From 4617721c502b2ddaa4e324e86da4997edf738fa5 Mon Sep 17 00:00:00 2001 From: Steven Rostedt Date: Wed, 2 Sep 2026 09:55:01 -0400 Subject: ftrace: Synchronize the initialization of ftrace_ops There's some internal state that ftrace_ops needs to have set, but since it can be declared outside of the ftrace.c code, it calls ftrace_ops_init() on the ops in every global function. The issue is that if two tasks call it on the same ops at the same time it is possible to have the initialization of one corrupt the initialization of the other call. Create a ops_mutex to use to synchronize every initialization of the ftrace_ops. The mutex is taken within checking the ftrace_ops flag that states it was initializied but the flag is checked again after the mutex has been taken. Checking first outside the mutex allows it to shortcut having to take the mutex. But then the check needs to be done again after the mute is taken in case of races. Cc: stable@vger.kernel.org Link: https://patch.msgid.link/20260902095501.6b59af20@gandalf.local.home Fixes: f04f24fb7e48d ("ftrace, kprobes: Fix a deadlock on ftrace_regex_lock") Reported-by: sashiko-bot@kernel.org Close: https://lore.kernel.org/all/20260829025528.49A831F000E9@smtp.kernel.org/ Signed-off-by: Steven Rostedt --- lib/tests/glob_kunit.c | 125 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 125 insertions(+) create mode 100644 lib/tests/glob_kunit.c (limited to 'lib/tests/glob_kunit.c') diff --git a/lib/tests/glob_kunit.c b/lib/tests/glob_kunit.c new file mode 100644 index 000000000..362b1eda8 --- /dev/null +++ b/lib/tests/glob_kunit.c @@ -0,0 +1,125 @@ +// SPDX-License-Identifier: MIT OR GPL-2.0 +/* + * Test cases for glob functions. + */ + +#include +#include +#include + +/** + * struct glob_test_case - Test case for glob matching. + * @pat: Pattern to match. + * @str: String to match against. + * @expected: Expected glob_match result, true if matched. + */ +struct glob_test_case { + const char *pat; + const char *str; + bool expected; +}; + +static const struct glob_test_case glob_test_cases[] = { + /* Some basic tests */ + { .pat = "a", .str = "a", .expected = true }, + { .pat = "a", .str = "b", .expected = false }, + { .pat = "a", .str = "aa", .expected = false }, + { .pat = "a", .str = "", .expected = false }, + { .pat = "", .str = "", .expected = true }, + { .pat = "", .str = "a", .expected = false }, + /* Simple character class tests */ + { .pat = "[a]", .str = "a", .expected = true }, + { .pat = "[a]", .str = "b", .expected = false }, + { .pat = "[!a]", .str = "a", .expected = false }, + { .pat = "[!a]", .str = "b", .expected = true }, + { .pat = "[ab]", .str = "a", .expected = true }, + { .pat = "[ab]", .str = "b", .expected = true }, + { .pat = "[ab]", .str = "c", .expected = false }, + { .pat = "[!ab]", .str = "c", .expected = true }, + { .pat = "[a-c]", .str = "b", .expected = true }, + { .pat = "[a-c]", .str = "d", .expected = false }, + /* Corner cases in character class parsing */ + { .pat = "[a-c-e-g]", .str = "-", .expected = true }, + { .pat = "[a-c-e-g]", .str = "d", .expected = false }, + { .pat = "[a-c-e-g]", .str = "f", .expected = true }, + { .pat = "[]a-ceg-ik[]", .str = "a", .expected = true }, + { .pat = "[]a-ceg-ik[]", .str = "]", .expected = true }, + { .pat = "[]a-ceg-ik[]", .str = "[", .expected = true }, + { .pat = "[]a-ceg-ik[]", .str = "h", .expected = true }, + { .pat = "[]a-ceg-ik[]", .str = "f", .expected = false }, + { .pat = "[!]a-ceg-ik[]", .str = "h", .expected = false }, + { .pat = "[!]a-ceg-ik[]", .str = "]", .expected = false }, + { .pat = "[!]a-ceg-ik[]", .str = "f", .expected = true }, + /* Simple wild cards */ + { .pat = "?", .str = "a", .expected = true }, + { .pat = "?", .str = "aa", .expected = false }, + { .pat = "??", .str = "a", .expected = false }, + { .pat = "?x?", .str = "axb", .expected = true }, + { .pat = "?x?", .str = "abx", .expected = false }, + { .pat = "?x?", .str = "xab", .expected = false }, + /* Asterisk wild cards (backtracking) */ + { .pat = "*??", .str = "a", .expected = false }, + { .pat = "*??", .str = "ab", .expected = true }, + { .pat = "*??", .str = "abc", .expected = true }, + { .pat = "*??", .str = "abcd", .expected = true }, + { .pat = "??*", .str = "a", .expected = false }, + { .pat = "??*", .str = "ab", .expected = true }, + { .pat = "??*", .str = "abc", .expected = true }, + { .pat = "??*", .str = "abcd", .expected = true }, + { .pat = "?*?", .str = "a", .expected = false }, + { .pat = "?*?", .str = "ab", .expected = true }, + { .pat = "?*?", .str = "abc", .expected = true }, + { .pat = "?*?", .str = "abcd", .expected = true }, + { .pat = "*b", .str = "b", .expected = true }, + { .pat = "*b", .str = "ab", .expected = true }, + { .pat = "*b", .str = "ba", .expected = false }, + { .pat = "*b", .str = "bb", .expected = true }, + { .pat = "*b", .str = "abb", .expected = true }, + { .pat = "*b", .str = "bab", .expected = true }, + { .pat = "*bc", .str = "abbc", .expected = true }, + { .pat = "*bc", .str = "bc", .expected = true }, + { .pat = "*bc", .str = "bbc", .expected = true }, + { .pat = "*bc", .str = "bcbc", .expected = true }, + /* Multiple asterisks (complex backtracking) */ + { .pat = "*ac*", .str = "abacadaeafag", .expected = true }, + { .pat = "*ac*ae*ag*", .str = "abacadaeafag", .expected = true }, + { .pat = "*a*b*[bc]*[ef]*g*", .str = "abacadaeafag", .expected = true }, + { .pat = "*a*b*[ef]*[cd]*g*", .str = "abacadaeafag", .expected = false }, + { .pat = "*abcd*", .str = "abcabcabcabcdefg", .expected = true }, + { .pat = "*ab*cd*", .str = "abcabcabcabcdefg", .expected = true }, + { .pat = "*abcd*abcdef*", .str = "abcabcdabcdeabcdefg", .expected = true }, + { .pat = "*abcd*", .str = "abcabcabcabcefg", .expected = false }, + { .pat = "*ab*cd*", .str = "abcabcabcabcefg", .expected = false }, +}; + +static void glob_case_to_desc(const struct glob_test_case *t, char *desc) +{ + snprintf(desc, KUNIT_PARAM_DESC_SIZE, "pat:\"%s\" str:\"%s\"", t->pat, t->str); +} + +KUNIT_ARRAY_PARAM(glob, glob_test_cases, glob_case_to_desc); + +static void glob_test_match(struct kunit *test) +{ + const struct glob_test_case *params = test->param_value; + + KUNIT_EXPECT_EQ_MSG(test, + glob_match(params->pat, params->str), + params->expected, + "Pattern: \"%s\", String: \"%s\", Expected: %d", + params->pat, params->str, params->expected); +} + +static struct kunit_case glob_kunit_test_cases[] = { + KUNIT_CASE_PARAM(glob_test_match, glob_gen_params), + {} +}; + +static struct kunit_suite glob_test_suite = { + .name = "glob", + .test_cases = glob_kunit_test_cases, +}; + +kunit_test_suite(glob_test_suite); +MODULE_DESCRIPTION("Test cases for glob functions"); +MODULE_LICENSE("Dual MIT/GPL"); -- cgit v1.3.1