1 /* $NetBSD: exec_elf32.c,v 1.101 2005/02/26 21:34:55 perry 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 1.101 2005/02/26 21:34:55 perry 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 89 extern const struct emul emul_netbsd; 90 91 int ELFNAME(load_file)(struct proc *, struct exec_package *, char *, 92 struct exec_vmcmd_set *, u_long *, struct elf_args *, Elf_Addr *); 93 void ELFNAME(load_psection)(struct exec_vmcmd_set *, struct vnode *, 94 const Elf_Phdr *, Elf_Addr *, u_long *, int *, int); 95 96 int ELFNAME2(netbsd,signature)(struct proc *, struct exec_package *, 97 Elf_Ehdr *); 98 int ELFNAME2(netbsd,probe)(struct proc *, struct exec_package *, 99 void *, char *, vaddr_t *); 100 101 /* round up and down to page boundaries. */ 102 #define ELF_ROUND(a, b) (((a) + (b) - 1) & ~((b) - 1)) 103 #define ELF_TRUNC(a, b) ((a) & ~((b) - 1)) 104 105 #define MAXPHNUM 50 106 107 /* 108 * Copy arguments onto the stack in the normal way, but add some 109 * extra information in case of dynamic binding. 110 */ 111 int 112 ELFNAME(copyargs)(struct proc *p, struct exec_package *pack, 113 struct ps_strings *arginfo, char **stackp, void *argp) 114 { 115 size_t len; 116 AuxInfo ai[ELF_AUX_ENTRIES], *a; 117 struct elf_args *ap; 118 int error; 119 120 if ((error = copyargs(p, pack, arginfo, stackp, argp)) != 0) 121 return error; 122 123 a = ai; 124 125 /* 126 * Push extra arguments on the stack needed by dynamically 127 * linked binaries 128 */ 129 if ((ap = (struct elf_args *)pack->ep_emul_arg)) { 130 struct vattr *vap = pack->ep_vap; 131 132 a->a_type = AT_PHDR; 133 a->a_v = ap->arg_phaddr; 134 a++; 135 136 a->a_type = AT_PHENT; 137 a->a_v = ap->arg_phentsize; 138 a++; 139 140 a->a_type = AT_PHNUM; 141 a->a_v = ap->arg_phnum; 142 a++; 143 144 a->a_type = AT_PAGESZ; 145 a->a_v = PAGE_SIZE; 146 a++; 147 148 a->a_type = AT_BASE; 149 a->a_v = ap->arg_interp; 150 a++; 151 152 a->a_type = AT_FLAGS; 153 a->a_v = 0; 154 a++; 155 156 a->a_type = AT_ENTRY; 157 a->a_v = ap->arg_entry; 158 a++; 159 160 a->a_type = AT_EUID; 161 if (vap->va_mode & S_ISUID) 162 a->a_v = vap->va_uid; 163 else 164 a->a_v = p->p_ucred->cr_uid; 165 a++; 166 167 a->a_type = AT_RUID; 168 a->a_v = p->p_cred->p_ruid; 169 a++; 170 171 a->a_type = AT_EGID; 172 if (vap->va_mode & S_ISGID) 173 a->a_v = vap->va_gid; 174 else 175 a->a_v = p->p_ucred->cr_gid; 176 a++; 177 178 a->a_type = AT_RGID; 179 a->a_v = p->p_cred->p_rgid; 180 a++; 181 182 free(ap, M_TEMP); 183 pack->ep_emul_arg = NULL; 184 } 185 186 a->a_type = AT_NULL; 187 a->a_v = 0; 188 a++; 189 190 len = (a - ai) * sizeof(AuxInfo); 191 if ((error = copyout(ai, *stackp, len)) != 0) 192 return error; 193 *stackp += len; 194 195 return 0; 196 } 197 198 /* 199 * elf_check_header(): 200 * 201 * Check header for validity; return 0 of ok ENOEXEC if error 202 */ 203 int 204 ELFNAME(check_header)(Elf_Ehdr *eh, int type) 205 { 206 207 if (memcmp(eh->e_ident, ELFMAG, SELFMAG) != 0 || 208 eh->e_ident[EI_CLASS] != ELFCLASS) 209 return (ENOEXEC); 210 211 switch (eh->e_machine) { 212 213 ELFDEFNNAME(MACHDEP_ID_CASES) 214 215 default: 216 return (ENOEXEC); 217 } 218 219 if (ELF_EHDR_FLAGS_OK(eh) == 0) 220 return (ENOEXEC); 221 222 if (eh->e_type != type) 223 return (ENOEXEC); 224 225 if (eh->e_shnum > 32768 || eh->e_phnum > 128) 226 return (ENOEXEC); 227 228 return (0); 229 } 230 231 /* 232 * elf_load_psection(): 233 * 234 * Load a psection at the appropriate address 235 */ 236 void 237 ELFNAME(load_psection)(struct exec_vmcmd_set *vcset, struct vnode *vp, 238 const Elf_Phdr *ph, Elf_Addr *addr, u_long *size, int *prot, int flags) 239 { 240 u_long msize, psize, rm, rf; 241 long diff, offset; 242 243 /* 244 * If the user specified an address, then we load there. 245 */ 246 if (*addr == ELFDEFNNAME(NO_ADDR)) 247 *addr = ph->p_vaddr; 248 249 if (ph->p_align > 1) { 250 /* 251 * Make sure we are virtually aligned as we are supposed to be. 252 */ 253 diff = ph->p_vaddr - ELF_TRUNC(ph->p_vaddr, ph->p_align); 254 KASSERT(*addr - diff == ELF_TRUNC(*addr, ph->p_align)); 255 /* 256 * But make sure to not map any pages before the start of the 257 * psection by limiting the difference to within a page. 258 */ 259 diff &= PAGE_MASK; 260 } else 261 diff = 0; 262 263 *prot |= (ph->p_flags & PF_R) ? VM_PROT_READ : 0; 264 *prot |= (ph->p_flags & PF_W) ? VM_PROT_WRITE : 0; 265 *prot |= (ph->p_flags & PF_X) ? VM_PROT_EXECUTE : 0; 266 267 /* 268 * Adjust everything so it all starts on a page boundary. 269 */ 270 *addr -= diff; 271 offset = ph->p_offset - diff; 272 *size = ph->p_filesz + diff; 273 msize = ph->p_memsz + diff; 274 275 if (ph->p_align >= PAGE_SIZE) { 276 if ((ph->p_flags & PF_W) != 0) { 277 /* 278 * Because the pagedvn pager can't handle zero fill 279 * of the last data page if it's not page aligned we 280 * map the last page readvn. 281 */ 282 psize = trunc_page(*size); 283 } else { 284 psize = round_page(*size); 285 } 286 } else { 287 psize = *size; 288 } 289 290 if (psize > 0) { 291 NEW_VMCMD2(vcset, ph->p_align < PAGE_SIZE ? 292 vmcmd_map_readvn : vmcmd_map_pagedvn, psize, *addr, vp, 293 offset, *prot, flags); 294 flags &= VMCMD_RELATIVE; 295 } 296 if (psize < *size) { 297 NEW_VMCMD2(vcset, vmcmd_map_readvn, *size - psize, 298 *addr + psize, vp, offset + psize, *prot, flags); 299 } 300 301 /* 302 * Check if we need to extend the size of the segment (does 303 * bss extend page the next page boundary)? 304 */ 305 rm = round_page(*addr + msize); 306 rf = round_page(*addr + *size); 307 308 if (rm != rf) { 309 NEW_VMCMD2(vcset, vmcmd_map_zero, rm - rf, rf, NULLVP, 310 0, *prot, flags & VMCMD_RELATIVE); 311 *size = msize; 312 } 313 } 314 315 /* 316 * elf_load_file(): 317 * 318 * Load a file (interpreter/library) pointed to by path 319 * [stolen from coff_load_shlib()]. Made slightly generic 320 * so it might be used externally. 321 */ 322 int 323 ELFNAME(load_file)(struct proc *p, struct exec_package *epp, char *path, 324 struct exec_vmcmd_set *vcset, u_long *entryoff, struct elf_args *ap, 325 Elf_Addr *last) 326 { 327 int error, i; 328 struct nameidata nd; 329 struct vnode *vp; 330 struct vattr attr; 331 Elf_Ehdr eh; 332 Elf_Phdr *ph = NULL; 333 const Elf_Phdr *ph0; 334 const Elf_Phdr *base_ph; 335 const Elf_Phdr *last_ph; 336 u_long phsize; 337 Elf_Addr addr = *last; 338 339 /* 340 * 1. open file 341 * 2. read filehdr 342 * 3. map text, data, and bss out of it using VM_* 343 */ 344 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, path, p); 345 if ((error = namei(&nd)) != 0) 346 return error; 347 vp = nd.ni_vp; 348 349 /* 350 * Similarly, if it's not marked as executable, or it's not a regular 351 * file, we don't allow it to be used. 352 */ 353 if (vp->v_type != VREG) { 354 error = EACCES; 355 goto badunlock; 356 } 357 if ((error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p)) != 0) 358 goto badunlock; 359 360 /* get attributes */ 361 if ((error = VOP_GETATTR(vp, &attr, p->p_ucred, p)) != 0) 362 goto badunlock; 363 364 /* 365 * Check mount point. Though we're not trying to exec this binary, 366 * we will be executing code from it, so if the mount point 367 * disallows execution or set-id-ness, we punt or kill the set-id. 368 */ 369 if (vp->v_mount->mnt_flag & MNT_NOEXEC) { 370 error = EACCES; 371 goto badunlock; 372 } 373 if (vp->v_mount->mnt_flag & MNT_NOSUID) 374 epp->ep_vap->va_mode &= ~(S_ISUID | S_ISGID); 375 376 #ifdef notyet /* XXX cgd 960926 */ 377 XXX cgd 960926: (maybe) VOP_OPEN it (and VOP_CLOSE in copyargs?) 378 #endif 379 380 error = vn_marktext(vp); 381 if (error) 382 goto badunlock; 383 384 VOP_UNLOCK(vp, 0); 385 386 if ((error = exec_read_from(p, vp, 0, &eh, sizeof(eh))) != 0) 387 goto bad; 388 389 if ((error = ELFNAME(check_header)(&eh, ET_DYN)) != 0) 390 goto bad; 391 392 if (eh.e_phnum > MAXPHNUM) 393 goto bad; 394 395 phsize = eh.e_phnum * sizeof(Elf_Phdr); 396 ph = (Elf_Phdr *)malloc(phsize, M_TEMP, M_WAITOK); 397 398 if ((error = exec_read_from(p, vp, eh.e_phoff, ph, phsize)) != 0) 399 goto bad; 400 401 /* 402 * If no position to load the interpreter was set by a probe 403 * function, pick the same address that a non-fixed mmap(0, ..) 404 * would (i.e. something safely out of the way). 405 */ 406 if (*last == ELFDEFNNAME(NO_ADDR)) { 407 u_long limit = 0; 408 /* 409 * Find the start and ending addresses of the psections to 410 * be loaded. This will give us the size. 411 */ 412 for (i = 0, ph0 = ph, base_ph = NULL; i < eh.e_phnum; 413 i++, ph0++) { 414 if (ph0->p_type == PT_LOAD) { 415 u_long psize = ph0->p_vaddr + ph0->p_memsz; 416 if (base_ph == NULL) 417 base_ph = ph0; 418 if (psize > limit) 419 limit = psize; 420 } 421 } 422 423 /* 424 * Now compute the size and load address. 425 */ 426 addr = VM_DEFAULT_ADDRESS(epp->ep_daddr, 427 round_page(limit) - trunc_page(base_ph->p_vaddr)); 428 } else 429 addr = *last; /* may be ELF_LINK_ADDR */ 430 431 /* 432 * Load all the necessary sections 433 */ 434 for (i = 0, ph0 = ph, base_ph = NULL, last_ph = NULL; 435 i < eh.e_phnum; i++, ph0++) { 436 switch (ph0->p_type) { 437 case PT_LOAD: { 438 u_long size; 439 int prot = 0; 440 int flags; 441 442 if (base_ph == NULL) { 443 /* 444 * First encountered psection is always the 445 * base psection. Make sure it's aligned 446 * properly (align down for topdown and align 447 * upwards for not topdown). 448 */ 449 base_ph = ph0; 450 flags = VMCMD_BASE; 451 if (addr == ELF_LINK_ADDR) 452 addr = ph0->p_vaddr; 453 if (p->p_vmspace->vm_map.flags & VM_MAP_TOPDOWN) 454 addr = ELF_TRUNC(addr, ph0->p_align); 455 else 456 addr = ELF_ROUND(addr, ph0->p_align); 457 } else { 458 u_long limit = round_page(last_ph->p_vaddr 459 + last_ph->p_memsz); 460 u_long base = trunc_page(ph0->p_vaddr); 461 462 /* 463 * If there is a gap in between the psections, 464 * map it as inaccessible so nothing else 465 * mmap'ed will be placed there. 466 */ 467 if (limit != base) { 468 NEW_VMCMD2(vcset, vmcmd_map_zero, 469 base - limit, 470 limit - base_ph->p_vaddr, NULLVP, 471 0, VM_PROT_NONE, VMCMD_RELATIVE); 472 } 473 474 addr = ph0->p_vaddr - base_ph->p_vaddr; 475 flags = VMCMD_RELATIVE; 476 } 477 last_ph = ph0; 478 ELFNAME(load_psection)(vcset, vp, &ph[i], &addr, 479 &size, &prot, flags); 480 /* 481 * If entry is within this psection then this 482 * must contain the .text section. *entryoff is 483 * relative to the base psection. 484 */ 485 if (eh.e_entry >= ph0->p_vaddr && 486 eh.e_entry < (ph0->p_vaddr + size)) { 487 *entryoff = eh.e_entry - base_ph->p_vaddr; 488 } 489 addr += size; 490 break; 491 } 492 493 case PT_DYNAMIC: 494 case PT_PHDR: 495 case PT_NOTE: 496 break; 497 498 default: 499 break; 500 } 501 } 502 503 free(ph, M_TEMP); 504 /* 505 * This value is ignored if TOPDOWN. 506 */ 507 *last = addr; 508 vrele(vp); 509 return 0; 510 511 badunlock: 512 VOP_UNLOCK(vp, 0); 513 514 bad: 515 if (ph != NULL) 516 free(ph, M_TEMP); 517 #ifdef notyet /* XXX cgd 960926 */ 518 (maybe) VOP_CLOSE it 519 #endif 520 vrele(vp); 521 return error; 522 } 523 524 /* 525 * exec_elf_makecmds(): Prepare an Elf binary's exec package 526 * 527 * First, set of the various offsets/lengths in the exec package. 528 * 529 * Then, mark the text image busy (so it can be demand paged) or error 530 * out if this is not possible. Finally, set up vmcmds for the 531 * text, data, bss, and stack segments. 532 */ 533 int 534 ELFNAME2(exec,makecmds)(struct proc *p, struct exec_package *epp) 535 { 536 Elf_Ehdr *eh = epp->ep_hdr; 537 Elf_Phdr *ph, *pp; 538 Elf_Addr phdr = 0, pos = 0; 539 int error, i, nload; 540 char *interp = NULL; 541 u_long phsize; 542 543 if (epp->ep_hdrvalid < sizeof(Elf_Ehdr)) 544 return ENOEXEC; 545 546 /* 547 * XXX allow for executing shared objects. It seems silly 548 * but other ELF-based systems allow it as well. 549 */ 550 if (ELFNAME(check_header)(eh, ET_EXEC) != 0 && 551 ELFNAME(check_header)(eh, ET_DYN) != 0) 552 return ENOEXEC; 553 554 if (eh->e_phnum > MAXPHNUM) 555 return ENOEXEC; 556 557 error = vn_marktext(epp->ep_vp); 558 if (error) 559 return (error); 560 561 /* 562 * Allocate space to hold all the program headers, and read them 563 * from the file 564 */ 565 phsize = eh->e_phnum * sizeof(Elf_Phdr); 566 ph = (Elf_Phdr *)malloc(phsize, M_TEMP, M_WAITOK); 567 568 if ((error = exec_read_from(p, epp->ep_vp, eh->e_phoff, ph, phsize)) != 569 0) 570 goto bad; 571 572 epp->ep_taddr = epp->ep_tsize = ELFDEFNNAME(NO_ADDR); 573 epp->ep_daddr = epp->ep_dsize = ELFDEFNNAME(NO_ADDR); 574 575 for (i = 0; i < eh->e_phnum; i++) { 576 pp = &ph[i]; 577 if (pp->p_type == PT_INTERP) { 578 if (pp->p_filesz >= MAXPATHLEN) 579 goto bad; 580 MALLOC(interp, char *, MAXPATHLEN, M_TEMP, M_WAITOK); 581 interp[0] = '\0'; 582 if ((error = exec_read_from(p, epp->ep_vp, 583 pp->p_offset, interp, pp->p_filesz)) != 0) 584 goto bad; 585 break; 586 } 587 } 588 589 /* 590 * On the same architecture, we may be emulating different systems. 591 * See which one will accept this executable. 592 * 593 * Probe functions would normally see if the interpreter (if any) 594 * exists. Emulation packages may possibly replace the interpreter in 595 * interp[] with a changed path (/emul/xxx/<path>). 596 */ 597 pos = ELFDEFNNAME(NO_ADDR); 598 if (epp->ep_esch->u.elf_probe_func) { 599 vaddr_t startp = (vaddr_t)pos; 600 601 error = (*epp->ep_esch->u.elf_probe_func)(p, epp, eh, interp, 602 &startp); 603 if (error) 604 goto bad; 605 pos = (Elf_Addr)startp; 606 } 607 608 /* 609 * Load all the necessary sections 610 */ 611 for (i = nload = 0; i < eh->e_phnum; i++) { 612 Elf_Addr addr = ELFDEFNNAME(NO_ADDR); 613 u_long size = 0; 614 int prot = 0; 615 616 pp = &ph[i]; 617 618 switch (ph[i].p_type) { 619 case PT_LOAD: 620 /* 621 * XXX 622 * Can handle only 2 sections: text and data 623 */ 624 if (nload++ == 2) 625 goto bad; 626 ELFNAME(load_psection)(&epp->ep_vmcmds, epp->ep_vp, 627 &ph[i], &addr, &size, &prot, VMCMD_FIXED); 628 629 /* 630 * Decide whether it's text or data by looking 631 * at the entry point. 632 */ 633 if (eh->e_entry >= addr && 634 eh->e_entry < (addr + size)) { 635 epp->ep_taddr = addr; 636 epp->ep_tsize = size; 637 if (epp->ep_daddr == ELFDEFNNAME(NO_ADDR)) { 638 epp->ep_daddr = addr; 639 epp->ep_dsize = size; 640 } 641 } else { 642 epp->ep_daddr = addr; 643 epp->ep_dsize = size; 644 } 645 break; 646 647 case PT_SHLIB: 648 /* SCO has these sections. */ 649 case PT_INTERP: 650 /* Already did this one. */ 651 case PT_DYNAMIC: 652 case PT_NOTE: 653 break; 654 655 case PT_PHDR: 656 /* Note address of program headers (in text segment) */ 657 phdr = pp->p_vaddr; 658 break; 659 660 default: 661 /* 662 * Not fatal; we don't need to understand everything. 663 */ 664 break; 665 } 666 } 667 668 /* 669 * Check if we found a dynamically linked binary and arrange to load 670 * its interpreter 671 */ 672 if (interp) { 673 struct elf_args *ap; 674 int i = epp->ep_vmcmds.evs_used; 675 u_long interp_offset; 676 677 MALLOC(ap, struct elf_args *, sizeof(struct elf_args), 678 M_TEMP, M_WAITOK); 679 if ((error = ELFNAME(load_file)(p, epp, interp, 680 &epp->ep_vmcmds, &interp_offset, ap, &pos)) != 0) { 681 FREE(ap, M_TEMP); 682 goto bad; 683 } 684 ap->arg_interp = epp->ep_vmcmds.evs_cmds[i].ev_addr; 685 epp->ep_entry = ap->arg_interp + interp_offset; 686 ap->arg_phaddr = phdr; 687 688 ap->arg_phentsize = eh->e_phentsize; 689 ap->arg_phnum = eh->e_phnum; 690 ap->arg_entry = eh->e_entry; 691 692 epp->ep_emul_arg = ap; 693 694 FREE(interp, M_TEMP); 695 } else 696 epp->ep_entry = eh->e_entry; 697 698 #ifdef ELF_MAP_PAGE_ZERO 699 /* Dell SVR4 maps page zero, yeuch! */ 700 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, PAGE_SIZE, 0, 701 epp->ep_vp, 0, VM_PROT_READ); 702 #endif 703 free(ph, M_TEMP); 704 return (*epp->ep_esch->es_setup_stack)(p, epp); 705 706 bad: 707 if (interp) 708 FREE(interp, M_TEMP); 709 free(ph, M_TEMP); 710 kill_vmcmds(&epp->ep_vmcmds); 711 return ENOEXEC; 712 } 713 714 int 715 ELFNAME2(netbsd,signature)(struct proc *p, struct exec_package *epp, 716 Elf_Ehdr *eh) 717 { 718 size_t i; 719 Elf_Phdr *ph; 720 size_t phsize; 721 int error; 722 723 if (eh->e_phnum > MAXPHNUM) 724 return ENOEXEC; 725 726 phsize = eh->e_phnum * sizeof(Elf_Phdr); 727 ph = (Elf_Phdr *)malloc(phsize, M_TEMP, M_WAITOK); 728 error = exec_read_from(p, epp->ep_vp, eh->e_phoff, ph, phsize); 729 if (error) 730 goto out; 731 732 for (i = 0; i < eh->e_phnum; i++) { 733 Elf_Phdr *ephp = &ph[i]; 734 Elf_Nhdr *np; 735 736 if (ephp->p_type != PT_NOTE || 737 ephp->p_filesz > 1024 || 738 ephp->p_filesz < sizeof(Elf_Nhdr) + ELF_NOTE_NETBSD_NAMESZ) 739 continue; 740 741 np = (Elf_Nhdr *)malloc(ephp->p_filesz, M_TEMP, M_WAITOK); 742 error = exec_read_from(p, epp->ep_vp, ephp->p_offset, np, 743 ephp->p_filesz); 744 if (error) 745 goto next; 746 747 if (np->n_type != ELF_NOTE_TYPE_NETBSD_TAG || 748 np->n_namesz != ELF_NOTE_NETBSD_NAMESZ || 749 np->n_descsz != ELF_NOTE_NETBSD_DESCSZ || 750 memcmp((caddr_t)(np + 1), ELF_NOTE_NETBSD_NAME, 751 ELF_NOTE_NETBSD_NAMESZ)) 752 goto next; 753 754 error = 0; 755 free(np, M_TEMP); 756 goto out; 757 758 next: 759 free(np, M_TEMP); 760 continue; 761 } 762 763 error = ENOEXEC; 764 out: 765 free(ph, M_TEMP); 766 return (error); 767 } 768 769 int 770 ELFNAME2(netbsd,probe)(struct proc *p, struct exec_package *epp, 771 void *eh, char *itp, vaddr_t *pos) 772 { 773 int error; 774 775 if ((error = ELFNAME2(netbsd,signature)(p, epp, eh)) != 0) 776 return error; 777 #ifdef ELF_INTERP_NON_RELOCATABLE 778 *pos = ELF_LINK_ADDR; 779 #endif 780 return 0; 781 } 782