1 /* $NetBSD: linux_misc.c,v 1.220 2012/09/19 21:19:15 pooka 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 1.220 2012/09/19 21:19:15 pooka 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 #ifndef COMPAT_LINUX32 117 #include <compat/linux/common/linux_statfs.h> 118 #include <compat/linux/common/linux_limit.h> 119 #endif 120 #include <compat/linux/common/linux_ptrace.h> 121 #include <compat/linux/common/linux_reboot.h> 122 #include <compat/linux/common/linux_emuldata.h> 123 #include <compat/linux/common/linux_sched.h> 124 125 #include <compat/linux/linux_syscallargs.h> 126 127 #ifndef COMPAT_LINUX32 128 const int linux_ptrace_request_map[] = { 129 LINUX_PTRACE_TRACEME, PT_TRACE_ME, 130 LINUX_PTRACE_PEEKTEXT, PT_READ_I, 131 LINUX_PTRACE_PEEKDATA, PT_READ_D, 132 LINUX_PTRACE_POKETEXT, PT_WRITE_I, 133 LINUX_PTRACE_POKEDATA, PT_WRITE_D, 134 LINUX_PTRACE_CONT, PT_CONTINUE, 135 LINUX_PTRACE_KILL, PT_KILL, 136 LINUX_PTRACE_ATTACH, PT_ATTACH, 137 LINUX_PTRACE_DETACH, PT_DETACH, 138 # ifdef PT_STEP 139 LINUX_PTRACE_SINGLESTEP, PT_STEP, 140 # endif 141 LINUX_PTRACE_SYSCALL, PT_SYSCALL, 142 -1 143 }; 144 145 const struct linux_mnttypes linux_fstypes[] = { 146 { MOUNT_FFS, LINUX_DEFAULT_SUPER_MAGIC }, 147 { MOUNT_NFS, LINUX_NFS_SUPER_MAGIC }, 148 { MOUNT_MFS, LINUX_DEFAULT_SUPER_MAGIC }, 149 { MOUNT_MSDOS, LINUX_MSDOS_SUPER_MAGIC }, 150 { MOUNT_LFS, LINUX_DEFAULT_SUPER_MAGIC }, 151 { MOUNT_FDESC, LINUX_DEFAULT_SUPER_MAGIC }, 152 { MOUNT_NULL, LINUX_DEFAULT_SUPER_MAGIC }, 153 { MOUNT_OVERLAY, LINUX_DEFAULT_SUPER_MAGIC }, 154 { MOUNT_UMAP, LINUX_DEFAULT_SUPER_MAGIC }, 155 { MOUNT_KERNFS, LINUX_DEFAULT_SUPER_MAGIC }, 156 { MOUNT_PROCFS, LINUX_PROC_SUPER_MAGIC }, 157 { MOUNT_AFS, LINUX_DEFAULT_SUPER_MAGIC }, 158 { MOUNT_CD9660, LINUX_ISOFS_SUPER_MAGIC }, 159 { MOUNT_UNION, LINUX_DEFAULT_SUPER_MAGIC }, 160 { MOUNT_ADOSFS, LINUX_ADFS_SUPER_MAGIC }, 161 { MOUNT_EXT2FS, LINUX_EXT2_SUPER_MAGIC }, 162 { MOUNT_CFS, LINUX_DEFAULT_SUPER_MAGIC }, 163 { MOUNT_CODA, LINUX_CODA_SUPER_MAGIC }, 164 { MOUNT_FILECORE, LINUX_DEFAULT_SUPER_MAGIC }, 165 { MOUNT_NTFS, LINUX_DEFAULT_SUPER_MAGIC }, 166 { MOUNT_SMBFS, LINUX_SMB_SUPER_MAGIC }, 167 { MOUNT_PTYFS, LINUX_DEVPTS_SUPER_MAGIC }, 168 { MOUNT_TMPFS, LINUX_TMPFS_SUPER_MAGIC } 169 }; 170 const int linux_fstypes_cnt = sizeof(linux_fstypes) / sizeof(linux_fstypes[0]); 171 172 # ifdef DEBUG_LINUX 173 #define DPRINTF(a) uprintf a 174 # else 175 #define DPRINTF(a) 176 # endif 177 178 /* Local linux_misc.c functions: */ 179 static void linux_to_bsd_mmap_args(struct sys_mmap_args *, 180 const struct linux_sys_mmap_args *); 181 static int linux_mmap(struct lwp *, const struct linux_sys_mmap_args *, 182 register_t *, off_t); 183 184 185 /* 186 * The information on a terminated (or stopped) process needs 187 * to be converted in order for Linux binaries to get a valid signal 188 * number out of it. 189 */ 190 int 191 bsd_to_linux_wstat(int st) 192 { 193 194 int sig; 195 196 if (WIFSIGNALED(st)) { 197 sig = WTERMSIG(st); 198 if (sig >= 0 && sig < NSIG) 199 st= (st & ~0177) | native_to_linux_signo[sig]; 200 } else if (WIFSTOPPED(st)) { 201 sig = WSTOPSIG(st); 202 if (sig >= 0 && sig < NSIG) 203 st = (st & ~0xff00) | 204 (native_to_linux_signo[sig] << 8); 205 } 206 return st; 207 } 208 209 /* 210 * wait4(2). Passed on to the NetBSD call, surrounded by code to 211 * reserve some space for a NetBSD-style wait status, and converting 212 * it to what Linux wants. 213 */ 214 int 215 linux_sys_wait4(struct lwp *l, const struct linux_sys_wait4_args *uap, register_t *retval) 216 { 217 /* { 218 syscallarg(int) pid; 219 syscallarg(int *) status; 220 syscallarg(int) options; 221 syscallarg(struct rusage50 *) rusage; 222 } */ 223 int error, status, options, linux_options, pid = SCARG(uap, pid); 224 struct rusage50 ru50; 225 struct rusage ru; 226 proc_t *p; 227 228 linux_options = SCARG(uap, options); 229 options = WOPTSCHECKED; 230 if (linux_options & ~(LINUX_WAIT4_KNOWNFLAGS)) 231 return (EINVAL); 232 233 if (linux_options & LINUX_WAIT4_WNOHANG) 234 options |= WNOHANG; 235 if (linux_options & LINUX_WAIT4_WUNTRACED) 236 options |= WUNTRACED; 237 if (linux_options & LINUX_WAIT4_WALL) 238 options |= WALLSIG; 239 if (linux_options & LINUX_WAIT4_WCLONE) 240 options |= WALTSIG; 241 # ifdef DIAGNOSTIC 242 if (linux_options & LINUX_WAIT4_WNOTHREAD) 243 printf("WARNING: %s: linux process %d.%d called " 244 "waitpid with __WNOTHREAD set!", 245 __FILE__, l->l_proc->p_pid, l->l_lid); 246 247 # endif 248 249 error = do_sys_wait(&pid, &status, options, 250 SCARG(uap, rusage) != NULL ? &ru : NULL); 251 252 retval[0] = pid; 253 if (pid == 0) 254 return error; 255 256 p = curproc; 257 mutex_enter(p->p_lock); 258 sigdelset(&p->p_sigpend.sp_set, SIGCHLD); /* XXXAD ksiginfo leak */ 259 mutex_exit(p->p_lock); 260 261 if (SCARG(uap, rusage) != NULL) { 262 rusage_to_rusage50(&ru, &ru50); 263 error = copyout(&ru, SCARG(uap, rusage), sizeof(ru)); 264 } 265 266 if (error == 0 && SCARG(uap, status) != NULL) { 267 status = bsd_to_linux_wstat(status); 268 error = copyout(&status, SCARG(uap, status), sizeof status); 269 } 270 271 return error; 272 } 273 274 /* 275 * Linux brk(2). Like native, but always return the new break value. 276 */ 277 int 278 linux_sys_brk(struct lwp *l, const struct linux_sys_brk_args *uap, register_t *retval) 279 { 280 /* { 281 syscallarg(char *) nsize; 282 } */ 283 struct proc *p = l->l_proc; 284 struct vmspace *vm = p->p_vmspace; 285 struct sys_obreak_args oba; 286 287 SCARG(&oba, nsize) = SCARG(uap, nsize); 288 289 (void) sys_obreak(l, &oba, retval); 290 retval[0] = (register_t)((char *)vm->vm_daddr + ptoa(vm->vm_dsize)); 291 return 0; 292 } 293 294 /* 295 * Implement the fs stat functions. Straightforward. 296 */ 297 int 298 linux_sys_statfs(struct lwp *l, const struct linux_sys_statfs_args *uap, register_t *retval) 299 { 300 /* { 301 syscallarg(const char *) path; 302 syscallarg(struct linux_statfs *) sp; 303 } */ 304 struct statvfs *sb; 305 struct linux_statfs ltmp; 306 int error; 307 308 sb = STATVFSBUF_GET(); 309 error = do_sys_pstatvfs(l, SCARG(uap, path), ST_WAIT, sb); 310 if (error == 0) { 311 bsd_to_linux_statfs(sb, <mp); 312 error = copyout(<mp, SCARG(uap, sp), sizeof ltmp); 313 } 314 STATVFSBUF_PUT(sb); 315 316 return error; 317 } 318 319 int 320 linux_sys_fstatfs(struct lwp *l, const struct linux_sys_fstatfs_args *uap, register_t *retval) 321 { 322 /* { 323 syscallarg(int) fd; 324 syscallarg(struct linux_statfs *) sp; 325 } */ 326 struct statvfs *sb; 327 struct linux_statfs ltmp; 328 int error; 329 330 sb = STATVFSBUF_GET(); 331 error = do_sys_fstatvfs(l, SCARG(uap, fd), ST_WAIT, sb); 332 if (error == 0) { 333 bsd_to_linux_statfs(sb, <mp); 334 error = copyout(<mp, SCARG(uap, sp), sizeof ltmp); 335 } 336 STATVFSBUF_PUT(sb); 337 338 return error; 339 } 340 341 /* 342 * uname(). Just copy the info from the various strings stored in the 343 * kernel, and put it in the Linux utsname structure. That structure 344 * is almost the same as the NetBSD one, only it has fields 65 characters 345 * long, and an extra domainname field. 346 */ 347 int 348 linux_sys_uname(struct lwp *l, const struct linux_sys_uname_args *uap, register_t *retval) 349 { 350 /* { 351 syscallarg(struct linux_utsname *) up; 352 } */ 353 struct linux_utsname luts; 354 355 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 /* 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 int 543 linux_sys_mprotect(struct lwp *l, const struct linux_sys_mprotect_args *uap, register_t *retval) 544 { 545 /* { 546 syscallarg(const void *) start; 547 syscallarg(unsigned long) len; 548 syscallarg(int) prot; 549 } */ 550 struct vm_map_entry *entry; 551 struct vm_map *map; 552 struct proc *p; 553 vaddr_t end, start, len, stacklim; 554 int prot, grows; 555 556 start = (vaddr_t)SCARG(uap, start); 557 len = round_page(SCARG(uap, len)); 558 prot = SCARG(uap, prot); 559 grows = prot & (LINUX_PROT_GROWSDOWN | LINUX_PROT_GROWSUP); 560 prot &= ~grows; 561 end = start + len; 562 563 if (start & PAGE_MASK) 564 return EINVAL; 565 if (end < start) 566 return EINVAL; 567 if (end == start) 568 return 0; 569 570 if (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC)) 571 return EINVAL; 572 if (grows == (LINUX_PROT_GROWSDOWN | LINUX_PROT_GROWSUP)) 573 return EINVAL; 574 575 p = l->l_proc; 576 map = &p->p_vmspace->vm_map; 577 vm_map_lock(map); 578 # ifdef notdef 579 VM_MAP_RANGE_CHECK(map, start, end); 580 # endif 581 if (!uvm_map_lookup_entry(map, start, &entry) || entry->start > start) { 582 vm_map_unlock(map); 583 return ENOMEM; 584 } 585 586 /* 587 * Approximate the behaviour of PROT_GROWS{DOWN,UP}. 588 */ 589 590 stacklim = (vaddr_t)p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_cur; 591 if (grows & LINUX_PROT_GROWSDOWN) { 592 if (USRSTACK - stacklim <= start && start < USRSTACK) { 593 start = USRSTACK - stacklim; 594 } else { 595 start = entry->start; 596 } 597 } else if (grows & LINUX_PROT_GROWSUP) { 598 if (USRSTACK <= end && end < USRSTACK + stacklim) { 599 end = USRSTACK + stacklim; 600 } else { 601 end = entry->end; 602 } 603 } 604 vm_map_unlock(map); 605 return uvm_map_protect(map, start, end, prot, FALSE); 606 } 607 608 /* 609 * This code is partly stolen from src/lib/libc/compat-43/times.c 610 */ 611 612 #define CONVTCK(r) (r.tv_sec * hz + r.tv_usec / (1000000 / hz)) 613 614 int 615 linux_sys_times(struct lwp *l, const struct linux_sys_times_args *uap, register_t *retval) 616 { 617 /* { 618 syscallarg(struct times *) tms; 619 } */ 620 struct proc *p = l->l_proc; 621 struct timeval t; 622 int error; 623 624 if (SCARG(uap, tms)) { 625 struct linux_tms ltms; 626 struct rusage ru; 627 628 mutex_enter(p->p_lock); 629 calcru(p, &ru.ru_utime, &ru.ru_stime, NULL, NULL); 630 ltms.ltms_utime = CONVTCK(ru.ru_utime); 631 ltms.ltms_stime = CONVTCK(ru.ru_stime); 632 ltms.ltms_cutime = CONVTCK(p->p_stats->p_cru.ru_utime); 633 ltms.ltms_cstime = CONVTCK(p->p_stats->p_cru.ru_stime); 634 mutex_exit(p->p_lock); 635 636 if ((error = copyout(<ms, SCARG(uap, tms), sizeof ltms))) 637 return error; 638 } 639 640 getmicrouptime(&t); 641 642 retval[0] = ((linux_clock_t)(CONVTCK(t))); 643 return 0; 644 } 645 646 #undef CONVTCK 647 648 /* 649 * Linux 'readdir' call. This code is mostly taken from the 650 * SunOS getdents call (see compat/sunos/sunos_misc.c), though 651 * an attempt has been made to keep it a little cleaner (failing 652 * miserably, because of the cruft needed if count 1 is passed). 653 * 654 * The d_off field should contain the offset of the next valid entry, 655 * but in Linux it has the offset of the entry itself. We emulate 656 * that bug here. 657 * 658 * Read in BSD-style entries, convert them, and copy them out. 659 * 660 * Note that this doesn't handle union-mounted filesystems. 661 */ 662 int 663 linux_sys_getdents(struct lwp *l, const struct linux_sys_getdents_args *uap, register_t *retval) 664 { 665 /* { 666 syscallarg(int) fd; 667 syscallarg(struct linux_dirent *) dent; 668 syscallarg(unsigned int) count; 669 } */ 670 struct dirent *bdp; 671 struct vnode *vp; 672 char *inp, *tbuf; /* BSD-format */ 673 int len, reclen; /* BSD-format */ 674 char *outp; /* Linux-format */ 675 int resid, linux_reclen = 0; /* Linux-format */ 676 struct file *fp; 677 struct uio auio; 678 struct iovec aiov; 679 struct linux_dirent idb; 680 off_t off; /* true file offset */ 681 int buflen, error, eofflag, nbytes, oldcall; 682 struct vattr va; 683 off_t *cookiebuf = NULL, *cookie; 684 int ncookies; 685 686 /* fd_getvnode() will use the descriptor for us */ 687 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 688 return (error); 689 690 if ((fp->f_flag & FREAD) == 0) { 691 error = EBADF; 692 goto out1; 693 } 694 695 vp = (struct vnode *)fp->f_data; 696 if (vp->v_type != VDIR) { 697 error = ENOTDIR; 698 goto out1; 699 } 700 701 vn_lock(vp, LK_SHARED | LK_RETRY); 702 error = VOP_GETATTR(vp, &va, l->l_cred); 703 VOP_UNLOCK(vp); 704 if (error) 705 goto out1; 706 707 nbytes = SCARG(uap, count); 708 if (nbytes == 1) { /* emulating old, broken behaviour */ 709 nbytes = sizeof (idb); 710 buflen = max(va.va_blocksize, nbytes); 711 oldcall = 1; 712 } else { 713 buflen = min(MAXBSIZE, nbytes); 714 if (buflen < va.va_blocksize) 715 buflen = va.va_blocksize; 716 oldcall = 0; 717 } 718 tbuf = malloc(buflen, M_TEMP, M_WAITOK); 719 720 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 721 off = fp->f_offset; 722 again: 723 aiov.iov_base = tbuf; 724 aiov.iov_len = buflen; 725 auio.uio_iov = &aiov; 726 auio.uio_iovcnt = 1; 727 auio.uio_rw = UIO_READ; 728 auio.uio_resid = buflen; 729 auio.uio_offset = off; 730 UIO_SETUP_SYSSPACE(&auio); 731 /* 732 * First we read into the malloc'ed buffer, then 733 * we massage it into user space, one record at a time. 734 */ 735 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, &cookiebuf, 736 &ncookies); 737 if (error) 738 goto out; 739 740 inp = tbuf; 741 outp = (void *)SCARG(uap, dent); 742 resid = nbytes; 743 if ((len = buflen - auio.uio_resid) == 0) 744 goto eof; 745 746 for (cookie = cookiebuf; len > 0; len -= reclen) { 747 bdp = (struct dirent *)inp; 748 reclen = bdp->d_reclen; 749 if (reclen & 3) 750 panic("linux_readdir"); 751 if (bdp->d_fileno == 0) { 752 inp += reclen; /* it is a hole; squish it out */ 753 if (cookie) 754 off = *cookie++; 755 else 756 off += reclen; 757 continue; 758 } 759 linux_reclen = LINUX_RECLEN(&idb, bdp->d_namlen); 760 if (reclen > len || resid < linux_reclen) { 761 /* entry too big for buffer, so just stop */ 762 outp++; 763 break; 764 } 765 /* 766 * Massage in place to make a Linux-shaped dirent (otherwise 767 * we have to worry about touching user memory outside of 768 * the copyout() call). 769 */ 770 idb.d_ino = bdp->d_fileno; 771 /* 772 * The old readdir() call misuses the offset and reclen fields. 773 */ 774 if (oldcall) { 775 idb.d_off = (linux_off_t)linux_reclen; 776 idb.d_reclen = (u_short)bdp->d_namlen; 777 } else { 778 if (sizeof (idb.d_off) <= 4 && (off >> 32) != 0) { 779 compat_offseterr(vp, "linux_getdents"); 780 error = EINVAL; 781 goto out; 782 } 783 idb.d_off = (linux_off_t)off; 784 idb.d_reclen = (u_short)linux_reclen; 785 } 786 strcpy(idb.d_name, bdp->d_name); 787 idb.d_name[strlen(idb.d_name) + 1] = bdp->d_type; 788 if ((error = copyout((void *)&idb, outp, linux_reclen))) 789 goto out; 790 /* advance past this real entry */ 791 inp += reclen; 792 if (cookie) 793 off = *cookie++; /* each entry points to itself */ 794 else 795 off += reclen; 796 /* advance output past Linux-shaped entry */ 797 outp += linux_reclen; 798 resid -= linux_reclen; 799 if (oldcall) 800 break; 801 } 802 803 /* if we squished out the whole block, try again */ 804 if (outp == (void *)SCARG(uap, dent)) { 805 if (cookiebuf) 806 free(cookiebuf, M_TEMP); 807 cookiebuf = NULL; 808 goto again; 809 } 810 fp->f_offset = off; /* update the vnode offset */ 811 812 if (oldcall) 813 nbytes = resid + linux_reclen; 814 815 eof: 816 *retval = nbytes - resid; 817 out: 818 VOP_UNLOCK(vp); 819 if (cookiebuf) 820 free(cookiebuf, M_TEMP); 821 free(tbuf, M_TEMP); 822 out1: 823 fd_putfile(SCARG(uap, fd)); 824 return error; 825 } 826 827 /* 828 * Even when just using registers to pass arguments to syscalls you can 829 * have 5 of them on the i386. So this newer version of select() does 830 * this. 831 */ 832 int 833 linux_sys_select(struct lwp *l, const struct linux_sys_select_args *uap, register_t *retval) 834 { 835 /* { 836 syscallarg(int) nfds; 837 syscallarg(fd_set *) readfds; 838 syscallarg(fd_set *) writefds; 839 syscallarg(fd_set *) exceptfds; 840 syscallarg(struct timeval50 *) timeout; 841 } */ 842 843 return linux_select1(l, retval, SCARG(uap, nfds), SCARG(uap, readfds), 844 SCARG(uap, writefds), SCARG(uap, exceptfds), 845 (struct linux_timeval *)SCARG(uap, timeout)); 846 } 847 848 /* 849 * Common code for the old and new versions of select(). A couple of 850 * things are important: 851 * 1) return the amount of time left in the 'timeout' parameter 852 * 2) select never returns ERESTART on Linux, always return EINTR 853 */ 854 int 855 linux_select1(struct lwp *l, register_t *retval, int nfds, fd_set *readfds, 856 fd_set *writefds, fd_set *exceptfds, struct linux_timeval *timeout) 857 { 858 struct timespec ts0, ts1, uts, *ts = NULL; 859 struct linux_timeval ltv; 860 int error; 861 862 /* 863 * Store current time for computation of the amount of 864 * time left. 865 */ 866 if (timeout) { 867 if ((error = copyin(timeout, <v, sizeof(ltv)))) 868 return error; 869 uts.tv_sec = ltv.tv_sec; 870 uts.tv_nsec = ltv.tv_usec * 1000; 871 if (itimespecfix(&uts)) { 872 /* 873 * The timeval was invalid. Convert it to something 874 * valid that will act as it does under Linux. 875 */ 876 uts.tv_sec += uts.tv_nsec / 1000000000; 877 uts.tv_nsec %= 1000000000; 878 if (uts.tv_nsec < 0) { 879 uts.tv_sec -= 1; 880 uts.tv_nsec += 1000000000; 881 } 882 if (uts.tv_sec < 0) 883 timespecclear(&uts); 884 } 885 ts = &uts; 886 nanotime(&ts0); 887 } 888 889 error = selcommon(retval, nfds, readfds, writefds, exceptfds, ts, NULL); 890 891 if (error) { 892 /* 893 * See fs/select.c in the Linux kernel. Without this, 894 * Maelstrom doesn't work. 895 */ 896 if (error == ERESTART) 897 error = EINTR; 898 return error; 899 } 900 901 if (timeout) { 902 if (*retval) { 903 /* 904 * Compute how much time was left of the timeout, 905 * by subtracting the current time and the time 906 * before we started the call, and subtracting 907 * that result from the user-supplied value. 908 */ 909 nanotime(&ts1); 910 timespecsub(&ts1, &ts0, &ts1); 911 timespecsub(&uts, &ts1, &uts); 912 if (uts.tv_sec < 0) 913 timespecclear(&uts); 914 } else 915 timespecclear(&uts); 916 ltv.tv_sec = uts.tv_sec; 917 ltv.tv_usec = uts.tv_nsec / 1000; 918 if ((error = copyout(<v, timeout, sizeof(ltv)))) 919 return error; 920 } 921 922 return 0; 923 } 924 925 int 926 linux_sys_ppoll(struct lwp *l, 927 const struct linux_sys_ppoll_args *uap, register_t *retval) 928 { 929 /* { 930 syscallarg(struct pollfd *) fds; 931 syscallarg(int) nfds; 932 syscallarg(struct linux_timespec *) timeout; 933 syscallarg(linux_sigset_t *) sigset; 934 } */ 935 struct linux_timespec lts0, *lts; 936 struct timespec ts0, *ts = NULL; 937 linux_sigset_t lsigmask0, *lsigmask; 938 sigset_t sigmask0, *sigmask = NULL; 939 int error; 940 941 lts = SCARG(uap, timeout); 942 if (lts) { 943 if ((error = copyin(lts, <s0, sizeof(lts0))) != 0) 944 return error; 945 linux_to_native_timespec(&ts0, <s0); 946 ts = &ts0; 947 } 948 949 lsigmask = SCARG(uap, sigset); 950 if (lsigmask) { 951 if ((error = copyin(lsigmask, &lsigmask0, sizeof(lsigmask0)))) 952 return error; 953 linux_to_native_sigset(&sigmask0, &lsigmask0); 954 sigmask = &sigmask0; 955 } 956 957 return pollcommon(retval, SCARG(uap, fds), SCARG(uap, nfds), 958 ts, sigmask); 959 } 960 961 /* 962 * Set the 'personality' (emulation mode) for the current process. Only 963 * accept the Linux personality here (0). This call is needed because 964 * the Linux ELF crt0 issues it in an ugly kludge to make sure that 965 * ELF binaries run in Linux mode, not SVR4 mode. 966 */ 967 int 968 linux_sys_personality(struct lwp *l, const struct linux_sys_personality_args *uap, register_t *retval) 969 { 970 /* { 971 syscallarg(unsigned long) per; 972 } */ 973 struct linux_emuldata *led; 974 int per; 975 976 per = SCARG(uap, per); 977 led = l->l_emuldata; 978 if (per == LINUX_PER_QUERY) { 979 retval[0] = led->led_personality; 980 return 0; 981 } 982 983 switch (per & LINUX_PER_MASK) { 984 case LINUX_PER_LINUX: 985 case LINUX_PER_LINUX32: 986 led->led_personality = per; 987 break; 988 989 default: 990 return EINVAL; 991 } 992 993 retval[0] = per; 994 return 0; 995 } 996 997 /* 998 * We have nonexistent fsuid equal to uid. 999 * If modification is requested, refuse. 1000 */ 1001 int 1002 linux_sys_setfsuid(struct lwp *l, const struct linux_sys_setfsuid_args *uap, register_t *retval) 1003 { 1004 /* { 1005 syscallarg(uid_t) uid; 1006 } */ 1007 uid_t uid; 1008 1009 uid = SCARG(uap, uid); 1010 if (kauth_cred_getuid(l->l_cred) != uid) 1011 return sys_nosys(l, uap, retval); 1012 1013 *retval = uid; 1014 return 0; 1015 } 1016 1017 int 1018 linux_sys_setfsgid(struct lwp *l, const struct linux_sys_setfsgid_args *uap, register_t *retval) 1019 { 1020 /* { 1021 syscallarg(gid_t) gid; 1022 } */ 1023 gid_t gid; 1024 1025 gid = SCARG(uap, gid); 1026 if (kauth_cred_getgid(l->l_cred) != gid) 1027 return sys_nosys(l, uap, retval); 1028 1029 *retval = gid; 1030 return 0; 1031 } 1032 1033 int 1034 linux_sys_setresuid(struct lwp *l, const struct linux_sys_setresuid_args *uap, register_t *retval) 1035 { 1036 /* { 1037 syscallarg(uid_t) ruid; 1038 syscallarg(uid_t) euid; 1039 syscallarg(uid_t) suid; 1040 } */ 1041 1042 /* 1043 * Note: These checks are a little different than the NetBSD 1044 * setreuid(2) call performs. This precisely follows the 1045 * behavior of the Linux kernel. 1046 */ 1047 1048 return do_setresuid(l, SCARG(uap, ruid), SCARG(uap, euid), 1049 SCARG(uap, suid), 1050 ID_R_EQ_R | ID_R_EQ_E | ID_R_EQ_S | 1051 ID_E_EQ_R | ID_E_EQ_E | ID_E_EQ_S | 1052 ID_S_EQ_R | ID_S_EQ_E | ID_S_EQ_S ); 1053 } 1054 1055 int 1056 linux_sys_getresuid(struct lwp *l, const struct linux_sys_getresuid_args *uap, register_t *retval) 1057 { 1058 /* { 1059 syscallarg(uid_t *) ruid; 1060 syscallarg(uid_t *) euid; 1061 syscallarg(uid_t *) suid; 1062 } */ 1063 kauth_cred_t pc = l->l_cred; 1064 int error; 1065 uid_t uid; 1066 1067 /* 1068 * Linux copies these values out to userspace like so: 1069 * 1070 * 1. Copy out ruid. 1071 * 2. If that succeeds, copy out euid. 1072 * 3. If both of those succeed, copy out suid. 1073 */ 1074 uid = kauth_cred_getuid(pc); 1075 if ((error = copyout(&uid, SCARG(uap, ruid), sizeof(uid_t))) != 0) 1076 return (error); 1077 1078 uid = kauth_cred_geteuid(pc); 1079 if ((error = copyout(&uid, SCARG(uap, euid), sizeof(uid_t))) != 0) 1080 return (error); 1081 1082 uid = kauth_cred_getsvuid(pc); 1083 1084 return (copyout(&uid, SCARG(uap, suid), sizeof(uid_t))); 1085 } 1086 1087 int 1088 linux_sys_ptrace(struct lwp *l, const struct linux_sys_ptrace_args *uap, register_t *retval) 1089 { 1090 /* { 1091 i386, m68k, powerpc: T=int 1092 alpha, amd64: T=long 1093 syscallarg(T) request; 1094 syscallarg(T) pid; 1095 syscallarg(T) addr; 1096 syscallarg(T) data; 1097 } */ 1098 const int *ptr; 1099 int request; 1100 int error; 1101 1102 ptr = linux_ptrace_request_map; 1103 request = SCARG(uap, request); 1104 while (*ptr != -1) 1105 if (*ptr++ == request) { 1106 struct sys_ptrace_args pta; 1107 1108 SCARG(&pta, req) = *ptr; 1109 SCARG(&pta, pid) = SCARG(uap, pid); 1110 SCARG(&pta, addr) = (void *)SCARG(uap, addr); 1111 SCARG(&pta, data) = SCARG(uap, data); 1112 1113 /* 1114 * Linux ptrace(PTRACE_CONT, pid, 0, 0) means actually 1115 * to continue where the process left off previously. 1116 * The same thing is achieved by addr == (void *) 1 1117 * on NetBSD, so rewrite 'addr' appropriately. 1118 */ 1119 if (request == LINUX_PTRACE_CONT && SCARG(uap, addr)==0) 1120 SCARG(&pta, addr) = (void *) 1; 1121 1122 error = sysent[SYS_ptrace].sy_call(l, &pta, retval); 1123 if (error) 1124 return error; 1125 switch (request) { 1126 case LINUX_PTRACE_PEEKTEXT: 1127 case LINUX_PTRACE_PEEKDATA: 1128 error = copyout (retval, 1129 (void *)SCARG(uap, data), 1130 sizeof *retval); 1131 *retval = SCARG(uap, data); 1132 break; 1133 default: 1134 break; 1135 } 1136 return error; 1137 } 1138 else 1139 ptr++; 1140 1141 return LINUX_SYS_PTRACE_ARCH(l, uap, retval); 1142 } 1143 1144 int 1145 linux_sys_reboot(struct lwp *l, const struct linux_sys_reboot_args *uap, register_t *retval) 1146 { 1147 /* { 1148 syscallarg(int) magic1; 1149 syscallarg(int) magic2; 1150 syscallarg(int) cmd; 1151 syscallarg(void *) arg; 1152 } */ 1153 struct sys_reboot_args /* { 1154 syscallarg(int) opt; 1155 syscallarg(char *) bootstr; 1156 } */ sra; 1157 int error; 1158 1159 if ((error = kauth_authorize_system(l->l_cred, 1160 KAUTH_SYSTEM_REBOOT, 0, NULL, NULL, NULL)) != 0) 1161 return(error); 1162 1163 if (SCARG(uap, magic1) != LINUX_REBOOT_MAGIC1) 1164 return(EINVAL); 1165 if (SCARG(uap, magic2) != LINUX_REBOOT_MAGIC2 && 1166 SCARG(uap, magic2) != LINUX_REBOOT_MAGIC2A && 1167 SCARG(uap, magic2) != LINUX_REBOOT_MAGIC2B) 1168 return(EINVAL); 1169 1170 switch ((unsigned long)SCARG(uap, cmd)) { 1171 case LINUX_REBOOT_CMD_RESTART: 1172 SCARG(&sra, opt) = RB_AUTOBOOT; 1173 break; 1174 case LINUX_REBOOT_CMD_HALT: 1175 SCARG(&sra, opt) = RB_HALT; 1176 break; 1177 case LINUX_REBOOT_CMD_POWER_OFF: 1178 SCARG(&sra, opt) = RB_HALT|RB_POWERDOWN; 1179 break; 1180 case LINUX_REBOOT_CMD_RESTART2: 1181 /* Reboot with an argument. */ 1182 SCARG(&sra, opt) = RB_AUTOBOOT|RB_STRING; 1183 SCARG(&sra, bootstr) = SCARG(uap, arg); 1184 break; 1185 case LINUX_REBOOT_CMD_CAD_ON: 1186 return(EINVAL); /* We don't implement ctrl-alt-delete */ 1187 case LINUX_REBOOT_CMD_CAD_OFF: 1188 return(0); 1189 default: 1190 return(EINVAL); 1191 } 1192 1193 return(sys_reboot(l, &sra, retval)); 1194 } 1195 1196 /* 1197 * Copy of compat_12_sys_swapon(). 1198 */ 1199 int 1200 linux_sys_swapon(struct lwp *l, const struct linux_sys_swapon_args *uap, register_t *retval) 1201 { 1202 /* { 1203 syscallarg(const char *) name; 1204 } */ 1205 struct sys_swapctl_args ua; 1206 1207 SCARG(&ua, cmd) = SWAP_ON; 1208 SCARG(&ua, arg) = (void *)__UNCONST(SCARG(uap, name)); 1209 SCARG(&ua, misc) = 0; /* priority */ 1210 return (sys_swapctl(l, &ua, retval)); 1211 } 1212 1213 /* 1214 * Stop swapping to the file or block device specified by path. 1215 */ 1216 int 1217 linux_sys_swapoff(struct lwp *l, const struct linux_sys_swapoff_args *uap, register_t *retval) 1218 { 1219 /* { 1220 syscallarg(const char *) path; 1221 } */ 1222 struct sys_swapctl_args ua; 1223 1224 SCARG(&ua, cmd) = SWAP_OFF; 1225 SCARG(&ua, arg) = __UNCONST(SCARG(uap, path)); /*XXXUNCONST*/ 1226 return (sys_swapctl(l, &ua, retval)); 1227 } 1228 1229 /* 1230 * Copy of compat_09_sys_setdomainname() 1231 */ 1232 /* ARGSUSED */ 1233 int 1234 linux_sys_setdomainname(struct lwp *l, const struct linux_sys_setdomainname_args *uap, register_t *retval) 1235 { 1236 /* { 1237 syscallarg(char *) domainname; 1238 syscallarg(int) len; 1239 } */ 1240 int name[2]; 1241 1242 name[0] = CTL_KERN; 1243 name[1] = KERN_DOMAINNAME; 1244 return (old_sysctl(&name[0], 2, 0, 0, SCARG(uap, domainname), 1245 SCARG(uap, len), l)); 1246 } 1247 1248 /* 1249 * sysinfo() 1250 */ 1251 /* ARGSUSED */ 1252 int 1253 linux_sys_sysinfo(struct lwp *l, const struct linux_sys_sysinfo_args *uap, register_t *retval) 1254 { 1255 /* { 1256 syscallarg(struct linux_sysinfo *) arg; 1257 } */ 1258 struct linux_sysinfo si; 1259 struct loadavg *la; 1260 1261 si.uptime = time_uptime; 1262 la = &averunnable; 1263 si.loads[0] = la->ldavg[0] * LINUX_SYSINFO_LOADS_SCALE / la->fscale; 1264 si.loads[1] = la->ldavg[1] * LINUX_SYSINFO_LOADS_SCALE / la->fscale; 1265 si.loads[2] = la->ldavg[2] * LINUX_SYSINFO_LOADS_SCALE / la->fscale; 1266 si.totalram = ctob((u_long)physmem); 1267 si.freeram = (u_long)uvmexp.free * uvmexp.pagesize; 1268 si.sharedram = 0; /* XXX */ 1269 si.bufferram = (u_long)uvmexp.filepages * uvmexp.pagesize; 1270 si.totalswap = (u_long)uvmexp.swpages * uvmexp.pagesize; 1271 si.freeswap = 1272 (u_long)(uvmexp.swpages - uvmexp.swpginuse) * uvmexp.pagesize; 1273 si.procs = nprocs; 1274 1275 /* The following are only present in newer Linux kernels. */ 1276 si.totalbig = 0; 1277 si.freebig = 0; 1278 si.mem_unit = 1; 1279 1280 return (copyout(&si, SCARG(uap, arg), sizeof si)); 1281 } 1282 1283 int 1284 linux_sys_getrlimit(struct lwp *l, const struct linux_sys_getrlimit_args *uap, register_t *retval) 1285 { 1286 /* { 1287 syscallarg(int) which; 1288 # ifdef LINUX_LARGEFILE64 1289 syscallarg(struct rlimit *) rlp; 1290 # else 1291 syscallarg(struct orlimit *) rlp; 1292 # endif 1293 } */ 1294 # ifdef LINUX_LARGEFILE64 1295 struct rlimit orl; 1296 # else 1297 struct orlimit orl; 1298 # endif 1299 int which; 1300 1301 which = linux_to_bsd_limit(SCARG(uap, which)); 1302 if (which < 0) 1303 return -which; 1304 1305 bsd_to_linux_rlimit(&orl, &l->l_proc->p_rlimit[which]); 1306 1307 return copyout(&orl, SCARG(uap, rlp), sizeof(orl)); 1308 } 1309 1310 int 1311 linux_sys_setrlimit(struct lwp *l, const struct linux_sys_setrlimit_args *uap, register_t *retval) 1312 { 1313 /* { 1314 syscallarg(int) which; 1315 # ifdef LINUX_LARGEFILE64 1316 syscallarg(struct rlimit *) rlp; 1317 # else 1318 syscallarg(struct orlimit *) rlp; 1319 # endif 1320 } */ 1321 struct rlimit rl; 1322 # ifdef LINUX_LARGEFILE64 1323 struct rlimit orl; 1324 # else 1325 struct orlimit orl; 1326 # endif 1327 int error; 1328 int which; 1329 1330 if ((error = copyin(SCARG(uap, rlp), &orl, sizeof(orl))) != 0) 1331 return error; 1332 1333 which = linux_to_bsd_limit(SCARG(uap, which)); 1334 if (which < 0) 1335 return -which; 1336 1337 linux_to_bsd_rlimit(&rl, &orl); 1338 return dosetrlimit(l, l->l_proc, which, &rl); 1339 } 1340 1341 # if !defined(__mips__) && !defined(__amd64__) 1342 /* XXX: this doesn't look 100% common, at least mips doesn't have it */ 1343 int 1344 linux_sys_ugetrlimit(struct lwp *l, const struct linux_sys_ugetrlimit_args *uap, register_t *retval) 1345 { 1346 return linux_sys_getrlimit(l, (const void *)uap, retval); 1347 } 1348 # endif 1349 1350 /* 1351 * This gets called for unsupported syscalls. The difference to sys_nosys() 1352 * is that process does not get SIGSYS, the call just returns with ENOSYS. 1353 * This is the way Linux does it and glibc depends on this behaviour. 1354 */ 1355 int 1356 linux_sys_nosys(struct lwp *l, const void *v, register_t *retval) 1357 { 1358 return (ENOSYS); 1359 } 1360 1361 int 1362 linux_sys_getpriority(struct lwp *l, const struct linux_sys_getpriority_args *uap, register_t *retval) 1363 { 1364 /* { 1365 syscallarg(int) which; 1366 syscallarg(int) who; 1367 } */ 1368 struct sys_getpriority_args bsa; 1369 int error; 1370 1371 SCARG(&bsa, which) = SCARG(uap, which); 1372 SCARG(&bsa, who) = SCARG(uap, who); 1373 1374 if ((error = sys_getpriority(l, &bsa, retval))) 1375 return error; 1376 1377 *retval = NZERO - *retval; 1378 1379 return 0; 1380 } 1381 #endif /* !COMPAT_LINUX32 */ 1382