freebsd_exec_elf32.c revision 1.4 1 /* $NetBSD: freebsd_exec_elf32.c,v 1.4 2001/10/23 16:43:33 christos Exp $ */
2
3 /*
4 * Copyright (c) 1993, 1994 Christopher G. Demetriou
5 * All rights reserved.
6 *
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
20 *
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.
31 */
32
33 #include <sys/param.h>
34 #include <sys/systm.h>
35 #include <sys/proc.h>
36 #include <sys/malloc.h>
37 #include <sys/vnode.h>
38 #include <sys/exec.h>
39 #ifndef ELFSIZE
40 # define ELFSIZE 32
41 #endif /* !ELFSIZE */
42 #include <sys/exec_elf.h>
43
44 #include <machine/freebsd_machdep.h>
45
46 #include <compat/freebsd/freebsd_exec.h>
47 #include <compat/common/compat_util.h>
48
49 int
50 ELFNAME2(freebsd,probe)(p, epp, veh, itp, pos)
51 struct proc *p;
52 struct exec_package *epp;
53 void *veh;
54 char *itp;
55 vaddr_t *pos;
56 {
57 int error;
58 size_t i;
59 size_t phsize;
60 Elf_Ehdr *eh = (Elf_Ehdr *) veh;
61 Elf_Phdr *ph;
62 Elf_Phdr *ephp;
63 Elf_Nhdr *np;
64 const char *bp;
65
66 static const char wantBrand[] = FREEBSD_ELF_BRAND_STRING;
67 static const char wantInterp[] = FREEBSD_ELF_INTERP_PREFIX_STRING;
68
69 /* Insist that the executable have a brand, and that it be "FreeBSD" */
70 #ifndef EI_BRAND
71 #define EI_BRAND 8
72 #endif
73 if (eh->e_ident[EI_BRAND] == '\0'
74 || strcmp(&eh->e_ident[EI_BRAND], wantBrand))
75 if (eh->e_ident[EI_OSABI] != ELFOSABI_FREEBSD)
76 return ENOEXEC;
77
78 i = eh->e_phnum;
79 if (i != 0) {
80 phsize = i * sizeof(Elf_Phdr);
81 ph = (Elf_Phdr *) malloc(phsize, M_TEMP, M_WAITOK);
82 if ((error = exec_read_from(p, epp->ep_vp, eh->e_phoff, ph,
83 phsize)) != 0)
84 goto bad1;
85
86 for (ephp = ph; i--; ephp++) {
87 if (ephp->p_type != PT_INTERP)
88 continue;
89
90 /* Check for "legal" intepreter name. */
91 if (ephp->p_filesz < sizeof wantInterp)
92 goto bad1;
93
94 np = (Elf_Nhdr *) malloc(ephp->p_filesz+1,
95 M_TEMP, M_WAITOK);
96
97 if (((error = exec_read_from(p, epp->ep_vp,
98 ephp->p_offset, np, ephp->p_filesz)) != 0))
99 goto bad2;
100
101 if (strncmp((char *)np, wantInterp,
102 sizeof wantInterp - 1))
103 goto bad2;
104
105 free(np, M_TEMP);
106 break;
107 }
108 free(ph, M_TEMP);
109 }
110
111 if (itp[0]) {
112 if ((error = emul_find(p, NULL, epp->ep_esch->es_emul->e_path,
113 itp, &bp, 0)))
114 return error;
115 if ((error = copystr(bp, itp, MAXPATHLEN, &i)) != 0)
116 return error;
117 free((void *)bp, M_TEMP);
118 }
119 *pos = ELF_NO_ADDR;
120 #ifdef DEBUG_FREEBSD_ELF
121 printf("freebsd_elf32_probe: returning 0\n");
122 #endif
123 return 0;
124
125 bad2:
126 free(np, M_TEMP);
127 bad1:
128 free(ph, M_TEMP);
129 return ENOEXEC;
130 }
131