exec_elf32.c revision 1.51
1/* $NetBSD: exec_elf32.c,v 1.51 2000/06/27 17:41:09 mrg 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 118int ELFNAME(check_header) __P((Elf_Ehdr *, int)); 119int ELFNAME(load_file) __P((struct proc *, struct exec_package *, char *, 120 struct exec_vmcmd_set *, u_long *, struct elf_args *, Elf_Addr *)); 121void ELFNAME(load_psection) __P((struct exec_vmcmd_set *, struct vnode *, 122 Elf_Phdr *, Elf_Addr *, u_long *, int *)); 123 124int ELFNAME2(netbsd,signature) __P((struct proc *, struct exec_package *, 125 Elf_Ehdr *)); 126static int ELFNAME2(netbsd,probe) __P((struct proc *, struct exec_package *, 127 Elf_Ehdr *, char *, Elf_Addr *)); 128 129extern char sigcode[], esigcode[]; 130#ifdef SYSCALL_DEBUG 131extern char *syscallnames[]; 132#endif 133 134struct 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 153int (*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 */ 182void * 183ELFNAME(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 */ 254int 255ELFNAME(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) 262 263 switch (eh->e_machine) { 264 265 ELFDEFNNAME(MACHDEP_ID_CASES) 266 267 default: 268 return ENOEXEC; 269 } 270 271 if (eh->e_type != type) 272 return ENOEXEC; 273 274 return 0; 275} 276 277/* 278 * elf_load_psection(): 279 * 280 * Load a psection at the appropriate address 281 */ 282void 283ELFNAME(load_psection)(vcset, vp, ph, addr, size, prot) 284 struct exec_vmcmd_set *vcset; 285 struct vnode *vp; 286 Elf_Phdr *ph; 287 Elf_Addr *addr; 288 u_long *size; 289 int *prot; 290{ 291 u_long uaddr, msize, psize, rm, rf; 292 long diff, offset; 293 294 /* 295 * If the user specified an address, then we load there. 296 */ 297 if (*addr != ELFDEFNNAME(NO_ADDR)) { 298 if (ph->p_align > 1) { 299 *addr = ELF_ROUND(*addr, ph->p_align); 300 uaddr = ELF_TRUNC(ph->p_vaddr, ph->p_align); 301 } else 302 uaddr = ph->p_vaddr; 303 diff = ph->p_vaddr - uaddr; 304 } else { 305 *addr = uaddr = ph->p_vaddr; 306 if (ph->p_align > 1) 307 *addr = ELF_TRUNC(uaddr, ph->p_align); 308 diff = uaddr - *addr; 309 } 310 311 *prot |= (ph->p_flags & PF_R) ? VM_PROT_READ : 0; 312 *prot |= (ph->p_flags & PF_W) ? VM_PROT_WRITE : 0; 313 *prot |= (ph->p_flags & PF_X) ? VM_PROT_EXECUTE : 0; 314 315 offset = ph->p_offset - diff; 316 *size = ph->p_filesz + diff; 317 msize = ph->p_memsz + diff; 318 psize = round_page(*size); 319 320 if ((ph->p_flags & PF_W) != 0) { 321 /* 322 * Because the pagedvn pager can't handle zero fill of the last 323 * data page if it's not page aligned we map the last page 324 * readvn. 325 */ 326 psize = trunc_page(*size); 327 NEW_VMCMD(vcset, vmcmd_map_pagedvn, psize, *addr, vp, 328 offset, *prot); 329 if(psize != *size) 330 NEW_VMCMD(vcset, vmcmd_map_readvn, *size - psize, 331 *addr + psize, vp, offset + psize, *prot); 332 } else 333 NEW_VMCMD(vcset, vmcmd_map_pagedvn, psize, *addr, vp, 334 offset, *prot); 335 336 /* 337 * Check if we need to extend the size of the segment 338 */ 339 rm = round_page(*addr + msize); 340 rf = round_page(*addr + *size); 341 342 if (rm != rf) { 343 NEW_VMCMD(vcset, vmcmd_map_zero, rm - rf, rf, NULLVP, 344 0, *prot); 345 *size = msize; 346 } 347} 348 349/* 350 * elf_read_from(): 351 * 352 * Read from vnode into buffer at offset. 353 */ 354int 355ELFNAME(read_from)(p, vp, off, buf, size) 356 struct vnode *vp; 357 u_long off; 358 struct proc *p; 359 caddr_t buf; 360 int size; 361{ 362 int error; 363 size_t resid; 364 365 if ((error = vn_rdwr(UIO_READ, vp, buf, size, off, UIO_SYSSPACE, 366 0, p->p_ucred, &resid, p)) != 0) 367 return error; 368 /* 369 * See if we got all of it 370 */ 371 if (resid != 0) 372 return ENOEXEC; 373 return 0; 374} 375 376/* 377 * elf_load_file(): 378 * 379 * Load a file (interpreter/library) pointed to by path 380 * [stolen from coff_load_shlib()]. Made slightly generic 381 * so it might be used externally. 382 */ 383int 384ELFNAME(load_file)(p, epp, path, vcset, entry, ap, last) 385 struct proc *p; 386 struct exec_package *epp; 387 char *path; 388 struct exec_vmcmd_set *vcset; 389 u_long *entry; 390 struct elf_args *ap; 391 Elf_Addr *last; 392{ 393 int error, i; 394 struct nameidata nd; 395 struct vnode *vp; 396 struct vattr attr; 397 Elf_Ehdr eh; 398 Elf_Phdr *ph = NULL; 399 u_long phsize; 400 char *bp = NULL; 401 Elf_Addr addr = *last; 402 403 bp = path; 404 /* 405 * 1. open file 406 * 2. read filehdr 407 * 3. map text, data, and bss out of it using VM_* 408 */ 409 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, path, p); 410 if ((error = namei(&nd)) != 0) 411 return error; 412 vp = nd.ni_vp; 413 414 /* 415 * Similarly, if it's not marked as executable, or it's not a regular 416 * file, we don't allow it to be used. 417 */ 418 if (vp->v_type != VREG) { 419 error = EACCES; 420 goto badunlock; 421 } 422 if ((error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p)) != 0) 423 goto badunlock; 424 425 /* get attributes */ 426 if ((error = VOP_GETATTR(vp, &attr, p->p_ucred, p)) != 0) 427 goto badunlock; 428 429 /* 430 * Check mount point. Though we're not trying to exec this binary, 431 * we will be executing code from it, so if the mount point 432 * disallows execution or set-id-ness, we punt or kill the set-id. 433 */ 434 if (vp->v_mount->mnt_flag & MNT_NOEXEC) { 435 error = EACCES; 436 goto badunlock; 437 } 438 if (vp->v_mount->mnt_flag & MNT_NOSUID) 439 epp->ep_vap->va_mode &= ~(S_ISUID | S_ISGID); 440 441#ifdef notyet /* XXX cgd 960926 */ 442 XXX cgd 960926: (maybe) VOP_OPEN it (and VOP_CLOSE in copyargs?) 443#endif 444 VOP_UNLOCK(vp, 0); 445 446 if ((error = ELFNAME(read_from)(p, vp, 0, (caddr_t) &eh, 447 sizeof(eh))) != 0) 448 goto bad; 449 450 if ((error = ELFNAME(check_header)(&eh, ET_DYN)) != 0) 451 goto bad; 452 453 phsize = eh.e_phnum * sizeof(Elf_Phdr); 454 ph = (Elf_Phdr *)malloc(phsize, M_TEMP, M_WAITOK); 455 456 if ((error = ELFNAME(read_from)(p, vp, eh.e_phoff, 457 (caddr_t) ph, phsize)) != 0) 458 goto bad; 459 460 /* 461 * Load all the necessary sections 462 */ 463 for (i = 0; i < eh.e_phnum; i++) { 464 u_long size = 0; 465 int prot = 0; 466 467 switch (ph[i].p_type) { 468 case PT_LOAD: 469 ELFNAME(load_psection)(vcset, vp, &ph[i], &addr, 470 &size, &prot); 471 /* If entry is within this section it must be text */ 472 if (eh.e_entry >= ph[i].p_vaddr && 473 eh.e_entry < (ph[i].p_vaddr + size)) { 474 /* XXX */ 475 *entry = addr + eh.e_entry; 476#ifdef mips 477 *entry -= ph[i].p_vaddr; 478#endif 479 ap->arg_interp = addr; 480 } 481 addr += size; 482 break; 483 484 case PT_DYNAMIC: 485 case PT_PHDR: 486 case PT_NOTE: 487 break; 488 489 default: 490 break; 491 } 492 } 493 494 free((char *)ph, M_TEMP); 495 *last = addr; 496 vrele(vp); 497 return 0; 498 499badunlock: 500 VOP_UNLOCK(vp, 0); 501 502bad: 503 if (ph != NULL) 504 free((char *)ph, M_TEMP); 505#ifdef notyet /* XXX cgd 960926 */ 506 (maybe) VOP_CLOSE it 507#endif 508 vrele(vp); 509 return error; 510} 511 512/* 513 * exec_elf_makecmds(): Prepare an Elf binary's exec package 514 * 515 * First, set of the various offsets/lengths in the exec package. 516 * 517 * Then, mark the text image busy (so it can be demand paged) or error 518 * out if this is not possible. Finally, set up vmcmds for the 519 * text, data, bss, and stack segments. 520 */ 521int 522ELFNAME2(exec,makecmds)(p, epp) 523 struct proc *p; 524 struct exec_package *epp; 525{ 526 Elf_Ehdr *eh = epp->ep_hdr; 527 Elf_Phdr *ph, *pp; 528 Elf_Addr phdr = 0, pos = 0; 529 int error, i, n, nload; 530 char interp[MAXPATHLEN]; 531 u_long phsize; 532 533 if (epp->ep_hdrvalid < sizeof(Elf_Ehdr)) 534 return ENOEXEC; 535 536 /* 537 * XXX allow for executing shared objects. It seems silly 538 * but other ELF-based systems allow it as well. 539 */ 540 if (ELFNAME(check_header)(eh, ET_EXEC) != 0 && 541 ELFNAME(check_header)(eh, ET_DYN) != 0) 542 return ENOEXEC; 543 544 /* 545 * check if vnode is in open for writing, because we want to 546 * demand-page out of it. if it is, don't do it, for various 547 * reasons 548 */ 549 if (epp->ep_vp->v_writecount != 0) { 550#ifdef DIAGNOSTIC 551 if (epp->ep_vp->v_flag & VTEXT) 552 panic("exec: a VTEXT vnode has writecount != 0\n"); 553#endif 554 return ETXTBSY; 555 } 556 /* 557 * Allocate space to hold all the program headers, and read them 558 * from the file 559 */ 560 phsize = eh->e_phnum * sizeof(Elf_Phdr); 561 ph = (Elf_Phdr *)malloc(phsize, M_TEMP, M_WAITOK); 562 563 if ((error = ELFNAME(read_from)(p, epp->ep_vp, eh->e_phoff, 564 (caddr_t) ph, phsize)) != 0) 565 goto bad; 566 567 epp->ep_taddr = epp->ep_tsize = ELFDEFNNAME(NO_ADDR); 568 epp->ep_daddr = epp->ep_dsize = ELFDEFNNAME(NO_ADDR); 569 570 interp[0] = '\0'; 571 572 for (i = 0; i < eh->e_phnum; i++) { 573 pp = &ph[i]; 574 if (pp->p_type == PT_INTERP) { 575 if (pp->p_filesz >= sizeof(interp)) 576 goto bad; 577 if ((error = ELFNAME(read_from)(p, epp->ep_vp, 578 pp->p_offset, (caddr_t) interp, 579 pp->p_filesz)) != 0) 580 goto bad; 581 break; 582 } 583 } 584 585 /* 586 * Setup things for native emulation. 587 */ 588 epp->ep_emul = &ELFNAMEEND(emul_netbsd); 589 pos = ELFDEFNNAME(NO_ADDR); 590 591 /* 592 * On the same architecture, we may be emulating different systems. 593 * See which one will accept this executable. This currently only 594 * applies to SVR4, and IBCS2 on the i386 and Linux on the i386 595 * and the Alpha. 596 * 597 * Probe functions would normally see if the interpreter (if any) 598 * exists. Emulation packages may possibly replace the interpreter in 599 * interp[] with a changed path (/emul/xxx/<path>), and also 600 * set the ep_emul field in the exec package structure. 601 */ 602 n = sizeof(ELFNAME(probe_funcs)) / sizeof(ELFNAME(probe_funcs)[0]); 603 if (n != 0) { 604 error = ENOEXEC; 605 for (i = 0; i < n && error; i++) 606 error = ELFNAME(probe_funcs)[i](p, epp, eh, 607 interp, &pos); 608#ifdef notyet 609 /* 610 * We should really use a signature in our native binaries 611 * and have our own probe function for matching binaries, 612 * before trying the emulations. For now, if the emulation 613 * probes failed we default to native. 614 */ 615 if (error) 616 goto bad; 617#endif 618 } 619 620 /* 621 * Load all the necessary sections 622 */ 623 for (i = nload = 0; i < eh->e_phnum; i++) { 624 Elf_Addr addr = ELFDEFNNAME(NO_ADDR); 625 u_long size = 0; 626 int prot = 0; 627 628 pp = &ph[i]; 629 630 switch (ph[i].p_type) { 631 case PT_LOAD: 632 /* 633 * XXX 634 * Can handle only 2 sections: text and data 635 */ 636 if (nload++ == 2) 637 goto bad; 638 ELFNAME(load_psection)(&epp->ep_vmcmds, epp->ep_vp, 639 &ph[i], &addr, &size, &prot); 640 641 /* 642 * Decide whether it's text or data by looking 643 * at the entry point. 644 */ 645 if (eh->e_entry >= addr && 646 eh->e_entry < (addr + size)) { 647 epp->ep_taddr = addr; 648 epp->ep_tsize = size; 649 if (epp->ep_daddr == ELFDEFNNAME(NO_ADDR)) { 650 epp->ep_daddr = addr; 651 epp->ep_dsize = size; 652 } 653 } else { 654 epp->ep_daddr = addr; 655 epp->ep_dsize = size; 656 } 657 break; 658 659 case PT_SHLIB: 660#ifndef COMPAT_IBCS2 /* SCO has these sections */ 661 error = ENOEXEC; 662 goto bad; 663#endif 664 665 case PT_INTERP: 666 /* Already did this one */ 667 case PT_DYNAMIC: 668 case PT_NOTE: 669 break; 670 671 case PT_PHDR: 672 /* Note address of program headers (in text segment) */ 673 phdr = pp->p_vaddr; 674 break; 675 676 default: 677 /* 678 * Not fatal; we don't need to understand everything. 679 */ 680 break; 681 } 682 } 683 684 /* this breaks on, e.g., OpenBSD-compatible mips shared binaries. */ 685#ifndef ELF_INTERP_NON_RELOCATABLE 686 /* 687 * If no position to load the interpreter was set by a probe 688 * function, pick the same address that a non-fixed mmap(0, ..) 689 * would (i.e. something safely out of the way). 690 */ 691 if (pos == ELFDEFNNAME(NO_ADDR)) 692 pos = round_page(epp->ep_daddr + MAXDSIZ); 693#endif /* !ELF_INTERP_NON_RELOCATABLE */ 694 695 /* 696 * Check if we found a dynamically linked binary and arrange to load 697 * it's interpreter 698 */ 699 if (interp[0]) { 700 struct elf_args *ap; 701 702 ap = (struct elf_args *)malloc(sizeof(struct elf_args), 703 M_TEMP, M_WAITOK); 704 if ((error = ELFNAME(load_file)(p, epp, interp, 705 &epp->ep_vmcmds, &epp->ep_entry, ap, &pos)) != 0) { 706 free((char *)ap, M_TEMP); 707 goto bad; 708 } 709 pos += phsize; 710 ap->arg_phaddr = phdr; 711 712 ap->arg_phentsize = eh->e_phentsize; 713 ap->arg_phnum = eh->e_phnum; 714 ap->arg_entry = eh->e_entry; 715 716 epp->ep_emul_arg = ap; 717 } else 718 epp->ep_entry = eh->e_entry; 719 720#ifdef ELF_MAP_PAGE_ZERO 721 /* Dell SVR4 maps page zero, yeuch! */ 722 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, NBPG, 0, epp->ep_vp, 0, 723 VM_PROT_READ); 724#endif 725 free((char *)ph, M_TEMP); 726 vn_marktext(epp->ep_vp); 727 return exec_elf_setup_stack(p, epp); 728 729bad: 730 free((char *)ph, M_TEMP); 731 kill_vmcmds(&epp->ep_vmcmds); 732 return ENOEXEC; 733} 734 735int 736ELFNAME2(netbsd,signature)(p, epp, eh) 737 struct proc *p; 738 struct exec_package *epp; 739 Elf_Ehdr *eh; 740{ 741 Elf_Phdr *hph, *ph; 742 Elf_Nhdr *np = NULL; 743 size_t phsize; 744 int error; 745 746 phsize = eh->e_phnum * sizeof(Elf_Phdr); 747 hph = (Elf_Phdr *)malloc(phsize, M_TEMP, M_WAITOK); 748 if ((error = ELFNAME(read_from)(p, epp->ep_vp, eh->e_phoff, 749 (caddr_t)hph, phsize)) != 0) 750 goto out1; 751 752 for (ph = hph; ph < &hph[eh->e_phnum]; ph++) { 753 if (ph->p_type != PT_NOTE || 754 ph->p_filesz < sizeof(Elf_Nhdr) + ELF_NOTE_NETBSD_NAMESZ) 755 continue; 756 757 np = (Elf_Nhdr *)malloc(ph->p_filesz, M_TEMP, M_WAITOK); 758 if ((error = ELFNAME(read_from)(p, epp->ep_vp, ph->p_offset, 759 (caddr_t)np, ph->p_filesz)) != 0) 760 goto out2; 761 762 if (np->n_type != ELF_NOTE_TYPE_OSVERSION) { 763 free(np, M_TEMP); 764 np = NULL; 765 continue; 766 } 767 768 /* Check the name and description sizes. */ 769 if (np->n_namesz != ELF_NOTE_NETBSD_NAMESZ || 770 np->n_descsz != ELF_NOTE_NETBSD_DESCSZ) 771 goto out3; 772 773 /* Is the name "NetBSD\0\0"? */ 774 if (memcmp((np + 1), ELF_NOTE_NETBSD_NAME, 775 ELF_NOTE_NETBSD_NAMESZ)) 776 goto out3; 777 778 /* XXX: We could check for the specific emulation here */ 779 /* All checks succeeded. */ 780 error = 0; 781 goto out2; 782 } 783 784out3: 785 error = ENOEXEC; 786out2: 787 if (np) 788 free(np, M_TEMP); 789out1: 790 free(hph, M_TEMP); 791 return error; 792} 793 794static int 795ELFNAME2(netbsd,probe)(p, epp, eh, itp, pos) 796 struct proc *p; 797 struct exec_package *epp; 798 Elf_Ehdr *eh; 799 char *itp; 800 Elf_Addr *pos; 801{ 802 int error; 803 804 if ((error = ELFNAME2(netbsd,signature)(p, epp, eh)) != 0) 805 return error; 806 epp->ep_emul = &ELFNAMEEND(emul_netbsd); 807 *pos = ELFDEFNNAME(NO_ADDR); 808 return 0; 809} 810