1 /* $OpenBSD: exec_elf.c,v 1.137 2017/02/08 21:04:44 guenther 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/file.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 sendsig, 136 SYS_syscall, 137 SYS_MAXSYSCALL, 138 sysent, 139 #ifdef SYSCALL_DEBUG 140 syscallnames, 141 #else 142 NULL, 143 #endif 144 (sizeof(AuxInfo) * ELF_AUX_ENTRIES / sizeof(char *)), 145 elf_copyargs, 146 setregs, 147 exec_elf_fixup, 148 coredump_elf, 149 sigcode, 150 esigcode, 151 sigcoderet, 152 EMUL_ENABLED | EMUL_NATIVE, 153 }; 154 155 /* 156 * Copy arguments onto the stack in the normal way, but add some 157 * space for extra information in case of dynamic binding. 158 */ 159 void * 160 elf_copyargs(struct exec_package *pack, struct ps_strings *arginfo, 161 void *stack, void *argp) 162 { 163 stack = copyargs(pack, arginfo, stack, argp); 164 if (!stack) 165 return (NULL); 166 167 /* 168 * Push space for extra arguments on the stack needed by 169 * dynamically linked binaries. 170 */ 171 if (pack->ep_emul_arg != NULL) { 172 pack->ep_emul_argp = stack; 173 stack = (char *)stack + ELF_AUX_ENTRIES * sizeof (AuxInfo); 174 } 175 return (stack); 176 } 177 178 /* 179 * Check header for validity; return 0 for ok, ENOEXEC if error 180 */ 181 int 182 elf_check_header(Elf_Ehdr *ehdr) 183 { 184 /* 185 * We need to check magic, class size, endianess, and version before 186 * we look at the rest of the Elf_Ehdr structure. These few elements 187 * are represented in a machine independent fashion. 188 */ 189 if (!IS_ELF(*ehdr) || 190 ehdr->e_ident[EI_CLASS] != ELF_TARG_CLASS || 191 ehdr->e_ident[EI_DATA] != ELF_TARG_DATA || 192 ehdr->e_ident[EI_VERSION] != ELF_TARG_VER) 193 return (ENOEXEC); 194 195 /* Now check the machine dependent header */ 196 if (ehdr->e_machine != ELF_TARG_MACH || 197 ehdr->e_version != ELF_TARG_VER) 198 return (ENOEXEC); 199 200 /* Don't allow an insane amount of sections. */ 201 if (ehdr->e_phnum > ELF_MAX_VALID_PHDR) 202 return (ENOEXEC); 203 204 return (0); 205 } 206 207 /* 208 * Load a psection at the appropriate address 209 */ 210 void 211 elf_load_psection(struct exec_vmcmd_set *vcset, struct vnode *vp, 212 Elf_Phdr *ph, Elf_Addr *addr, Elf_Addr *size, int *prot, int flags) 213 { 214 u_long msize, lsize, psize, rm, rf; 215 long diff, offset, bdiff; 216 Elf_Addr base; 217 218 /* 219 * If the user specified an address, then we load there. 220 */ 221 if (*addr != ELF_NO_ADDR) { 222 if (ph->p_align > 1) { 223 *addr = ELF_TRUNC(*addr, ph->p_align); 224 diff = ph->p_vaddr - ELF_TRUNC(ph->p_vaddr, ph->p_align); 225 /* page align vaddr */ 226 base = *addr + trunc_page(ph->p_vaddr) 227 - ELF_TRUNC(ph->p_vaddr, ph->p_align); 228 } else { 229 diff = 0; 230 base = *addr + trunc_page(ph->p_vaddr) - ph->p_vaddr; 231 } 232 } else { 233 *addr = ph->p_vaddr; 234 if (ph->p_align > 1) 235 *addr = ELF_TRUNC(*addr, ph->p_align); 236 base = trunc_page(ph->p_vaddr); 237 diff = ph->p_vaddr - *addr; 238 } 239 bdiff = ph->p_vaddr - trunc_page(ph->p_vaddr); 240 241 /* 242 * Enforce W^X and map W|X segments without X permission 243 * initially. The dynamic linker will make these read-only 244 * and add back X permission after relocation processing. 245 * Static executables with W|X segments will probably crash. 246 */ 247 *prot |= (ph->p_flags & PF_R) ? PROT_READ : 0; 248 *prot |= (ph->p_flags & PF_W) ? PROT_WRITE : 0; 249 if ((ph->p_flags & PF_W) == 0) 250 *prot |= (ph->p_flags & PF_X) ? PROT_EXEC : 0; 251 252 msize = ph->p_memsz + diff; 253 offset = ph->p_offset - bdiff; 254 lsize = ph->p_filesz + bdiff; 255 psize = round_page(lsize); 256 257 /* 258 * Because the pagedvn pager can't handle zero fill of the last 259 * data page if it's not page aligned we map the last page readvn. 260 */ 261 if (ph->p_flags & PF_W) { 262 psize = trunc_page(lsize); 263 if (psize > 0) 264 NEW_VMCMD2(vcset, vmcmd_map_pagedvn, psize, base, vp, 265 offset, *prot, flags); 266 if (psize != lsize) { 267 NEW_VMCMD2(vcset, vmcmd_map_readvn, lsize - psize, 268 base + psize, vp, offset + psize, *prot, flags); 269 } 270 } else { 271 NEW_VMCMD2(vcset, vmcmd_map_pagedvn, psize, base, vp, offset, 272 *prot, flags); 273 } 274 275 /* 276 * Check if we need to extend the size of the segment 277 */ 278 rm = round_page(*addr + ph->p_memsz + diff); 279 rf = round_page(*addr + ph->p_filesz + diff); 280 281 if (rm != rf) { 282 NEW_VMCMD2(vcset, vmcmd_map_zero, rm - rf, rf, NULLVP, 0, 283 *prot, flags); 284 } 285 *size = msize; 286 } 287 288 /* 289 * Read from vnode into buffer at offset. 290 */ 291 int 292 elf_read_from(struct proc *p, struct vnode *vp, u_long off, void *buf, 293 int size) 294 { 295 int error; 296 size_t resid; 297 298 if ((error = vn_rdwr(UIO_READ, vp, buf, size, off, UIO_SYSSPACE, 299 0, p->p_ucred, &resid, p)) != 0) 300 return error; 301 /* 302 * See if we got all of it 303 */ 304 if (resid != 0) 305 return (ENOEXEC); 306 return (0); 307 } 308 309 /* 310 * Load a file (interpreter/library) pointed to by path [stolen from 311 * coff_load_shlib()]. Made slightly generic so it might be used externally. 312 */ 313 int 314 elf_load_file(struct proc *p, char *path, struct exec_package *epp, 315 struct elf_args *ap) 316 { 317 int error, i; 318 struct nameidata nd; 319 Elf_Ehdr eh; 320 Elf_Phdr *ph = NULL; 321 u_long phsize; 322 Elf_Addr addr; 323 struct vnode *vp; 324 Elf_Phdr *base_ph = NULL; 325 struct interp_ld_sec { 326 Elf_Addr vaddr; 327 u_long memsz; 328 } loadmap[ELF_MAX_VALID_PHDR]; 329 int nload, idx = 0; 330 Elf_Addr pos; 331 int file_align; 332 int loop; 333 size_t randomizequota = ELF_RANDOMIZE_LIMIT; 334 335 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, path, p); 336 nd.ni_pledge = PLEDGE_RPATH; 337 if ((error = namei(&nd)) != 0) { 338 return (error); 339 } 340 vp = nd.ni_vp; 341 if (vp->v_type != VREG) { 342 error = EACCES; 343 goto bad; 344 } 345 if ((error = VOP_GETATTR(vp, epp->ep_vap, p->p_ucred, p)) != 0) 346 goto bad; 347 if (vp->v_mount->mnt_flag & MNT_NOEXEC) { 348 error = EACCES; 349 goto bad; 350 } 351 if ((error = VOP_ACCESS(vp, VREAD, p->p_ucred, p)) != 0) 352 goto bad1; 353 if ((error = elf_read_from(p, nd.ni_vp, 0, &eh, sizeof(eh))) != 0) 354 goto bad1; 355 356 if (elf_check_header(&eh) || eh.e_type != ET_DYN) { 357 error = ENOEXEC; 358 goto bad1; 359 } 360 361 ph = mallocarray(eh.e_phnum, sizeof(Elf_Phdr), M_TEMP, M_WAITOK); 362 phsize = eh.e_phnum * sizeof(Elf_Phdr); 363 364 if ((error = elf_read_from(p, nd.ni_vp, eh.e_phoff, ph, phsize)) != 0) 365 goto bad1; 366 367 for (i = 0; i < eh.e_phnum; i++) { 368 if (ph[i].p_type == PT_LOAD) { 369 if (ph[i].p_filesz > ph[i].p_memsz) 370 goto bad1; 371 loadmap[idx].vaddr = trunc_page(ph[i].p_vaddr); 372 loadmap[idx].memsz = round_page (ph[i].p_vaddr + 373 ph[i].p_memsz - loadmap[idx].vaddr); 374 file_align = ph[i].p_align; 375 idx++; 376 } 377 } 378 nload = idx; 379 380 /* 381 * Load the interpreter where a non-fixed mmap(NULL, ...) 382 * would (i.e. something safely out of the way). 383 */ 384 pos = uvm_map_hint(p->p_vmspace, PROT_EXEC, VM_MIN_ADDRESS, 385 VM_MAXUSER_ADDRESS); 386 pos = ELF_ROUND(pos, file_align); 387 388 loop = 0; 389 for (i = 0; i < nload;/**/) { 390 vaddr_t addr; 391 struct uvm_object *uobj; 392 off_t uoff; 393 size_t size; 394 395 #ifdef this_needs_fixing 396 if (i == 0) { 397 uobj = &vp->v_uvm.u_obj; 398 /* need to fix uoff */ 399 } else { 400 #endif 401 uobj = NULL; 402 uoff = 0; 403 #ifdef this_needs_fixing 404 } 405 #endif 406 407 addr = trunc_page(pos + loadmap[i].vaddr); 408 size = round_page(addr + loadmap[i].memsz) - addr; 409 410 /* CRAP - map_findspace does not avoid daddr+BRKSIZ */ 411 if ((addr + size > (vaddr_t)p->p_vmspace->vm_daddr) && 412 (addr < (vaddr_t)p->p_vmspace->vm_daddr + BRKSIZ)) 413 addr = round_page((vaddr_t)p->p_vmspace->vm_daddr + 414 BRKSIZ); 415 416 if (uvm_map_mquery(&p->p_vmspace->vm_map, &addr, size, 417 (i == 0 ? uoff : UVM_UNKNOWN_OFFSET), 0) != 0) { 418 if (loop == 0) { 419 loop = 1; 420 i = 0; 421 pos = 0; 422 continue; 423 } 424 error = ENOMEM; 425 goto bad1; 426 } 427 if (addr != pos + loadmap[i].vaddr) { 428 /* base changed. */ 429 pos = addr - trunc_page(loadmap[i].vaddr); 430 pos = ELF_ROUND(pos,file_align); 431 i = 0; 432 continue; 433 } 434 435 i++; 436 } 437 438 /* 439 * Load all the necessary sections 440 */ 441 for (i = 0; i < eh.e_phnum; i++) { 442 Elf_Addr size = 0; 443 int prot = 0; 444 int flags; 445 446 switch (ph[i].p_type) { 447 case PT_LOAD: 448 if (base_ph == NULL) { 449 flags = VMCMD_BASE; 450 addr = pos; 451 base_ph = &ph[i]; 452 } else { 453 flags = VMCMD_RELATIVE; 454 addr = ph[i].p_vaddr - base_ph->p_vaddr; 455 } 456 elf_load_psection(&epp->ep_vmcmds, nd.ni_vp, 457 &ph[i], &addr, &size, &prot, flags); 458 /* If entry is within this section it must be text */ 459 if (eh.e_entry >= ph[i].p_vaddr && 460 eh.e_entry < (ph[i].p_vaddr + size)) { 461 epp->ep_entry = addr + eh.e_entry - 462 ELF_TRUNC(ph[i].p_vaddr,ph[i].p_align); 463 ap->arg_interp = addr; 464 } 465 addr += size; 466 break; 467 468 case PT_DYNAMIC: 469 case PT_PHDR: 470 case PT_NOTE: 471 break; 472 473 case PT_OPENBSD_RANDOMIZE: 474 if (ph[i].p_memsz > randomizequota) { 475 error = ENOMEM; 476 goto bad1; 477 } 478 randomizequota -= ph[i].p_memsz; 479 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_randomize, 480 ph[i].p_memsz, ph[i].p_vaddr + pos, NULLVP, 0, 0); 481 break; 482 483 default: 484 break; 485 } 486 } 487 488 vn_marktext(nd.ni_vp); 489 490 bad1: 491 VOP_CLOSE(nd.ni_vp, FREAD, p->p_ucred, p); 492 bad: 493 free(ph, M_TEMP, phsize); 494 495 vput(nd.ni_vp); 496 return (error); 497 } 498 499 /* 500 * Prepare an Elf binary's exec package 501 * 502 * First, set of the various offsets/lengths in the exec package. 503 * 504 * Then, mark the text image busy (so it can be demand paged) or error out if 505 * this is not possible. Finally, set up vmcmds for the text, data, bss, and 506 * stack segments. 507 */ 508 int 509 exec_elf_makecmds(struct proc *p, struct exec_package *epp) 510 { 511 Elf_Ehdr *eh = epp->ep_hdr; 512 Elf_Phdr *ph, *pp, *base_ph = NULL; 513 Elf_Addr phdr = 0, exe_base = 0; 514 int error, i, has_phdr = 0; 515 char *interp = NULL; 516 u_long phsize; 517 size_t randomizequota = ELF_RANDOMIZE_LIMIT; 518 519 if (epp->ep_hdrvalid < sizeof(Elf_Ehdr)) 520 return (ENOEXEC); 521 522 if (elf_check_header(eh) || 523 (eh->e_type != ET_EXEC && eh->e_type != ET_DYN)) 524 return (ENOEXEC); 525 526 /* 527 * check if vnode is in open for writing, because we want to demand- 528 * page out of it. if it is, don't do it, for various reasons. 529 */ 530 if (epp->ep_vp->v_writecount != 0) { 531 #ifdef DIAGNOSTIC 532 if (epp->ep_vp->v_flag & VTEXT) 533 panic("exec: a VTEXT vnode has writecount != 0"); 534 #endif 535 return (ETXTBSY); 536 } 537 /* 538 * Allocate space to hold all the program headers, and read them 539 * from the file 540 */ 541 ph = mallocarray(eh->e_phnum, sizeof(Elf_Phdr), M_TEMP, M_WAITOK); 542 phsize = eh->e_phnum * sizeof(Elf_Phdr); 543 544 if ((error = elf_read_from(p, epp->ep_vp, eh->e_phoff, ph, 545 phsize)) != 0) 546 goto bad; 547 548 epp->ep_tsize = ELF_NO_ADDR; 549 epp->ep_dsize = ELF_NO_ADDR; 550 551 for (i = 0, pp = ph; i < eh->e_phnum; i++, pp++) { 552 if (pp->p_type == PT_INTERP && !interp) { 553 if (pp->p_filesz < 2 || pp->p_filesz > MAXPATHLEN) 554 goto bad; 555 interp = pool_get(&namei_pool, PR_WAITOK); 556 if ((error = elf_read_from(p, epp->ep_vp, 557 pp->p_offset, interp, pp->p_filesz)) != 0) { 558 goto bad; 559 } 560 if (interp[pp->p_filesz - 1] != '\0') 561 goto bad; 562 } else if (pp->p_type == PT_LOAD) { 563 if (pp->p_filesz > pp->p_memsz) { 564 error = EINVAL; 565 goto bad; 566 } 567 if (base_ph == NULL) 568 base_ph = pp; 569 } else if (pp->p_type == PT_PHDR) { 570 has_phdr = 1; 571 } 572 } 573 574 if (eh->e_type == ET_DYN) { 575 /* need phdr and load sections for PIE */ 576 if (!has_phdr || base_ph == NULL) { 577 error = EINVAL; 578 goto bad; 579 } 580 /* randomize exe_base for PIE */ 581 exe_base = uvm_map_pie(base_ph->p_align); 582 } 583 584 /* 585 * OK, we want a slightly different twist of the 586 * standard emulation package for "real" elf. 587 */ 588 epp->ep_emul = &emul_elf; 589 590 /* 591 * Verify this is an OpenBSD executable. If it's marked that way 592 * via a PT_NOTE then also check for a PT_OPENBSD_WXNEEDED segment. 593 */ 594 if (eh->e_ident[EI_OSABI] != ELFOSABI_OPENBSD && (error = 595 elf_os_pt_note(p, epp, epp->ep_hdr, "OpenBSD", 8, 4)) != 0) { 596 goto bad; 597 } 598 599 /* 600 * Load all the necessary sections 601 */ 602 for (i = 0, pp = ph; i < eh->e_phnum; i++, pp++) { 603 Elf_Addr addr, size = 0; 604 int prot = 0; 605 int flags = 0; 606 607 switch (pp->p_type) { 608 case PT_LOAD: 609 if (exe_base != 0) { 610 if (pp == base_ph) { 611 flags = VMCMD_BASE; 612 addr = exe_base; 613 } else { 614 flags = VMCMD_RELATIVE; 615 addr = pp->p_vaddr - base_ph->p_vaddr; 616 } 617 } else 618 addr = ELF_NO_ADDR; 619 620 /* 621 * Calculates size of text and data segments 622 * by starting at first and going to end of last. 623 * 'rwx' sections are treated as data. 624 * this is correct for BSS_PLT, but may not be 625 * for DATA_PLT, is fine for TEXT_PLT. 626 */ 627 elf_load_psection(&epp->ep_vmcmds, epp->ep_vp, 628 pp, &addr, &size, &prot, flags); 629 630 /* 631 * Update exe_base in case alignment was off. 632 * For PIE, addr is relative to exe_base so 633 * adjust it (non PIE exe_base is 0 so no change). 634 */ 635 if (flags == VMCMD_BASE) 636 exe_base = addr; 637 else 638 addr += exe_base; 639 640 /* 641 * Decide whether it's text or data by looking 642 * at the protection of the section 643 */ 644 if (prot & PROT_WRITE) { 645 /* data section */ 646 if (epp->ep_dsize == ELF_NO_ADDR) { 647 epp->ep_daddr = addr; 648 epp->ep_dsize = size; 649 } else { 650 if (addr < epp->ep_daddr) { 651 epp->ep_dsize = 652 epp->ep_dsize + 653 epp->ep_daddr - 654 addr; 655 epp->ep_daddr = addr; 656 } else 657 epp->ep_dsize = addr+size - 658 epp->ep_daddr; 659 } 660 } else if (prot & PROT_EXEC) { 661 /* text section */ 662 if (epp->ep_tsize == ELF_NO_ADDR) { 663 epp->ep_taddr = addr; 664 epp->ep_tsize = size; 665 } else { 666 if (addr < epp->ep_taddr) { 667 epp->ep_tsize = 668 epp->ep_tsize + 669 epp->ep_taddr - 670 addr; 671 epp->ep_taddr = addr; 672 } else 673 epp->ep_tsize = addr+size - 674 epp->ep_taddr; 675 } 676 } 677 break; 678 679 case PT_SHLIB: 680 error = ENOEXEC; 681 goto bad; 682 683 case PT_INTERP: 684 /* Already did this one */ 685 case PT_DYNAMIC: 686 case PT_NOTE: 687 break; 688 689 case PT_PHDR: 690 /* Note address of program headers (in text segment) */ 691 phdr = pp->p_vaddr; 692 break; 693 694 case PT_OPENBSD_RANDOMIZE: 695 if (ph[i].p_memsz > randomizequota) { 696 error = ENOMEM; 697 goto bad; 698 } 699 randomizequota -= ph[i].p_memsz; 700 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_randomize, 701 ph[i].p_memsz, ph[i].p_vaddr + exe_base, NULLVP, 0, 0); 702 break; 703 704 default: 705 /* 706 * Not fatal, we don't need to understand everything 707 * :-) 708 */ 709 break; 710 } 711 } 712 713 phdr += exe_base; 714 715 /* 716 * Strangely some linux programs may have all load sections marked 717 * writeable, in this case, textsize is not -1, but rather 0; 718 */ 719 if (epp->ep_tsize == ELF_NO_ADDR) 720 epp->ep_tsize = 0; 721 /* 722 * Another possibility is that it has all load sections marked 723 * read-only. Fake a zero-sized data segment right after the 724 * text segment. 725 */ 726 if (epp->ep_dsize == ELF_NO_ADDR) { 727 epp->ep_daddr = round_page(epp->ep_taddr + epp->ep_tsize); 728 epp->ep_dsize = 0; 729 } 730 731 epp->ep_interp = interp; 732 epp->ep_entry = eh->e_entry + exe_base; 733 734 /* 735 * Check if we found a dynamically linked binary and arrange to load 736 * its interpreter when the exec file is released. 737 */ 738 if (interp || eh->e_type == ET_DYN) { 739 struct elf_args *ap; 740 741 ap = malloc(sizeof(*ap), M_TEMP, M_WAITOK); 742 743 ap->arg_phaddr = phdr; 744 ap->arg_phentsize = eh->e_phentsize; 745 ap->arg_phnum = eh->e_phnum; 746 ap->arg_entry = eh->e_entry + exe_base; 747 ap->arg_interp = exe_base; 748 749 epp->ep_emul_arg = ap; 750 epp->ep_emul_argsize = sizeof *ap; 751 } 752 753 free(ph, M_TEMP, phsize); 754 vn_marktext(epp->ep_vp); 755 return (exec_setup_stack(p, epp)); 756 757 bad: 758 if (interp) 759 pool_put(&namei_pool, interp); 760 free(ph, M_TEMP, phsize); 761 kill_vmcmds(&epp->ep_vmcmds); 762 if (error == 0) 763 return (ENOEXEC); 764 return (error); 765 } 766 767 /* 768 * Phase II of load. It is now safe to load the interpreter. Info collected 769 * when loading the program is available for setup of the interpreter. 770 */ 771 int 772 exec_elf_fixup(struct proc *p, struct exec_package *epp) 773 { 774 char *interp; 775 int error = 0; 776 struct elf_args *ap; 777 AuxInfo ai[ELF_AUX_ENTRIES], *a; 778 779 if (epp->ep_emul_arg == NULL) { 780 return (0); 781 } 782 783 interp = epp->ep_interp; 784 ap = epp->ep_emul_arg; 785 786 if (interp && 787 (error = elf_load_file(p, interp, epp, ap)) != 0) { 788 free(ap, M_TEMP, epp->ep_emul_argsize); 789 pool_put(&namei_pool, interp); 790 kill_vmcmds(&epp->ep_vmcmds); 791 return (error); 792 } 793 /* 794 * We have to do this ourselves... 795 */ 796 error = exec_process_vmcmds(p, epp); 797 798 /* 799 * Push extra arguments on the stack needed by dynamically 800 * linked binaries 801 */ 802 if (error == 0) { 803 a = ai; 804 805 a->au_id = AUX_phdr; 806 a->au_v = ap->arg_phaddr; 807 a++; 808 809 a->au_id = AUX_phent; 810 a->au_v = ap->arg_phentsize; 811 a++; 812 813 a->au_id = AUX_phnum; 814 a->au_v = ap->arg_phnum; 815 a++; 816 817 a->au_id = AUX_pagesz; 818 a->au_v = PAGE_SIZE; 819 a++; 820 821 a->au_id = AUX_base; 822 a->au_v = ap->arg_interp; 823 a++; 824 825 a->au_id = AUX_flags; 826 a->au_v = 0; 827 a++; 828 829 a->au_id = AUX_entry; 830 a->au_v = ap->arg_entry; 831 a++; 832 833 a->au_id = AUX_null; 834 a->au_v = 0; 835 a++; 836 837 error = copyout(ai, epp->ep_emul_argp, sizeof ai); 838 } 839 free(ap, M_TEMP, epp->ep_emul_argsize); 840 if (interp) 841 pool_put(&namei_pool, interp); 842 return (error); 843 } 844 845 int 846 elf_os_pt_note(struct proc *p, struct exec_package *epp, Elf_Ehdr *eh, 847 char *os_name, size_t name_size, size_t desc_size) 848 { 849 char pathbuf[MAXPATHLEN]; 850 Elf_Phdr *hph, *ph; 851 Elf_Note *np = NULL; 852 size_t phsize; 853 int error; 854 855 hph = mallocarray(eh->e_phnum, sizeof(Elf_Phdr), M_TEMP, M_WAITOK); 856 phsize = eh->e_phnum * sizeof(Elf_Phdr); 857 if ((error = elf_read_from(p, epp->ep_vp, eh->e_phoff, 858 hph, phsize)) != 0) 859 goto out1; 860 861 for (ph = hph; ph < &hph[eh->e_phnum]; ph++) { 862 if (ph->p_type == PT_OPENBSD_WXNEEDED) { 863 int wxallowed = (epp->ep_vp->v_mount && 864 (epp->ep_vp->v_mount->mnt_flag & MNT_WXALLOWED)); 865 866 if (!wxallowed) { 867 error = copyinstr(epp->ep_name, &pathbuf, 868 sizeof(pathbuf), NULL); 869 log(LOG_NOTICE, 870 "%s(%d): W^X binary outside wxallowed mountpoint\n", 871 error ? "" : pathbuf, p->p_p->ps_pid); 872 error = EACCES; 873 goto out1; 874 } 875 epp->ep_flags |= EXEC_WXNEEDED; 876 break; 877 } 878 } 879 880 for (ph = hph; ph < &hph[eh->e_phnum]; ph++) { 881 if (ph->p_type != PT_NOTE || 882 ph->p_filesz > 1024 || 883 ph->p_filesz < sizeof(Elf_Note) + name_size) 884 continue; 885 886 np = malloc(ph->p_filesz, M_TEMP, M_WAITOK); 887 if ((error = elf_read_from(p, epp->ep_vp, ph->p_offset, 888 np, ph->p_filesz)) != 0) 889 goto out2; 890 891 #if 0 892 if (np->type != ELF_NOTE_TYPE_OSVERSION) { 893 free(np, M_TEMP, ph->p_filesz); 894 np = NULL; 895 continue; 896 } 897 #endif 898 899 /* Check the name and description sizes. */ 900 if (np->namesz != name_size || 901 np->descsz != desc_size) 902 goto out3; 903 904 if (memcmp((np + 1), os_name, name_size)) 905 goto out3; 906 907 /* XXX: We could check for the specific emulation here */ 908 /* All checks succeeded. */ 909 error = 0; 910 goto out2; 911 } 912 913 out3: 914 error = ENOEXEC; 915 out2: 916 free(np, M_TEMP, ph->p_filesz); 917 out1: 918 free(hph, M_TEMP, phsize); 919 return error; 920 } 921 922 /* 923 * Start of routines related to dumping core 924 */ 925 926 #ifdef SMALL_KERNEL 927 int 928 coredump_elf(struct proc *p, void *cookie) 929 { 930 return EPERM; 931 } 932 #else /* !SMALL_KERNEL */ 933 934 935 struct countsegs_state { 936 int npsections; 937 }; 938 939 int coredump_countsegs_elf(struct proc *, void *, 940 struct uvm_coredump_state *); 941 942 struct writesegs_state { 943 Elf_Phdr *psections; 944 off_t secoff; 945 }; 946 947 int coredump_writeseghdrs_elf(struct proc *, void *, 948 struct uvm_coredump_state *); 949 950 int coredump_notes_elf(struct proc *, void *, size_t *); 951 int coredump_note_elf(struct proc *, void *, size_t *); 952 int coredump_writenote_elf(struct proc *, void *, Elf_Note *, 953 const char *, void *); 954 955 #define ELFROUNDSIZE 4 /* XXX Should it be sizeof(Elf_Word)? */ 956 #define elfround(x) roundup((x), ELFROUNDSIZE) 957 958 int 959 coredump_elf(struct proc *p, void *cookie) 960 { 961 Elf_Ehdr ehdr; 962 Elf_Phdr *psections = NULL; 963 struct countsegs_state cs; 964 struct writesegs_state ws; 965 off_t notestart, secstart, offset; 966 size_t notesize, psectionslen; 967 int error, i; 968 969 /* 970 * We have to make a total of 3 passes across the map: 971 * 972 * 1. Count the number of map entries (the number of 973 * PT_LOAD sections). 974 * 975 * 2. Write the P-section headers. 976 * 977 * 3. Write the P-sections. 978 */ 979 980 /* Pass 1: count the entries. */ 981 cs.npsections = 0; 982 error = uvm_coredump_walkmap(p, NULL, coredump_countsegs_elf, &cs); 983 if (error) 984 goto out; 985 986 /* Count the PT_NOTE section. */ 987 cs.npsections++; 988 989 /* Get the size of the notes. */ 990 error = coredump_notes_elf(p, NULL, ¬esize); 991 if (error) 992 goto out; 993 994 memset(&ehdr, 0, sizeof(ehdr)); 995 memcpy(ehdr.e_ident, ELFMAG, SELFMAG); 996 ehdr.e_ident[EI_CLASS] = ELF_TARG_CLASS; 997 ehdr.e_ident[EI_DATA] = ELF_TARG_DATA; 998 ehdr.e_ident[EI_VERSION] = EV_CURRENT; 999 /* XXX Should be the OSABI/ABI version of the executable. */ 1000 ehdr.e_ident[EI_OSABI] = ELFOSABI_SYSV; 1001 ehdr.e_ident[EI_ABIVERSION] = 0; 1002 ehdr.e_type = ET_CORE; 1003 /* XXX This should be the e_machine of the executable. */ 1004 ehdr.e_machine = ELF_TARG_MACH; 1005 ehdr.e_version = EV_CURRENT; 1006 ehdr.e_entry = 0; 1007 ehdr.e_phoff = sizeof(ehdr); 1008 ehdr.e_shoff = 0; 1009 ehdr.e_flags = 0; 1010 ehdr.e_ehsize = sizeof(ehdr); 1011 ehdr.e_phentsize = sizeof(Elf_Phdr); 1012 ehdr.e_phnum = cs.npsections; 1013 ehdr.e_shentsize = 0; 1014 ehdr.e_shnum = 0; 1015 ehdr.e_shstrndx = 0; 1016 1017 /* Write out the ELF header. */ 1018 error = coredump_write(cookie, UIO_SYSSPACE, &ehdr, sizeof(ehdr)); 1019 if (error) 1020 goto out; 1021 1022 psections = mallocarray(cs.npsections, sizeof(Elf_Phdr), 1023 M_TEMP, M_WAITOK|M_ZERO); 1024 psectionslen = cs.npsections * sizeof(Elf_Phdr); 1025 1026 offset = sizeof(ehdr); 1027 notestart = offset + psectionslen; 1028 secstart = notestart + notesize; 1029 1030 /* Pass 2: now write the P-section headers. */ 1031 ws.secoff = secstart; 1032 ws.psections = psections; 1033 error = uvm_coredump_walkmap(p, cookie, coredump_writeseghdrs_elf, &ws); 1034 if (error) 1035 goto out; 1036 1037 /* Write out the PT_NOTE header. */ 1038 ws.psections->p_type = PT_NOTE; 1039 ws.psections->p_offset = notestart; 1040 ws.psections->p_vaddr = 0; 1041 ws.psections->p_paddr = 0; 1042 ws.psections->p_filesz = notesize; 1043 ws.psections->p_memsz = 0; 1044 ws.psections->p_flags = PF_R; 1045 ws.psections->p_align = ELFROUNDSIZE; 1046 1047 error = coredump_write(cookie, UIO_SYSSPACE, psections, psectionslen); 1048 if (error) 1049 goto out; 1050 1051 #ifdef DIAGNOSTIC 1052 offset += psectionslen; 1053 if (offset != notestart) 1054 panic("coredump: offset %lld != notestart %lld", 1055 (long long) offset, (long long) notestart); 1056 #endif 1057 1058 /* Write out the notes. */ 1059 error = coredump_notes_elf(p, cookie, ¬esize); 1060 if (error) 1061 goto out; 1062 1063 #ifdef DIAGNOSTIC 1064 offset += notesize; 1065 if (offset != secstart) 1066 panic("coredump: offset %lld != secstart %lld", 1067 (long long) offset, (long long) secstart); 1068 #endif 1069 1070 /* Pass 3: finally, write the sections themselves. */ 1071 for (i = 0; i < cs.npsections - 1; i++) { 1072 if (psections[i].p_filesz == 0) 1073 continue; 1074 1075 #ifdef DIAGNOSTIC 1076 if (offset != psections[i].p_offset) 1077 panic("coredump: offset %lld != p_offset[%d] %lld", 1078 (long long) offset, i, 1079 (long long) psections[i].p_filesz); 1080 #endif 1081 1082 error = coredump_write(cookie, UIO_USERSPACE, 1083 (void *)(vaddr_t)psections[i].p_vaddr, 1084 psections[i].p_filesz); 1085 if (error) 1086 goto out; 1087 1088 coredump_unmap(cookie, (vaddr_t)psections[i].p_vaddr, 1089 (vaddr_t)psections[i].p_vaddr + psections[i].p_filesz); 1090 1091 #ifdef DIAGNOSTIC 1092 offset += psections[i].p_filesz; 1093 #endif 1094 } 1095 1096 out: 1097 free(psections, M_TEMP, psectionslen); 1098 return (error); 1099 } 1100 1101 int 1102 coredump_countsegs_elf(struct proc *p, void *iocookie, 1103 struct uvm_coredump_state *us) 1104 { 1105 struct countsegs_state *cs = us->cookie; 1106 1107 cs->npsections++; 1108 return (0); 1109 } 1110 1111 int 1112 coredump_writeseghdrs_elf(struct proc *p, void *iocookie, 1113 struct uvm_coredump_state *us) 1114 { 1115 struct writesegs_state *ws = us->cookie; 1116 Elf_Phdr phdr; 1117 vsize_t size, realsize; 1118 1119 size = us->end - us->start; 1120 realsize = us->realend - us->start; 1121 1122 phdr.p_type = PT_LOAD; 1123 phdr.p_offset = ws->secoff; 1124 phdr.p_vaddr = us->start; 1125 phdr.p_paddr = 0; 1126 phdr.p_filesz = realsize; 1127 phdr.p_memsz = size; 1128 phdr.p_flags = 0; 1129 if (us->prot & PROT_READ) 1130 phdr.p_flags |= PF_R; 1131 if (us->prot & PROT_WRITE) 1132 phdr.p_flags |= PF_W; 1133 if (us->prot & PROT_EXEC) 1134 phdr.p_flags |= PF_X; 1135 phdr.p_align = PAGE_SIZE; 1136 1137 ws->secoff += phdr.p_filesz; 1138 *ws->psections++ = phdr; 1139 1140 return (0); 1141 } 1142 1143 int 1144 coredump_notes_elf(struct proc *p, void *iocookie, size_t *sizep) 1145 { 1146 struct ps_strings pss; 1147 struct iovec iov; 1148 struct uio uio; 1149 struct elfcore_procinfo cpi; 1150 Elf_Note nhdr; 1151 struct process *pr = p->p_p; 1152 struct proc *q; 1153 size_t size, notesize; 1154 int error; 1155 1156 size = 0; 1157 1158 /* First, write an elfcore_procinfo. */ 1159 notesize = sizeof(nhdr) + elfround(sizeof("OpenBSD")) + 1160 elfround(sizeof(cpi)); 1161 if (iocookie) { 1162 memset(&cpi, 0, sizeof(cpi)); 1163 1164 cpi.cpi_version = ELFCORE_PROCINFO_VERSION; 1165 cpi.cpi_cpisize = sizeof(cpi); 1166 cpi.cpi_signo = p->p_sisig; 1167 cpi.cpi_sigcode = p->p_sicode; 1168 1169 cpi.cpi_sigpend = p->p_siglist; 1170 cpi.cpi_sigmask = p->p_sigmask; 1171 cpi.cpi_sigignore = pr->ps_sigacts->ps_sigignore; 1172 cpi.cpi_sigcatch = pr->ps_sigacts->ps_sigcatch; 1173 1174 cpi.cpi_pid = pr->ps_pid; 1175 cpi.cpi_ppid = pr->ps_pptr->ps_pid; 1176 cpi.cpi_pgrp = pr->ps_pgid; 1177 if (pr->ps_session->s_leader) 1178 cpi.cpi_sid = pr->ps_session->s_leader->ps_pid; 1179 else 1180 cpi.cpi_sid = 0; 1181 1182 cpi.cpi_ruid = p->p_ucred->cr_ruid; 1183 cpi.cpi_euid = p->p_ucred->cr_uid; 1184 cpi.cpi_svuid = p->p_ucred->cr_svuid; 1185 1186 cpi.cpi_rgid = p->p_ucred->cr_rgid; 1187 cpi.cpi_egid = p->p_ucred->cr_gid; 1188 cpi.cpi_svgid = p->p_ucred->cr_svgid; 1189 1190 (void)strlcpy(cpi.cpi_name, pr->ps_comm, sizeof(cpi.cpi_name)); 1191 1192 nhdr.namesz = sizeof("OpenBSD"); 1193 nhdr.descsz = sizeof(cpi); 1194 nhdr.type = NT_OPENBSD_PROCINFO; 1195 1196 error = coredump_writenote_elf(p, iocookie, &nhdr, 1197 "OpenBSD", &cpi); 1198 if (error) 1199 return (error); 1200 } 1201 size += notesize; 1202 1203 /* Second, write an NT_OPENBSD_AUXV note. */ 1204 notesize = sizeof(nhdr) + elfround(sizeof("OpenBSD")) + 1205 elfround(pr->ps_emul->e_arglen * sizeof(char *)); 1206 if (iocookie) { 1207 iov.iov_base = &pss; 1208 iov.iov_len = sizeof(pss); 1209 uio.uio_iov = &iov; 1210 uio.uio_iovcnt = 1; 1211 uio.uio_offset = (off_t)pr->ps_strings; 1212 uio.uio_resid = sizeof(pss); 1213 uio.uio_segflg = UIO_SYSSPACE; 1214 uio.uio_rw = UIO_READ; 1215 uio.uio_procp = NULL; 1216 1217 error = uvm_io(&p->p_vmspace->vm_map, &uio, 0); 1218 if (error) 1219 return (error); 1220 1221 if (pss.ps_envstr == NULL) 1222 return (EIO); 1223 1224 nhdr.namesz = sizeof("OpenBSD"); 1225 nhdr.descsz = pr->ps_emul->e_arglen * sizeof(char *); 1226 nhdr.type = NT_OPENBSD_AUXV; 1227 1228 error = coredump_write(iocookie, UIO_SYSSPACE, 1229 &nhdr, sizeof(nhdr)); 1230 if (error) 1231 return (error); 1232 1233 error = coredump_write(iocookie, UIO_SYSSPACE, 1234 "OpenBSD", elfround(nhdr.namesz)); 1235 if (error) 1236 return (error); 1237 1238 error = coredump_write(iocookie, UIO_USERSPACE, 1239 pss.ps_envstr + pss.ps_nenvstr + 1, nhdr.descsz); 1240 if (error) 1241 return (error); 1242 } 1243 size += notesize; 1244 1245 #ifdef PT_WCOOKIE 1246 notesize = sizeof(nhdr) + elfround(sizeof("OpenBSD")) + 1247 elfround(sizeof(register_t)); 1248 if (iocookie) { 1249 register_t wcookie; 1250 1251 nhdr.namesz = sizeof("OpenBSD"); 1252 nhdr.descsz = sizeof(register_t); 1253 nhdr.type = NT_OPENBSD_WCOOKIE; 1254 1255 wcookie = process_get_wcookie(p); 1256 error = coredump_writenote_elf(p, iocookie, &nhdr, 1257 "OpenBSD", &wcookie); 1258 if (error) 1259 return (error); 1260 } 1261 size += notesize; 1262 #endif 1263 1264 /* 1265 * Now write the register info for the thread that caused the 1266 * coredump. 1267 */ 1268 error = coredump_note_elf(p, iocookie, ¬esize); 1269 if (error) 1270 return (error); 1271 size += notesize; 1272 1273 /* 1274 * Now, for each thread, write the register info and any other 1275 * per-thread notes. Since we're dumping core, all the other 1276 * threads in the process have been stopped and the list can't 1277 * change. 1278 */ 1279 TAILQ_FOREACH(q, &pr->ps_threads, p_thr_link) { 1280 if (q == p) /* we've taken care of this thread */ 1281 continue; 1282 error = coredump_note_elf(q, iocookie, ¬esize); 1283 if (error) 1284 return (error); 1285 size += notesize; 1286 } 1287 1288 *sizep = size; 1289 return (0); 1290 } 1291 1292 int 1293 coredump_note_elf(struct proc *p, void *iocookie, size_t *sizep) 1294 { 1295 Elf_Note nhdr; 1296 int size, notesize, error; 1297 int namesize; 1298 char name[64+ELFROUNDSIZE]; 1299 struct reg intreg; 1300 #ifdef PT_GETFPREGS 1301 struct fpreg freg; 1302 #endif 1303 1304 size = 0; 1305 1306 snprintf(name, sizeof(name)-ELFROUNDSIZE, "%s@%d", 1307 "OpenBSD", p->p_tid + THREAD_PID_OFFSET); 1308 namesize = strlen(name) + 1; 1309 memset(name + namesize, 0, elfround(namesize) - namesize); 1310 1311 notesize = sizeof(nhdr) + elfround(namesize) + elfround(sizeof(intreg)); 1312 if (iocookie) { 1313 error = process_read_regs(p, &intreg); 1314 if (error) 1315 return (error); 1316 1317 nhdr.namesz = namesize; 1318 nhdr.descsz = sizeof(intreg); 1319 nhdr.type = NT_OPENBSD_REGS; 1320 1321 error = coredump_writenote_elf(p, iocookie, &nhdr, 1322 name, &intreg); 1323 if (error) 1324 return (error); 1325 1326 } 1327 size += notesize; 1328 1329 #ifdef PT_GETFPREGS 1330 notesize = sizeof(nhdr) + elfround(namesize) + elfround(sizeof(freg)); 1331 if (iocookie) { 1332 error = process_read_fpregs(p, &freg); 1333 if (error) 1334 return (error); 1335 1336 nhdr.namesz = namesize; 1337 nhdr.descsz = sizeof(freg); 1338 nhdr.type = NT_OPENBSD_FPREGS; 1339 1340 error = coredump_writenote_elf(p, iocookie, &nhdr, name, &freg); 1341 if (error) 1342 return (error); 1343 } 1344 size += notesize; 1345 #endif 1346 1347 *sizep = size; 1348 /* XXX Add hook for machdep per-LWP notes. */ 1349 return (0); 1350 } 1351 1352 int 1353 coredump_writenote_elf(struct proc *p, void *cookie, Elf_Note *nhdr, 1354 const char *name, void *data) 1355 { 1356 int error; 1357 1358 error = coredump_write(cookie, UIO_SYSSPACE, nhdr, sizeof(*nhdr)); 1359 if (error) 1360 return error; 1361 1362 error = coredump_write(cookie, UIO_SYSSPACE, name, 1363 elfround(nhdr->namesz)); 1364 if (error) 1365 return error; 1366 1367 return coredump_write(cookie, UIO_SYSSPACE, data, nhdr->descsz); 1368 } 1369 #endif /* !SMALL_KERNEL */ 1370