1 /* $NetBSD: exec_elf32.c,v 1.53 2000/07/13 02:35:25 matt Exp $ */ 2 3 /*- 4 * Copyright (c) 1994 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 "opt_compat_linux.h" 72 #include "opt_compat_ibcs2.h" 73 #include "opt_compat_svr4.h" 74 #include "opt_compat_freebsd.h" 75 #include "opt_compat_netbsd32.h" 76 #include "opt_syscall_debug.h" 77 78 #include <sys/param.h> 79 #include <sys/systm.h> 80 #include <sys/kernel.h> 81 #include <sys/proc.h> 82 #include <sys/malloc.h> 83 #include <sys/namei.h> 84 #include <sys/vnode.h> 85 #include <sys/exec.h> 86 #include <sys/exec_elf.h> 87 #include <sys/fcntl.h> 88 #include <sys/syscall.h> 89 #include <sys/signalvar.h> 90 #include <sys/mount.h> 91 #include <sys/stat.h> 92 93 #include <sys/mman.h> 94 95 #include <machine/cpu.h> 96 #include <machine/reg.h> 97 98 #ifdef COMPAT_NETBSD32 99 #include <compat/netbsd32/netbsd32_exec.h> 100 #endif 101 102 #ifdef COMPAT_LINUX 103 #include <compat/linux/common/linux_exec.h> 104 #endif 105 106 #ifdef COMPAT_SVR4 107 #include <compat/svr4/svr4_exec.h> 108 #endif 109 110 #ifdef COMPAT_IBCS2 111 #include <compat/ibcs2/ibcs2_exec.h> 112 #endif 113 114 #ifdef COMPAT_FREEBSD 115 #include <compat/freebsd/freebsd_exec.h> 116 #endif 117 118 int ELFNAME(check_header) __P((Elf_Ehdr *, int)); 119 int ELFNAME(load_file) __P((struct proc *, struct exec_package *, char *, 120 struct exec_vmcmd_set *, u_long *, struct elf_args *, Elf_Addr *)); 121 void ELFNAME(load_psection) __P((struct exec_vmcmd_set *, struct vnode *, 122 const Elf_Phdr *, Elf_Addr *, u_long *, int *, int)); 123 124 int ELFNAME2(netbsd,signature) __P((struct proc *, struct exec_package *, 125 Elf_Ehdr *)); 126 static int ELFNAME2(netbsd,probe) __P((struct proc *, struct exec_package *, 127 Elf_Ehdr *, char *, Elf_Addr *)); 128 129 extern char sigcode[], esigcode[]; 130 #ifdef SYSCALL_DEBUG 131 extern char *syscallnames[]; 132 #endif 133 134 struct emul ELFNAMEEND(emul_netbsd) = { 135 "netbsd", 136 NULL, 137 sendsig, 138 SYS_syscall, 139 SYS_MAXSYSCALL, 140 sysent, 141 #ifdef SYSCALL_DEBUG 142 syscallnames, 143 #else 144 NULL, 145 #endif 146 howmany(ELF_AUX_ENTRIES * sizeof(AuxInfo), sizeof (Elf_Addr)), 147 ELFNAME(copyargs), 148 setregs, 149 sigcode, 150 esigcode, 151 }; 152 153 int (*ELFNAME(probe_funcs)[]) __P((struct proc *, struct exec_package *, 154 Elf_Ehdr *, char *, Elf_Addr *)) = { 155 #if defined(COMPAT_NETBSD32) && (ELFSIZE == 32) 156 /* This one should go first so it matches instead of netbsd */ 157 ELFNAME2(netbsd32,probe), 158 #endif 159 ELFNAME2(netbsd,probe), 160 #if defined(COMPAT_FREEBSD) && (ELFSIZE == 32) 161 ELFNAME2(freebsd,probe), /* XXX not 64-bit safe */ 162 #endif 163 #if defined(COMPAT_LINUX) 164 ELFNAME2(linux,probe), 165 #endif 166 #if defined(COMPAT_SVR4) && (ELFSIZE == 32) 167 ELFNAME2(svr4,probe), /* XXX not 64-bit safe */ 168 #endif 169 #if defined(COMPAT_IBCS2) && (ELFSIZE == 32) 170 ELFNAME2(ibcs2,probe), /* XXX not 64-bit safe */ 171 #endif 172 }; 173 174 /* round up and down to page boundaries. */ 175 #define ELF_ROUND(a, b) (((a) + (b) - 1) & ~((b) - 1)) 176 #define ELF_TRUNC(a, b) ((a) & ~((b) - 1)) 177 178 /* 179 * Copy arguments onto the stack in the normal way, but add some 180 * extra information in case of dynamic binding. 181 */ 182 void * 183 ELFNAME(copyargs)(pack, arginfo, stack, argp) 184 struct exec_package *pack; 185 struct ps_strings *arginfo; 186 void *stack; 187 void *argp; 188 { 189 size_t len; 190 AuxInfo ai[ELF_AUX_ENTRIES], *a; 191 struct elf_args *ap; 192 193 stack = copyargs(pack, arginfo, stack, argp); 194 if (!stack) 195 return NULL; 196 197 a = ai; 198 199 /* 200 * Push extra arguments on the stack needed by dynamically 201 * linked binaries 202 */ 203 if ((ap = (struct elf_args *)pack->ep_emul_arg)) { 204 205 a->a_type = AT_PHDR; 206 a->a_v = ap->arg_phaddr; 207 a++; 208 209 a->a_type = AT_PHENT; 210 a->a_v = ap->arg_phentsize; 211 a++; 212 213 a->a_type = AT_PHNUM; 214 a->a_v = ap->arg_phnum; 215 a++; 216 217 a->a_type = AT_PAGESZ; 218 a->a_v = NBPG; 219 a++; 220 221 a->a_type = AT_BASE; 222 a->a_v = ap->arg_interp; 223 a++; 224 225 a->a_type = AT_FLAGS; 226 a->a_v = 0; 227 a++; 228 229 a->a_type = AT_ENTRY; 230 a->a_v = ap->arg_entry; 231 a++; 232 233 free((char *)ap, M_TEMP); 234 pack->ep_emul_arg = NULL; 235 } 236 237 a->a_type = AT_NULL; 238 a->a_v = 0; 239 a++; 240 241 len = (a - ai) * sizeof(AuxInfo); 242 if (copyout(ai, stack, len)) 243 return NULL; 244 stack = (caddr_t)stack + len; 245 246 return stack; 247 } 248 249 /* 250 * elf_check_header(): 251 * 252 * Check header for validity; return 0 of ok ENOEXEC if error 253 */ 254 int 255 ELFNAME(check_header)(eh, type) 256 Elf_Ehdr *eh; 257 int type; 258 { 259 260 if (memcmp(eh->e_ident, ELFMAG, SELFMAG) != 0 || 261 eh->e_ident[EI_CLASS] != ELFCLASS) 262 return ENOEXEC; 263 264 switch (eh->e_machine) { 265 266 ELFDEFNNAME(MACHDEP_ID_CASES) 267 268 default: 269 return ENOEXEC; 270 } 271 272 if (eh->e_type != type) 273 return ENOEXEC; 274 275 return 0; 276 } 277 278 /* 279 * elf_load_psection(): 280 * 281 * Load a psection at the appropriate address 282 */ 283 void 284 ELFNAME(load_psection)(vcset, vp, ph, addr, size, prot, flags) 285 struct exec_vmcmd_set *vcset; 286 struct vnode *vp; 287 const Elf_Phdr *ph; 288 Elf_Addr *addr; 289 u_long *size; 290 int *prot; 291 int flags; 292 { 293 u_long uaddr, msize, psize, rm, rf; 294 long diff, offset; 295 296 /* 297 * If the user specified an address, then we load there. 298 */ 299 if (*addr != ELFDEFNNAME(NO_ADDR)) { 300 if (ph->p_align > 1) { 301 *addr = ELF_TRUNC(*addr, ph->p_align); 302 uaddr = ELF_TRUNC(ph->p_vaddr, ph->p_align); 303 } else 304 uaddr = ph->p_vaddr; 305 diff = ph->p_vaddr - uaddr; 306 } else { 307 *addr = uaddr = ph->p_vaddr; 308 if (ph->p_align > 1) 309 *addr = ELF_TRUNC(uaddr, ph->p_align); 310 diff = uaddr - *addr; 311 } 312 313 *prot |= (ph->p_flags & PF_R) ? VM_PROT_READ : 0; 314 *prot |= (ph->p_flags & PF_W) ? VM_PROT_WRITE : 0; 315 *prot |= (ph->p_flags & PF_X) ? VM_PROT_EXECUTE : 0; 316 317 offset = ph->p_offset - diff; 318 *size = ph->p_filesz + diff; 319 msize = ph->p_memsz + diff; 320 psize = round_page(*size); 321 322 if ((ph->p_flags & PF_W) != 0) { 323 /* 324 * Because the pagedvn pager can't handle zero fill of the last 325 * data page if it's not page aligned we map the last page 326 * readvn. 327 */ 328 psize = trunc_page(*size); 329 } 330 if (psize > 0) { 331 NEW_VMCMD2(vcset, vmcmd_map_pagedvn, psize, *addr, vp, 332 offset, *prot, flags); 333 } 334 if (psize < *size) { 335 NEW_VMCMD2(vcset, vmcmd_map_readvn, *size - psize, 336 *addr + psize, vp, offset + psize, *prot, 337 psize > 0 ? flags & VMCMD_RELATIVE : flags); 338 } 339 340 /* 341 * Check if we need to extend the size of the segment 342 */ 343 rm = round_page(*addr + msize); 344 rf = round_page(*addr + *size); 345 346 if (rm != rf) { 347 NEW_VMCMD2(vcset, vmcmd_map_zero, rm - rf, rf, NULLVP, 348 0, *prot, flags & VMCMD_RELATIVE); 349 *size = msize; 350 } 351 } 352 353 /* 354 * elf_read_from(): 355 * 356 * Read from vnode into buffer at offset. 357 */ 358 int 359 ELFNAME(read_from)(p, vp, off, buf, size) 360 struct vnode *vp; 361 u_long off; 362 struct proc *p; 363 caddr_t buf; 364 int size; 365 { 366 int error; 367 size_t resid; 368 369 if ((error = vn_rdwr(UIO_READ, vp, buf, size, off, UIO_SYSSPACE, 370 0, p->p_ucred, &resid, p)) != 0) 371 return error; 372 /* 373 * See if we got all of it 374 */ 375 if (resid != 0) 376 return ENOEXEC; 377 return 0; 378 } 379 380 /* 381 * elf_load_file(): 382 * 383 * Load a file (interpreter/library) pointed to by path 384 * [stolen from coff_load_shlib()]. Made slightly generic 385 * so it might be used externally. 386 */ 387 int 388 ELFNAME(load_file)(p, epp, path, vcset, entry, ap, last) 389 struct proc *p; 390 struct exec_package *epp; 391 char *path; 392 struct exec_vmcmd_set *vcset; 393 u_long *entry; 394 struct elf_args *ap; 395 Elf_Addr *last; 396 { 397 int error, i; 398 struct nameidata nd; 399 struct vnode *vp; 400 struct vattr attr; 401 Elf_Ehdr eh; 402 Elf_Phdr *ph = NULL; 403 Elf_Phdr *base_ph = NULL; 404 u_long phsize; 405 char *bp = NULL; 406 Elf_Addr addr = *last; 407 408 bp = path; 409 /* 410 * 1. open file 411 * 2. read filehdr 412 * 3. map text, data, and bss out of it using VM_* 413 */ 414 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, path, p); 415 if ((error = namei(&nd)) != 0) 416 return error; 417 vp = nd.ni_vp; 418 419 /* 420 * Similarly, if it's not marked as executable, or it's not a regular 421 * file, we don't allow it to be used. 422 */ 423 if (vp->v_type != VREG) { 424 error = EACCES; 425 goto badunlock; 426 } 427 if ((error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p)) != 0) 428 goto badunlock; 429 430 /* get attributes */ 431 if ((error = VOP_GETATTR(vp, &attr, p->p_ucred, p)) != 0) 432 goto badunlock; 433 434 /* 435 * Check mount point. Though we're not trying to exec this binary, 436 * we will be executing code from it, so if the mount point 437 * disallows execution or set-id-ness, we punt or kill the set-id. 438 */ 439 if (vp->v_mount->mnt_flag & MNT_NOEXEC) { 440 error = EACCES; 441 goto badunlock; 442 } 443 if (vp->v_mount->mnt_flag & MNT_NOSUID) 444 epp->ep_vap->va_mode &= ~(S_ISUID | S_ISGID); 445 446 #ifdef notyet /* XXX cgd 960926 */ 447 XXX cgd 960926: (maybe) VOP_OPEN it (and VOP_CLOSE in copyargs?) 448 #endif 449 VOP_UNLOCK(vp, 0); 450 451 if ((error = ELFNAME(read_from)(p, vp, 0, (caddr_t) &eh, 452 sizeof(eh))) != 0) 453 goto bad; 454 455 if ((error = ELFNAME(check_header)(&eh, ET_DYN)) != 0) 456 goto bad; 457 458 phsize = eh.e_phnum * sizeof(Elf_Phdr); 459 ph = (Elf_Phdr *)malloc(phsize, M_TEMP, M_WAITOK); 460 461 if ((error = ELFNAME(read_from)(p, vp, eh.e_phoff, 462 (caddr_t) ph, phsize)) != 0) 463 goto bad; 464 465 /* 466 * Load all the necessary sections 467 */ 468 for (i = 0; i < eh.e_phnum; i++) { 469 u_long size = 0; 470 int prot = 0; 471 int flags; 472 473 switch (ph[i].p_type) { 474 case PT_LOAD: 475 if (base_ph == NULL) { 476 addr = *last; 477 flags = VMCMD_BASE; 478 } else { 479 addr = ph[i].p_vaddr - base_ph->p_vaddr; 480 flags = VMCMD_RELATIVE; 481 } 482 ELFNAME(load_psection)(vcset, vp, &ph[i], &addr, 483 &size, &prot, flags); 484 /* If entry is within this section it must be text */ 485 if (eh.e_entry >= ph[i].p_vaddr && 486 eh.e_entry < (ph[i].p_vaddr + size)) { 487 /* XXX */ 488 *entry = addr + eh.e_entry; 489 #ifdef mips 490 *entry -= ph[i].p_vaddr; 491 #endif 492 ap->arg_interp = addr; 493 } 494 if (base_ph == NULL) 495 base_ph = &ph[i]; 496 addr += size; 497 break; 498 499 case PT_DYNAMIC: 500 case PT_PHDR: 501 case PT_NOTE: 502 break; 503 504 default: 505 break; 506 } 507 } 508 509 free((char *)ph, M_TEMP); 510 *last = addr; 511 vrele(vp); 512 return 0; 513 514 badunlock: 515 VOP_UNLOCK(vp, 0); 516 517 bad: 518 if (ph != NULL) 519 free((char *)ph, M_TEMP); 520 #ifdef notyet /* XXX cgd 960926 */ 521 (maybe) VOP_CLOSE it 522 #endif 523 vrele(vp); 524 return error; 525 } 526 527 /* 528 * exec_elf_makecmds(): Prepare an Elf binary's exec package 529 * 530 * First, set of the various offsets/lengths in the exec package. 531 * 532 * Then, mark the text image busy (so it can be demand paged) or error 533 * out if this is not possible. Finally, set up vmcmds for the 534 * text, data, bss, and stack segments. 535 */ 536 int 537 ELFNAME2(exec,makecmds)(p, epp) 538 struct proc *p; 539 struct exec_package *epp; 540 { 541 Elf_Ehdr *eh = epp->ep_hdr; 542 Elf_Phdr *ph, *pp; 543 Elf_Addr phdr = 0, pos = 0; 544 int error, i, n, nload; 545 char interp[MAXPATHLEN]; 546 u_long phsize; 547 548 if (epp->ep_hdrvalid < sizeof(Elf_Ehdr)) 549 return ENOEXEC; 550 551 /* 552 * XXX allow for executing shared objects. It seems silly 553 * but other ELF-based systems allow it as well. 554 */ 555 if (ELFNAME(check_header)(eh, ET_EXEC) != 0 && 556 ELFNAME(check_header)(eh, ET_DYN) != 0) 557 return ENOEXEC; 558 559 /* 560 * check if vnode is in open for writing, because we want to 561 * demand-page out of it. if it is, don't do it, for various 562 * reasons 563 */ 564 if (epp->ep_vp->v_writecount != 0) { 565 #ifdef DIAGNOSTIC 566 if (epp->ep_vp->v_flag & VTEXT) 567 panic("exec: a VTEXT vnode has writecount != 0\n"); 568 #endif 569 return ETXTBSY; 570 } 571 /* 572 * Allocate space to hold all the program headers, and read them 573 * from the file 574 */ 575 phsize = eh->e_phnum * sizeof(Elf_Phdr); 576 ph = (Elf_Phdr *)malloc(phsize, M_TEMP, M_WAITOK); 577 578 if ((error = ELFNAME(read_from)(p, epp->ep_vp, eh->e_phoff, 579 (caddr_t) ph, phsize)) != 0) 580 goto bad; 581 582 epp->ep_taddr = epp->ep_tsize = ELFDEFNNAME(NO_ADDR); 583 epp->ep_daddr = epp->ep_dsize = ELFDEFNNAME(NO_ADDR); 584 585 interp[0] = '\0'; 586 587 for (i = 0; i < eh->e_phnum; i++) { 588 pp = &ph[i]; 589 if (pp->p_type == PT_INTERP) { 590 if (pp->p_filesz >= sizeof(interp)) 591 goto bad; 592 if ((error = ELFNAME(read_from)(p, epp->ep_vp, 593 pp->p_offset, (caddr_t) interp, 594 pp->p_filesz)) != 0) 595 goto bad; 596 break; 597 } 598 } 599 600 /* 601 * Setup things for native emulation. 602 */ 603 epp->ep_emul = &ELFNAMEEND(emul_netbsd); 604 pos = ELFDEFNNAME(NO_ADDR); 605 606 /* 607 * On the same architecture, we may be emulating different systems. 608 * See which one will accept this executable. This currently only 609 * applies to SVR4, and IBCS2 on the i386 and Linux on the i386 610 * and the Alpha. 611 * 612 * Probe functions would normally see if the interpreter (if any) 613 * exists. Emulation packages may possibly replace the interpreter in 614 * interp[] with a changed path (/emul/xxx/<path>), and also 615 * set the ep_emul field in the exec package structure. 616 */ 617 n = sizeof(ELFNAME(probe_funcs)) / sizeof(ELFNAME(probe_funcs)[0]); 618 if (n != 0) { 619 error = ENOEXEC; 620 for (i = 0; i < n && error; i++) 621 error = ELFNAME(probe_funcs)[i](p, epp, eh, 622 interp, &pos); 623 #ifdef notyet 624 /* 625 * We should really use a signature in our native binaries 626 * and have our own probe function for matching binaries, 627 * before trying the emulations. For now, if the emulation 628 * probes failed we default to native. 629 */ 630 if (error) 631 goto bad; 632 #endif 633 } 634 635 /* 636 * Load all the necessary sections 637 */ 638 for (i = nload = 0; i < eh->e_phnum; i++) { 639 Elf_Addr addr = ELFDEFNNAME(NO_ADDR); 640 u_long size = 0; 641 int prot = 0; 642 643 pp = &ph[i]; 644 645 switch (ph[i].p_type) { 646 case PT_LOAD: 647 /* 648 * XXX 649 * Can handle only 2 sections: text and data 650 */ 651 if (nload++ == 2) 652 goto bad; 653 ELFNAME(load_psection)(&epp->ep_vmcmds, epp->ep_vp, 654 &ph[i], &addr, &size, &prot, 0); 655 656 /* 657 * Decide whether it's text or data by looking 658 * at the entry point. 659 */ 660 if (eh->e_entry >= addr && 661 eh->e_entry < (addr + size)) { 662 epp->ep_taddr = addr; 663 epp->ep_tsize = size; 664 if (epp->ep_daddr == ELFDEFNNAME(NO_ADDR)) { 665 epp->ep_daddr = addr; 666 epp->ep_dsize = size; 667 } 668 } else { 669 epp->ep_daddr = addr; 670 epp->ep_dsize = size; 671 } 672 break; 673 674 case PT_SHLIB: 675 #ifndef COMPAT_IBCS2 /* SCO has these sections */ 676 error = ENOEXEC; 677 goto bad; 678 #endif 679 680 case PT_INTERP: 681 /* Already did this one */ 682 case PT_DYNAMIC: 683 case PT_NOTE: 684 break; 685 686 case PT_PHDR: 687 /* Note address of program headers (in text segment) */ 688 phdr = pp->p_vaddr; 689 break; 690 691 default: 692 /* 693 * Not fatal; we don't need to understand everything. 694 */ 695 break; 696 } 697 } 698 699 /* this breaks on, e.g., OpenBSD-compatible mips shared binaries. */ 700 #ifndef ELF_INTERP_NON_RELOCATABLE 701 /* 702 * If no position to load the interpreter was set by a probe 703 * function, pick the same address that a non-fixed mmap(0, ..) 704 * would (i.e. something safely out of the way). 705 */ 706 if (pos == ELFDEFNNAME(NO_ADDR)) 707 pos = round_page(epp->ep_daddr + MAXDSIZ); 708 #endif /* !ELF_INTERP_NON_RELOCATABLE */ 709 710 /* 711 * Check if we found a dynamically linked binary and arrange to load 712 * it's interpreter 713 */ 714 if (interp[0]) { 715 struct elf_args *ap; 716 717 ap = (struct elf_args *)malloc(sizeof(struct elf_args), 718 M_TEMP, M_WAITOK); 719 if ((error = ELFNAME(load_file)(p, epp, interp, 720 &epp->ep_vmcmds, &epp->ep_entry, ap, &pos)) != 0) { 721 free((char *)ap, M_TEMP); 722 goto bad; 723 } 724 pos += phsize; 725 ap->arg_phaddr = phdr; 726 727 ap->arg_phentsize = eh->e_phentsize; 728 ap->arg_phnum = eh->e_phnum; 729 ap->arg_entry = eh->e_entry; 730 731 epp->ep_emul_arg = ap; 732 } else 733 epp->ep_entry = eh->e_entry; 734 735 #ifdef ELF_MAP_PAGE_ZERO 736 /* Dell SVR4 maps page zero, yeuch! */ 737 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, NBPG, 0, epp->ep_vp, 0, 738 VM_PROT_READ); 739 #endif 740 free((char *)ph, M_TEMP); 741 vn_marktext(epp->ep_vp); 742 return exec_elf_setup_stack(p, epp); 743 744 bad: 745 free((char *)ph, M_TEMP); 746 kill_vmcmds(&epp->ep_vmcmds); 747 return ENOEXEC; 748 } 749 750 int 751 ELFNAME2(netbsd,signature)(p, epp, eh) 752 struct proc *p; 753 struct exec_package *epp; 754 Elf_Ehdr *eh; 755 { 756 Elf_Phdr *hph, *ph; 757 Elf_Nhdr *np = NULL; 758 size_t phsize; 759 int error; 760 761 phsize = eh->e_phnum * sizeof(Elf_Phdr); 762 hph = (Elf_Phdr *)malloc(phsize, M_TEMP, M_WAITOK); 763 if ((error = ELFNAME(read_from)(p, epp->ep_vp, eh->e_phoff, 764 (caddr_t)hph, phsize)) != 0) 765 goto out1; 766 767 for (ph = hph; ph < &hph[eh->e_phnum]; ph++) { 768 if (ph->p_type != PT_NOTE || 769 ph->p_filesz < sizeof(Elf_Nhdr) + ELF_NOTE_NETBSD_NAMESZ) 770 continue; 771 772 np = (Elf_Nhdr *)malloc(ph->p_filesz, M_TEMP, M_WAITOK); 773 if ((error = ELFNAME(read_from)(p, epp->ep_vp, ph->p_offset, 774 (caddr_t)np, ph->p_filesz)) != 0) 775 goto out2; 776 777 if (np->n_type != ELF_NOTE_TYPE_OSVERSION) { 778 free(np, M_TEMP); 779 np = NULL; 780 continue; 781 } 782 783 /* Check the name and description sizes. */ 784 if (np->n_namesz != ELF_NOTE_NETBSD_NAMESZ || 785 np->n_descsz != ELF_NOTE_NETBSD_DESCSZ) 786 goto out3; 787 788 /* Is the name "NetBSD\0\0"? */ 789 if (memcmp((np + 1), ELF_NOTE_NETBSD_NAME, 790 ELF_NOTE_NETBSD_NAMESZ)) 791 goto out3; 792 793 /* XXX: We could check for the specific emulation here */ 794 /* All checks succeeded. */ 795 error = 0; 796 goto out2; 797 } 798 799 out3: 800 error = ENOEXEC; 801 out2: 802 if (np) 803 free(np, M_TEMP); 804 out1: 805 free(hph, M_TEMP); 806 return error; 807 } 808 809 static int 810 ELFNAME2(netbsd,probe)(p, epp, eh, itp, pos) 811 struct proc *p; 812 struct exec_package *epp; 813 Elf_Ehdr *eh; 814 char *itp; 815 Elf_Addr *pos; 816 { 817 int error; 818 819 if ((error = ELFNAME2(netbsd,signature)(p, epp, eh)) != 0) 820 return error; 821 epp->ep_emul = &ELFNAMEEND(emul_netbsd); 822 *pos = ELFDEFNNAME(NO_ADDR); 823 return 0; 824 } 825