1 /* $NetBSD: linux_misc.c,v 1.231 2015/03/14 08:32:08 njoly 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 1.231 2015/03/14 08:32:08 njoly 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
bsd_to_linux_wstat(int st)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
linux_sys_wait4(struct lwp * l,const struct linux_sys_wait4_args * uap,register_t * retval)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 options = WOPTSCHECKED;
227 if (linux_options & ~(LINUX_WAIT4_KNOWNFLAGS))
228 return (EINVAL);
229
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_WALL)
235 options |= WALLSIG;
236 if (linux_options & LINUX_WAIT4_WCLONE)
237 options |= WALTSIG;
238 # ifdef DIAGNOSTIC
239 if (linux_options & LINUX_WAIT4_WNOTHREAD)
240 printf("WARNING: %s: linux process %d.%d called "
241 "waitpid with __WNOTHREAD set!",
242 __FILE__, l->l_proc->p_pid, l->l_lid);
243
244 # endif
245
246 error = do_sys_wait(&pid, &status, options,
247 SCARG(uap, rusage) != NULL ? &ru : NULL);
248
249 retval[0] = pid;
250 if (pid == 0)
251 return error;
252
253 p = curproc;
254 mutex_enter(p->p_lock);
255 sigdelset(&p->p_sigpend.sp_set, SIGCHLD); /* XXXAD ksiginfo leak */
256 mutex_exit(p->p_lock);
257
258 if (SCARG(uap, rusage) != NULL) {
259 rusage_to_rusage50(&ru, &ru50);
260 error = copyout(&ru, SCARG(uap, rusage), sizeof(ru));
261 }
262
263 if (error == 0 && SCARG(uap, status) != NULL) {
264 status = bsd_to_linux_wstat(status);
265 error = copyout(&status, SCARG(uap, status), sizeof status);
266 }
267
268 return error;
269 }
270
271 /*
272 * Linux brk(2). Like native, but always return the new break value.
273 */
274 int
linux_sys_brk(struct lwp * l,const struct linux_sys_brk_args * uap,register_t * retval)275 linux_sys_brk(struct lwp *l, const struct linux_sys_brk_args *uap, register_t *retval)
276 {
277 /* {
278 syscallarg(char *) nsize;
279 } */
280 struct proc *p = l->l_proc;
281 struct vmspace *vm = p->p_vmspace;
282 struct sys_obreak_args oba;
283
284 SCARG(&oba, nsize) = SCARG(uap, nsize);
285
286 (void) sys_obreak(l, &oba, retval);
287 retval[0] = (register_t)((char *)vm->vm_daddr + ptoa(vm->vm_dsize));
288 return 0;
289 }
290
291 /*
292 * Implement the fs stat functions. Straightforward.
293 */
294 int
linux_sys_statfs(struct lwp * l,const struct linux_sys_statfs_args * uap,register_t * retval)295 linux_sys_statfs(struct lwp *l, const struct linux_sys_statfs_args *uap, register_t *retval)
296 {
297 /* {
298 syscallarg(const char *) path;
299 syscallarg(struct linux_statfs *) sp;
300 } */
301 struct statvfs *sb;
302 struct linux_statfs ltmp;
303 int error;
304
305 sb = STATVFSBUF_GET();
306 error = do_sys_pstatvfs(l, SCARG(uap, path), ST_WAIT, sb);
307 if (error == 0) {
308 bsd_to_linux_statfs(sb, <mp);
309 error = copyout(<mp, SCARG(uap, sp), sizeof ltmp);
310 }
311 STATVFSBUF_PUT(sb);
312
313 return error;
314 }
315
316 int
linux_sys_fstatfs(struct lwp * l,const struct linux_sys_fstatfs_args * uap,register_t * retval)317 linux_sys_fstatfs(struct lwp *l, const struct linux_sys_fstatfs_args *uap, register_t *retval)
318 {
319 /* {
320 syscallarg(int) fd;
321 syscallarg(struct linux_statfs *) sp;
322 } */
323 struct statvfs *sb;
324 struct linux_statfs ltmp;
325 int error;
326
327 sb = STATVFSBUF_GET();
328 error = do_sys_fstatvfs(l, SCARG(uap, fd), ST_WAIT, sb);
329 if (error == 0) {
330 bsd_to_linux_statfs(sb, <mp);
331 error = copyout(<mp, SCARG(uap, sp), sizeof ltmp);
332 }
333 STATVFSBUF_PUT(sb);
334
335 return error;
336 }
337
338 /*
339 * uname(). Just copy the info from the various strings stored in the
340 * kernel, and put it in the Linux utsname structure. That structure
341 * is almost the same as the NetBSD one, only it has fields 65 characters
342 * long, and an extra domainname field.
343 */
344 int
linux_sys_uname(struct lwp * l,const struct linux_sys_uname_args * uap,register_t * retval)345 linux_sys_uname(struct lwp *l, const struct linux_sys_uname_args *uap, register_t *retval)
346 {
347 /* {
348 syscallarg(struct linux_utsname *) up;
349 } */
350 struct linux_utsname luts;
351
352 strlcpy(luts.l_sysname, linux_sysname, sizeof(luts.l_sysname));
353 strlcpy(luts.l_nodename, hostname, sizeof(luts.l_nodename));
354 strlcpy(luts.l_release, linux_release, sizeof(luts.l_release));
355 strlcpy(luts.l_version, linux_version, sizeof(luts.l_version));
356 strlcpy(luts.l_machine, LINUX_UNAME_ARCH, sizeof(luts.l_machine));
357 strlcpy(luts.l_domainname, domainname, sizeof(luts.l_domainname));
358
359 return copyout(&luts, SCARG(uap, up), sizeof(luts));
360 }
361
362 /* Used directly on: alpha, mips, ppc, sparc, sparc64 */
363 /* Used indirectly on: arm, i386, m68k */
364
365 /*
366 * New type Linux mmap call.
367 * Only called directly on machines with >= 6 free regs.
368 */
369 int
linux_sys_mmap(struct lwp * l,const struct linux_sys_mmap_args * uap,register_t * retval)370 linux_sys_mmap(struct lwp *l, const struct linux_sys_mmap_args *uap, register_t *retval)
371 {
372 /* {
373 syscallarg(unsigned long) addr;
374 syscallarg(size_t) len;
375 syscallarg(int) prot;
376 syscallarg(int) flags;
377 syscallarg(int) fd;
378 syscallarg(linux_off_t) offset;
379 } */
380
381 if (SCARG(uap, offset) & PAGE_MASK)
382 return EINVAL;
383
384 return linux_mmap(l, uap, retval, SCARG(uap, offset));
385 }
386
387 /*
388 * Guts of most architectures' mmap64() implementations. This shares
389 * its list of arguments with linux_sys_mmap().
390 *
391 * The difference in linux_sys_mmap2() is that "offset" is actually
392 * (offset / pagesize), not an absolute byte count. This translation
393 * to pagesize offsets is done inside glibc between the mmap64() call
394 * point, and the actual syscall.
395 */
396 int
linux_sys_mmap2(struct lwp * l,const struct linux_sys_mmap2_args * uap,register_t * retval)397 linux_sys_mmap2(struct lwp *l, const struct linux_sys_mmap2_args *uap, register_t *retval)
398 {
399 /* {
400 syscallarg(unsigned long) addr;
401 syscallarg(size_t) len;
402 syscallarg(int) prot;
403 syscallarg(int) flags;
404 syscallarg(int) fd;
405 syscallarg(linux_off_t) offset;
406 } */
407
408 return linux_mmap(l, uap, retval,
409 ((off_t)SCARG(uap, offset)) << PAGE_SHIFT);
410 }
411
412 /*
413 * Massage arguments and call system mmap(2).
414 */
415 static int
linux_mmap(struct lwp * l,const struct linux_sys_mmap_args * uap,register_t * retval,off_t offset)416 linux_mmap(struct lwp *l, const struct linux_sys_mmap_args *uap, register_t *retval, off_t offset)
417 {
418 struct sys_mmap_args cma;
419 int error;
420 size_t mmoff=0;
421
422 linux_to_bsd_mmap_args(&cma, uap);
423 SCARG(&cma, pos) = offset;
424
425 if (SCARG(uap, flags) & LINUX_MAP_GROWSDOWN) {
426 /*
427 * Request for stack-like memory segment. On linux, this
428 * works by mmap()ping (small) segment, which is automatically
429 * extended when page fault happens below the currently
430 * allocated area. We emulate this by allocating (typically
431 * bigger) segment sized at current stack size limit, and
432 * offsetting the requested and returned address accordingly.
433 * Since physical pages are only allocated on-demand, this
434 * is effectively identical.
435 */
436 rlim_t ssl = l->l_proc->p_rlimit[RLIMIT_STACK].rlim_cur;
437
438 if (SCARG(&cma, len) < ssl) {
439 /* Compute the address offset */
440 mmoff = round_page(ssl) - SCARG(uap, len);
441
442 if (SCARG(&cma, addr))
443 SCARG(&cma, addr) = (char *)SCARG(&cma, addr) - mmoff;
444
445 SCARG(&cma, len) = (size_t) ssl;
446 }
447 }
448
449 error = sys_mmap(l, &cma, retval);
450 if (error)
451 return (error);
452
453 /* Shift the returned address for stack-like segment if necessary */
454 retval[0] += mmoff;
455
456 return (0);
457 }
458
459 static void
linux_to_bsd_mmap_args(struct sys_mmap_args * cma,const struct linux_sys_mmap_args * uap)460 linux_to_bsd_mmap_args(struct sys_mmap_args *cma, const struct linux_sys_mmap_args *uap)
461 {
462 int flags = MAP_TRYFIXED, fl = SCARG(uap, flags);
463
464 flags |= cvtto_bsd_mask(fl, LINUX_MAP_SHARED, MAP_SHARED);
465 flags |= cvtto_bsd_mask(fl, LINUX_MAP_PRIVATE, MAP_PRIVATE);
466 flags |= cvtto_bsd_mask(fl, LINUX_MAP_FIXED, MAP_FIXED);
467 flags |= cvtto_bsd_mask(fl, LINUX_MAP_ANON, MAP_ANON);
468 flags |= cvtto_bsd_mask(fl, LINUX_MAP_LOCKED, MAP_WIRED);
469 /* XXX XAX ERH: Any other flags here? There are more defined... */
470
471 SCARG(cma, addr) = (void *)SCARG(uap, addr);
472 SCARG(cma, len) = SCARG(uap, len);
473 SCARG(cma, prot) = SCARG(uap, prot);
474 if (SCARG(cma, prot) & VM_PROT_WRITE) /* XXX */
475 SCARG(cma, prot) |= VM_PROT_READ;
476 SCARG(cma, flags) = flags;
477 SCARG(cma, fd) = flags & MAP_ANON ? -1 : SCARG(uap, fd);
478 SCARG(cma, PAD) = 0;
479 }
480
481 #define LINUX_MREMAP_MAYMOVE 1
482 #define LINUX_MREMAP_FIXED 2
483
484 int
linux_sys_mremap(struct lwp * l,const struct linux_sys_mremap_args * uap,register_t * retval)485 linux_sys_mremap(struct lwp *l, const struct linux_sys_mremap_args *uap, register_t *retval)
486 {
487 /* {
488 syscallarg(void *) old_address;
489 syscallarg(size_t) old_size;
490 syscallarg(size_t) new_size;
491 syscallarg(u_long) flags;
492 } */
493
494 struct proc *p;
495 struct vm_map *map;
496 vaddr_t oldva;
497 vaddr_t newva;
498 size_t oldsize;
499 size_t newsize;
500 int flags;
501 int uvmflags;
502 int error;
503
504 flags = SCARG(uap, flags);
505 oldva = (vaddr_t)SCARG(uap, old_address);
506 oldsize = round_page(SCARG(uap, old_size));
507 newsize = round_page(SCARG(uap, new_size));
508 if ((flags & ~(LINUX_MREMAP_FIXED|LINUX_MREMAP_MAYMOVE)) != 0) {
509 error = EINVAL;
510 goto done;
511 }
512 if ((flags & LINUX_MREMAP_FIXED) != 0) {
513 if ((flags & LINUX_MREMAP_MAYMOVE) == 0) {
514 error = EINVAL;
515 goto done;
516 }
517 #if 0 /* notyet */
518 newva = SCARG(uap, new_address);
519 uvmflags = MAP_FIXED;
520 #else /* notyet */
521 error = EOPNOTSUPP;
522 goto done;
523 #endif /* notyet */
524 } else if ((flags & LINUX_MREMAP_MAYMOVE) != 0) {
525 uvmflags = 0;
526 } else {
527 newva = oldva;
528 uvmflags = MAP_FIXED;
529 }
530 p = l->l_proc;
531 map = &p->p_vmspace->vm_map;
532 error = uvm_mremap(map, oldva, oldsize, map, &newva, newsize, p,
533 uvmflags);
534
535 done:
536 *retval = (error != 0) ? 0 : (register_t)newva;
537 return error;
538 }
539
540 #ifdef USRSTACK
541 int
linux_sys_mprotect(struct lwp * l,const struct linux_sys_mprotect_args * uap,register_t * retval)542 linux_sys_mprotect(struct lwp *l, const struct linux_sys_mprotect_args *uap, register_t *retval)
543 {
544 /* {
545 syscallarg(const void *) start;
546 syscallarg(unsigned long) len;
547 syscallarg(int) prot;
548 } */
549 struct vm_map_entry *entry;
550 struct vm_map *map;
551 struct proc *p;
552 vaddr_t end, start, len, stacklim;
553 int prot, grows;
554
555 start = (vaddr_t)SCARG(uap, start);
556 len = round_page(SCARG(uap, len));
557 prot = SCARG(uap, prot);
558 grows = prot & (LINUX_PROT_GROWSDOWN | LINUX_PROT_GROWSUP);
559 prot &= ~grows;
560 end = start + len;
561
562 if (start & PAGE_MASK)
563 return EINVAL;
564 if (end < start)
565 return EINVAL;
566 if (end == start)
567 return 0;
568
569 if (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC))
570 return EINVAL;
571 if (grows == (LINUX_PROT_GROWSDOWN | LINUX_PROT_GROWSUP))
572 return EINVAL;
573
574 p = l->l_proc;
575 map = &p->p_vmspace->vm_map;
576 vm_map_lock(map);
577 # ifdef notdef
578 VM_MAP_RANGE_CHECK(map, start, end);
579 # endif
580 if (!uvm_map_lookup_entry(map, start, &entry) || entry->start > start) {
581 vm_map_unlock(map);
582 return ENOMEM;
583 }
584
585 /*
586 * Approximate the behaviour of PROT_GROWS{DOWN,UP}.
587 */
588
589 stacklim = (vaddr_t)p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_cur;
590 if (grows & LINUX_PROT_GROWSDOWN) {
591 if (USRSTACK - stacklim <= start && start < USRSTACK) {
592 start = USRSTACK - stacklim;
593 } else {
594 start = entry->start;
595 }
596 } else if (grows & LINUX_PROT_GROWSUP) {
597 if (USRSTACK <= end && end < USRSTACK + stacklim) {
598 end = USRSTACK + stacklim;
599 } else {
600 end = entry->end;
601 }
602 }
603 vm_map_unlock(map);
604 return uvm_map_protect(map, start, end, prot, FALSE);
605 }
606 #endif /* USRSTACK */
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
linux_sys_times(struct lwp * l,const struct linux_sys_times_args * uap,register_t * retval)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
linux_sys_getdents(struct lwp * l,const struct linux_sys_getdents_args * uap,register_t * retval)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 /* Linux puts d_type at the end of each record */
786 *((char *)&idb + idb.d_reclen - 1) = bdp->d_type;
787 }
788 strcpy(idb.d_name, bdp->d_name);
789 if ((error = copyout((void *)&idb, outp, linux_reclen)))
790 goto out;
791 /* advance past this real entry */
792 inp += reclen;
793 if (cookie)
794 off = *cookie++; /* each entry points to itself */
795 else
796 off += reclen;
797 /* advance output past Linux-shaped entry */
798 outp += linux_reclen;
799 resid -= linux_reclen;
800 if (oldcall)
801 break;
802 }
803
804 /* if we squished out the whole block, try again */
805 if (outp == (void *)SCARG(uap, dent)) {
806 if (cookiebuf)
807 free(cookiebuf, M_TEMP);
808 cookiebuf = NULL;
809 goto again;
810 }
811 fp->f_offset = off; /* update the vnode offset */
812
813 if (oldcall)
814 nbytes = resid + linux_reclen;
815
816 eof:
817 *retval = nbytes - resid;
818 out:
819 VOP_UNLOCK(vp);
820 if (cookiebuf)
821 free(cookiebuf, M_TEMP);
822 free(tbuf, M_TEMP);
823 out1:
824 fd_putfile(SCARG(uap, fd));
825 return error;
826 }
827
828 /*
829 * Even when just using registers to pass arguments to syscalls you can
830 * have 5 of them on the i386. So this newer version of select() does
831 * this.
832 */
833 int
linux_sys_select(struct lwp * l,const struct linux_sys_select_args * uap,register_t * retval)834 linux_sys_select(struct lwp *l, const struct linux_sys_select_args *uap, register_t *retval)
835 {
836 /* {
837 syscallarg(int) nfds;
838 syscallarg(fd_set *) readfds;
839 syscallarg(fd_set *) writefds;
840 syscallarg(fd_set *) exceptfds;
841 syscallarg(struct timeval50 *) timeout;
842 } */
843
844 return linux_select1(l, retval, SCARG(uap, nfds), SCARG(uap, readfds),
845 SCARG(uap, writefds), SCARG(uap, exceptfds),
846 (struct linux_timeval *)SCARG(uap, timeout));
847 }
848
849 /*
850 * Common code for the old and new versions of select(). A couple of
851 * things are important:
852 * 1) return the amount of time left in the 'timeout' parameter
853 * 2) select never returns ERESTART on Linux, always return EINTR
854 */
855 int
linux_select1(struct lwp * l,register_t * retval,int nfds,fd_set * readfds,fd_set * writefds,fd_set * exceptfds,struct linux_timeval * timeout)856 linux_select1(struct lwp *l, register_t *retval, int nfds, fd_set *readfds,
857 fd_set *writefds, fd_set *exceptfds, struct linux_timeval *timeout)
858 {
859 struct timespec ts0, ts1, uts, *ts = NULL;
860 struct linux_timeval ltv;
861 int error;
862
863 /*
864 * Store current time for computation of the amount of
865 * time left.
866 */
867 if (timeout) {
868 if ((error = copyin(timeout, <v, sizeof(ltv))))
869 return error;
870 uts.tv_sec = ltv.tv_sec;
871 uts.tv_nsec = ltv.tv_usec * 1000;
872 if (itimespecfix(&uts)) {
873 /*
874 * The timeval was invalid. Convert it to something
875 * valid that will act as it does under Linux.
876 */
877 uts.tv_sec += uts.tv_nsec / 1000000000;
878 uts.tv_nsec %= 1000000000;
879 if (uts.tv_nsec < 0) {
880 uts.tv_sec -= 1;
881 uts.tv_nsec += 1000000000;
882 }
883 if (uts.tv_sec < 0)
884 timespecclear(&uts);
885 }
886 ts = &uts;
887 nanotime(&ts0);
888 }
889
890 error = selcommon(retval, nfds, readfds, writefds, exceptfds, ts, NULL);
891
892 if (error) {
893 /*
894 * See fs/select.c in the Linux kernel. Without this,
895 * Maelstrom doesn't work.
896 */
897 if (error == ERESTART)
898 error = EINTR;
899 return error;
900 }
901
902 if (timeout) {
903 if (*retval) {
904 /*
905 * Compute how much time was left of the timeout,
906 * by subtracting the current time and the time
907 * before we started the call, and subtracting
908 * that result from the user-supplied value.
909 */
910 nanotime(&ts1);
911 timespecsub(&ts1, &ts0, &ts1);
912 timespecsub(&uts, &ts1, &uts);
913 if (uts.tv_sec < 0)
914 timespecclear(&uts);
915 } else
916 timespecclear(&uts);
917 ltv.tv_sec = uts.tv_sec;
918 ltv.tv_usec = uts.tv_nsec / 1000;
919 if ((error = copyout(<v, timeout, sizeof(ltv))))
920 return error;
921 }
922
923 return 0;
924 }
925
926 int
linux_sys_ppoll(struct lwp * l,const struct linux_sys_ppoll_args * uap,register_t * retval)927 linux_sys_ppoll(struct lwp *l,
928 const struct linux_sys_ppoll_args *uap, register_t *retval)
929 {
930 /* {
931 syscallarg(struct pollfd *) fds;
932 syscallarg(u_int) nfds;
933 syscallarg(struct linux_timespec *) timeout;
934 syscallarg(linux_sigset_t *) sigset;
935 } */
936 struct linux_timespec lts0, *lts;
937 struct timespec ts0, *ts = NULL;
938 linux_sigset_t lsigmask0, *lsigmask;
939 sigset_t sigmask0, *sigmask = NULL;
940 int error;
941
942 lts = SCARG(uap, timeout);
943 if (lts) {
944 if ((error = copyin(lts, <s0, sizeof(lts0))) != 0)
945 return error;
946 linux_to_native_timespec(&ts0, <s0);
947 ts = &ts0;
948 }
949
950 lsigmask = SCARG(uap, sigset);
951 if (lsigmask) {
952 if ((error = copyin(lsigmask, &lsigmask0, sizeof(lsigmask0))))
953 return error;
954 linux_to_native_sigset(&sigmask0, &lsigmask0);
955 sigmask = &sigmask0;
956 }
957
958 return pollcommon(retval, SCARG(uap, fds), SCARG(uap, nfds),
959 ts, sigmask);
960 }
961
962 /*
963 * Set the 'personality' (emulation mode) for the current process. Only
964 * accept the Linux personality here (0). This call is needed because
965 * the Linux ELF crt0 issues it in an ugly kludge to make sure that
966 * ELF binaries run in Linux mode, not SVR4 mode.
967 */
968 int
linux_sys_personality(struct lwp * l,const struct linux_sys_personality_args * uap,register_t * retval)969 linux_sys_personality(struct lwp *l, const struct linux_sys_personality_args *uap, register_t *retval)
970 {
971 /* {
972 syscallarg(unsigned long) per;
973 } */
974 struct linux_emuldata *led;
975 int per;
976
977 per = SCARG(uap, per);
978 led = l->l_emuldata;
979 if (per == LINUX_PER_QUERY) {
980 retval[0] = led->led_personality;
981 return 0;
982 }
983
984 switch (per & LINUX_PER_MASK) {
985 case LINUX_PER_LINUX:
986 case LINUX_PER_LINUX32:
987 led->led_personality = per;
988 break;
989
990 default:
991 return EINVAL;
992 }
993
994 retval[0] = per;
995 return 0;
996 }
997
998 /*
999 * We have nonexistent fsuid equal to uid.
1000 * If modification is requested, refuse.
1001 */
1002 int
linux_sys_setfsuid(struct lwp * l,const struct linux_sys_setfsuid_args * uap,register_t * retval)1003 linux_sys_setfsuid(struct lwp *l, const struct linux_sys_setfsuid_args *uap, register_t *retval)
1004 {
1005 /* {
1006 syscallarg(uid_t) uid;
1007 } */
1008 uid_t uid;
1009
1010 uid = SCARG(uap, uid);
1011 if (kauth_cred_getuid(l->l_cred) != uid)
1012 return sys_nosys(l, uap, retval);
1013
1014 *retval = uid;
1015 return 0;
1016 }
1017
1018 int
linux_sys_setfsgid(struct lwp * l,const struct linux_sys_setfsgid_args * uap,register_t * retval)1019 linux_sys_setfsgid(struct lwp *l, const struct linux_sys_setfsgid_args *uap, register_t *retval)
1020 {
1021 /* {
1022 syscallarg(gid_t) gid;
1023 } */
1024 gid_t gid;
1025
1026 gid = SCARG(uap, gid);
1027 if (kauth_cred_getgid(l->l_cred) != gid)
1028 return sys_nosys(l, uap, retval);
1029
1030 *retval = gid;
1031 return 0;
1032 }
1033
1034 int
linux_sys_setresuid(struct lwp * l,const struct linux_sys_setresuid_args * uap,register_t * retval)1035 linux_sys_setresuid(struct lwp *l, const struct linux_sys_setresuid_args *uap, register_t *retval)
1036 {
1037 /* {
1038 syscallarg(uid_t) ruid;
1039 syscallarg(uid_t) euid;
1040 syscallarg(uid_t) suid;
1041 } */
1042
1043 /*
1044 * Note: These checks are a little different than the NetBSD
1045 * setreuid(2) call performs. This precisely follows the
1046 * behavior of the Linux kernel.
1047 */
1048
1049 return do_setresuid(l, SCARG(uap, ruid), SCARG(uap, euid),
1050 SCARG(uap, suid),
1051 ID_R_EQ_R | ID_R_EQ_E | ID_R_EQ_S |
1052 ID_E_EQ_R | ID_E_EQ_E | ID_E_EQ_S |
1053 ID_S_EQ_R | ID_S_EQ_E | ID_S_EQ_S );
1054 }
1055
1056 int
linux_sys_getresuid(struct lwp * l,const struct linux_sys_getresuid_args * uap,register_t * retval)1057 linux_sys_getresuid(struct lwp *l, const struct linux_sys_getresuid_args *uap, register_t *retval)
1058 {
1059 /* {
1060 syscallarg(uid_t *) ruid;
1061 syscallarg(uid_t *) euid;
1062 syscallarg(uid_t *) suid;
1063 } */
1064 kauth_cred_t pc = l->l_cred;
1065 int error;
1066 uid_t uid;
1067
1068 /*
1069 * Linux copies these values out to userspace like so:
1070 *
1071 * 1. Copy out ruid.
1072 * 2. If that succeeds, copy out euid.
1073 * 3. If both of those succeed, copy out suid.
1074 */
1075 uid = kauth_cred_getuid(pc);
1076 if ((error = copyout(&uid, SCARG(uap, ruid), sizeof(uid_t))) != 0)
1077 return (error);
1078
1079 uid = kauth_cred_geteuid(pc);
1080 if ((error = copyout(&uid, SCARG(uap, euid), sizeof(uid_t))) != 0)
1081 return (error);
1082
1083 uid = kauth_cred_getsvuid(pc);
1084
1085 return (copyout(&uid, SCARG(uap, suid), sizeof(uid_t)));
1086 }
1087
1088 int
linux_sys_ptrace(struct lwp * l,const struct linux_sys_ptrace_args * uap,register_t * retval)1089 linux_sys_ptrace(struct lwp *l, const struct linux_sys_ptrace_args *uap, register_t *retval)
1090 {
1091 /* {
1092 i386, m68k, powerpc: T=int
1093 alpha, amd64: T=long
1094 syscallarg(T) request;
1095 syscallarg(T) pid;
1096 syscallarg(T) addr;
1097 syscallarg(T) data;
1098 } */
1099 const int *ptr;
1100 int request;
1101 int error;
1102
1103 ptr = linux_ptrace_request_map;
1104 request = SCARG(uap, request);
1105 while (*ptr != -1)
1106 if (*ptr++ == request) {
1107 struct sys_ptrace_args pta;
1108
1109 SCARG(&pta, req) = *ptr;
1110 SCARG(&pta, pid) = SCARG(uap, pid);
1111 SCARG(&pta, addr) = (void *)SCARG(uap, addr);
1112 SCARG(&pta, data) = SCARG(uap, data);
1113
1114 /*
1115 * Linux ptrace(PTRACE_CONT, pid, 0, 0) means actually
1116 * to continue where the process left off previously.
1117 * The same thing is achieved by addr == (void *) 1
1118 * on NetBSD, so rewrite 'addr' appropriately.
1119 */
1120 if (request == LINUX_PTRACE_CONT && SCARG(uap, addr)==0)
1121 SCARG(&pta, addr) = (void *) 1;
1122
1123 error = sysent[SYS_ptrace].sy_call(l, &pta, retval);
1124 if (error)
1125 return error;
1126 switch (request) {
1127 case LINUX_PTRACE_PEEKTEXT:
1128 case LINUX_PTRACE_PEEKDATA:
1129 error = copyout (retval,
1130 (void *)SCARG(uap, data),
1131 sizeof *retval);
1132 *retval = SCARG(uap, data);
1133 break;
1134 default:
1135 break;
1136 }
1137 return error;
1138 }
1139 else
1140 ptr++;
1141
1142 return LINUX_SYS_PTRACE_ARCH(l, uap, retval);
1143 }
1144
1145 int
linux_sys_reboot(struct lwp * l,const struct linux_sys_reboot_args * uap,register_t * retval)1146 linux_sys_reboot(struct lwp *l, const struct linux_sys_reboot_args *uap, register_t *retval)
1147 {
1148 /* {
1149 syscallarg(int) magic1;
1150 syscallarg(int) magic2;
1151 syscallarg(int) cmd;
1152 syscallarg(void *) arg;
1153 } */
1154 struct sys_reboot_args /* {
1155 syscallarg(int) opt;
1156 syscallarg(char *) bootstr;
1157 } */ sra;
1158 int error;
1159
1160 if ((error = kauth_authorize_system(l->l_cred,
1161 KAUTH_SYSTEM_REBOOT, 0, NULL, NULL, NULL)) != 0)
1162 return(error);
1163
1164 if (SCARG(uap, magic1) != LINUX_REBOOT_MAGIC1)
1165 return(EINVAL);
1166 if (SCARG(uap, magic2) != LINUX_REBOOT_MAGIC2 &&
1167 SCARG(uap, magic2) != LINUX_REBOOT_MAGIC2A &&
1168 SCARG(uap, magic2) != LINUX_REBOOT_MAGIC2B)
1169 return(EINVAL);
1170
1171 switch ((unsigned long)SCARG(uap, cmd)) {
1172 case LINUX_REBOOT_CMD_RESTART:
1173 SCARG(&sra, opt) = RB_AUTOBOOT;
1174 break;
1175 case LINUX_REBOOT_CMD_HALT:
1176 SCARG(&sra, opt) = RB_HALT;
1177 break;
1178 case LINUX_REBOOT_CMD_POWER_OFF:
1179 SCARG(&sra, opt) = RB_HALT|RB_POWERDOWN;
1180 break;
1181 case LINUX_REBOOT_CMD_RESTART2:
1182 /* Reboot with an argument. */
1183 SCARG(&sra, opt) = RB_AUTOBOOT|RB_STRING;
1184 SCARG(&sra, bootstr) = SCARG(uap, arg);
1185 break;
1186 case LINUX_REBOOT_CMD_CAD_ON:
1187 return(EINVAL); /* We don't implement ctrl-alt-delete */
1188 case LINUX_REBOOT_CMD_CAD_OFF:
1189 return(0);
1190 default:
1191 return(EINVAL);
1192 }
1193
1194 return(sys_reboot(l, &sra, retval));
1195 }
1196
1197 /*
1198 * Copy of compat_12_sys_swapon().
1199 */
1200 int
linux_sys_swapon(struct lwp * l,const struct linux_sys_swapon_args * uap,register_t * retval)1201 linux_sys_swapon(struct lwp *l, const struct linux_sys_swapon_args *uap, register_t *retval)
1202 {
1203 /* {
1204 syscallarg(const char *) name;
1205 } */
1206 struct sys_swapctl_args ua;
1207
1208 SCARG(&ua, cmd) = SWAP_ON;
1209 SCARG(&ua, arg) = (void *)__UNCONST(SCARG(uap, name));
1210 SCARG(&ua, misc) = 0; /* priority */
1211 return (sys_swapctl(l, &ua, retval));
1212 }
1213
1214 /*
1215 * Stop swapping to the file or block device specified by path.
1216 */
1217 int
linux_sys_swapoff(struct lwp * l,const struct linux_sys_swapoff_args * uap,register_t * retval)1218 linux_sys_swapoff(struct lwp *l, const struct linux_sys_swapoff_args *uap, register_t *retval)
1219 {
1220 /* {
1221 syscallarg(const char *) path;
1222 } */
1223 struct sys_swapctl_args ua;
1224
1225 SCARG(&ua, cmd) = SWAP_OFF;
1226 SCARG(&ua, arg) = __UNCONST(SCARG(uap, path)); /*XXXUNCONST*/
1227 return (sys_swapctl(l, &ua, retval));
1228 }
1229
1230 /*
1231 * Copy of compat_09_sys_setdomainname()
1232 */
1233 /* ARGSUSED */
1234 int
linux_sys_setdomainname(struct lwp * l,const struct linux_sys_setdomainname_args * uap,register_t * retval)1235 linux_sys_setdomainname(struct lwp *l, const struct linux_sys_setdomainname_args *uap, register_t *retval)
1236 {
1237 /* {
1238 syscallarg(char *) domainname;
1239 syscallarg(int) len;
1240 } */
1241 int name[2];
1242
1243 name[0] = CTL_KERN;
1244 name[1] = KERN_DOMAINNAME;
1245 return (old_sysctl(&name[0], 2, 0, 0, SCARG(uap, domainname),
1246 SCARG(uap, len), l));
1247 }
1248
1249 /*
1250 * sysinfo()
1251 */
1252 /* ARGSUSED */
1253 int
linux_sys_sysinfo(struct lwp * l,const struct linux_sys_sysinfo_args * uap,register_t * retval)1254 linux_sys_sysinfo(struct lwp *l, const struct linux_sys_sysinfo_args *uap, register_t *retval)
1255 {
1256 /* {
1257 syscallarg(struct linux_sysinfo *) arg;
1258 } */
1259 struct linux_sysinfo si;
1260 struct loadavg *la;
1261
1262 si.uptime = time_uptime;
1263 la = &averunnable;
1264 si.loads[0] = la->ldavg[0] * LINUX_SYSINFO_LOADS_SCALE / la->fscale;
1265 si.loads[1] = la->ldavg[1] * LINUX_SYSINFO_LOADS_SCALE / la->fscale;
1266 si.loads[2] = la->ldavg[2] * LINUX_SYSINFO_LOADS_SCALE / la->fscale;
1267 si.totalram = ctob((u_long)physmem);
1268 si.freeram = (u_long)uvmexp.free * uvmexp.pagesize;
1269 si.sharedram = 0; /* XXX */
1270 si.bufferram = (u_long)uvmexp.filepages * uvmexp.pagesize;
1271 si.totalswap = (u_long)uvmexp.swpages * uvmexp.pagesize;
1272 si.freeswap =
1273 (u_long)(uvmexp.swpages - uvmexp.swpginuse) * uvmexp.pagesize;
1274 si.procs = nprocs;
1275
1276 /* The following are only present in newer Linux kernels. */
1277 si.totalbig = 0;
1278 si.freebig = 0;
1279 si.mem_unit = 1;
1280
1281 return (copyout(&si, SCARG(uap, arg), sizeof si));
1282 }
1283
1284 int
linux_sys_getrlimit(struct lwp * l,const struct linux_sys_getrlimit_args * uap,register_t * retval)1285 linux_sys_getrlimit(struct lwp *l, const struct linux_sys_getrlimit_args *uap, register_t *retval)
1286 {
1287 /* {
1288 syscallarg(int) which;
1289 # ifdef LINUX_LARGEFILE64
1290 syscallarg(struct rlimit *) rlp;
1291 # else
1292 syscallarg(struct orlimit *) rlp;
1293 # endif
1294 } */
1295 # ifdef LINUX_LARGEFILE64
1296 struct rlimit orl;
1297 # else
1298 struct orlimit orl;
1299 # endif
1300 int which;
1301
1302 which = linux_to_bsd_limit(SCARG(uap, which));
1303 if (which < 0)
1304 return -which;
1305
1306 bsd_to_linux_rlimit(&orl, &l->l_proc->p_rlimit[which]);
1307
1308 return copyout(&orl, SCARG(uap, rlp), sizeof(orl));
1309 }
1310
1311 int
linux_sys_setrlimit(struct lwp * l,const struct linux_sys_setrlimit_args * uap,register_t * retval)1312 linux_sys_setrlimit(struct lwp *l, const struct linux_sys_setrlimit_args *uap, register_t *retval)
1313 {
1314 /* {
1315 syscallarg(int) which;
1316 # ifdef LINUX_LARGEFILE64
1317 syscallarg(struct rlimit *) rlp;
1318 # else
1319 syscallarg(struct orlimit *) rlp;
1320 # endif
1321 } */
1322 struct rlimit rl;
1323 # ifdef LINUX_LARGEFILE64
1324 struct rlimit orl;
1325 # else
1326 struct orlimit orl;
1327 # endif
1328 int error;
1329 int which;
1330
1331 if ((error = copyin(SCARG(uap, rlp), &orl, sizeof(orl))) != 0)
1332 return error;
1333
1334 which = linux_to_bsd_limit(SCARG(uap, which));
1335 if (which < 0)
1336 return -which;
1337
1338 linux_to_bsd_rlimit(&rl, &orl);
1339 return dosetrlimit(l, l->l_proc, which, &rl);
1340 }
1341
1342 # if !defined(__mips__) && !defined(__amd64__)
1343 /* XXX: this doesn't look 100% common, at least mips doesn't have it */
1344 int
linux_sys_ugetrlimit(struct lwp * l,const struct linux_sys_ugetrlimit_args * uap,register_t * retval)1345 linux_sys_ugetrlimit(struct lwp *l, const struct linux_sys_ugetrlimit_args *uap, register_t *retval)
1346 {
1347 return linux_sys_getrlimit(l, (const void *)uap, retval);
1348 }
1349 # endif
1350
1351 /*
1352 * This gets called for unsupported syscalls. The difference to sys_nosys()
1353 * is that process does not get SIGSYS, the call just returns with ENOSYS.
1354 * This is the way Linux does it and glibc depends on this behaviour.
1355 */
1356 int
linux_sys_nosys(struct lwp * l,const void * v,register_t * retval)1357 linux_sys_nosys(struct lwp *l, const void *v, register_t *retval)
1358 {
1359 return (ENOSYS);
1360 }
1361
1362 int
linux_sys_getpriority(struct lwp * l,const struct linux_sys_getpriority_args * uap,register_t * retval)1363 linux_sys_getpriority(struct lwp *l, const struct linux_sys_getpriority_args *uap, register_t *retval)
1364 {
1365 /* {
1366 syscallarg(int) which;
1367 syscallarg(int) who;
1368 } */
1369 struct sys_getpriority_args bsa;
1370 int error;
1371
1372 SCARG(&bsa, which) = SCARG(uap, which);
1373 SCARG(&bsa, who) = SCARG(uap, who);
1374
1375 if ((error = sys_getpriority(l, &bsa, retval)))
1376 return error;
1377
1378 *retval = NZERO - *retval;
1379
1380 return 0;
1381 }
1382
1383 int
linux_do_sys_utimensat(struct lwp * l,int fd,const char * path,struct timespec * tsp,int flags,register_t * retval)1384 linux_do_sys_utimensat(struct lwp *l, int fd, const char *path, struct timespec *tsp, int flags, register_t *retval)
1385 {
1386 int follow, error;
1387
1388 follow = (flags & LINUX_AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW;
1389
1390 if (path == NULL && fd != AT_FDCWD) {
1391 file_t *fp;
1392
1393 /* fd_getvnode() will use the descriptor for us */
1394 if ((error = fd_getvnode(fd, &fp)) != 0)
1395 return error;
1396 error = do_sys_utimensat(l, AT_FDCWD, fp->f_data, NULL, 0,
1397 tsp, UIO_SYSSPACE);
1398 fd_putfile(fd);
1399 return error;
1400 }
1401
1402 return do_sys_utimensat(l, fd, NULL, path, follow, tsp, UIO_SYSSPACE);
1403 }
1404
1405 int
linux_sys_utimensat(struct lwp * l,const struct linux_sys_utimensat_args * uap,register_t * retval)1406 linux_sys_utimensat(struct lwp *l, const struct linux_sys_utimensat_args *uap,
1407 register_t *retval)
1408 {
1409 /* {
1410 syscallarg(int) fd;
1411 syscallarg(const char *) path;
1412 syscallarg(const struct linux_timespec *) times;
1413 syscallarg(int) flag;
1414 } */
1415 int error;
1416 struct linux_timespec lts[2];
1417 struct timespec *tsp = NULL, ts[2];
1418
1419 if (SCARG(uap, times)) {
1420 error = copyin(SCARG(uap, times), <s, sizeof(lts));
1421 if (error != 0)
1422 return error;
1423 linux_to_native_timespec(&ts[0], <s[0]);
1424 linux_to_native_timespec(&ts[1], <s[1]);
1425 tsp = ts;
1426 }
1427
1428 return linux_do_sys_utimensat(l, SCARG(uap, fd), SCARG(uap, path),
1429 tsp, SCARG(uap, flag), retval);
1430 }
1431