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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 | ||
75bcc8c5 | 51 | expire = schedule_timeout_interruptible(expire - now); |
1da177e4 LT |
52 | if (expire == 0) |
53 | return 0; | |
54 | ||
55 | rmtp = (struct compat_timespec __user *)restart->arg1; | |
56 | if (rmtp) { | |
57 | struct compat_timespec ct; | |
58 | struct timespec t; | |
59 | ||
60 | jiffies_to_timespec(expire, &t); | |
61 | ct.tv_sec = t.tv_sec; | |
62 | ct.tv_nsec = t.tv_nsec; | |
63 | if (copy_to_user(rmtp, &ct, sizeof(ct))) | |
64 | return -EFAULT; | |
65 | } | |
66 | /* The 'restart' block is already filled in */ | |
67 | return -ERESTART_RESTARTBLOCK; | |
68 | } | |
69 | ||
70 | asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp, | |
71 | struct compat_timespec __user *rmtp) | |
72 | { | |
73 | struct timespec t; | |
74 | struct restart_block *restart; | |
75 | unsigned long expire; | |
76 | ||
77 | if (get_compat_timespec(&t, rqtp)) | |
78 | return -EFAULT; | |
79 | ||
80 | if ((t.tv_nsec >= 1000000000L) || (t.tv_nsec < 0) || (t.tv_sec < 0)) | |
81 | return -EINVAL; | |
82 | ||
83 | expire = timespec_to_jiffies(&t) + (t.tv_sec || t.tv_nsec); | |
75bcc8c5 | 84 | expire = schedule_timeout_interruptible(expire); |
1da177e4 LT |
85 | if (expire == 0) |
86 | return 0; | |
87 | ||
88 | if (rmtp) { | |
89 | jiffies_to_timespec(expire, &t); | |
90 | if (put_compat_timespec(&t, rmtp)) | |
91 | return -EFAULT; | |
92 | } | |
93 | restart = ¤t_thread_info()->restart_block; | |
94 | restart->fn = compat_nanosleep_restart; | |
95 | restart->arg0 = jiffies + expire; | |
96 | restart->arg1 = (unsigned long) rmtp; | |
97 | return -ERESTART_RESTARTBLOCK; | |
98 | } | |
99 | ||
100 | static inline long get_compat_itimerval(struct itimerval *o, | |
101 | struct compat_itimerval __user *i) | |
102 | { | |
103 | return (!access_ok(VERIFY_READ, i, sizeof(*i)) || | |
104 | (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) | | |
105 | __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) | | |
106 | __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) | | |
107 | __get_user(o->it_value.tv_usec, &i->it_value.tv_usec))); | |
108 | } | |
109 | ||
110 | static inline long put_compat_itimerval(struct compat_itimerval __user *o, | |
111 | struct itimerval *i) | |
112 | { | |
113 | return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) || | |
114 | (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) | | |
115 | __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) | | |
116 | __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) | | |
117 | __put_user(i->it_value.tv_usec, &o->it_value.tv_usec))); | |
118 | } | |
119 | ||
120 | asmlinkage long compat_sys_getitimer(int which, | |
121 | struct compat_itimerval __user *it) | |
122 | { | |
123 | struct itimerval kit; | |
124 | int error; | |
125 | ||
126 | error = do_getitimer(which, &kit); | |
127 | if (!error && put_compat_itimerval(it, &kit)) | |
128 | error = -EFAULT; | |
129 | return error; | |
130 | } | |
131 | ||
132 | asmlinkage long compat_sys_setitimer(int which, | |
133 | struct compat_itimerval __user *in, | |
134 | struct compat_itimerval __user *out) | |
135 | { | |
136 | struct itimerval kin, kout; | |
137 | int error; | |
138 | ||
139 | if (in) { | |
140 | if (get_compat_itimerval(&kin, in)) | |
141 | return -EFAULT; | |
142 | } else | |
143 | memset(&kin, 0, sizeof(kin)); | |
144 | ||
145 | error = do_setitimer(which, &kin, out ? &kout : NULL); | |
146 | if (error || !out) | |
147 | return error; | |
148 | if (put_compat_itimerval(out, &kout)) | |
149 | return -EFAULT; | |
150 | return 0; | |
151 | } | |
152 | ||
153 | asmlinkage long compat_sys_times(struct compat_tms __user *tbuf) | |
154 | { | |
155 | /* | |
156 | * In the SMP world we might just be unlucky and have one of | |
157 | * the times increment as we use it. Since the value is an | |
158 | * atomically safe type this is just fine. Conceptually its | |
159 | * as if the syscall took an instant longer to occur. | |
160 | */ | |
161 | if (tbuf) { | |
162 | struct compat_tms tmp; | |
163 | struct task_struct *tsk = current; | |
164 | struct task_struct *t; | |
165 | cputime_t utime, stime, cutime, cstime; | |
166 | ||
167 | read_lock(&tasklist_lock); | |
168 | utime = tsk->signal->utime; | |
169 | stime = tsk->signal->stime; | |
170 | t = tsk; | |
171 | do { | |
172 | utime = cputime_add(utime, t->utime); | |
173 | stime = cputime_add(stime, t->stime); | |
174 | t = next_thread(t); | |
175 | } while (t != tsk); | |
176 | ||
177 | /* | |
178 | * While we have tasklist_lock read-locked, no dying thread | |
179 | * can be updating current->signal->[us]time. Instead, | |
180 | * we got their counts included in the live thread loop. | |
181 | * However, another thread can come in right now and | |
182 | * do a wait call that updates current->signal->c[us]time. | |
183 | * To make sure we always see that pair updated atomically, | |
184 | * we take the siglock around fetching them. | |
185 | */ | |
186 | spin_lock_irq(&tsk->sighand->siglock); | |
187 | cutime = tsk->signal->cutime; | |
188 | cstime = tsk->signal->cstime; | |
189 | spin_unlock_irq(&tsk->sighand->siglock); | |
190 | read_unlock(&tasklist_lock); | |
191 | ||
192 | tmp.tms_utime = compat_jiffies_to_clock_t(cputime_to_jiffies(utime)); | |
193 | tmp.tms_stime = compat_jiffies_to_clock_t(cputime_to_jiffies(stime)); | |
194 | tmp.tms_cutime = compat_jiffies_to_clock_t(cputime_to_jiffies(cutime)); | |
195 | tmp.tms_cstime = compat_jiffies_to_clock_t(cputime_to_jiffies(cstime)); | |
196 | if (copy_to_user(tbuf, &tmp, sizeof(tmp))) | |
197 | return -EFAULT; | |
198 | } | |
199 | return compat_jiffies_to_clock_t(jiffies); | |
200 | } | |
201 | ||
202 | /* | |
203 | * Assumption: old_sigset_t and compat_old_sigset_t are both | |
204 | * types that can be passed to put_user()/get_user(). | |
205 | */ | |
206 | ||
207 | asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set) | |
208 | { | |
209 | old_sigset_t s; | |
210 | long ret; | |
211 | mm_segment_t old_fs = get_fs(); | |
212 | ||
213 | set_fs(KERNEL_DS); | |
214 | ret = sys_sigpending((old_sigset_t __user *) &s); | |
215 | set_fs(old_fs); | |
216 | if (ret == 0) | |
217 | ret = put_user(s, set); | |
218 | return ret; | |
219 | } | |
220 | ||
221 | asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *set, | |
222 | compat_old_sigset_t __user *oset) | |
223 | { | |
224 | old_sigset_t s; | |
225 | long ret; | |
226 | mm_segment_t old_fs; | |
227 | ||
228 | if (set && get_user(s, set)) | |
229 | return -EFAULT; | |
230 | old_fs = get_fs(); | |
231 | set_fs(KERNEL_DS); | |
232 | ret = sys_sigprocmask(how, | |
233 | set ? (old_sigset_t __user *) &s : NULL, | |
234 | oset ? (old_sigset_t __user *) &s : NULL); | |
235 | set_fs(old_fs); | |
236 | if (ret == 0) | |
237 | if (oset) | |
238 | ret = put_user(s, oset); | |
239 | return ret; | |
240 | } | |
241 | ||
242 | #ifdef CONFIG_FUTEX | |
243 | asmlinkage long compat_sys_futex(u32 __user *uaddr, int op, int val, | |
244 | struct compat_timespec __user *utime, u32 __user *uaddr2, | |
245 | int val3) | |
246 | { | |
247 | struct timespec t; | |
248 | unsigned long timeout = MAX_SCHEDULE_TIMEOUT; | |
249 | int val2 = 0; | |
250 | ||
251 | if ((op == FUTEX_WAIT) && utime) { | |
252 | if (get_compat_timespec(&t, utime)) | |
253 | return -EFAULT; | |
254 | timeout = timespec_to_jiffies(&t) + 1; | |
255 | } | |
256 | if (op >= FUTEX_REQUEUE) | |
257 | val2 = (int) (unsigned long) utime; | |
258 | ||
259 | return do_futex((unsigned long)uaddr, op, val, timeout, | |
260 | (unsigned long)uaddr2, val2, val3); | |
261 | } | |
262 | #endif | |
263 | ||
264 | asmlinkage long compat_sys_setrlimit(unsigned int resource, | |
265 | struct compat_rlimit __user *rlim) | |
266 | { | |
267 | struct rlimit r; | |
268 | int ret; | |
269 | mm_segment_t old_fs = get_fs (); | |
270 | ||
271 | if (resource >= RLIM_NLIMITS) | |
272 | return -EINVAL; | |
273 | ||
274 | if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) || | |
275 | __get_user(r.rlim_cur, &rlim->rlim_cur) || | |
276 | __get_user(r.rlim_max, &rlim->rlim_max)) | |
277 | return -EFAULT; | |
278 | ||
279 | if (r.rlim_cur == COMPAT_RLIM_INFINITY) | |
280 | r.rlim_cur = RLIM_INFINITY; | |
281 | if (r.rlim_max == COMPAT_RLIM_INFINITY) | |
282 | r.rlim_max = RLIM_INFINITY; | |
283 | set_fs(KERNEL_DS); | |
284 | ret = sys_setrlimit(resource, (struct rlimit __user *) &r); | |
285 | set_fs(old_fs); | |
286 | return ret; | |
287 | } | |
288 | ||
289 | #ifdef COMPAT_RLIM_OLD_INFINITY | |
290 | ||
291 | asmlinkage long compat_sys_old_getrlimit(unsigned int resource, | |
292 | struct compat_rlimit __user *rlim) | |
293 | { | |
294 | struct rlimit r; | |
295 | int ret; | |
296 | mm_segment_t old_fs = get_fs(); | |
297 | ||
298 | set_fs(KERNEL_DS); | |
299 | ret = sys_old_getrlimit(resource, &r); | |
300 | set_fs(old_fs); | |
301 | ||
302 | if (!ret) { | |
303 | if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY) | |
304 | r.rlim_cur = COMPAT_RLIM_INFINITY; | |
305 | if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY) | |
306 | r.rlim_max = COMPAT_RLIM_INFINITY; | |
307 | ||
308 | if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) || | |
309 | __put_user(r.rlim_cur, &rlim->rlim_cur) || | |
310 | __put_user(r.rlim_max, &rlim->rlim_max)) | |
311 | return -EFAULT; | |
312 | } | |
313 | return ret; | |
314 | } | |
315 | ||
316 | #endif | |
317 | ||
318 | asmlinkage long compat_sys_getrlimit (unsigned int resource, | |
319 | struct compat_rlimit __user *rlim) | |
320 | { | |
321 | struct rlimit r; | |
322 | int ret; | |
323 | mm_segment_t old_fs = get_fs(); | |
324 | ||
325 | set_fs(KERNEL_DS); | |
326 | ret = sys_getrlimit(resource, (struct rlimit __user *) &r); | |
327 | set_fs(old_fs); | |
328 | if (!ret) { | |
329 | if (r.rlim_cur > COMPAT_RLIM_INFINITY) | |
330 | r.rlim_cur = COMPAT_RLIM_INFINITY; | |
331 | if (r.rlim_max > COMPAT_RLIM_INFINITY) | |
332 | r.rlim_max = COMPAT_RLIM_INFINITY; | |
333 | ||
334 | if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) || | |
335 | __put_user(r.rlim_cur, &rlim->rlim_cur) || | |
336 | __put_user(r.rlim_max, &rlim->rlim_max)) | |
337 | return -EFAULT; | |
338 | } | |
339 | return ret; | |
340 | } | |
341 | ||
342 | int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru) | |
343 | { | |
344 | if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) || | |
345 | __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) || | |
346 | __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) || | |
347 | __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) || | |
348 | __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) || | |
349 | __put_user(r->ru_maxrss, &ru->ru_maxrss) || | |
350 | __put_user(r->ru_ixrss, &ru->ru_ixrss) || | |
351 | __put_user(r->ru_idrss, &ru->ru_idrss) || | |
352 | __put_user(r->ru_isrss, &ru->ru_isrss) || | |
353 | __put_user(r->ru_minflt, &ru->ru_minflt) || | |
354 | __put_user(r->ru_majflt, &ru->ru_majflt) || | |
355 | __put_user(r->ru_nswap, &ru->ru_nswap) || | |
356 | __put_user(r->ru_inblock, &ru->ru_inblock) || | |
357 | __put_user(r->ru_oublock, &ru->ru_oublock) || | |
358 | __put_user(r->ru_msgsnd, &ru->ru_msgsnd) || | |
359 | __put_user(r->ru_msgrcv, &ru->ru_msgrcv) || | |
360 | __put_user(r->ru_nsignals, &ru->ru_nsignals) || | |
361 | __put_user(r->ru_nvcsw, &ru->ru_nvcsw) || | |
362 | __put_user(r->ru_nivcsw, &ru->ru_nivcsw)) | |
363 | return -EFAULT; | |
364 | return 0; | |
365 | } | |
366 | ||
367 | asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru) | |
368 | { | |
369 | struct rusage r; | |
370 | int ret; | |
371 | mm_segment_t old_fs = get_fs(); | |
372 | ||
373 | set_fs(KERNEL_DS); | |
374 | ret = sys_getrusage(who, (struct rusage __user *) &r); | |
375 | set_fs(old_fs); | |
376 | ||
377 | if (ret) | |
378 | return ret; | |
379 | ||
380 | if (put_compat_rusage(&r, ru)) | |
381 | return -EFAULT; | |
382 | ||
383 | return 0; | |
384 | } | |
385 | ||
386 | asmlinkage long | |
387 | compat_sys_wait4(compat_pid_t pid, compat_uint_t __user *stat_addr, int options, | |
388 | struct compat_rusage __user *ru) | |
389 | { | |
390 | if (!ru) { | |
391 | return sys_wait4(pid, stat_addr, options, NULL); | |
392 | } else { | |
393 | struct rusage r; | |
394 | int ret; | |
395 | unsigned int status; | |
396 | mm_segment_t old_fs = get_fs(); | |
397 | ||
398 | set_fs (KERNEL_DS); | |
399 | ret = sys_wait4(pid, | |
400 | (stat_addr ? | |
401 | (unsigned int __user *) &status : NULL), | |
402 | options, (struct rusage __user *) &r); | |
403 | set_fs (old_fs); | |
404 | ||
405 | if (ret > 0) { | |
406 | if (put_compat_rusage(&r, ru)) | |
407 | return -EFAULT; | |
408 | if (stat_addr && put_user(status, stat_addr)) | |
409 | return -EFAULT; | |
410 | } | |
411 | return ret; | |
412 | } | |
413 | } | |
414 | ||
415 | asmlinkage long compat_sys_waitid(int which, compat_pid_t pid, | |
416 | struct compat_siginfo __user *uinfo, int options, | |
417 | struct compat_rusage __user *uru) | |
418 | { | |
419 | siginfo_t info; | |
420 | struct rusage ru; | |
421 | long ret; | |
422 | mm_segment_t old_fs = get_fs(); | |
423 | ||
424 | memset(&info, 0, sizeof(info)); | |
425 | ||
426 | set_fs(KERNEL_DS); | |
427 | ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options, | |
428 | uru ? (struct rusage __user *)&ru : NULL); | |
429 | set_fs(old_fs); | |
430 | ||
431 | if ((ret < 0) || (info.si_signo == 0)) | |
432 | return ret; | |
433 | ||
434 | if (uru) { | |
435 | ret = put_compat_rusage(&ru, uru); | |
436 | if (ret) | |
437 | return ret; | |
438 | } | |
439 | ||
440 | BUG_ON(info.si_code & __SI_MASK); | |
441 | info.si_code |= __SI_CHLD; | |
442 | return copy_siginfo_to_user32(uinfo, &info); | |
443 | } | |
444 | ||
445 | static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr, | |
446 | unsigned len, cpumask_t *new_mask) | |
447 | { | |
448 | unsigned long *k; | |
449 | ||
450 | if (len < sizeof(cpumask_t)) | |
451 | memset(new_mask, 0, sizeof(cpumask_t)); | |
452 | else if (len > sizeof(cpumask_t)) | |
453 | len = sizeof(cpumask_t); | |
454 | ||
455 | k = cpus_addr(*new_mask); | |
456 | return compat_get_bitmap(k, user_mask_ptr, len * 8); | |
457 | } | |
458 | ||
459 | asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid, | |
460 | unsigned int len, | |
461 | compat_ulong_t __user *user_mask_ptr) | |
462 | { | |
463 | cpumask_t new_mask; | |
464 | int retval; | |
465 | ||
466 | retval = compat_get_user_cpu_mask(user_mask_ptr, len, &new_mask); | |
467 | if (retval) | |
468 | return retval; | |
469 | ||
470 | return sched_setaffinity(pid, new_mask); | |
471 | } | |
472 | ||
473 | asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len, | |
474 | compat_ulong_t __user *user_mask_ptr) | |
475 | { | |
476 | int ret; | |
477 | cpumask_t mask; | |
478 | unsigned long *k; | |
479 | unsigned int min_length = sizeof(cpumask_t); | |
480 | ||
481 | if (NR_CPUS <= BITS_PER_COMPAT_LONG) | |
482 | min_length = sizeof(compat_ulong_t); | |
483 | ||
484 | if (len < min_length) | |
485 | return -EINVAL; | |
486 | ||
487 | ret = sched_getaffinity(pid, &mask); | |
488 | if (ret < 0) | |
489 | return ret; | |
490 | ||
491 | k = cpus_addr(mask); | |
492 | ret = compat_put_bitmap(user_mask_ptr, k, min_length * 8); | |
493 | if (ret) | |
494 | return ret; | |
495 | ||
496 | return min_length; | |
497 | } | |
498 | ||
499 | static int get_compat_itimerspec(struct itimerspec *dst, | |
500 | struct compat_itimerspec __user *src) | |
501 | { | |
502 | if (get_compat_timespec(&dst->it_interval, &src->it_interval) || | |
503 | get_compat_timespec(&dst->it_value, &src->it_value)) | |
504 | return -EFAULT; | |
505 | return 0; | |
506 | } | |
507 | ||
508 | static int put_compat_itimerspec(struct compat_itimerspec __user *dst, | |
509 | struct itimerspec *src) | |
510 | { | |
511 | if (put_compat_timespec(&src->it_interval, &dst->it_interval) || | |
512 | put_compat_timespec(&src->it_value, &dst->it_value)) | |
513 | return -EFAULT; | |
514 | return 0; | |
515 | } | |
516 | ||
3a0f69d5 CH |
517 | long compat_sys_timer_create(clockid_t which_clock, |
518 | struct compat_sigevent __user *timer_event_spec, | |
519 | timer_t __user *created_timer_id) | |
520 | { | |
521 | struct sigevent __user *event = NULL; | |
522 | ||
523 | if (timer_event_spec) { | |
524 | struct sigevent kevent; | |
525 | ||
526 | event = compat_alloc_user_space(sizeof(*event)); | |
527 | if (get_compat_sigevent(&kevent, timer_event_spec) || | |
528 | copy_to_user(event, &kevent, sizeof(*event))) | |
529 | return -EFAULT; | |
530 | } | |
531 | ||
532 | return sys_timer_create(which_clock, event, created_timer_id); | |
533 | } | |
534 | ||
1da177e4 LT |
535 | long compat_sys_timer_settime(timer_t timer_id, int flags, |
536 | struct compat_itimerspec __user *new, | |
537 | struct compat_itimerspec __user *old) | |
538 | { | |
539 | long err; | |
540 | mm_segment_t oldfs; | |
541 | struct itimerspec newts, oldts; | |
542 | ||
543 | if (!new) | |
544 | return -EINVAL; | |
545 | if (get_compat_itimerspec(&newts, new)) | |
546 | return -EFAULT; | |
547 | oldfs = get_fs(); | |
548 | set_fs(KERNEL_DS); | |
549 | err = sys_timer_settime(timer_id, flags, | |
550 | (struct itimerspec __user *) &newts, | |
551 | (struct itimerspec __user *) &oldts); | |
552 | set_fs(oldfs); | |
553 | if (!err && old && put_compat_itimerspec(old, &oldts)) | |
554 | return -EFAULT; | |
555 | return err; | |
556 | } | |
557 | ||
558 | long compat_sys_timer_gettime(timer_t timer_id, | |
559 | struct compat_itimerspec __user *setting) | |
560 | { | |
561 | long err; | |
562 | mm_segment_t oldfs; | |
563 | struct itimerspec ts; | |
564 | ||
565 | oldfs = get_fs(); | |
566 | set_fs(KERNEL_DS); | |
567 | err = sys_timer_gettime(timer_id, | |
568 | (struct itimerspec __user *) &ts); | |
569 | set_fs(oldfs); | |
570 | if (!err && put_compat_itimerspec(setting, &ts)) | |
571 | return -EFAULT; | |
572 | return err; | |
573 | } | |
574 | ||
575 | long compat_sys_clock_settime(clockid_t which_clock, | |
576 | struct compat_timespec __user *tp) | |
577 | { | |
578 | long err; | |
579 | mm_segment_t oldfs; | |
580 | struct timespec ts; | |
581 | ||
582 | if (get_compat_timespec(&ts, tp)) | |
583 | return -EFAULT; | |
584 | oldfs = get_fs(); | |
585 | set_fs(KERNEL_DS); | |
586 | err = sys_clock_settime(which_clock, | |
587 | (struct timespec __user *) &ts); | |
588 | set_fs(oldfs); | |
589 | return err; | |
590 | } | |
591 | ||
592 | long compat_sys_clock_gettime(clockid_t which_clock, | |
593 | struct compat_timespec __user *tp) | |
594 | { | |
595 | long err; | |
596 | mm_segment_t oldfs; | |
597 | struct timespec ts; | |
598 | ||
599 | oldfs = get_fs(); | |
600 | set_fs(KERNEL_DS); | |
601 | err = sys_clock_gettime(which_clock, | |
602 | (struct timespec __user *) &ts); | |
603 | set_fs(oldfs); | |
604 | if (!err && put_compat_timespec(&ts, tp)) | |
605 | return -EFAULT; | |
606 | return err; | |
607 | } | |
608 | ||
609 | long compat_sys_clock_getres(clockid_t which_clock, | |
610 | struct compat_timespec __user *tp) | |
611 | { | |
612 | long err; | |
613 | mm_segment_t oldfs; | |
614 | struct timespec ts; | |
615 | ||
616 | oldfs = get_fs(); | |
617 | set_fs(KERNEL_DS); | |
618 | err = sys_clock_getres(which_clock, | |
619 | (struct timespec __user *) &ts); | |
620 | set_fs(oldfs); | |
621 | if (!err && tp && put_compat_timespec(&ts, tp)) | |
622 | return -EFAULT; | |
623 | return err; | |
624 | } | |
625 | ||
626 | long compat_sys_clock_nanosleep(clockid_t which_clock, int flags, | |
627 | struct compat_timespec __user *rqtp, | |
628 | struct compat_timespec __user *rmtp) | |
629 | { | |
630 | long err; | |
631 | mm_segment_t oldfs; | |
632 | struct timespec in, out; | |
633 | ||
634 | if (get_compat_timespec(&in, rqtp)) | |
635 | return -EFAULT; | |
636 | ||
637 | oldfs = get_fs(); | |
638 | set_fs(KERNEL_DS); | |
639 | err = sys_clock_nanosleep(which_clock, flags, | |
640 | (struct timespec __user *) &in, | |
641 | (struct timespec __user *) &out); | |
642 | set_fs(oldfs); | |
643 | if ((err == -ERESTART_RESTARTBLOCK) && rmtp && | |
644 | put_compat_timespec(&out, rmtp)) | |
645 | return -EFAULT; | |
646 | return err; | |
647 | } | |
648 | ||
649 | /* | |
650 | * We currently only need the following fields from the sigevent | |
651 | * structure: sigev_value, sigev_signo, sig_notify and (sometimes | |
652 | * sigev_notify_thread_id). The others are handled in user mode. | |
653 | * We also assume that copying sigev_value.sival_int is sufficient | |
654 | * to keep all the bits of sigev_value.sival_ptr intact. | |
655 | */ | |
656 | int get_compat_sigevent(struct sigevent *event, | |
657 | const struct compat_sigevent __user *u_event) | |
658 | { | |
51410d3c | 659 | memset(event, 0, sizeof(*event)); |
1da177e4 LT |
660 | return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) || |
661 | __get_user(event->sigev_value.sival_int, | |
662 | &u_event->sigev_value.sival_int) || | |
663 | __get_user(event->sigev_signo, &u_event->sigev_signo) || | |
664 | __get_user(event->sigev_notify, &u_event->sigev_notify) || | |
665 | __get_user(event->sigev_notify_thread_id, | |
666 | &u_event->sigev_notify_thread_id)) | |
667 | ? -EFAULT : 0; | |
668 | } | |
669 | ||
1da177e4 LT |
670 | long compat_get_bitmap(unsigned long *mask, compat_ulong_t __user *umask, |
671 | unsigned long bitmap_size) | |
672 | { | |
673 | int i, j; | |
674 | unsigned long m; | |
675 | compat_ulong_t um; | |
676 | unsigned long nr_compat_longs; | |
677 | ||
678 | /* align bitmap up to nearest compat_long_t boundary */ | |
679 | bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); | |
680 | ||
681 | if (!access_ok(VERIFY_READ, umask, bitmap_size / 8)) | |
682 | return -EFAULT; | |
683 | ||
684 | nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); | |
685 | ||
686 | for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) { | |
687 | m = 0; | |
688 | ||
689 | for (j = 0; j < sizeof(m)/sizeof(um); j++) { | |
690 | /* | |
691 | * We dont want to read past the end of the userspace | |
692 | * bitmap. We must however ensure the end of the | |
693 | * kernel bitmap is zeroed. | |
694 | */ | |
695 | if (nr_compat_longs-- > 0) { | |
696 | if (__get_user(um, umask)) | |
697 | return -EFAULT; | |
698 | } else { | |
699 | um = 0; | |
700 | } | |
701 | ||
702 | umask++; | |
703 | m |= (long)um << (j * BITS_PER_COMPAT_LONG); | |
704 | } | |
705 | *mask++ = m; | |
706 | } | |
707 | ||
708 | return 0; | |
709 | } | |
710 | ||
711 | long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask, | |
712 | unsigned long bitmap_size) | |
713 | { | |
714 | int i, j; | |
715 | unsigned long m; | |
716 | compat_ulong_t um; | |
717 | unsigned long nr_compat_longs; | |
718 | ||
719 | /* align bitmap up to nearest compat_long_t boundary */ | |
720 | bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); | |
721 | ||
722 | if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8)) | |
723 | return -EFAULT; | |
724 | ||
725 | nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); | |
726 | ||
727 | for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) { | |
728 | m = *mask++; | |
729 | ||
730 | for (j = 0; j < sizeof(m)/sizeof(um); j++) { | |
731 | um = m; | |
732 | ||
733 | /* | |
734 | * We dont want to write past the end of the userspace | |
735 | * bitmap. | |
736 | */ | |
737 | if (nr_compat_longs-- > 0) { | |
738 | if (__put_user(um, umask)) | |
739 | return -EFAULT; | |
740 | } | |
741 | ||
742 | umask++; | |
743 | m >>= 4*sizeof(um); | |
744 | m >>= 4*sizeof(um); | |
745 | } | |
746 | } | |
747 | ||
748 | return 0; | |
749 | } | |
750 | ||
751 | void | |
752 | sigset_from_compat (sigset_t *set, compat_sigset_t *compat) | |
753 | { | |
754 | switch (_NSIG_WORDS) { | |
755 | #if defined (__COMPAT_ENDIAN_SWAP__) | |
756 | case 4: set->sig[3] = compat->sig[7] | (((long)compat->sig[6]) << 32 ); | |
757 | case 3: set->sig[2] = compat->sig[5] | (((long)compat->sig[4]) << 32 ); | |
758 | case 2: set->sig[1] = compat->sig[3] | (((long)compat->sig[2]) << 32 ); | |
759 | case 1: set->sig[0] = compat->sig[1] | (((long)compat->sig[0]) << 32 ); | |
760 | #else | |
761 | case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 ); | |
762 | case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 ); | |
763 | case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 ); | |
764 | case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 ); | |
765 | #endif | |
766 | } | |
767 | } | |
768 | ||
769 | asmlinkage long | |
770 | compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese, | |
771 | struct compat_siginfo __user *uinfo, | |
772 | struct compat_timespec __user *uts, compat_size_t sigsetsize) | |
773 | { | |
774 | compat_sigset_t s32; | |
775 | sigset_t s; | |
776 | int sig; | |
777 | struct timespec t; | |
778 | siginfo_t info; | |
779 | long ret, timeout = 0; | |
780 | ||
781 | if (sigsetsize != sizeof(sigset_t)) | |
782 | return -EINVAL; | |
783 | ||
784 | if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t))) | |
785 | return -EFAULT; | |
786 | sigset_from_compat(&s, &s32); | |
787 | sigdelsetmask(&s,sigmask(SIGKILL)|sigmask(SIGSTOP)); | |
788 | signotset(&s); | |
789 | ||
790 | if (uts) { | |
791 | if (get_compat_timespec (&t, uts)) | |
792 | return -EFAULT; | |
793 | if (t.tv_nsec >= 1000000000L || t.tv_nsec < 0 | |
794 | || t.tv_sec < 0) | |
795 | return -EINVAL; | |
796 | } | |
797 | ||
798 | spin_lock_irq(¤t->sighand->siglock); | |
799 | sig = dequeue_signal(current, &s, &info); | |
800 | if (!sig) { | |
801 | timeout = MAX_SCHEDULE_TIMEOUT; | |
802 | if (uts) | |
803 | timeout = timespec_to_jiffies(&t) | |
804 | +(t.tv_sec || t.tv_nsec); | |
805 | if (timeout) { | |
806 | current->real_blocked = current->blocked; | |
807 | sigandsets(¤t->blocked, ¤t->blocked, &s); | |
808 | ||
809 | recalc_sigpending(); | |
810 | spin_unlock_irq(¤t->sighand->siglock); | |
811 | ||
75bcc8c5 | 812 | timeout = schedule_timeout_interruptible(timeout); |
1da177e4 LT |
813 | |
814 | spin_lock_irq(¤t->sighand->siglock); | |
815 | sig = dequeue_signal(current, &s, &info); | |
816 | current->blocked = current->real_blocked; | |
817 | siginitset(¤t->real_blocked, 0); | |
818 | recalc_sigpending(); | |
819 | } | |
820 | } | |
821 | spin_unlock_irq(¤t->sighand->siglock); | |
822 | ||
823 | if (sig) { | |
824 | ret = sig; | |
825 | if (uinfo) { | |
826 | if (copy_siginfo_to_user32(uinfo, &info)) | |
827 | ret = -EFAULT; | |
828 | } | |
829 | }else { | |
830 | ret = timeout?-EINTR:-EAGAIN; | |
831 | } | |
832 | return ret; | |
833 | ||
834 | } | |
835 | ||
836 | #ifdef __ARCH_WANT_COMPAT_SYS_TIME | |
837 | ||
838 | /* compat_time_t is a 32 bit "long" and needs to get converted. */ | |
839 | ||
840 | asmlinkage long compat_sys_time(compat_time_t __user * tloc) | |
841 | { | |
842 | compat_time_t i; | |
843 | struct timeval tv; | |
844 | ||
845 | do_gettimeofday(&tv); | |
846 | i = tv.tv_sec; | |
847 | ||
848 | if (tloc) { | |
849 | if (put_user(i,tloc)) | |
850 | i = -EFAULT; | |
851 | } | |
852 | return i; | |
853 | } | |
854 | ||
855 | asmlinkage long compat_sys_stime(compat_time_t __user *tptr) | |
856 | { | |
857 | struct timespec tv; | |
858 | int err; | |
859 | ||
860 | if (get_user(tv.tv_sec, tptr)) | |
861 | return -EFAULT; | |
862 | ||
863 | tv.tv_nsec = 0; | |
864 | ||
865 | err = security_settime(&tv, NULL); | |
866 | if (err) | |
867 | return err; | |
868 | ||
869 | do_settimeofday(&tv); | |
870 | return 0; | |
871 | } | |
872 | ||
873 | #endif /* __ARCH_WANT_COMPAT_SYS_TIME */ |