exec_elf32.c revision 1.89
1/* $NetBSD: exec_elf32.c,v 1.89 2003/03/01 05:55:51 matt 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 1.89 2003/03/01 05:55:51 matt 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 struct vattr *vap = pack->ep_vap; 130 131 a->a_type = AT_PHDR; 132 a->a_v = ap->arg_phaddr; 133 a++; 134 135 a->a_type = AT_PHENT; 136 a->a_v = ap->arg_phentsize; 137 a++; 138 139 a->a_type = AT_PHNUM; 140 a->a_v = ap->arg_phnum; 141 a++; 142 143 a->a_type = AT_PAGESZ; 144 a->a_v = PAGE_SIZE; 145 a++; 146 147 a->a_type = AT_BASE; 148 a->a_v = ap->arg_interp; 149 a++; 150 151 a->a_type = AT_FLAGS; 152 a->a_v = 0; 153 a++; 154 155 a->a_type = AT_ENTRY; 156 a->a_v = ap->arg_entry; 157 a++; 158 159 a->a_type = AT_EUID; 160 if (vap->va_mode & S_ISUID) 161 a->a_v = vap->va_uid; 162 else 163 a->a_v = p->p_ucred->cr_uid; 164 a++; 165 166 a->a_type = AT_RUID; 167 a->a_v = p->p_cred->p_ruid; 168 a++; 169 170 a->a_type = AT_EGID; 171 if (vap->va_mode & S_ISGID) 172 a->a_v = vap->va_gid; 173 else 174 a->a_v = p->p_ucred->cr_gid; 175 a++; 176 177 a->a_type = AT_RGID; 178 a->a_v = p->p_cred->p_rgid; 179 a++; 180 181 free(ap, M_TEMP); 182 pack->ep_emul_arg = NULL; 183 } 184 185 a->a_type = AT_NULL; 186 a->a_v = 0; 187 a++; 188 189 len = (a - ai) * sizeof(AuxInfo); 190 if ((error = copyout(ai, *stackp, len)) != 0) 191 return error; 192 *stackp += len; 193 194 return 0; 195} 196 197/* 198 * elf_check_header(): 199 * 200 * Check header for validity; return 0 of ok ENOEXEC if error 201 */ 202int 203ELFNAME(check_header)(Elf_Ehdr *eh, int type) 204{ 205 206 if (memcmp(eh->e_ident, ELFMAG, SELFMAG) != 0 || 207 eh->e_ident[EI_CLASS] != ELFCLASS) 208 return (ENOEXEC); 209 210 switch (eh->e_machine) { 211 212 ELFDEFNNAME(MACHDEP_ID_CASES) 213 214 default: 215 return (ENOEXEC); 216 } 217 218 if (ELF_EHDR_FLAGS_OK(eh) == 0) 219 return (ENOEXEC); 220 221 if (eh->e_type != type) 222 return (ENOEXEC); 223 224 if (eh->e_shnum > 512 || 225 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 */ 236void 237ELFNAME(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 */ 322int 323ELFNAME(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 phsize = eh.e_phnum * sizeof(Elf_Phdr); 393 ph = (Elf_Phdr *)malloc(phsize, M_TEMP, M_WAITOK); 394 395 if ((error = exec_read_from(p, vp, eh.e_phoff, ph, phsize)) != 0) 396 goto bad; 397 398 /* this breaks on, e.g., OpenBSD-compatible mips shared binaries. */ 399#ifndef ELF_INTERP_NON_RELOCATABLE 400 /* 401 * If no position to load the interpreter was set by a probe 402 * function, pick the same address that a non-fixed mmap(0, ..) 403 * would (i.e. something safely out of the way). 404 */ 405 if (*last == ELFDEFNNAME(NO_ADDR)) { 406 u_long limit = 0; 407 /* 408 * Find the start and ending addresses of the psections to 409 * be loaded. This will give us the size. 410 */ 411 for (i = 0, ph0 = ph, base_ph = NULL; i < eh.e_phnum; 412 i++, ph0++) { 413 if (ph0->p_type == PT_LOAD) { 414 u_long psize = ph0->p_vaddr + ph0->p_memsz; 415 if (base_ph == NULL) 416 base_ph = ph0; 417 if (psize > limit) 418 limit = psize; 419 } 420 } 421 422 /* 423 * Now compute the size and load address. 424 */ 425 addr = VM_DEFAULT_ADDRESS(epp->ep_daddr, 426 round_page(limit) - trunc_page(base_ph->p_vaddr)); 427 } else 428#endif /* !ELF_INTERP_NON_RELOCATABLE */ 429 addr = *last; 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 (p->p_vmspace->vm_map.flags & VM_MAP_TOPDOWN) 452 addr = ELF_TRUNC(addr, ph0->p_align); 453 else 454 addr = ELF_ROUND(addr, ph0->p_align); 455 } else { 456 u_long limit = round_page(last_ph->p_vaddr 457 + last_ph->p_memsz); 458 u_long base = trunc_page(ph0->p_vaddr); 459 460 /* 461 * If there is a gap in between the psections, 462 * map it as inaccessible so nothing else 463 * mmap'ed will be placed there. 464 */ 465 if (limit != base) { 466 NEW_VMCMD2(vcset, vmcmd_map_zero, 467 base - limit, 468 limit - base_ph->p_vaddr, NULLVP, 469 0, VM_PROT_NONE, VMCMD_RELATIVE); 470 } 471 472 addr = ph0->p_vaddr - base_ph->p_vaddr; 473 flags = VMCMD_RELATIVE; 474 } 475 last_ph = ph0; 476 ELFNAME(load_psection)(vcset, vp, &ph[i], &addr, 477 &size, &prot, flags); 478 /* 479 * If entry is within this psection then this 480 * must contain the .text section. *entryoff is 481 * relative to the base psection. 482 */ 483 if (eh.e_entry >= ph0->p_vaddr && 484 eh.e_entry < (ph0->p_vaddr + size)) { 485 *entryoff = eh.e_entry - base_ph->p_vaddr; 486 } 487 addr += size; 488 break; 489 } 490 491 case PT_DYNAMIC: 492 case PT_PHDR: 493 case PT_NOTE: 494 break; 495 496 default: 497 break; 498 } 499 } 500 501 free(ph, M_TEMP); 502 /* 503 * This value is ignored if TOPDOWN. 504 */ 505 *last = addr; 506 vrele(vp); 507 return 0; 508 509badunlock: 510 VOP_UNLOCK(vp, 0); 511 512bad: 513 if (ph != NULL) 514 free(ph, M_TEMP); 515#ifdef notyet /* XXX cgd 960926 */ 516 (maybe) VOP_CLOSE it 517#endif 518 vrele(vp); 519 return error; 520} 521 522/* 523 * exec_elf_makecmds(): Prepare an Elf binary's exec package 524 * 525 * First, set of the various offsets/lengths in the exec package. 526 * 527 * Then, mark the text image busy (so it can be demand paged) or error 528 * out if this is not possible. Finally, set up vmcmds for the 529 * text, data, bss, and stack segments. 530 */ 531int 532ELFNAME2(exec,makecmds)(struct proc *p, struct exec_package *epp) 533{ 534 Elf_Ehdr *eh = epp->ep_hdr; 535 Elf_Phdr *ph, *pp; 536 Elf_Addr phdr = 0, pos = 0; 537 int error, i, nload; 538 char *interp = NULL; 539 u_long phsize; 540 541 if (epp->ep_hdrvalid < sizeof(Elf_Ehdr)) 542 return ENOEXEC; 543 544 /* 545 * XXX allow for executing shared objects. It seems silly 546 * but other ELF-based systems allow it as well. 547 */ 548 if (ELFNAME(check_header)(eh, ET_EXEC) != 0 && 549 ELFNAME(check_header)(eh, ET_DYN) != 0) 550 return ENOEXEC; 551 552 error = vn_marktext(epp->ep_vp); 553 if (error) 554 return (error); 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 = exec_read_from(p, epp->ep_vp, eh->e_phoff, ph, phsize)) != 564 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 MALLOC(interp, char *, MAXPATHLEN, M_TEMP, M_WAITOK); 571 interp[0] = '\0'; 572 573 for (i = 0; i < eh->e_phnum; i++) { 574 pp = &ph[i]; 575 if (pp->p_type == PT_INTERP) { 576 if (pp->p_filesz >= MAXPATHLEN) 577 goto bad; 578 if ((error = exec_read_from(p, epp->ep_vp, 579 pp->p_offset, interp, pp->p_filesz)) != 0) 580 goto bad; 581 break; 582 } 583 } 584 585 /* 586 * On the same architecture, we may be emulating different systems. 587 * See which one will accept this executable. This currently only 588 * applies to SVR4, and IBCS2 on the i386 and Linux on the i386 589 * and the Alpha. 590 * 591 * Probe functions would normally see if the interpreter (if any) 592 * exists. Emulation packages may possibly replace the interpreter in 593 * interp[] with a changed path (/emul/xxx/<path>). 594 */ 595 if (!epp->ep_esch->u.elf_probe_func) { 596 pos = ELFDEFNNAME(NO_ADDR); 597 } else { 598 vaddr_t startp = 0; 599 600 error = (*epp->ep_esch->u.elf_probe_func)(p, epp, eh, interp, 601 &startp); 602 pos = (Elf_Addr)startp; 603 if (error) 604 goto bad; 605 } 606 607 /* 608 * Load all the necessary sections 609 */ 610 for (i = nload = 0; i < eh->e_phnum; i++) { 611 Elf_Addr addr = ELFDEFNNAME(NO_ADDR); 612 u_long size = 0; 613 int prot = 0; 614 615 pp = &ph[i]; 616 617 switch (ph[i].p_type) { 618 case PT_LOAD: 619 /* 620 * XXX 621 * Can handle only 2 sections: text and data 622 */ 623 if (nload++ == 2) 624 goto bad; 625 ELFNAME(load_psection)(&epp->ep_vmcmds, epp->ep_vp, 626 &ph[i], &addr, &size, &prot, VMCMD_FIXED); 627 628 /* 629 * Decide whether it's text or data by looking 630 * at the entry point. 631 */ 632 if (eh->e_entry >= addr && 633 eh->e_entry < (addr + size)) { 634 epp->ep_taddr = addr; 635 epp->ep_tsize = size; 636 if (epp->ep_daddr == ELFDEFNNAME(NO_ADDR)) { 637 epp->ep_daddr = addr; 638 epp->ep_dsize = size; 639 } 640 } else { 641 epp->ep_daddr = addr; 642 epp->ep_dsize = size; 643 } 644 break; 645 646 case PT_SHLIB: 647 /* SCO has these sections. */ 648 case PT_INTERP: 649 /* Already did this one. */ 650 case PT_DYNAMIC: 651 case PT_NOTE: 652 break; 653 654 case PT_PHDR: 655 /* Note address of program headers (in text segment) */ 656 phdr = pp->p_vaddr; 657 break; 658 659 default: 660 /* 661 * Not fatal; we don't need to understand everything. 662 */ 663 break; 664 } 665 } 666 667 /* 668 * Check if we found a dynamically linked binary and arrange to load 669 * its interpreter 670 */ 671 if (interp[0]) { 672 struct elf_args *ap; 673 int i = epp->ep_vmcmds.evs_used; 674 u_long interp_offset; 675 676 MALLOC(ap, struct elf_args *, sizeof(struct elf_args), 677 M_TEMP, M_WAITOK); 678 if ((error = ELFNAME(load_file)(p, epp, interp, 679 &epp->ep_vmcmds, &interp_offset, ap, &pos)) != 0) { 680 FREE(ap, M_TEMP); 681 goto bad; 682 } 683 ap->arg_interp = epp->ep_vmcmds.evs_cmds[i].ev_addr; 684 epp->ep_entry = ap->arg_interp + interp_offset; 685 ap->arg_phaddr = phdr; 686 687 ap->arg_phentsize = eh->e_phentsize; 688 ap->arg_phnum = eh->e_phnum; 689 ap->arg_entry = eh->e_entry; 690 691 epp->ep_emul_arg = ap; 692 } else 693 epp->ep_entry = eh->e_entry; 694 695#ifdef ELF_MAP_PAGE_ZERO 696 /* Dell SVR4 maps page zero, yeuch! */ 697 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, PAGE_SIZE, 0, 698 epp->ep_vp, 0, VM_PROT_READ); 699#endif 700 FREE(interp, M_TEMP); 701 free(ph, M_TEMP); 702 return exec_elf_setup_stack(p, epp); 703 704bad: 705 if (interp) 706 FREE(interp, M_TEMP); 707 free(ph, M_TEMP); 708 kill_vmcmds(&epp->ep_vmcmds); 709 return ENOEXEC; 710} 711 712int 713ELFNAME2(netbsd,signature)(struct proc *p, struct exec_package *epp, 714 Elf_Ehdr *eh) 715{ 716 size_t i; 717 Elf_Phdr *ph; 718 size_t phsize; 719 int error; 720 721 phsize = eh->e_phnum * sizeof(Elf_Phdr); 722 ph = (Elf_Phdr *)malloc(phsize, M_TEMP, M_WAITOK); 723 error = exec_read_from(p, epp->ep_vp, eh->e_phoff, ph, phsize); 724 if (error) 725 goto out; 726 727 for (i = 0; i < eh->e_phnum; i++) { 728 Elf_Phdr *ephp = &ph[i]; 729 Elf_Nhdr *np; 730 731 if (ephp->p_type != PT_NOTE || 732 ephp->p_filesz > 1024 || 733 ephp->p_filesz < sizeof(Elf_Nhdr) + ELF_NOTE_NETBSD_NAMESZ) 734 continue; 735 736 np = (Elf_Nhdr *)malloc(ephp->p_filesz, M_TEMP, M_WAITOK); 737 error = exec_read_from(p, epp->ep_vp, ephp->p_offset, np, 738 ephp->p_filesz); 739 if (error) 740 goto next; 741 742 if (np->n_type != ELF_NOTE_TYPE_NETBSD_TAG || 743 np->n_namesz != ELF_NOTE_NETBSD_NAMESZ || 744 np->n_descsz != ELF_NOTE_NETBSD_DESCSZ || 745 memcmp((caddr_t)(np + 1), ELF_NOTE_NETBSD_NAME, 746 ELF_NOTE_NETBSD_NAMESZ)) 747 goto next; 748 749 error = 0; 750 free(np, M_TEMP); 751 goto out; 752 753 next: 754 free(np, M_TEMP); 755 continue; 756 } 757 758 error = ENOEXEC; 759out: 760 free(ph, M_TEMP); 761 return (error); 762} 763 764int 765ELFNAME2(netbsd,probe)(struct proc *p, struct exec_package *epp, 766 void *eh, char *itp, vaddr_t *pos) 767{ 768 int error; 769 770 if ((error = ELFNAME2(netbsd,signature)(p, epp, eh)) != 0) 771 return error; 772 *pos = ELFDEFNNAME(NO_ADDR); 773 return 0; 774} 775