1 /* $NetBSD: linux_misc.c,v 1.245 2019/09/20 15:25:19 kamil 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 1.245 2019/09/20 15:25:19 kamil 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!\n", 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 memset(&luts, 0, sizeof(luts)); 355 strlcpy(luts.l_sysname, linux_sysname, sizeof(luts.l_sysname)); 356 strlcpy(luts.l_nodename, hostname, sizeof(luts.l_nodename)); 357 strlcpy(luts.l_release, linux_release, sizeof(luts.l_release)); 358 strlcpy(luts.l_version, linux_version, sizeof(luts.l_version)); 359 strlcpy(luts.l_machine, LINUX_UNAME_ARCH, sizeof(luts.l_machine)); 360 strlcpy(luts.l_domainname, domainname, sizeof(luts.l_domainname)); 361 362 return copyout(&luts, SCARG(uap, up), sizeof(luts)); 363 } 364 365 /* Used directly on: alpha, mips, ppc, sparc, sparc64 */ 366 /* Used indirectly on: arm, i386, m68k */ 367 368 /* 369 * New type Linux mmap call. 370 * Only called directly on machines with >= 6 free regs. 371 */ 372 int 373 linux_sys_mmap(struct lwp *l, const struct linux_sys_mmap_args *uap, register_t *retval) 374 { 375 /* { 376 syscallarg(unsigned long) addr; 377 syscallarg(size_t) len; 378 syscallarg(int) prot; 379 syscallarg(int) flags; 380 syscallarg(int) fd; 381 syscallarg(linux_off_t) offset; 382 } */ 383 384 if (SCARG(uap, offset) & PAGE_MASK) 385 return EINVAL; 386 387 return linux_mmap(l, uap, retval, SCARG(uap, offset)); 388 } 389 390 /* 391 * Guts of most architectures' mmap64() implementations. This shares 392 * its list of arguments with linux_sys_mmap(). 393 * 394 * The difference in linux_sys_mmap2() is that "offset" is actually 395 * (offset / pagesize), not an absolute byte count. This translation 396 * to pagesize offsets is done inside glibc between the mmap64() call 397 * point, and the actual syscall. 398 */ 399 int 400 linux_sys_mmap2(struct lwp *l, const struct linux_sys_mmap2_args *uap, register_t *retval) 401 { 402 /* { 403 syscallarg(unsigned long) addr; 404 syscallarg(size_t) len; 405 syscallarg(int) prot; 406 syscallarg(int) flags; 407 syscallarg(int) fd; 408 syscallarg(linux_off_t) offset; 409 } */ 410 411 return linux_mmap(l, uap, retval, 412 ((off_t)SCARG(uap, offset)) << PAGE_SHIFT); 413 } 414 415 /* 416 * Massage arguments and call system mmap(2). 417 */ 418 static int 419 linux_mmap(struct lwp *l, const struct linux_sys_mmap_args *uap, register_t *retval, off_t offset) 420 { 421 struct sys_mmap_args cma; 422 int error; 423 size_t mmoff=0; 424 425 linux_to_bsd_mmap_args(&cma, uap); 426 SCARG(&cma, pos) = offset; 427 428 if (SCARG(uap, flags) & LINUX_MAP_GROWSDOWN) { 429 /* 430 * Request for stack-like memory segment. On linux, this 431 * works by mmap()ping (small) segment, which is automatically 432 * extended when page fault happens below the currently 433 * allocated area. We emulate this by allocating (typically 434 * bigger) segment sized at current stack size limit, and 435 * offsetting the requested and returned address accordingly. 436 * Since physical pages are only allocated on-demand, this 437 * is effectively identical. 438 */ 439 rlim_t ssl = l->l_proc->p_rlimit[RLIMIT_STACK].rlim_cur; 440 441 if (SCARG(&cma, len) < ssl) { 442 /* Compute the address offset */ 443 mmoff = round_page(ssl) - SCARG(uap, len); 444 445 if (SCARG(&cma, addr)) 446 SCARG(&cma, addr) = (char *)SCARG(&cma, addr) - mmoff; 447 448 SCARG(&cma, len) = (size_t) ssl; 449 } 450 } 451 452 error = sys_mmap(l, &cma, retval); 453 if (error) 454 return (error); 455 456 /* Shift the returned address for stack-like segment if necessary */ 457 retval[0] += mmoff; 458 459 return (0); 460 } 461 462 static void 463 linux_to_bsd_mmap_args(struct sys_mmap_args *cma, const struct linux_sys_mmap_args *uap) 464 { 465 int flags = MAP_TRYFIXED, fl = SCARG(uap, flags); 466 467 flags |= cvtto_bsd_mask(fl, LINUX_MAP_SHARED, MAP_SHARED); 468 flags |= cvtto_bsd_mask(fl, LINUX_MAP_PRIVATE, MAP_PRIVATE); 469 flags |= cvtto_bsd_mask(fl, LINUX_MAP_FIXED, MAP_FIXED); 470 flags |= cvtto_bsd_mask(fl, LINUX_MAP_ANON, MAP_ANON); 471 flags |= cvtto_bsd_mask(fl, LINUX_MAP_LOCKED, MAP_WIRED); 472 /* XXX XAX ERH: Any other flags here? There are more defined... */ 473 474 SCARG(cma, addr) = (void *)SCARG(uap, addr); 475 SCARG(cma, len) = SCARG(uap, len); 476 SCARG(cma, prot) = SCARG(uap, prot); 477 if (SCARG(cma, prot) & VM_PROT_WRITE) /* XXX */ 478 SCARG(cma, prot) |= VM_PROT_READ; 479 SCARG(cma, flags) = flags; 480 SCARG(cma, fd) = flags & MAP_ANON ? -1 : SCARG(uap, fd); 481 SCARG(cma, PAD) = 0; 482 } 483 484 #define LINUX_MREMAP_MAYMOVE 1 485 #define LINUX_MREMAP_FIXED 2 486 487 int 488 linux_sys_mremap(struct lwp *l, const struct linux_sys_mremap_args *uap, register_t *retval) 489 { 490 /* { 491 syscallarg(void *) old_address; 492 syscallarg(size_t) old_size; 493 syscallarg(size_t) new_size; 494 syscallarg(u_long) flags; 495 } */ 496 497 struct proc *p; 498 struct vm_map *map; 499 vaddr_t oldva; 500 vaddr_t newva; 501 size_t oldsize; 502 size_t newsize; 503 int flags; 504 int uvmflags; 505 int error; 506 507 flags = SCARG(uap, flags); 508 oldva = (vaddr_t)SCARG(uap, old_address); 509 oldsize = round_page(SCARG(uap, old_size)); 510 newsize = round_page(SCARG(uap, new_size)); 511 if ((flags & ~(LINUX_MREMAP_FIXED|LINUX_MREMAP_MAYMOVE)) != 0) { 512 error = EINVAL; 513 goto done; 514 } 515 if ((flags & LINUX_MREMAP_FIXED) != 0) { 516 if ((flags & LINUX_MREMAP_MAYMOVE) == 0) { 517 error = EINVAL; 518 goto done; 519 } 520 #if 0 /* notyet */ 521 newva = SCARG(uap, new_address); 522 uvmflags = MAP_FIXED; 523 #else /* notyet */ 524 error = EOPNOTSUPP; 525 goto done; 526 #endif /* notyet */ 527 } else if ((flags & LINUX_MREMAP_MAYMOVE) != 0) { 528 uvmflags = 0; 529 } else { 530 newva = oldva; 531 uvmflags = MAP_FIXED; 532 } 533 p = l->l_proc; 534 map = &p->p_vmspace->vm_map; 535 error = uvm_mremap(map, oldva, oldsize, map, &newva, newsize, p, 536 uvmflags); 537 538 done: 539 *retval = (error != 0) ? 0 : (register_t)newva; 540 return error; 541 } 542 543 #ifdef USRSTACK 544 int 545 linux_sys_mprotect(struct lwp *l, const struct linux_sys_mprotect_args *uap, register_t *retval) 546 { 547 /* { 548 syscallarg(const void *) start; 549 syscallarg(unsigned long) len; 550 syscallarg(int) prot; 551 } */ 552 struct vm_map_entry *entry; 553 struct vm_map *map; 554 struct proc *p; 555 vaddr_t end, start, len, stacklim; 556 int prot, grows; 557 558 start = (vaddr_t)SCARG(uap, start); 559 len = round_page(SCARG(uap, len)); 560 prot = SCARG(uap, prot); 561 grows = prot & (LINUX_PROT_GROWSDOWN | LINUX_PROT_GROWSUP); 562 prot &= ~grows; 563 end = start + len; 564 565 if (start & PAGE_MASK) 566 return EINVAL; 567 if (end < start) 568 return EINVAL; 569 if (end == start) 570 return 0; 571 572 if (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC)) 573 return EINVAL; 574 if (grows == (LINUX_PROT_GROWSDOWN | LINUX_PROT_GROWSUP)) 575 return EINVAL; 576 577 p = l->l_proc; 578 map = &p->p_vmspace->vm_map; 579 vm_map_lock(map); 580 # ifdef notdef 581 VM_MAP_RANGE_CHECK(map, start, end); 582 # endif 583 if (!uvm_map_lookup_entry(map, start, &entry) || entry->start > start) { 584 vm_map_unlock(map); 585 return ENOMEM; 586 } 587 588 /* 589 * Approximate the behaviour of PROT_GROWS{DOWN,UP}. 590 */ 591 592 stacklim = (vaddr_t)p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_cur; 593 if (grows & LINUX_PROT_GROWSDOWN) { 594 if (USRSTACK - stacklim <= start && start < USRSTACK) { 595 start = USRSTACK - stacklim; 596 } else { 597 start = entry->start; 598 } 599 } else if (grows & LINUX_PROT_GROWSUP) { 600 if (USRSTACK <= end && end < USRSTACK + stacklim) { 601 end = USRSTACK + stacklim; 602 } else { 603 end = entry->end; 604 } 605 } 606 vm_map_unlock(map); 607 return uvm_map_protect_user(l, start, end, prot); 608 } 609 #endif /* USRSTACK */ 610 611 /* 612 * This code is partly stolen from src/lib/libc/compat-43/times.c 613 */ 614 615 #define CONVTCK(r) (r.tv_sec * hz + r.tv_usec / (1000000 / hz)) 616 617 int 618 linux_sys_times(struct lwp *l, const struct linux_sys_times_args *uap, register_t *retval) 619 { 620 /* { 621 syscallarg(struct times *) tms; 622 } */ 623 struct proc *p = l->l_proc; 624 struct timeval t; 625 int error; 626 627 if (SCARG(uap, tms)) { 628 struct linux_tms ltms; 629 struct rusage ru; 630 631 mutex_enter(p->p_lock); 632 calcru(p, &ru.ru_utime, &ru.ru_stime, NULL, NULL); 633 ltms.ltms_utime = CONVTCK(ru.ru_utime); 634 ltms.ltms_stime = CONVTCK(ru.ru_stime); 635 ltms.ltms_cutime = CONVTCK(p->p_stats->p_cru.ru_utime); 636 ltms.ltms_cstime = CONVTCK(p->p_stats->p_cru.ru_stime); 637 mutex_exit(p->p_lock); 638 639 if ((error = copyout(<ms, SCARG(uap, tms), sizeof ltms))) 640 return error; 641 } 642 643 getmicrouptime(&t); 644 645 retval[0] = ((linux_clock_t)(CONVTCK(t))); 646 return 0; 647 } 648 649 #undef CONVTCK 650 651 /* 652 * Linux 'readdir' call. This code is mostly taken from the 653 * SunOS getdents call (see compat/sunos/sunos_misc.c), though 654 * an attempt has been made to keep it a little cleaner (failing 655 * miserably, because of the cruft needed if count 1 is passed). 656 * 657 * The d_off field should contain the offset of the next valid entry, 658 * but in Linux it has the offset of the entry itself. We emulate 659 * that bug here. 660 * 661 * Read in BSD-style entries, convert them, and copy them out. 662 * 663 * Note that this doesn't handle union-mounted filesystems. 664 */ 665 int 666 linux_sys_getdents(struct lwp *l, const struct linux_sys_getdents_args *uap, register_t *retval) 667 { 668 /* { 669 syscallarg(int) fd; 670 syscallarg(struct linux_dirent *) dent; 671 syscallarg(unsigned int) count; 672 } */ 673 struct dirent *bdp; 674 struct vnode *vp; 675 char *inp, *tbuf; /* BSD-format */ 676 int len, reclen; /* BSD-format */ 677 char *outp; /* Linux-format */ 678 int resid, linux_reclen = 0; /* Linux-format */ 679 struct file *fp; 680 struct uio auio; 681 struct iovec aiov; 682 struct linux_dirent idb; 683 off_t off; /* true file offset */ 684 int buflen, error, eofflag, nbytes, oldcall; 685 struct vattr va; 686 off_t *cookiebuf = NULL, *cookie; 687 int ncookies; 688 689 /* fd_getvnode() will use the descriptor for us */ 690 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 691 return (error); 692 693 if ((fp->f_flag & FREAD) == 0) { 694 error = EBADF; 695 goto out1; 696 } 697 698 vp = (struct vnode *)fp->f_data; 699 if (vp->v_type != VDIR) { 700 error = ENOTDIR; 701 goto out1; 702 } 703 704 vn_lock(vp, LK_SHARED | LK_RETRY); 705 error = VOP_GETATTR(vp, &va, l->l_cred); 706 VOP_UNLOCK(vp); 707 if (error) 708 goto out1; 709 710 nbytes = SCARG(uap, count); 711 if (nbytes == 1) { /* emulating old, broken behaviour */ 712 nbytes = sizeof (idb); 713 buflen = uimax(va.va_blocksize, nbytes); 714 oldcall = 1; 715 } else { 716 buflen = uimin(MAXBSIZE, nbytes); 717 if (buflen < va.va_blocksize) 718 buflen = va.va_blocksize; 719 oldcall = 0; 720 } 721 tbuf = malloc(buflen, M_TEMP, M_WAITOK); 722 723 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 724 off = fp->f_offset; 725 again: 726 aiov.iov_base = tbuf; 727 aiov.iov_len = buflen; 728 auio.uio_iov = &aiov; 729 auio.uio_iovcnt = 1; 730 auio.uio_rw = UIO_READ; 731 auio.uio_resid = buflen; 732 auio.uio_offset = off; 733 UIO_SETUP_SYSSPACE(&auio); 734 /* 735 * First we read into the malloc'ed buffer, then 736 * we massage it into user space, one record at a time. 737 */ 738 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, &cookiebuf, 739 &ncookies); 740 if (error) 741 goto out; 742 743 inp = tbuf; 744 outp = (void *)SCARG(uap, dent); 745 resid = nbytes; 746 if ((len = buflen - auio.uio_resid) == 0) 747 goto eof; 748 749 for (cookie = cookiebuf; len > 0; len -= reclen) { 750 bdp = (struct dirent *)inp; 751 reclen = bdp->d_reclen; 752 if (reclen & 3) { 753 error = EIO; 754 goto out; 755 } 756 if (bdp->d_fileno == 0) { 757 inp += reclen; /* it is a hole; squish it out */ 758 if (cookie) 759 off = *cookie++; 760 else 761 off += reclen; 762 continue; 763 } 764 linux_reclen = LINUX_RECLEN(&idb, bdp->d_namlen); 765 if (reclen > len || resid < linux_reclen) { 766 /* entry too big for buffer, so just stop */ 767 outp++; 768 break; 769 } 770 /* 771 * Massage in place to make a Linux-shaped dirent (otherwise 772 * we have to worry about touching user memory outside of 773 * the copyout() call). 774 */ 775 memset(&idb, 0, sizeof(idb)); 776 idb.d_ino = bdp->d_fileno; 777 /* 778 * The old readdir() call misuses the offset and reclen fields. 779 */ 780 if (oldcall) { 781 idb.d_off = (linux_off_t)linux_reclen; 782 idb.d_reclen = (u_short)bdp->d_namlen; 783 } else { 784 if (sizeof (idb.d_off) <= 4 && (off >> 32) != 0) { 785 compat_offseterr(vp, "linux_getdents"); 786 error = EINVAL; 787 goto out; 788 } 789 idb.d_off = (linux_off_t)off; 790 idb.d_reclen = (u_short)linux_reclen; 791 /* Linux puts d_type at the end of each record */ 792 *((char *)&idb + idb.d_reclen - 1) = bdp->d_type; 793 } 794 memcpy(idb.d_name, bdp->d_name, 795 MIN(sizeof(idb.d_name), bdp->d_namlen + 1)); 796 if ((error = copyout((void *)&idb, outp, linux_reclen))) 797 goto out; 798 /* advance past this real entry */ 799 inp += reclen; 800 if (cookie) 801 off = *cookie++; /* each entry points to itself */ 802 else 803 off += reclen; 804 /* advance output past Linux-shaped entry */ 805 outp += linux_reclen; 806 resid -= linux_reclen; 807 if (oldcall) 808 break; 809 } 810 811 /* if we squished out the whole block, try again */ 812 if (outp == (void *)SCARG(uap, dent)) { 813 if (cookiebuf) 814 free(cookiebuf, M_TEMP); 815 cookiebuf = NULL; 816 goto again; 817 } 818 fp->f_offset = off; /* update the vnode offset */ 819 820 if (oldcall) 821 nbytes = resid + linux_reclen; 822 823 eof: 824 *retval = nbytes - resid; 825 out: 826 VOP_UNLOCK(vp); 827 if (cookiebuf) 828 free(cookiebuf, M_TEMP); 829 free(tbuf, M_TEMP); 830 out1: 831 fd_putfile(SCARG(uap, fd)); 832 return error; 833 } 834 835 /* 836 * Even when just using registers to pass arguments to syscalls you can 837 * have 5 of them on the i386. So this newer version of select() does 838 * this. 839 */ 840 int 841 linux_sys_select(struct lwp *l, const struct linux_sys_select_args *uap, register_t *retval) 842 { 843 /* { 844 syscallarg(int) nfds; 845 syscallarg(fd_set *) readfds; 846 syscallarg(fd_set *) writefds; 847 syscallarg(fd_set *) exceptfds; 848 syscallarg(struct timeval50 *) timeout; 849 } */ 850 851 return linux_select1(l, retval, SCARG(uap, nfds), SCARG(uap, readfds), 852 SCARG(uap, writefds), SCARG(uap, exceptfds), 853 (struct linux_timeval *)SCARG(uap, timeout)); 854 } 855 856 /* 857 * Common code for the old and new versions of select(). A couple of 858 * things are important: 859 * 1) return the amount of time left in the 'timeout' parameter 860 * 2) select never returns ERESTART on Linux, always return EINTR 861 */ 862 int 863 linux_select1(struct lwp *l, register_t *retval, int nfds, fd_set *readfds, 864 fd_set *writefds, fd_set *exceptfds, struct linux_timeval *timeout) 865 { 866 struct timespec ts0, ts1, uts, *ts = NULL; 867 struct linux_timeval ltv; 868 int error; 869 870 /* 871 * Store current time for computation of the amount of 872 * time left. 873 */ 874 if (timeout) { 875 if ((error = copyin(timeout, <v, sizeof(ltv)))) 876 return error; 877 uts.tv_sec = ltv.tv_sec; 878 uts.tv_nsec = (long)((unsigned long)ltv.tv_usec * 1000); 879 if (itimespecfix(&uts)) { 880 /* 881 * The timeval was invalid. Convert it to something 882 * valid that will act as it does under Linux. 883 */ 884 uts.tv_sec += uts.tv_nsec / 1000000000; 885 uts.tv_nsec %= 1000000000; 886 if (uts.tv_nsec < 0) { 887 uts.tv_sec -= 1; 888 uts.tv_nsec += 1000000000; 889 } 890 if (uts.tv_sec < 0) 891 timespecclear(&uts); 892 } 893 ts = &uts; 894 nanotime(&ts0); 895 } 896 897 error = selcommon(retval, nfds, readfds, writefds, exceptfds, ts, NULL); 898 899 if (error) { 900 /* 901 * See fs/select.c in the Linux kernel. Without this, 902 * Maelstrom doesn't work. 903 */ 904 if (error == ERESTART) 905 error = EINTR; 906 return error; 907 } 908 909 if (timeout) { 910 if (*retval) { 911 /* 912 * Compute how much time was left of the timeout, 913 * by subtracting the current time and the time 914 * before we started the call, and subtracting 915 * that result from the user-supplied value. 916 */ 917 nanotime(&ts1); 918 timespecsub(&ts1, &ts0, &ts1); 919 timespecsub(&uts, &ts1, &uts); 920 if (uts.tv_sec < 0) 921 timespecclear(&uts); 922 } else 923 timespecclear(&uts); 924 ltv.tv_sec = uts.tv_sec; 925 ltv.tv_usec = uts.tv_nsec / 1000; 926 if ((error = copyout(<v, timeout, sizeof(ltv)))) 927 return error; 928 } 929 930 return 0; 931 } 932 933 /* 934 * Derived from FreeBSD's sys/compat/linux/linux_misc.c:linux_pselect6() 935 * which was contributed by Dmitry Chagin 936 * https://svnweb.freebsd.org/base?view=revision&revision=283403 937 */ 938 int 939 linux_sys_pselect6(struct lwp *l, 940 const struct linux_sys_pselect6_args *uap, register_t *retval) 941 { 942 /* { 943 syscallarg(int) nfds; 944 syscallarg(fd_set *) readfds; 945 syscallarg(fd_set *) writefds; 946 syscallarg(fd_set *) exceptfds; 947 syscallarg(struct timespec *) timeout; 948 syscallarg(linux_sized_sigset_t *) ss; 949 } */ 950 struct timespec uts, ts0, ts1, *tsp; 951 linux_sized_sigset_t lsss; 952 struct linux_timespec lts; 953 linux_sigset_t lss; 954 sigset_t *ssp; 955 sigset_t ss; 956 int error; 957 958 ssp = NULL; 959 if (SCARG(uap, ss) != NULL) { 960 if ((error = copyin(SCARG(uap, ss), &lsss, sizeof(lsss))) != 0) 961 return (error); 962 if (lsss.ss_len != sizeof(lss)) 963 return (EINVAL); 964 if (lsss.ss != NULL) { 965 if ((error = copyin(lsss.ss, &lss, sizeof(lss))) != 0) 966 return (error); 967 linux_to_native_sigset(&ss, &lss); 968 ssp = &ss; 969 } 970 } 971 972 if (SCARG(uap, timeout) != NULL) { 973 error = copyin(SCARG(uap, timeout), <s, sizeof(lts)); 974 if (error != 0) 975 return (error); 976 linux_to_native_timespec(&uts, <s); 977 978 if (itimespecfix(&uts)) 979 return (EINVAL); 980 981 nanotime(&ts0); 982 tsp = &uts; 983 } else { 984 tsp = NULL; 985 } 986 987 error = selcommon(retval, SCARG(uap, nfds), SCARG(uap, readfds), 988 SCARG(uap, writefds), SCARG(uap, exceptfds), tsp, ssp); 989 990 if (error == 0 && tsp != NULL) { 991 if (retval != 0) { 992 /* 993 * Compute how much time was left of the timeout, 994 * by subtracting the current time and the time 995 * before we started the call, and subtracting 996 * that result from the user-supplied value. 997 */ 998 nanotime(&ts1); 999 timespecsub(&ts1, &ts0, &ts1); 1000 timespecsub(&uts, &ts1, &uts); 1001 if (uts.tv_sec < 0) 1002 timespecclear(&uts); 1003 } else { 1004 timespecclear(&uts); 1005 } 1006 1007 native_to_linux_timespec(<s, &uts); 1008 error = copyout(<s, SCARG(uap, timeout), sizeof(lts)); 1009 } 1010 1011 return (error); 1012 } 1013 1014 int 1015 linux_sys_ppoll(struct lwp *l, 1016 const struct linux_sys_ppoll_args *uap, register_t *retval) 1017 { 1018 /* { 1019 syscallarg(struct pollfd *) fds; 1020 syscallarg(u_int) nfds; 1021 syscallarg(struct linux_timespec *) timeout; 1022 syscallarg(linux_sigset_t *) sigset; 1023 } */ 1024 struct linux_timespec lts0, *lts; 1025 struct timespec ts0, *ts = NULL; 1026 linux_sigset_t lsigmask0, *lsigmask; 1027 sigset_t sigmask0, *sigmask = NULL; 1028 int error; 1029 1030 lts = SCARG(uap, timeout); 1031 if (lts) { 1032 if ((error = copyin(lts, <s0, sizeof(lts0))) != 0) 1033 return error; 1034 linux_to_native_timespec(&ts0, <s0); 1035 ts = &ts0; 1036 } 1037 1038 lsigmask = SCARG(uap, sigset); 1039 if (lsigmask) { 1040 if ((error = copyin(lsigmask, &lsigmask0, sizeof(lsigmask0)))) 1041 return error; 1042 linux_to_native_sigset(&sigmask0, &lsigmask0); 1043 sigmask = &sigmask0; 1044 } 1045 1046 return pollcommon(retval, SCARG(uap, fds), SCARG(uap, nfds), 1047 ts, sigmask); 1048 } 1049 1050 /* 1051 * Set the 'personality' (emulation mode) for the current process. Only 1052 * accept the Linux personality here (0). This call is needed because 1053 * the Linux ELF crt0 issues it in an ugly kludge to make sure that 1054 * ELF binaries run in Linux mode, not SVR4 mode. 1055 */ 1056 int 1057 linux_sys_personality(struct lwp *l, const struct linux_sys_personality_args *uap, register_t *retval) 1058 { 1059 /* { 1060 syscallarg(unsigned long) per; 1061 } */ 1062 struct linux_emuldata *led; 1063 int per; 1064 1065 per = SCARG(uap, per); 1066 led = l->l_emuldata; 1067 if (per == LINUX_PER_QUERY) { 1068 retval[0] = led->led_personality; 1069 return 0; 1070 } 1071 1072 switch (per & LINUX_PER_MASK) { 1073 case LINUX_PER_LINUX: 1074 case LINUX_PER_LINUX32: 1075 led->led_personality = per; 1076 break; 1077 1078 default: 1079 return EINVAL; 1080 } 1081 1082 retval[0] = per; 1083 return 0; 1084 } 1085 1086 /* 1087 * We have nonexistent fsuid equal to uid. 1088 * If modification is requested, refuse. 1089 */ 1090 int 1091 linux_sys_setfsuid(struct lwp *l, const struct linux_sys_setfsuid_args *uap, register_t *retval) 1092 { 1093 /* { 1094 syscallarg(uid_t) uid; 1095 } */ 1096 uid_t uid; 1097 1098 uid = SCARG(uap, uid); 1099 if (kauth_cred_getuid(l->l_cred) != uid) 1100 return sys_nosys(l, uap, retval); 1101 1102 *retval = uid; 1103 return 0; 1104 } 1105 1106 int 1107 linux_sys_setfsgid(struct lwp *l, const struct linux_sys_setfsgid_args *uap, register_t *retval) 1108 { 1109 /* { 1110 syscallarg(gid_t) gid; 1111 } */ 1112 gid_t gid; 1113 1114 gid = SCARG(uap, gid); 1115 if (kauth_cred_getgid(l->l_cred) != gid) 1116 return sys_nosys(l, uap, retval); 1117 1118 *retval = gid; 1119 return 0; 1120 } 1121 1122 int 1123 linux_sys_setresuid(struct lwp *l, const struct linux_sys_setresuid_args *uap, register_t *retval) 1124 { 1125 /* { 1126 syscallarg(uid_t) ruid; 1127 syscallarg(uid_t) euid; 1128 syscallarg(uid_t) suid; 1129 } */ 1130 1131 /* 1132 * Note: These checks are a little different than the NetBSD 1133 * setreuid(2) call performs. This precisely follows the 1134 * behavior of the Linux kernel. 1135 */ 1136 1137 return do_setresuid(l, SCARG(uap, ruid), SCARG(uap, euid), 1138 SCARG(uap, suid), 1139 ID_R_EQ_R | ID_R_EQ_E | ID_R_EQ_S | 1140 ID_E_EQ_R | ID_E_EQ_E | ID_E_EQ_S | 1141 ID_S_EQ_R | ID_S_EQ_E | ID_S_EQ_S ); 1142 } 1143 1144 int 1145 linux_sys_getresuid(struct lwp *l, const struct linux_sys_getresuid_args *uap, register_t *retval) 1146 { 1147 /* { 1148 syscallarg(uid_t *) ruid; 1149 syscallarg(uid_t *) euid; 1150 syscallarg(uid_t *) suid; 1151 } */ 1152 kauth_cred_t pc = l->l_cred; 1153 int error; 1154 uid_t uid; 1155 1156 /* 1157 * Linux copies these values out to userspace like so: 1158 * 1159 * 1. Copy out ruid. 1160 * 2. If that succeeds, copy out euid. 1161 * 3. If both of those succeed, copy out suid. 1162 */ 1163 uid = kauth_cred_getuid(pc); 1164 if ((error = copyout(&uid, SCARG(uap, ruid), sizeof(uid_t))) != 0) 1165 return (error); 1166 1167 uid = kauth_cred_geteuid(pc); 1168 if ((error = copyout(&uid, SCARG(uap, euid), sizeof(uid_t))) != 0) 1169 return (error); 1170 1171 uid = kauth_cred_getsvuid(pc); 1172 1173 return (copyout(&uid, SCARG(uap, suid), sizeof(uid_t))); 1174 } 1175 1176 int 1177 linux_sys_ptrace(struct lwp *l, const struct linux_sys_ptrace_args *uap, register_t *retval) 1178 { 1179 /* { 1180 i386, m68k, powerpc: T=int 1181 alpha, amd64: T=long 1182 syscallarg(T) request; 1183 syscallarg(T) pid; 1184 syscallarg(T) addr; 1185 syscallarg(T) data; 1186 } */ 1187 const int *ptr; 1188 int request; 1189 int error; 1190 1191 ptr = linux_ptrace_request_map; 1192 request = SCARG(uap, request); 1193 while (*ptr != -1) 1194 if (*ptr++ == request) { 1195 struct sys_ptrace_args pta; 1196 1197 SCARG(&pta, req) = *ptr; 1198 SCARG(&pta, pid) = SCARG(uap, pid); 1199 SCARG(&pta, addr) = (void *)SCARG(uap, addr); 1200 SCARG(&pta, data) = SCARG(uap, data); 1201 1202 /* 1203 * Linux ptrace(PTRACE_CONT, pid, 0, 0) means actually 1204 * to continue where the process left off previously. 1205 * The same thing is achieved by addr == (void *) 1 1206 * on NetBSD, so rewrite 'addr' appropriately. 1207 */ 1208 if (request == LINUX_PTRACE_CONT && SCARG(uap, addr)==0) 1209 SCARG(&pta, addr) = (void *) 1; 1210 1211 error = sysent[SYS_ptrace].sy_call(l, &pta, retval); 1212 if (error) 1213 return error; 1214 switch (request) { 1215 case LINUX_PTRACE_PEEKTEXT: 1216 case LINUX_PTRACE_PEEKDATA: 1217 error = copyout (retval, 1218 (void *)SCARG(uap, data), 1219 sizeof *retval); 1220 *retval = SCARG(uap, data); 1221 break; 1222 default: 1223 break; 1224 } 1225 return error; 1226 } 1227 else 1228 ptr++; 1229 1230 return LINUX_SYS_PTRACE_ARCH(l, uap, retval); 1231 } 1232 1233 int 1234 linux_sys_reboot(struct lwp *l, const struct linux_sys_reboot_args *uap, register_t *retval) 1235 { 1236 /* { 1237 syscallarg(int) magic1; 1238 syscallarg(int) magic2; 1239 syscallarg(int) cmd; 1240 syscallarg(void *) arg; 1241 } */ 1242 struct sys_reboot_args /* { 1243 syscallarg(int) opt; 1244 syscallarg(char *) bootstr; 1245 } */ sra; 1246 int error; 1247 1248 if ((error = kauth_authorize_system(l->l_cred, 1249 KAUTH_SYSTEM_REBOOT, 0, NULL, NULL, NULL)) != 0) 1250 return(error); 1251 1252 if (SCARG(uap, magic1) != LINUX_REBOOT_MAGIC1) 1253 return(EINVAL); 1254 if (SCARG(uap, magic2) != LINUX_REBOOT_MAGIC2 && 1255 SCARG(uap, magic2) != LINUX_REBOOT_MAGIC2A && 1256 SCARG(uap, magic2) != LINUX_REBOOT_MAGIC2B) 1257 return(EINVAL); 1258 1259 switch ((unsigned long)SCARG(uap, cmd)) { 1260 case LINUX_REBOOT_CMD_RESTART: 1261 SCARG(&sra, opt) = RB_AUTOBOOT; 1262 break; 1263 case LINUX_REBOOT_CMD_HALT: 1264 SCARG(&sra, opt) = RB_HALT; 1265 break; 1266 case LINUX_REBOOT_CMD_POWER_OFF: 1267 SCARG(&sra, opt) = RB_HALT|RB_POWERDOWN; 1268 break; 1269 case LINUX_REBOOT_CMD_RESTART2: 1270 /* Reboot with an argument. */ 1271 SCARG(&sra, opt) = RB_AUTOBOOT|RB_STRING; 1272 SCARG(&sra, bootstr) = SCARG(uap, arg); 1273 break; 1274 case LINUX_REBOOT_CMD_CAD_ON: 1275 return(EINVAL); /* We don't implement ctrl-alt-delete */ 1276 case LINUX_REBOOT_CMD_CAD_OFF: 1277 return(0); 1278 default: 1279 return(EINVAL); 1280 } 1281 1282 return(sys_reboot(l, &sra, retval)); 1283 } 1284 1285 /* 1286 * Copy of compat_12_sys_swapon(). 1287 */ 1288 int 1289 linux_sys_swapon(struct lwp *l, const struct linux_sys_swapon_args *uap, register_t *retval) 1290 { 1291 /* { 1292 syscallarg(const char *) name; 1293 } */ 1294 struct sys_swapctl_args ua; 1295 1296 SCARG(&ua, cmd) = SWAP_ON; 1297 SCARG(&ua, arg) = (void *)__UNCONST(SCARG(uap, name)); 1298 SCARG(&ua, misc) = 0; /* priority */ 1299 return (sys_swapctl(l, &ua, retval)); 1300 } 1301 1302 /* 1303 * Stop swapping to the file or block device specified by path. 1304 */ 1305 int 1306 linux_sys_swapoff(struct lwp *l, const struct linux_sys_swapoff_args *uap, register_t *retval) 1307 { 1308 /* { 1309 syscallarg(const char *) path; 1310 } */ 1311 struct sys_swapctl_args ua; 1312 1313 SCARG(&ua, cmd) = SWAP_OFF; 1314 SCARG(&ua, arg) = __UNCONST(SCARG(uap, path)); /*XXXUNCONST*/ 1315 return (sys_swapctl(l, &ua, retval)); 1316 } 1317 1318 /* 1319 * Copy of compat_09_sys_setdomainname() 1320 */ 1321 /* ARGSUSED */ 1322 int 1323 linux_sys_setdomainname(struct lwp *l, const struct linux_sys_setdomainname_args *uap, register_t *retval) 1324 { 1325 /* { 1326 syscallarg(char *) domainname; 1327 syscallarg(int) len; 1328 } */ 1329 int name[2]; 1330 1331 name[0] = CTL_KERN; 1332 name[1] = KERN_DOMAINNAME; 1333 return (old_sysctl(&name[0], 2, 0, 0, SCARG(uap, domainname), 1334 SCARG(uap, len), l)); 1335 } 1336 1337 /* 1338 * sysinfo() 1339 */ 1340 /* ARGSUSED */ 1341 int 1342 linux_sys_sysinfo(struct lwp *l, const struct linux_sys_sysinfo_args *uap, register_t *retval) 1343 { 1344 /* { 1345 syscallarg(struct linux_sysinfo *) arg; 1346 } */ 1347 struct linux_sysinfo si; 1348 struct loadavg *la; 1349 1350 memset(&si, 0, sizeof(si)); 1351 si.uptime = time_uptime; 1352 la = &averunnable; 1353 si.loads[0] = la->ldavg[0] * LINUX_SYSINFO_LOADS_SCALE / la->fscale; 1354 si.loads[1] = la->ldavg[1] * LINUX_SYSINFO_LOADS_SCALE / la->fscale; 1355 si.loads[2] = la->ldavg[2] * LINUX_SYSINFO_LOADS_SCALE / la->fscale; 1356 si.totalram = ctob((u_long)physmem); 1357 si.freeram = (u_long)uvmexp.free * uvmexp.pagesize; 1358 si.sharedram = 0; /* XXX */ 1359 si.bufferram = (u_long)uvmexp.filepages * uvmexp.pagesize; 1360 si.totalswap = (u_long)uvmexp.swpages * uvmexp.pagesize; 1361 si.freeswap = 1362 (u_long)(uvmexp.swpages - uvmexp.swpginuse) * uvmexp.pagesize; 1363 si.procs = nprocs; 1364 1365 /* The following are only present in newer Linux kernels. */ 1366 si.totalbig = 0; 1367 si.freebig = 0; 1368 si.mem_unit = 1; 1369 1370 return (copyout(&si, SCARG(uap, arg), sizeof si)); 1371 } 1372 1373 int 1374 linux_sys_getrlimit(struct lwp *l, const struct linux_sys_getrlimit_args *uap, register_t *retval) 1375 { 1376 /* { 1377 syscallarg(int) which; 1378 # ifdef LINUX_LARGEFILE64 1379 syscallarg(struct rlimit *) rlp; 1380 # else 1381 syscallarg(struct orlimit *) rlp; 1382 # endif 1383 } */ 1384 # ifdef LINUX_LARGEFILE64 1385 struct rlimit orl; 1386 # else 1387 struct orlimit orl; 1388 # endif 1389 int which; 1390 1391 which = linux_to_bsd_limit(SCARG(uap, which)); 1392 if (which < 0) 1393 return -which; 1394 1395 bsd_to_linux_rlimit(&orl, &l->l_proc->p_rlimit[which]); 1396 1397 return copyout(&orl, SCARG(uap, rlp), sizeof(orl)); 1398 } 1399 1400 int 1401 linux_sys_setrlimit(struct lwp *l, const struct linux_sys_setrlimit_args *uap, register_t *retval) 1402 { 1403 /* { 1404 syscallarg(int) which; 1405 # ifdef LINUX_LARGEFILE64 1406 syscallarg(struct rlimit *) rlp; 1407 # else 1408 syscallarg(struct orlimit *) rlp; 1409 # endif 1410 } */ 1411 struct rlimit rl; 1412 # ifdef LINUX_LARGEFILE64 1413 struct rlimit orl; 1414 # else 1415 struct orlimit orl; 1416 # endif 1417 int error; 1418 int which; 1419 1420 if ((error = copyin(SCARG(uap, rlp), &orl, sizeof(orl))) != 0) 1421 return error; 1422 1423 which = linux_to_bsd_limit(SCARG(uap, which)); 1424 if (which < 0) 1425 return -which; 1426 1427 linux_to_bsd_rlimit(&rl, &orl); 1428 return dosetrlimit(l, l->l_proc, which, &rl); 1429 } 1430 1431 # if !defined(__mips__) && !defined(__amd64__) 1432 /* XXX: this doesn't look 100% common, at least mips doesn't have it */ 1433 int 1434 linux_sys_ugetrlimit(struct lwp *l, const struct linux_sys_ugetrlimit_args *uap, register_t *retval) 1435 { 1436 return linux_sys_getrlimit(l, (const void *)uap, retval); 1437 } 1438 # endif 1439 1440 /* 1441 * This gets called for unsupported syscalls. The difference to sys_nosys() 1442 * is that process does not get SIGSYS, the call just returns with ENOSYS. 1443 * This is the way Linux does it and glibc depends on this behaviour. 1444 */ 1445 int 1446 linux_sys_nosys(struct lwp *l, const void *v, register_t *retval) 1447 { 1448 return (ENOSYS); 1449 } 1450 1451 int 1452 linux_sys_getpriority(struct lwp *l, const struct linux_sys_getpriority_args *uap, register_t *retval) 1453 { 1454 /* { 1455 syscallarg(int) which; 1456 syscallarg(int) who; 1457 } */ 1458 struct sys_getpriority_args bsa; 1459 int error; 1460 1461 SCARG(&bsa, which) = SCARG(uap, which); 1462 SCARG(&bsa, who) = SCARG(uap, who); 1463 1464 if ((error = sys_getpriority(l, &bsa, retval))) 1465 return error; 1466 1467 *retval = NZERO - *retval; 1468 1469 return 0; 1470 } 1471 1472 int 1473 linux_do_sys_utimensat(struct lwp *l, int fd, const char *path, struct timespec *tsp, int flags, register_t *retval) 1474 { 1475 int follow, error; 1476 1477 follow = (flags & LINUX_AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW; 1478 1479 if (path == NULL && fd != AT_FDCWD) { 1480 file_t *fp; 1481 1482 /* fd_getvnode() will use the descriptor for us */ 1483 if ((error = fd_getvnode(fd, &fp)) != 0) 1484 return error; 1485 error = do_sys_utimensat(l, AT_FDCWD, fp->f_data, NULL, 0, 1486 tsp, UIO_SYSSPACE); 1487 fd_putfile(fd); 1488 return error; 1489 } 1490 1491 return do_sys_utimensat(l, fd, NULL, path, follow, tsp, UIO_SYSSPACE); 1492 } 1493 1494 int 1495 linux_sys_utimensat(struct lwp *l, const struct linux_sys_utimensat_args *uap, 1496 register_t *retval) 1497 { 1498 /* { 1499 syscallarg(int) fd; 1500 syscallarg(const char *) path; 1501 syscallarg(const struct linux_timespec *) times; 1502 syscallarg(int) flag; 1503 } */ 1504 int error; 1505 struct linux_timespec lts[2]; 1506 struct timespec *tsp = NULL, ts[2]; 1507 1508 if (SCARG(uap, times)) { 1509 error = copyin(SCARG(uap, times), <s, sizeof(lts)); 1510 if (error != 0) 1511 return error; 1512 linux_to_native_timespec(&ts[0], <s[0]); 1513 linux_to_native_timespec(&ts[1], <s[1]); 1514 tsp = ts; 1515 } 1516 1517 return linux_do_sys_utimensat(l, SCARG(uap, fd), SCARG(uap, path), 1518 tsp, SCARG(uap, flag), retval); 1519 } 1520