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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/syscalls.h> | |
21 | #include <linux/unistd.h> | |
22 | #include <linux/security.h> | |
23 | #include <linux/timex.h> | |
24 | #include <linux/export.h> | |
25 | #include <linux/migrate.h> | |
26 | #include <linux/posix-timers.h> | |
27 | #include <linux/times.h> | |
28 | #include <linux/ptrace.h> | |
29 | #include <linux/gfp.h> | |
30 | ||
31 | #include <linux/uaccess.h> | |
32 | ||
33 | static int compat_get_timex(struct timex *txc, struct compat_timex __user *utp) | |
34 | { | |
35 | memset(txc, 0, sizeof(struct timex)); | |
36 | ||
37 | if (!access_ok(VERIFY_READ, utp, sizeof(struct compat_timex)) || | |
38 | __get_user(txc->modes, &utp->modes) || | |
39 | __get_user(txc->offset, &utp->offset) || | |
40 | __get_user(txc->freq, &utp->freq) || | |
41 | __get_user(txc->maxerror, &utp->maxerror) || | |
42 | __get_user(txc->esterror, &utp->esterror) || | |
43 | __get_user(txc->status, &utp->status) || | |
44 | __get_user(txc->constant, &utp->constant) || | |
45 | __get_user(txc->precision, &utp->precision) || | |
46 | __get_user(txc->tolerance, &utp->tolerance) || | |
47 | __get_user(txc->time.tv_sec, &utp->time.tv_sec) || | |
48 | __get_user(txc->time.tv_usec, &utp->time.tv_usec) || | |
49 | __get_user(txc->tick, &utp->tick) || | |
50 | __get_user(txc->ppsfreq, &utp->ppsfreq) || | |
51 | __get_user(txc->jitter, &utp->jitter) || | |
52 | __get_user(txc->shift, &utp->shift) || | |
53 | __get_user(txc->stabil, &utp->stabil) || | |
54 | __get_user(txc->jitcnt, &utp->jitcnt) || | |
55 | __get_user(txc->calcnt, &utp->calcnt) || | |
56 | __get_user(txc->errcnt, &utp->errcnt) || | |
57 | __get_user(txc->stbcnt, &utp->stbcnt)) | |
58 | return -EFAULT; | |
59 | ||
60 | return 0; | |
61 | } | |
62 | ||
63 | static int compat_put_timex(struct compat_timex __user *utp, struct timex *txc) | |
64 | { | |
65 | if (!access_ok(VERIFY_WRITE, utp, sizeof(struct compat_timex)) || | |
66 | __put_user(txc->modes, &utp->modes) || | |
67 | __put_user(txc->offset, &utp->offset) || | |
68 | __put_user(txc->freq, &utp->freq) || | |
69 | __put_user(txc->maxerror, &utp->maxerror) || | |
70 | __put_user(txc->esterror, &utp->esterror) || | |
71 | __put_user(txc->status, &utp->status) || | |
72 | __put_user(txc->constant, &utp->constant) || | |
73 | __put_user(txc->precision, &utp->precision) || | |
74 | __put_user(txc->tolerance, &utp->tolerance) || | |
75 | __put_user(txc->time.tv_sec, &utp->time.tv_sec) || | |
76 | __put_user(txc->time.tv_usec, &utp->time.tv_usec) || | |
77 | __put_user(txc->tick, &utp->tick) || | |
78 | __put_user(txc->ppsfreq, &utp->ppsfreq) || | |
79 | __put_user(txc->jitter, &utp->jitter) || | |
80 | __put_user(txc->shift, &utp->shift) || | |
81 | __put_user(txc->stabil, &utp->stabil) || | |
82 | __put_user(txc->jitcnt, &utp->jitcnt) || | |
83 | __put_user(txc->calcnt, &utp->calcnt) || | |
84 | __put_user(txc->errcnt, &utp->errcnt) || | |
85 | __put_user(txc->stbcnt, &utp->stbcnt) || | |
86 | __put_user(txc->tai, &utp->tai)) | |
87 | return -EFAULT; | |
88 | return 0; | |
89 | } | |
90 | ||
91 | COMPAT_SYSCALL_DEFINE2(gettimeofday, struct compat_timeval __user *, tv, | |
92 | struct timezone __user *, tz) | |
93 | { | |
94 | if (tv) { | |
95 | struct timeval ktv; | |
96 | do_gettimeofday(&ktv); | |
97 | if (compat_put_timeval(&ktv, tv)) | |
98 | return -EFAULT; | |
99 | } | |
100 | if (tz) { | |
101 | if (copy_to_user(tz, &sys_tz, sizeof(sys_tz))) | |
102 | return -EFAULT; | |
103 | } | |
104 | ||
105 | return 0; | |
106 | } | |
107 | ||
108 | COMPAT_SYSCALL_DEFINE2(settimeofday, struct compat_timeval __user *, tv, | |
109 | struct timezone __user *, tz) | |
110 | { | |
111 | struct timeval user_tv; | |
112 | struct timespec new_ts; | |
113 | struct timezone new_tz; | |
114 | ||
115 | if (tv) { | |
116 | if (compat_get_timeval(&user_tv, tv)) | |
117 | return -EFAULT; | |
118 | new_ts.tv_sec = user_tv.tv_sec; | |
119 | new_ts.tv_nsec = user_tv.tv_usec * NSEC_PER_USEC; | |
120 | } | |
121 | if (tz) { | |
122 | if (copy_from_user(&new_tz, tz, sizeof(*tz))) | |
123 | return -EFAULT; | |
124 | } | |
125 | ||
126 | return do_sys_settimeofday(tv ? &new_ts : NULL, tz ? &new_tz : NULL); | |
127 | } | |
128 | ||
129 | static int __compat_get_timeval(struct timeval *tv, const struct compat_timeval __user *ctv) | |
130 | { | |
131 | return (!access_ok(VERIFY_READ, ctv, sizeof(*ctv)) || | |
132 | __get_user(tv->tv_sec, &ctv->tv_sec) || | |
133 | __get_user(tv->tv_usec, &ctv->tv_usec)) ? -EFAULT : 0; | |
134 | } | |
135 | ||
136 | static int __compat_put_timeval(const struct timeval *tv, struct compat_timeval __user *ctv) | |
137 | { | |
138 | return (!access_ok(VERIFY_WRITE, ctv, sizeof(*ctv)) || | |
139 | __put_user(tv->tv_sec, &ctv->tv_sec) || | |
140 | __put_user(tv->tv_usec, &ctv->tv_usec)) ? -EFAULT : 0; | |
141 | } | |
142 | ||
143 | static int __compat_get_timespec(struct timespec *ts, const struct compat_timespec __user *cts) | |
144 | { | |
145 | return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) || | |
146 | __get_user(ts->tv_sec, &cts->tv_sec) || | |
147 | __get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0; | |
148 | } | |
149 | ||
150 | static int __compat_put_timespec(const struct timespec *ts, struct compat_timespec __user *cts) | |
151 | { | |
152 | return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) || | |
153 | __put_user(ts->tv_sec, &cts->tv_sec) || | |
154 | __put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0; | |
155 | } | |
156 | ||
157 | int compat_get_timeval(struct timeval *tv, const void __user *utv) | |
158 | { | |
159 | if (COMPAT_USE_64BIT_TIME) | |
160 | return copy_from_user(tv, utv, sizeof(*tv)) ? -EFAULT : 0; | |
161 | else | |
162 | return __compat_get_timeval(tv, utv); | |
163 | } | |
164 | EXPORT_SYMBOL_GPL(compat_get_timeval); | |
165 | ||
166 | int compat_put_timeval(const struct timeval *tv, void __user *utv) | |
167 | { | |
168 | if (COMPAT_USE_64BIT_TIME) | |
169 | return copy_to_user(utv, tv, sizeof(*tv)) ? -EFAULT : 0; | |
170 | else | |
171 | return __compat_put_timeval(tv, utv); | |
172 | } | |
173 | EXPORT_SYMBOL_GPL(compat_put_timeval); | |
174 | ||
175 | int compat_get_timespec(struct timespec *ts, const void __user *uts) | |
176 | { | |
177 | if (COMPAT_USE_64BIT_TIME) | |
178 | return copy_from_user(ts, uts, sizeof(*ts)) ? -EFAULT : 0; | |
179 | else | |
180 | return __compat_get_timespec(ts, uts); | |
181 | } | |
182 | EXPORT_SYMBOL_GPL(compat_get_timespec); | |
183 | ||
184 | int compat_put_timespec(const struct timespec *ts, void __user *uts) | |
185 | { | |
186 | if (COMPAT_USE_64BIT_TIME) | |
187 | return copy_to_user(uts, ts, sizeof(*ts)) ? -EFAULT : 0; | |
188 | else | |
189 | return __compat_put_timespec(ts, uts); | |
190 | } | |
191 | EXPORT_SYMBOL_GPL(compat_put_timespec); | |
192 | ||
193 | int compat_convert_timespec(struct timespec __user **kts, | |
194 | const void __user *cts) | |
195 | { | |
196 | struct timespec ts; | |
197 | struct timespec __user *uts; | |
198 | ||
199 | if (!cts || COMPAT_USE_64BIT_TIME) { | |
200 | *kts = (struct timespec __user *)cts; | |
201 | return 0; | |
202 | } | |
203 | ||
204 | uts = compat_alloc_user_space(sizeof(ts)); | |
205 | if (!uts) | |
206 | return -EFAULT; | |
207 | if (compat_get_timespec(&ts, cts)) | |
208 | return -EFAULT; | |
209 | if (copy_to_user(uts, &ts, sizeof(ts))) | |
210 | return -EFAULT; | |
211 | ||
212 | *kts = uts; | |
213 | return 0; | |
214 | } | |
215 | ||
216 | static long compat_nanosleep_restart(struct restart_block *restart) | |
217 | { | |
218 | struct compat_timespec __user *rmtp; | |
219 | struct timespec rmt; | |
220 | mm_segment_t oldfs; | |
221 | long ret; | |
222 | ||
223 | restart->nanosleep.rmtp = (struct timespec __user *) &rmt; | |
224 | oldfs = get_fs(); | |
225 | set_fs(KERNEL_DS); | |
226 | ret = hrtimer_nanosleep_restart(restart); | |
227 | set_fs(oldfs); | |
228 | ||
229 | if (ret == -ERESTART_RESTARTBLOCK) { | |
230 | rmtp = restart->nanosleep.compat_rmtp; | |
231 | ||
232 | if (rmtp && compat_put_timespec(&rmt, rmtp)) | |
233 | return -EFAULT; | |
234 | } | |
235 | ||
236 | return ret; | |
237 | } | |
238 | ||
239 | COMPAT_SYSCALL_DEFINE2(nanosleep, struct compat_timespec __user *, rqtp, | |
240 | struct compat_timespec __user *, rmtp) | |
241 | { | |
242 | struct timespec tu, rmt; | |
243 | mm_segment_t oldfs; | |
244 | long ret; | |
245 | ||
246 | if (compat_get_timespec(&tu, rqtp)) | |
247 | return -EFAULT; | |
248 | ||
249 | if (!timespec_valid(&tu)) | |
250 | return -EINVAL; | |
251 | ||
252 | oldfs = get_fs(); | |
253 | set_fs(KERNEL_DS); | |
254 | ret = hrtimer_nanosleep(&tu, | |
255 | rmtp ? (struct timespec __user *)&rmt : NULL, | |
256 | HRTIMER_MODE_REL, CLOCK_MONOTONIC); | |
257 | set_fs(oldfs); | |
258 | ||
259 | /* | |
260 | * hrtimer_nanosleep() can only return 0 or | |
261 | * -ERESTART_RESTARTBLOCK here because: | |
262 | * | |
263 | * - we call it with HRTIMER_MODE_REL and therefor exclude the | |
264 | * -ERESTARTNOHAND return path. | |
265 | * | |
266 | * - we supply the rmtp argument from the task stack (due to | |
267 | * the necessary compat conversion. So the update cannot | |
268 | * fail, which excludes the -EFAULT return path as well. If | |
269 | * it fails nevertheless we have a bigger problem and wont | |
270 | * reach this place anymore. | |
271 | * | |
272 | * - if the return value is 0, we do not have to update rmtp | |
273 | * because there is no remaining time. | |
274 | * | |
275 | * We check for -ERESTART_RESTARTBLOCK nevertheless if the | |
276 | * core implementation decides to return random nonsense. | |
277 | */ | |
278 | if (ret == -ERESTART_RESTARTBLOCK) { | |
279 | struct restart_block *restart = ¤t->restart_block; | |
280 | ||
281 | restart->fn = compat_nanosleep_restart; | |
282 | restart->nanosleep.compat_rmtp = rmtp; | |
283 | ||
284 | if (rmtp && compat_put_timespec(&rmt, rmtp)) | |
285 | return -EFAULT; | |
286 | } | |
287 | return ret; | |
288 | } | |
289 | ||
290 | static inline long get_compat_itimerval(struct itimerval *o, | |
291 | struct compat_itimerval __user *i) | |
292 | { | |
293 | return (!access_ok(VERIFY_READ, i, sizeof(*i)) || | |
294 | (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) | | |
295 | __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) | | |
296 | __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) | | |
297 | __get_user(o->it_value.tv_usec, &i->it_value.tv_usec))); | |
298 | } | |
299 | ||
300 | static inline long put_compat_itimerval(struct compat_itimerval __user *o, | |
301 | struct itimerval *i) | |
302 | { | |
303 | return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) || | |
304 | (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) | | |
305 | __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) | | |
306 | __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) | | |
307 | __put_user(i->it_value.tv_usec, &o->it_value.tv_usec))); | |
308 | } | |
309 | ||
310 | asmlinkage long sys_ni_posix_timers(void); | |
311 | ||
312 | COMPAT_SYSCALL_DEFINE2(getitimer, int, which, | |
313 | struct compat_itimerval __user *, it) | |
314 | { | |
315 | struct itimerval kit; | |
316 | int error; | |
317 | ||
318 | if (!IS_ENABLED(CONFIG_POSIX_TIMERS)) | |
319 | return sys_ni_posix_timers(); | |
320 | ||
321 | error = do_getitimer(which, &kit); | |
322 | if (!error && put_compat_itimerval(it, &kit)) | |
323 | error = -EFAULT; | |
324 | return error; | |
325 | } | |
326 | ||
327 | COMPAT_SYSCALL_DEFINE3(setitimer, int, which, | |
328 | struct compat_itimerval __user *, in, | |
329 | struct compat_itimerval __user *, out) | |
330 | { | |
331 | struct itimerval kin, kout; | |
332 | int error; | |
333 | ||
334 | if (!IS_ENABLED(CONFIG_POSIX_TIMERS)) | |
335 | return sys_ni_posix_timers(); | |
336 | ||
337 | if (in) { | |
338 | if (get_compat_itimerval(&kin, in)) | |
339 | return -EFAULT; | |
340 | } else | |
341 | memset(&kin, 0, sizeof(kin)); | |
342 | ||
343 | error = do_setitimer(which, &kin, out ? &kout : NULL); | |
344 | if (error || !out) | |
345 | return error; | |
346 | if (put_compat_itimerval(out, &kout)) | |
347 | return -EFAULT; | |
348 | return 0; | |
349 | } | |
350 | ||
351 | static compat_clock_t clock_t_to_compat_clock_t(clock_t x) | |
352 | { | |
353 | return compat_jiffies_to_clock_t(clock_t_to_jiffies(x)); | |
354 | } | |
355 | ||
356 | COMPAT_SYSCALL_DEFINE1(times, struct compat_tms __user *, tbuf) | |
357 | { | |
358 | if (tbuf) { | |
359 | struct tms tms; | |
360 | struct compat_tms tmp; | |
361 | ||
362 | do_sys_times(&tms); | |
363 | /* Convert our struct tms to the compat version. */ | |
364 | tmp.tms_utime = clock_t_to_compat_clock_t(tms.tms_utime); | |
365 | tmp.tms_stime = clock_t_to_compat_clock_t(tms.tms_stime); | |
366 | tmp.tms_cutime = clock_t_to_compat_clock_t(tms.tms_cutime); | |
367 | tmp.tms_cstime = clock_t_to_compat_clock_t(tms.tms_cstime); | |
368 | if (copy_to_user(tbuf, &tmp, sizeof(tmp))) | |
369 | return -EFAULT; | |
370 | } | |
371 | force_successful_syscall_return(); | |
372 | return compat_jiffies_to_clock_t(jiffies); | |
373 | } | |
374 | ||
375 | #ifdef __ARCH_WANT_SYS_SIGPENDING | |
376 | ||
377 | /* | |
378 | * Assumption: old_sigset_t and compat_old_sigset_t are both | |
379 | * types that can be passed to put_user()/get_user(). | |
380 | */ | |
381 | ||
382 | COMPAT_SYSCALL_DEFINE1(sigpending, compat_old_sigset_t __user *, set) | |
383 | { | |
384 | old_sigset_t s; | |
385 | long ret; | |
386 | mm_segment_t old_fs = get_fs(); | |
387 | ||
388 | set_fs(KERNEL_DS); | |
389 | ret = sys_sigpending((old_sigset_t __user *) &s); | |
390 | set_fs(old_fs); | |
391 | if (ret == 0) | |
392 | ret = put_user(s, set); | |
393 | return ret; | |
394 | } | |
395 | ||
396 | #endif | |
397 | ||
398 | #ifdef __ARCH_WANT_SYS_SIGPROCMASK | |
399 | ||
400 | /* | |
401 | * sys_sigprocmask SIG_SETMASK sets the first (compat) word of the | |
402 | * blocked set of signals to the supplied signal set | |
403 | */ | |
404 | static inline void compat_sig_setmask(sigset_t *blocked, compat_sigset_word set) | |
405 | { | |
406 | memcpy(blocked->sig, &set, sizeof(set)); | |
407 | } | |
408 | ||
409 | COMPAT_SYSCALL_DEFINE3(sigprocmask, int, how, | |
410 | compat_old_sigset_t __user *, nset, | |
411 | compat_old_sigset_t __user *, oset) | |
412 | { | |
413 | old_sigset_t old_set, new_set; | |
414 | sigset_t new_blocked; | |
415 | ||
416 | old_set = current->blocked.sig[0]; | |
417 | ||
418 | if (nset) { | |
419 | if (get_user(new_set, nset)) | |
420 | return -EFAULT; | |
421 | new_set &= ~(sigmask(SIGKILL) | sigmask(SIGSTOP)); | |
422 | ||
423 | new_blocked = current->blocked; | |
424 | ||
425 | switch (how) { | |
426 | case SIG_BLOCK: | |
427 | sigaddsetmask(&new_blocked, new_set); | |
428 | break; | |
429 | case SIG_UNBLOCK: | |
430 | sigdelsetmask(&new_blocked, new_set); | |
431 | break; | |
432 | case SIG_SETMASK: | |
433 | compat_sig_setmask(&new_blocked, new_set); | |
434 | break; | |
435 | default: | |
436 | return -EINVAL; | |
437 | } | |
438 | ||
439 | set_current_blocked(&new_blocked); | |
440 | } | |
441 | ||
442 | if (oset) { | |
443 | if (put_user(old_set, oset)) | |
444 | return -EFAULT; | |
445 | } | |
446 | ||
447 | return 0; | |
448 | } | |
449 | ||
450 | #endif | |
451 | ||
452 | COMPAT_SYSCALL_DEFINE2(setrlimit, unsigned int, resource, | |
453 | struct compat_rlimit __user *, rlim) | |
454 | { | |
455 | struct rlimit r; | |
456 | ||
457 | if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) || | |
458 | __get_user(r.rlim_cur, &rlim->rlim_cur) || | |
459 | __get_user(r.rlim_max, &rlim->rlim_max)) | |
460 | return -EFAULT; | |
461 | ||
462 | if (r.rlim_cur == COMPAT_RLIM_INFINITY) | |
463 | r.rlim_cur = RLIM_INFINITY; | |
464 | if (r.rlim_max == COMPAT_RLIM_INFINITY) | |
465 | r.rlim_max = RLIM_INFINITY; | |
466 | return do_prlimit(current, resource, &r, NULL); | |
467 | } | |
468 | ||
469 | #ifdef COMPAT_RLIM_OLD_INFINITY | |
470 | ||
471 | COMPAT_SYSCALL_DEFINE2(old_getrlimit, unsigned int, resource, | |
472 | struct compat_rlimit __user *, rlim) | |
473 | { | |
474 | struct rlimit r; | |
475 | int ret; | |
476 | mm_segment_t old_fs = get_fs(); | |
477 | ||
478 | set_fs(KERNEL_DS); | |
479 | ret = sys_old_getrlimit(resource, (struct rlimit __user *)&r); | |
480 | set_fs(old_fs); | |
481 | ||
482 | if (!ret) { | |
483 | if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY) | |
484 | r.rlim_cur = COMPAT_RLIM_INFINITY; | |
485 | if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY) | |
486 | r.rlim_max = COMPAT_RLIM_INFINITY; | |
487 | ||
488 | if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) || | |
489 | __put_user(r.rlim_cur, &rlim->rlim_cur) || | |
490 | __put_user(r.rlim_max, &rlim->rlim_max)) | |
491 | return -EFAULT; | |
492 | } | |
493 | return ret; | |
494 | } | |
495 | ||
496 | #endif | |
497 | ||
498 | COMPAT_SYSCALL_DEFINE2(getrlimit, unsigned int, resource, | |
499 | struct compat_rlimit __user *, rlim) | |
500 | { | |
501 | struct rlimit r; | |
502 | int ret; | |
503 | ||
504 | ret = do_prlimit(current, resource, NULL, &r); | |
505 | if (!ret) { | |
506 | if (r.rlim_cur > COMPAT_RLIM_INFINITY) | |
507 | r.rlim_cur = COMPAT_RLIM_INFINITY; | |
508 | if (r.rlim_max > COMPAT_RLIM_INFINITY) | |
509 | r.rlim_max = COMPAT_RLIM_INFINITY; | |
510 | ||
511 | if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) || | |
512 | __put_user(r.rlim_cur, &rlim->rlim_cur) || | |
513 | __put_user(r.rlim_max, &rlim->rlim_max)) | |
514 | return -EFAULT; | |
515 | } | |
516 | return ret; | |
517 | } | |
518 | ||
519 | int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru) | |
520 | { | |
521 | if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) || | |
522 | __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) || | |
523 | __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) || | |
524 | __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) || | |
525 | __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) || | |
526 | __put_user(r->ru_maxrss, &ru->ru_maxrss) || | |
527 | __put_user(r->ru_ixrss, &ru->ru_ixrss) || | |
528 | __put_user(r->ru_idrss, &ru->ru_idrss) || | |
529 | __put_user(r->ru_isrss, &ru->ru_isrss) || | |
530 | __put_user(r->ru_minflt, &ru->ru_minflt) || | |
531 | __put_user(r->ru_majflt, &ru->ru_majflt) || | |
532 | __put_user(r->ru_nswap, &ru->ru_nswap) || | |
533 | __put_user(r->ru_inblock, &ru->ru_inblock) || | |
534 | __put_user(r->ru_oublock, &ru->ru_oublock) || | |
535 | __put_user(r->ru_msgsnd, &ru->ru_msgsnd) || | |
536 | __put_user(r->ru_msgrcv, &ru->ru_msgrcv) || | |
537 | __put_user(r->ru_nsignals, &ru->ru_nsignals) || | |
538 | __put_user(r->ru_nvcsw, &ru->ru_nvcsw) || | |
539 | __put_user(r->ru_nivcsw, &ru->ru_nivcsw)) | |
540 | return -EFAULT; | |
541 | return 0; | |
542 | } | |
543 | ||
544 | COMPAT_SYSCALL_DEFINE4(wait4, | |
545 | compat_pid_t, pid, | |
546 | compat_uint_t __user *, stat_addr, | |
547 | int, options, | |
548 | struct compat_rusage __user *, ru) | |
549 | { | |
550 | if (!ru) { | |
551 | return sys_wait4(pid, stat_addr, options, NULL); | |
552 | } else { | |
553 | struct rusage r; | |
554 | int ret; | |
555 | unsigned int status; | |
556 | mm_segment_t old_fs = get_fs(); | |
557 | ||
558 | set_fs (KERNEL_DS); | |
559 | ret = sys_wait4(pid, | |
560 | (stat_addr ? | |
561 | (unsigned int __user *) &status : NULL), | |
562 | options, (struct rusage __user *) &r); | |
563 | set_fs (old_fs); | |
564 | ||
565 | if (ret > 0) { | |
566 | if (put_compat_rusage(&r, ru)) | |
567 | return -EFAULT; | |
568 | if (stat_addr && put_user(status, stat_addr)) | |
569 | return -EFAULT; | |
570 | } | |
571 | return ret; | |
572 | } | |
573 | } | |
574 | ||
575 | COMPAT_SYSCALL_DEFINE5(waitid, | |
576 | int, which, compat_pid_t, pid, | |
577 | struct compat_siginfo __user *, uinfo, int, options, | |
578 | struct compat_rusage __user *, uru) | |
579 | { | |
580 | siginfo_t info; | |
581 | struct rusage ru; | |
582 | long ret; | |
583 | mm_segment_t old_fs = get_fs(); | |
584 | ||
585 | memset(&info, 0, sizeof(info)); | |
586 | ||
587 | set_fs(KERNEL_DS); | |
588 | ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options, | |
589 | uru ? (struct rusage __user *)&ru : NULL); | |
590 | set_fs(old_fs); | |
591 | ||
592 | if ((ret < 0) || (info.si_signo == 0)) | |
593 | return ret; | |
594 | ||
595 | if (uru) { | |
596 | /* sys_waitid() overwrites everything in ru */ | |
597 | if (COMPAT_USE_64BIT_TIME) | |
598 | ret = copy_to_user(uru, &ru, sizeof(ru)); | |
599 | else | |
600 | ret = put_compat_rusage(&ru, uru); | |
601 | if (ret) | |
602 | return -EFAULT; | |
603 | } | |
604 | ||
605 | BUG_ON(info.si_code & __SI_MASK); | |
606 | info.si_code |= __SI_CHLD; | |
607 | return copy_siginfo_to_user32(uinfo, &info); | |
608 | } | |
609 | ||
610 | static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr, | |
611 | unsigned len, struct cpumask *new_mask) | |
612 | { | |
613 | unsigned long *k; | |
614 | ||
615 | if (len < cpumask_size()) | |
616 | memset(new_mask, 0, cpumask_size()); | |
617 | else if (len > cpumask_size()) | |
618 | len = cpumask_size(); | |
619 | ||
620 | k = cpumask_bits(new_mask); | |
621 | return compat_get_bitmap(k, user_mask_ptr, len * 8); | |
622 | } | |
623 | ||
624 | COMPAT_SYSCALL_DEFINE3(sched_setaffinity, compat_pid_t, pid, | |
625 | unsigned int, len, | |
626 | compat_ulong_t __user *, user_mask_ptr) | |
627 | { | |
628 | cpumask_var_t new_mask; | |
629 | int retval; | |
630 | ||
631 | if (!alloc_cpumask_var(&new_mask, GFP_KERNEL)) | |
632 | return -ENOMEM; | |
633 | ||
634 | retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask); | |
635 | if (retval) | |
636 | goto out; | |
637 | ||
638 | retval = sched_setaffinity(pid, new_mask); | |
639 | out: | |
640 | free_cpumask_var(new_mask); | |
641 | return retval; | |
642 | } | |
643 | ||
644 | COMPAT_SYSCALL_DEFINE3(sched_getaffinity, compat_pid_t, pid, unsigned int, len, | |
645 | compat_ulong_t __user *, user_mask_ptr) | |
646 | { | |
647 | int ret; | |
648 | cpumask_var_t mask; | |
649 | ||
650 | if ((len * BITS_PER_BYTE) < nr_cpu_ids) | |
651 | return -EINVAL; | |
652 | if (len & (sizeof(compat_ulong_t)-1)) | |
653 | return -EINVAL; | |
654 | ||
655 | if (!alloc_cpumask_var(&mask, GFP_KERNEL)) | |
656 | return -ENOMEM; | |
657 | ||
658 | ret = sched_getaffinity(pid, mask); | |
659 | if (ret == 0) { | |
660 | size_t retlen = min_t(size_t, len, cpumask_size()); | |
661 | ||
662 | if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8)) | |
663 | ret = -EFAULT; | |
664 | else | |
665 | ret = retlen; | |
666 | } | |
667 | free_cpumask_var(mask); | |
668 | ||
669 | return ret; | |
670 | } | |
671 | ||
672 | int get_compat_itimerspec(struct itimerspec *dst, | |
673 | const struct compat_itimerspec __user *src) | |
674 | { | |
675 | if (__compat_get_timespec(&dst->it_interval, &src->it_interval) || | |
676 | __compat_get_timespec(&dst->it_value, &src->it_value)) | |
677 | return -EFAULT; | |
678 | return 0; | |
679 | } | |
680 | ||
681 | int put_compat_itimerspec(struct compat_itimerspec __user *dst, | |
682 | const struct itimerspec *src) | |
683 | { | |
684 | if (__compat_put_timespec(&src->it_interval, &dst->it_interval) || | |
685 | __compat_put_timespec(&src->it_value, &dst->it_value)) | |
686 | return -EFAULT; | |
687 | return 0; | |
688 | } | |
689 | ||
690 | COMPAT_SYSCALL_DEFINE3(timer_create, clockid_t, which_clock, | |
691 | struct compat_sigevent __user *, timer_event_spec, | |
692 | timer_t __user *, created_timer_id) | |
693 | { | |
694 | struct sigevent __user *event = NULL; | |
695 | ||
696 | if (timer_event_spec) { | |
697 | struct sigevent kevent; | |
698 | ||
699 | event = compat_alloc_user_space(sizeof(*event)); | |
700 | if (get_compat_sigevent(&kevent, timer_event_spec) || | |
701 | copy_to_user(event, &kevent, sizeof(*event))) | |
702 | return -EFAULT; | |
703 | } | |
704 | ||
705 | return sys_timer_create(which_clock, event, created_timer_id); | |
706 | } | |
707 | ||
708 | COMPAT_SYSCALL_DEFINE4(timer_settime, timer_t, timer_id, int, flags, | |
709 | struct compat_itimerspec __user *, new, | |
710 | struct compat_itimerspec __user *, old) | |
711 | { | |
712 | long err; | |
713 | mm_segment_t oldfs; | |
714 | struct itimerspec newts, oldts; | |
715 | ||
716 | if (!new) | |
717 | return -EINVAL; | |
718 | if (get_compat_itimerspec(&newts, new)) | |
719 | return -EFAULT; | |
720 | oldfs = get_fs(); | |
721 | set_fs(KERNEL_DS); | |
722 | err = sys_timer_settime(timer_id, flags, | |
723 | (struct itimerspec __user *) &newts, | |
724 | (struct itimerspec __user *) &oldts); | |
725 | set_fs(oldfs); | |
726 | if (!err && old && put_compat_itimerspec(old, &oldts)) | |
727 | return -EFAULT; | |
728 | return err; | |
729 | } | |
730 | ||
731 | COMPAT_SYSCALL_DEFINE2(timer_gettime, timer_t, timer_id, | |
732 | struct compat_itimerspec __user *, setting) | |
733 | { | |
734 | long err; | |
735 | mm_segment_t oldfs; | |
736 | struct itimerspec ts; | |
737 | ||
738 | oldfs = get_fs(); | |
739 | set_fs(KERNEL_DS); | |
740 | err = sys_timer_gettime(timer_id, | |
741 | (struct itimerspec __user *) &ts); | |
742 | set_fs(oldfs); | |
743 | if (!err && put_compat_itimerspec(setting, &ts)) | |
744 | return -EFAULT; | |
745 | return err; | |
746 | } | |
747 | ||
748 | COMPAT_SYSCALL_DEFINE2(clock_settime, clockid_t, which_clock, | |
749 | struct compat_timespec __user *, tp) | |
750 | { | |
751 | long err; | |
752 | mm_segment_t oldfs; | |
753 | struct timespec ts; | |
754 | ||
755 | if (compat_get_timespec(&ts, tp)) | |
756 | return -EFAULT; | |
757 | oldfs = get_fs(); | |
758 | set_fs(KERNEL_DS); | |
759 | err = sys_clock_settime(which_clock, | |
760 | (struct timespec __user *) &ts); | |
761 | set_fs(oldfs); | |
762 | return err; | |
763 | } | |
764 | ||
765 | COMPAT_SYSCALL_DEFINE2(clock_gettime, clockid_t, which_clock, | |
766 | struct compat_timespec __user *, tp) | |
767 | { | |
768 | long err; | |
769 | mm_segment_t oldfs; | |
770 | struct timespec ts; | |
771 | ||
772 | oldfs = get_fs(); | |
773 | set_fs(KERNEL_DS); | |
774 | err = sys_clock_gettime(which_clock, | |
775 | (struct timespec __user *) &ts); | |
776 | set_fs(oldfs); | |
777 | if (!err && compat_put_timespec(&ts, tp)) | |
778 | return -EFAULT; | |
779 | return err; | |
780 | } | |
781 | ||
782 | COMPAT_SYSCALL_DEFINE2(clock_adjtime, clockid_t, which_clock, | |
783 | struct compat_timex __user *, utp) | |
784 | { | |
785 | struct timex txc; | |
786 | mm_segment_t oldfs; | |
787 | int err, ret; | |
788 | ||
789 | err = compat_get_timex(&txc, utp); | |
790 | if (err) | |
791 | return err; | |
792 | ||
793 | oldfs = get_fs(); | |
794 | set_fs(KERNEL_DS); | |
795 | ret = sys_clock_adjtime(which_clock, (struct timex __user *) &txc); | |
796 | set_fs(oldfs); | |
797 | ||
798 | err = compat_put_timex(utp, &txc); | |
799 | if (err) | |
800 | return err; | |
801 | ||
802 | return ret; | |
803 | } | |
804 | ||
805 | COMPAT_SYSCALL_DEFINE2(clock_getres, clockid_t, which_clock, | |
806 | struct compat_timespec __user *, tp) | |
807 | { | |
808 | long err; | |
809 | mm_segment_t oldfs; | |
810 | struct timespec ts; | |
811 | ||
812 | oldfs = get_fs(); | |
813 | set_fs(KERNEL_DS); | |
814 | err = sys_clock_getres(which_clock, | |
815 | (struct timespec __user *) &ts); | |
816 | set_fs(oldfs); | |
817 | if (!err && tp && compat_put_timespec(&ts, tp)) | |
818 | return -EFAULT; | |
819 | return err; | |
820 | } | |
821 | ||
822 | static long compat_clock_nanosleep_restart(struct restart_block *restart) | |
823 | { | |
824 | long err; | |
825 | mm_segment_t oldfs; | |
826 | struct timespec tu; | |
827 | struct compat_timespec __user *rmtp = restart->nanosleep.compat_rmtp; | |
828 | ||
829 | restart->nanosleep.rmtp = (struct timespec __user *) &tu; | |
830 | oldfs = get_fs(); | |
831 | set_fs(KERNEL_DS); | |
832 | err = clock_nanosleep_restart(restart); | |
833 | set_fs(oldfs); | |
834 | ||
835 | if ((err == -ERESTART_RESTARTBLOCK) && rmtp && | |
836 | compat_put_timespec(&tu, rmtp)) | |
837 | return -EFAULT; | |
838 | ||
839 | if (err == -ERESTART_RESTARTBLOCK) { | |
840 | restart->fn = compat_clock_nanosleep_restart; | |
841 | restart->nanosleep.compat_rmtp = rmtp; | |
842 | } | |
843 | return err; | |
844 | } | |
845 | ||
846 | COMPAT_SYSCALL_DEFINE4(clock_nanosleep, clockid_t, which_clock, int, flags, | |
847 | struct compat_timespec __user *, rqtp, | |
848 | struct compat_timespec __user *, rmtp) | |
849 | { | |
850 | long err; | |
851 | mm_segment_t oldfs; | |
852 | struct timespec in, out; | |
853 | struct restart_block *restart; | |
854 | ||
855 | if (compat_get_timespec(&in, rqtp)) | |
856 | return -EFAULT; | |
857 | ||
858 | oldfs = get_fs(); | |
859 | set_fs(KERNEL_DS); | |
860 | err = sys_clock_nanosleep(which_clock, flags, | |
861 | (struct timespec __user *) &in, | |
862 | (struct timespec __user *) &out); | |
863 | set_fs(oldfs); | |
864 | ||
865 | if ((err == -ERESTART_RESTARTBLOCK) && rmtp && | |
866 | compat_put_timespec(&out, rmtp)) | |
867 | return -EFAULT; | |
868 | ||
869 | if (err == -ERESTART_RESTARTBLOCK) { | |
870 | restart = ¤t->restart_block; | |
871 | restart->fn = compat_clock_nanosleep_restart; | |
872 | restart->nanosleep.compat_rmtp = rmtp; | |
873 | } | |
874 | return err; | |
875 | } | |
876 | ||
877 | /* | |
878 | * We currently only need the following fields from the sigevent | |
879 | * structure: sigev_value, sigev_signo, sig_notify and (sometimes | |
880 | * sigev_notify_thread_id). The others are handled in user mode. | |
881 | * We also assume that copying sigev_value.sival_int is sufficient | |
882 | * to keep all the bits of sigev_value.sival_ptr intact. | |
883 | */ | |
884 | int get_compat_sigevent(struct sigevent *event, | |
885 | const struct compat_sigevent __user *u_event) | |
886 | { | |
887 | memset(event, 0, sizeof(*event)); | |
888 | return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) || | |
889 | __get_user(event->sigev_value.sival_int, | |
890 | &u_event->sigev_value.sival_int) || | |
891 | __get_user(event->sigev_signo, &u_event->sigev_signo) || | |
892 | __get_user(event->sigev_notify, &u_event->sigev_notify) || | |
893 | __get_user(event->sigev_notify_thread_id, | |
894 | &u_event->sigev_notify_thread_id)) | |
895 | ? -EFAULT : 0; | |
896 | } | |
897 | ||
898 | long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask, | |
899 | unsigned long bitmap_size) | |
900 | { | |
901 | int i, j; | |
902 | unsigned long m; | |
903 | compat_ulong_t um; | |
904 | unsigned long nr_compat_longs; | |
905 | ||
906 | /* align bitmap up to nearest compat_long_t boundary */ | |
907 | bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); | |
908 | ||
909 | if (!access_ok(VERIFY_READ, umask, bitmap_size / 8)) | |
910 | return -EFAULT; | |
911 | ||
912 | nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); | |
913 | ||
914 | for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) { | |
915 | m = 0; | |
916 | ||
917 | for (j = 0; j < sizeof(m)/sizeof(um); j++) { | |
918 | /* | |
919 | * We dont want to read past the end of the userspace | |
920 | * bitmap. We must however ensure the end of the | |
921 | * kernel bitmap is zeroed. | |
922 | */ | |
923 | if (nr_compat_longs) { | |
924 | nr_compat_longs--; | |
925 | if (__get_user(um, umask)) | |
926 | return -EFAULT; | |
927 | } else { | |
928 | um = 0; | |
929 | } | |
930 | ||
931 | umask++; | |
932 | m |= (long)um << (j * BITS_PER_COMPAT_LONG); | |
933 | } | |
934 | *mask++ = m; | |
935 | } | |
936 | ||
937 | return 0; | |
938 | } | |
939 | ||
940 | long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask, | |
941 | unsigned long bitmap_size) | |
942 | { | |
943 | int i, j; | |
944 | unsigned long m; | |
945 | compat_ulong_t um; | |
946 | unsigned long nr_compat_longs; | |
947 | ||
948 | /* align bitmap up to nearest compat_long_t boundary */ | |
949 | bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); | |
950 | ||
951 | if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8)) | |
952 | return -EFAULT; | |
953 | ||
954 | nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); | |
955 | ||
956 | for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) { | |
957 | m = *mask++; | |
958 | ||
959 | for (j = 0; j < sizeof(m)/sizeof(um); j++) { | |
960 | um = m; | |
961 | ||
962 | /* | |
963 | * We dont want to write past the end of the userspace | |
964 | * bitmap. | |
965 | */ | |
966 | if (nr_compat_longs) { | |
967 | nr_compat_longs--; | |
968 | if (__put_user(um, umask)) | |
969 | return -EFAULT; | |
970 | } | |
971 | ||
972 | umask++; | |
973 | m >>= 4*sizeof(um); | |
974 | m >>= 4*sizeof(um); | |
975 | } | |
976 | } | |
977 | ||
978 | return 0; | |
979 | } | |
980 | ||
981 | void | |
982 | sigset_from_compat(sigset_t *set, const compat_sigset_t *compat) | |
983 | { | |
984 | switch (_NSIG_WORDS) { | |
985 | case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 ); | |
986 | case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 ); | |
987 | case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 ); | |
988 | case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 ); | |
989 | } | |
990 | } | |
991 | EXPORT_SYMBOL_GPL(sigset_from_compat); | |
992 | ||
993 | void | |
994 | sigset_to_compat(compat_sigset_t *compat, const sigset_t *set) | |
995 | { | |
996 | switch (_NSIG_WORDS) { | |
997 | case 4: compat->sig[7] = (set->sig[3] >> 32); compat->sig[6] = set->sig[3]; | |
998 | case 3: compat->sig[5] = (set->sig[2] >> 32); compat->sig[4] = set->sig[2]; | |
999 | case 2: compat->sig[3] = (set->sig[1] >> 32); compat->sig[2] = set->sig[1]; | |
1000 | case 1: compat->sig[1] = (set->sig[0] >> 32); compat->sig[0] = set->sig[0]; | |
1001 | } | |
1002 | } | |
1003 | ||
1004 | COMPAT_SYSCALL_DEFINE4(rt_sigtimedwait, compat_sigset_t __user *, uthese, | |
1005 | struct compat_siginfo __user *, uinfo, | |
1006 | struct compat_timespec __user *, uts, compat_size_t, sigsetsize) | |
1007 | { | |
1008 | compat_sigset_t s32; | |
1009 | sigset_t s; | |
1010 | struct timespec t; | |
1011 | siginfo_t info; | |
1012 | long ret; | |
1013 | ||
1014 | if (sigsetsize != sizeof(sigset_t)) | |
1015 | return -EINVAL; | |
1016 | ||
1017 | if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t))) | |
1018 | return -EFAULT; | |
1019 | sigset_from_compat(&s, &s32); | |
1020 | ||
1021 | if (uts) { | |
1022 | if (compat_get_timespec(&t, uts)) | |
1023 | return -EFAULT; | |
1024 | } | |
1025 | ||
1026 | ret = do_sigtimedwait(&s, &info, uts ? &t : NULL); | |
1027 | ||
1028 | if (ret > 0 && uinfo) { | |
1029 | if (copy_siginfo_to_user32(uinfo, &info)) | |
1030 | ret = -EFAULT; | |
1031 | } | |
1032 | ||
1033 | return ret; | |
1034 | } | |
1035 | ||
1036 | #ifdef __ARCH_WANT_COMPAT_SYS_TIME | |
1037 | ||
1038 | /* compat_time_t is a 32 bit "long" and needs to get converted. */ | |
1039 | ||
1040 | COMPAT_SYSCALL_DEFINE1(time, compat_time_t __user *, tloc) | |
1041 | { | |
1042 | compat_time_t i; | |
1043 | struct timeval tv; | |
1044 | ||
1045 | do_gettimeofday(&tv); | |
1046 | i = tv.tv_sec; | |
1047 | ||
1048 | if (tloc) { | |
1049 | if (put_user(i,tloc)) | |
1050 | return -EFAULT; | |
1051 | } | |
1052 | force_successful_syscall_return(); | |
1053 | return i; | |
1054 | } | |
1055 | ||
1056 | COMPAT_SYSCALL_DEFINE1(stime, compat_time_t __user *, tptr) | |
1057 | { | |
1058 | struct timespec tv; | |
1059 | int err; | |
1060 | ||
1061 | if (get_user(tv.tv_sec, tptr)) | |
1062 | return -EFAULT; | |
1063 | ||
1064 | tv.tv_nsec = 0; | |
1065 | ||
1066 | err = security_settime(&tv, NULL); | |
1067 | if (err) | |
1068 | return err; | |
1069 | ||
1070 | do_settimeofday(&tv); | |
1071 | return 0; | |
1072 | } | |
1073 | ||
1074 | #endif /* __ARCH_WANT_COMPAT_SYS_TIME */ | |
1075 | ||
1076 | COMPAT_SYSCALL_DEFINE1(adjtimex, struct compat_timex __user *, utp) | |
1077 | { | |
1078 | struct timex txc; | |
1079 | int err, ret; | |
1080 | ||
1081 | err = compat_get_timex(&txc, utp); | |
1082 | if (err) | |
1083 | return err; | |
1084 | ||
1085 | ret = do_adjtimex(&txc); | |
1086 | ||
1087 | err = compat_put_timex(utp, &txc); | |
1088 | if (err) | |
1089 | return err; | |
1090 | ||
1091 | return ret; | |
1092 | } | |
1093 | ||
1094 | #ifdef CONFIG_NUMA | |
1095 | COMPAT_SYSCALL_DEFINE6(move_pages, pid_t, pid, compat_ulong_t, nr_pages, | |
1096 | compat_uptr_t __user *, pages32, | |
1097 | const int __user *, nodes, | |
1098 | int __user *, status, | |
1099 | int, flags) | |
1100 | { | |
1101 | const void __user * __user *pages; | |
1102 | int i; | |
1103 | ||
1104 | pages = compat_alloc_user_space(nr_pages * sizeof(void *)); | |
1105 | for (i = 0; i < nr_pages; i++) { | |
1106 | compat_uptr_t p; | |
1107 | ||
1108 | if (get_user(p, pages32 + i) || | |
1109 | put_user(compat_ptr(p), pages + i)) | |
1110 | return -EFAULT; | |
1111 | } | |
1112 | return sys_move_pages(pid, nr_pages, pages, nodes, status, flags); | |
1113 | } | |
1114 | ||
1115 | COMPAT_SYSCALL_DEFINE4(migrate_pages, compat_pid_t, pid, | |
1116 | compat_ulong_t, maxnode, | |
1117 | const compat_ulong_t __user *, old_nodes, | |
1118 | const compat_ulong_t __user *, new_nodes) | |
1119 | { | |
1120 | unsigned long __user *old = NULL; | |
1121 | unsigned long __user *new = NULL; | |
1122 | nodemask_t tmp_mask; | |
1123 | unsigned long nr_bits; | |
1124 | unsigned long size; | |
1125 | ||
1126 | nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES); | |
1127 | size = ALIGN(nr_bits, BITS_PER_LONG) / 8; | |
1128 | if (old_nodes) { | |
1129 | if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits)) | |
1130 | return -EFAULT; | |
1131 | old = compat_alloc_user_space(new_nodes ? size * 2 : size); | |
1132 | if (new_nodes) | |
1133 | new = old + size / sizeof(unsigned long); | |
1134 | if (copy_to_user(old, nodes_addr(tmp_mask), size)) | |
1135 | return -EFAULT; | |
1136 | } | |
1137 | if (new_nodes) { | |
1138 | if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits)) | |
1139 | return -EFAULT; | |
1140 | if (new == NULL) | |
1141 | new = compat_alloc_user_space(size); | |
1142 | if (copy_to_user(new, nodes_addr(tmp_mask), size)) | |
1143 | return -EFAULT; | |
1144 | } | |
1145 | return sys_migrate_pages(pid, nr_bits + 1, old, new); | |
1146 | } | |
1147 | #endif | |
1148 | ||
1149 | COMPAT_SYSCALL_DEFINE2(sched_rr_get_interval, | |
1150 | compat_pid_t, pid, | |
1151 | struct compat_timespec __user *, interval) | |
1152 | { | |
1153 | struct timespec t; | |
1154 | int ret; | |
1155 | mm_segment_t old_fs = get_fs(); | |
1156 | ||
1157 | set_fs(KERNEL_DS); | |
1158 | ret = sys_sched_rr_get_interval(pid, (struct timespec __user *)&t); | |
1159 | set_fs(old_fs); | |
1160 | if (compat_put_timespec(&t, interval)) | |
1161 | return -EFAULT; | |
1162 | return ret; | |
1163 | } | |
1164 | ||
1165 | /* | |
1166 | * Allocate user-space memory for the duration of a single system call, | |
1167 | * in order to marshall parameters inside a compat thunk. | |
1168 | */ | |
1169 | void __user *compat_alloc_user_space(unsigned long len) | |
1170 | { | |
1171 | void __user *ptr; | |
1172 | ||
1173 | /* If len would occupy more than half of the entire compat space... */ | |
1174 | if (unlikely(len > (((compat_uptr_t)~0) >> 1))) | |
1175 | return NULL; | |
1176 | ||
1177 | ptr = arch_compat_alloc_user_space(len); | |
1178 | ||
1179 | if (unlikely(!access_ok(VERIFY_WRITE, ptr, len))) | |
1180 | return NULL; | |
1181 | ||
1182 | return ptr; | |
1183 | } | |
1184 | EXPORT_SYMBOL_GPL(compat_alloc_user_space); |