svr4_sysvec.c revision 160558
1/*- 2 * Copyright (c) 1998 Mark Newton 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by Christos Zoulas. 16 * 4. The name of the author may not be used to endorse or promote products 17 * derived from this software without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31#include <sys/cdefs.h> 32__FBSDID("$FreeBSD: head/sys/compat/svr4/svr4_sysvec.c 160558 2006-07-21 20:40:13Z jhb $"); 33 34/* XXX we use functions that might not exist. */ 35#include "opt_compat.h" 36 37#ifndef COMPAT_43 38#error "Unable to compile SVR4-emulator due to missing COMPAT_43 option!" 39#endif 40 41#include <sys/param.h> 42#include <sys/systm.h> 43#include <sys/proc.h> 44#include <sys/sysent.h> 45#include <sys/imgact.h> 46#include <sys/imgact_elf.h> 47#include <sys/lock.h> 48#include <sys/malloc.h> 49#include <sys/module.h> 50#include <sys/mutex.h> 51#include <sys/namei.h> 52#include <sys/socket.h> 53#include <sys/syscallsubr.h> 54#include <sys/vnode.h> 55#include <vm/vm.h> 56#include <sys/exec.h> 57#include <sys/kernel.h> 58#include <machine/cpu.h> 59#include <netinet/in.h> 60 61#include <compat/svr4/svr4.h> 62#include <compat/svr4/svr4_types.h> 63#include <compat/svr4/svr4_syscall.h> 64#include <compat/svr4/svr4_signal.h> 65#include <compat/svr4/svr4_socket.h> 66#include <compat/svr4/svr4_sockio.h> 67#include <compat/svr4/svr4_errno.h> 68#include <compat/svr4/svr4_proto.h> 69#include <compat/svr4/svr4_siginfo.h> 70#include <compat/svr4/svr4_util.h> 71 72int bsd_to_svr4_errno[ELAST+1] = { 73 0, 74 SVR4_EPERM, 75 SVR4_ENOENT, 76 SVR4_ESRCH, 77 SVR4_EINTR, 78 SVR4_EIO, 79 SVR4_ENXIO, 80 SVR4_E2BIG, 81 SVR4_ENOEXEC, 82 SVR4_EBADF, 83 SVR4_ECHILD, 84 SVR4_EDEADLK, 85 SVR4_ENOMEM, 86 SVR4_EACCES, 87 SVR4_EFAULT, 88 SVR4_ENOTBLK, 89 SVR4_EBUSY, 90 SVR4_EEXIST, 91 SVR4_EXDEV, 92 SVR4_ENODEV, 93 SVR4_ENOTDIR, 94 SVR4_EISDIR, 95 SVR4_EINVAL, 96 SVR4_ENFILE, 97 SVR4_EMFILE, 98 SVR4_ENOTTY, 99 SVR4_ETXTBSY, 100 SVR4_EFBIG, 101 SVR4_ENOSPC, 102 SVR4_ESPIPE, 103 SVR4_EROFS, 104 SVR4_EMLINK, 105 SVR4_EPIPE, 106 SVR4_EDOM, 107 SVR4_ERANGE, 108 SVR4_EAGAIN, 109 SVR4_EINPROGRESS, 110 SVR4_EALREADY, 111 SVR4_ENOTSOCK, 112 SVR4_EDESTADDRREQ, 113 SVR4_EMSGSIZE, 114 SVR4_EPROTOTYPE, 115 SVR4_ENOPROTOOPT, 116 SVR4_EPROTONOSUPPORT, 117 SVR4_ESOCKTNOSUPPORT, 118 SVR4_EOPNOTSUPP, 119 SVR4_EPFNOSUPPORT, 120 SVR4_EAFNOSUPPORT, 121 SVR4_EADDRINUSE, 122 SVR4_EADDRNOTAVAIL, 123 SVR4_ENETDOWN, 124 SVR4_ENETUNREACH, 125 SVR4_ENETRESET, 126 SVR4_ECONNABORTED, 127 SVR4_ECONNRESET, 128 SVR4_ENOBUFS, 129 SVR4_EISCONN, 130 SVR4_ENOTCONN, 131 SVR4_ESHUTDOWN, 132 SVR4_ETOOMANYREFS, 133 SVR4_ETIMEDOUT, 134 SVR4_ECONNREFUSED, 135 SVR4_ELOOP, 136 SVR4_ENAMETOOLONG, 137 SVR4_EHOSTDOWN, 138 SVR4_EHOSTUNREACH, 139 SVR4_ENOTEMPTY, 140 SVR4_EPROCLIM, 141 SVR4_EUSERS, 142 SVR4_EDQUOT, 143 SVR4_ESTALE, 144 SVR4_EREMOTE, 145 SVR4_EBADRPC, 146 SVR4_ERPCMISMATCH, 147 SVR4_EPROGUNAVAIL, 148 SVR4_EPROGMISMATCH, 149 SVR4_EPROCUNAVAIL, 150 SVR4_ENOLCK, 151 SVR4_ENOSYS, 152 SVR4_EFTYPE, 153 SVR4_EAUTH, 154 SVR4_ENEEDAUTH, 155 SVR4_EIDRM, 156 SVR4_ENOMSG, 157}; 158 159 160static int svr4_fixup(register_t **stack_base, struct image_params *imgp); 161 162extern struct sysent svr4_sysent[]; 163#undef szsigcode 164#undef sigcode 165 166extern int svr4_szsigcode; 167extern char svr4_sigcode[]; 168 169struct sysentvec svr4_sysvec = { 170 SVR4_SYS_MAXSYSCALL, 171 svr4_sysent, 172 0xff, 173 SVR4_NSIG-1, /* NB: signal trans table indexed with signno-1 */ 174 bsd_to_svr4_sig+1, 175 ELAST, /* ELAST */ 176 bsd_to_svr4_errno, 177 NULL, 178 svr4_fixup, 179 svr4_sendsig, 180 svr4_sigcode, 181 &svr4_szsigcode, 182 NULL, 183 "SVR4", 184 elf32_coredump, 185 NULL, 186 SVR4_MINSIGSTKSZ, 187 PAGE_SIZE, 188 VM_MIN_ADDRESS, 189 VM_MAXUSER_ADDRESS, 190 USRSTACK, 191 PS_STRINGS, 192 VM_PROT_ALL, 193 exec_copyout_strings, 194 exec_setregs, 195 NULL 196}; 197 198const char svr4_emul_path[] = "/compat/svr4"; 199 200Elf32_Brandinfo svr4_brand = { 201 ELFOSABI_SYSV, 202 EM_386, /* XXX only implemented for x86 so far. */ 203 "SVR4", 204 svr4_emul_path, 205 "/lib/libc.so.1", 206 &svr4_sysvec, 207 NULL, 208}; 209 210static int 211svr4_fixup(register_t **stack_base, struct image_params *imgp) 212{ 213 Elf32_Auxargs *args; 214 register_t *pos; 215 216 KASSERT(curthread->td_proc == imgp->proc && 217 (curthread->td_proc->p_flag & P_SA) == 0, 218 ("unsafe svr4_fixup(), should be curproc")); 219 args = (Elf32_Auxargs *)imgp->auxargs; 220 pos = *stack_base + (imgp->args->argc + imgp->args->envc + 2); 221 222 if (args->trace) 223 AUXARGS_ENTRY(pos, AT_DEBUG, 1); 224 if (args->execfd != -1) 225 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd); 226 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr); 227 AUXARGS_ENTRY(pos, AT_PHENT, args->phent); 228 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum); 229 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz); 230 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags); 231 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry); 232 AUXARGS_ENTRY(pos, AT_BASE, args->base); 233 AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid); 234 AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid); 235 AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid); 236 AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid); 237 AUXARGS_ENTRY(pos, AT_NULL, 0); 238 239 free(imgp->auxargs, M_TEMP); 240 imgp->auxargs = NULL; 241 242 (*stack_base)--; 243 **stack_base = (register_t)imgp->args->argc; 244 return 0; 245} 246 247/* 248 * Search an alternate path before passing pathname arguments on 249 * to system calls. Useful for keeping a separate 'emulation tree'. 250 * 251 * If cflag is set, we check if an attempt can be made to create 252 * the named file, i.e. we check if the directory it should 253 * be in exists. 254 */ 255int 256svr4_emul_find(struct thread *td, char *path, enum uio_seg pathseg, 257 char **pbuf, int create) 258{ 259 260 return (kern_alternate_path(td, svr4_emul_path, path, pathseg, pbuf, 261 create)); 262} 263 264static int 265svr4_elf_modevent(module_t mod, int type, void *data) 266{ 267 int error; 268 269 error = 0; 270 271 switch(type) { 272 case MOD_LOAD: 273 if (elf32_insert_brand_entry(&svr4_brand) < 0) { 274 printf("cannot insert svr4 elf brand handler\n"); 275 error = EINVAL; 276 break; 277 } 278 if (bootverbose) 279 printf("svr4 ELF exec handler installed\n"); 280 svr4_sockcache_init(); 281 break; 282 case MOD_UNLOAD: 283 /* Only allow the emulator to be removed if it isn't in use. */ 284 if (elf32_brand_inuse(&svr4_brand) != 0) { 285 error = EBUSY; 286 } else if (elf32_remove_brand_entry(&svr4_brand) < 0) { 287 error = EINVAL; 288 } 289 290 if (error) { 291 printf("Could not deinstall ELF interpreter entry (error %d)\n", 292 error); 293 break; 294 } 295 if (bootverbose) 296 printf("svr4 ELF exec handler removed\n"); 297 svr4_sockcache_destroy(); 298 break; 299 default: 300 return (EOPNOTSUPP); 301 break; 302 } 303 return error; 304} 305 306static moduledata_t svr4_elf_mod = { 307 "svr4elf", 308 svr4_elf_modevent, 309 0 310}; 311DECLARE_MODULE(svr4elf, svr4_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY); 312MODULE_DEPEND(svr4elf, streams, 1, 1, 1); 313