1 /* $NetBSD: linux32_exec_elf32.c,v 1.13 2012/02/03 20:11:54 matt Exp $ */ 2 3 /*- 4 * Copyright (c) 1995, 1998, 2000, 2001,2006 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Christos Zoulas, Frank van der Linden, Eric Haszlakiewicz and 9 * Emmanuel Dreyfus. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #include <sys/cdefs.h> 34 __KERNEL_RCSID(0, "$NetBSD: linux32_exec_elf32.c,v 1.13 2012/02/03 20:11:54 matt Exp $"); 35 36 #define ELFSIZE 32 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/proc.h> 41 #include <sys/vnode.h> 42 #include <sys/exec.h> 43 #include <sys/exec_elf.h> 44 #include <sys/kauth.h> 45 #include <sys/kernel.h> 46 #include <sys/resourcevar.h> 47 #include <sys/signal.h> 48 #include <sys/signalvar.h> 49 50 #include <compat/linux/common/linux_exec.h> 51 #include <compat/netbsd32/netbsd32.h> 52 #include <compat/netbsd32/netbsd32_exec.h> 53 #include <compat/linux32/common/linux32_exec.h> 54 55 #include <machine/cpuvar.h> 56 #include <machine/frame.h> 57 58 #ifdef DEBUG_LINUX 59 #define DPRINTF(a) uprintf a 60 #else 61 #define DPRINTF(a) 62 #endif 63 64 int linux32_copyinargs(struct exec_package *, struct ps_strings *, 65 void *, size_t, const void *, const void *); 66 67 int 68 ELFNAME2(linux32,probe)(struct lwp *l, struct exec_package *epp, 69 void *eh, char *itp, vaddr_t *pos) 70 { 71 int error; 72 73 if (((error = ELFNAME2(linux,signature)(l, epp, eh, itp)) != 0) && 74 #ifdef LINUX32_GCC_SIGNATURE 75 ((error = ELFNAME2(linux,gcc_signature)(l, epp, eh)) != 0) && 76 #endif 77 #ifdef LINUX32_ATEXIT_SIGNATURE 78 ((error = ELFNAME2(linux,atexit_signature)(l, epp, eh)) != 0) && 79 #endif 80 #ifdef LINUX32_DEBUGLINK_SIGNATURE 81 ((error = ELFNAME2(linux,debuglink_signature)(l, epp, eh)) != 0) && 82 #endif 83 1) 84 return error; 85 86 if (itp) { 87 if ((error = emul_find_interp(l, epp, itp))) 88 return (error); 89 } 90 #if 0 91 DPRINTF(("linux32_probe: returning 0\n")); 92 #endif 93 94 epp->ep_flags |= EXEC_32 | EXEC_FORCEAUX; 95 epp->ep_vm_minaddr = VM_MIN_ADDRESS; 96 epp->ep_vm_maxaddr = USRSTACK32; 97 98 return 0; 99 } 100 101 /* 102 * Copy arguments onto the stack in the normal way, but add some 103 * extra information in case of dynamic binding. 104 */ 105 int 106 linux32_elf32_copyargs(struct lwp *l, struct exec_package *pack, 107 struct ps_strings *arginfo, char **stackp, void *argp) 108 { 109 Aux32Info ai[LINUX32_ELF_AUX_ENTRIES], *a; 110 struct elf_args *ap; 111 struct vattr *vap; 112 size_t len; 113 int error; 114 115 if ((error = netbsd32_copyargs(l, pack, arginfo, stackp, argp)) != 0) 116 return error; 117 118 a = ai; 119 120 /* 121 * Push extra arguments on the stack needed by dynamically 122 * linked binaries and static binaries as well. 123 */ 124 125 a->a_type = AT_PAGESZ; 126 a->a_v = PAGE_SIZE; 127 a++; 128 129 if ((ap = (struct elf_args *)pack->ep_emul_arg)) { 130 131 a->a_type = AT_PHDR; 132 a->a_v = ap->arg_phaddr; 133 a++; 134 135 a->a_type = AT_PHENT; 136 a->a_v = ap->arg_phentsize; 137 a++; 138 139 a->a_type = AT_PHNUM; 140 a->a_v = ap->arg_phnum; 141 a++; 142 143 a->a_type = AT_BASE; 144 a->a_v = ap->arg_interp; 145 a++; 146 147 a->a_type = AT_FLAGS; 148 a->a_v = 0; 149 a++; 150 151 a->a_type = AT_ENTRY; 152 a->a_v = ap->arg_entry; 153 a++; 154 155 exec_free_emul_arg(pack); 156 } 157 158 /* Linux-specific items */ 159 a->a_type = LINUX_AT_CLKTCK; 160 a->a_v = hz; 161 a++; 162 163 vap = pack->ep_vap; 164 165 a->a_type = LINUX_AT_UID; 166 a->a_v = kauth_cred_getuid(l->l_cred); 167 a++; 168 169 a->a_type = LINUX_AT_EUID; 170 a->a_v = ((vap->va_mode & S_ISUID) ? 171 vap->va_uid : kauth_cred_geteuid(l->l_cred)); 172 a++; 173 174 a->a_type = LINUX_AT_GID; 175 a->a_v = kauth_cred_getgid(l->l_cred); 176 a++; 177 178 a->a_type = LINUX_AT_EGID; 179 a->a_v = ((vap->va_mode & S_ISGID) ? 180 vap->va_gid : kauth_cred_getegid(l->l_cred)); 181 a++; 182 183 a->a_type = LINUX_AT_SECURE; 184 a->a_v = 0; 185 a++; 186 187 #if 0 188 a->a_type = LINUX_AT_SYSINFO; 189 a->a_v = NETBSD32PTR32I(&esdp->kernel_vsyscall[0]); 190 a++; 191 192 a->a_type = LINUX_AT_SYSINFO_EHDR; 193 a->a_v = NETBSD32PTR32I(&esdp->elfhdr); 194 a++; 195 196 a->a_type = LINUX_AT_HWCAP; 197 a->a_v = LINUX32_CPUCAP; 198 a++; 199 200 a->a_type = LINUX_AT_PLATFORM; 201 a->a_v = NETBSD32PTR32I(&esdp->hw_platform[0]); 202 a++; 203 #endif 204 205 a->a_type = AT_NULL; 206 a->a_v = 0; 207 a++; 208 209 #if 0 210 memcpy(esd.kernel_vsyscall, linux32_kernel_vsyscall, 211 sizeof(linux32_kernel_vsyscall)); 212 213 memcpy(&esd.elfhdr, eh, sizeof(*eh)); 214 215 strcpy(esd.hw_platform, LINUX32_PLATFORM); 216 217 /* 218 * Copy out the ELF auxiliary table and hw platform name 219 */ 220 if ((error = copyout(&esd, esdp, sizeof(esd))) != 0) 221 return error; 222 *stackp += sizeof(esd); 223 #endif 224 225 len = (a - ai) * sizeof(AuxInfo); 226 if ((error = copyout(ai, *stackp, len)) != 0) 227 return error; 228 *stackp += len; 229 230 return 0; 231 } 232