exec_elf32.c revision 1.60
1/* $NetBSD: exec_elf32.c,v 1.60 2000/12/11 05:29:02 mycroft Exp $ */ 2 3/*- 4 * Copyright (c) 1994, 2000 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Christos Zoulas. 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. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39/* 40 * Copyright (c) 1996 Christopher G. Demetriou 41 * All rights reserved. 42 * 43 * Redistribution and use in source and binary forms, with or without 44 * modification, are permitted provided that the following conditions 45 * are met: 46 * 1. Redistributions of source code must retain the above copyright 47 * notice, this list of conditions and the following disclaimer. 48 * 2. Redistributions in binary form must reproduce the above copyright 49 * notice, this list of conditions and the following disclaimer in the 50 * documentation and/or other materials provided with the distribution. 51 * 3. The name of the author may not be used to endorse or promote products 52 * derived from this software without specific prior written permission 53 * 54 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 55 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 56 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 57 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 58 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 59 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 60 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 61 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 62 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 63 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 64 */ 65 66/* If not included by exec_elf64.c, ELFSIZE won't be defined. */ 67#ifndef ELFSIZE 68#define ELFSIZE 32 69#endif 70 71#include <sys/param.h> 72#include <sys/proc.h> 73#include <sys/malloc.h> 74#include <sys/namei.h> 75#include <sys/vnode.h> 76#include <sys/exec.h> 77#include <sys/exec_elf.h> 78#include <sys/syscall.h> 79#include <sys/signalvar.h> 80#include <sys/mount.h> 81#include <sys/stat.h> 82 83#include <machine/cpu.h> 84#include <machine/reg.h> 85 86extern const struct emul emul_netbsd; 87 88int ELFNAME(check_header)(Elf_Ehdr *, int); 89int ELFNAME(load_file)(struct proc *, struct exec_package *, char *, 90 struct exec_vmcmd_set *, u_long *, struct elf_args *, Elf_Addr *); 91void ELFNAME(load_psection)(struct exec_vmcmd_set *, struct vnode *, 92 const Elf_Phdr *, Elf_Addr *, u_long *, int *, int); 93 94int ELFNAME2(netbsd,signature)(struct proc *, struct exec_package *, 95 Elf_Ehdr *); 96int ELFNAME2(netbsd,probe)(struct proc *, struct exec_package *, 97 void *, char *, vaddr_t *); 98 99/* round up and down to page boundaries. */ 100#define ELF_ROUND(a, b) (((a) + (b) - 1) & ~((b) - 1)) 101#define ELF_TRUNC(a, b) ((a) & ~((b) - 1)) 102 103/* 104 * Copy arguments onto the stack in the normal way, but add some 105 * extra information in case of dynamic binding. 106 */ 107void * 108ELFNAME(copyargs)(struct exec_package *pack, struct ps_strings *arginfo, 109 void *stack, void *argp) 110{ 111 size_t len; 112 AuxInfo ai[ELF_AUX_ENTRIES], *a; 113 struct elf_args *ap; 114 115 stack = copyargs(pack, arginfo, stack, argp); 116 if (!stack) 117 return NULL; 118 119 a = ai; 120 121 /* 122 * Push extra arguments on the stack needed by dynamically 123 * linked binaries 124 */ 125 if ((ap = (struct elf_args *)pack->ep_emul_arg)) { 126 127 a->a_type = AT_PHDR; 128 a->a_v = ap->arg_phaddr; 129 a++; 130 131 a->a_type = AT_PHENT; 132 a->a_v = ap->arg_phentsize; 133 a++; 134 135 a->a_type = AT_PHNUM; 136 a->a_v = ap->arg_phnum; 137 a++; 138 139 a->a_type = AT_PAGESZ; 140 a->a_v = PAGE_SIZE; 141 a++; 142 143 a->a_type = AT_BASE; 144 a->a_v = ap->arg_interp; 145 a++; 146 147 a->a_type = AT_FLAGS; 148 a->a_v = 0; 149 a++; 150 151 a->a_type = AT_ENTRY; 152 a->a_v = ap->arg_entry; 153 a++; 154 155 free((char *)ap, M_TEMP); 156 pack->ep_emul_arg = NULL; 157 } 158 159 a->a_type = AT_NULL; 160 a->a_v = 0; 161 a++; 162 163 len = (a - ai) * sizeof(AuxInfo); 164 if (copyout(ai, stack, len)) 165 return NULL; 166 stack = (caddr_t)stack + len; 167 168 return stack; 169} 170 171/* 172 * elf_check_header(): 173 * 174 * Check header for validity; return 0 of ok ENOEXEC if error 175 */ 176int 177ELFNAME(check_header)(Elf_Ehdr *eh, int type) 178{ 179 180 if (memcmp(eh->e_ident, ELFMAG, SELFMAG) != 0 || 181 eh->e_ident[EI_CLASS] != ELFCLASS) 182 return ENOEXEC; 183 184 switch (eh->e_machine) { 185 186 ELFDEFNNAME(MACHDEP_ID_CASES) 187 188 default: 189 return ENOEXEC; 190 } 191 192 if (eh->e_type != type) 193 return ENOEXEC; 194 195 return 0; 196} 197 198/* 199 * elf_load_psection(): 200 * 201 * Load a psection at the appropriate address 202 */ 203void 204ELFNAME(load_psection)(struct exec_vmcmd_set *vcset, struct vnode *vp, 205 const Elf_Phdr *ph, Elf_Addr *addr, u_long *size, int *prot, int flags) 206{ 207 u_long uaddr, msize, psize, rm, rf; 208 long diff, offset; 209 210 /* 211 * If the user specified an address, then we load there. 212 */ 213 if (*addr != ELFDEFNNAME(NO_ADDR)) { 214 if (ph->p_align > 1) { 215 *addr = ELF_TRUNC(*addr, ph->p_align); 216 uaddr = ELF_TRUNC(ph->p_vaddr, ph->p_align); 217 } else 218 uaddr = ph->p_vaddr; 219 diff = ph->p_vaddr - uaddr; 220 } else { 221 *addr = uaddr = ph->p_vaddr; 222 if (ph->p_align > 1) 223 *addr = ELF_TRUNC(uaddr, ph->p_align); 224 diff = uaddr - *addr; 225 } 226 227 *prot |= (ph->p_flags & PF_R) ? VM_PROT_READ : 0; 228 *prot |= (ph->p_flags & PF_W) ? VM_PROT_WRITE : 0; 229 *prot |= (ph->p_flags & PF_X) ? VM_PROT_EXECUTE : 0; 230 231 offset = ph->p_offset - diff; 232 *size = ph->p_filesz + diff; 233 msize = ph->p_memsz + diff; 234 psize = round_page(*size); 235 236 if ((ph->p_flags & PF_W) != 0) { 237 /* 238 * Because the pagedvn pager can't handle zero fill of the last 239 * data page if it's not page aligned we map the last page 240 * readvn. 241 */ 242 psize = trunc_page(*size); 243 } 244 if (psize > 0) { 245 NEW_VMCMD2(vcset, vmcmd_map_pagedvn, psize, *addr, vp, 246 offset, *prot, flags); 247 } 248 if (psize < *size) { 249 NEW_VMCMD2(vcset, vmcmd_map_readvn, *size - psize, 250 *addr + psize, vp, offset + psize, *prot, 251 psize > 0 ? flags & VMCMD_RELATIVE : flags); 252 } 253 254 /* 255 * Check if we need to extend the size of the segment 256 */ 257 rm = round_page(*addr + msize); 258 rf = round_page(*addr + *size); 259 260 if (rm != rf) { 261 NEW_VMCMD2(vcset, vmcmd_map_zero, rm - rf, rf, NULLVP, 262 0, *prot, flags & VMCMD_RELATIVE); 263 *size = msize; 264 } 265} 266 267/* 268 * elf_read_from(): 269 * 270 * Read from vnode into buffer at offset. 271 */ 272int 273ELFNAME(read_from)(struct proc *p, struct vnode *vp, u_long off, 274 caddr_t buf, int size) 275{ 276 int error; 277 size_t resid; 278 279 if ((error = vn_rdwr(UIO_READ, vp, buf, size, off, UIO_SYSSPACE, 280 0, p->p_ucred, &resid, p)) != 0) 281 return error; 282 /* 283 * See if we got all of it 284 */ 285 if (resid != 0) 286 return ENOEXEC; 287 return 0; 288} 289 290/* 291 * elf_load_file(): 292 * 293 * Load a file (interpreter/library) pointed to by path 294 * [stolen from coff_load_shlib()]. Made slightly generic 295 * so it might be used externally. 296 */ 297int 298ELFNAME(load_file)(struct proc *p, struct exec_package *epp, char *path, 299 struct exec_vmcmd_set *vcset, u_long *entry, struct elf_args *ap, 300 Elf_Addr *last) 301{ 302 int error, i; 303 struct nameidata nd; 304 struct vnode *vp; 305 struct vattr attr; 306 Elf_Ehdr eh; 307 Elf_Phdr *ph = NULL; 308 Elf_Phdr *base_ph = NULL; 309 u_long phsize; 310 char *bp = NULL; 311 Elf_Addr addr = *last; 312 313 bp = path; 314 /* 315 * 1. open file 316 * 2. read filehdr 317 * 3. map text, data, and bss out of it using VM_* 318 */ 319 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, path, p); 320 if ((error = namei(&nd)) != 0) 321 return error; 322 vp = nd.ni_vp; 323 324 /* 325 * Similarly, if it's not marked as executable, or it's not a regular 326 * file, we don't allow it to be used. 327 */ 328 if (vp->v_type != VREG) { 329 error = EACCES; 330 goto badunlock; 331 } 332 if ((error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p)) != 0) 333 goto badunlock; 334 335 /* get attributes */ 336 if ((error = VOP_GETATTR(vp, &attr, p->p_ucred, p)) != 0) 337 goto badunlock; 338 339 /* 340 * Check mount point. Though we're not trying to exec this binary, 341 * we will be executing code from it, so if the mount point 342 * disallows execution or set-id-ness, we punt or kill the set-id. 343 */ 344 if (vp->v_mount->mnt_flag & MNT_NOEXEC) { 345 error = EACCES; 346 goto badunlock; 347 } 348 if (vp->v_mount->mnt_flag & MNT_NOSUID) 349 epp->ep_vap->va_mode &= ~(S_ISUID | S_ISGID); 350 351#ifdef notyet /* XXX cgd 960926 */ 352 XXX cgd 960926: (maybe) VOP_OPEN it (and VOP_CLOSE in copyargs?) 353#endif 354 VOP_UNLOCK(vp, 0); 355 356 if ((error = ELFNAME(read_from)(p, vp, 0, (caddr_t) &eh, 357 sizeof(eh))) != 0) 358 goto bad; 359 360 if ((error = ELFNAME(check_header)(&eh, ET_DYN)) != 0) 361 goto bad; 362 363 phsize = eh.e_phnum * sizeof(Elf_Phdr); 364 ph = (Elf_Phdr *)malloc(phsize, M_TEMP, M_WAITOK); 365 366 if ((error = ELFNAME(read_from)(p, vp, eh.e_phoff, 367 (caddr_t) ph, phsize)) != 0) 368 goto bad; 369 370 /* 371 * Load all the necessary sections 372 */ 373 for (i = 0; i < eh.e_phnum; i++) { 374 u_long size = 0; 375 int prot = 0; 376 int flags; 377 378 switch (ph[i].p_type) { 379 case PT_LOAD: 380 if (base_ph == NULL) { 381 addr = *last; 382 flags = VMCMD_BASE; 383 } else { 384 addr = ph[i].p_vaddr - base_ph->p_vaddr; 385 flags = VMCMD_RELATIVE; 386 } 387 ELFNAME(load_psection)(vcset, vp, &ph[i], &addr, 388 &size, &prot, flags); 389 /* If entry is within this section it must be text */ 390 if (eh.e_entry >= ph[i].p_vaddr && 391 eh.e_entry < (ph[i].p_vaddr + size)) { 392 /* XXX */ 393 *entry = addr + eh.e_entry; 394#ifdef mips 395 *entry -= ph[i].p_vaddr; 396#endif 397 ap->arg_interp = addr; 398 } 399 if (base_ph == NULL) 400 base_ph = &ph[i]; 401 addr += size; 402 break; 403 404 case PT_DYNAMIC: 405 case PT_PHDR: 406 case PT_NOTE: 407 break; 408 409 default: 410 break; 411 } 412 } 413 414 free((char *)ph, M_TEMP); 415 *last = addr; 416 vrele(vp); 417 return 0; 418 419badunlock: 420 VOP_UNLOCK(vp, 0); 421 422bad: 423 if (ph != NULL) 424 free((char *)ph, M_TEMP); 425#ifdef notyet /* XXX cgd 960926 */ 426 (maybe) VOP_CLOSE it 427#endif 428 vrele(vp); 429 return error; 430} 431 432/* 433 * exec_elf_makecmds(): Prepare an Elf binary's exec package 434 * 435 * First, set of the various offsets/lengths in the exec package. 436 * 437 * Then, mark the text image busy (so it can be demand paged) or error 438 * out if this is not possible. Finally, set up vmcmds for the 439 * text, data, bss, and stack segments. 440 */ 441int 442ELFNAME2(exec,makecmds)(struct proc *p, struct exec_package *epp) 443{ 444 Elf_Ehdr *eh = epp->ep_hdr; 445 Elf_Phdr *ph, *pp; 446 Elf_Addr phdr = 0, pos = 0; 447 int error, i, nload; 448 char *interp = NULL; 449 u_long phsize; 450 451 if (epp->ep_hdrvalid < sizeof(Elf_Ehdr)) 452 return ENOEXEC; 453 454 /* 455 * XXX allow for executing shared objects. It seems silly 456 * but other ELF-based systems allow it as well. 457 */ 458 if (ELFNAME(check_header)(eh, ET_EXEC) != 0 && 459 ELFNAME(check_header)(eh, ET_DYN) != 0) 460 return ENOEXEC; 461 462 /* 463 * check if vnode is in open for writing, because we want to 464 * demand-page out of it. if it is, don't do it, for various 465 * reasons 466 */ 467 if (epp->ep_vp->v_writecount != 0) { 468#ifdef DIAGNOSTIC 469 if (epp->ep_vp->v_flag & VTEXT) 470 panic("exec: a VTEXT vnode has writecount != 0\n"); 471#endif 472 return ETXTBSY; 473 } 474 /* 475 * Allocate space to hold all the program headers, and read them 476 * from the file 477 */ 478 phsize = eh->e_phnum * sizeof(Elf_Phdr); 479 ph = (Elf_Phdr *)malloc(phsize, M_TEMP, M_WAITOK); 480 481 if ((error = ELFNAME(read_from)(p, epp->ep_vp, eh->e_phoff, 482 (caddr_t) ph, phsize)) != 0) 483 goto bad; 484 485 epp->ep_taddr = epp->ep_tsize = ELFDEFNNAME(NO_ADDR); 486 epp->ep_daddr = epp->ep_dsize = ELFDEFNNAME(NO_ADDR); 487 488 MALLOC(interp, char *, MAXPATHLEN, M_TEMP, M_WAITOK); 489 interp[0] = '\0'; 490 491 for (i = 0; i < eh->e_phnum; i++) { 492 pp = &ph[i]; 493 if (pp->p_type == PT_INTERP) { 494 if (pp->p_filesz >= MAXPATHLEN) 495 goto bad; 496 if ((error = ELFNAME(read_from)(p, epp->ep_vp, 497 pp->p_offset, (caddr_t) interp, 498 pp->p_filesz)) != 0) 499 goto bad; 500 break; 501 } 502 } 503 504 /* 505 * On the same architecture, we may be emulating different systems. 506 * See which one will accept this executable. This currently only 507 * applies to SVR4, and IBCS2 on the i386 and Linux on the i386 508 * and the Alpha. 509 * 510 * Probe functions would normally see if the interpreter (if any) 511 * exists. Emulation packages may possibly replace the interpreter in 512 * interp[] with a changed path (/emul/xxx/<path>). 513 */ 514 if (!epp->ep_esch->u.elf_probe_func) { 515 pos = ELFDEFNNAME(NO_ADDR); 516 } else { 517 error = (*epp->ep_esch->u.elf_probe_func)(p, epp, eh, interp, 518 (vaddr_t *)&pos); 519 if (error) 520 goto bad; 521 } 522 523 /* 524 * Load all the necessary sections 525 */ 526 for (i = nload = 0; i < eh->e_phnum; i++) { 527 Elf_Addr addr = ELFDEFNNAME(NO_ADDR); 528 u_long size = 0; 529 int prot = 0; 530 531 pp = &ph[i]; 532 533 switch (ph[i].p_type) { 534 case PT_LOAD: 535 /* 536 * XXX 537 * Can handle only 2 sections: text and data 538 */ 539 if (nload++ == 2) 540 goto bad; 541 ELFNAME(load_psection)(&epp->ep_vmcmds, epp->ep_vp, 542 &ph[i], &addr, &size, &prot, 0); 543 544 /* 545 * Decide whether it's text or data by looking 546 * at the entry point. 547 */ 548 if (eh->e_entry >= addr && 549 eh->e_entry < (addr + size)) { 550 epp->ep_taddr = addr; 551 epp->ep_tsize = size; 552 if (epp->ep_daddr == ELFDEFNNAME(NO_ADDR)) { 553 epp->ep_daddr = addr; 554 epp->ep_dsize = size; 555 } 556 } else { 557 epp->ep_daddr = addr; 558 epp->ep_dsize = size; 559 } 560 break; 561 562 case PT_SHLIB: 563 /* SCO has these sections. */ 564 case PT_INTERP: 565 /* Already did this one. */ 566 case PT_DYNAMIC: 567 case PT_NOTE: 568 break; 569 570 case PT_PHDR: 571 /* Note address of program headers (in text segment) */ 572 phdr = pp->p_vaddr; 573 break; 574 575 default: 576 /* 577 * Not fatal; we don't need to understand everything. 578 */ 579 break; 580 } 581 } 582 583 /* this breaks on, e.g., OpenBSD-compatible mips shared binaries. */ 584#ifndef ELF_INTERP_NON_RELOCATABLE 585 /* 586 * If no position to load the interpreter was set by a probe 587 * function, pick the same address that a non-fixed mmap(0, ..) 588 * would (i.e. something safely out of the way). 589 */ 590 if (pos == ELFDEFNNAME(NO_ADDR)) 591 pos = round_page(epp->ep_daddr + MAXDSIZ); 592#endif /* !ELF_INTERP_NON_RELOCATABLE */ 593 594 /* 595 * Check if we found a dynamically linked binary and arrange to load 596 * it's interpreter 597 */ 598 if (interp[0]) { 599 struct elf_args *ap; 600 601 MALLOC(ap, struct elf_args *, sizeof(struct elf_args), 602 M_TEMP, M_WAITOK); 603 if ((error = ELFNAME(load_file)(p, epp, interp, 604 &epp->ep_vmcmds, &epp->ep_entry, ap, &pos)) != 0) { 605 FREE((char *)ap, M_TEMP); 606 goto bad; 607 } 608 pos += phsize; 609 ap->arg_phaddr = phdr; 610 611 ap->arg_phentsize = eh->e_phentsize; 612 ap->arg_phnum = eh->e_phnum; 613 ap->arg_entry = eh->e_entry; 614 615 epp->ep_emul_arg = ap; 616 } else 617 epp->ep_entry = eh->e_entry; 618 619#ifdef ELF_MAP_PAGE_ZERO 620 /* Dell SVR4 maps page zero, yeuch! */ 621 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, PAGE_SIZE, 0, 622 epp->ep_vp, 0, VM_PROT_READ); 623#endif 624 FREE(interp, M_TEMP); 625 free((char *)ph, M_TEMP); 626 vn_marktext(epp->ep_vp); 627 return exec_elf_setup_stack(p, epp); 628 629bad: 630 if (interp) 631 FREE(interp, M_TEMP); 632 free((char *)ph, M_TEMP); 633 kill_vmcmds(&epp->ep_vmcmds); 634 return ENOEXEC; 635} 636 637int 638ELFNAME2(netbsd,signature)(struct proc *p, struct exec_package *epp, 639 Elf_Ehdr *eh) 640{ 641 Elf_Phdr *hph, *ph; 642 Elf_Nhdr *np = NULL; 643 size_t phsize; 644 int error; 645 646 phsize = eh->e_phnum * sizeof(Elf_Phdr); 647 hph = (Elf_Phdr *)malloc(phsize, M_TEMP, M_WAITOK); 648 if ((error = ELFNAME(read_from)(p, epp->ep_vp, eh->e_phoff, 649 (caddr_t)hph, phsize)) != 0) 650 goto out1; 651 652 for (ph = hph; ph < &hph[eh->e_phnum]; ph++) { 653 if (ph->p_type != PT_NOTE || 654 ph->p_filesz < sizeof(Elf_Nhdr) + ELF_NOTE_NETBSD_NAMESZ) 655 continue; 656 657 np = (Elf_Nhdr *)malloc(ph->p_filesz, M_TEMP, M_WAITOK); 658 if ((error = ELFNAME(read_from)(p, epp->ep_vp, ph->p_offset, 659 (caddr_t)np, ph->p_filesz)) != 0) 660 goto out2; 661 662 if (np->n_type != ELF_NOTE_TYPE_OSVERSION) { 663 free(np, M_TEMP); 664 np = NULL; 665 continue; 666 } 667 668 /* Check the name and description sizes. */ 669 if (np->n_namesz != ELF_NOTE_NETBSD_NAMESZ || 670 np->n_descsz != ELF_NOTE_NETBSD_DESCSZ) 671 goto out3; 672 673 /* Is the name "NetBSD\0\0"? */ 674 if (memcmp((np + 1), ELF_NOTE_NETBSD_NAME, 675 ELF_NOTE_NETBSD_NAMESZ)) 676 goto out3; 677 678 /* XXX: We could check for the specific emulation here */ 679 /* All checks succeeded. */ 680 error = 0; 681 goto out2; 682 } 683 684out3: 685 error = ENOEXEC; 686out2: 687 if (np) 688 free(np, M_TEMP); 689out1: 690 free(hph, M_TEMP); 691 return error; 692} 693 694int 695ELFNAME2(netbsd,probe)(struct proc *p, struct exec_package *epp, 696 void *eh, char *itp, vaddr_t *pos) 697{ 698 int error; 699 700 if ((error = ELFNAME2(netbsd,signature)(p, epp, eh)) != 0) 701 return error; 702 *pos = ELFDEFNNAME(NO_ADDR); 703 return 0; 704} 705