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[netbsd-mini2440.git] / sys / compat / freebsd / freebsd_exec_elf32.c
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1 /* $NetBSD: freebsd_exec_elf32.c,v 1.16 2006/11/16 01:32:42 christos Exp $ */
3 /*
4 * Copyright (c) 1993, 1994 Christopher G. Demetriou
5 * All rights reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed by Christopher G. Demetriou.
18 * 4. The name of the author may not be used to endorse or promote products
19 * derived from this software without specific prior written permission
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 #include <sys/cdefs.h>
34 __KERNEL_RCSID(0, "$NetBSD: freebsd_exec_elf32.c,v 1.16 2006/11/16 01:32:42 christos Exp $");
36 #include <sys/param.h>
37 #include <sys/systm.h>
38 #include <sys/proc.h>
39 #include <sys/malloc.h>
40 #include <sys/vnode.h>
41 #include <sys/exec.h>
42 #ifndef ELFSIZE
43 # define ELFSIZE 32
44 #endif /* !ELFSIZE */
45 #include <sys/exec_elf.h>
47 #include <compat/sys/signal.h>
48 #include <compat/sys/signalvar.h>
50 #include <compat/freebsd/freebsd_exec.h>
51 #include <compat/common/compat_util.h>
53 #include <machine/freebsd_machdep.h>
56 int
57 ELFNAME2(freebsd,probe)(
58 struct lwp *l,
59 struct exec_package *epp,
60 void *veh,
61 char *itp,
62 vaddr_t *pos)
64 int error;
65 size_t i;
66 size_t phsize;
67 Elf_Ehdr *eh = (Elf_Ehdr *) veh;
68 Elf_Phdr *ph;
69 Elf_Phdr *ephp;
70 Elf_Nhdr *np;
72 static const char wantBrand[] = FREEBSD_ELF_BRAND_STRING;
73 static const char wantInterp[] = FREEBSD_ELF_INTERP_PREFIX_STRING;
76 * Insist that the executable have a brand, and that it be "FreeBSD".
77 * Newer FreeBSD binaries have OSABI set to ELFOSABI_FREEBSD. This
78 * is arguably broken, but they seem to think they need it, for
79 * whatever reason.
81 #ifndef EI_BRAND
82 #define EI_BRAND 8
83 #endif
84 if ((eh->e_ident[EI_BRAND] == '\0'
85 || strcmp(&eh->e_ident[EI_BRAND], wantBrand) != 0)
86 && eh->e_ident[EI_OSABI] != ELFOSABI_FREEBSD)
87 return ENOEXEC;
89 i = eh->e_phnum;
90 if (i != 0) {
91 phsize = i * sizeof(Elf_Phdr);
92 ph = (Elf_Phdr *) malloc(phsize, M_TEMP, M_WAITOK);
93 if ((error = exec_read_from(l, epp->ep_vp, eh->e_phoff, ph,
94 phsize)) != 0)
95 goto bad1;
97 for (ephp = ph; i--; ephp++) {
98 if (ephp->p_type != PT_INTERP)
99 continue;
101 /* Check for "legal" intepreter name. */
102 if (ephp->p_filesz < sizeof wantInterp)
103 goto bad1;
105 np = (Elf_Nhdr *) malloc(ephp->p_filesz+1,
106 M_TEMP, M_WAITOK);
108 if (((error = exec_read_from(l, epp->ep_vp,
109 ephp->p_offset, np, ephp->p_filesz)) != 0))
110 goto bad2;
112 if (strncmp((char *)np, wantInterp,
113 sizeof wantInterp - 1))
114 goto bad2;
116 free(np, M_TEMP);
117 break;
119 free(ph, M_TEMP);
122 if (itp) {
123 if ((error = emul_find_interp(l, epp, itp)))
124 return error;
126 #ifdef DEBUG_FREEBSD_ELF
127 printf("freebsd_elf32_probe: returning 0\n");
128 #endif
129 return 0;
131 bad2:
132 free(np, M_TEMP);
133 bad1:
134 free(ph, M_TEMP);
135 return ENOEXEC;