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The kunit test that checks the longests symbol length [1], has triggered warnings in some pilelines when symbol prefixes are used [2][3]. The test will to depend on !PREFIX_SYMBOLS and !CFI_CLANG as sujested in [4] and on !GCOV_KERNEL. [1] https://lore.kernel.org/rust-for-linux/CABVgOSm=5Q0fM6neBhxSbOUHBgNzmwf2V22vsYC10YRBT=kN1g@mail.gmail.com/T/#t [2] https://lore.kernel.org/all/20250328112156.2614513-1-arnd@kernel.org/T/#u [3] https://lore.kernel.org/rust-for-linux/bbd03b37-c4d9-4a92-9be2-75aaf8c19815@infradead.org/T/#t [4] https://lore.kernel.org/linux-kselftest/20250427200916.GA1661412@ax162/T/#t Link: https://lore.kernel.org/r/20250706201855.232451-1-sergio.collado@gmail.com Reviewed-by: Rae Moar <rmoar@google.com> Signed-off-by: Sergio González Collado <sergio.collado@gmail.com> Acked-by: Randy Dunlap <rdunlap@infradead.org> Tested-by: Randy Dunlap <rdunlap@infradead.org> Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
81 lines
2.3 KiB
C
81 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Test the longest symbol length. Execute with:
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* ./tools/testing/kunit/kunit.py run longest-symbol
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* --arch=x86_64 --kconfig_add CONFIG_KPROBES=y --kconfig_add CONFIG_MODULES=y
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* --kconfig_add CONFIG_CPU_MITIGATIONS=n --kconfig_add CONFIG_GCOV_KERNEL=n
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <kunit/test.h>
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#include <linux/stringify.h>
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#include <linux/kprobes.h>
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#include <linux/kallsyms.h>
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#define DI(name) s##name##name
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#define DDI(name) DI(n##name##name)
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#define DDDI(name) DDI(n##name##name)
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#define DDDDI(name) DDDI(n##name##name)
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#define DDDDDI(name) DDDDI(n##name##name)
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/*Generate a symbol whose name length is 511 */
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#define LONGEST_SYM_NAME DDDDDI(g1h2i3j4k5l6m7n)
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#define RETURN_LONGEST_SYM 0xAAAAA
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noinline int LONGEST_SYM_NAME(void);
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noinline int LONGEST_SYM_NAME(void)
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{
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return RETURN_LONGEST_SYM;
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}
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_Static_assert(sizeof(__stringify(LONGEST_SYM_NAME)) == KSYM_NAME_LEN,
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"Incorrect symbol length found. Expected KSYM_NAME_LEN: "
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__stringify(KSYM_NAME_LEN) ", but found: "
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__stringify(sizeof(LONGEST_SYM_NAME)));
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static void test_longest_symbol(struct kunit *test)
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{
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KUNIT_EXPECT_EQ(test, RETURN_LONGEST_SYM, LONGEST_SYM_NAME());
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};
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static void test_longest_symbol_kallsyms(struct kunit *test)
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{
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unsigned long (*kallsyms_lookup_name)(const char *name);
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static int (*longest_sym)(void);
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struct kprobe kp = {
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.symbol_name = "kallsyms_lookup_name",
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};
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if (register_kprobe(&kp) < 0) {
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pr_info("%s: kprobe not registered", __func__);
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KUNIT_FAIL(test, "test_longest_symbol kallsyms: kprobe not registered\n");
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return;
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}
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kunit_warn(test, "test_longest_symbol kallsyms: kprobe registered\n");
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kallsyms_lookup_name = (unsigned long (*)(const char *name))kp.addr;
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unregister_kprobe(&kp);
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longest_sym =
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(void *) kallsyms_lookup_name(__stringify(LONGEST_SYM_NAME));
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KUNIT_EXPECT_EQ(test, RETURN_LONGEST_SYM, longest_sym());
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};
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static struct kunit_case longest_symbol_test_cases[] = {
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KUNIT_CASE(test_longest_symbol),
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KUNIT_CASE(test_longest_symbol_kallsyms),
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{}
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};
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static struct kunit_suite longest_symbol_test_suite = {
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.name = "longest-symbol",
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.test_cases = longest_symbol_test_cases,
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};
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kunit_test_suite(longest_symbol_test_suite);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Test the longest symbol length");
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MODULE_AUTHOR("Sergio González Collado");
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