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>
24 #include <asm/uaccess.h>
26 int get_compat_timespec(struct timespec *ts, const struct compat_timespec __user *cts)
28 return (verify_area(VERIFY_READ, cts, sizeof(*cts)) ||
29 __get_user(ts->tv_sec, &cts->tv_sec) ||
30 __get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
33 int put_compat_timespec(const struct timespec *ts, struct compat_timespec __user *cts)
35 return (verify_area(VERIFY_WRITE, cts, sizeof(*cts)) ||
36 __put_user(ts->tv_sec, &cts->tv_sec) ||
37 __put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
40 static long compat_nanosleep_restart(struct restart_block *restart)
42 unsigned long expire = restart->arg0, now = jiffies;
43 struct compat_timespec __user *rmtp;
45 /* Did it expire while we handled signals? */
46 if (!time_after(expire, now))
49 current->state = TASK_INTERRUPTIBLE;
50 expire = schedule_timeout(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 current->state = TASK_INTERRUPTIBLE;
84 expire = schedule_timeout(expire);
89 jiffies_to_timespec(expire, &t);
90 if (put_compat_timespec(&t, rmtp))
93 restart = ¤t_thread_info()->restart_block;
94 restart->fn = compat_nanosleep_restart;
95 restart->arg0 = jiffies + expire;
96 restart->arg1 = (unsigned long) rmtp;
97 return -ERESTART_RESTARTBLOCK;
100 static inline long get_compat_itimerval(struct itimerval *o,
101 struct compat_itimerval __user *i)
103 return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
104 (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |
105 __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |
106 __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |
107 __get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));
110 static inline long put_compat_itimerval(struct compat_itimerval __user *o,
113 return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
114 (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |
115 __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |
116 __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |
117 __put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));
120 asmlinkage long compat_sys_getitimer(int which,
121 struct compat_itimerval __user *it)
123 struct itimerval kit;
126 error = do_getitimer(which, &kit);
127 if (!error && put_compat_itimerval(it, &kit))
132 asmlinkage long compat_sys_setitimer(int which,
133 struct compat_itimerval __user *in,
134 struct compat_itimerval __user *out)
136 struct itimerval kin, kout;
140 if (get_compat_itimerval(&kin, in))
143 memset(&kin, 0, sizeof(kin));
145 error = do_setitimer(which, &kin, out ? &kout : NULL);
148 if (put_compat_itimerval(out, &kout))
153 asmlinkage long compat_sys_times(struct compat_tms __user *tbuf)
156 * In the SMP world we might just be unlucky and have one of
157 * the times increment as we use it. Since the value is an
158 * atomically safe type this is just fine. Conceptually its
159 * as if the syscall took an instant longer to occur.
162 struct compat_tms tmp;
163 tmp.tms_utime = compat_jiffies_to_clock_t(current->utime);
164 tmp.tms_stime = compat_jiffies_to_clock_t(current->stime);
165 tmp.tms_cutime = compat_jiffies_to_clock_t(current->cutime);
166 tmp.tms_cstime = compat_jiffies_to_clock_t(current->cstime);
167 if (copy_to_user(tbuf, &tmp, sizeof(tmp)))
170 return compat_jiffies_to_clock_t(jiffies);
174 * Assumption: old_sigset_t and compat_old_sigset_t are both
175 * types that can be passed to put_user()/get_user().
178 asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set)
182 mm_segment_t old_fs = get_fs();
185 ret = sys_sigpending(&s);
188 ret = put_user(s, set);
192 asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *set,
193 compat_old_sigset_t __user *oset)
199 if (set && get_user(s, set))
203 ret = sys_sigprocmask(how, set ? &s : NULL, oset ? &s : NULL);
207 ret = put_user(s, oset);
212 asmlinkage long compat_sys_futex(u32 __user *uaddr, int op, int val,
213 struct compat_timespec __user *utime, u32 __user *uaddr2)
216 unsigned long timeout = MAX_SCHEDULE_TIMEOUT;
219 if ((op == FUTEX_WAIT) && utime) {
220 if (get_compat_timespec(&t, utime))
222 timeout = timespec_to_jiffies(&t) + 1;
224 if (op == FUTEX_REQUEUE)
225 val2 = (int) (long) utime;
227 return do_futex((unsigned long)uaddr, op, val, timeout,
228 (unsigned long)uaddr2, val2);
232 asmlinkage long compat_sys_setrlimit(unsigned int resource,
233 struct compat_rlimit __user *rlim)
237 mm_segment_t old_fs = get_fs ();
239 if (resource >= RLIM_NLIMITS)
242 if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) ||
243 __get_user(r.rlim_cur, &rlim->rlim_cur) ||
244 __get_user(r.rlim_max, &rlim->rlim_max))
247 if (r.rlim_cur == COMPAT_RLIM_INFINITY)
248 r.rlim_cur = RLIM_INFINITY;
249 if (r.rlim_max == COMPAT_RLIM_INFINITY)
250 r.rlim_max = RLIM_INFINITY;
252 ret = sys_setrlimit(resource, &r);
257 #ifdef COMPAT_RLIM_OLD_INFINITY
259 asmlinkage long compat_sys_old_getrlimit(unsigned int resource,
260 struct compat_rlimit __user *rlim)
264 mm_segment_t old_fs = get_fs();
267 ret = sys_old_getrlimit(resource, &r);
271 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY)
272 r.rlim_cur = COMPAT_RLIM_INFINITY;
273 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY)
274 r.rlim_max = COMPAT_RLIM_INFINITY;
276 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
277 __put_user(r.rlim_cur, &rlim->rlim_cur) ||
278 __put_user(r.rlim_max, &rlim->rlim_max))
286 asmlinkage long compat_sys_getrlimit (unsigned int resource,
287 struct compat_rlimit __user *rlim)
291 mm_segment_t old_fs = get_fs();
294 ret = sys_getrlimit(resource, &r);
297 if (r.rlim_cur > COMPAT_RLIM_INFINITY)
298 r.rlim_cur = COMPAT_RLIM_INFINITY;
299 if (r.rlim_max > COMPAT_RLIM_INFINITY)
300 r.rlim_max = COMPAT_RLIM_INFINITY;
302 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
303 __put_user(r.rlim_cur, &rlim->rlim_cur) ||
304 __put_user(r.rlim_max, &rlim->rlim_max))
310 static long put_compat_rusage(struct compat_rusage __user *ru, struct rusage *r)
312 if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) ||
313 __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) ||
314 __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) ||
315 __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) ||
316 __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) ||
317 __put_user(r->ru_maxrss, &ru->ru_maxrss) ||
318 __put_user(r->ru_ixrss, &ru->ru_ixrss) ||
319 __put_user(r->ru_idrss, &ru->ru_idrss) ||
320 __put_user(r->ru_isrss, &ru->ru_isrss) ||
321 __put_user(r->ru_minflt, &ru->ru_minflt) ||
322 __put_user(r->ru_majflt, &ru->ru_majflt) ||
323 __put_user(r->ru_nswap, &ru->ru_nswap) ||
324 __put_user(r->ru_inblock, &ru->ru_inblock) ||
325 __put_user(r->ru_oublock, &ru->ru_oublock) ||
326 __put_user(r->ru_msgsnd, &ru->ru_msgsnd) ||
327 __put_user(r->ru_msgrcv, &ru->ru_msgrcv) ||
328 __put_user(r->ru_nsignals, &ru->ru_nsignals) ||
329 __put_user(r->ru_nvcsw, &ru->ru_nvcsw) ||
330 __put_user(r->ru_nivcsw, &ru->ru_nivcsw))
335 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru)
339 mm_segment_t old_fs = get_fs();
342 ret = sys_getrusage(who, &r);
348 if (put_compat_rusage(ru, &r))
355 compat_sys_wait4(compat_pid_t pid, compat_uint_t __user *stat_addr, int options,
356 struct compat_rusage __user *ru)
359 return sys_wait4(pid, stat_addr, options, NULL);
364 mm_segment_t old_fs = get_fs();
367 ret = sys_wait4(pid, stat_addr ? &status : NULL, options, &r);
371 if (put_compat_rusage(ru, &r))
373 if (stat_addr && put_user(status, stat_addr))
380 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
382 compat_ulong_t __user *user_mask_ptr)
384 unsigned long kernel_mask;
388 if (get_user(kernel_mask, user_mask_ptr))
393 ret = sys_sched_setaffinity(pid,
401 asmlinkage int compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len,
402 compat_ulong_t __user *user_mask_ptr)
404 unsigned long kernel_mask;
410 ret = sys_sched_getaffinity(pid,
416 ret = sizeof(compat_ulong_t);
417 if (put_user(kernel_mask, user_mask_ptr))
424 static int get_compat_itimerspec(struct itimerspec *dst,
425 struct compat_itimerspec __user *src)
427 if (get_compat_timespec(&dst->it_interval, &src->it_interval) ||
428 get_compat_timespec(&dst->it_value, &src->it_value))
433 static int put_compat_itimerspec(struct compat_itimerspec __user *dst,
434 struct itimerspec *src)
436 if (put_compat_timespec(&src->it_interval, &dst->it_interval) ||
437 put_compat_timespec(&src->it_value, &dst->it_value))
442 long compat_timer_settime(timer_t timer_id, int flags,
443 struct compat_itimerspec __user *new,
444 struct compat_itimerspec __user *old)
448 struct itimerspec newts, oldts;
452 if (get_compat_itimerspec(&newts, new))
456 err = sys_timer_settime(timer_id, flags, &newts, &oldts);
458 if (!err && old && put_compat_itimerspec(old, &oldts))
463 long compat_timer_gettime(timer_t timer_id,
464 struct compat_itimerspec __user *setting)
468 struct itimerspec ts;
471 err = sys_timer_gettime(timer_id, &ts);
473 if (!err && put_compat_itimerspec(setting, &ts))
478 long compat_clock_settime(clockid_t which_clock,
479 struct compat_timespec __user *tp)
484 if (get_compat_timespec(&ts, tp))
488 err = sys_clock_settime(which_clock, &ts);
493 long compat_clock_gettime(clockid_t which_clock,
494 struct compat_timespec __user *tp)
501 err = sys_clock_gettime(which_clock, &ts);
503 if (!err && put_compat_timespec(&ts, tp))
508 long compat_clock_getres(clockid_t which_clock,
509 struct compat_timespec __user *tp)
516 err = sys_clock_getres(which_clock, &ts);
518 if (!err && put_compat_timespec(&ts, tp))
523 long compat_clock_nanosleep(clockid_t which_clock, int flags,
524 struct compat_timespec __user *rqtp,
525 struct compat_timespec __user *rmtp)
529 struct timespec in, out;
530 if (get_compat_timespec(&in, rqtp))
534 err = sys_clock_nanosleep(which_clock, flags, &in, &out);
536 if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
537 put_compat_timespec(&out, rmtp))
542 /* timer_create is architecture specific because it needs sigevent conversion */