| /* Bug 22786: test for buffer overflow in realpath. |
| Copyright (C) 2018 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| /* This file must be run from within a directory called "stdlib". */ |
| |
| #include <errno.h> |
| #include <limits.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <unistd.h> |
| #include <sys/stat.h> |
| #include <sys/types.h> |
| #include <support/test-driver.h> |
| #include <libc-diag.h> |
| |
| static int |
| do_test (void) |
| { |
| const char dir[] = "bz22786"; |
| const char lnk[] = "bz22786/symlink"; |
| |
| rmdir (dir); |
| if (mkdir (dir, 0755) != 0 && errno != EEXIST) |
| { |
| printf ("mkdir %s: %m\n", dir); |
| return EXIT_FAILURE; |
| } |
| if (symlink (".", lnk) != 0 && errno != EEXIST) |
| { |
| printf ("symlink (%s, %s): %m\n", dir, lnk); |
| return EXIT_FAILURE; |
| } |
| |
| const size_t path_len = (size_t) INT_MAX + 1; |
| |
| DIAG_PUSH_NEEDS_COMMENT; |
| #if __GNUC_PREREQ (7, 0) |
| /* GCC 7 warns about too-large allocations; here we need such |
| allocation to succeed for the test to work. */ |
| DIAG_IGNORE_NEEDS_COMMENT (7, "-Walloc-size-larger-than="); |
| #endif |
| char *path = malloc (path_len); |
| DIAG_POP_NEEDS_COMMENT; |
| |
| if (path == NULL) |
| { |
| printf ("malloc (%zu): %m\n", path_len); |
| return EXIT_UNSUPPORTED; |
| } |
| |
| /* Construct very long path = "bz22786/symlink/aaaa....." */ |
| char *p = mempcpy (path, lnk, sizeof (lnk) - 1); |
| *(p++) = '/'; |
| memset (p, 'a', path_len - (path - p) - 2); |
| p[path_len - (path - p) - 1] = '\0'; |
| |
| /* This call crashes before the fix for bz22786 on 32-bit platforms. */ |
| p = realpath (path, NULL); |
| |
| if (p != NULL || errno != ENAMETOOLONG) |
| { |
| printf ("realpath: %s (%m)", p); |
| return EXIT_FAILURE; |
| } |
| |
| /* Cleanup. */ |
| unlink (lnk); |
| rmdir (dir); |
| |
| return 0; |
| } |
| |
| #define TEST_FUNCTION do_test |
| #include <support/test-driver.c> |