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227 lines
7.6 KiB
227 lines
7.6 KiB
9 months ago
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commit 0b79004569e5ce1669136b8c41564c3809730f15
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Author: Florian Weimer <fweimer@redhat.com>
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Date: Tue Aug 28 12:57:46 2018 +0200
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regex: Add test tst-regcomp-truncated [BZ #23578]
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(cherry picked from commit 761404b74d9853ce1608195e24f25b78a910591a)
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diff --git a/posix/Makefile b/posix/Makefile
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index 00c62841a282f15a..83162123f9c927a0 100644
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--- a/posix/Makefile
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+++ b/posix/Makefile
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@@ -96,7 +96,7 @@ tests := test-errno tstgetopt testfnm runtests runptests \
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tst-posix_fadvise tst-posix_fadvise64 \
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tst-sysconf-empty-chroot tst-glob_symlinks tst-fexecve \
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tst-glob-tilde test-ssize-max tst-spawn4 bug-regex37 \
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- bug-regex38
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+ bug-regex38 tst-regcomp-truncated
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tests-internal := bug-regex5 bug-regex20 bug-regex33 \
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tst-rfc3484 tst-rfc3484-2 tst-rfc3484-3 \
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tst-glob_lstat_compat tst-spawn4-compat
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@@ -194,6 +194,7 @@ $(objpfx)tst-regex2.out: $(gen-locales)
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$(objpfx)tst-regexloc.out: $(gen-locales)
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$(objpfx)tst-rxspencer.out: $(gen-locales)
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$(objpfx)tst-rxspencer-no-utf8.out: $(gen-locales)
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+$(objpfx)tst-regcomp-truncated.out: $(gen-locales)
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endif
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# If we will use the generic uname implementation, we must figure out what
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diff --git a/posix/tst-regcomp-truncated.c b/posix/tst-regcomp-truncated.c
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new file mode 100644
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index 0000000000000000..a4a1581bbc2b39eb
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--- /dev/null
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+++ b/posix/tst-regcomp-truncated.c
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@@ -0,0 +1,191 @@
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+/* Test compilation of truncated regular expressions.
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+ Copyright (C) 2018 Free Software Foundation, Inc.
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+ This file is part of the GNU C Library.
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+
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+ The GNU C Library is free software; you can redistribute it and/or
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+ modify it under the terms of the GNU Lesser General Public
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+ License as published by the Free Software Foundation; either
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+ version 2.1 of the License, or (at your option) any later version.
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+
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+ The GNU C Library is distributed in the hope that it will be useful,
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ Lesser General Public License for more details.
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+
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+ You should have received a copy of the GNU Lesser General Public
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+ License along with the GNU C Library; if not, see
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+ <http://www.gnu.org/licenses/>. */
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+
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+/* This test constructs various patterns in an attempt to trigger
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+ over-reading the regular expression compiler, such as bug
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+ 23578. */
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+
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+#include <array_length.h>
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+#include <errno.h>
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+#include <locale.h>
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+#include <regex.h>
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+#include <stdio.h>
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+#include <stdlib.h>
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+#include <string.h>
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+#include <support/check.h>
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+#include <support/next_to_fault.h>
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+#include <support/support.h>
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+#include <support/test-driver.h>
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+#include <wchar.h>
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+
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+/* Locales to test. */
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+static const char locales[][17] =
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+ {
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+ "C",
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+ "en_US.UTF-8",
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+ "de_DE.ISO-8859-1",
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+ };
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+
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+/* Syntax options. Will be combined with other flags. */
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+static const reg_syntax_t syntaxes[] =
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+ {
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+ RE_SYNTAX_EMACS,
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+ RE_SYNTAX_AWK,
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+ RE_SYNTAX_GNU_AWK,
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+ RE_SYNTAX_POSIX_AWK,
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+ RE_SYNTAX_GREP,
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+ RE_SYNTAX_EGREP,
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+ RE_SYNTAX_POSIX_EGREP,
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+ RE_SYNTAX_POSIX_BASIC,
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+ RE_SYNTAX_POSIX_EXTENDED,
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+ RE_SYNTAX_POSIX_MINIMAL_EXTENDED,
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+ };
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+
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+/* Trailing characters placed after the initial character. */
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+static const char trailing_strings[][4] =
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+ {
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+ "",
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+ "[",
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+ "\\",
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+ "[\\",
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+ "(",
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+ "(\\",
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+ "\\(",
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+ };
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+
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+static int
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+do_test (void)
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+{
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+ /* Staging buffer for the constructed regular expression. */
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+ char buffer[16];
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+
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+ /* Allocation used to detect over-reading by the regular expression
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+ compiler. */
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+ struct support_next_to_fault ntf
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+ = support_next_to_fault_allocate (sizeof (buffer));
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+
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+ /* Arbitrary Unicode codepoint at which we stop generating
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+ characters. We do not probe the whole range because that would
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+ take too long due to combinatorical exploision as the result of
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+ combination with other flags. */
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+ static const wchar_t last_character = 0xfff;
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+
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+ for (size_t locale_idx = 0; locale_idx < array_length (locales);
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+ ++ locale_idx)
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+ {
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+ if (setlocale (LC_ALL, locales[locale_idx]) == NULL)
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+ {
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+ support_record_failure ();
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+ printf ("error: setlocale (\"%s\"): %m", locales[locale_idx]);
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+ continue;
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+ }
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+ if (test_verbose > 0)
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+ printf ("info: testing locale \"%s\"\n", locales[locale_idx]);
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+
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+ for (wchar_t wc = 0; wc <= last_character; ++wc)
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+ {
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+ char *after_wc;
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+ if (wc == 0)
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+ {
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+ /* wcrtomb treats L'\0' in a special way. */
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+ *buffer = '\0';
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+ after_wc = &buffer[1];
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+ }
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+ else
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+ {
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+ mbstate_t ps = { };
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+ size_t ret = wcrtomb (buffer, wc, &ps);
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+ if (ret == (size_t) -1)
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+ {
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+ /* EILSEQ means that the target character set
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+ cannot encode the character. */
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+ if (errno != EILSEQ)
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+ {
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+ support_record_failure ();
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+ printf ("error: wcrtomb (0x%x) failed: %m\n",
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+ (unsigned) wc);
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+ }
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+ continue;
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+ }
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+ TEST_VERIFY_EXIT (ret != 0);
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+ after_wc = &buffer[ret];
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+ }
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+
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+ for (size_t trailing_idx = 0;
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+ trailing_idx < array_length (trailing_strings);
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+ ++trailing_idx)
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+ {
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+ char *after_trailing
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+ = stpcpy (after_wc, trailing_strings[trailing_idx]);
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+
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+ for (int do_nul = 0; do_nul < 2; ++do_nul)
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+ {
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+ char *after_nul;
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+ if (do_nul)
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+ {
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+ *after_trailing = '\0';
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+ after_nul = &after_trailing[1];
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+ }
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+ else
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+ after_nul = after_trailing;
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+
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+ size_t length = after_nul - buffer;
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+
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+ /* Make sure that the faulting region starts
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+ after the used portion of the buffer. */
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+ char *ntf_start = ntf.buffer + sizeof (buffer) - length;
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+ memcpy (ntf_start, buffer, length);
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+
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+ for (const reg_syntax_t *psyntax = syntaxes;
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+ psyntax < array_end (syntaxes); ++psyntax)
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+ for (int do_icase = 0; do_icase < 2; ++do_icase)
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+ {
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+ re_syntax_options = *psyntax;
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+ if (do_icase)
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+ re_syntax_options |= RE_ICASE;
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+
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+ regex_t reg;
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+ memset (®, 0, sizeof (reg));
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+ const char *msg = re_compile_pattern
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+ (ntf_start, length, ®);
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+ if (msg != NULL)
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+ {
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+ if (test_verbose > 0)
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+ {
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+ char *quoted = support_quote_blob
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+ (buffer, length);
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+ printf ("info: compilation failed for pattern"
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+ " \"%s\", syntax 0x%lx: %s\n",
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+ quoted, re_syntax_options, msg);
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+ free (quoted);
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+ }
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+ }
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+ else
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+ regfree (®);
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+ }
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+ }
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+ }
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+ }
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+ }
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+
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+ support_next_to_fault_free (&ntf);
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+
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+ return 0;
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+}
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+
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+#include <support/test-driver.c>
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