1 /* 2 * Check decoding of name_to_handle_at and open_by_handle_at syscalls. 3 * 4 * Copyright (c) 2015-2016 Dmitry V. Levin <ldv (at) altlinux.org> 5 * Copyright (c) 2016 Eugene Syromyatnikov <evgsyr (at) gmail.com> 6 * Copyright (c) 2015-2018 The strace developers. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. The name of the author may not be used to endorse or promote products 18 * derived from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include "tests.h" 33 #include <asm/unistd.h> 34 35 #if defined __NR_name_to_handle_at && defined __NR_open_by_handle_at 36 37 # include <assert.h> 38 # include <errno.h> 39 # include <inttypes.h> 40 # include <fcntl.h> 41 # include <stdio.h> 42 # include <unistd.h> 43 44 enum assert_rc { 45 ASSERT_NONE, 46 ASSERT_SUCCESS, 47 ASSERT_ERROR, 48 }; 49 50 # ifndef MAX_HANDLE_SZ 51 52 # define MAX_HANDLE_SZ 128 53 54 struct file_handle { 55 unsigned int handle_bytes; 56 int handle_type; 57 unsigned char f_handle[0]; 58 }; 59 # endif /* !MAX_HANDLE_SZ */ 60 61 62 void 63 print_handle_data(unsigned char *bytes, unsigned int size) 64 { 65 unsigned int i; 66 67 if (size > MAX_HANDLE_SZ) 68 size = MAX_HANDLE_SZ; 69 70 printf("0x"); 71 for (i = 0; i < size; ++i) 72 printf("%02x", bytes[i]); 73 } 74 75 void 76 do_name_to_handle_at(kernel_ulong_t dirfd, const char *dirfd_str, 77 kernel_ulong_t pathname, const char *pathname_str, 78 kernel_ulong_t handle, const char *handle_str, 79 kernel_ulong_t mount_id, 80 kernel_ulong_t flags, const char *flags_str, 81 enum assert_rc assert_rc, long assert_errno) 82 { 83 long rc; 84 const char *errstr; 85 86 rc = syscall(__NR_name_to_handle_at, dirfd, pathname, handle, mount_id, 87 flags); 88 errstr = sprintrc(rc); 89 90 if (assert_rc != ASSERT_NONE) 91 assert(rc == (assert_rc == ASSERT_SUCCESS ? 0 : -1)); 92 if (assert_errno) 93 assert(errno != assert_errno); 94 95 printf("name_to_handle_at(%s, %s, %s", 96 dirfd_str, pathname_str, handle_str); 97 98 if (rc != -1) { 99 struct file_handle *fh = 100 (struct file_handle *) (uintptr_t) handle; 101 int *mount_id_ptr = (int *) (uintptr_t) mount_id; 102 103 printf(" => %u, handle_type=%d, f_handle=", 104 fh->handle_bytes, fh->handle_type); 105 print_handle_data((unsigned char *) fh + 106 sizeof(struct file_handle), 107 fh->handle_bytes); 108 printf("}, [%d]", *mount_id_ptr); 109 } else { 110 if (mount_id) 111 printf(", %#llx", (unsigned long long) mount_id); 112 else 113 printf(", NULL"); 114 } 115 116 printf(", %s) = %s\n", flags_str, errstr); 117 } 118 119 void 120 do_open_by_handle_at(kernel_ulong_t mount_fd, 121 kernel_ulong_t handle, bool valid_handle, bool valid_data, 122 kernel_ulong_t flags, const char *flags_str) 123 { 124 long rc; 125 126 printf("open_by_handle_at(%d, ", (int) mount_fd); 127 if (valid_handle) { 128 struct file_handle *fh = 129 (struct file_handle *) (uintptr_t) handle; 130 131 printf("{handle_bytes=%u, handle_type=%d", fh->handle_bytes, 132 fh->handle_type); 133 134 if (valid_data) { 135 printf(", f_handle="); 136 print_handle_data((unsigned char *) fh + 137 sizeof(struct file_handle), 138 fh->handle_bytes); 139 } 140 141 printf("}"); 142 } else { 143 if (handle) 144 printf("%#llx", (unsigned long long) handle); 145 else 146 printf("NULL"); 147 } 148 printf(", %s) = ", flags_str); 149 150 rc = syscall(__NR_open_by_handle_at, mount_fd, handle, flags); 151 152 printf("%s\n", sprintrc(rc)); 153 } 154 155 struct strval { 156 kernel_ulong_t val; 157 const char *str; 158 }; 159 160 #define STR16 "0123456789abcdef" 161 #define STR64 STR16 STR16 STR16 STR16 162 163 int 164 main(void) 165 { 166 enum { 167 PATH1_SIZE = 64, 168 }; 169 170 static const kernel_ulong_t fdcwd = 171 (kernel_ulong_t) 0x87654321ffffff9cULL; 172 static const struct strval dirfds[] = { 173 { (kernel_ulong_t) 0xdeadca57badda7a1ULL, "-1159878751" }, 174 { (kernel_ulong_t) 0x12345678ffffff9cULL, "AT_FDCWD" }, 175 }; 176 static const struct strval name_flags[] = { 177 { (kernel_ulong_t) 0xdeadf15700000000ULL, "0" }, 178 { (kernel_ulong_t) 0xbadc0ded00001000ULL, 179 "AT_EMPTY_PATH" }, 180 { (kernel_ulong_t) 0xdeadc0deda7a1457ULL, 181 "AT_SYMLINK_FOLLOW|AT_EMPTY_PATH|0xda7a0057" }, 182 { (kernel_ulong_t) 0xdefaced1ffffebffULL, 183 "0xffffebff /* AT_??? */" }, 184 }; 185 static const kernel_ulong_t mount_fds[] = { 186 (kernel_ulong_t) 0xdeadca5701234567ULL, 187 (kernel_ulong_t) 0x12345678ffffff9cULL, 188 }; 189 static const struct strval open_flags[] = { 190 { F8ILL_KULONG_MASK, "O_RDONLY" }, 191 { (kernel_ulong_t) 0xdeadbeef80000001ULL, 192 "O_WRONLY|0x80000000" } 193 }; 194 195 static const char str64[] = STR64; 196 197 198 char *bogus_path1 = tail_memdup(str64, PATH1_SIZE); 199 char *bogus_path2 = tail_memdup(str64, sizeof(str64)); 200 201 struct file_handle *handle = 202 tail_alloc(sizeof(struct file_handle) + MAX_HANDLE_SZ); 203 struct file_handle *handle_0 = 204 tail_alloc(sizeof(struct file_handle) + 0); 205 struct file_handle *handle_8 = 206 tail_alloc(sizeof(struct file_handle) + 8); 207 struct file_handle *handle_128 = 208 tail_alloc(sizeof(struct file_handle) + 128); 209 struct file_handle *handle_256 = 210 tail_alloc(sizeof(struct file_handle) + 256); 211 TAIL_ALLOC_OBJECT_CONST_PTR(int, bogus_mount_id); 212 213 char handle_0_addr[sizeof("0x") + sizeof(void *) * 2]; 214 215 char bogus_path1_addr[sizeof("0x") + sizeof(void *) * 2]; 216 char bogus_path1_after_addr[sizeof("0x") + sizeof(void *) * 2]; 217 218 219 struct strval paths[] = { 220 { (kernel_ulong_t) 0, "NULL" }, 221 { (kernel_ulong_t) (uintptr_t) (bogus_path1 + PATH1_SIZE), 222 bogus_path1_after_addr }, 223 { (kernel_ulong_t) (uintptr_t) bogus_path1, bogus_path1_addr }, 224 { (kernel_ulong_t) (uintptr_t) bogus_path2, "\"" STR64 "\"" }, 225 }; 226 struct strval name_handles[] = { 227 { (uintptr_t) (handle_0 + sizeof(struct file_handle)), 228 handle_0_addr }, 229 { (uintptr_t) handle_0, "{handle_bytes=256}" }, 230 { (uintptr_t) handle_8, "{handle_bytes=0}" }, 231 { (uintptr_t) handle_128, "{handle_bytes=128}" }, 232 { (uintptr_t) handle_256, "{handle_bytes=256}" }, 233 }; 234 struct { 235 kernel_ulong_t addr; 236 bool valid; 237 bool valid_data; 238 } open_handles[] = { 239 { 0, false, false }, 240 { (uintptr_t) (handle_0 + sizeof(struct file_handle)), 241 false, false }, 242 { (uintptr_t) handle_0 + 4, false, false }, 243 { (uintptr_t) handle_0, true, false }, 244 { (uintptr_t) handle_8, true, true }, 245 { (uintptr_t) handle_128, true, true }, 246 { (uintptr_t) handle_256, true, true }, 247 }; 248 kernel_ulong_t mount_ids[] = { 249 0, 250 (kernel_ulong_t) (uintptr_t) (bogus_mount_id + 1), 251 (kernel_ulong_t) (uintptr_t) bogus_mount_id, 252 }; 253 254 const int flags = 0x400; 255 int mount_id; 256 unsigned int i; 257 unsigned int j; 258 unsigned int k; 259 unsigned int l; 260 unsigned int m; 261 262 263 snprintf(bogus_path1_addr, sizeof(bogus_path1_addr), "%p", bogus_path1); 264 snprintf(bogus_path1_after_addr, sizeof(bogus_path1_after_addr), "%p", 265 bogus_path1 + PATH1_SIZE); 266 267 handle_0->handle_bytes = 256; 268 handle_8->handle_bytes = 0; 269 handle_128->handle_bytes = 128; 270 handle_256->handle_bytes = 256; 271 272 fill_memory((char *) handle_128 + sizeof(struct file_handle), 128); 273 fill_memory((char *) handle_256 + sizeof(struct file_handle), 256); 274 275 snprintf(handle_0_addr, sizeof(handle_0_addr), "%p", 276 handle_0 + sizeof(struct file_handle)); 277 278 handle->handle_bytes = 0; 279 280 assert(syscall(__NR_name_to_handle_at, fdcwd, ".", handle, &mount_id, 281 flags | 1) == -1); 282 if (EINVAL != errno) 283 perror_msg_and_skip("name_to_handle_at"); 284 printf("name_to_handle_at(AT_FDCWD, \".\", {handle_bytes=0}, %p" 285 ", AT_SYMLINK_FOLLOW|0x1) = -1 EINVAL (%m)\n", &mount_id); 286 287 assert(syscall(__NR_name_to_handle_at, fdcwd, ".", handle, &mount_id, 288 flags) == -1); 289 if (EOVERFLOW != errno) 290 perror_msg_and_skip("name_to_handle_at"); 291 printf("name_to_handle_at(AT_FDCWD, \".\", {handle_bytes=0 => %u}" 292 ", %p, AT_SYMLINK_FOLLOW) = -1 EOVERFLOW (%m)\n", 293 handle->handle_bytes, &mount_id); 294 295 assert(syscall(__NR_name_to_handle_at, fdcwd, ".", handle, &mount_id, 296 flags) == 0); 297 printf("name_to_handle_at(AT_FDCWD, \".\", {handle_bytes=%u" 298 ", handle_type=%d, f_handle=0x", 299 handle->handle_bytes, handle->handle_type); 300 for (i = 0; i < handle->handle_bytes; ++i) 301 printf("%02x", handle->f_handle[i]); 302 printf("}, [%d], AT_SYMLINK_FOLLOW) = 0\n", mount_id); 303 304 printf("open_by_handle_at(-1, {handle_bytes=%u, handle_type=%d" 305 ", f_handle=0x", handle->handle_bytes, handle->handle_type); 306 for (i = 0; i < handle->handle_bytes; ++i) 307 printf("%02x", handle->f_handle[i]); 308 int rc = syscall(__NR_open_by_handle_at, -1, handle, 309 O_RDONLY | O_DIRECTORY); 310 printf("}, O_RDONLY|O_DIRECTORY) = %d %s (%m)\n", rc, errno2name()); 311 312 for (i = 0; i < ARRAY_SIZE(dirfds); i++) { 313 for (j = 0; j < ARRAY_SIZE(paths); j++) { 314 for (k = 0; k < ARRAY_SIZE(name_handles); k++) { 315 for (l = 0; l < ARRAY_SIZE(mount_ids); l++) { 316 for (m = 0; m < ARRAY_SIZE(name_flags); 317 m++) { 318 do_name_to_handle_at( 319 dirfds[i].val, 320 dirfds[i].str, 321 paths[j].val, 322 paths[j].str, 323 name_handles[k].val, 324 name_handles[k].str, 325 mount_ids[l], 326 name_flags[m].val, 327 name_flags[m].str, 328 ASSERT_ERROR, 0); 329 } 330 } 331 } 332 } 333 } 334 335 for (i = 0; i < ARRAY_SIZE(mount_fds); i++) { 336 for (j = 0; j < ARRAY_SIZE(open_handles); j++) { 337 for (k = 0; k < ARRAY_SIZE(open_flags); k++) { 338 do_open_by_handle_at(mount_fds[i], 339 open_handles[j].addr, 340 open_handles[j].valid, 341 open_handles[j].valid_data, 342 open_flags[k].val, 343 open_flags[k].str); 344 } 345 } 346 } 347 348 puts("+++ exited with 0 +++"); 349 return 0; 350 } 351 352 #else 353 354 SKIP_MAIN_UNDEFINED("__NR_name_to_handle_at && __NR_open_by_handle_at") 355 356 #endif 357
