elf_Addr *base; 851 Elf_Addr *pos; 852 853 base = (Elf_Addr *)*stack_base; 854 pos = base + (imgp->args->argc + imgp->args->envc + 2); 855 856 if (args->trace) { 857 AUXARGS_ENTRY(pos, AT_DEBUG, 1); 858 } 859 if (args->execfd != -1) { 860 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd); 861 } 862 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr); 863 AUXARGS_ENTRY(pos, AT_PHENT, args->phent); 864 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum); 865 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz); 866 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags); 867 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry); 868 AUXARGS_ENTRY(pos, AT_BASE, args->base); 869 AUXARGS_ENTRY(pos, AT_NULL, 0); 870 871 free(imgp->auxargs, M_TEMP); 872 imgp->auxargs = NULL; 873 874 base--; 875 suword(base, (long)imgp->args->argc); 876 *stack_base = (register_t *)base; 877 return (0); 878} 879 880/* 881 * Code for generating ELF core dumps. 882 */ 883 884typedef void (*segment_callback)(vm_map_entry_t, void *); 885 886/* Closure for cb_put_phdr(). */ 887struct phdr_closure { 888 Elf_Phdr *phdr; /* Program header to fill in */ 889 Elf_Off offset; /* Offset of segment in core file */ 890}; 891 892/* Closure for cb_size_segment(). */ 893struct sseg_closure { 894 int count; /* Count of writable segments. */ 895 size_t size; /* Total size of all writable segments. */ 896}; 897 898static void cb_put_phdr(vm_map_entry_t, void *); 899static void cb_size_segment(vm_map_entry_t, void *); 900static void each_writable_segment(struct thread *, segment_callback, void *); 901static int __elfN(corehdr)(struct thread *, struct vnode *, struct ucred *, 902 int, void *, size_t); 903static void __elfN(puthdr)(struct thread *, void *, size_t *, int); 904static void __elfN(putnote)(void *, size_t *, const char *, int, 905 const void *, size_t); 906 907extern int osreldate; 908 909int 910__elfN(coredump)(td, vp, limit) 911 struct thread *td; 912 struct vnode *vp; 913 off_t limit; 914{ 915 struct ucred *cred = td->td_ucred; 916 int error = 0; 917 struct sseg_closure seginfo; 918 void *hdr; 919 size_t hdrsize; 920 921 /* Size the program segments. */ 922 seginfo.count = 0; 923 seginfo.size = 0; 924 each_writable_segment(td, cb_size_segment, &seginfo); 925 926 /* 927 * Calculate the size of the core file header area by making 928 * a dry run of generating it. Nothing is written, but the 929 * size is calculated. 930 */ 931 hdrsize = 0; 932 __elfN(puthdr)(td, (void *)NULL, &hdrsize, seginfo.count); 933 934 if (hdrsize + seginfo.size >= limit) 935 return (EFAULT); 936 937 /* 938 * Allocate memory for building the header, fill it up, 939 * and write it out. 940 */ 941 hdr = malloc(hdrsize, M_TEMP, M_WAITOK); 942 if (hdr == NULL) { 943 return (EINVAL); 944 } 945 error = __elfN(corehdr)(td, vp, cred, seginfo.count, hdr, hdrsize); 946 947 /* Write the contents of all of the writable segments. */ 948 if (error == 0) { 949 Elf_Phdr *php; 950 off_t offset; 951 int i; 952 953 php = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr)) + 1; 954 offset = hdrsize; 955 for (i = 0; i < seginfo.count; i++) { 956 error = vn_rdwr_inchunks(UIO_WRITE, vp, 957 (caddr_t)(uintptr_t)php->p_vaddr, 958 php->p_filesz, offset, UIO_USERSPACE, 959 IO_UNIT | IO_DIRECT, cred, NOCRED, NULL, 960 curthread); /* XXXKSE */ 961 if (error != 0) 962 break; 963 offset += php->p_filesz; 964 php++; 965 } 966 } 967 free(hdr, M_TEMP); 968 969 return (error); 970} 971 972/* 973 * A callback for each_writable_segment() to write out the segment's 974 * program header entry. 975 */ 976static void 977cb_put_phdr(entry, closure) 978 vm_map_entry_t entry; 979 void *closure; 980{ 981 struct phdr_closure *phc = (struct phdr_closure *)closure; 982 Elf_Phdr *phdr = phc->phdr; 983 984 phc->offset = round_page(phc->offset); 985 986 phdr->p_type = PT_LOAD; 987 phdr->p_offset = phc->offset; 988 phdr->p_vaddr = entry->start; 989 phdr->p_paddr = 0; 990 phdr->p_filesz = phdr->p_memsz = entry->end - entry->start; 991 phdr->p_align = PAGE_SIZE; 992 phdr->p_flags = 0; 993 if (entry->protection & VM_PROT_READ) 994 phdr->p_flags |= PF_R; 995 if (entry->protection & VM_PROT_WRITE) 996 phdr->p_flags |= PF_W; 997 if (entry->protection & VM_PROT_EXECUTE) 998 phdr->p_flags |= PF_X; 999 1000 phc->offset += phdr->p_filesz; 1001 phc->phdr++; 1002} 1003 1004/* 1005 * A callback for each_writable_segment() to gather information about 1006 * the number of segments and their total size. 1007 */ 1008static void 1009cb_size_segment(entry, closure) 1010 vm_map_entry_t entry; 1011 void *closure; 1012{ 1013 struct sseg_closure *ssc = (struct sseg_closure *)closure; 1014 1015 ssc->count++; 1016 ssc->size += entry->end - entry->start; 1017} 1018 1019/* 1020 * For each writable segment in the process's memory map, call the given 1021 * function with a pointer to the map entry and some arbitrary 1022 * caller-supplied data. 1023 */ 1024static void 1025each_writable_segment(td, func, closure) 1026 struct thread *td; 1027 segment_callback func; 1028 void *closure; 1029{ 1030 struct proc *p = td->td_proc; 1031 vm_map_t map = &p->p_vmspace->vm_map; 1032 vm_map_entry_t entry; 1033 1034 for (entry = map->header.next; entry != &map->header; 1035 entry = entry->next) { 1036 vm_object_t obj; 1037 1038 /* 1039 * Don't dump inaccessible mappings, deal with legacy 1040 * coredump mode. 1041 * 1042 * Note that read-only segments related to the elf binary 1043 * are marked MAP_ENTRY_NOCOREDUMP now so we no longer 1044 * need to arbitrarily ignore such segments. 1045 */ 1046 if (elf_legacy_coredump) { 1047 if ((entry->protection & VM_PROT_RW) != VM_PROT_RW) 1048 continue; 1049 } else { 1050 if ((entry->protection & VM_PROT_ALL) == 0) 1051 continue; 1052 } 1053 1054 /* 1055 * Dont include memory segment in the coredump if 1056 * MAP_NOCORE is set in mmap(2) or MADV_NOCORE in 1057 * madvise(2). Do not dump submaps (i.e. parts of the 1058 * kernel map). 1059 */ 1060 if (entry->eflags & (MAP_ENTRY_NOCOREDUMP|MAP_ENTRY_IS_SUB_MAP)) 1061 continue; 1062 1063 if ((obj = entry->object.vm_object) == NULL) 1064 continue; 1065 1066 /* Find the deepest backing object. */ 1067 while (obj->backing_object != NULL) 1068 obj = obj->backing_object; 1069 1070 /* Ignore memory-mapped devices and such things. */ 1071 if (obj->type != OBJT_DEFAULT && 1072 obj->type != OBJT_SWAP && 1073 obj->type != OBJT_VNODE) 1074 continue; 1075 1076 (*func)(entry, closure); 1077 } 1078} 1079 1080/* 1081 * Write the core file header to the file, including padding up to 1082 * the page boundary. 1083 */ 1084static int 1085__elfN(corehdr)(td, vp, cred, numsegs, hdr, hdrsize) 1086 struct thread *td; 1087 struct vnode *vp; 1088 struct ucred *cred; 1089 int numsegs; 1090 size_t hdrsize; 1091 void *hdr; 1092{ 1093 size_t off; 1094 1095 /* Fill in the header. */ 1096 bzero(hdr, hdrsize); 1097 off = 0; 1098 __elfN(puthdr)(td, hdr, &off, numsegs); 1099 1100 /* Write it to the core file. */ 1101 return (vn_rdwr_inchunks(UIO_WRITE, vp, hdr, hdrsize, (off_t)0, 1102 UIO_SYSSPACE, IO_UNIT | IO_DIRECT, cred, NOCRED, NULL, 1103 td)); /* XXXKSE */ 1104} 1105 1106#if defined(COMPAT_IA32) && __ELF_WORD_SIZE == 32 1107typedef struct prstatus32 elf_prstatus_t; 1108typedef struct prpsinfo32 elf_prpsinfo_t; 1109typedef struct fpreg32 elf_prfpregset_t; 1110typedef struct fpreg32 elf_fpregset_t; 1111typedef struct reg32 elf_gregset_t; 1112#else 1113typedef prstatus_t elf_prstatus_t; 1114typedef prpsinfo_t elf_prpsinfo_t; 1115typedef prfpregset_t elf_prfpregset_t; 1116typedef prfpregset_t elf_fpregset_t; 1117typedef gregset_t elf_gregset_t; 1118#endif 1119 1120static void 1121__elfN(puthdr)(struct thread *td, void *dst, size_t *off, int numsegs) 1122{ 1123 struct { 1124 elf_prstatus_t status; 1125 elf_prfpregset_t fpregset; 1126 elf_prpsinfo_t psinfo; 1127 } *tempdata; 1128 elf_prstatus_t *status; 1129 elf_prfpregset_t *fpregset; 1130 elf_prpsinfo_t *psinfo; 1131 struct proc *p; 1132 struct thread *thr; 1133 size_t ehoff, noteoff, notesz, phoff; 1134 1135 p = td->td_proc; 1136 1137 ehoff = *off; 1138 *off += sizeof(Elf_Ehdr); 1139 1140 phoff = *off; 1141 *off += (numsegs + 1) * sizeof(Elf_Phdr); 1142 1143 noteoff = *off; 1144 /* 1145 * Don't allocate space for the notes if we're just calculating 1146 * the size of the header. We also don't collect the data. 1147 */ 1148 if (dst != NULL) { 1149 tempdata = malloc(sizeof(*tempdata), M_TEMP, M_ZERO|M_WAITOK); 1150 status = &tempdata->status; 1151 fpregset = &tempdata->fpregset; 1152 psinfo = &tempdata->psinfo; 1153 } else { 1154 tempdata = NULL; 1155 status = NULL; 1156 fpregset = NULL; 1157 psinfo = NULL; 1158 } 1159 1160 if (dst != NULL) { 1161 psinfo->pr_version = PRPSINFO_VERSION; 1162 psinfo->pr_psinfosz = sizeof(elf_prpsinfo_t); 1163 strlcpy(psinfo->pr_fname, p->p_comm, sizeof(psinfo->pr_fname)); 1164 /* 1165 * XXX - We don't fill in the command line arguments properly 1166 * yet. 1167 */ 1168 strlcpy(psinfo->pr_psargs, p->p_comm, 1169 sizeof(psinfo->pr_psargs)); 1170 } 1171 __elfN(putnote)(dst, off, "FreeBSD", NT_PRPSINFO, psinfo, 1172 sizeof *psinfo); 1173 1174 /* 1175 * To have the debugger select the right thread (LWP) as the initial 1176 * thread, we dump the state of the thread passed to us in td first. 1177 * This is the thread that causes the core dump and thus likely to 1178 * be the right thread one wants to have selected in the debugger. 1179 */ 1180 thr = td; 1181 while (thr != NULL) { 1182 if (dst != NULL) { 1183 status->pr_version = PRSTATUS_VERSION; 1184 status->pr_statussz = sizeof(elf_prstatus_t); 1185 status->pr_gregsetsz = sizeof(elf_gregset_t); 1186 status->pr_fpregsetsz = sizeof(elf_fpregset_t); 1187 status->pr_osreldate = osreldate; 1188 status->pr_cursig = p->p_sig; 1189 status->pr_pid = thr->td_tid; 1190#if defined(COMPAT_IA32) && __ELF_WORD_SIZE == 32 1191 fill_regs32(thr, &status->pr_reg); 1192 fill_fpregs32(thr, fpregset); 1193#else 1194 fill_regs(thr, &status->pr_reg); 1195 fill_fpregs(thr, fpregset); 1196#endif 1197 } 1198 __elfN(putnote)(dst, off, "FreeBSD", NT_PRSTATUS, status, 1199 sizeof *status); 1200 __elfN(putnote)(dst, off, "FreeBSD", NT_FPREGSET, fpregset, 1201 sizeof *fpregset); 1202 /* 1203 * Allow for MD specific notes, as well as any MD 1204 * specific preparations for writing MI notes. 1205 */ 1206 __elfN(dump_thread)(thr, dst, off); 1207 1208 thr = (thr == td) ? TAILQ_FIRST(&p->p_threads) : 1209 TAILQ_NEXT(thr, td_plist); 1210 if (thr == td) 1211 thr = TAILQ_NEXT(thr, td_plist); 1212 } 1213 1214 notesz = *off - noteoff; 1215 1216 if (dst != NULL) 1217 free(tempdata, M_TEMP); 1218 1219 /* Align up to a page boundary for the program segments. */ 1220 *off = round_page(*off); 1221 1222 if (dst != NULL) { 1223 Elf_Ehdr *ehdr; 1224 Elf_Phdr *phdr; 1225 struct phdr_closure phc; 1226 1227 /* 1228 * Fill in the ELF header. 1229 */ 1230 ehdr = (Elf_Ehdr *)((char *)dst + ehoff); 1231 ehdr->e_ident[EI_MAG0] = ELFMAG0; 1232 ehdr->e_ident[EI_MAG1] = ELFMAG1; 1233 ehdr->e_ident[EI_MAG2] = ELFMAG2; 1234 ehdr->e_ident[EI_MAG3] = ELFMAG3; 1235 ehdr->e_ident[EI_CLASS] = ELF_CLASS; 1236 ehdr->e_ident[EI_DATA] = ELF_DATA; 1237 ehdr->e_ident[EI_VERSION] = EV_CURRENT; 1238 ehdr->e_ident[EI_OSABI] = ELFOSABI_FREEBSD; 1239 ehdr->e_ident[EI_ABIVERSION] = 0; 1240 ehdr->e_ident[EI_PAD] = 0; 1241 ehdr->e_type = ET_CORE; 1242#if defined(COMPAT_IA32) && __ELF_WORD_SIZE == 32 1243 ehdr->e_machine = EM_386; 1244#else 1245 ehdr->e_machine = ELF_ARCH; 1246#endif 1247 ehdr->e_version = EV_CURRENT; 1248 ehdr->e_entry = 0; 1249 ehdr->e_phoff = phoff; 1250 ehdr->e_flags = 0; 1251 ehdr->e_ehsize = sizeof(Elf_Ehdr); 1252 ehdr->e_phentsize = sizeof(Elf_Phdr); 1253 ehdr->e_phnum = numsegs + 1; 1254 ehdr->e_shentsize = sizeof(Elf_Shdr); 1255 ehdr->e_shnum = 0; 1256 ehdr->e_shstrndx = SHN_UNDEF; 1257 1258 /* 1259 * Fill in the program header entries. 1260 */ 1261 phdr = (Elf_Phdr *)((char *)dst + phoff); 1262 1263 /* The note segement. */ 1264 phdr->p_type = PT_NOTE; 1265 phdr->p_offset = noteoff; 1266 phdr->p_vaddr = 0; 1267 phdr->p_paddr = 0; 1268 phdr->p_filesz = notesz; 1269 phdr->p_memsz = 0; 1270 phdr->p_flags = 0; 1271 phdr->p_align = 0; 1272 phdr++; 1273 1274 /* All the writable segments from the program. */ 1275 phc.phdr = phdr; 1276 phc.offset = *off; 1277 each_writable_segment(td, cb_put_phdr, &phc); 1278 } 1279} 1280 1281static void 1282__elfN(putnote)(void *dst, size_t *off, const char *name, int type, 1283 const void *desc, size_t descsz) 1284{ 1285 Elf_Note note; 1286 1287 note.n_namesz = strlen(name) + 1; 1288 note.n_descsz = descsz; 1289 note.n_type = type; 1290 if (dst != NULL) 1291 bcopy(¬e, (char *)dst + *off, sizeof note); 1292 *off += sizeof note; 1293 if (dst != NULL) 1294 bcopy(name, (char *)dst + *off, note.n_namesz); 1295 *off += roundup2(note.n_namesz, sizeof(Elf_Size)); 1296 if (dst != NULL) 1297 bcopy(desc, (char *)dst + *off, note.n_descsz); 1298 *off += roundup2(note.n_descsz, sizeof(Elf_Size)); 1299} 1300 1301/* 1302 * Tell kern_execve.c about it, with a little help from the linker. 1303 */ 1304static struct execsw __elfN(execsw) = { 1305 __CONCAT(exec_, __elfN(imgact)), 1306 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) 1307}; 1308EXEC_SET(__CONCAT(elf, __ELF_WORD_SIZE), __elfN(execsw)); 1309