svr4_sysvec.c revision 100384
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 * $FreeBSD: head/sys/compat/svr4/svr4_sysvec.c 100384 2002-07-20 02:56:12Z peter $ 31 */ 32 33/* XXX we use functions that might not exist. */ 34#include "opt_compat.h" 35 36#ifndef COMPAT_43 37#error "Unable to compile SVR4-emulator due to missing COMPAT_43 option!" 38#endif 39 40#include <sys/param.h> 41#include <sys/systm.h> 42#include <sys/proc.h> 43#include <sys/sysent.h> 44#include <sys/imgact.h> 45#include <sys/imgact_elf.h> 46#include <sys/socket.h> 47#include <sys/lock.h> 48#include <sys/malloc.h> 49#include <sys/mutex.h> 50#include <sys/namei.h> 51#include <sys/vnode.h> 52#include <sys/module.h> 53#include <vm/vm.h> 54#include <sys/exec.h> 55#include <sys/kernel.h> 56#include <machine/cpu.h> 57#include <netinet/in.h> 58 59#include <compat/svr4/svr4.h> 60#include <compat/svr4/svr4_types.h> 61#include <compat/svr4/svr4_syscall.h> 62#include <compat/svr4/svr4_signal.h> 63#include <compat/svr4/svr4_sockio.h> 64#include <compat/svr4/svr4_socket.h> 65#include <compat/svr4/svr4_errno.h> 66#include <compat/svr4/svr4_proto.h> 67#include <compat/svr4/svr4_siginfo.h> 68#include <compat/svr4/svr4_util.h> 69 70int bsd_to_svr4_errno[ELAST+1] = { 71 0, 72 SVR4_EPERM, 73 SVR4_ENOENT, 74 SVR4_ESRCH, 75 SVR4_EINTR, 76 SVR4_EIO, 77 SVR4_ENXIO, 78 SVR4_E2BIG, 79 SVR4_ENOEXEC, 80 SVR4_EBADF, 81 SVR4_ECHILD, 82 SVR4_EDEADLK, 83 SVR4_ENOMEM, 84 SVR4_EACCES, 85 SVR4_EFAULT, 86 SVR4_ENOTBLK, 87 SVR4_EBUSY, 88 SVR4_EEXIST, 89 SVR4_EXDEV, 90 SVR4_ENODEV, 91 SVR4_ENOTDIR, 92 SVR4_EISDIR, 93 SVR4_EINVAL, 94 SVR4_ENFILE, 95 SVR4_EMFILE, 96 SVR4_ENOTTY, 97 SVR4_ETXTBSY, 98 SVR4_EFBIG, 99 SVR4_ENOSPC, 100 SVR4_ESPIPE, 101 SVR4_EROFS, 102 SVR4_EMLINK, 103 SVR4_EPIPE, 104 SVR4_EDOM, 105 SVR4_ERANGE, 106 SVR4_EAGAIN, 107 SVR4_EINPROGRESS, 108 SVR4_EALREADY, 109 SVR4_ENOTSOCK, 110 SVR4_EDESTADDRREQ, 111 SVR4_EMSGSIZE, 112 SVR4_EPROTOTYPE, 113 SVR4_ENOPROTOOPT, 114 SVR4_EPROTONOSUPPORT, 115 SVR4_ESOCKTNOSUPPORT, 116 SVR4_EOPNOTSUPP, 117 SVR4_EPFNOSUPPORT, 118 SVR4_EAFNOSUPPORT, 119 SVR4_EADDRINUSE, 120 SVR4_EADDRNOTAVAIL, 121 SVR4_ENETDOWN, 122 SVR4_ENETUNREACH, 123 SVR4_ENETRESET, 124 SVR4_ECONNABORTED, 125 SVR4_ECONNRESET, 126 SVR4_ENOBUFS, 127 SVR4_EISCONN, 128 SVR4_ENOTCONN, 129 SVR4_ESHUTDOWN, 130 SVR4_ETOOMANYREFS, 131 SVR4_ETIMEDOUT, 132 SVR4_ECONNREFUSED, 133 SVR4_ELOOP, 134 SVR4_ENAMETOOLONG, 135 SVR4_EHOSTDOWN, 136 SVR4_EHOSTUNREACH, 137 SVR4_ENOTEMPTY, 138 SVR4_EPROCLIM, 139 SVR4_EUSERS, 140 SVR4_EDQUOT, 141 SVR4_ESTALE, 142 SVR4_EREMOTE, 143 SVR4_EBADRPC, 144 SVR4_ERPCMISMATCH, 145 SVR4_EPROGUNAVAIL, 146 SVR4_EPROGMISMATCH, 147 SVR4_EPROCUNAVAIL, 148 SVR4_ENOLCK, 149 SVR4_ENOSYS, 150 SVR4_EFTYPE, 151 SVR4_EAUTH, 152 SVR4_ENEEDAUTH, 153 SVR4_EIDRM, 154 SVR4_ENOMSG, 155}; 156 157 158static int svr4_fixup(register_t **stack_base, struct image_params *imgp); 159 160extern struct sysent svr4_sysent[]; 161#undef szsigcode 162#undef sigcode 163 164extern int svr4_szsigcode; 165extern char svr4_sigcode[]; 166 167struct sysentvec svr4_sysvec = { 168 SVR4_SYS_MAXSYSCALL, 169 svr4_sysent, 170 0xff, 171 SVR4_SIGTBLSZ, 172 bsd_to_svr4_sig, 173 ELAST, /* ELAST */ 174 bsd_to_svr4_errno, 175 0, 176 svr4_fixup, 177 svr4_sendsig, 178 svr4_sigcode, 179 &svr4_szsigcode, 180 NULL, 181 "SVR4", 182 elf32_coredump, 183 NULL, 184 SVR4_MINSIGSTKSZ 185}; 186 187Elf32_Brandinfo svr4_brand = { 188 ELFOSABI_SYSV, 189 EM_386, /* XXX only implemented for x86 so far. */ 190 "SVR4", 191 svr4_emul_path, 192 "/lib/libc.so.1", 193 &svr4_sysvec 194}; 195 196const char svr4_emul_path[] = "/compat/svr4"; 197 198static int 199svr4_fixup(register_t **stack_base, struct image_params *imgp) 200{ 201 Elf32_Auxargs *args = (Elf32_Auxargs *)imgp->auxargs; 202 register_t *pos; 203 204 pos = *stack_base + (imgp->argc + imgp->envc + 2); 205 206 if (args->trace) { 207 AUXARGS_ENTRY(pos, AT_DEBUG, 1); 208 } 209 if (args->execfd != -1) { 210 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd); 211 } 212 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr); 213 AUXARGS_ENTRY(pos, AT_PHENT, args->phent); 214 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum); 215 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz); 216 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags); 217 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry); 218 AUXARGS_ENTRY(pos, AT_BASE, args->base); 219 PROC_LOCK(imgp->proc); 220 AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid); 221 AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid); 222 AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid); 223 AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid); 224 PROC_UNLOCK(imgp->proc); 225 AUXARGS_ENTRY(pos, AT_NULL, 0); 226 227 free(imgp->auxargs, M_TEMP); 228 imgp->auxargs = NULL; 229 230 (*stack_base)--; 231 **stack_base = (int)imgp->argc; 232 return 0; 233} 234 235/* 236 * Search an alternate path before passing pathname arguments on 237 * to system calls. Useful for keeping a separate 'emulation tree'. 238 * 239 * If cflag is set, we check if an attempt can be made to create 240 * the named file, i.e. we check if the directory it should 241 * be in exists. 242 * 243 * Code shamelessly stolen by Mark Newton from IBCS2 emulation code. 244 */ 245int 246svr4_emul_find(td, sgp, prefix, path, pbuf, cflag) 247 struct thread *td; 248 caddr_t *sgp; /* Pointer to stackgap memory */ 249 const char *prefix; 250 char *path; 251 char **pbuf; 252 int cflag; 253{ 254 struct nameidata nd; 255 struct nameidata ndroot; 256 struct vattr vat; 257 struct vattr vatroot; 258 int error; 259 char *ptr, *buf, *cp; 260 size_t sz, len; 261 262 buf = (char *) malloc(MAXPATHLEN, M_TEMP, M_WAITOK); 263 *pbuf = path; 264 265 for (ptr = buf; (*ptr = *prefix) != '\0'; ptr++, prefix++) 266 continue; 267 268 sz = MAXPATHLEN - (ptr - buf); 269 270 /* 271 * If sgp is not given then the path is already in kernel space 272 */ 273 if (sgp == NULL) 274 error = copystr(path, ptr, sz, &len); 275 else 276 error = copyinstr(path, ptr, sz, &len); 277 278 if (error) { 279 free(buf, M_TEMP); 280 return error; 281 } 282 283 if (*ptr != '/') { 284 free(buf, M_TEMP); 285 return EINVAL; 286 } 287 288 /* 289 * We know that there is a / somewhere in this pathname. 290 * Search backwards for it, to find the file's parent dir 291 * to see if it exists in the alternate tree. If it does, 292 * and we want to create a file (cflag is set). We don't 293 * need to worry about the root comparison in this case. 294 */ 295 296 if (cflag) { 297 for (cp = &ptr[len] - 1; *cp != '/'; cp--); 298 *cp = '\0'; 299 300 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, buf, td); 301 302 if ((error = namei(&nd)) != 0) { 303 free(buf, M_TEMP); 304 return error; 305 } 306 NDFREE(&nd, NDF_ONLY_PNBUF); 307 308 *cp = '/'; 309 } 310 else { 311 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, buf, td); 312 313 if ((error = namei(&nd)) != 0) { 314 free(buf, M_TEMP); 315 return error; 316 } 317 NDFREE(&nd, NDF_ONLY_PNBUF); 318 319 /* 320 * We now compare the vnode of the svr4_root to the one 321 * vnode asked. If they resolve to be the same, then we 322 * ignore the match so that the real root gets used. 323 * This avoids the problem of traversing "../.." to find the 324 * root directory and never finding it, because "/" resolves 325 * to the emulation root directory. This is expensive :-( 326 */ 327 NDINIT(&ndroot, LOOKUP, FOLLOW, UIO_SYSSPACE, svr4_emul_path, 328 td); 329 330 if ((error = namei(&ndroot)) != 0) { 331 /* Cannot happen! */ 332 free(buf, M_TEMP); 333 vrele(nd.ni_vp); 334 return error; 335 } 336 NDFREE(&ndroot, NDF_ONLY_PNBUF); 337 338 if ((error = VOP_GETATTR(nd.ni_vp, &vat, td->td_ucred, td)) != 0) { 339 goto done; 340 } 341 342 if ((error = VOP_GETATTR(ndroot.ni_vp, &vatroot, td->td_ucred, td)) 343 != 0) { 344 goto done; 345 } 346 347 if (vat.va_fsid == vatroot.va_fsid && 348 vat.va_fileid == vatroot.va_fileid) { 349 error = ENOENT; 350 goto done; 351 } 352 353 } 354 if (sgp == NULL) 355 *pbuf = buf; 356 else { 357 sz = &ptr[len] - buf; 358 *pbuf = stackgap_alloc(sgp, sz + 1); 359 error = copyout(buf, *pbuf, sz); 360 free(buf, M_TEMP); 361 } 362 363 364done: 365 vrele(nd.ni_vp); 366 if (!cflag) 367 vrele(ndroot.ni_vp); 368 return error; 369} 370 371static int 372svr4_elf_modevent(module_t mod, int type, void *data) 373{ 374 int error; 375 376 error = 0; 377 378 switch(type) { 379 case MOD_LOAD: 380 if (elf32_insert_brand_entry(&svr4_brand) < 0) 381 error = EINVAL; 382 if (error) 383 printf("cannot insert svr4 elf brand handler\n"); 384 else if (bootverbose) 385 printf("svr4 ELF exec handler installed\n"); 386 break; 387 case MOD_UNLOAD: 388 /* Only allow the emulator to be removed if it isn't in use. */ 389 if (elf32_brand_inuse(&svr4_brand) != 0) { 390 error = EBUSY; 391 } else if (elf32_remove_brand_entry(&svr4_brand) < 0) { 392 error = EINVAL; 393 } 394 395 if (error) 396 printf("Could not deinstall ELF interpreter entry (error %d)\n", 397 error); 398 else if (bootverbose) 399 printf("svr4 ELF exec handler removed\n"); 400 break; 401 default: 402 break; 403 } 404 return error; 405} 406 407static moduledata_t svr4_elf_mod = { 408 "svr4elf", 409 svr4_elf_modevent, 410 0 411}; 412DECLARE_MODULE(svr4elf, svr4_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY); 413MODULE_DEPEND(svr4elf, streams, 1, 1, 1); 414