1 /* $NetBSD: netbsd32_exec_elf32.c,v 1.40 2016/08/06 15:13:13 maxv 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 1.40 2016/08/06 15:13:13 maxv 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/vnode.h> 68 #include <sys/exec.h> 69 #include <sys/exec_elf.h> 70 #include <sys/resourcevar.h> 71 #include <sys/signal.h> 72 #include <sys/signalvar.h> 73 #include <sys/kauth.h> 74 #include <sys/namei.h> 75 76 #include <compat/common/compat_util.h> 77 78 #include <compat/netbsd32/netbsd32.h> 79 #include <compat/netbsd32/netbsd32_exec.h> 80 81 #include <machine/netbsd32_machdep.h> 82 83 int ELFNAME2(netbsd32,probe_noteless)(struct lwp *, struct exec_package *epp, 84 void *eh, char *itp, vaddr_t *pos); 85 extern int ELFNAME2(netbsd,signature)(struct lwp *, struct exec_package *, 86 Elf_Ehdr *); 87 88 int 89 ELFNAME2(netbsd32,probe)(struct lwp *l, struct exec_package *epp, 90 void *eh, char *itp, vaddr_t *pos) 91 { 92 int error; 93 94 if ((error = ELFNAME2(netbsd,signature)(l, epp, eh)) != 0) 95 return error; 96 97 #ifdef ELF_MD_PROBE_FUNC 98 if ((error = ELF_MD_PROBE_FUNC(l, epp, eh, itp, pos)) != 0) 99 return error; 100 #elif defined(ELF_INTERP_NON_RELOCATABLE) 101 *pos = ELF_LINK_ADDR; 102 #endif 103 104 return ELFNAME2(netbsd32,probe_noteless)(l, epp, eh, itp, pos); 105 } 106 107 int 108 ELFNAME2(netbsd32,probe_noteless)(struct lwp *l, struct exec_package *epp, 109 void *eh, char *itp, vaddr_t *pos) 110 { 111 if (itp && epp->ep_interp == NULL) { 112 extern const char machine32[]; 113 (void)compat_elf_check_interp(epp, itp, machine32); 114 } 115 #ifdef _LP64 116 epp->ep_flags |= EXEC_32 | EXEC_FORCEAUX; 117 #endif 118 epp->ep_vm_minaddr = exec_vm_minaddr(VM_MIN_ADDRESS); 119 epp->ep_vm_maxaddr = USRSTACK32; 120 #ifdef ELF_INTERP_NON_RELOCATABLE 121 *pos = ELF_LINK_ADDR; 122 #endif 123 return 0; 124 } 125 126 /* 127 * Copy arguments onto the stack in the normal way, but add some 128 * extra information in case of dynamic binding. 129 */ 130 int 131 netbsd32_elf32_copyargs(struct lwp *l, struct exec_package *pack, 132 struct ps_strings *arginfo, char **stackp, void *argp) 133 { 134 size_t len; 135 AuxInfo ai[ELF_AUX_ENTRIES], *a; 136 struct elf_args *ap; 137 int error; 138 139 if ((error = netbsd32_copyargs(l, pack, arginfo, stackp, argp)) != 0) 140 return error; 141 142 a = ai; 143 144 memset(ai, 0, sizeof(ai)); 145 146 /* 147 * Push extra arguments on the stack needed by dynamically 148 * linked binaries 149 */ 150 if ((ap = (struct elf_args *)pack->ep_emul_arg)) { 151 152 a->a_type = AT_PHDR; 153 a->a_v = ap->arg_phaddr; 154 a++; 155 156 a->a_type = AT_PHENT; 157 a->a_v = ap->arg_phentsize; 158 a++; 159 160 a->a_type = AT_PHNUM; 161 a->a_v = ap->arg_phnum; 162 a++; 163 164 a->a_type = AT_PAGESZ; 165 a->a_v = PAGE_SIZE; 166 a++; 167 168 a->a_type = AT_BASE; 169 a->a_v = ap->arg_interp; 170 a++; 171 172 a->a_type = AT_FLAGS; 173 a->a_v = 0; 174 a++; 175 176 a->a_type = AT_ENTRY; 177 a->a_v = ap->arg_entry; 178 a++; 179 180 a->a_type = AT_EUID; 181 a->a_v = kauth_cred_geteuid(l->l_cred); 182 a++; 183 184 a->a_type = AT_RUID; 185 a->a_v = kauth_cred_getuid(l->l_cred); 186 a++; 187 188 a->a_type = AT_EGID; 189 a->a_v = kauth_cred_getegid(l->l_cred); 190 a++; 191 192 a->a_type = AT_RGID; 193 a->a_v = kauth_cred_getgid(l->l_cred); 194 a++; 195 196 exec_free_emul_arg(pack); 197 } 198 199 a->a_type = AT_NULL; 200 a->a_v = 0; 201 a++; 202 203 len = (a - ai) * sizeof(AuxInfo); 204 if ((error = copyout(ai, *stackp, len)) != 0) 205 return error; 206 *stackp += len; 207 208 return 0; 209 } 210