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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 */ | |
20 | #include <linux/futex.h> /* for FUTEX_WAIT */ | |
21 | #include <linux/syscalls.h> | |
22 | #include <linux/unistd.h> | |
23 | #include <linux/security.h> | |
24 | ||
25 | #include <asm/uaccess.h> | |
26 | #include <asm/bug.h> | |
27 | ||
28 | int get_compat_timespec(struct timespec *ts, const struct compat_timespec __user *cts) | |
29 | { | |
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; | |
33 | } | |
34 | ||
35 | int put_compat_timespec(const struct timespec *ts, struct compat_timespec __user *cts) | |
36 | { | |
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; | |
40 | } | |
41 | ||
42 | static long compat_nanosleep_restart(struct restart_block *restart) | |
43 | { | |
44 | unsigned long expire = restart->arg0, now = jiffies; | |
45 | struct compat_timespec __user *rmtp; | |
46 | ||
47 | /* Did it expire while we handled signals? */ | |
48 | if (!time_after(expire, now)) | |
49 | return 0; | |
50 | ||
51 | current->state = TASK_INTERRUPTIBLE; | |
52 | expire = schedule_timeout(expire - now); | |
53 | if (expire == 0) | |
54 | return 0; | |
55 | ||
56 | rmtp = (struct compat_timespec __user *)restart->arg1; | |
57 | if (rmtp) { | |
58 | struct compat_timespec ct; | |
59 | struct timespec t; | |
60 | ||
61 | jiffies_to_timespec(expire, &t); | |
62 | ct.tv_sec = t.tv_sec; | |
63 | ct.tv_nsec = t.tv_nsec; | |
64 | if (copy_to_user(rmtp, &ct, sizeof(ct))) | |
65 | return -EFAULT; | |
66 | } | |
67 | /* The 'restart' block is already filled in */ | |
68 | return -ERESTART_RESTARTBLOCK; | |
69 | } | |
70 | ||
71 | asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp, | |
72 | struct compat_timespec __user *rmtp) | |
73 | { | |
74 | struct timespec t; | |
75 | struct restart_block *restart; | |
76 | unsigned long expire; | |
77 | ||
78 | if (get_compat_timespec(&t, rqtp)) | |
79 | return -EFAULT; | |
80 | ||
81 | if ((t.tv_nsec >= 1000000000L) || (t.tv_nsec < 0) || (t.tv_sec < 0)) | |
82 | return -EINVAL; | |
83 | ||
84 | expire = timespec_to_jiffies(&t) + (t.tv_sec || t.tv_nsec); | |
85 | current->state = TASK_INTERRUPTIBLE; | |
86 | expire = schedule_timeout(expire); | |
87 | if (expire == 0) | |
88 | return 0; | |
89 | ||
90 | if (rmtp) { | |
91 | jiffies_to_timespec(expire, &t); | |
92 | if (put_compat_timespec(&t, rmtp)) | |
93 | return -EFAULT; | |
94 | } | |
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; | |
100 | } | |
101 | ||
102 | static inline long get_compat_itimerval(struct itimerval *o, | |
103 | struct compat_itimerval __user *i) | |
104 | { | |
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))); | |
110 | } | |
111 | ||
112 | static inline long put_compat_itimerval(struct compat_itimerval __user *o, | |
113 | struct itimerval *i) | |
114 | { | |
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))); | |
120 | } | |
121 | ||
122 | asmlinkage long compat_sys_getitimer(int which, | |
123 | struct compat_itimerval __user *it) | |
124 | { | |
125 | struct itimerval kit; | |
126 | int error; | |
127 | ||
128 | error = do_getitimer(which, &kit); | |
129 | if (!error && put_compat_itimerval(it, &kit)) | |
130 | error = -EFAULT; | |
131 | return error; | |
132 | } | |
133 | ||
134 | asmlinkage long compat_sys_setitimer(int which, | |
135 | struct compat_itimerval __user *in, | |
136 | struct compat_itimerval __user *out) | |
137 | { | |
138 | struct itimerval kin, kout; | |
139 | int error; | |
140 | ||
141 | if (in) { | |
142 | if (get_compat_itimerval(&kin, in)) | |
143 | return -EFAULT; | |
144 | } else | |
145 | memset(&kin, 0, sizeof(kin)); | |
146 | ||
147 | error = do_setitimer(which, &kin, out ? &kout : NULL); | |
148 | if (error || !out) | |
149 | return error; | |
150 | if (put_compat_itimerval(out, &kout)) | |
151 | return -EFAULT; | |
152 | return 0; | |
153 | } | |
154 | ||
155 | asmlinkage long compat_sys_times(struct compat_tms __user *tbuf) | |
156 | { | |
157 | /* | |
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. | |
162 | */ | |
163 | if (tbuf) { | |
164 | struct compat_tms tmp; | |
165 | struct task_struct *tsk = current; | |
166 | struct task_struct *t; | |
167 | cputime_t utime, stime, cutime, cstime; | |
168 | ||
169 | read_lock(&tasklist_lock); | |
170 | utime = tsk->signal->utime; | |
171 | stime = tsk->signal->stime; | |
172 | t = tsk; | |
173 | do { | |
174 | utime = cputime_add(utime, t->utime); | |
175 | stime = cputime_add(stime, t->stime); | |
176 | t = next_thread(t); | |
177 | } while (t != tsk); | |
178 | ||
179 | /* | |
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. | |
187 | */ | |
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); | |
193 | ||
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))) | |
199 | return -EFAULT; | |
200 | } | |
201 | return compat_jiffies_to_clock_t(jiffies); | |
202 | } | |
203 | ||
204 | /* | |
205 | * Assumption: old_sigset_t and compat_old_sigset_t are both | |
206 | * types that can be passed to put_user()/get_user(). | |
207 | */ | |
208 | ||
209 | asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set) | |
210 | { | |
211 | old_sigset_t s; | |
212 | long ret; | |
213 | mm_segment_t old_fs = get_fs(); | |
214 | ||
215 | set_fs(KERNEL_DS); | |
216 | ret = sys_sigpending((old_sigset_t __user *) &s); | |
217 | set_fs(old_fs); | |
218 | if (ret == 0) | |
219 | ret = put_user(s, set); | |
220 | return ret; | |
221 | } | |
222 | ||
223 | asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *set, | |
224 | compat_old_sigset_t __user *oset) | |
225 | { | |
226 | old_sigset_t s; | |
227 | long ret; | |
228 | mm_segment_t old_fs; | |
229 | ||
230 | if (set && get_user(s, set)) | |
231 | return -EFAULT; | |
232 | old_fs = get_fs(); | |
233 | set_fs(KERNEL_DS); | |
234 | ret = sys_sigprocmask(how, | |
235 | set ? (old_sigset_t __user *) &s : NULL, | |
236 | oset ? (old_sigset_t __user *) &s : NULL); | |
237 | set_fs(old_fs); | |
238 | if (ret == 0) | |
239 | if (oset) | |
240 | ret = put_user(s, oset); | |
241 | return ret; | |
242 | } | |
243 | ||
244 | #ifdef CONFIG_FUTEX | |
245 | asmlinkage long compat_sys_futex(u32 __user *uaddr, int op, int val, | |
246 | struct compat_timespec __user *utime, u32 __user *uaddr2, | |
247 | int val3) | |
248 | { | |
249 | struct timespec t; | |
250 | unsigned long timeout = MAX_SCHEDULE_TIMEOUT; | |
251 | int val2 = 0; | |
252 | ||
253 | if ((op == FUTEX_WAIT) && utime) { | |
254 | if (get_compat_timespec(&t, utime)) | |
255 | return -EFAULT; | |
256 | timeout = timespec_to_jiffies(&t) + 1; | |
257 | } | |
258 | if (op >= FUTEX_REQUEUE) | |
259 | val2 = (int) (unsigned long) utime; | |
260 | ||
261 | return do_futex((unsigned long)uaddr, op, val, timeout, | |
262 | (unsigned long)uaddr2, val2, val3); | |
263 | } | |
264 | #endif | |
265 | ||
266 | asmlinkage long compat_sys_setrlimit(unsigned int resource, | |
267 | struct compat_rlimit __user *rlim) | |
268 | { | |
269 | struct rlimit r; | |
270 | int ret; | |
271 | mm_segment_t old_fs = get_fs (); | |
272 | ||
273 | if (resource >= RLIM_NLIMITS) | |
274 | return -EINVAL; | |
275 | ||
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)) | |
279 | return -EFAULT; | |
280 | ||
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; | |
285 | set_fs(KERNEL_DS); | |
286 | ret = sys_setrlimit(resource, (struct rlimit __user *) &r); | |
287 | set_fs(old_fs); | |
288 | return ret; | |
289 | } | |
290 | ||
291 | #ifdef COMPAT_RLIM_OLD_INFINITY | |
292 | ||
293 | asmlinkage long compat_sys_old_getrlimit(unsigned int resource, | |
294 | struct compat_rlimit __user *rlim) | |
295 | { | |
296 | struct rlimit r; | |
297 | int ret; | |
298 | mm_segment_t old_fs = get_fs(); | |
299 | ||
300 | set_fs(KERNEL_DS); | |
301 | ret = sys_old_getrlimit(resource, &r); | |
302 | set_fs(old_fs); | |
303 | ||
304 | if (!ret) { | |
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; | |
309 | ||
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)) | |
313 | return -EFAULT; | |
314 | } | |
315 | return ret; | |
316 | } | |
317 | ||
318 | #endif | |
319 | ||
320 | asmlinkage long compat_sys_getrlimit (unsigned int resource, | |
321 | struct compat_rlimit __user *rlim) | |
322 | { | |
323 | struct rlimit r; | |
324 | int ret; | |
325 | mm_segment_t old_fs = get_fs(); | |
326 | ||
327 | set_fs(KERNEL_DS); | |
328 | ret = sys_getrlimit(resource, (struct rlimit __user *) &r); | |
329 | set_fs(old_fs); | |
330 | if (!ret) { | |
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; | |
335 | ||
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)) | |
339 | return -EFAULT; | |
340 | } | |
341 | return ret; | |
342 | } | |
343 | ||
344 | int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru) | |
345 | { | |
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)) | |
365 | return -EFAULT; | |
366 | return 0; | |
367 | } | |
368 | ||
369 | asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru) | |
370 | { | |
371 | struct rusage r; | |
372 | int ret; | |
373 | mm_segment_t old_fs = get_fs(); | |
374 | ||
375 | set_fs(KERNEL_DS); | |
376 | ret = sys_getrusage(who, (struct rusage __user *) &r); | |
377 | set_fs(old_fs); | |
378 | ||
379 | if (ret) | |
380 | return ret; | |
381 | ||
382 | if (put_compat_rusage(&r, ru)) | |
383 | return -EFAULT; | |
384 | ||
385 | return 0; | |
386 | } | |
387 | ||
388 | asmlinkage long | |
389 | compat_sys_wait4(compat_pid_t pid, compat_uint_t __user *stat_addr, int options, | |
390 | struct compat_rusage __user *ru) | |
391 | { | |
392 | if (!ru) { | |
393 | return sys_wait4(pid, stat_addr, options, NULL); | |
394 | } else { | |
395 | struct rusage r; | |
396 | int ret; | |
397 | unsigned int status; | |
398 | mm_segment_t old_fs = get_fs(); | |
399 | ||
400 | set_fs (KERNEL_DS); | |
401 | ret = sys_wait4(pid, | |
402 | (stat_addr ? | |
403 | (unsigned int __user *) &status : NULL), | |
404 | options, (struct rusage __user *) &r); | |
405 | set_fs (old_fs); | |
406 | ||
407 | if (ret > 0) { | |
408 | if (put_compat_rusage(&r, ru)) | |
409 | return -EFAULT; | |
410 | if (stat_addr && put_user(status, stat_addr)) | |
411 | return -EFAULT; | |
412 | } | |
413 | return ret; | |
414 | } | |
415 | } | |
416 | ||
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) | |
420 | { | |
421 | siginfo_t info; | |
422 | struct rusage ru; | |
423 | long ret; | |
424 | mm_segment_t old_fs = get_fs(); | |
425 | ||
426 | memset(&info, 0, sizeof(info)); | |
427 | ||
428 | set_fs(KERNEL_DS); | |
429 | ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options, | |
430 | uru ? (struct rusage __user *)&ru : NULL); | |
431 | set_fs(old_fs); | |
432 | ||
433 | if ((ret < 0) || (info.si_signo == 0)) | |
434 | return ret; | |
435 | ||
436 | if (uru) { | |
437 | ret = put_compat_rusage(&ru, uru); | |
438 | if (ret) | |
439 | return ret; | |
440 | } | |
441 | ||
442 | BUG_ON(info.si_code & __SI_MASK); | |
443 | info.si_code |= __SI_CHLD; | |
444 | return copy_siginfo_to_user32(uinfo, &info); | |
445 | } | |
446 | ||
447 | static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr, | |
448 | unsigned len, cpumask_t *new_mask) | |
449 | { | |
450 | unsigned long *k; | |
451 | ||
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); | |
456 | ||
457 | k = cpus_addr(*new_mask); | |
458 | return compat_get_bitmap(k, user_mask_ptr, len * 8); | |
459 | } | |
460 | ||
461 | asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid, | |
462 | unsigned int len, | |
463 | compat_ulong_t __user *user_mask_ptr) | |
464 | { | |
465 | cpumask_t new_mask; | |
466 | int retval; | |
467 | ||
468 | retval = compat_get_user_cpu_mask(user_mask_ptr, len, &new_mask); | |
469 | if (retval) | |
470 | return retval; | |
471 | ||
472 | return sched_setaffinity(pid, new_mask); | |
473 | } | |
474 | ||
475 | asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len, | |
476 | compat_ulong_t __user *user_mask_ptr) | |
477 | { | |
478 | int ret; | |
479 | cpumask_t mask; | |
480 | unsigned long *k; | |
481 | unsigned int min_length = sizeof(cpumask_t); | |
482 | ||
483 | if (NR_CPUS <= BITS_PER_COMPAT_LONG) | |
484 | min_length = sizeof(compat_ulong_t); | |
485 | ||
486 | if (len < min_length) | |
487 | return -EINVAL; | |
488 | ||
489 | ret = sched_getaffinity(pid, &mask); | |
490 | if (ret < 0) | |
491 | return ret; | |
492 | ||
493 | k = cpus_addr(mask); | |
494 | ret = compat_put_bitmap(user_mask_ptr, k, min_length * 8); | |
495 | if (ret) | |
496 | return ret; | |
497 | ||
498 | return min_length; | |
499 | } | |
500 | ||
501 | static int get_compat_itimerspec(struct itimerspec *dst, | |
502 | struct compat_itimerspec __user *src) | |
503 | { | |
504 | if (get_compat_timespec(&dst->it_interval, &src->it_interval) || | |
505 | get_compat_timespec(&dst->it_value, &src->it_value)) | |
506 | return -EFAULT; | |
507 | return 0; | |
508 | } | |
509 | ||
510 | static int put_compat_itimerspec(struct compat_itimerspec __user *dst, | |
511 | struct itimerspec *src) | |
512 | { | |
513 | if (put_compat_timespec(&src->it_interval, &dst->it_interval) || | |
514 | put_compat_timespec(&src->it_value, &dst->it_value)) | |
515 | return -EFAULT; | |
516 | return 0; | |
517 | } | |
518 | ||
519 | long compat_sys_timer_settime(timer_t timer_id, int flags, | |
520 | struct compat_itimerspec __user *new, | |
521 | struct compat_itimerspec __user *old) | |
522 | { | |
523 | long err; | |
524 | mm_segment_t oldfs; | |
525 | struct itimerspec newts, oldts; | |
526 | ||
527 | if (!new) | |
528 | return -EINVAL; | |
529 | if (get_compat_itimerspec(&newts, new)) | |
530 | return -EFAULT; | |
531 | oldfs = get_fs(); | |
532 | set_fs(KERNEL_DS); | |
533 | err = sys_timer_settime(timer_id, flags, | |
534 | (struct itimerspec __user *) &newts, | |
535 | (struct itimerspec __user *) &oldts); | |
536 | set_fs(oldfs); | |
537 | if (!err && old && put_compat_itimerspec(old, &oldts)) | |
538 | return -EFAULT; | |
539 | return err; | |
540 | } | |
541 | ||
542 | long compat_sys_timer_gettime(timer_t timer_id, | |
543 | struct compat_itimerspec __user *setting) | |
544 | { | |
545 | long err; | |
546 | mm_segment_t oldfs; | |
547 | struct itimerspec ts; | |
548 | ||
549 | oldfs = get_fs(); | |
550 | set_fs(KERNEL_DS); | |
551 | err = sys_timer_gettime(timer_id, | |
552 | (struct itimerspec __user *) &ts); | |
553 | set_fs(oldfs); | |
554 | if (!err && put_compat_itimerspec(setting, &ts)) | |
555 | return -EFAULT; | |
556 | return err; | |
557 | } | |
558 | ||
559 | long compat_sys_clock_settime(clockid_t which_clock, | |
560 | struct compat_timespec __user *tp) | |
561 | { | |
562 | long err; | |
563 | mm_segment_t oldfs; | |
564 | struct timespec ts; | |
565 | ||
566 | if (get_compat_timespec(&ts, tp)) | |
567 | return -EFAULT; | |
568 | oldfs = get_fs(); | |
569 | set_fs(KERNEL_DS); | |
570 | err = sys_clock_settime(which_clock, | |
571 | (struct timespec __user *) &ts); | |
572 | set_fs(oldfs); | |
573 | return err; | |
574 | } | |
575 | ||
576 | long compat_sys_clock_gettime(clockid_t which_clock, | |
577 | struct compat_timespec __user *tp) | |
578 | { | |
579 | long err; | |
580 | mm_segment_t oldfs; | |
581 | struct timespec ts; | |
582 | ||
583 | oldfs = get_fs(); | |
584 | set_fs(KERNEL_DS); | |
585 | err = sys_clock_gettime(which_clock, | |
586 | (struct timespec __user *) &ts); | |
587 | set_fs(oldfs); | |
588 | if (!err && put_compat_timespec(&ts, tp)) | |
589 | return -EFAULT; | |
590 | return err; | |
591 | } | |
592 | ||
593 | long compat_sys_clock_getres(clockid_t which_clock, | |
594 | struct compat_timespec __user *tp) | |
595 | { | |
596 | long err; | |
597 | mm_segment_t oldfs; | |
598 | struct timespec ts; | |
599 | ||
600 | oldfs = get_fs(); | |
601 | set_fs(KERNEL_DS); | |
602 | err = sys_clock_getres(which_clock, | |
603 | (struct timespec __user *) &ts); | |
604 | set_fs(oldfs); | |
605 | if (!err && tp && put_compat_timespec(&ts, tp)) | |
606 | return -EFAULT; | |
607 | return err; | |
608 | } | |
609 | ||
610 | long compat_sys_clock_nanosleep(clockid_t which_clock, int flags, | |
611 | struct compat_timespec __user *rqtp, | |
612 | struct compat_timespec __user *rmtp) | |
613 | { | |
614 | long err; | |
615 | mm_segment_t oldfs; | |
616 | struct timespec in, out; | |
617 | ||
618 | if (get_compat_timespec(&in, rqtp)) | |
619 | return -EFAULT; | |
620 | ||
621 | oldfs = get_fs(); | |
622 | set_fs(KERNEL_DS); | |
623 | err = sys_clock_nanosleep(which_clock, flags, | |
624 | (struct timespec __user *) &in, | |
625 | (struct timespec __user *) &out); | |
626 | set_fs(oldfs); | |
627 | if ((err == -ERESTART_RESTARTBLOCK) && rmtp && | |
628 | put_compat_timespec(&out, rmtp)) | |
629 | return -EFAULT; | |
630 | return err; | |
631 | } | |
632 | ||
633 | /* | |
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. | |
639 | */ | |
640 | int get_compat_sigevent(struct sigevent *event, | |
641 | const struct compat_sigevent __user *u_event) | |
642 | { | |
51410d3c | 643 | memset(event, 0, sizeof(*event)); |
1da177e4 LT |
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)) | |
651 | ? -EFAULT : 0; | |
652 | } | |
653 | ||
654 | /* timer_create is architecture specific because it needs sigevent conversion */ | |
655 | ||
656 | long compat_get_bitmap(unsigned long *mask, compat_ulong_t __user *umask, | |
657 | unsigned long bitmap_size) | |
658 | { | |
659 | int i, j; | |
660 | unsigned long m; | |
661 | compat_ulong_t um; | |
662 | unsigned long nr_compat_longs; | |
663 | ||
664 | /* align bitmap up to nearest compat_long_t boundary */ | |
665 | bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); | |
666 | ||
667 | if (!access_ok(VERIFY_READ, umask, bitmap_size / 8)) | |
668 | return -EFAULT; | |
669 | ||
670 | nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); | |
671 | ||
672 | for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) { | |
673 | m = 0; | |
674 | ||
675 | for (j = 0; j < sizeof(m)/sizeof(um); j++) { | |
676 | /* | |
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. | |
680 | */ | |
681 | if (nr_compat_longs-- > 0) { | |
682 | if (__get_user(um, umask)) | |
683 | return -EFAULT; | |
684 | } else { | |
685 | um = 0; | |
686 | } | |
687 | ||
688 | umask++; | |
689 | m |= (long)um << (j * BITS_PER_COMPAT_LONG); | |
690 | } | |
691 | *mask++ = m; | |
692 | } | |
693 | ||
694 | return 0; | |
695 | } | |
696 | ||
697 | long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask, | |
698 | unsigned long bitmap_size) | |
699 | { | |
700 | int i, j; | |
701 | unsigned long m; | |
702 | compat_ulong_t um; | |
703 | unsigned long nr_compat_longs; | |
704 | ||
705 | /* align bitmap up to nearest compat_long_t boundary */ | |
706 | bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); | |
707 | ||
708 | if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8)) | |
709 | return -EFAULT; | |
710 | ||
711 | nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); | |
712 | ||
713 | for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) { | |
714 | m = *mask++; | |
715 | ||
716 | for (j = 0; j < sizeof(m)/sizeof(um); j++) { | |
717 | um = m; | |
718 | ||
719 | /* | |
720 | * We dont want to write past the end of the userspace | |
721 | * bitmap. | |
722 | */ | |
723 | if (nr_compat_longs-- > 0) { | |
724 | if (__put_user(um, umask)) | |
725 | return -EFAULT; | |
726 | } | |
727 | ||
728 | umask++; | |
729 | m >>= 4*sizeof(um); | |
730 | m >>= 4*sizeof(um); | |
731 | } | |
732 | } | |
733 | ||
734 | return 0; | |
735 | } | |
736 | ||
737 | void | |
738 | sigset_from_compat (sigset_t *set, compat_sigset_t *compat) | |
739 | { | |
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 ); | |
746 | #else | |
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 ); | |
751 | #endif | |
752 | } | |
753 | } | |
754 | ||
755 | asmlinkage long | |
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) | |
759 | { | |
760 | compat_sigset_t s32; | |
761 | sigset_t s; | |
762 | int sig; | |
763 | struct timespec t; | |
764 | siginfo_t info; | |
765 | long ret, timeout = 0; | |
766 | ||
767 | if (sigsetsize != sizeof(sigset_t)) | |
768 | return -EINVAL; | |
769 | ||
770 | if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t))) | |
771 | return -EFAULT; | |
772 | sigset_from_compat(&s, &s32); | |
773 | sigdelsetmask(&s,sigmask(SIGKILL)|sigmask(SIGSTOP)); | |
774 | signotset(&s); | |
775 | ||
776 | if (uts) { | |
777 | if (get_compat_timespec (&t, uts)) | |
778 | return -EFAULT; | |
779 | if (t.tv_nsec >= 1000000000L || t.tv_nsec < 0 | |
780 | || t.tv_sec < 0) | |
781 | return -EINVAL; | |
782 | } | |
783 | ||
784 | spin_lock_irq(¤t->sighand->siglock); | |
785 | sig = dequeue_signal(current, &s, &info); | |
786 | if (!sig) { | |
787 | timeout = MAX_SCHEDULE_TIMEOUT; | |
788 | if (uts) | |
789 | timeout = timespec_to_jiffies(&t) | |
790 | +(t.tv_sec || t.tv_nsec); | |
791 | if (timeout) { | |
792 | current->real_blocked = current->blocked; | |
793 | sigandsets(¤t->blocked, ¤t->blocked, &s); | |
794 | ||
795 | recalc_sigpending(); | |
796 | spin_unlock_irq(¤t->sighand->siglock); | |
797 | ||
798 | current->state = TASK_INTERRUPTIBLE; | |
799 | timeout = schedule_timeout(timeout); | |
800 | ||
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); | |
805 | recalc_sigpending(); | |
806 | } | |
807 | } | |
808 | spin_unlock_irq(¤t->sighand->siglock); | |
809 | ||
810 | if (sig) { | |
811 | ret = sig; | |
812 | if (uinfo) { | |
813 | if (copy_siginfo_to_user32(uinfo, &info)) | |
814 | ret = -EFAULT; | |
815 | } | |
816 | }else { | |
817 | ret = timeout?-EINTR:-EAGAIN; | |
818 | } | |
819 | return ret; | |
820 | ||
821 | } | |
822 | ||
823 | #ifdef __ARCH_WANT_COMPAT_SYS_TIME | |
824 | ||
825 | /* compat_time_t is a 32 bit "long" and needs to get converted. */ | |
826 | ||
827 | asmlinkage long compat_sys_time(compat_time_t __user * tloc) | |
828 | { | |
829 | compat_time_t i; | |
830 | struct timeval tv; | |
831 | ||
832 | do_gettimeofday(&tv); | |
833 | i = tv.tv_sec; | |
834 | ||
835 | if (tloc) { | |
836 | if (put_user(i,tloc)) | |
837 | i = -EFAULT; | |
838 | } | |
839 | return i; | |
840 | } | |
841 | ||
842 | asmlinkage long compat_sys_stime(compat_time_t __user *tptr) | |
843 | { | |
844 | struct timespec tv; | |
845 | int err; | |
846 | ||
847 | if (get_user(tv.tv_sec, tptr)) | |
848 | return -EFAULT; | |
849 | ||
850 | tv.tv_nsec = 0; | |
851 | ||
852 | err = security_settime(&tv, NULL); | |
853 | if (err) | |
854 | return err; | |
855 | ||
856 | do_settimeofday(&tv); | |
857 | return 0; | |
858 | } | |
859 | ||
860 | #endif /* __ARCH_WANT_COMPAT_SYS_TIME */ |