1 /* $NetBSD: linux_misc.c,v 1.238 2017/05/06 21:34:51 joerg Exp $ */ 2 3 /*- 4 * Copyright (c) 1995, 1998, 1999, 2008 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 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 /* 34 * Linux compatibility module. Try to deal with various Linux system calls. 35 */ 36 37 /* 38 * These functions have been moved to multiarch to allow 39 * selection of which machines include them to be 40 * determined by the individual files.linux_<arch> files. 41 * 42 * Function in multiarch: 43 * linux_sys_break : linux_break.c 44 * linux_sys_alarm : linux_misc_notalpha.c 45 * linux_sys_getresgid : linux_misc_notalpha.c 46 * linux_sys_nice : linux_misc_notalpha.c 47 * linux_sys_readdir : linux_misc_notalpha.c 48 * linux_sys_setresgid : linux_misc_notalpha.c 49 * linux_sys_time : linux_misc_notalpha.c 50 * linux_sys_utime : linux_misc_notalpha.c 51 * linux_sys_waitpid : linux_misc_notalpha.c 52 * linux_sys_old_mmap : linux_oldmmap.c 53 * linux_sys_oldolduname : linux_oldolduname.c 54 * linux_sys_oldselect : linux_oldselect.c 55 * linux_sys_olduname : linux_olduname.c 56 * linux_sys_pipe : linux_pipe.c 57 */ 58 59 #include <sys/cdefs.h> 60 __KERNEL_RCSID(0, "$NetBSD: linux_misc.c,v 1.238 2017/05/06 21:34:51 joerg Exp $"); 61 62 #include <sys/param.h> 63 #include <sys/systm.h> 64 #include <sys/namei.h> 65 #include <sys/proc.h> 66 #include <sys/dirent.h> 67 #include <sys/file.h> 68 #include <sys/stat.h> 69 #include <sys/filedesc.h> 70 #include <sys/ioctl.h> 71 #include <sys/kernel.h> 72 #include <sys/malloc.h> 73 #include <sys/mbuf.h> 74 #include <sys/mman.h> 75 #include <sys/mount.h> 76 #include <sys/poll.h> 77 #include <sys/prot.h> 78 #include <sys/reboot.h> 79 #include <sys/resource.h> 80 #include <sys/resourcevar.h> 81 #include <sys/select.h> 82 #include <sys/signal.h> 83 #include <sys/signalvar.h> 84 #include <sys/socket.h> 85 #include <sys/time.h> 86 #include <sys/times.h> 87 #include <sys/vnode.h> 88 #include <sys/uio.h> 89 #include <sys/wait.h> 90 #include <sys/utsname.h> 91 #include <sys/unistd.h> 92 #include <sys/vfs_syscalls.h> 93 #include <sys/swap.h> /* for SWAP_ON */ 94 #include <sys/sysctl.h> /* for KERN_DOMAINNAME */ 95 #include <sys/kauth.h> 96 97 #include <sys/ptrace.h> 98 #include <machine/ptrace.h> 99 100 #include <sys/syscall.h> 101 #include <sys/syscallargs.h> 102 103 #include <compat/sys/resource.h> 104 105 #include <compat/linux/common/linux_machdep.h> 106 #include <compat/linux/common/linux_types.h> 107 #include <compat/linux/common/linux_signal.h> 108 #include <compat/linux/common/linux_ipc.h> 109 #include <compat/linux/common/linux_sem.h> 110 111 #include <compat/linux/common/linux_fcntl.h> 112 #include <compat/linux/common/linux_mmap.h> 113 #include <compat/linux/common/linux_dirent.h> 114 #include <compat/linux/common/linux_util.h> 115 #include <compat/linux/common/linux_misc.h> 116 #include <compat/linux/common/linux_statfs.h> 117 #include <compat/linux/common/linux_limit.h> 118 #include <compat/linux/common/linux_ptrace.h> 119 #include <compat/linux/common/linux_reboot.h> 120 #include <compat/linux/common/linux_emuldata.h> 121 #include <compat/linux/common/linux_sched.h> 122 123 #include <compat/linux/linux_syscallargs.h> 124 125 const int linux_ptrace_request_map[] = { 126 LINUX_PTRACE_TRACEME, PT_TRACE_ME, 127 LINUX_PTRACE_PEEKTEXT, PT_READ_I, 128 LINUX_PTRACE_PEEKDATA, PT_READ_D, 129 LINUX_PTRACE_POKETEXT, PT_WRITE_I, 130 LINUX_PTRACE_POKEDATA, PT_WRITE_D, 131 LINUX_PTRACE_CONT, PT_CONTINUE, 132 LINUX_PTRACE_KILL, PT_KILL, 133 LINUX_PTRACE_ATTACH, PT_ATTACH, 134 LINUX_PTRACE_DETACH, PT_DETACH, 135 # ifdef PT_STEP 136 LINUX_PTRACE_SINGLESTEP, PT_STEP, 137 # endif 138 LINUX_PTRACE_SYSCALL, PT_SYSCALL, 139 -1 140 }; 141 142 const struct linux_mnttypes linux_fstypes[] = { 143 { MOUNT_FFS, LINUX_DEFAULT_SUPER_MAGIC }, 144 { MOUNT_NFS, LINUX_NFS_SUPER_MAGIC }, 145 { MOUNT_MFS, LINUX_DEFAULT_SUPER_MAGIC }, 146 { MOUNT_MSDOS, LINUX_MSDOS_SUPER_MAGIC }, 147 { MOUNT_LFS, LINUX_DEFAULT_SUPER_MAGIC }, 148 { MOUNT_FDESC, LINUX_DEFAULT_SUPER_MAGIC }, 149 { MOUNT_NULL, LINUX_DEFAULT_SUPER_MAGIC }, 150 { MOUNT_OVERLAY, LINUX_DEFAULT_SUPER_MAGIC }, 151 { MOUNT_UMAP, LINUX_DEFAULT_SUPER_MAGIC }, 152 { MOUNT_KERNFS, LINUX_DEFAULT_SUPER_MAGIC }, 153 { MOUNT_PROCFS, LINUX_PROC_SUPER_MAGIC }, 154 { MOUNT_AFS, LINUX_DEFAULT_SUPER_MAGIC }, 155 { MOUNT_CD9660, LINUX_ISOFS_SUPER_MAGIC }, 156 { MOUNT_UNION, LINUX_DEFAULT_SUPER_MAGIC }, 157 { MOUNT_ADOSFS, LINUX_ADFS_SUPER_MAGIC }, 158 { MOUNT_EXT2FS, LINUX_EXT2_SUPER_MAGIC }, 159 { MOUNT_CFS, LINUX_DEFAULT_SUPER_MAGIC }, 160 { MOUNT_CODA, LINUX_CODA_SUPER_MAGIC }, 161 { MOUNT_FILECORE, LINUX_DEFAULT_SUPER_MAGIC }, 162 { MOUNT_NTFS, LINUX_DEFAULT_SUPER_MAGIC }, 163 { MOUNT_SMBFS, LINUX_SMB_SUPER_MAGIC }, 164 { MOUNT_PTYFS, LINUX_DEVPTS_SUPER_MAGIC }, 165 { MOUNT_TMPFS, LINUX_TMPFS_SUPER_MAGIC } 166 }; 167 const int linux_fstypes_cnt = sizeof(linux_fstypes) / sizeof(linux_fstypes[0]); 168 169 # ifdef DEBUG_LINUX 170 #define DPRINTF(a) uprintf a 171 # else 172 #define DPRINTF(a) 173 # endif 174 175 /* Local linux_misc.c functions: */ 176 static void linux_to_bsd_mmap_args(struct sys_mmap_args *, 177 const struct linux_sys_mmap_args *); 178 static int linux_mmap(struct lwp *, const struct linux_sys_mmap_args *, 179 register_t *, off_t); 180 181 182 /* 183 * The information on a terminated (or stopped) process needs 184 * to be converted in order for Linux binaries to get a valid signal 185 * number out of it. 186 */ 187 int 188 bsd_to_linux_wstat(int st) 189 { 190 191 int sig; 192 193 if (WIFSIGNALED(st)) { 194 sig = WTERMSIG(st); 195 if (sig >= 0 && sig < NSIG) 196 st= (st & ~0177) | native_to_linux_signo[sig]; 197 } else if (WIFSTOPPED(st)) { 198 sig = WSTOPSIG(st); 199 if (sig >= 0 && sig < NSIG) 200 st = (st & ~0xff00) | 201 (native_to_linux_signo[sig] << 8); 202 } 203 return st; 204 } 205 206 /* 207 * wait4(2). Passed on to the NetBSD call, surrounded by code to 208 * reserve some space for a NetBSD-style wait status, and converting 209 * it to what Linux wants. 210 */ 211 int 212 linux_sys_wait4(struct lwp *l, const struct linux_sys_wait4_args *uap, register_t *retval) 213 { 214 /* { 215 syscallarg(int) pid; 216 syscallarg(int *) status; 217 syscallarg(int) options; 218 syscallarg(struct rusage50 *) rusage; 219 } */ 220 int error, status, options, linux_options, pid = SCARG(uap, pid); 221 struct rusage50 ru50; 222 struct rusage ru; 223 proc_t *p; 224 225 linux_options = SCARG(uap, options); 226 if (linux_options & ~(LINUX_WAIT4_KNOWNFLAGS)) 227 return (EINVAL); 228 229 options = 0; 230 if (linux_options & LINUX_WAIT4_WNOHANG) 231 options |= WNOHANG; 232 if (linux_options & LINUX_WAIT4_WUNTRACED) 233 options |= WUNTRACED; 234 if (linux_options & LINUX_WAIT4_WCONTINUED) 235 options |= WCONTINUED; 236 if (linux_options & LINUX_WAIT4_WALL) 237 options |= WALLSIG; 238 if (linux_options & LINUX_WAIT4_WCLONE) 239 options |= WALTSIG; 240 # ifdef DIAGNOSTIC 241 if (linux_options & LINUX_WAIT4_WNOTHREAD) 242 printf("WARNING: %s: linux process %d.%d called " 243 "waitpid with __WNOTHREAD set!", 244 __FILE__, l->l_proc->p_pid, l->l_lid); 245 246 # endif 247 248 error = do_sys_wait(&pid, &status, options, 249 SCARG(uap, rusage) != NULL ? &ru : NULL); 250 251 retval[0] = pid; 252 if (pid == 0) 253 return error; 254 255 p = curproc; 256 mutex_enter(p->p_lock); 257 sigdelset(&p->p_sigpend.sp_set, SIGCHLD); /* XXXAD ksiginfo leak */ 258 mutex_exit(p->p_lock); 259 260 if (SCARG(uap, rusage) != NULL) { 261 rusage_to_rusage50(&ru, &ru50); 262 error = copyout(&ru, SCARG(uap, rusage), sizeof(ru)); 263 } 264 265 if (error == 0 && SCARG(uap, status) != NULL) { 266 status = bsd_to_linux_wstat(status); 267 error = copyout(&status, SCARG(uap, status), sizeof status); 268 } 269 270 return error; 271 } 272 273 /* 274 * Linux brk(2). Like native, but always return the new break value. 275 */ 276 int 277 linux_sys_brk(struct lwp *l, const struct linux_sys_brk_args *uap, register_t *retval) 278 { 279 /* { 280 syscallarg(char *) nsize; 281 } */ 282 struct proc *p = l->l_proc; 283 struct vmspace *vm = p->p_vmspace; 284 struct sys_obreak_args oba; 285 286 SCARG(&oba, nsize) = SCARG(uap, nsize); 287 288 (void) sys_obreak(l, &oba, retval); 289 retval[0] = (register_t)((char *)vm->vm_daddr + ptoa(vm->vm_dsize)); 290 return 0; 291 } 292 293 /* 294 * Implement the fs stat functions. Straightforward. 295 */ 296 int 297 linux_sys_statfs(struct lwp *l, const struct linux_sys_statfs_args *uap, register_t *retval) 298 { 299 /* { 300 syscallarg(const char *) path; 301 syscallarg(struct linux_statfs *) sp; 302 } */ 303 struct statvfs *sb; 304 struct linux_statfs ltmp; 305 int error; 306 307 sb = STATVFSBUF_GET(); 308 error = do_sys_pstatvfs(l, SCARG(uap, path), ST_WAIT, sb); 309 if (error == 0) { 310 bsd_to_linux_statfs(sb, <mp); 311 error = copyout(<mp, SCARG(uap, sp), sizeof ltmp); 312 } 313 STATVFSBUF_PUT(sb); 314 315 return error; 316 } 317 318 int 319 linux_sys_fstatfs(struct lwp *l, const struct linux_sys_fstatfs_args *uap, register_t *retval) 320 { 321 /* { 322 syscallarg(int) fd; 323 syscallarg(struct linux_statfs *) sp; 324 } */ 325 struct statvfs *sb; 326 struct linux_statfs ltmp; 327 int error; 328 329 sb = STATVFSBUF_GET(); 330 error = do_sys_fstatvfs(l, SCARG(uap, fd), ST_WAIT, sb); 331 if (error == 0) { 332 bsd_to_linux_statfs(sb, <mp); 333 error = copyout(<mp, SCARG(uap, sp), sizeof ltmp); 334 } 335 STATVFSBUF_PUT(sb); 336 337 return error; 338 } 339 340 /* 341 * uname(). Just copy the info from the various strings stored in the 342 * kernel, and put it in the Linux utsname structure. That structure 343 * is almost the same as the NetBSD one, only it has fields 65 characters 344 * long, and an extra domainname field. 345 */ 346 int 347 linux_sys_uname(struct lwp *l, const struct linux_sys_uname_args *uap, register_t *retval) 348 { 349 /* { 350 syscallarg(struct linux_utsname *) up; 351 } */ 352 struct linux_utsname luts; 353 354 strlcpy(luts.l_sysname, linux_sysname, sizeof(luts.l_sysname)); 355 strlcpy(luts.l_nodename, hostname, sizeof(luts.l_nodename)); 356 strlcpy(luts.l_release, linux_release, sizeof(luts.l_release)); 357 strlcpy(luts.l_version, linux_version, sizeof(luts.l_version)); 358 strlcpy(luts.l_machine, LINUX_UNAME_ARCH, sizeof(luts.l_machine)); 359 strlcpy(luts.l_domainname, domainname, sizeof(luts.l_domainname)); 360 361 return copyout(&luts, SCARG(uap, up), sizeof(luts)); 362 } 363 364 /* Used directly on: alpha, mips, ppc, sparc, sparc64 */ 365 /* Used indirectly on: arm, i386, m68k */ 366 367 /* 368 * New type Linux mmap call. 369 * Only called directly on machines with >= 6 free regs. 370 */ 371 int 372 linux_sys_mmap(struct lwp *l, const struct linux_sys_mmap_args *uap, register_t *retval) 373 { 374 /* { 375 syscallarg(unsigned long) addr; 376 syscallarg(size_t) len; 377 syscallarg(int) prot; 378 syscallarg(int) flags; 379 syscallarg(int) fd; 380 syscallarg(linux_off_t) offset; 381 } */ 382 383 if (SCARG(uap, offset) & PAGE_MASK) 384 return EINVAL; 385 386 return linux_mmap(l, uap, retval, SCARG(uap, offset)); 387 } 388 389 /* 390 * Guts of most architectures' mmap64() implementations. This shares 391 * its list of arguments with linux_sys_mmap(). 392 * 393 * The difference in linux_sys_mmap2() is that "offset" is actually 394 * (offset / pagesize), not an absolute byte count. This translation 395 * to pagesize offsets is done inside glibc between the mmap64() call 396 * point, and the actual syscall. 397 */ 398 int 399 linux_sys_mmap2(struct lwp *l, const struct linux_sys_mmap2_args *uap, register_t *retval) 400 { 401 /* { 402 syscallarg(unsigned long) addr; 403 syscallarg(size_t) len; 404 syscallarg(int) prot; 405 syscallarg(int) flags; 406 syscallarg(int) fd; 407 syscallarg(linux_off_t) offset; 408 } */ 409 410 return linux_mmap(l, uap, retval, 411 ((off_t)SCARG(uap, offset)) << PAGE_SHIFT); 412 } 413 414 /* 415 * Massage arguments and call system mmap(2). 416 */ 417 static int 418 linux_mmap(struct lwp *l, const struct linux_sys_mmap_args *uap, register_t *retval, off_t offset) 419 { 420 struct sys_mmap_args cma; 421 int error; 422 size_t mmoff=0; 423 424 linux_to_bsd_mmap_args(&cma, uap); 425 SCARG(&cma, pos) = offset; 426 427 if (SCARG(uap, flags) & LINUX_MAP_GROWSDOWN) { 428 /* 429 * Request for stack-like memory segment. On linux, this 430 * works by mmap()ping (small) segment, which is automatically 431 * extended when page fault happens below the currently 432 * allocated area. We emulate this by allocating (typically 433 * bigger) segment sized at current stack size limit, and 434 * offsetting the requested and returned address accordingly. 435 * Since physical pages are only allocated on-demand, this 436 * is effectively identical. 437 */ 438 rlim_t ssl = l->l_proc->p_rlimit[RLIMIT_STACK].rlim_cur; 439 440 if (SCARG(&cma, len) < ssl) { 441 /* Compute the address offset */ 442 mmoff = round_page(ssl) - SCARG(uap, len); 443 444 if (SCARG(&cma, addr)) 445 SCARG(&cma, addr) = (char *)SCARG(&cma, addr) - mmoff; 446 447 SCARG(&cma, len) = (size_t) ssl; 448 } 449 } 450 451 error = sys_mmap(l, &cma, retval); 452 if (error) 453 return (error); 454 455 /* Shift the returned address for stack-like segment if necessary */ 456 retval[0] += mmoff; 457 458 return (0); 459 } 460 461 static void 462 linux_to_bsd_mmap_args(struct sys_mmap_args *cma, const struct linux_sys_mmap_args *uap) 463 { 464 int flags = MAP_TRYFIXED, fl = SCARG(uap, flags); 465 466 flags |= cvtto_bsd_mask(fl, LINUX_MAP_SHARED, MAP_SHARED); 467 flags |= cvtto_bsd_mask(fl, LINUX_MAP_PRIVATE, MAP_PRIVATE); 468 flags |= cvtto_bsd_mask(fl, LINUX_MAP_FIXED, MAP_FIXED); 469 flags |= cvtto_bsd_mask(fl, LINUX_MAP_ANON, MAP_ANON); 470 flags |= cvtto_bsd_mask(fl, LINUX_MAP_LOCKED, MAP_WIRED); 471 /* XXX XAX ERH: Any other flags here? There are more defined... */ 472 473 SCARG(cma, addr) = (void *)SCARG(uap, addr); 474 SCARG(cma, len) = SCARG(uap, len); 475 SCARG(cma, prot) = SCARG(uap, prot); 476 if (SCARG(cma, prot) & VM_PROT_WRITE) /* XXX */ 477 SCARG(cma, prot) |= VM_PROT_READ; 478 SCARG(cma, flags) = flags; 479 SCARG(cma, fd) = flags & MAP_ANON ? -1 : SCARG(uap, fd); 480 SCARG(cma, PAD) = 0; 481 } 482 483 #define LINUX_MREMAP_MAYMOVE 1 484 #define LINUX_MREMAP_FIXED 2 485 486 int 487 linux_sys_mremap(struct lwp *l, const struct linux_sys_mremap_args *uap, register_t *retval) 488 { 489 /* { 490 syscallarg(void *) old_address; 491 syscallarg(size_t) old_size; 492 syscallarg(size_t) new_size; 493 syscallarg(u_long) flags; 494 } */ 495 496 struct proc *p; 497 struct vm_map *map; 498 vaddr_t oldva; 499 vaddr_t newva; 500 size_t oldsize; 501 size_t newsize; 502 int flags; 503 int uvmflags; 504 int error; 505 506 flags = SCARG(uap, flags); 507 oldva = (vaddr_t)SCARG(uap, old_address); 508 oldsize = round_page(SCARG(uap, old_size)); 509 newsize = round_page(SCARG(uap, new_size)); 510 if ((flags & ~(LINUX_MREMAP_FIXED|LINUX_MREMAP_MAYMOVE)) != 0) { 511 error = EINVAL; 512 goto done; 513 } 514 if ((flags & LINUX_MREMAP_FIXED) != 0) { 515 if ((flags & LINUX_MREMAP_MAYMOVE) == 0) { 516 error = EINVAL; 517 goto done; 518 } 519 #if 0 /* notyet */ 520 newva = SCARG(uap, new_address); 521 uvmflags = MAP_FIXED; 522 #else /* notyet */ 523 error = EOPNOTSUPP; 524 goto done; 525 #endif /* notyet */ 526 } else if ((flags & LINUX_MREMAP_MAYMOVE) != 0) { 527 uvmflags = 0; 528 } else { 529 newva = oldva; 530 uvmflags = MAP_FIXED; 531 } 532 p = l->l_proc; 533 map = &p->p_vmspace->vm_map; 534 error = uvm_mremap(map, oldva, oldsize, map, &newva, newsize, p, 535 uvmflags); 536 537 done: 538 *retval = (error != 0) ? 0 : (register_t)newva; 539 return error; 540 } 541 542 #ifdef USRSTACK 543 int 544 linux_sys_mprotect(struct lwp *l, const struct linux_sys_mprotect_args *uap, register_t *retval) 545 { 546 /* { 547 syscallarg(const void *) start; 548 syscallarg(unsigned long) len; 549 syscallarg(int) prot; 550 } */ 551 struct vm_map_entry *entry; 552 struct vm_map *map; 553 struct proc *p; 554 vaddr_t end, start, len, stacklim; 555 int prot, grows; 556 557 start = (vaddr_t)SCARG(uap, start); 558 len = round_page(SCARG(uap, len)); 559 prot = SCARG(uap, prot); 560 grows = prot & (LINUX_PROT_GROWSDOWN | LINUX_PROT_GROWSUP); 561 prot &= ~grows; 562 end = start + len; 563 564 if (start & PAGE_MASK) 565 return EINVAL; 566 if (end < start) 567 return EINVAL; 568 if (end == start) 569 return 0; 570 571 if (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC)) 572 return EINVAL; 573 if (grows == (LINUX_PROT_GROWSDOWN | LINUX_PROT_GROWSUP)) 574 return EINVAL; 575 576 p = l->l_proc; 577 map = &p->p_vmspace->vm_map; 578 vm_map_lock(map); 579 # ifdef notdef 580 VM_MAP_RANGE_CHECK(map, start, end); 581 # endif 582 if (!uvm_map_lookup_entry(map, start, &entry) || entry->start > start) { 583 vm_map_unlock(map); 584 return ENOMEM; 585 } 586 587 /* 588 * Approximate the behaviour of PROT_GROWS{DOWN,UP}. 589 */ 590 591 stacklim = (vaddr_t)p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_cur; 592 if (grows & LINUX_PROT_GROWSDOWN) { 593 if (USRSTACK - stacklim <= start && start < USRSTACK) { 594 start = USRSTACK - stacklim; 595 } else { 596 start = entry->start; 597 } 598 } else if (grows & LINUX_PROT_GROWSUP) { 599 if (USRSTACK <= end && end < USRSTACK + stacklim) { 600 end = USRSTACK + stacklim; 601 } else { 602 end = entry->end; 603 } 604 } 605 vm_map_unlock(map); 606 return uvm_map_protect_user(l, start, end, prot); 607 } 608 #endif /* USRSTACK */ 609 610 /* 611 * This code is partly stolen from src/lib/libc/compat-43/times.c 612 */ 613 614 #define CONVTCK(r) (r.tv_sec * hz + r.tv_usec / (1000000 / hz)) 615 616 int 617 linux_sys_times(struct lwp *l, const struct linux_sys_times_args *uap, register_t *retval) 618 { 619 /* { 620 syscallarg(struct times *) tms; 621 } */ 622 struct proc *p = l->l_proc; 623 struct timeval t; 624 int error; 625 626 if (SCARG(uap, tms)) { 627 struct linux_tms ltms; 628 struct rusage ru; 629 630 mutex_enter(p->p_lock); 631 calcru(p, &ru.ru_utime, &ru.ru_stime, NULL, NULL); 632 ltms.ltms_utime = CONVTCK(ru.ru_utime); 633 ltms.ltms_stime = CONVTCK(ru.ru_stime); 634 ltms.ltms_cutime = CONVTCK(p->p_stats->p_cru.ru_utime); 635 ltms.ltms_cstime = CONVTCK(p->p_stats->p_cru.ru_stime); 636 mutex_exit(p->p_lock); 637 638 if ((error = copyout(<ms, SCARG(uap, tms), sizeof ltms))) 639 return error; 640 } 641 642 getmicrouptime(&t); 643 644 retval[0] = ((linux_clock_t)(CONVTCK(t))); 645 return 0; 646 } 647 648 #undef CONVTCK 649 650 /* 651 * Linux 'readdir' call. This code is mostly taken from the 652 * SunOS getdents call (see compat/sunos/sunos_misc.c), though 653 * an attempt has been made to keep it a little cleaner (failing 654 * miserably, because of the cruft needed if count 1 is passed). 655 * 656 * The d_off field should contain the offset of the next valid entry, 657 * but in Linux it has the offset of the entry itself. We emulate 658 * that bug here. 659 * 660 * Read in BSD-style entries, convert them, and copy them out. 661 * 662 * Note that this doesn't handle union-mounted filesystems. 663 */ 664 int 665 linux_sys_getdents(struct lwp *l, const struct linux_sys_getdents_args *uap, register_t *retval) 666 { 667 /* { 668 syscallarg(int) fd; 669 syscallarg(struct linux_dirent *) dent; 670 syscallarg(unsigned int) count; 671 } */ 672 struct dirent *bdp; 673 struct vnode *vp; 674 char *inp, *tbuf; /* BSD-format */ 675 int len, reclen; /* BSD-format */ 676 char *outp; /* Linux-format */ 677 int resid, linux_reclen = 0; /* Linux-format */ 678 struct file *fp; 679 struct uio auio; 680 struct iovec aiov; 681 struct linux_dirent idb; 682 off_t off; /* true file offset */ 683 int buflen, error, eofflag, nbytes, oldcall; 684 struct vattr va; 685 off_t *cookiebuf = NULL, *cookie; 686 int ncookies; 687 688 /* fd_getvnode() will use the descriptor for us */ 689 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 690 return (error); 691 692 if ((fp->f_flag & FREAD) == 0) { 693 error = EBADF; 694 goto out1; 695 } 696 697 vp = (struct vnode *)fp->f_data; 698 if (vp->v_type != VDIR) { 699 error = ENOTDIR; 700 goto out1; 701 } 702 703 vn_lock(vp, LK_SHARED | LK_RETRY); 704 error = VOP_GETATTR(vp, &va, l->l_cred); 705 VOP_UNLOCK(vp); 706 if (error) 707 goto out1; 708 709 nbytes = SCARG(uap, count); 710 if (nbytes == 1) { /* emulating old, broken behaviour */ 711 nbytes = sizeof (idb); 712 buflen = max(va.va_blocksize, nbytes); 713 oldcall = 1; 714 } else { 715 buflen = min(MAXBSIZE, nbytes); 716 if (buflen < va.va_blocksize) 717 buflen = va.va_blocksize; 718 oldcall = 0; 719 } 720 tbuf = malloc(buflen, M_TEMP, M_WAITOK); 721 722 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 723 off = fp->f_offset; 724 again: 725 aiov.iov_base = tbuf; 726 aiov.iov_len = buflen; 727 auio.uio_iov = &aiov; 728 auio.uio_iovcnt = 1; 729 auio.uio_rw = UIO_READ; 730 auio.uio_resid = buflen; 731 auio.uio_offset = off; 732 UIO_SETUP_SYSSPACE(&auio); 733 /* 734 * First we read into the malloc'ed buffer, then 735 * we massage it into user space, one record at a time. 736 */ 737 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, &cookiebuf, 738 &ncookies); 739 if (error) 740 goto out; 741 742 inp = tbuf; 743 outp = (void *)SCARG(uap, dent); 744 resid = nbytes; 745 if ((len = buflen - auio.uio_resid) == 0) 746 goto eof; 747 748 for (cookie = cookiebuf; len > 0; len -= reclen) { 749 bdp = (struct dirent *)inp; 750 reclen = bdp->d_reclen; 751 if (reclen & 3) 752 panic("linux_readdir"); 753 if (bdp->d_fileno == 0) { 754 inp += reclen; /* it is a hole; squish it out */ 755 if (cookie) 756 off = *cookie++; 757 else 758 off += reclen; 759 continue; 760 } 761 linux_reclen = LINUX_RECLEN(&idb, bdp->d_namlen); 762 if (reclen > len || resid < linux_reclen) { 763 /* entry too big for buffer, so just stop */ 764 outp++; 765 break; 766 } 767 /* 768 * Massage in place to make a Linux-shaped dirent (otherwise 769 * we have to worry about touching user memory outside of 770 * the copyout() call). 771 */ 772 idb.d_ino = bdp->d_fileno; 773 /* 774 * The old readdir() call misuses the offset and reclen fields. 775 */ 776 if (oldcall) { 777 idb.d_off = (linux_off_t)linux_reclen; 778 idb.d_reclen = (u_short)bdp->d_namlen; 779 } else { 780 if (sizeof (idb.d_off) <= 4 && (off >> 32) != 0) { 781 compat_offseterr(vp, "linux_getdents"); 782 error = EINVAL; 783 goto out; 784 } 785 idb.d_off = (linux_off_t)off; 786 idb.d_reclen = (u_short)linux_reclen; 787 /* Linux puts d_type at the end of each record */ 788 *((char *)&idb + idb.d_reclen - 1) = bdp->d_type; 789 } 790 memcpy(idb.d_name, bdp->d_name, 791 MIN(sizeof(idb.d_name), bdp->d_namlen + 1)); 792 if ((error = copyout((void *)&idb, outp, linux_reclen))) 793 goto out; 794 /* advance past this real entry */ 795 inp += reclen; 796 if (cookie) 797 off = *cookie++; /* each entry points to itself */ 798 else 799 off += reclen; 800 /* advance output past Linux-shaped entry */ 801 outp += linux_reclen; 802 resid -= linux_reclen; 803 if (oldcall) 804 break; 805 } 806 807 /* if we squished out the whole block, try again */ 808 if (outp == (void *)SCARG(uap, dent)) { 809 if (cookiebuf) 810 free(cookiebuf, M_TEMP); 811 cookiebuf = NULL; 812 goto again; 813 } 814 fp->f_offset = off; /* update the vnode offset */ 815 816 if (oldcall) 817 nbytes = resid + linux_reclen; 818 819 eof: 820 *retval = nbytes - resid; 821 out: 822 VOP_UNLOCK(vp); 823 if (cookiebuf) 824 free(cookiebuf, M_TEMP); 825 free(tbuf, M_TEMP); 826 out1: 827 fd_putfile(SCARG(uap, fd)); 828 return error; 829 } 830 831 /* 832 * Even when just using registers to pass arguments to syscalls you can 833 * have 5 of them on the i386. So this newer version of select() does 834 * this. 835 */ 836 int 837 linux_sys_select(struct lwp *l, const struct linux_sys_select_args *uap, register_t *retval) 838 { 839 /* { 840 syscallarg(int) nfds; 841 syscallarg(fd_set *) readfds; 842 syscallarg(fd_set *) writefds; 843 syscallarg(fd_set *) exceptfds; 844 syscallarg(struct timeval50 *) timeout; 845 } */ 846 847 return linux_select1(l, retval, SCARG(uap, nfds), SCARG(uap, readfds), 848 SCARG(uap, writefds), SCARG(uap, exceptfds), 849 (struct linux_timeval *)SCARG(uap, timeout)); 850 } 851 852 /* 853 * Common code for the old and new versions of select(). A couple of 854 * things are important: 855 * 1) return the amount of time left in the 'timeout' parameter 856 * 2) select never returns ERESTART on Linux, always return EINTR 857 */ 858 int 859 linux_select1(struct lwp *l, register_t *retval, int nfds, fd_set *readfds, 860 fd_set *writefds, fd_set *exceptfds, struct linux_timeval *timeout) 861 { 862 struct timespec ts0, ts1, uts, *ts = NULL; 863 struct linux_timeval ltv; 864 int error; 865 866 /* 867 * Store current time for computation of the amount of 868 * time left. 869 */ 870 if (timeout) { 871 if ((error = copyin(timeout, <v, sizeof(ltv)))) 872 return error; 873 uts.tv_sec = ltv.tv_sec; 874 uts.tv_nsec = ltv.tv_usec * 1000; 875 if (itimespecfix(&uts)) { 876 /* 877 * The timeval was invalid. Convert it to something 878 * valid that will act as it does under Linux. 879 */ 880 uts.tv_sec += uts.tv_nsec / 1000000000; 881 uts.tv_nsec %= 1000000000; 882 if (uts.tv_nsec < 0) { 883 uts.tv_sec -= 1; 884 uts.tv_nsec += 1000000000; 885 } 886 if (uts.tv_sec < 0) 887 timespecclear(&uts); 888 } 889 ts = &uts; 890 nanotime(&ts0); 891 } 892 893 error = selcommon(retval, nfds, readfds, writefds, exceptfds, ts, NULL); 894 895 if (error) { 896 /* 897 * See fs/select.c in the Linux kernel. Without this, 898 * Maelstrom doesn't work. 899 */ 900 if (error == ERESTART) 901 error = EINTR; 902 return error; 903 } 904 905 if (timeout) { 906 if (*retval) { 907 /* 908 * Compute how much time was left of the timeout, 909 * by subtracting the current time and the time 910 * before we started the call, and subtracting 911 * that result from the user-supplied value. 912 */ 913 nanotime(&ts1); 914 timespecsub(&ts1, &ts0, &ts1); 915 timespecsub(&uts, &ts1, &uts); 916 if (uts.tv_sec < 0) 917 timespecclear(&uts); 918 } else 919 timespecclear(&uts); 920 ltv.tv_sec = uts.tv_sec; 921 ltv.tv_usec = uts.tv_nsec / 1000; 922 if ((error = copyout(<v, timeout, sizeof(ltv)))) 923 return error; 924 } 925 926 return 0; 927 } 928 929 /* 930 * Derived from FreeBSD's sys/compat/linux/linux_misc.c:linux_pselect6() 931 * which was contributed by Dmitry Chagin 932 * https://svnweb.freebsd.org/base?view=revision&revision=283403 933 */ 934 int 935 linux_sys_pselect6(struct lwp *l, 936 const struct linux_sys_pselect6_args *uap, register_t *retval) 937 { 938 /* { 939 syscallarg(int) nfds; 940 syscallarg(fd_set *) readfds; 941 syscallarg(fd_set *) writefds; 942 syscallarg(fd_set *) exceptfds; 943 syscallarg(struct timespec *) timeout; 944 syscallarg(linux_sized_sigset_t *) ss; 945 } */ 946 struct timespec uts, ts0, ts1, *tsp; 947 linux_sized_sigset_t lsss; 948 struct linux_timespec lts; 949 linux_sigset_t lss; 950 sigset_t *ssp; 951 sigset_t ss; 952 int error; 953 954 ssp = NULL; 955 if (SCARG(uap, ss) != NULL) { 956 if ((error = copyin(SCARG(uap, ss), &lsss, sizeof(lsss))) != 0) 957 return (error); 958 if (lsss.ss_len != sizeof(lss)) 959 return (EINVAL); 960 if (lsss.ss != NULL) { 961 if ((error = copyin(lsss.ss, &lss, sizeof(lss))) != 0) 962 return (error); 963 linux_to_native_sigset(&ss, &lss); 964 ssp = &ss; 965 } 966 } 967 968 if (SCARG(uap, timeout) != NULL) { 969 error = copyin(SCARG(uap, timeout), <s, sizeof(lts)); 970 if (error != 0) 971 return (error); 972 linux_to_native_timespec(&uts, <s); 973 974 if (itimespecfix(&uts)) 975 return (EINVAL); 976 977 nanotime(&ts0); 978 tsp = &uts; 979 } else { 980 tsp = NULL; 981 } 982 983 error = selcommon(retval, SCARG(uap, nfds), SCARG(uap, readfds), 984 SCARG(uap, writefds), SCARG(uap, exceptfds), tsp, ssp); 985 986 if (error == 0 && tsp != NULL) { 987 if (retval != 0) { 988 /* 989 * Compute how much time was left of the timeout, 990 * by subtracting the current time and the time 991 * before we started the call, and subtracting 992 * that result from the user-supplied value. 993 */ 994 nanotime(&ts1); 995 timespecsub(&ts1, &ts0, &ts1); 996 timespecsub(&uts, &ts1, &uts); 997 if (uts.tv_sec < 0) 998 timespecclear(&uts); 999 } else { 1000 timespecclear(&uts); 1001 } 1002 1003 native_to_linux_timespec(<s, &uts); 1004 error = copyout(<s, SCARG(uap, timeout), sizeof(lts)); 1005 } 1006 1007 return (error); 1008 } 1009 1010 int 1011 linux_sys_ppoll(struct lwp *l, 1012 const struct linux_sys_ppoll_args *uap, register_t *retval) 1013 { 1014 /* { 1015 syscallarg(struct pollfd *) fds; 1016 syscallarg(u_int) nfds; 1017 syscallarg(struct linux_timespec *) timeout; 1018 syscallarg(linux_sigset_t *) sigset; 1019 } */ 1020 struct linux_timespec lts0, *lts; 1021 struct timespec ts0, *ts = NULL; 1022 linux_sigset_t lsigmask0, *lsigmask; 1023 sigset_t sigmask0, *sigmask = NULL; 1024 int error; 1025 1026 lts = SCARG(uap, timeout); 1027 if (lts) { 1028 if ((error = copyin(lts, <s0, sizeof(lts0))) != 0) 1029 return error; 1030 linux_to_native_timespec(&ts0, <s0); 1031 ts = &ts0; 1032 } 1033 1034 lsigmask = SCARG(uap, sigset); 1035 if (lsigmask) { 1036 if ((error = copyin(lsigmask, &lsigmask0, sizeof(lsigmask0)))) 1037 return error; 1038 linux_to_native_sigset(&sigmask0, &lsigmask0); 1039 sigmask = &sigmask0; 1040 } 1041 1042 return pollcommon(retval, SCARG(uap, fds), SCARG(uap, nfds), 1043 ts, sigmask); 1044 } 1045 1046 /* 1047 * Set the 'personality' (emulation mode) for the current process. Only 1048 * accept the Linux personality here (0). This call is needed because 1049 * the Linux ELF crt0 issues it in an ugly kludge to make sure that 1050 * ELF binaries run in Linux mode, not SVR4 mode. 1051 */ 1052 int 1053 linux_sys_personality(struct lwp *l, const struct linux_sys_personality_args *uap, register_t *retval) 1054 { 1055 /* { 1056 syscallarg(unsigned long) per; 1057 } */ 1058 struct linux_emuldata *led; 1059 int per; 1060 1061 per = SCARG(uap, per); 1062 led = l->l_emuldata; 1063 if (per == LINUX_PER_QUERY) { 1064 retval[0] = led->led_personality; 1065 return 0; 1066 } 1067 1068 switch (per & LINUX_PER_MASK) { 1069 case LINUX_PER_LINUX: 1070 case LINUX_PER_LINUX32: 1071 led->led_personality = per; 1072 break; 1073 1074 default: 1075 return EINVAL; 1076 } 1077 1078 retval[0] = per; 1079 return 0; 1080 } 1081 1082 /* 1083 * We have nonexistent fsuid equal to uid. 1084 * If modification is requested, refuse. 1085 */ 1086 int 1087 linux_sys_setfsuid(struct lwp *l, const struct linux_sys_setfsuid_args *uap, register_t *retval) 1088 { 1089 /* { 1090 syscallarg(uid_t) uid; 1091 } */ 1092 uid_t uid; 1093 1094 uid = SCARG(uap, uid); 1095 if (kauth_cred_getuid(l->l_cred) != uid) 1096 return sys_nosys(l, uap, retval); 1097 1098 *retval = uid; 1099 return 0; 1100 } 1101 1102 int 1103 linux_sys_setfsgid(struct lwp *l, const struct linux_sys_setfsgid_args *uap, register_t *retval) 1104 { 1105 /* { 1106 syscallarg(gid_t) gid; 1107 } */ 1108 gid_t gid; 1109 1110 gid = SCARG(uap, gid); 1111 if (kauth_cred_getgid(l->l_cred) != gid) 1112 return sys_nosys(l, uap, retval); 1113 1114 *retval = gid; 1115 return 0; 1116 } 1117 1118 int 1119 linux_sys_setresuid(struct lwp *l, const struct linux_sys_setresuid_args *uap, register_t *retval) 1120 { 1121 /* { 1122 syscallarg(uid_t) ruid; 1123 syscallarg(uid_t) euid; 1124 syscallarg(uid_t) suid; 1125 } */ 1126 1127 /* 1128 * Note: These checks are a little different than the NetBSD 1129 * setreuid(2) call performs. This precisely follows the 1130 * behavior of the Linux kernel. 1131 */ 1132 1133 return do_setresuid(l, SCARG(uap, ruid), SCARG(uap, euid), 1134 SCARG(uap, suid), 1135 ID_R_EQ_R | ID_R_EQ_E | ID_R_EQ_S | 1136 ID_E_EQ_R | ID_E_EQ_E | ID_E_EQ_S | 1137 ID_S_EQ_R | ID_S_EQ_E | ID_S_EQ_S ); 1138 } 1139 1140 int 1141 linux_sys_getresuid(struct lwp *l, const struct linux_sys_getresuid_args *uap, register_t *retval) 1142 { 1143 /* { 1144 syscallarg(uid_t *) ruid; 1145 syscallarg(uid_t *) euid; 1146 syscallarg(uid_t *) suid; 1147 } */ 1148 kauth_cred_t pc = l->l_cred; 1149 int error; 1150 uid_t uid; 1151 1152 /* 1153 * Linux copies these values out to userspace like so: 1154 * 1155 * 1. Copy out ruid. 1156 * 2. If that succeeds, copy out euid. 1157 * 3. If both of those succeed, copy out suid. 1158 */ 1159 uid = kauth_cred_getuid(pc); 1160 if ((error = copyout(&uid, SCARG(uap, ruid), sizeof(uid_t))) != 0) 1161 return (error); 1162 1163 uid = kauth_cred_geteuid(pc); 1164 if ((error = copyout(&uid, SCARG(uap, euid), sizeof(uid_t))) != 0) 1165 return (error); 1166 1167 uid = kauth_cred_getsvuid(pc); 1168 1169 return (copyout(&uid, SCARG(uap, suid), sizeof(uid_t))); 1170 } 1171 1172 int 1173 linux_sys_ptrace(struct lwp *l, const struct linux_sys_ptrace_args *uap, register_t *retval) 1174 { 1175 /* { 1176 i386, m68k, powerpc: T=int 1177 alpha, amd64: T=long 1178 syscallarg(T) request; 1179 syscallarg(T) pid; 1180 syscallarg(T) addr; 1181 syscallarg(T) data; 1182 } */ 1183 const int *ptr; 1184 int request; 1185 int error; 1186 1187 ptr = linux_ptrace_request_map; 1188 request = SCARG(uap, request); 1189 while (*ptr != -1) 1190 if (*ptr++ == request) { 1191 struct sys_ptrace_args pta; 1192 1193 SCARG(&pta, req) = *ptr; 1194 SCARG(&pta, pid) = SCARG(uap, pid); 1195 SCARG(&pta, addr) = (void *)SCARG(uap, addr); 1196 SCARG(&pta, data) = SCARG(uap, data); 1197 1198 /* 1199 * Linux ptrace(PTRACE_CONT, pid, 0, 0) means actually 1200 * to continue where the process left off previously. 1201 * The same thing is achieved by addr == (void *) 1 1202 * on NetBSD, so rewrite 'addr' appropriately. 1203 */ 1204 if (request == LINUX_PTRACE_CONT && SCARG(uap, addr)==0) 1205 SCARG(&pta, addr) = (void *) 1; 1206 1207 error = sysent[SYS_ptrace].sy_call(l, &pta, retval); 1208 if (error) 1209 return error; 1210 switch (request) { 1211 case LINUX_PTRACE_PEEKTEXT: 1212 case LINUX_PTRACE_PEEKDATA: 1213 error = copyout (retval, 1214 (void *)SCARG(uap, data), 1215 sizeof *retval); 1216 *retval = SCARG(uap, data); 1217 break; 1218 default: 1219 break; 1220 } 1221 return error; 1222 } 1223 else 1224 ptr++; 1225 1226 return LINUX_SYS_PTRACE_ARCH(l, uap, retval); 1227 } 1228 1229 int 1230 linux_sys_reboot(struct lwp *l, const struct linux_sys_reboot_args *uap, register_t *retval) 1231 { 1232 /* { 1233 syscallarg(int) magic1; 1234 syscallarg(int) magic2; 1235 syscallarg(int) cmd; 1236 syscallarg(void *) arg; 1237 } */ 1238 struct sys_reboot_args /* { 1239 syscallarg(int) opt; 1240 syscallarg(char *) bootstr; 1241 } */ sra; 1242 int error; 1243 1244 if ((error = kauth_authorize_system(l->l_cred, 1245 KAUTH_SYSTEM_REBOOT, 0, NULL, NULL, NULL)) != 0) 1246 return(error); 1247 1248 if (SCARG(uap, magic1) != LINUX_REBOOT_MAGIC1) 1249 return(EINVAL); 1250 if (SCARG(uap, magic2) != LINUX_REBOOT_MAGIC2 && 1251 SCARG(uap, magic2) != LINUX_REBOOT_MAGIC2A && 1252 SCARG(uap, magic2) != LINUX_REBOOT_MAGIC2B) 1253 return(EINVAL); 1254 1255 switch ((unsigned long)SCARG(uap, cmd)) { 1256 case LINUX_REBOOT_CMD_RESTART: 1257 SCARG(&sra, opt) = RB_AUTOBOOT; 1258 break; 1259 case LINUX_REBOOT_CMD_HALT: 1260 SCARG(&sra, opt) = RB_HALT; 1261 break; 1262 case LINUX_REBOOT_CMD_POWER_OFF: 1263 SCARG(&sra, opt) = RB_HALT|RB_POWERDOWN; 1264 break; 1265 case LINUX_REBOOT_CMD_RESTART2: 1266 /* Reboot with an argument. */ 1267 SCARG(&sra, opt) = RB_AUTOBOOT|RB_STRING; 1268 SCARG(&sra, bootstr) = SCARG(uap, arg); 1269 break; 1270 case LINUX_REBOOT_CMD_CAD_ON: 1271 return(EINVAL); /* We don't implement ctrl-alt-delete */ 1272 case LINUX_REBOOT_CMD_CAD_OFF: 1273 return(0); 1274 default: 1275 return(EINVAL); 1276 } 1277 1278 return(sys_reboot(l, &sra, retval)); 1279 } 1280 1281 /* 1282 * Copy of compat_12_sys_swapon(). 1283 */ 1284 int 1285 linux_sys_swapon(struct lwp *l, const struct linux_sys_swapon_args *uap, register_t *retval) 1286 { 1287 /* { 1288 syscallarg(const char *) name; 1289 } */ 1290 struct sys_swapctl_args ua; 1291 1292 SCARG(&ua, cmd) = SWAP_ON; 1293 SCARG(&ua, arg) = (void *)__UNCONST(SCARG(uap, name)); 1294 SCARG(&ua, misc) = 0; /* priority */ 1295 return (sys_swapctl(l, &ua, retval)); 1296 } 1297 1298 /* 1299 * Stop swapping to the file or block device specified by path. 1300 */ 1301 int 1302 linux_sys_swapoff(struct lwp *l, const struct linux_sys_swapoff_args *uap, register_t *retval) 1303 { 1304 /* { 1305 syscallarg(const char *) path; 1306 } */ 1307 struct sys_swapctl_args ua; 1308 1309 SCARG(&ua, cmd) = SWAP_OFF; 1310 SCARG(&ua, arg) = __UNCONST(SCARG(uap, path)); /*XXXUNCONST*/ 1311 return (sys_swapctl(l, &ua, retval)); 1312 } 1313 1314 /* 1315 * Copy of compat_09_sys_setdomainname() 1316 */ 1317 /* ARGSUSED */ 1318 int 1319 linux_sys_setdomainname(struct lwp *l, const struct linux_sys_setdomainname_args *uap, register_t *retval) 1320 { 1321 /* { 1322 syscallarg(char *) domainname; 1323 syscallarg(int) len; 1324 } */ 1325 int name[2]; 1326 1327 name[0] = CTL_KERN; 1328 name[1] = KERN_DOMAINNAME; 1329 return (old_sysctl(&name[0], 2, 0, 0, SCARG(uap, domainname), 1330 SCARG(uap, len), l)); 1331 } 1332 1333 /* 1334 * sysinfo() 1335 */ 1336 /* ARGSUSED */ 1337 int 1338 linux_sys_sysinfo(struct lwp *l, const struct linux_sys_sysinfo_args *uap, register_t *retval) 1339 { 1340 /* { 1341 syscallarg(struct linux_sysinfo *) arg; 1342 } */ 1343 struct linux_sysinfo si; 1344 struct loadavg *la; 1345 1346 si.uptime = time_uptime; 1347 la = &averunnable; 1348 si.loads[0] = la->ldavg[0] * LINUX_SYSINFO_LOADS_SCALE / la->fscale; 1349 si.loads[1] = la->ldavg[1] * LINUX_SYSINFO_LOADS_SCALE / la->fscale; 1350 si.loads[2] = la->ldavg[2] * LINUX_SYSINFO_LOADS_SCALE / la->fscale; 1351 si.totalram = ctob((u_long)physmem); 1352 si.freeram = (u_long)uvmexp.free * uvmexp.pagesize; 1353 si.sharedram = 0; /* XXX */ 1354 si.bufferram = (u_long)uvmexp.filepages * uvmexp.pagesize; 1355 si.totalswap = (u_long)uvmexp.swpages * uvmexp.pagesize; 1356 si.freeswap = 1357 (u_long)(uvmexp.swpages - uvmexp.swpginuse) * uvmexp.pagesize; 1358 si.procs = nprocs; 1359 1360 /* The following are only present in newer Linux kernels. */ 1361 si.totalbig = 0; 1362 si.freebig = 0; 1363 si.mem_unit = 1; 1364 1365 return (copyout(&si, SCARG(uap, arg), sizeof si)); 1366 } 1367 1368 int 1369 linux_sys_getrlimit(struct lwp *l, const struct linux_sys_getrlimit_args *uap, register_t *retval) 1370 { 1371 /* { 1372 syscallarg(int) which; 1373 # ifdef LINUX_LARGEFILE64 1374 syscallarg(struct rlimit *) rlp; 1375 # else 1376 syscallarg(struct orlimit *) rlp; 1377 # endif 1378 } */ 1379 # ifdef LINUX_LARGEFILE64 1380 struct rlimit orl; 1381 # else 1382 struct orlimit orl; 1383 # endif 1384 int which; 1385 1386 which = linux_to_bsd_limit(SCARG(uap, which)); 1387 if (which < 0) 1388 return -which; 1389 1390 bsd_to_linux_rlimit(&orl, &l->l_proc->p_rlimit[which]); 1391 1392 return copyout(&orl, SCARG(uap, rlp), sizeof(orl)); 1393 } 1394 1395 int 1396 linux_sys_setrlimit(struct lwp *l, const struct linux_sys_setrlimit_args *uap, register_t *retval) 1397 { 1398 /* { 1399 syscallarg(int) which; 1400 # ifdef LINUX_LARGEFILE64 1401 syscallarg(struct rlimit *) rlp; 1402 # else 1403 syscallarg(struct orlimit *) rlp; 1404 # endif 1405 } */ 1406 struct rlimit rl; 1407 # ifdef LINUX_LARGEFILE64 1408 struct rlimit orl; 1409 # else 1410 struct orlimit orl; 1411 # endif 1412 int error; 1413 int which; 1414 1415 if ((error = copyin(SCARG(uap, rlp), &orl, sizeof(orl))) != 0) 1416 return error; 1417 1418 which = linux_to_bsd_limit(SCARG(uap, which)); 1419 if (which < 0) 1420 return -which; 1421 1422 linux_to_bsd_rlimit(&rl, &orl); 1423 return dosetrlimit(l, l->l_proc, which, &rl); 1424 } 1425 1426 # if !defined(__mips__) && !defined(__amd64__) 1427 /* XXX: this doesn't look 100% common, at least mips doesn't have it */ 1428 int 1429 linux_sys_ugetrlimit(struct lwp *l, const struct linux_sys_ugetrlimit_args *uap, register_t *retval) 1430 { 1431 return linux_sys_getrlimit(l, (const void *)uap, retval); 1432 } 1433 # endif 1434 1435 /* 1436 * This gets called for unsupported syscalls. The difference to sys_nosys() 1437 * is that process does not get SIGSYS, the call just returns with ENOSYS. 1438 * This is the way Linux does it and glibc depends on this behaviour. 1439 */ 1440 int 1441 linux_sys_nosys(struct lwp *l, const void *v, register_t *retval) 1442 { 1443 return (ENOSYS); 1444 } 1445 1446 int 1447 linux_sys_getpriority(struct lwp *l, const struct linux_sys_getpriority_args *uap, register_t *retval) 1448 { 1449 /* { 1450 syscallarg(int) which; 1451 syscallarg(int) who; 1452 } */ 1453 struct sys_getpriority_args bsa; 1454 int error; 1455 1456 SCARG(&bsa, which) = SCARG(uap, which); 1457 SCARG(&bsa, who) = SCARG(uap, who); 1458 1459 if ((error = sys_getpriority(l, &bsa, retval))) 1460 return error; 1461 1462 *retval = NZERO - *retval; 1463 1464 return 0; 1465 } 1466 1467 int 1468 linux_do_sys_utimensat(struct lwp *l, int fd, const char *path, struct timespec *tsp, int flags, register_t *retval) 1469 { 1470 int follow, error; 1471 1472 follow = (flags & LINUX_AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW; 1473 1474 if (path == NULL && fd != AT_FDCWD) { 1475 file_t *fp; 1476 1477 /* fd_getvnode() will use the descriptor for us */ 1478 if ((error = fd_getvnode(fd, &fp)) != 0) 1479 return error; 1480 error = do_sys_utimensat(l, AT_FDCWD, fp->f_data, NULL, 0, 1481 tsp, UIO_SYSSPACE); 1482 fd_putfile(fd); 1483 return error; 1484 } 1485 1486 return do_sys_utimensat(l, fd, NULL, path, follow, tsp, UIO_SYSSPACE); 1487 } 1488 1489 int 1490 linux_sys_utimensat(struct lwp *l, const struct linux_sys_utimensat_args *uap, 1491 register_t *retval) 1492 { 1493 /* { 1494 syscallarg(int) fd; 1495 syscallarg(const char *) path; 1496 syscallarg(const struct linux_timespec *) times; 1497 syscallarg(int) flag; 1498 } */ 1499 int error; 1500 struct linux_timespec lts[2]; 1501 struct timespec *tsp = NULL, ts[2]; 1502 1503 if (SCARG(uap, times)) { 1504 error = copyin(SCARG(uap, times), <s, sizeof(lts)); 1505 if (error != 0) 1506 return error; 1507 linux_to_native_timespec(&ts[0], <s[0]); 1508 linux_to_native_timespec(&ts[1], <s[1]); 1509 tsp = ts; 1510 } 1511 1512 return linux_do_sys_utimensat(l, SCARG(uap, fd), SCARG(uap, path), 1513 tsp, SCARG(uap, flag), retval); 1514 } 1515