exec_elf32.c revision 1.73
1/* $NetBSD: exec_elf32.c,v 1.73 2002/09/12 16:57:44 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#include <sys/cdefs.h> 67__KERNEL_RCSID(1, "$NetBSD: exec_elf32.c,v 1.73 2002/09/12 16:57:44 mycroft Exp $"); 68 69/* If not included by exec_elf64.c, ELFSIZE won't be defined. */ 70#ifndef ELFSIZE 71#define ELFSIZE 32 72#endif 73 74#include <sys/param.h> 75#include <sys/proc.h> 76#include <sys/malloc.h> 77#include <sys/namei.h> 78#include <sys/vnode.h> 79#include <sys/exec.h> 80#include <sys/exec_elf.h> 81#include <sys/syscall.h> 82#include <sys/signalvar.h> 83#include <sys/mount.h> 84#include <sys/stat.h> 85 86#include <machine/cpu.h> 87#include <machine/reg.h> 88 89extern const struct emul emul_netbsd; 90 91int ELFNAME(check_header)(Elf_Ehdr *, int); 92int ELFNAME(load_file)(struct proc *, struct exec_package *, char *, 93 struct exec_vmcmd_set *, u_long *, struct elf_args *, Elf_Addr *); 94void ELFNAME(load_psection)(struct exec_vmcmd_set *, struct vnode *, 95 const Elf_Phdr *, Elf_Addr *, u_long *, int *, int); 96 97int ELFNAME2(netbsd,signature)(struct proc *, struct exec_package *, 98 Elf_Ehdr *); 99int ELFNAME2(netbsd,probe)(struct proc *, struct exec_package *, 100 void *, char *, vaddr_t *); 101 102/* round up and down to page boundaries. */ 103#define ELF_ROUND(a, b) (((a) + (b) - 1) & ~((b) - 1)) 104#define ELF_TRUNC(a, b) ((a) & ~((b) - 1)) 105 106/* 107 * Copy arguments onto the stack in the normal way, but add some 108 * extra information in case of dynamic binding. 109 */ 110int 111ELFNAME(copyargs)(struct proc *p, struct exec_package *pack, 112 struct ps_strings *arginfo, char **stackp, void *argp) 113{ 114 size_t len; 115 AuxInfo ai[ELF_AUX_ENTRIES], *a; 116 struct elf_args *ap; 117 int error; 118 119 if ((error = copyargs(p, pack, arginfo, stackp, argp)) != 0) 120 return error; 121 122 a = ai; 123 124 /* 125 * Push extra arguments on the stack needed by dynamically 126 * linked binaries 127 */ 128 if ((ap = (struct elf_args *)pack->ep_emul_arg)) { 129 130 a->a_type = AT_PHDR; 131 a->a_v = ap->arg_phaddr; 132 a++; 133 134 a->a_type = AT_PHENT; 135 a->a_v = ap->arg_phentsize; 136 a++; 137 138 a->a_type = AT_PHNUM; 139 a->a_v = ap->arg_phnum; 140 a++; 141 142 a->a_type = AT_PAGESZ; 143 a->a_v = PAGE_SIZE; 144 a++; 145 146 a->a_type = AT_BASE; 147 a->a_v = ap->arg_interp; 148 a++; 149 150 a->a_type = AT_FLAGS; 151 a->a_v = 0; 152 a++; 153 154 a->a_type = AT_ENTRY; 155 a->a_v = ap->arg_entry; 156 a++; 157 158 a->a_type = AT_EUID; 159 a->a_v = p->p_ucred->cr_uid; 160 a++; 161 162 a->a_type = AT_RUID; 163 a->a_v = p->p_cred->p_ruid; 164 a++; 165 166 a->a_type = AT_EGID; 167 a->a_v = p->p_ucred->cr_gid; 168 a++; 169 170 a->a_type = AT_RGID; 171 a->a_v = p->p_cred->p_rgid; 172 a++; 173 174 free((char *)ap, M_TEMP); 175 pack->ep_emul_arg = NULL; 176 } 177 178 a->a_type = AT_NULL; 179 a->a_v = 0; 180 a++; 181 182 len = (a - ai) * sizeof(AuxInfo); 183 if ((error = copyout(ai, *stackp, len)) != 0) 184 return error; 185 *stackp += len; 186 187 return 0; 188} 189 190/* 191 * elf_check_header(): 192 * 193 * Check header for validity; return 0 of ok ENOEXEC if error 194 */ 195int 196ELFNAME(check_header)(Elf_Ehdr *eh, int type) 197{ 198 199 if (memcmp(eh->e_ident, ELFMAG, SELFMAG) != 0 || 200 eh->e_ident[EI_CLASS] != ELFCLASS) 201 return (ENOEXEC); 202 203 switch (eh->e_machine) { 204 205 ELFDEFNNAME(MACHDEP_ID_CASES) 206 207 default: 208 return (ENOEXEC); 209 } 210 211 if (ELF_EHDR_FLAGS_OK(eh) == 0) 212 return (ENOEXEC); 213 214 if (eh->e_type != type) 215 return (ENOEXEC); 216 217 if (eh->e_shnum > 512 || 218 eh->e_phnum > 128) 219 return (ENOEXEC); 220 221 return (0); 222} 223 224/* 225 * elf_load_psection(): 226 * 227 * Load a psection at the appropriate address 228 */ 229void 230ELFNAME(load_psection)(struct exec_vmcmd_set *vcset, struct vnode *vp, 231 const Elf_Phdr *ph, Elf_Addr *addr, u_long *size, int *prot, int flags) 232{ 233 u_long uaddr, msize, psize, rm, rf; 234 long diff, offset; 235 236 /* 237 * If the user specified an address, then we load there. 238 */ 239 if (*addr != ELFDEFNNAME(NO_ADDR)) { 240 if (ph->p_align > 1) { 241 *addr = ELF_TRUNC(*addr, ph->p_align); 242 uaddr = ELF_TRUNC(ph->p_vaddr, ph->p_align); 243 } else 244 uaddr = ph->p_vaddr; 245 diff = ph->p_vaddr - uaddr; 246 } else { 247 *addr = uaddr = ph->p_vaddr; 248 if (ph->p_align > 1) 249 *addr = ELF_TRUNC(uaddr, ph->p_align); 250 diff = uaddr - *addr; 251 } 252 253 *prot |= (ph->p_flags & PF_R) ? VM_PROT_READ : 0; 254 *prot |= (ph->p_flags & PF_W) ? VM_PROT_WRITE : 0; 255 *prot |= (ph->p_flags & PF_X) ? VM_PROT_EXECUTE : 0; 256 257 offset = ph->p_offset - diff; 258 *size = ph->p_filesz + diff; 259 msize = ph->p_memsz + diff; 260 261 if (ph->p_align >= PAGE_SIZE) { 262 if ((ph->p_flags & PF_W) != 0) { 263 /* 264 * Because the pagedvn pager can't handle zero fill 265 * of the last data page if it's not page aligned we 266 * map the last page readvn. 267 */ 268 psize = trunc_page(*size); 269 } else { 270 psize = round_page(*size); 271 } 272 } else { 273 psize = *size; 274 } 275 276 if (psize > 0) { 277 NEW_VMCMD2(vcset, ph->p_align < PAGE_SIZE ? 278 vmcmd_map_readvn : vmcmd_map_pagedvn, psize, *addr, vp, 279 offset, *prot, flags); 280 } 281 if (psize < *size) { 282 NEW_VMCMD2(vcset, vmcmd_map_readvn, *size - psize, 283 *addr + psize, vp, offset + psize, *prot, 284 psize > 0 ? flags & VMCMD_RELATIVE : flags); 285 } 286 287 /* 288 * Check if we need to extend the size of the segment 289 */ 290 rm = round_page(*addr + msize); 291 rf = round_page(*addr + *size); 292 293 if (rm != rf) { 294 NEW_VMCMD2(vcset, vmcmd_map_zero, rm - rf, rf, NULLVP, 295 0, *prot, flags & VMCMD_RELATIVE); 296 *size = msize; 297 } 298} 299 300/* 301 * elf_load_file(): 302 * 303 * Load a file (interpreter/library) pointed to by path 304 * [stolen from coff_load_shlib()]. Made slightly generic 305 * so it might be used externally. 306 */ 307int 308ELFNAME(load_file)(struct proc *p, struct exec_package *epp, char *path, 309 struct exec_vmcmd_set *vcset, u_long *entry, struct elf_args *ap, 310 Elf_Addr *last) 311{ 312 int error, i; 313 struct nameidata nd; 314 struct vnode *vp; 315 struct vattr attr; 316 Elf_Ehdr eh; 317 Elf_Phdr *ph = NULL; 318 Elf_Phdr *base_ph = NULL; 319 u_long phsize; 320 char *bp = NULL; 321 Elf_Addr addr = *last; 322 323 bp = path; 324 /* 325 * 1. open file 326 * 2. read filehdr 327 * 3. map text, data, and bss out of it using VM_* 328 */ 329 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, path, p); 330 if ((error = namei(&nd)) != 0) 331 return error; 332 vp = nd.ni_vp; 333 334 /* 335 * Similarly, if it's not marked as executable, or it's not a regular 336 * file, we don't allow it to be used. 337 */ 338 if (vp->v_type != VREG) { 339 error = EACCES; 340 goto badunlock; 341 } 342 if ((error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p)) != 0) 343 goto badunlock; 344 345 /* get attributes */ 346 if ((error = VOP_GETATTR(vp, &attr, p->p_ucred, p)) != 0) 347 goto badunlock; 348 349 /* 350 * Check mount point. Though we're not trying to exec this binary, 351 * we will be executing code from it, so if the mount point 352 * disallows execution or set-id-ness, we punt or kill the set-id. 353 */ 354 if (vp->v_mount->mnt_flag & MNT_NOEXEC) { 355 error = EACCES; 356 goto badunlock; 357 } 358 if (vp->v_mount->mnt_flag & MNT_NOSUID) 359 epp->ep_vap->va_mode &= ~(S_ISUID | S_ISGID); 360 361#ifdef notyet /* XXX cgd 960926 */ 362 XXX cgd 960926: (maybe) VOP_OPEN it (and VOP_CLOSE in copyargs?) 363#endif 364 VOP_UNLOCK(vp, 0); 365 366 if ((error = exec_read_from(p, vp, 0, &eh, sizeof(eh))) != 0) 367 goto bad; 368 369 if ((error = ELFNAME(check_header)(&eh, ET_DYN)) != 0) 370 goto bad; 371 372 phsize = eh.e_phnum * sizeof(Elf_Phdr); 373 ph = (Elf_Phdr *)malloc(phsize, M_TEMP, M_WAITOK); 374 375 if ((error = exec_read_from(p, vp, eh.e_phoff, ph, phsize)) != 0) 376 goto bad; 377 378 /* 379 * Load all the necessary sections 380 */ 381 for (i = 0; i < eh.e_phnum; i++) { 382 u_long size = 0; 383 int prot = 0; 384 int flags; 385 386 switch (ph[i].p_type) { 387 case PT_LOAD: 388 if (base_ph == NULL) { 389 addr = *last; 390 flags = VMCMD_BASE; 391 } else { 392 addr = ph[i].p_vaddr - base_ph->p_vaddr; 393 flags = VMCMD_RELATIVE; 394 } 395 ELFNAME(load_psection)(vcset, vp, &ph[i], &addr, 396 &size, &prot, flags); 397 /* If entry is within this section it must be text */ 398 if (eh.e_entry >= ph[i].p_vaddr && 399 eh.e_entry < (ph[i].p_vaddr + size)) { 400 *entry = addr + eh.e_entry - ph[i].p_vaddr; 401 ap->arg_interp = addr; 402 } 403 if (base_ph == NULL) 404 base_ph = &ph[i]; 405 addr += size; 406 break; 407 408 case PT_DYNAMIC: 409 case PT_PHDR: 410 case PT_NOTE: 411 break; 412 413 default: 414 break; 415 } 416 } 417 418 free((char *)ph, M_TEMP); 419 *last = addr; 420 vrele(vp); 421 return 0; 422 423badunlock: 424 VOP_UNLOCK(vp, 0); 425 426bad: 427 if (ph != NULL) 428 free((char *)ph, M_TEMP); 429#ifdef notyet /* XXX cgd 960926 */ 430 (maybe) VOP_CLOSE it 431#endif 432 vrele(vp); 433 return error; 434} 435 436/* 437 * exec_elf_makecmds(): Prepare an Elf binary's exec package 438 * 439 * First, set of the various offsets/lengths in the exec package. 440 * 441 * Then, mark the text image busy (so it can be demand paged) or error 442 * out if this is not possible. Finally, set up vmcmds for the 443 * text, data, bss, and stack segments. 444 */ 445int 446ELFNAME2(exec,makecmds)(struct proc *p, struct exec_package *epp) 447{ 448 Elf_Ehdr *eh = epp->ep_hdr; 449 Elf_Phdr *ph, *pp; 450 Elf_Addr phdr = 0, pos = 0; 451 int error, i, nload; 452 char *interp = NULL; 453 u_long phsize; 454 455 if (epp->ep_hdrvalid < sizeof(Elf_Ehdr)) 456 return ENOEXEC; 457 458 /* 459 * XXX allow for executing shared objects. It seems silly 460 * but other ELF-based systems allow it as well. 461 */ 462 if (ELFNAME(check_header)(eh, ET_EXEC) != 0 && 463 ELFNAME(check_header)(eh, ET_DYN) != 0) 464 return ENOEXEC; 465 466 /* 467 * check if vnode is in open for writing, because we want to 468 * demand-page out of it. if it is, don't do it, for various 469 * reasons 470 */ 471 if (epp->ep_vp->v_writecount != 0) { 472#ifdef DIAGNOSTIC 473 if (epp->ep_vp->v_flag & VTEXT) 474 panic("exec: a VTEXT vnode has writecount != 0\n"); 475#endif 476 return ETXTBSY; 477 } 478 /* 479 * Allocate space to hold all the program headers, and read them 480 * from the file 481 */ 482 phsize = eh->e_phnum * sizeof(Elf_Phdr); 483 ph = (Elf_Phdr *)malloc(phsize, M_TEMP, M_WAITOK); 484 485 if ((error = exec_read_from(p, epp->ep_vp, eh->e_phoff, ph, phsize)) != 486 0) 487 goto bad; 488 489 epp->ep_taddr = epp->ep_tsize = ELFDEFNNAME(NO_ADDR); 490 epp->ep_daddr = epp->ep_dsize = ELFDEFNNAME(NO_ADDR); 491 492 MALLOC(interp, char *, MAXPATHLEN, M_TEMP, M_WAITOK); 493 interp[0] = '\0'; 494 495 for (i = 0; i < eh->e_phnum; i++) { 496 pp = &ph[i]; 497 if (pp->p_type == PT_INTERP) { 498 if (pp->p_filesz >= MAXPATHLEN) 499 goto bad; 500 if ((error = exec_read_from(p, epp->ep_vp, 501 pp->p_offset, interp, pp->p_filesz)) != 0) 502 goto bad; 503 break; 504 } 505 } 506 507 /* 508 * On the same architecture, we may be emulating different systems. 509 * See which one will accept this executable. This currently only 510 * applies to SVR4, and IBCS2 on the i386 and Linux on the i386 511 * and the Alpha. 512 * 513 * Probe functions would normally see if the interpreter (if any) 514 * exists. Emulation packages may possibly replace the interpreter in 515 * interp[] with a changed path (/emul/xxx/<path>). 516 */ 517 if (!epp->ep_esch->u.elf_probe_func) { 518 pos = ELFDEFNNAME(NO_ADDR); 519 } else { 520 vaddr_t startp = 0; 521 522 error = (*epp->ep_esch->u.elf_probe_func)(p, epp, eh, interp, 523 &startp); 524 pos = (Elf_Addr)startp; 525 if (error) 526 goto bad; 527 } 528 529 /* 530 * Load all the necessary sections 531 */ 532 for (i = nload = 0; i < eh->e_phnum; i++) { 533 Elf_Addr addr = ELFDEFNNAME(NO_ADDR); 534 u_long size = 0; 535 int prot = 0; 536 537 pp = &ph[i]; 538 539 switch (ph[i].p_type) { 540 case PT_LOAD: 541 /* 542 * XXX 543 * Can handle only 2 sections: text and data 544 */ 545 if (nload++ == 2) 546 goto bad; 547 ELFNAME(load_psection)(&epp->ep_vmcmds, epp->ep_vp, 548 &ph[i], &addr, &size, &prot, 0); 549 550 /* 551 * Decide whether it's text or data by looking 552 * at the entry point. 553 */ 554 if (eh->e_entry >= addr && 555 eh->e_entry < (addr + size)) { 556 epp->ep_taddr = addr; 557 epp->ep_tsize = size; 558 if (epp->ep_daddr == ELFDEFNNAME(NO_ADDR)) { 559 epp->ep_daddr = addr; 560 epp->ep_dsize = size; 561 } 562 } else { 563 epp->ep_daddr = addr; 564 epp->ep_dsize = size; 565 } 566 break; 567 568 case PT_SHLIB: 569 /* SCO has these sections. */ 570 case PT_INTERP: 571 /* Already did this one. */ 572 case PT_DYNAMIC: 573 case PT_NOTE: 574 break; 575 576 case PT_PHDR: 577 /* Note address of program headers (in text segment) */ 578 phdr = pp->p_vaddr; 579 break; 580 581 default: 582 /* 583 * Not fatal; we don't need to understand everything. 584 */ 585 break; 586 } 587 } 588 589 /* this breaks on, e.g., OpenBSD-compatible mips shared binaries. */ 590#ifndef ELF_INTERP_NON_RELOCATABLE 591 /* 592 * If no position to load the interpreter was set by a probe 593 * function, pick the same address that a non-fixed mmap(0, ..) 594 * would (i.e. something safely out of the way). 595 */ 596 if (pos == ELFDEFNNAME(NO_ADDR)) 597 pos = round_page(epp->ep_daddr + MAXDSIZ); 598#endif /* !ELF_INTERP_NON_RELOCATABLE */ 599 600 /* 601 * Check if we found a dynamically linked binary and arrange to load 602 * it's interpreter 603 */ 604 if (interp[0]) { 605 struct elf_args *ap; 606 607 MALLOC(ap, struct elf_args *, sizeof(struct elf_args), 608 M_TEMP, M_WAITOK); 609 if ((error = ELFNAME(load_file)(p, epp, interp, 610 &epp->ep_vmcmds, &epp->ep_entry, ap, &pos)) != 0) { 611 FREE((char *)ap, M_TEMP); 612 goto bad; 613 } 614 pos += phsize; 615 ap->arg_phaddr = phdr; 616 617 ap->arg_phentsize = eh->e_phentsize; 618 ap->arg_phnum = eh->e_phnum; 619 ap->arg_entry = eh->e_entry; 620 621 epp->ep_emul_arg = ap; 622 } else 623 epp->ep_entry = eh->e_entry; 624 625#ifdef ELF_MAP_PAGE_ZERO 626 /* Dell SVR4 maps page zero, yeuch! */ 627 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, PAGE_SIZE, 0, 628 epp->ep_vp, 0, VM_PROT_READ); 629#endif 630 FREE(interp, M_TEMP); 631 free((char *)ph, M_TEMP); 632 epp->ep_vp->v_flag |= VTEXT; 633 return exec_elf_setup_stack(p, epp); 634 635bad: 636 if (interp) 637 FREE(interp, M_TEMP); 638 free((char *)ph, M_TEMP); 639 kill_vmcmds(&epp->ep_vmcmds); 640 return ENOEXEC; 641} 642 643int 644ELFNAME2(netbsd,signature)(struct proc *p, struct exec_package *epp, 645 Elf_Ehdr *eh) 646{ 647 size_t i; 648 Elf_Phdr *ph; 649 size_t phsize; 650 int error; 651 652 phsize = eh->e_phnum * sizeof(Elf_Phdr); 653 ph = (Elf_Phdr *)malloc(phsize, M_TEMP, M_WAITOK); 654 error = exec_read_from(p, epp->ep_vp, eh->e_phoff, ph, phsize); 655 if (error) 656 goto out; 657 658 for (i = 0; i < eh->e_phnum; i++) { 659 Elf_Phdr *ephp = &ph[i]; 660 Elf_Nhdr *np; 661 662 if (ephp->p_type != PT_NOTE || 663 ephp->p_filesz > 1024 || 664 ephp->p_filesz < sizeof(Elf_Nhdr) + ELF_NOTE_NETBSD_NAMESZ) 665 continue; 666 667 np = (Elf_Nhdr *)malloc(ephp->p_filesz, M_TEMP, M_WAITOK); 668 error = exec_read_from(p, epp->ep_vp, ephp->p_offset, np, 669 ephp->p_filesz); 670 if (error) 671 goto next; 672 673 if (np->n_type != ELF_NOTE_TYPE_NETBSD_TAG || 674 np->n_namesz != ELF_NOTE_NETBSD_NAMESZ || 675 np->n_descsz != ELF_NOTE_NETBSD_DESCSZ || 676 memcmp((caddr_t)(np + 1), ELF_NOTE_NETBSD_NAME, 677 ELF_NOTE_NETBSD_NAMESZ)) 678 goto next; 679 680 error = 0; 681 free(np, M_TEMP); 682 goto out; 683 684 next: 685 free(np, M_TEMP); 686 continue; 687 } 688 689 error = ENOEXEC; 690out: 691 free(ph, M_TEMP); 692 return (error); 693} 694 695int 696ELFNAME2(netbsd,probe)(struct proc *p, struct exec_package *epp, 697 void *eh, char *itp, vaddr_t *pos) 698{ 699 int error; 700 701 if ((error = ELFNAME2(netbsd,signature)(p, epp, eh)) != 0) 702 return error; 703 *pos = ELFDEFNNAME(NO_ADDR); 704 return 0; 705} 706