1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ 28 /* All Rights Reserved */ 29 30 31 #pragma ident "%Z%%M% %I% %E% SMI" 32 33 #include <sys/types.h> 34 #include <sys/param.h> 35 #include <sys/thread.h> 36 #include <sys/sysmacros.h> 37 #include <sys/signal.h> 38 #include <sys/cred.h> 39 #include <sys/user.h> 40 #include <sys/errno.h> 41 #include <sys/vnode.h> 42 #include <sys/mman.h> 43 #include <sys/kmem.h> 44 #include <sys/proc.h> 45 #include <sys/pathname.h> 46 #include <sys/cmn_err.h> 47 #include <sys/systm.h> 48 #include <sys/elf.h> 49 #include <sys/vmsystm.h> 50 #include <sys/debug.h> 51 #include <sys/auxv.h> 52 #include <sys/exec.h> 53 #include <sys/prsystm.h> 54 #include <vm/as.h> 55 #include <vm/rm.h> 56 #include <vm/seg.h> 57 #include <vm/seg_vn.h> 58 #include <sys/modctl.h> 59 #include <sys/systeminfo.h> 60 #include <sys/vmparam.h> 61 #include <sys/machelf.h> 62 #include <sys/shm_impl.h> 63 #include <sys/archsystm.h> 64 #include <sys/fasttrap.h> 65 #include <sys/brand.h> 66 #include "elf_impl.h" 67 68 #include <sys/sdt.h> 69 70 extern int at_flags; 71 72 #define ORIGIN_STR "ORIGIN" 73 #define ORIGIN_STR_SIZE 6 74 75 static int getelfhead(vnode_t *, cred_t *, Ehdr *, int *, int *, int *); 76 static int getelfphdr(vnode_t *, cred_t *, const Ehdr *, int, caddr_t *, 77 ssize_t *); 78 static int getelfshdr(vnode_t *, cred_t *, const Ehdr *, int, int, caddr_t *, 79 ssize_t *, caddr_t *, ssize_t *); 80 static size_t elfsize(Ehdr *, int, caddr_t, uintptr_t *); 81 static int mapelfexec(vnode_t *, Ehdr *, int, caddr_t, 82 Phdr **, Phdr **, Phdr **, Phdr **, Phdr *, 83 caddr_t *, caddr_t *, intptr_t *, intptr_t *, size_t, long *, size_t *); 84 85 typedef enum { 86 STR_CTF, 87 STR_SYMTAB, 88 STR_DYNSYM, 89 STR_STRTAB, 90 STR_DYNSTR, 91 STR_SHSTRTAB, 92 STR_NUM 93 } shstrtype_t; 94 95 static const char *shstrtab_data[] = { 96 ".SUNW_ctf", 97 ".symtab", 98 ".dynsym", 99 ".strtab", 100 ".dynstr", 101 ".shstrtab" 102 }; 103 104 typedef struct shstrtab { 105 int sst_ndx[STR_NUM]; 106 int sst_cur; 107 } shstrtab_t; 108 109 static void 110 shstrtab_init(shstrtab_t *s) 111 { 112 bzero(&s->sst_ndx, sizeof (s->sst_ndx)); 113 s->sst_cur = 1; 114 } 115 116 static int 117 shstrtab_ndx(shstrtab_t *s, shstrtype_t type) 118 { 119 int ret; 120 121 if ((ret = s->sst_ndx[type]) != 0) 122 return (ret); 123 124 ret = s->sst_ndx[type] = s->sst_cur; 125 s->sst_cur += strlen(shstrtab_data[type]) + 1; 126 127 return (ret); 128 } 129 130 static size_t 131 shstrtab_size(const shstrtab_t *s) 132 { 133 return (s->sst_cur); 134 } 135 136 static void 137 shstrtab_dump(const shstrtab_t *s, char *buf) 138 { 139 int i, ndx; 140 141 *buf = '\0'; 142 for (i = 0; i < STR_NUM; i++) { 143 if ((ndx = s->sst_ndx[i]) != 0) 144 (void) strcpy(buf + ndx, shstrtab_data[i]); 145 } 146 } 147 148 static int 149 dtrace_safe_phdr(Phdr *phdrp, struct uarg *args, uintptr_t base) 150 { 151 ASSERT(phdrp->p_type == PT_SUNWDTRACE); 152 153 /* 154 * See the comment in fasttrap.h for information on how to safely 155 * update this program header. 156 */ 157 if (phdrp->p_memsz < PT_SUNWDTRACE_SIZE || 158 (phdrp->p_flags & (PF_R | PF_W | PF_X)) != (PF_R | PF_W | PF_X)) 159 return (-1); 160 161 args->thrptr = phdrp->p_vaddr + base; 162 163 return (0); 164 } 165 166 /* 167 * Map in the executable pointed to by vp. Returns 0 on success. 168 */ 169 int 170 mapexec_brand(vnode_t *vp, uarg_t *args, Ehdr *ehdr, Elf32_Addr *uphdr_vaddr, 171 intptr_t *voffset, caddr_t exec_file, int *interp, caddr_t *bssbase, 172 caddr_t *brkbase, size_t *brksize) 173 { 174 size_t len; 175 struct vattr vat; 176 caddr_t phdrbase = NULL; 177 ssize_t phdrsize; 178 int nshdrs, shstrndx, nphdrs; 179 int error = 0; 180 Phdr *uphdr = NULL; 181 Phdr *junk = NULL; 182 Phdr *dynphdr = NULL; 183 Phdr *dtrphdr = NULL; 184 uintptr_t lddata; 185 long execsz; 186 intptr_t minaddr; 187 188 if (error = execpermissions(vp, &vat, args)) { 189 uprintf("%s: Cannot execute %s\n", exec_file, args->pathname); 190 return (error); 191 } 192 193 if ((error = getelfhead(vp, CRED(), ehdr, &nshdrs, &shstrndx, 194 &nphdrs)) != 0 || 195 (error = getelfphdr(vp, CRED(), ehdr, nphdrs, &phdrbase, 196 &phdrsize)) != 0) { 197 uprintf("%s: Cannot read %s\n", exec_file, args->pathname); 198 return (error); 199 } 200 201 if ((len = elfsize(ehdr, nphdrs, phdrbase, &lddata)) == 0) { 202 uprintf("%s: Nothing to load in %s", exec_file, args->pathname); 203 kmem_free(phdrbase, phdrsize); 204 return (ENOEXEC); 205 } 206 207 if (error = mapelfexec(vp, ehdr, nphdrs, phdrbase, &uphdr, &dynphdr, 208 &junk, &dtrphdr, NULL, bssbase, brkbase, voffset, &minaddr, 209 len, &execsz, brksize)) { 210 uprintf("%s: Cannot map %s\n", exec_file, args->pathname); 211 kmem_free(phdrbase, phdrsize); 212 return (error); 213 } 214 215 /* 216 * Inform our caller if the executable needs an interpreter. 217 */ 218 *interp = (dynphdr == NULL) ? 0 : 1; 219 220 /* 221 * If this is a statically linked executable, voffset should indicate 222 * the address of the executable itself (it normally holds the address 223 * of the interpreter). 224 */ 225 if (ehdr->e_type == ET_EXEC && *interp == 0) 226 *voffset = minaddr; 227 228 if (uphdr != NULL) { 229 *uphdr_vaddr = uphdr->p_vaddr; 230 } else { 231 *uphdr_vaddr = (Elf32_Addr)-1; 232 } 233 234 kmem_free(phdrbase, phdrsize); 235 return (error); 236 } 237 238 /*ARGSUSED*/ 239 int 240 elfexec(vnode_t *vp, execa_t *uap, uarg_t *args, intpdata_t *idatap, 241 int level, long *execsz, int setid, caddr_t exec_file, cred_t *cred, 242 int brand_action) 243 { 244 caddr_t phdrbase = NULL; 245 caddr_t bssbase = 0; 246 caddr_t brkbase = 0; 247 size_t brksize = 0; 248 ssize_t dlnsize; 249 aux_entry_t *aux; 250 int error; 251 ssize_t resid; 252 int fd = -1; 253 intptr_t voffset; 254 Phdr *dyphdr = NULL; 255 Phdr *stphdr = NULL; 256 Phdr *uphdr = NULL; 257 Phdr *junk = NULL; 258 size_t len; 259 ssize_t phdrsize; 260 int postfixsize = 0; 261 int i, hsize; 262 Phdr *phdrp; 263 Phdr *dataphdrp = NULL; 264 Phdr *dtrphdr; 265 int hasu = 0; 266 int hasauxv = 0; 267 int hasdy = 0; 268 int branded = 0; 269 270 struct proc *p = ttoproc(curthread); 271 struct user *up = PTOU(p); 272 struct bigwad { 273 Ehdr ehdr; 274 aux_entry_t elfargs[__KERN_NAUXV_IMPL]; 275 char dl_name[MAXPATHLEN]; 276 char pathbuf[MAXPATHLEN]; 277 struct vattr vattr; 278 struct execenv exenv; 279 } *bigwad; /* kmem_alloc this behemoth so we don't blow stack */ 280 Ehdr *ehdrp; 281 int nshdrs, shstrndx, nphdrs; 282 char *dlnp; 283 char *pathbufp; 284 rlim64_t limit; 285 rlim64_t roundlimit; 286 287 ASSERT(p->p_model == DATAMODEL_ILP32 || p->p_model == DATAMODEL_LP64); 288 289 if ((level < 2) && 290 (brand_action != EBA_NATIVE) && (PROC_IS_BRANDED(p))) { 291 return (BROP(p)->b_elfexec(vp, uap, args, 292 idatap, level + 1, execsz, setid, exec_file, cred, 293 brand_action)); 294 } 295 296 bigwad = kmem_alloc(sizeof (struct bigwad), KM_SLEEP); 297 ehdrp = &bigwad->ehdr; 298 dlnp = bigwad->dl_name; 299 pathbufp = bigwad->pathbuf; 300 301 /* 302 * Obtain ELF and program header information. 303 */ 304 if ((error = getelfhead(vp, CRED(), ehdrp, &nshdrs, &shstrndx, 305 &nphdrs)) != 0 || 306 (error = getelfphdr(vp, CRED(), ehdrp, nphdrs, &phdrbase, 307 &phdrsize)) != 0) 308 goto out; 309 310 /* 311 * Prevent executing an ELF file that has no entry point. 312 */ 313 if (ehdrp->e_entry == 0) { 314 uprintf("%s: Bad entry point\n", exec_file); 315 goto bad; 316 } 317 318 /* 319 * Put data model that we're exec-ing to into the args passed to 320 * exec_args(), so it will know what it is copying to on new stack. 321 * Now that we know whether we are exec-ing a 32-bit or 64-bit 322 * executable, we can set execsz with the appropriate NCARGS. 323 */ 324 #ifdef _LP64 325 if (ehdrp->e_ident[EI_CLASS] == ELFCLASS32) { 326 args->to_model = DATAMODEL_ILP32; 327 *execsz = btopr(SINCR) + btopr(SSIZE) + btopr(NCARGS32-1); 328 } else { 329 args->to_model = DATAMODEL_LP64; 330 args->stk_prot &= ~PROT_EXEC; 331 #if defined(__i386) || defined(__amd64) 332 args->dat_prot &= ~PROT_EXEC; 333 #endif 334 *execsz = btopr(SINCR) + btopr(SSIZE) + btopr(NCARGS64-1); 335 } 336 #else /* _LP64 */ 337 args->to_model = DATAMODEL_ILP32; 338 *execsz = btopr(SINCR) + btopr(SSIZE) + btopr(NCARGS-1); 339 #endif /* _LP64 */ 340 341 /* 342 * Determine aux size now so that stack can be built 343 * in one shot (except actual copyout of aux image), 344 * determine any non-default stack protections, 345 * and still have this code be machine independent. 346 */ 347 hsize = ehdrp->e_phentsize; 348 phdrp = (Phdr *)phdrbase; 349 for (i = nphdrs; i > 0; i--) { 350 switch (phdrp->p_type) { 351 case PT_INTERP: 352 hasauxv = hasdy = 1; 353 break; 354 case PT_PHDR: 355 hasu = 1; 356 break; 357 case PT_SUNWSTACK: 358 args->stk_prot = PROT_USER; 359 if (phdrp->p_flags & PF_R) 360 args->stk_prot |= PROT_READ; 361 if (phdrp->p_flags & PF_W) 362 args->stk_prot |= PROT_WRITE; 363 if (phdrp->p_flags & PF_X) 364 args->stk_prot |= PROT_EXEC; 365 break; 366 case PT_LOAD: 367 dataphdrp = phdrp; 368 break; 369 } 370 phdrp = (Phdr *)((caddr_t)phdrp + hsize); 371 } 372 373 if (ehdrp->e_type != ET_EXEC) { 374 dataphdrp = NULL; 375 hasauxv = 1; 376 } 377 378 /* Copy BSS permissions to args->dat_prot */ 379 if (dataphdrp != NULL) { 380 args->dat_prot = PROT_USER; 381 if (dataphdrp->p_flags & PF_R) 382 args->dat_prot |= PROT_READ; 383 if (dataphdrp->p_flags & PF_W) 384 args->dat_prot |= PROT_WRITE; 385 if (dataphdrp->p_flags & PF_X) 386 args->dat_prot |= PROT_EXEC; 387 } 388 389 /* 390 * If a auxvector will be required - reserve the space for 391 * it now. This may be increased by exec_args if there are 392 * ISA-specific types (included in __KERN_NAUXV_IMPL). 393 */ 394 if (hasauxv) { 395 /* 396 * If a AUX vector is being built - the base AUX 397 * entries are: 398 * 399 * AT_BASE 400 * AT_FLAGS 401 * AT_PAGESZ 402 * AT_SUN_LDSECURE 403 * AT_SUN_HWCAP 404 * AT_SUN_PLATFORM 405 * AT_SUN_EXECNAME 406 * AT_NULL 407 * 408 * total == 8 409 */ 410 if (hasdy && hasu) { 411 /* 412 * Has PT_INTERP & PT_PHDR - the auxvectors that 413 * will be built are: 414 * 415 * AT_PHDR 416 * AT_PHENT 417 * AT_PHNUM 418 * AT_ENTRY 419 * AT_LDDATA 420 * 421 * total = 5 422 */ 423 args->auxsize = (8 + 5) * sizeof (aux_entry_t); 424 } else if (hasdy) { 425 /* 426 * Has PT_INTERP but no PT_PHDR 427 * 428 * AT_EXECFD 429 * AT_LDDATA 430 * 431 * total = 2 432 */ 433 args->auxsize = (8 + 2) * sizeof (aux_entry_t); 434 } else { 435 args->auxsize = 8 * sizeof (aux_entry_t); 436 } 437 } else 438 args->auxsize = 0; 439 440 /* 441 * If this binary is using an emulator, we need to add an 442 * AT_SUN_EMULATOR aux entry. 443 */ 444 if (args->emulator != NULL) 445 args->auxsize += sizeof (aux_entry_t); 446 447 if ((brand_action != EBA_NATIVE) && (PROC_IS_BRANDED(p))) { 448 branded = 1; 449 /* 450 * We will be adding 2 entries to the aux vector. One for 451 * the branded binary's phdr and one for the brandname. 452 */ 453 args->auxsize += 2 * sizeof (aux_entry_t); 454 } 455 456 aux = bigwad->elfargs; 457 /* 458 * Move args to the user's stack. 459 */ 460 if ((error = exec_args(uap, args, idatap, (void **)&aux)) != 0) { 461 if (error == -1) { 462 error = ENOEXEC; 463 goto bad; 464 } 465 goto out; 466 } 467 /* we're single threaded after this point */ 468 469 /* 470 * If this is an ET_DYN executable (shared object), 471 * determine its memory size so that mapelfexec() can load it. 472 */ 473 if (ehdrp->e_type == ET_DYN) 474 len = elfsize(ehdrp, nphdrs, phdrbase, NULL); 475 else 476 len = 0; 477 478 dtrphdr = NULL; 479 480 if ((error = mapelfexec(vp, ehdrp, nphdrs, phdrbase, &uphdr, &dyphdr, 481 &stphdr, &dtrphdr, dataphdrp, &bssbase, &brkbase, &voffset, NULL, 482 len, execsz, &brksize)) != 0) 483 goto bad; 484 485 if (uphdr != NULL && dyphdr == NULL) 486 goto bad; 487 488 if (dtrphdr != NULL && dtrace_safe_phdr(dtrphdr, args, voffset) != 0) { 489 uprintf("%s: Bad DTrace phdr in %s\n", exec_file, exec_file); 490 goto bad; 491 } 492 493 if (dyphdr != NULL) { 494 size_t len; 495 uintptr_t lddata; 496 char *p; 497 struct vnode *nvp; 498 499 dlnsize = dyphdr->p_filesz; 500 501 if (dlnsize > MAXPATHLEN || dlnsize <= 0) 502 goto bad; 503 504 /* 505 * Read in "interpreter" pathname. 506 */ 507 if ((error = vn_rdwr(UIO_READ, vp, dlnp, dyphdr->p_filesz, 508 (offset_t)dyphdr->p_offset, UIO_SYSSPACE, 0, (rlim64_t)0, 509 CRED(), &resid)) != 0) { 510 uprintf("%s: Cannot obtain interpreter pathname\n", 511 exec_file); 512 goto bad; 513 } 514 515 if (resid != 0 || dlnp[dlnsize - 1] != '\0') 516 goto bad; 517 518 /* 519 * Search for '$ORIGIN' token in interpreter path. 520 * If found, expand it. 521 */ 522 for (p = dlnp; p = strchr(p, '$'); ) { 523 uint_t len, curlen; 524 char *_ptr; 525 526 if (strncmp(++p, ORIGIN_STR, ORIGIN_STR_SIZE)) 527 continue; 528 529 curlen = 0; 530 len = p - dlnp - 1; 531 if (len) { 532 bcopy(dlnp, pathbufp, len); 533 curlen += len; 534 } 535 if (_ptr = strrchr(args->pathname, '/')) { 536 len = _ptr - args->pathname; 537 if ((curlen + len) > MAXPATHLEN) 538 break; 539 540 bcopy(args->pathname, &pathbufp[curlen], len); 541 curlen += len; 542 } else { 543 /* 544 * executable is a basename found in the 545 * current directory. So - just substitue 546 * '.' for ORIGIN. 547 */ 548 pathbufp[curlen] = '.'; 549 curlen++; 550 } 551 p += ORIGIN_STR_SIZE; 552 len = strlen(p); 553 554 if ((curlen + len) > MAXPATHLEN) 555 break; 556 bcopy(p, &pathbufp[curlen], len); 557 curlen += len; 558 pathbufp[curlen++] = '\0'; 559 bcopy(pathbufp, dlnp, curlen); 560 } 561 562 /* 563 * /usr/lib/ld.so.1 is known to be a symlink to /lib/ld.so.1 564 * (and /usr/lib/64/ld.so.1 is a symlink to /lib/64/ld.so.1). 565 * Just in case /usr is not mounted, change it now. 566 */ 567 if (strcmp(dlnp, USR_LIB_RTLD) == 0) 568 dlnp += 4; 569 error = lookupname(dlnp, UIO_SYSSPACE, FOLLOW, NULLVPP, &nvp); 570 if (error && dlnp != bigwad->dl_name) { 571 /* new kernel, old user-level */ 572 error = lookupname(dlnp -= 4, UIO_SYSSPACE, FOLLOW, 573 NULLVPP, &nvp); 574 } 575 if (error) { 576 uprintf("%s: Cannot find %s\n", exec_file, dlnp); 577 goto bad; 578 } 579 580 /* 581 * Setup the "aux" vector. 582 */ 583 if (uphdr) { 584 if (ehdrp->e_type == ET_DYN) { 585 /* don't use the first page */ 586 bigwad->exenv.ex_brkbase = (caddr_t)PAGESIZE; 587 bigwad->exenv.ex_bssbase = (caddr_t)PAGESIZE; 588 } else { 589 bigwad->exenv.ex_bssbase = bssbase; 590 bigwad->exenv.ex_brkbase = brkbase; 591 } 592 bigwad->exenv.ex_brksize = brksize; 593 bigwad->exenv.ex_magic = elfmagic; 594 bigwad->exenv.ex_vp = vp; 595 setexecenv(&bigwad->exenv); 596 597 ADDAUX(aux, AT_PHDR, uphdr->p_vaddr + voffset) 598 ADDAUX(aux, AT_PHENT, ehdrp->e_phentsize) 599 ADDAUX(aux, AT_PHNUM, nphdrs) 600 ADDAUX(aux, AT_ENTRY, ehdrp->e_entry + voffset) 601 } else { 602 if ((error = execopen(&vp, &fd)) != 0) { 603 VN_RELE(nvp); 604 goto bad; 605 } 606 607 ADDAUX(aux, AT_EXECFD, fd) 608 } 609 610 if ((error = execpermissions(nvp, &bigwad->vattr, args)) != 0) { 611 VN_RELE(nvp); 612 uprintf("%s: Cannot execute %s\n", exec_file, dlnp); 613 goto bad; 614 } 615 616 /* 617 * Now obtain the ELF header along with the entire program 618 * header contained in "nvp". 619 */ 620 kmem_free(phdrbase, phdrsize); 621 phdrbase = NULL; 622 if ((error = getelfhead(nvp, CRED(), ehdrp, &nshdrs, 623 &shstrndx, &nphdrs)) != 0 || 624 (error = getelfphdr(nvp, CRED(), ehdrp, nphdrs, &phdrbase, 625 &phdrsize)) != 0) { 626 VN_RELE(nvp); 627 uprintf("%s: Cannot read %s\n", exec_file, dlnp); 628 goto bad; 629 } 630 631 /* 632 * Determine memory size of the "interpreter's" loadable 633 * sections. This size is then used to obtain the virtual 634 * address of a hole, in the user's address space, large 635 * enough to map the "interpreter". 636 */ 637 if ((len = elfsize(ehdrp, nphdrs, phdrbase, &lddata)) == 0) { 638 VN_RELE(nvp); 639 uprintf("%s: Nothing to load in %s\n", exec_file, dlnp); 640 goto bad; 641 } 642 643 dtrphdr = NULL; 644 645 error = mapelfexec(nvp, ehdrp, nphdrs, phdrbase, &junk, &junk, 646 &junk, &dtrphdr, NULL, NULL, NULL, &voffset, NULL, len, 647 execsz, NULL); 648 if (error || junk != NULL) { 649 VN_RELE(nvp); 650 uprintf("%s: Cannot map %s\n", exec_file, dlnp); 651 goto bad; 652 } 653 654 /* 655 * We use the DTrace program header to initialize the 656 * architecture-specific user per-LWP location. The dtrace 657 * fasttrap provider requires ready access to per-LWP scratch 658 * space. We assume that there is only one such program header 659 * in the interpreter. 660 */ 661 if (dtrphdr != NULL && 662 dtrace_safe_phdr(dtrphdr, args, voffset) != 0) { 663 VN_RELE(nvp); 664 uprintf("%s: Bad DTrace phdr in %s\n", exec_file, dlnp); 665 goto bad; 666 } 667 668 VN_RELE(nvp); 669 ADDAUX(aux, AT_SUN_LDDATA, voffset + lddata) 670 } 671 672 if (hasauxv) { 673 int auxf = AF_SUN_HWCAPVERIFY; 674 /* 675 * Note: AT_SUN_PLATFORM was filled in via exec_args() 676 */ 677 ADDAUX(aux, AT_BASE, voffset) 678 ADDAUX(aux, AT_FLAGS, at_flags) 679 ADDAUX(aux, AT_PAGESZ, PAGESIZE) 680 /* 681 * Linker flags. (security) 682 * p_flag not yet set at this time. 683 * We rely on gexec() to provide us with the information. 684 * If the application is set-uid but this is not reflected 685 * in a mismatch between real/effective uids/gids, then 686 * don't treat this as a set-uid exec. So we care about 687 * the EXECSETID_UGIDS flag but not the ...SETID flag. 688 */ 689 setid &= ~EXECSETID_SETID; 690 ADDAUX(aux, AT_SUN_AUXFLAGS, 691 setid ? AF_SUN_SETUGID | auxf : auxf); 692 /* 693 * Hardware capability flag word (performance hints) 694 * Used for choosing faster library routines. 695 * (Potentially different between 32-bit and 64-bit ABIs) 696 */ 697 #if defined(_LP64) 698 if (args->to_model == DATAMODEL_NATIVE) 699 ADDAUX(aux, AT_SUN_HWCAP, auxv_hwcap) 700 else 701 ADDAUX(aux, AT_SUN_HWCAP, auxv_hwcap32) 702 #else 703 ADDAUX(aux, AT_SUN_HWCAP, auxv_hwcap) 704 #endif 705 if (branded) { 706 /* 707 * Reserve space for the brand-private aux vector entry, 708 * and record the user addr of that space. 709 */ 710 args->brand_auxp = (auxv32_t *)((char *)args->stackend + 711 ((char *)&aux->a_type - (char *)bigwad->elfargs)); 712 ADDAUX(aux, AT_SUN_BRAND_PHDR, 0) 713 } 714 715 ADDAUX(aux, AT_NULL, 0) 716 postfixsize = (char *)aux - (char *)bigwad->elfargs; 717 ASSERT(postfixsize == args->auxsize); 718 ASSERT(postfixsize <= __KERN_NAUXV_IMPL * sizeof (aux_entry_t)); 719 } 720 721 /* 722 * For the 64-bit kernel, the limit is big enough that rounding it up 723 * to a page can overflow the 64-bit limit, so we check for btopr() 724 * overflowing here by comparing it with the unrounded limit in pages. 725 * If it hasn't overflowed, compare the exec size with the rounded up 726 * limit in pages. Otherwise, just compare with the unrounded limit. 727 */ 728 limit = btop(p->p_vmem_ctl); 729 roundlimit = btopr(p->p_vmem_ctl); 730 if ((roundlimit > limit && *execsz > roundlimit) || 731 (roundlimit < limit && *execsz > limit)) { 732 mutex_enter(&p->p_lock); 733 (void) rctl_action(rctlproc_legacy[RLIMIT_VMEM], p->p_rctls, p, 734 RCA_SAFE); 735 mutex_exit(&p->p_lock); 736 error = ENOMEM; 737 goto bad; 738 } 739 740 bzero(up->u_auxv, sizeof (up->u_auxv)); 741 if (postfixsize) { 742 int num_auxv; 743 744 /* 745 * Copy the aux vector to the user stack. 746 */ 747 error = execpoststack(args, bigwad->elfargs, postfixsize); 748 if (error) 749 goto bad; 750 751 /* 752 * Copy auxv to the process's user structure for use by /proc. 753 * If this is a branded process, the brand's exec routine will 754 * copy it's private entries to the user structure later. It 755 * relies on the fact that the blank entries are at the end. 756 */ 757 num_auxv = postfixsize / sizeof (aux_entry_t); 758 ASSERT(num_auxv <= sizeof (up->u_auxv) / sizeof (auxv_t)); 759 aux = bigwad->elfargs; 760 for (i = 0; i < num_auxv; i++) { 761 up->u_auxv[i].a_type = aux[i].a_type; 762 up->u_auxv[i].a_un.a_val = (aux_val_t)aux[i].a_un.a_val; 763 } 764 } 765 766 /* 767 * Pass back the starting address so we can set the program counter. 768 */ 769 args->entry = (uintptr_t)(ehdrp->e_entry + voffset); 770 771 if (!uphdr) { 772 if (ehdrp->e_type == ET_DYN) { 773 /* 774 * If we are executing a shared library which doesn't 775 * have a interpreter (probably ld.so.1) then 776 * we don't set the brkbase now. Instead we 777 * delay it's setting until the first call 778 * via grow.c::brk(). This permits ld.so.1 to 779 * initialize brkbase to the tail of the executable it 780 * loads (which is where it needs to be). 781 */ 782 bigwad->exenv.ex_brkbase = (caddr_t)0; 783 bigwad->exenv.ex_bssbase = (caddr_t)0; 784 bigwad->exenv.ex_brksize = 0; 785 } else { 786 bigwad->exenv.ex_brkbase = brkbase; 787 bigwad->exenv.ex_bssbase = bssbase; 788 bigwad->exenv.ex_brksize = brksize; 789 } 790 bigwad->exenv.ex_magic = elfmagic; 791 bigwad->exenv.ex_vp = vp; 792 setexecenv(&bigwad->exenv); 793 } 794 795 ASSERT(error == 0); 796 goto out; 797 798 bad: 799 if (fd != -1) /* did we open the a.out yet */ 800 (void) execclose(fd); 801 802 psignal(p, SIGKILL); 803 804 if (error == 0) 805 error = ENOEXEC; 806 out: 807 if (phdrbase != NULL) 808 kmem_free(phdrbase, phdrsize); 809 kmem_free(bigwad, sizeof (struct bigwad)); 810 return (error); 811 } 812 813 /* 814 * Compute the memory size requirement for the ELF file. 815 */ 816 static size_t 817 elfsize(Ehdr *ehdrp, int nphdrs, caddr_t phdrbase, uintptr_t *lddata) 818 { 819 size_t len; 820 Phdr *phdrp = (Phdr *)phdrbase; 821 int hsize = ehdrp->e_phentsize; 822 int first = 1; 823 int dfirst = 1; /* first data segment */ 824 uintptr_t loaddr = 0; 825 uintptr_t hiaddr = 0; 826 uintptr_t lo, hi; 827 int i; 828 829 for (i = nphdrs; i > 0; i--) { 830 if (phdrp->p_type == PT_LOAD) { 831 lo = phdrp->p_vaddr; 832 hi = lo + phdrp->p_memsz; 833 if (first) { 834 loaddr = lo; 835 hiaddr = hi; 836 first = 0; 837 } else { 838 if (loaddr > lo) 839 loaddr = lo; 840 if (hiaddr < hi) 841 hiaddr = hi; 842 } 843 844 /* 845 * save the address of the first data segment 846 * of a object - used for the AT_SUNW_LDDATA 847 * aux entry. 848 */ 849 if ((lddata != NULL) && dfirst && 850 (phdrp->p_flags & PF_W)) { 851 *lddata = lo; 852 dfirst = 0; 853 } 854 } 855 phdrp = (Phdr *)((caddr_t)phdrp + hsize); 856 } 857 858 len = hiaddr - (loaddr & PAGEMASK); 859 len = roundup(len, PAGESIZE); 860 861 return (len); 862 } 863 864 /* 865 * Read in the ELF header and program header table. 866 * SUSV3 requires: 867 * ENOEXEC File format is not recognized 868 * EINVAL Format recognized but execution not supported 869 */ 870 static int 871 getelfhead(vnode_t *vp, cred_t *credp, Ehdr *ehdr, int *nshdrs, int *shstrndx, 872 int *nphdrs) 873 { 874 int error; 875 ssize_t resid; 876 877 /* 878 * We got here by the first two bytes in ident, 879 * now read the entire ELF header. 880 */ 881 if ((error = vn_rdwr(UIO_READ, vp, (caddr_t)ehdr, 882 sizeof (Ehdr), (offset_t)0, UIO_SYSSPACE, 0, 883 (rlim64_t)0, credp, &resid)) != 0) 884 return (error); 885 886 /* 887 * Since a separate version is compiled for handling 32-bit and 888 * 64-bit ELF executables on a 64-bit kernel, the 64-bit version 889 * doesn't need to be able to deal with 32-bit ELF files. 890 */ 891 if (resid != 0 || 892 ehdr->e_ident[EI_MAG2] != ELFMAG2 || 893 ehdr->e_ident[EI_MAG3] != ELFMAG3) 894 return (ENOEXEC); 895 896 if ((ehdr->e_type != ET_EXEC && ehdr->e_type != ET_DYN) || 897 #if defined(_ILP32) || defined(_ELF32_COMPAT) 898 ehdr->e_ident[EI_CLASS] != ELFCLASS32 || 899 #else 900 ehdr->e_ident[EI_CLASS] != ELFCLASS64 || 901 #endif 902 !elfheadcheck(ehdr->e_ident[EI_DATA], ehdr->e_machine, 903 ehdr->e_flags)) 904 return (EINVAL); 905 906 *nshdrs = ehdr->e_shnum; 907 *shstrndx = ehdr->e_shstrndx; 908 *nphdrs = ehdr->e_phnum; 909 910 /* 911 * If e_shnum, e_shstrndx, or e_phnum is its sentinel value, we need 912 * to read in the section header at index zero to acces the true 913 * values for those fields. 914 */ 915 if ((*nshdrs == 0 && ehdr->e_shoff != 0) || 916 *shstrndx == SHN_XINDEX || *nphdrs == PN_XNUM) { 917 Shdr shdr; 918 919 if (ehdr->e_shoff == 0) 920 return (EINVAL); 921 922 if ((error = vn_rdwr(UIO_READ, vp, (caddr_t)&shdr, 923 sizeof (shdr), (offset_t)ehdr->e_shoff, UIO_SYSSPACE, 0, 924 (rlim64_t)0, credp, &resid)) != 0) 925 return (error); 926 927 if (*nshdrs == 0) 928 *nshdrs = shdr.sh_size; 929 if (*shstrndx == SHN_XINDEX) 930 *shstrndx = shdr.sh_link; 931 if (*nphdrs == PN_XNUM && shdr.sh_info != 0) 932 *nphdrs = shdr.sh_info; 933 } 934 935 return (0); 936 } 937 938 #ifdef _ELF32_COMPAT 939 extern size_t elf_nphdr_max; 940 #else 941 size_t elf_nphdr_max = 1000; 942 #endif 943 944 static int 945 getelfphdr(vnode_t *vp, cred_t *credp, const Ehdr *ehdr, int nphdrs, 946 caddr_t *phbasep, ssize_t *phsizep) 947 { 948 ssize_t resid, minsize; 949 int err; 950 951 /* 952 * Since we're going to be using e_phentsize to iterate down the 953 * array of program headers, it must be 8-byte aligned or else 954 * a we might cause a misaligned access. We use all members through 955 * p_flags on 32-bit ELF files and p_memsz on 64-bit ELF files so 956 * e_phentsize must be at least large enough to include those 957 * members. 958 */ 959 #if !defined(_LP64) || defined(_ELF32_COMPAT) 960 minsize = offsetof(Phdr, p_flags) + sizeof (((Phdr *)NULL)->p_flags); 961 #else 962 minsize = offsetof(Phdr, p_memsz) + sizeof (((Phdr *)NULL)->p_memsz); 963 #endif 964 if (ehdr->e_phentsize < minsize || (ehdr->e_phentsize & 3)) 965 return (EINVAL); 966 967 *phsizep = nphdrs * ehdr->e_phentsize; 968 969 if (*phsizep > sizeof (Phdr) * elf_nphdr_max) { 970 if ((*phbasep = kmem_alloc(*phsizep, KM_NOSLEEP)) == NULL) 971 return (ENOMEM); 972 } else { 973 *phbasep = kmem_alloc(*phsizep, KM_SLEEP); 974 } 975 976 if ((err = vn_rdwr(UIO_READ, vp, *phbasep, *phsizep, 977 (offset_t)ehdr->e_phoff, UIO_SYSSPACE, 0, (rlim64_t)0, 978 credp, &resid)) != 0) { 979 kmem_free(*phbasep, *phsizep); 980 *phbasep = NULL; 981 return (err); 982 } 983 984 return (0); 985 } 986 987 #ifdef _ELF32_COMPAT 988 extern size_t elf_nshdr_max; 989 extern size_t elf_shstrtab_max; 990 #else 991 size_t elf_nshdr_max = 10000; 992 size_t elf_shstrtab_max = 100 * 1024; 993 #endif 994 995 996 static int 997 getelfshdr(vnode_t *vp, cred_t *credp, const Ehdr *ehdr, 998 int nshdrs, int shstrndx, caddr_t *shbasep, ssize_t *shsizep, 999 char **shstrbasep, ssize_t *shstrsizep) 1000 { 1001 ssize_t resid, minsize; 1002 int err; 1003 Shdr *shdr; 1004 1005 /* 1006 * Since we're going to be using e_shentsize to iterate down the 1007 * array of section headers, it must be 8-byte aligned or else 1008 * a we might cause a misaligned access. We use all members through 1009 * sh_entsize (on both 32- and 64-bit ELF files) so e_shentsize 1010 * must be at least large enough to include that member. The index 1011 * of the string table section must also be valid. 1012 */ 1013 minsize = offsetof(Shdr, sh_entsize) + sizeof (shdr->sh_entsize); 1014 if (ehdr->e_shentsize < minsize || (ehdr->e_shentsize & 3) || 1015 shstrndx >= nshdrs) 1016 return (EINVAL); 1017 1018 *shsizep = nshdrs * ehdr->e_shentsize; 1019 1020 if (*shsizep > sizeof (Shdr) * elf_nshdr_max) { 1021 if ((*shbasep = kmem_alloc(*shsizep, KM_NOSLEEP)) == NULL) 1022 return (ENOMEM); 1023 } else { 1024 *shbasep = kmem_alloc(*shsizep, KM_SLEEP); 1025 } 1026 1027 if ((err = vn_rdwr(UIO_READ, vp, *shbasep, *shsizep, 1028 (offset_t)ehdr->e_shoff, UIO_SYSSPACE, 0, (rlim64_t)0, 1029 credp, &resid)) != 0) { 1030 kmem_free(*shbasep, *shsizep); 1031 return (err); 1032 } 1033 1034 /* 1035 * Pull the section string table out of the vnode; fail if the size 1036 * is zero. 1037 */ 1038 shdr = (Shdr *)(*shbasep + shstrndx * ehdr->e_shentsize); 1039 if ((*shstrsizep = shdr->sh_size) == 0) { 1040 kmem_free(*shbasep, *shsizep); 1041 return (EINVAL); 1042 } 1043 1044 if (*shstrsizep > elf_shstrtab_max) { 1045 if ((*shstrbasep = kmem_alloc(*shstrsizep, 1046 KM_NOSLEEP)) == NULL) { 1047 kmem_free(*shbasep, *shsizep); 1048 return (ENOMEM); 1049 } 1050 } else { 1051 *shstrbasep = kmem_alloc(*shstrsizep, KM_SLEEP); 1052 } 1053 1054 if ((err = vn_rdwr(UIO_READ, vp, *shstrbasep, *shstrsizep, 1055 (offset_t)shdr->sh_offset, UIO_SYSSPACE, 0, (rlim64_t)0, 1056 credp, &resid)) != 0) { 1057 kmem_free(*shbasep, *shsizep); 1058 kmem_free(*shstrbasep, *shstrsizep); 1059 return (err); 1060 } 1061 1062 /* 1063 * Make sure the strtab is null-terminated to make sure we 1064 * don't run off the end of the table. 1065 */ 1066 (*shstrbasep)[*shstrsizep - 1] = '\0'; 1067 1068 return (0); 1069 } 1070 1071 static int 1072 mapelfexec( 1073 vnode_t *vp, 1074 Ehdr *ehdr, 1075 int nphdrs, 1076 caddr_t phdrbase, 1077 Phdr **uphdr, 1078 Phdr **dyphdr, 1079 Phdr **stphdr, 1080 Phdr **dtphdr, 1081 Phdr *dataphdrp, 1082 caddr_t *bssbase, 1083 caddr_t *brkbase, 1084 intptr_t *voffset, 1085 intptr_t *minaddr, 1086 size_t len, 1087 long *execsz, 1088 size_t *brksize) 1089 { 1090 Phdr *phdr; 1091 int i, prot, error; 1092 caddr_t addr; 1093 size_t zfodsz; 1094 int ptload = 0; 1095 int page; 1096 off_t offset; 1097 int hsize = ehdr->e_phentsize; 1098 caddr_t mintmp = (caddr_t)-1; 1099 extern int use_brk_lpg; 1100 1101 if (ehdr->e_type == ET_DYN) { 1102 /* 1103 * Obtain the virtual address of a hole in the 1104 * address space to map the "interpreter". 1105 */ 1106 map_addr(&addr, len, (offset_t)0, 1, 0); 1107 if (addr == NULL) 1108 return (ENOMEM); 1109 *voffset = (intptr_t)addr; 1110 } else { 1111 *voffset = 0; 1112 } 1113 phdr = (Phdr *)phdrbase; 1114 for (i = nphdrs; i > 0; i--) { 1115 switch (phdr->p_type) { 1116 case PT_LOAD: 1117 if ((*dyphdr != NULL) && (*uphdr == NULL)) 1118 return (0); 1119 1120 ptload = 1; 1121 prot = PROT_USER; 1122 if (phdr->p_flags & PF_R) 1123 prot |= PROT_READ; 1124 if (phdr->p_flags & PF_W) 1125 prot |= PROT_WRITE; 1126 if (phdr->p_flags & PF_X) 1127 prot |= PROT_EXEC; 1128 1129 addr = (caddr_t)((uintptr_t)phdr->p_vaddr + *voffset); 1130 1131 /* 1132 * Keep track of the segment with the lowest starting 1133 * address. 1134 */ 1135 if (addr < mintmp) 1136 mintmp = addr; 1137 1138 zfodsz = (size_t)phdr->p_memsz - phdr->p_filesz; 1139 1140 offset = phdr->p_offset; 1141 if (((uintptr_t)offset & PAGEOFFSET) == 1142 ((uintptr_t)addr & PAGEOFFSET) && 1143 (!(vp->v_flag & VNOMAP))) { 1144 page = 1; 1145 } else { 1146 page = 0; 1147 } 1148 1149 /* 1150 * Set the heap pagesize for OOB when the bss size 1151 * is known and use_brk_lpg is not 0. 1152 */ 1153 if (brksize != NULL && use_brk_lpg && 1154 zfodsz != 0 && phdr == dataphdrp && 1155 (prot & PROT_WRITE)) { 1156 size_t tlen = P2NPHASE((uintptr_t)addr + 1157 phdr->p_filesz, PAGESIZE); 1158 1159 if (zfodsz > tlen) { 1160 curproc->p_brkpageszc = 1161 page_szc(map_pgsz(MAPPGSZ_HEAP, 1162 curproc, addr + phdr->p_filesz + 1163 tlen, zfodsz - tlen, 0)); 1164 } 1165 } 1166 1167 if (curproc->p_brkpageszc != 0 && phdr == dataphdrp && 1168 (prot & PROT_WRITE)) { 1169 uint_t szc = curproc->p_brkpageszc; 1170 size_t pgsz = page_get_pagesize(szc); 1171 caddr_t ebss = addr + phdr->p_memsz; 1172 size_t extra_zfodsz; 1173 1174 ASSERT(pgsz > PAGESIZE); 1175 1176 extra_zfodsz = P2NPHASE((uintptr_t)ebss, pgsz); 1177 1178 if (error = execmap(vp, addr, phdr->p_filesz, 1179 zfodsz + extra_zfodsz, phdr->p_offset, 1180 prot, page, szc)) 1181 goto bad; 1182 if (brksize != NULL) 1183 *brksize = extra_zfodsz; 1184 } else { 1185 if (error = execmap(vp, addr, phdr->p_filesz, 1186 zfodsz, phdr->p_offset, prot, page, 0)) 1187 goto bad; 1188 } 1189 1190 if (bssbase != NULL && addr >= *bssbase && 1191 phdr == dataphdrp) { 1192 *bssbase = addr + phdr->p_filesz; 1193 } 1194 if (brkbase != NULL && addr >= *brkbase) { 1195 *brkbase = addr + phdr->p_memsz; 1196 } 1197 1198 *execsz += btopr(phdr->p_memsz); 1199 break; 1200 1201 case PT_INTERP: 1202 if (ptload) 1203 goto bad; 1204 *dyphdr = phdr; 1205 break; 1206 1207 case PT_SHLIB: 1208 *stphdr = phdr; 1209 break; 1210 1211 case PT_PHDR: 1212 if (ptload) 1213 goto bad; 1214 *uphdr = phdr; 1215 break; 1216 1217 case PT_NULL: 1218 case PT_DYNAMIC: 1219 case PT_NOTE: 1220 break; 1221 1222 case PT_SUNWDTRACE: 1223 if (dtphdr != NULL) 1224 *dtphdr = phdr; 1225 break; 1226 1227 default: 1228 break; 1229 } 1230 phdr = (Phdr *)((caddr_t)phdr + hsize); 1231 } 1232 1233 if (minaddr != NULL) { 1234 ASSERT(mintmp != (caddr_t)-1); 1235 *minaddr = (intptr_t)mintmp; 1236 } 1237 1238 return (0); 1239 bad: 1240 if (error == 0) 1241 error = EINVAL; 1242 return (error); 1243 } 1244 1245 int 1246 elfnote(vnode_t *vp, offset_t *offsetp, int type, int descsz, void *desc, 1247 rlim64_t rlimit, cred_t *credp) 1248 { 1249 Note note; 1250 int error; 1251 1252 bzero(¬e, sizeof (note)); 1253 bcopy("CORE", note.name, 4); 1254 note.nhdr.n_type = type; 1255 /* 1256 * The System V ABI states that n_namesz must be the length of the 1257 * string that follows the Nhdr structure including the terminating 1258 * null. The ABI also specifies that sufficient padding should be 1259 * included so that the description that follows the name string 1260 * begins on a 4- or 8-byte boundary for 32- and 64-bit binaries 1261 * respectively. However, since this change was not made correctly 1262 * at the time of the 64-bit port, both 32- and 64-bit binaries 1263 * descriptions are only guaranteed to begin on a 4-byte boundary. 1264 */ 1265 note.nhdr.n_namesz = 5; 1266 note.nhdr.n_descsz = roundup(descsz, sizeof (Word)); 1267 1268 if (error = core_write(vp, UIO_SYSSPACE, *offsetp, ¬e, 1269 sizeof (note), rlimit, credp)) 1270 return (error); 1271 1272 *offsetp += sizeof (note); 1273 1274 if (error = core_write(vp, UIO_SYSSPACE, *offsetp, desc, 1275 note.nhdr.n_descsz, rlimit, credp)) 1276 return (error); 1277 1278 *offsetp += note.nhdr.n_descsz; 1279 return (0); 1280 } 1281 1282 /* 1283 * Copy the section data from one vnode to the section of another vnode. 1284 */ 1285 static void 1286 copy_scn(Shdr *src, vnode_t *src_vp, Shdr *dst, vnode_t *dst_vp, Off *doffset, 1287 void *buf, size_t size, cred_t *credp, rlim64_t rlimit) 1288 { 1289 ssize_t resid; 1290 size_t len, n = src->sh_size; 1291 offset_t off = 0; 1292 1293 while (n != 0) { 1294 len = MIN(size, n); 1295 if (vn_rdwr(UIO_READ, src_vp, buf, len, src->sh_offset + off, 1296 UIO_SYSSPACE, 0, (rlim64_t)0, credp, &resid) != 0 || 1297 resid >= len || 1298 core_write(dst_vp, UIO_SYSSPACE, *doffset + off, 1299 buf, len - resid, rlimit, credp) != 0) { 1300 dst->sh_size = 0; 1301 dst->sh_offset = 0; 1302 return; 1303 } 1304 1305 ASSERT(n >= len - resid); 1306 1307 n -= len - resid; 1308 off += len - resid; 1309 } 1310 1311 *doffset += src->sh_size; 1312 } 1313 1314 #ifdef _ELF32_COMPAT 1315 extern size_t elf_datasz_max; 1316 #else 1317 size_t elf_datasz_max = 1 * 1024 * 1024; 1318 #endif 1319 1320 /* 1321 * This function processes mappings that correspond to load objects to 1322 * examine their respective sections for elfcore(). It's called once with 1323 * v set to NULL to count the number of sections that we're going to need 1324 * and then again with v set to some allocated buffer that we fill in with 1325 * all the section data. 1326 */ 1327 static int 1328 process_scns(core_content_t content, proc_t *p, cred_t *credp, vnode_t *vp, 1329 Shdr *v, int nv, rlim64_t rlimit, Off *doffsetp, int *nshdrsp) 1330 { 1331 vnode_t *lastvp = NULL; 1332 struct seg *seg; 1333 int i, j; 1334 void *data = NULL; 1335 size_t datasz = 0; 1336 shstrtab_t shstrtab; 1337 struct as *as = p->p_as; 1338 int error = 0; 1339 1340 if (v != NULL) 1341 shstrtab_init(&shstrtab); 1342 1343 i = 1; 1344 for (seg = AS_SEGFIRST(as); seg != NULL; seg = AS_SEGNEXT(as, seg)) { 1345 uint_t prot; 1346 vnode_t *mvp; 1347 void *tmp = NULL; 1348 caddr_t saddr = seg->s_base; 1349 caddr_t naddr; 1350 caddr_t eaddr; 1351 size_t segsize; 1352 1353 Ehdr ehdr; 1354 int nshdrs, shstrndx, nphdrs; 1355 caddr_t shbase; 1356 ssize_t shsize; 1357 char *shstrbase; 1358 ssize_t shstrsize; 1359 1360 Shdr *shdr; 1361 const char *name; 1362 size_t sz; 1363 uintptr_t off; 1364 1365 int ctf_ndx = 0; 1366 int symtab_ndx = 0; 1367 1368 /* 1369 * Since we're just looking for text segments of load 1370 * objects, we only care about the protection bits; we don't 1371 * care about the actual size of the segment so we use the 1372 * reserved size. If the segment's size is zero, there's 1373 * something fishy going on so we ignore this segment. 1374 */ 1375 if (seg->s_ops != &segvn_ops || 1376 SEGOP_GETVP(seg, seg->s_base, &mvp) != 0 || 1377 mvp == lastvp || mvp == NULL || mvp->v_type != VREG || 1378 (segsize = pr_getsegsize(seg, 1)) == 0) 1379 continue; 1380 1381 eaddr = saddr + segsize; 1382 prot = pr_getprot(seg, 1, &tmp, &saddr, &naddr, eaddr); 1383 pr_getprot_done(&tmp); 1384 1385 /* 1386 * Skip this segment unless the protection bits look like 1387 * what we'd expect for a text segment. 1388 */ 1389 if ((prot & (PROT_WRITE | PROT_EXEC)) != PROT_EXEC) 1390 continue; 1391 1392 if (getelfhead(mvp, credp, &ehdr, &nshdrs, &shstrndx, 1393 &nphdrs) != 0 || 1394 getelfshdr(mvp, credp, &ehdr, nshdrs, shstrndx, 1395 &shbase, &shsize, &shstrbase, &shstrsize) != 0) 1396 continue; 1397 1398 off = ehdr.e_shentsize; 1399 for (j = 1; j < nshdrs; j++, off += ehdr.e_shentsize) { 1400 Shdr *symtab = NULL, *strtab; 1401 1402 shdr = (Shdr *)(shbase + off); 1403 1404 if (shdr->sh_name >= shstrsize) 1405 continue; 1406 1407 name = shstrbase + shdr->sh_name; 1408 1409 if (strcmp(name, shstrtab_data[STR_CTF]) == 0) { 1410 if ((content & CC_CONTENT_CTF) == 0 || 1411 ctf_ndx != 0) 1412 continue; 1413 1414 if (shdr->sh_link > 0 && 1415 shdr->sh_link < nshdrs) { 1416 symtab = (Shdr *)(shbase + 1417 shdr->sh_link * ehdr.e_shentsize); 1418 } 1419 1420 if (v != NULL && i < nv - 1) { 1421 if (shdr->sh_size > datasz && 1422 shdr->sh_size <= elf_datasz_max) { 1423 if (data != NULL) 1424 kmem_free(data, datasz); 1425 1426 datasz = shdr->sh_size; 1427 data = kmem_alloc(datasz, 1428 KM_SLEEP); 1429 } 1430 1431 v[i].sh_name = shstrtab_ndx(&shstrtab, 1432 STR_CTF); 1433 v[i].sh_addr = (Addr)(uintptr_t)saddr; 1434 v[i].sh_type = SHT_PROGBITS; 1435 v[i].sh_addralign = 4; 1436 *doffsetp = roundup(*doffsetp, 1437 v[i].sh_addralign); 1438 v[i].sh_offset = *doffsetp; 1439 v[i].sh_size = shdr->sh_size; 1440 if (symtab == NULL) { 1441 v[i].sh_link = 0; 1442 } else if (symtab->sh_type == 1443 SHT_SYMTAB && 1444 symtab_ndx != 0) { 1445 v[i].sh_link = 1446 symtab_ndx; 1447 } else { 1448 v[i].sh_link = i + 1; 1449 } 1450 1451 copy_scn(shdr, mvp, &v[i], vp, 1452 doffsetp, data, datasz, credp, 1453 rlimit); 1454 } 1455 1456 ctf_ndx = i++; 1457 1458 /* 1459 * We've already dumped the symtab. 1460 */ 1461 if (symtab != NULL && 1462 symtab->sh_type == SHT_SYMTAB && 1463 symtab_ndx != 0) 1464 continue; 1465 1466 } else if (strcmp(name, 1467 shstrtab_data[STR_SYMTAB]) == 0) { 1468 if ((content & CC_CONTENT_SYMTAB) == 0 || 1469 symtab != 0) 1470 continue; 1471 1472 symtab = shdr; 1473 } 1474 1475 if (symtab != NULL) { 1476 if ((symtab->sh_type != SHT_DYNSYM && 1477 symtab->sh_type != SHT_SYMTAB) || 1478 symtab->sh_link == 0 || 1479 symtab->sh_link >= nshdrs) 1480 continue; 1481 1482 strtab = (Shdr *)(shbase + 1483 symtab->sh_link * ehdr.e_shentsize); 1484 1485 if (strtab->sh_type != SHT_STRTAB) 1486 continue; 1487 1488 if (v != NULL && i < nv - 2) { 1489 sz = MAX(symtab->sh_size, 1490 strtab->sh_size); 1491 if (sz > datasz && 1492 sz <= elf_datasz_max) { 1493 if (data != NULL) 1494 kmem_free(data, datasz); 1495 1496 datasz = sz; 1497 data = kmem_alloc(datasz, 1498 KM_SLEEP); 1499 } 1500 1501 if (symtab->sh_type == SHT_DYNSYM) { 1502 v[i].sh_name = shstrtab_ndx( 1503 &shstrtab, STR_DYNSYM); 1504 v[i + 1].sh_name = shstrtab_ndx( 1505 &shstrtab, STR_DYNSTR); 1506 } else { 1507 v[i].sh_name = shstrtab_ndx( 1508 &shstrtab, STR_SYMTAB); 1509 v[i + 1].sh_name = shstrtab_ndx( 1510 &shstrtab, STR_STRTAB); 1511 } 1512 1513 v[i].sh_type = symtab->sh_type; 1514 v[i].sh_addr = symtab->sh_addr; 1515 if (ehdr.e_type == ET_DYN || 1516 v[i].sh_addr == 0) 1517 v[i].sh_addr += 1518 (Addr)(uintptr_t)saddr; 1519 v[i].sh_addralign = 1520 symtab->sh_addralign; 1521 *doffsetp = roundup(*doffsetp, 1522 v[i].sh_addralign); 1523 v[i].sh_offset = *doffsetp; 1524 v[i].sh_size = symtab->sh_size; 1525 v[i].sh_link = i + 1; 1526 v[i].sh_entsize = symtab->sh_entsize; 1527 v[i].sh_info = symtab->sh_info; 1528 1529 copy_scn(symtab, mvp, &v[i], vp, 1530 doffsetp, data, datasz, credp, 1531 rlimit); 1532 1533 v[i + 1].sh_type = SHT_STRTAB; 1534 v[i + 1].sh_flags = SHF_STRINGS; 1535 v[i + 1].sh_addr = symtab->sh_addr; 1536 if (ehdr.e_type == ET_DYN || 1537 v[i + 1].sh_addr == 0) 1538 v[i + 1].sh_addr += 1539 (Addr)(uintptr_t)saddr; 1540 v[i + 1].sh_addralign = 1541 strtab->sh_addralign; 1542 *doffsetp = roundup(*doffsetp, 1543 v[i + 1].sh_addralign); 1544 v[i + 1].sh_offset = *doffsetp; 1545 v[i + 1].sh_size = strtab->sh_size; 1546 1547 copy_scn(strtab, mvp, &v[i + 1], vp, 1548 doffsetp, data, datasz, credp, 1549 rlimit); 1550 } 1551 1552 if (symtab->sh_type == SHT_SYMTAB) 1553 symtab_ndx = i; 1554 i += 2; 1555 } 1556 } 1557 1558 kmem_free(shstrbase, shstrsize); 1559 kmem_free(shbase, shsize); 1560 1561 lastvp = mvp; 1562 } 1563 1564 if (v == NULL) { 1565 if (i == 1) 1566 *nshdrsp = 0; 1567 else 1568 *nshdrsp = i + 1; 1569 goto done; 1570 } 1571 1572 if (i != nv - 1) { 1573 cmn_err(CE_WARN, "elfcore: core dump failed for " 1574 "process %d; address space is changing", p->p_pid); 1575 error = EIO; 1576 goto done; 1577 } 1578 1579 v[i].sh_name = shstrtab_ndx(&shstrtab, STR_SHSTRTAB); 1580 v[i].sh_size = shstrtab_size(&shstrtab); 1581 v[i].sh_addralign = 1; 1582 *doffsetp = roundup(*doffsetp, v[i].sh_addralign); 1583 v[i].sh_offset = *doffsetp; 1584 v[i].sh_flags = SHF_STRINGS; 1585 v[i].sh_type = SHT_STRTAB; 1586 1587 if (v[i].sh_size > datasz) { 1588 if (data != NULL) 1589 kmem_free(data, datasz); 1590 1591 datasz = v[i].sh_size; 1592 data = kmem_alloc(datasz, 1593 KM_SLEEP); 1594 } 1595 1596 shstrtab_dump(&shstrtab, data); 1597 1598 if ((error = core_write(vp, UIO_SYSSPACE, *doffsetp, 1599 data, v[i].sh_size, rlimit, credp)) != 0) 1600 goto done; 1601 1602 *doffsetp += v[i].sh_size; 1603 1604 done: 1605 if (data != NULL) 1606 kmem_free(data, datasz); 1607 1608 return (error); 1609 } 1610 1611 int 1612 elfcore(vnode_t *vp, proc_t *p, cred_t *credp, rlim64_t rlimit, int sig, 1613 core_content_t content) 1614 { 1615 offset_t poffset, soffset; 1616 Off doffset; 1617 int error, i, nphdrs, nshdrs; 1618 int overflow = 0; 1619 struct seg *seg; 1620 struct as *as = p->p_as; 1621 union { 1622 Ehdr ehdr; 1623 Phdr phdr[1]; 1624 Shdr shdr[1]; 1625 } *bigwad; 1626 size_t bigsize; 1627 size_t phdrsz, shdrsz; 1628 Ehdr *ehdr; 1629 Phdr *v; 1630 caddr_t brkbase; 1631 size_t brksize; 1632 caddr_t stkbase; 1633 size_t stksize; 1634 int ntries = 0; 1635 1636 top: 1637 /* 1638 * Make sure we have everything we need (registers, etc.). 1639 * All other lwps have already stopped and are in an orderly state. 1640 */ 1641 ASSERT(p == ttoproc(curthread)); 1642 prstop(0, 0); 1643 1644 AS_LOCK_ENTER(as, &as->a_lock, RW_WRITER); 1645 nphdrs = prnsegs(as, 0) + 2; /* two CORE note sections */ 1646 1647 /* 1648 * Count the number of section headers we're going to need. 1649 */ 1650 nshdrs = 0; 1651 if (content & (CC_CONTENT_CTF | CC_CONTENT_SYMTAB)) { 1652 (void) process_scns(content, p, credp, NULL, NULL, NULL, 0, 1653 NULL, &nshdrs); 1654 } 1655 AS_LOCK_EXIT(as, &as->a_lock); 1656 1657 ASSERT(nshdrs == 0 || nshdrs > 1); 1658 1659 /* 1660 * The core file contents may required zero section headers, but if 1661 * we overflow the 16 bits allotted to the program header count in 1662 * the ELF header, we'll need that program header at index zero. 1663 */ 1664 if (nshdrs == 0 && nphdrs >= PN_XNUM) 1665 nshdrs = 1; 1666 1667 phdrsz = nphdrs * sizeof (Phdr); 1668 shdrsz = nshdrs * sizeof (Shdr); 1669 1670 bigsize = MAX(sizeof (*bigwad), MAX(phdrsz, shdrsz)); 1671 bigwad = kmem_alloc(bigsize, KM_SLEEP); 1672 1673 ehdr = &bigwad->ehdr; 1674 bzero(ehdr, sizeof (*ehdr)); 1675 1676 ehdr->e_ident[EI_MAG0] = ELFMAG0; 1677 ehdr->e_ident[EI_MAG1] = ELFMAG1; 1678 ehdr->e_ident[EI_MAG2] = ELFMAG2; 1679 ehdr->e_ident[EI_MAG3] = ELFMAG3; 1680 ehdr->e_ident[EI_CLASS] = ELFCLASS; 1681 ehdr->e_type = ET_CORE; 1682 1683 #if !defined(_LP64) || defined(_ELF32_COMPAT) 1684 1685 #if defined(__sparc) 1686 ehdr->e_ident[EI_DATA] = ELFDATA2MSB; 1687 ehdr->e_machine = EM_SPARC; 1688 #elif defined(__i386) || defined(__i386_COMPAT) 1689 ehdr->e_ident[EI_DATA] = ELFDATA2LSB; 1690 ehdr->e_machine = EM_386; 1691 #else 1692 #error "no recognized machine type is defined" 1693 #endif 1694 1695 #else /* !defined(_LP64) || defined(_ELF32_COMPAT) */ 1696 1697 #if defined(__sparc) 1698 ehdr->e_ident[EI_DATA] = ELFDATA2MSB; 1699 ehdr->e_machine = EM_SPARCV9; 1700 #elif defined(__amd64) 1701 ehdr->e_ident[EI_DATA] = ELFDATA2LSB; 1702 ehdr->e_machine = EM_AMD64; 1703 #else 1704 #error "no recognized 64-bit machine type is defined" 1705 #endif 1706 1707 #endif /* !defined(_LP64) || defined(_ELF32_COMPAT) */ 1708 1709 /* 1710 * If the count of program headers or section headers or the index 1711 * of the section string table can't fit in the mere 16 bits 1712 * shortsightedly allotted to them in the ELF header, we use the 1713 * extended formats and put the real values in the section header 1714 * as index 0. 1715 */ 1716 ehdr->e_version = EV_CURRENT; 1717 ehdr->e_ehsize = sizeof (Ehdr); 1718 1719 if (nphdrs >= PN_XNUM) 1720 ehdr->e_phnum = PN_XNUM; 1721 else 1722 ehdr->e_phnum = (unsigned short)nphdrs; 1723 1724 ehdr->e_phoff = sizeof (Ehdr); 1725 ehdr->e_phentsize = sizeof (Phdr); 1726 1727 if (nshdrs > 0) { 1728 if (nshdrs >= SHN_LORESERVE) 1729 ehdr->e_shnum = 0; 1730 else 1731 ehdr->e_shnum = (unsigned short)nshdrs; 1732 1733 if (nshdrs - 1 >= SHN_LORESERVE) 1734 ehdr->e_shstrndx = SHN_XINDEX; 1735 else 1736 ehdr->e_shstrndx = (unsigned short)(nshdrs - 1); 1737 1738 ehdr->e_shoff = ehdr->e_phoff + ehdr->e_phentsize * nphdrs; 1739 ehdr->e_shentsize = sizeof (Shdr); 1740 } 1741 1742 if (error = core_write(vp, UIO_SYSSPACE, (offset_t)0, ehdr, 1743 sizeof (Ehdr), rlimit, credp)) 1744 goto done; 1745 1746 poffset = sizeof (Ehdr); 1747 soffset = sizeof (Ehdr) + phdrsz; 1748 doffset = sizeof (Ehdr) + phdrsz + shdrsz; 1749 1750 v = &bigwad->phdr[0]; 1751 bzero(v, phdrsz); 1752 1753 setup_old_note_header(&v[0], p); 1754 v[0].p_offset = doffset = roundup(doffset, sizeof (Word)); 1755 doffset += v[0].p_filesz; 1756 1757 setup_note_header(&v[1], p); 1758 v[1].p_offset = doffset = roundup(doffset, sizeof (Word)); 1759 doffset += v[1].p_filesz; 1760 1761 mutex_enter(&p->p_lock); 1762 1763 brkbase = p->p_brkbase; 1764 brksize = p->p_brksize; 1765 1766 stkbase = p->p_usrstack - p->p_stksize; 1767 stksize = p->p_stksize; 1768 1769 mutex_exit(&p->p_lock); 1770 1771 AS_LOCK_ENTER(as, &as->a_lock, RW_WRITER); 1772 i = 2; 1773 for (seg = AS_SEGFIRST(as); seg != NULL; seg = AS_SEGNEXT(as, seg)) { 1774 caddr_t eaddr = seg->s_base + pr_getsegsize(seg, 0); 1775 caddr_t saddr, naddr; 1776 void *tmp = NULL; 1777 extern struct seg_ops segspt_shmops; 1778 1779 for (saddr = seg->s_base; saddr < eaddr; saddr = naddr) { 1780 uint_t prot; 1781 size_t size; 1782 int type; 1783 vnode_t *mvp; 1784 1785 prot = pr_getprot(seg, 0, &tmp, &saddr, &naddr, eaddr); 1786 prot &= PROT_READ | PROT_WRITE | PROT_EXEC; 1787 if ((size = (size_t)(naddr - saddr)) == 0) 1788 continue; 1789 if (i == nphdrs) { 1790 overflow++; 1791 continue; 1792 } 1793 v[i].p_type = PT_LOAD; 1794 v[i].p_vaddr = (Addr)(uintptr_t)saddr; 1795 v[i].p_memsz = size; 1796 if (prot & PROT_READ) 1797 v[i].p_flags |= PF_R; 1798 if (prot & PROT_WRITE) 1799 v[i].p_flags |= PF_W; 1800 if (prot & PROT_EXEC) 1801 v[i].p_flags |= PF_X; 1802 1803 /* 1804 * Figure out which mappings to include in the core. 1805 */ 1806 type = SEGOP_GETTYPE(seg, saddr); 1807 1808 if (saddr == stkbase && size == stksize) { 1809 if (!(content & CC_CONTENT_STACK)) 1810 goto exclude; 1811 1812 } else if (saddr == brkbase && size == brksize) { 1813 if (!(content & CC_CONTENT_HEAP)) 1814 goto exclude; 1815 1816 } else if (seg->s_ops == &segspt_shmops) { 1817 if (type & MAP_NORESERVE) { 1818 if (!(content & CC_CONTENT_DISM)) 1819 goto exclude; 1820 } else { 1821 if (!(content & CC_CONTENT_ISM)) 1822 goto exclude; 1823 } 1824 1825 } else if (seg->s_ops != &segvn_ops) { 1826 goto exclude; 1827 1828 } else if (type & MAP_SHARED) { 1829 if (shmgetid(p, saddr) != SHMID_NONE) { 1830 if (!(content & CC_CONTENT_SHM)) 1831 goto exclude; 1832 1833 } else if (SEGOP_GETVP(seg, seg->s_base, 1834 &mvp) != 0 || mvp == NULL || 1835 mvp->v_type != VREG) { 1836 if (!(content & CC_CONTENT_SHANON)) 1837 goto exclude; 1838 1839 } else { 1840 if (!(content & CC_CONTENT_SHFILE)) 1841 goto exclude; 1842 } 1843 1844 } else if (SEGOP_GETVP(seg, seg->s_base, &mvp) != 0 || 1845 mvp == NULL || mvp->v_type != VREG) { 1846 if (!(content & CC_CONTENT_ANON)) 1847 goto exclude; 1848 1849 } else if (prot == (PROT_READ | PROT_EXEC)) { 1850 if (!(content & CC_CONTENT_TEXT)) 1851 goto exclude; 1852 1853 } else if (prot == PROT_READ) { 1854 if (!(content & CC_CONTENT_RODATA)) 1855 goto exclude; 1856 1857 } else { 1858 if (!(content & CC_CONTENT_DATA)) 1859 goto exclude; 1860 } 1861 1862 doffset = roundup(doffset, sizeof (Word)); 1863 v[i].p_offset = doffset; 1864 v[i].p_filesz = size; 1865 doffset += size; 1866 exclude: 1867 i++; 1868 } 1869 ASSERT(tmp == NULL); 1870 } 1871 AS_LOCK_EXIT(as, &as->a_lock); 1872 1873 if (overflow || i != nphdrs) { 1874 if (ntries++ == 0) { 1875 kmem_free(bigwad, bigsize); 1876 goto top; 1877 } 1878 cmn_err(CE_WARN, "elfcore: core dump failed for " 1879 "process %d; address space is changing", p->p_pid); 1880 error = EIO; 1881 goto done; 1882 } 1883 1884 if ((error = core_write(vp, UIO_SYSSPACE, poffset, 1885 v, phdrsz, rlimit, credp)) != 0) 1886 goto done; 1887 1888 if ((error = write_old_elfnotes(p, sig, vp, v[0].p_offset, rlimit, 1889 credp)) != 0) 1890 goto done; 1891 1892 if ((error = write_elfnotes(p, sig, vp, v[1].p_offset, rlimit, 1893 credp, content)) != 0) 1894 goto done; 1895 1896 for (i = 2; i < nphdrs; i++) { 1897 if (v[i].p_filesz == 0) 1898 continue; 1899 1900 /* 1901 * If dumping out this segment fails, rather than failing 1902 * the core dump entirely, we reset the size of the mapping 1903 * to zero to indicate that the data is absent from the core 1904 * file and or in the PF_SUNW_FAILURE flag to differentiate 1905 * this from mappings that were excluded due to the core file 1906 * content settings. 1907 */ 1908 if ((error = core_seg(p, vp, v[i].p_offset, 1909 (caddr_t)(uintptr_t)v[i].p_vaddr, v[i].p_filesz, 1910 rlimit, credp)) != 0) { 1911 1912 /* 1913 * Since the space reserved for the segment is now 1914 * unused, we stash the errno in the first four 1915 * bytes. This undocumented interface will let us 1916 * understand the nature of the failure. 1917 */ 1918 (void) core_write(vp, UIO_SYSSPACE, v[i].p_offset, 1919 &error, sizeof (error), rlimit, credp); 1920 1921 v[i].p_filesz = 0; 1922 v[i].p_flags |= PF_SUNW_FAILURE; 1923 if ((error = core_write(vp, UIO_SYSSPACE, 1924 poffset + sizeof (v[i]) * i, &v[i], sizeof (v[i]), 1925 rlimit, credp)) != 0) 1926 goto done; 1927 } 1928 } 1929 1930 if (nshdrs > 0) { 1931 bzero(&bigwad->shdr[0], shdrsz); 1932 1933 if (nshdrs >= SHN_LORESERVE) 1934 bigwad->shdr[0].sh_size = nshdrs; 1935 1936 if (nshdrs - 1 >= SHN_LORESERVE) 1937 bigwad->shdr[0].sh_link = nshdrs - 1; 1938 1939 if (nphdrs >= PN_XNUM) 1940 bigwad->shdr[0].sh_info = nphdrs; 1941 1942 if (nshdrs > 1) { 1943 AS_LOCK_ENTER(as, &as->a_lock, RW_WRITER); 1944 if ((error = process_scns(content, p, credp, vp, 1945 &bigwad->shdr[0], nshdrs, rlimit, &doffset, 1946 NULL)) != 0) { 1947 AS_LOCK_EXIT(as, &as->a_lock); 1948 goto done; 1949 } 1950 AS_LOCK_EXIT(as, &as->a_lock); 1951 } 1952 1953 if ((error = core_write(vp, UIO_SYSSPACE, soffset, 1954 &bigwad->shdr[0], shdrsz, rlimit, credp)) != 0) 1955 goto done; 1956 } 1957 1958 done: 1959 kmem_free(bigwad, bigsize); 1960 return (error); 1961 } 1962 1963 #ifndef _ELF32_COMPAT 1964 1965 static struct execsw esw = { 1966 #ifdef _LP64 1967 elf64magicstr, 1968 #else /* _LP64 */ 1969 elf32magicstr, 1970 #endif /* _LP64 */ 1971 0, 1972 5, 1973 elfexec, 1974 elfcore 1975 }; 1976 1977 static struct modlexec modlexec = { 1978 &mod_execops, "exec module for elf %I%", &esw 1979 }; 1980 1981 #ifdef _LP64 1982 extern int elf32exec(vnode_t *vp, execa_t *uap, uarg_t *args, 1983 intpdata_t *idatap, int level, long *execsz, 1984 int setid, caddr_t exec_file, cred_t *cred, 1985 int brand_action); 1986 extern int elf32core(vnode_t *vp, proc_t *p, cred_t *credp, 1987 rlim64_t rlimit, int sig, core_content_t content); 1988 1989 static struct execsw esw32 = { 1990 elf32magicstr, 1991 0, 1992 5, 1993 elf32exec, 1994 elf32core 1995 }; 1996 1997 static struct modlexec modlexec32 = { 1998 &mod_execops, "32-bit exec module for elf", &esw32 1999 }; 2000 #endif /* _LP64 */ 2001 2002 static struct modlinkage modlinkage = { 2003 MODREV_1, 2004 (void *)&modlexec, 2005 #ifdef _LP64 2006 (void *)&modlexec32, 2007 #endif /* _LP64 */ 2008 NULL 2009 }; 2010 2011 int 2012 _init(void) 2013 { 2014 return (mod_install(&modlinkage)); 2015 } 2016 2017 int 2018 _fini(void) 2019 { 2020 return (mod_remove(&modlinkage)); 2021 } 2022 2023 int 2024 _info(struct modinfo *modinfop) 2025 { 2026 return (mod_info(&modlinkage, modinfop)); 2027 } 2028 2029 #endif /* !_ELF32_COMPAT */ 2030