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-rw-r--r--lib/test_fprobe.c176
1 files changed, 176 insertions, 0 deletions
diff --git a/lib/test_fprobe.c b/lib/test_fprobe.c
new file mode 100644
index 000000000..34fa5a5bb
--- /dev/null
+++ b/lib/test_fprobe.c
@@ -0,0 +1,176 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * test_fprobe.c - simple sanity test for fprobe
+ */
+
+#include <linux/kernel.h>
+#include <linux/fprobe.h>
+#include <linux/random.h>
+#include <kunit/test.h>
+
+#define div_factor 3
+
+static struct kunit *current_test;
+
+static u32 rand1, entry_val, exit_val;
+
+/* Use indirect calls to avoid inlining the target functions */
+static u32 (*target)(u32 value);
+static u32 (*target2)(u32 value);
+static unsigned long target_ip;
+static unsigned long target2_ip;
+
+static noinline u32 fprobe_selftest_target(u32 value)
+{
+ return (value / div_factor);
+}
+
+static noinline u32 fprobe_selftest_target2(u32 value)
+{
+ return (value / div_factor) + 1;
+}
+
+static notrace void fp_entry_handler(struct fprobe *fp, unsigned long ip,
+ struct pt_regs *regs, void *data)
+{
+ KUNIT_EXPECT_FALSE(current_test, preemptible());
+ /* This can be called on the fprobe_selftest_target and the fprobe_selftest_target2 */
+ if (ip != target_ip)
+ KUNIT_EXPECT_EQ(current_test, ip, target2_ip);
+ entry_val = (rand1 / div_factor);
+}
+
+static notrace void fp_exit_handler(struct fprobe *fp, unsigned long ip,
+ struct pt_regs *regs, void *data)
+{
+ unsigned long ret = regs_return_value(regs);
+
+ KUNIT_EXPECT_FALSE(current_test, preemptible());
+ if (ip != target_ip) {
+ KUNIT_EXPECT_EQ(current_test, ip, target2_ip);
+ KUNIT_EXPECT_EQ(current_test, ret, (rand1 / div_factor) + 1);
+ } else
+ KUNIT_EXPECT_EQ(current_test, ret, (rand1 / div_factor));
+ KUNIT_EXPECT_EQ(current_test, entry_val, (rand1 / div_factor));
+ exit_val = entry_val + div_factor;
+}
+
+/* Test entry only (no rethook) */
+static void test_fprobe_entry(struct kunit *test)
+{
+ struct fprobe fp_entry = {
+ .entry_handler = fp_entry_handler,
+ };
+
+ current_test = test;
+
+ /* Before register, unregister should be failed. */
+ KUNIT_EXPECT_NE(test, 0, unregister_fprobe(&fp_entry));
+ KUNIT_EXPECT_EQ(test, 0, register_fprobe(&fp_entry, "fprobe_selftest_target*", NULL));
+
+ entry_val = 0;
+ exit_val = 0;
+ target(rand1);
+ KUNIT_EXPECT_NE(test, 0, entry_val);
+ KUNIT_EXPECT_EQ(test, 0, exit_val);
+
+ entry_val = 0;
+ exit_val = 0;
+ target2(rand1);
+ KUNIT_EXPECT_NE(test, 0, entry_val);
+ KUNIT_EXPECT_EQ(test, 0, exit_val);
+
+ KUNIT_EXPECT_EQ(test, 0, unregister_fprobe(&fp_entry));
+}
+
+static void test_fprobe(struct kunit *test)
+{
+ struct fprobe fp = {
+ .entry_handler = fp_entry_handler,
+ .exit_handler = fp_exit_handler,
+ };
+
+ current_test = test;
+ KUNIT_EXPECT_EQ(test, 0, register_fprobe(&fp, "fprobe_selftest_target*", NULL));
+
+ entry_val = 0;
+ exit_val = 0;
+ target(rand1);
+ KUNIT_EXPECT_NE(test, 0, entry_val);
+ KUNIT_EXPECT_EQ(test, entry_val + div_factor, exit_val);
+
+ entry_val = 0;
+ exit_val = 0;
+ target2(rand1);
+ KUNIT_EXPECT_NE(test, 0, entry_val);
+ KUNIT_EXPECT_EQ(test, entry_val + div_factor, exit_val);
+
+ KUNIT_EXPECT_EQ(test, 0, unregister_fprobe(&fp));
+}
+
+static void test_fprobe_syms(struct kunit *test)
+{
+ static const char *syms[] = {"fprobe_selftest_target", "fprobe_selftest_target2"};
+ struct fprobe fp = {
+ .entry_handler = fp_entry_handler,
+ .exit_handler = fp_exit_handler,
+ };
+
+ current_test = test;
+ KUNIT_EXPECT_EQ(test, 0, register_fprobe_syms(&fp, syms, 2));
+
+ entry_val = 0;
+ exit_val = 0;
+ target(rand1);
+ KUNIT_EXPECT_NE(test, 0, entry_val);
+ KUNIT_EXPECT_EQ(test, entry_val + div_factor, exit_val);
+
+ entry_val = 0;
+ exit_val = 0;
+ target2(rand1);
+ KUNIT_EXPECT_NE(test, 0, entry_val);
+ KUNIT_EXPECT_EQ(test, entry_val + div_factor, exit_val);
+
+ KUNIT_EXPECT_EQ(test, 0, unregister_fprobe(&fp));
+}
+
+static unsigned long get_ftrace_location(void *func)
+{
+ unsigned long size, addr = (unsigned long)func;
+
+ if (!kallsyms_lookup_size_offset(addr, &size, NULL) || !size)
+ return 0;
+
+ return ftrace_location_range(addr, addr + size - 1);
+}
+
+static int fprobe_test_init(struct kunit *test)
+{
+ do {
+ rand1 = get_random_u32();
+ } while (rand1 <= div_factor);
+
+ target = fprobe_selftest_target;
+ target2 = fprobe_selftest_target2;
+ target_ip = get_ftrace_location(target);
+ target2_ip = get_ftrace_location(target2);
+
+ return 0;
+}
+
+static struct kunit_case fprobe_testcases[] = {
+ KUNIT_CASE(test_fprobe_entry),
+ KUNIT_CASE(test_fprobe),
+ KUNIT_CASE(test_fprobe_syms),
+ {}
+};
+
+static struct kunit_suite fprobe_test_suite = {
+ .name = "fprobe_test",
+ .init = fprobe_test_init,
+ .test_cases = fprobe_testcases,
+};
+
+kunit_test_suites(&fprobe_test_suite);
+
+MODULE_LICENSE("GPL");