1 /* $NetBSD: netbsd32_exec_elf32.c,v 1.32 2009/12/14 04:09:38 mrg Exp $ */ 2 /* from: NetBSD: exec_aout.c,v 1.15 1996/09/26 23:34:46 cgd Exp */ 3 4 /* 5 * Copyright (c) 1998, 2001 Matthew R. Green. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 /* 30 * Copyright (c) 1993, 1994 Christopher G. Demetriou 31 * All rights reserved. 32 * 33 * Redistribution and use in source and binary forms, with or without 34 * modification, are permitted provided that the following conditions 35 * are met: 36 * 1. Redistributions of source code must retain the above copyright 37 * notice, this list of conditions and the following disclaimer. 38 * 2. Redistributions in binary form must reproduce the above copyright 39 * notice, this list of conditions and the following disclaimer in the 40 * documentation and/or other materials provided with the distribution. 41 * 3. All advertising materials mentioning features or use of this software 42 * must display the following acknowledgement: 43 * This product includes software developed by Christopher G. Demetriou. 44 * 4. The name of the author may not be used to endorse or promote products 45 * derived from this software without specific prior written permission 46 * 47 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 48 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 49 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 50 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 51 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 52 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 53 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 54 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 55 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 56 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 57 */ 58 59 #include <sys/cdefs.h> 60 __KERNEL_RCSID(0, "$NetBSD: netbsd32_exec_elf32.c,v 1.32 2009/12/14 04:09:38 mrg Exp $"); 61 62 #define ELFSIZE 32 63 64 #include <sys/param.h> 65 #include <sys/systm.h> 66 #include <sys/proc.h> 67 #include <sys/malloc.h> 68 #include <sys/vnode.h> 69 #include <sys/exec.h> 70 #include <sys/exec_elf.h> 71 #include <sys/resourcevar.h> 72 #include <sys/signal.h> 73 #include <sys/signalvar.h> 74 #include <sys/kauth.h> 75 #include <sys/namei.h> 76 77 #include <compat/common/compat_util.h> 78 79 #include <compat/netbsd32/netbsd32.h> 80 #include <compat/netbsd32/netbsd32_exec.h> 81 82 #include <machine/netbsd32_machdep.h> 83 84 int netbsd32_copyinargs(struct exec_package *, struct ps_strings *, 85 void *, size_t, const void *, const void *); 86 int ELFNAME2(netbsd32,probe_noteless)(struct lwp *, struct exec_package *epp, 87 void *eh, char *itp, vaddr_t *pos); 88 extern int ELFNAME2(netbsd,signature)(struct lwp *, struct exec_package *, 89 Elf_Ehdr *); 90 91 int 92 ELFNAME2(netbsd32,probe)(struct lwp *l, struct exec_package *epp, 93 void *eh, char *itp, vaddr_t *pos) 94 { 95 int error; 96 97 if ((error = ELFNAME2(netbsd,signature)(l, epp, eh)) != 0) 98 return error; 99 100 #ifdef ELF_MD_PROBE_FUNC 101 if ((error = ELF_MD_PROBE_FUNC(l, epp, eh, itp, pos)) != 0) 102 return error; 103 #elif defined(ELF_INTERP_NON_RELOCATABLE) 104 *pos = ELF_LINK_ADDR; 105 #endif 106 107 return ELFNAME2(netbsd32,probe_noteless)(l, epp, eh, itp, pos); 108 } 109 110 int 111 ELFNAME2(netbsd32,probe_noteless)(struct lwp *l, struct exec_package *epp, 112 void *eh, char *itp, vaddr_t *pos) 113 { 114 if (itp && epp->ep_interp == NULL) { 115 extern const char machine32[]; 116 (void)compat_elf_check_interp(epp, itp, machine32); 117 } 118 epp->ep_flags |= EXEC_32; 119 epp->ep_vm_minaddr = VM_MIN_ADDRESS; 120 epp->ep_vm_maxaddr = USRSTACK32; 121 #ifdef ELF_INTERP_NON_RELOCATABLE 122 *pos = ELF_LINK_ADDR; 123 #endif 124 return 0; 125 } 126 127 /* round up and down to page boundaries. */ 128 #define ELF_ROUND(a, b) (((a) + (b) - 1) & ~((b) - 1)) 129 #define ELF_TRUNC(a, b) ((a) & ~((b) - 1)) 130 131 /* 132 * Copy arguments onto the stack in the normal way, but add some 133 * extra information in case of dynamic binding. 134 */ 135 int 136 netbsd32_elf32_copyargs(struct lwp *l, struct exec_package *pack, 137 struct ps_strings *arginfo, char **stackp, void *argp) 138 { 139 size_t len; 140 AuxInfo ai[ELF_AUX_ENTRIES], *a; 141 struct elf_args *ap; 142 int error; 143 144 if ((error = netbsd32_copyargs(l, pack, arginfo, stackp, argp)) != 0) 145 return error; 146 147 a = ai; 148 149 /* 150 * Push extra arguments on the stack needed by dynamically 151 * linked binaries 152 */ 153 if ((ap = (struct elf_args *)pack->ep_emul_arg)) { 154 155 a->a_type = AT_PHDR; 156 a->a_v = ap->arg_phaddr; 157 a++; 158 159 a->a_type = AT_PHENT; 160 a->a_v = ap->arg_phentsize; 161 a++; 162 163 a->a_type = AT_PHNUM; 164 a->a_v = ap->arg_phnum; 165 a++; 166 167 a->a_type = AT_PAGESZ; 168 a->a_v = PAGE_SIZE; 169 a++; 170 171 a->a_type = AT_BASE; 172 a->a_v = ap->arg_interp; 173 a++; 174 175 a->a_type = AT_FLAGS; 176 a->a_v = 0; 177 a++; 178 179 a->a_type = AT_ENTRY; 180 a->a_v = ap->arg_entry; 181 a++; 182 183 a->a_type = AT_EUID; 184 a->a_v = kauth_cred_geteuid(l->l_cred); 185 a++; 186 187 a->a_type = AT_RUID; 188 a->a_v = kauth_cred_getuid(l->l_cred); 189 a++; 190 191 a->a_type = AT_EGID; 192 a->a_v = kauth_cred_getegid(l->l_cred); 193 a++; 194 195 a->a_type = AT_RGID; 196 a->a_v = kauth_cred_getgid(l->l_cred); 197 a++; 198 199 free((char *)ap, M_TEMP); 200 pack->ep_emul_arg = NULL; 201 } 202 203 a->a_type = AT_NULL; 204 a->a_v = 0; 205 a++; 206 207 len = (a - ai) * sizeof(AuxInfo); 208 if ((error = copyout(ai, *stackp, len)) != 0) 209 return error; 210 *stackp += len; 211 212 return 0; 213 } 214