Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/kern/exec_elf32.c
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1 /* $NetBSD: exec_elf32.c,v 1.97.2.2 2006/03/20 17:52:29 riz 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 1.97.2.2 2006/03/20 17:52:29 riz 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 89 extern const struct emul emul_netbsd; 90 91 int ELFNAME(load_file)(struct proc *, struct exec_package *, char *, 92 struct exec_vmcmd_set *, u_long *, struct elf_args *, Elf_Addr *); 93 void ELFNAME(load_psection)(struct exec_vmcmd_set *, struct vnode *, 94 const Elf_Phdr *, Elf_Addr *, u_long *, int *, int); 95 96 int ELFNAME2(netbsd,signature)(struct proc *, struct exec_package *, 97 Elf_Ehdr *); 98 int ELFNAME2(netbsd,probe)(struct proc *, struct exec_package *, 99 void *, char *, vaddr_t *); 100 101 /* round up and down to page boundaries. */ 102 #define ELF_ROUND(a, b) (((a) + (b) - 1) & ~((b) - 1)) 103 #define ELF_TRUNC(a, b) ((a) & ~((b) - 1)) 104 105 #define MAXPHNUM 50 106 107 /* 108 * Copy arguments onto the stack in the normal way, but add some 109 * extra information in case of dynamic binding. 110 */ 111 int 112 ELFNAME(copyargs)(struct proc *p, struct exec_package *pack, 113 struct ps_strings *arginfo, char **stackp, void *argp) 114 { 115 size_t len; 116 AuxInfo ai[ELF_AUX_ENTRIES], *a; 117 struct elf_args *ap; 118 int error; 119 120 if ((error = copyargs(p, pack, arginfo, stackp, argp)) != 0) 121 return error; 122 123 a = ai; 124 125 /* 126 * Push extra arguments on the stack needed by dynamically 127 * linked binaries 128 */ 129 if ((ap = (struct elf_args *)pack->ep_emul_arg)) { 130 struct vattr *vap = pack->ep_vap; 131 132 a->a_type = AT_PHDR; 133 a->a_v = ap->arg_phaddr; 134 a++; 135 136 a->a_type = AT_PHENT; 137 a->a_v = ap->arg_phentsize; 138 a++; 139 140 a->a_type = AT_PHNUM; 141 a->a_v = ap->arg_phnum; 142 a++; 143 144 a->a_type = AT_PAGESZ; 145 a->a_v = PAGE_SIZE; 146 a++; 147 148 a->a_type = AT_BASE; 149 a->a_v = ap->arg_interp; 150 a++; 151 152 a->a_type = AT_FLAGS; 153 a->a_v = 0; 154 a++; 155 156 a->a_type = AT_ENTRY; 157 a->a_v = ap->arg_entry; 158 a++; 159 160 a->a_type = AT_EUID; 161 if (vap->va_mode & S_ISUID) 162 a->a_v = vap->va_uid; 163 else 164 a->a_v = p->p_ucred->cr_uid; 165 a++; 166 167 a->a_type = AT_RUID; 168 a->a_v = p->p_cred->p_ruid; 169 a++; 170 171 a->a_type = AT_EGID; 172 if (vap->va_mode & S_ISGID) 173 a->a_v = vap->va_gid; 174 else 175 a->a_v = p->p_ucred->cr_gid; 176 a++; 177 178 a->a_type = AT_RGID; 179 a->a_v = p->p_cred->p_rgid; 180 a++; 181 182 free(ap, M_TEMP); 183 pack->ep_emul_arg = NULL; 184 } 185 186 a->a_type = AT_NULL; 187 a->a_v = 0; 188 a++; 189 190 len = (a - ai) * sizeof(AuxInfo); 191 if ((error = copyout(ai, *stackp, len)) != 0) 192 return error; 193 *stackp += len; 194 195 return 0; 196 } 197 198 /* 199 * elf_check_header(): 200 * 201 * Check header for validity; return 0 of ok ENOEXEC if error 202 */ 203 int 204 ELFNAME(check_header)(Elf_Ehdr *eh, int type) 205 { 206 207 if (memcmp(eh->e_ident, ELFMAG, SELFMAG) != 0 || 208 eh->e_ident[EI_CLASS] != ELFCLASS) 209 return (ENOEXEC); 210 211 switch (eh->e_machine) { 212 213 ELFDEFNNAME(MACHDEP_ID_CASES) 214 215 default: 216 return (ENOEXEC); 217 } 218 219 if (ELF_EHDR_FLAGS_OK(eh) == 0) 220 return (ENOEXEC); 221 222 if (eh->e_type != type) 223 return (ENOEXEC); 224 225 if (eh->e_shnum > 1024 || 226 eh->e_phnum > 128) 227 return (ENOEXEC); 228 229 return (0); 230 } 231 232 /* 233 * elf_load_psection(): 234 * 235 * Load a psection at the appropriate address 236 */ 237 void 238 ELFNAME(load_psection)(struct exec_vmcmd_set *vcset, struct vnode *vp, 239 const Elf_Phdr *ph, Elf_Addr *addr, u_long *size, int *prot, int flags) 240 { 241 u_long msize, psize, rm, rf; 242 long diff, offset; 243 244 /* 245 * If the user specified an address, then we load there. 246 */ 247 if (*addr == ELFDEFNNAME(NO_ADDR)) 248 *addr = ph->p_vaddr; 249 250 if (ph->p_align > 1) { 251 /* 252 * Make sure we are virtually aligned as we are supposed to be. 253 */ 254 diff = ph->p_vaddr - ELF_TRUNC(ph->p_vaddr, ph->p_align); 255 KASSERT(*addr - diff == ELF_TRUNC(*addr, ph->p_align)); 256 /* 257 * But make sure to not map any pages before the start of the 258 * psection by limiting the difference to within a page. 259 */ 260 diff &= PAGE_MASK; 261 } else 262 diff = 0; 263 264 *prot |= (ph->p_flags & PF_R) ? VM_PROT_READ : 0; 265 *prot |= (ph->p_flags & PF_W) ? VM_PROT_WRITE : 0; 266 *prot |= (ph->p_flags & PF_X) ? VM_PROT_EXECUTE : 0; 267 268 /* 269 * Adjust everything so it all starts on a page boundary. 270 */ 271 *addr -= diff; 272 offset = ph->p_offset - diff; 273 *size = ph->p_filesz + diff; 274 msize = ph->p_memsz + diff; 275 276 if (ph->p_align >= PAGE_SIZE) { 277 if ((ph->p_flags & PF_W) != 0) { 278 /* 279 * Because the pagedvn pager can't handle zero fill 280 * of the last data page if it's not page aligned we 281 * map the last page readvn. 282 */ 283 psize = trunc_page(*size); 284 } else { 285 psize = round_page(*size); 286 } 287 } else { 288 psize = *size; 289 } 290 291 if (psize > 0) { 292 NEW_VMCMD2(vcset, ph->p_align < PAGE_SIZE ? 293 vmcmd_map_readvn : vmcmd_map_pagedvn, psize, *addr, vp, 294 offset, *prot, flags); 295 flags &= VMCMD_RELATIVE; 296 } 297 if (psize < *size) { 298 NEW_VMCMD2(vcset, vmcmd_map_readvn, *size - psize, 299 *addr + psize, vp, offset + psize, *prot, flags); 300 } 301 302 /* 303 * Check if we need to extend the size of the segment (does 304 * bss extend page the next page boundary)? 305 */ 306 rm = round_page(*addr + msize); 307 rf = round_page(*addr + *size); 308 309 if (rm != rf) { 310 NEW_VMCMD2(vcset, vmcmd_map_zero, rm - rf, rf, NULLVP, 311 0, *prot, flags & VMCMD_RELATIVE); 312 *size = msize; 313 } 314 } 315 316 /* 317 * elf_load_file(): 318 * 319 * Load a file (interpreter/library) pointed to by path 320 * [stolen from coff_load_shlib()]. Made slightly generic 321 * so it might be used externally. 322 */ 323 int 324 ELFNAME(load_file)(struct proc *p, struct exec_package *epp, char *path, 325 struct exec_vmcmd_set *vcset, u_long *entryoff, struct elf_args *ap, 326 Elf_Addr *last) 327 { 328 int error, i; 329 struct nameidata nd; 330 struct vnode *vp; 331 struct vattr attr; 332 Elf_Ehdr eh; 333 Elf_Phdr *ph = NULL; 334 const Elf_Phdr *ph0; 335 const Elf_Phdr *base_ph; 336 const Elf_Phdr *last_ph; 337 u_long phsize; 338 Elf_Addr addr = *last; 339 340 /* 341 * 1. open file 342 * 2. read filehdr 343 * 3. map text, data, and bss out of it using VM_* 344 */ 345 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, path, p); 346 if ((error = namei(&nd)) != 0) 347 return error; 348 vp = nd.ni_vp; 349 350 /* 351 * Similarly, if it's not marked as executable, or it's not a regular 352 * file, we don't allow it to be used. 353 */ 354 if (vp->v_type != VREG) { 355 error = EACCES; 356 goto badunlock; 357 } 358 if ((error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p)) != 0) 359 goto badunlock; 360 361 /* get attributes */ 362 if ((error = VOP_GETATTR(vp, &attr, p->p_ucred, p)) != 0) 363 goto badunlock; 364 365 /* 366 * Check mount point. Though we're not trying to exec this binary, 367 * we will be executing code from it, so if the mount point 368 * disallows execution or set-id-ness, we punt or kill the set-id. 369 */ 370 if (vp->v_mount->mnt_flag & MNT_NOEXEC) { 371 error = EACCES; 372 goto badunlock; 373 } 374 if (vp->v_mount->mnt_flag & MNT_NOSUID) 375 epp->ep_vap->va_mode &= ~(S_ISUID | S_ISGID); 376 377 #ifdef notyet /* XXX cgd 960926 */ 378 XXX cgd 960926: (maybe) VOP_OPEN it (and VOP_CLOSE in copyargs?) 379 #endif 380 381 error = vn_marktext(vp); 382 if (error) 383 goto badunlock; 384 385 VOP_UNLOCK(vp, 0); 386 387 if ((error = exec_read_from(p, vp, 0, &eh, sizeof(eh))) != 0) 388 goto bad; 389 390 if ((error = ELFNAME(check_header)(&eh, ET_DYN)) != 0) 391 goto bad; 392 393 if (eh.e_phnum > MAXPHNUM) 394 goto bad; 395 396 phsize = eh.e_phnum * sizeof(Elf_Phdr); 397 ph = (Elf_Phdr *)malloc(phsize, M_TEMP, M_WAITOK); 398 399 if ((error = exec_read_from(p, vp, eh.e_phoff, ph, phsize)) != 0) 400 goto bad; 401 402 /* 403 * If no position to load the interpreter was set by a probe 404 * function, pick the same address that a non-fixed mmap(0, ..) 405 * would (i.e. something safely out of the way). 406 */ 407 if (*last == ELFDEFNNAME(NO_ADDR)) { 408 u_long limit = 0; 409 /* 410 * Find the start and ending addresses of the psections to 411 * be loaded. This will give us the size. 412 */ 413 for (i = 0, ph0 = ph, base_ph = NULL; i < eh.e_phnum; 414 i++, ph0++) { 415 if (ph0->p_type == PT_LOAD) { 416 u_long psize = ph0->p_vaddr + ph0->p_memsz; 417 if (base_ph == NULL) 418 base_ph = ph0; 419 if (psize > limit) 420 limit = psize; 421 } 422 } 423 424 if (base_ph == NULL) { 425 error = ENOEXEC; 426 goto bad; 427 } 428 429 /* 430 * Now compute the size and load address. 431 */ 432 addr = VM_DEFAULT_ADDRESS(epp->ep_daddr, 433 round_page(limit) - trunc_page(base_ph->p_vaddr)); 434 } else 435 addr = *last; /* may be ELF_LINK_ADDR */ 436 437 /* 438 * Load all the necessary sections 439 */ 440 for (i = 0, ph0 = ph, base_ph = NULL, last_ph = NULL; 441 i < eh.e_phnum; i++, ph0++) { 442 switch (ph0->p_type) { 443 case PT_LOAD: { 444 u_long size; 445 int prot = 0; 446 int flags; 447 448 if (base_ph == NULL) { 449 /* 450 * First encountered psection is always the 451 * base psection. Make sure it's aligned 452 * properly (align down for topdown and align 453 * upwards for not topdown). 454 */ 455 base_ph = ph0; 456 flags = VMCMD_BASE; 457 if (addr == ELF_LINK_ADDR) 458 addr = ph0->p_vaddr; 459 if (p->p_vmspace->vm_map.flags & VM_MAP_TOPDOWN) 460 addr = ELF_TRUNC(addr, ph0->p_align); 461 else 462 addr = ELF_ROUND(addr, ph0->p_align); 463 } else { 464 u_long limit = round_page(last_ph->p_vaddr 465 + last_ph->p_memsz); 466 u_long base = trunc_page(ph0->p_vaddr); 467 468 /* 469 * If there is a gap in between the psections, 470 * map it as inaccessible so nothing else 471 * mmap'ed will be placed there. 472 */ 473 if (limit != base) { 474 NEW_VMCMD2(vcset, vmcmd_map_zero, 475 base - limit, 476 limit - base_ph->p_vaddr, NULLVP, 477 0, VM_PROT_NONE, VMCMD_RELATIVE); 478 } 479 480 addr = ph0->p_vaddr - base_ph->p_vaddr; 481 flags = VMCMD_RELATIVE; 482 } 483 last_ph = ph0; 484 ELFNAME(load_psection)(vcset, vp, &ph[i], &addr, 485 &size, &prot, flags); 486 /* 487 * If entry is within this psection then this 488 * must contain the .text section. *entryoff is 489 * relative to the base psection. 490 */ 491 if (eh.e_entry >= ph0->p_vaddr && 492 eh.e_entry < (ph0->p_vaddr + size)) { 493 *entryoff = eh.e_entry - base_ph->p_vaddr; 494 } 495 addr += size; 496 break; 497 } 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(ph, M_TEMP); 510 /* 511 * This value is ignored if TOPDOWN. 512 */ 513 *last = addr; 514 vrele(vp); 515 return 0; 516 517 badunlock: 518 VOP_UNLOCK(vp, 0); 519 520 bad: 521 if (ph != NULL) 522 free(ph, M_TEMP); 523 #ifdef notyet /* XXX cgd 960926 */ 524 (maybe) VOP_CLOSE it 525 #endif 526 vrele(vp); 527 return error; 528 } 529 530 /* 531 * exec_elf_makecmds(): Prepare an Elf binary's exec package 532 * 533 * First, set of the various offsets/lengths in the exec package. 534 * 535 * Then, mark the text image busy (so it can be demand paged) or error 536 * out if this is not possible. Finally, set up vmcmds for the 537 * text, data, bss, and stack segments. 538 */ 539 int 540 ELFNAME2(exec,makecmds)(struct proc *p, struct exec_package *epp) 541 { 542 Elf_Ehdr *eh = epp->ep_hdr; 543 Elf_Phdr *ph, *pp; 544 Elf_Addr phdr = 0, pos = 0; 545 int error, i, nload; 546 char *interp = NULL; 547 u_long phsize; 548 549 if (epp->ep_hdrvalid < sizeof(Elf_Ehdr)) 550 return ENOEXEC; 551 552 /* 553 * XXX allow for executing shared objects. It seems silly 554 * but other ELF-based systems allow it as well. 555 */ 556 if (ELFNAME(check_header)(eh, ET_EXEC) != 0 && 557 ELFNAME(check_header)(eh, ET_DYN) != 0) 558 return ENOEXEC; 559 560 if (eh->e_phnum > MAXPHNUM) 561 return ENOEXEC; 562 563 error = vn_marktext(epp->ep_vp); 564 if (error) 565 return (error); 566 567 /* 568 * Allocate space to hold all the program headers, and read them 569 * from the file 570 */ 571 phsize = eh->e_phnum * sizeof(Elf_Phdr); 572 ph = (Elf_Phdr *)malloc(phsize, M_TEMP, M_WAITOK); 573 574 if ((error = exec_read_from(p, epp->ep_vp, eh->e_phoff, ph, phsize)) != 575 0) 576 goto bad; 577 578 epp->ep_taddr = epp->ep_tsize = ELFDEFNNAME(NO_ADDR); 579 epp->ep_daddr = epp->ep_dsize = ELFDEFNNAME(NO_ADDR); 580 581 for (i = 0; i < eh->e_phnum; i++) { 582 pp = &ph[i]; 583 if (pp->p_type == PT_INTERP) { 584 if (pp->p_filesz >= MAXPATHLEN) 585 goto bad; 586 MALLOC(interp, char *, MAXPATHLEN, M_TEMP, M_WAITOK); 587 interp[0] = '\0'; 588 if ((error = exec_read_from(p, epp->ep_vp, 589 pp->p_offset, interp, pp->p_filesz)) != 0) 590 goto bad; 591 break; 592 } 593 } 594 595 /* 596 * On the same architecture, we may be emulating different systems. 597 * See which one will accept this executable. This currently only 598 * applies to SVR4, and IBCS2 on the i386 and Linux on the i386 599 * and the Alpha. 600 * 601 * Probe functions would normally see if the interpreter (if any) 602 * exists. Emulation packages may possibly replace the interpreter in 603 * interp[] with a changed path (/emul/xxx/<path>). 604 */ 605 pos = ELFDEFNNAME(NO_ADDR); 606 if (epp->ep_esch->u.elf_probe_func) { 607 vaddr_t startp = (vaddr_t)pos; 608 609 error = (*epp->ep_esch->u.elf_probe_func)(p, epp, eh, interp, 610 &startp); 611 if (error) 612 goto bad; 613 pos = (Elf_Addr)startp; 614 } 615 616 /* 617 * Load all the necessary sections 618 */ 619 for (i = nload = 0; i < eh->e_phnum; i++) { 620 Elf_Addr addr = ELFDEFNNAME(NO_ADDR); 621 u_long size = 0; 622 int prot = 0; 623 624 pp = &ph[i]; 625 626 switch (ph[i].p_type) { 627 case PT_LOAD: 628 /* 629 * XXX 630 * Can handle only 2 sections: text and data 631 */ 632 if (nload++ == 2) 633 goto bad; 634 ELFNAME(load_psection)(&epp->ep_vmcmds, epp->ep_vp, 635 &ph[i], &addr, &size, &prot, VMCMD_FIXED); 636 637 /* 638 * Decide whether it's text or data by looking 639 * at the entry point. 640 */ 641 if (eh->e_entry >= addr && 642 eh->e_entry < (addr + size)) { 643 epp->ep_taddr = addr; 644 epp->ep_tsize = size; 645 if (epp->ep_daddr == ELFDEFNNAME(NO_ADDR)) { 646 epp->ep_daddr = addr; 647 epp->ep_dsize = size; 648 } 649 } else { 650 epp->ep_daddr = addr; 651 epp->ep_dsize = size; 652 } 653 break; 654 655 case PT_SHLIB: 656 /* SCO has these sections. */ 657 case PT_INTERP: 658 /* Already did this one. */ 659 case PT_DYNAMIC: 660 case PT_NOTE: 661 break; 662 663 case PT_PHDR: 664 /* Note address of program headers (in text segment) */ 665 phdr = pp->p_vaddr; 666 break; 667 668 default: 669 /* 670 * Not fatal; we don't need to understand everything. 671 */ 672 break; 673 } 674 } 675 676 /* 677 * Check if we found a dynamically linked binary and arrange to load 678 * its interpreter 679 */ 680 if (interp) { 681 struct elf_args *ap; 682 int i = epp->ep_vmcmds.evs_used; 683 u_long interp_offset; 684 685 MALLOC(ap, struct elf_args *, sizeof(struct elf_args), 686 M_TEMP, M_WAITOK); 687 if ((error = ELFNAME(load_file)(p, epp, interp, 688 &epp->ep_vmcmds, &interp_offset, ap, &pos)) != 0) { 689 FREE(ap, M_TEMP); 690 goto bad; 691 } 692 ap->arg_interp = epp->ep_vmcmds.evs_cmds[i].ev_addr; 693 epp->ep_entry = ap->arg_interp + interp_offset; 694 ap->arg_phaddr = phdr; 695 696 ap->arg_phentsize = eh->e_phentsize; 697 ap->arg_phnum = eh->e_phnum; 698 ap->arg_entry = eh->e_entry; 699 700 epp->ep_emul_arg = ap; 701 702 FREE(interp, M_TEMP); 703 } else 704 epp->ep_entry = eh->e_entry; 705 706 #ifdef ELF_MAP_PAGE_ZERO 707 /* Dell SVR4 maps page zero, yeuch! */ 708 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, PAGE_SIZE, 0, 709 epp->ep_vp, 0, VM_PROT_READ); 710 #endif 711 free(ph, M_TEMP); 712 return (*epp->ep_esch->es_setup_stack)(p, epp); 713 714 bad: 715 if (interp) 716 FREE(interp, M_TEMP); 717 free(ph, M_TEMP); 718 kill_vmcmds(&epp->ep_vmcmds); 719 return ENOEXEC; 720 } 721 722 int 723 ELFNAME2(netbsd,signature)(struct proc *p, struct exec_package *epp, 724 Elf_Ehdr *eh) 725 { 726 size_t i; 727 Elf_Phdr *ph; 728 size_t phsize; 729 int error; 730 731 if (eh->e_phnum > MAXPHNUM) 732 return ENOEXEC; 733 734 phsize = eh->e_phnum * sizeof(Elf_Phdr); 735 ph = (Elf_Phdr *)malloc(phsize, M_TEMP, M_WAITOK); 736 error = exec_read_from(p, epp->ep_vp, eh->e_phoff, ph, phsize); 737 if (error) 738 goto out; 739 740 for (i = 0; i < eh->e_phnum; i++) { 741 Elf_Phdr *ephp = &ph[i]; 742 Elf_Nhdr *np; 743 744 if (ephp->p_type != PT_NOTE || 745 ephp->p_filesz > 1024 || 746 ephp->p_filesz < sizeof(Elf_Nhdr) + ELF_NOTE_NETBSD_NAMESZ) 747 continue; 748 749 np = (Elf_Nhdr *)malloc(ephp->p_filesz, M_TEMP, M_WAITOK); 750 error = exec_read_from(p, epp->ep_vp, ephp->p_offset, np, 751 ephp->p_filesz); 752 if (error) 753 goto next; 754 755 if (np->n_type != ELF_NOTE_TYPE_NETBSD_TAG || 756 np->n_namesz != ELF_NOTE_NETBSD_NAMESZ || 757 np->n_descsz != ELF_NOTE_NETBSD_DESCSZ || 758 memcmp((caddr_t)(np + 1), ELF_NOTE_NETBSD_NAME, 759 ELF_NOTE_NETBSD_NAMESZ)) 760 goto next; 761 762 error = 0; 763 free(np, M_TEMP); 764 goto out; 765 766 next: 767 free(np, M_TEMP); 768 continue; 769 } 770 771 error = ENOEXEC; 772 out: 773 free(ph, M_TEMP); 774 return (error); 775 } 776 777 int 778 ELFNAME2(netbsd,probe)(struct proc *p, struct exec_package *epp, 779 void *eh, char *itp, vaddr_t *pos) 780 { 781 int error; 782 783 if ((error = ELFNAME2(netbsd,signature)(p, epp, eh)) != 0) 784 return error; 785 #ifdef ELF_INTERP_NON_RELOCATABLE 786 *pos = ELF_LINK_ADDR; 787 #endif 788 return 0; 789 }
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