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1da177e4 LT |
1 | /* |
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 */ | |
1da177e4 LT |
20 | #include <linux/syscalls.h> |
21 | #include <linux/unistd.h> | |
22 | #include <linux/security.h> | |
3158e941 | 23 | #include <linux/timex.h> |
1da177e4 LT |
24 | |
25 | #include <asm/uaccess.h> | |
1da177e4 LT |
26 | |
27 | int get_compat_timespec(struct timespec *ts, const struct compat_timespec __user *cts) | |
28 | { | |
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; | |
32 | } | |
33 | ||
34 | int put_compat_timespec(const struct timespec *ts, struct compat_timespec __user *cts) | |
35 | { | |
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; | |
39 | } | |
40 | ||
41 | static long compat_nanosleep_restart(struct restart_block *restart) | |
42 | { | |
43 | unsigned long expire = restart->arg0, now = jiffies; | |
44 | struct compat_timespec __user *rmtp; | |
45 | ||
46 | /* Did it expire while we handled signals? */ | |
47 | if (!time_after(expire, now)) | |
48 | return 0; | |
49 | ||
75bcc8c5 | 50 | expire = schedule_timeout_interruptible(expire - now); |
1da177e4 LT |
51 | if (expire == 0) |
52 | return 0; | |
53 | ||
54 | rmtp = (struct compat_timespec __user *)restart->arg1; | |
55 | if (rmtp) { | |
56 | struct compat_timespec ct; | |
57 | struct timespec t; | |
58 | ||
59 | jiffies_to_timespec(expire, &t); | |
60 | ct.tv_sec = t.tv_sec; | |
61 | ct.tv_nsec = t.tv_nsec; | |
62 | if (copy_to_user(rmtp, &ct, sizeof(ct))) | |
63 | return -EFAULT; | |
64 | } | |
65 | /* The 'restart' block is already filled in */ | |
66 | return -ERESTART_RESTARTBLOCK; | |
67 | } | |
68 | ||
69 | asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp, | |
70 | struct compat_timespec __user *rmtp) | |
71 | { | |
72 | struct timespec t; | |
73 | struct restart_block *restart; | |
74 | unsigned long expire; | |
75 | ||
76 | if (get_compat_timespec(&t, rqtp)) | |
77 | return -EFAULT; | |
78 | ||
79 | if ((t.tv_nsec >= 1000000000L) || (t.tv_nsec < 0) || (t.tv_sec < 0)) | |
80 | return -EINVAL; | |
81 | ||
82 | expire = timespec_to_jiffies(&t) + (t.tv_sec || t.tv_nsec); | |
75bcc8c5 | 83 | expire = schedule_timeout_interruptible(expire); |
1da177e4 LT |
84 | if (expire == 0) |
85 | return 0; | |
86 | ||
87 | if (rmtp) { | |
88 | jiffies_to_timespec(expire, &t); | |
89 | if (put_compat_timespec(&t, rmtp)) | |
90 | return -EFAULT; | |
91 | } | |
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; | |
97 | } | |
98 | ||
99 | static inline long get_compat_itimerval(struct itimerval *o, | |
100 | struct compat_itimerval __user *i) | |
101 | { | |
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))); | |
107 | } | |
108 | ||
109 | static inline long put_compat_itimerval(struct compat_itimerval __user *o, | |
110 | struct itimerval *i) | |
111 | { | |
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))); | |
117 | } | |
118 | ||
119 | asmlinkage long compat_sys_getitimer(int which, | |
120 | struct compat_itimerval __user *it) | |
121 | { | |
122 | struct itimerval kit; | |
123 | int error; | |
124 | ||
125 | error = do_getitimer(which, &kit); | |
126 | if (!error && put_compat_itimerval(it, &kit)) | |
127 | error = -EFAULT; | |
128 | return error; | |
129 | } | |
130 | ||
131 | asmlinkage long compat_sys_setitimer(int which, | |
132 | struct compat_itimerval __user *in, | |
133 | struct compat_itimerval __user *out) | |
134 | { | |
135 | struct itimerval kin, kout; | |
136 | int error; | |
137 | ||
138 | if (in) { | |
139 | if (get_compat_itimerval(&kin, in)) | |
140 | return -EFAULT; | |
141 | } else | |
142 | memset(&kin, 0, sizeof(kin)); | |
143 | ||
144 | error = do_setitimer(which, &kin, out ? &kout : NULL); | |
145 | if (error || !out) | |
146 | return error; | |
147 | if (put_compat_itimerval(out, &kout)) | |
148 | return -EFAULT; | |
149 | return 0; | |
150 | } | |
151 | ||
152 | asmlinkage long compat_sys_times(struct compat_tms __user *tbuf) | |
153 | { | |
154 | /* | |
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. | |
159 | */ | |
160 | if (tbuf) { | |
161 | struct compat_tms tmp; | |
162 | struct task_struct *tsk = current; | |
163 | struct task_struct *t; | |
164 | cputime_t utime, stime, cutime, cstime; | |
165 | ||
166 | read_lock(&tasklist_lock); | |
167 | utime = tsk->signal->utime; | |
168 | stime = tsk->signal->stime; | |
169 | t = tsk; | |
170 | do { | |
171 | utime = cputime_add(utime, t->utime); | |
172 | stime = cputime_add(stime, t->stime); | |
173 | t = next_thread(t); | |
174 | } while (t != tsk); | |
175 | ||
176 | /* | |
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. | |
184 | */ | |
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); | |
190 | ||
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))) | |
196 | return -EFAULT; | |
197 | } | |
198 | return compat_jiffies_to_clock_t(jiffies); | |
199 | } | |
200 | ||
201 | /* | |
202 | * Assumption: old_sigset_t and compat_old_sigset_t are both | |
203 | * types that can be passed to put_user()/get_user(). | |
204 | */ | |
205 | ||
206 | asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set) | |
207 | { | |
208 | old_sigset_t s; | |
209 | long ret; | |
210 | mm_segment_t old_fs = get_fs(); | |
211 | ||
212 | set_fs(KERNEL_DS); | |
213 | ret = sys_sigpending((old_sigset_t __user *) &s); | |
214 | set_fs(old_fs); | |
215 | if (ret == 0) | |
216 | ret = put_user(s, set); | |
217 | return ret; | |
218 | } | |
219 | ||
220 | asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *set, | |
221 | compat_old_sigset_t __user *oset) | |
222 | { | |
223 | old_sigset_t s; | |
224 | long ret; | |
225 | mm_segment_t old_fs; | |
226 | ||
227 | if (set && get_user(s, set)) | |
228 | return -EFAULT; | |
229 | old_fs = get_fs(); | |
230 | set_fs(KERNEL_DS); | |
231 | ret = sys_sigprocmask(how, | |
232 | set ? (old_sigset_t __user *) &s : NULL, | |
233 | oset ? (old_sigset_t __user *) &s : NULL); | |
234 | set_fs(old_fs); | |
235 | if (ret == 0) | |
236 | if (oset) | |
237 | ret = put_user(s, oset); | |
238 | return ret; | |
239 | } | |
240 | ||
1da177e4 LT |
241 | asmlinkage long compat_sys_setrlimit(unsigned int resource, |
242 | struct compat_rlimit __user *rlim) | |
243 | { | |
244 | struct rlimit r; | |
245 | int ret; | |
246 | mm_segment_t old_fs = get_fs (); | |
247 | ||
248 | if (resource >= RLIM_NLIMITS) | |
249 | return -EINVAL; | |
250 | ||
251 | if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) || | |
252 | __get_user(r.rlim_cur, &rlim->rlim_cur) || | |
253 | __get_user(r.rlim_max, &rlim->rlim_max)) | |
254 | return -EFAULT; | |
255 | ||
256 | if (r.rlim_cur == COMPAT_RLIM_INFINITY) | |
257 | r.rlim_cur = RLIM_INFINITY; | |
258 | if (r.rlim_max == COMPAT_RLIM_INFINITY) | |
259 | r.rlim_max = RLIM_INFINITY; | |
260 | set_fs(KERNEL_DS); | |
261 | ret = sys_setrlimit(resource, (struct rlimit __user *) &r); | |
262 | set_fs(old_fs); | |
263 | return ret; | |
264 | } | |
265 | ||
266 | #ifdef COMPAT_RLIM_OLD_INFINITY | |
267 | ||
268 | asmlinkage long compat_sys_old_getrlimit(unsigned int resource, | |
269 | struct compat_rlimit __user *rlim) | |
270 | { | |
271 | struct rlimit r; | |
272 | int ret; | |
273 | mm_segment_t old_fs = get_fs(); | |
274 | ||
275 | set_fs(KERNEL_DS); | |
276 | ret = sys_old_getrlimit(resource, &r); | |
277 | set_fs(old_fs); | |
278 | ||
279 | if (!ret) { | |
280 | if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY) | |
281 | r.rlim_cur = COMPAT_RLIM_INFINITY; | |
282 | if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY) | |
283 | r.rlim_max = COMPAT_RLIM_INFINITY; | |
284 | ||
285 | if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) || | |
286 | __put_user(r.rlim_cur, &rlim->rlim_cur) || | |
287 | __put_user(r.rlim_max, &rlim->rlim_max)) | |
288 | return -EFAULT; | |
289 | } | |
290 | return ret; | |
291 | } | |
292 | ||
293 | #endif | |
294 | ||
295 | asmlinkage long compat_sys_getrlimit (unsigned int resource, | |
296 | struct compat_rlimit __user *rlim) | |
297 | { | |
298 | struct rlimit r; | |
299 | int ret; | |
300 | mm_segment_t old_fs = get_fs(); | |
301 | ||
302 | set_fs(KERNEL_DS); | |
303 | ret = sys_getrlimit(resource, (struct rlimit __user *) &r); | |
304 | set_fs(old_fs); | |
305 | if (!ret) { | |
306 | if (r.rlim_cur > COMPAT_RLIM_INFINITY) | |
307 | r.rlim_cur = COMPAT_RLIM_INFINITY; | |
308 | if (r.rlim_max > COMPAT_RLIM_INFINITY) | |
309 | r.rlim_max = COMPAT_RLIM_INFINITY; | |
310 | ||
311 | if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) || | |
312 | __put_user(r.rlim_cur, &rlim->rlim_cur) || | |
313 | __put_user(r.rlim_max, &rlim->rlim_max)) | |
314 | return -EFAULT; | |
315 | } | |
316 | return ret; | |
317 | } | |
318 | ||
319 | int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru) | |
320 | { | |
321 | if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) || | |
322 | __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) || | |
323 | __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) || | |
324 | __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) || | |
325 | __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) || | |
326 | __put_user(r->ru_maxrss, &ru->ru_maxrss) || | |
327 | __put_user(r->ru_ixrss, &ru->ru_ixrss) || | |
328 | __put_user(r->ru_idrss, &ru->ru_idrss) || | |
329 | __put_user(r->ru_isrss, &ru->ru_isrss) || | |
330 | __put_user(r->ru_minflt, &ru->ru_minflt) || | |
331 | __put_user(r->ru_majflt, &ru->ru_majflt) || | |
332 | __put_user(r->ru_nswap, &ru->ru_nswap) || | |
333 | __put_user(r->ru_inblock, &ru->ru_inblock) || | |
334 | __put_user(r->ru_oublock, &ru->ru_oublock) || | |
335 | __put_user(r->ru_msgsnd, &ru->ru_msgsnd) || | |
336 | __put_user(r->ru_msgrcv, &ru->ru_msgrcv) || | |
337 | __put_user(r->ru_nsignals, &ru->ru_nsignals) || | |
338 | __put_user(r->ru_nvcsw, &ru->ru_nvcsw) || | |
339 | __put_user(r->ru_nivcsw, &ru->ru_nivcsw)) | |
340 | return -EFAULT; | |
341 | return 0; | |
342 | } | |
343 | ||
344 | asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru) | |
345 | { | |
346 | struct rusage r; | |
347 | int ret; | |
348 | mm_segment_t old_fs = get_fs(); | |
349 | ||
350 | set_fs(KERNEL_DS); | |
351 | ret = sys_getrusage(who, (struct rusage __user *) &r); | |
352 | set_fs(old_fs); | |
353 | ||
354 | if (ret) | |
355 | return ret; | |
356 | ||
357 | if (put_compat_rusage(&r, ru)) | |
358 | return -EFAULT; | |
359 | ||
360 | return 0; | |
361 | } | |
362 | ||
363 | asmlinkage long | |
364 | compat_sys_wait4(compat_pid_t pid, compat_uint_t __user *stat_addr, int options, | |
365 | struct compat_rusage __user *ru) | |
366 | { | |
367 | if (!ru) { | |
368 | return sys_wait4(pid, stat_addr, options, NULL); | |
369 | } else { | |
370 | struct rusage r; | |
371 | int ret; | |
372 | unsigned int status; | |
373 | mm_segment_t old_fs = get_fs(); | |
374 | ||
375 | set_fs (KERNEL_DS); | |
376 | ret = sys_wait4(pid, | |
377 | (stat_addr ? | |
378 | (unsigned int __user *) &status : NULL), | |
379 | options, (struct rusage __user *) &r); | |
380 | set_fs (old_fs); | |
381 | ||
382 | if (ret > 0) { | |
383 | if (put_compat_rusage(&r, ru)) | |
384 | return -EFAULT; | |
385 | if (stat_addr && put_user(status, stat_addr)) | |
386 | return -EFAULT; | |
387 | } | |
388 | return ret; | |
389 | } | |
390 | } | |
391 | ||
392 | asmlinkage long compat_sys_waitid(int which, compat_pid_t pid, | |
393 | struct compat_siginfo __user *uinfo, int options, | |
394 | struct compat_rusage __user *uru) | |
395 | { | |
396 | siginfo_t info; | |
397 | struct rusage ru; | |
398 | long ret; | |
399 | mm_segment_t old_fs = get_fs(); | |
400 | ||
401 | memset(&info, 0, sizeof(info)); | |
402 | ||
403 | set_fs(KERNEL_DS); | |
404 | ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options, | |
405 | uru ? (struct rusage __user *)&ru : NULL); | |
406 | set_fs(old_fs); | |
407 | ||
408 | if ((ret < 0) || (info.si_signo == 0)) | |
409 | return ret; | |
410 | ||
411 | if (uru) { | |
412 | ret = put_compat_rusage(&ru, uru); | |
413 | if (ret) | |
414 | return ret; | |
415 | } | |
416 | ||
417 | BUG_ON(info.si_code & __SI_MASK); | |
418 | info.si_code |= __SI_CHLD; | |
419 | return copy_siginfo_to_user32(uinfo, &info); | |
420 | } | |
421 | ||
422 | static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr, | |
423 | unsigned len, cpumask_t *new_mask) | |
424 | { | |
425 | unsigned long *k; | |
426 | ||
427 | if (len < sizeof(cpumask_t)) | |
428 | memset(new_mask, 0, sizeof(cpumask_t)); | |
429 | else if (len > sizeof(cpumask_t)) | |
430 | len = sizeof(cpumask_t); | |
431 | ||
432 | k = cpus_addr(*new_mask); | |
433 | return compat_get_bitmap(k, user_mask_ptr, len * 8); | |
434 | } | |
435 | ||
436 | asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid, | |
437 | unsigned int len, | |
438 | compat_ulong_t __user *user_mask_ptr) | |
439 | { | |
440 | cpumask_t new_mask; | |
441 | int retval; | |
442 | ||
443 | retval = compat_get_user_cpu_mask(user_mask_ptr, len, &new_mask); | |
444 | if (retval) | |
445 | return retval; | |
446 | ||
447 | return sched_setaffinity(pid, new_mask); | |
448 | } | |
449 | ||
450 | asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len, | |
451 | compat_ulong_t __user *user_mask_ptr) | |
452 | { | |
453 | int ret; | |
454 | cpumask_t mask; | |
455 | unsigned long *k; | |
456 | unsigned int min_length = sizeof(cpumask_t); | |
457 | ||
458 | if (NR_CPUS <= BITS_PER_COMPAT_LONG) | |
459 | min_length = sizeof(compat_ulong_t); | |
460 | ||
461 | if (len < min_length) | |
462 | return -EINVAL; | |
463 | ||
464 | ret = sched_getaffinity(pid, &mask); | |
465 | if (ret < 0) | |
466 | return ret; | |
467 | ||
468 | k = cpus_addr(mask); | |
469 | ret = compat_put_bitmap(user_mask_ptr, k, min_length * 8); | |
470 | if (ret) | |
471 | return ret; | |
472 | ||
473 | return min_length; | |
474 | } | |
475 | ||
476 | static int get_compat_itimerspec(struct itimerspec *dst, | |
477 | struct compat_itimerspec __user *src) | |
478 | { | |
479 | if (get_compat_timespec(&dst->it_interval, &src->it_interval) || | |
480 | get_compat_timespec(&dst->it_value, &src->it_value)) | |
481 | return -EFAULT; | |
482 | return 0; | |
483 | } | |
484 | ||
485 | static int put_compat_itimerspec(struct compat_itimerspec __user *dst, | |
486 | struct itimerspec *src) | |
487 | { | |
488 | if (put_compat_timespec(&src->it_interval, &dst->it_interval) || | |
489 | put_compat_timespec(&src->it_value, &dst->it_value)) | |
490 | return -EFAULT; | |
491 | return 0; | |
492 | } | |
493 | ||
3a0f69d5 CH |
494 | long compat_sys_timer_create(clockid_t which_clock, |
495 | struct compat_sigevent __user *timer_event_spec, | |
496 | timer_t __user *created_timer_id) | |
497 | { | |
498 | struct sigevent __user *event = NULL; | |
499 | ||
500 | if (timer_event_spec) { | |
501 | struct sigevent kevent; | |
502 | ||
503 | event = compat_alloc_user_space(sizeof(*event)); | |
504 | if (get_compat_sigevent(&kevent, timer_event_spec) || | |
505 | copy_to_user(event, &kevent, sizeof(*event))) | |
506 | return -EFAULT; | |
507 | } | |
508 | ||
509 | return sys_timer_create(which_clock, event, created_timer_id); | |
510 | } | |
511 | ||
1da177e4 LT |
512 | long compat_sys_timer_settime(timer_t timer_id, int flags, |
513 | struct compat_itimerspec __user *new, | |
514 | struct compat_itimerspec __user *old) | |
515 | { | |
516 | long err; | |
517 | mm_segment_t oldfs; | |
518 | struct itimerspec newts, oldts; | |
519 | ||
520 | if (!new) | |
521 | return -EINVAL; | |
522 | if (get_compat_itimerspec(&newts, new)) | |
523 | return -EFAULT; | |
524 | oldfs = get_fs(); | |
525 | set_fs(KERNEL_DS); | |
526 | err = sys_timer_settime(timer_id, flags, | |
527 | (struct itimerspec __user *) &newts, | |
528 | (struct itimerspec __user *) &oldts); | |
529 | set_fs(oldfs); | |
530 | if (!err && old && put_compat_itimerspec(old, &oldts)) | |
531 | return -EFAULT; | |
532 | return err; | |
533 | } | |
534 | ||
535 | long compat_sys_timer_gettime(timer_t timer_id, | |
536 | struct compat_itimerspec __user *setting) | |
537 | { | |
538 | long err; | |
539 | mm_segment_t oldfs; | |
540 | struct itimerspec ts; | |
541 | ||
542 | oldfs = get_fs(); | |
543 | set_fs(KERNEL_DS); | |
544 | err = sys_timer_gettime(timer_id, | |
545 | (struct itimerspec __user *) &ts); | |
546 | set_fs(oldfs); | |
547 | if (!err && put_compat_itimerspec(setting, &ts)) | |
548 | return -EFAULT; | |
549 | return err; | |
550 | } | |
551 | ||
552 | long compat_sys_clock_settime(clockid_t which_clock, | |
553 | struct compat_timespec __user *tp) | |
554 | { | |
555 | long err; | |
556 | mm_segment_t oldfs; | |
557 | struct timespec ts; | |
558 | ||
559 | if (get_compat_timespec(&ts, tp)) | |
560 | return -EFAULT; | |
561 | oldfs = get_fs(); | |
562 | set_fs(KERNEL_DS); | |
563 | err = sys_clock_settime(which_clock, | |
564 | (struct timespec __user *) &ts); | |
565 | set_fs(oldfs); | |
566 | return err; | |
567 | } | |
568 | ||
569 | long compat_sys_clock_gettime(clockid_t which_clock, | |
570 | struct compat_timespec __user *tp) | |
571 | { | |
572 | long err; | |
573 | mm_segment_t oldfs; | |
574 | struct timespec ts; | |
575 | ||
576 | oldfs = get_fs(); | |
577 | set_fs(KERNEL_DS); | |
578 | err = sys_clock_gettime(which_clock, | |
579 | (struct timespec __user *) &ts); | |
580 | set_fs(oldfs); | |
581 | if (!err && put_compat_timespec(&ts, tp)) | |
582 | return -EFAULT; | |
583 | return err; | |
584 | } | |
585 | ||
586 | long compat_sys_clock_getres(clockid_t which_clock, | |
587 | struct compat_timespec __user *tp) | |
588 | { | |
589 | long err; | |
590 | mm_segment_t oldfs; | |
591 | struct timespec ts; | |
592 | ||
593 | oldfs = get_fs(); | |
594 | set_fs(KERNEL_DS); | |
595 | err = sys_clock_getres(which_clock, | |
596 | (struct timespec __user *) &ts); | |
597 | set_fs(oldfs); | |
598 | if (!err && tp && put_compat_timespec(&ts, tp)) | |
599 | return -EFAULT; | |
600 | return err; | |
601 | } | |
602 | ||
603 | long compat_sys_clock_nanosleep(clockid_t which_clock, int flags, | |
604 | struct compat_timespec __user *rqtp, | |
605 | struct compat_timespec __user *rmtp) | |
606 | { | |
607 | long err; | |
608 | mm_segment_t oldfs; | |
609 | struct timespec in, out; | |
610 | ||
611 | if (get_compat_timespec(&in, rqtp)) | |
612 | return -EFAULT; | |
613 | ||
614 | oldfs = get_fs(); | |
615 | set_fs(KERNEL_DS); | |
616 | err = sys_clock_nanosleep(which_clock, flags, | |
617 | (struct timespec __user *) &in, | |
618 | (struct timespec __user *) &out); | |
619 | set_fs(oldfs); | |
620 | if ((err == -ERESTART_RESTARTBLOCK) && rmtp && | |
621 | put_compat_timespec(&out, rmtp)) | |
622 | return -EFAULT; | |
623 | return err; | |
624 | } | |
625 | ||
626 | /* | |
627 | * We currently only need the following fields from the sigevent | |
628 | * structure: sigev_value, sigev_signo, sig_notify and (sometimes | |
629 | * sigev_notify_thread_id). The others are handled in user mode. | |
630 | * We also assume that copying sigev_value.sival_int is sufficient | |
631 | * to keep all the bits of sigev_value.sival_ptr intact. | |
632 | */ | |
633 | int get_compat_sigevent(struct sigevent *event, | |
634 | const struct compat_sigevent __user *u_event) | |
635 | { | |
51410d3c | 636 | memset(event, 0, sizeof(*event)); |
1da177e4 LT |
637 | return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) || |
638 | __get_user(event->sigev_value.sival_int, | |
639 | &u_event->sigev_value.sival_int) || | |
640 | __get_user(event->sigev_signo, &u_event->sigev_signo) || | |
641 | __get_user(event->sigev_notify, &u_event->sigev_notify) || | |
642 | __get_user(event->sigev_notify_thread_id, | |
643 | &u_event->sigev_notify_thread_id)) | |
644 | ? -EFAULT : 0; | |
645 | } | |
646 | ||
1da177e4 LT |
647 | long compat_get_bitmap(unsigned long *mask, compat_ulong_t __user *umask, |
648 | unsigned long bitmap_size) | |
649 | { | |
650 | int i, j; | |
651 | unsigned long m; | |
652 | compat_ulong_t um; | |
653 | unsigned long nr_compat_longs; | |
654 | ||
655 | /* align bitmap up to nearest compat_long_t boundary */ | |
656 | bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); | |
657 | ||
658 | if (!access_ok(VERIFY_READ, umask, bitmap_size / 8)) | |
659 | return -EFAULT; | |
660 | ||
661 | nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); | |
662 | ||
663 | for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) { | |
664 | m = 0; | |
665 | ||
666 | for (j = 0; j < sizeof(m)/sizeof(um); j++) { | |
667 | /* | |
668 | * We dont want to read past the end of the userspace | |
669 | * bitmap. We must however ensure the end of the | |
670 | * kernel bitmap is zeroed. | |
671 | */ | |
672 | if (nr_compat_longs-- > 0) { | |
673 | if (__get_user(um, umask)) | |
674 | return -EFAULT; | |
675 | } else { | |
676 | um = 0; | |
677 | } | |
678 | ||
679 | umask++; | |
680 | m |= (long)um << (j * BITS_PER_COMPAT_LONG); | |
681 | } | |
682 | *mask++ = m; | |
683 | } | |
684 | ||
685 | return 0; | |
686 | } | |
687 | ||
688 | long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask, | |
689 | unsigned long bitmap_size) | |
690 | { | |
691 | int i, j; | |
692 | unsigned long m; | |
693 | compat_ulong_t um; | |
694 | unsigned long nr_compat_longs; | |
695 | ||
696 | /* align bitmap up to nearest compat_long_t boundary */ | |
697 | bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); | |
698 | ||
699 | if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8)) | |
700 | return -EFAULT; | |
701 | ||
702 | nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); | |
703 | ||
704 | for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) { | |
705 | m = *mask++; | |
706 | ||
707 | for (j = 0; j < sizeof(m)/sizeof(um); j++) { | |
708 | um = m; | |
709 | ||
710 | /* | |
711 | * We dont want to write past the end of the userspace | |
712 | * bitmap. | |
713 | */ | |
714 | if (nr_compat_longs-- > 0) { | |
715 | if (__put_user(um, umask)) | |
716 | return -EFAULT; | |
717 | } | |
718 | ||
719 | umask++; | |
720 | m >>= 4*sizeof(um); | |
721 | m >>= 4*sizeof(um); | |
722 | } | |
723 | } | |
724 | ||
725 | return 0; | |
726 | } | |
727 | ||
728 | void | |
729 | sigset_from_compat (sigset_t *set, compat_sigset_t *compat) | |
730 | { | |
731 | switch (_NSIG_WORDS) { | |
732 | #if defined (__COMPAT_ENDIAN_SWAP__) | |
733 | case 4: set->sig[3] = compat->sig[7] | (((long)compat->sig[6]) << 32 ); | |
734 | case 3: set->sig[2] = compat->sig[5] | (((long)compat->sig[4]) << 32 ); | |
735 | case 2: set->sig[1] = compat->sig[3] | (((long)compat->sig[2]) << 32 ); | |
736 | case 1: set->sig[0] = compat->sig[1] | (((long)compat->sig[0]) << 32 ); | |
737 | #else | |
738 | case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 ); | |
739 | case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 ); | |
740 | case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 ); | |
741 | case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 ); | |
742 | #endif | |
743 | } | |
744 | } | |
745 | ||
746 | asmlinkage long | |
747 | compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese, | |
748 | struct compat_siginfo __user *uinfo, | |
749 | struct compat_timespec __user *uts, compat_size_t sigsetsize) | |
750 | { | |
751 | compat_sigset_t s32; | |
752 | sigset_t s; | |
753 | int sig; | |
754 | struct timespec t; | |
755 | siginfo_t info; | |
756 | long ret, timeout = 0; | |
757 | ||
758 | if (sigsetsize != sizeof(sigset_t)) | |
759 | return -EINVAL; | |
760 | ||
761 | if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t))) | |
762 | return -EFAULT; | |
763 | sigset_from_compat(&s, &s32); | |
764 | sigdelsetmask(&s,sigmask(SIGKILL)|sigmask(SIGSTOP)); | |
765 | signotset(&s); | |
766 | ||
767 | if (uts) { | |
768 | if (get_compat_timespec (&t, uts)) | |
769 | return -EFAULT; | |
770 | if (t.tv_nsec >= 1000000000L || t.tv_nsec < 0 | |
771 | || t.tv_sec < 0) | |
772 | return -EINVAL; | |
773 | } | |
774 | ||
775 | spin_lock_irq(¤t->sighand->siglock); | |
776 | sig = dequeue_signal(current, &s, &info); | |
777 | if (!sig) { | |
778 | timeout = MAX_SCHEDULE_TIMEOUT; | |
779 | if (uts) | |
780 | timeout = timespec_to_jiffies(&t) | |
781 | +(t.tv_sec || t.tv_nsec); | |
782 | if (timeout) { | |
783 | current->real_blocked = current->blocked; | |
784 | sigandsets(¤t->blocked, ¤t->blocked, &s); | |
785 | ||
786 | recalc_sigpending(); | |
787 | spin_unlock_irq(¤t->sighand->siglock); | |
788 | ||
75bcc8c5 | 789 | timeout = schedule_timeout_interruptible(timeout); |
1da177e4 LT |
790 | |
791 | spin_lock_irq(¤t->sighand->siglock); | |
792 | sig = dequeue_signal(current, &s, &info); | |
793 | current->blocked = current->real_blocked; | |
794 | siginitset(¤t->real_blocked, 0); | |
795 | recalc_sigpending(); | |
796 | } | |
797 | } | |
798 | spin_unlock_irq(¤t->sighand->siglock); | |
799 | ||
800 | if (sig) { | |
801 | ret = sig; | |
802 | if (uinfo) { | |
803 | if (copy_siginfo_to_user32(uinfo, &info)) | |
804 | ret = -EFAULT; | |
805 | } | |
806 | }else { | |
807 | ret = timeout?-EINTR:-EAGAIN; | |
808 | } | |
809 | return ret; | |
810 | ||
811 | } | |
812 | ||
813 | #ifdef __ARCH_WANT_COMPAT_SYS_TIME | |
814 | ||
815 | /* compat_time_t is a 32 bit "long" and needs to get converted. */ | |
816 | ||
817 | asmlinkage long compat_sys_time(compat_time_t __user * tloc) | |
818 | { | |
819 | compat_time_t i; | |
820 | struct timeval tv; | |
821 | ||
822 | do_gettimeofday(&tv); | |
823 | i = tv.tv_sec; | |
824 | ||
825 | if (tloc) { | |
826 | if (put_user(i,tloc)) | |
827 | i = -EFAULT; | |
828 | } | |
829 | return i; | |
830 | } | |
831 | ||
832 | asmlinkage long compat_sys_stime(compat_time_t __user *tptr) | |
833 | { | |
834 | struct timespec tv; | |
835 | int err; | |
836 | ||
837 | if (get_user(tv.tv_sec, tptr)) | |
838 | return -EFAULT; | |
839 | ||
840 | tv.tv_nsec = 0; | |
841 | ||
842 | err = security_settime(&tv, NULL); | |
843 | if (err) | |
844 | return err; | |
845 | ||
846 | do_settimeofday(&tv); | |
847 | return 0; | |
848 | } | |
849 | ||
850 | #endif /* __ARCH_WANT_COMPAT_SYS_TIME */ | |
150256d8 DW |
851 | |
852 | #ifdef __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND | |
853 | asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset, compat_size_t sigsetsize) | |
854 | { | |
855 | sigset_t newset; | |
856 | compat_sigset_t newset32; | |
857 | ||
858 | /* XXX: Don't preclude handling different sized sigset_t's. */ | |
859 | if (sigsetsize != sizeof(sigset_t)) | |
860 | return -EINVAL; | |
861 | ||
862 | if (copy_from_user(&newset32, unewset, sizeof(compat_sigset_t))) | |
863 | return -EFAULT; | |
864 | sigset_from_compat(&newset, &newset32); | |
865 | sigdelsetmask(&newset, sigmask(SIGKILL)|sigmask(SIGSTOP)); | |
866 | ||
867 | spin_lock_irq(¤t->sighand->siglock); | |
868 | current->saved_sigmask = current->blocked; | |
869 | current->blocked = newset; | |
870 | recalc_sigpending(); | |
871 | spin_unlock_irq(¤t->sighand->siglock); | |
872 | ||
873 | current->state = TASK_INTERRUPTIBLE; | |
874 | schedule(); | |
875 | set_thread_flag(TIF_RESTORE_SIGMASK); | |
876 | return -ERESTARTNOHAND; | |
877 | } | |
878 | #endif /* __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND */ | |
3158e941 SR |
879 | |
880 | asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp) | |
881 | { | |
882 | struct timex txc; | |
883 | int ret; | |
884 | ||
885 | memset(&txc, 0, sizeof(struct timex)); | |
886 | ||
887 | if (!access_ok(VERIFY_READ, utp, sizeof(struct compat_timex)) || | |
888 | __get_user(txc.modes, &utp->modes) || | |
889 | __get_user(txc.offset, &utp->offset) || | |
890 | __get_user(txc.freq, &utp->freq) || | |
891 | __get_user(txc.maxerror, &utp->maxerror) || | |
892 | __get_user(txc.esterror, &utp->esterror) || | |
893 | __get_user(txc.status, &utp->status) || | |
894 | __get_user(txc.constant, &utp->constant) || | |
895 | __get_user(txc.precision, &utp->precision) || | |
896 | __get_user(txc.tolerance, &utp->tolerance) || | |
897 | __get_user(txc.time.tv_sec, &utp->time.tv_sec) || | |
898 | __get_user(txc.time.tv_usec, &utp->time.tv_usec) || | |
899 | __get_user(txc.tick, &utp->tick) || | |
900 | __get_user(txc.ppsfreq, &utp->ppsfreq) || | |
901 | __get_user(txc.jitter, &utp->jitter) || | |
902 | __get_user(txc.shift, &utp->shift) || | |
903 | __get_user(txc.stabil, &utp->stabil) || | |
904 | __get_user(txc.jitcnt, &utp->jitcnt) || | |
905 | __get_user(txc.calcnt, &utp->calcnt) || | |
906 | __get_user(txc.errcnt, &utp->errcnt) || | |
907 | __get_user(txc.stbcnt, &utp->stbcnt)) | |
908 | return -EFAULT; | |
909 | ||
910 | ret = do_adjtimex(&txc); | |
911 | ||
912 | if (!access_ok(VERIFY_WRITE, utp, sizeof(struct compat_timex)) || | |
913 | __put_user(txc.modes, &utp->modes) || | |
914 | __put_user(txc.offset, &utp->offset) || | |
915 | __put_user(txc.freq, &utp->freq) || | |
916 | __put_user(txc.maxerror, &utp->maxerror) || | |
917 | __put_user(txc.esterror, &utp->esterror) || | |
918 | __put_user(txc.status, &utp->status) || | |
919 | __put_user(txc.constant, &utp->constant) || | |
920 | __put_user(txc.precision, &utp->precision) || | |
921 | __put_user(txc.tolerance, &utp->tolerance) || | |
922 | __put_user(txc.time.tv_sec, &utp->time.tv_sec) || | |
923 | __put_user(txc.time.tv_usec, &utp->time.tv_usec) || | |
924 | __put_user(txc.tick, &utp->tick) || | |
925 | __put_user(txc.ppsfreq, &utp->ppsfreq) || | |
926 | __put_user(txc.jitter, &utp->jitter) || | |
927 | __put_user(txc.shift, &utp->shift) || | |
928 | __put_user(txc.stabil, &utp->stabil) || | |
929 | __put_user(txc.jitcnt, &utp->jitcnt) || | |
930 | __put_user(txc.calcnt, &utp->calcnt) || | |
931 | __put_user(txc.errcnt, &utp->errcnt) || | |
932 | __put_user(txc.stbcnt, &utp->stbcnt)) | |
933 | ret = -EFAULT; | |
934 | ||
935 | return ret; | |
936 | } |