exec_elf32.c revision 1.81
1/* $NetBSD: exec_elf32.c,v 1.81 2003/02/21 03:53:43 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 1.81 2003/02/21 03:53:43 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 ((flags & (VMCMD_TOPDOWN|VMCMD_RELATIVE)) == VMCMD_TOPDOWN) 284 *addr -= round_page(msize); 285 if (psize > 0) { 286 NEW_VMCMD2(vcset, ph->p_align < PAGE_SIZE ? 287 vmcmd_map_readvn : vmcmd_map_pagedvn, psize, *addr, vp, 288 offset, *prot, flags); 289 } 290 if (psize < *size) { 291 NEW_VMCMD2(vcset, vmcmd_map_readvn, *size - psize, 292 *addr + psize, vp, offset + psize, *prot, 293 psize > 0 ? flags & (VMCMD_RELATIVE | VMCMD_TOPDOWN) : flags); 294 } 295 296 /* 297 * Check if we need to extend the size of the segment 298 */ 299 rm = round_page(*addr + msize); 300 rf = round_page(*addr + *size); 301 302 if (rm != rf) { 303 NEW_VMCMD2(vcset, vmcmd_map_zero, rm - rf, rf, NULLVP, 304 0, *prot, flags & (VMCMD_RELATIVE | VMCMD_TOPDOWN)); 305 *size = msize; 306 } 307} 308 309/* 310 * elf_load_file(): 311 * 312 * Load a file (interpreter/library) pointed to by path 313 * [stolen from coff_load_shlib()]. Made slightly generic 314 * so it might be used externally. 315 */ 316int 317ELFNAME(load_file)(struct proc *p, struct exec_package *epp, char *path, 318 struct exec_vmcmd_set *vcset, u_long *entryoff, struct elf_args *ap, 319 Elf_Addr *last) 320{ 321 int error, i; 322 const int topdown = 323 p->p_vmspace->vm_map.flags & VM_MAP_TOPDOWN ? VMCMD_TOPDOWN : 0; 324 struct nameidata nd; 325 struct vnode *vp; 326 struct vattr attr; 327 Elf_Ehdr eh; 328 Elf_Phdr *ph = NULL; 329 Elf_Phdr *base_ph = NULL; 330 u_long phsize; 331 Elf_Addr addr = *last; 332 333 /* 334 * 1. open file 335 * 2. read filehdr 336 * 3. map text, data, and bss out of it using VM_* 337 */ 338 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, path, p); 339 if ((error = namei(&nd)) != 0) 340 return error; 341 vp = nd.ni_vp; 342 343 /* 344 * Similarly, if it's not marked as executable, or it's not a regular 345 * file, we don't allow it to be used. 346 */ 347 if (vp->v_type != VREG) { 348 error = EACCES; 349 goto badunlock; 350 } 351 if ((error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p)) != 0) 352 goto badunlock; 353 354 /* get attributes */ 355 if ((error = VOP_GETATTR(vp, &attr, p->p_ucred, p)) != 0) 356 goto badunlock; 357 358 /* 359 * Check mount point. Though we're not trying to exec this binary, 360 * we will be executing code from it, so if the mount point 361 * disallows execution or set-id-ness, we punt or kill the set-id. 362 */ 363 if (vp->v_mount->mnt_flag & MNT_NOEXEC) { 364 error = EACCES; 365 goto badunlock; 366 } 367 if (vp->v_mount->mnt_flag & MNT_NOSUID) 368 epp->ep_vap->va_mode &= ~(S_ISUID | S_ISGID); 369 370#ifdef notyet /* XXX cgd 960926 */ 371 XXX cgd 960926: (maybe) VOP_OPEN it (and VOP_CLOSE in copyargs?) 372#endif 373 374 error = vn_marktext(vp); 375 if (error) 376 goto badunlock; 377 378 VOP_UNLOCK(vp, 0); 379 380 if ((error = exec_read_from(p, vp, 0, &eh, sizeof(eh))) != 0) 381 goto bad; 382 383 if ((error = ELFNAME(check_header)(&eh, ET_DYN)) != 0) 384 goto bad; 385 386 phsize = eh.e_phnum * sizeof(Elf_Phdr); 387 ph = (Elf_Phdr *)malloc(phsize, M_TEMP, M_WAITOK); 388 389 if ((error = exec_read_from(p, vp, eh.e_phoff, ph, phsize)) != 0) 390 goto bad; 391 392 /* 393 * Load all the necessary sections 394 */ 395 for (i = 0; i < eh.e_phnum; i++) { 396 u_long size = 0; 397 int prot = 0; 398 int flags; 399 400 switch (ph[i].p_type) { 401 case PT_LOAD: 402 if (base_ph == NULL) { 403 addr = *last; 404 flags = VMCMD_BASE; 405 } else { 406 addr = ph[i].p_vaddr - base_ph->p_vaddr; 407 flags = VMCMD_RELATIVE; 408 } 409 ELFNAME(load_psection)(vcset, vp, &ph[i], &addr, 410 &size, &prot, flags|topdown); 411 /* If entry is within this section it must be text */ 412 if (eh.e_entry >= ph[i].p_vaddr && 413 eh.e_entry < (ph[i].p_vaddr + size)) { 414 *entryoff = eh.e_entry - ph[i].p_vaddr; 415 } 416 if (base_ph == NULL) 417 base_ph = &ph[i]; 418 if (ph[i].p_vaddr != 0) 419 addr += size; 420 break; 421 422 case PT_DYNAMIC: 423 case PT_PHDR: 424 case PT_NOTE: 425 break; 426 427 default: 428 break; 429 } 430 } 431 432 free(ph, M_TEMP); 433 *last = addr; 434 vrele(vp); 435 return 0; 436 437badunlock: 438 VOP_UNLOCK(vp, 0); 439 440bad: 441 if (ph != NULL) 442 free(ph, M_TEMP); 443#ifdef notyet /* XXX cgd 960926 */ 444 (maybe) VOP_CLOSE it 445#endif 446 vrele(vp); 447 return error; 448} 449 450/* 451 * exec_elf_makecmds(): Prepare an Elf binary's exec package 452 * 453 * First, set of the various offsets/lengths in the exec package. 454 * 455 * Then, mark the text image busy (so it can be demand paged) or error 456 * out if this is not possible. Finally, set up vmcmds for the 457 * text, data, bss, and stack segments. 458 */ 459int 460ELFNAME2(exec,makecmds)(struct proc *p, struct exec_package *epp) 461{ 462 Elf_Ehdr *eh = epp->ep_hdr; 463 Elf_Phdr *ph, *pp; 464 Elf_Addr phdr = 0, pos = 0; 465 int error, i, nload; 466 char *interp = NULL; 467 u_long phsize; 468 469 if (epp->ep_hdrvalid < sizeof(Elf_Ehdr)) 470 return ENOEXEC; 471 472 /* 473 * XXX allow for executing shared objects. It seems silly 474 * but other ELF-based systems allow it as well. 475 */ 476 if (ELFNAME(check_header)(eh, ET_EXEC) != 0 && 477 ELFNAME(check_header)(eh, ET_DYN) != 0) 478 return ENOEXEC; 479 480 error = vn_marktext(epp->ep_vp); 481 if (error) 482 return (error); 483 484 /* 485 * Allocate space to hold all the program headers, and read them 486 * from the file 487 */ 488 phsize = eh->e_phnum * sizeof(Elf_Phdr); 489 ph = (Elf_Phdr *)malloc(phsize, M_TEMP, M_WAITOK); 490 491 if ((error = exec_read_from(p, epp->ep_vp, eh->e_phoff, ph, phsize)) != 492 0) 493 goto bad; 494 495 epp->ep_taddr = epp->ep_tsize = ELFDEFNNAME(NO_ADDR); 496 epp->ep_daddr = epp->ep_dsize = ELFDEFNNAME(NO_ADDR); 497 498 MALLOC(interp, char *, MAXPATHLEN, M_TEMP, M_WAITOK); 499 interp[0] = '\0'; 500 501 for (i = 0; i < eh->e_phnum; i++) { 502 pp = &ph[i]; 503 if (pp->p_type == PT_INTERP) { 504 if (pp->p_filesz >= MAXPATHLEN) 505 goto bad; 506 if ((error = exec_read_from(p, epp->ep_vp, 507 pp->p_offset, interp, pp->p_filesz)) != 0) 508 goto bad; 509 break; 510 } 511 } 512 513 /* 514 * On the same architecture, we may be emulating different systems. 515 * See which one will accept this executable. This currently only 516 * applies to SVR4, and IBCS2 on the i386 and Linux on the i386 517 * and the Alpha. 518 * 519 * Probe functions would normally see if the interpreter (if any) 520 * exists. Emulation packages may possibly replace the interpreter in 521 * interp[] with a changed path (/emul/xxx/<path>). 522 */ 523 if (!epp->ep_esch->u.elf_probe_func) { 524 pos = ELFDEFNNAME(NO_ADDR); 525 } else { 526 vaddr_t startp = 0; 527 528 error = (*epp->ep_esch->u.elf_probe_func)(p, epp, eh, interp, 529 &startp); 530 pos = (Elf_Addr)startp; 531 if (error) 532 goto bad; 533 } 534 535 /* 536 * Load all the necessary sections 537 */ 538 for (i = nload = 0; i < eh->e_phnum; i++) { 539 Elf_Addr addr = ELFDEFNNAME(NO_ADDR); 540 u_long size = 0; 541 int prot = 0; 542 543 pp = &ph[i]; 544 545 switch (ph[i].p_type) { 546 case PT_LOAD: 547 /* 548 * XXX 549 * Can handle only 2 sections: text and data 550 */ 551 if (nload++ == 2) 552 goto bad; 553 ELFNAME(load_psection)(&epp->ep_vmcmds, epp->ep_vp, 554 &ph[i], &addr, &size, &prot, VMCMD_FIXED); 555 556 /* 557 * Decide whether it's text or data by looking 558 * at the entry point. 559 */ 560 if (eh->e_entry >= addr && 561 eh->e_entry < (addr + size)) { 562 epp->ep_taddr = addr; 563 epp->ep_tsize = size; 564 if (epp->ep_daddr == ELFDEFNNAME(NO_ADDR)) { 565 epp->ep_daddr = addr; 566 epp->ep_dsize = size; 567 } 568 } else { 569 epp->ep_daddr = addr; 570 epp->ep_dsize = size; 571 } 572 break; 573 574 case PT_SHLIB: 575 /* SCO has these sections. */ 576 case PT_INTERP: 577 /* Already did this one. */ 578 case PT_DYNAMIC: 579 case PT_NOTE: 580 break; 581 582 case PT_PHDR: 583 /* Note address of program headers (in text segment) */ 584 phdr = pp->p_vaddr; 585 break; 586 587 default: 588 /* 589 * Not fatal; we don't need to understand everything. 590 */ 591 break; 592 } 593 } 594 595 /* this breaks on, e.g., OpenBSD-compatible mips shared binaries. */ 596#ifndef ELF_INTERP_NON_RELOCATABLE 597 /* 598 * If no position to load the interpreter was set by a probe 599 * function, pick the same address that a non-fixed mmap(0, ..) 600 * would (i.e. something safely out of the way). 601 */ 602 if (pos == ELFDEFNNAME(NO_ADDR)) 603 /* XXX size will be accounted for in load_psection */ 604 pos = VM_DEFAULT_ADDRESS(epp->ep_daddr, 0); 605#endif /* !ELF_INTERP_NON_RELOCATABLE */ 606 607 /* 608 * Check if we found a dynamically linked binary and arrange to load 609 * its interpreter 610 */ 611 if (interp[0]) { 612 struct elf_args *ap; 613 int i = epp->ep_vmcmds.evs_used; 614 u_long interp_offset; 615 616 MALLOC(ap, struct elf_args *, sizeof(struct elf_args), 617 M_TEMP, M_WAITOK); 618 if ((error = ELFNAME(load_file)(p, epp, interp, 619 &epp->ep_vmcmds, &interp_offset, ap, &pos)) != 0) { 620 FREE(ap, M_TEMP); 621 goto bad; 622 } 623 ap->arg_interp = epp->ep_vmcmds.evs_cmds[i].ev_addr; 624 epp->ep_entry = ap->arg_interp + interp_offset; 625 ap->arg_phaddr = phdr; 626 627 ap->arg_phentsize = eh->e_phentsize; 628 ap->arg_phnum = eh->e_phnum; 629 ap->arg_entry = eh->e_entry; 630 631 epp->ep_emul_arg = ap; 632 } else 633 epp->ep_entry = eh->e_entry; 634 635#ifdef ELF_MAP_PAGE_ZERO 636 /* Dell SVR4 maps page zero, yeuch! */ 637 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, PAGE_SIZE, 0, 638 epp->ep_vp, 0, VM_PROT_READ); 639#endif 640 FREE(interp, M_TEMP); 641 free(ph, M_TEMP); 642 return exec_elf_setup_stack(p, epp); 643 644bad: 645 if (interp) 646 FREE(interp, M_TEMP); 647 free(ph, M_TEMP); 648 kill_vmcmds(&epp->ep_vmcmds); 649 return ENOEXEC; 650} 651 652int 653ELFNAME2(netbsd,signature)(struct proc *p, struct exec_package *epp, 654 Elf_Ehdr *eh) 655{ 656 size_t i; 657 Elf_Phdr *ph; 658 size_t phsize; 659 int error; 660 661 phsize = eh->e_phnum * sizeof(Elf_Phdr); 662 ph = (Elf_Phdr *)malloc(phsize, M_TEMP, M_WAITOK); 663 error = exec_read_from(p, epp->ep_vp, eh->e_phoff, ph, phsize); 664 if (error) 665 goto out; 666 667 for (i = 0; i < eh->e_phnum; i++) { 668 Elf_Phdr *ephp = &ph[i]; 669 Elf_Nhdr *np; 670 671 if (ephp->p_type != PT_NOTE || 672 ephp->p_filesz > 1024 || 673 ephp->p_filesz < sizeof(Elf_Nhdr) + ELF_NOTE_NETBSD_NAMESZ) 674 continue; 675 676 np = (Elf_Nhdr *)malloc(ephp->p_filesz, M_TEMP, M_WAITOK); 677 error = exec_read_from(p, epp->ep_vp, ephp->p_offset, np, 678 ephp->p_filesz); 679 if (error) 680 goto next; 681 682 if (np->n_type != ELF_NOTE_TYPE_NETBSD_TAG || 683 np->n_namesz != ELF_NOTE_NETBSD_NAMESZ || 684 np->n_descsz != ELF_NOTE_NETBSD_DESCSZ || 685 memcmp((caddr_t)(np + 1), ELF_NOTE_NETBSD_NAME, 686 ELF_NOTE_NETBSD_NAMESZ)) 687 goto next; 688 689 error = 0; 690 free(np, M_TEMP); 691 goto out; 692 693 next: 694 free(np, M_TEMP); 695 continue; 696 } 697 698 error = ENOEXEC; 699out: 700 free(ph, M_TEMP); 701 return (error); 702} 703 704int 705ELFNAME2(netbsd,probe)(struct proc *p, struct exec_package *epp, 706 void *eh, char *itp, vaddr_t *pos) 707{ 708 int error; 709 710 if ((error = ELFNAME2(netbsd,signature)(p, epp, eh)) != 0) 711 return error; 712 *pos = ELFDEFNNAME(NO_ADDR); 713 return 0; 714} 715