1 /*
2 * Copyright (c) 2001, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
358 //
359 static DIR *open_directory_secure_cwd(const char* dirname, int *saved_cwd_fd) {
360
361 // Open the directory.
362 DIR* dirp = open_directory_secure(dirname);
363 if (dirp == NULL) {
364 // Directory doesn't exist or is insecure, so there is nothing to cleanup.
365 return dirp;
366 }
367 int fd = dirfd(dirp);
368
369 // Open a fd to the cwd and save it off.
370 int result;
371 RESTARTABLE(::open(".", O_RDONLY), result);
372 if (result == OS_ERR) {
373 *saved_cwd_fd = -1;
374 } else {
375 *saved_cwd_fd = result;
376 }
377
378 // Set the current directory to dirname by using the fd of the directory.
379 result = fchdir(fd);
380
381 return dirp;
382 }
383
384 // Close the directory and restore the current working directory.
385 //
386 static void close_directory_secure_cwd(DIR* dirp, int saved_cwd_fd) {
387
388 int result;
389 // If we have a saved cwd change back to it and close the fd.
390 if (saved_cwd_fd != -1) {
391 result = fchdir(saved_cwd_fd);
392 ::close(saved_cwd_fd);
393 }
394
395 // Close the directory.
396 os::closedir(dirp);
397 }
398
399 // Check if the given file descriptor is considered a secure.
400 //
401 static bool is_file_secure(int fd, const char *filename) {
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1 /*
2 * Copyright (c) 2001, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
358 //
359 static DIR *open_directory_secure_cwd(const char* dirname, int *saved_cwd_fd) {
360
361 // Open the directory.
362 DIR* dirp = open_directory_secure(dirname);
363 if (dirp == NULL) {
364 // Directory doesn't exist or is insecure, so there is nothing to cleanup.
365 return dirp;
366 }
367 int fd = dirfd(dirp);
368
369 // Open a fd to the cwd and save it off.
370 int result;
371 RESTARTABLE(::open(".", O_RDONLY), result);
372 if (result == OS_ERR) {
373 *saved_cwd_fd = -1;
374 } else {
375 *saved_cwd_fd = result;
376 }
377
378 // Set the current directory to dirname by using the fd of the directory and
379 // handle errors, otherwise shared memory files will be created in cwd.
380 result = fchdir(fd);
381 if (result == OS_ERR) {
382 if (PrintMiscellaneous && Verbose) {
383 warning("could not change to directory %s", dirname);
384 }
385 if (*saved_cwd_fd != -1) {
386 ::close(*saved_cwd_fd);
387 *saved_cwd_fd = -1;
388 }
389 // Close the directory.
390 os::closedir(dirp);
391 return NULL;
392 } else {
393 return dirp;
394 }
395 }
396
397 // Close the directory and restore the current working directory.
398 //
399 static void close_directory_secure_cwd(DIR* dirp, int saved_cwd_fd) {
400
401 int result;
402 // If we have a saved cwd change back to it and close the fd.
403 if (saved_cwd_fd != -1) {
404 result = fchdir(saved_cwd_fd);
405 ::close(saved_cwd_fd);
406 }
407
408 // Close the directory.
409 os::closedir(dirp);
410 }
411
412 // Check if the given file descriptor is considered a secure.
413 //
414 static bool is_file_secure(int fd, const char *filename) {
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