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

   1 /*
   2  * Copyright (c) 2015 Dmitry V. Levin <ldv@altlinux.org>
   3  * Copyright (c) 2015-2017 The strace developers.
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  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 "defs.h"
  30 #include <fcntl.h>
  31
  32 #include "xlat/uffd_flags.h"
  33
  34 SYS_FUNC(userfaultfd)
  35 {
  36         printflags(uffd_flags, tcp->u_arg[0], "UFFD_???");
  37
  38         return RVAL_DECODED | RVAL_FD;
  39 }
  40
  41 #ifdef HAVE_LINUX_USERFAULTFD_H
  42 # include <linux/ioctl.h>
  43 # include <linux/userfaultfd.h>
  44
  45 # include "xlat/uffd_api_flags.h"
  46 # include "xlat/uffd_copy_flags.h"
  47 # include "xlat/uffd_register_ioctl_flags.h"
  48 # include "xlat/uffd_register_mode_flags.h"
  49 # include "xlat/uffd_zeropage_flags.h"
  50
  51 static void
  52 tprintf_uffdio_range(const struct uffdio_range *range)
  53 {
  54         tprintf("{start=%#" PRI__x64 ", len=%#" PRI__x64 "}",
  55                 range->start, range->len);
  56 }
  57
  58 int
  59 uffdio_ioctl(struct tcb *const tcp, const unsigned int code,
  60              const kernel_ulong_t arg)
  61 {
  62         switch (code) {
  63         case UFFDIO_API: {
  64                 struct uffdio_api ua;
  65                 if (entering(tcp)) {
  66                         tprints(", ");
  67                         if (umove_or_printaddr(tcp, arg, &ua))
  68                                 return RVAL_DECODED | 1;
  69                         /* Features is intended to contain some flags, but
  70                          * there aren't any defined yet.
  71                          */
  72                         tprintf("{api=%#" PRI__x64
  73                                 ", features=%#" PRI__x64,
  74                                 ua.api, ua.features);
  75                 } else {
  76                         if (!syserror(tcp) && !umove(tcp, arg, &ua)) {
  77                                 tprintf(", features.out=%#" PRI__x64
  78                                         ", ioctls=", ua.features);
  79                                 printflags64(uffd_api_flags, ua.ioctls,
  80                                              "_UFFDIO_???");
  81                         }
  82                         tprints("}");
  83                 }
  84                 return 1;
  85         }
  86
  87         case UFFDIO_COPY: {
  88                 struct uffdio_copy uc;
  89                 if (entering(tcp)) {
  90                         tprints(", ");
  91                         if (umove_or_printaddr(tcp, arg, &uc))
  92                                 return RVAL_DECODED | 1;
  93                         tprintf("{dst=%#" PRI__x64 ", src=%#" PRI__x64
  94                                 ", len=%#" PRI__x64 ", mode=",
  95                                 uc.dst, uc.src, uc.len);
  96                         printflags64(uffd_copy_flags, uc.mode,
  97                                      "UFFDIO_COPY_???");
  98                 } else {
  99                         if (!syserror(tcp) && !umove(tcp, arg, &uc))
 100                                 tprintf(", copy=%#" PRI__x64, uc.copy);
 101                         tprints("}");
 102                 }
 103                 return 1;
 104         }
 105
 106         case UFFDIO_REGISTER: {
 107                 struct uffdio_register ur;
 108                 if (entering(tcp)) {
 109                         tprints(", ");
 110                         if (umove_or_printaddr(tcp, arg, &ur))
 111                                 return RVAL_DECODED | 1;
 112                         tprints("{range=");
 113                         tprintf_uffdio_range(&ur.range);
 114                         tprints(", mode=");
 115                         printflags64(uffd_register_mode_flags, ur.mode,
 116                                      "UFFDIO_REGISTER_MODE_???");
 117                 } else {
 118                         if (!syserror(tcp) && !umove(tcp, arg, &ur)) {
 119                                 tprints(", ioctls=");
 120                                 printflags64(uffd_register_ioctl_flags,
 121                                              ur.ioctls, "UFFDIO_???");
 122                         }
 123                         tprints("}");
 124                 }
 125                 return 1;
 126         }
 127
 128         case UFFDIO_UNREGISTER:
 129         case UFFDIO_WAKE: {
 130                 struct uffdio_range ura;
 131                 tprints(", ");
 132                 if (!umove_or_printaddr(tcp, arg, &ura))
 133                         tprintf_uffdio_range(&ura);
 134                 return RVAL_DECODED | 1;
 135         }
 136
 137         case UFFDIO_ZEROPAGE: {
 138                 struct uffdio_zeropage uz;
 139                 if (entering(tcp)) {
 140                         tprints(", ");
 141                         if (umove_or_printaddr(tcp, arg, &uz))
 142                                 return RVAL_DECODED | 1;
 143                         tprints("{range=");
 144                         tprintf_uffdio_range(&uz.range);
 145                         tprints(", mode=");
 146                         printflags64(uffd_zeropage_flags, uz.mode,
 147                                      "UFFDIO_ZEROPAGE_???");
 148                 } else {
 149                         if (!syserror(tcp) && !umove(tcp, arg, &uz))
 150                                 tprintf(", zeropage=%#" PRI__x64, uz.zeropage);
 151                         tprints("}");
 152                 }
 153                 return 1;
 154         }
 155
 156         default:
 157                 return RVAL_DECODED;
 158         }
 159 }
 160 #endif /* HAVE_LINUX_USERFAULTFD_H */