1 /* $NetBSD: linux_misc_notalpha.c,v 1.104 2008/10/03 22:39:36 njoly Exp $ */ 2 3 /*- 4 * Copyright (c) 1995, 1998, 2008 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Frank van der Linden and Eric Haszlakiewicz; by Jason R. Thorpe 9 * of the Numerical Aerospace Simulation Facility, NASA Ames Research Center. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #include <sys/cdefs.h> 34 __KERNEL_RCSID(0, "$NetBSD: linux_misc_notalpha.c,v 1.104 2008/10/03 22:39:36 njoly Exp $"); 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/kernel.h> 39 #include <sys/mman.h> 40 #include <sys/mount.h> 41 #include <sys/malloc.h> 42 #include <sys/mbuf.h> 43 #include <sys/namei.h> 44 #include <sys/proc.h> 45 #include <sys/prot.h> 46 #include <sys/ptrace.h> 47 #include <sys/resource.h> 48 #include <sys/resourcevar.h> 49 #include <sys/time.h> 50 #include <sys/vfs_syscalls.h> 51 #include <sys/wait.h> 52 #include <sys/kauth.h> 53 54 #include <sys/syscallargs.h> 55 56 #include <compat/linux/common/linux_types.h> 57 #include <compat/linux/common/linux_fcntl.h> 58 #include <compat/linux/common/linux_misc.h> 59 #include <compat/linux/common/linux_mmap.h> 60 #include <compat/linux/common/linux_signal.h> 61 #include <compat/linux/common/linux_util.h> 62 #include <compat/linux/common/linux_ipc.h> 63 #include <compat/linux/common/linux_sem.h> 64 65 #include <compat/linux/linux_syscallargs.h> 66 67 /* 68 * This file contains routines which are used 69 * on every linux architechture except the Alpha. 70 */ 71 72 /* Used on: arm, i386, m68k, mips, ppc, sparc, sparc64 */ 73 /* Not used on: alpha */ 74 75 #ifdef DEBUG_LINUX 76 #define DPRINTF(a) uprintf a 77 #else 78 #define DPRINTF(a) 79 #endif 80 81 #ifndef COMPAT_LINUX32 82 #if !defined(__m68k__) && !defined(__amd64__) 83 static void bsd_to_linux_statfs64(const struct statvfs *, 84 struct linux_statfs64 *); 85 #endif 86 87 /* 88 * Alarm. This is a libc call which uses setitimer(2) in NetBSD. 89 * Fiddle with the timers to make it work. 90 * 91 * XXX This shouldn't be dicking about with the ptimer stuff directly. 92 */ 93 int 94 linux_sys_alarm(struct lwp *l, const struct linux_sys_alarm_args *uap, register_t *retval) 95 { 96 /* { 97 syscallarg(unsigned int) secs; 98 } */ 99 struct proc *p = l->l_proc; 100 struct timespec now; 101 struct itimerspec *itp, it; 102 struct ptimer *ptp, *spare; 103 extern kmutex_t timer_lock; 104 struct ptimers *pts; 105 106 if ((pts = p->p_timers) == NULL) 107 pts = timers_alloc(p); 108 spare = NULL; 109 110 retry: 111 mutex_spin_enter(&timer_lock); 112 if (pts && pts->pts_timers[ITIMER_REAL]) 113 itp = &pts->pts_timers[ITIMER_REAL]->pt_time; 114 else 115 itp = NULL; 116 /* 117 * Clear any pending timer alarms. 118 */ 119 if (itp) { 120 callout_stop(&pts->pts_timers[ITIMER_REAL]->pt_ch); 121 timespecclear(&itp->it_interval); 122 getnanotime(&now); 123 if (timespecisset(&itp->it_value) && 124 timespeccmp(&itp->it_value, &now, >)) 125 timespecsub(&itp->it_value, &now, &itp->it_value); 126 /* 127 * Return how many seconds were left (rounded up) 128 */ 129 retval[0] = itp->it_value.tv_sec; 130 if (itp->it_value.tv_nsec) 131 retval[0]++; 132 } else { 133 retval[0] = 0; 134 } 135 136 /* 137 * alarm(0) just resets the timer. 138 */ 139 if (SCARG(uap, secs) == 0) { 140 if (itp) 141 timespecclear(&itp->it_value); 142 mutex_spin_exit(&timer_lock); 143 return 0; 144 } 145 146 /* 147 * Check the new alarm time for sanity, and set it. 148 */ 149 timespecclear(&it.it_interval); 150 it.it_value.tv_sec = SCARG(uap, secs); 151 it.it_value.tv_nsec = 0; 152 if (itimespecfix(&it.it_value) || itimespecfix(&it.it_interval)) { 153 mutex_spin_exit(&timer_lock); 154 return (EINVAL); 155 } 156 157 ptp = pts->pts_timers[ITIMER_REAL]; 158 if (ptp == NULL) { 159 if (spare == NULL) { 160 mutex_spin_exit(&timer_lock); 161 spare = pool_get(&ptimer_pool, PR_WAITOK); 162 goto retry; 163 } 164 ptp = spare; 165 spare = NULL; 166 ptp->pt_ev.sigev_notify = SIGEV_SIGNAL; 167 ptp->pt_ev.sigev_signo = SIGALRM; 168 ptp->pt_overruns = 0; 169 ptp->pt_proc = p; 170 ptp->pt_type = CLOCK_REALTIME; 171 ptp->pt_entry = CLOCK_REALTIME; 172 ptp->pt_active = 0; 173 ptp->pt_queued = 0; 174 callout_init(&ptp->pt_ch, CALLOUT_MPSAFE); 175 pts->pts_timers[ITIMER_REAL] = ptp; 176 } 177 178 if (timespecisset(&it.it_value)) { 179 /* 180 * Don't need to check tvhzto() return value, here. 181 * callout_reset() does it for us. 182 */ 183 getnanotime(&now); 184 timespecadd(&it.it_value, &now, &it.it_value); 185 callout_reset(&ptp->pt_ch, tshzto(&it.it_value), 186 realtimerexpire, ptp); 187 } 188 ptp->pt_time = it; 189 mutex_spin_exit(&timer_lock); 190 191 return 0; 192 } 193 #endif /* !COMPAT_LINUX32 */ 194 195 #if !defined(__amd64__) 196 int 197 linux_sys_nice(struct lwp *l, const struct linux_sys_nice_args *uap, register_t *retval) 198 { 199 /* { 200 syscallarg(int) incr; 201 } */ 202 struct proc *p = l->l_proc; 203 struct sys_setpriority_args bsa; 204 205 SCARG(&bsa, which) = PRIO_PROCESS; 206 SCARG(&bsa, who) = 0; 207 SCARG(&bsa, prio) = p->p_nice - NZERO + SCARG(uap, incr); 208 209 return sys_setpriority(l, &bsa, retval); 210 } 211 #endif /* !__amd64__ */ 212 213 #ifndef COMPAT_LINUX32 214 #ifndef __amd64__ 215 /* 216 * The old Linux readdir was only able to read one entry at a time, 217 * even though it had a 'count' argument. In fact, the emulation 218 * of the old call was better than the original, because it did handle 219 * the count arg properly. Don't bother with it anymore now, and use 220 * it to distinguish between old and new. The difference is that the 221 * newer one actually does multiple entries, and the reclen field 222 * really is the reclen, not the namelength. 223 */ 224 int 225 linux_sys_readdir(struct lwp *l, const struct linux_sys_readdir_args *uap, register_t *retval) 226 { 227 /* { 228 syscallarg(int) fd; 229 syscallarg(struct linux_dirent *) dent; 230 syscallarg(unsigned int) count; 231 } */ 232 int error; 233 struct linux_sys_getdents_args da; 234 235 SCARG(&da, fd) = SCARG(uap, fd); 236 SCARG(&da, dent) = SCARG(uap, dent); 237 SCARG(&da, count) = 1; 238 239 error = linux_sys_getdents(l, &da, retval); 240 if (error == 0 && *retval > 1) 241 *retval = 1; 242 243 return error; 244 } 245 #endif /* !amd64 */ 246 247 /* 248 * I wonder why Linux has gettimeofday() _and_ time().. Still, we 249 * need to deal with it. 250 */ 251 int 252 linux_sys_time(struct lwp *l, const struct linux_sys_time_args *uap, register_t *retval) 253 { 254 /* { 255 syscallarg(linux_time_t) *t; 256 } */ 257 struct timeval atv; 258 linux_time_t tt; 259 int error; 260 261 microtime(&atv); 262 263 tt = atv.tv_sec; 264 if (SCARG(uap, t) && (error = copyout(&tt, SCARG(uap, t), sizeof tt))) 265 return error; 266 267 retval[0] = tt; 268 return 0; 269 } 270 271 /* 272 * utime(). Do conversion to things that utimes() understands, 273 * and pass it on. 274 */ 275 int 276 linux_sys_utime(struct lwp *l, const struct linux_sys_utime_args *uap, register_t *retval) 277 { 278 /* { 279 syscallarg(const char *) path; 280 syscallarg(struct linux_utimbuf *)times; 281 } */ 282 int error; 283 struct timeval tv[2], *tvp; 284 struct linux_utimbuf lut; 285 286 if (SCARG(uap, times) != NULL) { 287 if ((error = copyin(SCARG(uap, times), &lut, sizeof lut))) 288 return error; 289 tv[0].tv_usec = tv[1].tv_usec = 0; 290 tv[0].tv_sec = lut.l_actime; 291 tv[1].tv_sec = lut.l_modtime; 292 tvp = tv; 293 } else 294 tvp = NULL; 295 296 return do_sys_utimes(l, NULL, SCARG(uap, path), FOLLOW, 297 tvp, UIO_SYSSPACE); 298 } 299 300 #ifndef __amd64__ 301 /* 302 * waitpid(2). Just forward on to linux_sys_wait4 with a NULL rusage. 303 */ 304 int 305 linux_sys_waitpid(struct lwp *l, const struct linux_sys_waitpid_args *uap, register_t *retval) 306 { 307 /* { 308 syscallarg(int) pid; 309 syscallarg(int *) status; 310 syscallarg(int) options; 311 } */ 312 struct linux_sys_wait4_args linux_w4a; 313 314 SCARG(&linux_w4a, pid) = SCARG(uap, pid); 315 SCARG(&linux_w4a, status) = SCARG(uap, status); 316 SCARG(&linux_w4a, options) = SCARG(uap, options); 317 SCARG(&linux_w4a, rusage) = NULL; 318 319 return linux_sys_wait4(l, &linux_w4a, retval); 320 } 321 #endif /* !amd64 */ 322 323 int 324 linux_sys_setresgid(struct lwp *l, const struct linux_sys_setresgid_args *uap, register_t *retval) 325 { 326 /* { 327 syscallarg(gid_t) rgid; 328 syscallarg(gid_t) egid; 329 syscallarg(gid_t) sgid; 330 } */ 331 332 /* 333 * Note: These checks are a little different than the NetBSD 334 * setregid(2) call performs. This precisely follows the 335 * behavior of the Linux kernel. 336 */ 337 return do_setresgid(l, SCARG(uap,rgid), SCARG(uap, egid), 338 SCARG(uap, sgid), 339 ID_R_EQ_R | ID_R_EQ_E | ID_R_EQ_S | 340 ID_E_EQ_R | ID_E_EQ_E | ID_E_EQ_S | 341 ID_S_EQ_R | ID_S_EQ_E | ID_S_EQ_S ); 342 } 343 344 int 345 linux_sys_getresgid(struct lwp *l, const struct linux_sys_getresgid_args *uap, register_t *retval) 346 { 347 /* { 348 syscallarg(gid_t *) rgid; 349 syscallarg(gid_t *) egid; 350 syscallarg(gid_t *) sgid; 351 } */ 352 kauth_cred_t pc = l->l_cred; 353 int error; 354 gid_t gid; 355 356 /* 357 * Linux copies these values out to userspace like so: 358 * 359 * 1. Copy out rgid. 360 * 2. If that succeeds, copy out egid. 361 * 3. If both of those succeed, copy out sgid. 362 */ 363 gid = kauth_cred_getgid(pc); 364 if ((error = copyout(&gid, SCARG(uap, rgid), sizeof(gid_t))) != 0) 365 return (error); 366 367 gid = kauth_cred_getegid(pc); 368 if ((error = copyout(&gid, SCARG(uap, egid), sizeof(gid_t))) != 0) 369 return (error); 370 371 gid = kauth_cred_getsvgid(pc); 372 373 return (copyout(&gid, SCARG(uap, sgid), sizeof(gid_t))); 374 } 375 376 #ifndef __amd64__ 377 /* 378 * I wonder why Linux has settimeofday() _and_ stime().. Still, we 379 * need to deal with it. 380 */ 381 int 382 linux_sys_stime(struct lwp *l, const struct linux_sys_stime_args *uap, register_t *retval) 383 { 384 /* { 385 syscallarg(linux_time_t) *t; 386 } */ 387 struct timespec ats; 388 linux_time_t tt; 389 int error; 390 391 if ((error = copyin(&tt, SCARG(uap, t), sizeof tt)) != 0) 392 return error; 393 394 ats.tv_sec = tt; 395 ats.tv_nsec = 0; 396 397 if ((error = settime(l->l_proc, &ats))) 398 return (error); 399 400 return 0; 401 } 402 #endif /* !amd64 */ 403 404 #if !defined(__m68k__) && !defined(__amd64__) 405 /* 406 * Convert NetBSD statvfs structure to Linux statfs64 structure. 407 * See comments in bsd_to_linux_statfs() for further background. 408 * We can safely pass correct bsize and frsize here, since Linux glibc 409 * statvfs() doesn't use statfs64(). 410 */ 411 static void 412 bsd_to_linux_statfs64(const struct statvfs *bsp, struct linux_statfs64 *lsp) 413 { 414 int i, div; 415 416 for (i = 0; i < linux_fstypes_cnt; i++) { 417 if (strcmp(bsp->f_fstypename, linux_fstypes[i].bsd) == 0) { 418 lsp->l_ftype = linux_fstypes[i].linux; 419 break; 420 } 421 } 422 423 if (i == linux_fstypes_cnt) { 424 DPRINTF(("unhandled fstype in linux emulation: %s\n", 425 bsp->f_fstypename)); 426 lsp->l_ftype = LINUX_DEFAULT_SUPER_MAGIC; 427 } 428 429 div = bsp->f_frsize ? (bsp->f_bsize / bsp->f_frsize) : 1; 430 if (div == 0) 431 div = 1; 432 lsp->l_fbsize = bsp->f_bsize; 433 lsp->l_ffrsize = bsp->f_frsize; 434 lsp->l_fblocks = bsp->f_blocks / div; 435 lsp->l_fbfree = bsp->f_bfree / div; 436 lsp->l_fbavail = bsp->f_bavail / div; 437 lsp->l_ffiles = bsp->f_files; 438 lsp->l_fffree = bsp->f_ffree / div; 439 /* Linux sets the fsid to 0..., we don't */ 440 lsp->l_ffsid.val[0] = bsp->f_fsidx.__fsid_val[0]; 441 lsp->l_ffsid.val[1] = bsp->f_fsidx.__fsid_val[1]; 442 lsp->l_fnamelen = bsp->f_namemax; 443 (void)memset(lsp->l_fspare, 0, sizeof(lsp->l_fspare)); 444 } 445 446 /* 447 * Implement the fs stat functions. Straightforward. 448 */ 449 int 450 linux_sys_statfs64(struct lwp *l, const struct linux_sys_statfs64_args *uap, register_t *retval) 451 { 452 /* { 453 syscallarg(const char *) path; 454 syscallarg(size_t) sz; 455 syscallarg(struct linux_statfs64 *) sp; 456 } */ 457 struct statvfs *sb; 458 struct linux_statfs64 ltmp; 459 int error; 460 461 if (SCARG(uap, sz) != sizeof ltmp) 462 return (EINVAL); 463 464 sb = STATVFSBUF_GET(); 465 error = do_sys_pstatvfs(l, SCARG(uap, path), ST_WAIT, sb); 466 if (error == 0) { 467 bsd_to_linux_statfs64(sb, <mp); 468 error = copyout(<mp, SCARG(uap, sp), sizeof ltmp); 469 } 470 STATVFSBUF_PUT(sb); 471 return error; 472 } 473 474 int 475 linux_sys_fstatfs64(struct lwp *l, const struct linux_sys_fstatfs64_args *uap, register_t *retval) 476 { 477 /* { 478 syscallarg(int) fd; 479 syscallarg(size_t) sz; 480 syscallarg(struct linux_statfs64 *) sp; 481 } */ 482 struct statvfs *sb; 483 struct linux_statfs64 ltmp; 484 int error; 485 486 if (SCARG(uap, sz) != sizeof ltmp) 487 return (EINVAL); 488 489 sb = STATVFSBUF_GET(); 490 error = do_sys_fstatvfs(l, SCARG(uap, fd), ST_WAIT, sb); 491 if (error == 0) { 492 bsd_to_linux_statfs64(sb, <mp); 493 error = copyout(<mp, SCARG(uap, sp), sizeof ltmp); 494 } 495 STATVFSBUF_PUT(sb); 496 return error; 497 } 498 #endif /* !__m68k__ && !__amd64__ */ 499 #endif /* !COMPAT_LINUX32 */ 500