1 /* $NetBSD: linux_misc.c,v 1.61 1999/10/05 09:22:04 tron Exp $ */ 2 3 /*- 4 * Copyright (c) 1995, 1998, 1999 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Frank van der Linden and Eric Haszlakiewicz; by Jason R. Thorpe 9 * of the Numerical Aerospace Simulation Facility, NASA Ames Research Center. 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 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the NetBSD 22 * Foundation, Inc. and its contributors. 23 * 4. Neither the name of The NetBSD Foundation nor the names of its 24 * contributors may be used to endorse or promote products derived 25 * from this software without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 28 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 30 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 37 * POSSIBILITY OF SUCH DAMAGE. 38 */ 39 40 /* 41 * Linux compatibility module. Try to deal with various Linux system calls. 42 */ 43 44 /* 45 * These functions have been moved to multiarch to allow 46 * selection of which machines include them to be 47 * determined by the individual files.linux_<arch> files. 48 * 49 * Function in multiarch: 50 * linux_sys_break : linux_break.c 51 * linux_sys_alarm : linux_misc_notalpha.c 52 * linux_sys_getresgid : linux_misc_notalpha.c 53 * linux_sys_nice : linux_misc_notalpha.c 54 * linux_sys_readdir : linux_misc_notalpha.c 55 * linux_sys_setresgid : linux_misc_notalpha.c 56 * linux_sys_time : linux_misc_notalpha.c 57 * linux_sys_utime : linux_misc_notalpha.c 58 * linux_sys_waitpid : linux_misc_notalpha.c 59 * linux_sys_old_mmap : linux_oldmmap.c 60 * linux_sys_oldolduname : linux_oldolduname.c 61 * linux_sys_oldselect : linux_oldselect.c 62 * linux_sys_olduname : linux_olduname.c 63 * linux_sys_pipe : linux_pipe.c 64 */ 65 66 #include <sys/param.h> 67 #include <sys/systm.h> 68 #include <sys/namei.h> 69 #include <sys/proc.h> 70 #include <sys/dirent.h> 71 #include <sys/file.h> 72 #include <sys/stat.h> 73 #include <sys/filedesc.h> 74 #include <sys/ioctl.h> 75 #include <sys/kernel.h> 76 #include <sys/malloc.h> 77 #include <sys/mbuf.h> 78 #include <sys/mman.h> 79 #include <sys/mount.h> 80 #include <sys/ptrace.h> 81 #include <sys/resource.h> 82 #include <sys/resourcevar.h> 83 #include <sys/signal.h> 84 #include <sys/signalvar.h> 85 #include <sys/socket.h> 86 #include <sys/time.h> 87 #include <sys/times.h> 88 #include <sys/vnode.h> 89 #include <sys/uio.h> 90 #include <sys/wait.h> 91 #include <sys/utsname.h> 92 #include <sys/unistd.h> 93 94 #include <sys/syscallargs.h> 95 96 #include <vm/vm.h> 97 #include <vm/vm_param.h> 98 99 #include <compat/linux/common/linux_types.h> 100 #include <compat/linux/common/linux_signal.h> 101 102 #include <compat/linux/linux_syscallargs.h> 103 104 #include <compat/linux/common/linux_fcntl.h> 105 #include <compat/linux/common/linux_mmap.h> 106 #include <compat/linux/common/linux_dirent.h> 107 #include <compat/linux/common/linux_util.h> 108 #include <compat/linux/common/linux_misc.h> 109 110 111 /* Local linux_misc.c functions: */ 112 static void bsd_to_linux_statfs __P((struct statfs *, struct linux_statfs *)); 113 114 /* 115 * The information on a terminated (or stopped) process needs 116 * to be converted in order for Linux binaries to get a valid signal 117 * number out of it. 118 */ 119 void 120 bsd_to_linux_wstat(st) 121 int *st; 122 { 123 124 int sig; 125 126 if (WIFSIGNALED(*st)) { 127 sig = WTERMSIG(*st); 128 if (sig >= 0 && sig < NSIG) 129 *st= (*st& ~0177) | native_to_linux_sig[sig]; 130 } else if (WIFSTOPPED(*st)) { 131 sig = WSTOPSIG(*st); 132 if (sig >= 0 && sig < NSIG) 133 *st = (*st & ~0xff00) | (native_to_linux_sig[sig] << 8); 134 } 135 } 136 137 /* 138 * This is very much the same as waitpid() 139 */ 140 int 141 linux_sys_wait4(p, v, retval) 142 struct proc *p; 143 void *v; 144 register_t *retval; 145 { 146 struct linux_sys_wait4_args /* { 147 syscallarg(int) pid; 148 syscallarg(int *) status; 149 syscallarg(int) options; 150 syscallarg(struct rusage *) rusage; 151 } */ *uap = v; 152 struct sys_wait4_args w4a; 153 int error, *status, tstat, options, linux_options; 154 caddr_t sg; 155 156 if (SCARG(uap, status) != NULL) { 157 sg = stackgap_init(p->p_emul); 158 status = (int *) stackgap_alloc(&sg, sizeof *status); 159 } else 160 status = NULL; 161 162 linux_options = SCARG(uap, options); 163 options = 0; 164 if (linux_options & 165 ~(LINUX_WAIT4_WNOHANG|LINUX_WAIT4_WUNTRACED|LINUX_WAIT4_WCLONE)) 166 return (EINVAL); 167 168 if (linux_options & LINUX_WAIT4_WNOHANG) 169 options |= WNOHANG; 170 if (linux_options & LINUX_WAIT4_WUNTRACED) 171 options |= WUNTRACED; 172 if (linux_options & LINUX_WAIT4_WCLONE) 173 options |= WALTSIG; 174 175 SCARG(&w4a, pid) = SCARG(uap, pid); 176 SCARG(&w4a, status) = status; 177 SCARG(&w4a, options) = options; 178 SCARG(&w4a, rusage) = SCARG(uap, rusage); 179 180 if ((error = sys_wait4(p, &w4a, retval))) 181 return error; 182 183 sigdelset(&p->p_siglist, SIGCHLD); 184 185 if (status != NULL) { 186 if ((error = copyin(status, &tstat, sizeof tstat))) 187 return error; 188 189 bsd_to_linux_wstat(&tstat); 190 return copyout(&tstat, SCARG(uap, status), sizeof tstat); 191 } 192 193 return 0; 194 } 195 196 /* 197 * Linux brk(2). The check if the new address is >= the old one is 198 * done in the kernel in Linux. NetBSD does it in the library. 199 */ 200 int 201 linux_sys_brk(p, v, retval) 202 struct proc *p; 203 void *v; 204 register_t *retval; 205 { 206 struct linux_sys_brk_args /* { 207 syscallarg(char *) nsize; 208 } */ *uap = v; 209 char *nbrk = SCARG(uap, nsize); 210 struct sys_obreak_args oba; 211 struct vmspace *vm = p->p_vmspace; 212 caddr_t oldbrk; 213 214 oldbrk = vm->vm_daddr + ctob(vm->vm_dsize); 215 /* 216 * XXX inconsistent.. Linux always returns at least the old 217 * brk value, but it will be page-aligned if this fails, 218 * and possibly not page aligned if it succeeds (the user 219 * supplied pointer is returned). 220 */ 221 SCARG(&oba, nsize) = nbrk; 222 223 if ((caddr_t) nbrk > vm->vm_daddr && sys_obreak(p, &oba, retval) == 0) 224 retval[0] = (register_t)nbrk; 225 else 226 retval[0] = (register_t)oldbrk; 227 228 return 0; 229 } 230 231 /* 232 * Convert BSD statfs structure to Linux statfs structure. 233 * The Linux structure has less fields, and it also wants 234 * the length of a name in a dir entry in a field, which 235 * we fake (probably the wrong way). 236 */ 237 static void 238 bsd_to_linux_statfs(bsp, lsp) 239 struct statfs *bsp; 240 struct linux_statfs *lsp; 241 { 242 243 lsp->l_ftype = bsp->f_type; 244 lsp->l_fbsize = bsp->f_bsize; 245 lsp->l_fblocks = bsp->f_blocks; 246 lsp->l_fbfree = bsp->f_bfree; 247 lsp->l_fbavail = bsp->f_bavail; 248 lsp->l_ffiles = bsp->f_files; 249 lsp->l_fffree = bsp->f_ffree; 250 lsp->l_ffsid.val[0] = bsp->f_fsid.val[0]; 251 lsp->l_ffsid.val[1] = bsp->f_fsid.val[1]; 252 lsp->l_fnamelen = MAXNAMLEN; /* XXX */ 253 } 254 255 /* 256 * Implement the fs stat functions. Straightforward. 257 */ 258 int 259 linux_sys_statfs(p, v, retval) 260 struct proc *p; 261 void *v; 262 register_t *retval; 263 { 264 struct linux_sys_statfs_args /* { 265 syscallarg(const char *) path; 266 syscallarg(struct linux_statfs *) sp; 267 } */ *uap = v; 268 struct statfs btmp, *bsp; 269 struct linux_statfs ltmp; 270 struct sys_statfs_args bsa; 271 caddr_t sg; 272 int error; 273 274 sg = stackgap_init(p->p_emul); 275 bsp = (struct statfs *) stackgap_alloc(&sg, sizeof (struct statfs)); 276 277 LINUX_CHECK_ALT_EXIST(p, &sg, SCARG(uap, path)); 278 279 SCARG(&bsa, path) = SCARG(uap, path); 280 SCARG(&bsa, buf) = bsp; 281 282 if ((error = sys_statfs(p, &bsa, retval))) 283 return error; 284 285 if ((error = copyin((caddr_t) bsp, (caddr_t) &btmp, sizeof btmp))) 286 return error; 287 288 bsd_to_linux_statfs(&btmp, <mp); 289 290 return copyout((caddr_t) <mp, (caddr_t) SCARG(uap, sp), sizeof ltmp); 291 } 292 293 int 294 linux_sys_fstatfs(p, v, retval) 295 struct proc *p; 296 void *v; 297 register_t *retval; 298 { 299 struct linux_sys_fstatfs_args /* { 300 syscallarg(int) fd; 301 syscallarg(struct linux_statfs *) sp; 302 } */ *uap = v; 303 struct statfs btmp, *bsp; 304 struct linux_statfs ltmp; 305 struct sys_fstatfs_args bsa; 306 caddr_t sg; 307 int error; 308 309 sg = stackgap_init(p->p_emul); 310 bsp = (struct statfs *) stackgap_alloc(&sg, sizeof (struct statfs)); 311 312 SCARG(&bsa, fd) = SCARG(uap, fd); 313 SCARG(&bsa, buf) = bsp; 314 315 if ((error = sys_fstatfs(p, &bsa, retval))) 316 return error; 317 318 if ((error = copyin((caddr_t) bsp, (caddr_t) &btmp, sizeof btmp))) 319 return error; 320 321 bsd_to_linux_statfs(&btmp, <mp); 322 323 return copyout((caddr_t) <mp, (caddr_t) SCARG(uap, sp), sizeof ltmp); 324 } 325 326 /* 327 * uname(). Just copy the info from the various strings stored in the 328 * kernel, and put it in the Linux utsname structure. That structure 329 * is almost the same as the NetBSD one, only it has fields 65 characters 330 * long, and an extra domainname field. 331 */ 332 int 333 linux_sys_uname(p, v, retval) 334 struct proc *p; 335 void *v; 336 register_t *retval; 337 { 338 struct linux_sys_uname_args /* { 339 syscallarg(struct linux_utsname *) up; 340 } */ *uap = v; 341 extern char ostype[], hostname[], osrelease[], version[], machine[], 342 domainname[]; 343 struct linux_utsname luts; 344 int len; 345 char *cp; 346 347 strncpy(luts.l_sysname, ostype, sizeof(luts.l_sysname)); 348 strncpy(luts.l_nodename, hostname, sizeof(luts.l_nodename)); 349 strncpy(luts.l_release, osrelease, sizeof(luts.l_release)); 350 strncpy(luts.l_version, version, sizeof(luts.l_version)); 351 strncpy(luts.l_machine, machine, sizeof(luts.l_machine)); 352 strncpy(luts.l_domainname, domainname, sizeof(luts.l_domainname)); 353 354 /* This part taken from the the uname() in libc */ 355 len = sizeof(luts.l_version); 356 for (cp = luts.l_version; len--; ++cp) { 357 if (*cp == '\n' || *cp == '\t') { 358 if (len > 1) 359 *cp = ' '; 360 else 361 *cp = '\0'; 362 } 363 } 364 365 return copyout(&luts, SCARG(uap, up), sizeof(luts)); 366 } 367 368 /* Used directly on: alpha, mips, ppc, sparc, sparc64 */ 369 /* Used indirectly on: arm, i386, m68k */ 370 371 /* 372 * New type Linux mmap call. 373 * Only called directly on machines with >= 6 free regs. 374 */ 375 int 376 linux_sys_mmap(p, v, retval) 377 struct proc *p; 378 void *v; 379 register_t *retval; 380 { 381 struct linux_sys_mmap_args /* { 382 syscallarg(unsigned long) addr; 383 syscallarg(size_t) len; 384 syscallarg(int) prot; 385 syscallarg(int) flags; 386 syscallarg(int) fd; 387 syscallarg(off_t) offset; 388 } */ *uap = v; 389 struct sys_mmap_args cma; 390 int flags; 391 392 flags = 0; 393 flags |= cvtto_bsd_mask(SCARG(uap,flags), LINUX_MAP_SHARED, MAP_SHARED); 394 flags |= cvtto_bsd_mask(SCARG(uap,flags), LINUX_MAP_PRIVATE, MAP_PRIVATE); 395 flags |= cvtto_bsd_mask(SCARG(uap,flags), LINUX_MAP_FIXED, MAP_FIXED); 396 flags |= cvtto_bsd_mask(SCARG(uap,flags), LINUX_MAP_ANON, MAP_ANON); 397 /* XXX XAX ERH: Any other flags here? There are more defined... */ 398 399 SCARG(&cma,addr) = (void *)SCARG(uap, addr); 400 SCARG(&cma,len) = SCARG(uap, len); 401 SCARG(&cma,prot) = SCARG(uap, prot); 402 if (SCARG(&cma,prot) & VM_PROT_WRITE) /* XXX */ 403 SCARG(&cma,prot) |= VM_PROT_READ; 404 SCARG(&cma,flags) = flags; 405 SCARG(&cma,fd) = SCARG(uap, fd); 406 SCARG(&cma,pad) = 0; 407 SCARG(&cma,pos) = SCARG(uap, offset); 408 409 return sys_mmap(p, &cma, retval); 410 } 411 412 int 413 linux_sys_mremap(p, v, retval) 414 struct proc *p; 415 void *v; 416 register_t *retval; 417 { 418 struct linux_sys_mremap_args /* { 419 syscallarg(void *) old_address; 420 syscallarg(size_t) old_size; 421 syscallarg(size_t) new_size; 422 syscallarg(u_long) flags; 423 } */ *uap = v; 424 struct sys_munmap_args mua; 425 size_t old_size, new_size; 426 int error; 427 428 old_size = round_page(SCARG(uap, old_size)); 429 new_size = round_page(SCARG(uap, new_size)); 430 431 /* 432 * Growing mapped region. 433 */ 434 if (new_size > old_size) { 435 /* 436 * XXX Implement me. What we probably want to do is 437 * XXX dig out the guts of the old mapping, mmap that 438 * XXX object again with the new size, then munmap 439 * XXX the old mapping. 440 */ 441 *retval = 0; 442 return (ENOMEM); 443 } 444 445 /* 446 * Shrinking mapped region. 447 */ 448 if (new_size < old_size) { 449 SCARG(&mua, addr) = (caddr_t)SCARG(uap, old_address) + 450 new_size; 451 SCARG(&mua, len) = old_size - new_size; 452 error = sys_munmap(p, &mua, retval); 453 *retval = error ? 0 : (register_t)SCARG(uap, old_address); 454 return (error); 455 } 456 457 /* 458 * No change. 459 */ 460 *retval = (register_t)SCARG(uap, old_address); 461 return (0); 462 } 463 464 int 465 linux_sys_msync(p, v, retval) 466 struct proc *p; 467 void *v; 468 register_t *retval; 469 { 470 struct linux_sys_msync_args /* { 471 syscallarg(caddr_t) addr; 472 syscallarg(int) len; 473 syscallarg(int) fl; 474 } */ *uap = v; 475 476 struct sys___msync13_args bma; 477 478 /* flags are ignored */ 479 SCARG(&bma, addr) = SCARG(uap, addr); 480 SCARG(&bma, len) = SCARG(uap, len); 481 SCARG(&bma, flags) = SCARG(uap, fl); 482 483 return sys___msync13(p, &bma, retval); 484 } 485 486 /* 487 * This code is partly stolen from src/lib/libc/compat-43/times.c 488 * XXX - CLK_TCK isn't declared in /sys, just in <time.h>, done here 489 */ 490 491 #define CLK_TCK 100 492 #define CONVTCK(r) (r.tv_sec * CLK_TCK + r.tv_usec / (1000000 / CLK_TCK)) 493 494 int 495 linux_sys_times(p, v, retval) 496 struct proc *p; 497 void *v; 498 register_t *retval; 499 { 500 struct linux_sys_times_args /* { 501 syscallarg(struct times *) tms; 502 } */ *uap = v; 503 struct timeval t; 504 struct linux_tms ltms; 505 struct rusage ru; 506 int error, s; 507 508 calcru(p, &ru.ru_utime, &ru.ru_stime, NULL); 509 ltms.ltms_utime = CONVTCK(ru.ru_utime); 510 ltms.ltms_stime = CONVTCK(ru.ru_stime); 511 512 ltms.ltms_cutime = CONVTCK(p->p_stats->p_cru.ru_utime); 513 ltms.ltms_cstime = CONVTCK(p->p_stats->p_cru.ru_stime); 514 515 if ((error = copyout(<ms, SCARG(uap, tms), sizeof ltms))) 516 return error; 517 518 s = splclock(); 519 timersub(&time, &boottime, &t); 520 splx(s); 521 522 retval[0] = ((linux_clock_t)(CONVTCK(t))); 523 return 0; 524 } 525 526 /* 527 * Linux 'readdir' call. This code is mostly taken from the 528 * SunOS getdents call (see compat/sunos/sunos_misc.c), though 529 * an attempt has been made to keep it a little cleaner (failing 530 * miserably, because of the cruft needed if count 1 is passed). 531 * 532 * The d_off field should contain the offset of the next valid entry, 533 * but in Linux it has the offset of the entry itself. We emulate 534 * that bug here. 535 * 536 * Read in BSD-style entries, convert them, and copy them out. 537 * 538 * Note that this doesn't handle union-mounted filesystems. 539 */ 540 int 541 linux_sys_getdents(p, v, retval) 542 struct proc *p; 543 void *v; 544 register_t *retval; 545 { 546 struct linux_sys_getdents_args /* { 547 syscallarg(int) fd; 548 syscallarg(struct linux_dirent *) dent; 549 syscallarg(unsigned int) count; 550 } */ *uap = v; 551 register struct dirent *bdp; 552 struct vnode *vp; 553 caddr_t inp, buf; /* BSD-format */ 554 int len, reclen; /* BSD-format */ 555 caddr_t outp; /* Linux-format */ 556 int resid, linux_reclen = 0; /* Linux-format */ 557 struct file *fp; 558 struct uio auio; 559 struct iovec aiov; 560 struct linux_dirent idb; 561 off_t off; /* true file offset */ 562 int buflen, error, eofflag, nbytes, oldcall; 563 struct vattr va; 564 off_t *cookiebuf = NULL, *cookie; 565 int ncookies; 566 567 /* getvnode() will use the descriptor for us */ 568 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 569 return (error); 570 571 if ((fp->f_flag & FREAD) == 0) { 572 error = EBADF; 573 goto out1; 574 } 575 576 vp = (struct vnode *)fp->f_data; 577 if (vp->v_type != VDIR) { 578 error = EINVAL; 579 goto out1; 580 } 581 582 if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p))) 583 goto out1; 584 585 nbytes = SCARG(uap, count); 586 if (nbytes == 1) { /* emulating old, broken behaviour */ 587 nbytes = sizeof (struct linux_dirent); 588 buflen = max(va.va_blocksize, nbytes); 589 oldcall = 1; 590 } else { 591 buflen = min(MAXBSIZE, nbytes); 592 if (buflen < va.va_blocksize) 593 buflen = va.va_blocksize; 594 oldcall = 0; 595 } 596 buf = malloc(buflen, M_TEMP, M_WAITOK); 597 598 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 599 off = fp->f_offset; 600 again: 601 aiov.iov_base = buf; 602 aiov.iov_len = buflen; 603 auio.uio_iov = &aiov; 604 auio.uio_iovcnt = 1; 605 auio.uio_rw = UIO_READ; 606 auio.uio_segflg = UIO_SYSSPACE; 607 auio.uio_procp = p; 608 auio.uio_resid = buflen; 609 auio.uio_offset = off; 610 /* 611 * First we read into the malloc'ed buffer, then 612 * we massage it into user space, one record at a time. 613 */ 614 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, &cookiebuf, 615 &ncookies); 616 if (error) 617 goto out; 618 619 inp = buf; 620 outp = (caddr_t)SCARG(uap, dent); 621 resid = nbytes; 622 if ((len = buflen - auio.uio_resid) == 0) 623 goto eof; 624 625 for (cookie = cookiebuf; len > 0; len -= reclen) { 626 bdp = (struct dirent *)inp; 627 reclen = bdp->d_reclen; 628 if (reclen & 3) 629 panic("linux_readdir"); 630 if (bdp->d_fileno == 0) { 631 inp += reclen; /* it is a hole; squish it out */ 632 off = *cookie++; 633 continue; 634 } 635 linux_reclen = LINUX_RECLEN(&idb, bdp->d_namlen); 636 if (reclen > len || resid < linux_reclen) { 637 /* entry too big for buffer, so just stop */ 638 outp++; 639 break; 640 } 641 /* 642 * Massage in place to make a Linux-shaped dirent (otherwise 643 * we have to worry about touching user memory outside of 644 * the copyout() call). 645 */ 646 idb.d_ino = (linux_ino_t)bdp->d_fileno; 647 /* 648 * The old readdir() call misuses the offset and reclen fields. 649 */ 650 if (oldcall) { 651 idb.d_off = (linux_off_t)linux_reclen; 652 idb.d_reclen = (u_short)bdp->d_namlen; 653 } else { 654 if (sizeof (linux_off_t) < 4 && (off >> 32) != 0) { 655 compat_offseterr(vp, "linux_getdents"); 656 error = EINVAL; 657 goto out; 658 } 659 idb.d_off = (linux_off_t)off; 660 idb.d_reclen = (u_short)linux_reclen; 661 } 662 strcpy(idb.d_name, bdp->d_name); 663 if ((error = copyout((caddr_t)&idb, outp, linux_reclen))) 664 goto out; 665 /* advance past this real entry */ 666 inp += reclen; 667 off = *cookie++; /* each entry points to itself */ 668 /* advance output past Linux-shaped entry */ 669 outp += linux_reclen; 670 resid -= linux_reclen; 671 if (oldcall) 672 break; 673 } 674 675 /* if we squished out the whole block, try again */ 676 if (outp == (caddr_t)SCARG(uap, dent)) 677 goto again; 678 fp->f_offset = off; /* update the vnode offset */ 679 680 if (oldcall) 681 nbytes = resid + linux_reclen; 682 683 eof: 684 *retval = nbytes - resid; 685 out: 686 VOP_UNLOCK(vp, 0); 687 if (cookiebuf) 688 free(cookiebuf, M_TEMP); 689 free(buf, M_TEMP); 690 out1: 691 FILE_UNUSE(fp, p); 692 return error; 693 } 694 695 /* 696 * Even when just using registers to pass arguments to syscalls you can 697 * have 5 of them on the i386. So this newer version of select() does 698 * this. 699 */ 700 int 701 linux_sys_select(p, v, retval) 702 struct proc *p; 703 void *v; 704 register_t *retval; 705 { 706 struct linux_sys_select_args /* { 707 syscallarg(int) nfds; 708 syscallarg(fd_set *) readfds; 709 syscallarg(fd_set *) writefds; 710 syscallarg(fd_set *) exceptfds; 711 syscallarg(struct timeval *) timeout; 712 } */ *uap = v; 713 714 return linux_select1(p, retval, SCARG(uap, nfds), SCARG(uap, readfds), 715 SCARG(uap, writefds), SCARG(uap, exceptfds), SCARG(uap, timeout)); 716 } 717 718 /* 719 * Common code for the old and new versions of select(). A couple of 720 * things are important: 721 * 1) return the amount of time left in the 'timeout' parameter 722 * 2) select never returns ERESTART on Linux, always return EINTR 723 */ 724 int 725 linux_select1(p, retval, nfds, readfds, writefds, exceptfds, timeout) 726 struct proc *p; 727 register_t *retval; 728 int nfds; 729 fd_set *readfds, *writefds, *exceptfds; 730 struct timeval *timeout; 731 { 732 struct sys_select_args bsa; 733 struct timeval tv0, tv1, utv, *tvp; 734 caddr_t sg; 735 int error; 736 737 SCARG(&bsa, nd) = nfds; 738 SCARG(&bsa, in) = readfds; 739 SCARG(&bsa, ou) = writefds; 740 SCARG(&bsa, ex) = exceptfds; 741 SCARG(&bsa, tv) = timeout; 742 743 /* 744 * Store current time for computation of the amount of 745 * time left. 746 */ 747 if (timeout) { 748 if ((error = copyin(timeout, &utv, sizeof(utv)))) 749 return error; 750 if (itimerfix(&utv)) { 751 /* 752 * The timeval was invalid. Convert it to something 753 * valid that will act as it does under Linux. 754 */ 755 sg = stackgap_init(p->p_emul); 756 tvp = stackgap_alloc(&sg, sizeof(utv)); 757 utv.tv_sec += utv.tv_usec / 1000000; 758 utv.tv_usec %= 1000000; 759 if (utv.tv_usec < 0) { 760 utv.tv_sec -= 1; 761 utv.tv_usec += 1000000; 762 } 763 if (utv.tv_sec < 0) 764 timerclear(&utv); 765 if ((error = copyout(&utv, tvp, sizeof(utv)))) 766 return error; 767 SCARG(&bsa, tv) = tvp; 768 } 769 microtime(&tv0); 770 } 771 772 error = sys_select(p, &bsa, retval); 773 if (error) { 774 /* 775 * See fs/select.c in the Linux kernel. Without this, 776 * Maelstrom doesn't work. 777 */ 778 if (error == ERESTART) 779 error = EINTR; 780 return error; 781 } 782 783 if (timeout) { 784 if (*retval) { 785 /* 786 * Compute how much time was left of the timeout, 787 * by subtracting the current time and the time 788 * before we started the call, and subtracting 789 * that result from the user-supplied value. 790 */ 791 microtime(&tv1); 792 timersub(&tv1, &tv0, &tv1); 793 timersub(&utv, &tv1, &utv); 794 if (utv.tv_sec < 0) 795 timerclear(&utv); 796 } else 797 timerclear(&utv); 798 if ((error = copyout(&utv, timeout, sizeof(utv)))) 799 return error; 800 } 801 802 return 0; 803 } 804 805 /* 806 * Get the process group of a certain process. Look it up 807 * and return the value. 808 */ 809 int 810 linux_sys_getpgid(p, v, retval) 811 struct proc *p; 812 void *v; 813 register_t *retval; 814 { 815 struct linux_sys_getpgid_args /* { 816 syscallarg(int) pid; 817 } */ *uap = v; 818 struct proc *targp; 819 820 if (SCARG(uap, pid) != 0 && SCARG(uap, pid) != p->p_pid) { 821 if ((targp = pfind(SCARG(uap, pid))) == 0) 822 return ESRCH; 823 } 824 else 825 targp = p; 826 827 retval[0] = targp->p_pgid; 828 return 0; 829 } 830 831 /* 832 * Set the 'personality' (emulation mode) for the current process. Only 833 * accept the Linux personality here (0). This call is needed because 834 * the Linux ELF crt0 issues it in an ugly kludge to make sure that 835 * ELF binaries run in Linux mode, not SVR4 mode. 836 */ 837 int 838 linux_sys_personality(p, v, retval) 839 struct proc *p; 840 void *v; 841 register_t *retval; 842 { 843 struct linux_sys_personality_args /* { 844 syscallarg(int) per; 845 } */ *uap = v; 846 847 if (SCARG(uap, per) != 0) 848 return EINVAL; 849 retval[0] = 0; 850 return 0; 851 } 852 853 /* 854 * The calls are here because of type conversions. 855 */ 856 int 857 linux_sys_setreuid(p, v, retval) 858 struct proc *p; 859 void *v; 860 register_t *retval; 861 { 862 struct linux_sys_setreuid_args /* { 863 syscallarg(int) ruid; 864 syscallarg(int) euid; 865 } */ *uap = v; 866 struct sys_setreuid_args bsa; 867 868 SCARG(&bsa, ruid) = ((linux_uid_t)SCARG(uap, ruid) == (linux_uid_t)-1) ? 869 (uid_t)-1 : SCARG(uap, ruid); 870 SCARG(&bsa, euid) = ((linux_uid_t)SCARG(uap, euid) == (linux_uid_t)-1) ? 871 (uid_t)-1 : SCARG(uap, euid); 872 873 return sys_setreuid(p, &bsa, retval); 874 } 875 876 int 877 linux_sys_setregid(p, v, retval) 878 struct proc *p; 879 void *v; 880 register_t *retval; 881 { 882 struct linux_sys_setregid_args /* { 883 syscallarg(int) rgid; 884 syscallarg(int) egid; 885 } */ *uap = v; 886 struct sys_setregid_args bsa; 887 888 SCARG(&bsa, rgid) = ((linux_gid_t)SCARG(uap, rgid) == (linux_gid_t)-1) ? 889 (uid_t)-1 : SCARG(uap, rgid); 890 SCARG(&bsa, egid) = ((linux_gid_t)SCARG(uap, egid) == (linux_gid_t)-1) ? 891 (uid_t)-1 : SCARG(uap, egid); 892 893 return sys_setregid(p, &bsa, retval); 894 } 895 896 int 897 linux_sys___sysctl(p, v, retval) 898 struct proc *p; 899 void *v; 900 register_t *retval; 901 { 902 struct linux_sys___sysctl_args /* { 903 syscallarg(struct linux___sysctl *) lsp; 904 } */ *uap = v; 905 struct linux___sysctl ls; 906 struct sys___sysctl_args bsa; 907 int error; 908 909 if ((error = copyin(SCARG(uap, lsp), &ls, sizeof ls))) 910 return error; 911 SCARG(&bsa, name) = ls.name; 912 SCARG(&bsa, namelen) = ls.namelen; 913 SCARG(&bsa, old) = ls.old; 914 SCARG(&bsa, oldlenp) = ls.oldlenp; 915 SCARG(&bsa, new) = ls.new; 916 SCARG(&bsa, newlen) = ls.newlen; 917 918 return sys___sysctl(p, &bsa, retval); 919 } 920 921 int 922 linux_sys_setresuid(p, v, retval) 923 struct proc *p; 924 void *v; 925 register_t *retval; 926 { 927 struct linux_sys_setresuid_args /* { 928 syscallarg(uid_t) ruid; 929 syscallarg(uid_t) euid; 930 syscallarg(uid_t) suid; 931 } */ *uap = v; 932 struct pcred *pc = p->p_cred; 933 uid_t ruid, euid, suid; 934 int error; 935 936 ruid = SCARG(uap, ruid); 937 euid = SCARG(uap, euid); 938 suid = SCARG(uap, suid); 939 940 /* 941 * Note: These checks are a little different than the NetBSD 942 * setreuid(2) call performs. This precisely follows the 943 * behavior of the Linux kernel. 944 */ 945 if (ruid != (uid_t)-1 && 946 ruid != pc->p_ruid && 947 ruid != pc->pc_ucred->cr_uid && 948 ruid != pc->p_svuid && 949 (error = suser(pc->pc_ucred, &p->p_acflag))) 950 return (error); 951 952 if (euid != (uid_t)-1 && 953 euid != pc->p_ruid && 954 euid != pc->pc_ucred->cr_uid && 955 euid != pc->p_svuid && 956 (error = suser(pc->pc_ucred, &p->p_acflag))) 957 return (error); 958 959 if (suid != (uid_t)-1 && 960 suid != pc->p_ruid && 961 suid != pc->pc_ucred->cr_uid && 962 suid != pc->p_svuid && 963 (error = suser(pc->pc_ucred, &p->p_acflag))) 964 return (error); 965 966 /* 967 * Now assign the new real, effective, and saved UIDs. 968 * Note that Linux, unlike NetBSD in setreuid(2), does not 969 * set the saved UID in this call unless the user specifies 970 * it. 971 */ 972 if (ruid != (uid_t)-1) { 973 (void)chgproccnt(pc->p_ruid, -1); 974 (void)chgproccnt(ruid, 1); 975 pc->p_ruid = ruid; 976 } 977 978 if (euid != (uid_t)-1) { 979 pc->pc_ucred = crcopy(pc->pc_ucred); 980 pc->pc_ucred->cr_uid = euid; 981 } 982 983 if (suid != (uid_t)-1) 984 pc->p_svuid = suid; 985 986 if (ruid != (uid_t)-1 && euid != (uid_t)-1 && suid != (uid_t)-1) 987 p->p_flag |= P_SUGID; 988 return (0); 989 } 990 991 int 992 linux_sys_getresuid(p, v, retval) 993 struct proc *p; 994 void *v; 995 register_t *retval; 996 { 997 struct linux_sys_getresuid_args /* { 998 syscallarg(uid_t *) ruid; 999 syscallarg(uid_t *) euid; 1000 syscallarg(uid_t *) suid; 1001 } */ *uap = v; 1002 struct pcred *pc = p->p_cred; 1003 int error; 1004 1005 /* 1006 * Linux copies these values out to userspace like so: 1007 * 1008 * 1. Copy out ruid. 1009 * 2. If that succeeds, copy out euid. 1010 * 3. If both of those succeed, copy out suid. 1011 */ 1012 if ((error = copyout(&pc->p_ruid, SCARG(uap, ruid), 1013 sizeof(uid_t))) != 0) 1014 return (error); 1015 1016 if ((error = copyout(&pc->pc_ucred->cr_uid, SCARG(uap, euid), 1017 sizeof(uid_t))) != 0) 1018 return (error); 1019 1020 return (copyout(&pc->p_svuid, SCARG(uap, suid), sizeof(uid_t))); 1021 } 1022