1 /* 2 * Copyright (c) 2015 Dmitry V. Levin <ldv (at) 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 "print_fields.h" 31 #include <fcntl.h> 32 33 #include "xlat/uffd_flags.h" 34 35 SYS_FUNC(userfaultfd) 36 { 37 printflags(uffd_flags, tcp->u_arg[0], "UFFD_???"); 38 39 return RVAL_DECODED | RVAL_FD; 40 } 41 42 #ifdef HAVE_LINUX_USERFAULTFD_H 43 # include <linux/ioctl.h> 44 # include <linux/userfaultfd.h> 45 46 # include "xlat/uffd_api_features.h" 47 # include "xlat/uffd_api_flags.h" 48 # include "xlat/uffd_copy_flags.h" 49 # include "xlat/uffd_register_ioctl_flags.h" 50 # include "xlat/uffd_register_mode_flags.h" 51 # include "xlat/uffd_zeropage_flags.h" 52 53 static void 54 tprintf_uffdio_range(const struct uffdio_range *range) 55 { 56 PRINT_FIELD_X("{", *range, start); 57 PRINT_FIELD_X(", ", *range, len); 58 tprints("}"); 59 } 60 61 #define PRINT_FIELD_UFFDIO_RANGE(prefix_, where_, field_) \ 62 do { \ 63 STRACE_PRINTF("%s%s=", (prefix_), #field_); \ 64 tprintf_uffdio_range(&(where_).field_); \ 65 } while (0) 66 67 int 68 uffdio_ioctl(struct tcb *const tcp, const unsigned int code, 69 const kernel_ulong_t arg) 70 { 71 switch (code) { 72 case UFFDIO_API: { 73 uint64_t *entering_features; 74 struct uffdio_api ua; 75 76 if (entering(tcp)) { 77 tprints(", "); 78 if (umove_or_printaddr(tcp, arg, &ua)) 79 break; 80 PRINT_FIELD_X("{", ua, api); 81 PRINT_FIELD_FLAGS(", ", ua, features, uffd_api_features, 82 "UFFD_FEATURE_???"); 83 entering_features = malloc(sizeof(*entering_features)); 84 if (entering_features) { 85 *entering_features = ua.features; 86 set_tcb_priv_data(tcp, entering_features, free); 87 } 88 89 return 0; 90 } 91 92 if (!syserror(tcp) && !umove(tcp, arg, &ua)) { 93 entering_features = get_tcb_priv_data(tcp); 94 95 if (!entering_features 96 || *entering_features != ua.features) { 97 PRINT_FIELD_FLAGS(" => ", ua, features, 98 uffd_api_features, 99 "UFFD_FEATURE_???"); 100 } 101 102 PRINT_FIELD_FLAGS(", ", ua, ioctls, uffd_api_flags, 103 "_UFFDIO_???"); 104 } 105 106 tprints("}"); 107 108 break; 109 } 110 111 case UFFDIO_COPY: { 112 struct uffdio_copy uc; 113 114 if (entering(tcp)) { 115 tprints(", "); 116 if (umove_or_printaddr(tcp, arg, &uc)) 117 return RVAL_IOCTL_DECODED; 118 PRINT_FIELD_X("{", uc, dst); 119 PRINT_FIELD_X(", ", uc, src); 120 PRINT_FIELD_X(", ", uc, len); 121 PRINT_FIELD_FLAGS(", ", uc, mode, uffd_copy_flags, 122 "UFFDIO_COPY_???"); 123 124 return 0; 125 } 126 127 if (!syserror(tcp) && !umove(tcp, arg, &uc)) 128 PRINT_FIELD_X(", ", uc, copy); 129 130 tprints("}"); 131 132 break; 133 } 134 135 case UFFDIO_REGISTER: { 136 struct uffdio_register ur; 137 138 if (entering(tcp)) { 139 tprints(", "); 140 if (umove_or_printaddr(tcp, arg, &ur)) 141 return RVAL_IOCTL_DECODED; 142 PRINT_FIELD_UFFDIO_RANGE("{", ur, range); 143 PRINT_FIELD_FLAGS(", ", ur, mode, 144 uffd_register_mode_flags, 145 "UFFDIO_REGISTER_MODE_???"); 146 147 return 0; 148 } 149 150 if (!syserror(tcp) && !umove(tcp, arg, &ur)) { 151 PRINT_FIELD_FLAGS(", ", ur, ioctls, 152 uffd_register_ioctl_flags, 153 "UFFDIO_???"); 154 } 155 156 tprints("}"); 157 158 break; 159 } 160 161 case UFFDIO_UNREGISTER: 162 case UFFDIO_WAKE: { 163 struct uffdio_range ura; 164 165 tprints(", "); 166 167 if (!umove_or_printaddr(tcp, arg, &ura)) 168 tprintf_uffdio_range(&ura); 169 170 break; 171 } 172 173 case UFFDIO_ZEROPAGE: { 174 struct uffdio_zeropage uz; 175 176 if (entering(tcp)) { 177 tprints(", "); 178 if (umove_or_printaddr(tcp, arg, &uz)) 179 return RVAL_IOCTL_DECODED; 180 PRINT_FIELD_UFFDIO_RANGE("{", uz, range); 181 PRINT_FIELD_FLAGS(", ", uz, mode, uffd_zeropage_flags, 182 "UFFDIO_ZEROPAGE_???"); 183 184 return 0; 185 } 186 187 if (!syserror(tcp) && !umove(tcp, arg, &uz)) 188 PRINT_FIELD_X(", ", uz, zeropage); 189 190 tprints("}"); 191 192 break; 193 } 194 195 default: 196 return RVAL_DECODED; 197 } 198 199 return RVAL_IOCTL_DECODED; 200 } 201 #endif /* HAVE_LINUX_USERFAULTFD_H */ 202
