linux32_exec_elf32.c revision 1.12.8.2
1 /* $NetBSD: linux32_exec_elf32.c,v 1.12.8.2 2014/05/22 11:40:17 yamt 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 1.12.8.2 2014/05/22 11:40:17 yamt 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 #include <sys/cprng.h> 50 51 #include <compat/linux/common/linux_exec.h> 52 #include <compat/netbsd32/netbsd32.h> 53 #include <compat/netbsd32/netbsd32_exec.h> 54 #include <compat/linux32/common/linux32_exec.h> 55 56 #include <machine/cpuvar.h> 57 #include <machine/frame.h> 58 59 #ifdef DEBUG_LINUX 60 #define DPRINTF(a) uprintf a 61 #else 62 #define DPRINTF(a) 63 #endif 64 65 int linux32_copyinargs(struct exec_package *, struct ps_strings *, 66 void *, size_t, const void *, const void *); 67 68 int 69 ELFNAME2(linux32,probe)(struct lwp *l, struct exec_package *epp, 70 void *eh, char *itp, vaddr_t *pos) 71 { 72 int error; 73 74 if (((error = ELFNAME2(linux,signature)(l, epp, eh, itp)) != 0) && 75 #ifdef LINUX32_GCC_SIGNATURE 76 ((error = ELFNAME2(linux,gcc_signature)(l, epp, eh)) != 0) && 77 #endif 78 #ifdef LINUX32_ATEXIT_SIGNATURE 79 ((error = ELFNAME2(linux,atexit_signature)(l, epp, eh)) != 0) && 80 #endif 81 #ifdef LINUX32_DEBUGLINK_SIGNATURE 82 ((error = ELFNAME2(linux,debuglink_signature)(l, epp, eh)) != 0) && 83 #endif 84 1) 85 return error; 86 87 if (itp) { 88 if ((error = emul_find_interp(l, epp, itp))) 89 return (error); 90 } 91 #if 0 92 DPRINTF(("linux32_probe: returning 0\n")); 93 #endif 94 95 epp->ep_flags |= EXEC_32 | EXEC_FORCEAUX; 96 epp->ep_vm_minaddr = VM_MIN_ADDRESS; 97 epp->ep_vm_maxaddr = USRSTACK32; 98 99 return 0; 100 } 101 102 /* 103 * Copy arguments onto the stack in the normal way, but add some 104 * extra information in case of dynamic binding. 105 */ 106 int 107 linux32_elf32_copyargs(struct lwp *l, struct exec_package *pack, 108 struct ps_strings *arginfo, char **stackp, void *argp) 109 { 110 Aux32Info ai[LINUX32_ELF_AUX_ENTRIES], *a; 111 uint32_t randbytes[4]; 112 struct elf_args *ap; 113 struct vattr *vap; 114 size_t len; 115 int error; 116 117 if ((error = netbsd32_copyargs(l, pack, arginfo, stackp, argp)) != 0) 118 return error; 119 120 a = ai; 121 122 /* 123 * Push extra arguments on the stack needed by dynamically 124 * linked binaries and static binaries as well. 125 */ 126 127 a->a_type = AT_PAGESZ; 128 a->a_v = PAGE_SIZE; 129 a++; 130 131 if ((ap = (struct elf_args *)pack->ep_emul_arg)) { 132 133 a->a_type = AT_PHDR; 134 a->a_v = ap->arg_phaddr; 135 a++; 136 137 a->a_type = AT_PHENT; 138 a->a_v = ap->arg_phentsize; 139 a++; 140 141 a->a_type = AT_PHNUM; 142 a->a_v = ap->arg_phnum; 143 a++; 144 145 a->a_type = AT_BASE; 146 a->a_v = ap->arg_interp; 147 a++; 148 149 a->a_type = AT_FLAGS; 150 a->a_v = 0; 151 a++; 152 153 a->a_type = AT_ENTRY; 154 a->a_v = ap->arg_entry; 155 a++; 156 157 exec_free_emul_arg(pack); 158 } 159 160 /* Linux-specific items */ 161 a->a_type = LINUX_AT_CLKTCK; 162 a->a_v = hz; 163 a++; 164 165 vap = pack->ep_vap; 166 167 a->a_type = LINUX_AT_UID; 168 a->a_v = kauth_cred_getuid(l->l_cred); 169 a++; 170 171 a->a_type = LINUX_AT_EUID; 172 a->a_v = ((vap->va_mode & S_ISUID) ? 173 vap->va_uid : kauth_cred_geteuid(l->l_cred)); 174 a++; 175 176 a->a_type = LINUX_AT_GID; 177 a->a_v = kauth_cred_getgid(l->l_cred); 178 a++; 179 180 a->a_type = LINUX_AT_EGID; 181 a->a_v = ((vap->va_mode & S_ISGID) ? 182 vap->va_gid : kauth_cred_getegid(l->l_cred)); 183 a++; 184 185 a->a_type = LINUX_AT_SECURE; 186 a->a_v = 0; 187 a++; 188 189 a->a_type = LINUX_AT_RANDOM; 190 a->a_v = NETBSD32PTR32I(*stackp); 191 a++; 192 193 #if 0 194 /* XXX: increase LINUX32_ELF_AUX_ENTRIES if we enable those things */ 195 196 a->a_type = LINUX_AT_SYSINFO; 197 a->a_v = NETBSD32PTR32I(&esdp->kernel_vsyscall[0]); 198 a++; 199 200 a->a_type = LINUX_AT_SYSINFO_EHDR; 201 a->a_v = NETBSD32PTR32I(&esdp->elfhdr); 202 a++; 203 204 a->a_type = LINUX_AT_HWCAP; 205 a->a_v = LINUX32_CPUCAP; 206 a++; 207 208 a->a_type = LINUX_AT_PLATFORM; 209 a->a_v = NETBSD32PTR32I(&esdp->hw_platform[0]); 210 a++; 211 #endif 212 213 a->a_type = AT_NULL; 214 a->a_v = 0; 215 a++; 216 217 randbytes[0] = cprng_strong32(); 218 randbytes[1] = cprng_strong32(); 219 randbytes[2] = cprng_strong32(); 220 randbytes[3] = cprng_strong32(); 221 222 len = sizeof(randbytes); 223 if ((error = copyout(randbytes, *stackp, len)) != 0) 224 return error; 225 *stackp += len; 226 227 #if 0 228 memcpy(esd.kernel_vsyscall, linux32_kernel_vsyscall, 229 sizeof(linux32_kernel_vsyscall)); 230 231 memcpy(&esd.elfhdr, eh, sizeof(*eh)); 232 233 strcpy(esd.hw_platform, LINUX32_PLATFORM); 234 235 /* 236 * Copy out the ELF auxiliary table and hw platform name 237 */ 238 if ((error = copyout(&esd, esdp, sizeof(esd))) != 0) 239 return error; 240 *stackp += sizeof(esd); 241 #endif 242 243 len = (a - ai) * sizeof(Aux32Info); 244 KASSERT(len <= LINUX32_ELF_AUX_ENTRIES * sizeof(Aux32Info)); 245 if ((error = copyout(ai, *stackp, len)) != 0) 246 return error; 247 *stackp += len; 248 249 return 0; 250 } 251
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