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>
28 int get_compat_timespec(struct timespec *ts, const struct compat_timespec __user *cts)
30 return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) ||
31 __get_user(ts->tv_sec, &cts->tv_sec) ||
32 __get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
35 int put_compat_timespec(const struct timespec *ts, struct compat_timespec __user *cts)
37 return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) ||
38 __put_user(ts->tv_sec, &cts->tv_sec) ||
39 __put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
42 static long compat_nanosleep_restart(struct restart_block *restart)
44 unsigned long expire = restart->arg0, now = jiffies;
45 struct compat_timespec __user *rmtp;
47 /* Did it expire while we handled signals? */
48 if (!time_after(expire, now))
51 current->state = TASK_INTERRUPTIBLE;
52 expire = schedule_timeout(expire - now);
56 rmtp = (struct compat_timespec __user *)restart->arg1;
58 struct compat_timespec ct;
61 jiffies_to_timespec(expire, &t);
63 ct.tv_nsec = t.tv_nsec;
64 if (copy_to_user(rmtp, &ct, sizeof(ct)))
67 /* The 'restart' block is already filled in */
68 return -ERESTART_RESTARTBLOCK;
71 asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp,
72 struct compat_timespec __user *rmtp)
75 struct restart_block *restart;
78 if (get_compat_timespec(&t, rqtp))
81 if ((t.tv_nsec >= 1000000000L) || (t.tv_nsec < 0) || (t.tv_sec < 0))
84 expire = timespec_to_jiffies(&t) + (t.tv_sec || t.tv_nsec);
85 current->state = TASK_INTERRUPTIBLE;
86 expire = schedule_timeout(expire);
91 jiffies_to_timespec(expire, &t);
92 if (put_compat_timespec(&t, rmtp))
95 restart = ¤t_thread_info()->restart_block;
96 restart->fn = compat_nanosleep_restart;
97 restart->arg0 = jiffies + expire;
98 restart->arg1 = (unsigned long) rmtp;
99 return -ERESTART_RESTARTBLOCK;
102 static inline long get_compat_itimerval(struct itimerval *o,
103 struct compat_itimerval __user *i)
105 return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
106 (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |
107 __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |
108 __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |
109 __get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));
112 static inline long put_compat_itimerval(struct compat_itimerval __user *o,
115 return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
116 (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |
117 __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |
118 __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |
119 __put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));
122 asmlinkage long compat_sys_getitimer(int which,
123 struct compat_itimerval __user *it)
125 struct itimerval kit;
128 error = do_getitimer(which, &kit);
129 if (!error && put_compat_itimerval(it, &kit))
134 asmlinkage long compat_sys_setitimer(int which,
135 struct compat_itimerval __user *in,
136 struct compat_itimerval __user *out)
138 struct itimerval kin, kout;
142 if (get_compat_itimerval(&kin, in))
145 memset(&kin, 0, sizeof(kin));
147 error = do_setitimer(which, &kin, out ? &kout : NULL);
150 if (put_compat_itimerval(out, &kout))
155 asmlinkage long compat_sys_times(struct compat_tms __user *tbuf)
158 * In the SMP world we might just be unlucky and have one of
159 * the times increment as we use it. Since the value is an
160 * atomically safe type this is just fine. Conceptually its
161 * as if the syscall took an instant longer to occur.
164 struct compat_tms tmp;
165 struct task_struct *tsk = current;
166 struct task_struct *t;
167 cputime_t utime, stime, cutime, cstime;
169 read_lock(&tasklist_lock);
170 utime = tsk->signal->utime;
171 stime = tsk->signal->stime;
174 utime = cputime_add(utime, t->utime);
175 stime = cputime_add(stime, t->stime);
180 * While we have tasklist_lock read-locked, no dying thread
181 * can be updating current->signal->[us]time. Instead,
182 * we got their counts included in the live thread loop.
183 * However, another thread can come in right now and
184 * do a wait call that updates current->signal->c[us]time.
185 * To make sure we always see that pair updated atomically,
186 * we take the siglock around fetching them.
188 spin_lock_irq(&tsk->sighand->siglock);
189 cutime = tsk->signal->cutime;
190 cstime = tsk->signal->cstime;
191 spin_unlock_irq(&tsk->sighand->siglock);
192 read_unlock(&tasklist_lock);
194 tmp.tms_utime = compat_jiffies_to_clock_t(cputime_to_jiffies(utime));
195 tmp.tms_stime = compat_jiffies_to_clock_t(cputime_to_jiffies(stime));
196 tmp.tms_cutime = compat_jiffies_to_clock_t(cputime_to_jiffies(cutime));
197 tmp.tms_cstime = compat_jiffies_to_clock_t(cputime_to_jiffies(cstime));
198 if (copy_to_user(tbuf, &tmp, sizeof(tmp)))
201 return compat_jiffies_to_clock_t(jiffies);
205 * Assumption: old_sigset_t and compat_old_sigset_t are both
206 * types that can be passed to put_user()/get_user().
209 asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set)
213 mm_segment_t old_fs = get_fs();
216 ret = sys_sigpending((old_sigset_t __user *) &s);
219 ret = put_user(s, set);
223 asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *set,
224 compat_old_sigset_t __user *oset)
230 if (set && get_user(s, set))
234 ret = sys_sigprocmask(how,
235 set ? (old_sigset_t __user *) &s : NULL,
236 oset ? (old_sigset_t __user *) &s : NULL);
240 ret = put_user(s, oset);
245 asmlinkage long compat_sys_futex(u32 __user *uaddr, int op, int val,
246 struct compat_timespec __user *utime, u32 __user *uaddr2,
250 unsigned long timeout = MAX_SCHEDULE_TIMEOUT;
253 if ((op == FUTEX_WAIT) && utime) {
254 if (get_compat_timespec(&t, utime))
256 timeout = timespec_to_jiffies(&t) + 1;
258 if (op >= FUTEX_REQUEUE)
259 val2 = (int) (unsigned long) utime;
261 return do_futex((unsigned long)uaddr, op, val, timeout,
262 (unsigned long)uaddr2, val2, val3);
266 asmlinkage long compat_sys_setrlimit(unsigned int resource,
267 struct compat_rlimit __user *rlim)
271 mm_segment_t old_fs = get_fs ();
273 if (resource >= RLIM_NLIMITS)
276 if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) ||
277 __get_user(r.rlim_cur, &rlim->rlim_cur) ||
278 __get_user(r.rlim_max, &rlim->rlim_max))
281 if (r.rlim_cur == COMPAT_RLIM_INFINITY)
282 r.rlim_cur = RLIM_INFINITY;
283 if (r.rlim_max == COMPAT_RLIM_INFINITY)
284 r.rlim_max = RLIM_INFINITY;
286 ret = sys_setrlimit(resource, (struct rlimit __user *) &r);
291 #ifdef COMPAT_RLIM_OLD_INFINITY
293 asmlinkage long compat_sys_old_getrlimit(unsigned int resource,
294 struct compat_rlimit __user *rlim)
298 mm_segment_t old_fs = get_fs();
301 ret = sys_old_getrlimit(resource, &r);
305 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY)
306 r.rlim_cur = COMPAT_RLIM_INFINITY;
307 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY)
308 r.rlim_max = COMPAT_RLIM_INFINITY;
310 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
311 __put_user(r.rlim_cur, &rlim->rlim_cur) ||
312 __put_user(r.rlim_max, &rlim->rlim_max))
320 asmlinkage long compat_sys_getrlimit (unsigned int resource,
321 struct compat_rlimit __user *rlim)
325 mm_segment_t old_fs = get_fs();
328 ret = sys_getrlimit(resource, (struct rlimit __user *) &r);
331 if (r.rlim_cur > COMPAT_RLIM_INFINITY)
332 r.rlim_cur = COMPAT_RLIM_INFINITY;
333 if (r.rlim_max > COMPAT_RLIM_INFINITY)
334 r.rlim_max = COMPAT_RLIM_INFINITY;
336 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
337 __put_user(r.rlim_cur, &rlim->rlim_cur) ||
338 __put_user(r.rlim_max, &rlim->rlim_max))
344 int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru)
346 if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) ||
347 __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) ||
348 __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) ||
349 __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) ||
350 __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) ||
351 __put_user(r->ru_maxrss, &ru->ru_maxrss) ||
352 __put_user(r->ru_ixrss, &ru->ru_ixrss) ||
353 __put_user(r->ru_idrss, &ru->ru_idrss) ||
354 __put_user(r->ru_isrss, &ru->ru_isrss) ||
355 __put_user(r->ru_minflt, &ru->ru_minflt) ||
356 __put_user(r->ru_majflt, &ru->ru_majflt) ||
357 __put_user(r->ru_nswap, &ru->ru_nswap) ||
358 __put_user(r->ru_inblock, &ru->ru_inblock) ||
359 __put_user(r->ru_oublock, &ru->ru_oublock) ||
360 __put_user(r->ru_msgsnd, &ru->ru_msgsnd) ||
361 __put_user(r->ru_msgrcv, &ru->ru_msgrcv) ||
362 __put_user(r->ru_nsignals, &ru->ru_nsignals) ||
363 __put_user(r->ru_nvcsw, &ru->ru_nvcsw) ||
364 __put_user(r->ru_nivcsw, &ru->ru_nivcsw))
369 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru)
373 mm_segment_t old_fs = get_fs();
376 ret = sys_getrusage(who, (struct rusage __user *) &r);
382 if (put_compat_rusage(&r, ru))
389 compat_sys_wait4(compat_pid_t pid, compat_uint_t __user *stat_addr, int options,
390 struct compat_rusage __user *ru)
393 return sys_wait4(pid, stat_addr, options, NULL);
398 mm_segment_t old_fs = get_fs();
403 (unsigned int __user *) &status : NULL),
404 options, (struct rusage __user *) &r);
408 if (put_compat_rusage(&r, ru))
410 if (stat_addr && put_user(status, stat_addr))
417 asmlinkage long compat_sys_waitid(int which, compat_pid_t pid,
418 struct compat_siginfo __user *uinfo, int options,
419 struct compat_rusage __user *uru)
424 mm_segment_t old_fs = get_fs();
426 memset(&info, 0, sizeof(info));
429 ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options,
430 uru ? (struct rusage __user *)&ru : NULL);
433 if ((ret < 0) || (info.si_signo == 0))
437 ret = put_compat_rusage(&ru, uru);
442 BUG_ON(info.si_code & __SI_MASK);
443 info.si_code |= __SI_CHLD;
444 return copy_siginfo_to_user32(uinfo, &info);
447 static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
448 unsigned len, cpumask_t *new_mask)
452 if (len < sizeof(cpumask_t))
453 memset(new_mask, 0, sizeof(cpumask_t));
454 else if (len > sizeof(cpumask_t))
455 len = sizeof(cpumask_t);
457 k = cpus_addr(*new_mask);
458 return compat_get_bitmap(k, user_mask_ptr, len * 8);
461 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
463 compat_ulong_t __user *user_mask_ptr)
468 retval = compat_get_user_cpu_mask(user_mask_ptr, len, &new_mask);
472 return sched_setaffinity(pid, new_mask);
475 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len,
476 compat_ulong_t __user *user_mask_ptr)
481 unsigned int min_length = sizeof(cpumask_t);
483 if (NR_CPUS <= BITS_PER_COMPAT_LONG)
484 min_length = sizeof(compat_ulong_t);
486 if (len < min_length)
489 ret = sched_getaffinity(pid, &mask);
494 ret = compat_put_bitmap(user_mask_ptr, k, min_length * 8);
501 static int get_compat_itimerspec(struct itimerspec *dst,
502 struct compat_itimerspec __user *src)
504 if (get_compat_timespec(&dst->it_interval, &src->it_interval) ||
505 get_compat_timespec(&dst->it_value, &src->it_value))
510 static int put_compat_itimerspec(struct compat_itimerspec __user *dst,
511 struct itimerspec *src)
513 if (put_compat_timespec(&src->it_interval, &dst->it_interval) ||
514 put_compat_timespec(&src->it_value, &dst->it_value))
519 long compat_sys_timer_settime(timer_t timer_id, int flags,
520 struct compat_itimerspec __user *new,
521 struct compat_itimerspec __user *old)
525 struct itimerspec newts, oldts;
529 if (get_compat_itimerspec(&newts, new))
533 err = sys_timer_settime(timer_id, flags,
534 (struct itimerspec __user *) &newts,
535 (struct itimerspec __user *) &oldts);
537 if (!err && old && put_compat_itimerspec(old, &oldts))
542 long compat_sys_timer_gettime(timer_t timer_id,
543 struct compat_itimerspec __user *setting)
547 struct itimerspec ts;
551 err = sys_timer_gettime(timer_id,
552 (struct itimerspec __user *) &ts);
554 if (!err && put_compat_itimerspec(setting, &ts))
559 long compat_sys_clock_settime(clockid_t which_clock,
560 struct compat_timespec __user *tp)
566 if (get_compat_timespec(&ts, tp))
570 err = sys_clock_settime(which_clock,
571 (struct timespec __user *) &ts);
576 long compat_sys_clock_gettime(clockid_t which_clock,
577 struct compat_timespec __user *tp)
585 err = sys_clock_gettime(which_clock,
586 (struct timespec __user *) &ts);
588 if (!err && put_compat_timespec(&ts, tp))
593 long compat_sys_clock_getres(clockid_t which_clock,
594 struct compat_timespec __user *tp)
602 err = sys_clock_getres(which_clock,
603 (struct timespec __user *) &ts);
605 if (!err && tp && put_compat_timespec(&ts, tp))
610 long compat_sys_clock_nanosleep(clockid_t which_clock, int flags,
611 struct compat_timespec __user *rqtp,
612 struct compat_timespec __user *rmtp)
616 struct timespec in, out;
618 if (get_compat_timespec(&in, rqtp))
623 err = sys_clock_nanosleep(which_clock, flags,
624 (struct timespec __user *) &in,
625 (struct timespec __user *) &out);
627 if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
628 put_compat_timespec(&out, rmtp))
634 * We currently only need the following fields from the sigevent
635 * structure: sigev_value, sigev_signo, sig_notify and (sometimes
636 * sigev_notify_thread_id). The others are handled in user mode.
637 * We also assume that copying sigev_value.sival_int is sufficient
638 * to keep all the bits of sigev_value.sival_ptr intact.
640 int get_compat_sigevent(struct sigevent *event,
641 const struct compat_sigevent __user *u_event)
643 memset(event, 0, sizeof(*event));
644 return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) ||
645 __get_user(event->sigev_value.sival_int,
646 &u_event->sigev_value.sival_int) ||
647 __get_user(event->sigev_signo, &u_event->sigev_signo) ||
648 __get_user(event->sigev_notify, &u_event->sigev_notify) ||
649 __get_user(event->sigev_notify_thread_id,
650 &u_event->sigev_notify_thread_id))
654 /* timer_create is architecture specific because it needs sigevent conversion */
656 long compat_get_bitmap(unsigned long *mask, compat_ulong_t __user *umask,
657 unsigned long bitmap_size)
662 unsigned long nr_compat_longs;
664 /* align bitmap up to nearest compat_long_t boundary */
665 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
667 if (!access_ok(VERIFY_READ, umask, bitmap_size / 8))
670 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
672 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
675 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
677 * We dont want to read past the end of the userspace
678 * bitmap. We must however ensure the end of the
679 * kernel bitmap is zeroed.
681 if (nr_compat_longs-- > 0) {
682 if (__get_user(um, umask))
689 m |= (long)um << (j * BITS_PER_COMPAT_LONG);
697 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
698 unsigned long bitmap_size)
703 unsigned long nr_compat_longs;
705 /* align bitmap up to nearest compat_long_t boundary */
706 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
708 if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8))
711 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
713 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
716 for (j = 0; j < sizeof(m)/sizeof(um); j++) {
720 * We dont want to write past the end of the userspace
723 if (nr_compat_longs-- > 0) {
724 if (__put_user(um, umask))
738 sigset_from_compat (sigset_t *set, compat_sigset_t *compat)
740 switch (_NSIG_WORDS) {
741 #if defined (__COMPAT_ENDIAN_SWAP__)
742 case 4: set->sig[3] = compat->sig[7] | (((long)compat->sig[6]) << 32 );
743 case 3: set->sig[2] = compat->sig[5] | (((long)compat->sig[4]) << 32 );
744 case 2: set->sig[1] = compat->sig[3] | (((long)compat->sig[2]) << 32 );
745 case 1: set->sig[0] = compat->sig[1] | (((long)compat->sig[0]) << 32 );
747 case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 );
748 case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 );
749 case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 );
750 case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 );
756 compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese,
757 struct compat_siginfo __user *uinfo,
758 struct compat_timespec __user *uts, compat_size_t sigsetsize)
765 long ret, timeout = 0;
767 if (sigsetsize != sizeof(sigset_t))
770 if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t)))
772 sigset_from_compat(&s, &s32);
773 sigdelsetmask(&s,sigmask(SIGKILL)|sigmask(SIGSTOP));
777 if (get_compat_timespec (&t, uts))
779 if (t.tv_nsec >= 1000000000L || t.tv_nsec < 0
784 spin_lock_irq(¤t->sighand->siglock);
785 sig = dequeue_signal(current, &s, &info);
787 timeout = MAX_SCHEDULE_TIMEOUT;
789 timeout = timespec_to_jiffies(&t)
790 +(t.tv_sec || t.tv_nsec);
792 current->real_blocked = current->blocked;
793 sigandsets(¤t->blocked, ¤t->blocked, &s);
796 spin_unlock_irq(¤t->sighand->siglock);
798 current->state = TASK_INTERRUPTIBLE;
799 timeout = schedule_timeout(timeout);
801 spin_lock_irq(¤t->sighand->siglock);
802 sig = dequeue_signal(current, &s, &info);
803 current->blocked = current->real_blocked;
804 siginitset(¤t->real_blocked, 0);
808 spin_unlock_irq(¤t->sighand->siglock);
813 if (copy_siginfo_to_user32(uinfo, &info))
817 ret = timeout?-EINTR:-EAGAIN;
823 #ifdef __ARCH_WANT_COMPAT_SYS_TIME
825 /* compat_time_t is a 32 bit "long" and needs to get converted. */
827 asmlinkage long compat_sys_time(compat_time_t __user * tloc)
832 do_gettimeofday(&tv);
836 if (put_user(i,tloc))
842 asmlinkage long compat_sys_stime(compat_time_t __user *tptr)
847 if (get_user(tv.tv_sec, tptr))
852 err = security_settime(&tv, NULL);
856 do_settimeofday(&tv);
860 #endif /* __ARCH_WANT_COMPAT_SYS_TIME */