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/proc.h> 54 #include <sys/procfs.h> 55 #include <sys/ptrace.h> 56 #include <sys/racct.h> 57 #include <sys/reg.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 bool __elfN(check_note)(struct image_params *imgp, 101 Elf_Brandnote *checknote, int32_t *osrel, bool *has_fctl0, 102 uint32_t *fctl0); 103 static vm_prot_t __elfN(trans_prot)(Elf_Word); 104 static Elf_Word __elfN(untrans_prot)(vm_prot_t); 105 106 SYSCTL_NODE(_kern, OID_AUTO, __CONCAT(elf, __ELF_WORD_SIZE), 107 CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 108 ""); 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 defined(__amd64__) 133 static int __elfN(vdso) = 1; 134 SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO, 135 vdso, CTLFLAG_RWTUN, &__elfN(vdso), 0, 136 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) ": enable vdso preloading"); 137 #else 138 static int __elfN(vdso) = 0; 139 #endif 140 141 #if __ELF_WORD_SIZE == 32 && (defined(__amd64__) || defined(__i386__)) 142 int i386_read_exec = 0; 143 SYSCTL_INT(_kern_elf32, OID_AUTO, read_exec, CTLFLAG_RW, &i386_read_exec, 0, 144 "enable execution from readable segments"); 145 #endif 146 147 static u_long __elfN(pie_base) = ET_DYN_LOAD_ADDR; 148 static int 149 sysctl_pie_base(SYSCTL_HANDLER_ARGS) 150 { 151 u_long val; 152 int error; 153 154 val = __elfN(pie_base); 155 error = sysctl_handle_long(oidp, &val, 0, req); 156 if (error != 0 || req->newptr == NULL) 157 return (error); 158 if ((val & PAGE_MASK) != 0) 159 return (EINVAL); 160 __elfN(pie_base) = val; 161 return (0); 162 } 163 SYSCTL_PROC(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO, pie_base, 164 CTLTYPE_ULONG | CTLFLAG_MPSAFE | CTLFLAG_RW, NULL, 0, 165 sysctl_pie_base, "LU", 166 "PIE load base without randomization"); 167 168 SYSCTL_NODE(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO, aslr, 169 CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 170 ""); 171 #define ASLR_NODE_OID __CONCAT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), _aslr) 172 173 /* 174 * While for 64-bit machines ASLR works properly, there are 175 * still some problems when using 32-bit architectures. For this 176 * reason ASLR is only enabled by default when running native 177 * 64-bit non-PIE executables. 178 */ 179 static int __elfN(aslr_enabled) = __ELF_WORD_SIZE == 64; 180 SYSCTL_INT(ASLR_NODE_OID, OID_AUTO, enable, CTLFLAG_RWTUN, 181 &__elfN(aslr_enabled), 0, 182 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) 183 ": enable address map randomization"); 184 185 /* 186 * Enable ASLR only for 64-bit PIE binaries by default. 187 */ 188 static int __elfN(pie_aslr_enabled) = __ELF_WORD_SIZE == 64; 189 SYSCTL_INT(ASLR_NODE_OID, OID_AUTO, pie_enable, CTLFLAG_RWTUN, 190 &__elfN(pie_aslr_enabled), 0, 191 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) 192 ": enable address map randomization for PIE binaries"); 193 194 /* 195 * Sbrk is now deprecated and it can be assumed, that in most 196 * cases it will not be used anyway. This setting is valid only 197 * for the ASLR enabled and allows for utilizing the bss grow region. 198 */ 199 static int __elfN(aslr_honor_sbrk) = 0; 200 SYSCTL_INT(ASLR_NODE_OID, OID_AUTO, honor_sbrk, CTLFLAG_RW, 201 &__elfN(aslr_honor_sbrk), 0, 202 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) ": assume sbrk is used"); 203 204 static int __elfN(aslr_stack_gap) = 3; 205 SYSCTL_INT(ASLR_NODE_OID, OID_AUTO, stack_gap, CTLFLAG_RW, 206 &__elfN(aslr_stack_gap), 0, 207 __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) 208 ": maximum percentage of main stack to waste on a random gap"); 209 210 static int __elfN(sigfastblock) = 1; 211 SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO, sigfastblock, 212 CTLFLAG_RWTUN, &__elfN(sigfastblock), 0, 213 "enable sigfastblock for new processes"); 214 215 static bool __elfN(allow_wx) = true; 216 SYSCTL_BOOL(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO, allow_wx, 217 CTLFLAG_RWTUN, &__elfN(allow_wx), 0, 218 "Allow pages to be mapped simultaneously writable and executable"); 219 220 static Elf_Brandinfo *elf_brand_list[MAX_BRANDS]; 221 222 #define aligned(a, t) (rounddown2((u_long)(a), sizeof(t)) == (u_long)(a)) 223 224 Elf_Brandnote __elfN(freebsd_brandnote) = { 225 .hdr.n_namesz = sizeof(FREEBSD_ABI_VENDOR), 226 .hdr.n_descsz = sizeof(int32_t), 227 .hdr.n_type = NT_FREEBSD_ABI_TAG, 228 .vendor = FREEBSD_ABI_VENDOR, 229 .flags = BN_TRANSLATE_OSREL, 230 .trans_osrel = __elfN(freebsd_trans_osrel) 231 }; 232 233 static bool 234 __elfN(freebsd_trans_osrel)(const Elf_Note *note, int32_t *osrel) 235 { 236 uintptr_t p; 237 238 p = (uintptr_t)(note + 1); 239 p += roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE); 240 *osrel = *(const int32_t *)(p); 241 242 return (true); 243 } 244 245 static const char GNU_ABI_VENDOR[] = "GNU"; 246 static int GNU_KFREEBSD_ABI_DESC = 3; 247 248 Elf_Brandnote __elfN(kfreebsd_brandnote) = { 249 .hdr.n_namesz = sizeof(GNU_ABI_VENDOR), 250 .hdr.n_descsz = 16, /* XXX at least 16 */ 251 .hdr.n_type = 1, 252 .vendor = GNU_ABI_VENDOR, 253 .flags = BN_TRANSLATE_OSREL, 254 .trans_osrel = kfreebsd_trans_osrel 255 }; 256 257 static bool 258 kfreebsd_trans_osrel(const Elf_Note *note, int32_t *osrel) 259 { 260 const Elf32_Word *desc; 261 uintptr_t p; 262 263 p = (uintptr_t)(note + 1); 264 p += roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE); 265 266 desc = (const Elf32_Word *)p; 267 if (desc[0] != GNU_KFREEBSD_ABI_DESC) 268 return (false); 269 270 /* 271 * Debian GNU/kFreeBSD embed the earliest compatible kernel version 272 * (__FreeBSD_version: <major><two digit minor>Rxx) in the LSB way. 273 */ 274 *osrel = desc[1] * 100000 + desc[2] * 1000 + desc[3]; 275 276 return (true); 277 } 278 279 int 280 __elfN(insert_brand_entry)(Elf_Brandinfo *entry) 281 { 282 int i; 283 284 for (i = 0; i < MAX_BRANDS; i++) { 285 if (elf_brand_list[i] == NULL) { 286 elf_brand_list[i] = entry; 287 break; 288 } 289 } 290 if (i == MAX_BRANDS) { 291 printf("WARNING: %s: could not insert brandinfo entry: %p\n", 292 __func__, entry); 293 return (-1); 294 } 295 return (0); 296 } 297 298 int 299 __elfN(remove_brand_entry)(Elf_Brandinfo *entry) 300 { 301 int i; 302 303 for (i = 0; i < MAX_BRANDS; i++) { 304 if (elf_brand_list[i] == entry) { 305 elf_brand_list[i] = NULL; 306 break; 307 } 308 } 309 if (i == MAX_BRANDS) 310 return (-1); 311 return (0); 312 } 313 314 bool 315 __elfN(brand_inuse)(Elf_Brandinfo *entry) 316 { 317 struct proc *p; 318 bool rval = false; 319 320 sx_slock(&allproc_lock); 321 FOREACH_PROC_IN_SYSTEM(p) { 322 if (p->p_sysent == entry->sysvec) { 323 rval = true; 324 break; 325 } 326 } 327 sx_sunlock(&allproc_lock); 328 329 return (rval); 330 } 331 332 static Elf_Brandinfo * 333 __elfN(get_brandinfo)(struct image_params *imgp, const char *interp, 334 int32_t *osrel, uint32_t *fctl0) 335 { 336 const Elf_Ehdr *hdr = (const Elf_Ehdr *)imgp->image_header; 337 Elf_Brandinfo *bi, *bi_m; 338 bool ret, has_fctl0; 339 int i, interp_name_len; 340 341 interp_name_len = interp != NULL ? strlen(interp) + 1 : 0; 342 343 /* 344 * We support four types of branding -- (1) the ELF EI_OSABI field 345 * that SCO added to the ELF spec, (2) FreeBSD 3.x's traditional string 346 * branding w/in the ELF header, (3) path of the `interp_path' 347 * field, and (4) the ".note.ABI-tag" ELF section. 348 */ 349 350 /* Look for an ".note.ABI-tag" ELF section */ 351 bi_m = NULL; 352 for (i = 0; i < MAX_BRANDS; i++) { 353 bi = elf_brand_list[i]; 354 if (bi == NULL) 355 continue; 356 if (interp != NULL && (bi->flags & BI_BRAND_ONLY_STATIC) != 0) 357 continue; 358 if (hdr->e_machine == bi->machine && (bi->flags & 359 (BI_BRAND_NOTE|BI_BRAND_NOTE_MANDATORY)) != 0) { 360 has_fctl0 = false; 361 *fctl0 = 0; 362 *osrel = 0; 363 ret = __elfN(check_note)(imgp, bi->brand_note, osrel, 364 &has_fctl0, fctl0); 365 /* Give brand a chance to veto check_note's guess */ 366 if (ret && bi->header_supported) { 367 ret = bi->header_supported(imgp, osrel, 368 has_fctl0 ? fctl0 : NULL); 369 } 370 /* 371 * If note checker claimed the binary, but the 372 * interpreter path in the image does not 373 * match default one for the brand, try to 374 * search for other brands with the same 375 * interpreter. Either there is better brand 376 * with the right interpreter, or, failing 377 * this, we return first brand which accepted 378 * our note and, optionally, header. 379 */ 380 if (ret && bi_m == NULL && interp != NULL && 381 (bi->interp_path == NULL || 382 (strlen(bi->interp_path) + 1 != interp_name_len || 383 strncmp(interp, bi->interp_path, interp_name_len) 384 != 0))) { 385 bi_m = bi; 386 ret = 0; 387 } 388 if (ret) 389 return (bi); 390 } 391 } 392 if (bi_m != NULL) 393 return (bi_m); 394 395 /* If the executable has a brand, search for it in the brand list. */ 396 for (i = 0; i < MAX_BRANDS; i++) { 397 bi = elf_brand_list[i]; 398 if (bi == NULL || (bi->flags & BI_BRAND_NOTE_MANDATORY) != 0 || 399 (interp != NULL && (bi->flags & BI_BRAND_ONLY_STATIC) != 0)) 400 continue; 401 if (hdr->e_machine == bi->machine && 402 (hdr->e_ident[EI_OSABI] == bi->brand || 403 (bi->compat_3_brand != NULL && 404 strcmp((const char *)&hdr->e_ident[OLD_EI_BRAND], 405 bi->compat_3_brand) == 0))) { 406 /* Looks good, but give brand a chance to veto */ 407 if (bi->header_supported == NULL || 408 bi->header_supported(imgp, NULL, NULL)) { 409 /* 410 * Again, prefer strictly matching 411 * interpreter path. 412 */ 413 if (interp_name_len == 0 && 414 bi->interp_path == NULL) 415 return (bi); 416 if (bi->interp_path != NULL && 417 strlen(bi->interp_path) + 1 == 418 interp_name_len && strncmp(interp, 419 bi->interp_path, interp_name_len) == 0) 420 return (bi); 421 if (bi_m == NULL) 422 bi_m = bi; 423 } 424 } 425 } 426 if (bi_m != NULL) 427 return (bi_m); 428 429 /* No known brand, see if the header is recognized by any brand */ 430 for (i = 0; i < MAX_BRANDS; i++) { 431 bi = elf_brand_list[i]; 432 if (bi == NULL || bi->flags & BI_BRAND_NOTE_MANDATORY || 433 bi->header_supported == NULL) 434 continue; 435 if (hdr->e_machine == bi->machine) { 436 ret = bi->header_supported(imgp, NULL, NULL); 437 if (ret) 438 return (bi); 439 } 440 } 441 442 /* Lacking a known brand, search for a recognized interpreter. */ 443 if (interp != NULL) { 444 for (i = 0; i < MAX_BRANDS; i++) { 445 bi = elf_brand_list[i]; 446 if (bi == NULL || (bi->flags & 447 (BI_BRAND_NOTE_MANDATORY | BI_BRAND_ONLY_STATIC)) 448 != 0) 449 continue; 450 if (hdr->e_machine == bi->machine && 451 bi->interp_path != NULL && 452 /* ELF image p_filesz includes terminating zero */ 453 strlen(bi->interp_path) + 1 == interp_name_len && 454 strncmp(interp, bi->interp_path, interp_name_len) 455 == 0 && (bi->header_supported == NULL || 456 bi->header_supported(imgp, NULL, NULL))) 457 return (bi); 458 } 459 } 460 461 /* Lacking a recognized interpreter, try the default brand */ 462 for (i = 0; i < MAX_BRANDS; i++) { 463 bi = elf_brand_list[i]; 464 if (bi == NULL || (bi->flags & BI_BRAND_NOTE_MANDATORY) != 0 || 465 (interp != NULL && (bi->flags & BI_BRAND_ONLY_STATIC) != 0)) 466 continue; 467 if (hdr->e_machine == bi->machine && 468 __elfN(fallback_brand) == bi->brand && 469 (bi->header_supported == NULL || 470 bi->header_supported(imgp, NULL, NULL))) 471 return (bi); 472 } 473 return (NULL); 474 } 475 476 static bool 477 __elfN(phdr_in_zero_page)(const Elf_Ehdr *hdr) 478 { 479 return (hdr->e_phoff <= PAGE_SIZE && 480 (u_int)hdr->e_phentsize * hdr->e_phnum <= PAGE_SIZE - hdr->e_phoff); 481 } 482 483 static int 484 __elfN(check_header)(const Elf_Ehdr *hdr) 485 { 486 Elf_Brandinfo *bi; 487 int i; 488 489 if (!IS_ELF(*hdr) || 490 hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS || 491 hdr->e_ident[EI_DATA] != ELF_TARG_DATA || 492 hdr->e_ident[EI_VERSION] != EV_CURRENT || 493 hdr->e_phentsize != sizeof(Elf_Phdr) || 494 hdr->e_version != ELF_TARG_VER) 495 return (ENOEXEC); 496 497 /* 498 * Make sure we have at least one brand for this machine. 499 */ 500 501 for (i = 0; i < MAX_BRANDS; i++) { 502 bi = elf_brand_list[i]; 503 if (bi != NULL && bi->machine == hdr->e_machine) 504 break; 505 } 506 if (i == MAX_BRANDS) 507 return (ENOEXEC); 508 509 return (0); 510 } 511 512 static int 513 __elfN(map_partial)(vm_map_t map, vm_object_t object, vm_ooffset_t offset, 514 vm_offset_t start, vm_offset_t end, vm_prot_t prot) 515 { 516 struct sf_buf *sf; 517 int error; 518 vm_offset_t off; 519 520 /* 521 * Create the page if it doesn't exist yet. Ignore errors. 522 */ 523 vm_map_fixed(map, NULL, 0, trunc_page(start), round_page(end) - 524 trunc_page(start), VM_PROT_ALL, VM_PROT_ALL, MAP_CHECK_EXCL); 525 526 /* 527 * Find the page from the underlying object. 528 */ 529 if (object != NULL) { 530 sf = vm_imgact_map_page(object, offset); 531 if (sf == NULL) 532 return (KERN_FAILURE); 533 off = offset - trunc_page(offset); 534 error = copyout((caddr_t)sf_buf_kva(sf) + off, (caddr_t)start, 535 end - start); 536 vm_imgact_unmap_page(sf); 537 if (error != 0) 538 return (KERN_FAILURE); 539 } 540 541 return (KERN_SUCCESS); 542 } 543 544 static int 545 __elfN(map_insert)(struct image_params *imgp, vm_map_t map, vm_object_t object, 546 vm_ooffset_t offset, vm_offset_t start, vm_offset_t end, vm_prot_t prot, 547 int cow) 548 { 549 struct sf_buf *sf; 550 vm_offset_t off; 551 vm_size_t sz; 552 int error, locked, rv; 553 554 if (start != trunc_page(start)) { 555 rv = __elfN(map_partial)(map, object, offset, start, 556 round_page(start), prot); 557 if (rv != KERN_SUCCESS) 558 return (rv); 559 offset += round_page(start) - start; 560 start = round_page(start); 561 } 562 if (end != round_page(end)) { 563 rv = __elfN(map_partial)(map, object, offset + 564 trunc_page(end) - start, trunc_page(end), end, prot); 565 if (rv != KERN_SUCCESS) 566 return (rv); 567 end = trunc_page(end); 568 } 569 if (start >= end) 570 return (KERN_SUCCESS); 571 if ((offset & PAGE_MASK) != 0) { 572 /* 573 * The mapping is not page aligned. This means that we have 574 * to copy the data. 575 */ 576 rv = vm_map_fixed(map, NULL, 0, start, end - start, 577 prot | VM_PROT_WRITE, VM_PROT_ALL, MAP_CHECK_EXCL); 578 if (rv != KERN_SUCCESS) 579 return (rv); 580 if (object == NULL) 581 return (KERN_SUCCESS); 582 for (; start < end; start += sz) { 583 sf = vm_imgact_map_page(object, offset); 584 if (sf == NULL) 585 return (KERN_FAILURE); 586 off = offset - trunc_page(offset); 587 sz = end - start; 588 if (sz > PAGE_SIZE - off) 589 sz = PAGE_SIZE - off; 590 error = copyout((caddr_t)sf_buf_kva(sf) + off, 591 (caddr_t)start, sz); 592 vm_imgact_unmap_page(sf); 593 if (error != 0) 594 return (KERN_FAILURE); 595 offset += sz; 596 } 597 } else { 598 vm_object_reference(object); 599 rv = vm_map_fixed(map, object, offset, start, end - start, 600 prot, VM_PROT_ALL, cow | MAP_CHECK_EXCL | 601 (object != NULL ? MAP_VN_EXEC : 0)); 602 if (rv != KERN_SUCCESS) { 603 locked = VOP_ISLOCKED(imgp->vp); 604 VOP_UNLOCK(imgp->vp); 605 vm_object_deallocate(object); 606 vn_lock(imgp->vp, locked | LK_RETRY); 607 return (rv); 608 } else if (object != NULL) { 609 MPASS(imgp->vp->v_object == object); 610 VOP_SET_TEXT_CHECKED(imgp->vp); 611 } 612 } 613 return (KERN_SUCCESS); 614 } 615 616 static int 617 __elfN(load_section)(struct image_params *imgp, vm_ooffset_t offset, 618 caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot) 619 { 620 struct sf_buf *sf; 621 size_t map_len; 622 vm_map_t map; 623 vm_object_t object; 624 vm_offset_t map_addr; 625 int error, rv, cow; 626 size_t copy_len; 627 vm_ooffset_t file_addr; 628 629 /* 630 * It's necessary to fail if the filsz + offset taken from the 631 * header is greater than the actual file pager object's size. 632 * If we were to allow this, then the vm_map_find() below would 633 * walk right off the end of the file object and into the ether. 634 * 635 * While I'm here, might as well check for something else that 636 * is invalid: filsz cannot be greater than memsz. 637 */ 638 if ((filsz != 0 && (off_t)filsz + offset > imgp->attr->va_size) || 639 filsz > memsz) { 640 uprintf("elf_load_section: truncated ELF file\n"); 641 return (ENOEXEC); 642 } 643 644 object = imgp->object; 645 map = &imgp->proc->p_vmspace->vm_map; 646 map_addr = trunc_page((vm_offset_t)vmaddr); 647 file_addr = trunc_page(offset); 648 649 /* 650 * We have two choices. We can either clear the data in the last page 651 * of an oversized mapping, or we can start the anon mapping a page 652 * early and copy the initialized data into that first page. We 653 * choose the second. 654 */ 655 if (filsz == 0) 656 map_len = 0; 657 else if (memsz > filsz) 658 map_len = trunc_page(offset + filsz) - file_addr; 659 else 660 map_len = round_page(offset + filsz) - file_addr; 661 662 if (map_len != 0) { 663 /* cow flags: don't dump readonly sections in core */ 664 cow = MAP_COPY_ON_WRITE | MAP_PREFAULT | 665 (prot & VM_PROT_WRITE ? 0 : MAP_DISABLE_COREDUMP); 666 667 rv = __elfN(map_insert)(imgp, map, object, file_addr, 668 map_addr, map_addr + map_len, prot, cow); 669 if (rv != KERN_SUCCESS) 670 return (EINVAL); 671 672 /* we can stop now if we've covered it all */ 673 if (memsz == filsz) 674 return (0); 675 } 676 677 /* 678 * We have to get the remaining bit of the file into the first part 679 * of the oversized map segment. This is normally because the .data 680 * segment in the file is extended to provide bss. It's a neat idea 681 * to try and save a page, but it's a pain in the behind to implement. 682 */ 683 copy_len = filsz == 0 ? 0 : (offset + filsz) - trunc_page(offset + 684 filsz); 685 map_addr = trunc_page((vm_offset_t)vmaddr + filsz); 686 map_len = round_page((vm_offset_t)vmaddr + memsz) - map_addr; 687 688 /* This had damn well better be true! */ 689 if (map_len != 0) { 690 rv = __elfN(map_insert)(imgp, map, NULL, 0, map_addr, 691 map_addr + map_len, prot, 0); 692 if (rv != KERN_SUCCESS) 693 return (EINVAL); 694 } 695 696 if (copy_len != 0) { 697 sf = vm_imgact_map_page(object, offset + filsz); 698 if (sf == NULL) 699 return (EIO); 700 701 /* send the page fragment to user space */ 702 error = copyout((caddr_t)sf_buf_kva(sf), (caddr_t)map_addr, 703 copy_len); 704 vm_imgact_unmap_page(sf); 705 if (error != 0) 706 return (error); 707 } 708 709 /* 710 * Remove write access to the page if it was only granted by map_insert 711 * to allow copyout. 712 */ 713 if ((prot & VM_PROT_WRITE) == 0) 714 vm_map_protect(map, trunc_page(map_addr), round_page(map_addr + 715 map_len), prot, 0, VM_MAP_PROTECT_SET_PROT); 716 717 return (0); 718 } 719 720 static int 721 __elfN(load_sections)(struct image_params *imgp, const Elf_Ehdr *hdr, 722 const Elf_Phdr *phdr, u_long rbase, u_long *base_addrp) 723 { 724 vm_prot_t prot; 725 u_long base_addr; 726 bool first; 727 int error, i; 728 729 ASSERT_VOP_LOCKED(imgp->vp, __func__); 730 731 base_addr = 0; 732 first = true; 733 734 for (i = 0; i < hdr->e_phnum; i++) { 735 if (phdr[i].p_type != PT_LOAD || phdr[i].p_memsz == 0) 736 continue; 737 738 /* Loadable segment */ 739 prot = __elfN(trans_prot)(phdr[i].p_flags); 740 error = __elfN(load_section)(imgp, phdr[i].p_offset, 741 (caddr_t)(uintptr_t)phdr[i].p_vaddr + rbase, 742 phdr[i].p_memsz, phdr[i].p_filesz, prot); 743 if (error != 0) 744 return (error); 745 746 /* 747 * Establish the base address if this is the first segment. 748 */ 749 if (first) { 750 base_addr = trunc_page(phdr[i].p_vaddr + rbase); 751 first = false; 752 } 753 } 754 755 if (base_addrp != NULL) 756 *base_addrp = base_addr; 757 758 return (0); 759 } 760 761 /* 762 * Load the file "file" into memory. It may be either a shared object 763 * or an executable. 764 * 765 * The "addr" reference parameter is in/out. On entry, it specifies 766 * the address where a shared object should be loaded. If the file is 767 * an executable, this value is ignored. On exit, "addr" specifies 768 * where the file was actually loaded. 769 * 770 * The "entry" reference parameter is out only. On exit, it specifies 771 * the entry point for the loaded file. 772 */ 773 static int 774 __elfN(load_file)(struct proc *p, const char *file, u_long *addr, 775 u_long *entry) 776 { 777 struct { 778 struct nameidata nd; 779 struct vattr attr; 780 struct image_params image_params; 781 } *tempdata; 782 const Elf_Ehdr *hdr = NULL; 783 const Elf_Phdr *phdr = NULL; 784 struct nameidata *nd; 785 struct vattr *attr; 786 struct image_params *imgp; 787 u_long rbase; 788 u_long base_addr = 0; 789 int error; 790 791 #ifdef CAPABILITY_MODE 792 /* 793 * XXXJA: This check can go away once we are sufficiently confident 794 * that the checks in namei() are correct. 795 */ 796 if (IN_CAPABILITY_MODE(curthread)) 797 return (ECAPMODE); 798 #endif 799 800 tempdata = malloc(sizeof(*tempdata), M_TEMP, M_WAITOK | M_ZERO); 801 nd = &tempdata->nd; 802 attr = &tempdata->attr; 803 imgp = &tempdata->image_params; 804 805 /* 806 * Initialize part of the common data 807 */ 808 imgp->proc = p; 809 imgp->attr = attr; 810 811 NDINIT(nd, LOOKUP, ISOPEN | FOLLOW | LOCKSHARED | LOCKLEAF, 812 UIO_SYSSPACE, file); 813 if ((error = namei(nd)) != 0) { 814 nd->ni_vp = NULL; 815 goto fail; 816 } 817 NDFREE(nd, NDF_ONLY_PNBUF); 818 imgp->vp = nd->ni_vp; 819 820 /* 821 * Check permissions, modes, uid, etc on the file, and "open" it. 822 */ 823 error = exec_check_permissions(imgp); 824 if (error) 825 goto fail; 826 827 error = exec_map_first_page(imgp); 828 if (error) 829 goto fail; 830 831 imgp->object = nd->ni_vp->v_object; 832 833 hdr = (const Elf_Ehdr *)imgp->image_header; 834 if ((error = __elfN(check_header)(hdr)) != 0) 835 goto fail; 836 if (hdr->e_type == ET_DYN) 837 rbase = *addr; 838 else if (hdr->e_type == ET_EXEC) 839 rbase = 0; 840 else { 841 error = ENOEXEC; 842 goto fail; 843 } 844 845 /* Only support headers that fit within first page for now */ 846 if (!__elfN(phdr_in_zero_page)(hdr)) { 847 error = ENOEXEC; 848 goto fail; 849 } 850 851 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 852 if (!aligned(phdr, Elf_Addr)) { 853 error = ENOEXEC; 854 goto fail; 855 } 856 857 error = __elfN(load_sections)(imgp, hdr, phdr, rbase, &base_addr); 858 if (error != 0) 859 goto fail; 860 861 *addr = base_addr; 862 *entry = (unsigned long)hdr->e_entry + rbase; 863 864 fail: 865 if (imgp->firstpage) 866 exec_unmap_first_page(imgp); 867 868 if (nd->ni_vp) { 869 if (imgp->textset) 870 VOP_UNSET_TEXT_CHECKED(nd->ni_vp); 871 vput(nd->ni_vp); 872 } 873 free(tempdata, M_TEMP); 874 875 return (error); 876 } 877 878 static u_long 879 __CONCAT(rnd_, __elfN(base))(vm_map_t map __unused, u_long minv, u_long maxv, 880 u_int align) 881 { 882 u_long rbase, res; 883 884 MPASS(vm_map_min(map) <= minv); 885 MPASS(maxv <= vm_map_max(map)); 886 MPASS(minv < maxv); 887 MPASS(minv + align < maxv); 888 arc4rand(&rbase, sizeof(rbase), 0); 889 res = roundup(minv, (u_long)align) + rbase % (maxv - minv); 890 res &= ~((u_long)align - 1); 891 if (res >= maxv) 892 res -= align; 893 KASSERT(res >= minv, 894 ("res %#lx < minv %#lx, maxv %#lx rbase %#lx", 895 res, minv, maxv, rbase)); 896 KASSERT(res < maxv, 897 ("res %#lx > maxv %#lx, minv %#lx rbase %#lx", 898 res, maxv, minv, rbase)); 899 return (res); 900 } 901 902 static int 903 __elfN(enforce_limits)(struct image_params *imgp, const Elf_Ehdr *hdr, 904 const Elf_Phdr *phdr, u_long et_dyn_addr) 905 { 906 struct vmspace *vmspace; 907 const char *err_str; 908 u_long text_size, data_size, total_size, text_addr, data_addr; 909 u_long seg_size, seg_addr; 910 int i; 911 912 err_str = NULL; 913 text_size = data_size = total_size = text_addr = data_addr = 0; 914 915 for (i = 0; i < hdr->e_phnum; i++) { 916 if (phdr[i].p_type != PT_LOAD || phdr[i].p_memsz == 0) 917 continue; 918 919 seg_addr = trunc_page(phdr[i].p_vaddr + et_dyn_addr); 920 seg_size = round_page(phdr[i].p_memsz + 921 phdr[i].p_vaddr + et_dyn_addr - seg_addr); 922 923 /* 924 * Make the largest executable segment the official 925 * text segment and all others data. 926 * 927 * Note that obreak() assumes that data_addr + data_size == end 928 * of data load area, and the ELF file format expects segments 929 * to be sorted by address. If multiple data segments exist, 930 * the last one will be used. 931 */ 932 933 if ((phdr[i].p_flags & PF_X) != 0 && text_size < seg_size) { 934 text_size = seg_size; 935 text_addr = seg_addr; 936 } else { 937 data_size = seg_size; 938 data_addr = seg_addr; 939 } 940 total_size += seg_size; 941 } 942 943 if (data_addr == 0 && data_size == 0) { 944 data_addr = text_addr; 945 data_size = text_size; 946 } 947 948 /* 949 * Check limits. It should be safe to check the 950 * limits after loading the segments since we do 951 * not actually fault in all the segments pages. 952 */ 953 PROC_LOCK(imgp->proc); 954 if (data_size > lim_cur_proc(imgp->proc, RLIMIT_DATA)) 955 err_str = "Data segment size exceeds process limit"; 956 else if (text_size > maxtsiz) 957 err_str = "Text segment size exceeds system limit"; 958 else if (total_size > lim_cur_proc(imgp->proc, RLIMIT_VMEM)) 959 err_str = "Total segment size exceeds process limit"; 960 else if (racct_set(imgp->proc, RACCT_DATA, data_size) != 0) 961 err_str = "Data segment size exceeds resource limit"; 962 else if (racct_set(imgp->proc, RACCT_VMEM, total_size) != 0) 963 err_str = "Total segment size exceeds resource limit"; 964 PROC_UNLOCK(imgp->proc); 965 if (err_str != NULL) { 966 uprintf("%s\n", err_str); 967 return (ENOMEM); 968 } 969 970 vmspace = imgp->proc->p_vmspace; 971 vmspace->vm_tsize = text_size >> PAGE_SHIFT; 972 vmspace->vm_taddr = (caddr_t)(uintptr_t)text_addr; 973 vmspace->vm_dsize = data_size >> PAGE_SHIFT; 974 vmspace->vm_daddr = (caddr_t)(uintptr_t)data_addr; 975 976 return (0); 977 } 978 979 static int 980 __elfN(get_interp)(struct image_params *imgp, const Elf_Phdr *phdr, 981 char **interpp, bool *free_interpp) 982 { 983 struct thread *td; 984 char *interp; 985 int error, interp_name_len; 986 987 KASSERT(phdr->p_type == PT_INTERP, 988 ("%s: p_type %u != PT_INTERP", __func__, phdr->p_type)); 989 ASSERT_VOP_LOCKED(imgp->vp, __func__); 990 991 td = curthread; 992 993 /* Path to interpreter */ 994 if (phdr->p_filesz < 2 || phdr->p_filesz > MAXPATHLEN) { 995 uprintf("Invalid PT_INTERP\n"); 996 return (ENOEXEC); 997 } 998 999 interp_name_len = phdr->p_filesz; 1000 if (phdr->p_offset > PAGE_SIZE || 1001 interp_name_len > PAGE_SIZE - phdr->p_offset) { 1002 /* 1003 * The vnode lock might be needed by the pagedaemon to 1004 * clean pages owned by the vnode. Do not allow sleep 1005 * waiting for memory with the vnode locked, instead 1006 * try non-sleepable allocation first, and if it 1007 * fails, go to the slow path were we drop the lock 1008 * and do M_WAITOK. A text reference prevents 1009 * modifications to the vnode content. 1010 */ 1011 interp = malloc(interp_name_len + 1, M_TEMP, M_NOWAIT); 1012 if (interp == NULL) { 1013 VOP_UNLOCK(imgp->vp); 1014 interp = malloc(interp_name_len + 1, M_TEMP, M_WAITOK); 1015 vn_lock(imgp->vp, LK_SHARED | LK_RETRY); 1016 } 1017 1018 error = vn_rdwr(UIO_READ, imgp->vp, interp, 1019 interp_name_len, phdr->p_offset, 1020 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, 1021 NOCRED, NULL, td); 1022 if (error != 0) { 1023 free(interp, M_TEMP); 1024 uprintf("i/o error PT_INTERP %d\n", error); 1025 return (error); 1026 } 1027 interp[interp_name_len] = '\0'; 1028 1029 *interpp = interp; 1030 *free_interpp = true; 1031 return (0); 1032 } 1033 1034 interp = __DECONST(char *, imgp->image_header) + phdr->p_offset; 1035 if (interp[interp_name_len - 1] != '\0') { 1036 uprintf("Invalid PT_INTERP\n"); 1037 return (ENOEXEC); 1038 } 1039 1040 *interpp = interp; 1041 *free_interpp = false; 1042 return (0); 1043 } 1044 1045 static int 1046 __elfN(load_interp)(struct image_params *imgp, const Elf_Brandinfo *brand_info, 1047 const char *interp, u_long *addr, u_long *entry) 1048 { 1049 char *path; 1050 int error; 1051 1052 if (brand_info->emul_path != NULL && 1053 brand_info->emul_path[0] != '\0') { 1054 path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 1055 snprintf(path, MAXPATHLEN, "%s%s", 1056 brand_info->emul_path, interp); 1057 error = __elfN(load_file)(imgp->proc, path, addr, entry); 1058 free(path, M_TEMP); 1059 if (error == 0) 1060 return (0); 1061 } 1062 1063 if (brand_info->interp_newpath != NULL && 1064 (brand_info->interp_path == NULL || 1065 strcmp(interp, brand_info->interp_path) == 0)) { 1066 error = __elfN(load_file)(imgp->proc, 1067 brand_info->interp_newpath, addr, entry); 1068 if (error == 0) 1069 return (0); 1070 } 1071 1072 error = __elfN(load_file)(imgp->proc, interp, addr, entry); 1073 if (error == 0) 1074 return (0); 1075 1076 uprintf("ELF interpreter %s not found, error %d\n", interp, error); 1077 return (error); 1078 } 1079 1080 /* 1081 * Impossible et_dyn_addr initial value indicating that the real base 1082 * must be calculated later with some randomization applied. 1083 */ 1084 #define ET_DYN_ADDR_RAND 1 1085 1086 static int 1087 __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp) 1088 { 1089 struct thread *td; 1090 const Elf_Ehdr *hdr; 1091 const Elf_Phdr *phdr; 1092 Elf_Auxargs *elf_auxargs; 1093 struct vmspace *vmspace; 1094 vm_map_t map; 1095 char *interp; 1096 Elf_Brandinfo *brand_info; 1097 struct sysentvec *sv; 1098 u_long addr, baddr, et_dyn_addr, entry, proghdr; 1099 u_long maxalign, mapsz, maxv, maxv1; 1100 uint32_t fctl0; 1101 int32_t osrel; 1102 bool free_interp; 1103 int error, i, n; 1104 1105 hdr = (const Elf_Ehdr *)imgp->image_header; 1106 1107 /* 1108 * Do we have a valid ELF header ? 1109 * 1110 * Only allow ET_EXEC & ET_DYN here, reject ET_DYN later 1111 * if particular brand doesn't support it. 1112 */ 1113 if (__elfN(check_header)(hdr) != 0 || 1114 (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN)) 1115 return (-1); 1116 1117 /* 1118 * From here on down, we return an errno, not -1, as we've 1119 * detected an ELF file. 1120 */ 1121 1122 if (!__elfN(phdr_in_zero_page)(hdr)) { 1123 uprintf("Program headers not in the first page\n"); 1124 return (ENOEXEC); 1125 } 1126 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 1127 if (!aligned(phdr, Elf_Addr)) { 1128 uprintf("Unaligned program headers\n"); 1129 return (ENOEXEC); 1130 } 1131 1132 n = error = 0; 1133 baddr = 0; 1134 osrel = 0; 1135 fctl0 = 0; 1136 entry = proghdr = 0; 1137 interp = NULL; 1138 free_interp = false; 1139 td = curthread; 1140 maxalign = PAGE_SIZE; 1141 mapsz = 0; 1142 1143 for (i = 0; i < hdr->e_phnum; i++) { 1144 switch (phdr[i].p_type) { 1145 case PT_LOAD: 1146 if (n == 0) 1147 baddr = phdr[i].p_vaddr; 1148 if (phdr[i].p_align > maxalign) 1149 maxalign = phdr[i].p_align; 1150 mapsz += phdr[i].p_memsz; 1151 n++; 1152 1153 /* 1154 * If this segment contains the program headers, 1155 * remember their virtual address for the AT_PHDR 1156 * aux entry. Static binaries don't usually include 1157 * a PT_PHDR entry. 1158 */ 1159 if (phdr[i].p_offset == 0 && 1160 hdr->e_phoff + hdr->e_phnum * hdr->e_phentsize 1161 <= phdr[i].p_filesz) 1162 proghdr = phdr[i].p_vaddr + hdr->e_phoff; 1163 break; 1164 case PT_INTERP: 1165 /* Path to interpreter */ 1166 if (interp != NULL) { 1167 uprintf("Multiple PT_INTERP headers\n"); 1168 error = ENOEXEC; 1169 goto ret; 1170 } 1171 error = __elfN(get_interp)(imgp, &phdr[i], &interp, 1172 &free_interp); 1173 if (error != 0) 1174 goto ret; 1175 break; 1176 case PT_GNU_STACK: 1177 if (__elfN(nxstack)) 1178 imgp->stack_prot = 1179 __elfN(trans_prot)(phdr[i].p_flags); 1180 imgp->stack_sz = phdr[i].p_memsz; 1181 break; 1182 case PT_PHDR: /* Program header table info */ 1183 proghdr = phdr[i].p_vaddr; 1184 break; 1185 } 1186 } 1187 1188 brand_info = __elfN(get_brandinfo)(imgp, interp, &osrel, &fctl0); 1189 if (brand_info == NULL) { 1190 uprintf("ELF binary type \"%u\" not known.\n", 1191 hdr->e_ident[EI_OSABI]); 1192 error = ENOEXEC; 1193 goto ret; 1194 } 1195 sv = brand_info->sysvec; 1196 et_dyn_addr = 0; 1197 if (hdr->e_type == ET_DYN) { 1198 if ((brand_info->flags & BI_CAN_EXEC_DYN) == 0) { 1199 uprintf("Cannot execute shared object\n"); 1200 error = ENOEXEC; 1201 goto ret; 1202 } 1203 /* 1204 * Honour the base load address from the dso if it is 1205 * non-zero for some reason. 1206 */ 1207 if (baddr == 0) { 1208 if ((sv->sv_flags & SV_ASLR) == 0 || 1209 (fctl0 & NT_FREEBSD_FCTL_ASLR_DISABLE) != 0) 1210 et_dyn_addr = __elfN(pie_base); 1211 else if ((__elfN(pie_aslr_enabled) && 1212 (imgp->proc->p_flag2 & P2_ASLR_DISABLE) == 0) || 1213 (imgp->proc->p_flag2 & P2_ASLR_ENABLE) != 0) 1214 et_dyn_addr = ET_DYN_ADDR_RAND; 1215 else 1216 et_dyn_addr = __elfN(pie_base); 1217 } 1218 } 1219 1220 /* 1221 * Avoid a possible deadlock if the current address space is destroyed 1222 * and that address space maps the locked vnode. In the common case, 1223 * the locked vnode's v_usecount is decremented but remains greater 1224 * than zero. Consequently, the vnode lock is not needed by vrele(). 1225 * However, in cases where the vnode lock is external, such as nullfs, 1226 * v_usecount may become zero. 1227 * 1228 * The VV_TEXT flag prevents modifications to the executable while 1229 * the vnode is unlocked. 1230 */ 1231 VOP_UNLOCK(imgp->vp); 1232 1233 /* 1234 * Decide whether to enable randomization of user mappings. 1235 * First, reset user preferences for the setid binaries. 1236 * Then, account for the support of the randomization by the 1237 * ABI, by user preferences, and make special treatment for 1238 * PIE binaries. 1239 */ 1240 if (imgp->credential_setid) { 1241 PROC_LOCK(imgp->proc); 1242 imgp->proc->p_flag2 &= ~(P2_ASLR_ENABLE | P2_ASLR_DISABLE | 1243 P2_WXORX_DISABLE | P2_WXORX_ENABLE_EXEC); 1244 PROC_UNLOCK(imgp->proc); 1245 } 1246 if ((sv->sv_flags & SV_ASLR) == 0 || 1247 (imgp->proc->p_flag2 & P2_ASLR_DISABLE) != 0 || 1248 (fctl0 & NT_FREEBSD_FCTL_ASLR_DISABLE) != 0) { 1249 KASSERT(et_dyn_addr != ET_DYN_ADDR_RAND, 1250 ("et_dyn_addr == RAND and !ASLR")); 1251 } else if ((imgp->proc->p_flag2 & P2_ASLR_ENABLE) != 0 || 1252 (__elfN(aslr_enabled) && hdr->e_type == ET_EXEC) || 1253 et_dyn_addr == ET_DYN_ADDR_RAND) { 1254 imgp->map_flags |= MAP_ASLR; 1255 /* 1256 * If user does not care about sbrk, utilize the bss 1257 * grow region for mappings as well. We can select 1258 * the base for the image anywere and still not suffer 1259 * from the fragmentation. 1260 */ 1261 if (!__elfN(aslr_honor_sbrk) || 1262 (imgp->proc->p_flag2 & P2_ASLR_IGNSTART) != 0) 1263 imgp->map_flags |= MAP_ASLR_IGNSTART; 1264 } 1265 1266 if ((!__elfN(allow_wx) && (fctl0 & NT_FREEBSD_FCTL_WXNEEDED) == 0 && 1267 (imgp->proc->p_flag2 & P2_WXORX_DISABLE) == 0) || 1268 (imgp->proc->p_flag2 & P2_WXORX_ENABLE_EXEC) != 0) 1269 imgp->map_flags |= MAP_WXORX; 1270 1271 error = exec_new_vmspace(imgp, sv); 1272 vmspace = imgp->proc->p_vmspace; 1273 map = &vmspace->vm_map; 1274 1275 imgp->proc->p_sysent = sv; 1276 imgp->proc->p_elf_brandinfo = brand_info; 1277 1278 maxv = vm_map_max(map) - lim_max(td, RLIMIT_STACK); 1279 if (et_dyn_addr == ET_DYN_ADDR_RAND) { 1280 KASSERT((map->flags & MAP_ASLR) != 0, 1281 ("ET_DYN_ADDR_RAND but !MAP_ASLR")); 1282 et_dyn_addr = __CONCAT(rnd_, __elfN(base))(map, 1283 vm_map_min(map) + mapsz + lim_max(td, RLIMIT_DATA), 1284 /* reserve half of the address space to interpreter */ 1285 maxv / 2, 1UL << flsl(maxalign)); 1286 } 1287 1288 vn_lock(imgp->vp, LK_SHARED | LK_RETRY); 1289 if (error != 0) 1290 goto ret; 1291 1292 error = __elfN(load_sections)(imgp, hdr, phdr, et_dyn_addr, NULL); 1293 if (error != 0) 1294 goto ret; 1295 1296 error = __elfN(enforce_limits)(imgp, hdr, phdr, et_dyn_addr); 1297 if (error != 0) 1298 goto ret; 1299 1300 entry = (u_long)hdr->e_entry + et_dyn_addr; 1301 1302 /* 1303 * We load the dynamic linker where a userland call 1304 * to mmap(0, ...) would put it. The rationale behind this 1305 * calculation is that it leaves room for the heap to grow to 1306 * its maximum allowed size. 1307 */ 1308 addr = round_page((vm_offset_t)vmspace->vm_daddr + lim_max(td, 1309 RLIMIT_DATA)); 1310 if ((map->flags & MAP_ASLR) != 0) { 1311 maxv1 = maxv / 2 + addr / 2; 1312 MPASS(maxv1 >= addr); /* No overflow */ 1313 map->anon_loc = __CONCAT(rnd_, __elfN(base))(map, addr, maxv1, 1314 (MAXPAGESIZES > 1 && pagesizes[1] != 0) ? 1315 pagesizes[1] : pagesizes[0]); 1316 } else { 1317 map->anon_loc = addr; 1318 } 1319 1320 imgp->entry_addr = entry; 1321 1322 if (interp != NULL) { 1323 VOP_UNLOCK(imgp->vp); 1324 if ((map->flags & MAP_ASLR) != 0) { 1325 /* Assume that interpreter fits into 1/4 of AS */ 1326 maxv1 = maxv / 2 + addr / 2; 1327 MPASS(maxv1 >= addr); /* No overflow */ 1328 addr = __CONCAT(rnd_, __elfN(base))(map, addr, 1329 maxv1, PAGE_SIZE); 1330 } 1331 error = __elfN(load_interp)(imgp, brand_info, interp, &addr, 1332 &imgp->entry_addr); 1333 vn_lock(imgp->vp, LK_SHARED | LK_RETRY); 1334 if (error != 0) 1335 goto ret; 1336 } else 1337 addr = et_dyn_addr; 1338 1339 /* 1340 * Construct auxargs table (used by the copyout_auxargs routine) 1341 */ 1342 elf_auxargs = malloc(sizeof(Elf_Auxargs), M_TEMP, M_NOWAIT); 1343 if (elf_auxargs == NULL) { 1344 VOP_UNLOCK(imgp->vp); 1345 elf_auxargs = malloc(sizeof(Elf_Auxargs), M_TEMP, M_WAITOK); 1346 vn_lock(imgp->vp, LK_SHARED | LK_RETRY); 1347 } 1348 elf_auxargs->execfd = -1; 1349 elf_auxargs->phdr = proghdr + et_dyn_addr; 1350 elf_auxargs->phent = hdr->e_phentsize; 1351 elf_auxargs->phnum = hdr->e_phnum; 1352 elf_auxargs->pagesz = PAGE_SIZE; 1353 elf_auxargs->base = addr; 1354 elf_auxargs->flags = 0; 1355 elf_auxargs->entry = entry; 1356 elf_auxargs->hdr_eflags = hdr->e_flags; 1357 1358 imgp->auxargs = elf_auxargs; 1359 imgp->interpreted = 0; 1360 imgp->reloc_base = addr; 1361 imgp->proc->p_osrel = osrel; 1362 imgp->proc->p_fctl0 = fctl0; 1363 imgp->proc->p_elf_flags = hdr->e_flags; 1364 1365 ret: 1366 if (free_interp) 1367 free(interp, M_TEMP); 1368 return (error); 1369 } 1370 1371 #define elf_suword __CONCAT(suword, __ELF_WORD_SIZE) 1372 1373 int 1374 __elfN(freebsd_copyout_auxargs)(struct image_params *imgp, uintptr_t base) 1375 { 1376 Elf_Auxargs *args = (Elf_Auxargs *)imgp->auxargs; 1377 Elf_Auxinfo *argarray, *pos; 1378 int error; 1379 1380 argarray = pos = malloc(AT_COUNT * sizeof(*pos), M_TEMP, 1381 M_WAITOK | M_ZERO); 1382 1383 if (args->execfd != -1) 1384 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd); 1385 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr); 1386 AUXARGS_ENTRY(pos, AT_PHENT, args->phent); 1387 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum); 1388 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz); 1389 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags); 1390 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry); 1391 AUXARGS_ENTRY(pos, AT_BASE, args->base); 1392 AUXARGS_ENTRY(pos, AT_EHDRFLAGS, args->hdr_eflags); 1393 if (imgp->execpathp != 0) 1394 AUXARGS_ENTRY_PTR(pos, AT_EXECPATH, imgp->execpathp); 1395 AUXARGS_ENTRY(pos, AT_OSRELDATE, 1396 imgp->proc->p_ucred->cr_prison->pr_osreldate); 1397 if (imgp->canary != 0) { 1398 AUXARGS_ENTRY_PTR(pos, AT_CANARY, imgp->canary); 1399 AUXARGS_ENTRY(pos, AT_CANARYLEN, imgp->canarylen); 1400 } 1401 AUXARGS_ENTRY(pos, AT_NCPUS, mp_ncpus); 1402 if (imgp->pagesizes != 0) { 1403 AUXARGS_ENTRY_PTR(pos, AT_PAGESIZES, imgp->pagesizes); 1404 AUXARGS_ENTRY(pos, AT_PAGESIZESLEN, imgp->pagesizeslen); 1405 } 1406 if (imgp->sysent->sv_timekeep_base != 0) { 1407 AUXARGS_ENTRY(pos, AT_TIMEKEEP, 1408 imgp->sysent->sv_timekeep_base); 1409 } 1410 AUXARGS_ENTRY(pos, AT_STACKPROT, imgp->sysent->sv_shared_page_obj 1411 != NULL && imgp->stack_prot != 0 ? imgp->stack_prot : 1412 imgp->sysent->sv_stackprot); 1413 if (imgp->sysent->sv_hwcap != NULL) 1414 AUXARGS_ENTRY(pos, AT_HWCAP, *imgp->sysent->sv_hwcap); 1415 if (imgp->sysent->sv_hwcap2 != NULL) 1416 AUXARGS_ENTRY(pos, AT_HWCAP2, *imgp->sysent->sv_hwcap2); 1417 AUXARGS_ENTRY(pos, AT_BSDFLAGS, __elfN(sigfastblock) ? 1418 ELF_BSDF_SIGFASTBLK : 0); 1419 AUXARGS_ENTRY(pos, AT_ARGC, imgp->args->argc); 1420 AUXARGS_ENTRY_PTR(pos, AT_ARGV, imgp->argv); 1421 AUXARGS_ENTRY(pos, AT_ENVC, imgp->args->envc); 1422 AUXARGS_ENTRY_PTR(pos, AT_ENVV, imgp->envv); 1423 AUXARGS_ENTRY_PTR(pos, AT_PS_STRINGS, imgp->ps_strings); 1424 if (imgp->sysent->sv_fxrng_gen_base != 0) 1425 AUXARGS_ENTRY(pos, AT_FXRNG, imgp->sysent->sv_fxrng_gen_base); 1426 if (imgp->sysent->sv_vdso_base != 0 && __elfN(vdso) != 0) 1427 AUXARGS_ENTRY(pos, AT_KPRELOAD, imgp->sysent->sv_vdso_base); 1428 AUXARGS_ENTRY(pos, AT_NULL, 0); 1429 1430 free(imgp->auxargs, M_TEMP); 1431 imgp->auxargs = NULL; 1432 KASSERT(pos - argarray <= AT_COUNT, ("Too many auxargs")); 1433 1434 error = copyout(argarray, (void *)base, sizeof(*argarray) * AT_COUNT); 1435 free(argarray, M_TEMP); 1436 return (error); 1437 } 1438 1439 int 1440 __elfN(freebsd_fixup)(uintptr_t *stack_base, struct image_params *imgp) 1441 { 1442 Elf_Addr *base; 1443 1444 base = (Elf_Addr *)*stack_base; 1445 base--; 1446 if (elf_suword(base, imgp->args->argc) == -1) 1447 return (EFAULT); 1448 *stack_base = (uintptr_t)base; 1449 return (0); 1450 } 1451 1452 /* 1453 * Code for generating ELF core dumps. 1454 */ 1455 1456 typedef void (*segment_callback)(vm_map_entry_t, void *); 1457 1458 /* Closure for cb_put_phdr(). */ 1459 struct phdr_closure { 1460 Elf_Phdr *phdr; /* Program header to fill in */ 1461 Elf_Off offset; /* Offset of segment in core file */ 1462 }; 1463 1464 struct note_info { 1465 int type; /* Note type. */ 1466 outfunc_t outfunc; /* Output function. */ 1467 void *outarg; /* Argument for the output function. */ 1468 size_t outsize; /* Output size. */ 1469 TAILQ_ENTRY(note_info) link; /* Link to the next note info. */ 1470 }; 1471 1472 TAILQ_HEAD(note_info_list, note_info); 1473 1474 extern int compress_user_cores; 1475 extern int compress_user_cores_level; 1476 1477 static void cb_put_phdr(vm_map_entry_t, void *); 1478 static void cb_size_segment(vm_map_entry_t, void *); 1479 static void each_dumpable_segment(struct thread *, segment_callback, void *, 1480 int); 1481 static int __elfN(corehdr)(struct coredump_params *, int, void *, size_t, 1482 struct note_info_list *, size_t, int); 1483 static void __elfN(putnote)(struct thread *td, struct note_info *, struct sbuf *); 1484 1485 static void __elfN(note_fpregset)(void *, struct sbuf *, size_t *); 1486 static void __elfN(note_prpsinfo)(void *, struct sbuf *, size_t *); 1487 static void __elfN(note_prstatus)(void *, struct sbuf *, size_t *); 1488 static void __elfN(note_threadmd)(void *, struct sbuf *, size_t *); 1489 static void __elfN(note_thrmisc)(void *, struct sbuf *, size_t *); 1490 static void __elfN(note_ptlwpinfo)(void *, struct sbuf *, size_t *); 1491 static void __elfN(note_procstat_auxv)(void *, struct sbuf *, size_t *); 1492 static void __elfN(note_procstat_proc)(void *, struct sbuf *, size_t *); 1493 static void __elfN(note_procstat_psstrings)(void *, struct sbuf *, size_t *); 1494 static void note_procstat_files(void *, struct sbuf *, size_t *); 1495 static void note_procstat_groups(void *, struct sbuf *, size_t *); 1496 static void note_procstat_osrel(void *, struct sbuf *, size_t *); 1497 static void note_procstat_rlimit(void *, struct sbuf *, size_t *); 1498 static void note_procstat_umask(void *, struct sbuf *, size_t *); 1499 static void note_procstat_vmmap(void *, struct sbuf *, size_t *); 1500 1501 static int 1502 core_compressed_write(void *base, size_t len, off_t offset, void *arg) 1503 { 1504 1505 return (core_write((struct coredump_params *)arg, base, len, offset, 1506 UIO_SYSSPACE, NULL)); 1507 } 1508 1509 int 1510 __elfN(coredump)(struct thread *td, struct vnode *vp, off_t limit, int flags) 1511 { 1512 struct ucred *cred = td->td_ucred; 1513 int compm, error = 0; 1514 struct sseg_closure seginfo; 1515 struct note_info_list notelst; 1516 struct coredump_params params; 1517 struct note_info *ninfo; 1518 void *hdr, *tmpbuf; 1519 size_t hdrsize, notesz, coresize; 1520 1521 hdr = NULL; 1522 tmpbuf = NULL; 1523 TAILQ_INIT(¬elst); 1524 1525 /* Size the program segments. */ 1526 __elfN(size_segments)(td, &seginfo, flags); 1527 1528 /* 1529 * Collect info about the core file header area. 1530 */ 1531 hdrsize = sizeof(Elf_Ehdr) + sizeof(Elf_Phdr) * (1 + seginfo.count); 1532 if (seginfo.count + 1 >= PN_XNUM) 1533 hdrsize += sizeof(Elf_Shdr); 1534 td->td_proc->p_sysent->sv_elf_core_prepare_notes(td, ¬elst, ¬esz); 1535 coresize = round_page(hdrsize + notesz) + seginfo.size; 1536 1537 /* Set up core dump parameters. */ 1538 params.offset = 0; 1539 params.active_cred = cred; 1540 params.file_cred = NOCRED; 1541 params.td = td; 1542 params.vp = vp; 1543 params.comp = NULL; 1544 1545 #ifdef RACCT 1546 if (racct_enable) { 1547 PROC_LOCK(td->td_proc); 1548 error = racct_add(td->td_proc, RACCT_CORE, coresize); 1549 PROC_UNLOCK(td->td_proc); 1550 if (error != 0) { 1551 error = EFAULT; 1552 goto done; 1553 } 1554 } 1555 #endif 1556 if (coresize >= limit) { 1557 error = EFAULT; 1558 goto done; 1559 } 1560 1561 /* Create a compression stream if necessary. */ 1562 compm = compress_user_cores; 1563 if ((flags & (SVC_PT_COREDUMP | SVC_NOCOMPRESS)) == SVC_PT_COREDUMP && 1564 compm == 0) 1565 compm = COMPRESS_GZIP; 1566 if (compm != 0) { 1567 params.comp = compressor_init(core_compressed_write, 1568 compm, CORE_BUF_SIZE, 1569 compress_user_cores_level, ¶ms); 1570 if (params.comp == NULL) { 1571 error = EFAULT; 1572 goto done; 1573 } 1574 tmpbuf = malloc(CORE_BUF_SIZE, M_TEMP, M_WAITOK | M_ZERO); 1575 } 1576 1577 /* 1578 * Allocate memory for building the header, fill it up, 1579 * and write it out following the notes. 1580 */ 1581 hdr = malloc(hdrsize, M_TEMP, M_WAITOK); 1582 error = __elfN(corehdr)(¶ms, seginfo.count, hdr, hdrsize, ¬elst, 1583 notesz, flags); 1584 1585 /* Write the contents of all of the writable segments. */ 1586 if (error == 0) { 1587 Elf_Phdr *php; 1588 off_t offset; 1589 int i; 1590 1591 php = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr)) + 1; 1592 offset = round_page(hdrsize + notesz); 1593 for (i = 0; i < seginfo.count; i++) { 1594 error = core_output((char *)(uintptr_t)php->p_vaddr, 1595 php->p_filesz, offset, ¶ms, tmpbuf); 1596 if (error != 0) 1597 break; 1598 offset += php->p_filesz; 1599 php++; 1600 } 1601 if (error == 0 && params.comp != NULL) 1602 error = compressor_flush(params.comp); 1603 } 1604 if (error) { 1605 log(LOG_WARNING, 1606 "Failed to write core file for process %s (error %d)\n", 1607 curproc->p_comm, error); 1608 } 1609 1610 done: 1611 free(tmpbuf, M_TEMP); 1612 if (params.comp != NULL) 1613 compressor_fini(params.comp); 1614 while ((ninfo = TAILQ_FIRST(¬elst)) != NULL) { 1615 TAILQ_REMOVE(¬elst, ninfo, link); 1616 free(ninfo, M_TEMP); 1617 } 1618 if (hdr != NULL) 1619 free(hdr, M_TEMP); 1620 1621 return (error); 1622 } 1623 1624 /* 1625 * A callback for each_dumpable_segment() to write out the segment's 1626 * program header entry. 1627 */ 1628 static void 1629 cb_put_phdr(vm_map_entry_t entry, void *closure) 1630 { 1631 struct phdr_closure *phc = (struct phdr_closure *)closure; 1632 Elf_Phdr *phdr = phc->phdr; 1633 1634 phc->offset = round_page(phc->offset); 1635 1636 phdr->p_type = PT_LOAD; 1637 phdr->p_offset = phc->offset; 1638 phdr->p_vaddr = entry->start; 1639 phdr->p_paddr = 0; 1640 phdr->p_filesz = phdr->p_memsz = entry->end - entry->start; 1641 phdr->p_align = PAGE_SIZE; 1642 phdr->p_flags = __elfN(untrans_prot)(entry->protection); 1643 1644 phc->offset += phdr->p_filesz; 1645 phc->phdr++; 1646 } 1647 1648 /* 1649 * A callback for each_dumpable_segment() to gather information about 1650 * the number of segments and their total size. 1651 */ 1652 static void 1653 cb_size_segment(vm_map_entry_t entry, void *closure) 1654 { 1655 struct sseg_closure *ssc = (struct sseg_closure *)closure; 1656 1657 ssc->count++; 1658 ssc->size += entry->end - entry->start; 1659 } 1660 1661 void 1662 __elfN(size_segments)(struct thread *td, struct sseg_closure *seginfo, 1663 int flags) 1664 { 1665 seginfo->count = 0; 1666 seginfo->size = 0; 1667 1668 each_dumpable_segment(td, cb_size_segment, seginfo, flags); 1669 } 1670 1671 /* 1672 * For each writable segment in the process's memory map, call the given 1673 * function with a pointer to the map entry and some arbitrary 1674 * caller-supplied data. 1675 */ 1676 static void 1677 each_dumpable_segment(struct thread *td, segment_callback func, void *closure, 1678 int flags) 1679 { 1680 struct proc *p = td->td_proc; 1681 vm_map_t map = &p->p_vmspace->vm_map; 1682 vm_map_entry_t entry; 1683 vm_object_t backing_object, object; 1684 bool ignore_entry; 1685 1686 vm_map_lock_read(map); 1687 VM_MAP_ENTRY_FOREACH(entry, map) { 1688 /* 1689 * Don't dump inaccessible mappings, deal with legacy 1690 * coredump mode. 1691 * 1692 * Note that read-only segments related to the elf binary 1693 * are marked MAP_ENTRY_NOCOREDUMP now so we no longer 1694 * need to arbitrarily ignore such segments. 1695 */ 1696 if ((flags & SVC_ALL) == 0) { 1697 if (elf_legacy_coredump) { 1698 if ((entry->protection & VM_PROT_RW) != 1699 VM_PROT_RW) 1700 continue; 1701 } else { 1702 if ((entry->protection & VM_PROT_ALL) == 0) 1703 continue; 1704 } 1705 } 1706 1707 /* 1708 * Dont include memory segment in the coredump if 1709 * MAP_NOCORE is set in mmap(2) or MADV_NOCORE in 1710 * madvise(2). Do not dump submaps (i.e. parts of the 1711 * kernel map). 1712 */ 1713 if ((entry->eflags & MAP_ENTRY_IS_SUB_MAP) != 0) 1714 continue; 1715 if ((entry->eflags & MAP_ENTRY_NOCOREDUMP) != 0 && 1716 (flags & SVC_ALL) == 0) 1717 continue; 1718 if ((object = entry->object.vm_object) == NULL) 1719 continue; 1720 1721 /* Ignore memory-mapped devices and such things. */ 1722 VM_OBJECT_RLOCK(object); 1723 while ((backing_object = object->backing_object) != NULL) { 1724 VM_OBJECT_RLOCK(backing_object); 1725 VM_OBJECT_RUNLOCK(object); 1726 object = backing_object; 1727 } 1728 ignore_entry = (object->flags & OBJ_FICTITIOUS) != 0; 1729 VM_OBJECT_RUNLOCK(object); 1730 if (ignore_entry) 1731 continue; 1732 1733 (*func)(entry, closure); 1734 } 1735 vm_map_unlock_read(map); 1736 } 1737 1738 /* 1739 * Write the core file header to the file, including padding up to 1740 * the page boundary. 1741 */ 1742 static int 1743 __elfN(corehdr)(struct coredump_params *p, int numsegs, void *hdr, 1744 size_t hdrsize, struct note_info_list *notelst, size_t notesz, 1745 int flags) 1746 { 1747 struct note_info *ninfo; 1748 struct sbuf *sb; 1749 int error; 1750 1751 /* Fill in the header. */ 1752 bzero(hdr, hdrsize); 1753 __elfN(puthdr)(p->td, hdr, hdrsize, numsegs, notesz, flags); 1754 1755 sb = sbuf_new(NULL, NULL, CORE_BUF_SIZE, SBUF_FIXEDLEN); 1756 sbuf_set_drain(sb, sbuf_drain_core_output, p); 1757 sbuf_start_section(sb, NULL); 1758 sbuf_bcat(sb, hdr, hdrsize); 1759 TAILQ_FOREACH(ninfo, notelst, link) 1760 __elfN(putnote)(p->td, ninfo, sb); 1761 /* Align up to a page boundary for the program segments. */ 1762 sbuf_end_section(sb, -1, PAGE_SIZE, 0); 1763 error = sbuf_finish(sb); 1764 sbuf_delete(sb); 1765 1766 return (error); 1767 } 1768 1769 void 1770 __elfN(prepare_notes)(struct thread *td, struct note_info_list *list, 1771 size_t *sizep) 1772 { 1773 struct proc *p; 1774 struct thread *thr; 1775 size_t size; 1776 1777 p = td->td_proc; 1778 size = 0; 1779 1780 size += __elfN(register_note)(td, list, NT_PRPSINFO, __elfN(note_prpsinfo), p); 1781 1782 /* 1783 * To have the debugger select the right thread (LWP) as the initial 1784 * thread, we dump the state of the thread passed to us in td first. 1785 * This is the thread that causes the core dump and thus likely to 1786 * be the right thread one wants to have selected in the debugger. 1787 */ 1788 thr = td; 1789 while (thr != NULL) { 1790 size += __elfN(register_note)(td, list, NT_PRSTATUS, 1791 __elfN(note_prstatus), thr); 1792 size += __elfN(register_note)(td, list, NT_FPREGSET, 1793 __elfN(note_fpregset), thr); 1794 size += __elfN(register_note)(td, list, NT_THRMISC, 1795 __elfN(note_thrmisc), thr); 1796 size += __elfN(register_note)(td, list, NT_PTLWPINFO, 1797 __elfN(note_ptlwpinfo), thr); 1798 size += __elfN(register_note)(td, list, -1, 1799 __elfN(note_threadmd), thr); 1800 1801 thr = thr == td ? TAILQ_FIRST(&p->p_threads) : 1802 TAILQ_NEXT(thr, td_plist); 1803 if (thr == td) 1804 thr = TAILQ_NEXT(thr, td_plist); 1805 } 1806 1807 size += __elfN(register_note)(td, list, NT_PROCSTAT_PROC, 1808 __elfN(note_procstat_proc), p); 1809 size += __elfN(register_note)(td, list, NT_PROCSTAT_FILES, 1810 note_procstat_files, p); 1811 size += __elfN(register_note)(td, list, NT_PROCSTAT_VMMAP, 1812 note_procstat_vmmap, p); 1813 size += __elfN(register_note)(td, list, NT_PROCSTAT_GROUPS, 1814 note_procstat_groups, p); 1815 size += __elfN(register_note)(td, list, NT_PROCSTAT_UMASK, 1816 note_procstat_umask, p); 1817 size += __elfN(register_note)(td, list, NT_PROCSTAT_RLIMIT, 1818 note_procstat_rlimit, p); 1819 size += __elfN(register_note)(td, list, NT_PROCSTAT_OSREL, 1820 note_procstat_osrel, p); 1821 size += __elfN(register_note)(td, list, NT_PROCSTAT_PSSTRINGS, 1822 __elfN(note_procstat_psstrings), p); 1823 size += __elfN(register_note)(td, list, NT_PROCSTAT_AUXV, 1824 __elfN(note_procstat_auxv), p); 1825 1826 *sizep = size; 1827 } 1828 1829 void 1830 __elfN(puthdr)(struct thread *td, void *hdr, size_t hdrsize, int numsegs, 1831 size_t notesz, int flags) 1832 { 1833 Elf_Ehdr *ehdr; 1834 Elf_Phdr *phdr; 1835 Elf_Shdr *shdr; 1836 struct phdr_closure phc; 1837 Elf_Brandinfo *bi; 1838 1839 ehdr = (Elf_Ehdr *)hdr; 1840 bi = td->td_proc->p_elf_brandinfo; 1841 1842 ehdr->e_ident[EI_MAG0] = ELFMAG0; 1843 ehdr->e_ident[EI_MAG1] = ELFMAG1; 1844 ehdr->e_ident[EI_MAG2] = ELFMAG2; 1845 ehdr->e_ident[EI_MAG3] = ELFMAG3; 1846 ehdr->e_ident[EI_CLASS] = ELF_CLASS; 1847 ehdr->e_ident[EI_DATA] = ELF_DATA; 1848 ehdr->e_ident[EI_VERSION] = EV_CURRENT; 1849 ehdr->e_ident[EI_OSABI] = td->td_proc->p_sysent->sv_elf_core_osabi; 1850 ehdr->e_ident[EI_ABIVERSION] = 0; 1851 ehdr->e_ident[EI_PAD] = 0; 1852 ehdr->e_type = ET_CORE; 1853 ehdr->e_machine = bi->machine; 1854 ehdr->e_version = EV_CURRENT; 1855 ehdr->e_entry = 0; 1856 ehdr->e_phoff = sizeof(Elf_Ehdr); 1857 ehdr->e_flags = td->td_proc->p_elf_flags; 1858 ehdr->e_ehsize = sizeof(Elf_Ehdr); 1859 ehdr->e_phentsize = sizeof(Elf_Phdr); 1860 ehdr->e_shentsize = sizeof(Elf_Shdr); 1861 ehdr->e_shstrndx = SHN_UNDEF; 1862 if (numsegs + 1 < PN_XNUM) { 1863 ehdr->e_phnum = numsegs + 1; 1864 ehdr->e_shnum = 0; 1865 } else { 1866 ehdr->e_phnum = PN_XNUM; 1867 ehdr->e_shnum = 1; 1868 1869 ehdr->e_shoff = ehdr->e_phoff + 1870 (numsegs + 1) * ehdr->e_phentsize; 1871 KASSERT(ehdr->e_shoff == hdrsize - sizeof(Elf_Shdr), 1872 ("e_shoff: %zu, hdrsize - shdr: %zu", 1873 (size_t)ehdr->e_shoff, hdrsize - sizeof(Elf_Shdr))); 1874 1875 shdr = (Elf_Shdr *)((char *)hdr + ehdr->e_shoff); 1876 memset(shdr, 0, sizeof(*shdr)); 1877 /* 1878 * A special first section is used to hold large segment and 1879 * section counts. This was proposed by Sun Microsystems in 1880 * Solaris and has been adopted by Linux; the standard ELF 1881 * tools are already familiar with the technique. 1882 * 1883 * See table 7-7 of the Solaris "Linker and Libraries Guide" 1884 * (or 12-7 depending on the version of the document) for more 1885 * details. 1886 */ 1887 shdr->sh_type = SHT_NULL; 1888 shdr->sh_size = ehdr->e_shnum; 1889 shdr->sh_link = ehdr->e_shstrndx; 1890 shdr->sh_info = numsegs + 1; 1891 } 1892 1893 /* 1894 * Fill in the program header entries. 1895 */ 1896 phdr = (Elf_Phdr *)((char *)hdr + ehdr->e_phoff); 1897 1898 /* The note segement. */ 1899 phdr->p_type = PT_NOTE; 1900 phdr->p_offset = hdrsize; 1901 phdr->p_vaddr = 0; 1902 phdr->p_paddr = 0; 1903 phdr->p_filesz = notesz; 1904 phdr->p_memsz = 0; 1905 phdr->p_flags = PF_R; 1906 phdr->p_align = ELF_NOTE_ROUNDSIZE; 1907 phdr++; 1908 1909 /* All the writable segments from the program. */ 1910 phc.phdr = phdr; 1911 phc.offset = round_page(hdrsize + notesz); 1912 each_dumpable_segment(td, cb_put_phdr, &phc, flags); 1913 } 1914 1915 size_t 1916 __elfN(register_note)(struct thread *td, struct note_info_list *list, 1917 int type, outfunc_t out, void *arg) 1918 { 1919 const struct sysentvec *sv; 1920 struct note_info *ninfo; 1921 size_t size, notesize; 1922 1923 sv = td->td_proc->p_sysent; 1924 size = 0; 1925 out(arg, NULL, &size); 1926 ninfo = malloc(sizeof(*ninfo), M_TEMP, M_ZERO | M_WAITOK); 1927 ninfo->type = type; 1928 ninfo->outfunc = out; 1929 ninfo->outarg = arg; 1930 ninfo->outsize = size; 1931 TAILQ_INSERT_TAIL(list, ninfo, link); 1932 1933 if (type == -1) 1934 return (size); 1935 1936 notesize = sizeof(Elf_Note) + /* note header */ 1937 roundup2(strlen(sv->sv_elf_core_abi_vendor) + 1, ELF_NOTE_ROUNDSIZE) + 1938 /* note name */ 1939 roundup2(size, ELF_NOTE_ROUNDSIZE); /* note description */ 1940 1941 return (notesize); 1942 } 1943 1944 static size_t 1945 append_note_data(const void *src, void *dst, size_t len) 1946 { 1947 size_t padded_len; 1948 1949 padded_len = roundup2(len, ELF_NOTE_ROUNDSIZE); 1950 if (dst != NULL) { 1951 bcopy(src, dst, len); 1952 bzero((char *)dst + len, padded_len - len); 1953 } 1954 return (padded_len); 1955 } 1956 1957 size_t 1958 __elfN(populate_note)(int type, void *src, void *dst, size_t size, void **descp) 1959 { 1960 Elf_Note *note; 1961 char *buf; 1962 size_t notesize; 1963 1964 buf = dst; 1965 if (buf != NULL) { 1966 note = (Elf_Note *)buf; 1967 note->n_namesz = sizeof(FREEBSD_ABI_VENDOR); 1968 note->n_descsz = size; 1969 note->n_type = type; 1970 buf += sizeof(*note); 1971 buf += append_note_data(FREEBSD_ABI_VENDOR, buf, 1972 sizeof(FREEBSD_ABI_VENDOR)); 1973 append_note_data(src, buf, size); 1974 if (descp != NULL) 1975 *descp = buf; 1976 } 1977 1978 notesize = sizeof(Elf_Note) + /* note header */ 1979 roundup2(sizeof(FREEBSD_ABI_VENDOR), ELF_NOTE_ROUNDSIZE) + 1980 /* note name */ 1981 roundup2(size, ELF_NOTE_ROUNDSIZE); /* note description */ 1982 1983 return (notesize); 1984 } 1985 1986 static void 1987 __elfN(putnote)(struct thread *td, struct note_info *ninfo, struct sbuf *sb) 1988 { 1989 Elf_Note note; 1990 const struct sysentvec *sv; 1991 ssize_t old_len, sect_len; 1992 size_t new_len, descsz, i; 1993 1994 if (ninfo->type == -1) { 1995 ninfo->outfunc(ninfo->outarg, sb, &ninfo->outsize); 1996 return; 1997 } 1998 1999 sv = td->td_proc->p_sysent; 2000 2001 note.n_namesz = strlen(sv->sv_elf_core_abi_vendor) + 1; 2002 note.n_descsz = ninfo->outsize; 2003 note.n_type = ninfo->type; 2004 2005 sbuf_bcat(sb, ¬e, sizeof(note)); 2006 sbuf_start_section(sb, &old_len); 2007 sbuf_bcat(sb, sv->sv_elf_core_abi_vendor, 2008 strlen(sv->sv_elf_core_abi_vendor) + 1); 2009 sbuf_end_section(sb, old_len, ELF_NOTE_ROUNDSIZE, 0); 2010 if (note.n_descsz == 0) 2011 return; 2012 sbuf_start_section(sb, &old_len); 2013 ninfo->outfunc(ninfo->outarg, sb, &ninfo->outsize); 2014 sect_len = sbuf_end_section(sb, old_len, ELF_NOTE_ROUNDSIZE, 0); 2015 if (sect_len < 0) 2016 return; 2017 2018 new_len = (size_t)sect_len; 2019 descsz = roundup(note.n_descsz, ELF_NOTE_ROUNDSIZE); 2020 if (new_len < descsz) { 2021 /* 2022 * It is expected that individual note emitters will correctly 2023 * predict their expected output size and fill up to that size 2024 * themselves, padding in a format-specific way if needed. 2025 * However, in case they don't, just do it here with zeros. 2026 */ 2027 for (i = 0; i < descsz - new_len; i++) 2028 sbuf_putc(sb, 0); 2029 } else if (new_len > descsz) { 2030 /* 2031 * We can't always truncate sb -- we may have drained some 2032 * of it already. 2033 */ 2034 KASSERT(new_len == descsz, ("%s: Note type %u changed as we " 2035 "read it (%zu > %zu). Since it is longer than " 2036 "expected, this coredump's notes are corrupt. THIS " 2037 "IS A BUG in the note_procstat routine for type %u.\n", 2038 __func__, (unsigned)note.n_type, new_len, descsz, 2039 (unsigned)note.n_type)); 2040 } 2041 } 2042 2043 /* 2044 * Miscellaneous note out functions. 2045 */ 2046 2047 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 2048 #include <compat/freebsd32/freebsd32.h> 2049 #include <compat/freebsd32/freebsd32_signal.h> 2050 2051 typedef struct prstatus32 elf_prstatus_t; 2052 typedef struct prpsinfo32 elf_prpsinfo_t; 2053 typedef struct fpreg32 elf_prfpregset_t; 2054 typedef struct fpreg32 elf_fpregset_t; 2055 typedef struct reg32 elf_gregset_t; 2056 typedef struct thrmisc32 elf_thrmisc_t; 2057 #define ELF_KERN_PROC_MASK KERN_PROC_MASK32 2058 typedef struct kinfo_proc32 elf_kinfo_proc_t; 2059 typedef uint32_t elf_ps_strings_t; 2060 #else 2061 typedef prstatus_t elf_prstatus_t; 2062 typedef prpsinfo_t elf_prpsinfo_t; 2063 typedef prfpregset_t elf_prfpregset_t; 2064 typedef prfpregset_t elf_fpregset_t; 2065 typedef gregset_t elf_gregset_t; 2066 typedef thrmisc_t elf_thrmisc_t; 2067 #define ELF_KERN_PROC_MASK 0 2068 typedef struct kinfo_proc elf_kinfo_proc_t; 2069 typedef vm_offset_t elf_ps_strings_t; 2070 #endif 2071 2072 static void 2073 __elfN(note_prpsinfo)(void *arg, struct sbuf *sb, size_t *sizep) 2074 { 2075 struct sbuf sbarg; 2076 size_t len; 2077 char *cp, *end; 2078 struct proc *p; 2079 elf_prpsinfo_t *psinfo; 2080 int error; 2081 2082 p = arg; 2083 if (sb != NULL) { 2084 KASSERT(*sizep == sizeof(*psinfo), ("invalid size")); 2085 psinfo = malloc(sizeof(*psinfo), M_TEMP, M_ZERO | M_WAITOK); 2086 psinfo->pr_version = PRPSINFO_VERSION; 2087 psinfo->pr_psinfosz = sizeof(elf_prpsinfo_t); 2088 strlcpy(psinfo->pr_fname, p->p_comm, sizeof(psinfo->pr_fname)); 2089 PROC_LOCK(p); 2090 if (p->p_args != NULL) { 2091 len = sizeof(psinfo->pr_psargs) - 1; 2092 if (len > p->p_args->ar_length) 2093 len = p->p_args->ar_length; 2094 memcpy(psinfo->pr_psargs, p->p_args->ar_args, len); 2095 PROC_UNLOCK(p); 2096 error = 0; 2097 } else { 2098 _PHOLD(p); 2099 PROC_UNLOCK(p); 2100 sbuf_new(&sbarg, psinfo->pr_psargs, 2101 sizeof(psinfo->pr_psargs), SBUF_FIXEDLEN); 2102 error = proc_getargv(curthread, p, &sbarg); 2103 PRELE(p); 2104 if (sbuf_finish(&sbarg) == 0) 2105 len = sbuf_len(&sbarg) - 1; 2106 else 2107 len = sizeof(psinfo->pr_psargs) - 1; 2108 sbuf_delete(&sbarg); 2109 } 2110 if (error || len == 0) 2111 strlcpy(psinfo->pr_psargs, p->p_comm, 2112 sizeof(psinfo->pr_psargs)); 2113 else { 2114 KASSERT(len < sizeof(psinfo->pr_psargs), 2115 ("len is too long: %zu vs %zu", len, 2116 sizeof(psinfo->pr_psargs))); 2117 cp = psinfo->pr_psargs; 2118 end = cp + len - 1; 2119 for (;;) { 2120 cp = memchr(cp, '\0', end - cp); 2121 if (cp == NULL) 2122 break; 2123 *cp = ' '; 2124 } 2125 } 2126 psinfo->pr_pid = p->p_pid; 2127 sbuf_bcat(sb, psinfo, sizeof(*psinfo)); 2128 free(psinfo, M_TEMP); 2129 } 2130 *sizep = sizeof(*psinfo); 2131 } 2132 2133 static void 2134 __elfN(note_prstatus)(void *arg, struct sbuf *sb, size_t *sizep) 2135 { 2136 struct thread *td; 2137 elf_prstatus_t *status; 2138 2139 td = arg; 2140 if (sb != NULL) { 2141 KASSERT(*sizep == sizeof(*status), ("invalid size")); 2142 status = malloc(sizeof(*status), M_TEMP, M_ZERO | M_WAITOK); 2143 status->pr_version = PRSTATUS_VERSION; 2144 status->pr_statussz = sizeof(elf_prstatus_t); 2145 status->pr_gregsetsz = sizeof(elf_gregset_t); 2146 status->pr_fpregsetsz = sizeof(elf_fpregset_t); 2147 status->pr_osreldate = osreldate; 2148 status->pr_cursig = td->td_proc->p_sig; 2149 status->pr_pid = td->td_tid; 2150 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 2151 fill_regs32(td, &status->pr_reg); 2152 #else 2153 fill_regs(td, &status->pr_reg); 2154 #endif 2155 sbuf_bcat(sb, status, sizeof(*status)); 2156 free(status, M_TEMP); 2157 } 2158 *sizep = sizeof(*status); 2159 } 2160 2161 static void 2162 __elfN(note_fpregset)(void *arg, struct sbuf *sb, size_t *sizep) 2163 { 2164 struct thread *td; 2165 elf_prfpregset_t *fpregset; 2166 2167 td = arg; 2168 if (sb != NULL) { 2169 KASSERT(*sizep == sizeof(*fpregset), ("invalid size")); 2170 fpregset = malloc(sizeof(*fpregset), M_TEMP, M_ZERO | M_WAITOK); 2171 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 2172 fill_fpregs32(td, fpregset); 2173 #else 2174 fill_fpregs(td, fpregset); 2175 #endif 2176 sbuf_bcat(sb, fpregset, sizeof(*fpregset)); 2177 free(fpregset, M_TEMP); 2178 } 2179 *sizep = sizeof(*fpregset); 2180 } 2181 2182 static void 2183 __elfN(note_thrmisc)(void *arg, struct sbuf *sb, size_t *sizep) 2184 { 2185 struct thread *td; 2186 elf_thrmisc_t thrmisc; 2187 2188 td = arg; 2189 if (sb != NULL) { 2190 KASSERT(*sizep == sizeof(thrmisc), ("invalid size")); 2191 bzero(&thrmisc, sizeof(thrmisc)); 2192 strcpy(thrmisc.pr_tname, td->td_name); 2193 sbuf_bcat(sb, &thrmisc, sizeof(thrmisc)); 2194 } 2195 *sizep = sizeof(thrmisc); 2196 } 2197 2198 static void 2199 __elfN(note_ptlwpinfo)(void *arg, struct sbuf *sb, size_t *sizep) 2200 { 2201 struct thread *td; 2202 size_t size; 2203 int structsize; 2204 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 2205 struct ptrace_lwpinfo32 pl; 2206 #else 2207 struct ptrace_lwpinfo pl; 2208 #endif 2209 2210 td = arg; 2211 size = sizeof(structsize) + sizeof(pl); 2212 if (sb != NULL) { 2213 KASSERT(*sizep == size, ("invalid size")); 2214 structsize = sizeof(pl); 2215 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2216 bzero(&pl, sizeof(pl)); 2217 pl.pl_lwpid = td->td_tid; 2218 pl.pl_event = PL_EVENT_NONE; 2219 pl.pl_sigmask = td->td_sigmask; 2220 pl.pl_siglist = td->td_siglist; 2221 if (td->td_si.si_signo != 0) { 2222 pl.pl_event = PL_EVENT_SIGNAL; 2223 pl.pl_flags |= PL_FLAG_SI; 2224 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 2225 siginfo_to_siginfo32(&td->td_si, &pl.pl_siginfo); 2226 #else 2227 pl.pl_siginfo = td->td_si; 2228 #endif 2229 } 2230 strcpy(pl.pl_tdname, td->td_name); 2231 /* XXX TODO: supply more information in struct ptrace_lwpinfo*/ 2232 sbuf_bcat(sb, &pl, sizeof(pl)); 2233 } 2234 *sizep = size; 2235 } 2236 2237 /* 2238 * Allow for MD specific notes, as well as any MD 2239 * specific preparations for writing MI notes. 2240 */ 2241 static void 2242 __elfN(note_threadmd)(void *arg, struct sbuf *sb, size_t *sizep) 2243 { 2244 struct thread *td; 2245 void *buf; 2246 size_t size; 2247 2248 td = (struct thread *)arg; 2249 size = *sizep; 2250 if (size != 0 && sb != NULL) 2251 buf = malloc(size, M_TEMP, M_ZERO | M_WAITOK); 2252 else 2253 buf = NULL; 2254 size = 0; 2255 __elfN(dump_thread)(td, buf, &size); 2256 KASSERT(sb == NULL || *sizep == size, ("invalid size")); 2257 if (size != 0 && sb != NULL) 2258 sbuf_bcat(sb, buf, size); 2259 free(buf, M_TEMP); 2260 *sizep = size; 2261 } 2262 2263 #ifdef KINFO_PROC_SIZE 2264 CTASSERT(sizeof(struct kinfo_proc) == KINFO_PROC_SIZE); 2265 #endif 2266 2267 static void 2268 __elfN(note_procstat_proc)(void *arg, struct sbuf *sb, size_t *sizep) 2269 { 2270 struct proc *p; 2271 size_t size; 2272 int structsize; 2273 2274 p = arg; 2275 size = sizeof(structsize) + p->p_numthreads * 2276 sizeof(elf_kinfo_proc_t); 2277 2278 if (sb != NULL) { 2279 KASSERT(*sizep == size, ("invalid size")); 2280 structsize = sizeof(elf_kinfo_proc_t); 2281 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2282 sx_slock(&proctree_lock); 2283 PROC_LOCK(p); 2284 kern_proc_out(p, sb, ELF_KERN_PROC_MASK); 2285 sx_sunlock(&proctree_lock); 2286 } 2287 *sizep = size; 2288 } 2289 2290 #ifdef KINFO_FILE_SIZE 2291 CTASSERT(sizeof(struct kinfo_file) == KINFO_FILE_SIZE); 2292 #endif 2293 2294 static void 2295 note_procstat_files(void *arg, struct sbuf *sb, size_t *sizep) 2296 { 2297 struct proc *p; 2298 size_t size, sect_sz, i; 2299 ssize_t start_len, sect_len; 2300 int structsize, filedesc_flags; 2301 2302 if (coredump_pack_fileinfo) 2303 filedesc_flags = KERN_FILEDESC_PACK_KINFO; 2304 else 2305 filedesc_flags = 0; 2306 2307 p = arg; 2308 structsize = sizeof(struct kinfo_file); 2309 if (sb == NULL) { 2310 size = 0; 2311 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN); 2312 sbuf_set_drain(sb, sbuf_count_drain, &size); 2313 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2314 PROC_LOCK(p); 2315 kern_proc_filedesc_out(p, sb, -1, filedesc_flags); 2316 sbuf_finish(sb); 2317 sbuf_delete(sb); 2318 *sizep = size; 2319 } else { 2320 sbuf_start_section(sb, &start_len); 2321 2322 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2323 PROC_LOCK(p); 2324 kern_proc_filedesc_out(p, sb, *sizep - sizeof(structsize), 2325 filedesc_flags); 2326 2327 sect_len = sbuf_end_section(sb, start_len, 0, 0); 2328 if (sect_len < 0) 2329 return; 2330 sect_sz = sect_len; 2331 2332 KASSERT(sect_sz <= *sizep, 2333 ("kern_proc_filedesc_out did not respect maxlen; " 2334 "requested %zu, got %zu", *sizep - sizeof(structsize), 2335 sect_sz - sizeof(structsize))); 2336 2337 for (i = 0; i < *sizep - sect_sz && sb->s_error == 0; i++) 2338 sbuf_putc(sb, 0); 2339 } 2340 } 2341 2342 #ifdef KINFO_VMENTRY_SIZE 2343 CTASSERT(sizeof(struct kinfo_vmentry) == KINFO_VMENTRY_SIZE); 2344 #endif 2345 2346 static void 2347 note_procstat_vmmap(void *arg, struct sbuf *sb, size_t *sizep) 2348 { 2349 struct proc *p; 2350 size_t size; 2351 int structsize, vmmap_flags; 2352 2353 if (coredump_pack_vmmapinfo) 2354 vmmap_flags = KERN_VMMAP_PACK_KINFO; 2355 else 2356 vmmap_flags = 0; 2357 2358 p = arg; 2359 structsize = sizeof(struct kinfo_vmentry); 2360 if (sb == NULL) { 2361 size = 0; 2362 sb = sbuf_new(NULL, NULL, 128, SBUF_FIXEDLEN); 2363 sbuf_set_drain(sb, sbuf_count_drain, &size); 2364 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2365 PROC_LOCK(p); 2366 kern_proc_vmmap_out(p, sb, -1, vmmap_flags); 2367 sbuf_finish(sb); 2368 sbuf_delete(sb); 2369 *sizep = size; 2370 } else { 2371 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2372 PROC_LOCK(p); 2373 kern_proc_vmmap_out(p, sb, *sizep - sizeof(structsize), 2374 vmmap_flags); 2375 } 2376 } 2377 2378 static void 2379 note_procstat_groups(void *arg, struct sbuf *sb, size_t *sizep) 2380 { 2381 struct proc *p; 2382 size_t size; 2383 int structsize; 2384 2385 p = arg; 2386 size = sizeof(structsize) + p->p_ucred->cr_ngroups * sizeof(gid_t); 2387 if (sb != NULL) { 2388 KASSERT(*sizep == size, ("invalid size")); 2389 structsize = sizeof(gid_t); 2390 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2391 sbuf_bcat(sb, p->p_ucred->cr_groups, p->p_ucred->cr_ngroups * 2392 sizeof(gid_t)); 2393 } 2394 *sizep = size; 2395 } 2396 2397 static void 2398 note_procstat_umask(void *arg, struct sbuf *sb, size_t *sizep) 2399 { 2400 struct proc *p; 2401 size_t size; 2402 int structsize; 2403 2404 p = arg; 2405 size = sizeof(structsize) + sizeof(p->p_pd->pd_cmask); 2406 if (sb != NULL) { 2407 KASSERT(*sizep == size, ("invalid size")); 2408 structsize = sizeof(p->p_pd->pd_cmask); 2409 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2410 sbuf_bcat(sb, &p->p_pd->pd_cmask, sizeof(p->p_pd->pd_cmask)); 2411 } 2412 *sizep = size; 2413 } 2414 2415 static void 2416 note_procstat_rlimit(void *arg, struct sbuf *sb, size_t *sizep) 2417 { 2418 struct proc *p; 2419 struct rlimit rlim[RLIM_NLIMITS]; 2420 size_t size; 2421 int structsize, i; 2422 2423 p = arg; 2424 size = sizeof(structsize) + sizeof(rlim); 2425 if (sb != NULL) { 2426 KASSERT(*sizep == size, ("invalid size")); 2427 structsize = sizeof(rlim); 2428 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2429 PROC_LOCK(p); 2430 for (i = 0; i < RLIM_NLIMITS; i++) 2431 lim_rlimit_proc(p, i, &rlim[i]); 2432 PROC_UNLOCK(p); 2433 sbuf_bcat(sb, rlim, sizeof(rlim)); 2434 } 2435 *sizep = size; 2436 } 2437 2438 static void 2439 note_procstat_osrel(void *arg, struct sbuf *sb, size_t *sizep) 2440 { 2441 struct proc *p; 2442 size_t size; 2443 int structsize; 2444 2445 p = arg; 2446 size = sizeof(structsize) + sizeof(p->p_osrel); 2447 if (sb != NULL) { 2448 KASSERT(*sizep == size, ("invalid size")); 2449 structsize = sizeof(p->p_osrel); 2450 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2451 sbuf_bcat(sb, &p->p_osrel, sizeof(p->p_osrel)); 2452 } 2453 *sizep = size; 2454 } 2455 2456 static void 2457 __elfN(note_procstat_psstrings)(void *arg, struct sbuf *sb, size_t *sizep) 2458 { 2459 struct proc *p; 2460 elf_ps_strings_t ps_strings; 2461 size_t size; 2462 int structsize; 2463 2464 p = arg; 2465 size = sizeof(structsize) + sizeof(ps_strings); 2466 if (sb != NULL) { 2467 KASSERT(*sizep == size, ("invalid size")); 2468 structsize = sizeof(ps_strings); 2469 #if defined(COMPAT_FREEBSD32) && __ELF_WORD_SIZE == 32 2470 ps_strings = PTROUT(p->p_sysent->sv_psstrings); 2471 #else 2472 ps_strings = p->p_sysent->sv_psstrings; 2473 #endif 2474 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2475 sbuf_bcat(sb, &ps_strings, sizeof(ps_strings)); 2476 } 2477 *sizep = size; 2478 } 2479 2480 static void 2481 __elfN(note_procstat_auxv)(void *arg, struct sbuf *sb, size_t *sizep) 2482 { 2483 struct proc *p; 2484 size_t size; 2485 int structsize; 2486 2487 p = arg; 2488 if (sb == NULL) { 2489 size = 0; 2490 sb = sbuf_new(NULL, NULL, AT_COUNT * sizeof(Elf_Auxinfo), 2491 SBUF_FIXEDLEN); 2492 sbuf_set_drain(sb, sbuf_count_drain, &size); 2493 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2494 PHOLD(p); 2495 proc_getauxv(curthread, p, sb); 2496 PRELE(p); 2497 sbuf_finish(sb); 2498 sbuf_delete(sb); 2499 *sizep = size; 2500 } else { 2501 structsize = sizeof(Elf_Auxinfo); 2502 sbuf_bcat(sb, &structsize, sizeof(structsize)); 2503 PHOLD(p); 2504 proc_getauxv(curthread, p, sb); 2505 PRELE(p); 2506 } 2507 } 2508 2509 static bool 2510 __elfN(parse_notes)(struct image_params *imgp, Elf_Note *checknote, 2511 const char *note_vendor, const Elf_Phdr *pnote, 2512 bool (*cb)(const Elf_Note *, void *, bool *), void *cb_arg) 2513 { 2514 const Elf_Note *note, *note0, *note_end; 2515 const char *note_name; 2516 char *buf; 2517 int i, error; 2518 bool res; 2519 2520 /* We need some limit, might as well use PAGE_SIZE. */ 2521 if (pnote == NULL || pnote->p_filesz > PAGE_SIZE) 2522 return (false); 2523 ASSERT_VOP_LOCKED(imgp->vp, "parse_notes"); 2524 if (pnote->p_offset > PAGE_SIZE || 2525 pnote->p_filesz > PAGE_SIZE - pnote->p_offset) { 2526 buf = malloc(pnote->p_filesz, M_TEMP, M_NOWAIT); 2527 if (buf == NULL) { 2528 VOP_UNLOCK(imgp->vp); 2529 buf = malloc(pnote->p_filesz, M_TEMP, M_WAITOK); 2530 vn_lock(imgp->vp, LK_SHARED | LK_RETRY); 2531 } 2532 error = vn_rdwr(UIO_READ, imgp->vp, buf, pnote->p_filesz, 2533 pnote->p_offset, UIO_SYSSPACE, IO_NODELOCKED, 2534 curthread->td_ucred, NOCRED, NULL, curthread); 2535 if (error != 0) { 2536 uprintf("i/o error PT_NOTE\n"); 2537 goto retf; 2538 } 2539 note = note0 = (const Elf_Note *)buf; 2540 note_end = (const Elf_Note *)(buf + pnote->p_filesz); 2541 } else { 2542 note = note0 = (const Elf_Note *)(imgp->image_header + 2543 pnote->p_offset); 2544 note_end = (const Elf_Note *)(imgp->image_header + 2545 pnote->p_offset + pnote->p_filesz); 2546 buf = NULL; 2547 } 2548 for (i = 0; i < 100 && note >= note0 && note < note_end; i++) { 2549 if (!aligned(note, Elf32_Addr) || (const char *)note_end - 2550 (const char *)note < sizeof(Elf_Note)) { 2551 goto retf; 2552 } 2553 if (note->n_namesz != checknote->n_namesz || 2554 note->n_descsz != checknote->n_descsz || 2555 note->n_type != checknote->n_type) 2556 goto nextnote; 2557 note_name = (const char *)(note + 1); 2558 if (note_name + checknote->n_namesz >= 2559 (const char *)note_end || strncmp(note_vendor, 2560 note_name, checknote->n_namesz) != 0) 2561 goto nextnote; 2562 2563 if (cb(note, cb_arg, &res)) 2564 goto ret; 2565 nextnote: 2566 note = (const Elf_Note *)((const char *)(note + 1) + 2567 roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE) + 2568 roundup2(note->n_descsz, ELF_NOTE_ROUNDSIZE)); 2569 } 2570 retf: 2571 res = false; 2572 ret: 2573 free(buf, M_TEMP); 2574 return (res); 2575 } 2576 2577 struct brandnote_cb_arg { 2578 Elf_Brandnote *brandnote; 2579 int32_t *osrel; 2580 }; 2581 2582 static bool 2583 brandnote_cb(const Elf_Note *note, void *arg0, bool *res) 2584 { 2585 struct brandnote_cb_arg *arg; 2586 2587 arg = arg0; 2588 2589 /* 2590 * Fetch the osreldate for binary from the ELF OSABI-note if 2591 * necessary. 2592 */ 2593 *res = (arg->brandnote->flags & BN_TRANSLATE_OSREL) != 0 && 2594 arg->brandnote->trans_osrel != NULL ? 2595 arg->brandnote->trans_osrel(note, arg->osrel) : true; 2596 2597 return (true); 2598 } 2599 2600 static Elf_Note fctl_note = { 2601 .n_namesz = sizeof(FREEBSD_ABI_VENDOR), 2602 .n_descsz = sizeof(uint32_t), 2603 .n_type = NT_FREEBSD_FEATURE_CTL, 2604 }; 2605 2606 struct fctl_cb_arg { 2607 bool *has_fctl0; 2608 uint32_t *fctl0; 2609 }; 2610 2611 static bool 2612 note_fctl_cb(const Elf_Note *note, void *arg0, bool *res) 2613 { 2614 struct fctl_cb_arg *arg; 2615 const Elf32_Word *desc; 2616 uintptr_t p; 2617 2618 arg = arg0; 2619 p = (uintptr_t)(note + 1); 2620 p += roundup2(note->n_namesz, ELF_NOTE_ROUNDSIZE); 2621 desc = (const Elf32_Word *)p; 2622 *arg->has_fctl0 = true; 2623 *arg->fctl0 = desc[0]; 2624 *res = true; 2625 return (true); 2626 } 2627 2628 /* 2629 * Try to find the appropriate ABI-note section for checknote, fetch 2630 * the osreldate and feature control flags for binary from the ELF 2631 * OSABI-note. Only the first page of the image is searched, the same 2632 * as for headers. 2633 */ 2634 static bool 2635 __elfN(check_note)(struct image_params *imgp, Elf_Brandnote *brandnote, 2636 int32_t *osrel, bool *has_fctl0, uint32_t *fctl0) 2637 { 2638 const Elf_Phdr *phdr; 2639 const Elf_Ehdr *hdr; 2640 struct brandnote_cb_arg b_arg; 2641 struct fctl_cb_arg f_arg; 2642 int i, j; 2643 2644 hdr = (const Elf_Ehdr *)imgp->image_header; 2645 phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff); 2646 b_arg.brandnote = brandnote; 2647 b_arg.osrel = osrel; 2648 f_arg.has_fctl0 = has_fctl0; 2649 f_arg.fctl0 = fctl0; 2650 2651 for (i = 0; i < hdr->e_phnum; i++) { 2652 if (phdr[i].p_type == PT_NOTE && __elfN(parse_notes)(imgp, 2653 &brandnote->hdr, brandnote->vendor, &phdr[i], brandnote_cb, 2654 &b_arg)) { 2655 for (j = 0; j < hdr->e_phnum; j++) { 2656 if (phdr[j].p_type == PT_NOTE && 2657 __elfN(parse_notes)(imgp, &fctl_note, 2658 FREEBSD_ABI_VENDOR, &phdr[j], 2659 note_fctl_cb, &f_arg)) 2660 break; 2661 } 2662 return (true); 2663 } 2664 } 2665 return (false); 2666 2667 } 2668 2669 /* 2670 * Tell kern_execve.c about it, with a little help from the linker. 2671 */ 2672 static struct execsw __elfN(execsw) = { 2673 .ex_imgact = __CONCAT(exec_, __elfN(imgact)), 2674 .ex_name = __XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) 2675 }; 2676 EXEC_SET(__CONCAT(elf, __ELF_WORD_SIZE), __elfN(execsw)); 2677 2678 static vm_prot_t 2679 __elfN(trans_prot)(Elf_Word flags) 2680 { 2681 vm_prot_t prot; 2682 2683 prot = 0; 2684 if (flags & PF_X) 2685 prot |= VM_PROT_EXECUTE; 2686 if (flags & PF_W) 2687 prot |= VM_PROT_WRITE; 2688 if (flags & PF_R) 2689 prot |= VM_PROT_READ; 2690 #if __ELF_WORD_SIZE == 32 && (defined(__amd64__) || defined(__i386__)) 2691 if (i386_read_exec && (flags & PF_R)) 2692 prot |= VM_PROT_EXECUTE; 2693 #endif 2694 return (prot); 2695 } 2696 2697 static Elf_Word 2698 __elfN(untrans_prot)(vm_prot_t prot) 2699 { 2700 Elf_Word flags; 2701 2702 flags = 0; 2703 if (prot & VM_PROT_EXECUTE) 2704 flags |= PF_X; 2705 if (prot & VM_PROT_READ) 2706 flags |= PF_R; 2707 if (prot & VM_PROT_WRITE) 2708 flags |= PF_W; 2709 return (flags); 2710 } 2711 2712 vm_size_t 2713 __elfN(stackgap)(struct image_params *imgp, uintptr_t *stack_base) 2714 { 2715 uintptr_t range, rbase, gap; 2716 int pct; 2717 2718 pct = __elfN(aslr_stack_gap); 2719 if (pct == 0) 2720 return (0); 2721 if (pct > 50) 2722 pct = 50; 2723 range = imgp->eff_stack_sz * pct / 100; 2724 arc4rand(&rbase, sizeof(rbase), 0); 2725 gap = rbase % range; 2726 gap &= ~(sizeof(u_long) - 1); 2727 *stack_base -= gap; 2728 return (gap); 2729 } 2730