Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/kern/imgact_elf.c
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1 /*- 2 * Copyright (c) 2000 David O'Brien 3 * Copyright (c) 1995-1996 Søren Schmidt 4 * Copyright (c) 1996 Peter Wemm 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer 12 * in this position and unchanged. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. The name of the author may not be used to endorse or promote products 17 * derived from this software without specific prior written permission 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD$"); 33 34 #include "opt_compat.h" 35 36 #include <sys/param.h> 37 #include <sys/exec.h> 38 #include <sys/fcntl.h> 39 #include <sys/imgact.h> 40 #include <sys/imgact_elf.h> 41 #include <sys/kernel.h> 42 #include <sys/lock.h> 43 #include <sys/malloc.h> 44 #include <sys/mount.h> 45 #include <sys/mutex.h> 46 #include <sys/mman.h> 47 #include <sys/namei.h> 48 #include <sys/pioctl.h> 49 #include <sys/proc.h> 50 #include <sys/procfs.h> 51 #include <sys/resourcevar.h> 52 #include <sys/sf_buf.h> 53 #include <sys/systm.h> 54 #include <sys/signalvar.h> 55 #include <sys/stat.h> 56 #include <sys/sx.h> 57 #include <sys/syscall.h> 58 #include <sys/sysctl.h> 59 #include <sys/sysent.h> 60 #include <sys/vnode.h> 61 62 #include <vm/vm.h> 63 #include <vm/vm_kern.h> 64 #include <vm/vm_param.h> 65 #include <vm/pmap.h> 66 #include <vm/vm_map.h> 67 #include <vm/vm_object.h> 68 #include <vm/vm_extern.h> 69 70 #include <machine/elf.h> 71 #include <machine/md_var.h> 72 73 #if defined(COMPAT_IA32) && __ELF_WORD_SIZE == 32 74 #include <machine/fpu.h> 75 #include <compat/ia32/ia32_reg.h> 76 #endif 77 78 #define OLD_EI_BRAND 8 79 80 static int __elfN(check_header)(const Elf_Ehdr *hdr); 81 static Elf_Brandinfo *__elfN(get_brandinfo)(struct image_params *imgp, 82 const char *interp, int32_t *osrel); 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 static boolean_t __elfN(check_note)(struct image_params *imgp, 90 Elf_Brandnote *checknote, int32_t *osrel); 91 92 SYSCTL_NODE(_kern, OID_AUTO, __CONCAT(elf, __ELF_WORD_SIZE), CTLFLAG_RW, 0, 93 ""); 94 95 int __elfN(fallback_brand) = -1; 96 SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO, 97 fallback_brand, CTLFLAG_RW, &__elfN(fallback_brand), 0, 98 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) " brand of last resort"); 99 TUNABLE_INT("kern.elf" __XSTRING(__ELF_WORD_SIZE) ".fallback_brand", 100 &__elfN(fallback_brand)); 101 102 static int elf_trace = 0; 103 SYSCTL_INT(_debug, OID_AUTO, __elfN(trace), CTLFLAG_RW, &elf_trace, 0, ""); 104 105 static int elf_legacy_coredump = 0; 106 SYSCTL_INT(_debug, OID_AUTO, __elfN(legacy_coredump), CTLFLAG_RW, 107 &elf_legacy_coredump, 0, ""); 108 109 static Elf_Brandinfo *elf_brand_list[MAX_BRANDS]; 110 111 #define trunc_page_ps(va, ps) ((va) & ~(ps - 1)) 112 #define round_page_ps(va, ps) (((va) + (ps - 1)) & ~(ps - 1)) 113 #define aligned(a, t) (trunc_page_ps((u_long)(a), sizeof(t)) == (u_long)(a)) 114 115 static const char FREEBSD_ABI_VENDOR[] = "FreeBSD"; 116 117 Elf_Brandnote __elfN(freebsd_brandnote) = { 118 .hdr.n_namesz = sizeof(FREEBSD_ABI_VENDOR), 119 .hdr.n_descsz = sizeof(int32_t), 120 .hdr.n_type = 1, 121 .vendor = FREEBSD_ABI_VENDOR, 122 .flags = BN_CAN_FETCH_OSREL 123 }; 124 125 int 126 __elfN(insert_brand_entry)(Elf_Brandinfo *entry) 127 { 128 int i; 129 130 for (i = 0; i < MAX_BRANDS; i++) { 131 if (elf_brand_list[i] == NULL) { 132 elf_brand_list[i] = entry; 133 break; 134 } 135 } 136 if (i == MAX_BRANDS) 137 return (-1); 138 return (0); 139 } 140 141 int 142 __elfN(remove_brand_entry)(Elf_Brandinfo *entry) 143 { 144 int i; 145 146 for (i = 0; i < MAX_BRANDS; i++) { 147 if (elf_brand_list[i] == entry) { 148 elf_brand_list[i] = NULL; 149 break; 150 } 151 } 152 if (i == MAX_BRANDS) 153 return (-1); 154 return (0); 155 } 156 157 int 158 __elfN(brand_inuse)(Elf_Brandinfo *entry) 159 { 160 struct proc *p; 161 int rval = FALSE; 162 163 sx_slock(&allproc_lock); 164 FOREACH_PROC_IN_SYSTEM(p) { 165 if (p->p_sysent == entry->sysvec) { 166 rval = TRUE; 167 break; 168 } 169 } 170 sx_sunlock(&allproc_lock); 171 172 return (rval); 173 } 174 175 static Elf_Brandinfo * 176 __elfN(get_brandinfo)(struct image_params *imgp, const char *interp, 177 int32_t *osrel) 178 { 179 const Elf_Ehdr *hdr = (const Elf_Ehdr *)imgp->image_header; 180 Elf_Brandinfo *bi; 181 boolean_t ret; 182 int i; 183 184 /* 185 * We support four types of branding -- (1) the ELF EI_OSABI field 186 * that SCO added to the ELF spec, (2) FreeBSD 3.x's traditional string 187 * branding w/in the ELF header, (3) path of the `interp_path' 188 * field, and (4) the ".note.ABI-tag" ELF section. 189 */ 190 191 /* Look for an ".note.ABI-tag" ELF section */ 192 for (i = 0; i < MAX_BRANDS; i++) { 193 bi = elf_brand_list[i]; 194 if (bi != NULL && hdr->e_machine == bi->machine && 195 (bi->flags & BI_BRAND_NOTE) != 0) { 196 ret = __elfN(check_note)(imgp, bi->brand_note, osrel); 197 if (ret) 198 return (bi); 199 } 200 } 201 202 /* If the executable has a brand, search for it in the brand list. */ 203 for (i = 0; i < MAX_BRANDS; i++) { 204 bi = elf_brand_list[i]; 205 if (bi != NULL && hdr->e_machine == bi->machine && 206 (hdr->e_ident[EI_OSABI] == bi->brand || 207 strncmp((const char *)&hdr->e_ident[OLD_EI_BRAND], 208 bi->compat_3_brand, strlen(bi->compat_3_brand)) == 0)) 209 return (bi); 210 } 211 212 /* Lacking a known brand, search for a recognized interpreter. */ 213 if (interp != NULL) { 214 for (i = 0; i < MAX_BRANDS; i++) { 215 bi = elf_brand_list[i]; 216 if (bi != NULL && hdr->e_machine == bi->machine && 217 strcmp(interp, bi->interp_path) == 0) 218 return (bi); 219 } 220 } 221 222 /* Lacking a recognized interpreter, try the default brand */ 223 for (i = 0; i < MAX_BRANDS; i++) { 224 bi = elf_brand_list[i]; 225 if (bi != NULL && hdr->e_machine == bi->machine && 226 __elfN(fallback_brand) == bi->brand) 227 return (bi); 228 } 229 return (NULL); 230 } 231 232 static int 233 __elfN(check_header)(const Elf_Ehdr *hdr) 234 { 235 Elf_Brandinfo *bi; 236 int i; 237 238 if (!IS_ELF(*hdr) || 239 hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS || 240 hdr->e_ident[EI_DATA] != ELF_TARG_DATA || 241 hdr->e_ident[EI_VERSION] != EV_CURRENT || 242 hdr->e_phentsize != sizeof(Elf_Phdr) || 243 hdr->e_version != ELF_TARG_VER) 244 return (ENOEXEC); 245 246 /* 247 * Make sure we have at least one brand for this machine. 248 */ 249 250 for (i = 0; i < MAX_BRANDS; i++) { 251 bi = elf_brand_list[i]; 252 if (bi != NULL && bi->machine == hdr->e_machine) 253 break; 254 } 255 if (i == MAX_BRANDS) 256 return (ENOEXEC); 257 258 return (0); 259 } 260 261 static int 262 __elfN(map_partial)(vm_map_t map, vm_object_t object, vm_ooffset_t offset, 263 vm_offset_t start, vm_offset_t end, vm_prot_t prot) 264 { 265 struct sf_buf *sf; 266 int error; 267 vm_offset_t off; 268 269 /* 270 * Create the page if it doesn't exist yet. Ignore errors. 271 */ 272 vm_map_lock(map); 273 vm_map_insert(map, NULL, 0, trunc_page(start), round_page(end), 274 VM_PROT_ALL, VM_PROT_ALL, 0); 275 vm_map_unlock(map); 276 277 /* 278 * Find the page from the underlying object. 279 */ 280 if (object) { 281 sf = vm_imgact_map_page(object, offset); 282 if (sf == NULL) 283 return (KERN_FAILURE); 284 off = offset - trunc_page(offset); 285 error = copyout((caddr_t)sf_buf_kva(sf) + off, (caddr_t)start, 286 end - start); 287 vm_imgact_unmap_page(sf); 288 if (error) { 289 return (KERN_FAILURE); 290 } 291 } 292 293 return (KERN_SUCCESS); 294 } 295 296 static int 297 __elfN(map_insert)(vm_map_t map, vm_object_t object, vm_ooffset_t offset, 298 vm_offset_t start, vm_offset_t end, vm_prot_t prot, int cow) 299 { 300 struct sf_buf *sf; 301 vm_offset_t off; 302 vm_size_t sz; 303 int error, rv; 304 305 if (start != trunc_page(start)) { 306 rv = __elfN(map_partial)(map, object, offset, start, 307 round_page(start), prot); 308 if (rv) 309 return (rv); 310 offset += round_page(start) - start; 311 start = round_page(start); 312 } 313 if (end != round_page(end)) { 314 rv = __elfN(map_partial)(map, object, offset + 315 trunc_page(end) - start, trunc_page(end), end, prot); 316 if (rv) 317 return (rv); 318 end = trunc_page(end); 319 } 320 if (end > start) { 321 if (offset & PAGE_MASK) { 322 /* 323 * The mapping is not page aligned. This means we have 324 * to copy the data. Sigh. 325 */ 326 rv = vm_map_find(map, NULL, 0, &start, end - start, 327 FALSE, prot | VM_PROT_WRITE, VM_PROT_ALL, 0); 328 if (rv) 329 return (rv); 330 if (object == NULL) 331 return (KERN_SUCCESS); 332 for (; start < end; start += sz) { 333 sf = vm_imgact_map_page(object, offset); 334 if (sf == NULL) 335 return (KERN_FAILURE); 336 off = offset - trunc_page(offset); 337 sz = end - start; 338 if (sz > PAGE_SIZE - off) 339 sz = PAGE_SIZE - off; 340 error = copyout((caddr_t)sf_buf_kva(sf) + off, 341 (caddr_t)start, sz); 342 vm_imgact_unmap_page(sf); 343 if (error) { 344 return (KERN_FAILURE); 345 } 346 offset += sz; 347 } 348 rv = KERN_SUCCESS; 349 } else { 350 vm_object_reference(object); 351 vm_map_lock(map); 352 rv = vm_map_insert(map, object, offset, start, end, 353 prot, VM_PROT_ALL, cow); 354 vm_map_unlock(map); 355 if (rv != KERN_SUCCESS) 356 vm_object_deallocate(object); 357 } 358 return (rv); 359 } else { 360 return (KERN_SUCCESS); 361 } 362 } 363 364 static int 365 __elfN(load_section)(struct vmspace *vmspace, 366 vm_object_t object, vm_offset_t offset, 367 caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot, 368 size_t pagesize) 369 { 370 struct sf_buf *sf; 371 size_t map_len; 372 vm_offset_t map_addr; 373 int error, rv, cow; 374 size_t copy_len; 375 vm_offset_t file_addr; 376 377 /* 378 * It's necessary to fail if the filsz + offset taken from the 379 * header is greater than the actual file pager object's size. 380 * If we were to allow this, then the vm_map_find() below would 381 * walk right off the end of the file object and into the ether. 382 * 383 * While I'm here, might as well check for something else that 384 * is invalid: filsz cannot be greater than memsz. 385 */ 386 if ((off_t)filsz + offset > object->un_pager.vnp.vnp_size || 387 filsz > memsz) { 388 uprintf("elf_load_section: truncated ELF file\n"); 389 return (ENOEXEC); 390 } 391 392 map_addr = trunc_page_ps((vm_offset_t)vmaddr, pagesize); 393 file_addr = trunc_page_ps(offset, pagesize); 394 395 /* 396 * We have two choices. We can either clear the data in the last page 397 * of an oversized mapping, or we can start the anon mapping a page 398 * early and copy the initialized data into that first page. We 399 * choose the second.. 400 */ 401 if (memsz > filsz) 402 map_len = trunc_page_ps(offset + filsz, pagesize) - file_addr; 403 else 404 map_len = round_page_ps(offset + filsz, pagesize) - file_addr; 405 406 if (map_len != 0) { 407 /* cow flags: don't dump readonly sections in core */ 408 cow = MAP_COPY_ON_WRITE | MAP_PREFAULT | 409 (prot & VM_PROT_WRITE ? 0 : MAP_DISABLE_COREDUMP); 410 411 rv = __elfN(map_insert)(&vmspace->vm_map, 412 object, 413 file_addr, /* file offset */ 414 map_addr, /* virtual start */ 415 map_addr + map_len,/* virtual end */ 416 prot, 417 cow); 418 if (rv != KERN_SUCCESS) 419 return (EINVAL); 420 421 /* we can stop now if we've covered it all */ 422 if (memsz == filsz) { 423 return (0); 424 } 425 } 426 427 428 /* 429 * We have to get the remaining bit of the file into the first part 430 * of the oversized map segment. This is normally because the .data 431 * segment in the file is extended to provide bss. It's a neat idea 432 * to try and save a page, but it's a pain in the behind to implement. 433 */ 434 copy_len = (offset + filsz) - trunc_page_ps(offset + filsz, pagesize); 435 map_addr = trunc_page_ps((vm_offset_t)vmaddr + filsz, pagesize); 436 map_len = round_page_ps((vm_offset_t)vmaddr + memsz, pagesize) - 437 map_addr; 438 439 /* This had damn well better be true! */ 440 if (map_len != 0) { 441 rv = __elfN(map_insert)(&vmspace->vm_map, NULL, 0, map_addr, 442 map_addr + map_len, VM_PROT_ALL, 0); 443 if (rv != KERN_SUCCESS) { 444 return (EINVAL); 445 } 446 } 447 448 if (copy_len != 0) { 449 vm_offset_t off; 450 451 sf = vm_imgact_map_page(object, offset + filsz); 452 if (sf == NULL) 453 return (EIO); 454 455 /* send the page fragment to user space */ 456 off = trunc_page_ps(offset + filsz, pagesize) - 457 trunc_page(offset + filsz); 458 error = copyout((caddr_t)sf_buf_kva(sf) + off, 459 (caddr_t)map_addr, copy_len); 460 vm_imgact_unmap_page(sf); 461 if (error) { 462 return (error); 463 } 464 } 465 466 /* 467 * set it to the specified protection. 468 * XXX had better undo the damage from pasting over the cracks here! 469 */ 470 vm_map_protect(&vmspace->vm_map, trunc_page(map_addr), 471 round_page(map_addr + map_len), prot, FALSE); 472 473 return (0); 474 } 475 476 /* 477 * Load the file "file" into memory. It may be either a shared object 478 * or an executable. 479 * 480 * The "addr" reference parameter is in/out. On entry, it specifies 481 * the address where a shared object should be loaded. If the file is 482 * an executable, this value is ignored. On exit, "addr" specifies 483 * where the file was actually loaded. 484 * 485 * The "entry" reference parameter is out only. On exit, it specifies 486 * the entry point for the loaded file. 487 */ 488 static int 489 __elfN(load_file)(struct proc *p, const char *file, u_long *addr, 490 u_long *entry, size_t pagesize) 491 { 492 struct { 493 struct nameidata nd; 494 struct vattr attr; 495 struct image_params image_params; 496 } *tempdata; 497 const Elf_Ehdr *hdr = NULL; 498 const Elf_Phdr *phdr = NULL; 499 struct nameidata *nd; 500 struct vmspace *vmspace = p->p_vmspace; 501 struct vattr *attr; 502 struct image_params *imgp; 503 vm_prot_t prot; 504 u_long rbase; 505 u_long base_addr = 0; 506 int vfslocked, error, i, numsegs; 507 508 if (curthread->td_proc != p) 509 panic("elf_load_file - thread"); /* XXXKSE DIAGNOSTIC */ 510 511 tempdata = malloc(sizeof(*tempdata), M_TEMP, M_WAITOK); 512 nd = &tempdata->nd; 513 attr = &tempdata->attr; 514 imgp = &tempdata->image_params; 515 516 /* 517 * Initialize part of the common data 518 */ 519 imgp->proc = p; 520 imgp->attr = attr; 521 imgp->firstpage = NULL; 522 imgp->image_header = NULL; 523 imgp->object = NULL; 524 imgp->execlabel = NULL; 525 526 /* XXXKSE */ 527 NDINIT(nd, LOOKUP, MPSAFE|LOCKLEAF|FOLLOW, UIO_SYSSPACE, file, 528 curthread); 529 vfslocked = 0; 530 if ((error = namei(nd)) != 0) { 531 nd->ni_vp = NULL; 532 goto fail; 533 } 534 vfslocked = NDHASGIANT(nd); 535 NDFREE(nd, NDF_ONLY_PNBUF); 536 imgp->vp = nd->ni_vp; 537 538 /* 539 * Check permissions, modes, uid, etc on the file, and "open" it. 540 */ 541 error = exec_check_permissions(imgp); 542 if (error) 543 goto fail; 544 545 error = exec_map_first_page(imgp); 546 if (error) 547 goto fail; 548 549 /* 550 * Also make certain that the interpreter stays the same, so set 551 * its VV_TEXT flag, too. 552 */ 553 nd->ni_vp->v_vflag |= VV_TEXT; 554 555 imgp->object = nd->ni_vp->v_object; 556 557 hdr = (const Elf_Ehdr *)imgp->image_header; 558 if ((error = __elfN(check_header)(hdr)) != 0) 559 goto fail; 560 if (hdr->e_type == ET_DYN) 561 rbase = *addr; 562 else if (hdr->e_type == ET_EXEC) 563 rbase = 0; 564 else { 565 error = ENOEXEC; 566 goto fail; 567 } 568 569 /* Only support headers that fit within first page for now */ 570 /* (multiplication of two Elf_Half fields will not overflow) */ 571 if ((hdr->e_phoff > PAGE_SIZE) || 572 (hdr->e_phentsize * hdr->e_phnum) > PAGE_SIZE - hdr->e_phoff) { 573 error = ENOEXEC; 574 goto fail; 575 } 576 577 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 578 if (!aligned(phdr, Elf_Addr)) { 579 error = ENOEXEC; 580 goto fail; 581 } 582 583 for (i = 0, numsegs = 0; i < hdr->e_phnum; i++) { 584 if (phdr[i].p_type == PT_LOAD) { /* Loadable segment */ 585 prot = 0; 586 if (phdr[i].p_flags & PF_X) 587 prot |= VM_PROT_EXECUTE; 588 if (phdr[i].p_flags & PF_W) 589 prot |= VM_PROT_WRITE; 590 if (phdr[i].p_flags & PF_R) 591 prot |= VM_PROT_READ; 592 593 if ((error = __elfN(load_section)(vmspace, 594 imgp->object, phdr[i].p_offset, 595 (caddr_t)(uintptr_t)phdr[i].p_vaddr + rbase, 596 phdr[i].p_memsz, phdr[i].p_filesz, prot, 597 pagesize)) != 0) 598 goto fail; 599 /* 600 * Establish the base address if this is the 601 * first segment. 602 */ 603 if (numsegs == 0) 604 base_addr = trunc_page(phdr[i].p_vaddr + 605 rbase); 606 numsegs++; 607 } 608 } 609 *addr = base_addr; 610 *entry = (unsigned long)hdr->e_entry + rbase; 611 612 fail: 613 if (imgp->firstpage) 614 exec_unmap_first_page(imgp); 615 616 if (nd->ni_vp) 617 vput(nd->ni_vp); 618 619 VFS_UNLOCK_GIANT(vfslocked); 620 free(tempdata, M_TEMP); 621 622 return (error); 623 } 624 625 static int 626 __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp) 627 { 628 const Elf_Ehdr *hdr = (const Elf_Ehdr *)imgp->image_header; 629 const Elf_Phdr *phdr; 630 Elf_Auxargs *elf_auxargs; 631 struct vmspace *vmspace; 632 vm_prot_t prot; 633 u_long text_size = 0, data_size = 0, total_size = 0; 634 u_long text_addr = 0, data_addr = 0; 635 u_long seg_size, seg_addr; 636 u_long addr, entry = 0, proghdr = 0; 637 int32_t osrel = 0; 638 int error = 0, i; 639 const char *interp = NULL, *newinterp = NULL; 640 Elf_Brandinfo *brand_info; 641 char *path; 642 struct thread *td = curthread; 643 struct sysentvec *sv; 644 645 /* 646 * Do we have a valid ELF header ? 647 * 648 * Only allow ET_EXEC & ET_DYN here, reject ET_DYN later 649 * if particular brand doesn't support it. 650 */ 651 if (__elfN(check_header)(hdr) != 0 || 652 (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN)) 653 return (-1); 654 655 /* 656 * From here on down, we return an errno, not -1, as we've 657 * detected an ELF file. 658 */ 659 660 if ((hdr->e_phoff > PAGE_SIZE) || 661 (hdr->e_phoff + hdr->e_phentsize * hdr->e_phnum) > PAGE_SIZE) { 662 /* Only support headers in first page for now */ 663 return (ENOEXEC); 664 } 665 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 666 if (!aligned(phdr, Elf_Addr)) 667 return (ENOEXEC); 668 for (i = 0; i < hdr->e_phnum; i++) { 669 if (phdr[i].p_type == PT_INTERP) { 670 /* Path to interpreter */ 671 if (phdr[i].p_filesz > MAXPATHLEN || 672 phdr[i].p_offset + phdr[i].p_filesz > PAGE_SIZE) 673 return (ENOEXEC); 674 interp = imgp->image_header + phdr[i].p_offset; 675 break; 676 } 677 } 678 679 brand_info = __elfN(get_brandinfo)(imgp, interp, &osrel); 680 if (brand_info == NULL) { 681 uprintf("ELF binary type \"%u\" not known.\n", 682 hdr->e_ident[EI_OSABI]); 683 return (ENOEXEC); 684 } 685 if (hdr->e_type == ET_DYN && 686 (brand_info->flags & BI_CAN_EXEC_DYN) == 0) 687 return (ENOEXEC); 688 sv = brand_info->sysvec; 689 if (interp != NULL && brand_info->interp_newpath != NULL) 690 newinterp = brand_info->interp_newpath; 691 692 /* 693 * Avoid a possible deadlock if the current address space is destroyed 694 * and that address space maps the locked vnode. In the common case, 695 * the locked vnode's v_usecount is decremented but remains greater 696 * than zero. Consequently, the vnode lock is not needed by vrele(). 697 * However, in cases where the vnode lock is external, such as nullfs, 698 * v_usecount may become zero. 699 */ 700 VOP_UNLOCK(imgp->vp, 0, td); 701 702 error = exec_new_vmspace(imgp, sv); 703 imgp->proc->p_sysent = sv; 704 705 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY, td); 706 if (error) 707 return (error); 708 709 vmspace = imgp->proc->p_vmspace; 710 711 for (i = 0; i < hdr->e_phnum; i++) { 712 switch (phdr[i].p_type) { 713 case PT_LOAD: /* Loadable segment */ 714 prot = 0; 715 if (phdr[i].p_flags & PF_X) 716 prot |= VM_PROT_EXECUTE; 717 if (phdr[i].p_flags & PF_W) 718 prot |= VM_PROT_WRITE; 719 if (phdr[i].p_flags & PF_R) 720 prot |= VM_PROT_READ; 721 722 #if defined(__ia64__) && __ELF_WORD_SIZE == 32 && defined(IA32_ME_HARDER) 723 /* 724 * Some x86 binaries assume read == executable, 725 * notably the M3 runtime and therefore cvsup 726 */ 727 if (prot & VM_PROT_READ) 728 prot |= VM_PROT_EXECUTE; 729 #endif 730 731 if ((error = __elfN(load_section)(vmspace, 732 imgp->object, phdr[i].p_offset, 733 (caddr_t)(uintptr_t)phdr[i].p_vaddr, 734 phdr[i].p_memsz, phdr[i].p_filesz, prot, 735 sv->sv_pagesize)) != 0) 736 return (error); 737 738 /* 739 * If this segment contains the program headers, 740 * remember their virtual address for the AT_PHDR 741 * aux entry. Static binaries don't usually include 742 * a PT_PHDR entry. 743 */ 744 if (phdr[i].p_offset == 0 && 745 hdr->e_phoff + hdr->e_phnum * hdr->e_phentsize 746 <= phdr[i].p_filesz) 747 proghdr = phdr[i].p_vaddr + hdr->e_phoff; 748 749 seg_addr = trunc_page(phdr[i].p_vaddr); 750 seg_size = round_page(phdr[i].p_memsz + 751 phdr[i].p_vaddr - seg_addr); 752 753 /* 754 * Is this .text or .data? We can't use 755 * VM_PROT_WRITE or VM_PROT_EXEC, it breaks the 756 * alpha terribly and possibly does other bad 757 * things so we stick to the old way of figuring 758 * it out: If the segment contains the program 759 * entry point, it's a text segment, otherwise it 760 * is a data segment. 761 * 762 * Note that obreak() assumes that data_addr + 763 * data_size == end of data load area, and the ELF 764 * file format expects segments to be sorted by 765 * address. If multiple data segments exist, the 766 * last one will be used. 767 */ 768 if (hdr->e_entry >= phdr[i].p_vaddr && 769 hdr->e_entry < (phdr[i].p_vaddr + 770 phdr[i].p_memsz)) { 771 text_size = seg_size; 772 text_addr = seg_addr; 773 entry = (u_long)hdr->e_entry; 774 } else { 775 data_size = seg_size; 776 data_addr = seg_addr; 777 } 778 total_size += seg_size; 779 break; 780 case PT_PHDR: /* Program header table info */ 781 proghdr = phdr[i].p_vaddr; 782 break; 783 default: 784 break; 785 } 786 } 787 788 if (data_addr == 0 && data_size == 0) { 789 data_addr = text_addr; 790 data_size = text_size; 791 } 792 793 /* 794 * Check limits. It should be safe to check the 795 * limits after loading the segments since we do 796 * not actually fault in all the segments pages. 797 */ 798 PROC_LOCK(imgp->proc); 799 if (data_size > lim_cur(imgp->proc, RLIMIT_DATA) || 800 text_size > maxtsiz || 801 total_size > lim_cur(imgp->proc, RLIMIT_VMEM)) { 802 PROC_UNLOCK(imgp->proc); 803 return (ENOMEM); 804 } 805 806 vmspace->vm_tsize = text_size >> PAGE_SHIFT; 807 vmspace->vm_taddr = (caddr_t)(uintptr_t)text_addr; 808 vmspace->vm_dsize = data_size >> PAGE_SHIFT; 809 vmspace->vm_daddr = (caddr_t)(uintptr_t)data_addr; 810 811 /* 812 * We load the dynamic linker where a userland call 813 * to mmap(0, ...) would put it. The rationale behind this 814 * calculation is that it leaves room for the heap to grow to 815 * its maximum allowed size. 816 */ 817 addr = round_page((vm_offset_t)imgp->proc->p_vmspace->vm_daddr + 818 lim_max(imgp->proc, RLIMIT_DATA)); 819 PROC_UNLOCK(imgp->proc); 820 821 imgp->entry_addr = entry; 822 823 if (interp != NULL) { 824 int have_interp = FALSE; 825 VOP_UNLOCK(imgp->vp, 0, td); 826 if (brand_info->emul_path != NULL && 827 brand_info->emul_path[0] != '\0') { 828 path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 829 snprintf(path, MAXPATHLEN, "%s%s", 830 brand_info->emul_path, interp); 831 error = __elfN(load_file)(imgp->proc, path, &addr, 832 &imgp->entry_addr, sv->sv_pagesize); 833 free(path, M_TEMP); 834 if (error == 0) 835 have_interp = TRUE; 836 } 837 if (!have_interp && newinterp != NULL) { 838 error = __elfN(load_file)(imgp->proc, newinterp, &addr, 839 &imgp->entry_addr, sv->sv_pagesize); 840 if (error == 0) 841 have_interp = TRUE; 842 } 843 if (!have_interp) { 844 error = __elfN(load_file)(imgp->proc, interp, &addr, 845 &imgp->entry_addr, sv->sv_pagesize); 846 } 847 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY, td); 848 if (error != 0) { 849 uprintf("ELF interpreter %s not found\n", interp); 850 return (error); 851 } 852 } else 853 addr = 0; 854 855 /* 856 * Construct auxargs table (used by the fixup routine) 857 */ 858 elf_auxargs = malloc(sizeof(Elf_Auxargs), M_TEMP, M_WAITOK); 859 elf_auxargs->execfd = -1; 860 elf_auxargs->phdr = proghdr; 861 elf_auxargs->phent = hdr->e_phentsize; 862 elf_auxargs->phnum = hdr->e_phnum; 863 elf_auxargs->pagesz = PAGE_SIZE; 864 elf_auxargs->base = addr; 865 elf_auxargs->flags = 0; 866 elf_auxargs->entry = entry; 867 elf_auxargs->trace = elf_trace; 868 869 imgp->auxargs = elf_auxargs; 870 imgp->interpreted = 0; 871 imgp->proc->p_osrel = osrel; 872 873 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->args->argc + imgp->args->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->args->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 int 940 __elfN(coredump)(td, vp, limit) 941 struct thread *td; 942 struct vnode *vp; 943 off_t limit; 944 { 945 struct ucred *cred = td->td_ucred; 946 int error = 0; 947 struct sseg_closure seginfo; 948 void *hdr; 949 size_t hdrsize; 950 951 /* Size the program segments. */ 952 seginfo.count = 0; 953 seginfo.size = 0; 954 each_writable_segment(td, cb_size_segment, &seginfo); 955 956 /* 957 * Calculate the size of the core file header area by making 958 * a dry run of generating it. Nothing is written, but the 959 * size is calculated. 960 */ 961 hdrsize = 0; 962 __elfN(puthdr)(td, (void *)NULL, &hdrsize, seginfo.count); 963 964 if (hdrsize + seginfo.size >= limit) 965 return (EFAULT); 966 967 /* 968 * Allocate memory for building the header, fill it up, 969 * and write it out. 970 */ 971 hdr = malloc(hdrsize, M_TEMP, M_WAITOK); 972 if (hdr == NULL) { 973 return (EINVAL); 974 } 975 error = __elfN(corehdr)(td, vp, cred, seginfo.count, hdr, hdrsize); 976 977 /* Write the contents of all of the writable segments. */ 978 if (error == 0) { 979 Elf_Phdr *php; 980 off_t offset; 981 int i; 982 983 php = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr)) + 1; 984 offset = hdrsize; 985 for (i = 0; i < seginfo.count; i++) { 986 error = vn_rdwr_inchunks(UIO_WRITE, vp, 987 (caddr_t)(uintptr_t)php->p_vaddr, 988 php->p_filesz, offset, UIO_USERSPACE, 989 IO_UNIT | IO_DIRECT, cred, NOCRED, NULL, 990 curthread); /* XXXKSE */ 991 if (error != 0) 992 break; 993 offset += php->p_filesz; 994 php++; 995 } 996 } 997 free(hdr, M_TEMP); 998 999 return (error); 1000 } 1001 1002 /* 1003 * A callback for each_writable_segment() to write out the segment's 1004 * program header entry. 1005 */ 1006 static void 1007 cb_put_phdr(entry, closure) 1008 vm_map_entry_t entry; 1009 void *closure; 1010 { 1011 struct phdr_closure *phc = (struct phdr_closure *)closure; 1012 Elf_Phdr *phdr = phc->phdr; 1013 1014 phc->offset = round_page(phc->offset); 1015 1016 phdr->p_type = PT_LOAD; 1017 phdr->p_offset = phc->offset; 1018 phdr->p_vaddr = entry->start; 1019 phdr->p_paddr = 0; 1020 phdr->p_filesz = phdr->p_memsz = entry->end - entry->start; 1021 phdr->p_align = PAGE_SIZE; 1022 phdr->p_flags = 0; 1023 if (entry->protection & VM_PROT_READ) 1024 phdr->p_flags |= PF_R; 1025 if (entry->protection & VM_PROT_WRITE) 1026 phdr->p_flags |= PF_W; 1027 if (entry->protection & VM_PROT_EXECUTE) 1028 phdr->p_flags |= PF_X; 1029 1030 phc->offset += phdr->p_filesz; 1031 phc->phdr++; 1032 } 1033 1034 /* 1035 * A callback for each_writable_segment() to gather information about 1036 * the number of segments and their total size. 1037 */ 1038 static void 1039 cb_size_segment(entry, closure) 1040 vm_map_entry_t entry; 1041 void *closure; 1042 { 1043 struct sseg_closure *ssc = (struct sseg_closure *)closure; 1044 1045 ssc->count++; 1046 ssc->size += entry->end - entry->start; 1047 } 1048 1049 /* 1050 * For each writable segment in the process's memory map, call the given 1051 * function with a pointer to the map entry and some arbitrary 1052 * caller-supplied data. 1053 */ 1054 static void 1055 each_writable_segment(td, func, closure) 1056 struct thread *td; 1057 segment_callback func; 1058 void *closure; 1059 { 1060 struct proc *p = td->td_proc; 1061 vm_map_t map = &p->p_vmspace->vm_map; 1062 vm_map_entry_t entry; 1063 vm_object_t backing_object, object; 1064 boolean_t ignore_entry; 1065 1066 vm_map_lock_read(map); 1067 for (entry = map->header.next; entry != &map->header; 1068 entry = entry->next) { 1069 /* 1070 * Don't dump inaccessible mappings, deal with legacy 1071 * coredump mode. 1072 * 1073 * Note that read-only segments related to the elf binary 1074 * are marked MAP_ENTRY_NOCOREDUMP now so we no longer 1075 * need to arbitrarily ignore such segments. 1076 */ 1077 if (elf_legacy_coredump) { 1078 if ((entry->protection & VM_PROT_RW) != VM_PROT_RW) 1079 continue; 1080 } else { 1081 if ((entry->protection & VM_PROT_ALL) == 0) 1082 continue; 1083 } 1084 1085 /* 1086 * Dont include memory segment in the coredump if 1087 * MAP_NOCORE is set in mmap(2) or MADV_NOCORE in 1088 * madvise(2). Do not dump submaps (i.e. parts of the 1089 * kernel map). 1090 */ 1091 if (entry->eflags & (MAP_ENTRY_NOCOREDUMP|MAP_ENTRY_IS_SUB_MAP)) 1092 continue; 1093 1094 if ((object = entry->object.vm_object) == NULL) 1095 continue; 1096 1097 /* Ignore memory-mapped devices and such things. */ 1098 VM_OBJECT_LOCK(object); 1099 while ((backing_object = object->backing_object) != NULL) { 1100 VM_OBJECT_LOCK(backing_object); 1101 VM_OBJECT_UNLOCK(object); 1102 object = backing_object; 1103 } 1104 ignore_entry = object->type != OBJT_DEFAULT && 1105 object->type != OBJT_SWAP && object->type != OBJT_VNODE; 1106 VM_OBJECT_UNLOCK(object); 1107 if (ignore_entry) 1108 continue; 1109 1110 (*func)(entry, closure); 1111 } 1112 vm_map_unlock_read(map); 1113 } 1114 1115 /* 1116 * Write the core file header to the file, including padding up to 1117 * the page boundary. 1118 */ 1119 static int 1120 __elfN(corehdr)(td, vp, cred, numsegs, hdr, hdrsize) 1121 struct thread *td; 1122 struct vnode *vp; 1123 struct ucred *cred; 1124 int numsegs; 1125 size_t hdrsize; 1126 void *hdr; 1127 { 1128 size_t off; 1129 1130 /* Fill in the header. */ 1131 bzero(hdr, hdrsize); 1132 off = 0; 1133 __elfN(puthdr)(td, hdr, &off, numsegs); 1134 1135 /* Write it to the core file. */ 1136 return (vn_rdwr_inchunks(UIO_WRITE, vp, hdr, hdrsize, (off_t)0, 1137 UIO_SYSSPACE, IO_UNIT | IO_DIRECT, cred, NOCRED, NULL, 1138 td)); /* XXXKSE */ 1139 } 1140 1141 #if defined(COMPAT_IA32) && __ELF_WORD_SIZE == 32 1142 typedef struct prstatus32 elf_prstatus_t; 1143 typedef struct prpsinfo32 elf_prpsinfo_t; 1144 typedef struct fpreg32 elf_prfpregset_t; 1145 typedef struct fpreg32 elf_fpregset_t; 1146 typedef struct reg32 elf_gregset_t; 1147 #else 1148 typedef prstatus_t elf_prstatus_t; 1149 typedef prpsinfo_t elf_prpsinfo_t; 1150 typedef prfpregset_t elf_prfpregset_t; 1151 typedef prfpregset_t elf_fpregset_t; 1152 typedef gregset_t elf_gregset_t; 1153 #endif 1154 1155 static void 1156 __elfN(puthdr)(struct thread *td, void *dst, size_t *off, int numsegs) 1157 { 1158 struct { 1159 elf_prstatus_t status; 1160 elf_prfpregset_t fpregset; 1161 elf_prpsinfo_t psinfo; 1162 } *tempdata; 1163 elf_prstatus_t *status; 1164 elf_prfpregset_t *fpregset; 1165 elf_prpsinfo_t *psinfo; 1166 struct proc *p; 1167 struct thread *thr; 1168 size_t ehoff, noteoff, notesz, phoff; 1169 1170 p = td->td_proc; 1171 1172 ehoff = *off; 1173 *off += sizeof(Elf_Ehdr); 1174 1175 phoff = *off; 1176 *off += (numsegs + 1) * sizeof(Elf_Phdr); 1177 1178 noteoff = *off; 1179 /* 1180 * Don't allocate space for the notes if we're just calculating 1181 * the size of the header. We also don't collect the data. 1182 */ 1183 if (dst != NULL) { 1184 tempdata = malloc(sizeof(*tempdata), M_TEMP, M_ZERO|M_WAITOK); 1185 status = &tempdata->status; 1186 fpregset = &tempdata->fpregset; 1187 psinfo = &tempdata->psinfo; 1188 } else { 1189 tempdata = NULL; 1190 status = NULL; 1191 fpregset = NULL; 1192 psinfo = NULL; 1193 } 1194 1195 if (dst != NULL) { 1196 psinfo->pr_version = PRPSINFO_VERSION; 1197 psinfo->pr_psinfosz = sizeof(elf_prpsinfo_t); 1198 strlcpy(psinfo->pr_fname, p->p_comm, sizeof(psinfo->pr_fname)); 1199 /* 1200 * XXX - We don't fill in the command line arguments properly 1201 * yet. 1202 */ 1203 strlcpy(psinfo->pr_psargs, p->p_comm, 1204 sizeof(psinfo->pr_psargs)); 1205 } 1206 __elfN(putnote)(dst, off, "FreeBSD", NT_PRPSINFO, psinfo, 1207 sizeof *psinfo); 1208 1209 /* 1210 * To have the debugger select the right thread (LWP) as the initial 1211 * thread, we dump the state of the thread passed to us in td first. 1212 * This is the thread that causes the core dump and thus likely to 1213 * be the right thread one wants to have selected in the debugger. 1214 */ 1215 thr = td; 1216 while (thr != NULL) { 1217 if (dst != NULL) { 1218 status->pr_version = PRSTATUS_VERSION; 1219 status->pr_statussz = sizeof(elf_prstatus_t); 1220 status->pr_gregsetsz = sizeof(elf_gregset_t); 1221 status->pr_fpregsetsz = sizeof(elf_fpregset_t); 1222 status->pr_osreldate = osreldate; 1223 status->pr_cursig = p->p_sig; 1224 status->pr_pid = thr->td_tid; 1225 #if defined(COMPAT_IA32) && __ELF_WORD_SIZE == 32 1226 fill_regs32(thr, &status->pr_reg); 1227 fill_fpregs32(thr, fpregset); 1228 #else 1229 fill_regs(thr, &status->pr_reg); 1230 fill_fpregs(thr, fpregset); 1231 #endif 1232 } 1233 __elfN(putnote)(dst, off, "FreeBSD", NT_PRSTATUS, status, 1234 sizeof *status); 1235 __elfN(putnote)(dst, off, "FreeBSD", NT_FPREGSET, fpregset, 1236 sizeof *fpregset); 1237 /* 1238 * Allow for MD specific notes, as well as any MD 1239 * specific preparations for writing MI notes. 1240 */ 1241 __elfN(dump_thread)(thr, dst, off); 1242 1243 thr = (thr == td) ? TAILQ_FIRST(&p->p_threads) : 1244 TAILQ_NEXT(thr, td_plist); 1245 if (thr == td) 1246 thr = TAILQ_NEXT(thr, td_plist); 1247 } 1248 1249 notesz = *off - noteoff; 1250 1251 if (dst != NULL) 1252 free(tempdata, M_TEMP); 1253 1254 /* Align up to a page boundary for the program segments. */ 1255 *off = round_page(*off); 1256 1257 if (dst != NULL) { 1258 Elf_Ehdr *ehdr; 1259 Elf_Phdr *phdr; 1260 struct phdr_closure phc; 1261 1262 /* 1263 * Fill in the ELF header. 1264 */ 1265 ehdr = (Elf_Ehdr *)((char *)dst + ehoff); 1266 ehdr->e_ident[EI_MAG0] = ELFMAG0; 1267 ehdr->e_ident[EI_MAG1] = ELFMAG1; 1268 ehdr->e_ident[EI_MAG2] = ELFMAG2; 1269 ehdr->e_ident[EI_MAG3] = ELFMAG3; 1270 ehdr->e_ident[EI_CLASS] = ELF_CLASS; 1271 ehdr->e_ident[EI_DATA] = ELF_DATA; 1272 ehdr->e_ident[EI_VERSION] = EV_CURRENT; 1273 ehdr->e_ident[EI_OSABI] = ELFOSABI_FREEBSD; 1274 ehdr->e_ident[EI_ABIVERSION] = 0; 1275 ehdr->e_ident[EI_PAD] = 0; 1276 ehdr->e_type = ET_CORE; 1277 #if defined(COMPAT_IA32) && __ELF_WORD_SIZE == 32 1278 ehdr->e_machine = EM_386; 1279 #else 1280 ehdr->e_machine = ELF_ARCH; 1281 #endif 1282 ehdr->e_version = EV_CURRENT; 1283 ehdr->e_entry = 0; 1284 ehdr->e_phoff = phoff; 1285 ehdr->e_flags = 0; 1286 ehdr->e_ehsize = sizeof(Elf_Ehdr); 1287 ehdr->e_phentsize = sizeof(Elf_Phdr); 1288 ehdr->e_phnum = numsegs + 1; 1289 ehdr->e_shentsize = sizeof(Elf_Shdr); 1290 ehdr->e_shnum = 0; 1291 ehdr->e_shstrndx = SHN_UNDEF; 1292 1293 /* 1294 * Fill in the program header entries. 1295 */ 1296 phdr = (Elf_Phdr *)((char *)dst + phoff); 1297 1298 /* The note segement. */ 1299 phdr->p_type = PT_NOTE; 1300 phdr->p_offset = noteoff; 1301 phdr->p_vaddr = 0; 1302 phdr->p_paddr = 0; 1303 phdr->p_filesz = notesz; 1304 phdr->p_memsz = 0; 1305 phdr->p_flags = 0; 1306 phdr->p_align = 0; 1307 phdr++; 1308 1309 /* All the writable segments from the program. */ 1310 phc.phdr = phdr; 1311 phc.offset = *off; 1312 each_writable_segment(td, cb_put_phdr, &phc); 1313 } 1314 } 1315 1316 static void 1317 __elfN(putnote)(void *dst, size_t *off, const char *name, int type, 1318 const void *desc, size_t descsz) 1319 { 1320 Elf_Note note; 1321 1322 note.n_namesz = strlen(name) + 1; 1323 note.n_descsz = descsz; 1324 note.n_type = type; 1325 if (dst != NULL) 1326 bcopy(¬e, (char *)dst + *off, sizeof note); 1327 *off += sizeof note; 1328 if (dst != NULL) 1329 bcopy(name, (char *)dst + *off, note.n_namesz); 1330 *off += roundup2(note.n_namesz, sizeof(Elf_Size)); 1331 if (dst != NULL) 1332 bcopy(desc, (char *)dst + *off, note.n_descsz); 1333 *off += roundup2(note.n_descsz, sizeof(Elf_Size)); 1334 } 1335 1336 /* 1337 * Try to find the appropriate ABI-note section for checknote, 1338 * fetch the osreldate for binary from the ELF OSABI-note. Only the 1339 * first page of the image is searched, the same as for headers. 1340 */ 1341 static boolean_t 1342 __elfN(check_note)(struct image_params *imgp, Elf_Brandnote *checknote, 1343 int32_t *osrel) 1344 { 1345 const Elf_Note *note, *note0, *note_end; 1346 const Elf_Phdr *phdr, *pnote; 1347 const Elf_Ehdr *hdr; 1348 const char *note_name; 1349 int i; 1350 1351 pnote = NULL; 1352 hdr = (const Elf_Ehdr *)imgp->image_header; 1353 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 1354 1355 for (i = 0; i < hdr->e_phnum; i++) { 1356 if (phdr[i].p_type == PT_NOTE) { 1357 pnote = &phdr[i]; 1358 break; 1359 } 1360 } 1361 1362 if (pnote == NULL || pnote->p_offset >= PAGE_SIZE || 1363 pnote->p_offset + pnote->p_filesz >= PAGE_SIZE) 1364 return (FALSE); 1365 1366 note = note0 = (const Elf_Note *)(imgp->image_header + pnote->p_offset); 1367 note_end = (const Elf_Note *)(imgp->image_header + 1368 pnote->p_offset + pnote->p_filesz); 1369 for (i = 0; i < 100 && note >= note0 && note < note_end; i++) { 1370 if (!aligned(note, Elf32_Addr)) 1371 return (FALSE); 1372 if (note->n_namesz != checknote->hdr.n_namesz || 1373 note->n_descsz != checknote->hdr.n_descsz || 1374 note->n_type != checknote->hdr.n_type) 1375 goto nextnote; 1376 note_name = (const char *)(note + 1); 1377 if (strncmp(checknote->vendor, note_name, 1378 checknote->hdr.n_namesz) != 0) 1379 goto nextnote; 1380 1381 /* 1382 * Fetch the osreldate for binary 1383 * from the ELF OSABI-note if necessary. 1384 */ 1385 if ((checknote->flags & BN_CAN_FETCH_OSREL) != 0 && 1386 osrel != NULL) 1387 *osrel = *(const int32_t *) (note_name + 1388 roundup2(checknote->hdr.n_namesz, 1389 sizeof(Elf32_Addr))); 1390 return (TRUE); 1391 1392 nextnote: 1393 note = (const Elf_Note *)((const char *)(note + 1) + 1394 roundup2(note->n_namesz, sizeof(Elf32_Addr)) + 1395 roundup2(note->n_descsz, sizeof(Elf32_Addr))); 1396 } 1397 1398 return (FALSE); 1399 } 1400 1401 /* 1402 * Tell kern_execve.c about it, with a little help from the linker. 1403 */ 1404 static struct execsw __elfN(execsw) = { 1405 __CONCAT(exec_, __elfN(imgact)), 1406 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) 1407 }; 1408 EXEC_SET(__CONCAT(elf, __ELF_WORD_SIZE), __elfN(execsw));
Cache object: 5d333b774a9cb092e4a531c848e07c8c
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