1/* $NetBSD: linux_misc.c,v 1.233 2016/11/10 17:00:51 christos 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 1.233 2016/11/10 17:00:51 christos 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
125const 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
142const 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};
167const 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: */
176static void linux_to_bsd_mmap_args(struct sys_mmap_args *,
177 const struct linux_sys_mmap_args *);
178static 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 */
187int
188bsd_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 */
211int
212linux_sys_wait4(struct lwp *l, const struct linux_sys_wait4_args *uap, register_t *retval)
213{
214 /* {
215 syscallarg(int) pid;
216 syscallarg(int *) status;
217 syscallarg(int) options;
218 syscallarg(struct rusage50 *) rusage;
219 } */
220 int error, status, options, linux_options, pid = SCARG(uap, pid);
221 struct rusage50 ru50;
222 struct rusage ru;
223 proc_t *p;
224
225 linux_options = SCARG(uap, options);
226 if (linux_options & ~(LINUX_WAIT4_KNOWNFLAGS))
227 return (EINVAL);
228
229 options = 0;
230 if (linux_options & LINUX_WAIT4_WNOHANG)
231 options |= WNOHANG;
232 if (linux_options & LINUX_WAIT4_WUNTRACED)
233 options |= WUNTRACED;
234 if (linux_options & LINUX_WAIT4_WCONTINUED)
235 options |= WCONTINUED;
236 if (linux_options & LINUX_WAIT4_WALL)
237 options |= WALLSIG;
238 if (linux_options & LINUX_WAIT4_WCLONE)
239 options |= WALTSIG;
240# ifdef DIAGNOSTIC
241 if (linux_options & LINUX_WAIT4_WNOTHREAD)
242 printf("WARNING: %s: linux process %d.%d called "
243 "waitpid with __WNOTHREAD set!",
244 __FILE__, l->l_proc->p_pid, l->l_lid);
245
246# endif
247
248 error = do_sys_wait(&pid, &status, options,
249 SCARG(uap, rusage) != NULL ? &ru : NULL);
250
251 retval[0] = pid;
252 if (pid == 0)
253 return error;
254
255 p = curproc;
256 mutex_enter(p->p_lock);
257 sigdelset(&p->p_sigpend.sp_set, SIGCHLD); /* XXXAD ksiginfo leak */
258 mutex_exit(p->p_lock);
259
260 if (SCARG(uap, rusage) != NULL) {
261 rusage_to_rusage50(&ru, &ru50);
262 error = copyout(&ru, SCARG(uap, rusage), sizeof(ru));
263 }
264
265 if (error == 0 && SCARG(uap, status) != NULL) {
266 status = bsd_to_linux_wstat(status);
267 error = copyout(&status, SCARG(uap, status), sizeof status);
268 }
269
270 return error;
271}
272
273/*
274 * Linux brk(2). Like native, but always return the new break value.
275 */
276int
277linux_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 */
296int
297linux_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, &ltmp);
311 error = copyout(&ltmp, SCARG(uap, sp), sizeof ltmp);
312 }
313 STATVFSBUF_PUT(sb);
314
315 return error;
316}
317
318int
319linux_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, &ltmp);
333 error = copyout(&ltmp, 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 */
346int
347linux_sys_uname(struct lwp *l, const struct linux_sys_uname_args *uap, register_t *retval)
348{
349 /* {
350 syscallarg(struct linux_utsname *) up;
351 } */
352 struct linux_utsname luts;
353
354 strlcpy(luts.l_sysname, linux_sysname, sizeof(luts.l_sysname));
355 strlcpy(luts.l_nodename, hostname, sizeof(luts.l_nodename));
356 strlcpy(luts.l_release, linux_release, sizeof(luts.l_release));
357 strlcpy(luts.l_version, linux_version, sizeof(luts.l_version));
358 strlcpy(luts.l_machine, LINUX_UNAME_ARCH, sizeof(luts.l_machine));
359 strlcpy(luts.l_domainname, domainname, sizeof(luts.l_domainname));
360
361 return copyout(&luts, SCARG(uap, up), sizeof(luts));
362}
363
364/* Used directly on: alpha, mips, ppc, sparc, sparc64 */
365/* Used indirectly on: arm, i386, m68k */
366
367/*
368 * New type Linux mmap call.
369 * Only called directly on machines with >= 6 free regs.
370 */
371int
372linux_sys_mmap(struct lwp *l, const struct linux_sys_mmap_args *uap, register_t *retval)
373{
374 /* {
375 syscallarg(unsigned long) addr;
376 syscallarg(size_t) len;
377 syscallarg(int) prot;
378 syscallarg(int) flags;
379 syscallarg(int) fd;
380 syscallarg(linux_off_t) offset;
381 } */
382
383 if (SCARG(uap, offset) & PAGE_MASK)
384 return EINVAL;
385
386 return linux_mmap(l, uap, retval, SCARG(uap, offset));
387}
388
389/*
390 * Guts of most architectures' mmap64() implementations. This shares
391 * its list of arguments with linux_sys_mmap().
392 *
393 * The difference in linux_sys_mmap2() is that "offset" is actually
394 * (offset / pagesize), not an absolute byte count. This translation
395 * to pagesize offsets is done inside glibc between the mmap64() call
396 * point, and the actual syscall.
397 */
398int
399linux_sys_mmap2(struct lwp *l, const struct linux_sys_mmap2_args *uap, register_t *retval)
400{
401 /* {
402 syscallarg(unsigned long) addr;
403 syscallarg(size_t) len;
404 syscallarg(int) prot;
405 syscallarg(int) flags;
406 syscallarg(int) fd;
407 syscallarg(linux_off_t) offset;
408 } */
409
410 return linux_mmap(l, uap, retval,
411 ((off_t)SCARG(uap, offset)) << PAGE_SHIFT);
412}
413
414/*
415 * Massage arguments and call system mmap(2).
416 */
417static int
418linux_mmap(struct lwp *l, const struct linux_sys_mmap_args *uap, register_t *retval, off_t offset)
419{
420 struct sys_mmap_args cma;
421 int error;
422 size_t mmoff=0;
423
424 linux_to_bsd_mmap_args(&cma, uap);
425 SCARG(&cma, pos) = offset;
426
427 if (SCARG(uap, flags) & LINUX_MAP_GROWSDOWN) {
428 /*
429 * Request for stack-like memory segment. On linux, this
430 * works by mmap()ping (small) segment, which is automatically
431 * extended when page fault happens below the currently
432 * allocated area. We emulate this by allocating (typically
433 * bigger) segment sized at current stack size limit, and
434 * offsetting the requested and returned address accordingly.
435 * Since physical pages are only allocated on-demand, this
436 * is effectively identical.
437 */
438 rlim_t ssl = l->l_proc->p_rlimit[RLIMIT_STACK].rlim_cur;
439
440 if (SCARG(&cma, len) < ssl) {
441 /* Compute the address offset */
442 mmoff = round_page(ssl) - SCARG(uap, len);
443
444 if (SCARG(&cma, addr))
445 SCARG(&cma, addr) = (char *)SCARG(&cma, addr) - mmoff;
446
447 SCARG(&cma, len) = (size_t) ssl;
448 }
449 }
450
451 error = sys_mmap(l, &cma, retval);
452 if (error)
453 return (error);
454
455 /* Shift the returned address for stack-like segment if necessary */
456 retval[0] += mmoff;
457
458 return (0);
459}
460
461static void
462linux_to_bsd_mmap_args(struct sys_mmap_args *cma, const struct linux_sys_mmap_args *uap)
463{
464 int flags = MAP_TRYFIXED, fl = SCARG(uap, flags);
465
466 flags |= cvtto_bsd_mask(fl, LINUX_MAP_SHARED, MAP_SHARED);
467 flags |= cvtto_bsd_mask(fl, LINUX_MAP_PRIVATE, MAP_PRIVATE);
468 flags |= cvtto_bsd_mask(fl, LINUX_MAP_FIXED, MAP_FIXED);
469 flags |= cvtto_bsd_mask(fl, LINUX_MAP_ANON, MAP_ANON);
470 flags |= cvtto_bsd_mask(fl, LINUX_MAP_LOCKED, MAP_WIRED);
471 /* XXX XAX ERH: Any other flags here? There are more defined... */
472
473 SCARG(cma, addr) = (void *)SCARG(uap, addr);
474 SCARG(cma, len) = SCARG(uap, len);
475 SCARG(cma, prot) = SCARG(uap, prot);
476 if (SCARG(cma, prot) & VM_PROT_WRITE) /* XXX */
477 SCARG(cma, prot) |= VM_PROT_READ;
478 SCARG(cma, flags) = flags;
479 SCARG(cma, fd) = flags & MAP_ANON ? -1 : SCARG(uap, fd);
480 SCARG(cma, PAD) = 0;
481}
482
483#define LINUX_MREMAP_MAYMOVE 1
484#define LINUX_MREMAP_FIXED 2
485
486int
487linux_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
537done:
538 *retval = (error != 0) ? 0 : (register_t)newva;
539 return error;
540}
541
542#ifdef USRSTACK
543int
544linux_sys_mprotect(struct lwp *l, const struct linux_sys_mprotect_args *uap, register_t *retval)
545{
546 /* {
547 syscallarg(const void *) start;
548 syscallarg(unsigned long) len;
549 syscallarg(int) prot;
550 } */
551 struct vm_map_entry *entry;
552 struct vm_map *map;
553 struct proc *p;
554 vaddr_t end, start, len, stacklim;
555 int prot, grows;
556
557 start = (vaddr_t)SCARG(uap, start);
558 len = round_page(SCARG(uap, len));
559 prot = SCARG(uap, prot);
560 grows = prot & (LINUX_PROT_GROWSDOWN | LINUX_PROT_GROWSUP);
561 prot &= ~grows;
562 end = start + len;
563
564 if (start & PAGE_MASK)
565 return EINVAL;
566 if (end < start)
567 return EINVAL;
568 if (end == start)
569 return 0;
570
571 if (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC))
572 return EINVAL;
573 if (grows == (LINUX_PROT_GROWSDOWN | LINUX_PROT_GROWSUP))
574 return EINVAL;
575
576 p = l->l_proc;
577 map = &p->p_vmspace->vm_map;
578 vm_map_lock(map);
579# ifdef notdef
580 VM_MAP_RANGE_CHECK(map, start, end);
581# endif
582 if (!uvm_map_lookup_entry(map, start, &entry) || entry->start > start) {
583 vm_map_unlock(map);
584 return ENOMEM;
585 }
586
587 /*
588 * Approximate the behaviour of PROT_GROWS{DOWN,UP}.
589 */
590
591 stacklim = (vaddr_t)p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_cur;
592 if (grows & LINUX_PROT_GROWSDOWN) {
593 if (USRSTACK - stacklim <= start && start < USRSTACK) {
594 start = USRSTACK - stacklim;
595 } else {
596 start = entry->start;
597 }
598 } else if (grows & LINUX_PROT_GROWSUP) {
599 if (USRSTACK <= end && end < USRSTACK + stacklim) {
600 end = USRSTACK + stacklim;
601 } else {
602 end = entry->end;
603 }
604 }
605 vm_map_unlock(map);
606 return uvm_map_protect(map, start, end, prot, FALSE);
607}
608#endif /* USRSTACK */
609
610/*
611 * This code is partly stolen from src/lib/libc/compat-43/times.c
612 */
613
614#define CONVTCK(r) (r.tv_sec * hz + r.tv_usec / (1000000 / hz))
615
616int
617linux_sys_times(struct lwp *l, const struct linux_sys_times_args *uap, register_t *retval)
618{
619 /* {
620 syscallarg(struct times *) tms;
621 } */
622 struct proc *p = l->l_proc;
623 struct timeval t;
624 int error;
625
626 if (SCARG(uap, tms)) {
627 struct linux_tms ltms;
628 struct rusage ru;
629
630 mutex_enter(p->p_lock);
631 calcru(p, &ru.ru_utime, &ru.ru_stime, NULL, NULL);
632 ltms.ltms_utime = CONVTCK(ru.ru_utime);
633 ltms.ltms_stime = CONVTCK(ru.ru_stime);
634 ltms.ltms_cutime = CONVTCK(p->p_stats->p_cru.ru_utime);
635 ltms.ltms_cstime = CONVTCK(p->p_stats->p_cru.ru_stime);
636 mutex_exit(p->p_lock);
637
638 if ((error = copyout(&ltms, SCARG(uap, tms), sizeof ltms)))
639 return error;
640 }
641
642 getmicrouptime(&t);
643
644 retval[0] = ((linux_clock_t)(CONVTCK(t)));
645 return 0;
646}
647
648#undef CONVTCK
649
650/*
651 * Linux 'readdir' call. This code is mostly taken from the
652 * SunOS getdents call (see compat/sunos/sunos_misc.c), though
653 * an attempt has been made to keep it a little cleaner (failing
654 * miserably, because of the cruft needed if count 1 is passed).
655 *
656 * The d_off field should contain the offset of the next valid entry,
657 * but in Linux it has the offset of the entry itself. We emulate
658 * that bug here.
659 *
660 * Read in BSD-style entries, convert them, and copy them out.
661 *
662 * Note that this doesn't handle union-mounted filesystems.
663 */
664int
665linux_sys_getdents(struct lwp *l, const struct linux_sys_getdents_args *uap, register_t *retval)
666{
667 /* {
668 syscallarg(int) fd;
669 syscallarg(struct linux_dirent *) dent;
670 syscallarg(unsigned int) count;
671 } */
672 struct dirent *bdp;
673 struct vnode *vp;
674 char *inp, *tbuf; /* BSD-format */
675 int len, reclen; /* BSD-format */
676 char *outp; /* Linux-format */
677 int resid, linux_reclen = 0; /* Linux-format */
678 struct file *fp;
679 struct uio auio;
680 struct iovec aiov;
681 struct linux_dirent idb;
682 off_t off; /* true file offset */
683 int buflen, error, eofflag, nbytes, oldcall;
684 struct vattr va;
685 off_t *cookiebuf = NULL, *cookie;
686 int ncookies;
687
688 /* fd_getvnode() will use the descriptor for us */
689 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0)
690 return (error);
691
692 if ((fp->f_flag & FREAD) == 0) {
693 error = EBADF;
694 goto out1;
695 }
696
697 vp = (struct vnode *)fp->f_data;
698 if (vp->v_type != VDIR) {
699 error = ENOTDIR;
700 goto out1;
701 }
702
703 vn_lock(vp, LK_SHARED | LK_RETRY);
704 error = VOP_GETATTR(vp, &va, l->l_cred);
705 VOP_UNLOCK(vp);
706 if (error)
707 goto out1;
708
709 nbytes = SCARG(uap, count);
710 if (nbytes == 1) { /* emulating old, broken behaviour */
711 nbytes = sizeof (idb);
712 buflen = max(va.va_blocksize, nbytes);
713 oldcall = 1;
714 } else {
715 buflen = min(MAXBSIZE, nbytes);
716 if (buflen < va.va_blocksize)
717 buflen = va.va_blocksize;
718 oldcall = 0;
719 }
720 tbuf = malloc(buflen, M_TEMP, M_WAITOK);
721
722 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
723 off = fp->f_offset;
724again:
725 aiov.iov_base = tbuf;
726 aiov.iov_len = buflen;
727 auio.uio_iov = &aiov;
728 auio.uio_iovcnt = 1;
729 auio.uio_rw = UIO_READ;
730 auio.uio_resid = buflen;
731 auio.uio_offset = off;
732 UIO_SETUP_SYSSPACE(&auio);
733 /*
734 * First we read into the malloc'ed buffer, then
735 * we massage it into user space, one record at a time.
736 */
737 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, &cookiebuf,
738 &ncookies);
739 if (error)
740 goto out;
741
742 inp = tbuf;
743 outp = (void *)SCARG(uap, dent);
744 resid = nbytes;
745 if ((len = buflen - auio.uio_resid) == 0)
746 goto eof;
747
748 for (cookie = cookiebuf; len > 0; len -= reclen) {
749 bdp = (struct dirent *)inp;
750 reclen = bdp->d_reclen;
751 if (reclen & 3)
752 panic("linux_readdir");
753 if (bdp->d_fileno == 0) {
754 inp += reclen; /* it is a hole; squish it out */
755 if (cookie)
756 off = *cookie++;
757 else
758 off += reclen;
759 continue;
760 }
761 linux_reclen = LINUX_RECLEN(&idb, bdp->d_namlen);
762 if (reclen > len || resid < linux_reclen) {
763 /* entry too big for buffer, so just stop */
764 outp++;
765 break;
766 }
767 /*
768 * Massage in place to make a Linux-shaped dirent (otherwise
769 * we have to worry about touching user memory outside of
770 * the copyout() call).
771 */
772 idb.d_ino = bdp->d_fileno;
773 /*
774 * The old readdir() call misuses the offset and reclen fields.
775 */
776 if (oldcall) {
777 idb.d_off = (linux_off_t)linux_reclen;
778 idb.d_reclen = (u_short)bdp->d_namlen;
779 } else {
780 if (sizeof (idb.d_off) <= 4 && (off >> 32) != 0) {
781 compat_offseterr(vp, "linux_getdents");
782 error = EINVAL;
783 goto out;
784 }
785 idb.d_off = (linux_off_t)off;
786 idb.d_reclen = (u_short)linux_reclen;
787 /* Linux puts d_type at the end of each record */
788 *((char *)&idb + idb.d_reclen - 1) = bdp->d_type;
789 }
790 strcpy(idb.d_name, bdp->d_name);
791 if ((error = copyout((void *)&idb, outp, linux_reclen)))
792 goto out;
793 /* advance past this real entry */
794 inp += reclen;
795 if (cookie)
796 off = *cookie++; /* each entry points to itself */
797 else
798 off += reclen;
799 /* advance output past Linux-shaped entry */
800 outp += linux_reclen;
801 resid -= linux_reclen;
802 if (oldcall)
803 break;
804 }
805
806 /* if we squished out the whole block, try again */
807 if (outp == (void *)SCARG(uap, dent)) {
808 if (cookiebuf)
809 free(cookiebuf, M_TEMP);
810 cookiebuf = NULL;
811 goto again;
812 }
813 fp->f_offset = off; /* update the vnode offset */
814
815 if (oldcall)
816 nbytes = resid + linux_reclen;
817
818eof:
819 *retval = nbytes - resid;
820out:
821 VOP_UNLOCK(vp);
822 if (cookiebuf)
823 free(cookiebuf, M_TEMP);
824 free(tbuf, M_TEMP);
825out1:
826 fd_putfile(SCARG(uap, fd));
827 return error;
828}
829
830/*
831 * Even when just using registers to pass arguments to syscalls you can
832 * have 5 of them on the i386. So this newer version of select() does
833 * this.
834 */
835int
836linux_sys_select(struct lwp *l, const struct linux_sys_select_args *uap, register_t *retval)
837{
838 /* {
839 syscallarg(int) nfds;
840 syscallarg(fd_set *) readfds;
841 syscallarg(fd_set *) writefds;
842 syscallarg(fd_set *) exceptfds;
843 syscallarg(struct timeval50 *) timeout;
844 } */
845
846 return linux_select1(l, retval, SCARG(uap, nfds), SCARG(uap, readfds),
847 SCARG(uap, writefds), SCARG(uap, exceptfds),
848 (struct linux_timeval *)SCARG(uap, timeout));
849}
850
851/*
852 * Common code for the old and new versions of select(). A couple of
853 * things are important:
854 * 1) return the amount of time left in the 'timeout' parameter
855 * 2) select never returns ERESTART on Linux, always return EINTR
856 */
857int
858linux_select1(struct lwp *l, register_t *retval, int nfds, fd_set *readfds,
859 fd_set *writefds, fd_set *exceptfds, struct linux_timeval *timeout)
860{
861 struct timespec ts0, ts1, uts, *ts = NULL;
862 struct linux_timeval ltv;
863 int error;
864
865 /*
866 * Store current time for computation of the amount of
867 * time left.
868 */
869 if (timeout) {
870 if ((error = copyin(timeout, &ltv, sizeof(ltv))))
871 return error;
872 uts.tv_sec = ltv.tv_sec;
873 uts.tv_nsec = ltv.tv_usec * 1000;
874 if (itimespecfix(&uts)) {
875 /*
876 * The timeval was invalid. Convert it to something
877 * valid that will act as it does under Linux.
878 */
879 uts.tv_sec += uts.tv_nsec / 1000000000;
880 uts.tv_nsec %= 1000000000;
881 if (uts.tv_nsec < 0) {
882 uts.tv_sec -= 1;
883 uts.tv_nsec += 1000000000;
884 }
885 if (uts.tv_sec < 0)
886 timespecclear(&uts);
887 }
888 ts = &uts;
889 nanotime(&ts0);
890 }
891
892 error = selcommon(retval, nfds, readfds, writefds, exceptfds, ts, NULL);
893
894 if (error) {
895 /*
896 * See fs/select.c in the Linux kernel. Without this,
897 * Maelstrom doesn't work.
898 */
899 if (error == ERESTART)
900 error = EINTR;
901 return error;
902 }
903
904 if (timeout) {
905 if (*retval) {
906 /*
907 * Compute how much time was left of the timeout,
908 * by subtracting the current time and the time
909 * before we started the call, and subtracting
910 * that result from the user-supplied value.
911 */
912 nanotime(&ts1);
913 timespecsub(&ts1, &ts0, &ts1);
914 timespecsub(&uts, &ts1, &uts);
915 if (uts.tv_sec < 0)
916 timespecclear(&uts);
917 } else
918 timespecclear(&uts);
919 ltv.tv_sec = uts.tv_sec;
920 ltv.tv_usec = uts.tv_nsec / 1000;
921 if ((error = copyout(&ltv, timeout, sizeof(ltv))))
922 return error;
923 }
924
925 return 0;
926}
927
928int
929linux_sys_ppoll(struct lwp *l,
930 const struct linux_sys_ppoll_args *uap, register_t *retval)
931{
932 /* {
933 syscallarg(struct pollfd *) fds;
934 syscallarg(u_int) nfds;
935 syscallarg(struct linux_timespec *) timeout;
936 syscallarg(linux_sigset_t *) sigset;
937 } */
938 struct linux_timespec lts0, *lts;
939 struct timespec ts0, *ts = NULL;
940 linux_sigset_t lsigmask0, *lsigmask;
941 sigset_t sigmask0, *sigmask = NULL;
942 int error;
943
944 lts = SCARG(uap, timeout);
945 if (lts) {
946 if ((error = copyin(lts, &lts0, sizeof(lts0))) != 0)
947 return error;
948 linux_to_native_timespec(&ts0, &lts0);
949 ts = &ts0;
950 }
951
952 lsigmask = SCARG(uap, sigset);
953 if (lsigmask) {
954 if ((error = copyin(lsigmask, &lsigmask0, sizeof(lsigmask0))))
955 return error;
956 linux_to_native_sigset(&sigmask0, &lsigmask0);
957 sigmask = &sigmask0;
958 }
959
960 return pollcommon(retval, SCARG(uap, fds), SCARG(uap, nfds),
961 ts, sigmask);
962}
963
964/*
965 * Set the 'personality' (emulation mode) for the current process. Only
966 * accept the Linux personality here (0). This call is needed because
967 * the Linux ELF crt0 issues it in an ugly kludge to make sure that
968 * ELF binaries run in Linux mode, not SVR4 mode.
969 */
970int
971linux_sys_personality(struct lwp *l, const struct linux_sys_personality_args *uap, register_t *retval)
972{
973 /* {
974 syscallarg(unsigned long) per;
975 } */
976 struct linux_emuldata *led;
977 int per;
978
979 per = SCARG(uap, per);
980 led = l->l_emuldata;
981 if (per == LINUX_PER_QUERY) {
982 retval[0] = led->led_personality;
983 return 0;
984 }
985
986 switch (per & LINUX_PER_MASK) {
987 case LINUX_PER_LINUX:
988 case LINUX_PER_LINUX32:
989 led->led_personality = per;
990 break;
991
992 default:
993 return EINVAL;
994 }
995
996 retval[0] = per;
997 return 0;
998}
999
1000/*
1001 * We have nonexistent fsuid equal to uid.
1002 * If modification is requested, refuse.
1003 */
1004int
1005linux_sys_setfsuid(struct lwp *l, const struct linux_sys_setfsuid_args *uap, register_t *retval)
1006{
1007 /* {
1008 syscallarg(uid_t) uid;
1009 } */
1010 uid_t uid;
1011
1012 uid = SCARG(uap, uid);
1013 if (kauth_cred_getuid(l->l_cred) != uid)
1014 return sys_nosys(l, uap, retval);
1015
1016 *retval = uid;
1017 return 0;
1018}
1019
1020int
1021linux_sys_setfsgid(struct lwp *l, const struct linux_sys_setfsgid_args *uap, register_t *retval)
1022{
1023 /* {
1024 syscallarg(gid_t) gid;
1025 } */
1026 gid_t gid;
1027
1028 gid = SCARG(uap, gid);
1029 if (kauth_cred_getgid(l->l_cred) != gid)
1030 return sys_nosys(l, uap, retval);
1031
1032 *retval = gid;
1033 return 0;
1034}
1035
1036int
1037linux_sys_setresuid(struct lwp *l, const struct linux_sys_setresuid_args *uap, register_t *retval)
1038{
1039 /* {
1040 syscallarg(uid_t) ruid;
1041 syscallarg(uid_t) euid;
1042 syscallarg(uid_t) suid;
1043 } */
1044
1045 /*
1046 * Note: These checks are a little different than the NetBSD
1047 * setreuid(2) call performs. This precisely follows the
1048 * behavior of the Linux kernel.
1049 */
1050
1051 return do_setresuid(l, SCARG(uap, ruid), SCARG(uap, euid),
1052 SCARG(uap, suid),
1053 ID_R_EQ_R | ID_R_EQ_E | ID_R_EQ_S |
1054 ID_E_EQ_R | ID_E_EQ_E | ID_E_EQ_S |
1055 ID_S_EQ_R | ID_S_EQ_E | ID_S_EQ_S );
1056}
1057
1058int
1059linux_sys_getresuid(struct lwp *l, const struct linux_sys_getresuid_args *uap, register_t *retval)
1060{
1061 /* {
1062 syscallarg(uid_t *) ruid;
1063 syscallarg(uid_t *) euid;
1064 syscallarg(uid_t *) suid;
1065 } */
1066 kauth_cred_t pc = l->l_cred;
1067 int error;
1068 uid_t uid;
1069
1070 /*
1071 * Linux copies these values out to userspace like so:
1072 *
1073 * 1. Copy out ruid.
1074 * 2. If that succeeds, copy out euid.
1075 * 3. If both of those succeed, copy out suid.
1076 */
1077 uid = kauth_cred_getuid(pc);
1078 if ((error = copyout(&uid, SCARG(uap, ruid), sizeof(uid_t))) != 0)
1079 return (error);
1080
1081 uid = kauth_cred_geteuid(pc);
1082 if ((error = copyout(&uid, SCARG(uap, euid), sizeof(uid_t))) != 0)
1083 return (error);
1084
1085 uid = kauth_cred_getsvuid(pc);
1086
1087 return (copyout(&uid, SCARG(uap, suid), sizeof(uid_t)));
1088}
1089
1090int
1091linux_sys_ptrace(struct lwp *l, const struct linux_sys_ptrace_args *uap, register_t *retval)
1092{
1093 /* {
1094 i386, m68k, powerpc: T=int
1095 alpha, amd64: T=long
1096 syscallarg(T) request;
1097 syscallarg(T) pid;
1098 syscallarg(T) addr;
1099 syscallarg(T) data;
1100 } */
1101 const int *ptr;
1102 int request;
1103 int error;
1104
1105 ptr = linux_ptrace_request_map;
1106 request = SCARG(uap, request);
1107 while (*ptr != -1)
1108 if (*ptr++ == request) {
1109 struct sys_ptrace_args pta;
1110
1111 SCARG(&pta, req) = *ptr;
1112 SCARG(&pta, pid) = SCARG(uap, pid);
1113 SCARG(&pta, addr) = (void *)SCARG(uap, addr);
1114 SCARG(&pta, data) = SCARG(uap, data);
1115
1116 /*
1117 * Linux ptrace(PTRACE_CONT, pid, 0, 0) means actually
1118 * to continue where the process left off previously.
1119 * The same thing is achieved by addr == (void *) 1
1120 * on NetBSD, so rewrite 'addr' appropriately.
1121 */
1122 if (request == LINUX_PTRACE_CONT && SCARG(uap, addr)==0)
1123 SCARG(&pta, addr) = (void *) 1;
1124
1125 error = sysent[SYS_ptrace].sy_call(l, &pta, retval);
1126 if (error)
1127 return error;
1128 switch (request) {
1129 case LINUX_PTRACE_PEEKTEXT:
1130 case LINUX_PTRACE_PEEKDATA:
1131 error = copyout (retval,
1132 (void *)SCARG(uap, data),
1133 sizeof *retval);
1134 *retval = SCARG(uap, data);
1135 break;
1136 default:
1137 break;
1138 }
1139 return error;
1140 }
1141 else
1142 ptr++;
1143
1144 return LINUX_SYS_PTRACE_ARCH(l, uap, retval);
1145}
1146
1147int
1148linux_sys_reboot(struct lwp *l, const struct linux_sys_reboot_args *uap, register_t *retval)
1149{
1150 /* {
1151 syscallarg(int) magic1;
1152 syscallarg(int) magic2;
1153 syscallarg(int) cmd;
1154 syscallarg(void *) arg;
1155 } */
1156 struct sys_reboot_args /* {
1157 syscallarg(int) opt;
1158 syscallarg(char *) bootstr;
1159 } */ sra;
1160 int error;
1161
1162 if ((error = kauth_authorize_system(l->l_cred,
1163 KAUTH_SYSTEM_REBOOT, 0, NULL, NULL, NULL)) != 0)
1164 return(error);
1165
1166 if (SCARG(uap, magic1) != LINUX_REBOOT_MAGIC1)
1167 return(EINVAL);
1168 if (SCARG(uap, magic2) != LINUX_REBOOT_MAGIC2 &&
1169 SCARG(uap, magic2) != LINUX_REBOOT_MAGIC2A &&
1170 SCARG(uap, magic2) != LINUX_REBOOT_MAGIC2B)
1171 return(EINVAL);
1172
1173 switch ((unsigned long)SCARG(uap, cmd)) {
1174 case LINUX_REBOOT_CMD_RESTART:
1175 SCARG(&sra, opt) = RB_AUTOBOOT;
1176 break;
1177 case LINUX_REBOOT_CMD_HALT:
1178 SCARG(&sra, opt) = RB_HALT;
1179 break;
1180 case LINUX_REBOOT_CMD_POWER_OFF:
1181 SCARG(&sra, opt) = RB_HALT|RB_POWERDOWN;
1182 break;
1183 case LINUX_REBOOT_CMD_RESTART2:
1184 /* Reboot with an argument. */
1185 SCARG(&sra, opt) = RB_AUTOBOOT|RB_STRING;
1186 SCARG(&sra, bootstr) = SCARG(uap, arg);
1187 break;
1188 case LINUX_REBOOT_CMD_CAD_ON:
1189 return(EINVAL); /* We don't implement ctrl-alt-delete */
1190 case LINUX_REBOOT_CMD_CAD_OFF:
1191 return(0);
1192 default:
1193 return(EINVAL);
1194 }
1195
1196 return(sys_reboot(l, &sra, retval));
1197}
1198
1199/*
1200 * Copy of compat_12_sys_swapon().
1201 */
1202int
1203linux_sys_swapon(struct lwp *l, const struct linux_sys_swapon_args *uap, register_t *retval)
1204{
1205 /* {
1206 syscallarg(const char *) name;
1207 } */
1208 struct sys_swapctl_args ua;
1209
1210 SCARG(&ua, cmd) = SWAP_ON;
1211 SCARG(&ua, arg) = (void *)__UNCONST(SCARG(uap, name));
1212 SCARG(&ua, misc) = 0; /* priority */
1213 return (sys_swapctl(l, &ua, retval));
1214}
1215
1216/*
1217 * Stop swapping to the file or block device specified by path.
1218 */
1219int
1220linux_sys_swapoff(struct lwp *l, const struct linux_sys_swapoff_args *uap, register_t *retval)
1221{
1222 /* {
1223 syscallarg(const char *) path;
1224 } */
1225 struct sys_swapctl_args ua;
1226
1227 SCARG(&ua, cmd) = SWAP_OFF;
1228 SCARG(&ua, arg) = __UNCONST(SCARG(uap, path)); /*XXXUNCONST*/
1229 return (sys_swapctl(l, &ua, retval));
1230}
1231
1232/*
1233 * Copy of compat_09_sys_setdomainname()
1234 */
1235/* ARGSUSED */
1236int
1237linux_sys_setdomainname(struct lwp *l, const struct linux_sys_setdomainname_args *uap, register_t *retval)
1238{
1239 /* {
1240 syscallarg(char *) domainname;
1241 syscallarg(int) len;
1242 } */
1243 int name[2];
1244
1245 name[0] = CTL_KERN;
1246 name[1] = KERN_DOMAINNAME;
1247 return (old_sysctl(&name[0], 2, 0, 0, SCARG(uap, domainname),
1248 SCARG(uap, len), l));
1249}
1250
1251/*
1252 * sysinfo()
1253 */
1254/* ARGSUSED */
1255int
1256linux_sys_sysinfo(struct lwp *l, const struct linux_sys_sysinfo_args *uap, register_t *retval)
1257{
1258 /* {
1259 syscallarg(struct linux_sysinfo *) arg;
1260 } */
1261 struct linux_sysinfo si;
1262 struct loadavg *la;
1263
1264 si.uptime = time_uptime;
1265 la = &averunnable;
1266 si.loads[0] = la->ldavg[0] * LINUX_SYSINFO_LOADS_SCALE / la->fscale;
1267 si.loads[1] = la->ldavg[1] * LINUX_SYSINFO_LOADS_SCALE / la->fscale;
1268 si.loads[2] = la->ldavg[2] * LINUX_SYSINFO_LOADS_SCALE / la->fscale;
1269 si.totalram = ctob((u_long)physmem);
1270 si.freeram = (u_long)uvmexp.free * uvmexp.pagesize;
1271 si.sharedram = 0; /* XXX */
1272 si.bufferram = (u_long)uvmexp.filepages * uvmexp.pagesize;
1273 si.totalswap = (u_long)uvmexp.swpages * uvmexp.pagesize;
1274 si.freeswap =
1275 (u_long)(uvmexp.swpages - uvmexp.swpginuse) * uvmexp.pagesize;
1276 si.procs = nprocs;
1277
1278 /* The following are only present in newer Linux kernels. */
1279 si.totalbig = 0;
1280 si.freebig = 0;
1281 si.mem_unit = 1;
1282
1283 return (copyout(&si, SCARG(uap, arg), sizeof si));
1284}
1285
1286int
1287linux_sys_getrlimit(struct lwp *l, const struct linux_sys_getrlimit_args *uap, register_t *retval)
1288{
1289 /* {
1290 syscallarg(int) which;
1291# ifdef LINUX_LARGEFILE64
1292 syscallarg(struct rlimit *) rlp;
1293# else
1294 syscallarg(struct orlimit *) rlp;
1295# endif
1296 } */
1297# ifdef LINUX_LARGEFILE64
1298 struct rlimit orl;
1299# else
1300 struct orlimit orl;
1301# endif
1302 int which;
1303
1304 which = linux_to_bsd_limit(SCARG(uap, which));
1305 if (which < 0)
1306 return -which;
1307
1308 bsd_to_linux_rlimit(&orl, &l->l_proc->p_rlimit[which]);
1309
1310 return copyout(&orl, SCARG(uap, rlp), sizeof(orl));
1311}
1312
1313int
1314linux_sys_setrlimit(struct lwp *l, const struct linux_sys_setrlimit_args *uap, register_t *retval)
1315{
1316 /* {
1317 syscallarg(int) which;
1318# ifdef LINUX_LARGEFILE64
1319 syscallarg(struct rlimit *) rlp;
1320# else
1321 syscallarg(struct orlimit *) rlp;
1322# endif
1323 } */
1324 struct rlimit rl;
1325# ifdef LINUX_LARGEFILE64
1326 struct rlimit orl;
1327# else
1328 struct orlimit orl;
1329# endif
1330 int error;
1331 int which;
1332
1333 if ((error = copyin(SCARG(uap, rlp), &orl, sizeof(orl))) != 0)
1334 return error;
1335
1336 which = linux_to_bsd_limit(SCARG(uap, which));
1337 if (which < 0)
1338 return -which;
1339
1340 linux_to_bsd_rlimit(&rl, &orl);
1341 return dosetrlimit(l, l->l_proc, which, &rl);
1342}
1343
1344# if !defined(__mips__) && !defined(__amd64__)
1345/* XXX: this doesn't look 100% common, at least mips doesn't have it */
1346int
1347linux_sys_ugetrlimit(struct lwp *l, const struct linux_sys_ugetrlimit_args *uap, register_t *retval)
1348{
1349 return linux_sys_getrlimit(l, (const void *)uap, retval);
1350}
1351# endif
1352
1353/*
1354 * This gets called for unsupported syscalls. The difference to sys_nosys()
1355 * is that process does not get SIGSYS, the call just returns with ENOSYS.
1356 * This is the way Linux does it and glibc depends on this behaviour.
1357 */
1358int
1359linux_sys_nosys(struct lwp *l, const void *v, register_t *retval)
1360{
1361 return (ENOSYS);
1362}
1363
1364int
1365linux_sys_getpriority(struct lwp *l, const struct linux_sys_getpriority_args *uap, register_t *retval)
1366{
1367 /* {
1368 syscallarg(int) which;
1369 syscallarg(int) who;
1370 } */
1371 struct sys_getpriority_args bsa;
1372 int error;
1373
1374 SCARG(&bsa, which) = SCARG(uap, which);
1375 SCARG(&bsa, who) = SCARG(uap, who);
1376
1377 if ((error = sys_getpriority(l, &bsa, retval)))
1378 return error;
1379
1380 *retval = NZERO - *retval;
1381
1382 return 0;
1383}
1384
1385int
1386linux_do_sys_utimensat(struct lwp *l, int fd, const char *path, struct timespec *tsp, int flags, register_t *retval)
1387{
1388 int follow, error;
1389
1390 follow = (flags & LINUX_AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW;
1391
1392 if (path == NULL && fd != AT_FDCWD) {
1393 file_t *fp;
1394
1395 /* fd_getvnode() will use the descriptor for us */
1396 if ((error = fd_getvnode(fd, &fp)) != 0)
1397 return error;
1398 error = do_sys_utimensat(l, AT_FDCWD, fp->f_data, NULL, 0,
1399 tsp, UIO_SYSSPACE);
1400 fd_putfile(fd);
1401 return error;
1402 }
1403
1404 return do_sys_utimensat(l, fd, NULL, path, follow, tsp, UIO_SYSSPACE);
1405}
1406
1407int
1408linux_sys_utimensat(struct lwp *l, const struct linux_sys_utimensat_args *uap,
1409 register_t *retval)
1410{
1411 /* {
1412 syscallarg(int) fd;
1413 syscallarg(const char *) path;
1414 syscallarg(const struct linux_timespec *) times;
1415 syscallarg(int) flag;
1416 } */
1417 int error;
1418 struct linux_timespec lts[2];
1419 struct timespec *tsp = NULL, ts[2];
1420
1421 if (SCARG(uap, times)) {
1422 error = copyin(SCARG(uap, times), &lts, sizeof(lts));
1423 if (error != 0)
1424 return error;
1425 linux_to_native_timespec(&ts[0], &lts[0]);
1426 linux_to_native_timespec(&ts[1], &lts[1]);
1427 tsp = ts;
1428 }
1429
1430 return linux_do_sys_utimensat(l, SCARG(uap, fd), SCARG(uap, path),
1431 tsp, SCARG(uap, flag), retval);
1432}
1433