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

   1 /*
   2  * Copyright (c) 2015 Dmitry V. Levin <ldv@altlinux.org>
   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  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. The name of the author may not be used to endorse or promote products
  14  *    derived from this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27
  28 #include "defs.h"
  29 #include <fcntl.h>
  30
  31 #include "xlat/uffd_flags.h"
  32
  33 SYS_FUNC(userfaultfd)
  34 {
  35         printflags(uffd_flags, tcp->u_arg[0], "UFFD_???");
  36
  37         return RVAL_DECODED | RVAL_FD;
  38 }
  39
  40 #ifdef HAVE_LINUX_USERFAULTFD_H
  41 # include <linux/ioctl.h>
  42 # include <linux/userfaultfd.h>
  43
  44 # include "xlat/uffd_api_flags.h"
  45 # include "xlat/uffd_copy_flags.h"
  46 # include "xlat/uffd_register_ioctl_flags.h"
  47 # include "xlat/uffd_register_mode_flags.h"
  48 # include "xlat/uffd_zeropage_flags.h"
  49
  50 static void
  51 tprintf_uffdio_range(const struct uffdio_range *range)
  52 {
  53         tprintf("{start=%#" PRI__x64 ", len=%#" PRI__x64 "}",
  54                 range->start, range->len);
  55 }
  56
  57 int
  58 uffdio_ioctl(struct tcb *tcp, const unsigned int code, const long arg)
  59 {
  60         switch (code) {
  61         case UFFDIO_API: {
  62                 struct uffdio_api ua;
  63                 if (entering(tcp)) {
  64                         tprints(", ");
  65                         if (umove_or_printaddr(tcp, arg, &ua))
  66                                 return RVAL_DECODED | 1;
  67                         /* Features is intended to contain some flags, but
  68                          * there aren't any defined yet.
  69                          */
  70                         tprintf("{api=%#" PRI__x64
  71                                 ", features=%#" PRI__x64,
  72                                 ua.api, ua.features);
  73                 } else {
  74                         if (!syserror(tcp) && !umove(tcp, arg, &ua)) {
  75                                 tprintf(", features.out=%#" PRI__x64
  76                                         ", ioctls=", ua.features);
  77                                 printflags64(uffd_api_flags, ua.ioctls,
  78                                              "_UFFDIO_???");
  79                         }
  80                         tprintf("}");
  81                 }
  82                 return 1;
  83         }
  84
  85         case UFFDIO_COPY: {
  86                 struct uffdio_copy uc;
  87                 if (entering(tcp)) {
  88                         tprints(", ");
  89                         if (umove_or_printaddr(tcp, arg, &uc))
  90                                 return RVAL_DECODED | 1;
  91                         tprintf("{dst=%#" PRI__x64 ", src=%#" PRI__x64
  92                                 ", len=%#" PRI__x64 ", mode=",
  93                                 uc.dst, uc.src, uc.len);
  94                         printflags64(uffd_copy_flags, uc.mode,
  95                                      "UFFDIO_COPY_???");
  96                 } else {
  97                         if (!syserror(tcp) && !umove(tcp, arg, &uc))
  98                                 tprintf(", copy=%#" PRI__x64, uc.copy);
  99                         tprints("}");
 100                 }
 101                 return 1;
 102         }
 103
 104         case UFFDIO_REGISTER: {
 105                 struct uffdio_register ur;
 106                 if (entering(tcp)) {
 107                         tprints(", ");
 108                         if (umove_or_printaddr(tcp, arg, &ur))
 109                                 return RVAL_DECODED | 1;
 110                         tprintf("{range=");
 111                         tprintf_uffdio_range(&ur.range);
 112                         tprintf(", mode=");
 113                         printflags64(uffd_register_mode_flags, ur.mode,
 114                                      "UFFDIO_REGISTER_MODE_???");
 115                 } else {
 116                         if (!syserror(tcp) && !umove(tcp, arg, &ur)) {
 117                                 tprintf(", ioctls=");
 118                                 printflags64(uffd_register_ioctl_flags,
 119                                              ur.ioctls, "UFFDIO_???");
 120                         }
 121                         tprints("}");
 122                 }
 123                 return 1;
 124         }
 125
 126         case UFFDIO_UNREGISTER:
 127         case UFFDIO_WAKE: {
 128                 struct uffdio_range ura;
 129                 tprints(", ");
 130                 if (!umove_or_printaddr(tcp, arg, &ura))
 131                         tprintf_uffdio_range(&ura);
 132                 return RVAL_DECODED | 1;
 133         }
 134
 135         case UFFDIO_ZEROPAGE: {
 136                 struct uffdio_zeropage uz;
 137                 if (entering(tcp)) {
 138                         tprints(", ");
 139                         if (umove_or_printaddr(tcp, arg, &uz))
 140                                 return RVAL_DECODED | 1;
 141                         tprintf("{range=");
 142                         tprintf_uffdio_range(&uz.range);
 143                         tprintf(", mode=");
 144                         printflags64(uffd_zeropage_flags, uz.mode,
 145                                      "UFFDIO_ZEROPAGE_???");
 146                 } else {
 147                         if (!syserror(tcp) && !umove(tcp, arg, &uz))
 148                                 tprintf(", zeropage=%#" PRI__x64, uz.zeropage);
 149                         tprints("}");
 150                 }
 151                 return 1;
 152         }
 153
 154         default:
 155                 return RVAL_DECODED;
 156         }
 157 }
 158 #endif /* HAVE_LINUX_USERFAULTFD_H */