1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 2017 Dell EMC 5 * Copyright (c) 2000-2001, 2003 David O'Brien 6 * Copyright (c) 1995-1996 Søren Schmidt 7 * Copyright (c) 1996 Peter Wemm 8 * All rights reserved. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer 15 * in this position and unchanged. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. The name of the author may not be used to endorse or promote products 20 * derived from this software without specific prior written permission 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 #include <sys/cdefs.h> 35 __FBSDID("$FreeBSD$"); 36 37 #include "opt_capsicum.h" 38 39 #include <sys/param.h> 40 #include <sys/capsicum.h> 41 #include <sys/compressor.h> 42 #include <sys/exec.h> 43 #include <sys/fcntl.h> 44 #include <sys/imgact.h> 45 #include <sys/imgact_elf.h> 46 #include <sys/jail.h> 47 #include <sys/kernel.h> 48 #include <sys/lock.h> 49 #include <sys/malloc.h> 50 #include <sys/mount.h> 51 #include <sys/mman.h> 52 #include <sys/namei.h> 53 #include <sys/pioctl.h> 54 #include <sys/proc.h> 55 #include <sys/procfs.h> 56 #include <sys/ptrace.h> 57 #include <sys/racct.h> 58 #include <sys/resourcevar.h> 59 #include <sys/rwlock.h> 60 #include <sys/sbuf.h> 61 #include <sys/sf_buf.h> 62 #include <sys/smp.h> 63 #include <sys/systm.h> 64 #include <sys/signalvar.h> 65 #include <sys/stat.h> 66 #include <sys/sx.h> 67 #include <sys/syscall.h> 68 #include <sys/sysctl.h> 69 #include <sys/sysent.h> 70 #include <sys/vnode.h> 71 #include <sys/syslog.h> 72 #include <sys/eventhandler.h> 73 #include <sys/user.h> 74 75 #include <vm/vm.h> 76 #include <vm/vm_kern.h> 77 #include <vm/vm_param.h> 78 #include <vm/pmap.h> 79 #include <vm/vm_map.h> 80 #include <vm/vm_object.h> 81 #include <vm/vm_extern.h> 82 83 #include <machine/elf.h> 84 #include <machine/md_var.h> 85 86 #define ELF_NOTE_ROUNDSIZE 4 87 #define OLD_EI_BRAND 8 88 89 static int __elfN(check_header)(const Elf_Ehdr *hdr); 90 static Elf_Brandinfo *__elfN(get_brandinfo)(struct image_params *imgp, 91 const char *interp, int32_t *osrel, uint32_t *fctl0); 92 static int __elfN(load_file)(struct proc *p, const char *file, u_long *addr, 93 u_long *entry); 94 static int __elfN(load_section)(struct image_params *imgp, vm_ooffset_t offset, 95 caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot); 96 static int __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp); 97 static bool __elfN(freebsd_trans_osrel)(const Elf_Note *note, 98 int32_t *osrel); 99 static bool kfreebsd_trans_osrel(const Elf_Note *note, int32_t *osrel); 100 static boolean_t __elfN(check_note)(struct image_params *imgp, 101 Elf_Brandnote *checknote, int32_t *osrel, uint32_t *fctl0); 102 static vm_prot_t __elfN(trans_prot)(Elf_Word); 103 static Elf_Word __elfN(untrans_prot)(vm_prot_t); 104 105 SYSCTL_NODE(_kern, OID_AUTO, __CONCAT(elf, __ELF_WORD_SIZE), CTLFLAG_RW, 0, 106 ""); 107 108 #define CORE_BUF_SIZE (16 * 1024) 109 110 int __elfN(fallback_brand) = -1; 111 SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO, 112 fallback_brand, CTLFLAG_RWTUN, &__elfN(fallback_brand), 0, 113 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) " brand of last resort"); 114 115 static int elf_legacy_coredump = 0; 116 SYSCTL_INT(_debug, OID_AUTO, __elfN(legacy_coredump), CTLFLAG_RW, 117 &elf_legacy_coredump, 0, 118 "include all and only RW pages in core dumps"); 119 120 int __elfN(nxstack) = 121 #if defined(__amd64__) || defined(__powerpc64__) /* both 64 and 32 bit */ || \ 122 (defined(__arm__) && __ARM_ARCH >= 7) || defined(__aarch64__) || \ 123 defined(__riscv) 124 1; 125 #else 126 0; 127 #endif 128 SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO, 129 nxstack, CTLFLAG_RW, &__elfN(nxstack), 0, 130 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) ": enable non-executable stack"); 131 132 #if __ELF_WORD_SIZE == 32 && (defined(__amd64__) || defined(__i386__)) 133 int i386_read_exec = 0; 134 SYSCTL_INT(_kern_elf32, OID_AUTO, read_exec, CTLFLAG_RW, &i386_read_exec, 0, 135 "enable execution from readable segments"); 136 #endif 137 138 SYSCTL_NODE(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO, aslr, CTLFLAG_RW, 0, 139 ""); 140 #define ASLR_NODE_OID __CONCAT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), _aslr) 141 142 static int __elfN(aslr_enabled) = 0; 143 SYSCTL_INT(ASLR_NODE_OID, OID_AUTO, enable, CTLFLAG_RWTUN, 144 &__elfN(aslr_enabled), 0, 145 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) 146 ": enable address map randomization"); 147 148 static int __elfN(pie_aslr_enabled) = 0; 149 SYSCTL_INT(ASLR_NODE_OID, OID_AUTO, pie_enable, CTLFLAG_RWTUN, 150 &__elfN(pie_aslr_enabled), 0, 151 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) 152 ": enable address map randomization for PIE binaries"); 153 154 static int __elfN(aslr_honor_sbrk) = 1; 155 SYSCTL_INT(ASLR_NODE_OID, OID_AUTO, honor_sbrk, CTLFLAG_RW, 156 &__elfN(aslr_honor_sbrk), 0, 157 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) ": assume sbrk is used"); 158 159 static Elf_Brandinfo *elf_brand_list[MAX_BRANDS]; 160 161 #define aligned(a, t) (rounddown2((u_long)(a), sizeof(t)) == (u_long)(a)) 162 163 static const char FREEBSD_ABI_VENDOR[] = "FreeBSD"; 164 165 Elf_Brandnote __elfN(freebsd_brandnote) = { 166 .hdr.n_namesz = sizeof(FREEBSD_ABI_VENDOR), 167 .hdr.n_descsz = sizeof(int32_t), 168 .hdr.n_type = NT_FREEBSD_ABI_TAG, 169 .vendor = FREEBSD_ABI_VENDOR, 170 .flags = BN_TRANSLATE_OSREL, 171 .trans_osrel = __elfN(freebsd_trans_osrel) 172 }; 173 174 static bool 175 __elfN(freebsd_trans_osrel)(const Elf_Note *note, int32_t *osrel) 176 { 177 uintptr_t p; 178 179 p = (uintptr_t)(note + 1); 180 p += roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE); 181 *osrel = *(const int32_t *)(p); 182 183 return (true); 184 } 185 186 static const char GNU_ABI_VENDOR[] = "GNU"; 187 static int GNU_KFREEBSD_ABI_DESC = 3; 188 189 Elf_Brandnote __elfN(kfreebsd_brandnote) = { 190 .hdr.n_namesz = sizeof(GNU_ABI_VENDOR), 191 .hdr.n_descsz = 16, /* XXX at least 16 */ 192 .hdr.n_type = 1, 193 .vendor = GNU_ABI_VENDOR, 194 .flags = BN_TRANSLATE_OSREL, 195 .trans_osrel = kfreebsd_trans_osrel 196 }; 197 198 static bool 199 kfreebsd_trans_osrel(const Elf_Note *note, int32_t *osrel) 200 { 201 const Elf32_Word *desc; 202 uintptr_t p; 203 204 p = (uintptr_t)(note + 1); 205 p += roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE); 206 207 desc = (const Elf32_Word *)p; 208 if (desc[0] != GNU_KFREEBSD_ABI_DESC) 209 return (false); 210 211 /* 212 * Debian GNU/kFreeBSD embed the earliest compatible kernel version 213 * (__FreeBSD_version: <major><two digit minor>Rxx) in the LSB way. 214 */ 215 *osrel = desc[1] * 100000 + desc[2] * 1000 + desc[3]; 216 217 return (true); 218 } 219 220 int 221 __elfN(insert_brand_entry)(Elf_Brandinfo *entry) 222 { 223 int i; 224 225 for (i = 0; i < MAX_BRANDS; i++) { 226 if (elf_brand_list[i] == NULL) { 227 elf_brand_list[i] = entry; 228 break; 229 } 230 } 231 if (i == MAX_BRANDS) { 232 printf("WARNING: %s: could not insert brandinfo entry: %p\n", 233 __func__, entry); 234 return (-1); 235 } 236 return (0); 237 } 238 239 int 240 __elfN(remove_brand_entry)(Elf_Brandinfo *entry) 241 { 242 int i; 243 244 for (i = 0; i < MAX_BRANDS; i++) { 245 if (elf_brand_list[i] == entry) { 246 elf_brand_list[i] = NULL; 247 break; 248 } 249 } 250 if (i == MAX_BRANDS) 251 return (-1); 252 return (0); 253 } 254 255 int 256 __elfN(brand_inuse)(Elf_Brandinfo *entry) 257 { 258 struct proc *p; 259 int rval = FALSE; 260 261 sx_slock(&allproc_lock); 262 FOREACH_PROC_IN_SYSTEM(p) { 263 if (p->p_sysent == entry->sysvec) { 264 rval = TRUE; 265 break; 266 } 267 } 268 sx_sunlock(&allproc_lock); 269 270 return (rval); 271 } 272 273 static Elf_Brandinfo * 274 __elfN(get_brandinfo)(struct image_params *imgp, const char *interp, 275 int32_t *osrel, uint32_t *fctl0) 276 { 277 const Elf_Ehdr *hdr = (const Elf_Ehdr *)imgp->image_header; 278 Elf_Brandinfo *bi, *bi_m; 279 boolean_t ret; 280 int i, interp_name_len; 281 282 interp_name_len = interp != NULL ? strlen(interp) + 1 : 0; 283 284 /* 285 * We support four types of branding -- (1) the ELF EI_OSABI field 286 * that SCO added to the ELF spec, (2) FreeBSD 3.x's traditional string 287 * branding w/in the ELF header, (3) path of the `interp_path' 288 * field, and (4) the ".note.ABI-tag" ELF section. 289 */ 290 291 /* Look for an ".note.ABI-tag" ELF section */ 292 bi_m = NULL; 293 for (i = 0; i < MAX_BRANDS; i++) { 294 bi = elf_brand_list[i]; 295 if (bi == NULL) 296 continue; 297 if (interp != NULL && (bi->flags & BI_BRAND_ONLY_STATIC) != 0) 298 continue; 299 if (hdr->e_machine == bi->machine && (bi->flags & 300 (BI_BRAND_NOTE|BI_BRAND_NOTE_MANDATORY)) != 0) { 301 ret = __elfN(check_note)(imgp, bi->brand_note, osrel, 302 fctl0); 303 /* Give brand a chance to veto check_note's guess */ 304 if (ret && bi->header_supported) 305 ret = bi->header_supported(imgp); 306 /* 307 * If note checker claimed the binary, but the 308 * interpreter path in the image does not 309 * match default one for the brand, try to 310 * search for other brands with the same 311 * interpreter. Either there is better brand 312 * with the right interpreter, or, failing 313 * this, we return first brand which accepted 314 * our note and, optionally, header. 315 */ 316 if (ret && bi_m == NULL && interp != NULL && 317 (bi->interp_path == NULL || 318 (strlen(bi->interp_path) + 1 != interp_name_len || 319 strncmp(interp, bi->interp_path, interp_name_len) 320 != 0))) { 321 bi_m = bi; 322 ret = 0; 323 } 324 if (ret) 325 return (bi); 326 } 327 } 328 if (bi_m != NULL) 329 return (bi_m); 330 331 /* If the executable has a brand, search for it in the brand list. */ 332 for (i = 0; i < MAX_BRANDS; i++) { 333 bi = elf_brand_list[i]; 334 if (bi == NULL || (bi->flags & BI_BRAND_NOTE_MANDATORY) != 0 || 335 (interp != NULL && (bi->flags & BI_BRAND_ONLY_STATIC) != 0)) 336 continue; 337 if (hdr->e_machine == bi->machine && 338 (hdr->e_ident[EI_OSABI] == bi->brand || 339 (bi->compat_3_brand != NULL && 340 strcmp((const char *)&hdr->e_ident[OLD_EI_BRAND], 341 bi->compat_3_brand) == 0))) { 342 /* Looks good, but give brand a chance to veto */ 343 if (bi->header_supported == NULL || 344 bi->header_supported(imgp)) { 345 /* 346 * Again, prefer strictly matching 347 * interpreter path. 348 */ 349 if (interp_name_len == 0 && 350 bi->interp_path == NULL) 351 return (bi); 352 if (bi->interp_path != NULL && 353 strlen(bi->interp_path) + 1 == 354 interp_name_len && strncmp(interp, 355 bi->interp_path, interp_name_len) == 0) 356 return (bi); 357 if (bi_m == NULL) 358 bi_m = bi; 359 } 360 } 361 } 362 if (bi_m != NULL) 363 return (bi_m); 364 365 /* No known brand, see if the header is recognized by any brand */ 366 for (i = 0; i < MAX_BRANDS; i++) { 367 bi = elf_brand_list[i]; 368 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY || 369 bi->header_supported == NULL) 370 continue; 371 if (hdr->e_machine == bi->machine) { 372 ret = bi->header_supported(imgp); 373 if (ret) 374 return (bi); 375 } 376 } 377 378 /* Lacking a known brand, search for a recognized interpreter. */ 379 if (interp != NULL) { 380 for (i = 0; i < MAX_BRANDS; i++) { 381 bi = elf_brand_list[i]; 382 if (bi == NULL || (bi->flags & 383 (BI_BRAND_NOTE_MANDATORY | BI_BRAND_ONLY_STATIC)) 384 != 0) 385 continue; 386 if (hdr->e_machine == bi->machine && 387 bi->interp_path != NULL && 388 /* ELF image p_filesz includes terminating zero */ 389 strlen(bi->interp_path) + 1 == interp_name_len && 390 strncmp(interp, bi->interp_path, interp_name_len) 391 == 0 && (bi->header_supported == NULL || 392 bi->header_supported(imgp))) 393 return (bi); 394 } 395 } 396 397 /* Lacking a recognized interpreter, try the default brand */ 398 for (i = 0; i < MAX_BRANDS; i++) { 399 bi = elf_brand_list[i]; 400 if (bi == NULL || (bi->flags & BI_BRAND_NOTE_MANDATORY) != 0 || 401 (interp != NULL && (bi->flags & BI_BRAND_ONLY_STATIC) != 0)) 402 continue; 403 if (hdr->e_machine == bi->machine && 404 __elfN(fallback_brand) == bi->brand && 405 (bi->header_supported == NULL || 406 bi->header_supported(imgp))) 407 return (bi); 408 } 409 return (NULL); 410 } 411 412 static int 413 __elfN(check_header)(const Elf_Ehdr *hdr) 414 { 415 Elf_Brandinfo *bi; 416 int i; 417 418 if (!IS_ELF(*hdr) || 419 hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS || 420 hdr->e_ident[EI_DATA] != ELF_TARG_DATA || 421 hdr->e_ident[EI_VERSION] != EV_CURRENT || 422 hdr->e_phentsize != sizeof(Elf_Phdr) || 423 hdr->e_version != ELF_TARG_VER) 424 return (ENOEXEC); 425 426 /* 427 * Make sure we have at least one brand for this machine. 428 */ 429 430 for (i = 0; i < MAX_BRANDS; i++) { 431 bi = elf_brand_list[i]; 432 if (bi != NULL && bi->machine == hdr->e_machine) 433 break; 434 } 435 if (i == MAX_BRANDS) 436 return (ENOEXEC); 437 438 return (0); 439 } 440 441 static int 442 __elfN(map_partial)(vm_map_t map, vm_object_t object, vm_ooffset_t offset, 443 vm_offset_t start, vm_offset_t end, vm_prot_t prot) 444 { 445 struct sf_buf *sf; 446 int error; 447 vm_offset_t off; 448 449 /* 450 * Create the page if it doesn't exist yet. Ignore errors. 451 */ 452 vm_map_fixed(map, NULL, 0, trunc_page(start), round_page(end) - 453 trunc_page(start), VM_PROT_ALL, VM_PROT_ALL, MAP_CHECK_EXCL); 454 455 /* 456 * Find the page from the underlying object. 457 */ 458 if (object != NULL) { 459 sf = vm_imgact_map_page(object, offset); 460 if (sf == NULL) 461 return (KERN_FAILURE); 462 off = offset - trunc_page(offset); 463 error = copyout((caddr_t)sf_buf_kva(sf) + off, (caddr_t)start, 464 end - start); 465 vm_imgact_unmap_page(sf); 466 if (error != 0) 467 return (KERN_FAILURE); 468 } 469 470 return (KERN_SUCCESS); 471 } 472 473 static int 474 __elfN(map_insert)(struct image_params *imgp, vm_map_t map, vm_object_t object, 475 vm_ooffset_t offset, vm_offset_t start, vm_offset_t end, vm_prot_t prot, 476 int cow) 477 { 478 struct sf_buf *sf; 479 vm_offset_t off; 480 vm_size_t sz; 481 int error, locked, rv; 482 483 if (start != trunc_page(start)) { 484 rv = __elfN(map_partial)(map, object, offset, start, 485 round_page(start), prot); 486 if (rv != KERN_SUCCESS) 487 return (rv); 488 offset += round_page(start) - start; 489 start = round_page(start); 490 } 491 if (end != round_page(end)) { 492 rv = __elfN(map_partial)(map, object, offset + 493 trunc_page(end) - start, trunc_page(end), end, prot); 494 if (rv != KERN_SUCCESS) 495 return (rv); 496 end = trunc_page(end); 497 } 498 if (start >= end) 499 return (KERN_SUCCESS); 500 if ((offset & PAGE_MASK) != 0) { 501 /* 502 * The mapping is not page aligned. This means that we have 503 * to copy the data. 504 */ 505 rv = vm_map_fixed(map, NULL, 0, start, end - start, 506 prot | VM_PROT_WRITE, VM_PROT_ALL, MAP_CHECK_EXCL); 507 if (rv != KERN_SUCCESS) 508 return (rv); 509 if (object == NULL) 510 return (KERN_SUCCESS); 511 for (; start < end; start += sz) { 512 sf = vm_imgact_map_page(object, offset); 513 if (sf == NULL) 514 return (KERN_FAILURE); 515 off = offset - trunc_page(offset); 516 sz = end - start; 517 if (sz > PAGE_SIZE - off) 518 sz = PAGE_SIZE - off; 519 error = copyout((caddr_t)sf_buf_kva(sf) + off, 520 (caddr_t)start, sz); 521 vm_imgact_unmap_page(sf); 522 if (error != 0) 523 return (KERN_FAILURE); 524 offset += sz; 525 } 526 } else { 527 vm_object_reference(object); 528 rv = vm_map_fixed(map, object, offset, start, end - start, 529 prot, VM_PROT_ALL, cow | MAP_CHECK_EXCL | 530 (object != NULL ? MAP_VN_EXEC : 0)); 531 if (rv != KERN_SUCCESS) { 532 locked = VOP_ISLOCKED(imgp->vp); 533 VOP_UNLOCK(imgp->vp, 0); 534 vm_object_deallocate(object); 535 vn_lock(imgp->vp, locked | LK_RETRY); 536 return (rv); 537 } else if (object != NULL) { 538 MPASS(imgp->vp->v_object == object); 539 VOP_SET_TEXT_CHECKED(imgp->vp); 540 } 541 } 542 return (KERN_SUCCESS); 543 } 544 545 static int 546 __elfN(load_section)(struct image_params *imgp, vm_ooffset_t offset, 547 caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot) 548 { 549 struct sf_buf *sf; 550 size_t map_len; 551 vm_map_t map; 552 vm_object_t object; 553 vm_offset_t map_addr; 554 int error, rv, cow; 555 size_t copy_len; 556 vm_ooffset_t file_addr; 557 558 /* 559 * It's necessary to fail if the filsz + offset taken from the 560 * header is greater than the actual file pager object's size. 561 * If we were to allow this, then the vm_map_find() below would 562 * walk right off the end of the file object and into the ether. 563 * 564 * While I'm here, might as well check for something else that 565 * is invalid: filsz cannot be greater than memsz. 566 */ 567 if ((filsz != 0 && (off_t)filsz + offset > imgp->attr->va_size) || 568 filsz > memsz) { 569 uprintf("elf_load_section: truncated ELF file\n"); 570 return (ENOEXEC); 571 } 572 573 object = imgp->object; 574 map = &imgp->proc->p_vmspace->vm_map; 575 map_addr = trunc_page((vm_offset_t)vmaddr); 576 file_addr = trunc_page(offset); 577 578 /* 579 * We have two choices. We can either clear the data in the last page 580 * of an oversized mapping, or we can start the anon mapping a page 581 * early and copy the initialized data into that first page. We 582 * choose the second. 583 */ 584 if (filsz == 0) 585 map_len = 0; 586 else if (memsz > filsz) 587 map_len = trunc_page(offset + filsz) - file_addr; 588 else 589 map_len = round_page(offset + filsz) - file_addr; 590 591 if (map_len != 0) { 592 /* cow flags: don't dump readonly sections in core */ 593 cow = MAP_COPY_ON_WRITE | MAP_PREFAULT | 594 (prot & VM_PROT_WRITE ? 0 : MAP_DISABLE_COREDUMP); 595 596 rv = __elfN(map_insert)(imgp, map, object, file_addr, 597 map_addr, map_addr + map_len, prot, cow); 598 if (rv != KERN_SUCCESS) 599 return (EINVAL); 600 601 /* we can stop now if we've covered it all */ 602 if (memsz == filsz) 603 return (0); 604 } 605 606 607 /* 608 * We have to get the remaining bit of the file into the first part 609 * of the oversized map segment. This is normally because the .data 610 * segment in the file is extended to provide bss. It's a neat idea 611 * to try and save a page, but it's a pain in the behind to implement. 612 */ 613 copy_len = filsz == 0 ? 0 : (offset + filsz) - trunc_page(offset + 614 filsz); 615 map_addr = trunc_page((vm_offset_t)vmaddr + filsz); 616 map_len = round_page((vm_offset_t)vmaddr + memsz) - map_addr; 617 618 /* This had damn well better be true! */ 619 if (map_len != 0) { 620 rv = __elfN(map_insert)(imgp, map, NULL, 0, map_addr, 621 map_addr + map_len, prot, 0); 622 if (rv != KERN_SUCCESS) 623 return (EINVAL); 624 } 625 626 if (copy_len != 0) { 627 sf = vm_imgact_map_page(object, offset + filsz); 628 if (sf == NULL) 629 return (EIO); 630 631 /* send the page fragment to user space */ 632 error = copyout((caddr_t)sf_buf_kva(sf), (caddr_t)map_addr, 633 copy_len); 634 vm_imgact_unmap_page(sf); 635 if (error != 0) 636 return (error); 637 } 638 639 /* 640 * Remove write access to the page if it was only granted by map_insert 641 * to allow copyout. 642 */ 643 if ((prot & VM_PROT_WRITE) == 0) 644 vm_map_protect(map, trunc_page(map_addr), round_page(map_addr + 645 map_len), prot, FALSE); 646 647 return (0); 648 } 649 650 static int 651 __elfN(load_sections)(struct image_params *imgp, const Elf_Ehdr *hdr, 652 const Elf_Phdr *phdr, u_long rbase, u_long *base_addrp) 653 { 654 vm_prot_t prot; 655 u_long base_addr; 656 bool first; 657 int error, i; 658 659 ASSERT_VOP_LOCKED(imgp->vp, __func__); 660 661 base_addr = 0; 662 first = true; 663 664 for (i = 0; i < hdr->e_phnum; i++) { 665 if (phdr[i].p_type != PT_LOAD || phdr[i].p_memsz == 0) 666 continue; 667 668 /* Loadable segment */ 669 prot = __elfN(trans_prot)(phdr[i].p_flags); 670 error = __elfN(load_section)(imgp, phdr[i].p_offset, 671 (caddr_t)(uintptr_t)phdr[i].p_vaddr + rbase, 672 phdr[i].p_memsz, phdr[i].p_filesz, prot); 673 if (error != 0) 674 return (error); 675 676 /* 677 * Establish the base address if this is the first segment. 678 */ 679 if (first) { 680 base_addr = trunc_page(phdr[i].p_vaddr + rbase); 681 first = false; 682 } 683 } 684 685 if (base_addrp != NULL) 686 *base_addrp = base_addr; 687 688 return (0); 689 } 690 691 /* 692 * Load the file "file" into memory. It may be either a shared object 693 * or an executable. 694 * 695 * The "addr" reference parameter is in/out. On entry, it specifies 696 * the address where a shared object should be loaded. If the file is 697 * an executable, this value is ignored. On exit, "addr" specifies 698 * where the file was actually loaded. 699 * 700 * The "entry" reference parameter is out only. On exit, it specifies 701 * the entry point for the loaded file. 702 */ 703 static int 704 __elfN(load_file)(struct proc *p, const char *file, u_long *addr, 705 u_long *entry) 706 { 707 struct { 708 struct nameidata nd; 709 struct vattr attr; 710 struct image_params image_params; 711 } *tempdata; 712 const Elf_Ehdr *hdr = NULL; 713 const Elf_Phdr *phdr = NULL; 714 struct nameidata *nd; 715 struct vattr *attr; 716 struct image_params *imgp; 717 u_long rbase; 718 u_long base_addr = 0; 719 int error; 720 721 #ifdef CAPABILITY_MODE 722 /* 723 * XXXJA: This check can go away once we are sufficiently confident 724 * that the checks in namei() are correct. 725 */ 726 if (IN_CAPABILITY_MODE(curthread)) 727 return (ECAPMODE); 728 #endif 729 730 tempdata = malloc(sizeof(*tempdata), M_TEMP, M_WAITOK); 731 nd = &tempdata->nd; 732 attr = &tempdata->attr; 733 imgp = &tempdata->image_params; 734 735 /* 736 * Initialize part of the common data 737 */ 738 imgp->proc = p; 739 imgp->attr = attr; 740 imgp->firstpage = NULL; 741 imgp->image_header = NULL; 742 imgp->object = NULL; 743 imgp->execlabel = NULL; 744 745 NDINIT(nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF, UIO_SYSSPACE, file, 746 curthread); 747 if ((error = namei(nd)) != 0) { 748 nd->ni_vp = NULL; 749 goto fail; 750 } 751 NDFREE(nd, NDF_ONLY_PNBUF); 752 imgp->vp = nd->ni_vp; 753 754 /* 755 * Check permissions, modes, uid, etc on the file, and "open" it. 756 */ 757 error = exec_check_permissions(imgp); 758 if (error) 759 goto fail; 760 761 error = exec_map_first_page(imgp); 762 if (error) 763 goto fail; 764 765 imgp->object = nd->ni_vp->v_object; 766 767 hdr = (const Elf_Ehdr *)imgp->image_header; 768 if ((error = __elfN(check_header)(hdr)) != 0) 769 goto fail; 770 if (hdr->e_type == ET_DYN) 771 rbase = *addr; 772 else if (hdr->e_type == ET_EXEC) 773 rbase = 0; 774 else { 775 error = ENOEXEC; 776 goto fail; 777 } 778 779 /* Only support headers that fit within first page for now */ 780 if ((hdr->e_phoff > PAGE_SIZE) || 781 (u_int)hdr->e_phentsize * hdr->e_phnum > PAGE_SIZE - hdr->e_phoff) { 782 error = ENOEXEC; 783 goto fail; 784 } 785 786 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 787 if (!aligned(phdr, Elf_Addr)) { 788 error = ENOEXEC; 789 goto fail; 790 } 791 792 error = __elfN(load_sections)(imgp, hdr, phdr, rbase, &base_addr); 793 if (error != 0) 794 goto fail; 795 796 *addr = base_addr; 797 *entry = (unsigned long)hdr->e_entry + rbase; 798 799 fail: 800 if (imgp->firstpage) 801 exec_unmap_first_page(imgp); 802 803 if (nd->ni_vp) { 804 if (imgp->textset) 805 VOP_UNSET_TEXT_CHECKED(nd->ni_vp); 806 vput(nd->ni_vp); 807 } 808 free(tempdata, M_TEMP); 809 810 return (error); 811 } 812 813 static u_long 814 __CONCAT(rnd_, __elfN(base))(vm_map_t map __unused, u_long minv, u_long maxv, 815 u_int align) 816 { 817 u_long rbase, res; 818 819 MPASS(vm_map_min(map) <= minv); 820 MPASS(maxv <= vm_map_max(map)); 821 MPASS(minv < maxv); 822 MPASS(minv + align < maxv); 823 arc4rand(&rbase, sizeof(rbase), 0); 824 res = roundup(minv, (u_long)align) + rbase % (maxv - minv); 825 res &= ~((u_long)align - 1); 826 if (res >= maxv) 827 res -= align; 828 KASSERT(res >= minv, 829 ("res %#lx < minv %#lx, maxv %#lx rbase %#lx", 830 res, minv, maxv, rbase)); 831 KASSERT(res < maxv, 832 ("res %#lx > maxv %#lx, minv %#lx rbase %#lx", 833 res, maxv, minv, rbase)); 834 return (res); 835 } 836 837 static int 838 __elfN(enforce_limits)(struct image_params *imgp, const Elf_Ehdr *hdr, 839 const Elf_Phdr *phdr, u_long et_dyn_addr) 840 { 841 struct vmspace *vmspace; 842 const char *err_str; 843 u_long text_size, data_size, total_size, text_addr, data_addr; 844 u_long seg_size, seg_addr; 845 int i; 846 847 err_str = NULL; 848 text_size = data_size = total_size = text_addr = data_addr = 0; 849 850 for (i = 0; i < hdr->e_phnum; i++) { 851 if (phdr[i].p_type != PT_LOAD || phdr[i].p_memsz == 0) 852 continue; 853 854 seg_addr = trunc_page(phdr[i].p_vaddr + et_dyn_addr); 855 seg_size = round_page(phdr[i].p_memsz + 856 phdr[i].p_vaddr + et_dyn_addr - seg_addr); 857 858 /* 859 * Make the largest executable segment the official 860 * text segment and all others data. 861 * 862 * Note that obreak() assumes that data_addr + data_size == end 863 * of data load area, and the ELF file format expects segments 864 * to be sorted by address. If multiple data segments exist, 865 * the last one will be used. 866 */ 867 868 if ((phdr[i].p_flags & PF_X) != 0 && text_size < seg_size) { 869 text_size = seg_size; 870 text_addr = seg_addr; 871 } else { 872 data_size = seg_size; 873 data_addr = seg_addr; 874 } 875 total_size += seg_size; 876 } 877 878 if (data_addr == 0 && data_size == 0) { 879 data_addr = text_addr; 880 data_size = text_size; 881 } 882 883 /* 884 * Check limits. It should be safe to check the 885 * limits after loading the segments since we do 886 * not actually fault in all the segments pages. 887 */ 888 PROC_LOCK(imgp->proc); 889 if (data_size > lim_cur_proc(imgp->proc, RLIMIT_DATA)) 890 err_str = "Data segment size exceeds process limit"; 891 else if (text_size > maxtsiz) 892 err_str = "Text segment size exceeds system limit"; 893 else if (total_size > lim_cur_proc(imgp->proc, RLIMIT_VMEM)) 894 err_str = "Total segment size exceeds process limit"; 895 else if (racct_set(imgp->proc, RACCT_DATA, data_size) != 0) 896 err_str = "Data segment size exceeds resource limit"; 897 else if (racct_set(imgp->proc, RACCT_VMEM, total_size) != 0) 898 err_str = "Total segment size exceeds resource limit"; 899 PROC_UNLOCK(imgp->proc); 900 if (err_str != NULL) { 901 uprintf("%s\n", err_str); 902 return (ENOMEM); 903 } 904 905 vmspace = imgp->proc->p_vmspace; 906 vmspace->vm_tsize = text_size >> PAGE_SHIFT; 907 vmspace->vm_taddr = (caddr_t)(uintptr_t)text_addr; 908 vmspace->vm_dsize = data_size >> PAGE_SHIFT; 909 vmspace->vm_daddr = (caddr_t)(uintptr_t)data_addr; 910 911 return (0); 912 } 913 914 static int 915 __elfN(get_interp)(struct image_params *imgp, const Elf_Phdr *phdr, 916 char **interpp, bool *free_interpp) 917 { 918 struct thread *td; 919 char *interp; 920 int error, interp_name_len; 921 922 KASSERT(phdr->p_type == PT_INTERP, 923 ("%s: p_type %u != PT_INTERP", __func__, phdr->p_type)); 924 ASSERT_VOP_LOCKED(imgp->vp, __func__); 925 926 td = curthread; 927 928 /* Path to interpreter */ 929 if (phdr->p_filesz < 2 || phdr->p_filesz > MAXPATHLEN) { 930 uprintf("Invalid PT_INTERP\n"); 931 return (ENOEXEC); 932 } 933 934 interp_name_len = phdr->p_filesz; 935 if (phdr->p_offset > PAGE_SIZE || 936 interp_name_len > PAGE_SIZE - phdr->p_offset) { 937 /* 938 * The vnode lock might be needed by the pagedaemon to 939 * clean pages owned by the vnode. Do not allow sleep 940 * waiting for memory with the vnode locked, instead 941 * try non-sleepable allocation first, and if it 942 * fails, go to the slow path were we drop the lock 943 * and do M_WAITOK. A text reference prevents 944 * modifications to the vnode content. 945 */ 946 interp = malloc(interp_name_len + 1, M_TEMP, M_NOWAIT); 947 if (interp == NULL) { 948 VOP_UNLOCK(imgp->vp, 0); 949 interp = malloc(interp_name_len + 1, M_TEMP, M_WAITOK); 950 vn_lock(imgp->vp, LK_SHARED | LK_RETRY); 951 } 952 953 error = vn_rdwr(UIO_READ, imgp->vp, interp, 954 interp_name_len, phdr->p_offset, 955 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, 956 NOCRED, NULL, td); 957 if (error != 0) { 958 free(interp, M_TEMP); 959 uprintf("i/o error PT_INTERP %d\n", error); 960 return (error); 961 } 962 interp[interp_name_len] = '\0'; 963 964 *interpp = interp; 965 *free_interpp = true; 966 return (0); 967 } 968 969 interp = __DECONST(char *, imgp->image_header) + phdr->p_offset; 970 if (interp[interp_name_len - 1] != '\0') { 971 uprintf("Invalid PT_INTERP\n"); 972 return (ENOEXEC); 973 } 974 975 *interpp = interp; 976 *free_interpp = false; 977 return (0); 978 } 979 980 static int 981 __elfN(load_interp)(struct image_params *imgp, const Elf_Brandinfo *brand_info, 982 const char *interp, u_long *addr, u_long *entry) 983 { 984 char *path; 985 int error; 986 987 if (brand_info->emul_path != NULL && 988 brand_info->emul_path[0] != '\0') { 989 path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 990 snprintf(path, MAXPATHLEN, "%s%s", 991 brand_info->emul_path, interp); 992 error = __elfN(load_file)(imgp->proc, path, addr, entry); 993 free(path, M_TEMP); 994 if (error == 0) 995 return (0); 996 } 997 998 if (brand_info->interp_newpath != NULL && 999 (brand_info->interp_path == NULL || 1000 strcmp(interp, brand_info->interp_path) == 0)) { 1001 error = __elfN(load_file)(imgp->proc, 1002 brand_info->interp_newpath, addr, entry); 1003 if (error == 0) 1004 return (0); 1005 } 1006 1007 error = __elfN(load_file)(imgp->proc, interp, addr, entry); 1008 if (error == 0) 1009 return (0); 1010 1011 uprintf("ELF interpreter %s not found, error %d\n", interp, error); 1012 return (error); 1013 } 1014 1015 /* 1016 * Impossible et_dyn_addr initial value indicating that the real base 1017 * must be calculated later with some randomization applied. 1018 */ 1019 #define ET_DYN_ADDR_RAND 1 1020 1021 static int 1022 __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp) 1023 { 1024 struct thread *td; 1025 const Elf_Ehdr *hdr; 1026 const Elf_Phdr *phdr; 1027 Elf_Auxargs *elf_auxargs; 1028 struct vmspace *vmspace; 1029 vm_map_t map; 1030 char *interp; 1031 Elf_Brandinfo *brand_info; 1032 struct sysentvec *sv; 1033 u_long addr, baddr, et_dyn_addr, entry, proghdr; 1034 u_long maxalign, mapsz, maxv, maxv1; 1035 uint32_t fctl0; 1036 int32_t osrel; 1037 bool free_interp; 1038 int error, i, n; 1039 1040 hdr = (const Elf_Ehdr *)imgp->image_header; 1041 1042 /* 1043 * Do we have a valid ELF header ? 1044 * 1045 * Only allow ET_EXEC & ET_DYN here, reject ET_DYN later 1046 * if particular brand doesn't support it. 1047 */ 1048 if (__elfN(check_header)(hdr) != 0 || 1049 (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN)) 1050 return (-1); 1051 1052 /* 1053 * From here on down, we return an errno, not -1, as we've 1054 * detected an ELF file. 1055 */ 1056 1057 if ((hdr->e_phoff > PAGE_SIZE) || 1058 (u_int)hdr->e_phentsize * hdr->e_phnum > PAGE_SIZE - hdr->e_phoff) { 1059 /* Only support headers in first page for now */ 1060 uprintf("Program headers not in the first page\n"); 1061 return (ENOEXEC); 1062 } 1063 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 1064 if (!aligned(phdr, Elf_Addr)) { 1065 uprintf("Unaligned program headers\n"); 1066 return (ENOEXEC); 1067 } 1068 1069 n = error = 0; 1070 baddr = 0; 1071 osrel = 0; 1072 fctl0 = 0; 1073 entry = proghdr = 0; 1074 interp = NULL; 1075 free_interp = false; 1076 td = curthread; 1077 maxalign = PAGE_SIZE; 1078 mapsz = 0; 1079 1080 for (i = 0; i < hdr->e_phnum; i++) { 1081 switch (phdr[i].p_type) { 1082 case PT_LOAD: 1083 if (n == 0) 1084 baddr = phdr[i].p_vaddr; 1085 if (phdr[i].p_align > maxalign) 1086 maxalign = phdr[i].p_align; 1087 mapsz += phdr[i].p_memsz; 1088 n++; 1089 1090 /* 1091 * If this segment contains the program headers, 1092 * remember their virtual address for the AT_PHDR 1093 * aux entry. Static binaries don't usually include 1094 * a PT_PHDR entry. 1095 */ 1096 if (phdr[i].p_offset == 0 && 1097 hdr->e_phoff + hdr->e_phnum * hdr->e_phentsize 1098 <= phdr[i].p_filesz) 1099 proghdr = phdr[i].p_vaddr + hdr->e_phoff; 1100 break; 1101 case PT_INTERP: 1102 /* Path to interpreter */ 1103 if (interp != NULL) { 1104 uprintf("Multiple PT_INTERP headers\n"); 1105 error = ENOEXEC; 1106 goto ret; 1107 } 1108 error = __elfN(get_interp)(imgp, &phdr[i], &interp, 1109 &free_interp); 1110 if (error != 0) 1111 goto ret; 1112 break; 1113 case PT_GNU_STACK: 1114 if (__elfN(nxstack)) 1115 imgp->stack_prot = 1116 __elfN(trans_prot)(phdr[i].p_flags); 1117 imgp->stack_sz = phdr[i].p_memsz; 1118 break; 1119 case PT_PHDR: /* Program header table info */ 1120 proghdr = phdr[i].p_vaddr; 1121 break; 1122 } 1123 } 1124 1125 brand_info = __elfN(get_brandinfo)(imgp, interp, &osrel, &fctl0); 1126 if (brand_info == NULL) { 1127 uprintf("ELF binary type \"%u\" not known.\n", 1128 hdr->e_ident[EI_OSABI]); 1129 error = ENOEXEC; 1130 goto ret; 1131 } 1132 sv = brand_info->sysvec; 1133 et_dyn_addr = 0; 1134 if (hdr->e_type == ET_DYN) { 1135 if ((brand_info->flags & BI_CAN_EXEC_DYN) == 0) { 1136 uprintf("Cannot execute shared object\n"); 1137 error = ENOEXEC; 1138 goto ret; 1139 } 1140 /* 1141 * Honour the base load address from the dso if it is 1142 * non-zero for some reason. 1143 */ 1144 if (baddr == 0) { 1145 if ((sv->sv_flags & SV_ASLR) == 0 || 1146 (fctl0 & NT_FREEBSD_FCTL_ASLR_DISABLE) != 0) 1147 et_dyn_addr = ET_DYN_LOAD_ADDR; 1148 else if ((__elfN(pie_aslr_enabled) && 1149 (imgp->proc->p_flag2 & P2_ASLR_DISABLE) == 0) || 1150 (imgp->proc->p_flag2 & P2_ASLR_ENABLE) != 0) 1151 et_dyn_addr = ET_DYN_ADDR_RAND; 1152 else 1153 et_dyn_addr = ET_DYN_LOAD_ADDR; 1154 } 1155 } 1156 1157 /* 1158 * Avoid a possible deadlock if the current address space is destroyed 1159 * and that address space maps the locked vnode. In the common case, 1160 * the locked vnode's v_usecount is decremented but remains greater 1161 * than zero. Consequently, the vnode lock is not needed by vrele(). 1162 * However, in cases where the vnode lock is external, such as nullfs, 1163 * v_usecount may become zero. 1164 * 1165 * The VV_TEXT flag prevents modifications to the executable while 1166 * the vnode is unlocked. 1167 */ 1168 VOP_UNLOCK(imgp->vp, 0); 1169 1170 /* 1171 * Decide whether to enable randomization of user mappings. 1172 * First, reset user preferences for the setid binaries. 1173 * Then, account for the support of the randomization by the 1174 * ABI, by user preferences, and make special treatment for 1175 * PIE binaries. 1176 */ 1177 if (imgp->credential_setid) { 1178 PROC_LOCK(imgp->proc); 1179 imgp->proc->p_flag2 &= ~(P2_ASLR_ENABLE | P2_ASLR_DISABLE); 1180 PROC_UNLOCK(imgp->proc); 1181 } 1182 if ((sv->sv_flags & SV_ASLR) == 0 || 1183 (imgp->proc->p_flag2 & P2_ASLR_DISABLE) != 0 || 1184 (fctl0 & NT_FREEBSD_FCTL_ASLR_DISABLE) != 0) { 1185 KASSERT(et_dyn_addr != ET_DYN_ADDR_RAND, 1186 ("et_dyn_addr == RAND and !ASLR")); 1187 } else if ((imgp->proc->p_flag2 & P2_ASLR_ENABLE) != 0 || 1188 (__elfN(aslr_enabled) && hdr->e_type == ET_EXEC) || 1189 et_dyn_addr == ET_DYN_ADDR_RAND) { 1190 imgp->map_flags |= MAP_ASLR; 1191 /* 1192 * If user does not care about sbrk, utilize the bss 1193 * grow region for mappings as well. We can select 1194 * the base for the image anywere and still not suffer 1195 * from the fragmentation. 1196 */ 1197 if (!__elfN(aslr_honor_sbrk) || 1198 (imgp->proc->p_flag2 & P2_ASLR_IGNSTART) != 0) 1199 imgp->map_flags |= MAP_ASLR_IGNSTART; 1200 } 1201 1202 error = exec_new_vmspace(imgp, sv); 1203 vmspace = imgp->proc->p_vmspace; 1204 map = &vmspace->vm_map; 1205 1206 imgp->proc->p_sysent = sv; 1207 1208 maxv = vm_map_max(map) - lim_max(td, RLIMIT_STACK); 1209 if (et_dyn_addr == ET_DYN_ADDR_RAND) { 1210 KASSERT((map->flags & MAP_ASLR) != 0, 1211 ("ET_DYN_ADDR_RAND but !MAP_ASLR")); 1212 et_dyn_addr = __CONCAT(rnd_, __elfN(base))(map, 1213 vm_map_min(map) + mapsz + lim_max(td, RLIMIT_DATA), 1214 /* reserve half of the address space to interpreter */ 1215 maxv / 2, 1UL << flsl(maxalign)); 1216 } 1217 1218 vn_lock(imgp->vp, LK_SHARED | LK_RETRY); 1219 if (error != 0) 1220 goto ret; 1221 1222 error = __elfN(load_sections)(imgp, hdr, phdr, et_dyn_addr, NULL); 1223 if (error != 0) 1224 goto ret; 1225 1226 error = __elfN(enforce_limits)(imgp, hdr, phdr, et_dyn_addr); 1227 if (error != 0) 1228 goto ret; 1229 1230 entry = (u_long)hdr->e_entry + et_dyn_addr; 1231 1232 /* 1233 * We load the dynamic linker where a userland call 1234 * to mmap(0, ...) would put it. The rationale behind this 1235 * calculation is that it leaves room for the heap to grow to 1236 * its maximum allowed size. 1237 */ 1238 addr = round_page((vm_offset_t)vmspace->vm_daddr + lim_max(td, 1239 RLIMIT_DATA)); 1240 if ((map->flags & MAP_ASLR) != 0) { 1241 maxv1 = maxv / 2 + addr / 2; 1242 MPASS(maxv1 >= addr); /* No overflow */ 1243 map->anon_loc = __CONCAT(rnd_, __elfN(base))(map, addr, maxv1, 1244 MAXPAGESIZES > 1 ? pagesizes[1] : pagesizes[0]); 1245 } else { 1246 map->anon_loc = addr; 1247 } 1248 1249 imgp->entry_addr = entry; 1250 1251 if (interp != NULL) { 1252 VOP_UNLOCK(imgp->vp, 0); 1253 if ((map->flags & MAP_ASLR) != 0) { 1254 /* Assume that interpeter fits into 1/4 of AS */ 1255 maxv1 = maxv / 2 + addr / 2; 1256 MPASS(maxv1 >= addr); /* No overflow */ 1257 addr = __CONCAT(rnd_, __elfN(base))(map, addr, 1258 maxv1, PAGE_SIZE); 1259 } 1260 error = __elfN(load_interp)(imgp, brand_info, interp, &addr, 1261 &imgp->entry_addr); 1262 vn_lock(imgp->vp, LK_SHARED | LK_RETRY); 1263 if (error != 0) 1264 goto ret; 1265 } else 1266 addr = et_dyn_addr; 1267 1268 /* 1269 * Construct auxargs table (used by the fixup routine) 1270 */ 1271 elf_auxargs = malloc(sizeof(Elf_Auxargs), M_TEMP, M_NOWAIT); 1272 if (elf_auxargs == NULL) { 1273 VOP_UNLOCK(imgp->vp, 0); 1274 elf_auxargs = malloc(sizeof(Elf_Auxargs), M_TEMP, M_WAITOK); 1275 vn_lock(imgp->vp, LK_SHARED | LK_RETRY); 1276 } 1277 elf_auxargs->execfd = -1; 1278 elf_auxargs->phdr = proghdr + et_dyn_addr; 1279 elf_auxargs->phent = hdr->e_phentsize; 1280 elf_auxargs->phnum = hdr->e_phnum; 1281 elf_auxargs->pagesz = PAGE_SIZE; 1282 elf_auxargs->base = addr; 1283 elf_auxargs->flags = 0; 1284 elf_auxargs->entry = entry; 1285 elf_auxargs->hdr_eflags = hdr->e_flags; 1286 1287 imgp->auxargs = elf_auxargs; 1288 imgp->interpreted = 0; 1289 imgp->reloc_base = addr; 1290 imgp->proc->p_osrel = osrel; 1291 imgp->proc->p_fctl0 = fctl0; 1292 imgp->proc->p_elf_machine = hdr->e_machine; 1293 imgp->proc->p_elf_flags = hdr->e_flags; 1294 1295 ret: 1296 if (free_interp) 1297 free(interp, M_TEMP); 1298 return (error); 1299 } 1300 1301 #define suword __CONCAT(suword, __ELF_WORD_SIZE) 1302 1303 int 1304 __elfN(freebsd_fixup)(register_t **stack_base, struct image_params *imgp) 1305 { 1306 Elf_Auxargs *args = (Elf_Auxargs *)imgp->auxargs; 1307 Elf_Auxinfo *argarray, *pos; 1308 Elf_Addr *base, *auxbase; 1309 int error; 1310 1311 base = (Elf_Addr *)*stack_base; 1312 auxbase = base + imgp->args->argc + 1 + imgp->args->envc + 1; 1313 argarray = pos = malloc(AT_COUNT * sizeof(*pos), M_TEMP, 1314 M_WAITOK | M_ZERO); 1315 1316 if (args->execfd != -1) 1317 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd); 1318 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr); 1319 AUXARGS_ENTRY(pos, AT_PHENT, args->phent); 1320 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum); 1321 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz); 1322 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags); 1323 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry); 1324 AUXARGS_ENTRY(pos, AT_BASE, args->base); 1325 AUXARGS_ENTRY(pos, AT_EHDRFLAGS, args->hdr_eflags); 1326 if (imgp->execpathp != 0) 1327 AUXARGS_ENTRY(pos, AT_EXECPATH, imgp->execpathp); 1328 AUXARGS_ENTRY(pos, AT_OSRELDATE, 1329 imgp->proc->p_ucred->cr_prison->pr_osreldate); 1330 if (imgp->canary != 0) { 1331 AUXARGS_ENTRY(pos, AT_CANARY, imgp->canary); 1332 AUXARGS_ENTRY(pos, AT_CANARYLEN, imgp->canarylen); 1333 } 1334 AUXARGS_ENTRY(pos, AT_NCPUS, mp_ncpus); 1335 if (imgp->pagesizes != 0) { 1336 AUXARGS_ENTRY(pos, AT_PAGESIZES, imgp->pagesizes); 1337 AUXARGS_ENTRY(pos, AT_PAGESIZESLEN, imgp->pagesizeslen); 1338 } 1339 if (imgp->sysent->sv_timekeep_base != 0) { 1340 AUXARGS_ENTRY(pos, AT_TIMEKEEP, 1341 imgp->sysent->sv_timekeep_base); 1342 } 1343 AUXARGS_ENTRY(pos, AT_STACKPROT, imgp->sysent->sv_shared_page_obj 1344 != NULL && imgp->stack_prot != 0 ? imgp->stack_prot : 1345 imgp->sysent->sv_stackprot); 1346 if (imgp->sysent->sv_hwcap != NULL) 1347 AUXARGS_ENTRY(pos, AT_HWCAP, *imgp->sysent->sv_hwcap); 1348 if (imgp->sysent->sv_hwcap2 != NULL) 1349 AUXARGS_ENTRY(pos, AT_HWCAP2, *imgp->sysent->sv_hwcap2); 1350 AUXARGS_ENTRY(pos, AT_NULL, 0); 1351 1352 free(imgp->auxargs, M_TEMP); 1353 imgp->auxargs = NULL; 1354 KASSERT(pos - argarray <= AT_COUNT, ("Too many auxargs")); 1355 1356 error = copyout(argarray, auxbase, sizeof(*argarray) * AT_COUNT); 1357 free(argarray, M_TEMP); 1358 if (error != 0) 1359 return (error); 1360 1361 base--; 1362 if (suword(base, imgp->args->argc) == -1) 1363 return (EFAULT); 1364 *stack_base = (register_t *)base; 1365 return (0); 1366 } 1367 1368 /* 1369 * Code for generating ELF core dumps. 1370 */ 1371 1372 typedef void (*segment_callback)(vm_map_entry_t, void *); 1373 1374 /* Closure for cb_put_phdr(). */ 1375 struct phdr_closure { 1376 Elf_Phdr *phdr; /* Program header to fill in */ 1377 Elf_Off offset; /* Offset of segment in core file */ 1378 }; 1379 1380 /* Closure for cb_size_segment(). */ 1381 struct sseg_closure { 1382 int count; /* Count of writable segments. */ 1383 size_t size; /* Total size of all writable segments. */ 1384 }; 1385 1386 typedef void (*outfunc_t)(void *, struct sbuf *, size_t *); 1387 1388 struct note_info { 1389 int type; /* Note type. */ 1390 outfunc_t outfunc; /* Output function. */ 1391 void *outarg; /* Argument for the output function. */ 1392 size_t outsize; /* Output size. */ 1393 TAILQ_ENTRY(note_info) link; /* Link to the next note info. */ 1394 }; 1395 1396 TAILQ_HEAD(note_info_list, note_info); 1397 1398 /* Coredump output parameters. */ 1399 struct coredump_params { 1400 off_t offset; 1401 struct ucred *active_cred; 1402 struct ucred *file_cred; 1403 struct thread *td; 1404 struct vnode *vp; 1405 struct compressor *comp; 1406 }; 1407 1408 extern int compress_user_cores; 1409 extern int compress_user_cores_level; 1410 1411 static void cb_put_phdr(vm_map_entry_t, void *); 1412 static void cb_size_segment(vm_map_entry_t, void *); 1413 static int core_write(struct coredump_params *, const void *, size_t, off_t, 1414 enum uio_seg); 1415 static void each_dumpable_segment(struct thread *, segment_callback, void *); 1416 static int __elfN(corehdr)(struct coredump_params *, int, void *, size_t, 1417 struct note_info_list *, size_t); 1418 static void __elfN(prepare_notes)(struct thread *, struct note_info_list *, 1419 size_t *); 1420 static void __elfN(puthdr)(struct thread *, void *, size_t, int, size_t); 1421 static void __elfN(putnote)(struct note_info *, struct sbuf *); 1422 static size_t register_note(struct note_info_list *, int, outfunc_t, void *); 1423 static int sbuf_drain_core_output(void *, const char *, int); 1424 1425 static void __elfN(note_fpregset)(void *, struct sbuf *, size_t *); 1426 static void __elfN(note_prpsinfo)(void *, struct sbuf *, size_t *); 1427 static void __elfN(note_prstatus)(void *, struct sbuf *, size_t *); 1428 static void __elfN(note_threadmd)(void *, struct sbuf *, size_t *); 1429 static void __elfN(note_thrmisc)(void *, struct sbuf *, size_t *); 1430 static void __elfN(note_ptlwpinfo)(void *, struct sbuf *, size_t *); 1431 static void __elfN(note_procstat_auxv)(void *, struct sbuf *, size_t *); 1432 static void __elfN(note_procstat_proc)(void *, struct sbuf *, size_t *); 1433 static void __elfN(note_procstat_psstrings)(void *, struct sbuf *, size_t *); 1434 static void note_procstat_files(void *, struct sbuf *, size_t *); 1435 static void note_procstat_groups(void *, struct sbuf *, size_t *); 1436 static void note_procstat_osrel(void *, struct sbuf *, size_t *); 1437 static void note_procstat_rlimit(void *, struct sbuf *, size_t *); 1438 static void note_procstat_umask(void *, struct sbuf *, size_t *); 1439 static void note_procstat_vmmap(void *, struct sbuf *, size_t *); 1440 1441 /* 1442 * Write out a core segment to the compression stream. 1443 */ 1444 static int 1445 compress_chunk(struct coredump_params *p, char *base, char *buf, u_int len) 1446 { 1447 u_int chunk_len; 1448 int error; 1449 1450 while (len > 0) { 1451 chunk_len = MIN(len, CORE_BUF_SIZE); 1452 1453 /* 1454 * We can get EFAULT error here. 1455 * In that case zero out the current chunk of the segment. 1456 */ 1457 error = copyin(base, buf, chunk_len); 1458 if (error != 0) 1459 bzero(buf, chunk_len); 1460 error = compressor_write(p->comp, buf, chunk_len); 1461 if (error != 0) 1462 break; 1463 base += chunk_len; 1464 len -= chunk_len; 1465 } 1466 return (error); 1467 } 1468 1469 static int 1470 core_compressed_write(void *base, size_t len, off_t offset, void *arg) 1471 { 1472 1473 return (core_write((struct coredump_params *)arg, base, len, offset, 1474 UIO_SYSSPACE)); 1475 } 1476 1477 static int 1478 core_write(struct coredump_params *p, const void *base, size_t len, 1479 off_t offset, enum uio_seg seg) 1480 { 1481 1482 return (vn_rdwr_inchunks(UIO_WRITE, p->vp, __DECONST(void *, base), 1483 len, offset, seg, IO_UNIT | IO_DIRECT | IO_RANGELOCKED, 1484 p->active_cred, p->file_cred, NULL, p->td)); 1485 } 1486 1487 static int 1488 core_output(void *base, size_t len, off_t offset, struct coredump_params *p, 1489 void *tmpbuf) 1490 { 1491 int error; 1492 1493 if (p->comp != NULL) 1494 return (compress_chunk(p, base, tmpbuf, len)); 1495 1496 /* 1497 * EFAULT is a non-fatal error that we can get, for example, 1498 * if the segment is backed by a file but extends beyond its 1499 * end. 1500 */ 1501 error = core_write(p, base, len, offset, UIO_USERSPACE); 1502 if (error == EFAULT) { 1503 log(LOG_WARNING, "Failed to fully fault in a core file segment " 1504 "at VA %p with size 0x%zx to be written at offset 0x%jx " 1505 "for process %s\n", base, len, offset, curproc->p_comm); 1506 1507 /* 1508 * Write a "real" zero byte at the end of the target region 1509 * in the case this is the last segment. 1510 * The intermediate space will be implicitly zero-filled. 1511 */ 1512 error = core_write(p, zero_region, 1, offset + len - 1, 1513 UIO_SYSSPACE); 1514 } 1515 return (error); 1516 } 1517 1518 /* 1519 * Drain into a core file. 1520 */ 1521 static int 1522 sbuf_drain_core_output(void *arg, const char *data, int len) 1523 { 1524 struct coredump_params *p; 1525 int error, locked; 1526 1527 p = (struct coredump_params *)arg; 1528 1529 /* 1530 * Some kern_proc out routines that print to this sbuf may 1531 * call us with the process lock held. Draining with the 1532 * non-sleepable lock held is unsafe. The lock is needed for 1533 * those routines when dumping a live process. In our case we 1534 * can safely release the lock before draining and acquire 1535 * again after. 1536 */ 1537 locked = PROC_LOCKED(p->td->td_proc); 1538 if (locked) 1539 PROC_UNLOCK(p->td->td_proc); 1540 if (p->comp != NULL) 1541 error = compressor_write(p->comp, __DECONST(char *, data), len); 1542 else 1543 error = core_write(p, __DECONST(void *, data), len, p->offset, 1544 UIO_SYSSPACE); 1545 if (locked) 1546 PROC_LOCK(p->td->td_proc); 1547 if (error != 0) 1548 return (-error); 1549 p->offset += len; 1550 return (len); 1551 } 1552 1553 int 1554 __elfN(coredump)(struct thread *td, struct vnode *vp, off_t limit, int flags) 1555 { 1556 struct ucred *cred = td->td_ucred; 1557 int error = 0; 1558 struct sseg_closure seginfo; 1559 struct note_info_list notelst; 1560 struct coredump_params params; 1561 struct note_info *ninfo; 1562 void *hdr, *tmpbuf; 1563 size_t hdrsize, notesz, coresize; 1564 1565 hdr = NULL; 1566 tmpbuf = NULL; 1567 TAILQ_INIT(¬elst); 1568 1569 /* Size the program segments. */ 1570 seginfo.count = 0; 1571 seginfo.size = 0; 1572 each_dumpable_segment(td, cb_size_segment, &seginfo); 1573 1574 /* 1575 * Collect info about the core file header area. 1576 */ 1577 hdrsize = sizeof(Elf_Ehdr) + sizeof(Elf_Phdr) * (1 + seginfo.count); 1578 if (seginfo.count + 1 >= PN_XNUM) 1579 hdrsize += sizeof(Elf_Shdr); 1580 __elfN(prepare_notes)(td, ¬elst, ¬esz); 1581 coresize = round_page(hdrsize + notesz) + seginfo.size; 1582 1583 /* Set up core dump parameters. */ 1584 params.offset = 0; 1585 params.active_cred = cred; 1586 params.file_cred = NOCRED; 1587 params.td = td; 1588 params.vp = vp; 1589 params.comp = NULL; 1590 1591 #ifdef RACCT 1592 if (racct_enable) { 1593 PROC_LOCK(td->td_proc); 1594 error = racct_add(td->td_proc, RACCT_CORE, coresize); 1595 PROC_UNLOCK(td->td_proc); 1596 if (error != 0) { 1597 error = EFAULT; 1598 goto done; 1599 } 1600 } 1601 #endif 1602 if (coresize >= limit) { 1603 error = EFAULT; 1604 goto done; 1605 } 1606 1607 /* Create a compression stream if necessary. */ 1608 if (compress_user_cores != 0) { 1609 params.comp = compressor_init(core_compressed_write, 1610 compress_user_cores, CORE_BUF_SIZE, 1611 compress_user_cores_level, ¶ms); 1612 if (params.comp == NULL) { 1613 error = EFAULT; 1614 goto done; 1615 } 1616 tmpbuf = malloc(CORE_BUF_SIZE, M_TEMP, M_WAITOK | M_ZERO); 1617 } 1618 1619 /* 1620 * Allocate memory for building the header, fill it up, 1621 * and write it out following the notes. 1622 */ 1623 hdr = malloc(hdrsize, M_TEMP, M_WAITOK); 1624 error = __elfN(corehdr)(¶ms, seginfo.count, hdr, hdrsize, ¬elst, 1625 notesz); 1626 1627 /* Write the contents of all of the writable segments. */ 1628 if (error == 0) { 1629 Elf_Phdr *php; 1630 off_t offset; 1631 int i; 1632 1633 php = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr)) + 1; 1634 offset = round_page(hdrsize + notesz); 1635 for (i = 0; i < seginfo.count; i++) { 1636 error = core_output((caddr_t)(uintptr_t)php->p_vaddr, 1637 php->p_filesz, offset, ¶ms, tmpbuf); 1638 if (error != 0) 1639 break; 1640 offset += php->p_filesz; 1641 php++; 1642 } 1643 if (error == 0 && params.comp != NULL) 1644 error = compressor_flush(params.comp); 1645 } 1646 if (error) { 1647 log(LOG_WARNING, 1648 "Failed to write core file for process %s (error %d)\n", 1649 curproc->p_comm, error); 1650 } 1651 1652 done: 1653 free(tmpbuf, M_TEMP); 1654 if (params.comp != NULL) 1655 compressor_fini(params.comp); 1656 while ((ninfo = TAILQ_FIRST(¬elst)) != NULL) { 1657 TAILQ_REMOVE(¬elst, ninfo, link); 1658 free(ninfo, M_TEMP); 1659 } 1660 if (hdr != NULL) 1661 free(hdr, M_TEMP); 1662 1663 return (error); 1664 } 1665 1666 /* 1667 * A callback for each_dumpable_segment() to write out the segment's 1668 * program header entry. 1669 */ 1670 static void 1671 cb_put_phdr(vm_map_entry_t entry, void *closure) 1672 { 1673 struct phdr_closure *phc = (struct phdr_closure *)closure; 1674 Elf_Phdr *phdr = phc->phdr; 1675 1676 phc->offset = round_page(phc->offset); 1677 1678 phdr->p_type = PT_LOAD; 1679 phdr->p_offset = phc->offset; 1680 phdr->p_vaddr = entry->start; 1681 phdr->p_paddr = 0; 1682 phdr->p_filesz = phdr->p_memsz = entry->end - entry->start; 1683 phdr->p_align = PAGE_SIZE; 1684 phdr->p_flags = __elfN(untrans_prot)(entry->protection); 1685 1686 phc->offset += phdr->p_filesz; 1687 phc->phdr++; 1688 } 1689 1690 /* 1691 * A callback for each_dumpable_segment() to gather information about 1692 * the number of segments and their total size. 1693 */ 1694 static void 1695 cb_size_segment(vm_map_entry_t entry, void *closure) 1696 { 1697 struct sseg_closure *ssc = (struct sseg_closure *)closure; 1698 1699 ssc->count++; 1700 ssc->size += entry->end - entry->start; 1701 } 1702 1703 /* 1704 * For each writable segment in the process's memory map, call the given 1705 * function with a pointer to the map entry and some arbitrary 1706 * caller-supplied data. 1707 */ 1708 static void 1709 each_dumpable_segment(struct thread *td, segment_callback func, void *closure) 1710 { 1711 struct proc *p = td->td_proc; 1712 vm_map_t map = &p->p_vmspace->vm_map; 1713 vm_map_entry_t entry; 1714 vm_object_t backing_object, object; 1715 boolean_t ignore_entry; 1716 1717 vm_map_lock_read(map); 1718 for (entry = map->header.next; entry != &map->header; 1719 entry = entry->next) { 1720 /* 1721 * Don't dump inaccessible mappings, deal with legacy 1722 * coredump mode. 1723 * 1724 * Note that read-only segments related to the elf binary 1725 * are marked MAP_ENTRY_NOCOREDUMP now so we no longer 1726 * need to arbitrarily ignore such segments. 1727 */ 1728 if (elf_legacy_coredump) { 1729 if ((entry->protection & VM_PROT_RW) != VM_PROT_RW) 1730 continue; 1731 } else { 1732 if ((entry->protection & VM_PROT_ALL) == 0) 1733 continue; 1734 } 1735 1736 /* 1737 * Dont include memory segment in the coredump if 1738 * MAP_NOCORE is set in mmap(2) or MADV_NOCORE in 1739 * madvise(2). Do not dump submaps (i.e. parts of the 1740 * kernel map). 1741 */ 1742 if (entry->eflags & (MAP_ENTRY_NOCOREDUMP|MAP_ENTRY_IS_SUB_MAP)) 1743 continue; 1744 1745 if ((object = entry->object.vm_object) == NULL) 1746 continue; 1747 1748 /* Ignore memory-mapped devices and such things. */ 1749 VM_OBJECT_RLOCK(object); 1750 while ((backing_object = object->backing_object) != NULL) { 1751 VM_OBJECT_RLOCK(backing_object); 1752 VM_OBJECT_RUNLOCK(object); 1753 object = backing_object; 1754 } 1755 ignore_entry = object->type != OBJT_DEFAULT && 1756 object->type != OBJT_SWAP && object->type != OBJT_VNODE && 1757 object->type != OBJT_PHYS; 1758 VM_OBJECT_RUNLOCK(object); 1759 if (ignore_entry) 1760 continue; 1761 1762 (*func)(entry, closure); 1763 } 1764 vm_map_unlock_read(map); 1765 } 1766 1767 /* 1768 * Write the core file header to the file, including padding up to 1769 * the page boundary. 1770 */ 1771 static int 1772 __elfN(corehdr)(struct coredump_params *p, int numsegs, void *hdr, 1773 size_t hdrsize, struct note_info_list *notelst, size_t notesz) 1774 { 1775 struct note_info *ninfo; 1776 struct sbuf *sb; 1777 int error; 1778 1779 /* Fill in the header. */ 1780 bzero(hdr, hdrsize); 1781 __elfN(puthdr)(p->td, hdr, hdrsize, numsegs, notesz); 1782 1783 sb = sbuf_new(NULL, NULL, CORE_BUF_SIZE, SBUF_FIXEDLEN); 1784 sbuf_set_drain(sb, sbuf_drain_core_output, p); 1785 sbuf_start_section(sb, NULL); 1786 sbuf_bcat(sb, hdr, hdrsize); 1787 TAILQ_FOREACH(ninfo, notelst, link) 1788 __elfN(putnote)(ninfo, sb); 1789 /* Align up to a page boundary for the program segments. */ 1790 sbuf_end_section(sb, -1, PAGE_SIZE, 0); 1791 error = sbuf_finish(sb); 1792 sbuf_delete(sb); 1793 1794 return (error); 1795 } 1796 1797 static void 1798 __elfN(prepare_notes)(struct thread *td, struct note_info_list *list, 1799 size_t *sizep) 1800 { 1801 struct proc *p; 1802 struct thread *thr; 1803 size_t size; 1804 1805 p = td->td_proc; 1806 size = 0; 1807 1808 size += register_note(list, NT_PRPSINFO, __elfN(note_prpsinfo), p); 1809 1810 /* 1811 * To have the debugger select the right thread (LWP) as the initial 1812 * thread, we dump the state of the thread passed to us in td first. 1813 * This is the thread that causes the core dump and thus likely to 1814 * be the right thread one wants to have selected in the debugger. 1815 */ 1816 thr = td; 1817 while (thr != NULL) { 1818 size += register_note(list, NT_PRSTATUS, 1819 __elfN(note_prstatus), thr); 1820 size += register_note(list, NT_FPREGSET, 1821 __elfN(note_fpregset), thr); 1822 size += register_note(list, NT_THRMISC, 1823 __elfN(note_thrmisc), thr); 1824 size += register_note(list, NT_PTLWPINFO, 1825 __elfN(note_ptlwpinfo), thr); 1826 size += register_note(list, -1, 1827 __elfN(note_threadmd), thr); 1828 1829 thr = (thr == td) ? TAILQ_FIRST(&p->p_threads) : 1830 TAILQ_NEXT(thr, td_plist); 1831 if (thr == td) 1832 thr = TAILQ_NEXT(thr, td_plist); 1833 } 1834 1835 size += register_note(list, NT_PROCSTAT_PROC, 1836 __elfN(note_procstat_proc), p); 1837 size += register_note(list, NT_PROCSTAT_FILES, 1838 note_procstat_files, p); 1839 size += register_note(list, NT_PROCSTAT_VMMAP, 1840 note_procstat_vmmap, p); 1841 size += register_note(list, NT_PROCSTAT_GROUPS, 1842 note_procstat_groups, p); 1843 size += register_note(list, NT_PROCSTAT_UMASK, 1844 note_procstat_umask, p); 1845 size += register_note(list, NT_PROCSTAT_RLIMIT, 1846 note_procstat_rlimit, p); 1847 size += register_note(list, NT_PROCSTAT_OSREL, 1848 note_procstat_osrel, p); 1849 size += register_note(list, NT_PROCSTAT_PSSTRINGS, 1850 __elfN(note_procstat_psstrings), p); 1851 size += register_note(list, NT_PROCSTAT_AUXV, 1852 __elfN(note_procstat_auxv), p); 1853 1854 *sizep = size; 1855 } 1856 1857 static void 1858 __elfN(puthdr)(struct thread *td, void *hdr, size_t hdrsize, int numsegs, 1859 size_t notesz) 1860 { 1861 Elf_Ehdr *ehdr; 1862 Elf_Phdr *phdr; 1863 Elf_Shdr *shdr; 1864 struct phdr_closure phc; 1865 1866 ehdr = (Elf_Ehdr *)hdr; 1867 1868 ehdr->e_ident[EI_MAG0] = ELFMAG0; 1869 ehdr->e_ident[EI_MAG1] = ELFMAG1; 1870 ehdr->e_ident[EI_MAG2] = ELFMAG2; 1871 ehdr->e_ident[EI_MAG3] = ELFMAG3; 1872 ehdr->e_ident[EI_CLASS] = ELF_CLASS; 1873 ehdr->e_ident[EI_DATA] = ELF_DATA; 1874 ehdr->e_ident[EI_VERSION] = EV_CURRENT; 1875 ehdr->e_ident[EI_OSABI] = ELFOSABI_FREEBSD; 1876 ehdr->e_ident[EI_ABIVERSION] = 0; 1877 ehdr->e_ident[EI_PAD] = 0; 1878 ehdr->e_type = ET_CORE; 1879 ehdr->e_machine = td->td_proc->p_elf_machine; 1880 ehdr->e_version = EV_CURRENT; 1881 ehdr->e_entry = 0; 1882 ehdr->e_phoff = sizeof(Elf_Ehdr); 1883 ehdr->e_flags = td->td_proc->p_elf_flags; 1884 ehdr->e_ehsize = sizeof(Elf_Ehdr); 1885 ehdr->e_phentsize = sizeof(Elf_Phdr); 1886 ehdr->e_shentsize = sizeof(Elf_Shdr); 1887 ehdr->e_shstrndx = SHN_UNDEF; 1888 if (numsegs + 1 < PN_XNUM) { 1889 ehdr->e_phnum = numsegs + 1; 1890 ehdr->e_shnum = 0; 1891 } else { 1892 ehdr->e_phnum = PN_XNUM; 1893 ehdr->e_shnum = 1; 1894 1895 ehdr->e_shoff = ehdr->e_phoff + 1896 (numsegs + 1) * ehdr->e_phentsize; 1897 KASSERT(ehdr->e_shoff == hdrsize - sizeof(Elf_Shdr), 1898 ("e_shoff: %zu, hdrsize - shdr: %zu", 1899 (size_t)ehdr->e_shoff, hdrsize - sizeof(Elf_Shdr))); 1900 1901 shdr = (Elf_Shdr *)((char *)hdr + ehdr->e_shoff); 1902 memset(shdr, 0, sizeof(*shdr)); 1903 /* 1904 * A special first section is used to hold large segment and 1905 * section counts. This was proposed by Sun Microsystems in 1906 * Solaris and has been adopted by Linux; the standard ELF 1907 * tools are already familiar with the technique. 1908 * 1909 * See table 7-7 of the Solaris "Linker and Libraries Guide" 1910 * (or 12-7 depending on the version of the document) for more 1911 * details. 1912 */ 1913 shdr->sh_type = SHT_NULL; 1914 shdr->sh_size = ehdr->e_shnum; 1915 shdr->sh_link = ehdr->e_shstrndx; 1916 shdr->sh_info = numsegs + 1; 1917 } 1918 1919 /* 1920 * Fill in the program header entries. 1921 */ 1922 phdr = (Elf_Phdr *)((char *)hdr + ehdr->e_phoff); 1923 1924 /* The note segement. */ 1925 phdr->p_type = PT_NOTE; 1926 phdr->p_offset = hdrsize; 1927 phdr->p_vaddr = 0; 1928 phdr->p_paddr = 0; 1929 phdr->p_filesz = notesz; 1930 phdr->p_memsz = 0; 1931 phdr->p_flags = PF_R; 1932 phdr->p_align = ELF_NOTE_ROUNDSIZE; 1933 phdr++; 1934 1935 /* All the writable segments from the program. */ 1936 phc.phdr = phdr; 1937 phc.offset = round_page(hdrsize + notesz); 1938 each_dumpable_segment(td, cb_put_phdr, &phc); 1939 } 1940 1941 static size_t 1942 register_note(struct note_info_list *list, int type, outfunc_t out, void *arg) 1943 { 1944 struct note_info *ninfo; 1945 size_t size, notesize; 1946 1947 size = 0; 1948 out(arg, NULL, &size); 1949 ninfo = malloc(sizeof(*ninfo), M_TEMP, M_ZERO | M_WAITOK); 1950 ninfo->type = type; 1951 ninfo->outfunc = out; 1952 ninfo->outarg = arg; 1953 ninfo->outsize = size; 1954 TAILQ_INSERT_TAIL(list, ninfo, link); 1955 1956 if (type == -1) 1957 return (size); 1958 1959 notesize = sizeof(Elf_Note) + /* note header */ 1960 roundup2(sizeof(FREEBSD_ABI_VENDOR), ELF_NOTE_ROUNDSIZE) + 1961 /* note name */ 1962 roundup2(size, ELF_NOTE_ROUNDSIZE); /* note description */ 1963 1964 return (notesize); 1965 } 1966 1967 static size_t 1968 append_note_data(const void *src, void *dst, size_t len) 1969 { 1970 size_t padded_len; 1971 1972 padded_len = roundup2(len, ELF_NOTE_ROUNDSIZE); 1973 if (dst != NULL) { 1974 bcopy(src, dst, len); 1975 bzero((char *)dst + len, padded_len - len); 1976 } 1977 return (padded_len); 1978 } 1979 1980 size_t 1981 __elfN(populate_note)(int type, void *src, void *dst, size_t size, void **descp) 1982 { 1983 Elf_Note *note; 1984 char *buf; 1985 size_t notesize; 1986 1987 buf = dst; 1988 if (buf != NULL) { 1989 note = (Elf_Note *)buf; 1990 note->n_namesz = sizeof(FREEBSD_ABI_VENDOR); 1991 note->n_descsz = size; 1992 note->n_type = type; 1993 buf += sizeof(*note); 1994 buf += append_note_data(FREEBSD_ABI_VENDOR, buf, 1995 sizeof(FREEBSD_ABI_VENDOR)); 1996 append_note_data(src, buf, size); 1997 if (descp != NULL) 1998 *descp = buf; 1999 } 2000 2001 notesize = sizeof(Elf_Note) + /* note header */ 2002 roundup2(sizeof(FREEBSD_ABI_VENDOR), ELF_NOTE_ROUNDSIZE) + 2003 /* note name */ 2004 roundup2(size, ELF_NOTE_ROUNDSIZE); /* note description */ 2005 2006 return (notesize); 2007 } 2008 2009 static void 2010 __elfN(putnote)(struct note_info *ninfo, struct sbuf *sb) 2011 { 2012 Elf_Note note; 2013 ssize_t old_len, sect_len; 2014 size_t new_len, descsz, i; 2015 2016 if (ninfo->type == -1) { 2017 ninfo->outfunc(ninfo->outarg, sb, &ninfo->outsize); 2018 return; 2019 } 2020 2021 note.n_namesz = sizeof(FREEBSD_ABI_VENDOR); 2022 note.n_descsz = ninfo->outsize; 2023 note.n_type = ninfo->type; 2024 2025 sbuf_bcat(sb, ¬e, sizeof(note)); 2026 sbuf_start_section(sb, &old_len); 2027 sbuf_bcat(sb, FREEBSD_ABI_VENDOR, sizeof(FREEBSD_ABI_VENDOR)); 2028 sbuf_end_section(sb, old_len, ELF_NOTE_ROUNDSIZE, 0); 2029 if (note.n_descsz == 0) 2030 return; 2031 sbuf_start_section(sb, &old_len); 2032 ninfo->outfunc(ninfo->outarg, sb, &ninfo->outsize); 2033 sect_len = sbuf_end_section(sb, old_len, ELF_NOTE_ROUNDSIZE, 0); 2034 if (sect_len < 0) 2035 return; 2036 2037 new_len = (size_t)sect_len; 2038 descsz = roundup(note.n_descsz, ELF_NOTE_ROUNDSIZE); 2039 if (new_len < descsz) { 2040 /* 2041 * It is expected that individual note emitters will correctly 2042 * predict their expected output size and fill up to that size 2043 * themselves, padding in a format-specific way if needed. 2044 * However, in case they don't, just do it here with zeros. 2045 */ 2046 for (i = 0; i < descsz - new_len; i++) 2047 sbuf_putc(sb, 0); 2048 } else if (new_len > descsz) { 2049 /* 2050 * We can't always truncate sb -- we may have drained some 2051 * of it already. 2052 */ 2053 KASSERT(new_len == descsz, ("%s: Note type %u changed as we " 2054 "read it (%zu > %zu). Since it is longer than " 2055 "expected, this coredump's notes are corrupt. THIS " 2056 "IS A BUG in the note_procstat routine for type %u.\n", 2057 __func__, (unsigned)note.n_type, new_len, descsz, 2058 (unsigned)note.n_type)); 2059 } 2060 } 2061 2062 /* 2063 * Miscellaneous note out functions. 2064 */ 2065 2066 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 2067 #include <compat/freebsd32/freebsd32.h> 2068 #include <compat/freebsd32/freebsd32_signal.h> 2069 2070 typedef struct prstatus32 elf_prstatus_t; 2071 typedef struct prpsinfo32 elf_prpsinfo_t; 2072 typedef struct fpreg32 elf_prfpregset_t; 2073 typedef struct fpreg32 elf_fpregset_t; 2074 typedef struct reg32 elf_gregset_t; 2075 typedef struct thrmisc32 elf_thrmisc_t; 2076 #define ELF_KERN_PROC_MASK KERN_PROC_MASK32 2077 typedef struct kinfo_proc32 elf_kinfo_proc_t; 2078 typedef uint32_t elf_ps_strings_t; 2079 #else 2080 typedef prstatus_t elf_prstatus_t; 2081 typedef prpsinfo_t elf_prpsinfo_t; 2082 typedef prfpregset_t elf_prfpregset_t; 2083 typedef prfpregset_t elf_fpregset_t; 2084 typedef gregset_t elf_gregset_t; 2085 typedef thrmisc_t elf_thrmisc_t; 2086 #define ELF_KERN_PROC_MASK 0 2087 typedef struct kinfo_proc elf_kinfo_proc_t; 2088 typedef vm_offset_t elf_ps_strings_t; 2089 #endif 2090 2091 static void 2092 __elfN(note_prpsinfo)(void *arg, struct sbuf *sb, size_t *sizep) 2093 { 2094 struct sbuf sbarg; 2095 size_t len; 2096 char *cp, *end; 2097 struct proc *p; 2098 elf_prpsinfo_t *psinfo; 2099 int error; 2100 2101 p = (struct proc *)arg; 2102 if (sb != NULL) { 2103 KASSERT(*sizep == sizeof(*psinfo), ("invalid size")); 2104 psinfo = malloc(sizeof(*psinfo), M_TEMP, M_ZERO | M_WAITOK); 2105 psinfo->pr_version = PRPSINFO_VERSION; 2106 psinfo->pr_psinfosz = sizeof(elf_prpsinfo_t); 2107 strlcpy(psinfo->pr_fname, p->p_comm, sizeof(psinfo->pr_fname)); 2108 PROC_LOCK(p); 2109 if (p->p_args != NULL) { 2110 len = sizeof(psinfo->pr_psargs) - 1; 2111 if (len > p->p_args->ar_length) 2112 len = p->p_args->ar_length; 2113 memcpy(psinfo->pr_psargs, p->p_args->ar_args, len); 2114 PROC_UNLOCK(p); 2115 error = 0; 2116 } else { 2117 _PHOLD(p); 2118 PROC_UNLOCK(p); 2119 sbuf_new(&sbarg, psinfo->pr_psargs, 2120 sizeof(psinfo->pr_psargs), SBUF_FIXEDLEN); 2121 error = proc_getargv(curthread, p, &sbarg); 2122 PRELE(p); 2123 if (sbuf_finish(&sbarg) == 0) 2124 len = sbuf_len(&sbarg) - 1; 2125 else 2126 len = sizeof(psinfo->pr_psargs) - 1; 2127 sbuf_delete(&sbarg); 2128 } 2129 if (error || len == 0) 2130 strlcpy(psinfo->pr_psargs, p->p_comm, 2131 sizeof(psinfo->pr_psargs)); 2132 else { 2133 KASSERT(len < sizeof(psinfo->pr_psargs), 2134 ("len is too long: %zu vs %zu", len, 2135 sizeof(psinfo->pr_psargs))); 2136 cp = psinfo->pr_psargs; 2137 end = cp + len - 1; 2138 for (;;) { 2139 cp = memchr(cp, '\0', end - cp); 2140 if (cp == NULL) 2141 break; 2142 *cp = ' '; 2143 } 2144 } 2145 psinfo->pr_pid = p->p_pid; 2146 sbuf_bcat(sb, psinfo, sizeof(*psinfo)); 2147 free(psinfo, M_TEMP); 2148 } 2149 *sizep = sizeof(*psinfo); 2150 } 2151 2152 static void 2153 __elfN(note_prstatus)(void *arg, struct sbuf *sb, size_t *sizep) 2154 { 2155 struct thread *td; 2156 elf_prstatus_t *status; 2157 2158 td = (struct thread *)arg; 2159 if (sb != NULL) { 2160 KASSERT(*sizep == sizeof(*status), ("invalid size")); 2161 status = malloc(sizeof(*status), M_TEMP, M_ZERO | M_WAITOK); 2162 status->pr_version = PRSTATUS_VERSION; 2163 status->pr_statussz = sizeof(elf_prstatus_t); 2164 status->pr_gregsetsz = sizeof(elf_gregset_t); 2165 status->pr_fpregsetsz = sizeof(elf_fpregset_t); 2166 status->pr_osreldate = osreldate; 2167 status->pr_cursig = td->td_proc->p_sig; 2168 status->pr_pid = td->td_tid; 2169 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 2170 fill_regs32(td, &status->pr_reg); 2171 #else 2172 fill_regs(td, &status->pr_reg); 2173 #endif 2174 sbuf_bcat(sb, status, sizeof(*status)); 2175 free(status, M_TEMP); 2176 } 2177 *sizep = sizeof(*status); 2178 } 2179 2180 static void 2181 __elfN(note_fpregset)(void *arg, struct sbuf *sb, size_t *sizep) 2182 { 2183 struct thread *td; 2184 elf_prfpregset_t *fpregset; 2185 2186 td = (struct thread *)arg; 2187 if (sb != NULL) { 2188 KASSERT(*sizep == sizeof(*fpregset), ("invalid size")); 2189 fpregset = malloc(sizeof(*fpregset), M_TEMP, M_ZERO | M_WAITOK); 2190 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 2191 fill_fpregs32(td, fpregset); 2192 #else 2193 fill_fpregs(td, fpregset); 2194 #endif 2195 sbuf_bcat(sb, fpregset, sizeof(*fpregset)); 2196 free(fpregset, M_TEMP); 2197 } 2198 *sizep = sizeof(*fpregset); 2199 } 2200 2201 static void 2202 __elfN(note_thrmisc)(void *arg, struct sbuf *sb, size_t *sizep) 2203 { 2204 struct thread *td; 2205 elf_thrmisc_t thrmisc; 2206 2207 td = (struct thread *)arg; 2208 if (sb != NULL) { 2209 KASSERT(*sizep == sizeof(thrmisc), ("invalid size")); 2210 bzero(&thrmisc._pad, sizeof(thrmisc._pad)); 2211 strcpy(thrmisc.pr_tname, td->td_name); 2212 sbuf_bcat(sb, &thrmisc, sizeof(thrmisc)); 2213 } 2214 *sizep = sizeof(thrmisc); 2215 } 2216 2217 static void 2218 __elfN(note_ptlwpinfo)(void *arg, struct sbuf *sb, size_t *sizep) 2219 { 2220 struct thread *td; 2221 size_t size; 2222 int structsize; 2223 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 2224 struct ptrace_lwpinfo32 pl; 2225 #else 2226 struct ptrace_lwpinfo pl; 2227 #endif 2228 2229 td = (struct thread *)arg; 2230 size = sizeof(structsize) + sizeof(pl); 2231 if (sb != NULL) { 2232 KASSERT(*sizep == size, ("invalid size")); 2233 structsize = sizeof(pl); 2234 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2235 bzero(&pl, sizeof(pl)); 2236 pl.pl_lwpid = td->td_tid; 2237 pl.pl_event = PL_EVENT_NONE; 2238 pl.pl_sigmask = td->td_sigmask; 2239 pl.pl_siglist = td->td_siglist; 2240 if (td->td_si.si_signo != 0) { 2241 pl.pl_event = PL_EVENT_SIGNAL; 2242 pl.pl_flags |= PL_FLAG_SI; 2243 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 2244 siginfo_to_siginfo32(&td->td_si, &pl.pl_siginfo); 2245 #else 2246 pl.pl_siginfo = td->td_si; 2247 #endif 2248 } 2249 strcpy(pl.pl_tdname, td->td_name); 2250 /* XXX TODO: supply more information in struct ptrace_lwpinfo*/ 2251 sbuf_bcat(sb, &pl, sizeof(pl)); 2252 } 2253 *sizep = size; 2254 } 2255 2256 /* 2257 * Allow for MD specific notes, as well as any MD 2258 * specific preparations for writing MI notes. 2259 */ 2260 static void 2261 __elfN(note_threadmd)(void *arg, struct sbuf *sb, size_t *sizep) 2262 { 2263 struct thread *td; 2264 void *buf; 2265 size_t size; 2266 2267 td = (struct thread *)arg; 2268 size = *sizep; 2269 if (size != 0 && sb != NULL) 2270 buf = malloc(size, M_TEMP, M_ZERO | M_WAITOK); 2271 else 2272 buf = NULL; 2273 size = 0; 2274 __elfN(dump_thread)(td, buf, &size); 2275 KASSERT(sb == NULL || *sizep == size, ("invalid size")); 2276 if (size != 0 && sb != NULL) 2277 sbuf_bcat(sb, buf, size); 2278 free(buf, M_TEMP); 2279 *sizep = size; 2280 } 2281 2282 #ifdef KINFO_PROC_SIZE 2283 CTASSERT(sizeof(struct kinfo_proc) == KINFO_PROC_SIZE); 2284 #endif 2285 2286 static void 2287 __elfN(note_procstat_proc)(void *arg, struct sbuf *sb, size_t *sizep) 2288 { 2289 struct proc *p; 2290 size_t size; 2291 int structsize; 2292 2293 p = (struct proc *)arg; 2294 size = sizeof(structsize) + p->p_numthreads * 2295 sizeof(elf_kinfo_proc_t); 2296 2297 if (sb != NULL) { 2298 KASSERT(*sizep == size, ("invalid size")); 2299 structsize = sizeof(elf_kinfo_proc_t); 2300 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2301 PROC_LOCK(p); 2302 kern_proc_out(p, sb, ELF_KERN_PROC_MASK); 2303 } 2304 *sizep = size; 2305 } 2306 2307 #ifdef KINFO_FILE_SIZE 2308 CTASSERT(sizeof(struct kinfo_file) == KINFO_FILE_SIZE); 2309 #endif 2310 2311 static void 2312 note_procstat_files(void *arg, struct sbuf *sb, size_t *sizep) 2313 { 2314 struct proc *p; 2315 size_t size, sect_sz, i; 2316 ssize_t start_len, sect_len; 2317 int structsize, filedesc_flags; 2318 2319 if (coredump_pack_fileinfo) 2320 filedesc_flags = KERN_FILEDESC_PACK_KINFO; 2321 else 2322 filedesc_flags = 0; 2323 2324 p = (struct proc *)arg; 2325 structsize = sizeof(struct kinfo_file); 2326 if (sb == NULL) { 2327 size = 0; 2328 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN); 2329 sbuf_set_drain(sb, sbuf_count_drain, &size); 2330 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2331 PROC_LOCK(p); 2332 kern_proc_filedesc_out(p, sb, -1, filedesc_flags); 2333 sbuf_finish(sb); 2334 sbuf_delete(sb); 2335 *sizep = size; 2336 } else { 2337 sbuf_start_section(sb, &start_len); 2338 2339 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2340 PROC_LOCK(p); 2341 kern_proc_filedesc_out(p, sb, *sizep - sizeof(structsize), 2342 filedesc_flags); 2343 2344 sect_len = sbuf_end_section(sb, start_len, 0, 0); 2345 if (sect_len < 0) 2346 return; 2347 sect_sz = sect_len; 2348 2349 KASSERT(sect_sz <= *sizep, 2350 ("kern_proc_filedesc_out did not respect maxlen; " 2351 "requested %zu, got %zu", *sizep - sizeof(structsize), 2352 sect_sz - sizeof(structsize))); 2353 2354 for (i = 0; i < *sizep - sect_sz && sb->s_error == 0; i++) 2355 sbuf_putc(sb, 0); 2356 } 2357 } 2358 2359 #ifdef KINFO_VMENTRY_SIZE 2360 CTASSERT(sizeof(struct kinfo_vmentry) == KINFO_VMENTRY_SIZE); 2361 #endif 2362 2363 static void 2364 note_procstat_vmmap(void *arg, struct sbuf *sb, size_t *sizep) 2365 { 2366 struct proc *p; 2367 size_t size; 2368 int structsize, vmmap_flags; 2369 2370 if (coredump_pack_vmmapinfo) 2371 vmmap_flags = KERN_VMMAP_PACK_KINFO; 2372 else 2373 vmmap_flags = 0; 2374 2375 p = (struct proc *)arg; 2376 structsize = sizeof(struct kinfo_vmentry); 2377 if (sb == NULL) { 2378 size = 0; 2379 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN); 2380 sbuf_set_drain(sb, sbuf_count_drain, &size); 2381 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2382 PROC_LOCK(p); 2383 kern_proc_vmmap_out(p, sb, -1, vmmap_flags); 2384 sbuf_finish(sb); 2385 sbuf_delete(sb); 2386 *sizep = size; 2387 } else { 2388 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2389 PROC_LOCK(p); 2390 kern_proc_vmmap_out(p, sb, *sizep - sizeof(structsize), 2391 vmmap_flags); 2392 } 2393 } 2394 2395 static void 2396 note_procstat_groups(void *arg, struct sbuf *sb, size_t *sizep) 2397 { 2398 struct proc *p; 2399 size_t size; 2400 int structsize; 2401 2402 p = (struct proc *)arg; 2403 size = sizeof(structsize) + p->p_ucred->cr_ngroups * sizeof(gid_t); 2404 if (sb != NULL) { 2405 KASSERT(*sizep == size, ("invalid size")); 2406 structsize = sizeof(gid_t); 2407 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2408 sbuf_bcat(sb, p->p_ucred->cr_groups, p->p_ucred->cr_ngroups * 2409 sizeof(gid_t)); 2410 } 2411 *sizep = size; 2412 } 2413 2414 static void 2415 note_procstat_umask(void *arg, struct sbuf *sb, size_t *sizep) 2416 { 2417 struct proc *p; 2418 size_t size; 2419 int structsize; 2420 2421 p = (struct proc *)arg; 2422 size = sizeof(structsize) + sizeof(p->p_fd->fd_cmask); 2423 if (sb != NULL) { 2424 KASSERT(*sizep == size, ("invalid size")); 2425 structsize = sizeof(p->p_fd->fd_cmask); 2426 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2427 sbuf_bcat(sb, &p->p_fd->fd_cmask, sizeof(p->p_fd->fd_cmask)); 2428 } 2429 *sizep = size; 2430 } 2431 2432 static void 2433 note_procstat_rlimit(void *arg, struct sbuf *sb, size_t *sizep) 2434 { 2435 struct proc *p; 2436 struct rlimit rlim[RLIM_NLIMITS]; 2437 size_t size; 2438 int structsize, i; 2439 2440 p = (struct proc *)arg; 2441 size = sizeof(structsize) + sizeof(rlim); 2442 if (sb != NULL) { 2443 KASSERT(*sizep == size, ("invalid size")); 2444 structsize = sizeof(rlim); 2445 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2446 PROC_LOCK(p); 2447 for (i = 0; i < RLIM_NLIMITS; i++) 2448 lim_rlimit_proc(p, i, &rlim[i]); 2449 PROC_UNLOCK(p); 2450 sbuf_bcat(sb, rlim, sizeof(rlim)); 2451 } 2452 *sizep = size; 2453 } 2454 2455 static void 2456 note_procstat_osrel(void *arg, struct sbuf *sb, size_t *sizep) 2457 { 2458 struct proc *p; 2459 size_t size; 2460 int structsize; 2461 2462 p = (struct proc *)arg; 2463 size = sizeof(structsize) + sizeof(p->p_osrel); 2464 if (sb != NULL) { 2465 KASSERT(*sizep == size, ("invalid size")); 2466 structsize = sizeof(p->p_osrel); 2467 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2468 sbuf_bcat(sb, &p->p_osrel, sizeof(p->p_osrel)); 2469 } 2470 *sizep = size; 2471 } 2472 2473 static void 2474 __elfN(note_procstat_psstrings)(void *arg, struct sbuf *sb, size_t *sizep) 2475 { 2476 struct proc *p; 2477 elf_ps_strings_t ps_strings; 2478 size_t size; 2479 int structsize; 2480 2481 p = (struct proc *)arg; 2482 size = sizeof(structsize) + sizeof(ps_strings); 2483 if (sb != NULL) { 2484 KASSERT(*sizep == size, ("invalid size")); 2485 structsize = sizeof(ps_strings); 2486 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 2487 ps_strings = PTROUT(p->p_sysent->sv_psstrings); 2488 #else 2489 ps_strings = p->p_sysent->sv_psstrings; 2490 #endif 2491 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2492 sbuf_bcat(sb, &ps_strings, sizeof(ps_strings)); 2493 } 2494 *sizep = size; 2495 } 2496 2497 static void 2498 __elfN(note_procstat_auxv)(void *arg, struct sbuf *sb, size_t *sizep) 2499 { 2500 struct proc *p; 2501 size_t size; 2502 int structsize; 2503 2504 p = (struct proc *)arg; 2505 if (sb == NULL) { 2506 size = 0; 2507 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN); 2508 sbuf_set_drain(sb, sbuf_count_drain, &size); 2509 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2510 PHOLD(p); 2511 proc_getauxv(curthread, p, sb); 2512 PRELE(p); 2513 sbuf_finish(sb); 2514 sbuf_delete(sb); 2515 *sizep = size; 2516 } else { 2517 structsize = sizeof(Elf_Auxinfo); 2518 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2519 PHOLD(p); 2520 proc_getauxv(curthread, p, sb); 2521 PRELE(p); 2522 } 2523 } 2524 2525 static boolean_t 2526 __elfN(parse_notes)(struct image_params *imgp, Elf_Note *checknote, 2527 const char *note_vendor, const Elf_Phdr *pnote, 2528 boolean_t (*cb)(const Elf_Note *, void *, boolean_t *), void *cb_arg) 2529 { 2530 const Elf_Note *note, *note0, *note_end; 2531 const char *note_name; 2532 char *buf; 2533 int i, error; 2534 boolean_t res; 2535 2536 /* We need some limit, might as well use PAGE_SIZE. */ 2537 if (pnote == NULL || pnote->p_filesz > PAGE_SIZE) 2538 return (FALSE); 2539 ASSERT_VOP_LOCKED(imgp->vp, "parse_notes"); 2540 if (pnote->p_offset > PAGE_SIZE || 2541 pnote->p_filesz > PAGE_SIZE - pnote->p_offset) { 2542 buf = malloc(pnote->p_filesz, M_TEMP, M_NOWAIT); 2543 if (buf == NULL) { 2544 VOP_UNLOCK(imgp->vp, 0); 2545 buf = malloc(pnote->p_filesz, M_TEMP, M_WAITOK); 2546 vn_lock(imgp->vp, LK_SHARED | LK_RETRY); 2547 } 2548 error = vn_rdwr(UIO_READ, imgp->vp, buf, pnote->p_filesz, 2549 pnote->p_offset, UIO_SYSSPACE, IO_NODELOCKED, 2550 curthread->td_ucred, NOCRED, NULL, curthread); 2551 if (error != 0) { 2552 uprintf("i/o error PT_NOTE\n"); 2553 goto retf; 2554 } 2555 note = note0 = (const Elf_Note *)buf; 2556 note_end = (const Elf_Note *)(buf + pnote->p_filesz); 2557 } else { 2558 note = note0 = (const Elf_Note *)(imgp->image_header + 2559 pnote->p_offset); 2560 note_end = (const Elf_Note *)(imgp->image_header + 2561 pnote->p_offset + pnote->p_filesz); 2562 buf = NULL; 2563 } 2564 for (i = 0; i < 100 && note >= note0 && note < note_end; i++) { 2565 if (!aligned(note, Elf32_Addr) || (const char *)note_end - 2566 (const char *)note < sizeof(Elf_Note)) { 2567 goto retf; 2568 } 2569 if (note->n_namesz != checknote->n_namesz || 2570 note->n_descsz != checknote->n_descsz || 2571 note->n_type != checknote->n_type) 2572 goto nextnote; 2573 note_name = (const char *)(note + 1); 2574 if (note_name + checknote->n_namesz >= 2575 (const char *)note_end || strncmp(note_vendor, 2576 note_name, checknote->n_namesz) != 0) 2577 goto nextnote; 2578 2579 if (cb(note, cb_arg, &res)) 2580 goto ret; 2581 nextnote: 2582 note = (const Elf_Note *)((const char *)(note + 1) + 2583 roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE) + 2584 roundup2(note->n_descsz, ELF_NOTE_ROUNDSIZE)); 2585 } 2586 retf: 2587 res = FALSE; 2588 ret: 2589 free(buf, M_TEMP); 2590 return (res); 2591 } 2592 2593 struct brandnote_cb_arg { 2594 Elf_Brandnote *brandnote; 2595 int32_t *osrel; 2596 }; 2597 2598 static boolean_t 2599 brandnote_cb(const Elf_Note *note, void *arg0, boolean_t *res) 2600 { 2601 struct brandnote_cb_arg *arg; 2602 2603 arg = arg0; 2604 2605 /* 2606 * Fetch the osreldate for binary from the ELF OSABI-note if 2607 * necessary. 2608 */ 2609 *res = (arg->brandnote->flags & BN_TRANSLATE_OSREL) != 0 && 2610 arg->brandnote->trans_osrel != NULL ? 2611 arg->brandnote->trans_osrel(note, arg->osrel) : TRUE; 2612 2613 return (TRUE); 2614 } 2615 2616 static Elf_Note fctl_note = { 2617 .n_namesz = sizeof(FREEBSD_ABI_VENDOR), 2618 .n_descsz = sizeof(uint32_t), 2619 .n_type = NT_FREEBSD_FEATURE_CTL, 2620 }; 2621 2622 struct fctl_cb_arg { 2623 uint32_t *fctl0; 2624 }; 2625 2626 static boolean_t 2627 note_fctl_cb(const Elf_Note *note, void *arg0, boolean_t *res) 2628 { 2629 struct fctl_cb_arg *arg; 2630 const Elf32_Word *desc; 2631 uintptr_t p; 2632 2633 arg = arg0; 2634 p = (uintptr_t)(note + 1); 2635 p += roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE); 2636 desc = (const Elf32_Word *)p; 2637 *arg->fctl0 = desc[0]; 2638 return (TRUE); 2639 } 2640 2641 /* 2642 * Try to find the appropriate ABI-note section for checknote, fetch 2643 * the osreldate and feature control flags for binary from the ELF 2644 * OSABI-note. Only the first page of the image is searched, the same 2645 * as for headers. 2646 */ 2647 static boolean_t 2648 __elfN(check_note)(struct image_params *imgp, Elf_Brandnote *brandnote, 2649 int32_t *osrel, uint32_t *fctl0) 2650 { 2651 const Elf_Phdr *phdr; 2652 const Elf_Ehdr *hdr; 2653 struct brandnote_cb_arg b_arg; 2654 struct fctl_cb_arg f_arg; 2655 int i, j; 2656 2657 hdr = (const Elf_Ehdr *)imgp->image_header; 2658 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 2659 b_arg.brandnote = brandnote; 2660 b_arg.osrel = osrel; 2661 f_arg.fctl0 = fctl0; 2662 2663 for (i = 0; i < hdr->e_phnum; i++) { 2664 if (phdr[i].p_type == PT_NOTE && __elfN(parse_notes)(imgp, 2665 &brandnote->hdr, brandnote->vendor, &phdr[i], brandnote_cb, 2666 &b_arg)) { 2667 for (j = 0; j < hdr->e_phnum; j++) { 2668 if (phdr[j].p_type == PT_NOTE && 2669 __elfN(parse_notes)(imgp, &fctl_note, 2670 FREEBSD_ABI_VENDOR, &phdr[j], 2671 note_fctl_cb, &f_arg)) 2672 break; 2673 } 2674 return (TRUE); 2675 } 2676 } 2677 return (FALSE); 2678 2679 } 2680 2681 /* 2682 * Tell kern_execve.c about it, with a little help from the linker. 2683 */ 2684 static struct execsw __elfN(execsw) = { 2685 .ex_imgact = __CONCAT(exec_, __elfN(imgact)), 2686 .ex_name = __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) 2687 }; 2688 EXEC_SET(__CONCAT(elf, __ELF_WORD_SIZE), __elfN(execsw)); 2689 2690 static vm_prot_t 2691 __elfN(trans_prot)(Elf_Word flags) 2692 { 2693 vm_prot_t prot; 2694 2695 prot = 0; 2696 if (flags & PF_X) 2697 prot |= VM_PROT_EXECUTE; 2698 if (flags & PF_W) 2699 prot |= VM_PROT_WRITE; 2700 if (flags & PF_R) 2701 prot |= VM_PROT_READ; 2702 #if __ELF_WORD_SIZE == 32 && (defined(__amd64__) || defined(__i386__)) 2703 if (i386_read_exec && (flags & PF_R)) 2704 prot |= VM_PROT_EXECUTE; 2705 #endif 2706 return (prot); 2707 } 2708 2709 static Elf_Word 2710 __elfN(untrans_prot)(vm_prot_t prot) 2711 { 2712 Elf_Word flags; 2713 2714 flags = 0; 2715 if (prot & VM_PROT_EXECUTE) 2716 flags |= PF_X; 2717 if (prot & VM_PROT_READ) 2718 flags |= PF_R; 2719 if (prot & VM_PROT_WRITE) 2720 flags |= PF_W; 2721 return (flags); 2722 } 2723