2 * linux/kernel/compat.c
4 * Kernel compatibililty routines for e.g. 32 bit syscall support
7 * Copyright (C) 2002-2003 Stephen Rothwell, IBM Corporation
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
14 #include <linux/linkage.h>
15 #include <linux/compat.h>
16 #include <linux/errno.h>
17 #include <linux/time.h>
18 #include <linux/signal.h>
19 #include <linux/sched.h> /* for MAX_SCHEDULE_TIMEOUT */
20 #include <linux/futex.h> /* for FUTEX_WAIT */
21 #include <linux/syscalls.h>
22 #include <linux/unistd.h>
23 #include <linux/security.h>
25 #include <asm/uaccess.h>
27 int get_compat_timespec(struct timespec *ts, const struct compat_timespec __user *cts)
29 return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) ||
30 __get_user(ts->tv_sec, &cts->tv_sec) ||
31 __get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
34 int put_compat_timespec(const struct timespec *ts, struct compat_timespec __user *cts)
36 return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) ||
37 __put_user(ts->tv_sec, &cts->tv_sec) ||
38 __put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
41 static long compat_nanosleep_restart(struct restart_block *restart)
43 unsigned long expire = restart->arg0, now = jiffies;
44 struct compat_timespec __user *rmtp;
46 /* Did it expire while we handled signals? */
47 if (!time_after(expire, now))
50 expire = schedule_timeout_interruptible(expire - now);
54 rmtp = (struct compat_timespec __user *)restart->arg1;
56 struct compat_timespec ct;
59 jiffies_to_timespec(expire, &t);
61 ct.tv_nsec = t.tv_nsec;
62 if (copy_to_user(rmtp, &ct, sizeof(ct)))
65 /* The 'restart' block is already filled in */
66 return -ERESTART_RESTARTBLOCK;
69 asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp,
70 struct compat_timespec __user *rmtp)
73 struct restart_block *restart;
76 if (get_compat_timespec(&t, rqtp))
79 if ((t.tv_nsec >= 1000000000L) || (t.tv_nsec < 0) || (t.tv_sec < 0))
82 expire = timespec_to_jiffies(&t) + (t.tv_sec || t.tv_nsec);
83 expire = schedule_timeout_interruptible(expire);
88 jiffies_to_timespec(expire, &t);
89 if (put_compat_timespec(&t, rmtp))
92 restart = ¤t_thread_info()->restart_block;
93 restart->fn = compat_nanosleep_restart;
94 restart->arg0 = jiffies + expire;
95 restart->arg1 = (unsigned long) rmtp;
96 return -ERESTART_RESTARTBLOCK;
99 static inline long get_compat_itimerval(struct itimerval *o,
100 struct compat_itimerval __user *i)
102 return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
103 (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |
104 __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |
105 __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |
106 __get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));
109 static inline long put_compat_itimerval(struct compat_itimerval __user *o,
112 return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
113 (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |
114 __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |
115 __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |
116 __put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));
119 asmlinkage long compat_sys_getitimer(int which,
120 struct compat_itimerval __user *it)
122 struct itimerval kit;
125 error = do_getitimer(which, &kit);
126 if (!error && put_compat_itimerval(it, &kit))
131 asmlinkage long compat_sys_setitimer(int which,
132 struct compat_itimerval __user *in,
133 struct compat_itimerval __user *out)
135 struct itimerval kin, kout;
139 if (get_compat_itimerval(&kin, in))
142 memset(&kin, 0, sizeof(kin));
144 error = do_setitimer(which, &kin, out ? &kout : NULL);
147 if (put_compat_itimerval(out, &kout))
152 asmlinkage long compat_sys_times(struct compat_tms __user *tbuf)
155 * In the SMP world we might just be unlucky and have one of
156 * the times increment as we use it. Since the value is an
157 * atomically safe type this is just fine. Conceptually its
158 * as if the syscall took an instant longer to occur.
161 struct compat_tms tmp;
162 struct task_struct *tsk = current;
163 struct task_struct *t;
164 cputime_t utime, stime, cutime, cstime;
166 read_lock(&tasklist_lock);
167 utime = tsk->signal->utime;
168 stime = tsk->signal->stime;
171 utime = cputime_add(utime, t->utime);
172 stime = cputime_add(stime, t->stime);
177 * While we have tasklist_lock read-locked, no dying thread
178 * can be updating current->signal->[us]time. Instead,
179 * we got their counts included in the live thread loop.
180 * However, another thread can come in right now and
181 * do a wait call that updates current->signal->c[us]time.
182 * To make sure we always see that pair updated atomically,
183 * we take the siglock around fetching them.
185 spin_lock_irq(&tsk->sighand->siglock);
186 cutime = tsk->signal->cutime;
187 cstime = tsk->signal->cstime;
188 spin_unlock_irq(&tsk->sighand->siglock);
189 read_unlock(&tasklist_lock);
191 tmp.tms_utime = compat_jiffies_to_clock_t(cputime_to_jiffies(utime));
192 tmp.tms_stime = compat_jiffies_to_clock_t(cputime_to_jiffies(stime));
193 tmp.tms_cutime = compat_jiffies_to_clock_t(cputime_to_jiffies(cutime));
194 tmp.tms_cstime = compat_jiffies_to_clock_t(cputime_to_jiffies(cstime));
195 if (copy_to_user(tbuf, &tmp, sizeof(tmp)))
198 return compat_jiffies_to_clock_t(jiffies);
202 * Assumption: old_sigset_t and compat_old_sigset_t are both
203 * types that can be passed to put_user()/get_user().
206 asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set)
210 mm_segment_t old_fs = get_fs();
213 ret = sys_sigpending((old_sigset_t __user *) &s);
216 ret = put_user(s, set);
220 asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *set,
221 compat_old_sigset_t __user *oset)
227 if (set && get_user(s, set))
231 ret = sys_sigprocmask(how,
232 set ? (old_sigset_t __user *) &s : NULL,
233 oset ? (old_sigset_t __user *) &s : NULL);
237 ret = put_user(s, oset);
242 asmlinkage long compat_sys_futex(u32 __user *uaddr, int op, int val,
243 struct compat_timespec __user *utime, u32 __user *uaddr2,
247 unsigned long timeout = MAX_SCHEDULE_TIMEOUT;
250 if ((op == FUTEX_WAIT) && utime) {
251 if (get_compat_timespec(&t, utime))
253 timeout = timespec_to_jiffies(&t) + 1;
255 if (op >= FUTEX_REQUEUE)
256 val2 = (int) (unsigned long) utime;
258 return do_futex((unsigned long)uaddr, op, val, timeout,
259 (unsigned long)uaddr2, val2, val3);
263 asmlinkage long compat_sys_setrlimit(unsigned int resource,
264 struct compat_rlimit __user *rlim)
268 mm_segment_t old_fs = get_fs ();
270 if (resource >= RLIM_NLIMITS)
273 if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) ||
274 __get_user(r.rlim_cur, &rlim->rlim_cur) ||
275 __get_user(r.rlim_max, &rlim->rlim_max))
278 if (r.rlim_cur == COMPAT_RLIM_INFINITY)
279 r.rlim_cur = RLIM_INFINITY;
280 if (r.rlim_max == COMPAT_RLIM_INFINITY)
281 r.rlim_max = RLIM_INFINITY;
283 ret = sys_setrlimit(resource, (struct rlimit __user *) &r);
288 #ifdef COMPAT_RLIM_OLD_INFINITY
290 asmlinkage long compat_sys_old_getrlimit(unsigned int resource,
291 struct compat_rlimit __user *rlim)
295 mm_segment_t old_fs = get_fs();
298 ret = sys_old_getrlimit(resource, &r);
302 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY)
303 r.rlim_cur = COMPAT_RLIM_INFINITY;
304 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY)
305 r.rlim_max = COMPAT_RLIM_INFINITY;
307 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
308 __put_user(r.rlim_cur, &rlim->rlim_cur) ||
309 __put_user(r.rlim_max, &rlim->rlim_max))
317 asmlinkage long compat_sys_getrlimit (unsigned int resource,
318 struct compat_rlimit __user *rlim)
322 mm_segment_t old_fs = get_fs();
325 ret = sys_getrlimit(resource, (struct rlimit __user *) &r);
328 if (r.rlim_cur > COMPAT_RLIM_INFINITY)
329 r.rlim_cur = COMPAT_RLIM_INFINITY;
330 if (r.rlim_max > COMPAT_RLIM_INFINITY)
331 r.rlim_max = COMPAT_RLIM_INFINITY;
333 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
334 __put_user(r.rlim_cur, &rlim->rlim_cur) ||
335 __put_user(r.rlim_max, &rlim->rlim_max))
341 int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru)
343 if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) ||
344 __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) ||
345 __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) ||
346 __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) ||
347 __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) ||
348 __put_user(r->ru_maxrss, &ru->ru_maxrss) ||
349 __put_user(r->ru_ixrss, &ru->ru_ixrss) ||
350 __put_user(r->ru_idrss, &ru->ru_idrss) ||
351 __put_user(r->ru_isrss, &ru->ru_isrss) ||
352 __put_user(r->ru_minflt, &ru->ru_minflt) ||
353 __put_user(r->ru_majflt, &ru->ru_majflt) ||
354 __put_user(r->ru_nswap, &ru->ru_nswap) ||
355 __put_user(r->ru_inblock, &ru->ru_inblock) ||
356 __put_user(r->ru_oublock, &ru->ru_oublock) ||
357 __put_user(r->ru_msgsnd, &ru->ru_msgsnd) ||
358 __put_user(r->ru_msgrcv, &ru->ru_msgrcv) ||
359 __put_user(r->ru_nsignals, &ru->ru_nsignals) ||
360 __put_user(r->ru_nvcsw, &ru->ru_nvcsw) ||
361 __put_user(r->ru_nivcsw, &ru->ru_nivcsw))
366 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru)
370 mm_segment_t old_fs = get_fs();
373 ret = sys_getrusage(who, (struct rusage __user *) &r);
379 if (put_compat_rusage(&r, ru))
386 compat_sys_wait4(compat_pid_t pid, compat_uint_t __user *stat_addr, int options,
387 struct compat_rusage __user *ru)
390 return sys_wait4(pid, stat_addr, options, NULL);
395 mm_segment_t old_fs = get_fs();
400 (unsigned int __user *) &status : NULL),
401 options, (struct rusage __user *) &r);
405 if (put_compat_rusage(&r, ru))
407 if (stat_addr && put_user(status, stat_addr))
414 asmlinkage long compat_sys_waitid(int which, compat_pid_t pid,
415 struct compat_siginfo __user *uinfo, int options,
416 struct compat_rusage __user *uru)
421 mm_segment_t old_fs = get_fs();
423 memset(&info, 0, sizeof(info));
426 ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options,
427 uru ? (struct rusage __user *)&ru : NULL);
430 if ((ret < 0) || (info.si_signo == 0))
434 ret = put_compat_rusage(&ru, uru);
439 BUG_ON(info.si_code & __SI_MASK);
440 info.si_code |= __SI_CHLD;
441 return copy_siginfo_to_user32(uinfo, &info);
444 static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
445 unsigned len, cpumask_t *new_mask)
449 if (len < sizeof(cpumask_t))
450 memset(new_mask, 0, sizeof(cpumask_t));
451 else if (len > sizeof(cpumask_t))
452 len = sizeof(cpumask_t);
454 k = cpus_addr(*new_mask);
455 return compat_get_bitmap(k, user_mask_ptr, len * 8);
458 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
460 compat_ulong_t __user *user_mask_ptr)
465 retval = compat_get_user_cpu_mask(user_mask_ptr, len, &new_mask);
469 return sched_setaffinity(pid, new_mask);
472 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len,
473 compat_ulong_t __user *user_mask_ptr)
478 unsigned int min_length = sizeof(cpumask_t);
480 if (NR_CPUS <= BITS_PER_COMPAT_LONG)
481 min_length = sizeof(compat_ulong_t);
483 if (len < min_length)
486 ret = sched_getaffinity(pid, &mask);
491 ret = compat_put_bitmap(user_mask_ptr, k, min_length * 8);
498 static int get_compat_itimerspec(struct itimerspec *dst,
499 struct compat_itimerspec __user *src)
501 if (get_compat_timespec(&dst->it_interval, &src->it_interval) ||
502 get_compat_timespec(&dst->it_value, &src->it_value))
507 static int put_compat_itimerspec(struct compat_itimerspec __user *dst,
508 struct itimerspec *src)
510 if (put_compat_timespec(&src->it_interval, &dst->it_interval) ||
511 put_compat_timespec(&src->it_value, &dst->it_value))
516 long compat_sys_timer_create(clockid_t which_clock,
517 struct compat_sigevent __user *timer_event_spec,
518 timer_t __user *created_timer_id)
520 struct sigevent __user *event = NULL;
522 if (timer_event_spec) {
523 struct sigevent kevent;
525 event = compat_alloc_user_space(sizeof(*event));
526 if (get_compat_sigevent(&kevent, timer_event_spec) ||
527 copy_to_user(event, &kevent, sizeof(*event)))
531 return sys_timer_create(which_clock, event, created_timer_id);
534 long compat_sys_timer_settime(timer_t timer_id, int flags,
535 struct compat_itimerspec __user *new,
536 struct compat_itimerspec __user *old)
540 struct itimerspec newts, oldts;
544 if (get_compat_itimerspec(&newts, new))
548 err = sys_timer_settime(timer_id, flags,
549 (struct itimerspec __user *) &newts,
550 (struct itimerspec __user *) &oldts);
552 if (!err && old && put_compat_itimerspec(old, &oldts))
557 long compat_sys_timer_gettime(timer_t timer_id,
558 struct compat_itimerspec __user *setting)
562 struct itimerspec ts;
566 err = sys_timer_gettime(timer_id,
567 (struct itimerspec __user *) &ts);
569 if (!err && put_compat_itimerspec(setting, &ts))
574 long compat_sys_clock_settime(clockid_t which_clock,
575 struct compat_timespec __user *tp)
581 if (get_compat_timespec(&ts, tp))
585 err = sys_clock_settime(which_clock,
586 (struct timespec __user *) &ts);
591 long compat_sys_clock_gettime(clockid_t which_clock,
592 struct compat_timespec __user *tp)
600 err = sys_clock_gettime(which_clock,
601 (struct timespec __user *) &ts);
603 if (!err && put_compat_timespec(&ts, tp))
608 long compat_sys_clock_getres(clockid_t which_clock,
609 struct compat_timespec __user *tp)
617 err = sys_clock_getres(which_clock,
618 (struct timespec __user *) &ts);
620 if (!err && tp && put_compat_timespec(&ts, tp))
625 long compat_sys_clock_nanosleep(clockid_t which_clock, int flags,
626 struct compat_timespec __user *rqtp,
627 struct compat_timespec __user *rmtp)
631 struct timespec in, out;
633 if (get_compat_timespec(&in, rqtp))
638 err = sys_clock_nanosleep(which_clock, flags,
639 (struct timespec __user *) &in,
640 (struct timespec __user *) &out);
642 if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
643 put_compat_timespec(&out, rmtp))
649 * We currently only need the following fields from the sigevent
650 * structure: sigev_value, sigev_signo, sig_notify and (sometimes
651 * sigev_notify_thread_id). The others are handled in user mode.
652 * We also assume that copying sigev_value.sival_int is sufficient
653 * to keep all the bits of sigev_value.sival_ptr intact.
655 int get_compat_sigevent(struct sigevent *event,
656 const struct compat_sigevent __user *u_event)
658 memset(event, 0, sizeof(*event));
659 return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) ||
660 __get_user(event->sigev_value.sival_int,
661 &u_event->sigev_value.sival_int) ||
662 __get_user(event->sigev_signo, &u_event->sigev_signo) ||
663 __get_user(event->sigev_notify, &u_event->sigev_notify) ||
664 __get_user(event->sigev_notify_thread_id,
665 &u_event->sigev_notify_thread_id))
669 long compat_get_bitmap(unsigned long *mask, compat_ulong_t __user *umask,
670 unsigned long bitmap_size)
675 unsigned long nr_compat_longs;
677 /* align bitmap up to nearest compat_long_t boundary */
678 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
680 if (!access_ok(VERIFY_READ, umask, bitmap_size / 8))
683 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
685 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
688 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
690 * We dont want to read past the end of the userspace
691 * bitmap. We must however ensure the end of the
692 * kernel bitmap is zeroed.
694 if (nr_compat_longs-- > 0) {
695 if (__get_user(um, umask))
702 m |= (long)um << (j * BITS_PER_COMPAT_LONG);
710 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
711 unsigned long bitmap_size)
716 unsigned long nr_compat_longs;
718 /* align bitmap up to nearest compat_long_t boundary */
719 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
721 if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8))
724 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
726 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
729 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
733 * We dont want to write past the end of the userspace
736 if (nr_compat_longs-- > 0) {
737 if (__put_user(um, umask))
751 sigset_from_compat (sigset_t *set, compat_sigset_t *compat)
753 switch (_NSIG_WORDS) {
754 #if defined (__COMPAT_ENDIAN_SWAP__)
755 case 4: set->sig[3] = compat->sig[7] | (((long)compat->sig[6]) << 32 );
756 case 3: set->sig[2] = compat->sig[5] | (((long)compat->sig[4]) << 32 );
757 case 2: set->sig[1] = compat->sig[3] | (((long)compat->sig[2]) << 32 );
758 case 1: set->sig[0] = compat->sig[1] | (((long)compat->sig[0]) << 32 );
760 case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 );
761 case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 );
762 case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 );
763 case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 );
769 compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese,
770 struct compat_siginfo __user *uinfo,
771 struct compat_timespec __user *uts, compat_size_t sigsetsize)
778 long ret, timeout = 0;
780 if (sigsetsize != sizeof(sigset_t))
783 if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t)))
785 sigset_from_compat(&s, &s32);
786 sigdelsetmask(&s,sigmask(SIGKILL)|sigmask(SIGSTOP));
790 if (get_compat_timespec (&t, uts))
792 if (t.tv_nsec >= 1000000000L || t.tv_nsec < 0
797 spin_lock_irq(¤t->sighand->siglock);
798 sig = dequeue_signal(current, &s, &info);
800 timeout = MAX_SCHEDULE_TIMEOUT;
802 timeout = timespec_to_jiffies(&t)
803 +(t.tv_sec || t.tv_nsec);
805 current->real_blocked = current->blocked;
806 sigandsets(¤t->blocked, ¤t->blocked, &s);
809 spin_unlock_irq(¤t->sighand->siglock);
811 timeout = schedule_timeout_interruptible(timeout);
813 spin_lock_irq(¤t->sighand->siglock);
814 sig = dequeue_signal(current, &s, &info);
815 current->blocked = current->real_blocked;
816 siginitset(¤t->real_blocked, 0);
820 spin_unlock_irq(¤t->sighand->siglock);
825 if (copy_siginfo_to_user32(uinfo, &info))
829 ret = timeout?-EINTR:-EAGAIN;
835 #ifdef __ARCH_WANT_COMPAT_SYS_TIME
837 /* compat_time_t is a 32 bit "long" and needs to get converted. */
839 asmlinkage long compat_sys_time(compat_time_t __user * tloc)
844 do_gettimeofday(&tv);
848 if (put_user(i,tloc))
854 asmlinkage long compat_sys_stime(compat_time_t __user *tptr)
859 if (get_user(tv.tv_sec, tptr))
864 err = security_settime(&tv, NULL);
868 do_settimeofday(&tv);
872 #endif /* __ARCH_WANT_COMPAT_SYS_TIME */
874 #ifdef __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND
875 asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset, compat_size_t sigsetsize)
878 compat_sigset_t newset32;
880 /* XXX: Don't preclude handling different sized sigset_t's. */
881 if (sigsetsize != sizeof(sigset_t))
884 if (copy_from_user(&newset32, unewset, sizeof(compat_sigset_t)))
886 sigset_from_compat(&newset, &newset32);
887 sigdelsetmask(&newset, sigmask(SIGKILL)|sigmask(SIGSTOP));
889 spin_lock_irq(¤t->sighand->siglock);
890 current->saved_sigmask = current->blocked;
891 current->blocked = newset;
893 spin_unlock_irq(¤t->sighand->siglock);
895 current->state = TASK_INTERRUPTIBLE;
897 set_thread_flag(TIF_RESTORE_SIGMASK);
898 return -ERESTARTNOHAND;
900 #endif /* __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND */