granicus.if.org Git - strace/blob - ipc_shmctl.c

   1 /*
   2  * Copyright (c) 1993 Ulrich Pegelow <pegelow@moorea.uni-muenster.de>
   3  * Copyright (c) 1993 Branko Lankester <branko@hacktic.nl>
   4  * Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <jrs@world.std.com>
   5  * Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl>
   6  * Copyright (c) 2003-2006 Roland McGrath <roland@redhat.com>
   7  * Copyright (c) 2006-2015 Dmitry V. Levin <ldv@altlinux.org>
   8  * Copyright (c) 2015-2017 The strace developers.
   9  * All rights reserved.
  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  * 3. The name of the author may not be used to endorse or promote products
  20  *    derived from this software without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  23  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  24  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  25  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  27  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  28  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  29  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  30  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  31  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 #include "defs.h"
  35
  36 #include DEF_MPERS_TYPE(shmid_ds_t)
  37
  38 #include "ipc_defs.h"
  39
  40 #ifdef HAVE_SYS_SHM_H
  41 /* The C library generally exports the struct the current kernel expects. */
  42 # include <sys/shm.h>
  43 typedef struct shmid_ds shmid_ds_t;
  44 #elif defined HAVE_LINUX_SHM_H
  45 /* The linux header might provide the right struct. */
  46 # include <linux/shm.h>
  47 typedef struct shmid64_ds shmid_ds_t;
  48 #endif
  49
  50 #include MPERS_DEFS
  51
  52 #include "xlat/shmctl_flags.h"
  53
  54 static void
  55 print_shmid_ds(struct tcb *const tcp, const kernel_ulong_t addr, int cmd)
  56 {
  57         /* TODO: We don't properly decode old compat ipc calls. */
  58         if (cmd & IPC_64)
  59                 cmd &= ~IPC_64;
  60         shmid_ds_t shmid_ds;
  61         switch (cmd) {
  62         case IPC_SET:
  63         case IPC_STAT:
  64                 if (umove_or_printaddr(tcp, addr, &shmid_ds))
  65                         return;
  66
  67                 tprints("{shm_perm={");
  68                 printuid("uid=", shmid_ds.shm_perm.uid);
  69                 printuid(", gid=", shmid_ds.shm_perm.gid);
  70                 tprints(", mode=");
  71                 print_numeric_umode_t(shmid_ds.shm_perm.mode);
  72
  73                 if (cmd != IPC_STAT) {
  74                         tprints("}, ...}");
  75                         break;
  76                 }
  77
  78                 tprintf(", key=%u", (unsigned) shmid_ds.shm_perm.__key);
  79                 printuid(", cuid=", shmid_ds.shm_perm.cuid);
  80                 printuid(", cgid=", shmid_ds.shm_perm.cgid);
  81                 tprints("}");
  82                 tprintf(", shm_segsz=%u", (unsigned) shmid_ds.shm_segsz);
  83                 tprintf(", shm_cpid=%u", (unsigned) shmid_ds.shm_cpid);
  84                 tprintf(", shm_lpid=%u", (unsigned) shmid_ds.shm_lpid);
  85                 tprintf(", shm_nattch=%u", (unsigned) shmid_ds.shm_nattch);
  86                 tprintf(", shm_atime=%u", (unsigned) shmid_ds.shm_atime);
  87                 tprintf(", shm_dtime=%u", (unsigned) shmid_ds.shm_dtime);
  88                 tprintf(", shm_ctime=%u", (unsigned) shmid_ds.shm_ctime);
  89                 tprints("}");
  90                 break;
  91
  92         default:
  93                 printaddr(addr);
  94                 break;
  95         }
  96 }
  97
  98 SYS_FUNC(shmctl)
  99 {
 100         if (entering(tcp)) {
 101                 tprintf("%d, ", (int) tcp->u_arg[0]);
 102                 PRINTCTL(shmctl_flags, tcp->u_arg[1], "SHM_???");
 103                 tprints(", ");
 104         } else {
 105                 const kernel_ulong_t addr = tcp->u_arg[indirect_ipccall(tcp) ? 3 : 2];
 106                 print_shmid_ds(tcp, addr, tcp->u_arg[1]);
 107         }
 108         return 0;
 109 }