Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/compat/linux/common/linux_misc.c
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1 /* $NetBSD: linux_misc.c,v 1.122.2.4 2004/11/12 06:18:59 jmc 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 1.122.2.4 2004/11/12 06:18:59 jmc 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((struct statfs *, struct linux_statfs *)); 172 static int linux_to_bsd_limit __P((int)); 173 static void linux_to_bsd_mmap_args __P((struct sys_mmap_args *, 174 const struct linux_sys_mmap_args *)); 175 static int linux_mmap __P((struct lwp *, struct linux_sys_mmap_args *, 176 register_t *, off_t)); 177 178 179 /* 180 * The information on a terminated (or stopped) process needs 181 * to be converted in order for Linux binaries to get a valid signal 182 * number out of it. 183 */ 184 void 185 bsd_to_linux_wstat(st) 186 int *st; 187 { 188 189 int sig; 190 191 if (WIFSIGNALED(*st)) { 192 sig = WTERMSIG(*st); 193 if (sig >= 0 && sig < NSIG) 194 *st= (*st& ~0177) | native_to_linux_signo[sig]; 195 } else if (WIFSTOPPED(*st)) { 196 sig = WSTOPSIG(*st); 197 if (sig >= 0 && sig < NSIG) 198 *st = (*st & ~0xff00) | 199 (native_to_linux_signo[sig] << 8); 200 } 201 } 202 203 /* 204 * wait4(2). Passed on to the NetBSD call, surrounded by code to 205 * reserve some space for a NetBSD-style wait status, and converting 206 * it to what Linux wants. 207 */ 208 int 209 linux_sys_wait4(l, v, retval) 210 struct lwp *l; 211 void *v; 212 register_t *retval; 213 { 214 struct linux_sys_wait4_args /* { 215 syscallarg(int) pid; 216 syscallarg(int *) status; 217 syscallarg(int) options; 218 syscallarg(struct rusage *) rusage; 219 } */ *uap = v; 220 struct proc *p = l->l_proc; 221 struct sys_wait4_args w4a; 222 int error, *status, tstat, options, linux_options; 223 caddr_t sg; 224 225 if (SCARG(uap, status) != NULL) { 226 sg = stackgap_init(p, 0); 227 status = (int *) stackgap_alloc(p, &sg, sizeof *status); 228 } else 229 status = NULL; 230 231 linux_options = SCARG(uap, options); 232 options = 0; 233 if (linux_options & ~(LINUX_WAIT4_KNOWNFLAGS)) 234 return (EINVAL); 235 236 if (linux_options & LINUX_WAIT4_WNOHANG) 237 options |= WNOHANG; 238 if (linux_options & LINUX_WAIT4_WUNTRACED) 239 options |= WUNTRACED; 240 if (linux_options & LINUX_WAIT4_WALL) 241 options |= WALLSIG; 242 if (linux_options & LINUX_WAIT4_WCLONE) 243 options |= WALTSIG; 244 #ifdef DIAGNOSTIC 245 if (linux_options & LINUX_WAIT4_WNOTHREAD) 246 printf("WARNING: %s: linux process %d.%d called " 247 "waitpid with __WNOTHREAD set!", 248 __FILE__, p->p_pid, l->l_lid); 249 250 #endif 251 252 SCARG(&w4a, pid) = SCARG(uap, pid); 253 SCARG(&w4a, status) = status; 254 SCARG(&w4a, options) = options; 255 SCARG(&w4a, rusage) = SCARG(uap, rusage); 256 257 if ((error = sys_wait4(l, &w4a, retval))) 258 return error; 259 260 sigdelset(&p->p_sigctx.ps_siglist, SIGCHLD); 261 262 if (status != NULL) { 263 if ((error = copyin(status, &tstat, sizeof tstat))) 264 return error; 265 266 bsd_to_linux_wstat(&tstat); 267 return copyout(&tstat, SCARG(uap, status), sizeof tstat); 268 } 269 270 return 0; 271 } 272 273 /* 274 * Linux brk(2). The check if the new address is >= the old one is 275 * done in the kernel in Linux. NetBSD does it in the library. 276 */ 277 int 278 linux_sys_brk(l, v, retval) 279 struct lwp *l; 280 void *v; 281 register_t *retval; 282 { 283 struct linux_sys_brk_args /* { 284 syscallarg(char *) nsize; 285 } */ *uap = v; 286 struct proc *p = l->l_proc; 287 char *nbrk = SCARG(uap, nsize); 288 struct sys_obreak_args oba; 289 struct vmspace *vm = p->p_vmspace; 290 struct linux_emuldata *ed = (struct linux_emuldata*)p->p_emuldata; 291 292 SCARG(&oba, nsize) = nbrk; 293 294 if ((caddr_t) nbrk > vm->vm_daddr && sys_obreak(l, &oba, retval) == 0) 295 ed->s->p_break = (char*)nbrk; 296 else 297 nbrk = ed->s->p_break; 298 299 retval[0] = (register_t)nbrk; 300 301 return 0; 302 } 303 304 /* 305 * Convert BSD statfs structure to Linux statfs structure. 306 * The Linux structure has less fields, and it also wants 307 * the length of a name in a dir entry in a field, which 308 * we fake (probably the wrong way). 309 */ 310 static void 311 bsd_to_linux_statfs(bsp, lsp) 312 struct statfs *bsp; 313 struct linux_statfs *lsp; 314 { 315 int i; 316 317 for (i = 0; i < FSTYPESSIZE; i++) 318 if (strcmp(bsp->f_fstypename, fstypes[i].bsd) == 0) 319 break; 320 321 if (i == FSTYPESSIZE) { 322 DPRINTF(("unhandled fstype in linux emulation: %s\n", 323 bsp->f_fstypename)); 324 lsp->l_ftype = LINUX_DEFAULT_SUPER_MAGIC; 325 } else { 326 lsp->l_ftype = fstypes[i].linux; 327 } 328 329 lsp->l_fbsize = bsp->f_bsize; 330 lsp->l_fblocks = bsp->f_blocks; 331 lsp->l_fbfree = bsp->f_bfree; 332 lsp->l_fbavail = bsp->f_bavail; 333 lsp->l_ffiles = bsp->f_files; 334 lsp->l_fffree = bsp->f_ffree; 335 /* Linux sets the fsid to 0..., we don't */ 336 lsp->l_ffsid.val[0] = bsp->f_fsid.val[0]; 337 lsp->l_ffsid.val[1] = bsp->f_fsid.val[1]; 338 lsp->l_fnamelen = MAXNAMLEN; /* XXX */ 339 (void)memset(lsp->l_fspare, 0, sizeof(lsp->l_fspare)); 340 } 341 342 /* 343 * Implement the fs stat functions. Straightforward. 344 */ 345 int 346 linux_sys_statfs(l, v, retval) 347 struct lwp *l; 348 void *v; 349 register_t *retval; 350 { 351 struct linux_sys_statfs_args /* { 352 syscallarg(const char *) path; 353 syscallarg(struct linux_statfs *) sp; 354 } */ *uap = v; 355 struct proc *p = l->l_proc; 356 struct statfs btmp, *bsp; 357 struct linux_statfs ltmp; 358 struct sys_statfs_args bsa; 359 caddr_t sg; 360 int error; 361 362 sg = stackgap_init(p, 0); 363 bsp = (struct statfs *) stackgap_alloc(p, &sg, sizeof (struct statfs)); 364 365 CHECK_ALT_EXIST(p, &sg, SCARG(uap, path)); 366 367 SCARG(&bsa, path) = SCARG(uap, path); 368 SCARG(&bsa, buf) = bsp; 369 370 if ((error = sys_statfs(l, &bsa, retval))) 371 return error; 372 373 if ((error = copyin((caddr_t) bsp, (caddr_t) &btmp, sizeof btmp))) 374 return error; 375 376 bsd_to_linux_statfs(&btmp, <mp); 377 378 return copyout((caddr_t) <mp, (caddr_t) SCARG(uap, sp), sizeof ltmp); 379 } 380 381 int 382 linux_sys_fstatfs(l, v, retval) 383 struct lwp *l; 384 void *v; 385 register_t *retval; 386 { 387 struct linux_sys_fstatfs_args /* { 388 syscallarg(int) fd; 389 syscallarg(struct linux_statfs *) sp; 390 } */ *uap = v; 391 struct proc *p = l->l_proc; 392 struct statfs btmp, *bsp; 393 struct linux_statfs ltmp; 394 struct sys_fstatfs_args bsa; 395 caddr_t sg; 396 int error; 397 398 sg = stackgap_init(p, 0); 399 bsp = (struct statfs *) stackgap_alloc(p, &sg, sizeof (struct statfs)); 400 401 SCARG(&bsa, fd) = SCARG(uap, fd); 402 SCARG(&bsa, buf) = bsp; 403 404 if ((error = sys_fstatfs(l, &bsa, retval))) 405 return error; 406 407 if ((error = copyin((caddr_t) bsp, (caddr_t) &btmp, sizeof btmp))) 408 return error; 409 410 bsd_to_linux_statfs(&btmp, <mp); 411 412 return copyout((caddr_t) <mp, (caddr_t) SCARG(uap, sp), sizeof ltmp); 413 } 414 415 /* 416 * uname(). Just copy the info from the various strings stored in the 417 * kernel, and put it in the Linux utsname structure. That structure 418 * is almost the same as the NetBSD one, only it has fields 65 characters 419 * long, and an extra domainname field. 420 */ 421 int 422 linux_sys_uname(l, v, retval) 423 struct lwp *l; 424 void *v; 425 register_t *retval; 426 { 427 struct linux_sys_uname_args /* { 428 syscallarg(struct linux_utsname *) up; 429 } */ *uap = v; 430 struct linux_utsname luts; 431 432 strncpy(luts.l_sysname, linux_sysname, sizeof(luts.l_sysname)); 433 strncpy(luts.l_nodename, hostname, sizeof(luts.l_nodename)); 434 strncpy(luts.l_release, linux_release, sizeof(luts.l_release)); 435 strncpy(luts.l_version, linux_version, sizeof(luts.l_version)); 436 strncpy(luts.l_machine, machine, sizeof(luts.l_machine)); 437 strncpy(luts.l_domainname, domainname, sizeof(luts.l_domainname)); 438 439 return copyout(&luts, SCARG(uap, up), sizeof(luts)); 440 } 441 442 /* Used directly on: alpha, mips, ppc, sparc, sparc64 */ 443 /* Used indirectly on: arm, i386, m68k */ 444 445 /* 446 * New type Linux mmap call. 447 * Only called directly on machines with >= 6 free regs. 448 */ 449 int 450 linux_sys_mmap(l, v, retval) 451 struct lwp *l; 452 void *v; 453 register_t *retval; 454 { 455 struct linux_sys_mmap_args /* { 456 syscallarg(unsigned long) addr; 457 syscallarg(size_t) len; 458 syscallarg(int) prot; 459 syscallarg(int) flags; 460 syscallarg(int) fd; 461 syscallarg(linux_off_t) offset; 462 } */ *uap = v; 463 464 if (SCARG(uap, offset) & PAGE_MASK) 465 return EINVAL; 466 467 return linux_mmap(l, uap, retval, SCARG(uap, offset)); 468 } 469 470 /* 471 * Guts of most architectures' mmap64() implementations. This shares 472 * its list of arguments with linux_sys_mmap(). 473 * 474 * The difference in linux_sys_mmap2() is that "offset" is actually 475 * (offset / pagesize), not an absolute byte count. This translation 476 * to pagesize offsets is done inside glibc between the mmap64() call 477 * point, and the actual syscall. 478 */ 479 int 480 linux_sys_mmap2(l, v, retval) 481 struct lwp *l; 482 void *v; 483 register_t *retval; 484 { 485 struct linux_sys_mmap2_args /* { 486 syscallarg(unsigned long) addr; 487 syscallarg(size_t) len; 488 syscallarg(int) prot; 489 syscallarg(int) flags; 490 syscallarg(int) fd; 491 syscallarg(linux_off_t) offset; 492 } */ *uap = v; 493 494 return linux_mmap(l, uap, retval, 495 ((off_t)SCARG(uap, offset)) << PAGE_SHIFT); 496 } 497 498 /* 499 * Massage arguments and call system mmap(2). 500 */ 501 static int 502 linux_mmap(l, uap, retval, offset) 503 struct lwp *l; 504 struct linux_sys_mmap_args *uap; 505 register_t *retval; 506 off_t offset; 507 { 508 struct sys_mmap_args cma; 509 int error; 510 size_t mmoff=0; 511 512 if (SCARG(uap, flags) & LINUX_MAP_GROWSDOWN) { 513 /* 514 * Request for stack-like memory segment. On linux, this 515 * works by mmap()ping (small) segment, which is automatically 516 * extended when page fault happens below the currently 517 * allocated area. We emulate this by allocating (typically 518 * bigger) segment sized at current stack size limit, and 519 * offsetting the requested and returned address accordingly. 520 * Since physical pages are only allocated on-demand, this 521 * is effectively identical. 522 */ 523 rlim_t ssl = l->l_proc->p_rlimit[RLIMIT_STACK].rlim_cur; 524 525 if (SCARG(uap, len) < ssl) { 526 /* Compute the address offset */ 527 mmoff = round_page(ssl) - SCARG(uap, len); 528 529 if (SCARG(uap, addr)) 530 SCARG(uap, addr) -= mmoff; 531 532 SCARG(uap, len) = (size_t) ssl; 533 } 534 } 535 536 linux_to_bsd_mmap_args(&cma, uap); 537 SCARG(&cma, pos) = offset; 538 539 error = sys_mmap(l, &cma, retval); 540 if (error) 541 return (error); 542 543 /* Shift the returned address for stack-like segment if necessary */ 544 if (SCARG(uap, flags) & LINUX_MAP_GROWSDOWN && mmoff) 545 retval[0] += mmoff; 546 547 return (0); 548 } 549 550 static void 551 linux_to_bsd_mmap_args(cma, uap) 552 struct sys_mmap_args *cma; 553 const struct linux_sys_mmap_args *uap; 554 { 555 int flags = MAP_TRYFIXED, fl = SCARG(uap, flags); 556 557 flags |= cvtto_bsd_mask(fl, LINUX_MAP_SHARED, MAP_SHARED); 558 flags |= cvtto_bsd_mask(fl, LINUX_MAP_PRIVATE, MAP_PRIVATE); 559 flags |= cvtto_bsd_mask(fl, LINUX_MAP_FIXED, MAP_FIXED); 560 flags |= cvtto_bsd_mask(fl, LINUX_MAP_ANON, MAP_ANON); 561 /* XXX XAX ERH: Any other flags here? There are more defined... */ 562 563 SCARG(cma, addr) = (void *)SCARG(uap, addr); 564 SCARG(cma, len) = SCARG(uap, len); 565 SCARG(cma, prot) = SCARG(uap, prot); 566 if (SCARG(cma, prot) & VM_PROT_WRITE) /* XXX */ 567 SCARG(cma, prot) |= VM_PROT_READ; 568 SCARG(cma, flags) = flags; 569 SCARG(cma, fd) = flags & MAP_ANON ? -1 : SCARG(uap, fd); 570 SCARG(cma, pad) = 0; 571 } 572 573 int 574 linux_sys_mremap(l, v, retval) 575 struct lwp *l; 576 void *v; 577 register_t *retval; 578 { 579 struct linux_sys_mremap_args /* { 580 syscallarg(void *) old_address; 581 syscallarg(size_t) old_size; 582 syscallarg(size_t) new_size; 583 syscallarg(u_long) flags; 584 } */ *uap = v; 585 struct sys_munmap_args mua; 586 size_t old_size, new_size; 587 int error; 588 589 old_size = round_page(SCARG(uap, old_size)); 590 new_size = round_page(SCARG(uap, new_size)); 591 592 /* 593 * Growing mapped region. 594 */ 595 if (new_size > old_size) { 596 /* 597 * XXX Implement me. What we probably want to do is 598 * XXX dig out the guts of the old mapping, mmap that 599 * XXX object again with the new size, then munmap 600 * XXX the old mapping. 601 */ 602 *retval = 0; 603 return (ENOMEM); 604 } 605 606 /* 607 * Shrinking mapped region. 608 */ 609 if (new_size < old_size) { 610 SCARG(&mua, addr) = (caddr_t)SCARG(uap, old_address) + 611 new_size; 612 SCARG(&mua, len) = old_size - new_size; 613 error = sys_munmap(l, &mua, retval); 614 *retval = error ? 0 : (register_t)SCARG(uap, old_address); 615 return (error); 616 } 617 618 /* 619 * No change. 620 */ 621 *retval = (register_t)SCARG(uap, old_address); 622 return (0); 623 } 624 625 int 626 linux_sys_msync(l, v, retval) 627 struct lwp *l; 628 void *v; 629 register_t *retval; 630 { 631 struct linux_sys_msync_args /* { 632 syscallarg(caddr_t) addr; 633 syscallarg(int) len; 634 syscallarg(int) fl; 635 } */ *uap = v; 636 637 struct sys___msync13_args bma; 638 639 /* flags are ignored */ 640 SCARG(&bma, addr) = SCARG(uap, addr); 641 SCARG(&bma, len) = SCARG(uap, len); 642 SCARG(&bma, flags) = SCARG(uap, fl); 643 644 return sys___msync13(l, &bma, retval); 645 } 646 647 int 648 linux_sys_mprotect(l, v, retval) 649 struct lwp *l; 650 void *v; 651 register_t *retval; 652 { 653 struct linux_sys_mprotect_args /* { 654 syscallarg(const void *) start; 655 syscallarg(unsigned long) len; 656 syscallarg(int) prot; 657 } */ *uap = v; 658 unsigned long end, start = (unsigned long)SCARG(uap, start), len; 659 int prot = SCARG(uap, prot); 660 struct vm_map_entry *entry; 661 struct vm_map *map = &l->l_proc->p_vmspace->vm_map; 662 663 if (start & PAGE_MASK) 664 return EINVAL; 665 666 len = round_page(SCARG(uap, len)); 667 end = start + len; 668 669 if (end < start) 670 return EINVAL; 671 else if (end == start) 672 return 0; 673 674 if (SCARG(uap, prot) & ~(PROT_READ | PROT_WRITE | PROT_EXEC)) 675 return EINVAL; 676 677 vm_map_lock(map); 678 #ifdef notdef 679 VM_MAP_RANGE_CHECK(map, start, end); 680 #endif 681 if (!uvm_map_lookup_entry(map, start, &entry) || entry->start > start) { 682 vm_map_unlock(map); 683 return ENOMEM; 684 } 685 vm_map_unlock(map); 686 return uvm_map_protect(map, start, end, prot, FALSE); 687 } 688 689 /* 690 * This code is partly stolen from src/lib/libc/compat-43/times.c 691 */ 692 693 #define CONVTCK(r) (r.tv_sec * hz + r.tv_usec / (1000000 / hz)) 694 695 int 696 linux_sys_times(l, v, retval) 697 struct lwp *l; 698 void *v; 699 register_t *retval; 700 { 701 struct linux_sys_times_args /* { 702 syscallarg(struct times *) tms; 703 } */ *uap = v; 704 struct proc *p = l->l_proc; 705 struct timeval t; 706 int error, s; 707 708 if (SCARG(uap, tms)) { 709 struct linux_tms ltms; 710 struct rusage ru; 711 712 calcru(p, &ru.ru_utime, &ru.ru_stime, NULL); 713 ltms.ltms_utime = CONVTCK(ru.ru_utime); 714 ltms.ltms_stime = CONVTCK(ru.ru_stime); 715 716 ltms.ltms_cutime = CONVTCK(p->p_stats->p_cru.ru_utime); 717 ltms.ltms_cstime = CONVTCK(p->p_stats->p_cru.ru_stime); 718 719 if ((error = copyout(<ms, SCARG(uap, tms), sizeof ltms))) 720 return error; 721 } 722 723 s = splclock(); 724 timersub(&time, &boottime, &t); 725 splx(s); 726 727 retval[0] = ((linux_clock_t)(CONVTCK(t))); 728 return 0; 729 } 730 731 #undef CONVTCK 732 733 /* 734 * Linux 'readdir' call. This code is mostly taken from the 735 * SunOS getdents call (see compat/sunos/sunos_misc.c), though 736 * an attempt has been made to keep it a little cleaner (failing 737 * miserably, because of the cruft needed if count 1 is passed). 738 * 739 * The d_off field should contain the offset of the next valid entry, 740 * but in Linux it has the offset of the entry itself. We emulate 741 * that bug here. 742 * 743 * Read in BSD-style entries, convert them, and copy them out. 744 * 745 * Note that this doesn't handle union-mounted filesystems. 746 */ 747 int 748 linux_sys_getdents(l, v, retval) 749 struct lwp *l; 750 void *v; 751 register_t *retval; 752 { 753 struct linux_sys_getdents_args /* { 754 syscallarg(int) fd; 755 syscallarg(struct linux_dirent *) dent; 756 syscallarg(unsigned int) count; 757 } */ *uap = v; 758 struct proc *p = l->l_proc; 759 struct dirent *bdp; 760 struct vnode *vp; 761 caddr_t inp, buf; /* BSD-format */ 762 int len, reclen; /* BSD-format */ 763 caddr_t outp; /* Linux-format */ 764 int resid, linux_reclen = 0; /* Linux-format */ 765 struct file *fp; 766 struct uio auio; 767 struct iovec aiov; 768 struct linux_dirent idb; 769 off_t off; /* true file offset */ 770 int buflen, error, eofflag, nbytes, oldcall; 771 struct vattr va; 772 off_t *cookiebuf = NULL, *cookie; 773 int ncookies; 774 775 /* getvnode() will use the descriptor for us */ 776 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 777 return (error); 778 779 if ((fp->f_flag & FREAD) == 0) { 780 error = EBADF; 781 goto out1; 782 } 783 784 vp = (struct vnode *)fp->f_data; 785 if (vp->v_type != VDIR) { 786 error = EINVAL; 787 goto out1; 788 } 789 790 if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p))) 791 goto out1; 792 793 nbytes = SCARG(uap, count); 794 if (nbytes == 1) { /* emulating old, broken behaviour */ 795 nbytes = sizeof (idb); 796 buflen = max(va.va_blocksize, nbytes); 797 oldcall = 1; 798 } else { 799 buflen = min(MAXBSIZE, nbytes); 800 if (buflen < va.va_blocksize) 801 buflen = va.va_blocksize; 802 oldcall = 0; 803 } 804 buf = malloc(buflen, M_TEMP, M_WAITOK); 805 806 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 807 off = fp->f_offset; 808 again: 809 aiov.iov_base = buf; 810 aiov.iov_len = buflen; 811 auio.uio_iov = &aiov; 812 auio.uio_iovcnt = 1; 813 auio.uio_rw = UIO_READ; 814 auio.uio_segflg = UIO_SYSSPACE; 815 auio.uio_procp = p; 816 auio.uio_resid = buflen; 817 auio.uio_offset = off; 818 /* 819 * First we read into the malloc'ed buffer, then 820 * we massage it into user space, one record at a time. 821 */ 822 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, &cookiebuf, 823 &ncookies); 824 if (error) 825 goto out; 826 827 inp = buf; 828 outp = (caddr_t)SCARG(uap, dent); 829 resid = nbytes; 830 if ((len = buflen - auio.uio_resid) == 0) 831 goto eof; 832 833 for (cookie = cookiebuf; len > 0; len -= reclen) { 834 bdp = (struct dirent *)inp; 835 reclen = bdp->d_reclen; 836 if (reclen & 3) 837 panic("linux_readdir"); 838 if (bdp->d_fileno == 0) { 839 inp += reclen; /* it is a hole; squish it out */ 840 off = *cookie++; 841 continue; 842 } 843 linux_reclen = LINUX_RECLEN(&idb, bdp->d_namlen); 844 if (reclen > len || resid < linux_reclen) { 845 /* entry too big for buffer, so just stop */ 846 outp++; 847 break; 848 } 849 /* 850 * Massage in place to make a Linux-shaped dirent (otherwise 851 * we have to worry about touching user memory outside of 852 * the copyout() call). 853 */ 854 idb.d_ino = bdp->d_fileno; 855 /* 856 * The old readdir() call misuses the offset and reclen fields. 857 */ 858 if (oldcall) { 859 idb.d_off = (linux_off_t)linux_reclen; 860 idb.d_reclen = (u_short)bdp->d_namlen; 861 } else { 862 if (sizeof (idb.d_off) <= 4 && (off >> 32) != 0) { 863 compat_offseterr(vp, "linux_getdents"); 864 error = EINVAL; 865 goto out; 866 } 867 idb.d_off = (linux_off_t)off; 868 idb.d_reclen = (u_short)linux_reclen; 869 } 870 strcpy(idb.d_name, bdp->d_name); 871 if ((error = copyout((caddr_t)&idb, outp, linux_reclen))) 872 goto out; 873 /* advance past this real entry */ 874 inp += reclen; 875 off = *cookie++; /* each entry points to itself */ 876 /* advance output past Linux-shaped entry */ 877 outp += linux_reclen; 878 resid -= linux_reclen; 879 if (oldcall) 880 break; 881 } 882 883 /* if we squished out the whole block, try again */ 884 if (outp == (caddr_t)SCARG(uap, dent)) 885 goto again; 886 fp->f_offset = off; /* update the vnode offset */ 887 888 if (oldcall) 889 nbytes = resid + linux_reclen; 890 891 eof: 892 *retval = nbytes - resid; 893 out: 894 VOP_UNLOCK(vp, 0); 895 if (cookiebuf) 896 free(cookiebuf, M_TEMP); 897 free(buf, M_TEMP); 898 out1: 899 FILE_UNUSE(fp, p); 900 return error; 901 } 902 903 /* 904 * Even when just using registers to pass arguments to syscalls you can 905 * have 5 of them on the i386. So this newer version of select() does 906 * this. 907 */ 908 int 909 linux_sys_select(l, v, retval) 910 struct lwp *l; 911 void *v; 912 register_t *retval; 913 { 914 struct linux_sys_select_args /* { 915 syscallarg(int) nfds; 916 syscallarg(fd_set *) readfds; 917 syscallarg(fd_set *) writefds; 918 syscallarg(fd_set *) exceptfds; 919 syscallarg(struct timeval *) timeout; 920 } */ *uap = v; 921 922 return linux_select1(l, retval, SCARG(uap, nfds), SCARG(uap, readfds), 923 SCARG(uap, writefds), SCARG(uap, exceptfds), SCARG(uap, timeout)); 924 } 925 926 /* 927 * Common code for the old and new versions of select(). A couple of 928 * things are important: 929 * 1) return the amount of time left in the 'timeout' parameter 930 * 2) select never returns ERESTART on Linux, always return EINTR 931 */ 932 int 933 linux_select1(l, retval, nfds, readfds, writefds, exceptfds, timeout) 934 struct lwp *l; 935 register_t *retval; 936 int nfds; 937 fd_set *readfds, *writefds, *exceptfds; 938 struct timeval *timeout; 939 { 940 struct sys_select_args bsa; 941 struct proc *p = l->l_proc; 942 struct timeval tv0, tv1, utv, *tvp; 943 caddr_t sg; 944 int error; 945 946 SCARG(&bsa, nd) = nfds; 947 SCARG(&bsa, in) = readfds; 948 SCARG(&bsa, ou) = writefds; 949 SCARG(&bsa, ex) = exceptfds; 950 SCARG(&bsa, tv) = timeout; 951 952 /* 953 * Store current time for computation of the amount of 954 * time left. 955 */ 956 if (timeout) { 957 if ((error = copyin(timeout, &utv, sizeof(utv)))) 958 return error; 959 if (itimerfix(&utv)) { 960 /* 961 * The timeval was invalid. Convert it to something 962 * valid that will act as it does under Linux. 963 */ 964 sg = stackgap_init(p, 0); 965 tvp = stackgap_alloc(p, &sg, sizeof(utv)); 966 utv.tv_sec += utv.tv_usec / 1000000; 967 utv.tv_usec %= 1000000; 968 if (utv.tv_usec < 0) { 969 utv.tv_sec -= 1; 970 utv.tv_usec += 1000000; 971 } 972 if (utv.tv_sec < 0) 973 timerclear(&utv); 974 if ((error = copyout(&utv, tvp, sizeof(utv)))) 975 return error; 976 SCARG(&bsa, tv) = tvp; 977 } 978 microtime(&tv0); 979 } 980 981 error = sys_select(l, &bsa, retval); 982 if (error) { 983 /* 984 * See fs/select.c in the Linux kernel. Without this, 985 * Maelstrom doesn't work. 986 */ 987 if (error == ERESTART) 988 error = EINTR; 989 return error; 990 } 991 992 if (timeout) { 993 if (*retval) { 994 /* 995 * Compute how much time was left of the timeout, 996 * by subtracting the current time and the time 997 * before we started the call, and subtracting 998 * that result from the user-supplied value. 999 */ 1000 microtime(&tv1); 1001 timersub(&tv1, &tv0, &tv1); 1002 timersub(&utv, &tv1, &utv); 1003 if (utv.tv_sec < 0) 1004 timerclear(&utv); 1005 } else 1006 timerclear(&utv); 1007 if ((error = copyout(&utv, timeout, sizeof(utv)))) 1008 return error; 1009 } 1010 1011 return 0; 1012 } 1013 1014 /* 1015 * Get the process group of a certain process. Look it up 1016 * and return the value. 1017 */ 1018 int 1019 linux_sys_getpgid(l, v, retval) 1020 struct lwp *l; 1021 void *v; 1022 register_t *retval; 1023 { 1024 struct linux_sys_getpgid_args /* { 1025 syscallarg(int) pid; 1026 } */ *uap = v; 1027 struct proc *p = l->l_proc; 1028 struct proc *targp; 1029 1030 if (SCARG(uap, pid) != 0 && SCARG(uap, pid) != p->p_pid) { 1031 if ((targp = pfind(SCARG(uap, pid))) == 0) 1032 return ESRCH; 1033 } 1034 else 1035 targp = p; 1036 1037 retval[0] = targp->p_pgid; 1038 return 0; 1039 } 1040 1041 /* 1042 * Set the 'personality' (emulation mode) for the current process. Only 1043 * accept the Linux personality here (0). This call is needed because 1044 * the Linux ELF crt0 issues it in an ugly kludge to make sure that 1045 * ELF binaries run in Linux mode, not SVR4 mode. 1046 */ 1047 int 1048 linux_sys_personality(l, v, retval) 1049 struct lwp *l; 1050 void *v; 1051 register_t *retval; 1052 { 1053 struct linux_sys_personality_args /* { 1054 syscallarg(int) per; 1055 } */ *uap = v; 1056 1057 if (SCARG(uap, per) != 0) 1058 return EINVAL; 1059 retval[0] = 0; 1060 return 0; 1061 } 1062 1063 #if defined(__i386__) || defined(__m68k__) 1064 /* 1065 * The calls are here because of type conversions. 1066 */ 1067 int 1068 linux_sys_setreuid16(l, v, retval) 1069 struct lwp *l; 1070 void *v; 1071 register_t *retval; 1072 { 1073 struct linux_sys_setreuid16_args /* { 1074 syscallarg(int) ruid; 1075 syscallarg(int) euid; 1076 } */ *uap = v; 1077 struct sys_setreuid_args bsa; 1078 1079 SCARG(&bsa, ruid) = ((linux_uid_t)SCARG(uap, ruid) == (linux_uid_t)-1) ? 1080 (uid_t)-1 : SCARG(uap, ruid); 1081 SCARG(&bsa, euid) = ((linux_uid_t)SCARG(uap, euid) == (linux_uid_t)-1) ? 1082 (uid_t)-1 : SCARG(uap, euid); 1083 1084 return sys_setreuid(l, &bsa, retval); 1085 } 1086 1087 int 1088 linux_sys_setregid16(l, v, retval) 1089 struct lwp *l; 1090 void *v; 1091 register_t *retval; 1092 { 1093 struct linux_sys_setregid16_args /* { 1094 syscallarg(int) rgid; 1095 syscallarg(int) egid; 1096 } */ *uap = v; 1097 struct sys_setregid_args bsa; 1098 1099 SCARG(&bsa, rgid) = ((linux_gid_t)SCARG(uap, rgid) == (linux_gid_t)-1) ? 1100 (uid_t)-1 : SCARG(uap, rgid); 1101 SCARG(&bsa, egid) = ((linux_gid_t)SCARG(uap, egid) == (linux_gid_t)-1) ? 1102 (uid_t)-1 : SCARG(uap, egid); 1103 1104 return sys_setregid(l, &bsa, retval); 1105 } 1106 1107 int 1108 linux_sys_setresuid16(l, v, retval) 1109 struct lwp *l; 1110 void *v; 1111 register_t *retval; 1112 { 1113 struct linux_sys_setresuid16_args /* { 1114 syscallarg(uid_t) ruid; 1115 syscallarg(uid_t) euid; 1116 syscallarg(uid_t) suid; 1117 } */ *uap = v; 1118 struct linux_sys_setresuid16_args lsa; 1119 1120 SCARG(&lsa, ruid) = ((linux_uid_t)SCARG(uap, ruid) == (linux_uid_t)-1) ? 1121 (uid_t)-1 : SCARG(uap, ruid); 1122 SCARG(&lsa, euid) = ((linux_uid_t)SCARG(uap, euid) == (linux_uid_t)-1) ? 1123 (uid_t)-1 : SCARG(uap, euid); 1124 SCARG(&lsa, suid) = ((linux_uid_t)SCARG(uap, suid) == (linux_uid_t)-1) ? 1125 (uid_t)-1 : SCARG(uap, suid); 1126 1127 return linux_sys_setresuid(l, &lsa, retval); 1128 } 1129 1130 int 1131 linux_sys_setresgid16(l, v, retval) 1132 struct lwp *l; 1133 void *v; 1134 register_t *retval; 1135 { 1136 struct linux_sys_setresgid16_args /* { 1137 syscallarg(gid_t) rgid; 1138 syscallarg(gid_t) egid; 1139 syscallarg(gid_t) sgid; 1140 } */ *uap = v; 1141 struct linux_sys_setresgid16_args lsa; 1142 1143 SCARG(&lsa, rgid) = ((linux_gid_t)SCARG(uap, rgid) == (linux_gid_t)-1) ? 1144 (gid_t)-1 : SCARG(uap, rgid); 1145 SCARG(&lsa, egid) = ((linux_gid_t)SCARG(uap, egid) == (linux_gid_t)-1) ? 1146 (gid_t)-1 : SCARG(uap, egid); 1147 SCARG(&lsa, sgid) = ((linux_gid_t)SCARG(uap, sgid) == (linux_gid_t)-1) ? 1148 (gid_t)-1 : SCARG(uap, sgid); 1149 1150 return linux_sys_setresgid(l, &lsa, retval); 1151 } 1152 1153 int 1154 linux_sys_getgroups16(l, v, retval) 1155 struct lwp *l; 1156 void *v; 1157 register_t *retval; 1158 { 1159 struct linux_sys_getgroups16_args /* { 1160 syscallarg(int) gidsetsize; 1161 syscallarg(linux_gid_t *) gidset; 1162 } */ *uap = v; 1163 struct proc *p = l->l_proc; 1164 caddr_t sg; 1165 int n, error, i; 1166 struct sys_getgroups_args bsa; 1167 gid_t *bset, *kbset; 1168 linux_gid_t *lset; 1169 struct pcred *pc = p->p_cred; 1170 1171 n = SCARG(uap, gidsetsize); 1172 if (n < 0) 1173 return EINVAL; 1174 error = 0; 1175 bset = kbset = NULL; 1176 lset = NULL; 1177 if (n > 0) { 1178 n = min(pc->pc_ucred->cr_ngroups, n); 1179 sg = stackgap_init(p, 0); 1180 bset = stackgap_alloc(p, &sg, n * sizeof (gid_t)); 1181 kbset = malloc(n * sizeof (gid_t), M_TEMP, M_WAITOK); 1182 lset = malloc(n * sizeof (linux_gid_t), M_TEMP, M_WAITOK); 1183 if (bset == NULL || kbset == NULL || lset == NULL) 1184 return ENOMEM; 1185 SCARG(&bsa, gidsetsize) = n; 1186 SCARG(&bsa, gidset) = bset; 1187 error = sys_getgroups(l, &bsa, retval); 1188 if (error != 0) 1189 goto out; 1190 error = copyin(bset, kbset, n * sizeof (gid_t)); 1191 if (error != 0) 1192 goto out; 1193 for (i = 0; i < n; i++) 1194 lset[i] = (linux_gid_t)kbset[i]; 1195 error = copyout(lset, SCARG(uap, gidset), 1196 n * sizeof (linux_gid_t)); 1197 } else 1198 *retval = pc->pc_ucred->cr_ngroups; 1199 out: 1200 if (kbset != NULL) 1201 free(kbset, M_TEMP); 1202 if (lset != NULL) 1203 free(lset, M_TEMP); 1204 return error; 1205 } 1206 1207 int 1208 linux_sys_setgroups16(l, v, retval) 1209 struct lwp *l; 1210 void *v; 1211 register_t *retval; 1212 { 1213 struct linux_sys_setgroups16_args /* { 1214 syscallarg(int) gidsetsize; 1215 syscallarg(linux_gid_t *) gidset; 1216 } */ *uap = v; 1217 struct proc *p = l->l_proc; 1218 caddr_t sg; 1219 int n; 1220 int error, i; 1221 struct sys_setgroups_args bsa; 1222 gid_t *bset, *kbset; 1223 linux_gid_t *lset; 1224 1225 n = SCARG(uap, gidsetsize); 1226 if (n < 0 || n > NGROUPS) 1227 return EINVAL; 1228 sg = stackgap_init(p, 0); 1229 bset = stackgap_alloc(p, &sg, n * sizeof (gid_t)); 1230 lset = malloc(n * sizeof (linux_gid_t), M_TEMP, M_WAITOK); 1231 kbset = malloc(n * sizeof (gid_t), M_TEMP, M_WAITOK); 1232 if (lset == NULL || bset == NULL) 1233 return ENOMEM; 1234 error = copyin(SCARG(uap, gidset), lset, n * sizeof (linux_gid_t)); 1235 if (error != 0) 1236 goto out; 1237 for (i = 0; i < n; i++) 1238 kbset[i] = (gid_t)lset[i]; 1239 error = copyout(kbset, bset, n * sizeof (gid_t)); 1240 if (error != 0) 1241 goto out; 1242 SCARG(&bsa, gidsetsize) = n; 1243 SCARG(&bsa, gidset) = bset; 1244 error = sys_setgroups(l, &bsa, retval); 1245 1246 out: 1247 if (lset != NULL) 1248 free(lset, M_TEMP); 1249 if (kbset != NULL) 1250 free(kbset, M_TEMP); 1251 1252 return error; 1253 } 1254 1255 #endif /* __i386__ || __m68k__ */ 1256 1257 /* 1258 * We have nonexistent fsuid equal to uid. 1259 * If modification is requested, refuse. 1260 */ 1261 int 1262 linux_sys_setfsuid(l, v, retval) 1263 struct lwp *l; 1264 void *v; 1265 register_t *retval; 1266 { 1267 struct linux_sys_setfsuid_args /* { 1268 syscallarg(uid_t) uid; 1269 } */ *uap = v; 1270 struct proc *p = l->l_proc; 1271 uid_t uid; 1272 1273 uid = SCARG(uap, uid); 1274 if (p->p_cred->p_ruid != uid) 1275 return sys_nosys(l, v, retval); 1276 else 1277 return (0); 1278 } 1279 1280 /* XXX XXX XXX */ 1281 #ifndef alpha 1282 int 1283 linux_sys_getfsuid(l, v, retval) 1284 struct lwp *l; 1285 void *v; 1286 register_t *retval; 1287 { 1288 return sys_getuid(l, v, retval); 1289 } 1290 #endif 1291 1292 int 1293 linux_sys_setresuid(l, v, retval) 1294 struct lwp *l; 1295 void *v; 1296 register_t *retval; 1297 { 1298 struct linux_sys_setresuid_args /* { 1299 syscallarg(uid_t) ruid; 1300 syscallarg(uid_t) euid; 1301 syscallarg(uid_t) suid; 1302 } */ *uap = v; 1303 1304 /* 1305 * Note: These checks are a little different than the NetBSD 1306 * setreuid(2) call performs. This precisely follows the 1307 * behavior of the Linux kernel. 1308 */ 1309 1310 return do_setresuid(l, SCARG(uap, ruid), SCARG(uap, euid), 1311 SCARG(uap, suid), 1312 ID_R_EQ_R | ID_R_EQ_E | ID_R_EQ_S | 1313 ID_E_EQ_R | ID_E_EQ_E | ID_E_EQ_S | 1314 ID_S_EQ_R | ID_S_EQ_E | ID_S_EQ_S ); 1315 } 1316 1317 int 1318 linux_sys_getresuid(l, v, retval) 1319 struct lwp *l; 1320 void *v; 1321 register_t *retval; 1322 { 1323 struct linux_sys_getresuid_args /* { 1324 syscallarg(uid_t *) ruid; 1325 syscallarg(uid_t *) euid; 1326 syscallarg(uid_t *) suid; 1327 } */ *uap = v; 1328 struct proc *p = l->l_proc; 1329 struct pcred *pc = p->p_cred; 1330 int error; 1331 1332 /* 1333 * Linux copies these values out to userspace like so: 1334 * 1335 * 1. Copy out ruid. 1336 * 2. If that succeeds, copy out euid. 1337 * 3. If both of those succeed, copy out suid. 1338 */ 1339 if ((error = copyout(&pc->p_ruid, SCARG(uap, ruid), 1340 sizeof(uid_t))) != 0) 1341 return (error); 1342 1343 if ((error = copyout(&pc->pc_ucred->cr_uid, SCARG(uap, euid), 1344 sizeof(uid_t))) != 0) 1345 return (error); 1346 1347 return (copyout(&pc->p_svuid, SCARG(uap, suid), sizeof(uid_t))); 1348 } 1349 1350 int 1351 linux_sys_ptrace(l, v, retval) 1352 struct lwp *l; 1353 void *v; 1354 register_t *retval; 1355 { 1356 struct linux_sys_ptrace_args /* { 1357 i386, m68k, powerpc: T=int 1358 alpha: T=long 1359 syscallarg(T) request; 1360 syscallarg(T) pid; 1361 syscallarg(T) addr; 1362 syscallarg(T) data; 1363 } */ *uap = v; 1364 const int *ptr; 1365 int request; 1366 int error; 1367 1368 ptr = linux_ptrace_request_map; 1369 request = SCARG(uap, request); 1370 while (*ptr != -1) 1371 if (*ptr++ == request) { 1372 struct sys_ptrace_args pta; 1373 1374 SCARG(&pta, req) = *ptr; 1375 SCARG(&pta, pid) = SCARG(uap, pid); 1376 SCARG(&pta, addr) = (caddr_t)SCARG(uap, addr); 1377 SCARG(&pta, data) = SCARG(uap, data); 1378 1379 /* 1380 * Linux ptrace(PTRACE_CONT, pid, 0, 0) means actually 1381 * to continue where the process left off previously. 1382 * The same thing is achieved by addr == (caddr_t) 1 1383 * on NetBSD, so rewrite 'addr' appropriately. 1384 */ 1385 if (request == LINUX_PTRACE_CONT && SCARG(uap, addr)==0) 1386 SCARG(&pta, addr) = (caddr_t) 1; 1387 1388 error = sys_ptrace(l, &pta, retval); 1389 if (error) 1390 return error; 1391 switch (request) { 1392 case LINUX_PTRACE_PEEKTEXT: 1393 case LINUX_PTRACE_PEEKDATA: 1394 error = copyout (retval, 1395 (caddr_t)SCARG(uap, data), sizeof *retval); 1396 *retval = SCARG(uap, data); 1397 break; 1398 default: 1399 break; 1400 } 1401 return error; 1402 } 1403 else 1404 ptr++; 1405 1406 return LINUX_SYS_PTRACE_ARCH(l, uap, retval); 1407 } 1408 1409 int 1410 linux_sys_reboot(struct lwp *l, void *v, register_t *retval) 1411 { 1412 struct linux_sys_reboot_args /* { 1413 syscallarg(int) magic1; 1414 syscallarg(int) magic2; 1415 syscallarg(int) cmd; 1416 syscallarg(void *) arg; 1417 } */ *uap = v; 1418 struct sys_reboot_args /* { 1419 syscallarg(int) opt; 1420 syscallarg(char *) bootstr; 1421 } */ sra; 1422 struct proc *p = l->l_proc; 1423 int error; 1424 1425 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) 1426 return(error); 1427 1428 if (SCARG(uap, magic1) != LINUX_REBOOT_MAGIC1) 1429 return(EINVAL); 1430 if (SCARG(uap, magic2) != LINUX_REBOOT_MAGIC2 && 1431 SCARG(uap, magic2) != LINUX_REBOOT_MAGIC2A && 1432 SCARG(uap, magic2) != LINUX_REBOOT_MAGIC2B) 1433 return(EINVAL); 1434 1435 switch (SCARG(uap, cmd)) { 1436 case LINUX_REBOOT_CMD_RESTART: 1437 SCARG(&sra, opt) = RB_AUTOBOOT; 1438 break; 1439 case LINUX_REBOOT_CMD_HALT: 1440 SCARG(&sra, opt) = RB_HALT; 1441 break; 1442 case LINUX_REBOOT_CMD_POWER_OFF: 1443 SCARG(&sra, opt) = RB_HALT|RB_POWERDOWN; 1444 break; 1445 case LINUX_REBOOT_CMD_RESTART2: 1446 /* Reboot with an argument. */ 1447 SCARG(&sra, opt) = RB_AUTOBOOT|RB_STRING; 1448 SCARG(&sra, bootstr) = SCARG(uap, arg); 1449 break; 1450 case LINUX_REBOOT_CMD_CAD_ON: 1451 return(EINVAL); /* We don't implement ctrl-alt-delete */ 1452 case LINUX_REBOOT_CMD_CAD_OFF: 1453 return(0); 1454 default: 1455 return(EINVAL); 1456 } 1457 1458 return(sys_reboot(l, &sra, retval)); 1459 } 1460 1461 /* 1462 * Copy of compat_12_sys_swapon(). 1463 */ 1464 int 1465 linux_sys_swapon(l, v, retval) 1466 struct lwp *l; 1467 void *v; 1468 register_t *retval; 1469 { 1470 struct sys_swapctl_args ua; 1471 struct linux_sys_swapon_args /* { 1472 syscallarg(const char *) name; 1473 } */ *uap = v; 1474 1475 SCARG(&ua, cmd) = SWAP_ON; 1476 SCARG(&ua, arg) = (void *)SCARG(uap, name); 1477 SCARG(&ua, misc) = 0; /* priority */ 1478 return (sys_swapctl(l, &ua, retval)); 1479 } 1480 1481 /* 1482 * Stop swapping to the file or block device specified by path. 1483 */ 1484 int 1485 linux_sys_swapoff(l, v, retval) 1486 struct lwp *l; 1487 void *v; 1488 register_t *retval; 1489 { 1490 struct sys_swapctl_args ua; 1491 struct linux_sys_swapoff_args /* { 1492 syscallarg(const char *) path; 1493 } */ *uap = v; 1494 1495 SCARG(&ua, cmd) = SWAP_OFF; 1496 SCARG(&ua, arg) = (void *)SCARG(uap, path); 1497 return (sys_swapctl(l, &ua, retval)); 1498 } 1499 1500 /* 1501 * Copy of compat_09_sys_setdomainname() 1502 */ 1503 /* ARGSUSED */ 1504 int 1505 linux_sys_setdomainname(l, v, retval) 1506 struct lwp *l; 1507 void *v; 1508 register_t *retval; 1509 { 1510 struct linux_sys_setdomainname_args /* { 1511 syscallarg(char *) domainname; 1512 syscallarg(int) len; 1513 } */ *uap = v; 1514 int name[2]; 1515 1516 name[0] = CTL_KERN; 1517 name[1] = KERN_DOMAINNAME; 1518 return (old_sysctl(&name[0], 2, 0, 0, SCARG(uap, domainname), 1519 SCARG(uap, len), l)); 1520 } 1521 1522 /* 1523 * sysinfo() 1524 */ 1525 /* ARGSUSED */ 1526 int 1527 linux_sys_sysinfo(l, v, retval) 1528 struct lwp *l; 1529 void *v; 1530 register_t *retval; 1531 { 1532 struct linux_sys_sysinfo_args /* { 1533 syscallarg(struct linux_sysinfo *) arg; 1534 } */ *uap = v; 1535 struct linux_sysinfo si; 1536 struct loadavg *la; 1537 1538 si.uptime = time.tv_sec - boottime.tv_sec; 1539 la = &averunnable; 1540 si.loads[0] = la->ldavg[0] * LINUX_SYSINFO_LOADS_SCALE / la->fscale; 1541 si.loads[1] = la->ldavg[1] * LINUX_SYSINFO_LOADS_SCALE / la->fscale; 1542 si.loads[2] = la->ldavg[2] * LINUX_SYSINFO_LOADS_SCALE / la->fscale; 1543 si.totalram = ctob(physmem); 1544 si.freeram = uvmexp.free * uvmexp.pagesize; 1545 si.sharedram = 0; /* XXX */ 1546 si.bufferram = uvmexp.filepages * uvmexp.pagesize; 1547 si.totalswap = uvmexp.swpages * uvmexp.pagesize; 1548 si.freeswap = (uvmexp.swpages - uvmexp.swpginuse) * uvmexp.pagesize; 1549 si.procs = nprocs; 1550 1551 /* The following are only present in newer Linux kernels. */ 1552 si.totalbig = 0; 1553 si.freebig = 0; 1554 si.mem_unit = 1; 1555 1556 return (copyout(&si, SCARG(uap, arg), sizeof si)); 1557 } 1558 1559 #define bsd_to_linux_rlimit1(l, b, f) \ 1560 (l)->f = ((b)->f == RLIM_INFINITY || \ 1561 ((b)->f & 0xffffffff00000000ULL) != 0) ? \ 1562 LINUX_RLIM_INFINITY : (int32_t)(b)->f 1563 #define bsd_to_linux_rlimit(l, b) \ 1564 bsd_to_linux_rlimit1(l, b, rlim_cur); \ 1565 bsd_to_linux_rlimit1(l, b, rlim_max) 1566 1567 #define linux_to_bsd_rlimit1(b, l, f) \ 1568 (b)->f = (l)->f == LINUX_RLIM_INFINITY ? RLIM_INFINITY : (l)->f 1569 #define linux_to_bsd_rlimit(b, l) \ 1570 linux_to_bsd_rlimit1(b, l, rlim_cur); \ 1571 linux_to_bsd_rlimit1(b, l, rlim_max) 1572 1573 static int 1574 linux_to_bsd_limit(lim) 1575 int lim; 1576 { 1577 switch (lim) { 1578 case LINUX_RLIMIT_CPU: 1579 return RLIMIT_CPU; 1580 case LINUX_RLIMIT_FSIZE: 1581 return RLIMIT_FSIZE; 1582 case LINUX_RLIMIT_DATA: 1583 return RLIMIT_DATA; 1584 case LINUX_RLIMIT_STACK: 1585 return RLIMIT_STACK; 1586 case LINUX_RLIMIT_CORE: 1587 return RLIMIT_CORE; 1588 case LINUX_RLIMIT_RSS: 1589 return RLIMIT_RSS; 1590 case LINUX_RLIMIT_NPROC: 1591 return RLIMIT_NPROC; 1592 case LINUX_RLIMIT_NOFILE: 1593 return RLIMIT_NOFILE; 1594 case LINUX_RLIMIT_MEMLOCK: 1595 return RLIMIT_MEMLOCK; 1596 case LINUX_RLIMIT_AS: 1597 case LINUX_RLIMIT_LOCKS: 1598 return -EOPNOTSUPP; 1599 default: 1600 return -EINVAL; 1601 } 1602 } 1603 1604 1605 int 1606 linux_sys_getrlimit(l, v, retval) 1607 struct lwp *l; 1608 void *v; 1609 register_t *retval; 1610 { 1611 struct linux_sys_getrlimit_args /* { 1612 syscallarg(int) which; 1613 syscallarg(struct orlimit *) rlp; 1614 } */ *uap = v; 1615 struct proc *p = l->l_proc; 1616 caddr_t sg = stackgap_init(p, 0); 1617 struct sys_getrlimit_args ap; 1618 struct rlimit rl; 1619 struct orlimit orl; 1620 int error; 1621 1622 SCARG(&ap, which) = linux_to_bsd_limit(SCARG(uap, which)); 1623 if ((error = SCARG(&ap, which)) < 0) 1624 return -error; 1625 SCARG(&ap, rlp) = stackgap_alloc(p, &sg, sizeof rl); 1626 if ((error = sys_getrlimit(l, &ap, retval)) != 0) 1627 return error; 1628 if ((error = copyin(SCARG(&ap, rlp), &rl, sizeof(rl))) != 0) 1629 return error; 1630 bsd_to_linux_rlimit(&orl, &rl); 1631 return copyout(&orl, SCARG(uap, rlp), sizeof(orl)); 1632 } 1633 1634 int 1635 linux_sys_setrlimit(l, v, retval) 1636 struct lwp *l; 1637 void *v; 1638 register_t *retval; 1639 { 1640 struct linux_sys_setrlimit_args /* { 1641 syscallarg(int) which; 1642 syscallarg(struct orlimit *) rlp; 1643 } */ *uap = v; 1644 struct proc *p = l->l_proc; 1645 caddr_t sg = stackgap_init(p, 0); 1646 struct sys_setrlimit_args ap; 1647 struct rlimit rl; 1648 struct orlimit orl; 1649 int error; 1650 1651 SCARG(&ap, which) = linux_to_bsd_limit(SCARG(uap, which)); 1652 SCARG(&ap, rlp) = stackgap_alloc(p, &sg, sizeof rl); 1653 if ((error = SCARG(&ap, which)) < 0) 1654 return -error; 1655 if ((error = copyin(SCARG(uap, rlp), &orl, sizeof(orl))) != 0) 1656 return error; 1657 linux_to_bsd_rlimit(&rl, &orl); 1658 /* XXX: alpha complains about this */ 1659 if ((error = copyout(&rl, (void *)SCARG(&ap, rlp), sizeof(rl))) != 0) 1660 return error; 1661 return sys_setrlimit(l, &ap, retval); 1662 } 1663 1664 #ifndef __mips__ 1665 /* XXX: this doesn't look 100% common, at least mips doesn't have it */ 1666 int 1667 linux_sys_ugetrlimit(l, v, retval) 1668 struct lwp *l; 1669 void *v; 1670 register_t *retval; 1671 { 1672 return linux_sys_getrlimit(l, v, retval); 1673 } 1674 #endif 1675 1676 /* 1677 * This gets called for unsupported syscalls. The difference to sys_nosys() 1678 * is that process does not get SIGSYS, the call just returns with ENOSYS. 1679 * This is the way Linux does it and glibc depends on this behaviour. 1680 */ 1681 int 1682 linux_sys_nosys(l, v, retval) 1683 struct lwp *l; 1684 void *v; 1685 register_t *retval; 1686 { 1687 return (ENOSYS); 1688 }
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