The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    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 without 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 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD: releng/11.1/sys/compat/linux/linux_ipc.c 333372 2018-05-08 17:14:54Z gordon $");
   31 
   32 #include <sys/param.h>
   33 #include <sys/systm.h>
   34 #include <sys/syscallsubr.h>
   35 #include <sys/sysproto.h>
   36 #include <sys/proc.h>
   37 #include <sys/limits.h>
   38 #include <sys/msg.h>
   39 #include <sys/sem.h>
   40 #include <sys/shm.h>
   41 #include <sys/stat.h>
   42 
   43 #include "opt_compat.h"
   44 
   45 #ifdef COMPAT_LINUX32
   46 #include <machine/../linux32/linux.h>
   47 #include <machine/../linux32/linux32_proto.h>
   48 #else
   49 #include <machine/../linux/linux.h>
   50 #include <machine/../linux/linux_proto.h>
   51 #endif
   52 #include <compat/linux/linux_ipc.h>
   53 #include <compat/linux/linux_ipc64.h>
   54 #include <compat/linux/linux_util.h>
   55 
   56 /*
   57  * old, pre 2.4 kernel
   58  */
   59 struct l_ipc_perm {
   60         l_key_t         key;
   61         l_uid16_t       uid;
   62         l_gid16_t       gid;
   63         l_uid16_t       cuid;
   64         l_gid16_t       cgid;
   65         l_ushort        mode;
   66         l_ushort        seq;
   67 };
   68 
   69 struct l_seminfo {
   70         l_int semmap;
   71         l_int semmni;
   72         l_int semmns;
   73         l_int semmnu;
   74         l_int semmsl;
   75         l_int semopm;
   76         l_int semume;
   77         l_int semusz;
   78         l_int semvmx;
   79         l_int semaem;
   80 };
   81 
   82 struct l_shminfo {
   83         l_int shmmax;
   84         l_int shmmin;
   85         l_int shmmni;
   86         l_int shmseg;
   87         l_int shmall;
   88 };
   89 
   90 struct l_shm_info {
   91         l_int used_ids;
   92         l_ulong shm_tot;  /* total allocated shm */
   93         l_ulong shm_rss;  /* total resident shm */
   94         l_ulong shm_swp;  /* total swapped shm */
   95         l_ulong swap_attempts;
   96         l_ulong swap_successes;
   97 };
   98 
   99 struct l_msginfo {
  100         l_int msgpool;
  101         l_int msgmap;
  102         l_int msgmax;
  103         l_int msgmnb;
  104         l_int msgmni;
  105         l_int msgssz;
  106         l_int msgtql;
  107         l_ushort msgseg;
  108 };
  109 
  110 static void
  111 bsd_to_linux_shminfo( struct shminfo *bpp, struct l_shminfo64 *lpp)
  112 {
  113 
  114         lpp->shmmax = bpp->shmmax;
  115         lpp->shmmin = bpp->shmmin;
  116         lpp->shmmni = bpp->shmmni;
  117         lpp->shmseg = bpp->shmseg;
  118         lpp->shmall = bpp->shmall;
  119 }
  120 
  121 static void
  122 bsd_to_linux_shm_info( struct shm_info *bpp, struct l_shm_info *lpp)
  123 {
  124 
  125         lpp->used_ids = bpp->used_ids;
  126         lpp->shm_tot = bpp->shm_tot;
  127         lpp->shm_rss = bpp->shm_rss;
  128         lpp->shm_swp = bpp->shm_swp;
  129         lpp->swap_attempts = bpp->swap_attempts;
  130         lpp->swap_successes = bpp->swap_successes;
  131 }
  132 
  133 static void
  134 linux_to_bsd_ipc_perm(struct l_ipc64_perm *lpp, struct ipc_perm *bpp)
  135 {
  136 
  137         bpp->key = lpp->key;
  138         bpp->uid = lpp->uid;
  139         bpp->gid = lpp->gid;
  140         bpp->cuid = lpp->cuid;
  141         bpp->cgid = lpp->cgid;
  142         bpp->mode = lpp->mode;
  143         bpp->seq = lpp->seq;
  144 }
  145 
  146 static void
  147 bsd_to_linux_ipc_perm(struct ipc_perm *bpp, struct l_ipc64_perm *lpp)
  148 {
  149 
  150         lpp->key = bpp->key;
  151         lpp->uid = bpp->uid;
  152         lpp->gid = bpp->gid;
  153         lpp->cuid = bpp->cuid;
  154         lpp->cgid = bpp->cgid;
  155         lpp->mode = bpp->mode & (S_IRWXU|S_IRWXG|S_IRWXO);
  156         lpp->seq = bpp->seq;
  157 }
  158 
  159 struct l_msqid_ds {
  160         struct l_ipc_perm       msg_perm;
  161         l_uintptr_t             msg_first;      /* first message on queue,unused */
  162         l_uintptr_t             msg_last;       /* last message in queue,unused */
  163         l_time_t                msg_stime;      /* last msgsnd time */
  164         l_time_t                msg_rtime;      /* last msgrcv time */
  165         l_time_t                msg_ctime;      /* last change time */
  166         l_ulong                 msg_lcbytes;    /* Reuse junk fields for 32 bit */
  167         l_ulong                 msg_lqbytes;    /* ditto */
  168         l_ushort                msg_cbytes;     /* current number of bytes on queue */
  169         l_ushort                msg_qnum;       /* number of messages in queue */
  170         l_ushort                msg_qbytes;     /* max number of bytes on queue */
  171         l_pid_t                 msg_lspid;      /* pid of last msgsnd */
  172         l_pid_t                 msg_lrpid;      /* last receive pid */
  173 };
  174 
  175 struct l_semid_ds {
  176         struct l_ipc_perm       sem_perm;
  177         l_time_t                sem_otime;
  178         l_time_t                sem_ctime;
  179         l_uintptr_t             sem_base;
  180         l_uintptr_t             sem_pending;
  181         l_uintptr_t             sem_pending_last;
  182         l_uintptr_t             undo;
  183         l_ushort                sem_nsems;
  184 };
  185 
  186 struct l_shmid_ds {
  187         struct l_ipc_perm       shm_perm;
  188         l_int                   shm_segsz;
  189         l_time_t                shm_atime;
  190         l_time_t                shm_dtime;
  191         l_time_t                shm_ctime;
  192         l_ushort                shm_cpid;
  193         l_ushort                shm_lpid;
  194         l_short                 shm_nattch;
  195         l_ushort                private1;
  196         l_uintptr_t             private2;
  197         l_uintptr_t             private3;
  198 };
  199 
  200 static void
  201 linux_to_bsd_semid_ds(struct l_semid64_ds *lsp, struct semid_ds *bsp)
  202 {
  203 
  204         linux_to_bsd_ipc_perm(&lsp->sem_perm, &bsp->sem_perm);
  205         bsp->sem_otime = lsp->sem_otime;
  206         bsp->sem_ctime = lsp->sem_ctime;
  207         bsp->sem_nsems = lsp->sem_nsems;
  208 }
  209 
  210 static void
  211 bsd_to_linux_semid_ds(struct semid_ds *bsp, struct l_semid64_ds *lsp)
  212 {
  213 
  214         bsd_to_linux_ipc_perm(&bsp->sem_perm, &lsp->sem_perm);
  215         lsp->sem_otime = bsp->sem_otime;
  216         lsp->sem_ctime = bsp->sem_ctime;
  217         lsp->sem_nsems = bsp->sem_nsems;
  218 }
  219 
  220 static void
  221 linux_to_bsd_shmid_ds(struct l_shmid64_ds *lsp, struct shmid_ds *bsp)
  222 {
  223 
  224         linux_to_bsd_ipc_perm(&lsp->shm_perm, &bsp->shm_perm);
  225         bsp->shm_segsz = lsp->shm_segsz;
  226         bsp->shm_lpid = lsp->shm_lpid;
  227         bsp->shm_cpid = lsp->shm_cpid;
  228         bsp->shm_nattch = lsp->shm_nattch;
  229         bsp->shm_atime = lsp->shm_atime;
  230         bsp->shm_dtime = lsp->shm_dtime;
  231         bsp->shm_ctime = lsp->shm_ctime;
  232 }
  233 
  234 static void
  235 bsd_to_linux_shmid_ds(struct shmid_ds *bsp, struct l_shmid64_ds *lsp)
  236 {
  237 
  238         bsd_to_linux_ipc_perm(&bsp->shm_perm, &lsp->shm_perm);
  239         lsp->shm_segsz = bsp->shm_segsz;
  240         lsp->shm_lpid = bsp->shm_lpid;
  241         lsp->shm_cpid = bsp->shm_cpid;
  242         lsp->shm_nattch = bsp->shm_nattch;
  243         lsp->shm_atime = bsp->shm_atime;
  244         lsp->shm_dtime = bsp->shm_dtime;
  245         lsp->shm_ctime = bsp->shm_ctime;
  246 }
  247 
  248 static void
  249 linux_to_bsd_msqid_ds(struct l_msqid64_ds *lsp, struct msqid_ds *bsp)
  250 {
  251 
  252         linux_to_bsd_ipc_perm(&lsp->msg_perm, &bsp->msg_perm);
  253         bsp->msg_cbytes = lsp->msg_cbytes;
  254         bsp->msg_qnum = lsp->msg_qnum;
  255         bsp->msg_qbytes = lsp->msg_qbytes;
  256         bsp->msg_lspid = lsp->msg_lspid;
  257         bsp->msg_lrpid = lsp->msg_lrpid;
  258         bsp->msg_stime = lsp->msg_stime;
  259         bsp->msg_rtime = lsp->msg_rtime;
  260         bsp->msg_ctime = lsp->msg_ctime;
  261 }
  262 
  263 static void
  264 bsd_to_linux_msqid_ds(struct msqid_ds *bsp, struct l_msqid64_ds *lsp)
  265 {
  266 
  267         bsd_to_linux_ipc_perm(&bsp->msg_perm, &lsp->msg_perm);
  268         lsp->msg_cbytes = bsp->msg_cbytes;
  269         lsp->msg_qnum = bsp->msg_qnum;
  270         lsp->msg_qbytes = bsp->msg_qbytes;
  271         lsp->msg_lspid = bsp->msg_lspid;
  272         lsp->msg_lrpid = bsp->msg_lrpid;
  273         lsp->msg_stime = bsp->msg_stime;
  274         lsp->msg_rtime = bsp->msg_rtime;
  275         lsp->msg_ctime = bsp->msg_ctime;
  276 }
  277 
  278 static int
  279 linux_ipc64_perm_to_ipc_perm(struct l_ipc64_perm *in, struct l_ipc_perm *out)
  280 {
  281 
  282         out->key = in->key;
  283         out->uid = in->uid;
  284         out->gid = in->gid;
  285         out->cuid = in->cuid;
  286         out->cgid = in->cgid;
  287         out->mode = in->mode;
  288         out->seq = in->seq;
  289 
  290         /* Linux does not check overflow */
  291         if (out->uid != in->uid || out->gid != in->gid ||
  292             out->cuid != in->cuid || out->cgid != in->cgid ||
  293             out->mode != in->mode)
  294                 return (EOVERFLOW);
  295         else
  296                 return (0);
  297 }
  298 
  299 static int
  300 linux_msqid_pullup(l_int ver, struct l_msqid64_ds *linux_msqid64, caddr_t uaddr)
  301 {
  302         struct l_msqid_ds linux_msqid;
  303         int error;
  304 
  305         if (ver == LINUX_IPC_64 || SV_CURPROC_FLAG(SV_LP64))
  306                 return (copyin(uaddr, linux_msqid64, sizeof(*linux_msqid64)));
  307         else {
  308                 error = copyin(uaddr, &linux_msqid, sizeof(linux_msqid));
  309                 if (error != 0)
  310                         return (error);
  311 
  312                 bzero(linux_msqid64, sizeof(*linux_msqid64));
  313 
  314                 linux_msqid64->msg_perm.uid = linux_msqid.msg_perm.uid;
  315                 linux_msqid64->msg_perm.gid = linux_msqid.msg_perm.gid;
  316                 linux_msqid64->msg_perm.mode = linux_msqid.msg_perm.mode;
  317                 if (linux_msqid.msg_qbytes == 0)
  318                         linux_msqid64->msg_qbytes = linux_msqid.msg_lqbytes;
  319                 else
  320                         linux_msqid64->msg_qbytes = linux_msqid.msg_qbytes;
  321                 return (0);
  322         }
  323 }
  324 
  325 static int
  326 linux_msqid_pushdown(l_int ver, struct l_msqid64_ds *linux_msqid64, caddr_t uaddr)
  327 {
  328         struct l_msqid_ds linux_msqid;
  329         int error;
  330 
  331         if (ver == LINUX_IPC_64 || SV_CURPROC_FLAG(SV_LP64))
  332                 return (copyout(linux_msqid64, uaddr, sizeof(*linux_msqid64)));
  333         else {
  334                 bzero(&linux_msqid, sizeof(linux_msqid));
  335 
  336                 error = linux_ipc64_perm_to_ipc_perm(&linux_msqid64->msg_perm,
  337                     &linux_msqid.msg_perm);
  338                 if (error != 0)
  339                         return (error);
  340 
  341                 linux_msqid.msg_stime = linux_msqid64->msg_stime;
  342                 linux_msqid.msg_rtime = linux_msqid64->msg_rtime;
  343                 linux_msqid.msg_ctime = linux_msqid64->msg_ctime;
  344 
  345                 if (linux_msqid64->msg_cbytes > USHRT_MAX)
  346                         linux_msqid.msg_cbytes = USHRT_MAX;
  347                 else
  348                         linux_msqid.msg_cbytes = linux_msqid64->msg_cbytes;
  349                 linux_msqid.msg_lcbytes = linux_msqid64->msg_cbytes;
  350                 if (linux_msqid64->msg_qnum > USHRT_MAX)
  351                         linux_msqid.msg_qnum = USHRT_MAX;
  352                 else
  353                         linux_msqid.msg_qnum = linux_msqid64->msg_qnum;
  354                 if (linux_msqid64->msg_qbytes > USHRT_MAX)
  355                         linux_msqid.msg_qbytes = USHRT_MAX;
  356                 else
  357                         linux_msqid.msg_qbytes = linux_msqid64->msg_qbytes;
  358                 linux_msqid.msg_lqbytes = linux_msqid64->msg_qbytes;
  359                 linux_msqid.msg_lspid = linux_msqid64->msg_lspid;
  360                 linux_msqid.msg_lrpid = linux_msqid64->msg_lrpid;
  361 
  362                 /* Linux does not check overflow */
  363                 if (linux_msqid.msg_stime != linux_msqid64->msg_stime ||
  364                     linux_msqid.msg_rtime != linux_msqid64->msg_rtime ||
  365                     linux_msqid.msg_ctime != linux_msqid64->msg_ctime)
  366                         return (EOVERFLOW);
  367 
  368                 return (copyout(&linux_msqid, uaddr, sizeof(linux_msqid)));
  369         }
  370 }
  371 
  372 static int
  373 linux_semid_pullup(l_int ver, struct l_semid64_ds *linux_semid64, caddr_t uaddr)
  374 {
  375         struct l_semid_ds linux_semid;
  376         int error;
  377 
  378         if (ver == LINUX_IPC_64 || SV_CURPROC_FLAG(SV_LP64))
  379                 return (copyin(uaddr, linux_semid64, sizeof(*linux_semid64)));
  380         else {
  381                 error = copyin(uaddr, &linux_semid, sizeof(linux_semid));
  382                 if (error != 0)
  383                         return (error);
  384 
  385                 bzero(linux_semid64, sizeof(*linux_semid64));
  386 
  387                 linux_semid64->sem_perm.uid = linux_semid.sem_perm.uid;
  388                 linux_semid64->sem_perm.gid = linux_semid.sem_perm.gid;
  389                 linux_semid64->sem_perm.mode = linux_semid.sem_perm.mode;
  390                 return (0);
  391         }
  392 }
  393 
  394 static int
  395 linux_semid_pushdown(l_int ver, struct l_semid64_ds *linux_semid64, caddr_t uaddr)
  396 {
  397         struct l_semid_ds linux_semid;
  398         int error;
  399 
  400         if (ver == LINUX_IPC_64 || SV_CURPROC_FLAG(SV_LP64))
  401                 return (copyout(linux_semid64, uaddr, sizeof(*linux_semid64)));
  402         else {
  403                 bzero(&linux_semid, sizeof(linux_semid));
  404 
  405                 error = linux_ipc64_perm_to_ipc_perm(&linux_semid64->sem_perm,
  406                     &linux_semid.sem_perm);
  407                 if (error != 0)
  408                         return (error);
  409 
  410                 linux_semid.sem_otime = linux_semid64->sem_otime;
  411                 linux_semid.sem_ctime = linux_semid64->sem_ctime;
  412                 linux_semid.sem_nsems = linux_semid64->sem_nsems;
  413 
  414                 /* Linux does not check overflow */
  415                 if (linux_semid.sem_otime != linux_semid64->sem_otime ||
  416                     linux_semid.sem_ctime != linux_semid64->sem_ctime ||
  417                     linux_semid.sem_nsems != linux_semid64->sem_nsems)
  418                         return (EOVERFLOW);
  419 
  420                 return (copyout(&linux_semid, uaddr, sizeof(linux_semid)));
  421         }
  422 }
  423 
  424 static int
  425 linux_shmid_pullup(l_int ver, struct l_shmid64_ds *linux_shmid64, caddr_t uaddr)
  426 {
  427         struct l_shmid_ds linux_shmid;
  428         int error;
  429 
  430         if (ver == LINUX_IPC_64 || SV_CURPROC_FLAG(SV_LP64))
  431                 return (copyin(uaddr, linux_shmid64, sizeof(*linux_shmid64)));
  432         else {
  433                 error = copyin(uaddr, &linux_shmid, sizeof(linux_shmid));
  434                 if (error != 0)
  435                         return (error);
  436 
  437                 bzero(linux_shmid64, sizeof(*linux_shmid64));
  438 
  439                 linux_shmid64->shm_perm.uid = linux_shmid.shm_perm.uid;
  440                 linux_shmid64->shm_perm.gid = linux_shmid.shm_perm.gid;
  441                 linux_shmid64->shm_perm.mode = linux_shmid.shm_perm.mode;
  442                 return (0);
  443         }
  444 }
  445 
  446 static int
  447 linux_shmid_pushdown(l_int ver, struct l_shmid64_ds *linux_shmid64, caddr_t uaddr)
  448 {
  449         struct l_shmid_ds linux_shmid;
  450         int error;
  451 
  452         if (ver == LINUX_IPC_64 || SV_CURPROC_FLAG(SV_LP64))
  453                 return (copyout(linux_shmid64, uaddr, sizeof(*linux_shmid64)));
  454         else {
  455                 bzero(&linux_shmid, sizeof(linux_shmid));
  456 
  457                 error = linux_ipc64_perm_to_ipc_perm(&linux_shmid64->shm_perm,
  458                     &linux_shmid.shm_perm);
  459                 if (error != 0)
  460                         return (error);
  461 
  462                 linux_shmid.shm_segsz = linux_shmid64->shm_segsz;
  463                 linux_shmid.shm_atime = linux_shmid64->shm_atime;
  464                 linux_shmid.shm_dtime = linux_shmid64->shm_dtime;
  465                 linux_shmid.shm_ctime = linux_shmid64->shm_ctime;
  466                 linux_shmid.shm_cpid = linux_shmid64->shm_cpid;
  467                 linux_shmid.shm_lpid = linux_shmid64->shm_lpid;
  468                 linux_shmid.shm_nattch = linux_shmid64->shm_nattch;
  469 
  470                 /* Linux does not check overflow */
  471                 if (linux_shmid.shm_segsz != linux_shmid64->shm_segsz ||
  472                     linux_shmid.shm_atime != linux_shmid64->shm_atime ||
  473                     linux_shmid.shm_dtime != linux_shmid64->shm_dtime ||
  474                     linux_shmid.shm_ctime != linux_shmid64->shm_ctime ||
  475                     linux_shmid.shm_cpid != linux_shmid64->shm_cpid ||
  476                     linux_shmid.shm_lpid != linux_shmid64->shm_lpid ||
  477                     linux_shmid.shm_nattch != linux_shmid64->shm_nattch)
  478                         return (EOVERFLOW);
  479 
  480                 return (copyout(&linux_shmid, uaddr, sizeof(linux_shmid)));
  481         }
  482 }
  483 
  484 static int
  485 linux_shminfo_pushdown(l_int ver, struct l_shminfo64 *linux_shminfo64,
  486     caddr_t uaddr)
  487 {
  488         struct l_shminfo linux_shminfo;
  489 
  490         if (ver == LINUX_IPC_64 || SV_CURPROC_FLAG(SV_LP64))
  491                 return (copyout(linux_shminfo64, uaddr,
  492                     sizeof(*linux_shminfo64)));
  493         else {
  494                 bzero(&linux_shminfo, sizeof(linux_shminfo));
  495 
  496                 linux_shminfo.shmmax = linux_shminfo64->shmmax;
  497                 linux_shminfo.shmmin = linux_shminfo64->shmmin;
  498                 linux_shminfo.shmmni = linux_shminfo64->shmmni;
  499                 linux_shminfo.shmseg = linux_shminfo64->shmseg;
  500                 linux_shminfo.shmall = linux_shminfo64->shmall;
  501 
  502                 return (copyout(&linux_shminfo, uaddr,
  503                     sizeof(linux_shminfo)));
  504         }
  505 }
  506 
  507 int
  508 linux_semop(struct thread *td, struct linux_semop_args *args)
  509 {
  510         struct semop_args /* {
  511         int     semid;
  512         struct  sembuf *sops;
  513         int             nsops;
  514         } */ bsd_args;
  515 
  516         if (args->nsops < 1 || args->semid < 0)
  517                 return (EINVAL);
  518         bsd_args.semid = args->semid;
  519         bsd_args.sops = PTRIN(args->tsops);
  520         bsd_args.nsops = args->nsops;
  521         return (sys_semop(td, &bsd_args));
  522 }
  523 
  524 int
  525 linux_semget(struct thread *td, struct linux_semget_args *args)
  526 {
  527         struct semget_args /* {
  528         key_t   key;
  529         int             nsems;
  530         int             semflg;
  531         } */ bsd_args;
  532 
  533         if (args->nsems < 0)
  534                 return (EINVAL);
  535         bsd_args.key = args->key;
  536         bsd_args.nsems = args->nsems;
  537         bsd_args.semflg = args->semflg;
  538         return (sys_semget(td, &bsd_args));
  539 }
  540 
  541 int
  542 linux_semctl(struct thread *td, struct linux_semctl_args *args)
  543 {
  544         struct l_semid64_ds linux_semid64;
  545         struct l_seminfo linux_seminfo;
  546         struct semid_ds semid;
  547         union semun semun;
  548         register_t rval;
  549         int cmd, error;
  550 
  551         memset(&linux_seminfo, 0, sizeof(linux_seminfo));
  552         memset(&linux_semid64, 0, sizeof(linux_semid64));
  553 
  554         switch (args->cmd & ~LINUX_IPC_64) {
  555         case LINUX_IPC_RMID:
  556                 cmd = IPC_RMID;
  557                 break;
  558         case LINUX_GETNCNT:
  559                 cmd = GETNCNT;
  560                 break;
  561         case LINUX_GETPID:
  562                 cmd = GETPID;
  563                 break;
  564         case LINUX_GETVAL:
  565                 cmd = GETVAL;
  566                 break;
  567         case LINUX_GETZCNT:
  568                 cmd = GETZCNT;
  569                 break;
  570         case LINUX_SETVAL:
  571                 cmd = SETVAL;
  572                 semun.val = args->arg.val;
  573                 break;
  574         case LINUX_IPC_SET:
  575                 cmd = IPC_SET;
  576                 error = linux_semid_pullup(args->cmd & LINUX_IPC_64,
  577                     &linux_semid64, PTRIN(args->arg.buf));
  578                 if (error != 0)
  579                         return (error);
  580                 linux_to_bsd_semid_ds(&linux_semid64, &semid);
  581                 semun.buf = &semid;
  582                 return (kern_semctl(td, args->semid, args->semnum, cmd, &semun,
  583                     td->td_retval));
  584         case LINUX_IPC_STAT:
  585                 cmd = IPC_STAT;
  586                 semun.buf = &semid;
  587                 error = kern_semctl(td, args->semid, args->semnum, cmd, &semun,
  588                     &rval);
  589                 if (error != 0)
  590                         return (error);
  591                 bsd_to_linux_semid_ds(&semid, &linux_semid64);
  592                 return (linux_semid_pushdown(args->cmd & LINUX_IPC_64,
  593                     &linux_semid64, PTRIN(args->arg.buf)));
  594         case LINUX_SEM_STAT:
  595                 cmd = SEM_STAT;
  596                 semun.buf = &semid;
  597                 error = kern_semctl(td, args->semid, args->semnum, cmd, &semun,
  598                     &rval);
  599                 if (error != 0)
  600                         return (error);
  601                 bsd_to_linux_semid_ds(&semid, &linux_semid64);
  602                 error = linux_semid_pushdown(args->cmd & LINUX_IPC_64,
  603                     &linux_semid64, PTRIN(args->arg.buf));
  604                 if (error == 0)
  605                         td->td_retval[0] = rval;
  606                 return (error);
  607         case LINUX_IPC_INFO:
  608         case LINUX_SEM_INFO:
  609                 bcopy(&seminfo, &linux_seminfo.semmni, sizeof(linux_seminfo) -
  610                     sizeof(linux_seminfo.semmap) );
  611                 /*
  612                  * Linux does not use the semmap field but populates it with
  613                  * the defined value from SEMMAP, which really is redefined to
  614                  * SEMMNS, which they define as SEMMNI * SEMMSL.  Try to
  615                  * simulate this returning our dynamic semmns value.
  616                  */
  617                 linux_seminfo.semmap = linux_seminfo.semmns;
  618 /* XXX BSD equivalent?
  619 #define used_semids 10
  620 #define used_sems 10
  621                 linux_seminfo.semusz = used_semids;
  622                 linux_seminfo.semaem = used_sems;
  623 */
  624                 error = copyout(&linux_seminfo,
  625                     PTRIN(args->arg.buf), sizeof(linux_seminfo));
  626                 if (error != 0)
  627                         return (error);
  628                 /*
  629                  * TODO: Linux return the last assigned id, not the semmni.
  630                  */
  631                 td->td_retval[0] = seminfo.semmni;
  632                 return (0);
  633         case LINUX_GETALL:
  634                 cmd = GETALL;
  635                 semun.array = PTRIN(args->arg.array);
  636                 break;
  637         case LINUX_SETALL:
  638                 cmd = SETALL;
  639                 semun.array = PTRIN(args->arg.array);
  640                 break;
  641         default:
  642                 linux_msg(td, "ipc type %d is not implemented",
  643                   args->cmd & ~LINUX_IPC_64);
  644                 return (EINVAL);
  645         }
  646         return (kern_semctl(td, args->semid, args->semnum, cmd, &semun,
  647             td->td_retval));
  648 }
  649 
  650 int
  651 linux_msgsnd(struct thread *td, struct linux_msgsnd_args *args)
  652 {
  653         const void *msgp;
  654         long mtype;
  655         l_long lmtype;
  656         int error;
  657 
  658         if ((l_long)args->msgsz < 0 || args->msgsz > (l_long)msginfo.msgmax)
  659                 return (EINVAL);
  660         msgp = PTRIN(args->msgp);
  661         if ((error = copyin(msgp, &lmtype, sizeof(lmtype))) != 0)
  662                 return (error);
  663         mtype = (long)lmtype;
  664         return (kern_msgsnd(td, args->msqid,
  665             (const char *)msgp + sizeof(lmtype),
  666             args->msgsz, args->msgflg, mtype));
  667 }
  668 
  669 int
  670 linux_msgrcv(struct thread *td, struct linux_msgrcv_args *args)
  671 {
  672         void *msgp;
  673         long mtype;
  674         l_long lmtype;
  675         int error;
  676 
  677         if ((l_long)args->msgsz < 0 || args->msgsz > (l_long)msginfo.msgmax)
  678                 return (EINVAL);
  679         msgp = PTRIN(args->msgp);
  680         if ((error = kern_msgrcv(td, args->msqid,
  681             (char *)msgp + sizeof(lmtype), args->msgsz,
  682             args->msgtyp, args->msgflg, &mtype)) != 0)
  683                 return (error);
  684         lmtype = (l_long)mtype;
  685         return (copyout(&lmtype, msgp, sizeof(lmtype)));
  686 }
  687 
  688 int
  689 linux_msgget(struct thread *td, struct linux_msgget_args *args)
  690 {
  691         struct msgget_args /* {
  692                 key_t   key;
  693                 int     msgflg;
  694         } */ bsd_args;
  695 
  696         bsd_args.key = args->key;
  697         bsd_args.msgflg = args->msgflg;
  698         return (sys_msgget(td, &bsd_args));
  699 }
  700 
  701 int
  702 linux_msgctl(struct thread *td, struct linux_msgctl_args *args)
  703 {
  704         int error, bsd_cmd;
  705         struct l_msqid64_ds linux_msqid64;
  706         struct msqid_ds bsd_msqid;
  707 
  708         memset(&linux_msqid64, 0, sizeof(linux_msqid64));
  709 
  710         bsd_cmd = args->cmd & ~LINUX_IPC_64;
  711         switch (bsd_cmd) {
  712         case LINUX_IPC_INFO:
  713         case LINUX_MSG_INFO: {
  714                 struct l_msginfo linux_msginfo;
  715 
  716                 memset(&linux_msginfo, 0, sizeof(linux_msginfo));
  717                 /*
  718                  * XXX MSG_INFO uses the same data structure but returns different
  719                  * dynamic counters in msgpool, msgmap, and msgtql fields.
  720                  */
  721                 linux_msginfo.msgpool = (long)msginfo.msgmni *
  722                     (long)msginfo.msgmnb / 1024L;       /* XXX MSG_INFO. */
  723                 linux_msginfo.msgmap = msginfo.msgmnb;  /* XXX MSG_INFO. */
  724                 linux_msginfo.msgmax = msginfo.msgmax;
  725                 linux_msginfo.msgmnb = msginfo.msgmnb;
  726                 linux_msginfo.msgmni = msginfo.msgmni;
  727                 linux_msginfo.msgssz = msginfo.msgssz;
  728                 linux_msginfo.msgtql = msginfo.msgtql;  /* XXX MSG_INFO. */
  729                 linux_msginfo.msgseg = msginfo.msgseg;
  730                 error = copyout(&linux_msginfo, PTRIN(args->buf),
  731                     sizeof(linux_msginfo));
  732                 if (error == 0)
  733                     td->td_retval[0] = msginfo.msgmni;  /* XXX */
  734 
  735                 return (error);
  736         }
  737 
  738         /* 
  739          * TODO: implement this 
  740          * case LINUX_MSG_STAT:
  741          */
  742         case LINUX_IPC_STAT:
  743                 /* NOTHING */
  744                 break;
  745 
  746         case LINUX_IPC_SET:
  747                 error = linux_msqid_pullup(args->cmd & LINUX_IPC_64,
  748                     &linux_msqid64, PTRIN(args->buf));
  749                 if (error != 0)
  750                         return (error);
  751                 linux_to_bsd_msqid_ds(&linux_msqid64, &bsd_msqid);
  752                 break;
  753 
  754         case LINUX_IPC_RMID:
  755                 /* NOTHING */
  756                 break;
  757 
  758         default:
  759                 return (EINVAL);
  760                 break;
  761         }
  762 
  763         error = kern_msgctl(td, args->msqid, bsd_cmd, &bsd_msqid);
  764         if (error != 0) {
  765                 if (bsd_cmd == LINUX_IPC_RMID && error == EACCES)
  766                         return (EPERM);
  767                 if (bsd_cmd != LINUX_IPC_RMID || error != EINVAL)
  768                         return (error);
  769         }
  770 
  771         if (bsd_cmd == LINUX_IPC_STAT) {
  772                 bsd_to_linux_msqid_ds(&bsd_msqid, &linux_msqid64);
  773                 return (linux_msqid_pushdown(args->cmd & LINUX_IPC_64,
  774                     &linux_msqid64, PTRIN(args->buf)));
  775         }
  776 
  777         return (0);
  778 }
  779 
  780 int
  781 linux_shmat(struct thread *td, struct linux_shmat_args *args)
  782 {
  783         struct shmat_args /* {
  784                 int shmid;
  785                 void *shmaddr;
  786                 int shmflg;
  787         } */ bsd_args;
  788         int error;
  789 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
  790         l_uintptr_t addr;
  791 #endif
  792 
  793         bsd_args.shmid = args->shmid;
  794         bsd_args.shmaddr = PTRIN(args->shmaddr);
  795         bsd_args.shmflg = args->shmflg;
  796         if ((error = sys_shmat(td, &bsd_args)))
  797                 return (error);
  798 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
  799         addr = td->td_retval[0];
  800         if ((error = copyout(&addr, PTRIN(args->raddr), sizeof(addr))))
  801                 return (error);
  802         td->td_retval[0] = 0;
  803 #endif
  804         return (0);
  805 }
  806 
  807 int
  808 linux_shmdt(struct thread *td, struct linux_shmdt_args *args)
  809 {
  810         struct shmdt_args /* {
  811                 void *shmaddr;
  812         } */ bsd_args;
  813 
  814         bsd_args.shmaddr = PTRIN(args->shmaddr);
  815         return (sys_shmdt(td, &bsd_args));
  816 }
  817 
  818 int
  819 linux_shmget(struct thread *td, struct linux_shmget_args *args)
  820 {
  821         struct shmget_args /* {
  822                 key_t key;
  823                 int size;
  824                 int shmflg;
  825         } */ bsd_args;
  826 
  827         bsd_args.key = args->key;
  828         bsd_args.size = args->size;
  829         bsd_args.shmflg = args->shmflg;
  830         return (sys_shmget(td, &bsd_args));
  831 }
  832 
  833 int
  834 linux_shmctl(struct thread *td, struct linux_shmctl_args *args)
  835 {
  836         struct l_shmid64_ds linux_shmid64;
  837         struct l_shminfo64 linux_shminfo64;
  838         struct l_shm_info linux_shm_info;
  839         struct shmid_ds bsd_shmid;
  840         int error;
  841 
  842         memset(&linux_shm_info, 0, sizeof(linux_shm_info));
  843         memset(&linux_shmid64, 0, sizeof(linux_shmid64));
  844         memset(&linux_shminfo64, 0, sizeof(linux_shminfo64));
  845 
  846         switch (args->cmd & ~LINUX_IPC_64) {
  847 
  848         case LINUX_IPC_INFO: {
  849                 struct shminfo bsd_shminfo;
  850 
  851                 /* Perform shmctl wanting removed segments lookup */
  852                 error = kern_shmctl(td, args->shmid, IPC_INFO,
  853                     (void *)&bsd_shminfo, NULL);
  854                 if (error != 0)
  855                         return (error);
  856 
  857                 bsd_to_linux_shminfo(&bsd_shminfo, &linux_shminfo64);
  858 
  859                 return (linux_shminfo_pushdown(args->cmd & LINUX_IPC_64,
  860                     &linux_shminfo64, PTRIN(args->buf)));
  861         }
  862 
  863         case LINUX_SHM_INFO: {
  864                 struct shm_info bsd_shm_info;
  865 
  866                 /* Perform shmctl wanting removed segments lookup */
  867                 error = kern_shmctl(td, args->shmid, SHM_INFO,
  868                     (void *)&bsd_shm_info, NULL);
  869                 if (error != 0)
  870                         return (error);
  871 
  872                 bsd_to_linux_shm_info(&bsd_shm_info, &linux_shm_info);
  873 
  874                 return (copyout(&linux_shm_info, PTRIN(args->buf),
  875                     sizeof(struct l_shm_info)));
  876         }
  877 
  878         case LINUX_IPC_STAT:
  879                 /* Perform shmctl wanting removed segments lookup */
  880                 error = kern_shmctl(td, args->shmid, IPC_STAT,
  881                     (void *)&bsd_shmid, NULL);
  882                 if (error != 0)
  883                         return (error);
  884 
  885                 bsd_to_linux_shmid_ds(&bsd_shmid, &linux_shmid64);
  886 
  887                 return (linux_shmid_pushdown(args->cmd & LINUX_IPC_64,
  888                     &linux_shmid64, PTRIN(args->buf)));
  889 
  890         case LINUX_SHM_STAT:
  891                 /* Perform shmctl wanting removed segments lookup */
  892                 error = kern_shmctl(td, args->shmid, IPC_STAT,
  893                     (void *)&bsd_shmid, NULL);
  894                 if (error != 0)
  895                         return (error);
  896 
  897                 bsd_to_linux_shmid_ds(&bsd_shmid, &linux_shmid64);
  898 
  899                 return (linux_shmid_pushdown(args->cmd & LINUX_IPC_64,
  900                     &linux_shmid64, PTRIN(args->buf)));
  901 
  902         case LINUX_IPC_SET:
  903                 error = linux_shmid_pullup(args->cmd & LINUX_IPC_64,
  904                     &linux_shmid64, PTRIN(args->buf));
  905                 if (error != 0)
  906                         return (error);
  907 
  908                 linux_to_bsd_shmid_ds(&linux_shmid64, &bsd_shmid);
  909 
  910                 /* Perform shmctl wanting removed segments lookup */
  911                 return (kern_shmctl(td, args->shmid, IPC_SET,
  912                     (void *)&bsd_shmid, NULL));
  913 
  914         case LINUX_IPC_RMID: {
  915                 void *buf;
  916 
  917                 if (args->buf == 0)
  918                         buf = NULL;
  919                 else {
  920                         error = linux_shmid_pullup(args->cmd & LINUX_IPC_64,
  921                             &linux_shmid64, PTRIN(args->buf));
  922                         if (error != 0)
  923                                 return (error);
  924                         linux_to_bsd_shmid_ds(&linux_shmid64, &bsd_shmid);
  925                         buf = (void *)&bsd_shmid;
  926                 }
  927                 return (kern_shmctl(td, args->shmid, IPC_RMID, buf, NULL));
  928         }
  929 
  930         case LINUX_SHM_LOCK:
  931                 /* FALLTHROUGH */
  932         case LINUX_SHM_UNLOCK:
  933                 /* FALLTHROUGH */
  934         default:
  935                 linux_msg(td, "ipc type %d not implemented",
  936                     args->cmd & ~LINUX_IPC_64);
  937                 return (EINVAL);
  938         }
  939 }
  940 
  941 MODULE_DEPEND(linux, sysvmsg, 1, 1, 1);
  942 MODULE_DEPEND(linux, sysvsem, 1, 1, 1);
  943 MODULE_DEPEND(linux, sysvshm, 1, 1, 1);

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