1 /*	$NetBSD: freebsd_exec_elf32.c,v 1.9 2002/11/29 19:13:14 jdolecek 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/cdefs.h>
34 __KERNEL_RCSID(0, "$NetBSD: freebsd_exec_elf32.c,v 1.9 2002/11/29 19:13:14 jdolecek Exp $");
35 
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>
46 
47 #include <machine/freebsd_machdep.h>
48 
49 #include <compat/freebsd/freebsd_exec.h>
50 #include <compat/common/compat_util.h>
51 
52 int
53 ELFNAME2(freebsd,probe)(p, epp, veh, itp, pos)
54 	struct proc *p;
55 	struct exec_package *epp;
56 	void *veh;
57 	char *itp;
58 	vaddr_t *pos;
59 {
60 	int error;
61 	size_t i;
62 	size_t phsize;
63 	Elf_Ehdr *eh = (Elf_Ehdr *) veh;
64 	Elf_Phdr *ph;
65 	Elf_Phdr *ephp;
66 	Elf_Nhdr *np;
67 
68         static const char wantBrand[] = FREEBSD_ELF_BRAND_STRING;
69         static const char wantInterp[] = FREEBSD_ELF_INTERP_PREFIX_STRING;
70 
71         /*
72 	 * Insist that the executable have a brand, and that it be "FreeBSD".
73 	 * Newer FreeBSD binaries have OSABI set to ELFOSABI_FREEBSD. This
74 	 * is arguably broken, but they seem to think they need it, for
75 	 * whatever reason.
76 	 */
77 #ifndef EI_BRAND
78 #define EI_BRAND 8
79 #endif
80         if ((eh->e_ident[EI_BRAND] == '\0'
81 		|| strcmp(&eh->e_ident[EI_BRAND], wantBrand) != 0)
82 	    && eh->e_ident[EI_OSABI] != ELFOSABI_FREEBSD)
83 		return ENOEXEC;
84 
85 	i = eh->e_phnum;
86 	if (i != 0) {
87 		phsize = i * sizeof(Elf_Phdr);
88 		ph = (Elf_Phdr *) malloc(phsize, M_TEMP, M_WAITOK);
89 		if ((error = exec_read_from(p, epp->ep_vp, eh->e_phoff, ph,
90 		    phsize)) != 0)
91 			goto bad1;
92 
93 		for (ephp = ph; i--; ephp++) {
94 			if (ephp->p_type != PT_INTERP)
95 				continue;
96 
97 			/* Check for "legal" intepreter name. */
98 			if (ephp->p_filesz < sizeof wantInterp)
99 				goto bad1;
100 
101 			np = (Elf_Nhdr *) malloc(ephp->p_filesz+1,
102 			    M_TEMP, M_WAITOK);
103 
104 			if (((error = exec_read_from(p, epp->ep_vp,
105 			    ephp->p_offset, np, ephp->p_filesz)) != 0))
106 				goto bad2;
107 
108 			if (strncmp((char *)np, wantInterp,
109 			    sizeof wantInterp - 1))
110 				goto bad2;
111 
112 			free(np, M_TEMP);
113 			break;
114 		}
115 		free(ph, M_TEMP);
116 	}
117 
118 	if (itp[0]) {
119 		if ((error = emul_find_interp(p, epp->ep_esch->es_emul->e_path,
120 		    itp)))
121 			return error;
122 	}
123 	*pos = ELF_NO_ADDR;
124 #ifdef DEBUG_FREEBSD_ELF
125 	printf("freebsd_elf32_probe: returning 0\n");
126 #endif
127 	return 0;
128 
129 bad2:
130 	free(np, M_TEMP);
131 bad1:
132 	free(ph, M_TEMP);
133 	return ENOEXEC;
134 }
135