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 *const tcp, const unsigned int code,
  59              const kernel_ureg_t arg)
  60 {
  61         switch (code) {
  62         case UFFDIO_API: {
  63                 struct uffdio_api ua;
  64                 if (entering(tcp)) {
  65                         tprints(", ");
  66                         if (umove_or_printaddr(tcp, arg, &ua))
  67                                 return RVAL_DECODED | 1;
  68                         /* Features is intended to contain some flags, but
  69                          * there aren't any defined yet.
  70                          */
  71                         tprintf("{api=%#" PRI__x64
  72                                 ", features=%#" PRI__x64,
  73                                 ua.api, ua.features);
  74                 } else {
  75                         if (!syserror(tcp) && !umove(tcp, arg, &ua)) {
  76                                 tprintf(", features.out=%#" PRI__x64
  77                                         ", ioctls=", ua.features);
  78                                 printflags64(uffd_api_flags, ua.ioctls,
  79                                              "_UFFDIO_???");
  80                         }
  81                         tprints("}");
  82                 }
  83                 return 1;
  84         }
  85
  86         case UFFDIO_COPY: {
  87                 struct uffdio_copy uc;
  88                 if (entering(tcp)) {
  89                         tprints(", ");
  90                         if (umove_or_printaddr(tcp, arg, &uc))
  91                                 return RVAL_DECODED | 1;
  92                         tprintf("{dst=%#" PRI__x64 ", src=%#" PRI__x64
  93                                 ", len=%#" PRI__x64 ", mode=",
  94                                 uc.dst, uc.src, uc.len);
  95                         printflags64(uffd_copy_flags, uc.mode,
  96                                      "UFFDIO_COPY_???");
  97                 } else {
  98                         if (!syserror(tcp) && !umove(tcp, arg, &uc))
  99                                 tprintf(", copy=%#" PRI__x64, uc.copy);
 100                         tprints("}");
 101                 }
 102                 return 1;
 103         }
 104
 105         case UFFDIO_REGISTER: {
 106                 struct uffdio_register ur;
 107                 if (entering(tcp)) {
 108                         tprints(", ");
 109                         if (umove_or_printaddr(tcp, arg, &ur))
 110                                 return RVAL_DECODED | 1;
 111                         tprints("{range=");
 112                         tprintf_uffdio_range(&ur.range);
 113                         tprints(", mode=");
 114                         printflags64(uffd_register_mode_flags, ur.mode,
 115                                      "UFFDIO_REGISTER_MODE_???");
 116                 } else {
 117                         if (!syserror(tcp) && !umove(tcp, arg, &ur)) {
 118                                 tprints(", ioctls=");
 119                                 printflags64(uffd_register_ioctl_flags,
 120                                              ur.ioctls, "UFFDIO_???");
 121                         }
 122                         tprints("}");
 123                 }
 124                 return 1;
 125         }
 126
 127         case UFFDIO_UNREGISTER:
 128         case UFFDIO_WAKE: {
 129                 struct uffdio_range ura;
 130                 tprints(", ");
 131                 if (!umove_or_printaddr(tcp, arg, &ura))
 132                         tprintf_uffdio_range(&ura);
 133                 return RVAL_DECODED | 1;
 134         }
 135
 136         case UFFDIO_ZEROPAGE: {
 137                 struct uffdio_zeropage uz;
 138                 if (entering(tcp)) {
 139                         tprints(", ");
 140                         if (umove_or_printaddr(tcp, arg, &uz))
 141                                 return RVAL_DECODED | 1;
 142                         tprints("{range=");
 143                         tprintf_uffdio_range(&uz.range);
 144                         tprints(", mode=");
 145                         printflags64(uffd_zeropage_flags, uz.mode,
 146                                      "UFFDIO_ZEROPAGE_???");
 147                 } else {
 148                         if (!syserror(tcp) && !umove(tcp, arg, &uz))
 149                                 tprintf(", zeropage=%#" PRI__x64, uz.zeropage);
 150                         tprints("}");
 151                 }
 152                 return 1;
 153         }
 154
 155         default:
 156                 return RVAL_DECODED;
 157         }
 158 }
 159 #endif /* HAVE_LINUX_USERFAULTFD_H */