1 /* $OpenBSD: exec_elf.c,v 1.145 2018/07/20 21:57:26 deraadt Exp $ */ 2 3 /* 4 * Copyright (c) 1996 Per Fogelstrom 5 * All rights reserved. 6 * 7 * Copyright (c) 1994 Christos Zoulas 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 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 * 32 */ 33 34 /* 35 * Copyright (c) 2001 Wasabi Systems, Inc. 36 * All rights reserved. 37 * 38 * Written by Jason R. Thorpe for Wasabi Systems, Inc. 39 * 40 * Redistribution and use in source and binary forms, with or without 41 * modification, are permitted provided that the following conditions 42 * are met: 43 * 1. Redistributions of source code must retain the above copyright 44 * notice, this list of conditions and the following disclaimer. 45 * 2. Redistributions in binary form must reproduce the above copyright 46 * notice, this list of conditions and the following disclaimer in the 47 * documentation and/or other materials provided with the distribution. 48 * 3. All advertising materials mentioning features or use of this software 49 * must display the following acknowledgement: 50 * This product includes software developed for the NetBSD Project by 51 * Wasabi Systems, Inc. 52 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 53 * or promote products derived from this software without specific prior 54 * written permission. 55 * 56 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 57 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 58 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 59 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 60 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 61 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 62 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 63 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 64 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 65 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 66 * POSSIBILITY OF SUCH DAMAGE. 67 */ 68 69 #include <sys/param.h> 70 #include <sys/systm.h> 71 #include <sys/kernel.h> 72 #include <sys/proc.h> 73 #include <sys/malloc.h> 74 #include <sys/pool.h> 75 #include <sys/mount.h> 76 #include <sys/namei.h> 77 #include <sys/vnode.h> 78 #include <sys/core.h> 79 #include <sys/syslog.h> 80 #include <sys/exec.h> 81 #include <sys/exec_elf.h> 82 #include <sys/fcntl.h> 83 #include <sys/ptrace.h> 84 #include <sys/syscall.h> 85 #include <sys/signalvar.h> 86 #include <sys/stat.h> 87 #include <sys/pledge.h> 88 89 #include <sys/mman.h> 90 91 #include <uvm/uvm_extern.h> 92 93 #include <machine/reg.h> 94 #include <machine/exec.h> 95 96 int elf_load_file(struct proc *, char *, struct exec_package *, 97 struct elf_args *); 98 int elf_check_header(Elf_Ehdr *); 99 int elf_read_from(struct proc *, struct vnode *, u_long, void *, int); 100 void elf_load_psection(struct exec_vmcmd_set *, struct vnode *, 101 Elf_Phdr *, Elf_Addr *, Elf_Addr *, int *, int); 102 int coredump_elf(struct proc *, void *); 103 void *elf_copyargs(struct exec_package *, struct ps_strings *, void *, 104 void *); 105 int exec_elf_fixup(struct proc *, struct exec_package *); 106 int elf_os_pt_note(struct proc *, struct exec_package *, Elf_Ehdr *, 107 char *, size_t, size_t); 108 109 extern char sigcode[], esigcode[], sigcoderet[]; 110 #ifdef SYSCALL_DEBUG 111 extern char *syscallnames[]; 112 #endif 113 114 /* round up and down to page boundaries. */ 115 #define ELF_ROUND(a, b) (((a) + (b) - 1) & ~((b) - 1)) 116 #define ELF_TRUNC(a, b) ((a) & ~((b) - 1)) 117 118 /* 119 * We limit the number of program headers to 32, this should 120 * be a reasonable limit for ELF, the most we have seen so far is 12 121 */ 122 #define ELF_MAX_VALID_PHDR 32 123 124 /* 125 * How many entries are in the AuxInfo array we pass to the process? 126 */ 127 #define ELF_AUX_ENTRIES 8 128 129 /* 130 * This is the OpenBSD ELF emul 131 */ 132 struct emul emul_elf = { 133 "native", 134 NULL, 135 SYS_syscall, 136 SYS_MAXSYSCALL, 137 sysent, 138 #ifdef SYSCALL_DEBUG 139 syscallnames, 140 #else 141 NULL, 142 #endif 143 (sizeof(AuxInfo) * ELF_AUX_ENTRIES / sizeof(char *)), 144 elf_copyargs, 145 setregs, 146 exec_elf_fixup, 147 coredump_elf, 148 sigcode, 149 esigcode, 150 sigcoderet 151 }; 152 153 /* 154 * Copy arguments onto the stack in the normal way, but add some 155 * space for extra information in case of dynamic binding. 156 */ 157 void * 158 elf_copyargs(struct exec_package *pack, struct ps_strings *arginfo, 159 void *stack, void *argp) 160 { 161 stack = copyargs(pack, arginfo, stack, argp); 162 if (!stack) 163 return (NULL); 164 165 /* 166 * Push space for extra arguments on the stack needed by 167 * dynamically linked binaries. 168 */ 169 if (pack->ep_emul_arg != NULL) { 170 pack->ep_emul_argp = stack; 171 stack = (char *)stack + ELF_AUX_ENTRIES * sizeof (AuxInfo); 172 } 173 return (stack); 174 } 175 176 /* 177 * Check header for validity; return 0 for ok, ENOEXEC if error 178 */ 179 int 180 elf_check_header(Elf_Ehdr *ehdr) 181 { 182 /* 183 * We need to check magic, class size, endianess, and version before 184 * we look at the rest of the Elf_Ehdr structure. These few elements 185 * are represented in a machine independent fashion. 186 */ 187 if (!IS_ELF(*ehdr) || 188 ehdr->e_ident[EI_CLASS] != ELF_TARG_CLASS || 189 ehdr->e_ident[EI_DATA] != ELF_TARG_DATA || 190 ehdr->e_ident[EI_VERSION] != ELF_TARG_VER) 191 return (ENOEXEC); 192 193 /* Now check the machine dependent header */ 194 if (ehdr->e_machine != ELF_TARG_MACH || 195 ehdr->e_version != ELF_TARG_VER) 196 return (ENOEXEC); 197 198 /* Don't allow an insane amount of sections. */ 199 if (ehdr->e_phnum > ELF_MAX_VALID_PHDR) 200 return (ENOEXEC); 201 202 return (0); 203 } 204 205 /* 206 * Load a psection at the appropriate address 207 */ 208 void 209 elf_load_psection(struct exec_vmcmd_set *vcset, struct vnode *vp, 210 Elf_Phdr *ph, Elf_Addr *addr, Elf_Addr *size, int *prot, int flags) 211 { 212 u_long msize, lsize, psize, rm, rf; 213 long diff, offset, bdiff; 214 Elf_Addr base; 215 216 /* 217 * If the user specified an address, then we load there. 218 */ 219 if (*addr != ELF_NO_ADDR) { 220 if (ph->p_align > 1) { 221 *addr = ELF_TRUNC(*addr, ph->p_align); 222 diff = ph->p_vaddr - ELF_TRUNC(ph->p_vaddr, ph->p_align); 223 /* page align vaddr */ 224 base = *addr + trunc_page(ph->p_vaddr) 225 - ELF_TRUNC(ph->p_vaddr, ph->p_align); 226 } else { 227 diff = 0; 228 base = *addr + trunc_page(ph->p_vaddr) - ph->p_vaddr; 229 } 230 } else { 231 *addr = ph->p_vaddr; 232 if (ph->p_align > 1) 233 *addr = ELF_TRUNC(*addr, ph->p_align); 234 base = trunc_page(ph->p_vaddr); 235 diff = ph->p_vaddr - *addr; 236 } 237 bdiff = ph->p_vaddr - trunc_page(ph->p_vaddr); 238 239 /* 240 * Enforce W^X and map W|X segments without X permission 241 * initially. The dynamic linker will make these read-only 242 * and add back X permission after relocation processing. 243 * Static executables with W|X segments will probably crash. 244 */ 245 *prot |= (ph->p_flags & PF_R) ? PROT_READ : 0; 246 *prot |= (ph->p_flags & PF_W) ? PROT_WRITE : 0; 247 if ((ph->p_flags & PF_W) == 0) 248 *prot |= (ph->p_flags & PF_X) ? PROT_EXEC : 0; 249 250 msize = ph->p_memsz + diff; 251 offset = ph->p_offset - bdiff; 252 lsize = ph->p_filesz + bdiff; 253 psize = round_page(lsize); 254 255 /* 256 * Because the pagedvn pager can't handle zero fill of the last 257 * data page if it's not page aligned we map the last page readvn. 258 */ 259 if (ph->p_flags & PF_W) { 260 psize = trunc_page(lsize); 261 if (psize > 0) 262 NEW_VMCMD2(vcset, vmcmd_map_pagedvn, psize, base, vp, 263 offset, *prot, flags); 264 if (psize != lsize) { 265 NEW_VMCMD2(vcset, vmcmd_map_readvn, lsize - psize, 266 base + psize, vp, offset + psize, *prot, flags); 267 } 268 } else { 269 NEW_VMCMD2(vcset, vmcmd_map_pagedvn, psize, base, vp, offset, 270 *prot, flags); 271 } 272 273 /* 274 * Check if we need to extend the size of the segment 275 */ 276 rm = round_page(*addr + ph->p_memsz + diff); 277 rf = round_page(*addr + ph->p_filesz + diff); 278 279 if (rm != rf) { 280 NEW_VMCMD2(vcset, vmcmd_map_zero, rm - rf, rf, NULLVP, 0, 281 *prot, flags); 282 } 283 *size = msize; 284 } 285 286 /* 287 * Read from vnode into buffer at offset. 288 */ 289 int 290 elf_read_from(struct proc *p, struct vnode *vp, u_long off, void *buf, 291 int size) 292 { 293 int error; 294 size_t resid; 295 296 if ((error = vn_rdwr(UIO_READ, vp, buf, size, off, UIO_SYSSPACE, 297 0, p->p_ucred, &resid, p)) != 0) 298 return error; 299 /* 300 * See if we got all of it 301 */ 302 if (resid != 0) 303 return (ENOEXEC); 304 return (0); 305 } 306 307 /* 308 * Load a file (interpreter/library) pointed to by path [stolen from 309 * coff_load_shlib()]. Made slightly generic so it might be used externally. 310 */ 311 int 312 elf_load_file(struct proc *p, char *path, struct exec_package *epp, 313 struct elf_args *ap) 314 { 315 int error, i; 316 struct nameidata nd; 317 Elf_Ehdr eh; 318 Elf_Phdr *ph = NULL; 319 u_long phsize = 0; 320 Elf_Addr addr; 321 struct vnode *vp; 322 Elf_Phdr *base_ph = NULL; 323 struct interp_ld_sec { 324 Elf_Addr vaddr; 325 u_long memsz; 326 } loadmap[ELF_MAX_VALID_PHDR]; 327 int nload, idx = 0; 328 Elf_Addr pos; 329 int file_align; 330 int loop; 331 size_t randomizequota = ELF_RANDOMIZE_LIMIT; 332 333 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, path, p); 334 nd.ni_pledge = PLEDGE_RPATH; 335 if ((error = namei(&nd)) != 0) { 336 return (error); 337 } 338 vp = nd.ni_vp; 339 if (vp->v_type != VREG) { 340 error = EACCES; 341 goto bad; 342 } 343 if ((error = VOP_GETATTR(vp, epp->ep_vap, p->p_ucred, p)) != 0) 344 goto bad; 345 if (vp->v_mount->mnt_flag & MNT_NOEXEC) { 346 error = EACCES; 347 goto bad; 348 } 349 if ((error = VOP_ACCESS(vp, VREAD, p->p_ucred, p)) != 0) 350 goto bad1; 351 if ((error = elf_read_from(p, nd.ni_vp, 0, &eh, sizeof(eh))) != 0) 352 goto bad1; 353 354 if (elf_check_header(&eh) || eh.e_type != ET_DYN) { 355 error = ENOEXEC; 356 goto bad1; 357 } 358 359 ph = mallocarray(eh.e_phnum, sizeof(Elf_Phdr), M_TEMP, M_WAITOK); 360 phsize = eh.e_phnum * sizeof(Elf_Phdr); 361 362 if ((error = elf_read_from(p, nd.ni_vp, eh.e_phoff, ph, phsize)) != 0) 363 goto bad1; 364 365 for (i = 0; i < eh.e_phnum; i++) { 366 if (ph[i].p_type == PT_LOAD) { 367 if (ph[i].p_filesz > ph[i].p_memsz || 368 ph[i].p_memsz == 0) { 369 error = EINVAL; 370 goto bad1; 371 } 372 loadmap[idx].vaddr = trunc_page(ph[i].p_vaddr); 373 loadmap[idx].memsz = round_page (ph[i].p_vaddr + 374 ph[i].p_memsz - loadmap[idx].vaddr); 375 file_align = ph[i].p_align; 376 idx++; 377 } 378 } 379 nload = idx; 380 381 /* 382 * Load the interpreter where a non-fixed mmap(NULL, ...) 383 * would (i.e. something safely out of the way). 384 */ 385 pos = uvm_map_hint(p->p_vmspace, PROT_EXEC, VM_MIN_ADDRESS, 386 VM_MAXUSER_ADDRESS); 387 pos = ELF_ROUND(pos, file_align); 388 389 loop = 0; 390 for (i = 0; i < nload;/**/) { 391 vaddr_t addr; 392 struct uvm_object *uobj; 393 off_t uoff; 394 size_t size; 395 396 #ifdef this_needs_fixing 397 if (i == 0) { 398 uobj = &vp->v_uvm.u_obj; 399 /* need to fix uoff */ 400 } else { 401 #endif 402 uobj = NULL; 403 uoff = 0; 404 #ifdef this_needs_fixing 405 } 406 #endif 407 408 addr = trunc_page(pos + loadmap[i].vaddr); 409 size = round_page(addr + loadmap[i].memsz) - addr; 410 411 /* CRAP - map_findspace does not avoid daddr+BRKSIZ */ 412 if ((addr + size > (vaddr_t)p->p_vmspace->vm_daddr) && 413 (addr < (vaddr_t)p->p_vmspace->vm_daddr + BRKSIZ)) 414 addr = round_page((vaddr_t)p->p_vmspace->vm_daddr + 415 BRKSIZ); 416 417 if (uvm_map_mquery(&p->p_vmspace->vm_map, &addr, size, 418 (i == 0 ? uoff : UVM_UNKNOWN_OFFSET), 0) != 0) { 419 if (loop == 0) { 420 loop = 1; 421 i = 0; 422 pos = 0; 423 continue; 424 } 425 error = ENOMEM; 426 goto bad1; 427 } 428 if (addr != pos + loadmap[i].vaddr) { 429 /* base changed. */ 430 pos = addr - trunc_page(loadmap[i].vaddr); 431 pos = ELF_ROUND(pos,file_align); 432 i = 0; 433 continue; 434 } 435 436 i++; 437 } 438 439 /* 440 * Load all the necessary sections 441 */ 442 for (i = 0; i < eh.e_phnum; i++) { 443 Elf_Addr size = 0; 444 int prot = 0; 445 int flags; 446 447 switch (ph[i].p_type) { 448 case PT_LOAD: 449 if (base_ph == NULL) { 450 flags = VMCMD_BASE; 451 addr = pos; 452 base_ph = &ph[i]; 453 } else { 454 flags = VMCMD_RELATIVE; 455 addr = ph[i].p_vaddr - base_ph->p_vaddr; 456 } 457 elf_load_psection(&epp->ep_vmcmds, nd.ni_vp, 458 &ph[i], &addr, &size, &prot, flags); 459 /* If entry is within this section it must be text */ 460 if (eh.e_entry >= ph[i].p_vaddr && 461 eh.e_entry < (ph[i].p_vaddr + size)) { 462 epp->ep_entry = addr + eh.e_entry - 463 ELF_TRUNC(ph[i].p_vaddr,ph[i].p_align); 464 if (flags == VMCMD_RELATIVE) 465 epp->ep_entry += pos; 466 ap->arg_interp = pos; 467 } 468 addr += size; 469 break; 470 471 case PT_DYNAMIC: 472 case PT_PHDR: 473 case PT_NOTE: 474 break; 475 476 case PT_OPENBSD_RANDOMIZE: 477 if (ph[i].p_memsz > randomizequota) { 478 error = ENOMEM; 479 goto bad1; 480 } 481 randomizequota -= ph[i].p_memsz; 482 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_randomize, 483 ph[i].p_memsz, ph[i].p_vaddr + pos, NULLVP, 0, 0); 484 break; 485 486 default: 487 break; 488 } 489 } 490 491 vn_marktext(nd.ni_vp); 492 493 bad1: 494 VOP_CLOSE(nd.ni_vp, FREAD, p->p_ucred, p); 495 bad: 496 free(ph, M_TEMP, phsize); 497 498 vput(nd.ni_vp); 499 return (error); 500 } 501 502 /* 503 * Prepare an Elf binary's exec package 504 * 505 * First, set of the various offsets/lengths in the exec package. 506 * 507 * Then, mark the text image busy (so it can be demand paged) or error out if 508 * this is not possible. Finally, set up vmcmds for the text, data, bss, and 509 * stack segments. 510 */ 511 int 512 exec_elf_makecmds(struct proc *p, struct exec_package *epp) 513 { 514 Elf_Ehdr *eh = epp->ep_hdr; 515 Elf_Phdr *ph, *pp, *base_ph = NULL; 516 Elf_Addr phdr = 0, exe_base = 0; 517 int error, i, has_phdr = 0; 518 char *interp = NULL; 519 u_long phsize; 520 size_t randomizequota = ELF_RANDOMIZE_LIMIT; 521 522 if (epp->ep_hdrvalid < sizeof(Elf_Ehdr)) 523 return (ENOEXEC); 524 525 if (elf_check_header(eh) || 526 (eh->e_type != ET_EXEC && eh->e_type != ET_DYN)) 527 return (ENOEXEC); 528 529 /* 530 * check if vnode is in open for writing, because we want to demand- 531 * page out of it. if it is, don't do it, for various reasons. 532 */ 533 if (epp->ep_vp->v_writecount != 0) { 534 #ifdef DIAGNOSTIC 535 if (epp->ep_vp->v_flag & VTEXT) 536 panic("exec: a VTEXT vnode has writecount != 0"); 537 #endif 538 return (ETXTBSY); 539 } 540 /* 541 * Allocate space to hold all the program headers, and read them 542 * from the file 543 */ 544 ph = mallocarray(eh->e_phnum, sizeof(Elf_Phdr), M_TEMP, M_WAITOK); 545 phsize = eh->e_phnum * sizeof(Elf_Phdr); 546 547 if ((error = elf_read_from(p, epp->ep_vp, eh->e_phoff, ph, 548 phsize)) != 0) 549 goto bad; 550 551 epp->ep_tsize = ELF_NO_ADDR; 552 epp->ep_dsize = ELF_NO_ADDR; 553 554 for (i = 0, pp = ph; i < eh->e_phnum; i++, pp++) { 555 if (pp->p_type == PT_INTERP && !interp) { 556 if (pp->p_filesz < 2 || pp->p_filesz > MAXPATHLEN) 557 goto bad; 558 interp = pool_get(&namei_pool, PR_WAITOK); 559 if ((error = elf_read_from(p, epp->ep_vp, 560 pp->p_offset, interp, pp->p_filesz)) != 0) { 561 goto bad; 562 } 563 if (interp[pp->p_filesz - 1] != '\0') 564 goto bad; 565 } else if (pp->p_type == PT_LOAD) { 566 if (pp->p_filesz > pp->p_memsz || 567 pp->p_memsz == 0) { 568 error = EINVAL; 569 goto bad; 570 } 571 if (base_ph == NULL) 572 base_ph = pp; 573 } else if (pp->p_type == PT_PHDR) { 574 has_phdr = 1; 575 } 576 } 577 578 if (eh->e_type == ET_DYN) { 579 /* need phdr and load sections for PIE */ 580 if (!has_phdr || base_ph == NULL) { 581 error = EINVAL; 582 goto bad; 583 } 584 /* randomize exe_base for PIE */ 585 exe_base = uvm_map_pie(base_ph->p_align); 586 } 587 588 /* 589 * OK, we want a slightly different twist of the 590 * standard emulation package for "real" elf. 591 */ 592 epp->ep_emul = &emul_elf; 593 594 /* 595 * Verify this is an OpenBSD executable. If it's marked that way 596 * via a PT_NOTE then also check for a PT_OPENBSD_WXNEEDED segment. 597 */ 598 if (eh->e_ident[EI_OSABI] != ELFOSABI_OPENBSD && (error = 599 elf_os_pt_note(p, epp, epp->ep_hdr, "OpenBSD", 8, 4)) != 0) { 600 goto bad; 601 } 602 603 /* 604 * Load all the necessary sections 605 */ 606 for (i = 0, pp = ph; i < eh->e_phnum; i++, pp++) { 607 Elf_Addr addr, size = 0; 608 int prot = 0; 609 int flags = 0; 610 611 switch (pp->p_type) { 612 case PT_LOAD: 613 if (exe_base != 0) { 614 if (pp == base_ph) { 615 flags = VMCMD_BASE; 616 addr = exe_base; 617 } else { 618 flags = VMCMD_RELATIVE; 619 addr = pp->p_vaddr - base_ph->p_vaddr; 620 } 621 } else 622 addr = ELF_NO_ADDR; 623 624 /* 625 * Calculates size of text and data segments 626 * by starting at first and going to end of last. 627 * 'rwx' sections are treated as data. 628 * this is correct for BSS_PLT, but may not be 629 * for DATA_PLT, is fine for TEXT_PLT. 630 */ 631 elf_load_psection(&epp->ep_vmcmds, epp->ep_vp, 632 pp, &addr, &size, &prot, flags); 633 634 /* 635 * Update exe_base in case alignment was off. 636 * For PIE, addr is relative to exe_base so 637 * adjust it (non PIE exe_base is 0 so no change). 638 */ 639 if (flags == VMCMD_BASE) 640 exe_base = addr; 641 else 642 addr += exe_base; 643 644 /* 645 * Decide whether it's text or data by looking 646 * at the protection of the section 647 */ 648 if (prot & PROT_WRITE) { 649 /* data section */ 650 if (epp->ep_dsize == ELF_NO_ADDR) { 651 epp->ep_daddr = addr; 652 epp->ep_dsize = size; 653 } else { 654 if (addr < epp->ep_daddr) { 655 epp->ep_dsize = 656 epp->ep_dsize + 657 epp->ep_daddr - 658 addr; 659 epp->ep_daddr = addr; 660 } else 661 epp->ep_dsize = addr+size - 662 epp->ep_daddr; 663 } 664 } else if (prot & PROT_EXEC) { 665 /* text section */ 666 if (epp->ep_tsize == ELF_NO_ADDR) { 667 epp->ep_taddr = addr; 668 epp->ep_tsize = size; 669 } else { 670 if (addr < epp->ep_taddr) { 671 epp->ep_tsize = 672 epp->ep_tsize + 673 epp->ep_taddr - 674 addr; 675 epp->ep_taddr = addr; 676 } else 677 epp->ep_tsize = addr+size - 678 epp->ep_taddr; 679 } 680 } 681 break; 682 683 case PT_SHLIB: 684 error = ENOEXEC; 685 goto bad; 686 687 case PT_INTERP: 688 /* Already did this one */ 689 case PT_DYNAMIC: 690 case PT_NOTE: 691 break; 692 693 case PT_PHDR: 694 /* Note address of program headers (in text segment) */ 695 phdr = pp->p_vaddr; 696 break; 697 698 case PT_OPENBSD_RANDOMIZE: 699 if (ph[i].p_memsz > randomizequota) { 700 error = ENOMEM; 701 goto bad; 702 } 703 randomizequota -= ph[i].p_memsz; 704 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_randomize, 705 ph[i].p_memsz, ph[i].p_vaddr + exe_base, NULLVP, 0, 0); 706 break; 707 708 default: 709 /* 710 * Not fatal, we don't need to understand everything 711 * :-) 712 */ 713 break; 714 } 715 } 716 717 phdr += exe_base; 718 719 /* 720 * Strangely some linux programs may have all load sections marked 721 * writeable, in this case, textsize is not -1, but rather 0; 722 */ 723 if (epp->ep_tsize == ELF_NO_ADDR) 724 epp->ep_tsize = 0; 725 /* 726 * Another possibility is that it has all load sections marked 727 * read-only. Fake a zero-sized data segment right after the 728 * text segment. 729 */ 730 if (epp->ep_dsize == ELF_NO_ADDR) { 731 epp->ep_daddr = round_page(epp->ep_taddr + epp->ep_tsize); 732 epp->ep_dsize = 0; 733 } 734 735 epp->ep_interp = interp; 736 epp->ep_entry = eh->e_entry + exe_base; 737 738 /* 739 * Check if we found a dynamically linked binary and arrange to load 740 * its interpreter when the exec file is released. 741 */ 742 if (interp || eh->e_type == ET_DYN) { 743 struct elf_args *ap; 744 745 ap = malloc(sizeof(*ap), M_TEMP, M_WAITOK); 746 747 ap->arg_phaddr = phdr; 748 ap->arg_phentsize = eh->e_phentsize; 749 ap->arg_phnum = eh->e_phnum; 750 ap->arg_entry = eh->e_entry + exe_base; 751 ap->arg_interp = exe_base; 752 753 epp->ep_emul_arg = ap; 754 epp->ep_emul_argsize = sizeof *ap; 755 } 756 757 free(ph, M_TEMP, phsize); 758 vn_marktext(epp->ep_vp); 759 return (exec_setup_stack(p, epp)); 760 761 bad: 762 if (interp) 763 pool_put(&namei_pool, interp); 764 free(ph, M_TEMP, phsize); 765 kill_vmcmds(&epp->ep_vmcmds); 766 if (error == 0) 767 return (ENOEXEC); 768 return (error); 769 } 770 771 /* 772 * Phase II of load. It is now safe to load the interpreter. Info collected 773 * when loading the program is available for setup of the interpreter. 774 */ 775 int 776 exec_elf_fixup(struct proc *p, struct exec_package *epp) 777 { 778 char *interp; 779 int error = 0; 780 struct elf_args *ap; 781 AuxInfo ai[ELF_AUX_ENTRIES], *a; 782 783 if (epp->ep_emul_arg == NULL) { 784 return (0); 785 } 786 787 interp = epp->ep_interp; 788 ap = epp->ep_emul_arg; 789 790 if (interp && 791 (error = elf_load_file(p, interp, epp, ap)) != 0) { 792 free(ap, M_TEMP, epp->ep_emul_argsize); 793 pool_put(&namei_pool, interp); 794 kill_vmcmds(&epp->ep_vmcmds); 795 return (error); 796 } 797 /* 798 * We have to do this ourselves... 799 */ 800 error = exec_process_vmcmds(p, epp); 801 802 /* 803 * Push extra arguments on the stack needed by dynamically 804 * linked binaries 805 */ 806 if (error == 0) { 807 memset(&ai, 0, sizeof ai); 808 a = ai; 809 810 a->au_id = AUX_phdr; 811 a->au_v = ap->arg_phaddr; 812 a++; 813 814 a->au_id = AUX_phent; 815 a->au_v = ap->arg_phentsize; 816 a++; 817 818 a->au_id = AUX_phnum; 819 a->au_v = ap->arg_phnum; 820 a++; 821 822 a->au_id = AUX_pagesz; 823 a->au_v = PAGE_SIZE; 824 a++; 825 826 a->au_id = AUX_base; 827 a->au_v = ap->arg_interp; 828 a++; 829 830 a->au_id = AUX_flags; 831 a->au_v = 0; 832 a++; 833 834 a->au_id = AUX_entry; 835 a->au_v = ap->arg_entry; 836 a++; 837 838 a->au_id = AUX_null; 839 a->au_v = 0; 840 a++; 841 842 error = copyout(ai, epp->ep_emul_argp, sizeof ai); 843 } 844 free(ap, M_TEMP, epp->ep_emul_argsize); 845 if (interp) 846 pool_put(&namei_pool, interp); 847 return (error); 848 } 849 850 int 851 elf_os_pt_note(struct proc *p, struct exec_package *epp, Elf_Ehdr *eh, 852 char *os_name, size_t name_size, size_t desc_size) 853 { 854 char pathbuf[MAXPATHLEN]; 855 Elf_Phdr *hph, *ph; 856 Elf_Note *np = NULL; 857 size_t phsize; 858 int error; 859 860 hph = mallocarray(eh->e_phnum, sizeof(Elf_Phdr), M_TEMP, M_WAITOK); 861 phsize = eh->e_phnum * sizeof(Elf_Phdr); 862 if ((error = elf_read_from(p, epp->ep_vp, eh->e_phoff, 863 hph, phsize)) != 0) 864 goto out1; 865 866 for (ph = hph; ph < &hph[eh->e_phnum]; ph++) { 867 if (ph->p_type == PT_OPENBSD_WXNEEDED) { 868 int wxallowed = (epp->ep_vp->v_mount && 869 (epp->ep_vp->v_mount->mnt_flag & MNT_WXALLOWED)); 870 871 if (!wxallowed) { 872 error = copyinstr(epp->ep_name, &pathbuf, 873 sizeof(pathbuf), NULL); 874 log(LOG_NOTICE, 875 "%s(%d): W^X binary outside wxallowed mountpoint\n", 876 error ? "" : pathbuf, p->p_p->ps_pid); 877 error = EACCES; 878 goto out1; 879 } 880 epp->ep_flags |= EXEC_WXNEEDED; 881 break; 882 } 883 } 884 885 for (ph = hph; ph < &hph[eh->e_phnum]; ph++) { 886 if (ph->p_type != PT_NOTE || 887 ph->p_filesz > 1024 || 888 ph->p_filesz < sizeof(Elf_Note) + name_size) 889 continue; 890 891 np = malloc(ph->p_filesz, M_TEMP, M_WAITOK); 892 if ((error = elf_read_from(p, epp->ep_vp, ph->p_offset, 893 np, ph->p_filesz)) != 0) 894 goto out2; 895 896 #if 0 897 if (np->type != ELF_NOTE_TYPE_OSVERSION) { 898 free(np, M_TEMP, ph->p_filesz); 899 np = NULL; 900 continue; 901 } 902 #endif 903 904 /* Check the name and description sizes. */ 905 if (np->namesz != name_size || 906 np->descsz != desc_size) 907 goto out3; 908 909 if (memcmp((np + 1), os_name, name_size)) 910 goto out3; 911 912 /* XXX: We could check for the specific emulation here */ 913 /* All checks succeeded. */ 914 error = 0; 915 goto out2; 916 } 917 918 out3: 919 error = ENOEXEC; 920 out2: 921 free(np, M_TEMP, ph->p_filesz); 922 out1: 923 free(hph, M_TEMP, phsize); 924 return error; 925 } 926 927 /* 928 * Start of routines related to dumping core 929 */ 930 931 #ifdef SMALL_KERNEL 932 int 933 coredump_elf(struct proc *p, void *cookie) 934 { 935 return EPERM; 936 } 937 #else /* !SMALL_KERNEL */ 938 939 struct writesegs_state { 940 off_t notestart; 941 off_t secstart; 942 off_t secoff; 943 struct proc *p; 944 void *iocookie; 945 Elf_Phdr *psections; 946 size_t psectionslen; 947 size_t notesize; 948 int npsections; 949 }; 950 951 uvm_coredump_setup_cb coredump_setup_elf; 952 uvm_coredump_walk_cb coredump_walk_elf; 953 954 int coredump_notes_elf(struct proc *, void *, size_t *); 955 int coredump_note_elf(struct proc *, void *, size_t *); 956 int coredump_writenote_elf(struct proc *, void *, Elf_Note *, 957 const char *, void *); 958 959 #define ELFROUNDSIZE 4 /* XXX Should it be sizeof(Elf_Word)? */ 960 #define elfround(x) roundup((x), ELFROUNDSIZE) 961 962 int 963 coredump_elf(struct proc *p, void *cookie) 964 { 965 #ifdef DIAGNOSTIC 966 off_t offset; 967 #endif 968 struct writesegs_state ws; 969 size_t notesize; 970 int error, i; 971 972 ws.p = p; 973 ws.iocookie = cookie; 974 ws.psections = NULL; 975 976 /* 977 * Walk the map to get all the segment offsets and lengths, 978 * write out the ELF header. 979 */ 980 error = uvm_coredump_walkmap(p, coredump_setup_elf, 981 coredump_walk_elf, &ws); 982 if (error) 983 goto out; 984 985 error = coredump_write(cookie, UIO_SYSSPACE, ws.psections, 986 ws.psectionslen); 987 if (error) 988 goto out; 989 990 /* Write out the notes. */ 991 error = coredump_notes_elf(p, cookie, ¬esize); 992 if (error) 993 goto out; 994 995 #ifdef DIAGNOSTIC 996 if (notesize != ws.notesize) 997 panic("coredump: notesize changed: %zu != %zu", 998 ws.notesize, notesize); 999 offset = ws.notestart + notesize; 1000 if (offset != ws.secstart) 1001 panic("coredump: offset %lld != secstart %lld", 1002 (long long) offset, (long long) ws.secstart); 1003 #endif 1004 1005 /* Pass 3: finally, write the sections themselves. */ 1006 for (i = 0; i < ws.npsections - 1; i++) { 1007 Elf_Phdr *pent = &ws.psections[i]; 1008 if (pent->p_filesz == 0) 1009 continue; 1010 1011 #ifdef DIAGNOSTIC 1012 if (offset != pent->p_offset) 1013 panic("coredump: offset %lld != p_offset[%d] %lld", 1014 (long long) offset, i, 1015 (long long) pent->p_filesz); 1016 #endif 1017 1018 error = coredump_write(cookie, UIO_USERSPACE, 1019 (void *)(vaddr_t)pent->p_vaddr, pent->p_filesz); 1020 if (error) 1021 goto out; 1022 1023 coredump_unmap(cookie, (vaddr_t)pent->p_vaddr, 1024 (vaddr_t)pent->p_vaddr + pent->p_filesz); 1025 1026 #ifdef DIAGNOSTIC 1027 offset += ws.psections[i].p_filesz; 1028 #endif 1029 } 1030 1031 out: 1032 free(ws.psections, M_TEMP, ws.psectionslen); 1033 return (error); 1034 } 1035 1036 1037 1038 int 1039 coredump_setup_elf(int segment_count, void *cookie) 1040 { 1041 Elf_Ehdr ehdr; 1042 struct writesegs_state *ws = cookie; 1043 Elf_Phdr *note; 1044 int error; 1045 1046 /* Get the count of segments, plus one for the PT_NOTE */ 1047 ws->npsections = segment_count + 1; 1048 1049 /* Get the size of the notes. */ 1050 error = coredump_notes_elf(ws->p, NULL, &ws->notesize); 1051 if (error) 1052 return error; 1053 1054 /* Setup the ELF header */ 1055 memset(&ehdr, 0, sizeof(ehdr)); 1056 memcpy(ehdr.e_ident, ELFMAG, SELFMAG); 1057 ehdr.e_ident[EI_CLASS] = ELF_TARG_CLASS; 1058 ehdr.e_ident[EI_DATA] = ELF_TARG_DATA; 1059 ehdr.e_ident[EI_VERSION] = EV_CURRENT; 1060 /* XXX Should be the OSABI/ABI version of the executable. */ 1061 ehdr.e_ident[EI_OSABI] = ELFOSABI_SYSV; 1062 ehdr.e_ident[EI_ABIVERSION] = 0; 1063 ehdr.e_type = ET_CORE; 1064 /* XXX This should be the e_machine of the executable. */ 1065 ehdr.e_machine = ELF_TARG_MACH; 1066 ehdr.e_version = EV_CURRENT; 1067 ehdr.e_entry = 0; 1068 ehdr.e_phoff = sizeof(ehdr); 1069 ehdr.e_shoff = 0; 1070 ehdr.e_flags = 0; 1071 ehdr.e_ehsize = sizeof(ehdr); 1072 ehdr.e_phentsize = sizeof(Elf_Phdr); 1073 ehdr.e_phnum = ws->npsections; 1074 ehdr.e_shentsize = 0; 1075 ehdr.e_shnum = 0; 1076 ehdr.e_shstrndx = 0; 1077 1078 /* Write out the ELF header. */ 1079 error = coredump_write(ws->iocookie, UIO_SYSSPACE, &ehdr, sizeof(ehdr)); 1080 if (error) 1081 return error; 1082 1083 /* 1084 * Allocate the segment header array and setup to collect 1085 * the section sizes and offsets 1086 */ 1087 ws->psections = mallocarray(ws->npsections, sizeof(Elf_Phdr), 1088 M_TEMP, M_WAITOK|M_ZERO); 1089 ws->psectionslen = ws->npsections * sizeof(Elf_Phdr); 1090 1091 ws->notestart = sizeof(ehdr) + ws->psectionslen; 1092 ws->secstart = ws->notestart + ws->notesize; 1093 ws->secoff = ws->secstart; 1094 1095 /* Fill in the PT_NOTE segment header in the last slot */ 1096 note = &ws->psections[ws->npsections - 1]; 1097 note->p_type = PT_NOTE; 1098 note->p_offset = ws->notestart; 1099 note->p_vaddr = 0; 1100 note->p_paddr = 0; 1101 note->p_filesz = ws->notesize; 1102 note->p_memsz = 0; 1103 note->p_flags = PF_R; 1104 note->p_align = ELFROUNDSIZE; 1105 1106 return (0); 1107 } 1108 1109 int 1110 coredump_walk_elf(vaddr_t start, vaddr_t realend, vaddr_t end, vm_prot_t prot, 1111 int nsegment, void *cookie) 1112 { 1113 struct writesegs_state *ws = cookie; 1114 Elf_Phdr phdr; 1115 vsize_t size, realsize; 1116 1117 size = end - start; 1118 realsize = realend - start; 1119 1120 phdr.p_type = PT_LOAD; 1121 phdr.p_offset = ws->secoff; 1122 phdr.p_vaddr = start; 1123 phdr.p_paddr = 0; 1124 phdr.p_filesz = realsize; 1125 phdr.p_memsz = size; 1126 phdr.p_flags = 0; 1127 if (prot & PROT_READ) 1128 phdr.p_flags |= PF_R; 1129 if (prot & PROT_WRITE) 1130 phdr.p_flags |= PF_W; 1131 if (prot & PROT_EXEC) 1132 phdr.p_flags |= PF_X; 1133 phdr.p_align = PAGE_SIZE; 1134 1135 ws->secoff += phdr.p_filesz; 1136 ws->psections[nsegment] = phdr; 1137 1138 return (0); 1139 } 1140 1141 int 1142 coredump_notes_elf(struct proc *p, void *iocookie, size_t *sizep) 1143 { 1144 struct ps_strings pss; 1145 struct iovec iov; 1146 struct uio uio; 1147 struct elfcore_procinfo cpi; 1148 Elf_Note nhdr; 1149 struct process *pr = p->p_p; 1150 struct proc *q; 1151 size_t size, notesize; 1152 int error; 1153 1154 size = 0; 1155 1156 /* First, write an elfcore_procinfo. */ 1157 notesize = sizeof(nhdr) + elfround(sizeof("OpenBSD")) + 1158 elfround(sizeof(cpi)); 1159 if (iocookie) { 1160 memset(&cpi, 0, sizeof(cpi)); 1161 1162 cpi.cpi_version = ELFCORE_PROCINFO_VERSION; 1163 cpi.cpi_cpisize = sizeof(cpi); 1164 cpi.cpi_signo = p->p_sisig; 1165 cpi.cpi_sigcode = p->p_sicode; 1166 1167 cpi.cpi_sigpend = p->p_siglist; 1168 cpi.cpi_sigmask = p->p_sigmask; 1169 cpi.cpi_sigignore = pr->ps_sigacts->ps_sigignore; 1170 cpi.cpi_sigcatch = pr->ps_sigacts->ps_sigcatch; 1171 1172 cpi.cpi_pid = pr->ps_pid; 1173 cpi.cpi_ppid = pr->ps_pptr->ps_pid; 1174 cpi.cpi_pgrp = pr->ps_pgid; 1175 if (pr->ps_session->s_leader) 1176 cpi.cpi_sid = pr->ps_session->s_leader->ps_pid; 1177 else 1178 cpi.cpi_sid = 0; 1179 1180 cpi.cpi_ruid = p->p_ucred->cr_ruid; 1181 cpi.cpi_euid = p->p_ucred->cr_uid; 1182 cpi.cpi_svuid = p->p_ucred->cr_svuid; 1183 1184 cpi.cpi_rgid = p->p_ucred->cr_rgid; 1185 cpi.cpi_egid = p->p_ucred->cr_gid; 1186 cpi.cpi_svgid = p->p_ucred->cr_svgid; 1187 1188 (void)strlcpy(cpi.cpi_name, pr->ps_comm, sizeof(cpi.cpi_name)); 1189 1190 nhdr.namesz = sizeof("OpenBSD"); 1191 nhdr.descsz = sizeof(cpi); 1192 nhdr.type = NT_OPENBSD_PROCINFO; 1193 1194 error = coredump_writenote_elf(p, iocookie, &nhdr, 1195 "OpenBSD", &cpi); 1196 if (error) 1197 return (error); 1198 } 1199 size += notesize; 1200 1201 /* Second, write an NT_OPENBSD_AUXV note. */ 1202 notesize = sizeof(nhdr) + elfround(sizeof("OpenBSD")) + 1203 elfround(pr->ps_emul->e_arglen * sizeof(char *)); 1204 if (iocookie) { 1205 iov.iov_base = &pss; 1206 iov.iov_len = sizeof(pss); 1207 uio.uio_iov = &iov; 1208 uio.uio_iovcnt = 1; 1209 uio.uio_offset = (off_t)pr->ps_strings; 1210 uio.uio_resid = sizeof(pss); 1211 uio.uio_segflg = UIO_SYSSPACE; 1212 uio.uio_rw = UIO_READ; 1213 uio.uio_procp = NULL; 1214 1215 error = uvm_io(&p->p_vmspace->vm_map, &uio, 0); 1216 if (error) 1217 return (error); 1218 1219 if (pss.ps_envstr == NULL) 1220 return (EIO); 1221 1222 nhdr.namesz = sizeof("OpenBSD"); 1223 nhdr.descsz = pr->ps_emul->e_arglen * sizeof(char *); 1224 nhdr.type = NT_OPENBSD_AUXV; 1225 1226 error = coredump_write(iocookie, UIO_SYSSPACE, 1227 &nhdr, sizeof(nhdr)); 1228 if (error) 1229 return (error); 1230 1231 error = coredump_write(iocookie, UIO_SYSSPACE, 1232 "OpenBSD", elfround(nhdr.namesz)); 1233 if (error) 1234 return (error); 1235 1236 error = coredump_write(iocookie, UIO_USERSPACE, 1237 pss.ps_envstr + pss.ps_nenvstr + 1, nhdr.descsz); 1238 if (error) 1239 return (error); 1240 } 1241 size += notesize; 1242 1243 #ifdef PT_WCOOKIE 1244 notesize = sizeof(nhdr) + elfround(sizeof("OpenBSD")) + 1245 elfround(sizeof(register_t)); 1246 if (iocookie) { 1247 register_t wcookie; 1248 1249 nhdr.namesz = sizeof("OpenBSD"); 1250 nhdr.descsz = sizeof(register_t); 1251 nhdr.type = NT_OPENBSD_WCOOKIE; 1252 1253 wcookie = process_get_wcookie(p); 1254 error = coredump_writenote_elf(p, iocookie, &nhdr, 1255 "OpenBSD", &wcookie); 1256 if (error) 1257 return (error); 1258 } 1259 size += notesize; 1260 #endif 1261 1262 /* 1263 * Now write the register info for the thread that caused the 1264 * coredump. 1265 */ 1266 error = coredump_note_elf(p, iocookie, ¬esize); 1267 if (error) 1268 return (error); 1269 size += notesize; 1270 1271 /* 1272 * Now, for each thread, write the register info and any other 1273 * per-thread notes. Since we're dumping core, all the other 1274 * threads in the process have been stopped and the list can't 1275 * change. 1276 */ 1277 TAILQ_FOREACH(q, &pr->ps_threads, p_thr_link) { 1278 if (q == p) /* we've taken care of this thread */ 1279 continue; 1280 error = coredump_note_elf(q, iocookie, ¬esize); 1281 if (error) 1282 return (error); 1283 size += notesize; 1284 } 1285 1286 *sizep = size; 1287 return (0); 1288 } 1289 1290 int 1291 coredump_note_elf(struct proc *p, void *iocookie, size_t *sizep) 1292 { 1293 Elf_Note nhdr; 1294 int size, notesize, error; 1295 int namesize; 1296 char name[64+ELFROUNDSIZE]; 1297 struct reg intreg; 1298 #ifdef PT_GETFPREGS 1299 struct fpreg freg; 1300 #endif 1301 1302 size = 0; 1303 1304 snprintf(name, sizeof(name)-ELFROUNDSIZE, "%s@%d", 1305 "OpenBSD", p->p_tid + THREAD_PID_OFFSET); 1306 namesize = strlen(name) + 1; 1307 memset(name + namesize, 0, elfround(namesize) - namesize); 1308 1309 notesize = sizeof(nhdr) + elfround(namesize) + elfround(sizeof(intreg)); 1310 if (iocookie) { 1311 error = process_read_regs(p, &intreg); 1312 if (error) 1313 return (error); 1314 1315 nhdr.namesz = namesize; 1316 nhdr.descsz = sizeof(intreg); 1317 nhdr.type = NT_OPENBSD_REGS; 1318 1319 error = coredump_writenote_elf(p, iocookie, &nhdr, 1320 name, &intreg); 1321 if (error) 1322 return (error); 1323 1324 } 1325 size += notesize; 1326 1327 #ifdef PT_GETFPREGS 1328 notesize = sizeof(nhdr) + elfround(namesize) + elfround(sizeof(freg)); 1329 if (iocookie) { 1330 error = process_read_fpregs(p, &freg); 1331 if (error) 1332 return (error); 1333 1334 nhdr.namesz = namesize; 1335 nhdr.descsz = sizeof(freg); 1336 nhdr.type = NT_OPENBSD_FPREGS; 1337 1338 error = coredump_writenote_elf(p, iocookie, &nhdr, name, &freg); 1339 if (error) 1340 return (error); 1341 } 1342 size += notesize; 1343 #endif 1344 1345 *sizep = size; 1346 /* XXX Add hook for machdep per-LWP notes. */ 1347 return (0); 1348 } 1349 1350 int 1351 coredump_writenote_elf(struct proc *p, void *cookie, Elf_Note *nhdr, 1352 const char *name, void *data) 1353 { 1354 int error; 1355 1356 error = coredump_write(cookie, UIO_SYSSPACE, nhdr, sizeof(*nhdr)); 1357 if (error) 1358 return error; 1359 1360 error = coredump_write(cookie, UIO_SYSSPACE, name, 1361 elfround(nhdr->namesz)); 1362 if (error) 1363 return error; 1364 1365 return coredump_write(cookie, UIO_SYSSPACE, data, nhdr->descsz); 1366 } 1367 #endif /* !SMALL_KERNEL */ 1368