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[/] [or1k_soc_on_altera_embedded_dev_kit/] [tags/] [linux-2.6/] [linux-2.6.24_orig/] [kernel/] [compat.c] - Blame information for rev 8

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Line No. Rev Author Line
1 3 xianfeng 
/*
2 
 *  linux/kernel/compat.c
3 
 *
4 
 *  Kernel compatibililty routines for e.g. 32 bit syscall support
5 
 *  on 64 bit kernels.
6 
 *
7 
 *  Copyright (C) 2002-2003 Stephen Rothwell, IBM Corporation
8 
 *
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.
12 
 */
13 
 
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/syscalls.h>
21 
#include <linux/unistd.h>
22 
#include <linux/security.h>
23 
#include <linux/timex.h>
24 
#include <linux/migrate.h>
25 
#include <linux/posix-timers.h>
26 
 
27 
#include <asm/uaccess.h>
28 
 
29 
int get_compat_timespec(struct timespec *ts, const struct compat_timespec __user *cts)
30 
{
31 
        return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) ||
32 
                        __get_user(ts->tv_sec, &cts->tv_sec) ||
33 
                        __get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
34 
}
35 
 
36 
int put_compat_timespec(const struct timespec *ts, struct compat_timespec __user *cts)
37 
{
38 
        return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) ||
39 
                        __put_user(ts->tv_sec, &cts->tv_sec) ||
40 
                        __put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
41 
}
42 
 
43 
asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp,
44 
                                     struct compat_timespec __user *rmtp)
45 
{
46 
        struct timespec tu, rmt;
47 
        long ret;
48 
 
49 
        if (get_compat_timespec(&tu, rqtp))
50 
                return -EFAULT;
51 
 
52 
        if (!timespec_valid(&tu))
53 
                return -EINVAL;
54 
 
55 
        ret = hrtimer_nanosleep(&tu, rmtp ? &rmt : NULL, HRTIMER_MODE_REL,
56 
                                CLOCK_MONOTONIC);
57 
 
58 
        if (ret && rmtp) {
59 
                if (put_compat_timespec(&rmt, rmtp))
60 
                        return -EFAULT;
61 
        }
62 
 
63 
        return ret;
64 
}
65 
 
66 
static inline long get_compat_itimerval(struct itimerval *o,
67 
                struct compat_itimerval __user *i)
68 
{
69 
        return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
70 
                (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |
71 
                 __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |
72 
                 __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |
73 
                 __get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));
74 
}
75 
 
76 
static inline long put_compat_itimerval(struct compat_itimerval __user *o,
77 
                struct itimerval *i)
78 
{
79 
        return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
80 
                (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |
81 
                 __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |
82 
                 __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |
83 
                 __put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));
84 
}
85 
 
86 
asmlinkage long compat_sys_getitimer(int which,
87 
                struct compat_itimerval __user *it)
88 
{
89 
        struct itimerval kit;
90 
        int error;
91 
 
92 
        error = do_getitimer(which, &kit);
93 
        if (!error && put_compat_itimerval(it, &kit))
94 
                error = -EFAULT;
95 
        return error;
96 
}
97 
 
98 
asmlinkage long compat_sys_setitimer(int which,
99 
                struct compat_itimerval __user *in,
100 
                struct compat_itimerval __user *out)
101 
{
102 
        struct itimerval kin, kout;
103 
        int error;
104 
 
105 
        if (in) {
106 
                if (get_compat_itimerval(&kin, in))
107 
                        return -EFAULT;
108 
        } else
109 
                memset(&kin, 0, sizeof(kin));
110 
 
111 
        error = do_setitimer(which, &kin, out ? &kout : NULL);
112 
        if (error || !out)
113 
                return error;
114 
        if (put_compat_itimerval(out, &kout))
115 
                return -EFAULT;
116 
        return 0;
117 
}
118 
 
119 
asmlinkage long compat_sys_times(struct compat_tms __user *tbuf)
120 
{
121 
        /*
122 
         *      In the SMP world we might just be unlucky and have one of
123 
         *      the times increment as we use it. Since the value is an
124 
         *      atomically safe type this is just fine. Conceptually its
125 
         *      as if the syscall took an instant longer to occur.
126 
         */
127 
        if (tbuf) {
128 
                struct compat_tms tmp;
129 
                struct task_struct *tsk = current;
130 
                struct task_struct *t;
131 
                cputime_t utime, stime, cutime, cstime;
132 
 
133 
                read_lock(&tasklist_lock);
134 
                utime = tsk->signal->utime;
135 
                stime = tsk->signal->stime;
136 
                t = tsk;
137 
                do {
138 
                        utime = cputime_add(utime, t->utime);
139 
                        stime = cputime_add(stime, t->stime);
140 
                        t = next_thread(t);
141 
                } while (t != tsk);
142 
 
143 
                /*
144 
                 * While we have tasklist_lock read-locked, no dying thread
145 
                 * can be updating current->signal->[us]time.  Instead,
146 
                 * we got their counts included in the live thread loop.
147 
                 * However, another thread can come in right now and
148 
                 * do a wait call that updates current->signal->c[us]time.
149 
                 * To make sure we always see that pair updated atomically,
150 
                 * we take the siglock around fetching them.
151 
                 */
152 
                spin_lock_irq(&tsk->sighand->siglock);
153 
                cutime = tsk->signal->cutime;
154 
                cstime = tsk->signal->cstime;
155 
                spin_unlock_irq(&tsk->sighand->siglock);
156 
                read_unlock(&tasklist_lock);
157 
 
158 
                tmp.tms_utime = compat_jiffies_to_clock_t(cputime_to_jiffies(utime));
159 
                tmp.tms_stime = compat_jiffies_to_clock_t(cputime_to_jiffies(stime));
160 
                tmp.tms_cutime = compat_jiffies_to_clock_t(cputime_to_jiffies(cutime));
161 
                tmp.tms_cstime = compat_jiffies_to_clock_t(cputime_to_jiffies(cstime));
162 
                if (copy_to_user(tbuf, &tmp, sizeof(tmp)))
163 
                        return -EFAULT;
164 
        }
165 
        return compat_jiffies_to_clock_t(jiffies);
166 
}
167 
 
168 
/*
169 
 * Assumption: old_sigset_t and compat_old_sigset_t are both
170 
 * types that can be passed to put_user()/get_user().
171 
 */
172 
 
173 
asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set)
174 
{
175 
        old_sigset_t s;
176 
        long ret;
177 
        mm_segment_t old_fs = get_fs();
178 
 
179 
        set_fs(KERNEL_DS);
180 
        ret = sys_sigpending((old_sigset_t __user *) &s);
181 
        set_fs(old_fs);
182 
        if (ret == 0)
183 
                ret = put_user(s, set);
184 
        return ret;
185 
}
186 
 
187 
asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *set,
188 
                compat_old_sigset_t __user *oset)
189 
{
190 
        old_sigset_t s;
191 
        long ret;
192 
        mm_segment_t old_fs;
193 
 
194 
        if (set && get_user(s, set))
195 
                return -EFAULT;
196 
        old_fs = get_fs();
197 
        set_fs(KERNEL_DS);
198 
        ret = sys_sigprocmask(how,
199 
                              set ? (old_sigset_t __user *) &s : NULL,
200 
                              oset ? (old_sigset_t __user *) &s : NULL);
201 
        set_fs(old_fs);
202 
        if (ret == 0)
203 
                if (oset)
204 
                        ret = put_user(s, oset);
205 
        return ret;
206 
}
207 
 
208 
asmlinkage long compat_sys_setrlimit(unsigned int resource,
209 
                struct compat_rlimit __user *rlim)
210 
{
211 
        struct rlimit r;
212 
        int ret;
213 
        mm_segment_t old_fs = get_fs ();
214 
 
215 
        if (resource >= RLIM_NLIMITS)
216 
                return -EINVAL;
217 
 
218 
        if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) ||
219 
            __get_user(r.rlim_cur, &rlim->rlim_cur) ||
220 
            __get_user(r.rlim_max, &rlim->rlim_max))
221 
                return -EFAULT;
222 
 
223 
        if (r.rlim_cur == COMPAT_RLIM_INFINITY)
224 
                r.rlim_cur = RLIM_INFINITY;
225 
        if (r.rlim_max == COMPAT_RLIM_INFINITY)
226 
                r.rlim_max = RLIM_INFINITY;
227 
        set_fs(KERNEL_DS);
228 
        ret = sys_setrlimit(resource, (struct rlimit __user *) &r);
229 
        set_fs(old_fs);
230 
        return ret;
231 
}
232 
 
233 
#ifdef COMPAT_RLIM_OLD_INFINITY
234 
 
235 
asmlinkage long compat_sys_old_getrlimit(unsigned int resource,
236 
                struct compat_rlimit __user *rlim)
237 
{
238 
        struct rlimit r;
239 
        int ret;
240 
        mm_segment_t old_fs = get_fs();
241 
 
242 
        set_fs(KERNEL_DS);
243 
        ret = sys_old_getrlimit(resource, &r);
244 
        set_fs(old_fs);
245 
 
246 
        if (!ret) {
247 
                if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY)
248 
                        r.rlim_cur = COMPAT_RLIM_INFINITY;
249 
                if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY)
250 
                        r.rlim_max = COMPAT_RLIM_INFINITY;
251 
 
252 
                if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
253 
                    __put_user(r.rlim_cur, &rlim->rlim_cur) ||
254 
                    __put_user(r.rlim_max, &rlim->rlim_max))
255 
                        return -EFAULT;
256 
        }
257 
        return ret;
258 
}
259 
 
260 
#endif
261 
 
262 
asmlinkage long compat_sys_getrlimit (unsigned int resource,
263 
                struct compat_rlimit __user *rlim)
264 
{
265 
        struct rlimit r;
266 
        int ret;
267 
        mm_segment_t old_fs = get_fs();
268 
 
269 
        set_fs(KERNEL_DS);
270 
        ret = sys_getrlimit(resource, (struct rlimit __user *) &r);
271 
        set_fs(old_fs);
272 
        if (!ret) {
273 
                if (r.rlim_cur > COMPAT_RLIM_INFINITY)
274 
                        r.rlim_cur = COMPAT_RLIM_INFINITY;
275 
                if (r.rlim_max > COMPAT_RLIM_INFINITY)
276 
                        r.rlim_max = COMPAT_RLIM_INFINITY;
277 
 
278 
                if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
279 
                    __put_user(r.rlim_cur, &rlim->rlim_cur) ||
280 
                    __put_user(r.rlim_max, &rlim->rlim_max))
281 
                        return -EFAULT;
282 
        }
283 
        return ret;
284 
}
285 
 
286 
int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru)
287 
{
288 
        if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) ||
289 
            __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) ||
290 
            __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) ||
291 
            __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) ||
292 
            __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) ||
293 
            __put_user(r->ru_maxrss, &ru->ru_maxrss) ||
294 
            __put_user(r->ru_ixrss, &ru->ru_ixrss) ||
295 
            __put_user(r->ru_idrss, &ru->ru_idrss) ||
296 
            __put_user(r->ru_isrss, &ru->ru_isrss) ||
297 
            __put_user(r->ru_minflt, &ru->ru_minflt) ||
298 
            __put_user(r->ru_majflt, &ru->ru_majflt) ||
299 
            __put_user(r->ru_nswap, &ru->ru_nswap) ||
300 
            __put_user(r->ru_inblock, &ru->ru_inblock) ||
301 
            __put_user(r->ru_oublock, &ru->ru_oublock) ||
302 
            __put_user(r->ru_msgsnd, &ru->ru_msgsnd) ||
303 
            __put_user(r->ru_msgrcv, &ru->ru_msgrcv) ||
304 
            __put_user(r->ru_nsignals, &ru->ru_nsignals) ||
305 
            __put_user(r->ru_nvcsw, &ru->ru_nvcsw) ||
306 
            __put_user(r->ru_nivcsw, &ru->ru_nivcsw))
307 
                return -EFAULT;
308 
        return 0;
309 
}
310 
 
311 
asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru)
312 
{
313 
        struct rusage r;
314 
        int ret;
315 
        mm_segment_t old_fs = get_fs();
316 
 
317 
        set_fs(KERNEL_DS);
318 
        ret = sys_getrusage(who, (struct rusage __user *) &r);
319 
        set_fs(old_fs);
320 
 
321 
        if (ret)
322 
                return ret;
323 
 
324 
        if (put_compat_rusage(&r, ru))
325 
                return -EFAULT;
326 
 
327 
        return 0;
328 
}
329 
 
330 
asmlinkage long
331 
compat_sys_wait4(compat_pid_t pid, compat_uint_t __user *stat_addr, int options,
332 
        struct compat_rusage __user *ru)
333 
{
334 
        if (!ru) {
335 
                return sys_wait4(pid, stat_addr, options, NULL);
336 
        } else {
337 
                struct rusage r;
338 
                int ret;
339 
                unsigned int status;
340 
                mm_segment_t old_fs = get_fs();
341 
 
342 
                set_fs (KERNEL_DS);
343 
                ret = sys_wait4(pid,
344 
                                (stat_addr ?
345 
                                 (unsigned int __user *) &status : NULL),
346 
                                options, (struct rusage __user *) &r);
347 
                set_fs (old_fs);
348 
 
349 
                if (ret > 0) {
350 
                        if (put_compat_rusage(&r, ru))
351 
                                return -EFAULT;
352 
                        if (stat_addr && put_user(status, stat_addr))
353 
                                return -EFAULT;
354 
                }
355 
                return ret;
356 
        }
357 
}
358 
 
359 
asmlinkage long compat_sys_waitid(int which, compat_pid_t pid,
360 
                struct compat_siginfo __user *uinfo, int options,
361 
                struct compat_rusage __user *uru)
362 
{
363 
        siginfo_t info;
364 
        struct rusage ru;
365 
        long ret;
366 
        mm_segment_t old_fs = get_fs();
367 
 
368 
        memset(&info, 0, sizeof(info));
369 
 
370 
        set_fs(KERNEL_DS);
371 
        ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options,
372 
                         uru ? (struct rusage __user *)&ru : NULL);
373 
        set_fs(old_fs);
374 
 
375 
        if ((ret < 0) || (info.si_signo == 0))
376 
                return ret;
377 
 
378 
        if (uru) {
379 
                ret = put_compat_rusage(&ru, uru);
380 
                if (ret)
381 
                        return ret;
382 
        }
383 
 
384 
        BUG_ON(info.si_code & __SI_MASK);
385 
        info.si_code |= __SI_CHLD;
386 
        return copy_siginfo_to_user32(uinfo, &info);
387 
}
388 
 
389 
static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
390 
                                    unsigned len, cpumask_t *new_mask)
391 
{
392 
        unsigned long *k;
393 
 
394 
        if (len < sizeof(cpumask_t))
395 
                memset(new_mask, 0, sizeof(cpumask_t));
396 
        else if (len > sizeof(cpumask_t))
397 
                len = sizeof(cpumask_t);
398 
 
399 
        k = cpus_addr(*new_mask);
400 
        return compat_get_bitmap(k, user_mask_ptr, len * 8);
401 
}
402 
 
403 
asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
404 
                                             unsigned int len,
405 
                                             compat_ulong_t __user *user_mask_ptr)
406 
{
407 
        cpumask_t new_mask;
408 
        int retval;
409 
 
410 
        retval = compat_get_user_cpu_mask(user_mask_ptr, len, &new_mask);
411 
        if (retval)
412 
                return retval;
413 
 
414 
        return sched_setaffinity(pid, new_mask);
415 
}
416 
 
417 
asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len,
418 
                                             compat_ulong_t __user *user_mask_ptr)
419 
{
420 
        int ret;
421 
        cpumask_t mask;
422 
        unsigned long *k;
423 
        unsigned int min_length = sizeof(cpumask_t);
424 
 
425 
        if (NR_CPUS <= BITS_PER_COMPAT_LONG)
426 
                min_length = sizeof(compat_ulong_t);
427 
 
428 
        if (len < min_length)
429 
                return -EINVAL;
430 
 
431 
        ret = sched_getaffinity(pid, &mask);
432 
        if (ret < 0)
433 
                return ret;
434 
 
435 
        k = cpus_addr(mask);
436 
        ret = compat_put_bitmap(user_mask_ptr, k, min_length * 8);
437 
        if (ret)
438 
                return ret;
439 
 
440 
        return min_length;
441 
}
442 
 
443 
int get_compat_itimerspec(struct itimerspec *dst,
444 
                          const struct compat_itimerspec __user *src)
445 
{
446 
        if (get_compat_timespec(&dst->it_interval, &src->it_interval) ||
447 
            get_compat_timespec(&dst->it_value, &src->it_value))
448 
                return -EFAULT;
449 
        return 0;
450 
}
451 
 
452 
int put_compat_itimerspec(struct compat_itimerspec __user *dst,
453 
                          const struct itimerspec *src)
454 
{
455 
        if (put_compat_timespec(&src->it_interval, &dst->it_interval) ||
456 
            put_compat_timespec(&src->it_value, &dst->it_value))
457 
                return -EFAULT;
458 
        return 0;
459 
}
460 
 
461 
long compat_sys_timer_create(clockid_t which_clock,
462 
                        struct compat_sigevent __user *timer_event_spec,
463 
                        timer_t __user *created_timer_id)
464 
{
465 
        struct sigevent __user *event = NULL;
466 
 
467 
        if (timer_event_spec) {
468 
                struct sigevent kevent;
469 
 
470 
                event = compat_alloc_user_space(sizeof(*event));
471 
                if (get_compat_sigevent(&kevent, timer_event_spec) ||
472 
                    copy_to_user(event, &kevent, sizeof(*event)))
473 
                        return -EFAULT;
474 
        }
475 
 
476 
        return sys_timer_create(which_clock, event, created_timer_id);
477 
}
478 
 
479 
long compat_sys_timer_settime(timer_t timer_id, int flags,
480 
                          struct compat_itimerspec __user *new,
481 
                          struct compat_itimerspec __user *old)
482 
{
483 
        long err;
484 
        mm_segment_t oldfs;
485 
        struct itimerspec newts, oldts;
486 
 
487 
        if (!new)
488 
                return -EINVAL;
489 
        if (get_compat_itimerspec(&newts, new))
490 
                return -EFAULT;
491 
        oldfs = get_fs();
492 
        set_fs(KERNEL_DS);
493 
        err = sys_timer_settime(timer_id, flags,
494 
                                (struct itimerspec __user *) &newts,
495 
                                (struct itimerspec __user *) &oldts);
496 
        set_fs(oldfs);
497 
        if (!err && old && put_compat_itimerspec(old, &oldts))
498 
                return -EFAULT;
499 
        return err;
500 
}
501 
 
502 
long compat_sys_timer_gettime(timer_t timer_id,
503 
                struct compat_itimerspec __user *setting)
504 
{
505 
        long err;
506 
        mm_segment_t oldfs;
507 
        struct itimerspec ts;
508 
 
509 
        oldfs = get_fs();
510 
        set_fs(KERNEL_DS);
511 
        err = sys_timer_gettime(timer_id,
512 
                                (struct itimerspec __user *) &ts);
513 
        set_fs(oldfs);
514 
        if (!err && put_compat_itimerspec(setting, &ts))
515 
                return -EFAULT;
516 
        return err;
517 
}
518 
 
519 
long compat_sys_clock_settime(clockid_t which_clock,
520 
                struct compat_timespec __user *tp)
521 
{
522 
        long err;
523 
        mm_segment_t oldfs;
524 
        struct timespec ts;
525 
 
526 
        if (get_compat_timespec(&ts, tp))
527 
                return -EFAULT;
528 
        oldfs = get_fs();
529 
        set_fs(KERNEL_DS);
530 
        err = sys_clock_settime(which_clock,
531 
                                (struct timespec __user *) &ts);
532 
        set_fs(oldfs);
533 
        return err;
534 
}
535 
 
536 
long compat_sys_clock_gettime(clockid_t which_clock,
537 
                struct compat_timespec __user *tp)
538 
{
539 
        long err;
540 
        mm_segment_t oldfs;
541 
        struct timespec ts;
542 
 
543 
        oldfs = get_fs();
544 
        set_fs(KERNEL_DS);
545 
        err = sys_clock_gettime(which_clock,
546 
                                (struct timespec __user *) &ts);
547 
        set_fs(oldfs);
548 
        if (!err && put_compat_timespec(&ts, tp))
549 
                return -EFAULT;
550 
        return err;
551 
}
552 
 
553 
long compat_sys_clock_getres(clockid_t which_clock,
554 
                struct compat_timespec __user *tp)
555 
{
556 
        long err;
557 
        mm_segment_t oldfs;
558 
        struct timespec ts;
559 
 
560 
        oldfs = get_fs();
561 
        set_fs(KERNEL_DS);
562 
        err = sys_clock_getres(which_clock,
563 
                               (struct timespec __user *) &ts);
564 
        set_fs(oldfs);
565 
        if (!err && tp && put_compat_timespec(&ts, tp))
566 
                return -EFAULT;
567 
        return err;
568 
}
569 
 
570 
static long compat_clock_nanosleep_restart(struct restart_block *restart)
571 
{
572 
        long err;
573 
        mm_segment_t oldfs;
574 
        struct timespec tu;
575 
        struct compat_timespec *rmtp = (struct compat_timespec *)(restart->arg1);
576 
 
577 
        restart->arg1 = (unsigned long) &tu;
578 
        oldfs = get_fs();
579 
        set_fs(KERNEL_DS);
580 
        err = clock_nanosleep_restart(restart);
581 
        set_fs(oldfs);
582 
 
583 
        if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
584 
            put_compat_timespec(&tu, rmtp))
585 
                return -EFAULT;
586 
 
587 
        if (err == -ERESTART_RESTARTBLOCK) {
588 
                restart->fn = compat_clock_nanosleep_restart;
589 
                restart->arg1 = (unsigned long) rmtp;
590 
        }
591 
        return err;
592 
}
593 
 
594 
long compat_sys_clock_nanosleep(clockid_t which_clock, int flags,
595 
                            struct compat_timespec __user *rqtp,
596 
                            struct compat_timespec __user *rmtp)
597 
{
598 
        long err;
599 
        mm_segment_t oldfs;
600 
        struct timespec in, out;
601 
        struct restart_block *restart;
602 
 
603 
        if (get_compat_timespec(&in, rqtp))
604 
                return -EFAULT;
605 
 
606 
        oldfs = get_fs();
607 
        set_fs(KERNEL_DS);
608 
        err = sys_clock_nanosleep(which_clock, flags,
609 
                                  (struct timespec __user *) &in,
610 
                                  (struct timespec __user *) &out);
611 
        set_fs(oldfs);
612 
 
613 
        if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
614 
            put_compat_timespec(&out, rmtp))
615 
                return -EFAULT;
616 
 
617 
        if (err == -ERESTART_RESTARTBLOCK) {
618 
                restart = &current_thread_info()->restart_block;
619 
                restart->fn = compat_clock_nanosleep_restart;
620 
                restart->arg1 = (unsigned long) rmtp;
621 
        }
622 
        return err;
623 
}
624 
 
625 
/*
626 
 * We currently only need the following fields from the sigevent
627 
 * structure: sigev_value, sigev_signo, sig_notify and (sometimes
628 
 * sigev_notify_thread_id).  The others are handled in user mode.
629 
 * We also assume that copying sigev_value.sival_int is sufficient
630 
 * to keep all the bits of sigev_value.sival_ptr intact.
631 
 */
632 
int get_compat_sigevent(struct sigevent *event,
633 
                const struct compat_sigevent __user *u_event)
634 
{
635 
        memset(event, 0, sizeof(*event));
636 
        return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) ||
637 
                __get_user(event->sigev_value.sival_int,
638 
                        &u_event->sigev_value.sival_int) ||
639 
                __get_user(event->sigev_signo, &u_event->sigev_signo) ||
640 
                __get_user(event->sigev_notify, &u_event->sigev_notify) ||
641 
                __get_user(event->sigev_notify_thread_id,
642 
                        &u_event->sigev_notify_thread_id))
643 
                ? -EFAULT : 0;
644 
}
645 
 
646 
long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
647 
                       unsigned long bitmap_size)
648 
{
649 
        int i, j;
650 
        unsigned long m;
651 
        compat_ulong_t um;
652 
        unsigned long nr_compat_longs;
653 
 
654 
        /* align bitmap up to nearest compat_long_t boundary */
655 
        bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
656 
 
657 
        if (!access_ok(VERIFY_READ, umask, bitmap_size / 8))
658 
                return -EFAULT;
659 
 
660 
        nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
661 
 
662 
        for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
663 
                m = 0;
664 
 
665 
                for (j = 0; j < sizeof(m)/sizeof(um); j++) {
666 
                        /*
667 
                         * We dont want to read past the end of the userspace
668 
                         * bitmap. We must however ensure the end of the
669 
                         * kernel bitmap is zeroed.
670 
                         */
671 
                        if (nr_compat_longs-- > 0) {
672 
                                if (__get_user(um, umask))
673 
                                        return -EFAULT;
674 
                        } else {
675 
                                um = 0;
676 
                        }
677 
 
678 
                        umask++;
679 
                        m |= (long)um << (j * BITS_PER_COMPAT_LONG);
680 
                }
681 
                *mask++ = m;
682 
        }
683 
 
684 
        return 0;
685 
}
686 
 
687 
long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
688 
                       unsigned long bitmap_size)
689 
{
690 
        int i, j;
691 
        unsigned long m;
692 
        compat_ulong_t um;
693 
        unsigned long nr_compat_longs;
694 
 
695 
        /* align bitmap up to nearest compat_long_t boundary */
696 
        bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
697 
 
698 
        if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8))
699 
                return -EFAULT;
700 
 
701 
        nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
702 
 
703 
        for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
704 
                m = *mask++;
705 
 
706 
                for (j = 0; j < sizeof(m)/sizeof(um); j++) {
707 
                        um = m;
708 
 
709 
                        /*
710 
                         * We dont want to write past the end of the userspace
711 
                         * bitmap.
712 
                         */
713 
                        if (nr_compat_longs-- > 0) {
714 
                                if (__put_user(um, umask))
715 
                                        return -EFAULT;
716 
                        }
717 
 
718 
                        umask++;
719 
                        m >>= 4*sizeof(um);
720 
                        m >>= 4*sizeof(um);
721 
                }
722 
        }
723 
 
724 
        return 0;
725 
}
726 
 
727 
void
728 
sigset_from_compat (sigset_t *set, compat_sigset_t *compat)
729 
{
730 
        switch (_NSIG_WORDS) {
731 
        case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 );
732 
        case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 );
733 
        case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 );
734 
        case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 );
735 
        }
736 
}
737 
 
738 
asmlinkage long
739 
compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese,
740 
                struct compat_siginfo __user *uinfo,
741 
                struct compat_timespec __user *uts, compat_size_t sigsetsize)
742 
{
743 
        compat_sigset_t s32;
744 
        sigset_t s;
745 
        int sig;
746 
        struct timespec t;
747 
        siginfo_t info;
748 
        long ret, timeout = 0;
749 
 
750 
        if (sigsetsize != sizeof(sigset_t))
751 
                return -EINVAL;
752 
 
753 
        if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t)))
754 
                return -EFAULT;
755 
        sigset_from_compat(&s, &s32);
756 
        sigdelsetmask(&s,sigmask(SIGKILL)|sigmask(SIGSTOP));
757 
        signotset(&s);
758 
 
759 
        if (uts) {
760 
                if (get_compat_timespec (&t, uts))
761 
                        return -EFAULT;
762 
                if (t.tv_nsec >= 1000000000L || t.tv_nsec < 0
763 
                                || t.tv_sec < 0)
764 
                        return -EINVAL;
765 
        }
766 
 
767 
        spin_lock_irq(&current->sighand->siglock);
768 
        sig = dequeue_signal(current, &s, &info);
769 
        if (!sig) {
770 
                timeout = MAX_SCHEDULE_TIMEOUT;
771 
                if (uts)
772 
                        timeout = timespec_to_jiffies(&t)
773 
                                +(t.tv_sec || t.tv_nsec);
774 
                if (timeout) {
775 
                        current->real_blocked = current->blocked;
776 
                        sigandsets(&current->blocked, &current->blocked, &s);
777 
 
778 
                        recalc_sigpending();
779 
                        spin_unlock_irq(&current->sighand->siglock);
780 
 
781 
                        timeout = schedule_timeout_interruptible(timeout);
782 
 
783 
                        spin_lock_irq(&current->sighand->siglock);
784 
                        sig = dequeue_signal(current, &s, &info);
785 
                        current->blocked = current->real_blocked;
786 
                        siginitset(&current->real_blocked, 0);
787 
                        recalc_sigpending();
788 
                }
789 
        }
790 
        spin_unlock_irq(&current->sighand->siglock);
791 
 
792 
        if (sig) {
793 
                ret = sig;
794 
                if (uinfo) {
795 
                        if (copy_siginfo_to_user32(uinfo, &info))
796 
                                ret = -EFAULT;
797 
                }
798 
        }else {
799 
                ret = timeout?-EINTR:-EAGAIN;
800 
        }
801 
        return ret;
802 
 
803 
}
804 
 
805 
#ifdef __ARCH_WANT_COMPAT_SYS_TIME
806 
 
807 
/* compat_time_t is a 32 bit "long" and needs to get converted. */
808 
 
809 
asmlinkage long compat_sys_time(compat_time_t __user * tloc)
810 
{
811 
        compat_time_t i;
812 
        struct timeval tv;
813 
 
814 
        do_gettimeofday(&tv);
815 
        i = tv.tv_sec;
816 
 
817 
        if (tloc) {
818 
                if (put_user(i,tloc))
819 
                        i = -EFAULT;
820 
        }
821 
        return i;
822 
}
823 
 
824 
asmlinkage long compat_sys_stime(compat_time_t __user *tptr)
825 
{
826 
        struct timespec tv;
827 
        int err;
828 
 
829 
        if (get_user(tv.tv_sec, tptr))
830 
                return -EFAULT;
831 
 
832 
        tv.tv_nsec = 0;
833 
 
834 
        err = security_settime(&tv, NULL);
835 
        if (err)
836 
                return err;
837 
 
838 
        do_settimeofday(&tv);
839 
        return 0;
840 
}
841 
 
842 
#endif /* __ARCH_WANT_COMPAT_SYS_TIME */
843 
 
844 
#ifdef __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND
845 
asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset, compat_size_t sigsetsize)
846 
{
847 
        sigset_t newset;
848 
        compat_sigset_t newset32;
849 
 
850 
        /* XXX: Don't preclude handling different sized sigset_t's.  */
851 
        if (sigsetsize != sizeof(sigset_t))
852 
                return -EINVAL;
853 
 
854 
        if (copy_from_user(&newset32, unewset, sizeof(compat_sigset_t)))
855 
                return -EFAULT;
856 
        sigset_from_compat(&newset, &newset32);
857 
        sigdelsetmask(&newset, sigmask(SIGKILL)|sigmask(SIGSTOP));
858 
 
859 
        spin_lock_irq(&current->sighand->siglock);
860 
        current->saved_sigmask = current->blocked;
861 
        current->blocked = newset;
862 
        recalc_sigpending();
863 
        spin_unlock_irq(&current->sighand->siglock);
864 
 
865 
        current->state = TASK_INTERRUPTIBLE;
866 
        schedule();
867 
        set_thread_flag(TIF_RESTORE_SIGMASK);
868 
        return -ERESTARTNOHAND;
869 
}
870 
#endif /* __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND */
871 
 
872 
asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp)
873 
{
874 
        struct timex txc;
875 
        int ret;
876 
 
877 
        memset(&txc, 0, sizeof(struct timex));
878 
 
879 
        if (!access_ok(VERIFY_READ, utp, sizeof(struct compat_timex)) ||
880 
                        __get_user(txc.modes, &utp->modes) ||
881 
                        __get_user(txc.offset, &utp->offset) ||
882 
                        __get_user(txc.freq, &utp->freq) ||
883 
                        __get_user(txc.maxerror, &utp->maxerror) ||
884 
                        __get_user(txc.esterror, &utp->esterror) ||
885 
                        __get_user(txc.status, &utp->status) ||
886 
                        __get_user(txc.constant, &utp->constant) ||
887 
                        __get_user(txc.precision, &utp->precision) ||
888 
                        __get_user(txc.tolerance, &utp->tolerance) ||
889 
                        __get_user(txc.time.tv_sec, &utp->time.tv_sec) ||
890 
                        __get_user(txc.time.tv_usec, &utp->time.tv_usec) ||
891 
                        __get_user(txc.tick, &utp->tick) ||
892 
                        __get_user(txc.ppsfreq, &utp->ppsfreq) ||
893 
                        __get_user(txc.jitter, &utp->jitter) ||
894 
                        __get_user(txc.shift, &utp->shift) ||
895 
                        __get_user(txc.stabil, &utp->stabil) ||
896 
                        __get_user(txc.jitcnt, &utp->jitcnt) ||
897 
                        __get_user(txc.calcnt, &utp->calcnt) ||
898 
                        __get_user(txc.errcnt, &utp->errcnt) ||
899 
                        __get_user(txc.stbcnt, &utp->stbcnt))
900 
                return -EFAULT;
901 
 
902 
        ret = do_adjtimex(&txc);
903 
 
904 
        if (!access_ok(VERIFY_WRITE, utp, sizeof(struct compat_timex)) ||
905 
                        __put_user(txc.modes, &utp->modes) ||
906 
                        __put_user(txc.offset, &utp->offset) ||
907 
                        __put_user(txc.freq, &utp->freq) ||
908 
                        __put_user(txc.maxerror, &utp->maxerror) ||
909 
                        __put_user(txc.esterror, &utp->esterror) ||
910 
                        __put_user(txc.status, &utp->status) ||
911 
                        __put_user(txc.constant, &utp->constant) ||
912 
                        __put_user(txc.precision, &utp->precision) ||
913 
                        __put_user(txc.tolerance, &utp->tolerance) ||
914 
                        __put_user(txc.time.tv_sec, &utp->time.tv_sec) ||
915 
                        __put_user(txc.time.tv_usec, &utp->time.tv_usec) ||
916 
                        __put_user(txc.tick, &utp->tick) ||
917 
                        __put_user(txc.ppsfreq, &utp->ppsfreq) ||
918 
                        __put_user(txc.jitter, &utp->jitter) ||
919 
                        __put_user(txc.shift, &utp->shift) ||
920 
                        __put_user(txc.stabil, &utp->stabil) ||
921 
                        __put_user(txc.jitcnt, &utp->jitcnt) ||
922 
                        __put_user(txc.calcnt, &utp->calcnt) ||
923 
                        __put_user(txc.errcnt, &utp->errcnt) ||
924 
                        __put_user(txc.stbcnt, &utp->stbcnt))
925 
                ret = -EFAULT;
926 
 
927 
        return ret;
928 
}
929 
 
930 
#ifdef CONFIG_NUMA
931 
asmlinkage long compat_sys_move_pages(pid_t pid, unsigned long nr_pages,
932 
                compat_uptr_t __user *pages32,
933 
                const int __user *nodes,
934 
                int __user *status,
935 
                int flags)
936 
{
937 
        const void __user * __user *pages;
938 
        int i;
939 
 
940 
        pages = compat_alloc_user_space(nr_pages * sizeof(void *));
941 
        for (i = 0; i < nr_pages; i++) {
942 
                compat_uptr_t p;
943 
 
944 
                if (get_user(p, pages32 + i) ||
945 
                        put_user(compat_ptr(p), pages + i))
946 
                        return -EFAULT;
947 
        }
948 
        return sys_move_pages(pid, nr_pages, pages, nodes, status, flags);
949 
}
950 
 
951 
asmlinkage long compat_sys_migrate_pages(compat_pid_t pid,
952 
                        compat_ulong_t maxnode,
953 
                        const compat_ulong_t __user *old_nodes,
954 
                        const compat_ulong_t __user *new_nodes)
955 
{
956 
        unsigned long __user *old = NULL;
957 
        unsigned long __user *new = NULL;
958 
        nodemask_t tmp_mask;
959 
        unsigned long nr_bits;
960 
        unsigned long size;
961 
 
962 
        nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES);
963 
        size = ALIGN(nr_bits, BITS_PER_LONG) / 8;
964 
        if (old_nodes) {
965 
                if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits))
966 
                        return -EFAULT;
967 
                old = compat_alloc_user_space(new_nodes ? size * 2 : size);
968 
                if (new_nodes)
969 
                        new = old + size / sizeof(unsigned long);
970 
                if (copy_to_user(old, nodes_addr(tmp_mask), size))
971 
                        return -EFAULT;
972 
        }
973 
        if (new_nodes) {
974 
                if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits))
975 
                        return -EFAULT;
976 
                if (new == NULL)
977 
                        new = compat_alloc_user_space(size);
978 
                if (copy_to_user(new, nodes_addr(tmp_mask), size))
979 
                        return -EFAULT;
980 
        }
981 
        return sys_migrate_pages(pid, nr_bits + 1, old, new);
982 
}
983 
#endif
984 
 
985 
struct compat_sysinfo {
986 
        s32 uptime;
987 
        u32 loads[3];
988 
        u32 totalram;
989 
        u32 freeram;
990 
        u32 sharedram;
991 
        u32 bufferram;
992 
        u32 totalswap;
993 
        u32 freeswap;
994 
        u16 procs;
995 
        u16 pad;
996 
        u32 totalhigh;
997 
        u32 freehigh;
998 
        u32 mem_unit;
999 
        char _f[20-2*sizeof(u32)-sizeof(int)];
1000 
};
1001 
 
1002 
asmlinkage long
1003 
compat_sys_sysinfo(struct compat_sysinfo __user *info)
1004 
{
1005 
        struct sysinfo s;
1006 
 
1007 
        do_sysinfo(&s);
1008 
 
1009 
        /* Check to see if any memory value is too large for 32-bit and scale
1010 
         *  down if needed
1011 
         */
1012 
        if ((s.totalram >> 32) || (s.totalswap >> 32)) {
1013 
                int bitcount = 0;
1014 
 
1015 
                while (s.mem_unit < PAGE_SIZE) {
1016 
                        s.mem_unit <<= 1;
1017 
                        bitcount++;
1018 
                }
1019 
 
1020 
                s.totalram >>= bitcount;
1021 
                s.freeram >>= bitcount;
1022 
                s.sharedram >>= bitcount;
1023 
                s.bufferram >>= bitcount;
1024 
                s.totalswap >>= bitcount;
1025 
                s.freeswap >>= bitcount;
1026 
                s.totalhigh >>= bitcount;
1027 
                s.freehigh >>= bitcount;
1028 
        }
1029 
 
1030 
        if (!access_ok(VERIFY_WRITE, info, sizeof(struct compat_sysinfo)) ||
1031 
            __put_user (s.uptime, &info->uptime) ||
1032 
            __put_user (s.loads[0], &info->loads[0]) ||
1033 
            __put_user (s.loads[1], &info->loads[1]) ||
1034 
            __put_user (s.loads[2], &info->loads[2]) ||
1035 
            __put_user (s.totalram, &info->totalram) ||
1036 
            __put_user (s.freeram, &info->freeram) ||
1037 
            __put_user (s.sharedram, &info->sharedram) ||
1038 
            __put_user (s.bufferram, &info->bufferram) ||
1039 
            __put_user (s.totalswap, &info->totalswap) ||
1040 
            __put_user (s.freeswap, &info->freeswap) ||
1041 
            __put_user (s.procs, &info->procs) ||
1042 
            __put_user (s.totalhigh, &info->totalhigh) ||
1043 
            __put_user (s.freehigh, &info->freehigh) ||
1044 
            __put_user (s.mem_unit, &info->mem_unit))
1045 
                return -EFAULT;
1046 
 
1047 
        return 0;
1048 
}
1049 
 

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