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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 <asm/uaccess.h> |
32 | |
33 | /* |
34 | * Get/set struct timeval with struct timespec on the native side |
35 | */ |
36 | static int compat_get_timeval_convert(struct timespec *o, |
37 | struct compat_timeval __user *i) |
38 | { |
39 | long usec; |
40 | |
41 | if (get_user(o->tv_sec, &i->tv_sec) || |
42 | get_user(usec, &i->tv_usec)) |
43 | return -EFAULT; |
44 | o->tv_nsec = usec * 1000; |
45 | return 0; |
46 | } |
47 | |
48 | static int compat_put_timeval_convert(struct compat_timeval __user *o, |
49 | struct timeval *i) |
50 | { |
51 | return (put_user(i->tv_sec, &o->tv_sec) || |
52 | put_user(i->tv_usec, &o->tv_usec)) ? -EFAULT : 0; |
53 | } |
54 | |
55 | static int compat_get_timex(struct timex *txc, struct compat_timex __user *utp) |
56 | { |
57 | memset(txc, 0, sizeof(struct timex)); |
58 | |
59 | if (!access_ok(VERIFY_READ, utp, sizeof(struct compat_timex)) || |
60 | __get_user(txc->modes, &utp->modes) || |
61 | __get_user(txc->offset, &utp->offset) || |
62 | __get_user(txc->freq, &utp->freq) || |
63 | __get_user(txc->maxerror, &utp->maxerror) || |
64 | __get_user(txc->esterror, &utp->esterror) || |
65 | __get_user(txc->status, &utp->status) || |
66 | __get_user(txc->constant, &utp->constant) || |
67 | __get_user(txc->precision, &utp->precision) || |
68 | __get_user(txc->tolerance, &utp->tolerance) || |
69 | __get_user(txc->time.tv_sec, &utp->time.tv_sec) || |
70 | __get_user(txc->time.tv_usec, &utp->time.tv_usec) || |
71 | __get_user(txc->tick, &utp->tick) || |
72 | __get_user(txc->ppsfreq, &utp->ppsfreq) || |
73 | __get_user(txc->jitter, &utp->jitter) || |
74 | __get_user(txc->shift, &utp->shift) || |
75 | __get_user(txc->stabil, &utp->stabil) || |
76 | __get_user(txc->jitcnt, &utp->jitcnt) || |
77 | __get_user(txc->calcnt, &utp->calcnt) || |
78 | __get_user(txc->errcnt, &utp->errcnt) || |
79 | __get_user(txc->stbcnt, &utp->stbcnt)) |
80 | return -EFAULT; |
81 | |
82 | return 0; |
83 | } |
84 | |
85 | static int compat_put_timex(struct compat_timex __user *utp, struct timex *txc) |
86 | { |
87 | if (!access_ok(VERIFY_WRITE, utp, sizeof(struct compat_timex)) || |
88 | __put_user(txc->modes, &utp->modes) || |
89 | __put_user(txc->offset, &utp->offset) || |
90 | __put_user(txc->freq, &utp->freq) || |
91 | __put_user(txc->maxerror, &utp->maxerror) || |
92 | __put_user(txc->esterror, &utp->esterror) || |
93 | __put_user(txc->status, &utp->status) || |
94 | __put_user(txc->constant, &utp->constant) || |
95 | __put_user(txc->precision, &utp->precision) || |
96 | __put_user(txc->tolerance, &utp->tolerance) || |
97 | __put_user(txc->time.tv_sec, &utp->time.tv_sec) || |
98 | __put_user(txc->time.tv_usec, &utp->time.tv_usec) || |
99 | __put_user(txc->tick, &utp->tick) || |
100 | __put_user(txc->ppsfreq, &utp->ppsfreq) || |
101 | __put_user(txc->jitter, &utp->jitter) || |
102 | __put_user(txc->shift, &utp->shift) || |
103 | __put_user(txc->stabil, &utp->stabil) || |
104 | __put_user(txc->jitcnt, &utp->jitcnt) || |
105 | __put_user(txc->calcnt, &utp->calcnt) || |
106 | __put_user(txc->errcnt, &utp->errcnt) || |
107 | __put_user(txc->stbcnt, &utp->stbcnt) || |
108 | __put_user(txc->tai, &utp->tai)) |
109 | return -EFAULT; |
110 | return 0; |
111 | } |
112 | |
113 | asmlinkage long compat_sys_gettimeofday(struct compat_timeval __user *tv, |
114 | struct timezone __user *tz) |
115 | { |
116 | if (tv) { |
117 | struct timeval ktv; |
118 | do_gettimeofday(&ktv); |
119 | if (compat_put_timeval_convert(tv, &ktv)) |
120 | return -EFAULT; |
121 | } |
122 | if (tz) { |
123 | if (copy_to_user(tz, &sys_tz, sizeof(sys_tz))) |
124 | return -EFAULT; |
125 | } |
126 | |
127 | return 0; |
128 | } |
129 | |
130 | asmlinkage long compat_sys_settimeofday(struct compat_timeval __user *tv, |
131 | struct timezone __user *tz) |
132 | { |
133 | struct timespec kts; |
134 | struct timezone ktz; |
135 | |
136 | if (tv) { |
137 | if (compat_get_timeval_convert(&kts, tv)) |
138 | return -EFAULT; |
139 | } |
140 | if (tz) { |
141 | if (copy_from_user(&ktz, tz, sizeof(ktz))) |
142 | return -EFAULT; |
143 | } |
144 | |
145 | return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL); |
146 | } |
147 | |
148 | int get_compat_timeval(struct timeval *tv, const struct compat_timeval __user *ctv) |
149 | { |
150 | return (!access_ok(VERIFY_READ, ctv, sizeof(*ctv)) || |
151 | __get_user(tv->tv_sec, &ctv->tv_sec) || |
152 | __get_user(tv->tv_usec, &ctv->tv_usec)) ? -EFAULT : 0; |
153 | } |
154 | EXPORT_SYMBOL_GPL(get_compat_timeval); |
155 | |
156 | int put_compat_timeval(const struct timeval *tv, struct compat_timeval __user *ctv) |
157 | { |
158 | return (!access_ok(VERIFY_WRITE, ctv, sizeof(*ctv)) || |
159 | __put_user(tv->tv_sec, &ctv->tv_sec) || |
160 | __put_user(tv->tv_usec, &ctv->tv_usec)) ? -EFAULT : 0; |
161 | } |
162 | EXPORT_SYMBOL_GPL(put_compat_timeval); |
163 | |
164 | int get_compat_timespec(struct timespec *ts, const struct compat_timespec __user *cts) |
165 | { |
166 | return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) || |
167 | __get_user(ts->tv_sec, &cts->tv_sec) || |
168 | __get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0; |
169 | } |
170 | EXPORT_SYMBOL_GPL(get_compat_timespec); |
171 | |
172 | int put_compat_timespec(const struct timespec *ts, struct compat_timespec __user *cts) |
173 | { |
174 | return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) || |
175 | __put_user(ts->tv_sec, &cts->tv_sec) || |
176 | __put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0; |
177 | } |
178 | EXPORT_SYMBOL_GPL(put_compat_timespec); |
179 | |
180 | int compat_get_timeval(struct timeval *tv, const void __user *utv) |
181 | { |
182 | if (COMPAT_USE_64BIT_TIME) |
183 | return copy_from_user(tv, utv, sizeof *tv) ? -EFAULT : 0; |
184 | else |
185 | return get_compat_timeval(tv, utv); |
186 | } |
187 | EXPORT_SYMBOL_GPL(compat_get_timeval); |
188 | |
189 | int compat_put_timeval(const struct timeval *tv, void __user *utv) |
190 | { |
191 | if (COMPAT_USE_64BIT_TIME) |
192 | return copy_to_user(utv, tv, sizeof *tv) ? -EFAULT : 0; |
193 | else |
194 | return put_compat_timeval(tv, utv); |
195 | } |
196 | EXPORT_SYMBOL_GPL(compat_put_timeval); |
197 | |
198 | int compat_get_timespec(struct timespec *ts, const void __user *uts) |
199 | { |
200 | if (COMPAT_USE_64BIT_TIME) |
201 | return copy_from_user(ts, uts, sizeof *ts) ? -EFAULT : 0; |
202 | else |
203 | return get_compat_timespec(ts, uts); |
204 | } |
205 | EXPORT_SYMBOL_GPL(compat_get_timespec); |
206 | |
207 | int compat_put_timespec(const struct timespec *ts, void __user *uts) |
208 | { |
209 | if (COMPAT_USE_64BIT_TIME) |
210 | return copy_to_user(uts, ts, sizeof *ts) ? -EFAULT : 0; |
211 | else |
212 | return put_compat_timespec(ts, uts); |
213 | } |
214 | EXPORT_SYMBOL_GPL(compat_put_timespec); |
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) { |
230 | rmtp = restart->nanosleep.compat_rmtp; |
231 | |
232 | if (rmtp && put_compat_timespec(&rmt, rmtp)) |
233 | return -EFAULT; |
234 | } |
235 | |
236 | return ret; |
237 | } |
238 | |
239 | asmlinkage long compat_sys_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 (get_compat_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 | if (ret) { |
260 | struct restart_block *restart |
261 | = ¤t_thread_info()->restart_block; |
262 | |
263 | restart->fn = compat_nanosleep_restart; |
264 | restart->nanosleep.compat_rmtp = rmtp; |
265 | |
266 | if (rmtp && put_compat_timespec(&rmt, rmtp)) |
267 | return -EFAULT; |
268 | } |
269 | |
270 | return ret; |
271 | } |
272 | |
273 | static inline long get_compat_itimerval(struct itimerval *o, |
274 | struct compat_itimerval __user *i) |
275 | { |
276 | return (!access_ok(VERIFY_READ, i, sizeof(*i)) || |
277 | (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) | |
278 | __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) | |
279 | __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) | |
280 | __get_user(o->it_value.tv_usec, &i->it_value.tv_usec))); |
281 | } |
282 | |
283 | static inline long put_compat_itimerval(struct compat_itimerval __user *o, |
284 | struct itimerval *i) |
285 | { |
286 | return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) || |
287 | (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) | |
288 | __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) | |
289 | __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) | |
290 | __put_user(i->it_value.tv_usec, &o->it_value.tv_usec))); |
291 | } |
292 | |
293 | COMPAT_SYSCALL_DEFINE2(getitimer, int, which, |
294 | struct compat_itimerval __user *, it) |
295 | { |
296 | struct itimerval kit; |
297 | int error; |
298 | |
299 | error = do_getitimer(which, &kit); |
300 | if (!error && put_compat_itimerval(it, &kit)) |
301 | error = -EFAULT; |
302 | return error; |
303 | } |
304 | |
305 | COMPAT_SYSCALL_DEFINE3(setitimer, int, which, |
306 | struct compat_itimerval __user *, in, |
307 | struct compat_itimerval __user *, out) |
308 | { |
309 | struct itimerval kin, kout; |
310 | int error; |
311 | |
312 | if (in) { |
313 | if (get_compat_itimerval(&kin, in)) |
314 | return -EFAULT; |
315 | } else |
316 | memset(&kin, 0, sizeof(kin)); |
317 | |
318 | error = do_setitimer(which, &kin, out ? &kout : NULL); |
319 | if (error || !out) |
320 | return error; |
321 | if (put_compat_itimerval(out, &kout)) |
322 | return -EFAULT; |
323 | return 0; |
324 | } |
325 | |
326 | static compat_clock_t clock_t_to_compat_clock_t(clock_t x) |
327 | { |
328 | return compat_jiffies_to_clock_t(clock_t_to_jiffies(x)); |
329 | } |
330 | |
331 | asmlinkage long compat_sys_times(struct compat_tms __user *tbuf) |
332 | { |
333 | if (tbuf) { |
334 | struct tms tms; |
335 | struct compat_tms tmp; |
336 | |
337 | do_sys_times(&tms); |
338 | /* Convert our struct tms to the compat version. */ |
339 | tmp.tms_utime = clock_t_to_compat_clock_t(tms.tms_utime); |
340 | tmp.tms_stime = clock_t_to_compat_clock_t(tms.tms_stime); |
341 | tmp.tms_cutime = clock_t_to_compat_clock_t(tms.tms_cutime); |
342 | tmp.tms_cstime = clock_t_to_compat_clock_t(tms.tms_cstime); |
343 | if (copy_to_user(tbuf, &tmp, sizeof(tmp))) |
344 | return -EFAULT; |
345 | } |
346 | force_successful_syscall_return(); |
347 | return compat_jiffies_to_clock_t(jiffies); |
348 | } |
349 | |
350 | #ifdef __ARCH_WANT_SYS_SIGPENDING |
351 | |
352 | /* |
353 | * Assumption: old_sigset_t and compat_old_sigset_t are both |
354 | * types that can be passed to put_user()/get_user(). |
355 | */ |
356 | |
357 | asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set) |
358 | { |
359 | old_sigset_t s; |
360 | long ret; |
361 | mm_segment_t old_fs = get_fs(); |
362 | |
363 | set_fs(KERNEL_DS); |
364 | ret = sys_sigpending((old_sigset_t __user *) &s); |
365 | set_fs(old_fs); |
366 | if (ret == 0) |
367 | ret = put_user(s, set); |
368 | return ret; |
369 | } |
370 | |
371 | #endif |
372 | |
373 | #ifdef __ARCH_WANT_SYS_SIGPROCMASK |
374 | |
375 | /* |
376 | * sys_sigprocmask SIG_SETMASK sets the first (compat) word of the |
377 | * blocked set of signals to the supplied signal set |
378 | */ |
379 | static inline void compat_sig_setmask(sigset_t *blocked, compat_sigset_word set) |
380 | { |
381 | memcpy(blocked->sig, &set, sizeof(set)); |
382 | } |
383 | |
384 | COMPAT_SYSCALL_DEFINE3(sigprocmask, int, how, |
385 | compat_old_sigset_t __user *, nset, |
386 | compat_old_sigset_t __user *, oset) |
387 | { |
388 | old_sigset_t old_set, new_set; |
389 | sigset_t new_blocked; |
390 | |
391 | old_set = current->blocked.sig[0]; |
392 | |
393 | if (nset) { |
394 | if (get_user(new_set, nset)) |
395 | return -EFAULT; |
396 | new_set &= ~(sigmask(SIGKILL) | sigmask(SIGSTOP)); |
397 | |
398 | new_blocked = current->blocked; |
399 | |
400 | switch (how) { |
401 | case SIG_BLOCK: |
402 | sigaddsetmask(&new_blocked, new_set); |
403 | break; |
404 | case SIG_UNBLOCK: |
405 | sigdelsetmask(&new_blocked, new_set); |
406 | break; |
407 | case SIG_SETMASK: |
408 | compat_sig_setmask(&new_blocked, new_set); |
409 | break; |
410 | default: |
411 | return -EINVAL; |
412 | } |
413 | |
414 | set_current_blocked(&new_blocked); |
415 | } |
416 | |
417 | if (oset) { |
418 | if (put_user(old_set, oset)) |
419 | return -EFAULT; |
420 | } |
421 | |
422 | return 0; |
423 | } |
424 | |
425 | #endif |
426 | |
427 | asmlinkage long compat_sys_setrlimit(unsigned int resource, |
428 | struct compat_rlimit __user *rlim) |
429 | { |
430 | struct rlimit r; |
431 | |
432 | if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) || |
433 | __get_user(r.rlim_cur, &rlim->rlim_cur) || |
434 | __get_user(r.rlim_max, &rlim->rlim_max)) |
435 | return -EFAULT; |
436 | |
437 | if (r.rlim_cur == COMPAT_RLIM_INFINITY) |
438 | r.rlim_cur = RLIM_INFINITY; |
439 | if (r.rlim_max == COMPAT_RLIM_INFINITY) |
440 | r.rlim_max = RLIM_INFINITY; |
441 | return do_prlimit(current, resource, &r, NULL); |
442 | } |
443 | |
444 | #ifdef COMPAT_RLIM_OLD_INFINITY |
445 | |
446 | asmlinkage long compat_sys_old_getrlimit(unsigned int resource, |
447 | struct compat_rlimit __user *rlim) |
448 | { |
449 | struct rlimit r; |
450 | int ret; |
451 | mm_segment_t old_fs = get_fs(); |
452 | |
453 | set_fs(KERNEL_DS); |
454 | ret = sys_old_getrlimit(resource, &r); |
455 | set_fs(old_fs); |
456 | |
457 | if (!ret) { |
458 | if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY) |
459 | r.rlim_cur = COMPAT_RLIM_INFINITY; |
460 | if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY) |
461 | r.rlim_max = COMPAT_RLIM_INFINITY; |
462 | |
463 | if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) || |
464 | __put_user(r.rlim_cur, &rlim->rlim_cur) || |
465 | __put_user(r.rlim_max, &rlim->rlim_max)) |
466 | return -EFAULT; |
467 | } |
468 | return ret; |
469 | } |
470 | |
471 | #endif |
472 | |
473 | asmlinkage long compat_sys_getrlimit(unsigned int resource, |
474 | struct compat_rlimit __user *rlim) |
475 | { |
476 | struct rlimit r; |
477 | int ret; |
478 | |
479 | ret = do_prlimit(current, resource, NULL, &r); |
480 | if (!ret) { |
481 | if (r.rlim_cur > COMPAT_RLIM_INFINITY) |
482 | r.rlim_cur = COMPAT_RLIM_INFINITY; |
483 | if (r.rlim_max > COMPAT_RLIM_INFINITY) |
484 | r.rlim_max = COMPAT_RLIM_INFINITY; |
485 | |
486 | if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) || |
487 | __put_user(r.rlim_cur, &rlim->rlim_cur) || |
488 | __put_user(r.rlim_max, &rlim->rlim_max)) |
489 | return -EFAULT; |
490 | } |
491 | return ret; |
492 | } |
493 | |
494 | int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru) |
495 | { |
496 | if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) || |
497 | __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) || |
498 | __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) || |
499 | __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) || |
500 | __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) || |
501 | __put_user(r->ru_maxrss, &ru->ru_maxrss) || |
502 | __put_user(r->ru_ixrss, &ru->ru_ixrss) || |
503 | __put_user(r->ru_idrss, &ru->ru_idrss) || |
504 | __put_user(r->ru_isrss, &ru->ru_isrss) || |
505 | __put_user(r->ru_minflt, &ru->ru_minflt) || |
506 | __put_user(r->ru_majflt, &ru->ru_majflt) || |
507 | __put_user(r->ru_nswap, &ru->ru_nswap) || |
508 | __put_user(r->ru_inblock, &ru->ru_inblock) || |
509 | __put_user(r->ru_oublock, &ru->ru_oublock) || |
510 | __put_user(r->ru_msgsnd, &ru->ru_msgsnd) || |
511 | __put_user(r->ru_msgrcv, &ru->ru_msgrcv) || |
512 | __put_user(r->ru_nsignals, &ru->ru_nsignals) || |
513 | __put_user(r->ru_nvcsw, &ru->ru_nvcsw) || |
514 | __put_user(r->ru_nivcsw, &ru->ru_nivcsw)) |
515 | return -EFAULT; |
516 | return 0; |
517 | } |
518 | |
519 | COMPAT_SYSCALL_DEFINE4(wait4, |
520 | compat_pid_t, pid, |
521 | compat_uint_t __user *, stat_addr, |
522 | int, options, |
523 | struct compat_rusage __user *, ru) |
524 | { |
525 | if (!ru) { |
526 | return sys_wait4(pid, stat_addr, options, NULL); |
527 | } else { |
528 | struct rusage r; |
529 | int ret; |
530 | unsigned int status; |
531 | mm_segment_t old_fs = get_fs(); |
532 | |
533 | set_fs (KERNEL_DS); |
534 | ret = sys_wait4(pid, |
535 | (stat_addr ? |
536 | (unsigned int __user *) &status : NULL), |
537 | options, (struct rusage __user *) &r); |
538 | set_fs (old_fs); |
539 | |
540 | if (ret > 0) { |
541 | if (put_compat_rusage(&r, ru)) |
542 | return -EFAULT; |
543 | if (stat_addr && put_user(status, stat_addr)) |
544 | return -EFAULT; |
545 | } |
546 | return ret; |
547 | } |
548 | } |
549 | |
550 | COMPAT_SYSCALL_DEFINE5(waitid, |
551 | int, which, compat_pid_t, pid, |
552 | struct compat_siginfo __user *, uinfo, int, options, |
553 | struct compat_rusage __user *, uru) |
554 | { |
555 | siginfo_t info; |
556 | struct rusage ru; |
557 | long ret; |
558 | mm_segment_t old_fs = get_fs(); |
559 | |
560 | memset(&info, 0, sizeof(info)); |
561 | |
562 | set_fs(KERNEL_DS); |
563 | ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options, |
564 | uru ? (struct rusage __user *)&ru : NULL); |
565 | set_fs(old_fs); |
566 | |
567 | if ((ret < 0) || (info.si_signo == 0)) |
568 | return ret; |
569 | |
570 | if (uru) { |
571 | /* sys_waitid() overwrites everything in ru */ |
572 | if (COMPAT_USE_64BIT_TIME) |
573 | ret = copy_to_user(uru, &ru, sizeof(ru)); |
574 | else |
575 | ret = put_compat_rusage(&ru, uru); |
576 | if (ret) |
577 | return -EFAULT; |
578 | } |
579 | |
580 | BUG_ON(info.si_code & __SI_MASK); |
581 | info.si_code |= __SI_CHLD; |
582 | return copy_siginfo_to_user32(uinfo, &info); |
583 | } |
584 | |
585 | static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr, |
586 | unsigned len, struct cpumask *new_mask) |
587 | { |
588 | unsigned long *k; |
589 | |
590 | if (len < cpumask_size()) |
591 | memset(new_mask, 0, cpumask_size()); |
592 | else if (len > cpumask_size()) |
593 | len = cpumask_size(); |
594 | |
595 | k = cpumask_bits(new_mask); |
596 | return compat_get_bitmap(k, user_mask_ptr, len * 8); |
597 | } |
598 | |
599 | asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid, |
600 | unsigned int len, |
601 | compat_ulong_t __user *user_mask_ptr) |
602 | { |
603 | cpumask_var_t new_mask; |
604 | int retval; |
605 | |
606 | if (!alloc_cpumask_var(&new_mask, GFP_KERNEL)) |
607 | return -ENOMEM; |
608 | |
609 | retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask); |
610 | if (retval) |
611 | goto out; |
612 | |
613 | retval = sched_setaffinity(pid, new_mask); |
614 | out: |
615 | free_cpumask_var(new_mask); |
616 | return retval; |
617 | } |
618 | |
619 | asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len, |
620 | compat_ulong_t __user *user_mask_ptr) |
621 | { |
622 | int ret; |
623 | cpumask_var_t mask; |
624 | |
625 | if ((len * BITS_PER_BYTE) < nr_cpu_ids) |
626 | return -EINVAL; |
627 | if (len & (sizeof(compat_ulong_t)-1)) |
628 | return -EINVAL; |
629 | |
630 | if (!alloc_cpumask_var(&mask, GFP_KERNEL)) |
631 | return -ENOMEM; |
632 | |
633 | ret = sched_getaffinity(pid, mask); |
634 | if (ret == 0) { |
635 | size_t retlen = min_t(size_t, len, cpumask_size()); |
636 | |
637 | if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8)) |
638 | ret = -EFAULT; |
639 | else |
640 | ret = retlen; |
641 | } |
642 | free_cpumask_var(mask); |
643 | |
644 | return ret; |
645 | } |
646 | |
647 | int get_compat_itimerspec(struct itimerspec *dst, |
648 | const struct compat_itimerspec __user *src) |
649 | { |
650 | if (get_compat_timespec(&dst->it_interval, &src->it_interval) || |
651 | get_compat_timespec(&dst->it_value, &src->it_value)) |
652 | return -EFAULT; |
653 | return 0; |
654 | } |
655 | |
656 | int put_compat_itimerspec(struct compat_itimerspec __user *dst, |
657 | const struct itimerspec *src) |
658 | { |
659 | if (put_compat_timespec(&src->it_interval, &dst->it_interval) || |
660 | put_compat_timespec(&src->it_value, &dst->it_value)) |
661 | return -EFAULT; |
662 | return 0; |
663 | } |
664 | |
665 | long compat_sys_timer_create(clockid_t which_clock, |
666 | struct compat_sigevent __user *timer_event_spec, |
667 | timer_t __user *created_timer_id) |
668 | { |
669 | struct sigevent __user *event = NULL; |
670 | |
671 | if (timer_event_spec) { |
672 | struct sigevent kevent; |
673 | |
674 | event = compat_alloc_user_space(sizeof(*event)); |
675 | if (get_compat_sigevent(&kevent, timer_event_spec) || |
676 | copy_to_user(event, &kevent, sizeof(*event))) |
677 | return -EFAULT; |
678 | } |
679 | |
680 | return sys_timer_create(which_clock, event, created_timer_id); |
681 | } |
682 | |
683 | long compat_sys_timer_settime(timer_t timer_id, int flags, |
684 | struct compat_itimerspec __user *new, |
685 | struct compat_itimerspec __user *old) |
686 | { |
687 | long err; |
688 | mm_segment_t oldfs; |
689 | struct itimerspec newts, oldts; |
690 | |
691 | if (!new) |
692 | return -EINVAL; |
693 | if (get_compat_itimerspec(&newts, new)) |
694 | return -EFAULT; |
695 | oldfs = get_fs(); |
696 | set_fs(KERNEL_DS); |
697 | err = sys_timer_settime(timer_id, flags, |
698 | (struct itimerspec __user *) &newts, |
699 | (struct itimerspec __user *) &oldts); |
700 | set_fs(oldfs); |
701 | if (!err && old && put_compat_itimerspec(old, &oldts)) |
702 | return -EFAULT; |
703 | return err; |
704 | } |
705 | |
706 | long compat_sys_timer_gettime(timer_t timer_id, |
707 | struct compat_itimerspec __user *setting) |
708 | { |
709 | long err; |
710 | mm_segment_t oldfs; |
711 | struct itimerspec ts; |
712 | |
713 | oldfs = get_fs(); |
714 | set_fs(KERNEL_DS); |
715 | err = sys_timer_gettime(timer_id, |
716 | (struct itimerspec __user *) &ts); |
717 | set_fs(oldfs); |
718 | if (!err && put_compat_itimerspec(setting, &ts)) |
719 | return -EFAULT; |
720 | return err; |
721 | } |
722 | |
723 | long compat_sys_clock_settime(clockid_t which_clock, |
724 | struct compat_timespec __user *tp) |
725 | { |
726 | long err; |
727 | mm_segment_t oldfs; |
728 | struct timespec ts; |
729 | |
730 | if (get_compat_timespec(&ts, tp)) |
731 | return -EFAULT; |
732 | oldfs = get_fs(); |
733 | set_fs(KERNEL_DS); |
734 | err = sys_clock_settime(which_clock, |
735 | (struct timespec __user *) &ts); |
736 | set_fs(oldfs); |
737 | return err; |
738 | } |
739 | |
740 | long compat_sys_clock_gettime(clockid_t which_clock, |
741 | struct compat_timespec __user *tp) |
742 | { |
743 | long err; |
744 | mm_segment_t oldfs; |
745 | struct timespec ts; |
746 | |
747 | oldfs = get_fs(); |
748 | set_fs(KERNEL_DS); |
749 | err = sys_clock_gettime(which_clock, |
750 | (struct timespec __user *) &ts); |
751 | set_fs(oldfs); |
752 | if (!err && put_compat_timespec(&ts, tp)) |
753 | return -EFAULT; |
754 | return err; |
755 | } |
756 | |
757 | long compat_sys_clock_adjtime(clockid_t which_clock, |
758 | struct compat_timex __user *utp) |
759 | { |
760 | struct timex txc; |
761 | mm_segment_t oldfs; |
762 | int err, ret; |
763 | |
764 | err = compat_get_timex(&txc, utp); |
765 | if (err) |
766 | return err; |
767 | |
768 | oldfs = get_fs(); |
769 | set_fs(KERNEL_DS); |
770 | ret = sys_clock_adjtime(which_clock, (struct timex __user *) &txc); |
771 | set_fs(oldfs); |
772 | |
773 | err = compat_put_timex(utp, &txc); |
774 | if (err) |
775 | return err; |
776 | |
777 | return ret; |
778 | } |
779 | |
780 | long compat_sys_clock_getres(clockid_t which_clock, |
781 | struct compat_timespec __user *tp) |
782 | { |
783 | long err; |
784 | mm_segment_t oldfs; |
785 | struct timespec ts; |
786 | |
787 | oldfs = get_fs(); |
788 | set_fs(KERNEL_DS); |
789 | err = sys_clock_getres(which_clock, |
790 | (struct timespec __user *) &ts); |
791 | set_fs(oldfs); |
792 | if (!err && tp && put_compat_timespec(&ts, tp)) |
793 | return -EFAULT; |
794 | return err; |
795 | } |
796 | |
797 | static long compat_clock_nanosleep_restart(struct restart_block *restart) |
798 | { |
799 | long err; |
800 | mm_segment_t oldfs; |
801 | struct timespec tu; |
802 | struct compat_timespec *rmtp = restart->nanosleep.compat_rmtp; |
803 | |
804 | restart->nanosleep.rmtp = (struct timespec __user *) &tu; |
805 | oldfs = get_fs(); |
806 | set_fs(KERNEL_DS); |
807 | err = clock_nanosleep_restart(restart); |
808 | set_fs(oldfs); |
809 | |
810 | if ((err == -ERESTART_RESTARTBLOCK) && rmtp && |
811 | put_compat_timespec(&tu, rmtp)) |
812 | return -EFAULT; |
813 | |
814 | if (err == -ERESTART_RESTARTBLOCK) { |
815 | restart->fn = compat_clock_nanosleep_restart; |
816 | restart->nanosleep.compat_rmtp = rmtp; |
817 | } |
818 | return err; |
819 | } |
820 | |
821 | long compat_sys_clock_nanosleep(clockid_t which_clock, int flags, |
822 | struct compat_timespec __user *rqtp, |
823 | struct compat_timespec __user *rmtp) |
824 | { |
825 | long err; |
826 | mm_segment_t oldfs; |
827 | struct timespec in, out; |
828 | struct restart_block *restart; |
829 | |
830 | if (get_compat_timespec(&in, rqtp)) |
831 | return -EFAULT; |
832 | |
833 | oldfs = get_fs(); |
834 | set_fs(KERNEL_DS); |
835 | err = sys_clock_nanosleep(which_clock, flags, |
836 | (struct timespec __user *) &in, |
837 | (struct timespec __user *) &out); |
838 | set_fs(oldfs); |
839 | |
840 | if ((err == -ERESTART_RESTARTBLOCK) && rmtp && |
841 | put_compat_timespec(&out, rmtp)) |
842 | return -EFAULT; |
843 | |
844 | if (err == -ERESTART_RESTARTBLOCK) { |
845 | restart = ¤t_thread_info()->restart_block; |
846 | restart->fn = compat_clock_nanosleep_restart; |
847 | restart->nanosleep.compat_rmtp = rmtp; |
848 | } |
849 | return err; |
850 | } |
851 | |
852 | /* |
853 | * We currently only need the following fields from the sigevent |
854 | * structure: sigev_value, sigev_signo, sig_notify and (sometimes |
855 | * sigev_notify_thread_id). The others are handled in user mode. |
856 | * We also assume that copying sigev_value.sival_int is sufficient |
857 | * to keep all the bits of sigev_value.sival_ptr intact. |
858 | */ |
859 | int get_compat_sigevent(struct sigevent *event, |
860 | const struct compat_sigevent __user *u_event) |
861 | { |
862 | memset(event, 0, sizeof(*event)); |
863 | return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) || |
864 | __get_user(event->sigev_value.sival_int, |
865 | &u_event->sigev_value.sival_int) || |
866 | __get_user(event->sigev_signo, &u_event->sigev_signo) || |
867 | __get_user(event->sigev_notify, &u_event->sigev_notify) || |
868 | __get_user(event->sigev_notify_thread_id, |
869 | &u_event->sigev_notify_thread_id)) |
870 | ? -EFAULT : 0; |
871 | } |
872 | |
873 | long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask, |
874 | unsigned long bitmap_size) |
875 | { |
876 | int i, j; |
877 | unsigned long m; |
878 | compat_ulong_t um; |
879 | unsigned long nr_compat_longs; |
880 | |
881 | /* align bitmap up to nearest compat_long_t boundary */ |
882 | bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); |
883 | |
884 | if (!access_ok(VERIFY_READ, umask, bitmap_size / 8)) |
885 | return -EFAULT; |
886 | |
887 | nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); |
888 | |
889 | for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) { |
890 | m = 0; |
891 | |
892 | for (j = 0; j < sizeof(m)/sizeof(um); j++) { |
893 | /* |
894 | * We dont want to read past the end of the userspace |
895 | * bitmap. We must however ensure the end of the |
896 | * kernel bitmap is zeroed. |
897 | */ |
898 | if (nr_compat_longs-- > 0) { |
899 | if (__get_user(um, umask)) |
900 | return -EFAULT; |
901 | } else { |
902 | um = 0; |
903 | } |
904 | |
905 | umask++; |
906 | m |= (long)um << (j * BITS_PER_COMPAT_LONG); |
907 | } |
908 | *mask++ = m; |
909 | } |
910 | |
911 | return 0; |
912 | } |
913 | |
914 | long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask, |
915 | unsigned long bitmap_size) |
916 | { |
917 | int i, j; |
918 | unsigned long m; |
919 | compat_ulong_t um; |
920 | unsigned long nr_compat_longs; |
921 | |
922 | /* align bitmap up to nearest compat_long_t boundary */ |
923 | bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); |
924 | |
925 | if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8)) |
926 | return -EFAULT; |
927 | |
928 | nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); |
929 | |
930 | for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) { |
931 | m = *mask++; |
932 | |
933 | for (j = 0; j < sizeof(m)/sizeof(um); j++) { |
934 | um = m; |
935 | |
936 | /* |
937 | * We dont want to write past the end of the userspace |
938 | * bitmap. |
939 | */ |
940 | if (nr_compat_longs-- > 0) { |
941 | if (__put_user(um, umask)) |
942 | return -EFAULT; |
943 | } |
944 | |
945 | umask++; |
946 | m >>= 4*sizeof(um); |
947 | m >>= 4*sizeof(um); |
948 | } |
949 | } |
950 | |
951 | return 0; |
952 | } |
953 | |
954 | void |
955 | sigset_from_compat(sigset_t *set, const compat_sigset_t *compat) |
956 | { |
957 | switch (_NSIG_WORDS) { |
958 | case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 ); |
959 | case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 ); |
960 | case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 ); |
961 | case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 ); |
962 | } |
963 | } |
964 | EXPORT_SYMBOL_GPL(sigset_from_compat); |
965 | |
966 | void |
967 | sigset_to_compat(compat_sigset_t *compat, const sigset_t *set) |
968 | { |
969 | switch (_NSIG_WORDS) { |
970 | case 4: compat->sig[7] = (set->sig[3] >> 32); compat->sig[6] = set->sig[3]; |
971 | case 3: compat->sig[5] = (set->sig[2] >> 32); compat->sig[4] = set->sig[2]; |
972 | case 2: compat->sig[3] = (set->sig[1] >> 32); compat->sig[2] = set->sig[1]; |
973 | case 1: compat->sig[1] = (set->sig[0] >> 32); compat->sig[0] = set->sig[0]; |
974 | } |
975 | } |
976 | |
977 | COMPAT_SYSCALL_DEFINE4(rt_sigtimedwait, compat_sigset_t __user *, uthese, |
978 | struct compat_siginfo __user *, uinfo, |
979 | struct compat_timespec __user *, uts, compat_size_t, sigsetsize) |
980 | { |
981 | compat_sigset_t s32; |
982 | sigset_t s; |
983 | struct timespec t; |
984 | siginfo_t info; |
985 | long ret; |
986 | |
987 | if (sigsetsize != sizeof(sigset_t)) |
988 | return -EINVAL; |
989 | |
990 | if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t))) |
991 | return -EFAULT; |
992 | sigset_from_compat(&s, &s32); |
993 | |
994 | if (uts) { |
995 | if (compat_get_timespec(&t, uts)) |
996 | return -EFAULT; |
997 | } |
998 | |
999 | ret = do_sigtimedwait(&s, &info, uts ? &t : NULL); |
1000 | |
1001 | if (ret > 0 && uinfo) { |
1002 | if (copy_siginfo_to_user32(uinfo, &info)) |
1003 | ret = -EFAULT; |
1004 | } |
1005 | |
1006 | return ret; |
1007 | } |
1008 | |
1009 | #ifdef __ARCH_WANT_COMPAT_SYS_TIME |
1010 | |
1011 | /* compat_time_t is a 32 bit "long" and needs to get converted. */ |
1012 | |
1013 | asmlinkage long compat_sys_time(compat_time_t __user * tloc) |
1014 | { |
1015 | compat_time_t i; |
1016 | struct timeval tv; |
1017 | |
1018 | do_gettimeofday(&tv); |
1019 | i = tv.tv_sec; |
1020 | |
1021 | if (tloc) { |
1022 | if (put_user(i,tloc)) |
1023 | return -EFAULT; |
1024 | } |
1025 | force_successful_syscall_return(); |
1026 | return i; |
1027 | } |
1028 | |
1029 | asmlinkage long compat_sys_stime(compat_time_t __user *tptr) |
1030 | { |
1031 | struct timespec tv; |
1032 | int err; |
1033 | |
1034 | if (get_user(tv.tv_sec, tptr)) |
1035 | return -EFAULT; |
1036 | |
1037 | tv.tv_nsec = 0; |
1038 | |
1039 | err = security_settime(&tv, NULL); |
1040 | if (err) |
1041 | return err; |
1042 | |
1043 | do_settimeofday(&tv); |
1044 | return 0; |
1045 | } |
1046 | |
1047 | #endif /* __ARCH_WANT_COMPAT_SYS_TIME */ |
1048 | |
1049 | asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp) |
1050 | { |
1051 | struct timex txc; |
1052 | int err, ret; |
1053 | |
1054 | err = compat_get_timex(&txc, utp); |
1055 | if (err) |
1056 | return err; |
1057 | |
1058 | ret = do_adjtimex(&txc); |
1059 | |
1060 | err = compat_put_timex(utp, &txc); |
1061 | if (err) |
1062 | return err; |
1063 | |
1064 | return ret; |
1065 | } |
1066 | |
1067 | #ifdef CONFIG_NUMA |
1068 | asmlinkage long compat_sys_move_pages(pid_t pid, unsigned long nr_pages, |
1069 | compat_uptr_t __user *pages32, |
1070 | const int __user *nodes, |
1071 | int __user *status, |
1072 | int flags) |
1073 | { |
1074 | const void __user * __user *pages; |
1075 | int i; |
1076 | |
1077 | pages = compat_alloc_user_space(nr_pages * sizeof(void *)); |
1078 | for (i = 0; i < nr_pages; i++) { |
1079 | compat_uptr_t p; |
1080 | |
1081 | if (get_user(p, pages32 + i) || |
1082 | put_user(compat_ptr(p), pages + i)) |
1083 | return -EFAULT; |
1084 | } |
1085 | return sys_move_pages(pid, nr_pages, pages, nodes, status, flags); |
1086 | } |
1087 | |
1088 | asmlinkage long compat_sys_migrate_pages(compat_pid_t pid, |
1089 | compat_ulong_t maxnode, |
1090 | const compat_ulong_t __user *old_nodes, |
1091 | const compat_ulong_t __user *new_nodes) |
1092 | { |
1093 | unsigned long __user *old = NULL; |
1094 | unsigned long __user *new = NULL; |
1095 | nodemask_t tmp_mask; |
1096 | unsigned long nr_bits; |
1097 | unsigned long size; |
1098 | |
1099 | nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES); |
1100 | size = ALIGN(nr_bits, BITS_PER_LONG) / 8; |
1101 | if (old_nodes) { |
1102 | if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits)) |
1103 | return -EFAULT; |
1104 | old = compat_alloc_user_space(new_nodes ? size * 2 : size); |
1105 | if (new_nodes) |
1106 | new = old + size / sizeof(unsigned long); |
1107 | if (copy_to_user(old, nodes_addr(tmp_mask), size)) |
1108 | return -EFAULT; |
1109 | } |
1110 | if (new_nodes) { |
1111 | if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits)) |
1112 | return -EFAULT; |
1113 | if (new == NULL) |
1114 | new = compat_alloc_user_space(size); |
1115 | if (copy_to_user(new, nodes_addr(tmp_mask), size)) |
1116 | return -EFAULT; |
1117 | } |
1118 | return sys_migrate_pages(pid, nr_bits + 1, old, new); |
1119 | } |
1120 | #endif |
1121 | |
1122 | COMPAT_SYSCALL_DEFINE2(sched_rr_get_interval, |
1123 | compat_pid_t, pid, |
1124 | struct compat_timespec __user *, interval) |
1125 | { |
1126 | struct timespec t; |
1127 | int ret; |
1128 | mm_segment_t old_fs = get_fs(); |
1129 | |
1130 | set_fs(KERNEL_DS); |
1131 | ret = sys_sched_rr_get_interval(pid, (struct timespec __user *)&t); |
1132 | set_fs(old_fs); |
1133 | if (put_compat_timespec(&t, interval)) |
1134 | return -EFAULT; |
1135 | return ret; |
1136 | } |
1137 | |
1138 | /* |
1139 | * Allocate user-space memory for the duration of a single system call, |
1140 | * in order to marshall parameters inside a compat thunk. |
1141 | */ |
1142 | void __user *compat_alloc_user_space(unsigned long len) |
1143 | { |
1144 | void __user *ptr; |
1145 | |
1146 | /* If len would occupy more than half of the entire compat space... */ |
1147 | if (unlikely(len > (((compat_uptr_t)~0) >> 1))) |
1148 | return NULL; |
1149 | |
1150 | ptr = arch_compat_alloc_user_space(len); |
1151 | |
1152 | if (unlikely(!access_ok(VERIFY_WRITE, ptr, len))) |
1153 | return NULL; |
1154 | |
1155 | return ptr; |
1156 | } |
1157 | EXPORT_SYMBOL_GPL(compat_alloc_user_space); |
1158 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9