exec_elf32.c revision 1.83
1/* $NetBSD: exec_elf32.c,v 1.83 2003/02/27 01:58:56 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 1.83 2003/02/27 01:58:56 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 uaddr, 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 if (ph->p_align > 1) { 248 *addr = ELF_TRUNC(*addr, ph->p_align); 249 uaddr = ELF_TRUNC(ph->p_vaddr, ph->p_align); 250 } else 251 uaddr = ph->p_vaddr; 252 diff = ph->p_vaddr - uaddr; 253 } else { 254 *addr = uaddr = ph->p_vaddr; 255 if (ph->p_align > 1) 256 *addr = ELF_TRUNC(uaddr, ph->p_align); 257 diff = uaddr - *addr; 258 } 259 260 *prot |= (ph->p_flags & PF_R) ? VM_PROT_READ : 0; 261 *prot |= (ph->p_flags & PF_W) ? VM_PROT_WRITE : 0; 262 *prot |= (ph->p_flags & PF_X) ? VM_PROT_EXECUTE : 0; 263 264 offset = ph->p_offset - diff; 265 *size = ph->p_filesz + diff; 266 msize = ph->p_memsz + diff; 267 268 if (ph->p_align >= PAGE_SIZE) { 269 if ((ph->p_flags & PF_W) != 0) { 270 /* 271 * Because the pagedvn pager can't handle zero fill 272 * of the last data page if it's not page aligned we 273 * map the last page readvn. 274 */ 275 psize = trunc_page(*size); 276 } else { 277 psize = round_page(*size); 278 } 279 } else { 280 psize = *size; 281 } 282 283 if (psize > 0) { 284 NEW_VMCMD2(vcset, ph->p_align < PAGE_SIZE ? 285 vmcmd_map_readvn : vmcmd_map_pagedvn, psize, *addr, vp, 286 offset, *prot, flags); 287 } 288 if (psize < *size) { 289 NEW_VMCMD2(vcset, vmcmd_map_readvn, *size - psize, 290 *addr + psize, vp, offset + psize, *prot, 291 psize > 0 ? flags & VMCMD_RELATIVE : flags); 292 } 293 294 /* 295 * Check if we need to extend the size of the segment 296 */ 297 rm = round_page(*addr + msize); 298 rf = round_page(*addr + *size); 299 300 if (rm != rf) { 301 NEW_VMCMD2(vcset, vmcmd_map_zero, rm - rf, rf, NULLVP, 302 0, *prot, flags & VMCMD_RELATIVE); 303 *size = msize; 304 } 305} 306 307/* 308 * elf_load_file(): 309 * 310 * Load a file (interpreter/library) pointed to by path 311 * [stolen from coff_load_shlib()]. Made slightly generic 312 * so it might be used externally. 313 */ 314int 315ELFNAME(load_file)(struct proc *p, struct exec_package *epp, char *path, 316 struct exec_vmcmd_set *vcset, u_long *entryoff, struct elf_args *ap, 317 Elf_Addr *last) 318{ 319 int error, i; 320 struct nameidata nd; 321 struct vnode *vp; 322 struct vattr attr; 323 Elf_Ehdr eh; 324 Elf_Phdr *ph = NULL; 325 const Elf_Phdr *ph0; 326 const Elf_Phdr *base_ph; 327 const Elf_Phdr *last_ph; 328 u_long phsize; 329 Elf_Addr addr = *last; 330 331 /* 332 * 1. open file 333 * 2. read filehdr 334 * 3. map text, data, and bss out of it using VM_* 335 */ 336 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, path, p); 337 if ((error = namei(&nd)) != 0) 338 return error; 339 vp = nd.ni_vp; 340 341 /* 342 * Similarly, if it's not marked as executable, or it's not a regular 343 * file, we don't allow it to be used. 344 */ 345 if (vp->v_type != VREG) { 346 error = EACCES; 347 goto badunlock; 348 } 349 if ((error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p)) != 0) 350 goto badunlock; 351 352 /* get attributes */ 353 if ((error = VOP_GETATTR(vp, &attr, p->p_ucred, p)) != 0) 354 goto badunlock; 355 356 /* 357 * Check mount point. Though we're not trying to exec this binary, 358 * we will be executing code from it, so if the mount point 359 * disallows execution or set-id-ness, we punt or kill the set-id. 360 */ 361 if (vp->v_mount->mnt_flag & MNT_NOEXEC) { 362 error = EACCES; 363 goto badunlock; 364 } 365 if (vp->v_mount->mnt_flag & MNT_NOSUID) 366 epp->ep_vap->va_mode &= ~(S_ISUID | S_ISGID); 367 368#ifdef notyet /* XXX cgd 960926 */ 369 XXX cgd 960926: (maybe) VOP_OPEN it (and VOP_CLOSE in copyargs?) 370#endif 371 372 error = vn_marktext(vp); 373 if (error) 374 goto badunlock; 375 376 VOP_UNLOCK(vp, 0); 377 378 if ((error = exec_read_from(p, vp, 0, &eh, sizeof(eh))) != 0) 379 goto bad; 380 381 if ((error = ELFNAME(check_header)(&eh, ET_DYN)) != 0) 382 goto bad; 383 384 phsize = eh.e_phnum * sizeof(Elf_Phdr); 385 ph = (Elf_Phdr *)malloc(phsize, M_TEMP, M_WAITOK); 386 387 if ((error = exec_read_from(p, vp, eh.e_phoff, ph, phsize)) != 0) 388 goto bad; 389 390 /* this breaks on, e.g., OpenBSD-compatible mips shared binaries. */ 391#ifndef ELF_INTERP_NON_RELOCATABLE 392 /* 393 * If no position to load the interpreter was set by a probe 394 * function, pick the same address that a non-fixed mmap(0, ..) 395 * would (i.e. something safely out of the way). 396 */ 397 if (*last == ELFDEFNNAME(NO_ADDR)) { 398 u_long limit = 0; 399 /* 400 * Find the start and ending addresses of the psections to 401 * be loaded. This will give us the size. 402 */ 403 for (i = 0, ph0 = ph, base_ph = NULL; i < eh.e_phnum; 404 i++, ph0++) { 405 if (ph0->p_type == PT_LOAD) { 406 u_long psize = ph0->p_vaddr + ph0->p_memsz; 407 if (base_ph == NULL) 408 base_ph = ph0; 409 if (psize > limit) 410 limit = psize; 411 } 412 } 413 414 /* 415 * Now compute the size and load address. 416 */ 417 addr = VM_DEFAULT_ADDRESS(epp->ep_daddr, 418 round_page(limit) - trunc_page(base_ph->p_vaddr)); 419 } else 420#endif /* !ELF_INTERP_NON_RELOCATABLE */ 421 addr = *last; 422 423 /* 424 * Load all the necessary sections 425 */ 426 for (i = 0, ph0 = ph, base_ph = NULL, last_ph = NULL; 427 i < eh.e_phnum; i++, ph0++) { 428 switch (ph0->p_type) { 429 case PT_LOAD: { 430 u_long size; 431 int prot = 0; 432 int flags; 433 434 if (base_ph == NULL) { 435 /* 436 * First encountered psection is always the 437 * base psection. 438 */ 439 base_ph = ph0; 440 flags = VMCMD_BASE; 441 } else { 442 u_long limit = round_page(last_ph->p_vaddr 443 + last_ph->p_memsz); 444 445 /* 446 * If there is a gap in between the psections, 447 * map it as inaccessible so nothing else 448 * mmap'ed will be placed there. 449 */ 450 if (limit != trunc_page(ph0->p_vaddr)) { 451 NEW_VMCMD2(vcset, vmcmd_map_zero, 452 trunc_page(ph0->p_vaddr) - limit, 453 limit - base_ph->p_vaddr, 454 NULLVP, 0, 0, VMCMD_RELATIVE); 455 } 456 457 addr = ph0->p_vaddr - base_ph->p_vaddr; 458 flags = VMCMD_RELATIVE; 459 } 460 last_ph = ph0; 461 ELFNAME(load_psection)(vcset, vp, &ph[i], &addr, 462 &size, &prot, flags); 463 /* 464 * If entry is within this psection then this 465 * must contain the .text section. *entryoff is 466 * relative to the base psection. 467 */ 468 if (eh.e_entry >= ph0->p_vaddr && 469 eh.e_entry < (ph0->p_vaddr + size)) { 470 *entryoff = eh.e_entry - base_ph->p_vaddr; 471 } 472 /* 473 * This value is ignored if TOPDOWN. 474 */ 475 if (ph0->p_vaddr != 0) 476 addr += size; 477 break; 478 } 479 480 case PT_DYNAMIC: 481 case PT_PHDR: 482 case PT_NOTE: 483 break; 484 485 default: 486 break; 487 } 488 } 489 490 free(ph, M_TEMP); 491 /* 492 * This value is ignored if TOPDOWN. 493 */ 494 *last = addr; 495 vrele(vp); 496 return 0; 497 498badunlock: 499 VOP_UNLOCK(vp, 0); 500 501bad: 502 if (ph != NULL) 503 free(ph, M_TEMP); 504#ifdef notyet /* XXX cgd 960926 */ 505 (maybe) VOP_CLOSE it 506#endif 507 vrele(vp); 508 return error; 509} 510 511/* 512 * exec_elf_makecmds(): Prepare an Elf binary's exec package 513 * 514 * First, set of the various offsets/lengths in the exec package. 515 * 516 * Then, mark the text image busy (so it can be demand paged) or error 517 * out if this is not possible. Finally, set up vmcmds for the 518 * text, data, bss, and stack segments. 519 */ 520int 521ELFNAME2(exec,makecmds)(struct proc *p, struct exec_package *epp) 522{ 523 Elf_Ehdr *eh = epp->ep_hdr; 524 Elf_Phdr *ph, *pp; 525 Elf_Addr phdr = 0, pos = 0; 526 int error, i, nload; 527 char *interp = NULL; 528 u_long phsize; 529 530 if (epp->ep_hdrvalid < sizeof(Elf_Ehdr)) 531 return ENOEXEC; 532 533 /* 534 * XXX allow for executing shared objects. It seems silly 535 * but other ELF-based systems allow it as well. 536 */ 537 if (ELFNAME(check_header)(eh, ET_EXEC) != 0 && 538 ELFNAME(check_header)(eh, ET_DYN) != 0) 539 return ENOEXEC; 540 541 error = vn_marktext(epp->ep_vp); 542 if (error) 543 return (error); 544 545 /* 546 * Allocate space to hold all the program headers, and read them 547 * from the file 548 */ 549 phsize = eh->e_phnum * sizeof(Elf_Phdr); 550 ph = (Elf_Phdr *)malloc(phsize, M_TEMP, M_WAITOK); 551 552 if ((error = exec_read_from(p, epp->ep_vp, eh->e_phoff, ph, phsize)) != 553 0) 554 goto bad; 555 556 epp->ep_taddr = epp->ep_tsize = ELFDEFNNAME(NO_ADDR); 557 epp->ep_daddr = epp->ep_dsize = ELFDEFNNAME(NO_ADDR); 558 559 MALLOC(interp, char *, MAXPATHLEN, M_TEMP, M_WAITOK); 560 interp[0] = '\0'; 561 562 for (i = 0; i < eh->e_phnum; i++) { 563 pp = &ph[i]; 564 if (pp->p_type == PT_INTERP) { 565 if (pp->p_filesz >= MAXPATHLEN) 566 goto bad; 567 if ((error = exec_read_from(p, epp->ep_vp, 568 pp->p_offset, interp, pp->p_filesz)) != 0) 569 goto bad; 570 break; 571 } 572 } 573 574 /* 575 * On the same architecture, we may be emulating different systems. 576 * See which one will accept this executable. This currently only 577 * applies to SVR4, and IBCS2 on the i386 and Linux on the i386 578 * and the Alpha. 579 * 580 * Probe functions would normally see if the interpreter (if any) 581 * exists. Emulation packages may possibly replace the interpreter in 582 * interp[] with a changed path (/emul/xxx/<path>). 583 */ 584 if (!epp->ep_esch->u.elf_probe_func) { 585 pos = ELFDEFNNAME(NO_ADDR); 586 } else { 587 vaddr_t startp = 0; 588 589 error = (*epp->ep_esch->u.elf_probe_func)(p, epp, eh, interp, 590 &startp); 591 pos = (Elf_Addr)startp; 592 if (error) 593 goto bad; 594 } 595 596 /* 597 * Load all the necessary sections 598 */ 599 for (i = nload = 0; i < eh->e_phnum; i++) { 600 Elf_Addr addr = ELFDEFNNAME(NO_ADDR); 601 u_long size = 0; 602 int prot = 0; 603 604 pp = &ph[i]; 605 606 switch (ph[i].p_type) { 607 case PT_LOAD: 608 /* 609 * XXX 610 * Can handle only 2 sections: text and data 611 */ 612 if (nload++ == 2) 613 goto bad; 614 ELFNAME(load_psection)(&epp->ep_vmcmds, epp->ep_vp, 615 &ph[i], &addr, &size, &prot, VMCMD_FIXED); 616 617 /* 618 * Decide whether it's text or data by looking 619 * at the entry point. 620 */ 621 if (eh->e_entry >= addr && 622 eh->e_entry < (addr + size)) { 623 epp->ep_taddr = addr; 624 epp->ep_tsize = size; 625 if (epp->ep_daddr == ELFDEFNNAME(NO_ADDR)) { 626 epp->ep_daddr = addr; 627 epp->ep_dsize = size; 628 } 629 } else { 630 epp->ep_daddr = addr; 631 epp->ep_dsize = size; 632 } 633 break; 634 635 case PT_SHLIB: 636 /* SCO has these sections. */ 637 case PT_INTERP: 638 /* Already did this one. */ 639 case PT_DYNAMIC: 640 case PT_NOTE: 641 break; 642 643 case PT_PHDR: 644 /* Note address of program headers (in text segment) */ 645 phdr = pp->p_vaddr; 646 break; 647 648 default: 649 /* 650 * Not fatal; we don't need to understand everything. 651 */ 652 break; 653 } 654 } 655 656 /* 657 * Check if we found a dynamically linked binary and arrange to load 658 * its interpreter 659 */ 660 if (interp[0]) { 661 struct elf_args *ap; 662 int i = epp->ep_vmcmds.evs_used; 663 u_long interp_offset; 664 665 MALLOC(ap, struct elf_args *, sizeof(struct elf_args), 666 M_TEMP, M_WAITOK); 667 if ((error = ELFNAME(load_file)(p, epp, interp, 668 &epp->ep_vmcmds, &interp_offset, ap, &pos)) != 0) { 669 FREE(ap, M_TEMP); 670 goto bad; 671 } 672 ap->arg_interp = epp->ep_vmcmds.evs_cmds[i].ev_addr; 673 epp->ep_entry = ap->arg_interp + interp_offset; 674 ap->arg_phaddr = phdr; 675 676 ap->arg_phentsize = eh->e_phentsize; 677 ap->arg_phnum = eh->e_phnum; 678 ap->arg_entry = eh->e_entry; 679 680 epp->ep_emul_arg = ap; 681 } else 682 epp->ep_entry = eh->e_entry; 683 684#ifdef ELF_MAP_PAGE_ZERO 685 /* Dell SVR4 maps page zero, yeuch! */ 686 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, PAGE_SIZE, 0, 687 epp->ep_vp, 0, VM_PROT_READ); 688#endif 689 FREE(interp, M_TEMP); 690 free(ph, M_TEMP); 691 return exec_elf_setup_stack(p, epp); 692 693bad: 694 if (interp) 695 FREE(interp, M_TEMP); 696 free(ph, M_TEMP); 697 kill_vmcmds(&epp->ep_vmcmds); 698 return ENOEXEC; 699} 700 701int 702ELFNAME2(netbsd,signature)(struct proc *p, struct exec_package *epp, 703 Elf_Ehdr *eh) 704{ 705 size_t i; 706 Elf_Phdr *ph; 707 size_t phsize; 708 int error; 709 710 phsize = eh->e_phnum * sizeof(Elf_Phdr); 711 ph = (Elf_Phdr *)malloc(phsize, M_TEMP, M_WAITOK); 712 error = exec_read_from(p, epp->ep_vp, eh->e_phoff, ph, phsize); 713 if (error) 714 goto out; 715 716 for (i = 0; i < eh->e_phnum; i++) { 717 Elf_Phdr *ephp = &ph[i]; 718 Elf_Nhdr *np; 719 720 if (ephp->p_type != PT_NOTE || 721 ephp->p_filesz > 1024 || 722 ephp->p_filesz < sizeof(Elf_Nhdr) + ELF_NOTE_NETBSD_NAMESZ) 723 continue; 724 725 np = (Elf_Nhdr *)malloc(ephp->p_filesz, M_TEMP, M_WAITOK); 726 error = exec_read_from(p, epp->ep_vp, ephp->p_offset, np, 727 ephp->p_filesz); 728 if (error) 729 goto next; 730 731 if (np->n_type != ELF_NOTE_TYPE_NETBSD_TAG || 732 np->n_namesz != ELF_NOTE_NETBSD_NAMESZ || 733 np->n_descsz != ELF_NOTE_NETBSD_DESCSZ || 734 memcmp((caddr_t)(np + 1), ELF_NOTE_NETBSD_NAME, 735 ELF_NOTE_NETBSD_NAMESZ)) 736 goto next; 737 738 error = 0; 739 free(np, M_TEMP); 740 goto out; 741 742 next: 743 free(np, M_TEMP); 744 continue; 745 } 746 747 error = ENOEXEC; 748out: 749 free(ph, M_TEMP); 750 return (error); 751} 752 753int 754ELFNAME2(netbsd,probe)(struct proc *p, struct exec_package *epp, 755 void *eh, char *itp, vaddr_t *pos) 756{ 757 int error; 758 759 if ((error = ELFNAME2(netbsd,signature)(p, epp, eh)) != 0) 760 return error; 761 *pos = ELFDEFNNAME(NO_ADDR); 762 return 0; 763} 764