1 /* $OpenBSD: exec_elf.c,v 1.124 2016/05/30 21:31:29 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/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 struct ELFNAME(probe_entry) { 97 int (*func)(struct proc *, struct exec_package *, char *, 98 u_long *); 99 } ELFNAME(probes)[] = { 100 /* XXX - bogus, shouldn't be size independent.. */ 101 { NULL } 102 }; 103 104 int ELFNAME(load_file)(struct proc *, char *, struct exec_package *, 105 struct elf_args *, Elf_Addr *); 106 int ELFNAME(check_header)(Elf_Ehdr *); 107 int ELFNAME(read_from)(struct proc *, struct vnode *, u_long, caddr_t, int); 108 void ELFNAME(load_psection)(struct exec_vmcmd_set *, struct vnode *, 109 Elf_Phdr *, Elf_Addr *, Elf_Addr *, int *, int); 110 int ELFNAMEEND(coredump)(struct proc *, void *); 111 112 extern char sigcode[], esigcode[], sigcoderet[]; 113 #ifdef SYSCALL_DEBUG 114 extern char *syscallnames[]; 115 #endif 116 117 /* round up and down to page boundaries. */ 118 #define ELF_ROUND(a, b) (((a) + (b) - 1) & ~((b) - 1)) 119 #define ELF_TRUNC(a, b) ((a) & ~((b) - 1)) 120 121 /* 122 * We limit the number of program headers to 32, this should 123 * be a reasonable limit for ELF, the most we have seen so far is 12 124 */ 125 #define ELF_MAX_VALID_PHDR 32 126 127 /* 128 * This is the basic elf emul. elf_probe_funcs may change to other emuls. 129 */ 130 struct emul ELFNAMEEND(emul) = { 131 "native", 132 NULL, 133 sendsig, 134 SYS_syscall, 135 SYS_MAXSYSCALL, 136 sysent, 137 #ifdef SYSCALL_DEBUG 138 syscallnames, 139 #else 140 NULL, 141 #endif 142 (sizeof(AuxInfo) * ELF_AUX_ENTRIES / sizeof(char *)), 143 ELFNAME(copyargs), 144 setregs, 145 ELFNAME2(exec,fixup), 146 ELFNAMEEND(coredump), 147 sigcode, 148 esigcode, 149 sigcoderet, 150 EMUL_ENABLED | EMUL_NATIVE, 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 ELFNAME(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 ELFNAME(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 ELFNAME(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 != ELFDEFNNAME(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 *prot |= (ph->p_flags & PF_R) ? PROT_READ : 0; 240 *prot |= (ph->p_flags & PF_W) ? PROT_WRITE : 0; 241 *prot |= (ph->p_flags & PF_X) ? PROT_EXEC : 0; 242 243 msize = ph->p_memsz + diff; 244 offset = ph->p_offset - bdiff; 245 lsize = ph->p_filesz + bdiff; 246 psize = round_page(lsize); 247 248 /* 249 * Because the pagedvn pager can't handle zero fill of the last 250 * data page if it's not page aligned we map the last page readvn. 251 */ 252 if (ph->p_flags & PF_W) { 253 psize = trunc_page(lsize); 254 if (psize > 0) 255 NEW_VMCMD2(vcset, vmcmd_map_pagedvn, psize, base, vp, 256 offset, *prot, flags); 257 if (psize != lsize) { 258 NEW_VMCMD2(vcset, vmcmd_map_readvn, lsize - psize, 259 base + psize, vp, offset + psize, *prot, flags); 260 } 261 } else { 262 NEW_VMCMD2(vcset, vmcmd_map_pagedvn, psize, base, vp, offset, 263 *prot, flags); 264 } 265 266 /* 267 * Check if we need to extend the size of the segment 268 */ 269 rm = round_page(*addr + ph->p_memsz + diff); 270 rf = round_page(*addr + ph->p_filesz + diff); 271 272 if (rm != rf) { 273 NEW_VMCMD2(vcset, vmcmd_map_zero, rm - rf, rf, NULLVP, 0, 274 *prot, flags); 275 } 276 *size = msize; 277 } 278 279 /* 280 * Read from vnode into buffer at offset. 281 */ 282 int 283 ELFNAME(read_from)(struct proc *p, struct vnode *vp, u_long off, caddr_t buf, 284 int size) 285 { 286 int error; 287 size_t resid; 288 289 if ((error = vn_rdwr(UIO_READ, vp, buf, size, off, UIO_SYSSPACE, 290 0, p->p_ucred, &resid, p)) != 0) 291 return error; 292 /* 293 * See if we got all of it 294 */ 295 if (resid != 0) 296 return (ENOEXEC); 297 return (0); 298 } 299 300 /* 301 * Load a file (interpreter/library) pointed to by path [stolen from 302 * coff_load_shlib()]. Made slightly generic so it might be used externally. 303 */ 304 int 305 ELFNAME(load_file)(struct proc *p, char *path, struct exec_package *epp, 306 struct elf_args *ap, Elf_Addr *last) 307 { 308 int error, i; 309 struct nameidata nd; 310 Elf_Ehdr eh; 311 Elf_Phdr *ph = NULL; 312 u_long phsize; 313 Elf_Addr addr; 314 struct vnode *vp; 315 Elf_Phdr *base_ph = NULL; 316 struct interp_ld_sec { 317 Elf_Addr vaddr; 318 u_long memsz; 319 } loadmap[ELF_MAX_VALID_PHDR]; 320 int nload, idx = 0; 321 Elf_Addr pos = *last; 322 int file_align; 323 int loop; 324 size_t randomizequota = ELF_RANDOMIZE_LIMIT; 325 326 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, path, p); 327 nd.ni_pledge = PLEDGE_RPATH; 328 if ((error = namei(&nd)) != 0) { 329 return (error); 330 } 331 vp = nd.ni_vp; 332 if (vp->v_type != VREG) { 333 error = EACCES; 334 goto bad; 335 } 336 if ((error = VOP_GETATTR(vp, epp->ep_vap, p->p_ucred, p)) != 0) 337 goto bad; 338 if (vp->v_mount->mnt_flag & MNT_NOEXEC) { 339 error = EACCES; 340 goto bad; 341 } 342 if ((error = VOP_ACCESS(vp, VREAD, p->p_ucred, p)) != 0) 343 goto bad1; 344 if ((error = ELFNAME(read_from)(p, nd.ni_vp, 0, 345 (caddr_t)&eh, sizeof(eh))) != 0) 346 goto bad1; 347 348 if (ELFNAME(check_header)(&eh) || eh.e_type != ET_DYN) { 349 error = ENOEXEC; 350 goto bad1; 351 } 352 353 ph = mallocarray(eh.e_phnum, sizeof(Elf_Phdr), M_TEMP, M_WAITOK); 354 phsize = eh.e_phnum * sizeof(Elf_Phdr); 355 356 if ((error = ELFNAME(read_from)(p, nd.ni_vp, eh.e_phoff, (caddr_t)ph, 357 phsize)) != 0) 358 goto bad1; 359 360 for (i = 0; i < eh.e_phnum; i++) { 361 if (ph[i].p_type == PT_LOAD) { 362 if (ph[i].p_filesz > ph[i].p_memsz) 363 goto bad1; 364 loadmap[idx].vaddr = trunc_page(ph[i].p_vaddr); 365 loadmap[idx].memsz = round_page (ph[i].p_vaddr + 366 ph[i].p_memsz - loadmap[idx].vaddr); 367 file_align = ph[i].p_align; 368 idx++; 369 } 370 } 371 nload = idx; 372 373 /* 374 * If no position to load the interpreter was set by a probe 375 * function, pick the same address that a non-fixed mmap(0, ..) 376 * would (i.e. something safely out of the way). 377 */ 378 if (pos == ELFDEFNNAME(NO_ADDR)) { 379 pos = uvm_map_hint(p->p_vmspace, PROT_EXEC, 380 VM_MIN_ADDRESS, VM_MAXUSER_ADDRESS); 381 } 382 383 pos = ELF_ROUND(pos, file_align); 384 *last = epp->ep_interp_pos = pos; 385 loop = 0; 386 for (i = 0; i < nload;/**/) { 387 vaddr_t addr; 388 struct uvm_object *uobj; 389 off_t uoff; 390 size_t size; 391 392 #ifdef this_needs_fixing 393 if (i == 0) { 394 uobj = &vp->v_uvm.u_obj; 395 /* need to fix uoff */ 396 } else { 397 #endif 398 uobj = NULL; 399 uoff = 0; 400 #ifdef this_needs_fixing 401 } 402 #endif 403 404 addr = trunc_page(pos + loadmap[i].vaddr); 405 size = round_page(addr + loadmap[i].memsz) - addr; 406 407 /* CRAP - map_findspace does not avoid daddr+BRKSIZ */ 408 if ((addr + size > (vaddr_t)p->p_vmspace->vm_daddr) && 409 (addr < (vaddr_t)p->p_vmspace->vm_daddr + BRKSIZ)) 410 addr = round_page((vaddr_t)p->p_vmspace->vm_daddr + 411 BRKSIZ); 412 413 if (uvm_map_mquery(&p->p_vmspace->vm_map, &addr, size, 414 (i == 0 ? uoff : UVM_UNKNOWN_OFFSET), 0) != 0) { 415 if (loop == 0) { 416 loop = 1; 417 i = 0; 418 *last = epp->ep_interp_pos = pos = 0; 419 continue; 420 } 421 error = ENOMEM; 422 goto bad1; 423 } 424 if (addr != pos + loadmap[i].vaddr) { 425 /* base changed. */ 426 pos = addr - trunc_page(loadmap[i].vaddr); 427 pos = ELF_ROUND(pos,file_align); 428 epp->ep_interp_pos = *last = pos; 429 i = 0; 430 continue; 431 } 432 433 i++; 434 } 435 436 /* 437 * Load all the necessary sections 438 */ 439 for (i = 0; i < eh.e_phnum; i++) { 440 Elf_Addr size = 0; 441 int prot = 0; 442 int flags; 443 444 switch (ph[i].p_type) { 445 case PT_LOAD: 446 if (base_ph == NULL) { 447 flags = VMCMD_BASE; 448 addr = *last; 449 base_ph = &ph[i]; 450 } else { 451 flags = VMCMD_RELATIVE; 452 addr = ph[i].p_vaddr - base_ph->p_vaddr; 453 } 454 ELFNAME(load_psection)(&epp->ep_vmcmds, nd.ni_vp, 455 &ph[i], &addr, &size, &prot, flags); 456 /* If entry is within this section it must be text */ 457 if (eh.e_entry >= ph[i].p_vaddr && 458 eh.e_entry < (ph[i].p_vaddr + size)) { 459 epp->ep_entry = addr + eh.e_entry - 460 ELF_TRUNC(ph[i].p_vaddr,ph[i].p_align); 461 ap->arg_interp = addr; 462 } 463 addr += size; 464 break; 465 466 case PT_DYNAMIC: 467 case PT_PHDR: 468 case PT_NOTE: 469 break; 470 471 case PT_OPENBSD_RANDOMIZE: 472 if (ph[i].p_memsz > randomizequota) { 473 error = ENOMEM; 474 goto bad1; 475 } 476 randomizequota -= ph[i].p_memsz; 477 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_randomize, 478 ph[i].p_memsz, ph[i].p_vaddr + pos, NULLVP, 0, 0); 479 break; 480 481 default: 482 break; 483 } 484 } 485 486 vn_marktext(nd.ni_vp); 487 488 bad1: 489 VOP_CLOSE(nd.ni_vp, FREAD, p->p_ucred, p); 490 bad: 491 free(ph, M_TEMP, phsize); 492 493 *last = addr; 494 vput(nd.ni_vp); 495 return (error); 496 } 497 498 /* 499 * Prepare an Elf binary's exec package 500 * 501 * First, set of the various offsets/lengths in the exec package. 502 * 503 * Then, mark the text image busy (so it can be demand paged) or error out if 504 * this is not possible. Finally, set up vmcmds for the text, data, bss, and 505 * stack segments. 506 */ 507 int 508 ELFNAME2(exec,makecmds)(struct proc *p, struct exec_package *epp) 509 { 510 Elf_Ehdr *eh = epp->ep_hdr; 511 Elf_Phdr *ph, *pp, *base_ph = NULL; 512 Elf_Addr phdr = 0, exe_base = 0; 513 int error, i, has_phdr = 0; 514 char *interp = NULL; 515 u_long pos = 0, phsize; 516 size_t randomizequota = ELF_RANDOMIZE_LIMIT; 517 518 if (epp->ep_hdrvalid < sizeof(Elf_Ehdr)) 519 return (ENOEXEC); 520 521 if (ELFNAME(check_header)(eh) || 522 (eh->e_type != ET_EXEC && eh->e_type != ET_DYN)) 523 return (ENOEXEC); 524 525 /* 526 * check if vnode is in open for writing, because we want to demand- 527 * page out of it. if it is, don't do it, for various reasons. 528 */ 529 if (epp->ep_vp->v_writecount != 0) { 530 #ifdef DIAGNOSTIC 531 if (epp->ep_vp->v_flag & VTEXT) 532 panic("exec: a VTEXT vnode has writecount != 0"); 533 #endif 534 return (ETXTBSY); 535 } 536 /* 537 * Allocate space to hold all the program headers, and read them 538 * from the file 539 */ 540 ph = mallocarray(eh->e_phnum, sizeof(Elf_Phdr), M_TEMP, M_WAITOK); 541 phsize = eh->e_phnum * sizeof(Elf_Phdr); 542 543 if ((error = ELFNAME(read_from)(p, epp->ep_vp, eh->e_phoff, (caddr_t)ph, 544 phsize)) != 0) 545 goto bad; 546 547 epp->ep_tsize = ELFDEFNNAME(NO_ADDR); 548 epp->ep_dsize = ELFDEFNNAME(NO_ADDR); 549 550 for (i = 0, pp = ph; i < eh->e_phnum; i++, pp++) { 551 if (pp->p_type == PT_INTERP && !interp) { 552 if (pp->p_filesz < 2 || pp->p_filesz > MAXPATHLEN) 553 goto bad; 554 interp = pool_get(&namei_pool, PR_WAITOK); 555 if ((error = ELFNAME(read_from)(p, epp->ep_vp, 556 pp->p_offset, interp, pp->p_filesz)) != 0) { 557 goto bad; 558 } 559 if (interp[pp->p_filesz - 1] != '\0') 560 goto bad; 561 } else if (pp->p_type == PT_LOAD) { 562 if (pp->p_filesz > pp->p_memsz) { 563 error = EINVAL; 564 goto bad; 565 } 566 if (base_ph == NULL) 567 base_ph = pp; 568 } else if (pp->p_type == PT_PHDR) { 569 has_phdr = 1; 570 } 571 } 572 573 if (eh->e_type == ET_DYN) { 574 /* need phdr and load sections for PIE */ 575 if (!has_phdr || base_ph == NULL) { 576 error = EINVAL; 577 goto bad; 578 } 579 /* randomize exe_base for PIE */ 580 exe_base = uvm_map_pie(base_ph->p_align); 581 } 582 583 /* 584 * OK, we want a slightly different twist of the 585 * standard emulation package for "real" elf. 586 */ 587 epp->ep_emul = &ELFNAMEEND(emul); 588 pos = ELFDEFNNAME(NO_ADDR); 589 590 /* 591 * On the same architecture, we may be emulating different systems. 592 * See which one will accept this executable. 593 * 594 * Probe functions would normally see if the interpreter (if any) 595 * exists. Emulation packages may possibly replace the interpreter in 596 * *interp with a changed path (/emul/xxx/<path>), and also 597 * set the ep_emul field in the exec package structure. 598 */ 599 error = ENOEXEC; 600 if (eh->e_ident[EI_OSABI] != ELFOSABI_OPENBSD && 601 ELFNAME(os_pt_note)(p, epp, epp->ep_hdr, "OpenBSD", 8, 4) != 0) { 602 for (i = 0; ELFNAME(probes)[i].func != NULL && error; i++) 603 error = (*ELFNAME(probes)[i].func)(p, epp, interp, &pos); 604 if (error) 605 goto bad; 606 } 607 608 /* 609 * Load all the necessary sections 610 */ 611 for (i = 0, pp = ph; i < eh->e_phnum; i++, pp++) { 612 Elf_Addr addr, size = 0; 613 int prot = 0; 614 int flags = 0; 615 616 switch (pp->p_type) { 617 case PT_LOAD: 618 if (exe_base != 0) { 619 if (pp == base_ph) { 620 flags = VMCMD_BASE; 621 addr = exe_base; 622 } else { 623 flags = VMCMD_RELATIVE; 624 addr = pp->p_vaddr - base_ph->p_vaddr; 625 } 626 } else 627 addr = ELFDEFNNAME(NO_ADDR); 628 629 /* 630 * Calculates size of text and data segments 631 * by starting at first and going to end of last. 632 * 'rwx' sections are treated as data. 633 * this is correct for BSS_PLT, but may not be 634 * for DATA_PLT, is fine for TEXT_PLT. 635 */ 636 ELFNAME(load_psection)(&epp->ep_vmcmds, epp->ep_vp, 637 pp, &addr, &size, &prot, flags); 638 639 /* 640 * Update exe_base in case alignment was off. 641 * For PIE, addr is relative to exe_base so 642 * adjust it (non PIE exe_base is 0 so no change). 643 */ 644 if (flags == VMCMD_BASE) 645 exe_base = addr; 646 else 647 addr += exe_base; 648 649 /* 650 * Decide whether it's text or data by looking 651 * at the protection of the section 652 */ 653 if (prot & PROT_WRITE) { 654 /* data section */ 655 if (epp->ep_dsize == ELFDEFNNAME(NO_ADDR)) { 656 epp->ep_daddr = addr; 657 epp->ep_dsize = size; 658 } else { 659 if (addr < epp->ep_daddr) { 660 epp->ep_dsize = 661 epp->ep_dsize + 662 epp->ep_daddr - 663 addr; 664 epp->ep_daddr = addr; 665 } else 666 epp->ep_dsize = addr+size - 667 epp->ep_daddr; 668 } 669 } else if (prot & PROT_EXEC) { 670 /* text section */ 671 if (epp->ep_tsize == ELFDEFNNAME(NO_ADDR)) { 672 epp->ep_taddr = addr; 673 epp->ep_tsize = size; 674 } else { 675 if (addr < epp->ep_taddr) { 676 epp->ep_tsize = 677 epp->ep_tsize + 678 epp->ep_taddr - 679 addr; 680 epp->ep_taddr = addr; 681 } else 682 epp->ep_tsize = addr+size - 683 epp->ep_taddr; 684 } 685 } 686 break; 687 688 case PT_SHLIB: 689 error = ENOEXEC; 690 goto bad; 691 692 case PT_INTERP: 693 /* Already did this one */ 694 case PT_DYNAMIC: 695 case PT_NOTE: 696 break; 697 698 case PT_PHDR: 699 /* Note address of program headers (in text segment) */ 700 phdr = pp->p_vaddr; 701 break; 702 703 case PT_OPENBSD_RANDOMIZE: 704 if (ph[i].p_memsz > randomizequota) { 705 error = ENOMEM; 706 goto bad; 707 } 708 randomizequota -= ph[i].p_memsz; 709 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_randomize, 710 ph[i].p_memsz, ph[i].p_vaddr + exe_base, NULLVP, 0, 0); 711 break; 712 713 default: 714 /* 715 * Not fatal, we don't need to understand everything 716 * :-) 717 */ 718 break; 719 } 720 } 721 722 phdr += exe_base; 723 724 /* 725 * Strangely some linux programs may have all load sections marked 726 * writeable, in this case, textsize is not -1, but rather 0; 727 */ 728 if (epp->ep_tsize == ELFDEFNNAME(NO_ADDR)) 729 epp->ep_tsize = 0; 730 /* 731 * Another possibility is that it has all load sections marked 732 * read-only. Fake a zero-sized data segment right after the 733 * text segment. 734 */ 735 if (epp->ep_dsize == ELFDEFNNAME(NO_ADDR)) { 736 epp->ep_daddr = round_page(epp->ep_taddr + epp->ep_tsize); 737 epp->ep_dsize = 0; 738 } 739 740 epp->ep_interp = interp; 741 epp->ep_entry = eh->e_entry + exe_base; 742 743 /* 744 * Check if we found a dynamically linked binary and arrange to load 745 * its interpreter when the exec file is released. 746 */ 747 if (interp || eh->e_type == ET_DYN) { 748 struct elf_args *ap; 749 750 ap = malloc(sizeof(*ap), M_TEMP, M_WAITOK); 751 752 ap->arg_phaddr = phdr; 753 ap->arg_phentsize = eh->e_phentsize; 754 ap->arg_phnum = eh->e_phnum; 755 ap->arg_entry = eh->e_entry + exe_base; 756 ap->arg_interp = exe_base; 757 758 epp->ep_emul_arg = ap; 759 epp->ep_emul_argsize = sizeof *ap; 760 epp->ep_interp_pos = pos; 761 } 762 763 free(ph, M_TEMP, phsize); 764 vn_marktext(epp->ep_vp); 765 return (exec_setup_stack(p, epp)); 766 767 bad: 768 if (interp) 769 pool_put(&namei_pool, interp); 770 free(ph, M_TEMP, phsize); 771 kill_vmcmds(&epp->ep_vmcmds); 772 if (error == 0) 773 return (ENOEXEC); 774 return (error); 775 } 776 777 /* 778 * Phase II of load. It is now safe to load the interpreter. Info collected 779 * when loading the program is available for setup of the interpreter. 780 */ 781 int 782 ELFNAME2(exec,fixup)(struct proc *p, struct exec_package *epp) 783 { 784 char *interp; 785 int error = 0; 786 struct elf_args *ap; 787 AuxInfo ai[ELF_AUX_ENTRIES], *a; 788 Elf_Addr pos = epp->ep_interp_pos; 789 790 if (epp->ep_emul_arg == NULL) { 791 return (0); 792 } 793 794 interp = epp->ep_interp; 795 ap = epp->ep_emul_arg; 796 797 if (interp && 798 (error = ELFNAME(load_file)(p, interp, epp, ap, &pos)) != 0) { 799 free(ap, M_TEMP, epp->ep_emul_argsize); 800 pool_put(&namei_pool, interp); 801 kill_vmcmds(&epp->ep_vmcmds); 802 return (error); 803 } 804 /* 805 * We have to do this ourselves... 806 */ 807 error = exec_process_vmcmds(p, epp); 808 809 /* 810 * Push extra arguments on the stack needed by dynamically 811 * linked binaries 812 */ 813 if (error == 0) { 814 a = ai; 815 816 a->au_id = AUX_phdr; 817 a->au_v = ap->arg_phaddr; 818 a++; 819 820 a->au_id = AUX_phent; 821 a->au_v = ap->arg_phentsize; 822 a++; 823 824 a->au_id = AUX_phnum; 825 a->au_v = ap->arg_phnum; 826 a++; 827 828 a->au_id = AUX_pagesz; 829 a->au_v = PAGE_SIZE; 830 a++; 831 832 a->au_id = AUX_base; 833 a->au_v = ap->arg_interp; 834 a++; 835 836 a->au_id = AUX_flags; 837 a->au_v = 0; 838 a++; 839 840 a->au_id = AUX_entry; 841 a->au_v = ap->arg_entry; 842 a++; 843 844 a->au_id = AUX_null; 845 a->au_v = 0; 846 a++; 847 848 error = copyout(ai, epp->ep_emul_argp, sizeof ai); 849 } 850 free(ap, M_TEMP, epp->ep_emul_argsize); 851 if (interp) 852 pool_put(&namei_pool, interp); 853 return (error); 854 } 855 856 /* 857 * Older ELF binaries use EI_ABIVERSION (formerly EI_BRAND) to brand 858 * executables. Newer ELF binaries use EI_OSABI instead. 859 */ 860 char * 861 ELFNAME(check_brand)(Elf_Ehdr *eh) 862 { 863 if (eh->e_ident[EI_ABIVERSION] == '\0') 864 return (NULL); 865 return (&eh->e_ident[EI_ABIVERSION]); 866 } 867 868 int 869 ELFNAME(os_pt_note)(struct proc *p, struct exec_package *epp, Elf_Ehdr *eh, 870 char *os_name, size_t name_size, size_t desc_size) 871 { 872 Elf_Phdr *hph, *ph; 873 Elf_Note *np = NULL; 874 size_t phsize; 875 int error; 876 877 hph = mallocarray(eh->e_phnum, sizeof(Elf_Phdr), M_TEMP, M_WAITOK); 878 phsize = eh->e_phnum * sizeof(Elf_Phdr); 879 if ((error = ELFNAME(read_from)(p, epp->ep_vp, eh->e_phoff, 880 (caddr_t)hph, phsize)) != 0) 881 goto out1; 882 883 for (ph = hph; ph < &hph[eh->e_phnum]; ph++) { 884 if (ph->p_type == PT_OPENBSD_WXNEEDED) { 885 int wxallowed = (epp->ep_vp->v_mount && 886 (epp->ep_vp->v_mount->mnt_flag & MNT_WXALLOWED)); 887 888 if (!wxallowed) { 889 log(LOG_NOTICE, 890 "%s(%d): W^X binary outside wxallowed mountpoint\n", 891 epp->ep_name, p->p_pid); 892 error = ENOEXEC; 893 goto out1; 894 } 895 epp->ep_flags |= EXEC_WXNEEDED; 896 break; 897 } 898 } 899 900 for (ph = hph; ph < &hph[eh->e_phnum]; ph++) { 901 if (ph->p_type != PT_NOTE || 902 ph->p_filesz > 1024 || 903 ph->p_filesz < sizeof(Elf_Note) + name_size) 904 continue; 905 906 np = malloc(ph->p_filesz, M_TEMP, M_WAITOK); 907 if ((error = ELFNAME(read_from)(p, epp->ep_vp, ph->p_offset, 908 (caddr_t)np, ph->p_filesz)) != 0) 909 goto out2; 910 911 #if 0 912 if (np->type != ELF_NOTE_TYPE_OSVERSION) { 913 free(np, M_TEMP, ph->p_filesz); 914 np = NULL; 915 continue; 916 } 917 #endif 918 919 /* Check the name and description sizes. */ 920 if (np->namesz != name_size || 921 np->descsz != desc_size) 922 goto out3; 923 924 if (memcmp((np + 1), os_name, name_size)) 925 goto out3; 926 927 /* XXX: We could check for the specific emulation here */ 928 /* All checks succeeded. */ 929 error = 0; 930 goto out2; 931 } 932 933 out3: 934 error = ENOEXEC; 935 out2: 936 free(np, M_TEMP, ph->p_filesz); 937 out1: 938 free(hph, M_TEMP, phsize); 939 return error; 940 } 941 942 struct countsegs_state { 943 int npsections; 944 }; 945 946 int ELFNAMEEND(coredump_countsegs)(struct proc *, void *, 947 struct uvm_coredump_state *); 948 949 struct writesegs_state { 950 Elf_Phdr *psections; 951 off_t secoff; 952 }; 953 954 int ELFNAMEEND(coredump_writeseghdrs)(struct proc *, void *, 955 struct uvm_coredump_state *); 956 957 int ELFNAMEEND(coredump_notes)(struct proc *, void *, size_t *); 958 int ELFNAMEEND(coredump_note)(struct proc *, void *, size_t *); 959 int ELFNAMEEND(coredump_writenote)(struct proc *, void *, Elf_Note *, 960 const char *, void *); 961 962 #define ELFROUNDSIZE 4 /* XXX Should it be sizeof(Elf_Word)? */ 963 #define elfround(x) roundup((x), ELFROUNDSIZE) 964 965 int 966 ELFNAMEEND(coredump)(struct proc *p, void *cookie) 967 { 968 #ifdef SMALL_KERNEL 969 return EPERM; 970 #else 971 Elf_Ehdr ehdr; 972 Elf_Phdr *psections = NULL; 973 struct countsegs_state cs; 974 struct writesegs_state ws; 975 off_t notestart, secstart, offset; 976 size_t notesize, psectionslen; 977 int error, i; 978 979 /* 980 * We have to make a total of 3 passes across the map: 981 * 982 * 1. Count the number of map entries (the number of 983 * PT_LOAD sections). 984 * 985 * 2. Write the P-section headers. 986 * 987 * 3. Write the P-sections. 988 */ 989 990 /* Pass 1: count the entries. */ 991 cs.npsections = 0; 992 error = uvm_coredump_walkmap(p, NULL, 993 ELFNAMEEND(coredump_countsegs), &cs); 994 if (error) 995 goto out; 996 997 /* Count the PT_NOTE section. */ 998 cs.npsections++; 999 1000 /* Get the size of the notes. */ 1001 error = ELFNAMEEND(coredump_notes)(p, NULL, ¬esize); 1002 if (error) 1003 goto out; 1004 1005 memset(&ehdr, 0, sizeof(ehdr)); 1006 memcpy(ehdr.e_ident, ELFMAG, SELFMAG); 1007 ehdr.e_ident[EI_CLASS] = ELF_TARG_CLASS; 1008 ehdr.e_ident[EI_DATA] = ELF_TARG_DATA; 1009 ehdr.e_ident[EI_VERSION] = EV_CURRENT; 1010 /* XXX Should be the OSABI/ABI version of the executable. */ 1011 ehdr.e_ident[EI_OSABI] = ELFOSABI_SYSV; 1012 ehdr.e_ident[EI_ABIVERSION] = 0; 1013 ehdr.e_type = ET_CORE; 1014 /* XXX This should be the e_machine of the executable. */ 1015 ehdr.e_machine = ELF_TARG_MACH; 1016 ehdr.e_version = EV_CURRENT; 1017 ehdr.e_entry = 0; 1018 ehdr.e_phoff = sizeof(ehdr); 1019 ehdr.e_shoff = 0; 1020 ehdr.e_flags = 0; 1021 ehdr.e_ehsize = sizeof(ehdr); 1022 ehdr.e_phentsize = sizeof(Elf_Phdr); 1023 ehdr.e_phnum = cs.npsections; 1024 ehdr.e_shentsize = 0; 1025 ehdr.e_shnum = 0; 1026 ehdr.e_shstrndx = 0; 1027 1028 /* Write out the ELF header. */ 1029 error = coredump_write(cookie, UIO_SYSSPACE, &ehdr, sizeof(ehdr)); 1030 if (error) 1031 goto out; 1032 1033 psections = mallocarray(cs.npsections, sizeof(Elf_Phdr), 1034 M_TEMP, M_WAITOK|M_ZERO); 1035 psectionslen = cs.npsections * sizeof(Elf_Phdr); 1036 1037 offset = sizeof(ehdr); 1038 notestart = offset + psectionslen; 1039 secstart = notestart + notesize; 1040 1041 /* Pass 2: now write the P-section headers. */ 1042 ws.secoff = secstart; 1043 ws.psections = psections; 1044 error = uvm_coredump_walkmap(p, cookie, 1045 ELFNAMEEND(coredump_writeseghdrs), &ws); 1046 if (error) 1047 goto out; 1048 1049 /* Write out the PT_NOTE header. */ 1050 ws.psections->p_type = PT_NOTE; 1051 ws.psections->p_offset = notestart; 1052 ws.psections->p_vaddr = 0; 1053 ws.psections->p_paddr = 0; 1054 ws.psections->p_filesz = notesize; 1055 ws.psections->p_memsz = 0; 1056 ws.psections->p_flags = PF_R; 1057 ws.psections->p_align = ELFROUNDSIZE; 1058 1059 error = coredump_write(cookie, UIO_SYSSPACE, psections, psectionslen); 1060 if (error) 1061 goto out; 1062 1063 #ifdef DIAGNOSTIC 1064 offset += psectionslen; 1065 if (offset != notestart) 1066 panic("coredump: offset %lld != notestart %lld", 1067 (long long) offset, (long long) notestart); 1068 #endif 1069 1070 /* Write out the notes. */ 1071 error = ELFNAMEEND(coredump_notes)(p, cookie, ¬esize); 1072 if (error) 1073 goto out; 1074 1075 #ifdef DIAGNOSTIC 1076 offset += notesize; 1077 if (offset != secstart) 1078 panic("coredump: offset %lld != secstart %lld", 1079 (long long) offset, (long long) secstart); 1080 #endif 1081 1082 /* Pass 3: finally, write the sections themselves. */ 1083 for (i = 0; i < cs.npsections - 1; i++) { 1084 if (psections[i].p_filesz == 0) 1085 continue; 1086 1087 #ifdef DIAGNOSTIC 1088 if (offset != psections[i].p_offset) 1089 panic("coredump: offset %lld != p_offset[%d] %lld", 1090 (long long) offset, i, 1091 (long long) psections[i].p_filesz); 1092 #endif 1093 1094 error = coredump_write(cookie, UIO_USERSPACE, 1095 (void *)(vaddr_t)psections[i].p_vaddr, 1096 psections[i].p_filesz); 1097 if (error) 1098 goto out; 1099 1100 coredump_unmap(cookie, (vaddr_t)psections[i].p_vaddr, 1101 (vaddr_t)psections[i].p_vaddr + psections[i].p_filesz); 1102 1103 #ifdef DIAGNOSTIC 1104 offset += psections[i].p_filesz; 1105 #endif 1106 } 1107 1108 out: 1109 free(psections, M_TEMP, psectionslen); 1110 return (error); 1111 #endif 1112 } 1113 1114 int 1115 ELFNAMEEND(coredump_countsegs)(struct proc *p, void *iocookie, 1116 struct uvm_coredump_state *us) 1117 { 1118 #ifndef SMALL_KERNEL 1119 struct countsegs_state *cs = us->cookie; 1120 1121 cs->npsections++; 1122 #endif 1123 return (0); 1124 } 1125 1126 int 1127 ELFNAMEEND(coredump_writeseghdrs)(struct proc *p, void *iocookie, 1128 struct uvm_coredump_state *us) 1129 { 1130 #ifndef SMALL_KERNEL 1131 struct writesegs_state *ws = us->cookie; 1132 Elf_Phdr phdr; 1133 vsize_t size, realsize; 1134 1135 size = us->end - us->start; 1136 realsize = us->realend - us->start; 1137 1138 phdr.p_type = PT_LOAD; 1139 phdr.p_offset = ws->secoff; 1140 phdr.p_vaddr = us->start; 1141 phdr.p_paddr = 0; 1142 phdr.p_filesz = realsize; 1143 phdr.p_memsz = size; 1144 phdr.p_flags = 0; 1145 if (us->prot & PROT_READ) 1146 phdr.p_flags |= PF_R; 1147 if (us->prot & PROT_WRITE) 1148 phdr.p_flags |= PF_W; 1149 if (us->prot & PROT_EXEC) 1150 phdr.p_flags |= PF_X; 1151 phdr.p_align = PAGE_SIZE; 1152 1153 ws->secoff += phdr.p_filesz; 1154 *ws->psections++ = phdr; 1155 #endif 1156 1157 return (0); 1158 } 1159 1160 int 1161 ELFNAMEEND(coredump_notes)(struct proc *p, void *iocookie, size_t *sizep) 1162 { 1163 #ifndef SMALL_KERNEL 1164 struct ps_strings pss; 1165 struct iovec iov; 1166 struct uio uio; 1167 struct elfcore_procinfo cpi; 1168 Elf_Note nhdr; 1169 struct process *pr = p->p_p; 1170 struct proc *q; 1171 size_t size, notesize; 1172 int error; 1173 1174 size = 0; 1175 1176 /* First, write an elfcore_procinfo. */ 1177 notesize = sizeof(nhdr) + elfround(sizeof("OpenBSD")) + 1178 elfround(sizeof(cpi)); 1179 if (iocookie) { 1180 memset(&cpi, 0, sizeof(cpi)); 1181 1182 cpi.cpi_version = ELFCORE_PROCINFO_VERSION; 1183 cpi.cpi_cpisize = sizeof(cpi); 1184 cpi.cpi_signo = p->p_sisig; 1185 cpi.cpi_sigcode = p->p_sicode; 1186 1187 cpi.cpi_sigpend = p->p_siglist; 1188 cpi.cpi_sigmask = p->p_sigmask; 1189 cpi.cpi_sigignore = pr->ps_sigacts->ps_sigignore; 1190 cpi.cpi_sigcatch = pr->ps_sigacts->ps_sigcatch; 1191 1192 cpi.cpi_pid = pr->ps_pid; 1193 cpi.cpi_ppid = pr->ps_pptr->ps_pid; 1194 cpi.cpi_pgrp = pr->ps_pgid; 1195 if (pr->ps_session->s_leader) 1196 cpi.cpi_sid = pr->ps_session->s_leader->ps_pid; 1197 else 1198 cpi.cpi_sid = 0; 1199 1200 cpi.cpi_ruid = p->p_ucred->cr_ruid; 1201 cpi.cpi_euid = p->p_ucred->cr_uid; 1202 cpi.cpi_svuid = p->p_ucred->cr_svuid; 1203 1204 cpi.cpi_rgid = p->p_ucred->cr_rgid; 1205 cpi.cpi_egid = p->p_ucred->cr_gid; 1206 cpi.cpi_svgid = p->p_ucred->cr_svgid; 1207 1208 (void)strlcpy(cpi.cpi_name, p->p_comm, sizeof(cpi.cpi_name)); 1209 1210 nhdr.namesz = sizeof("OpenBSD"); 1211 nhdr.descsz = sizeof(cpi); 1212 nhdr.type = NT_OPENBSD_PROCINFO; 1213 1214 error = ELFNAMEEND(coredump_writenote)(p, iocookie, &nhdr, 1215 "OpenBSD", &cpi); 1216 if (error) 1217 return (error); 1218 } 1219 size += notesize; 1220 1221 /* Second, write an NT_OPENBSD_AUXV note. */ 1222 notesize = sizeof(nhdr) + elfround(sizeof("OpenBSD")) + 1223 elfround(pr->ps_emul->e_arglen * sizeof(char *)); 1224 if (iocookie) { 1225 iov.iov_base = &pss; 1226 iov.iov_len = sizeof(pss); 1227 uio.uio_iov = &iov; 1228 uio.uio_iovcnt = 1; 1229 uio.uio_offset = (off_t)pr->ps_strings; 1230 uio.uio_resid = sizeof(pss); 1231 uio.uio_segflg = UIO_SYSSPACE; 1232 uio.uio_rw = UIO_READ; 1233 uio.uio_procp = NULL; 1234 1235 error = uvm_io(&p->p_vmspace->vm_map, &uio, 0); 1236 if (error) 1237 return (error); 1238 1239 if (pss.ps_envstr == NULL) 1240 return (EIO); 1241 1242 nhdr.namesz = sizeof("OpenBSD"); 1243 nhdr.descsz = pr->ps_emul->e_arglen * sizeof(char *); 1244 nhdr.type = NT_OPENBSD_AUXV; 1245 1246 error = coredump_write(iocookie, UIO_SYSSPACE, 1247 &nhdr, sizeof(nhdr)); 1248 if (error) 1249 return (error); 1250 1251 error = coredump_write(iocookie, UIO_SYSSPACE, 1252 "OpenBSD", elfround(nhdr.namesz)); 1253 if (error) 1254 return (error); 1255 1256 error = coredump_write(iocookie, UIO_USERSPACE, 1257 pss.ps_envstr + pss.ps_nenvstr + 1, nhdr.descsz); 1258 if (error) 1259 return (error); 1260 } 1261 size += notesize; 1262 1263 #ifdef PT_WCOOKIE 1264 notesize = sizeof(nhdr) + elfround(sizeof("OpenBSD")) + 1265 elfround(sizeof(register_t)); 1266 if (iocookie) { 1267 register_t wcookie; 1268 1269 nhdr.namesz = sizeof("OpenBSD"); 1270 nhdr.descsz = sizeof(register_t); 1271 nhdr.type = NT_OPENBSD_WCOOKIE; 1272 1273 wcookie = process_get_wcookie(p); 1274 error = ELFNAMEEND(coredump_writenote)(p, iocookie, &nhdr, 1275 "OpenBSD", &wcookie); 1276 if (error) 1277 return (error); 1278 } 1279 size += notesize; 1280 #endif 1281 1282 /* 1283 * Now write the register info for the thread that caused the 1284 * coredump. 1285 */ 1286 error = ELFNAMEEND(coredump_note)(p, iocookie, ¬esize); 1287 if (error) 1288 return (error); 1289 size += notesize; 1290 1291 /* 1292 * Now, for each thread, write the register info and any other 1293 * per-thread notes. Since we're dumping core, all the other 1294 * threads in the process have been stopped and the list can't 1295 * change. 1296 */ 1297 TAILQ_FOREACH(q, &pr->ps_threads, p_thr_link) { 1298 if (q == p) /* we've taken care of this thread */ 1299 continue; 1300 error = ELFNAMEEND(coredump_note)(q, iocookie, ¬esize); 1301 if (error) 1302 return (error); 1303 size += notesize; 1304 } 1305 1306 *sizep = size; 1307 #endif 1308 return (0); 1309 } 1310 1311 int 1312 ELFNAMEEND(coredump_note)(struct proc *p, void *iocookie, size_t *sizep) 1313 { 1314 #ifndef SMALL_KERNEL 1315 Elf_Note nhdr; 1316 int size, notesize, error; 1317 int namesize; 1318 char name[64+ELFROUNDSIZE]; 1319 struct reg intreg; 1320 #ifdef PT_GETFPREGS 1321 struct fpreg freg; 1322 #endif 1323 1324 size = 0; 1325 1326 snprintf(name, sizeof(name)-ELFROUNDSIZE, "%s@%d", 1327 "OpenBSD", p->p_pid); 1328 namesize = strlen(name) + 1; 1329 memset(name + namesize, 0, elfround(namesize) - namesize); 1330 1331 notesize = sizeof(nhdr) + elfround(namesize) + elfround(sizeof(intreg)); 1332 if (iocookie) { 1333 error = process_read_regs(p, &intreg); 1334 if (error) 1335 return (error); 1336 1337 nhdr.namesz = namesize; 1338 nhdr.descsz = sizeof(intreg); 1339 nhdr.type = NT_OPENBSD_REGS; 1340 1341 error = ELFNAMEEND(coredump_writenote)(p, iocookie, &nhdr, 1342 name, &intreg); 1343 if (error) 1344 return (error); 1345 1346 } 1347 size += notesize; 1348 1349 #ifdef PT_GETFPREGS 1350 notesize = sizeof(nhdr) + elfround(namesize) + elfround(sizeof(freg)); 1351 if (iocookie) { 1352 error = process_read_fpregs(p, &freg); 1353 if (error) 1354 return (error); 1355 1356 nhdr.namesz = namesize; 1357 nhdr.descsz = sizeof(freg); 1358 nhdr.type = NT_OPENBSD_FPREGS; 1359 1360 error = ELFNAMEEND(coredump_writenote)(p, iocookie, &nhdr, 1361 name, &freg); 1362 if (error) 1363 return (error); 1364 } 1365 size += notesize; 1366 #endif 1367 1368 *sizep = size; 1369 /* XXX Add hook for machdep per-LWP notes. */ 1370 #endif 1371 return (0); 1372 } 1373 1374 int 1375 ELFNAMEEND(coredump_writenote)(struct proc *p, void *cookie, Elf_Note *nhdr, 1376 const char *name, void *data) 1377 { 1378 #ifdef SMALL_KERNEL 1379 return EPERM; 1380 #else 1381 int error; 1382 1383 error = coredump_write(cookie, UIO_SYSSPACE, nhdr, sizeof(*nhdr)); 1384 if (error) 1385 return error; 1386 1387 error = coredump_write(cookie, UIO_SYSSPACE, name, 1388 elfround(nhdr->namesz)); 1389 if (error) 1390 return error; 1391 1392 return coredump_write(cookie, UIO_SYSSPACE, data, nhdr->descsz); 1393 #endif 1394 } 1395