linux_signal.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause
    3  *
    4  * Copyright (c) 1994-1995 Søren Schmidt
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD$");
   31 
   32 #include <sys/param.h>
   33 #include <sys/systm.h>
   34 #include <sys/lock.h>
   35 #include <sys/mutex.h>
   36 #include <sys/sx.h>
   37 #include <sys/proc.h>
   38 #include <sys/signalvar.h>
   39 #include <sys/syscallsubr.h>
   40 #include <sys/sysproto.h>
   41 
   42 #include <security/audit/audit.h>
   43 
   44 #include "opt_compat.h"
   45 
   46 #ifdef COMPAT_LINUX32
   47 #include <machine/../linux32/linux.h>
   48 #include <machine/../linux32/linux32_proto.h>
   49 #else
   50 #include <machine/../linux/linux.h>
   51 #include <machine/../linux/linux_proto.h>
   52 #endif
   53 #include <compat/linux/linux_signal.h>
   54 #include <compat/linux/linux_util.h>
   55 #include <compat/linux/linux_emul.h>
   56 #include <compat/linux/linux_misc.h>
   57 
   58 static int      linux_do_tkill(struct thread *td, struct thread *tdt,
   59                     ksiginfo_t *ksi);
   60 static void     sicode_to_lsicode(int si_code, int *lsi_code);
   61 
   62 static void
   63 linux_to_bsd_sigaction(l_sigaction_t *lsa, struct sigaction *bsa)
   64 {
   65         unsigned long flags;
   66 
   67         linux_to_bsd_sigset(&lsa->lsa_mask, &bsa->sa_mask);
   68         bsa->sa_handler = PTRIN(lsa->lsa_handler);
   69         bsa->sa_flags = 0;
   70 
   71         flags = lsa->lsa_flags;
   72         if (lsa->lsa_flags & LINUX_SA_NOCLDSTOP) {
   73                 flags &= ~LINUX_SA_NOCLDSTOP;
   74                 bsa->sa_flags |= SA_NOCLDSTOP;
   75         }
   76         if (lsa->lsa_flags & LINUX_SA_NOCLDWAIT) {
   77                 flags &= ~LINUX_SA_NOCLDWAIT;
   78                 bsa->sa_flags |= SA_NOCLDWAIT;
   79         }
   80         if (lsa->lsa_flags & LINUX_SA_SIGINFO) {
   81                 flags &= ~LINUX_SA_SIGINFO;
   82                 bsa->sa_flags |= SA_SIGINFO;
   83 #ifdef notyet
   84                 /*
   85                  * XXX: We seem to be missing code to convert
   86                  *      some of the fields in ucontext_t.
   87                  */
   88                 linux_msg(curthread,
   89                     "partially unsupported sigaction flag SA_SIGINFO");
   90 #endif
   91         }
   92         if (lsa->lsa_flags & LINUX_SA_RESTORER) {
   93                 flags &= ~LINUX_SA_RESTORER;
   94                 /* XXX: We might want to handle it; see Linux sigreturn(2). */
   95         }
   96         if (lsa->lsa_flags & LINUX_SA_ONSTACK) {
   97                 flags &= ~LINUX_SA_ONSTACK;
   98                 bsa->sa_flags |= SA_ONSTACK;
   99         }
  100         if (lsa->lsa_flags & LINUX_SA_RESTART) {
  101                 flags &= ~LINUX_SA_RESTART;
  102                 bsa->sa_flags |= SA_RESTART;
  103         }
  104         if (lsa->lsa_flags & LINUX_SA_INTERRUPT) {
  105                 flags &= ~LINUX_SA_INTERRUPT;
  106                 /* Documented to be a "historical no-op". */
  107         }
  108         if (lsa->lsa_flags & LINUX_SA_ONESHOT) {
  109                 flags &= ~LINUX_SA_ONESHOT;
  110                 bsa->sa_flags |= SA_RESETHAND;
  111         }
  112         if (lsa->lsa_flags & LINUX_SA_NOMASK) {
  113                 flags &= ~LINUX_SA_NOMASK;
  114                 bsa->sa_flags |= SA_NODEFER;
  115         }
  116 
  117         if (flags != 0)
  118                 linux_msg(curthread, "unsupported sigaction flag %#lx", flags);
  119 }
  120 
  121 static void
  122 bsd_to_linux_sigaction(struct sigaction *bsa, l_sigaction_t *lsa)
  123 {
  124 
  125         bsd_to_linux_sigset(&bsa->sa_mask, &lsa->lsa_mask);
  126 #ifdef COMPAT_LINUX32
  127         lsa->lsa_handler = (uintptr_t)bsa->sa_handler;
  128 #else
  129         lsa->lsa_handler = bsa->sa_handler;
  130 #endif
  131         lsa->lsa_restorer = 0;          /* unsupported */
  132         lsa->lsa_flags = 0;
  133         if (bsa->sa_flags & SA_NOCLDSTOP)
  134                 lsa->lsa_flags |= LINUX_SA_NOCLDSTOP;
  135         if (bsa->sa_flags & SA_NOCLDWAIT)
  136                 lsa->lsa_flags |= LINUX_SA_NOCLDWAIT;
  137         if (bsa->sa_flags & SA_SIGINFO)
  138                 lsa->lsa_flags |= LINUX_SA_SIGINFO;
  139         if (bsa->sa_flags & SA_ONSTACK)
  140                 lsa->lsa_flags |= LINUX_SA_ONSTACK;
  141         if (bsa->sa_flags & SA_RESTART)
  142                 lsa->lsa_flags |= LINUX_SA_RESTART;
  143         if (bsa->sa_flags & SA_RESETHAND)
  144                 lsa->lsa_flags |= LINUX_SA_ONESHOT;
  145         if (bsa->sa_flags & SA_NODEFER)
  146                 lsa->lsa_flags |= LINUX_SA_NOMASK;
  147 }
  148 
  149 int
  150 linux_do_sigaction(struct thread *td, int linux_sig, l_sigaction_t *linux_nsa,
  151                    l_sigaction_t *linux_osa)
  152 {
  153         struct sigaction act, oact, *nsa, *osa;
  154         int error, sig;
  155 
  156         if (!LINUX_SIG_VALID(linux_sig))
  157                 return (EINVAL);
  158 
  159         osa = (linux_osa != NULL) ? &oact : NULL;
  160         if (linux_nsa != NULL) {
  161                 nsa = &act;
  162                 linux_to_bsd_sigaction(linux_nsa, nsa);
  163         } else
  164                 nsa = NULL;
  165         sig = linux_to_bsd_signal(linux_sig);
  166 
  167         error = kern_sigaction(td, sig, nsa, osa, 0);
  168         if (error)
  169                 return (error);
  170 
  171         if (linux_osa != NULL)
  172                 bsd_to_linux_sigaction(osa, linux_osa);
  173 
  174         return (0);
  175 }
  176 
  177 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
  178 int
  179 linux_signal(struct thread *td, struct linux_signal_args *args)
  180 {
  181         l_sigaction_t nsa, osa;
  182         int error;
  183 
  184         nsa.lsa_handler = args->handler;
  185         nsa.lsa_flags = LINUX_SA_ONESHOT | LINUX_SA_NOMASK;
  186         LINUX_SIGEMPTYSET(nsa.lsa_mask);
  187 
  188         error = linux_do_sigaction(td, args->sig, &nsa, &osa);
  189         td->td_retval[0] = (int)(intptr_t)osa.lsa_handler;
  190 
  191         return (error);
  192 }
  193 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */
  194 
  195 int
  196 linux_rt_sigaction(struct thread *td, struct linux_rt_sigaction_args *args)
  197 {
  198         l_sigaction_t nsa, osa;
  199         int error;
  200 
  201         if (args->sigsetsize != sizeof(l_sigset_t))
  202                 return (EINVAL);
  203 
  204         if (args->act != NULL) {
  205                 error = copyin(args->act, &nsa, sizeof(l_sigaction_t));
  206                 if (error)
  207                         return (error);
  208         }
  209 
  210         error = linux_do_sigaction(td, args->sig,
  211                                    args->act ? &nsa : NULL,
  212                                    args->oact ? &osa : NULL);
  213 
  214         if (args->oact != NULL && !error) {
  215                 error = copyout(&osa, args->oact, sizeof(l_sigaction_t));
  216         }
  217 
  218         return (error);
  219 }
  220 
  221 static int
  222 linux_do_sigprocmask(struct thread *td, int how, l_sigset_t *new,
  223                      l_sigset_t *old)
  224 {
  225         sigset_t omask, nmask;
  226         sigset_t *nmaskp;
  227         int error;
  228 
  229         td->td_retval[0] = 0;
  230 
  231         switch (how) {
  232         case LINUX_SIG_BLOCK:
  233                 how = SIG_BLOCK;
  234                 break;
  235         case LINUX_SIG_UNBLOCK:
  236                 how = SIG_UNBLOCK;
  237                 break;
  238         case LINUX_SIG_SETMASK:
  239                 how = SIG_SETMASK;
  240                 break;
  241         default:
  242                 return (EINVAL);
  243         }
  244         if (new != NULL) {
  245                 linux_to_bsd_sigset(new, &nmask);
  246                 nmaskp = &nmask;
  247         } else
  248                 nmaskp = NULL;
  249         error = kern_sigprocmask(td, how, nmaskp, &omask, 0);
  250         if (error == 0 && old != NULL)
  251                 bsd_to_linux_sigset(&omask, old);
  252 
  253         return (error);
  254 }
  255 
  256 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
  257 int
  258 linux_sigprocmask(struct thread *td, struct linux_sigprocmask_args *args)
  259 {
  260         l_osigset_t mask;
  261         l_sigset_t set, oset;
  262         int error;
  263 
  264         if (args->mask != NULL) {
  265                 error = copyin(args->mask, &mask, sizeof(l_osigset_t));
  266                 if (error)
  267                         return (error);
  268                 LINUX_SIGEMPTYSET(set);
  269                 set.__mask = mask;
  270         }
  271 
  272         error = linux_do_sigprocmask(td, args->how,
  273                                      args->mask ? &set : NULL,
  274                                      args->omask ? &oset : NULL);
  275 
  276         if (args->omask != NULL && !error) {
  277                 mask = oset.__mask;
  278                 error = copyout(&mask, args->omask, sizeof(l_osigset_t));
  279         }
  280 
  281         return (error);
  282 }
  283 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */
  284 
  285 int
  286 linux_rt_sigprocmask(struct thread *td, struct linux_rt_sigprocmask_args *args)
  287 {
  288         l_sigset_t set, oset;
  289         int error;
  290 
  291         if (args->sigsetsize != sizeof(l_sigset_t))
  292                 return (EINVAL);
  293 
  294         if (args->mask != NULL) {
  295                 error = copyin(args->mask, &set, sizeof(l_sigset_t));
  296                 if (error)
  297                         return (error);
  298         }
  299 
  300         error = linux_do_sigprocmask(td, args->how,
  301                                      args->mask ? &set : NULL,
  302                                      args->omask ? &oset : NULL);
  303 
  304         if (args->omask != NULL && !error) {
  305                 error = copyout(&oset, args->omask, sizeof(l_sigset_t));
  306         }
  307 
  308         return (error);
  309 }
  310 
  311 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
  312 int
  313 linux_sgetmask(struct thread *td, struct linux_sgetmask_args *args)
  314 {
  315         struct proc *p = td->td_proc;
  316         l_sigset_t mask;
  317 
  318         PROC_LOCK(p);
  319         bsd_to_linux_sigset(&td->td_sigmask, &mask);
  320         PROC_UNLOCK(p);
  321         td->td_retval[0] = mask.__mask;
  322         return (0);
  323 }
  324 
  325 int
  326 linux_ssetmask(struct thread *td, struct linux_ssetmask_args *args)
  327 {
  328         struct proc *p = td->td_proc;
  329         l_sigset_t lset;
  330         sigset_t bset;
  331 
  332         PROC_LOCK(p);
  333         bsd_to_linux_sigset(&td->td_sigmask, &lset);
  334         td->td_retval[0] = lset.__mask;
  335         LINUX_SIGEMPTYSET(lset);
  336         lset.__mask = args->mask;
  337         linux_to_bsd_sigset(&lset, &bset);
  338         td->td_sigmask = bset;
  339         SIG_CANTMASK(td->td_sigmask);
  340         signotify(td);
  341         PROC_UNLOCK(p);
  342         return (0);
  343 }
  344 
  345 int
  346 linux_sigpending(struct thread *td, struct linux_sigpending_args *args)
  347 {
  348         struct proc *p = td->td_proc;
  349         sigset_t bset;
  350         l_sigset_t lset;
  351         l_osigset_t mask;
  352 
  353         PROC_LOCK(p);
  354         bset = p->p_siglist;
  355         SIGSETOR(bset, td->td_siglist);
  356         SIGSETAND(bset, td->td_sigmask);
  357         PROC_UNLOCK(p);
  358         bsd_to_linux_sigset(&bset, &lset);
  359         mask = lset.__mask;
  360         return (copyout(&mask, args->mask, sizeof(mask)));
  361 }
  362 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */
  363 
  364 /*
  365  * MPSAFE
  366  */
  367 int
  368 linux_rt_sigpending(struct thread *td, struct linux_rt_sigpending_args *args)
  369 {
  370         struct proc *p = td->td_proc;
  371         sigset_t bset;
  372         l_sigset_t lset;
  373 
  374         if (args->sigsetsize > sizeof(lset))
  375                 return (EINVAL);
  376                 /* NOT REACHED */
  377 
  378         PROC_LOCK(p);
  379         bset = p->p_siglist;
  380         SIGSETOR(bset, td->td_siglist);
  381         SIGSETAND(bset, td->td_sigmask);
  382         PROC_UNLOCK(p);
  383         bsd_to_linux_sigset(&bset, &lset);
  384         return (copyout(&lset, args->set, args->sigsetsize));
  385 }
  386 
  387 /*
  388  * MPSAFE
  389  */
  390 int
  391 linux_rt_sigtimedwait(struct thread *td,
  392         struct linux_rt_sigtimedwait_args *args)
  393 {
  394         int error, sig;
  395         l_timeval ltv;
  396         struct timeval tv;
  397         struct timespec ts, *tsa;
  398         l_sigset_t lset;
  399         sigset_t bset;
  400         l_siginfo_t linfo;
  401         ksiginfo_t info;
  402 
  403         if (args->sigsetsize != sizeof(l_sigset_t))
  404                 return (EINVAL);
  405 
  406         if ((error = copyin(args->mask, &lset, sizeof(lset))))
  407                 return (error);
  408         linux_to_bsd_sigset(&lset, &bset);
  409 
  410         tsa = NULL;
  411         if (args->timeout) {
  412                 if ((error = copyin(args->timeout, &ltv, sizeof(ltv))))
  413                         return (error);
  414                 tv.tv_sec = (long)ltv.tv_sec;
  415                 tv.tv_usec = (suseconds_t)ltv.tv_usec;
  416                 if (itimerfix(&tv)) {
  417                         /*
  418                          * The timeout was invalid. Convert it to something
  419                          * valid that will act as it does under Linux.
  420                          */
  421                         tv.tv_sec += tv.tv_usec / 1000000;
  422                         tv.tv_usec %= 1000000;
  423                         if (tv.tv_usec < 0) {
  424                                 tv.tv_sec -= 1;
  425                                 tv.tv_usec += 1000000;
  426                         }
  427                         if (tv.tv_sec < 0)
  428                                 timevalclear(&tv);
  429                 }
  430                 TIMEVAL_TO_TIMESPEC(&tv, &ts);
  431                 tsa = &ts;
  432         }
  433         error = kern_sigtimedwait(td, bset, &info, tsa);
  434         if (error)
  435                 return (error);
  436 
  437         sig = bsd_to_linux_signal(info.ksi_signo);
  438 
  439         if (args->ptr) {
  440                 memset(&linfo, 0, sizeof(linfo));
  441                 ksiginfo_to_lsiginfo(&info, &linfo, sig);
  442                 error = copyout(&linfo, args->ptr, sizeof(linfo));
  443         }
  444         if (error == 0)
  445                 td->td_retval[0] = sig;
  446 
  447         return (error);
  448 }
  449 
  450 int
  451 linux_kill(struct thread *td, struct linux_kill_args *args)
  452 {
  453         int l_signum;
  454 
  455         /*
  456          * Allow signal 0 as a means to check for privileges
  457          */
  458         if (!LINUX_SIG_VALID(args->signum) && args->signum != 0)
  459                 return (EINVAL);
  460 
  461         if (args->signum > 0)
  462                 l_signum = linux_to_bsd_signal(args->signum);
  463         else
  464                 l_signum = 0;
  465 
  466         return (kern_kill(td, args->pid, l_signum));
  467 }
  468 
  469 static int
  470 linux_do_tkill(struct thread *td, struct thread *tdt, ksiginfo_t *ksi)
  471 {
  472         struct proc *p;
  473         int error;
  474 
  475         p = tdt->td_proc;
  476         AUDIT_ARG_SIGNUM(ksi->ksi_signo);
  477         AUDIT_ARG_PID(p->p_pid);
  478         AUDIT_ARG_PROCESS(p);
  479 
  480         error = p_cansignal(td, p, ksi->ksi_signo);
  481         if (error != 0 || ksi->ksi_signo == 0)
  482                 goto out;
  483 
  484         tdksignal(tdt, ksi->ksi_signo, ksi);
  485 
  486 out:
  487         PROC_UNLOCK(p);
  488         return (error);
  489 }
  490 
  491 int
  492 linux_tgkill(struct thread *td, struct linux_tgkill_args *args)
  493 {
  494         struct thread *tdt;
  495         ksiginfo_t ksi;
  496         int sig;
  497 
  498         if (args->pid <= 0 || args->tgid <=0)
  499                 return (EINVAL);
  500 
  501         /*
  502          * Allow signal 0 as a means to check for privileges
  503          */
  504         if (!LINUX_SIG_VALID(args->sig) && args->sig != 0)
  505                 return (EINVAL);
  506 
  507         if (args->sig > 0)
  508                 sig = linux_to_bsd_signal(args->sig);
  509         else
  510                 sig = 0;
  511 
  512         tdt = linux_tdfind(td, args->pid, args->tgid);
  513         if (tdt == NULL)
  514                 return (ESRCH);
  515 
  516         ksiginfo_init(&ksi);
  517         ksi.ksi_signo = sig;
  518         ksi.ksi_code = SI_LWP;
  519         ksi.ksi_errno = 0;
  520         ksi.ksi_pid = td->td_proc->p_pid;
  521         ksi.ksi_uid = td->td_proc->p_ucred->cr_ruid;
  522         return (linux_do_tkill(td, tdt, &ksi));
  523 }
  524 
  525 /*
  526  * Deprecated since 2.5.75. Replaced by tgkill().
  527  */
  528 int
  529 linux_tkill(struct thread *td, struct linux_tkill_args *args)
  530 {
  531         struct thread *tdt;
  532         ksiginfo_t ksi;
  533         int sig;
  534 
  535         if (args->tid <= 0)
  536                 return (EINVAL);
  537 
  538         if (!LINUX_SIG_VALID(args->sig))
  539                 return (EINVAL);
  540 
  541         sig = linux_to_bsd_signal(args->sig);
  542 
  543         tdt = linux_tdfind(td, args->tid, -1);
  544         if (tdt == NULL)
  545                 return (ESRCH);
  546 
  547         ksiginfo_init(&ksi);
  548         ksi.ksi_signo = sig;
  549         ksi.ksi_code = SI_LWP;
  550         ksi.ksi_errno = 0;
  551         ksi.ksi_pid = td->td_proc->p_pid;
  552         ksi.ksi_uid = td->td_proc->p_ucred->cr_ruid;
  553         return (linux_do_tkill(td, tdt, &ksi));
  554 }
  555 
  556 void
  557 ksiginfo_to_lsiginfo(const ksiginfo_t *ksi, l_siginfo_t *lsi, l_int sig)
  558 {
  559 
  560         siginfo_to_lsiginfo(&ksi->ksi_info, lsi, sig);
  561 }
  562 
  563 static void
  564 sicode_to_lsicode(int si_code, int *lsi_code)
  565 {
  566 
  567         switch (si_code) {
  568         case SI_USER:
  569                 *lsi_code = LINUX_SI_USER;
  570                 break;
  571         case SI_KERNEL:
  572                 *lsi_code = LINUX_SI_KERNEL;
  573                 break;
  574         case SI_QUEUE:
  575                 *lsi_code = LINUX_SI_QUEUE;
  576                 break;
  577         case SI_TIMER:
  578                 *lsi_code = LINUX_SI_TIMER;
  579                 break;
  580         case SI_MESGQ:
  581                 *lsi_code = LINUX_SI_MESGQ;
  582                 break;
  583         case SI_ASYNCIO:
  584                 *lsi_code = LINUX_SI_ASYNCIO;
  585                 break;
  586         case SI_LWP:
  587                 *lsi_code = LINUX_SI_TKILL;
  588                 break;
  589         default:
  590                 *lsi_code = si_code;
  591                 break;
  592         }
  593 }
  594 
  595 void
  596 siginfo_to_lsiginfo(const siginfo_t *si, l_siginfo_t *lsi, l_int sig)
  597 {
  598 
  599         /* sig alredy converted */
  600         lsi->lsi_signo = sig;
  601         sicode_to_lsicode(si->si_code, &lsi->lsi_code);
  602 
  603         switch (si->si_code) {
  604         case SI_LWP:
  605                 lsi->lsi_pid = si->si_pid;
  606                 lsi->lsi_uid = si->si_uid;
  607                 break;
  608 
  609         case SI_TIMER:
  610                 lsi->lsi_int = si->si_value.sival_int;
  611                 lsi->lsi_ptr = PTROUT(si->si_value.sival_ptr);
  612                 lsi->lsi_tid = si->si_timerid;
  613                 break;
  614 
  615         case SI_QUEUE:
  616                 lsi->lsi_pid = si->si_pid;
  617                 lsi->lsi_uid = si->si_uid;
  618                 lsi->lsi_ptr = PTROUT(si->si_value.sival_ptr);
  619                 break;
  620 
  621         case SI_ASYNCIO:
  622                 lsi->lsi_int = si->si_value.sival_int;
  623                 lsi->lsi_ptr = PTROUT(si->si_value.sival_ptr);
  624                 break;
  625 
  626         default:
  627                 switch (sig) {
  628                 case LINUX_SIGPOLL:
  629                         /* XXX si_fd? */
  630                         lsi->lsi_band = si->si_band;
  631                         break;
  632 
  633                 case LINUX_SIGCHLD:
  634                         lsi->lsi_errno = 0;
  635                         lsi->lsi_pid = si->si_pid;
  636                         lsi->lsi_uid = si->si_uid;
  637 
  638                         if (si->si_code == CLD_STOPPED)
  639                                 lsi->lsi_status = bsd_to_linux_signal(si->si_status);
  640                         else if (si->si_code == CLD_CONTINUED)
  641                                 lsi->lsi_status = bsd_to_linux_signal(SIGCONT);
  642                         else
  643                                 lsi->lsi_status = si->si_status;
  644                         break;
  645 
  646                 case LINUX_SIGBUS:
  647                 case LINUX_SIGILL:
  648                 case LINUX_SIGFPE:
  649                 case LINUX_SIGSEGV:
  650                         lsi->lsi_addr = PTROUT(si->si_addr);
  651                         break;
  652 
  653                 default:
  654                         lsi->lsi_pid = si->si_pid;
  655                         lsi->lsi_uid = si->si_uid;
  656                         if (sig >= LINUX_SIGRTMIN) {
  657                                 lsi->lsi_int = si->si_value.sival_int;
  658                                 lsi->lsi_ptr = PTROUT(si->si_value.sival_ptr);
  659                         }
  660                         break;
  661                 }
  662                 break;
  663         }
  664 }
  665 
  666 void
  667 lsiginfo_to_ksiginfo(const l_siginfo_t *lsi, ksiginfo_t *ksi, int sig)
  668 {
  669 
  670         ksi->ksi_signo = sig;
  671         ksi->ksi_code = lsi->lsi_code;  /* XXX. Convert. */
  672         ksi->ksi_pid = lsi->lsi_pid;
  673         ksi->ksi_uid = lsi->lsi_uid;
  674         ksi->ksi_status = lsi->lsi_status;
  675         ksi->ksi_addr = PTRIN(lsi->lsi_addr);
  676         ksi->ksi_info.si_value.sival_int = lsi->lsi_int;
  677 }
  678 
  679 int
  680 linux_rt_sigqueueinfo(struct thread *td, struct linux_rt_sigqueueinfo_args *args)
  681 {
  682         l_siginfo_t linfo;
  683         struct proc *p;
  684         ksiginfo_t ksi;
  685         int error;
  686         int sig;
  687 
  688         if (!LINUX_SIG_VALID(args->sig))
  689                 return (EINVAL);
  690 
  691         error = copyin(args->info, &linfo, sizeof(linfo));
  692         if (error != 0)
  693                 return (error);
  694 
  695         if (linfo.lsi_code >= 0)
  696                 return (EPERM);
  697 
  698         sig = linux_to_bsd_signal(args->sig);
  699 
  700         error = ESRCH;
  701         if ((p = pfind_any(args->pid)) != NULL) {
  702                 error = p_cansignal(td, p, sig);
  703                 if (error != 0) {
  704                         PROC_UNLOCK(p);
  705                         return (error);
  706                 }
  707 
  708                 ksiginfo_init(&ksi);
  709                 lsiginfo_to_ksiginfo(&linfo, &ksi, sig);
  710                 error = tdsendsignal(p, NULL, sig, &ksi);
  711                 PROC_UNLOCK(p);
  712         }
  713 
  714         return (error);
  715 }
  716 
  717 int
  718 linux_rt_tgsigqueueinfo(struct thread *td, struct linux_rt_tgsigqueueinfo_args *args)
  719 {
  720         l_siginfo_t linfo;
  721         struct thread *tds;
  722         ksiginfo_t ksi;
  723         int error;
  724         int sig;
  725 
  726         if (!LINUX_SIG_VALID(args->sig))
  727                 return (EINVAL);
  728 
  729         error = copyin(args->uinfo, &linfo, sizeof(linfo));
  730         if (error != 0)
  731                 return (error);
  732 
  733         if (linfo.lsi_code >= 0)
  734                 return (EPERM);
  735 
  736         tds = linux_tdfind(td, args->tid, args->tgid);
  737         if (tds == NULL)
  738                 return (ESRCH);
  739 
  740         sig = linux_to_bsd_signal(args->sig);
  741         ksiginfo_init(&ksi);
  742         lsiginfo_to_ksiginfo(&linfo, &ksi, sig);
  743         return (linux_do_tkill(td, tds, &ksi));
  744 }
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FreeBSD/Linux Kernel Cross Reference sys/compat/linux/linux_signal.c

FreeBSD/Linux Kernel Cross Reference
sys/compat/linux/linux_signal.c
