1 /* $NetBSD: linux_misc.c,v 1.129 2004/09/13 20:09:44 jdolecek 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/cdefs.h> 67 __KERNEL_RCSID(0, "$NetBSD: linux_misc.c,v 1.129 2004/09/13 20:09:44 jdolecek Exp $"); 68 69 #include <sys/param.h> 70 #include <sys/systm.h> 71 #include <sys/namei.h> 72 #include <sys/proc.h> 73 #include <sys/dirent.h> 74 #include <sys/file.h> 75 #include <sys/stat.h> 76 #include <sys/filedesc.h> 77 #include <sys/ioctl.h> 78 #include <sys/kernel.h> 79 #include <sys/malloc.h> 80 #include <sys/mbuf.h> 81 #include <sys/mman.h> 82 #include <sys/mount.h> 83 #include <sys/reboot.h> 84 #include <sys/resource.h> 85 #include <sys/resourcevar.h> 86 #include <sys/signal.h> 87 #include <sys/signalvar.h> 88 #include <sys/socket.h> 89 #include <sys/time.h> 90 #include <sys/times.h> 91 #include <sys/vnode.h> 92 #include <sys/uio.h> 93 #include <sys/wait.h> 94 #include <sys/utsname.h> 95 #include <sys/unistd.h> 96 #include <sys/swap.h> /* for SWAP_ON */ 97 #include <sys/sysctl.h> /* for KERN_DOMAINNAME */ 98 99 #include <sys/ptrace.h> 100 #include <machine/ptrace.h> 101 102 #include <sys/sa.h> 103 #include <sys/syscallargs.h> 104 105 #include <compat/linux/common/linux_types.h> 106 #include <compat/linux/common/linux_signal.h> 107 108 #include <compat/linux/linux_syscallargs.h> 109 110 #include <compat/linux/common/linux_fcntl.h> 111 #include <compat/linux/common/linux_mmap.h> 112 #include <compat/linux/common/linux_dirent.h> 113 #include <compat/linux/common/linux_util.h> 114 #include <compat/linux/common/linux_misc.h> 115 #include <compat/linux/common/linux_ptrace.h> 116 #include <compat/linux/common/linux_reboot.h> 117 #include <compat/linux/common/linux_emuldata.h> 118 119 const int linux_ptrace_request_map[] = { 120 LINUX_PTRACE_TRACEME, PT_TRACE_ME, 121 LINUX_PTRACE_PEEKTEXT, PT_READ_I, 122 LINUX_PTRACE_PEEKDATA, PT_READ_D, 123 LINUX_PTRACE_POKETEXT, PT_WRITE_I, 124 LINUX_PTRACE_POKEDATA, PT_WRITE_D, 125 LINUX_PTRACE_CONT, PT_CONTINUE, 126 LINUX_PTRACE_KILL, PT_KILL, 127 LINUX_PTRACE_ATTACH, PT_ATTACH, 128 LINUX_PTRACE_DETACH, PT_DETACH, 129 #ifdef PT_STEP 130 LINUX_PTRACE_SINGLESTEP, PT_STEP, 131 #endif 132 -1 133 }; 134 135 static const struct mnttypes { 136 char *bsd; 137 int linux; 138 } fstypes[] = { 139 { MOUNT_FFS, LINUX_DEFAULT_SUPER_MAGIC }, 140 { MOUNT_NFS, LINUX_NFS_SUPER_MAGIC }, 141 { MOUNT_MFS, LINUX_DEFAULT_SUPER_MAGIC }, 142 { MOUNT_MSDOS, LINUX_MSDOS_SUPER_MAGIC }, 143 { MOUNT_LFS, LINUX_DEFAULT_SUPER_MAGIC }, 144 { MOUNT_FDESC, LINUX_DEFAULT_SUPER_MAGIC }, 145 { MOUNT_PORTAL, LINUX_DEFAULT_SUPER_MAGIC }, 146 { MOUNT_NULL, LINUX_DEFAULT_SUPER_MAGIC }, 147 { MOUNT_OVERLAY, LINUX_DEFAULT_SUPER_MAGIC }, 148 { MOUNT_UMAP, LINUX_DEFAULT_SUPER_MAGIC }, 149 { MOUNT_KERNFS, LINUX_DEFAULT_SUPER_MAGIC }, 150 { MOUNT_PROCFS, LINUX_PROC_SUPER_MAGIC }, 151 { MOUNT_AFS, LINUX_DEFAULT_SUPER_MAGIC }, 152 { MOUNT_CD9660, LINUX_ISOFS_SUPER_MAGIC }, 153 { MOUNT_UNION, LINUX_DEFAULT_SUPER_MAGIC }, 154 { MOUNT_ADOSFS, LINUX_ADFS_SUPER_MAGIC }, 155 { MOUNT_EXT2FS, LINUX_EXT2_SUPER_MAGIC }, 156 { MOUNT_CFS, LINUX_DEFAULT_SUPER_MAGIC }, 157 { MOUNT_CODA, LINUX_CODA_SUPER_MAGIC }, 158 { MOUNT_FILECORE, LINUX_DEFAULT_SUPER_MAGIC }, 159 { MOUNT_NTFS, LINUX_DEFAULT_SUPER_MAGIC }, 160 { MOUNT_SMBFS, LINUX_SMB_SUPER_MAGIC } 161 }; 162 #define FSTYPESSIZE (sizeof(fstypes) / sizeof(fstypes[0])) 163 164 #ifdef DEBUG_LINUX 165 #define DPRINTF(a) uprintf a 166 #else 167 #define DPRINTF(a) 168 #endif 169 170 /* Local linux_misc.c functions: */ 171 static void bsd_to_linux_statfs __P((const struct statvfs *, 172 struct linux_statfs *)); 173 static int linux_to_bsd_limit __P((int)); 174 static void linux_to_bsd_mmap_args __P((struct sys_mmap_args *, 175 const struct linux_sys_mmap_args *)); 176 static int linux_mmap __P((struct lwp *, struct linux_sys_mmap_args *, 177 register_t *, off_t)); 178 179 180 /* 181 * The information on a terminated (or stopped) process needs 182 * to be converted in order for Linux binaries to get a valid signal 183 * number out of it. 184 */ 185 void 186 bsd_to_linux_wstat(st) 187 int *st; 188 { 189 190 int sig; 191 192 if (WIFSIGNALED(*st)) { 193 sig = WTERMSIG(*st); 194 if (sig >= 0 && sig < NSIG) 195 *st= (*st& ~0177) | native_to_linux_signo[sig]; 196 } else if (WIFSTOPPED(*st)) { 197 sig = WSTOPSIG(*st); 198 if (sig >= 0 && sig < NSIG) 199 *st = (*st & ~0xff00) | 200 (native_to_linux_signo[sig] << 8); 201 } 202 } 203 204 /* 205 * This is very much the same as waitpid() 206 */ 207 int 208 linux_sys_wait4(l, v, retval) 209 struct lwp *l; 210 void *v; 211 register_t *retval; 212 { 213 struct linux_sys_wait4_args /* { 214 syscallarg(int) pid; 215 syscallarg(int *) status; 216 syscallarg(int) options; 217 syscallarg(struct rusage *) rusage; 218 } */ *uap = v; 219 struct proc *p = l->l_proc; 220 struct sys_wait4_args w4a; 221 int error, *status, tstat, options, linux_options; 222 caddr_t sg; 223 224 if (SCARG(uap, status) != NULL) { 225 sg = stackgap_init(p, 0); 226 status = (int *) stackgap_alloc(p, &sg, sizeof *status); 227 } else 228 status = NULL; 229 230 linux_options = SCARG(uap, options); 231 options = 0; 232 if (linux_options & 233 ~(LINUX_WAIT4_WNOHANG|LINUX_WAIT4_WUNTRACED|LINUX_WAIT4_WALL| 234 LINUX_WAIT4_WCLONE)) 235 return (EINVAL); 236 237 if (linux_options & LINUX_WAIT4_WNOHANG) 238 options |= WNOHANG; 239 if (linux_options & LINUX_WAIT4_WUNTRACED) 240 options |= WUNTRACED; 241 if (linux_options & LINUX_WAIT4_WALL) 242 options |= WALLSIG; 243 if (linux_options & LINUX_WAIT4_WCLONE) 244 options |= WALTSIG; 245 246 SCARG(&w4a, pid) = SCARG(uap, pid); 247 SCARG(&w4a, status) = status; 248 SCARG(&w4a, options) = options; 249 SCARG(&w4a, rusage) = SCARG(uap, rusage); 250 251 if ((error = sys_wait4(l, &w4a, retval))) 252 return error; 253 254 sigdelset(&p->p_sigctx.ps_siglist, SIGCHLD); 255 256 if (status != NULL) { 257 if ((error = copyin(status, &tstat, sizeof tstat))) 258 return error; 259 260 bsd_to_linux_wstat(&tstat); 261 return copyout(&tstat, SCARG(uap, status), sizeof tstat); 262 } 263 264 return 0; 265 } 266 267 /* 268 * Linux brk(2). The check if the new address is >= the old one is 269 * done in the kernel in Linux. NetBSD does it in the library. 270 */ 271 int 272 linux_sys_brk(l, v, retval) 273 struct lwp *l; 274 void *v; 275 register_t *retval; 276 { 277 struct linux_sys_brk_args /* { 278 syscallarg(char *) nsize; 279 } */ *uap = v; 280 struct proc *p = l->l_proc; 281 char *nbrk = SCARG(uap, nsize); 282 struct sys_obreak_args oba; 283 struct vmspace *vm = p->p_vmspace; 284 struct linux_emuldata *ed = (struct linux_emuldata*)p->p_emuldata; 285 286 SCARG(&oba, nsize) = nbrk; 287 288 if ((caddr_t) nbrk > vm->vm_daddr && sys_obreak(l, &oba, retval) == 0) 289 ed->s->p_break = (char*)nbrk; 290 else 291 nbrk = ed->s->p_break; 292 293 retval[0] = (register_t)nbrk; 294 295 return 0; 296 } 297 298 /* 299 * Convert BSD statfs structure to Linux statfs structure. 300 * The Linux structure has less fields, and it also wants 301 * the length of a name in a dir entry in a field, which 302 * we fake (probably the wrong way). 303 */ 304 static void 305 bsd_to_linux_statfs(bsp, lsp) 306 const struct statvfs *bsp; 307 struct linux_statfs *lsp; 308 { 309 int i; 310 311 for (i = 0; i < FSTYPESSIZE; i++) 312 if (strcmp(bsp->f_fstypename, fstypes[i].bsd) == 0) 313 break; 314 315 if (i == FSTYPESSIZE) { 316 DPRINTF(("unhandled fstype in linux emulation: %s\n", 317 bsp->f_fstypename)); 318 lsp->l_ftype = LINUX_DEFAULT_SUPER_MAGIC; 319 } else { 320 lsp->l_ftype = fstypes[i].linux; 321 } 322 323 lsp->l_fbsize = bsp->f_frsize; 324 lsp->l_fblocks = bsp->f_blocks; 325 lsp->l_fbfree = bsp->f_bfree; 326 lsp->l_fbavail = bsp->f_bavail; 327 lsp->l_ffiles = bsp->f_files; 328 lsp->l_fffree = bsp->f_ffree; 329 /* Linux sets the fsid to 0..., we don't */ 330 lsp->l_ffsid.val[0] = bsp->f_fsidx.__fsid_val[0]; 331 lsp->l_ffsid.val[1] = bsp->f_fsidx.__fsid_val[1]; 332 lsp->l_fnamelen = bsp->f_namemax; 333 (void)memset(lsp->l_fspare, 0, sizeof(lsp->l_fspare)); 334 } 335 336 /* 337 * Implement the fs stat functions. Straightforward. 338 */ 339 int 340 linux_sys_statfs(l, v, retval) 341 struct lwp *l; 342 void *v; 343 register_t *retval; 344 { 345 struct linux_sys_statfs_args /* { 346 syscallarg(const char *) path; 347 syscallarg(struct linux_statfs *) sp; 348 } */ *uap = v; 349 struct proc *p = l->l_proc; 350 struct statvfs btmp, *bsp; 351 struct linux_statfs ltmp; 352 struct sys_statvfs1_args bsa; 353 caddr_t sg; 354 int error; 355 356 sg = stackgap_init(p, 0); 357 bsp = (struct statvfs *) stackgap_alloc(p, &sg, sizeof (struct statvfs)); 358 359 CHECK_ALT_EXIST(p, &sg, SCARG(uap, path)); 360 361 SCARG(&bsa, path) = SCARG(uap, path); 362 SCARG(&bsa, buf) = bsp; 363 SCARG(&bsa, flags) = ST_WAIT; 364 365 if ((error = sys_statvfs1(l, &bsa, retval))) 366 return error; 367 368 if ((error = copyin((caddr_t) bsp, (caddr_t) &btmp, sizeof btmp))) 369 return error; 370 371 bsd_to_linux_statfs(&btmp, <mp); 372 373 return copyout((caddr_t) <mp, (caddr_t) SCARG(uap, sp), sizeof ltmp); 374 } 375 376 int 377 linux_sys_fstatfs(l, v, retval) 378 struct lwp *l; 379 void *v; 380 register_t *retval; 381 { 382 struct linux_sys_fstatfs_args /* { 383 syscallarg(int) fd; 384 syscallarg(struct linux_statfs *) sp; 385 } */ *uap = v; 386 struct proc *p = l->l_proc; 387 struct statvfs btmp, *bsp; 388 struct linux_statfs ltmp; 389 struct sys_fstatvfs1_args bsa; 390 caddr_t sg; 391 int error; 392 393 sg = stackgap_init(p, 0); 394 bsp = (struct statvfs *) stackgap_alloc(p, &sg, sizeof (struct statvfs)); 395 396 SCARG(&bsa, fd) = SCARG(uap, fd); 397 SCARG(&bsa, buf) = bsp; 398 SCARG(&bsa, flags) = ST_WAIT; 399 400 if ((error = sys_fstatvfs1(l, &bsa, retval))) 401 return error; 402 403 if ((error = copyin((caddr_t) bsp, (caddr_t) &btmp, sizeof btmp))) 404 return error; 405 406 bsd_to_linux_statfs(&btmp, <mp); 407 408 return copyout((caddr_t) <mp, (caddr_t) SCARG(uap, sp), sizeof ltmp); 409 } 410 411 /* 412 * uname(). Just copy the info from the various strings stored in the 413 * kernel, and put it in the Linux utsname structure. That structure 414 * is almost the same as the NetBSD one, only it has fields 65 characters 415 * long, and an extra domainname field. 416 */ 417 int 418 linux_sys_uname(l, v, retval) 419 struct lwp *l; 420 void *v; 421 register_t *retval; 422 { 423 struct linux_sys_uname_args /* { 424 syscallarg(struct linux_utsname *) up; 425 } */ *uap = v; 426 struct linux_utsname luts; 427 428 strncpy(luts.l_sysname, linux_sysname, sizeof(luts.l_sysname)); 429 strncpy(luts.l_nodename, hostname, sizeof(luts.l_nodename)); 430 strncpy(luts.l_release, linux_release, sizeof(luts.l_release)); 431 strncpy(luts.l_version, linux_version, sizeof(luts.l_version)); 432 strncpy(luts.l_machine, machine, sizeof(luts.l_machine)); 433 strncpy(luts.l_domainname, domainname, sizeof(luts.l_domainname)); 434 435 return copyout(&luts, SCARG(uap, up), sizeof(luts)); 436 } 437 438 /* Used directly on: alpha, mips, ppc, sparc, sparc64 */ 439 /* Used indirectly on: arm, i386, m68k */ 440 441 /* 442 * New type Linux mmap call. 443 * Only called directly on machines with >= 6 free regs. 444 */ 445 int 446 linux_sys_mmap(l, v, retval) 447 struct lwp *l; 448 void *v; 449 register_t *retval; 450 { 451 struct linux_sys_mmap_args /* { 452 syscallarg(unsigned long) addr; 453 syscallarg(size_t) len; 454 syscallarg(int) prot; 455 syscallarg(int) flags; 456 syscallarg(int) fd; 457 syscallarg(linux_off_t) offset; 458 } */ *uap = v; 459 460 if (SCARG(uap, offset) & PAGE_MASK) 461 return EINVAL; 462 463 return linux_mmap(l, uap, retval, SCARG(uap, offset)); 464 } 465 466 /* 467 * Guts of most architectures' mmap64() implementations. This shares 468 * its list of arguments with linux_sys_mmap(). 469 * 470 * The difference in linux_sys_mmap2() is that "offset" is actually 471 * (offset / pagesize), not an absolute byte count. This translation 472 * to pagesize offsets is done inside glibc between the mmap64() call 473 * point, and the actual syscall. 474 */ 475 int 476 linux_sys_mmap2(l, v, retval) 477 struct lwp *l; 478 void *v; 479 register_t *retval; 480 { 481 struct linux_sys_mmap2_args /* { 482 syscallarg(unsigned long) addr; 483 syscallarg(size_t) len; 484 syscallarg(int) prot; 485 syscallarg(int) flags; 486 syscallarg(int) fd; 487 syscallarg(linux_off_t) offset; 488 } */ *uap = v; 489 490 return linux_mmap(l, uap, retval, 491 ((off_t)SCARG(uap, offset)) << PAGE_SHIFT); 492 } 493 494 /* 495 * Massage arguments and call system mmap(2). 496 */ 497 static int 498 linux_mmap(l, uap, retval, offset) 499 struct lwp *l; 500 struct linux_sys_mmap_args *uap; 501 register_t *retval; 502 off_t offset; 503 { 504 struct sys_mmap_args cma; 505 int error; 506 size_t mmoff=0; 507 508 if (SCARG(uap, flags) & LINUX_MAP_GROWSDOWN) { 509 /* 510 * Request for stack-like memory segment. On linux, this 511 * works by mmap()ping (small) segment, which is automatically 512 * extended when page fault happens below the currently 513 * allocated area. We emulate this by allocating (typically 514 * bigger) segment sized at current stack size limit, and 515 * offsetting the requested and returned address accordingly. 516 * Since physical pages are only allocated on-demand, this 517 * is effectively identical. 518 */ 519 rlim_t ssl = l->l_proc->p_rlimit[RLIMIT_STACK].rlim_cur; 520 521 if (SCARG(uap, len) < ssl) { 522 /* Compute the address offset */ 523 mmoff = round_page(ssl) - SCARG(uap, len); 524 525 if (SCARG(uap, addr)) 526 SCARG(uap, addr) -= mmoff; 527 528 SCARG(uap, len) = (size_t) ssl; 529 } 530 } 531 532 linux_to_bsd_mmap_args(&cma, uap); 533 SCARG(&cma, pos) = offset; 534 535 error = sys_mmap(l, &cma, retval); 536 if (error) 537 return (error); 538 539 /* Shift the returned address for stack-like segment if necessary */ 540 if (SCARG(uap, flags) & LINUX_MAP_GROWSDOWN && mmoff) 541 retval[0] += mmoff; 542 543 return (0); 544 } 545 546 static void 547 linux_to_bsd_mmap_args(cma, uap) 548 struct sys_mmap_args *cma; 549 const struct linux_sys_mmap_args *uap; 550 { 551 int flags = MAP_TRYFIXED, fl = SCARG(uap, flags); 552 553 flags |= cvtto_bsd_mask(fl, LINUX_MAP_SHARED, MAP_SHARED); 554 flags |= cvtto_bsd_mask(fl, LINUX_MAP_PRIVATE, MAP_PRIVATE); 555 flags |= cvtto_bsd_mask(fl, LINUX_MAP_FIXED, MAP_FIXED); 556 flags |= cvtto_bsd_mask(fl, LINUX_MAP_ANON, MAP_ANON); 557 /* XXX XAX ERH: Any other flags here? There are more defined... */ 558 559 SCARG(cma, addr) = (void *)SCARG(uap, addr); 560 SCARG(cma, len) = SCARG(uap, len); 561 SCARG(cma, prot) = SCARG(uap, prot); 562 if (SCARG(cma, prot) & VM_PROT_WRITE) /* XXX */ 563 SCARG(cma, prot) |= VM_PROT_READ; 564 SCARG(cma, flags) = flags; 565 SCARG(cma, fd) = flags & MAP_ANON ? -1 : SCARG(uap, fd); 566 SCARG(cma, pad) = 0; 567 } 568 569 int 570 linux_sys_mremap(l, v, retval) 571 struct lwp *l; 572 void *v; 573 register_t *retval; 574 { 575 struct linux_sys_mremap_args /* { 576 syscallarg(void *) old_address; 577 syscallarg(size_t) old_size; 578 syscallarg(size_t) new_size; 579 syscallarg(u_long) flags; 580 } */ *uap = v; 581 struct sys_munmap_args mua; 582 size_t old_size, new_size; 583 int error; 584 585 old_size = round_page(SCARG(uap, old_size)); 586 new_size = round_page(SCARG(uap, new_size)); 587 588 /* 589 * Growing mapped region. 590 */ 591 if (new_size > old_size) { 592 /* 593 * XXX Implement me. What we probably want to do is 594 * XXX dig out the guts of the old mapping, mmap that 595 * XXX object again with the new size, then munmap 596 * XXX the old mapping. 597 */ 598 *retval = 0; 599 return (ENOMEM); 600 } 601 602 /* 603 * Shrinking mapped region. 604 */ 605 if (new_size < old_size) { 606 SCARG(&mua, addr) = (caddr_t)SCARG(uap, old_address) + 607 new_size; 608 SCARG(&mua, len) = old_size - new_size; 609 error = sys_munmap(l, &mua, retval); 610 *retval = error ? 0 : (register_t)SCARG(uap, old_address); 611 return (error); 612 } 613 614 /* 615 * No change. 616 */ 617 *retval = (register_t)SCARG(uap, old_address); 618 return (0); 619 } 620 621 int 622 linux_sys_msync(l, v, retval) 623 struct lwp *l; 624 void *v; 625 register_t *retval; 626 { 627 struct linux_sys_msync_args /* { 628 syscallarg(caddr_t) addr; 629 syscallarg(int) len; 630 syscallarg(int) fl; 631 } */ *uap = v; 632 633 struct sys___msync13_args bma; 634 635 /* flags are ignored */ 636 SCARG(&bma, addr) = SCARG(uap, addr); 637 SCARG(&bma, len) = SCARG(uap, len); 638 SCARG(&bma, flags) = SCARG(uap, fl); 639 640 return sys___msync13(l, &bma, retval); 641 } 642 643 int 644 linux_sys_mprotect(l, v, retval) 645 struct lwp *l; 646 void *v; 647 register_t *retval; 648 { 649 struct linux_sys_mprotect_args /* { 650 syscallarg(const void *) start; 651 syscallarg(unsigned long) len; 652 syscallarg(int) prot; 653 } */ *uap = v; 654 unsigned long end, start = (unsigned long)SCARG(uap, start), len; 655 int prot = SCARG(uap, prot); 656 struct vm_map_entry *entry; 657 struct vm_map *map = &l->l_proc->p_vmspace->vm_map; 658 659 if (start & PAGE_MASK) 660 return EINVAL; 661 662 len = round_page(SCARG(uap, len)); 663 end = start + len; 664 665 if (end < start) 666 return EINVAL; 667 else if (end == start) 668 return 0; 669 670 if (SCARG(uap, prot) & ~(PROT_READ | PROT_WRITE | PROT_EXEC)) 671 return EINVAL; 672 673 vm_map_lock(map); 674 #ifdef notdef 675 VM_MAP_RANGE_CHECK(map, start, end); 676 #endif 677 if (!uvm_map_lookup_entry(map, start, &entry) || entry->start > start) { 678 vm_map_unlock(map); 679 return ENOMEM; 680 } 681 vm_map_unlock(map); 682 return uvm_map_protect(map, start, end, prot, FALSE); 683 } 684 685 /* 686 * This code is partly stolen from src/lib/libc/compat-43/times.c 687 */ 688 689 #define CONVTCK(r) (r.tv_sec * hz + r.tv_usec / (1000000 / hz)) 690 691 int 692 linux_sys_times(l, v, retval) 693 struct lwp *l; 694 void *v; 695 register_t *retval; 696 { 697 struct linux_sys_times_args /* { 698 syscallarg(struct times *) tms; 699 } */ *uap = v; 700 struct proc *p = l->l_proc; 701 struct timeval t; 702 int error, s; 703 704 if (SCARG(uap, tms)) { 705 struct linux_tms ltms; 706 struct rusage ru; 707 708 calcru(p, &ru.ru_utime, &ru.ru_stime, NULL); 709 ltms.ltms_utime = CONVTCK(ru.ru_utime); 710 ltms.ltms_stime = CONVTCK(ru.ru_stime); 711 712 ltms.ltms_cutime = CONVTCK(p->p_stats->p_cru.ru_utime); 713 ltms.ltms_cstime = CONVTCK(p->p_stats->p_cru.ru_stime); 714 715 if ((error = copyout(<ms, SCARG(uap, tms), sizeof ltms))) 716 return error; 717 } 718 719 s = splclock(); 720 timersub(&time, &boottime, &t); 721 splx(s); 722 723 retval[0] = ((linux_clock_t)(CONVTCK(t))); 724 return 0; 725 } 726 727 #undef CONVTCK 728 729 /* 730 * Linux 'readdir' call. This code is mostly taken from the 731 * SunOS getdents call (see compat/sunos/sunos_misc.c), though 732 * an attempt has been made to keep it a little cleaner (failing 733 * miserably, because of the cruft needed if count 1 is passed). 734 * 735 * The d_off field should contain the offset of the next valid entry, 736 * but in Linux it has the offset of the entry itself. We emulate 737 * that bug here. 738 * 739 * Read in BSD-style entries, convert them, and copy them out. 740 * 741 * Note that this doesn't handle union-mounted filesystems. 742 */ 743 int 744 linux_sys_getdents(l, v, retval) 745 struct lwp *l; 746 void *v; 747 register_t *retval; 748 { 749 struct linux_sys_getdents_args /* { 750 syscallarg(int) fd; 751 syscallarg(struct linux_dirent *) dent; 752 syscallarg(unsigned int) count; 753 } */ *uap = v; 754 struct proc *p = l->l_proc; 755 struct dirent *bdp; 756 struct vnode *vp; 757 caddr_t inp, buf; /* BSD-format */ 758 int len, reclen; /* BSD-format */ 759 caddr_t outp; /* Linux-format */ 760 int resid, linux_reclen = 0; /* Linux-format */ 761 struct file *fp; 762 struct uio auio; 763 struct iovec aiov; 764 struct linux_dirent idb; 765 off_t off; /* true file offset */ 766 int buflen, error, eofflag, nbytes, oldcall; 767 struct vattr va; 768 off_t *cookiebuf = NULL, *cookie; 769 int ncookies; 770 771 /* getvnode() will use the descriptor for us */ 772 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 773 return (error); 774 775 if ((fp->f_flag & FREAD) == 0) { 776 error = EBADF; 777 goto out1; 778 } 779 780 vp = (struct vnode *)fp->f_data; 781 if (vp->v_type != VDIR) { 782 error = EINVAL; 783 goto out1; 784 } 785 786 if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p))) 787 goto out1; 788 789 nbytes = SCARG(uap, count); 790 if (nbytes == 1) { /* emulating old, broken behaviour */ 791 nbytes = sizeof (idb); 792 buflen = max(va.va_blocksize, nbytes); 793 oldcall = 1; 794 } else { 795 buflen = min(MAXBSIZE, nbytes); 796 if (buflen < va.va_blocksize) 797 buflen = va.va_blocksize; 798 oldcall = 0; 799 } 800 buf = malloc(buflen, M_TEMP, M_WAITOK); 801 802 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 803 off = fp->f_offset; 804 again: 805 aiov.iov_base = buf; 806 aiov.iov_len = buflen; 807 auio.uio_iov = &aiov; 808 auio.uio_iovcnt = 1; 809 auio.uio_rw = UIO_READ; 810 auio.uio_segflg = UIO_SYSSPACE; 811 auio.uio_procp = p; 812 auio.uio_resid = buflen; 813 auio.uio_offset = off; 814 /* 815 * First we read into the malloc'ed buffer, then 816 * we massage it into user space, one record at a time. 817 */ 818 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, &cookiebuf, 819 &ncookies); 820 if (error) 821 goto out; 822 823 inp = buf; 824 outp = (caddr_t)SCARG(uap, dent); 825 resid = nbytes; 826 if ((len = buflen - auio.uio_resid) == 0) 827 goto eof; 828 829 for (cookie = cookiebuf; len > 0; len -= reclen) { 830 bdp = (struct dirent *)inp; 831 reclen = bdp->d_reclen; 832 if (reclen & 3) 833 panic("linux_readdir"); 834 if (bdp->d_fileno == 0) { 835 inp += reclen; /* it is a hole; squish it out */ 836 off = *cookie++; 837 continue; 838 } 839 linux_reclen = LINUX_RECLEN(&idb, bdp->d_namlen); 840 if (reclen > len || resid < linux_reclen) { 841 /* entry too big for buffer, so just stop */ 842 outp++; 843 break; 844 } 845 /* 846 * Massage in place to make a Linux-shaped dirent (otherwise 847 * we have to worry about touching user memory outside of 848 * the copyout() call). 849 */ 850 idb.d_ino = bdp->d_fileno; 851 /* 852 * The old readdir() call misuses the offset and reclen fields. 853 */ 854 if (oldcall) { 855 idb.d_off = (linux_off_t)linux_reclen; 856 idb.d_reclen = (u_short)bdp->d_namlen; 857 } else { 858 if (sizeof (idb.d_off) <= 4 && (off >> 32) != 0) { 859 compat_offseterr(vp, "linux_getdents"); 860 error = EINVAL; 861 goto out; 862 } 863 idb.d_off = (linux_off_t)off; 864 idb.d_reclen = (u_short)linux_reclen; 865 } 866 strcpy(idb.d_name, bdp->d_name); 867 if ((error = copyout((caddr_t)&idb, outp, linux_reclen))) 868 goto out; 869 /* advance past this real entry */ 870 inp += reclen; 871 off = *cookie++; /* each entry points to itself */ 872 /* advance output past Linux-shaped entry */ 873 outp += linux_reclen; 874 resid -= linux_reclen; 875 if (oldcall) 876 break; 877 } 878 879 /* if we squished out the whole block, try again */ 880 if (outp == (caddr_t)SCARG(uap, dent)) 881 goto again; 882 fp->f_offset = off; /* update the vnode offset */ 883 884 if (oldcall) 885 nbytes = resid + linux_reclen; 886 887 eof: 888 *retval = nbytes - resid; 889 out: 890 VOP_UNLOCK(vp, 0); 891 if (cookiebuf) 892 free(cookiebuf, M_TEMP); 893 free(buf, M_TEMP); 894 out1: 895 FILE_UNUSE(fp, p); 896 return error; 897 } 898 899 /* 900 * Even when just using registers to pass arguments to syscalls you can 901 * have 5 of them on the i386. So this newer version of select() does 902 * this. 903 */ 904 int 905 linux_sys_select(l, v, retval) 906 struct lwp *l; 907 void *v; 908 register_t *retval; 909 { 910 struct linux_sys_select_args /* { 911 syscallarg(int) nfds; 912 syscallarg(fd_set *) readfds; 913 syscallarg(fd_set *) writefds; 914 syscallarg(fd_set *) exceptfds; 915 syscallarg(struct timeval *) timeout; 916 } */ *uap = v; 917 918 return linux_select1(l, retval, SCARG(uap, nfds), SCARG(uap, readfds), 919 SCARG(uap, writefds), SCARG(uap, exceptfds), SCARG(uap, timeout)); 920 } 921 922 /* 923 * Common code for the old and new versions of select(). A couple of 924 * things are important: 925 * 1) return the amount of time left in the 'timeout' parameter 926 * 2) select never returns ERESTART on Linux, always return EINTR 927 */ 928 int 929 linux_select1(l, retval, nfds, readfds, writefds, exceptfds, timeout) 930 struct lwp *l; 931 register_t *retval; 932 int nfds; 933 fd_set *readfds, *writefds, *exceptfds; 934 struct timeval *timeout; 935 { 936 struct sys_select_args bsa; 937 struct proc *p = l->l_proc; 938 struct timeval tv0, tv1, utv, *tvp; 939 caddr_t sg; 940 int error; 941 942 SCARG(&bsa, nd) = nfds; 943 SCARG(&bsa, in) = readfds; 944 SCARG(&bsa, ou) = writefds; 945 SCARG(&bsa, ex) = exceptfds; 946 SCARG(&bsa, tv) = timeout; 947 948 /* 949 * Store current time for computation of the amount of 950 * time left. 951 */ 952 if (timeout) { 953 if ((error = copyin(timeout, &utv, sizeof(utv)))) 954 return error; 955 if (itimerfix(&utv)) { 956 /* 957 * The timeval was invalid. Convert it to something 958 * valid that will act as it does under Linux. 959 */ 960 sg = stackgap_init(p, 0); 961 tvp = stackgap_alloc(p, &sg, sizeof(utv)); 962 utv.tv_sec += utv.tv_usec / 1000000; 963 utv.tv_usec %= 1000000; 964 if (utv.tv_usec < 0) { 965 utv.tv_sec -= 1; 966 utv.tv_usec += 1000000; 967 } 968 if (utv.tv_sec < 0) 969 timerclear(&utv); 970 if ((error = copyout(&utv, tvp, sizeof(utv)))) 971 return error; 972 SCARG(&bsa, tv) = tvp; 973 } 974 microtime(&tv0); 975 } 976 977 error = sys_select(l, &bsa, retval); 978 if (error) { 979 /* 980 * See fs/select.c in the Linux kernel. Without this, 981 * Maelstrom doesn't work. 982 */ 983 if (error == ERESTART) 984 error = EINTR; 985 return error; 986 } 987 988 if (timeout) { 989 if (*retval) { 990 /* 991 * Compute how much time was left of the timeout, 992 * by subtracting the current time and the time 993 * before we started the call, and subtracting 994 * that result from the user-supplied value. 995 */ 996 microtime(&tv1); 997 timersub(&tv1, &tv0, &tv1); 998 timersub(&utv, &tv1, &utv); 999 if (utv.tv_sec < 0) 1000 timerclear(&utv); 1001 } else 1002 timerclear(&utv); 1003 if ((error = copyout(&utv, timeout, sizeof(utv)))) 1004 return error; 1005 } 1006 1007 return 0; 1008 } 1009 1010 /* 1011 * Get the process group of a certain process. Look it up 1012 * and return the value. 1013 */ 1014 int 1015 linux_sys_getpgid(l, v, retval) 1016 struct lwp *l; 1017 void *v; 1018 register_t *retval; 1019 { 1020 struct linux_sys_getpgid_args /* { 1021 syscallarg(int) pid; 1022 } */ *uap = v; 1023 struct proc *p = l->l_proc; 1024 struct proc *targp; 1025 1026 if (SCARG(uap, pid) != 0 && SCARG(uap, pid) != p->p_pid) { 1027 if ((targp = pfind(SCARG(uap, pid))) == 0) 1028 return ESRCH; 1029 } 1030 else 1031 targp = p; 1032 1033 retval[0] = targp->p_pgid; 1034 return 0; 1035 } 1036 1037 /* 1038 * Set the 'personality' (emulation mode) for the current process. Only 1039 * accept the Linux personality here (0). This call is needed because 1040 * the Linux ELF crt0 issues it in an ugly kludge to make sure that 1041 * ELF binaries run in Linux mode, not SVR4 mode. 1042 */ 1043 int 1044 linux_sys_personality(l, v, retval) 1045 struct lwp *l; 1046 void *v; 1047 register_t *retval; 1048 { 1049 struct linux_sys_personality_args /* { 1050 syscallarg(int) per; 1051 } */ *uap = v; 1052 1053 if (SCARG(uap, per) != 0) 1054 return EINVAL; 1055 retval[0] = 0; 1056 return 0; 1057 } 1058 1059 #if defined(__i386__) || defined(__m68k__) 1060 /* 1061 * The calls are here because of type conversions. 1062 */ 1063 int 1064 linux_sys_setreuid16(l, v, retval) 1065 struct lwp *l; 1066 void *v; 1067 register_t *retval; 1068 { 1069 struct linux_sys_setreuid16_args /* { 1070 syscallarg(int) ruid; 1071 syscallarg(int) euid; 1072 } */ *uap = v; 1073 struct sys_setreuid_args bsa; 1074 1075 SCARG(&bsa, ruid) = ((linux_uid_t)SCARG(uap, ruid) == (linux_uid_t)-1) ? 1076 (uid_t)-1 : SCARG(uap, ruid); 1077 SCARG(&bsa, euid) = ((linux_uid_t)SCARG(uap, euid) == (linux_uid_t)-1) ? 1078 (uid_t)-1 : SCARG(uap, euid); 1079 1080 return sys_setreuid(l, &bsa, retval); 1081 } 1082 1083 int 1084 linux_sys_setregid16(l, v, retval) 1085 struct lwp *l; 1086 void *v; 1087 register_t *retval; 1088 { 1089 struct linux_sys_setregid16_args /* { 1090 syscallarg(int) rgid; 1091 syscallarg(int) egid; 1092 } */ *uap = v; 1093 struct sys_setregid_args bsa; 1094 1095 SCARG(&bsa, rgid) = ((linux_gid_t)SCARG(uap, rgid) == (linux_gid_t)-1) ? 1096 (uid_t)-1 : SCARG(uap, rgid); 1097 SCARG(&bsa, egid) = ((linux_gid_t)SCARG(uap, egid) == (linux_gid_t)-1) ? 1098 (uid_t)-1 : SCARG(uap, egid); 1099 1100 return sys_setregid(l, &bsa, retval); 1101 } 1102 1103 int 1104 linux_sys_setresuid16(l, v, retval) 1105 struct lwp *l; 1106 void *v; 1107 register_t *retval; 1108 { 1109 struct linux_sys_setresuid16_args /* { 1110 syscallarg(uid_t) ruid; 1111 syscallarg(uid_t) euid; 1112 syscallarg(uid_t) suid; 1113 } */ *uap = v; 1114 struct linux_sys_setresuid16_args lsa; 1115 1116 SCARG(&lsa, ruid) = ((linux_uid_t)SCARG(uap, ruid) == (linux_uid_t)-1) ? 1117 (uid_t)-1 : SCARG(uap, ruid); 1118 SCARG(&lsa, euid) = ((linux_uid_t)SCARG(uap, euid) == (linux_uid_t)-1) ? 1119 (uid_t)-1 : SCARG(uap, euid); 1120 SCARG(&lsa, suid) = ((linux_uid_t)SCARG(uap, suid) == (linux_uid_t)-1) ? 1121 (uid_t)-1 : SCARG(uap, suid); 1122 1123 return linux_sys_setresuid(l, &lsa, retval); 1124 } 1125 1126 int 1127 linux_sys_setresgid16(l, v, retval) 1128 struct lwp *l; 1129 void *v; 1130 register_t *retval; 1131 { 1132 struct linux_sys_setresgid16_args /* { 1133 syscallarg(gid_t) rgid; 1134 syscallarg(gid_t) egid; 1135 syscallarg(gid_t) sgid; 1136 } */ *uap = v; 1137 struct linux_sys_setresgid16_args lsa; 1138 1139 SCARG(&lsa, rgid) = ((linux_gid_t)SCARG(uap, rgid) == (linux_gid_t)-1) ? 1140 (gid_t)-1 : SCARG(uap, rgid); 1141 SCARG(&lsa, egid) = ((linux_gid_t)SCARG(uap, egid) == (linux_gid_t)-1) ? 1142 (gid_t)-1 : SCARG(uap, egid); 1143 SCARG(&lsa, sgid) = ((linux_gid_t)SCARG(uap, sgid) == (linux_gid_t)-1) ? 1144 (gid_t)-1 : SCARG(uap, sgid); 1145 1146 return linux_sys_setresgid(l, &lsa, retval); 1147 } 1148 1149 int 1150 linux_sys_getgroups16(l, v, retval) 1151 struct lwp *l; 1152 void *v; 1153 register_t *retval; 1154 { 1155 struct linux_sys_getgroups16_args /* { 1156 syscallarg(int) gidsetsize; 1157 syscallarg(linux_gid_t *) gidset; 1158 } */ *uap = v; 1159 struct proc *p = l->l_proc; 1160 caddr_t sg; 1161 int n, error, i; 1162 struct sys_getgroups_args bsa; 1163 gid_t *bset, *kbset; 1164 linux_gid_t *lset; 1165 struct pcred *pc = p->p_cred; 1166 1167 n = SCARG(uap, gidsetsize); 1168 if (n < 0) 1169 return EINVAL; 1170 error = 0; 1171 bset = kbset = NULL; 1172 lset = NULL; 1173 if (n > 0) { 1174 n = min(pc->pc_ucred->cr_ngroups, n); 1175 sg = stackgap_init(p, 0); 1176 bset = stackgap_alloc(p, &sg, n * sizeof (gid_t)); 1177 kbset = malloc(n * sizeof (gid_t), M_TEMP, M_WAITOK); 1178 lset = malloc(n * sizeof (linux_gid_t), M_TEMP, M_WAITOK); 1179 if (bset == NULL || kbset == NULL || lset == NULL) 1180 return ENOMEM; 1181 SCARG(&bsa, gidsetsize) = n; 1182 SCARG(&bsa, gidset) = bset; 1183 error = sys_getgroups(l, &bsa, retval); 1184 if (error != 0) 1185 goto out; 1186 error = copyin(bset, kbset, n * sizeof (gid_t)); 1187 if (error != 0) 1188 goto out; 1189 for (i = 0; i < n; i++) 1190 lset[i] = (linux_gid_t)kbset[i]; 1191 error = copyout(lset, SCARG(uap, gidset), 1192 n * sizeof (linux_gid_t)); 1193 } else 1194 *retval = pc->pc_ucred->cr_ngroups; 1195 out: 1196 if (kbset != NULL) 1197 free(kbset, M_TEMP); 1198 if (lset != NULL) 1199 free(lset, M_TEMP); 1200 return error; 1201 } 1202 1203 int 1204 linux_sys_setgroups16(l, v, retval) 1205 struct lwp *l; 1206 void *v; 1207 register_t *retval; 1208 { 1209 struct linux_sys_setgroups16_args /* { 1210 syscallarg(int) gidsetsize; 1211 syscallarg(linux_gid_t *) gidset; 1212 } */ *uap = v; 1213 struct proc *p = l->l_proc; 1214 caddr_t sg; 1215 int n; 1216 int error, i; 1217 struct sys_setgroups_args bsa; 1218 gid_t *bset, *kbset; 1219 linux_gid_t *lset; 1220 1221 n = SCARG(uap, gidsetsize); 1222 if (n < 0 || n > NGROUPS) 1223 return EINVAL; 1224 sg = stackgap_init(p, 0); 1225 bset = stackgap_alloc(p, &sg, n * sizeof (gid_t)); 1226 lset = malloc(n * sizeof (linux_gid_t), M_TEMP, M_WAITOK); 1227 kbset = malloc(n * sizeof (gid_t), M_TEMP, M_WAITOK); 1228 if (lset == NULL || bset == NULL) 1229 return ENOMEM; 1230 error = copyin(SCARG(uap, gidset), lset, n * sizeof (linux_gid_t)); 1231 if (error != 0) 1232 goto out; 1233 for (i = 0; i < n; i++) 1234 kbset[i] = (gid_t)lset[i]; 1235 error = copyout(kbset, bset, n * sizeof (gid_t)); 1236 if (error != 0) 1237 goto out; 1238 SCARG(&bsa, gidsetsize) = n; 1239 SCARG(&bsa, gidset) = bset; 1240 error = sys_setgroups(l, &bsa, retval); 1241 1242 out: 1243 if (lset != NULL) 1244 free(lset, M_TEMP); 1245 if (kbset != NULL) 1246 free(kbset, M_TEMP); 1247 1248 return error; 1249 } 1250 1251 #endif /* __i386__ || __m68k__ */ 1252 1253 /* 1254 * We have nonexistent fsuid equal to uid. 1255 * If modification is requested, refuse. 1256 */ 1257 int 1258 linux_sys_setfsuid(l, v, retval) 1259 struct lwp *l; 1260 void *v; 1261 register_t *retval; 1262 { 1263 struct linux_sys_setfsuid_args /* { 1264 syscallarg(uid_t) uid; 1265 } */ *uap = v; 1266 struct proc *p = l->l_proc; 1267 uid_t uid; 1268 1269 uid = SCARG(uap, uid); 1270 if (p->p_cred->p_ruid != uid) 1271 return sys_nosys(l, v, retval); 1272 else 1273 return (0); 1274 } 1275 1276 /* XXX XXX XXX */ 1277 #ifndef alpha 1278 int 1279 linux_sys_getfsuid(l, v, retval) 1280 struct lwp *l; 1281 void *v; 1282 register_t *retval; 1283 { 1284 return sys_getuid(l, v, retval); 1285 } 1286 #endif 1287 1288 int 1289 linux_sys_setresuid(l, v, retval) 1290 struct lwp *l; 1291 void *v; 1292 register_t *retval; 1293 { 1294 struct linux_sys_setresuid_args /* { 1295 syscallarg(uid_t) ruid; 1296 syscallarg(uid_t) euid; 1297 syscallarg(uid_t) suid; 1298 } */ *uap = v; 1299 1300 /* 1301 * Note: These checks are a little different than the NetBSD 1302 * setreuid(2) call performs. This precisely follows the 1303 * behavior of the Linux kernel. 1304 */ 1305 1306 return do_setresuid(l, SCARG(uap, ruid), SCARG(uap, euid), 1307 SCARG(uap, suid), 1308 ID_R_EQ_R | ID_R_EQ_E | ID_R_EQ_S | 1309 ID_E_EQ_R | ID_E_EQ_E | ID_E_EQ_S | 1310 ID_S_EQ_R | ID_S_EQ_E | ID_S_EQ_S ); 1311 } 1312 1313 int 1314 linux_sys_getresuid(l, v, retval) 1315 struct lwp *l; 1316 void *v; 1317 register_t *retval; 1318 { 1319 struct linux_sys_getresuid_args /* { 1320 syscallarg(uid_t *) ruid; 1321 syscallarg(uid_t *) euid; 1322 syscallarg(uid_t *) suid; 1323 } */ *uap = v; 1324 struct proc *p = l->l_proc; 1325 struct pcred *pc = p->p_cred; 1326 int error; 1327 1328 /* 1329 * Linux copies these values out to userspace like so: 1330 * 1331 * 1. Copy out ruid. 1332 * 2. If that succeeds, copy out euid. 1333 * 3. If both of those succeed, copy out suid. 1334 */ 1335 if ((error = copyout(&pc->p_ruid, SCARG(uap, ruid), 1336 sizeof(uid_t))) != 0) 1337 return (error); 1338 1339 if ((error = copyout(&pc->pc_ucred->cr_uid, SCARG(uap, euid), 1340 sizeof(uid_t))) != 0) 1341 return (error); 1342 1343 return (copyout(&pc->p_svuid, SCARG(uap, suid), sizeof(uid_t))); 1344 } 1345 1346 int 1347 linux_sys_ptrace(l, v, retval) 1348 struct lwp *l; 1349 void *v; 1350 register_t *retval; 1351 { 1352 struct linux_sys_ptrace_args /* { 1353 i386, m68k, powerpc: T=int 1354 alpha: T=long 1355 syscallarg(T) request; 1356 syscallarg(T) pid; 1357 syscallarg(T) addr; 1358 syscallarg(T) data; 1359 } */ *uap = v; 1360 const int *ptr; 1361 int request; 1362 int error; 1363 1364 ptr = linux_ptrace_request_map; 1365 request = SCARG(uap, request); 1366 while (*ptr != -1) 1367 if (*ptr++ == request) { 1368 struct sys_ptrace_args pta; 1369 1370 SCARG(&pta, req) = *ptr; 1371 SCARG(&pta, pid) = SCARG(uap, pid); 1372 SCARG(&pta, addr) = (caddr_t)SCARG(uap, addr); 1373 SCARG(&pta, data) = SCARG(uap, data); 1374 1375 /* 1376 * Linux ptrace(PTRACE_CONT, pid, 0, 0) means actually 1377 * to continue where the process left off previously. 1378 * The same thing is achieved by addr == (caddr_t) 1 1379 * on NetBSD, so rewrite 'addr' appropriately. 1380 */ 1381 if (request == LINUX_PTRACE_CONT && SCARG(uap, addr)==0) 1382 SCARG(&pta, addr) = (caddr_t) 1; 1383 1384 error = sys_ptrace(l, &pta, retval); 1385 if (error) 1386 return error; 1387 switch (request) { 1388 case LINUX_PTRACE_PEEKTEXT: 1389 case LINUX_PTRACE_PEEKDATA: 1390 error = copyout (retval, 1391 (caddr_t)SCARG(uap, data), sizeof *retval); 1392 *retval = SCARG(uap, data); 1393 break; 1394 default: 1395 break; 1396 } 1397 return error; 1398 } 1399 else 1400 ptr++; 1401 1402 return LINUX_SYS_PTRACE_ARCH(l, uap, retval); 1403 } 1404 1405 int 1406 linux_sys_reboot(struct lwp *l, void *v, register_t *retval) 1407 { 1408 struct linux_sys_reboot_args /* { 1409 syscallarg(int) magic1; 1410 syscallarg(int) magic2; 1411 syscallarg(int) cmd; 1412 syscallarg(void *) arg; 1413 } */ *uap = v; 1414 struct sys_reboot_args /* { 1415 syscallarg(int) opt; 1416 syscallarg(char *) bootstr; 1417 } */ sra; 1418 struct proc *p = l->l_proc; 1419 int error; 1420 1421 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 1422 return(error); 1423 1424 if (SCARG(uap, magic1) != LINUX_REBOOT_MAGIC1) 1425 return(EINVAL); 1426 if (SCARG(uap, magic2) != LINUX_REBOOT_MAGIC2 && 1427 SCARG(uap, magic2) != LINUX_REBOOT_MAGIC2A && 1428 SCARG(uap, magic2) != LINUX_REBOOT_MAGIC2B) 1429 return(EINVAL); 1430 1431 switch (SCARG(uap, cmd)) { 1432 case LINUX_REBOOT_CMD_RESTART: 1433 SCARG(&sra, opt) = RB_AUTOBOOT; 1434 break; 1435 case LINUX_REBOOT_CMD_HALT: 1436 SCARG(&sra, opt) = RB_HALT; 1437 break; 1438 case LINUX_REBOOT_CMD_POWER_OFF: 1439 SCARG(&sra, opt) = RB_HALT|RB_POWERDOWN; 1440 break; 1441 case LINUX_REBOOT_CMD_RESTART2: 1442 /* Reboot with an argument. */ 1443 SCARG(&sra, opt) = RB_AUTOBOOT|RB_STRING; 1444 SCARG(&sra, bootstr) = SCARG(uap, arg); 1445 break; 1446 case LINUX_REBOOT_CMD_CAD_ON: 1447 return(EINVAL); /* We don't implement ctrl-alt-delete */ 1448 case LINUX_REBOOT_CMD_CAD_OFF: 1449 return(0); 1450 default: 1451 return(EINVAL); 1452 } 1453 1454 return(sys_reboot(l, &sra, retval)); 1455 } 1456 1457 /* 1458 * Copy of compat_12_sys_swapon(). 1459 */ 1460 int 1461 linux_sys_swapon(l, v, retval) 1462 struct lwp *l; 1463 void *v; 1464 register_t *retval; 1465 { 1466 struct sys_swapctl_args ua; 1467 struct linux_sys_swapon_args /* { 1468 syscallarg(const char *) name; 1469 } */ *uap = v; 1470 1471 SCARG(&ua, cmd) = SWAP_ON; 1472 SCARG(&ua, arg) = (void *)SCARG(uap, name); 1473 SCARG(&ua, misc) = 0; /* priority */ 1474 return (sys_swapctl(l, &ua, retval)); 1475 } 1476 1477 /* 1478 * Stop swapping to the file or block device specified by path. 1479 */ 1480 int 1481 linux_sys_swapoff(l, v, retval) 1482 struct lwp *l; 1483 void *v; 1484 register_t *retval; 1485 { 1486 struct sys_swapctl_args ua; 1487 struct linux_sys_swapoff_args /* { 1488 syscallarg(const char *) path; 1489 } */ *uap = v; 1490 1491 SCARG(&ua, cmd) = SWAP_OFF; 1492 SCARG(&ua, arg) = (void *)SCARG(uap, path); 1493 return (sys_swapctl(l, &ua, retval)); 1494 } 1495 1496 /* 1497 * Copy of compat_09_sys_setdomainname() 1498 */ 1499 /* ARGSUSED */ 1500 int 1501 linux_sys_setdomainname(l, v, retval) 1502 struct lwp *l; 1503 void *v; 1504 register_t *retval; 1505 { 1506 struct linux_sys_setdomainname_args /* { 1507 syscallarg(char *) domainname; 1508 syscallarg(int) len; 1509 } */ *uap = v; 1510 int name[2]; 1511 1512 name[0] = CTL_KERN; 1513 name[1] = KERN_DOMAINNAME; 1514 return (old_sysctl(&name[0], 2, 0, 0, SCARG(uap, domainname), 1515 SCARG(uap, len), l)); 1516 } 1517 1518 /* 1519 * sysinfo() 1520 */ 1521 /* ARGSUSED */ 1522 int 1523 linux_sys_sysinfo(l, v, retval) 1524 struct lwp *l; 1525 void *v; 1526 register_t *retval; 1527 { 1528 struct linux_sys_sysinfo_args /* { 1529 syscallarg(struct linux_sysinfo *) arg; 1530 } */ *uap = v; 1531 struct linux_sysinfo si; 1532 struct loadavg *la; 1533 1534 si.uptime = time.tv_sec - boottime.tv_sec; 1535 la = &averunnable; 1536 si.loads[0] = la->ldavg[0] * LINUX_SYSINFO_LOADS_SCALE / la->fscale; 1537 si.loads[1] = la->ldavg[1] * LINUX_SYSINFO_LOADS_SCALE / la->fscale; 1538 si.loads[2] = la->ldavg[2] * LINUX_SYSINFO_LOADS_SCALE / la->fscale; 1539 si.totalram = ctob(physmem); 1540 si.freeram = uvmexp.free * uvmexp.pagesize; 1541 si.sharedram = 0; /* XXX */ 1542 si.bufferram = uvmexp.filepages * uvmexp.pagesize; 1543 si.totalswap = uvmexp.swpages * uvmexp.pagesize; 1544 si.freeswap = (uvmexp.swpages - uvmexp.swpginuse) * uvmexp.pagesize; 1545 si.procs = nprocs; 1546 1547 /* The following are only present in newer Linux kernels. */ 1548 si.totalbig = 0; 1549 si.freebig = 0; 1550 si.mem_unit = 1; 1551 1552 return (copyout(&si, SCARG(uap, arg), sizeof si)); 1553 } 1554 1555 #define bsd_to_linux_rlimit1(l, b, f) \ 1556 (l)->f = ((b)->f == RLIM_INFINITY || \ 1557 ((b)->f & 0xffffffff00000000ULL) != 0) ? \ 1558 LINUX_RLIM_INFINITY : (int32_t)(b)->f 1559 #define bsd_to_linux_rlimit(l, b) \ 1560 bsd_to_linux_rlimit1(l, b, rlim_cur); \ 1561 bsd_to_linux_rlimit1(l, b, rlim_max) 1562 1563 #define linux_to_bsd_rlimit1(b, l, f) \ 1564 (b)->f = (l)->f == LINUX_RLIM_INFINITY ? RLIM_INFINITY : (l)->f 1565 #define linux_to_bsd_rlimit(b, l) \ 1566 linux_to_bsd_rlimit1(b, l, rlim_cur); \ 1567 linux_to_bsd_rlimit1(b, l, rlim_max) 1568 1569 static int 1570 linux_to_bsd_limit(lim) 1571 int lim; 1572 { 1573 switch (lim) { 1574 case LINUX_RLIMIT_CPU: 1575 return RLIMIT_CPU; 1576 case LINUX_RLIMIT_FSIZE: 1577 return RLIMIT_FSIZE; 1578 case LINUX_RLIMIT_DATA: 1579 return RLIMIT_DATA; 1580 case LINUX_RLIMIT_STACK: 1581 return RLIMIT_STACK; 1582 case LINUX_RLIMIT_CORE: 1583 return RLIMIT_CORE; 1584 case LINUX_RLIMIT_RSS: 1585 return RLIMIT_RSS; 1586 case LINUX_RLIMIT_NPROC: 1587 return RLIMIT_NPROC; 1588 case LINUX_RLIMIT_NOFILE: 1589 return RLIMIT_NOFILE; 1590 case LINUX_RLIMIT_MEMLOCK: 1591 return RLIMIT_MEMLOCK; 1592 case LINUX_RLIMIT_AS: 1593 case LINUX_RLIMIT_LOCKS: 1594 return -EOPNOTSUPP; 1595 default: 1596 return -EINVAL; 1597 } 1598 } 1599 1600 1601 int 1602 linux_sys_getrlimit(l, v, retval) 1603 struct lwp *l; 1604 void *v; 1605 register_t *retval; 1606 { 1607 struct linux_sys_getrlimit_args /* { 1608 syscallarg(int) which; 1609 syscallarg(struct orlimit *) rlp; 1610 } */ *uap = v; 1611 struct proc *p = l->l_proc; 1612 caddr_t sg = stackgap_init(p, 0); 1613 struct sys_getrlimit_args ap; 1614 struct rlimit rl; 1615 struct orlimit orl; 1616 int error; 1617 1618 SCARG(&ap, which) = linux_to_bsd_limit(SCARG(uap, which)); 1619 if ((error = SCARG(&ap, which)) < 0) 1620 return -error; 1621 SCARG(&ap, rlp) = stackgap_alloc(p, &sg, sizeof rl); 1622 if ((error = sys_getrlimit(l, &ap, retval)) != 0) 1623 return error; 1624 if ((error = copyin(SCARG(&ap, rlp), &rl, sizeof(rl))) != 0) 1625 return error; 1626 bsd_to_linux_rlimit(&orl, &rl); 1627 return copyout(&orl, SCARG(uap, rlp), sizeof(orl)); 1628 } 1629 1630 int 1631 linux_sys_setrlimit(l, v, retval) 1632 struct lwp *l; 1633 void *v; 1634 register_t *retval; 1635 { 1636 struct linux_sys_setrlimit_args /* { 1637 syscallarg(int) which; 1638 syscallarg(struct orlimit *) rlp; 1639 } */ *uap = v; 1640 struct proc *p = l->l_proc; 1641 caddr_t sg = stackgap_init(p, 0); 1642 struct sys_setrlimit_args ap; 1643 struct rlimit rl; 1644 struct orlimit orl; 1645 int error; 1646 1647 SCARG(&ap, which) = linux_to_bsd_limit(SCARG(uap, which)); 1648 SCARG(&ap, rlp) = stackgap_alloc(p, &sg, sizeof rl); 1649 if ((error = SCARG(&ap, which)) < 0) 1650 return -error; 1651 if ((error = copyin(SCARG(uap, rlp), &orl, sizeof(orl))) != 0) 1652 return error; 1653 linux_to_bsd_rlimit(&rl, &orl); 1654 /* XXX: alpha complains about this */ 1655 if ((error = copyout(&rl, (void *)SCARG(&ap, rlp), sizeof(rl))) != 0) 1656 return error; 1657 return sys_setrlimit(l, &ap, retval); 1658 } 1659 1660 #ifndef __mips__ 1661 /* XXX: this doesn't look 100% common, at least mips doesn't have it */ 1662 int 1663 linux_sys_ugetrlimit(l, v, retval) 1664 struct lwp *l; 1665 void *v; 1666 register_t *retval; 1667 { 1668 return linux_sys_getrlimit(l, v, retval); 1669 } 1670 #endif 1671 1672 /* 1673 * This gets called for unsupported syscalls. The difference to sys_nosys() 1674 * is that process does not get SIGSYS, the call just returns with ENOSYS. 1675 * This is the way Linux does it and glibc depends on this behaviour. 1676 */ 1677 int 1678 linux_sys_nosys(l, v, retval) 1679 struct lwp *l; 1680 void *v; 1681 register_t *retval; 1682 { 1683 return (ENOSYS); 1684 } 1685