diff options
Diffstat (limited to 'posix/tst-glob-tilde.c')
| -rw-r--r-- | posix/tst-glob-tilde.c | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/posix/tst-glob-tilde.c b/posix/tst-glob-tilde.c new file mode 100644 index 0000000000..9518b4a6f8 --- /dev/null +++ b/posix/tst-glob-tilde.c @@ -0,0 +1,136 @@ +/* Check for GLOB_TIDLE heap allocation issues (bug 22320, bug 22325). + Copyright (C) 2017 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/>. */ + +#include <glob.h> +#include <mcheck.h> +#include <nss.h> +#include <pwd.h> +#include <stdlib.h> +#include <string.h> +#include <support/check.h> +#include <support/support.h> + +/* Flag which indicates whether to pass the GLOB_ONLYDIR flag. */ +static int do_onlydir; + +/* Flag which indicates whether to pass the GLOB_NOCHECK flag. */ +static int do_nocheck; + +/* Flag which indicates whether to pass the GLOB_MARK flag. */ +static int do_mark; + +static void +one_test (const char *prefix, const char *middle, const char *suffix) +{ + char *pattern = xasprintf ("%s%s%s", prefix, middle, suffix); + int flags = GLOB_TILDE; + if (do_onlydir) + flags |= GLOB_ONLYDIR; + if (do_nocheck) + flags |= GLOB_NOCHECK; + if (do_mark) + flags |= GLOB_MARK; + glob_t gl; + /* This glob call might result in crashes or memory leaks. */ + if (glob (pattern, flags, NULL, &gl) == 0) + globfree (&gl); + free (pattern); +} + +enum + { + /* The largest base being tested. */ + largest_base_size = 500000, + + /* The actual size is the base size plus a variable whose absolute + value is not greater than this. This helps malloc to trigger + overflows. */ + max_size_skew = 16, + + /* The maximum string length supported by repeating_string + below. */ + repeat_size = largest_base_size + max_size_skew, + }; + +/* Used to construct strings which repeat a single character 'x'. */ +static char *repeat; + +/* Return a string of SIZE characters. */ +const char * +repeating_string (int size) +{ + TEST_VERIFY (size >= 0); + TEST_VERIFY (size <= repeat_size); + const char *repeated_shifted = repeat + repeat_size - size; + TEST_VERIFY (strlen (repeated_shifted) == size); + return repeated_shifted; +} + +static int +do_test (void) +{ + /* Avoid network-based NSS modules and initialize nss_files with a + dummy lookup. This has to come before mtrace because NSS does + not free all memory. */ + __nss_configure_lookup ("passwd", "files"); + (void) getpwnam ("root"); + + mtrace (); + + repeat = xmalloc (repeat_size + 1); + memset (repeat, 'x', repeat_size); + repeat[repeat_size] = '\0'; + + /* These numbers control the size of the user name. The values + cover the minimum (0), a typical size (8), a large + stack-allocated size (100000), and a somewhat large + heap-allocated size (largest_base_size). */ + static const int base_sizes[] = { 0, 8, 100, 100000, largest_base_size, -1 }; + + for (do_onlydir = 0; do_onlydir < 2; ++do_onlydir) + for (do_nocheck = 0; do_nocheck < 2; ++do_nocheck) + for (do_mark = 0; do_mark < 2; ++do_mark) + for (int base_idx = 0; base_sizes[base_idx] >= 0; ++base_idx) + { + for (int size_skew = -max_size_skew; size_skew <= max_size_skew; + ++size_skew) + { + int size = base_sizes[base_idx] + size_skew; + if (size < 0) + continue; + + const char *user_name = repeating_string (size); + one_test ("~", user_name, "/a/b"); + } + + const char *user_name = repeating_string (base_sizes[base_idx]); + one_test ("~", user_name, ""); + one_test ("~", user_name, "/"); + one_test ("~", user_name, "/a"); + one_test ("~", user_name, "/*/*"); + one_test ("~", user_name, "\\/"); + one_test ("/~", user_name, ""); + one_test ("*/~", user_name, "/a/b"); + } + + free (repeat); + + return 0; +} + +#include <support/test-driver.c> |