Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <linux/syscalls.h> |
| 21 | #include <linux/unistd.h> |
| 22 | #include <linux/security.h> |
Stephen Rothwell | 3158e94 | 2006-03-26 01:37:29 -0800 | [diff] [blame] | 23 | #include <linux/timex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | |
| 25 | #include <asm/uaccess.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | |
| 27 | int get_compat_timespec(struct timespec *ts, const struct compat_timespec __user *cts) |
| 28 | { |
| 29 | return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) || |
| 30 | __get_user(ts->tv_sec, &cts->tv_sec) || |
| 31 | __get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0; |
| 32 | } |
| 33 | |
| 34 | int put_compat_timespec(const struct timespec *ts, struct compat_timespec __user *cts) |
| 35 | { |
| 36 | return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) || |
| 37 | __put_user(ts->tv_sec, &cts->tv_sec) || |
| 38 | __put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0; |
| 39 | } |
| 40 | |
| 41 | static long compat_nanosleep_restart(struct restart_block *restart) |
| 42 | { |
| 43 | unsigned long expire = restart->arg0, now = jiffies; |
| 44 | struct compat_timespec __user *rmtp; |
| 45 | |
| 46 | /* Did it expire while we handled signals? */ |
| 47 | if (!time_after(expire, now)) |
| 48 | return 0; |
| 49 | |
Nishanth Aravamudan | 75bcc8c | 2005-09-10 00:27:24 -0700 | [diff] [blame] | 50 | expire = schedule_timeout_interruptible(expire - now); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | if (expire == 0) |
| 52 | return 0; |
| 53 | |
| 54 | rmtp = (struct compat_timespec __user *)restart->arg1; |
| 55 | if (rmtp) { |
| 56 | struct compat_timespec ct; |
| 57 | struct timespec t; |
| 58 | |
| 59 | jiffies_to_timespec(expire, &t); |
| 60 | ct.tv_sec = t.tv_sec; |
| 61 | ct.tv_nsec = t.tv_nsec; |
| 62 | if (copy_to_user(rmtp, &ct, sizeof(ct))) |
| 63 | return -EFAULT; |
| 64 | } |
| 65 | /* The 'restart' block is already filled in */ |
| 66 | return -ERESTART_RESTARTBLOCK; |
| 67 | } |
| 68 | |
| 69 | asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp, |
| 70 | struct compat_timespec __user *rmtp) |
| 71 | { |
| 72 | struct timespec t; |
| 73 | struct restart_block *restart; |
| 74 | unsigned long expire; |
| 75 | |
| 76 | if (get_compat_timespec(&t, rqtp)) |
| 77 | return -EFAULT; |
| 78 | |
| 79 | if ((t.tv_nsec >= 1000000000L) || (t.tv_nsec < 0) || (t.tv_sec < 0)) |
| 80 | return -EINVAL; |
| 81 | |
| 82 | expire = timespec_to_jiffies(&t) + (t.tv_sec || t.tv_nsec); |
Nishanth Aravamudan | 75bcc8c | 2005-09-10 00:27:24 -0700 | [diff] [blame] | 83 | expire = schedule_timeout_interruptible(expire); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | if (expire == 0) |
| 85 | return 0; |
| 86 | |
| 87 | if (rmtp) { |
| 88 | jiffies_to_timespec(expire, &t); |
| 89 | if (put_compat_timespec(&t, rmtp)) |
| 90 | return -EFAULT; |
| 91 | } |
| 92 | restart = ¤t_thread_info()->restart_block; |
| 93 | restart->fn = compat_nanosleep_restart; |
| 94 | restart->arg0 = jiffies + expire; |
| 95 | restart->arg1 = (unsigned long) rmtp; |
| 96 | return -ERESTART_RESTARTBLOCK; |
| 97 | } |
| 98 | |
| 99 | static inline long get_compat_itimerval(struct itimerval *o, |
| 100 | struct compat_itimerval __user *i) |
| 101 | { |
| 102 | return (!access_ok(VERIFY_READ, i, sizeof(*i)) || |
| 103 | (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) | |
| 104 | __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) | |
| 105 | __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) | |
| 106 | __get_user(o->it_value.tv_usec, &i->it_value.tv_usec))); |
| 107 | } |
| 108 | |
| 109 | static inline long put_compat_itimerval(struct compat_itimerval __user *o, |
| 110 | struct itimerval *i) |
| 111 | { |
| 112 | return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) || |
| 113 | (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) | |
| 114 | __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) | |
| 115 | __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) | |
| 116 | __put_user(i->it_value.tv_usec, &o->it_value.tv_usec))); |
| 117 | } |
| 118 | |
| 119 | asmlinkage long compat_sys_getitimer(int which, |
| 120 | struct compat_itimerval __user *it) |
| 121 | { |
| 122 | struct itimerval kit; |
| 123 | int error; |
| 124 | |
| 125 | error = do_getitimer(which, &kit); |
| 126 | if (!error && put_compat_itimerval(it, &kit)) |
| 127 | error = -EFAULT; |
| 128 | return error; |
| 129 | } |
| 130 | |
| 131 | asmlinkage long compat_sys_setitimer(int which, |
| 132 | struct compat_itimerval __user *in, |
| 133 | struct compat_itimerval __user *out) |
| 134 | { |
| 135 | struct itimerval kin, kout; |
| 136 | int error; |
| 137 | |
| 138 | if (in) { |
| 139 | if (get_compat_itimerval(&kin, in)) |
| 140 | return -EFAULT; |
| 141 | } else |
| 142 | memset(&kin, 0, sizeof(kin)); |
| 143 | |
| 144 | error = do_setitimer(which, &kin, out ? &kout : NULL); |
| 145 | if (error || !out) |
| 146 | return error; |
| 147 | if (put_compat_itimerval(out, &kout)) |
| 148 | return -EFAULT; |
| 149 | return 0; |
| 150 | } |
| 151 | |
| 152 | asmlinkage long compat_sys_times(struct compat_tms __user *tbuf) |
| 153 | { |
| 154 | /* |
| 155 | * In the SMP world we might just be unlucky and have one of |
| 156 | * the times increment as we use it. Since the value is an |
| 157 | * atomically safe type this is just fine. Conceptually its |
| 158 | * as if the syscall took an instant longer to occur. |
| 159 | */ |
| 160 | if (tbuf) { |
| 161 | struct compat_tms tmp; |
| 162 | struct task_struct *tsk = current; |
| 163 | struct task_struct *t; |
| 164 | cputime_t utime, stime, cutime, cstime; |
| 165 | |
| 166 | read_lock(&tasklist_lock); |
| 167 | utime = tsk->signal->utime; |
| 168 | stime = tsk->signal->stime; |
| 169 | t = tsk; |
| 170 | do { |
| 171 | utime = cputime_add(utime, t->utime); |
| 172 | stime = cputime_add(stime, t->stime); |
| 173 | t = next_thread(t); |
| 174 | } while (t != tsk); |
| 175 | |
| 176 | /* |
| 177 | * While we have tasklist_lock read-locked, no dying thread |
| 178 | * can be updating current->signal->[us]time. Instead, |
| 179 | * we got their counts included in the live thread loop. |
| 180 | * However, another thread can come in right now and |
| 181 | * do a wait call that updates current->signal->c[us]time. |
| 182 | * To make sure we always see that pair updated atomically, |
| 183 | * we take the siglock around fetching them. |
| 184 | */ |
| 185 | spin_lock_irq(&tsk->sighand->siglock); |
| 186 | cutime = tsk->signal->cutime; |
| 187 | cstime = tsk->signal->cstime; |
| 188 | spin_unlock_irq(&tsk->sighand->siglock); |
| 189 | read_unlock(&tasklist_lock); |
| 190 | |
| 191 | tmp.tms_utime = compat_jiffies_to_clock_t(cputime_to_jiffies(utime)); |
| 192 | tmp.tms_stime = compat_jiffies_to_clock_t(cputime_to_jiffies(stime)); |
| 193 | tmp.tms_cutime = compat_jiffies_to_clock_t(cputime_to_jiffies(cutime)); |
| 194 | tmp.tms_cstime = compat_jiffies_to_clock_t(cputime_to_jiffies(cstime)); |
| 195 | if (copy_to_user(tbuf, &tmp, sizeof(tmp))) |
| 196 | return -EFAULT; |
| 197 | } |
| 198 | return compat_jiffies_to_clock_t(jiffies); |
| 199 | } |
| 200 | |
| 201 | /* |
| 202 | * Assumption: old_sigset_t and compat_old_sigset_t are both |
| 203 | * types that can be passed to put_user()/get_user(). |
| 204 | */ |
| 205 | |
| 206 | asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set) |
| 207 | { |
| 208 | old_sigset_t s; |
| 209 | long ret; |
| 210 | mm_segment_t old_fs = get_fs(); |
| 211 | |
| 212 | set_fs(KERNEL_DS); |
| 213 | ret = sys_sigpending((old_sigset_t __user *) &s); |
| 214 | set_fs(old_fs); |
| 215 | if (ret == 0) |
| 216 | ret = put_user(s, set); |
| 217 | return ret; |
| 218 | } |
| 219 | |
| 220 | asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *set, |
| 221 | compat_old_sigset_t __user *oset) |
| 222 | { |
| 223 | old_sigset_t s; |
| 224 | long ret; |
| 225 | mm_segment_t old_fs; |
| 226 | |
| 227 | if (set && get_user(s, set)) |
| 228 | return -EFAULT; |
| 229 | old_fs = get_fs(); |
| 230 | set_fs(KERNEL_DS); |
| 231 | ret = sys_sigprocmask(how, |
| 232 | set ? (old_sigset_t __user *) &s : NULL, |
| 233 | oset ? (old_sigset_t __user *) &s : NULL); |
| 234 | set_fs(old_fs); |
| 235 | if (ret == 0) |
| 236 | if (oset) |
| 237 | ret = put_user(s, oset); |
| 238 | return ret; |
| 239 | } |
| 240 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | asmlinkage long compat_sys_setrlimit(unsigned int resource, |
| 242 | struct compat_rlimit __user *rlim) |
| 243 | { |
| 244 | struct rlimit r; |
| 245 | int ret; |
| 246 | mm_segment_t old_fs = get_fs (); |
| 247 | |
| 248 | if (resource >= RLIM_NLIMITS) |
| 249 | return -EINVAL; |
| 250 | |
| 251 | if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) || |
| 252 | __get_user(r.rlim_cur, &rlim->rlim_cur) || |
| 253 | __get_user(r.rlim_max, &rlim->rlim_max)) |
| 254 | return -EFAULT; |
| 255 | |
| 256 | if (r.rlim_cur == COMPAT_RLIM_INFINITY) |
| 257 | r.rlim_cur = RLIM_INFINITY; |
| 258 | if (r.rlim_max == COMPAT_RLIM_INFINITY) |
| 259 | r.rlim_max = RLIM_INFINITY; |
| 260 | set_fs(KERNEL_DS); |
| 261 | ret = sys_setrlimit(resource, (struct rlimit __user *) &r); |
| 262 | set_fs(old_fs); |
| 263 | return ret; |
| 264 | } |
| 265 | |
| 266 | #ifdef COMPAT_RLIM_OLD_INFINITY |
| 267 | |
| 268 | asmlinkage long compat_sys_old_getrlimit(unsigned int resource, |
| 269 | struct compat_rlimit __user *rlim) |
| 270 | { |
| 271 | struct rlimit r; |
| 272 | int ret; |
| 273 | mm_segment_t old_fs = get_fs(); |
| 274 | |
| 275 | set_fs(KERNEL_DS); |
| 276 | ret = sys_old_getrlimit(resource, &r); |
| 277 | set_fs(old_fs); |
| 278 | |
| 279 | if (!ret) { |
| 280 | if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY) |
| 281 | r.rlim_cur = COMPAT_RLIM_INFINITY; |
| 282 | if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY) |
| 283 | r.rlim_max = COMPAT_RLIM_INFINITY; |
| 284 | |
| 285 | if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) || |
| 286 | __put_user(r.rlim_cur, &rlim->rlim_cur) || |
| 287 | __put_user(r.rlim_max, &rlim->rlim_max)) |
| 288 | return -EFAULT; |
| 289 | } |
| 290 | return ret; |
| 291 | } |
| 292 | |
| 293 | #endif |
| 294 | |
| 295 | asmlinkage long compat_sys_getrlimit (unsigned int resource, |
| 296 | struct compat_rlimit __user *rlim) |
| 297 | { |
| 298 | struct rlimit r; |
| 299 | int ret; |
| 300 | mm_segment_t old_fs = get_fs(); |
| 301 | |
| 302 | set_fs(KERNEL_DS); |
| 303 | ret = sys_getrlimit(resource, (struct rlimit __user *) &r); |
| 304 | set_fs(old_fs); |
| 305 | if (!ret) { |
| 306 | if (r.rlim_cur > COMPAT_RLIM_INFINITY) |
| 307 | r.rlim_cur = COMPAT_RLIM_INFINITY; |
| 308 | if (r.rlim_max > COMPAT_RLIM_INFINITY) |
| 309 | r.rlim_max = COMPAT_RLIM_INFINITY; |
| 310 | |
| 311 | if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) || |
| 312 | __put_user(r.rlim_cur, &rlim->rlim_cur) || |
| 313 | __put_user(r.rlim_max, &rlim->rlim_max)) |
| 314 | return -EFAULT; |
| 315 | } |
| 316 | return ret; |
| 317 | } |
| 318 | |
| 319 | int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru) |
| 320 | { |
| 321 | if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) || |
| 322 | __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) || |
| 323 | __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) || |
| 324 | __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) || |
| 325 | __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) || |
| 326 | __put_user(r->ru_maxrss, &ru->ru_maxrss) || |
| 327 | __put_user(r->ru_ixrss, &ru->ru_ixrss) || |
| 328 | __put_user(r->ru_idrss, &ru->ru_idrss) || |
| 329 | __put_user(r->ru_isrss, &ru->ru_isrss) || |
| 330 | __put_user(r->ru_minflt, &ru->ru_minflt) || |
| 331 | __put_user(r->ru_majflt, &ru->ru_majflt) || |
| 332 | __put_user(r->ru_nswap, &ru->ru_nswap) || |
| 333 | __put_user(r->ru_inblock, &ru->ru_inblock) || |
| 334 | __put_user(r->ru_oublock, &ru->ru_oublock) || |
| 335 | __put_user(r->ru_msgsnd, &ru->ru_msgsnd) || |
| 336 | __put_user(r->ru_msgrcv, &ru->ru_msgrcv) || |
| 337 | __put_user(r->ru_nsignals, &ru->ru_nsignals) || |
| 338 | __put_user(r->ru_nvcsw, &ru->ru_nvcsw) || |
| 339 | __put_user(r->ru_nivcsw, &ru->ru_nivcsw)) |
| 340 | return -EFAULT; |
| 341 | return 0; |
| 342 | } |
| 343 | |
| 344 | asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru) |
| 345 | { |
| 346 | struct rusage r; |
| 347 | int ret; |
| 348 | mm_segment_t old_fs = get_fs(); |
| 349 | |
| 350 | set_fs(KERNEL_DS); |
| 351 | ret = sys_getrusage(who, (struct rusage __user *) &r); |
| 352 | set_fs(old_fs); |
| 353 | |
| 354 | if (ret) |
| 355 | return ret; |
| 356 | |
| 357 | if (put_compat_rusage(&r, ru)) |
| 358 | return -EFAULT; |
| 359 | |
| 360 | return 0; |
| 361 | } |
| 362 | |
| 363 | asmlinkage long |
| 364 | compat_sys_wait4(compat_pid_t pid, compat_uint_t __user *stat_addr, int options, |
| 365 | struct compat_rusage __user *ru) |
| 366 | { |
| 367 | if (!ru) { |
| 368 | return sys_wait4(pid, stat_addr, options, NULL); |
| 369 | } else { |
| 370 | struct rusage r; |
| 371 | int ret; |
| 372 | unsigned int status; |
| 373 | mm_segment_t old_fs = get_fs(); |
| 374 | |
| 375 | set_fs (KERNEL_DS); |
| 376 | ret = sys_wait4(pid, |
| 377 | (stat_addr ? |
| 378 | (unsigned int __user *) &status : NULL), |
| 379 | options, (struct rusage __user *) &r); |
| 380 | set_fs (old_fs); |
| 381 | |
| 382 | if (ret > 0) { |
| 383 | if (put_compat_rusage(&r, ru)) |
| 384 | return -EFAULT; |
| 385 | if (stat_addr && put_user(status, stat_addr)) |
| 386 | return -EFAULT; |
| 387 | } |
| 388 | return ret; |
| 389 | } |
| 390 | } |
| 391 | |
| 392 | asmlinkage long compat_sys_waitid(int which, compat_pid_t pid, |
| 393 | struct compat_siginfo __user *uinfo, int options, |
| 394 | struct compat_rusage __user *uru) |
| 395 | { |
| 396 | siginfo_t info; |
| 397 | struct rusage ru; |
| 398 | long ret; |
| 399 | mm_segment_t old_fs = get_fs(); |
| 400 | |
| 401 | memset(&info, 0, sizeof(info)); |
| 402 | |
| 403 | set_fs(KERNEL_DS); |
| 404 | ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options, |
| 405 | uru ? (struct rusage __user *)&ru : NULL); |
| 406 | set_fs(old_fs); |
| 407 | |
| 408 | if ((ret < 0) || (info.si_signo == 0)) |
| 409 | return ret; |
| 410 | |
| 411 | if (uru) { |
| 412 | ret = put_compat_rusage(&ru, uru); |
| 413 | if (ret) |
| 414 | return ret; |
| 415 | } |
| 416 | |
| 417 | BUG_ON(info.si_code & __SI_MASK); |
| 418 | info.si_code |= __SI_CHLD; |
| 419 | return copy_siginfo_to_user32(uinfo, &info); |
| 420 | } |
| 421 | |
| 422 | static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr, |
| 423 | unsigned len, cpumask_t *new_mask) |
| 424 | { |
| 425 | unsigned long *k; |
| 426 | |
| 427 | if (len < sizeof(cpumask_t)) |
| 428 | memset(new_mask, 0, sizeof(cpumask_t)); |
| 429 | else if (len > sizeof(cpumask_t)) |
| 430 | len = sizeof(cpumask_t); |
| 431 | |
| 432 | k = cpus_addr(*new_mask); |
| 433 | return compat_get_bitmap(k, user_mask_ptr, len * 8); |
| 434 | } |
| 435 | |
| 436 | asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid, |
| 437 | unsigned int len, |
| 438 | compat_ulong_t __user *user_mask_ptr) |
| 439 | { |
| 440 | cpumask_t new_mask; |
| 441 | int retval; |
| 442 | |
| 443 | retval = compat_get_user_cpu_mask(user_mask_ptr, len, &new_mask); |
| 444 | if (retval) |
| 445 | return retval; |
| 446 | |
| 447 | return sched_setaffinity(pid, new_mask); |
| 448 | } |
| 449 | |
| 450 | asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len, |
| 451 | compat_ulong_t __user *user_mask_ptr) |
| 452 | { |
| 453 | int ret; |
| 454 | cpumask_t mask; |
| 455 | unsigned long *k; |
| 456 | unsigned int min_length = sizeof(cpumask_t); |
| 457 | |
| 458 | if (NR_CPUS <= BITS_PER_COMPAT_LONG) |
| 459 | min_length = sizeof(compat_ulong_t); |
| 460 | |
| 461 | if (len < min_length) |
| 462 | return -EINVAL; |
| 463 | |
| 464 | ret = sched_getaffinity(pid, &mask); |
| 465 | if (ret < 0) |
| 466 | return ret; |
| 467 | |
| 468 | k = cpus_addr(mask); |
| 469 | ret = compat_put_bitmap(user_mask_ptr, k, min_length * 8); |
| 470 | if (ret) |
| 471 | return ret; |
| 472 | |
| 473 | return min_length; |
| 474 | } |
| 475 | |
| 476 | static int get_compat_itimerspec(struct itimerspec *dst, |
| 477 | struct compat_itimerspec __user *src) |
| 478 | { |
| 479 | if (get_compat_timespec(&dst->it_interval, &src->it_interval) || |
| 480 | get_compat_timespec(&dst->it_value, &src->it_value)) |
| 481 | return -EFAULT; |
| 482 | return 0; |
| 483 | } |
| 484 | |
| 485 | static int put_compat_itimerspec(struct compat_itimerspec __user *dst, |
| 486 | struct itimerspec *src) |
| 487 | { |
| 488 | if (put_compat_timespec(&src->it_interval, &dst->it_interval) || |
| 489 | put_compat_timespec(&src->it_value, &dst->it_value)) |
| 490 | return -EFAULT; |
| 491 | return 0; |
| 492 | } |
| 493 | |
Christoph Hellwig | 3a0f69d | 2006-01-09 20:52:08 -0800 | [diff] [blame] | 494 | long compat_sys_timer_create(clockid_t which_clock, |
| 495 | struct compat_sigevent __user *timer_event_spec, |
| 496 | timer_t __user *created_timer_id) |
| 497 | { |
| 498 | struct sigevent __user *event = NULL; |
| 499 | |
| 500 | if (timer_event_spec) { |
| 501 | struct sigevent kevent; |
| 502 | |
| 503 | event = compat_alloc_user_space(sizeof(*event)); |
| 504 | if (get_compat_sigevent(&kevent, timer_event_spec) || |
| 505 | copy_to_user(event, &kevent, sizeof(*event))) |
| 506 | return -EFAULT; |
| 507 | } |
| 508 | |
| 509 | return sys_timer_create(which_clock, event, created_timer_id); |
| 510 | } |
| 511 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | long compat_sys_timer_settime(timer_t timer_id, int flags, |
| 513 | struct compat_itimerspec __user *new, |
| 514 | struct compat_itimerspec __user *old) |
| 515 | { |
| 516 | long err; |
| 517 | mm_segment_t oldfs; |
| 518 | struct itimerspec newts, oldts; |
| 519 | |
| 520 | if (!new) |
| 521 | return -EINVAL; |
| 522 | if (get_compat_itimerspec(&newts, new)) |
| 523 | return -EFAULT; |
| 524 | oldfs = get_fs(); |
| 525 | set_fs(KERNEL_DS); |
| 526 | err = sys_timer_settime(timer_id, flags, |
| 527 | (struct itimerspec __user *) &newts, |
| 528 | (struct itimerspec __user *) &oldts); |
| 529 | set_fs(oldfs); |
| 530 | if (!err && old && put_compat_itimerspec(old, &oldts)) |
| 531 | return -EFAULT; |
| 532 | return err; |
| 533 | } |
| 534 | |
| 535 | long compat_sys_timer_gettime(timer_t timer_id, |
| 536 | struct compat_itimerspec __user *setting) |
| 537 | { |
| 538 | long err; |
| 539 | mm_segment_t oldfs; |
| 540 | struct itimerspec ts; |
| 541 | |
| 542 | oldfs = get_fs(); |
| 543 | set_fs(KERNEL_DS); |
| 544 | err = sys_timer_gettime(timer_id, |
| 545 | (struct itimerspec __user *) &ts); |
| 546 | set_fs(oldfs); |
| 547 | if (!err && put_compat_itimerspec(setting, &ts)) |
| 548 | return -EFAULT; |
| 549 | return err; |
| 550 | } |
| 551 | |
| 552 | long compat_sys_clock_settime(clockid_t which_clock, |
| 553 | struct compat_timespec __user *tp) |
| 554 | { |
| 555 | long err; |
| 556 | mm_segment_t oldfs; |
| 557 | struct timespec ts; |
| 558 | |
| 559 | if (get_compat_timespec(&ts, tp)) |
| 560 | return -EFAULT; |
| 561 | oldfs = get_fs(); |
| 562 | set_fs(KERNEL_DS); |
| 563 | err = sys_clock_settime(which_clock, |
| 564 | (struct timespec __user *) &ts); |
| 565 | set_fs(oldfs); |
| 566 | return err; |
| 567 | } |
| 568 | |
| 569 | long compat_sys_clock_gettime(clockid_t which_clock, |
| 570 | struct compat_timespec __user *tp) |
| 571 | { |
| 572 | long err; |
| 573 | mm_segment_t oldfs; |
| 574 | struct timespec ts; |
| 575 | |
| 576 | oldfs = get_fs(); |
| 577 | set_fs(KERNEL_DS); |
| 578 | err = sys_clock_gettime(which_clock, |
| 579 | (struct timespec __user *) &ts); |
| 580 | set_fs(oldfs); |
| 581 | if (!err && put_compat_timespec(&ts, tp)) |
| 582 | return -EFAULT; |
| 583 | return err; |
| 584 | } |
| 585 | |
| 586 | long compat_sys_clock_getres(clockid_t which_clock, |
| 587 | struct compat_timespec __user *tp) |
| 588 | { |
| 589 | long err; |
| 590 | mm_segment_t oldfs; |
| 591 | struct timespec ts; |
| 592 | |
| 593 | oldfs = get_fs(); |
| 594 | set_fs(KERNEL_DS); |
| 595 | err = sys_clock_getres(which_clock, |
| 596 | (struct timespec __user *) &ts); |
| 597 | set_fs(oldfs); |
| 598 | if (!err && tp && put_compat_timespec(&ts, tp)) |
| 599 | return -EFAULT; |
| 600 | return err; |
| 601 | } |
| 602 | |
| 603 | long compat_sys_clock_nanosleep(clockid_t which_clock, int flags, |
| 604 | struct compat_timespec __user *rqtp, |
| 605 | struct compat_timespec __user *rmtp) |
| 606 | { |
| 607 | long err; |
| 608 | mm_segment_t oldfs; |
| 609 | struct timespec in, out; |
| 610 | |
| 611 | if (get_compat_timespec(&in, rqtp)) |
| 612 | return -EFAULT; |
| 613 | |
| 614 | oldfs = get_fs(); |
| 615 | set_fs(KERNEL_DS); |
| 616 | err = sys_clock_nanosleep(which_clock, flags, |
| 617 | (struct timespec __user *) &in, |
| 618 | (struct timespec __user *) &out); |
| 619 | set_fs(oldfs); |
| 620 | if ((err == -ERESTART_RESTARTBLOCK) && rmtp && |
| 621 | put_compat_timespec(&out, rmtp)) |
| 622 | return -EFAULT; |
| 623 | return err; |
| 624 | } |
| 625 | |
| 626 | /* |
| 627 | * We currently only need the following fields from the sigevent |
| 628 | * structure: sigev_value, sigev_signo, sig_notify and (sometimes |
| 629 | * sigev_notify_thread_id). The others are handled in user mode. |
| 630 | * We also assume that copying sigev_value.sival_int is sufficient |
| 631 | * to keep all the bits of sigev_value.sival_ptr intact. |
| 632 | */ |
| 633 | int get_compat_sigevent(struct sigevent *event, |
| 634 | const struct compat_sigevent __user *u_event) |
| 635 | { |
David S. Miller | 51410d3 | 2005-04-16 15:24:01 -0700 | [diff] [blame] | 636 | memset(event, 0, sizeof(*event)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 637 | return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) || |
| 638 | __get_user(event->sigev_value.sival_int, |
| 639 | &u_event->sigev_value.sival_int) || |
| 640 | __get_user(event->sigev_signo, &u_event->sigev_signo) || |
| 641 | __get_user(event->sigev_notify, &u_event->sigev_notify) || |
| 642 | __get_user(event->sigev_notify_thread_id, |
| 643 | &u_event->sigev_notify_thread_id)) |
| 644 | ? -EFAULT : 0; |
| 645 | } |
| 646 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 647 | long compat_get_bitmap(unsigned long *mask, compat_ulong_t __user *umask, |
| 648 | unsigned long bitmap_size) |
| 649 | { |
| 650 | int i, j; |
| 651 | unsigned long m; |
| 652 | compat_ulong_t um; |
| 653 | unsigned long nr_compat_longs; |
| 654 | |
| 655 | /* align bitmap up to nearest compat_long_t boundary */ |
| 656 | bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); |
| 657 | |
| 658 | if (!access_ok(VERIFY_READ, umask, bitmap_size / 8)) |
| 659 | return -EFAULT; |
| 660 | |
| 661 | nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); |
| 662 | |
| 663 | for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) { |
| 664 | m = 0; |
| 665 | |
| 666 | for (j = 0; j < sizeof(m)/sizeof(um); j++) { |
| 667 | /* |
| 668 | * We dont want to read past the end of the userspace |
| 669 | * bitmap. We must however ensure the end of the |
| 670 | * kernel bitmap is zeroed. |
| 671 | */ |
| 672 | if (nr_compat_longs-- > 0) { |
| 673 | if (__get_user(um, umask)) |
| 674 | return -EFAULT; |
| 675 | } else { |
| 676 | um = 0; |
| 677 | } |
| 678 | |
| 679 | umask++; |
| 680 | m |= (long)um << (j * BITS_PER_COMPAT_LONG); |
| 681 | } |
| 682 | *mask++ = m; |
| 683 | } |
| 684 | |
| 685 | return 0; |
| 686 | } |
| 687 | |
| 688 | long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask, |
| 689 | unsigned long bitmap_size) |
| 690 | { |
| 691 | int i, j; |
| 692 | unsigned long m; |
| 693 | compat_ulong_t um; |
| 694 | unsigned long nr_compat_longs; |
| 695 | |
| 696 | /* align bitmap up to nearest compat_long_t boundary */ |
| 697 | bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); |
| 698 | |
| 699 | if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8)) |
| 700 | return -EFAULT; |
| 701 | |
| 702 | nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); |
| 703 | |
| 704 | for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) { |
| 705 | m = *mask++; |
| 706 | |
| 707 | for (j = 0; j < sizeof(m)/sizeof(um); j++) { |
| 708 | um = m; |
| 709 | |
| 710 | /* |
| 711 | * We dont want to write past the end of the userspace |
| 712 | * bitmap. |
| 713 | */ |
| 714 | if (nr_compat_longs-- > 0) { |
| 715 | if (__put_user(um, umask)) |
| 716 | return -EFAULT; |
| 717 | } |
| 718 | |
| 719 | umask++; |
| 720 | m >>= 4*sizeof(um); |
| 721 | m >>= 4*sizeof(um); |
| 722 | } |
| 723 | } |
| 724 | |
| 725 | return 0; |
| 726 | } |
| 727 | |
| 728 | void |
| 729 | sigset_from_compat (sigset_t *set, compat_sigset_t *compat) |
| 730 | { |
| 731 | switch (_NSIG_WORDS) { |
| 732 | #if defined (__COMPAT_ENDIAN_SWAP__) |
| 733 | case 4: set->sig[3] = compat->sig[7] | (((long)compat->sig[6]) << 32 ); |
| 734 | case 3: set->sig[2] = compat->sig[5] | (((long)compat->sig[4]) << 32 ); |
| 735 | case 2: set->sig[1] = compat->sig[3] | (((long)compat->sig[2]) << 32 ); |
| 736 | case 1: set->sig[0] = compat->sig[1] | (((long)compat->sig[0]) << 32 ); |
| 737 | #else |
| 738 | case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 ); |
| 739 | case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 ); |
| 740 | case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 ); |
| 741 | case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 ); |
| 742 | #endif |
| 743 | } |
| 744 | } |
| 745 | |
| 746 | asmlinkage long |
| 747 | compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese, |
| 748 | struct compat_siginfo __user *uinfo, |
| 749 | struct compat_timespec __user *uts, compat_size_t sigsetsize) |
| 750 | { |
| 751 | compat_sigset_t s32; |
| 752 | sigset_t s; |
| 753 | int sig; |
| 754 | struct timespec t; |
| 755 | siginfo_t info; |
| 756 | long ret, timeout = 0; |
| 757 | |
| 758 | if (sigsetsize != sizeof(sigset_t)) |
| 759 | return -EINVAL; |
| 760 | |
| 761 | if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t))) |
| 762 | return -EFAULT; |
| 763 | sigset_from_compat(&s, &s32); |
| 764 | sigdelsetmask(&s,sigmask(SIGKILL)|sigmask(SIGSTOP)); |
| 765 | signotset(&s); |
| 766 | |
| 767 | if (uts) { |
| 768 | if (get_compat_timespec (&t, uts)) |
| 769 | return -EFAULT; |
| 770 | if (t.tv_nsec >= 1000000000L || t.tv_nsec < 0 |
| 771 | || t.tv_sec < 0) |
| 772 | return -EINVAL; |
| 773 | } |
| 774 | |
| 775 | spin_lock_irq(¤t->sighand->siglock); |
| 776 | sig = dequeue_signal(current, &s, &info); |
| 777 | if (!sig) { |
| 778 | timeout = MAX_SCHEDULE_TIMEOUT; |
| 779 | if (uts) |
| 780 | timeout = timespec_to_jiffies(&t) |
| 781 | +(t.tv_sec || t.tv_nsec); |
| 782 | if (timeout) { |
| 783 | current->real_blocked = current->blocked; |
| 784 | sigandsets(¤t->blocked, ¤t->blocked, &s); |
| 785 | |
| 786 | recalc_sigpending(); |
| 787 | spin_unlock_irq(¤t->sighand->siglock); |
| 788 | |
Nishanth Aravamudan | 75bcc8c | 2005-09-10 00:27:24 -0700 | [diff] [blame] | 789 | timeout = schedule_timeout_interruptible(timeout); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 790 | |
| 791 | spin_lock_irq(¤t->sighand->siglock); |
| 792 | sig = dequeue_signal(current, &s, &info); |
| 793 | current->blocked = current->real_blocked; |
| 794 | siginitset(¤t->real_blocked, 0); |
| 795 | recalc_sigpending(); |
| 796 | } |
| 797 | } |
| 798 | spin_unlock_irq(¤t->sighand->siglock); |
| 799 | |
| 800 | if (sig) { |
| 801 | ret = sig; |
| 802 | if (uinfo) { |
| 803 | if (copy_siginfo_to_user32(uinfo, &info)) |
| 804 | ret = -EFAULT; |
| 805 | } |
| 806 | }else { |
| 807 | ret = timeout?-EINTR:-EAGAIN; |
| 808 | } |
| 809 | return ret; |
| 810 | |
| 811 | } |
| 812 | |
| 813 | #ifdef __ARCH_WANT_COMPAT_SYS_TIME |
| 814 | |
| 815 | /* compat_time_t is a 32 bit "long" and needs to get converted. */ |
| 816 | |
| 817 | asmlinkage long compat_sys_time(compat_time_t __user * tloc) |
| 818 | { |
| 819 | compat_time_t i; |
| 820 | struct timeval tv; |
| 821 | |
| 822 | do_gettimeofday(&tv); |
| 823 | i = tv.tv_sec; |
| 824 | |
| 825 | if (tloc) { |
| 826 | if (put_user(i,tloc)) |
| 827 | i = -EFAULT; |
| 828 | } |
| 829 | return i; |
| 830 | } |
| 831 | |
| 832 | asmlinkage long compat_sys_stime(compat_time_t __user *tptr) |
| 833 | { |
| 834 | struct timespec tv; |
| 835 | int err; |
| 836 | |
| 837 | if (get_user(tv.tv_sec, tptr)) |
| 838 | return -EFAULT; |
| 839 | |
| 840 | tv.tv_nsec = 0; |
| 841 | |
| 842 | err = security_settime(&tv, NULL); |
| 843 | if (err) |
| 844 | return err; |
| 845 | |
| 846 | do_settimeofday(&tv); |
| 847 | return 0; |
| 848 | } |
| 849 | |
| 850 | #endif /* __ARCH_WANT_COMPAT_SYS_TIME */ |
David Woodhouse | 150256d | 2006-01-18 17:43:57 -0800 | [diff] [blame] | 851 | |
| 852 | #ifdef __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND |
| 853 | asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset, compat_size_t sigsetsize) |
| 854 | { |
| 855 | sigset_t newset; |
| 856 | compat_sigset_t newset32; |
| 857 | |
| 858 | /* XXX: Don't preclude handling different sized sigset_t's. */ |
| 859 | if (sigsetsize != sizeof(sigset_t)) |
| 860 | return -EINVAL; |
| 861 | |
| 862 | if (copy_from_user(&newset32, unewset, sizeof(compat_sigset_t))) |
| 863 | return -EFAULT; |
| 864 | sigset_from_compat(&newset, &newset32); |
| 865 | sigdelsetmask(&newset, sigmask(SIGKILL)|sigmask(SIGSTOP)); |
| 866 | |
| 867 | spin_lock_irq(¤t->sighand->siglock); |
| 868 | current->saved_sigmask = current->blocked; |
| 869 | current->blocked = newset; |
| 870 | recalc_sigpending(); |
| 871 | spin_unlock_irq(¤t->sighand->siglock); |
| 872 | |
| 873 | current->state = TASK_INTERRUPTIBLE; |
| 874 | schedule(); |
| 875 | set_thread_flag(TIF_RESTORE_SIGMASK); |
| 876 | return -ERESTARTNOHAND; |
| 877 | } |
| 878 | #endif /* __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND */ |
Stephen Rothwell | 3158e94 | 2006-03-26 01:37:29 -0800 | [diff] [blame] | 879 | |
| 880 | asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp) |
| 881 | { |
| 882 | struct timex txc; |
| 883 | int ret; |
| 884 | |
| 885 | memset(&txc, 0, sizeof(struct timex)); |
| 886 | |
| 887 | if (!access_ok(VERIFY_READ, utp, sizeof(struct compat_timex)) || |
| 888 | __get_user(txc.modes, &utp->modes) || |
| 889 | __get_user(txc.offset, &utp->offset) || |
| 890 | __get_user(txc.freq, &utp->freq) || |
| 891 | __get_user(txc.maxerror, &utp->maxerror) || |
| 892 | __get_user(txc.esterror, &utp->esterror) || |
| 893 | __get_user(txc.status, &utp->status) || |
| 894 | __get_user(txc.constant, &utp->constant) || |
| 895 | __get_user(txc.precision, &utp->precision) || |
| 896 | __get_user(txc.tolerance, &utp->tolerance) || |
| 897 | __get_user(txc.time.tv_sec, &utp->time.tv_sec) || |
| 898 | __get_user(txc.time.tv_usec, &utp->time.tv_usec) || |
| 899 | __get_user(txc.tick, &utp->tick) || |
| 900 | __get_user(txc.ppsfreq, &utp->ppsfreq) || |
| 901 | __get_user(txc.jitter, &utp->jitter) || |
| 902 | __get_user(txc.shift, &utp->shift) || |
| 903 | __get_user(txc.stabil, &utp->stabil) || |
| 904 | __get_user(txc.jitcnt, &utp->jitcnt) || |
| 905 | __get_user(txc.calcnt, &utp->calcnt) || |
| 906 | __get_user(txc.errcnt, &utp->errcnt) || |
| 907 | __get_user(txc.stbcnt, &utp->stbcnt)) |
| 908 | return -EFAULT; |
| 909 | |
| 910 | ret = do_adjtimex(&txc); |
| 911 | |
| 912 | if (!access_ok(VERIFY_WRITE, utp, sizeof(struct compat_timex)) || |
| 913 | __put_user(txc.modes, &utp->modes) || |
| 914 | __put_user(txc.offset, &utp->offset) || |
| 915 | __put_user(txc.freq, &utp->freq) || |
| 916 | __put_user(txc.maxerror, &utp->maxerror) || |
| 917 | __put_user(txc.esterror, &utp->esterror) || |
| 918 | __put_user(txc.status, &utp->status) || |
| 919 | __put_user(txc.constant, &utp->constant) || |
| 920 | __put_user(txc.precision, &utp->precision) || |
| 921 | __put_user(txc.tolerance, &utp->tolerance) || |
| 922 | __put_user(txc.time.tv_sec, &utp->time.tv_sec) || |
| 923 | __put_user(txc.time.tv_usec, &utp->time.tv_usec) || |
| 924 | __put_user(txc.tick, &utp->tick) || |
| 925 | __put_user(txc.ppsfreq, &utp->ppsfreq) || |
| 926 | __put_user(txc.jitter, &utp->jitter) || |
| 927 | __put_user(txc.shift, &utp->shift) || |
| 928 | __put_user(txc.stabil, &utp->stabil) || |
| 929 | __put_user(txc.jitcnt, &utp->jitcnt) || |
| 930 | __put_user(txc.calcnt, &utp->calcnt) || |
| 931 | __put_user(txc.errcnt, &utp->errcnt) || |
| 932 | __put_user(txc.stbcnt, &utp->stbcnt)) |
| 933 | ret = -EFAULT; |
| 934 | |
| 935 | return ret; |
| 936 | } |