exec_elf32.c revision 1.85
1/*	$NetBSD: exec_elf32.c,v 1.85 2003/02/27 23:48:29 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 1.85 2003/02/27 23:48:29 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 + MAXDSIZ,
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				u_long base = trunc_page(
445				     ELF_TRUNC(ph0->p_vaddr, ph0->p_align));
446
447				/*
448				 * If there is a gap in between the psections,
449				 * map it as inaccessible so nothing else
450				 * mmap'ed will be placed there.
451				 */
452				if (limit != base) {
453					NEW_VMCMD2(vcset, vmcmd_map_zero,
454					    base - limit,
455					    limit - base_ph->p_vaddr,
456					    NULLVP, 0, 0, VMCMD_RELATIVE);
457				}
458
459				addr = ph0->p_vaddr - base_ph->p_vaddr;
460				flags = VMCMD_RELATIVE;
461			}
462			last_ph = ph0;
463			ELFNAME(load_psection)(vcset, vp, &ph[i], &addr,
464			    &size, &prot, flags);
465			/*
466			 * If entry is within this psection then this
467			 * must contain the .text section.  *entryoff is
468			 * relative to the base psection.
469			 */
470			if (eh.e_entry >= ph0->p_vaddr &&
471			    eh.e_entry < (ph0->p_vaddr + size)) {
472				*entryoff = eh.e_entry - base_ph->p_vaddr;
473			}
474			addr += size;
475			break;
476		}
477
478		case PT_DYNAMIC:
479		case PT_PHDR:
480		case PT_NOTE:
481			break;
482
483		default:
484			break;
485		}
486	}
487
488	free(ph, M_TEMP);
489	/*
490	 * This value is ignored if TOPDOWN.
491	 */
492	*last = addr;
493	vrele(vp);
494	return 0;
495
496badunlock:
497	VOP_UNLOCK(vp, 0);
498
499bad:
500	if (ph != NULL)
501		free(ph, M_TEMP);
502#ifdef notyet /* XXX cgd 960926 */
503	(maybe) VOP_CLOSE it
504#endif
505	vrele(vp);
506	return error;
507}
508
509/*
510 * exec_elf_makecmds(): Prepare an Elf binary's exec package
511 *
512 * First, set of the various offsets/lengths in the exec package.
513 *
514 * Then, mark the text image busy (so it can be demand paged) or error
515 * out if this is not possible.  Finally, set up vmcmds for the
516 * text, data, bss, and stack segments.
517 */
518int
519ELFNAME2(exec,makecmds)(struct proc *p, struct exec_package *epp)
520{
521	Elf_Ehdr *eh = epp->ep_hdr;
522	Elf_Phdr *ph, *pp;
523	Elf_Addr phdr = 0, pos = 0;
524	int error, i, nload;
525	char *interp = NULL;
526	u_long phsize;
527
528	if (epp->ep_hdrvalid < sizeof(Elf_Ehdr))
529		return ENOEXEC;
530
531	/*
532	 * XXX allow for executing shared objects. It seems silly
533	 * but other ELF-based systems allow it as well.
534	 */
535	if (ELFNAME(check_header)(eh, ET_EXEC) != 0 &&
536	    ELFNAME(check_header)(eh, ET_DYN) != 0)
537		return ENOEXEC;
538
539	error = vn_marktext(epp->ep_vp);
540	if (error)
541		return (error);
542
543	/*
544	 * Allocate space to hold all the program headers, and read them
545	 * from the file
546	 */
547	phsize = eh->e_phnum * sizeof(Elf_Phdr);
548	ph = (Elf_Phdr *)malloc(phsize, M_TEMP, M_WAITOK);
549
550	if ((error = exec_read_from(p, epp->ep_vp, eh->e_phoff, ph, phsize)) !=
551	    0)
552		goto bad;
553
554	epp->ep_taddr = epp->ep_tsize = ELFDEFNNAME(NO_ADDR);
555	epp->ep_daddr = epp->ep_dsize = ELFDEFNNAME(NO_ADDR);
556
557	MALLOC(interp, char *, MAXPATHLEN, M_TEMP, M_WAITOK);
558	interp[0] = '\0';
559
560	for (i = 0; i < eh->e_phnum; i++) {
561		pp = &ph[i];
562		if (pp->p_type == PT_INTERP) {
563			if (pp->p_filesz >= MAXPATHLEN)
564				goto bad;
565			if ((error = exec_read_from(p, epp->ep_vp,
566			    pp->p_offset, interp, pp->p_filesz)) != 0)
567				goto bad;
568			break;
569		}
570	}
571
572	/*
573	 * On the same architecture, we may be emulating different systems.
574	 * See which one will accept this executable. This currently only
575	 * applies to SVR4, and IBCS2 on the i386 and Linux on the i386
576	 * and the Alpha.
577	 *
578	 * Probe functions would normally see if the interpreter (if any)
579	 * exists. Emulation packages may possibly replace the interpreter in
580	 * interp[] with a changed path (/emul/xxx/<path>).
581	 */
582	if (!epp->ep_esch->u.elf_probe_func) {
583		pos = ELFDEFNNAME(NO_ADDR);
584	} else {
585		vaddr_t startp = 0;
586
587		error = (*epp->ep_esch->u.elf_probe_func)(p, epp, eh, interp,
588							  &startp);
589		pos = (Elf_Addr)startp;
590		if (error)
591			goto bad;
592	}
593
594	/*
595	 * Load all the necessary sections
596	 */
597	for (i = nload = 0; i < eh->e_phnum; i++) {
598		Elf_Addr  addr = ELFDEFNNAME(NO_ADDR);
599		u_long size = 0;
600		int prot = 0;
601
602		pp = &ph[i];
603
604		switch (ph[i].p_type) {
605		case PT_LOAD:
606			/*
607			 * XXX
608			 * Can handle only 2 sections: text and data
609			 */
610			if (nload++ == 2)
611				goto bad;
612			ELFNAME(load_psection)(&epp->ep_vmcmds, epp->ep_vp,
613			    &ph[i], &addr, &size, &prot, VMCMD_FIXED);
614
615			/*
616			 * Decide whether it's text or data by looking
617			 * at the entry point.
618			 */
619			if (eh->e_entry >= addr &&
620			    eh->e_entry < (addr + size)) {
621				epp->ep_taddr = addr;
622				epp->ep_tsize = size;
623				if (epp->ep_daddr == ELFDEFNNAME(NO_ADDR)) {
624					epp->ep_daddr = addr;
625					epp->ep_dsize = size;
626				}
627			} else {
628				epp->ep_daddr = addr;
629				epp->ep_dsize = size;
630			}
631			break;
632
633		case PT_SHLIB:
634			/* SCO has these sections. */
635		case PT_INTERP:
636			/* Already did this one. */
637		case PT_DYNAMIC:
638		case PT_NOTE:
639			break;
640
641		case PT_PHDR:
642			/* Note address of program headers (in text segment) */
643			phdr = pp->p_vaddr;
644			break;
645
646		default:
647			/*
648			 * Not fatal; we don't need to understand everything.
649			 */
650			break;
651		}
652	}
653
654	/*
655	 * Check if we found a dynamically linked binary and arrange to load
656	 * its interpreter
657	 */
658	if (interp[0]) {
659		struct elf_args *ap;
660		int i = epp->ep_vmcmds.evs_used;
661		u_long interp_offset;
662
663		MALLOC(ap, struct elf_args *, sizeof(struct elf_args),
664		    M_TEMP, M_WAITOK);
665		if ((error = ELFNAME(load_file)(p, epp, interp,
666		    &epp->ep_vmcmds, &interp_offset, ap, &pos)) != 0) {
667			FREE(ap, M_TEMP);
668			goto bad;
669		}
670		ap->arg_interp = epp->ep_vmcmds.evs_cmds[i].ev_addr;
671		epp->ep_entry = ap->arg_interp + interp_offset;
672		ap->arg_phaddr = phdr;
673
674		ap->arg_phentsize = eh->e_phentsize;
675		ap->arg_phnum = eh->e_phnum;
676		ap->arg_entry = eh->e_entry;
677
678		epp->ep_emul_arg = ap;
679	} else
680		epp->ep_entry = eh->e_entry;
681
682#ifdef ELF_MAP_PAGE_ZERO
683	/* Dell SVR4 maps page zero, yeuch! */
684	NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, PAGE_SIZE, 0,
685	    epp->ep_vp, 0, VM_PROT_READ);
686#endif
687	FREE(interp, M_TEMP);
688	free(ph, M_TEMP);
689	return exec_elf_setup_stack(p, epp);
690
691bad:
692	if (interp)
693		FREE(interp, M_TEMP);
694	free(ph, M_TEMP);
695	kill_vmcmds(&epp->ep_vmcmds);
696	return ENOEXEC;
697}
698
699int
700ELFNAME2(netbsd,signature)(struct proc *p, struct exec_package *epp,
701    Elf_Ehdr *eh)
702{
703	size_t i;
704	Elf_Phdr *ph;
705	size_t phsize;
706	int error;
707
708	phsize = eh->e_phnum * sizeof(Elf_Phdr);
709	ph = (Elf_Phdr *)malloc(phsize, M_TEMP, M_WAITOK);
710	error = exec_read_from(p, epp->ep_vp, eh->e_phoff, ph, phsize);
711	if (error)
712		goto out;
713
714	for (i = 0; i < eh->e_phnum; i++) {
715		Elf_Phdr *ephp = &ph[i];
716		Elf_Nhdr *np;
717
718		if (ephp->p_type != PT_NOTE ||
719		    ephp->p_filesz > 1024 ||
720		    ephp->p_filesz < sizeof(Elf_Nhdr) + ELF_NOTE_NETBSD_NAMESZ)
721			continue;
722
723		np = (Elf_Nhdr *)malloc(ephp->p_filesz, M_TEMP, M_WAITOK);
724		error = exec_read_from(p, epp->ep_vp, ephp->p_offset, np,
725		    ephp->p_filesz);
726		if (error)
727			goto next;
728
729		if (np->n_type != ELF_NOTE_TYPE_NETBSD_TAG ||
730		    np->n_namesz != ELF_NOTE_NETBSD_NAMESZ ||
731		    np->n_descsz != ELF_NOTE_NETBSD_DESCSZ ||
732		    memcmp((caddr_t)(np + 1), ELF_NOTE_NETBSD_NAME,
733		    ELF_NOTE_NETBSD_NAMESZ))
734			goto next;
735
736		error = 0;
737		free(np, M_TEMP);
738		goto out;
739
740	next:
741		free(np, M_TEMP);
742		continue;
743	}
744
745	error = ENOEXEC;
746out:
747	free(ph, M_TEMP);
748	return (error);
749}
750
751int
752ELFNAME2(netbsd,probe)(struct proc *p, struct exec_package *epp,
753    void *eh, char *itp, vaddr_t *pos)
754{
755	int error;
756
757	if ((error = ELFNAME2(netbsd,signature)(p, epp, eh)) != 0)
758		return error;
759	*pos = ELFDEFNNAME(NO_ADDR);
760	return 0;
761}
762