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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/kernel/compat.c | |
3 | * | |
4 | * Kernel compatibililty routines for e.g. 32 bit syscall support | |
5 | * on 64 bit kernels. | |
6 | * | |
7 | * Copyright (C) 2002-2003 Stephen Rothwell, IBM Corporation | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 as | |
11 | * published by the Free Software Foundation. | |
12 | */ | |
13 | ||
14 | #include <linux/linkage.h> | |
15 | #include <linux/compat.h> | |
16 | #include <linux/errno.h> | |
17 | #include <linux/time.h> | |
18 | #include <linux/signal.h> | |
19 | #include <linux/sched.h> /* for MAX_SCHEDULE_TIMEOUT */ | |
1da177e4 LT |
20 | #include <linux/syscalls.h> |
21 | #include <linux/unistd.h> | |
22 | #include <linux/security.h> | |
3158e941 | 23 | #include <linux/timex.h> |
6e5fdeed | 24 | #include <linux/export.h> |
1b2db9fb | 25 | #include <linux/migrate.h> |
1711ef38 | 26 | #include <linux/posix-timers.h> |
f06febc9 | 27 | #include <linux/times.h> |
e3d5a27d | 28 | #include <linux/ptrace.h> |
5a0e3ad6 | 29 | #include <linux/gfp.h> |
1da177e4 | 30 | |
7c0f6ba6 | 31 | #include <linux/uaccess.h> |
1da177e4 | 32 | |
3a4d44b6 AV |
33 | int compat_get_timex(struct timex *txc, const struct compat_timex __user *utp) |
34 | { | |
35 | struct compat_timex tx32; | |
36 | ||
37 | if (copy_from_user(&tx32, utp, sizeof(struct compat_timex))) | |
65f5d80b RC |
38 | return -EFAULT; |
39 | ||
3a4d44b6 AV |
40 | txc->modes = tx32.modes; |
41 | txc->offset = tx32.offset; | |
42 | txc->freq = tx32.freq; | |
43 | txc->maxerror = tx32.maxerror; | |
44 | txc->esterror = tx32.esterror; | |
45 | txc->status = tx32.status; | |
46 | txc->constant = tx32.constant; | |
47 | txc->precision = tx32.precision; | |
48 | txc->tolerance = tx32.tolerance; | |
49 | txc->time.tv_sec = tx32.time.tv_sec; | |
50 | txc->time.tv_usec = tx32.time.tv_usec; | |
51 | txc->tick = tx32.tick; | |
52 | txc->ppsfreq = tx32.ppsfreq; | |
53 | txc->jitter = tx32.jitter; | |
54 | txc->shift = tx32.shift; | |
55 | txc->stabil = tx32.stabil; | |
56 | txc->jitcnt = tx32.jitcnt; | |
57 | txc->calcnt = tx32.calcnt; | |
58 | txc->errcnt = tx32.errcnt; | |
59 | txc->stbcnt = tx32.stbcnt; | |
60 | ||
65f5d80b RC |
61 | return 0; |
62 | } | |
63 | ||
3a4d44b6 AV |
64 | int compat_put_timex(struct compat_timex __user *utp, const struct timex *txc) |
65 | { | |
66 | struct compat_timex tx32; | |
67 | ||
68 | memset(&tx32, 0, sizeof(struct compat_timex)); | |
69 | tx32.modes = txc->modes; | |
70 | tx32.offset = txc->offset; | |
71 | tx32.freq = txc->freq; | |
72 | tx32.maxerror = txc->maxerror; | |
73 | tx32.esterror = txc->esterror; | |
74 | tx32.status = txc->status; | |
75 | tx32.constant = txc->constant; | |
76 | tx32.precision = txc->precision; | |
77 | tx32.tolerance = txc->tolerance; | |
78 | tx32.time.tv_sec = txc->time.tv_sec; | |
79 | tx32.time.tv_usec = txc->time.tv_usec; | |
80 | tx32.tick = txc->tick; | |
81 | tx32.ppsfreq = txc->ppsfreq; | |
82 | tx32.jitter = txc->jitter; | |
83 | tx32.shift = txc->shift; | |
84 | tx32.stabil = txc->stabil; | |
85 | tx32.jitcnt = txc->jitcnt; | |
86 | tx32.calcnt = txc->calcnt; | |
87 | tx32.errcnt = txc->errcnt; | |
88 | tx32.stbcnt = txc->stbcnt; | |
89 | tx32.tai = txc->tai; | |
90 | if (copy_to_user(utp, &tx32, sizeof(struct compat_timex))) | |
65f5d80b RC |
91 | return -EFAULT; |
92 | return 0; | |
93 | } | |
94 | ||
81993e81 | 95 | static int __compat_get_timeval(struct timeval *tv, const struct compat_timeval __user *ctv) |
6684ba20 PA |
96 | { |
97 | return (!access_ok(VERIFY_READ, ctv, sizeof(*ctv)) || | |
98 | __get_user(tv->tv_sec, &ctv->tv_sec) || | |
99 | __get_user(tv->tv_usec, &ctv->tv_usec)) ? -EFAULT : 0; | |
100 | } | |
6684ba20 | 101 | |
81993e81 | 102 | static int __compat_put_timeval(const struct timeval *tv, struct compat_timeval __user *ctv) |
6684ba20 PA |
103 | { |
104 | return (!access_ok(VERIFY_WRITE, ctv, sizeof(*ctv)) || | |
105 | __put_user(tv->tv_sec, &ctv->tv_sec) || | |
106 | __put_user(tv->tv_usec, &ctv->tv_usec)) ? -EFAULT : 0; | |
107 | } | |
6684ba20 | 108 | |
81993e81 | 109 | static int __compat_get_timespec(struct timespec *ts, const struct compat_timespec __user *cts) |
1da177e4 LT |
110 | { |
111 | return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) || | |
112 | __get_user(ts->tv_sec, &cts->tv_sec) || | |
113 | __get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0; | |
114 | } | |
115 | ||
81993e81 | 116 | static int __compat_put_timespec(const struct timespec *ts, struct compat_timespec __user *cts) |
1da177e4 LT |
117 | { |
118 | return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) || | |
119 | __put_user(ts->tv_sec, &cts->tv_sec) || | |
120 | __put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0; | |
121 | } | |
122 | ||
6684ba20 PA |
123 | int compat_get_timeval(struct timeval *tv, const void __user *utv) |
124 | { | |
125 | if (COMPAT_USE_64BIT_TIME) | |
6516a466 | 126 | return copy_from_user(tv, utv, sizeof(*tv)) ? -EFAULT : 0; |
6684ba20 | 127 | else |
81993e81 | 128 | return __compat_get_timeval(tv, utv); |
6684ba20 PA |
129 | } |
130 | EXPORT_SYMBOL_GPL(compat_get_timeval); | |
131 | ||
132 | int compat_put_timeval(const struct timeval *tv, void __user *utv) | |
133 | { | |
134 | if (COMPAT_USE_64BIT_TIME) | |
6516a466 | 135 | return copy_to_user(utv, tv, sizeof(*tv)) ? -EFAULT : 0; |
6684ba20 | 136 | else |
81993e81 | 137 | return __compat_put_timeval(tv, utv); |
6684ba20 PA |
138 | } |
139 | EXPORT_SYMBOL_GPL(compat_put_timeval); | |
140 | ||
141 | int compat_get_timespec(struct timespec *ts, const void __user *uts) | |
142 | { | |
143 | if (COMPAT_USE_64BIT_TIME) | |
6516a466 | 144 | return copy_from_user(ts, uts, sizeof(*ts)) ? -EFAULT : 0; |
6684ba20 | 145 | else |
81993e81 | 146 | return __compat_get_timespec(ts, uts); |
6684ba20 PA |
147 | } |
148 | EXPORT_SYMBOL_GPL(compat_get_timespec); | |
149 | ||
150 | int compat_put_timespec(const struct timespec *ts, void __user *uts) | |
151 | { | |
152 | if (COMPAT_USE_64BIT_TIME) | |
6516a466 | 153 | return copy_to_user(uts, ts, sizeof(*ts)) ? -EFAULT : 0; |
6684ba20 | 154 | else |
81993e81 | 155 | return __compat_put_timespec(ts, uts); |
6684ba20 PA |
156 | } |
157 | EXPORT_SYMBOL_GPL(compat_put_timespec); | |
158 | ||
81993e81 PA |
159 | int compat_convert_timespec(struct timespec __user **kts, |
160 | const void __user *cts) | |
161 | { | |
162 | struct timespec ts; | |
163 | struct timespec __user *uts; | |
164 | ||
165 | if (!cts || COMPAT_USE_64BIT_TIME) { | |
166 | *kts = (struct timespec __user *)cts; | |
167 | return 0; | |
168 | } | |
169 | ||
170 | uts = compat_alloc_user_space(sizeof(ts)); | |
171 | if (!uts) | |
172 | return -EFAULT; | |
173 | if (compat_get_timespec(&ts, cts)) | |
174 | return -EFAULT; | |
175 | if (copy_to_user(uts, &ts, sizeof(ts))) | |
176 | return -EFAULT; | |
177 | ||
178 | *kts = uts; | |
179 | return 0; | |
180 | } | |
181 | ||
54ad9c46 | 182 | int get_compat_itimerval(struct itimerval *o, const struct compat_itimerval __user *i) |
1da177e4 | 183 | { |
54ad9c46 | 184 | struct compat_itimerval v32; |
baa73d9e | 185 | |
54ad9c46 AV |
186 | if (copy_from_user(&v32, i, sizeof(struct compat_itimerval))) |
187 | return -EFAULT; | |
188 | o->it_interval.tv_sec = v32.it_interval.tv_sec; | |
189 | o->it_interval.tv_usec = v32.it_interval.tv_usec; | |
190 | o->it_value.tv_sec = v32.it_value.tv_sec; | |
191 | o->it_value.tv_usec = v32.it_value.tv_usec; | |
192 | return 0; | |
1da177e4 LT |
193 | } |
194 | ||
54ad9c46 | 195 | int put_compat_itimerval(struct compat_itimerval __user *o, const struct itimerval *i) |
1da177e4 | 196 | { |
54ad9c46 | 197 | struct compat_itimerval v32; |
1da177e4 | 198 | |
54ad9c46 AV |
199 | v32.it_interval.tv_sec = i->it_interval.tv_sec; |
200 | v32.it_interval.tv_usec = i->it_interval.tv_usec; | |
201 | v32.it_value.tv_sec = i->it_value.tv_sec; | |
202 | v32.it_value.tv_usec = i->it_value.tv_usec; | |
203 | return copy_to_user(o, &v32, sizeof(struct compat_itimerval)) ? -EFAULT : 0; | |
1da177e4 LT |
204 | } |
205 | ||
f06febc9 FM |
206 | static compat_clock_t clock_t_to_compat_clock_t(clock_t x) |
207 | { | |
208 | return compat_jiffies_to_clock_t(clock_t_to_jiffies(x)); | |
209 | } | |
210 | ||
62a6fa97 | 211 | COMPAT_SYSCALL_DEFINE1(times, struct compat_tms __user *, tbuf) |
1da177e4 | 212 | { |
1da177e4 | 213 | if (tbuf) { |
f06febc9 | 214 | struct tms tms; |
1da177e4 | 215 | struct compat_tms tmp; |
f06febc9 FM |
216 | |
217 | do_sys_times(&tms); | |
218 | /* Convert our struct tms to the compat version. */ | |
219 | tmp.tms_utime = clock_t_to_compat_clock_t(tms.tms_utime); | |
220 | tmp.tms_stime = clock_t_to_compat_clock_t(tms.tms_stime); | |
221 | tmp.tms_cutime = clock_t_to_compat_clock_t(tms.tms_cutime); | |
222 | tmp.tms_cstime = clock_t_to_compat_clock_t(tms.tms_cstime); | |
1da177e4 LT |
223 | if (copy_to_user(tbuf, &tmp, sizeof(tmp))) |
224 | return -EFAULT; | |
225 | } | |
e3d5a27d | 226 | force_successful_syscall_return(); |
1da177e4 LT |
227 | return compat_jiffies_to_clock_t(jiffies); |
228 | } | |
229 | ||
be84cb43 CM |
230 | #ifdef __ARCH_WANT_SYS_SIGPENDING |
231 | ||
1da177e4 LT |
232 | /* |
233 | * Assumption: old_sigset_t and compat_old_sigset_t are both | |
234 | * types that can be passed to put_user()/get_user(). | |
235 | */ | |
236 | ||
62a6fa97 | 237 | COMPAT_SYSCALL_DEFINE1(sigpending, compat_old_sigset_t __user *, set) |
1da177e4 LT |
238 | { |
239 | old_sigset_t s; | |
240 | long ret; | |
241 | mm_segment_t old_fs = get_fs(); | |
242 | ||
243 | set_fs(KERNEL_DS); | |
244 | ret = sys_sigpending((old_sigset_t __user *) &s); | |
245 | set_fs(old_fs); | |
246 | if (ret == 0) | |
247 | ret = put_user(s, set); | |
248 | return ret; | |
249 | } | |
250 | ||
be84cb43 CM |
251 | #endif |
252 | ||
253 | #ifdef __ARCH_WANT_SYS_SIGPROCMASK | |
254 | ||
b7dafa0e JK |
255 | /* |
256 | * sys_sigprocmask SIG_SETMASK sets the first (compat) word of the | |
257 | * blocked set of signals to the supplied signal set | |
258 | */ | |
259 | static inline void compat_sig_setmask(sigset_t *blocked, compat_sigset_word set) | |
1da177e4 | 260 | { |
b7dafa0e JK |
261 | memcpy(blocked->sig, &set, sizeof(set)); |
262 | } | |
1da177e4 | 263 | |
5cf22100 AV |
264 | COMPAT_SYSCALL_DEFINE3(sigprocmask, int, how, |
265 | compat_old_sigset_t __user *, nset, | |
266 | compat_old_sigset_t __user *, oset) | |
b7dafa0e JK |
267 | { |
268 | old_sigset_t old_set, new_set; | |
269 | sigset_t new_blocked; | |
270 | ||
271 | old_set = current->blocked.sig[0]; | |
272 | ||
273 | if (nset) { | |
274 | if (get_user(new_set, nset)) | |
275 | return -EFAULT; | |
276 | new_set &= ~(sigmask(SIGKILL) | sigmask(SIGSTOP)); | |
277 | ||
278 | new_blocked = current->blocked; | |
279 | ||
280 | switch (how) { | |
281 | case SIG_BLOCK: | |
282 | sigaddsetmask(&new_blocked, new_set); | |
283 | break; | |
284 | case SIG_UNBLOCK: | |
285 | sigdelsetmask(&new_blocked, new_set); | |
286 | break; | |
287 | case SIG_SETMASK: | |
288 | compat_sig_setmask(&new_blocked, new_set); | |
289 | break; | |
290 | default: | |
291 | return -EINVAL; | |
292 | } | |
293 | ||
294 | set_current_blocked(&new_blocked); | |
295 | } | |
296 | ||
297 | if (oset) { | |
298 | if (put_user(old_set, oset)) | |
299 | return -EFAULT; | |
300 | } | |
301 | ||
302 | return 0; | |
1da177e4 LT |
303 | } |
304 | ||
be84cb43 CM |
305 | #endif |
306 | ||
62a6fa97 HC |
307 | COMPAT_SYSCALL_DEFINE2(setrlimit, unsigned int, resource, |
308 | struct compat_rlimit __user *, rlim) | |
1da177e4 LT |
309 | { |
310 | struct rlimit r; | |
1da177e4 LT |
311 | |
312 | if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) || | |
313 | __get_user(r.rlim_cur, &rlim->rlim_cur) || | |
314 | __get_user(r.rlim_max, &rlim->rlim_max)) | |
315 | return -EFAULT; | |
316 | ||
317 | if (r.rlim_cur == COMPAT_RLIM_INFINITY) | |
318 | r.rlim_cur = RLIM_INFINITY; | |
319 | if (r.rlim_max == COMPAT_RLIM_INFINITY) | |
320 | r.rlim_max = RLIM_INFINITY; | |
b9518345 | 321 | return do_prlimit(current, resource, &r, NULL); |
1da177e4 LT |
322 | } |
323 | ||
324 | #ifdef COMPAT_RLIM_OLD_INFINITY | |
325 | ||
62a6fa97 HC |
326 | COMPAT_SYSCALL_DEFINE2(old_getrlimit, unsigned int, resource, |
327 | struct compat_rlimit __user *, rlim) | |
1da177e4 LT |
328 | { |
329 | struct rlimit r; | |
330 | int ret; | |
331 | mm_segment_t old_fs = get_fs(); | |
332 | ||
333 | set_fs(KERNEL_DS); | |
dce44e03 | 334 | ret = sys_old_getrlimit(resource, (struct rlimit __user *)&r); |
1da177e4 LT |
335 | set_fs(old_fs); |
336 | ||
337 | if (!ret) { | |
338 | if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY) | |
339 | r.rlim_cur = COMPAT_RLIM_INFINITY; | |
340 | if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY) | |
341 | r.rlim_max = COMPAT_RLIM_INFINITY; | |
342 | ||
343 | if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) || | |
344 | __put_user(r.rlim_cur, &rlim->rlim_cur) || | |
345 | __put_user(r.rlim_max, &rlim->rlim_max)) | |
346 | return -EFAULT; | |
347 | } | |
348 | return ret; | |
349 | } | |
350 | ||
351 | #endif | |
352 | ||
62a6fa97 HC |
353 | COMPAT_SYSCALL_DEFINE2(getrlimit, unsigned int, resource, |
354 | struct compat_rlimit __user *, rlim) | |
1da177e4 LT |
355 | { |
356 | struct rlimit r; | |
357 | int ret; | |
1da177e4 | 358 | |
b9518345 | 359 | ret = do_prlimit(current, resource, NULL, &r); |
1da177e4 LT |
360 | if (!ret) { |
361 | if (r.rlim_cur > COMPAT_RLIM_INFINITY) | |
362 | r.rlim_cur = COMPAT_RLIM_INFINITY; | |
363 | if (r.rlim_max > COMPAT_RLIM_INFINITY) | |
364 | r.rlim_max = COMPAT_RLIM_INFINITY; | |
365 | ||
366 | if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) || | |
367 | __put_user(r.rlim_cur, &rlim->rlim_cur) || | |
368 | __put_user(r.rlim_max, &rlim->rlim_max)) | |
369 | return -EFAULT; | |
370 | } | |
371 | return ret; | |
372 | } | |
373 | ||
374 | int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru) | |
375 | { | |
376 | if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) || | |
377 | __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) || | |
378 | __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) || | |
379 | __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) || | |
380 | __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) || | |
381 | __put_user(r->ru_maxrss, &ru->ru_maxrss) || | |
382 | __put_user(r->ru_ixrss, &ru->ru_ixrss) || | |
383 | __put_user(r->ru_idrss, &ru->ru_idrss) || | |
384 | __put_user(r->ru_isrss, &ru->ru_isrss) || | |
385 | __put_user(r->ru_minflt, &ru->ru_minflt) || | |
386 | __put_user(r->ru_majflt, &ru->ru_majflt) || | |
387 | __put_user(r->ru_nswap, &ru->ru_nswap) || | |
388 | __put_user(r->ru_inblock, &ru->ru_inblock) || | |
389 | __put_user(r->ru_oublock, &ru->ru_oublock) || | |
390 | __put_user(r->ru_msgsnd, &ru->ru_msgsnd) || | |
391 | __put_user(r->ru_msgrcv, &ru->ru_msgrcv) || | |
392 | __put_user(r->ru_nsignals, &ru->ru_nsignals) || | |
393 | __put_user(r->ru_nvcsw, &ru->ru_nvcsw) || | |
394 | __put_user(r->ru_nivcsw, &ru->ru_nivcsw)) | |
395 | return -EFAULT; | |
396 | return 0; | |
397 | } | |
398 | ||
8d9807b1 AV |
399 | COMPAT_SYSCALL_DEFINE4(wait4, |
400 | compat_pid_t, pid, | |
401 | compat_uint_t __user *, stat_addr, | |
402 | int, options, | |
403 | struct compat_rusage __user *, ru) | |
1da177e4 LT |
404 | { |
405 | if (!ru) { | |
406 | return sys_wait4(pid, stat_addr, options, NULL); | |
407 | } else { | |
408 | struct rusage r; | |
409 | int ret; | |
410 | unsigned int status; | |
411 | mm_segment_t old_fs = get_fs(); | |
412 | ||
413 | set_fs (KERNEL_DS); | |
414 | ret = sys_wait4(pid, | |
415 | (stat_addr ? | |
416 | (unsigned int __user *) &status : NULL), | |
417 | options, (struct rusage __user *) &r); | |
418 | set_fs (old_fs); | |
419 | ||
420 | if (ret > 0) { | |
421 | if (put_compat_rusage(&r, ru)) | |
422 | return -EFAULT; | |
423 | if (stat_addr && put_user(status, stat_addr)) | |
424 | return -EFAULT; | |
425 | } | |
426 | return ret; | |
427 | } | |
428 | } | |
429 | ||
8d9807b1 AV |
430 | COMPAT_SYSCALL_DEFINE5(waitid, |
431 | int, which, compat_pid_t, pid, | |
432 | struct compat_siginfo __user *, uinfo, int, options, | |
433 | struct compat_rusage __user *, uru) | |
1da177e4 LT |
434 | { |
435 | siginfo_t info; | |
436 | struct rusage ru; | |
437 | long ret; | |
438 | mm_segment_t old_fs = get_fs(); | |
439 | ||
440 | memset(&info, 0, sizeof(info)); | |
441 | ||
442 | set_fs(KERNEL_DS); | |
443 | ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options, | |
444 | uru ? (struct rusage __user *)&ru : NULL); | |
445 | set_fs(old_fs); | |
446 | ||
447 | if ((ret < 0) || (info.si_signo == 0)) | |
448 | return ret; | |
449 | ||
450 | if (uru) { | |
a566c288 AV |
451 | /* sys_waitid() overwrites everything in ru */ |
452 | if (COMPAT_USE_64BIT_TIME) | |
453 | ret = copy_to_user(uru, &ru, sizeof(ru)); | |
454 | else | |
455 | ret = put_compat_rusage(&ru, uru); | |
1da177e4 | 456 | if (ret) |
bffea77c | 457 | return -EFAULT; |
1da177e4 LT |
458 | } |
459 | ||
460 | BUG_ON(info.si_code & __SI_MASK); | |
461 | info.si_code |= __SI_CHLD; | |
462 | return copy_siginfo_to_user32(uinfo, &info); | |
463 | } | |
464 | ||
465 | static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr, | |
a45185d2 | 466 | unsigned len, struct cpumask *new_mask) |
1da177e4 LT |
467 | { |
468 | unsigned long *k; | |
469 | ||
a45185d2 RR |
470 | if (len < cpumask_size()) |
471 | memset(new_mask, 0, cpumask_size()); | |
472 | else if (len > cpumask_size()) | |
473 | len = cpumask_size(); | |
1da177e4 | 474 | |
a45185d2 | 475 | k = cpumask_bits(new_mask); |
1da177e4 LT |
476 | return compat_get_bitmap(k, user_mask_ptr, len * 8); |
477 | } | |
478 | ||
62a6fa97 HC |
479 | COMPAT_SYSCALL_DEFINE3(sched_setaffinity, compat_pid_t, pid, |
480 | unsigned int, len, | |
481 | compat_ulong_t __user *, user_mask_ptr) | |
1da177e4 | 482 | { |
a45185d2 | 483 | cpumask_var_t new_mask; |
1da177e4 LT |
484 | int retval; |
485 | ||
a45185d2 RR |
486 | if (!alloc_cpumask_var(&new_mask, GFP_KERNEL)) |
487 | return -ENOMEM; | |
488 | ||
489 | retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask); | |
1da177e4 | 490 | if (retval) |
a45185d2 | 491 | goto out; |
1da177e4 | 492 | |
a45185d2 RR |
493 | retval = sched_setaffinity(pid, new_mask); |
494 | out: | |
495 | free_cpumask_var(new_mask); | |
496 | return retval; | |
1da177e4 LT |
497 | } |
498 | ||
62a6fa97 HC |
499 | COMPAT_SYSCALL_DEFINE3(sched_getaffinity, compat_pid_t, pid, unsigned int, len, |
500 | compat_ulong_t __user *, user_mask_ptr) | |
1da177e4 LT |
501 | { |
502 | int ret; | |
a45185d2 | 503 | cpumask_var_t mask; |
1da177e4 | 504 | |
fa9dc265 KM |
505 | if ((len * BITS_PER_BYTE) < nr_cpu_ids) |
506 | return -EINVAL; | |
507 | if (len & (sizeof(compat_ulong_t)-1)) | |
1da177e4 LT |
508 | return -EINVAL; |
509 | ||
a45185d2 RR |
510 | if (!alloc_cpumask_var(&mask, GFP_KERNEL)) |
511 | return -ENOMEM; | |
512 | ||
513 | ret = sched_getaffinity(pid, mask); | |
fa9dc265 KM |
514 | if (ret == 0) { |
515 | size_t retlen = min_t(size_t, len, cpumask_size()); | |
1da177e4 | 516 | |
fa9dc265 KM |
517 | if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8)) |
518 | ret = -EFAULT; | |
519 | else | |
520 | ret = retlen; | |
521 | } | |
a45185d2 | 522 | free_cpumask_var(mask); |
fa9dc265 | 523 | |
a45185d2 | 524 | return ret; |
1da177e4 LT |
525 | } |
526 | ||
83f5d126 DL |
527 | int get_compat_itimerspec(struct itimerspec *dst, |
528 | const struct compat_itimerspec __user *src) | |
bd3a8492 | 529 | { |
81993e81 PA |
530 | if (__compat_get_timespec(&dst->it_interval, &src->it_interval) || |
531 | __compat_get_timespec(&dst->it_value, &src->it_value)) | |
1da177e4 LT |
532 | return -EFAULT; |
533 | return 0; | |
bd3a8492 | 534 | } |
1da177e4 | 535 | |
83f5d126 DL |
536 | int put_compat_itimerspec(struct compat_itimerspec __user *dst, |
537 | const struct itimerspec *src) | |
bd3a8492 | 538 | { |
81993e81 PA |
539 | if (__compat_put_timespec(&src->it_interval, &dst->it_interval) || |
540 | __compat_put_timespec(&src->it_value, &dst->it_value)) | |
1da177e4 LT |
541 | return -EFAULT; |
542 | return 0; | |
bd3a8492 | 543 | } |
1da177e4 | 544 | |
1da177e4 LT |
545 | /* |
546 | * We currently only need the following fields from the sigevent | |
547 | * structure: sigev_value, sigev_signo, sig_notify and (sometimes | |
548 | * sigev_notify_thread_id). The others are handled in user mode. | |
549 | * We also assume that copying sigev_value.sival_int is sufficient | |
550 | * to keep all the bits of sigev_value.sival_ptr intact. | |
551 | */ | |
552 | int get_compat_sigevent(struct sigevent *event, | |
553 | const struct compat_sigevent __user *u_event) | |
554 | { | |
51410d3c | 555 | memset(event, 0, sizeof(*event)); |
1da177e4 LT |
556 | return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) || |
557 | __get_user(event->sigev_value.sival_int, | |
558 | &u_event->sigev_value.sival_int) || | |
559 | __get_user(event->sigev_signo, &u_event->sigev_signo) || | |
560 | __get_user(event->sigev_notify, &u_event->sigev_notify) || | |
561 | __get_user(event->sigev_notify_thread_id, | |
562 | &u_event->sigev_notify_thread_id)) | |
563 | ? -EFAULT : 0; | |
564 | } | |
565 | ||
5fa3839a | 566 | long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask, |
1da177e4 LT |
567 | unsigned long bitmap_size) |
568 | { | |
569 | int i, j; | |
570 | unsigned long m; | |
571 | compat_ulong_t um; | |
572 | unsigned long nr_compat_longs; | |
573 | ||
574 | /* align bitmap up to nearest compat_long_t boundary */ | |
575 | bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); | |
576 | ||
577 | if (!access_ok(VERIFY_READ, umask, bitmap_size / 8)) | |
578 | return -EFAULT; | |
579 | ||
580 | nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); | |
581 | ||
582 | for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) { | |
583 | m = 0; | |
584 | ||
585 | for (j = 0; j < sizeof(m)/sizeof(um); j++) { | |
586 | /* | |
587 | * We dont want to read past the end of the userspace | |
588 | * bitmap. We must however ensure the end of the | |
589 | * kernel bitmap is zeroed. | |
590 | */ | |
9b7b819c HD |
591 | if (nr_compat_longs) { |
592 | nr_compat_longs--; | |
1da177e4 LT |
593 | if (__get_user(um, umask)) |
594 | return -EFAULT; | |
595 | } else { | |
596 | um = 0; | |
597 | } | |
598 | ||
599 | umask++; | |
600 | m |= (long)um << (j * BITS_PER_COMPAT_LONG); | |
601 | } | |
602 | *mask++ = m; | |
603 | } | |
604 | ||
605 | return 0; | |
606 | } | |
607 | ||
608 | long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask, | |
609 | unsigned long bitmap_size) | |
610 | { | |
611 | int i, j; | |
612 | unsigned long m; | |
613 | compat_ulong_t um; | |
614 | unsigned long nr_compat_longs; | |
615 | ||
616 | /* align bitmap up to nearest compat_long_t boundary */ | |
617 | bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); | |
618 | ||
619 | if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8)) | |
620 | return -EFAULT; | |
621 | ||
622 | nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); | |
623 | ||
624 | for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) { | |
625 | m = *mask++; | |
626 | ||
627 | for (j = 0; j < sizeof(m)/sizeof(um); j++) { | |
628 | um = m; | |
629 | ||
630 | /* | |
631 | * We dont want to write past the end of the userspace | |
632 | * bitmap. | |
633 | */ | |
9b7b819c HD |
634 | if (nr_compat_longs) { |
635 | nr_compat_longs--; | |
1da177e4 LT |
636 | if (__put_user(um, umask)) |
637 | return -EFAULT; | |
638 | } | |
639 | ||
640 | umask++; | |
641 | m >>= 4*sizeof(um); | |
642 | m >>= 4*sizeof(um); | |
643 | } | |
644 | } | |
645 | ||
646 | return 0; | |
647 | } | |
648 | ||
649 | void | |
322a56cb | 650 | sigset_from_compat(sigset_t *set, const compat_sigset_t *compat) |
1da177e4 LT |
651 | { |
652 | switch (_NSIG_WORDS) { | |
1da177e4 LT |
653 | case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 ); |
654 | case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 ); | |
655 | case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 ); | |
656 | case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 ); | |
1da177e4 LT |
657 | } |
658 | } | |
1dda606c | 659 | EXPORT_SYMBOL_GPL(sigset_from_compat); |
1da177e4 | 660 | |
322a56cb AV |
661 | void |
662 | sigset_to_compat(compat_sigset_t *compat, const sigset_t *set) | |
663 | { | |
664 | switch (_NSIG_WORDS) { | |
665 | case 4: compat->sig[7] = (set->sig[3] >> 32); compat->sig[6] = set->sig[3]; | |
666 | case 3: compat->sig[5] = (set->sig[2] >> 32); compat->sig[4] = set->sig[2]; | |
667 | case 2: compat->sig[3] = (set->sig[1] >> 32); compat->sig[2] = set->sig[1]; | |
668 | case 1: compat->sig[1] = (set->sig[0] >> 32); compat->sig[0] = set->sig[0]; | |
669 | } | |
670 | } | |
671 | ||
28d27f2d AV |
672 | COMPAT_SYSCALL_DEFINE4(rt_sigtimedwait, compat_sigset_t __user *, uthese, |
673 | struct compat_siginfo __user *, uinfo, | |
674 | struct compat_timespec __user *, uts, compat_size_t, sigsetsize) | |
1da177e4 LT |
675 | { |
676 | compat_sigset_t s32; | |
677 | sigset_t s; | |
1da177e4 LT |
678 | struct timespec t; |
679 | siginfo_t info; | |
943df148 | 680 | long ret; |
1da177e4 LT |
681 | |
682 | if (sigsetsize != sizeof(sigset_t)) | |
683 | return -EINVAL; | |
684 | ||
685 | if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t))) | |
686 | return -EFAULT; | |
687 | sigset_from_compat(&s, &s32); | |
1da177e4 LT |
688 | |
689 | if (uts) { | |
b2ddedcd | 690 | if (compat_get_timespec(&t, uts)) |
1da177e4 | 691 | return -EFAULT; |
1da177e4 LT |
692 | } |
693 | ||
943df148 | 694 | ret = do_sigtimedwait(&s, &info, uts ? &t : NULL); |
1da177e4 | 695 | |
943df148 ON |
696 | if (ret > 0 && uinfo) { |
697 | if (copy_siginfo_to_user32(uinfo, &info)) | |
698 | ret = -EFAULT; | |
1da177e4 | 699 | } |
943df148 | 700 | |
1da177e4 | 701 | return ret; |
62ab4505 TG |
702 | } |
703 | ||
1b2db9fb | 704 | #ifdef CONFIG_NUMA |
2f2728f6 HC |
705 | COMPAT_SYSCALL_DEFINE6(move_pages, pid_t, pid, compat_ulong_t, nr_pages, |
706 | compat_uptr_t __user *, pages32, | |
707 | const int __user *, nodes, | |
708 | int __user *, status, | |
709 | int, flags) | |
1b2db9fb CL |
710 | { |
711 | const void __user * __user *pages; | |
712 | int i; | |
713 | ||
714 | pages = compat_alloc_user_space(nr_pages * sizeof(void *)); | |
715 | for (i = 0; i < nr_pages; i++) { | |
716 | compat_uptr_t p; | |
717 | ||
9216dfad | 718 | if (get_user(p, pages32 + i) || |
1b2db9fb CL |
719 | put_user(compat_ptr(p), pages + i)) |
720 | return -EFAULT; | |
721 | } | |
722 | return sys_move_pages(pid, nr_pages, pages, nodes, status, flags); | |
723 | } | |
3fd59397 | 724 | |
62a6fa97 HC |
725 | COMPAT_SYSCALL_DEFINE4(migrate_pages, compat_pid_t, pid, |
726 | compat_ulong_t, maxnode, | |
727 | const compat_ulong_t __user *, old_nodes, | |
728 | const compat_ulong_t __user *, new_nodes) | |
3fd59397 SR |
729 | { |
730 | unsigned long __user *old = NULL; | |
731 | unsigned long __user *new = NULL; | |
732 | nodemask_t tmp_mask; | |
733 | unsigned long nr_bits; | |
734 | unsigned long size; | |
735 | ||
736 | nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES); | |
737 | size = ALIGN(nr_bits, BITS_PER_LONG) / 8; | |
738 | if (old_nodes) { | |
739 | if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits)) | |
740 | return -EFAULT; | |
741 | old = compat_alloc_user_space(new_nodes ? size * 2 : size); | |
742 | if (new_nodes) | |
743 | new = old + size / sizeof(unsigned long); | |
744 | if (copy_to_user(old, nodes_addr(tmp_mask), size)) | |
745 | return -EFAULT; | |
746 | } | |
747 | if (new_nodes) { | |
748 | if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits)) | |
749 | return -EFAULT; | |
750 | if (new == NULL) | |
751 | new = compat_alloc_user_space(size); | |
752 | if (copy_to_user(new, nodes_addr(tmp_mask), size)) | |
753 | return -EFAULT; | |
754 | } | |
755 | return sys_migrate_pages(pid, nr_bits + 1, old, new); | |
756 | } | |
1b2db9fb | 757 | #endif |
d4d23add | 758 | |
6883da8c AV |
759 | COMPAT_SYSCALL_DEFINE2(sched_rr_get_interval, |
760 | compat_pid_t, pid, | |
761 | struct compat_timespec __user *, interval) | |
0ad50c38 CM |
762 | { |
763 | struct timespec t; | |
764 | int ret; | |
765 | mm_segment_t old_fs = get_fs(); | |
766 | ||
767 | set_fs(KERNEL_DS); | |
768 | ret = sys_sched_rr_get_interval(pid, (struct timespec __user *)&t); | |
769 | set_fs(old_fs); | |
81993e81 | 770 | if (compat_put_timespec(&t, interval)) |
0ad50c38 CM |
771 | return -EFAULT; |
772 | return ret; | |
773 | } | |
0ad50c38 | 774 | |
c41d68a5 PA |
775 | /* |
776 | * Allocate user-space memory for the duration of a single system call, | |
777 | * in order to marshall parameters inside a compat thunk. | |
778 | */ | |
779 | void __user *compat_alloc_user_space(unsigned long len) | |
780 | { | |
781 | void __user *ptr; | |
782 | ||
783 | /* If len would occupy more than half of the entire compat space... */ | |
784 | if (unlikely(len > (((compat_uptr_t)~0) >> 1))) | |
785 | return NULL; | |
786 | ||
787 | ptr = arch_compat_alloc_user_space(len); | |
788 | ||
789 | if (unlikely(!access_ok(VERIFY_WRITE, ptr, len))) | |
790 | return NULL; | |
791 | ||
792 | return ptr; | |
793 | } | |
794 | EXPORT_SYMBOL_GPL(compat_alloc_user_space); |