sys/emulation/linux/linux_signal.c

   1 /*-
   2  * Copyright (c) 1994-1995 Søren Schmidt
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer
  10  *    in this position and unchanged.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  * 3. The name of the author may not be used to endorse or promote products
  15  *    derived from this software withough specific prior written permission
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  *
  28  * $FreeBSD: src/sys/compat/linux/linux_signal.c,v 1.23.2.3 2001/11/05 19:08:23 marcel Exp $
  29  * $DragonFly: src/sys/emulation/linux/linux_signal.c,v 1.14 2007/03/12 21:07:42 corecode Exp $
  30  */
  31
  32 #include <sys/param.h>
  33 #include <sys/systm.h>
  34 #include <sys/lock.h>
  35 #include <sys/proc.h>
  36 #include <sys/signalvar.h>
  37 #include <sys/sysproto.h>
  38 #include <sys/kern_syscall.h>
  39 #include <sys/thread.h>
  40
  41 #include <sys/thread2.h>
  42 #include <sys/mplock2.h>
  43
  44 #include <arch_linux/linux.h>
  45 #include <arch_linux/linux_proto.h>
  46 #include "linux_signal.h"
  47 #include "linux_util.h"
  48
  49 void
  50 linux_to_bsd_sigset(l_sigset_t *lss, sigset_t *bss)
  51 {
  52         int b, l;
  53
  54         SIGEMPTYSET(*bss);
  55         bss->__bits[0] = lss->__bits[0] & ~((1U << LINUX_SIGTBLSZ) - 1);
  56         bss->__bits[1] = lss->__bits[1];
  57         for (l = 1; l <= LINUX_SIGTBLSZ; l++) {
  58                 if (LINUX_SIGISMEMBER(*lss, l)) {
  59                         b = linux_to_bsd_signal[_SIG_IDX(l)];
  60                         if (b)
  61                                 SIGADDSET(*bss, b);
  62                 }
  63         }
  64 }
  65
  66 void
  67 bsd_to_linux_sigset(sigset_t *bss, l_sigset_t *lss)
  68 {
  69         int b, l;
  70
  71         LINUX_SIGEMPTYSET(*lss);
  72         lss->__bits[0] = bss->__bits[0] & ~((1U << LINUX_SIGTBLSZ) - 1);
  73         lss->__bits[1] = bss->__bits[1];
  74         for (b = 1; b <= LINUX_SIGTBLSZ; b++) {
  75                 if (SIGISMEMBER(*bss, b)) {
  76                         l = bsd_to_linux_signal[_SIG_IDX(b)];
  77                         if (l)
  78                                 LINUX_SIGADDSET(*lss, l);
  79                 }
  80         }
  81 }
  82
  83 void
  84 linux_to_bsd_sigaction(l_sigaction_t *lsa, struct sigaction *bsa)
  85 {
  86
  87         linux_to_bsd_sigset(&lsa->lsa_mask, &bsa->sa_mask);
  88         bsa->sa_handler = lsa->lsa_handler;
  89         bsa->sa_flags = 0;
  90         if (lsa->lsa_flags & LINUX_SA_NOCLDSTOP)
  91                 bsa->sa_flags |= SA_NOCLDSTOP;
  92         if (lsa->lsa_flags & LINUX_SA_NOCLDWAIT)
  93                 bsa->sa_flags |= SA_NOCLDWAIT;
  94         if (lsa->lsa_flags & LINUX_SA_SIGINFO)
  95                 bsa->sa_flags |= SA_SIGINFO;
  96         if (lsa->lsa_flags & LINUX_SA_ONSTACK)
  97                 bsa->sa_flags |= SA_ONSTACK;
  98         if (lsa->lsa_flags & LINUX_SA_RESTART)
  99                 bsa->sa_flags |= SA_RESTART;
 100         if (lsa->lsa_flags & LINUX_SA_ONESHOT)
 101                 bsa->sa_flags |= SA_RESETHAND;
 102         if (lsa->lsa_flags & LINUX_SA_NOMASK)
 103                 bsa->sa_flags |= SA_NODEFER;
 104 }
 105
 106 void
 107 bsd_to_linux_sigaction(struct sigaction *bsa, l_sigaction_t *lsa)
 108 {
 109
 110         bsd_to_linux_sigset(&bsa->sa_mask, &lsa->lsa_mask);
 111         lsa->lsa_handler = bsa->sa_handler;
 112         lsa->lsa_restorer = NULL;       /* unsupported */
 113         lsa->lsa_flags = 0;
 114         if (bsa->sa_flags & SA_NOCLDSTOP)
 115                 lsa->lsa_flags |= LINUX_SA_NOCLDSTOP;
 116         if (bsa->sa_flags & SA_NOCLDWAIT)
 117                 lsa->lsa_flags |= LINUX_SA_NOCLDWAIT;
 118         if (bsa->sa_flags & SA_SIGINFO)
 119                 lsa->lsa_flags |= LINUX_SA_SIGINFO;
 120         if (bsa->sa_flags & SA_ONSTACK)
 121                 lsa->lsa_flags |= LINUX_SA_ONSTACK;
 122         if (bsa->sa_flags & SA_RESTART)
 123                 lsa->lsa_flags |= LINUX_SA_RESTART;
 124         if (bsa->sa_flags & SA_RESETHAND)
 125                 lsa->lsa_flags |= LINUX_SA_ONESHOT;
 126         if (bsa->sa_flags & SA_NODEFER)
 127                 lsa->lsa_flags |= LINUX_SA_NOMASK;
 128 }
 129
 130 /*
 131  * MPALMOSTSAFE
 132  */
 133 int
 134 sys_linux_signal(struct linux_signal_args *args)
 135 {
 136         l_sigaction_t linux_nsa, linux_osa;
 137         struct sigaction nsa, osa;
 138         int error, sig;
 139
 140 #ifdef DEBUG
 141         if (ldebug(signal))
 142                 kprintf(ARGS(signal, "%d, %p"),
 143                     args->sig, (void *)args->handler);
 144 #endif
 145         linux_nsa.lsa_handler = args->handler;
 146         linux_nsa.lsa_flags = LINUX_SA_ONESHOT | LINUX_SA_NOMASK;
 147         LINUX_SIGEMPTYSET(linux_nsa.lsa_mask);
 148         linux_to_bsd_sigaction(&linux_nsa, &nsa);
 149         if (args->sig <= LINUX_SIGTBLSZ) {
 150                 sig = linux_to_bsd_signal[_SIG_IDX(args->sig)];
 151         } else {
 152                 sig = args->sig;
 153         }
 154
 155         get_mplock();
 156         error = kern_sigaction(sig, &nsa, &osa);
 157         rel_mplock();
 158
 159         bsd_to_linux_sigaction(&osa, &linux_osa);
 160         args->sysmsg_result = (int) linux_osa.lsa_handler;
 161         return (error);
 162 }
 163
 164 /*
 165  * MPALMOSTSAFE
 166  */
 167 int
 168 sys_linux_rt_sigaction(struct linux_rt_sigaction_args *args)
 169 {
 170         l_sigaction_t linux_nsa, linux_osa;
 171         struct sigaction nsa, osa;
 172         int error, sig;
 173
 174 #ifdef DEBUG
 175         if (ldebug(rt_sigaction))
 176                 kprintf(ARGS(rt_sigaction, "%ld, %p, %p, %ld"),
 177                     (long)args->sig, (void *)args->act,
 178                     (void *)args->oact, (long)args->sigsetsize);
 179 #endif
 180         if (args->sigsetsize != sizeof(l_sigset_t))
 181                 return (EINVAL);
 182
 183         if (args->act) {
 184                 error = copyin(args->act, &linux_nsa, sizeof(linux_nsa));
 185                 if (error)
 186                         return (error);
 187                 linux_to_bsd_sigaction(&linux_nsa, &nsa);
 188         }
 189         if (args->sig <= LINUX_SIGTBLSZ) {
 190                 sig = linux_to_bsd_signal[_SIG_IDX(args->sig)];
 191         } else {
 192                 sig = args->sig;
 193         }
 194
 195         get_mplock();
 196         error = kern_sigaction(sig, args->act ? &nsa : NULL,
 197                                args->oact ? &osa : NULL);
 198         rel_mplock();
 199
 200         if (error == 0 && args->oact) {
 201                 bsd_to_linux_sigaction(&osa, &linux_osa);
 202                 error = copyout(&linux_osa, args->oact, sizeof(linux_osa));
 203         }
 204
 205         return (error);
 206 }
 207
 208 static int
 209 linux_to_bsd_sigprocmask(int how)
 210 {
 211         switch (how) {
 212         case LINUX_SIG_BLOCK:
 213                 return SIG_BLOCK;
 214         case LINUX_SIG_UNBLOCK:
 215                 return SIG_UNBLOCK;
 216         case LINUX_SIG_SETMASK:
 217                 return SIG_SETMASK;
 218         default:
 219                 return (-1);
 220         }
 221 }
 222
 223 /*
 224  * MPALMOSTSAFE
 225  */
 226 int
 227 sys_linux_sigprocmask(struct linux_sigprocmask_args *args)
 228 {
 229         l_osigset_t mask;
 230         l_sigset_t linux_set, linux_oset;
 231         sigset_t set, oset;
 232         int error, how;
 233
 234 #ifdef DEBUG
 235         if (ldebug(sigprocmask))
 236                 kprintf(ARGS(sigprocmask, "%d, *, *"), args->how);
 237 #endif
 238
 239         if (args->mask) {
 240                 error = copyin(args->mask, &mask, sizeof(l_osigset_t));
 241                 if (error)
 242                         return (error);
 243                 LINUX_SIGEMPTYSET(linux_set);
 244                 linux_set.__bits[0] = mask;
 245                 linux_to_bsd_sigset(&linux_set, &set);
 246         }
 247         how = linux_to_bsd_sigprocmask(args->how);
 248
 249         get_mplock();
 250         error = kern_sigprocmask(how, args->mask ? &set : NULL,
 251                                  args->omask ? &oset : NULL);
 252         rel_mplock();
 253
 254         if (error == 0 && args->omask) {
 255                 bsd_to_linux_sigset(&oset, &linux_oset);
 256                 mask = linux_oset.__bits[0];
 257                 error = copyout(&mask, args->omask, sizeof(l_osigset_t));
 258         }
 259         return (error);
 260 }
 261
 262 /*
 263  * MPALMOSTSAFE
 264  */
 265 int
 266 sys_linux_rt_sigprocmask(struct linux_rt_sigprocmask_args *args)
 267 {
 268         l_sigset_t linux_set, linux_oset;
 269         sigset_t set, oset;
 270         int error, how;
 271
 272 #ifdef DEBUG
 273         if (ldebug(rt_sigprocmask))
 274                 kprintf(ARGS(rt_sigprocmask, "%d, %p, %p, %ld"),
 275                     args->how, (void *)args->mask,
 276                     (void *)args->omask, (long)args->sigsetsize);
 277 #endif
 278
 279         if (args->sigsetsize != sizeof(l_sigset_t))
 280                 return EINVAL;
 281
 282         if (args->mask) {
 283                 error = copyin(args->mask, &linux_set, sizeof(l_sigset_t));
 284                 if (error)
 285                         return (error);
 286                 linux_to_bsd_sigset(&linux_set, &set);
 287         }
 288         how = linux_to_bsd_sigprocmask(args->how);
 289
 290         get_mplock();
 291         error = kern_sigprocmask(how, args->mask ? &set : NULL,
 292                                  args->omask ? &oset : NULL);
 293         rel_mplock();
 294
 295         if (error == 0 && args->omask) {
 296                 bsd_to_linux_sigset(&oset, &linux_oset);
 297                 error = copyout(&linux_oset, args->omask, sizeof(l_sigset_t));
 298         }
 299
 300         return (error);
 301 }
 302
 303 /*
 304  * MPSAFE
 305  */
 306 int
 307 sys_linux_sgetmask(struct linux_sgetmask_args *args)
 308 {
 309         struct lwp *lp = curthread->td_lwp;
 310         l_sigset_t mask;
 311
 312 #ifdef DEBUG
 313         if (ldebug(sgetmask))
 314                 kprintf(ARGS(sgetmask, ""));
 315 #endif
 316
 317         bsd_to_linux_sigset(&lp->lwp_sigmask, &mask);
 318         args->sysmsg_result = mask.__bits[0];
 319         return (0);
 320 }
 321
 322 /*
 323  * MPSAFE
 324  */
 325 int
 326 sys_linux_ssetmask(struct linux_ssetmask_args *args)
 327 {
 328         struct lwp *lp = curthread->td_lwp;
 329         l_sigset_t lset;
 330         sigset_t bset;
 331
 332 #ifdef DEBUG
 333         if (ldebug(ssetmask))
 334                 kprintf(ARGS(ssetmask, "%08lx"), (unsigned long)args->mask);
 335 #endif
 336
 337         bsd_to_linux_sigset(&lp->lwp_sigmask, &lset);
 338         args->sysmsg_result = lset.__bits[0];
 339         LINUX_SIGEMPTYSET(lset);
 340         lset.__bits[0] = args->mask;
 341         linux_to_bsd_sigset(&lset, &bset);
 342         crit_enter();
 343         lp->lwp_sigmask = bset;
 344         SIG_CANTMASK(lp->lwp_sigmask);
 345         crit_exit();
 346         return (0);
 347 }
 348
 349 /*
 350  * MPSAFE
 351  */
 352 int
 353 sys_linux_sigpending(struct linux_sigpending_args *args)
 354 {
 355         struct thread *td = curthread;
 356         struct lwp *lp = td->td_lwp;
 357         sigset_t set;
 358         l_sigset_t linux_set;
 359         l_osigset_t mask;
 360         int error;
 361
 362 #ifdef DEBUG
 363         if (ldebug(sigpending))
 364                 kprintf(ARGS(sigpending, "*"));
 365 #endif
 366
 367         error = kern_sigpending(&set);
 368
 369         if (error == 0) {
 370                 SIGSETAND(set, lp->lwp_sigmask);
 371                 bsd_to_linux_sigset(&set, &linux_set);
 372                 mask = linux_set.__bits[0];
 373                 error = copyout(&mask, args->mask, sizeof(mask));
 374         }
 375         return (error);
 376 }
 377
 378 /*
 379  * MPALMOSTSAFE
 380  */
 381 int
 382 sys_linux_kill(struct linux_kill_args *args)
 383 {
 384         int error, sig;
 385
 386 #ifdef DEBUG
 387         if (ldebug(kill))
 388                 kprintf(ARGS(kill, "%d, %d"), args->pid, args->signum);
 389 #endif
 390
 391         /*
 392          * Allow signal 0 as a means to check for privileges
 393          */
 394         if (args->signum < 0 || args->signum > LINUX_NSIG)
 395                 return EINVAL;
 396
 397         if (args->signum > 0 && args->signum <= LINUX_SIGTBLSZ)
 398                 sig = linux_to_bsd_signal[_SIG_IDX(args->signum)];
 399         else
 400                 sig = args->signum;
 401
 402         get_mplock();
 403         error = kern_kill(sig, args->pid, -1);
 404         rel_mplock();
 405
 406         return(error);
 407 }
 408