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commit c104c16073 upstream.
The longest length of a symbol (KSYM_NAME_LEN) was increased to 512
in the reference [1]. This patch adds kunit test suite to check the longest
symbol length. These tests verify that the longest symbol length defined
is supported.
This test can also help other efforts for longer symbol length,
like [2].
The test suite defines one symbol with the longest possible length.
The first test verify that functions with names of the created
symbol, can be called or not.
The second test, verify that the symbols are created (or
not) in the kernel symbol table.
[1] https://lore.kernel.org/lkml/20220802015052.10452-6-ojeda@kernel.org/
[2] https://lore.kernel.org/lkml/20240605032120.3179157-1-song@kernel.org/
Link: https://lore.kernel.org/r/20250302221518.76874-1-sergio.collado@gmail.com
Tested-by: Martin Rodriguez Reboredo <yakoyoku@gmail.com>
Reviewed-by: Shuah Khan <skhan@linuxfoundation.org>
Reviewed-by: Rae Moar <rmoar@google.com>
Signed-off-by: Sergio González Collado <sergio.collado@gmail.com>
Link: https://github.com/Rust-for-Linux/linux/issues/504
Reviewed-by: Rae Moar <rmoar@google.com>
Acked-by: David Gow <davidgow@google.com>
Signed-off-by: Shuah Khan <shuah@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
83 lines
2.4 KiB
C
83 lines
2.4 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_RETPOLINE=n --kconfig_add CONFIG_CFI_CLANG=n
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* --kconfig_add CONFIG_MITIGATION_RETPOLINE=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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