exec_elf32.c revision 1.55
1/* $NetBSD: exec_elf32.c,v 1.55 2000/11/08 05:47:56 chs 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/proc.h> 80#include <sys/malloc.h> 81#include <sys/namei.h> 82#include <sys/vnode.h> 83#include <sys/exec.h> 84#include <sys/exec_elf.h> 85#include <sys/syscall.h> 86#include <sys/signalvar.h> 87#include <sys/mount.h> 88#include <sys/stat.h> 89 90#ifdef COMPAT_NETBSD32 91#include <compat/netbsd32/netbsd32_exec.h> 92#endif 93 94#ifdef COMPAT_LINUX 95#include <compat/linux/common/linux_exec.h> 96#endif 97 98#ifdef COMPAT_SVR4 99#include <compat/svr4/svr4_exec.h> 100#endif 101 102#ifdef COMPAT_IBCS2 103#include <compat/ibcs2/ibcs2_exec.h> 104#endif 105 106#ifdef COMPAT_FREEBSD 107#include <compat/freebsd/freebsd_exec.h> 108#endif 109 110int ELFNAME(check_header)(Elf_Ehdr *, int); 111int ELFNAME(load_file)(struct proc *, struct exec_package *, char *, 112 struct exec_vmcmd_set *, u_long *, struct elf_args *, Elf_Addr *); 113void ELFNAME(load_psection)(struct exec_vmcmd_set *, struct vnode *, 114 const Elf_Phdr *, Elf_Addr *, u_long *, int *, int); 115 116int ELFNAME2(netbsd,signature)(struct proc *, struct exec_package *, 117 Elf_Ehdr *); 118static int ELFNAME2(netbsd,probe)(struct proc *, struct exec_package *, 119 Elf_Ehdr *, char *, Elf_Addr *); 120 121extern char sigcode[], esigcode[]; 122#ifdef SYSCALL_DEBUG 123extern char *syscallnames[]; 124#endif 125 126struct emul ELFNAMEEND(emul_netbsd) = { 127 "netbsd", 128 NULL, 129 sendsig, 130 SYS_syscall, 131 SYS_MAXSYSCALL, 132 sysent, 133#ifdef SYSCALL_DEBUG 134 syscallnames, 135#else 136 NULL, 137#endif 138 howmany(ELF_AUX_ENTRIES * sizeof(AuxInfo), sizeof (Elf_Addr)), 139 ELFNAME(copyargs), 140 setregs, 141 sigcode, 142 esigcode, 143}; 144 145int (*ELFNAME(probe_funcs)[])(struct proc *, struct exec_package *, 146 Elf_Ehdr *, char *, Elf_Addr *) = { 147#if defined(COMPAT_NETBSD32) && (ELFSIZE == 32) 148 /* This one should go first so it matches instead of netbsd */ 149 ELFNAME2(netbsd32,probe), 150#endif 151 ELFNAME2(netbsd,probe), 152#if defined(COMPAT_FREEBSD) && (ELFSIZE == 32) 153 ELFNAME2(freebsd,probe), /* XXX not 64-bit safe */ 154#endif 155#if defined(COMPAT_LINUX) 156 ELFNAME2(linux,probe), 157#endif 158#if defined(COMPAT_SVR4) && (ELFSIZE == 32) 159 ELFNAME2(svr4,probe), /* XXX not 64-bit safe */ 160#endif 161#if defined(COMPAT_IBCS2) && (ELFSIZE == 32) 162 ELFNAME2(ibcs2,probe), /* XXX not 64-bit safe */ 163#endif 164}; 165 166/* round up and down to page boundaries. */ 167#define ELF_ROUND(a, b) (((a) + (b) - 1) & ~((b) - 1)) 168#define ELF_TRUNC(a, b) ((a) & ~((b) - 1)) 169 170/* 171 * Copy arguments onto the stack in the normal way, but add some 172 * extra information in case of dynamic binding. 173 */ 174void * 175ELFNAME(copyargs)(struct exec_package *pack, struct ps_strings *arginfo, 176 void *stack, void *argp) 177{ 178 size_t len; 179 AuxInfo ai[ELF_AUX_ENTRIES], *a; 180 struct elf_args *ap; 181 182 stack = copyargs(pack, arginfo, stack, argp); 183 if (!stack) 184 return NULL; 185 186 a = ai; 187 188 /* 189 * Push extra arguments on the stack needed by dynamically 190 * linked binaries 191 */ 192 if ((ap = (struct elf_args *)pack->ep_emul_arg)) { 193 194 a->a_type = AT_PHDR; 195 a->a_v = ap->arg_phaddr; 196 a++; 197 198 a->a_type = AT_PHENT; 199 a->a_v = ap->arg_phentsize; 200 a++; 201 202 a->a_type = AT_PHNUM; 203 a->a_v = ap->arg_phnum; 204 a++; 205 206 a->a_type = AT_PAGESZ; 207 a->a_v = NBPG; 208 a++; 209 210 a->a_type = AT_BASE; 211 a->a_v = ap->arg_interp; 212 a++; 213 214 a->a_type = AT_FLAGS; 215 a->a_v = 0; 216 a++; 217 218 a->a_type = AT_ENTRY; 219 a->a_v = ap->arg_entry; 220 a++; 221 222 free((char *)ap, M_TEMP); 223 pack->ep_emul_arg = NULL; 224 } 225 226 a->a_type = AT_NULL; 227 a->a_v = 0; 228 a++; 229 230 len = (a - ai) * sizeof(AuxInfo); 231 if (copyout(ai, stack, len)) 232 return NULL; 233 stack = (caddr_t)stack + len; 234 235 return stack; 236} 237 238/* 239 * elf_check_header(): 240 * 241 * Check header for validity; return 0 of ok ENOEXEC if error 242 */ 243int 244ELFNAME(check_header)(Elf_Ehdr *eh, int type) 245{ 246 247 if (memcmp(eh->e_ident, ELFMAG, SELFMAG) != 0 || 248 eh->e_ident[EI_CLASS] != ELFCLASS) 249 return ENOEXEC; 250 251 switch (eh->e_machine) { 252 253 ELFDEFNNAME(MACHDEP_ID_CASES) 254 255 default: 256 return ENOEXEC; 257 } 258 259 if (eh->e_type != type) 260 return ENOEXEC; 261 262 return 0; 263} 264 265/* 266 * elf_load_psection(): 267 * 268 * Load a psection at the appropriate address 269 */ 270void 271ELFNAME(load_psection)(struct exec_vmcmd_set *vcset, struct vnode *vp, 272 const Elf_Phdr *ph, Elf_Addr *addr, u_long *size, int *prot, int flags) 273{ 274 u_long uaddr, msize, psize, rm, rf; 275 long diff, offset; 276 277 /* 278 * If the user specified an address, then we load there. 279 */ 280 if (*addr != ELFDEFNNAME(NO_ADDR)) { 281 if (ph->p_align > 1) { 282 *addr = ELF_TRUNC(*addr, ph->p_align); 283 uaddr = ELF_TRUNC(ph->p_vaddr, ph->p_align); 284 } else 285 uaddr = ph->p_vaddr; 286 diff = ph->p_vaddr - uaddr; 287 } else { 288 *addr = uaddr = ph->p_vaddr; 289 if (ph->p_align > 1) 290 *addr = ELF_TRUNC(uaddr, ph->p_align); 291 diff = uaddr - *addr; 292 } 293 294 *prot |= (ph->p_flags & PF_R) ? VM_PROT_READ : 0; 295 *prot |= (ph->p_flags & PF_W) ? VM_PROT_WRITE : 0; 296 *prot |= (ph->p_flags & PF_X) ? VM_PROT_EXECUTE : 0; 297 298 offset = ph->p_offset - diff; 299 *size = ph->p_filesz + diff; 300 msize = ph->p_memsz + diff; 301 psize = round_page(*size); 302 303 if ((ph->p_flags & PF_W) != 0) { 304 /* 305 * Because the pagedvn pager can't handle zero fill of the last 306 * data page if it's not page aligned we map the last page 307 * readvn. 308 */ 309 psize = trunc_page(*size); 310 } 311 if (psize > 0) { 312 NEW_VMCMD2(vcset, vmcmd_map_pagedvn, psize, *addr, vp, 313 offset, *prot, flags); 314 } 315 if (psize < *size) { 316 NEW_VMCMD2(vcset, vmcmd_map_readvn, *size - psize, 317 *addr + psize, vp, offset + psize, *prot, 318 psize > 0 ? flags & VMCMD_RELATIVE : flags); 319 } 320 321 /* 322 * Check if we need to extend the size of the segment 323 */ 324 rm = round_page(*addr + msize); 325 rf = round_page(*addr + *size); 326 327 if (rm != rf) { 328 NEW_VMCMD2(vcset, vmcmd_map_zero, rm - rf, rf, NULLVP, 329 0, *prot, flags & VMCMD_RELATIVE); 330 *size = msize; 331 } 332} 333 334/* 335 * elf_read_from(): 336 * 337 * Read from vnode into buffer at offset. 338 */ 339int 340ELFNAME(read_from)(struct proc *p, struct vnode *vp, u_long off, 341 caddr_t buf, int size) 342{ 343 int error; 344 size_t resid; 345 346 if ((error = vn_rdwr(UIO_READ, vp, buf, size, off, UIO_SYSSPACE, 347 0, p->p_ucred, &resid, p)) != 0) 348 return error; 349 /* 350 * See if we got all of it 351 */ 352 if (resid != 0) 353 return ENOEXEC; 354 return 0; 355} 356 357/* 358 * elf_load_file(): 359 * 360 * Load a file (interpreter/library) pointed to by path 361 * [stolen from coff_load_shlib()]. Made slightly generic 362 * so it might be used externally. 363 */ 364int 365ELFNAME(load_file)(struct proc *p, struct exec_package *epp, char *path, 366 struct exec_vmcmd_set *vcset, u_long *entry, struct elf_args *ap, 367 Elf_Addr *last) 368{ 369 int error, i; 370 struct nameidata nd; 371 struct vnode *vp; 372 struct vattr attr; 373 Elf_Ehdr eh; 374 Elf_Phdr *ph = NULL; 375 Elf_Phdr *base_ph = NULL; 376 u_long phsize; 377 char *bp = NULL; 378 Elf_Addr addr = *last; 379 380 bp = path; 381 /* 382 * 1. open file 383 * 2. read filehdr 384 * 3. map text, data, and bss out of it using VM_* 385 */ 386 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, path, p); 387 if ((error = namei(&nd)) != 0) 388 return error; 389 vp = nd.ni_vp; 390 391 /* 392 * Similarly, if it's not marked as executable, or it's not a regular 393 * file, we don't allow it to be used. 394 */ 395 if (vp->v_type != VREG) { 396 error = EACCES; 397 goto badunlock; 398 } 399 if ((error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p)) != 0) 400 goto badunlock; 401 402 /* get attributes */ 403 if ((error = VOP_GETATTR(vp, &attr, p->p_ucred, p)) != 0) 404 goto badunlock; 405 406 /* 407 * Check mount point. Though we're not trying to exec this binary, 408 * we will be executing code from it, so if the mount point 409 * disallows execution or set-id-ness, we punt or kill the set-id. 410 */ 411 if (vp->v_mount->mnt_flag & MNT_NOEXEC) { 412 error = EACCES; 413 goto badunlock; 414 } 415 if (vp->v_mount->mnt_flag & MNT_NOSUID) 416 epp->ep_vap->va_mode &= ~(S_ISUID | S_ISGID); 417 418#ifdef notyet /* XXX cgd 960926 */ 419 XXX cgd 960926: (maybe) VOP_OPEN it (and VOP_CLOSE in copyargs?) 420#endif 421 VOP_UNLOCK(vp, 0); 422 423 if ((error = ELFNAME(read_from)(p, vp, 0, (caddr_t) &eh, 424 sizeof(eh))) != 0) 425 goto bad; 426 427 if ((error = ELFNAME(check_header)(&eh, ET_DYN)) != 0) 428 goto bad; 429 430 phsize = eh.e_phnum * sizeof(Elf_Phdr); 431 ph = (Elf_Phdr *)malloc(phsize, M_TEMP, M_WAITOK); 432 433 if ((error = ELFNAME(read_from)(p, vp, eh.e_phoff, 434 (caddr_t) ph, phsize)) != 0) 435 goto bad; 436 437 /* 438 * Load all the necessary sections 439 */ 440 for (i = 0; i < eh.e_phnum; i++) { 441 u_long size = 0; 442 int prot = 0; 443 int flags; 444 445 switch (ph[i].p_type) { 446 case PT_LOAD: 447 if (base_ph == NULL) { 448 addr = *last; 449 flags = VMCMD_BASE; 450 } else { 451 addr = ph[i].p_vaddr - base_ph->p_vaddr; 452 flags = VMCMD_RELATIVE; 453 } 454 ELFNAME(load_psection)(vcset, vp, &ph[i], &addr, 455 &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 /* XXX */ 460 *entry = addr + eh.e_entry; 461#ifdef mips 462 *entry -= ph[i].p_vaddr; 463#endif 464 ap->arg_interp = addr; 465 } 466 if (base_ph == NULL) 467 base_ph = &ph[i]; 468 addr += size; 469 break; 470 471 case PT_DYNAMIC: 472 case PT_PHDR: 473 case PT_NOTE: 474 break; 475 476 default: 477 break; 478 } 479 } 480 481 free((char *)ph, M_TEMP); 482 *last = addr; 483 vrele(vp); 484 return 0; 485 486badunlock: 487 VOP_UNLOCK(vp, 0); 488 489bad: 490 if (ph != NULL) 491 free((char *)ph, M_TEMP); 492#ifdef notyet /* XXX cgd 960926 */ 493 (maybe) VOP_CLOSE it 494#endif 495 vrele(vp); 496 return error; 497} 498 499/* 500 * exec_elf_makecmds(): Prepare an Elf binary's exec package 501 * 502 * First, set of the various offsets/lengths in the exec package. 503 * 504 * Then, mark the text image busy (so it can be demand paged) or error 505 * out if this is not possible. Finally, set up vmcmds for the 506 * text, data, bss, and stack segments. 507 */ 508int 509ELFNAME2(exec,makecmds)(struct proc *p, struct exec_package *epp) 510{ 511 Elf_Ehdr *eh = epp->ep_hdr; 512 Elf_Phdr *ph, *pp; 513 Elf_Addr phdr = 0, pos = 0; 514 int error, i, n, nload; 515 char interp[MAXPATHLEN]; 516 u_long phsize; 517 518 if (epp->ep_hdrvalid < sizeof(Elf_Ehdr)) 519 return ENOEXEC; 520 521 /* 522 * XXX allow for executing shared objects. It seems silly 523 * but other ELF-based systems allow it as well. 524 */ 525 if (ELFNAME(check_header)(eh, ET_EXEC) != 0 && 526 ELFNAME(check_header)(eh, ET_DYN) != 0) 527 return ENOEXEC; 528 529 /* 530 * check if vnode is in open for writing, because we want to 531 * demand-page out of it. if it is, don't do it, for various 532 * reasons 533 */ 534 if (epp->ep_vp->v_writecount != 0) { 535#ifdef DIAGNOSTIC 536 if (epp->ep_vp->v_flag & VTEXT) 537 panic("exec: a VTEXT vnode has writecount != 0\n"); 538#endif 539 return ETXTBSY; 540 } 541 /* 542 * Allocate space to hold all the program headers, and read them 543 * from the file 544 */ 545 phsize = eh->e_phnum * sizeof(Elf_Phdr); 546 ph = (Elf_Phdr *)malloc(phsize, M_TEMP, M_WAITOK); 547 548 if ((error = ELFNAME(read_from)(p, epp->ep_vp, eh->e_phoff, 549 (caddr_t) ph, phsize)) != 0) 550 goto bad; 551 552 epp->ep_taddr = epp->ep_tsize = ELFDEFNNAME(NO_ADDR); 553 epp->ep_daddr = epp->ep_dsize = ELFDEFNNAME(NO_ADDR); 554 555 interp[0] = '\0'; 556 557 for (i = 0; i < eh->e_phnum; i++) { 558 pp = &ph[i]; 559 if (pp->p_type == PT_INTERP) { 560 if (pp->p_filesz >= sizeof(interp)) 561 goto bad; 562 if ((error = ELFNAME(read_from)(p, epp->ep_vp, 563 pp->p_offset, (caddr_t) interp, 564 pp->p_filesz)) != 0) 565 goto bad; 566 break; 567 } 568 } 569 570 /* 571 * Setup things for native emulation. 572 */ 573 epp->ep_emul = &ELFNAMEEND(emul_netbsd); 574 pos = ELFDEFNNAME(NO_ADDR); 575 576 /* 577 * On the same architecture, we may be emulating different systems. 578 * See which one will accept this executable. This currently only 579 * applies to SVR4, and IBCS2 on the i386 and Linux on the i386 580 * and the Alpha. 581 * 582 * Probe functions would normally see if the interpreter (if any) 583 * exists. Emulation packages may possibly replace the interpreter in 584 * interp[] with a changed path (/emul/xxx/<path>), and also 585 * set the ep_emul field in the exec package structure. 586 */ 587 n = sizeof(ELFNAME(probe_funcs)) / sizeof(ELFNAME(probe_funcs)[0]); 588 if (n != 0) { 589 error = ENOEXEC; 590 for (i = 0; i < n && error; i++) 591 error = ELFNAME(probe_funcs)[i](p, epp, eh, 592 interp, &pos); 593#ifdef notyet 594 /* 595 * We should really use a signature in our native binaries 596 * and have our own probe function for matching binaries, 597 * before trying the emulations. For now, if the emulation 598 * probes failed we default to native. 599 */ 600 if (error) 601 goto bad; 602#endif 603 } 604 605 /* 606 * Load all the necessary sections 607 */ 608 for (i = nload = 0; i < eh->e_phnum; i++) { 609 Elf_Addr addr = ELFDEFNNAME(NO_ADDR); 610 u_long size = 0; 611 int prot = 0; 612 613 pp = &ph[i]; 614 615 switch (ph[i].p_type) { 616 case PT_LOAD: 617 /* 618 * XXX 619 * Can handle only 2 sections: text and data 620 */ 621 if (nload++ == 2) 622 goto bad; 623 ELFNAME(load_psection)(&epp->ep_vmcmds, epp->ep_vp, 624 &ph[i], &addr, &size, &prot, 0); 625 626 /* 627 * Decide whether it's text or data by looking 628 * at the entry point. 629 */ 630 if (eh->e_entry >= addr && 631 eh->e_entry < (addr + size)) { 632 epp->ep_taddr = addr; 633 epp->ep_tsize = size; 634 if (epp->ep_daddr == ELFDEFNNAME(NO_ADDR)) { 635 epp->ep_daddr = addr; 636 epp->ep_dsize = size; 637 } 638 } else { 639 epp->ep_daddr = addr; 640 epp->ep_dsize = size; 641 } 642 break; 643 644 case PT_SHLIB: 645#ifndef COMPAT_IBCS2 /* SCO has these sections */ 646 error = ENOEXEC; 647 goto bad; 648#endif 649 650 case PT_INTERP: 651 /* Already did this one */ 652 case PT_DYNAMIC: 653 case PT_NOTE: 654 break; 655 656 case PT_PHDR: 657 /* Note address of program headers (in text segment) */ 658 phdr = pp->p_vaddr; 659 break; 660 661 default: 662 /* 663 * Not fatal; we don't need to understand everything. 664 */ 665 break; 666 } 667 } 668 669 /* this breaks on, e.g., OpenBSD-compatible mips shared binaries. */ 670#ifndef ELF_INTERP_NON_RELOCATABLE 671 /* 672 * If no position to load the interpreter was set by a probe 673 * function, pick the same address that a non-fixed mmap(0, ..) 674 * would (i.e. something safely out of the way). 675 */ 676 if (pos == ELFDEFNNAME(NO_ADDR)) 677 pos = round_page(epp->ep_daddr + MAXDSIZ); 678#endif /* !ELF_INTERP_NON_RELOCATABLE */ 679 680 /* 681 * Check if we found a dynamically linked binary and arrange to load 682 * it's interpreter 683 */ 684 if (interp[0]) { 685 struct elf_args *ap; 686 687 ap = (struct elf_args *)malloc(sizeof(struct elf_args), 688 M_TEMP, M_WAITOK); 689 if ((error = ELFNAME(load_file)(p, epp, interp, 690 &epp->ep_vmcmds, &epp->ep_entry, ap, &pos)) != 0) { 691 free((char *)ap, M_TEMP); 692 goto bad; 693 } 694 pos += phsize; 695 ap->arg_phaddr = phdr; 696 697 ap->arg_phentsize = eh->e_phentsize; 698 ap->arg_phnum = eh->e_phnum; 699 ap->arg_entry = eh->e_entry; 700 701 epp->ep_emul_arg = ap; 702 } else 703 epp->ep_entry = eh->e_entry; 704 705#ifdef ELF_MAP_PAGE_ZERO 706 /* Dell SVR4 maps page zero, yeuch! */ 707 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, NBPG, 0, epp->ep_vp, 0, 708 VM_PROT_READ); 709#endif 710 free((char *)ph, M_TEMP); 711 vn_marktext(epp->ep_vp); 712 return exec_elf_setup_stack(p, epp); 713 714bad: 715 free((char *)ph, M_TEMP); 716 kill_vmcmds(&epp->ep_vmcmds); 717 return ENOEXEC; 718} 719 720int 721ELFNAME2(netbsd,signature)(struct proc *p, struct exec_package *epp, 722 Elf_Ehdr *eh) 723{ 724 Elf_Phdr *hph, *ph; 725 Elf_Nhdr *np = NULL; 726 size_t phsize; 727 int error; 728 729 phsize = eh->e_phnum * sizeof(Elf_Phdr); 730 hph = (Elf_Phdr *)malloc(phsize, M_TEMP, M_WAITOK); 731 if ((error = ELFNAME(read_from)(p, epp->ep_vp, eh->e_phoff, 732 (caddr_t)hph, phsize)) != 0) 733 goto out1; 734 735 for (ph = hph; ph < &hph[eh->e_phnum]; ph++) { 736 if (ph->p_type != PT_NOTE || 737 ph->p_filesz < sizeof(Elf_Nhdr) + ELF_NOTE_NETBSD_NAMESZ) 738 continue; 739 740 np = (Elf_Nhdr *)malloc(ph->p_filesz, M_TEMP, M_WAITOK); 741 if ((error = ELFNAME(read_from)(p, epp->ep_vp, ph->p_offset, 742 (caddr_t)np, ph->p_filesz)) != 0) 743 goto out2; 744 745 if (np->n_type != ELF_NOTE_TYPE_OSVERSION) { 746 free(np, M_TEMP); 747 np = NULL; 748 continue; 749 } 750 751 /* Check the name and description sizes. */ 752 if (np->n_namesz != ELF_NOTE_NETBSD_NAMESZ || 753 np->n_descsz != ELF_NOTE_NETBSD_DESCSZ) 754 goto out3; 755 756 /* Is the name "NetBSD\0\0"? */ 757 if (memcmp((np + 1), ELF_NOTE_NETBSD_NAME, 758 ELF_NOTE_NETBSD_NAMESZ)) 759 goto out3; 760 761 /* XXX: We could check for the specific emulation here */ 762 /* All checks succeeded. */ 763 error = 0; 764 goto out2; 765 } 766 767out3: 768 error = ENOEXEC; 769out2: 770 if (np) 771 free(np, M_TEMP); 772out1: 773 free(hph, M_TEMP); 774 return error; 775} 776 777static int 778ELFNAME2(netbsd,probe)(struct proc *p, struct exec_package *epp, 779 Elf_Ehdr *eh, char *itp, Elf_Addr *pos) 780{ 781 int error; 782 783 if ((error = ELFNAME2(netbsd,signature)(p, epp, eh)) != 0) 784 return error; 785 epp->ep_emul = &ELFNAMEEND(emul_netbsd); 786 *pos = ELFDEFNNAME(NO_ADDR); 787 return 0; 788} 789