+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * test_kprobes.c - simple sanity test for *probes
- *
- * Copyright IBM Corp. 2008
- */
-
-#include <linux/kernel.h>
-#include <linux/kprobes.h>
-#include <linux/random.h>
-#include <kunit/test.h>
-
-#define div_factor 3
-
-static u32 rand1, preh_val, posth_val;
-static u32 (*target)(u32 value);
-static u32 (*target2)(u32 value);
-static struct kunit *current_test;
-
-static unsigned long (*internal_target)(void);
-static unsigned long (*stacktrace_target)(void);
-static unsigned long (*stacktrace_driver)(void);
-static unsigned long target_return_address[2];
-
-static noinline u32 kprobe_target(u32 value)
-{
- return (value / div_factor);
-}
-
-static int kp_pre_handler(struct kprobe *p, struct pt_regs *regs)
-{
- KUNIT_EXPECT_FALSE(current_test, preemptible());
- preh_val = (rand1 / div_factor);
- return 0;
-}
-
-static void kp_post_handler(struct kprobe *p, struct pt_regs *regs,
- unsigned long flags)
-{
- KUNIT_EXPECT_FALSE(current_test, preemptible());
- KUNIT_EXPECT_EQ(current_test, preh_val, (rand1 / div_factor));
- posth_val = preh_val + div_factor;
-}
-
-static struct kprobe kp = {
- .symbol_name = "kprobe_target",
- .pre_handler = kp_pre_handler,
- .post_handler = kp_post_handler
-};
-
-static void test_kprobe(struct kunit *test)
-{
- current_test = test;
- KUNIT_EXPECT_EQ(test, 0, register_kprobe(&kp));
- target(rand1);
- unregister_kprobe(&kp);
- KUNIT_EXPECT_NE(test, 0, preh_val);
- KUNIT_EXPECT_NE(test, 0, posth_val);
-}
-
-static noinline u32 kprobe_target2(u32 value)
-{
- return (value / div_factor) + 1;
-}
-
-static noinline unsigned long kprobe_stacktrace_internal_target(void)
-{
- if (!target_return_address[0])
- target_return_address[0] = (unsigned long)__builtin_return_address(0);
- return target_return_address[0];
-}
-
-static noinline unsigned long kprobe_stacktrace_target(void)
-{
- if (!target_return_address[1])
- target_return_address[1] = (unsigned long)__builtin_return_address(0);
-
- if (internal_target)
- internal_target();
-
- return target_return_address[1];
-}
-
-static noinline unsigned long kprobe_stacktrace_driver(void)
-{
- if (stacktrace_target)
- stacktrace_target();
-
- /* This is for preventing inlining the function */
- return (unsigned long)__builtin_return_address(0);
-}
-
-static int kp_pre_handler2(struct kprobe *p, struct pt_regs *regs)
-{
- preh_val = (rand1 / div_factor) + 1;
- return 0;
-}
-
-static void kp_post_handler2(struct kprobe *p, struct pt_regs *regs,
- unsigned long flags)
-{
- KUNIT_EXPECT_EQ(current_test, preh_val, (rand1 / div_factor) + 1);
- posth_val = preh_val + div_factor;
-}
-
-static struct kprobe kp2 = {
- .symbol_name = "kprobe_target2",
- .pre_handler = kp_pre_handler2,
- .post_handler = kp_post_handler2
-};
-
-static void test_kprobes(struct kunit *test)
-{
- struct kprobe *kps[2] = {&kp, &kp2};
-
- current_test = test;
-
- /* addr and flags should be cleard for reusing kprobe. */
- kp.addr = NULL;
- kp.flags = 0;
-
- KUNIT_EXPECT_EQ(test, 0, register_kprobes(kps, 2));
- preh_val = 0;
- posth_val = 0;
- target(rand1);
-
- KUNIT_EXPECT_NE(test, 0, preh_val);
- KUNIT_EXPECT_NE(test, 0, posth_val);
-
- preh_val = 0;
- posth_val = 0;
- target2(rand1);
-
- KUNIT_EXPECT_NE(test, 0, preh_val);
- KUNIT_EXPECT_NE(test, 0, posth_val);
- unregister_kprobes(kps, 2);
-}
-
-#ifdef CONFIG_KRETPROBES
-static u32 krph_val;
-
-static int entry_handler(struct kretprobe_instance *ri, struct pt_regs *regs)
-{
- KUNIT_EXPECT_FALSE(current_test, preemptible());
- krph_val = (rand1 / div_factor);
- return 0;
-}
-
-static int return_handler(struct kretprobe_instance *ri, struct pt_regs *regs)
-{
- unsigned long ret = regs_return_value(regs);
-
- KUNIT_EXPECT_FALSE(current_test, preemptible());
- KUNIT_EXPECT_EQ(current_test, ret, rand1 / div_factor);
- KUNIT_EXPECT_NE(current_test, krph_val, 0);
- krph_val = rand1;
- return 0;
-}
-
-static struct kretprobe rp = {
- .handler = return_handler,
- .entry_handler = entry_handler,
- .kp.symbol_name = "kprobe_target"
-};
-
-static void test_kretprobe(struct kunit *test)
-{
- current_test = test;
- KUNIT_EXPECT_EQ(test, 0, register_kretprobe(&rp));
- target(rand1);
- unregister_kretprobe(&rp);
- KUNIT_EXPECT_EQ(test, krph_val, rand1);
-}
-
-static int return_handler2(struct kretprobe_instance *ri, struct pt_regs *regs)
-{
- unsigned long ret = regs_return_value(regs);
-
- KUNIT_EXPECT_EQ(current_test, ret, (rand1 / div_factor) + 1);
- KUNIT_EXPECT_NE(current_test, krph_val, 0);
- krph_val = rand1;
- return 0;
-}
-
-static struct kretprobe rp2 = {
- .handler = return_handler2,
- .entry_handler = entry_handler,
- .kp.symbol_name = "kprobe_target2"
-};
-
-static void test_kretprobes(struct kunit *test)
-{
- struct kretprobe *rps[2] = {&rp, &rp2};
-
- current_test = test;
- /* addr and flags should be cleard for reusing kprobe. */
- rp.kp.addr = NULL;
- rp.kp.flags = 0;
- KUNIT_EXPECT_EQ(test, 0, register_kretprobes(rps, 2));
-
- krph_val = 0;
- target(rand1);
- KUNIT_EXPECT_EQ(test, krph_val, rand1);
-
- krph_val = 0;
- target2(rand1);
- KUNIT_EXPECT_EQ(test, krph_val, rand1);
- unregister_kretprobes(rps, 2);
-}
-
-#ifdef CONFIG_ARCH_CORRECT_STACKTRACE_ON_KRETPROBE
-#define STACK_BUF_SIZE 16
-static unsigned long stack_buf[STACK_BUF_SIZE];
-
-static int stacktrace_return_handler(struct kretprobe_instance *ri, struct pt_regs *regs)
-{
- unsigned long retval = regs_return_value(regs);
- int i, ret;
-
- KUNIT_EXPECT_FALSE(current_test, preemptible());
- KUNIT_EXPECT_EQ(current_test, retval, target_return_address[1]);
-
- /*
- * Test stacktrace inside the kretprobe handler, this will involves
- * kretprobe trampoline, but must include correct return address
- * of the target function.
- */
- ret = stack_trace_save(stack_buf, STACK_BUF_SIZE, 0);
- KUNIT_EXPECT_NE(current_test, ret, 0);
-
- for (i = 0; i < ret; i++) {
- if (stack_buf[i] == target_return_address[1])
- break;
- }
- KUNIT_EXPECT_NE(current_test, i, ret);
-
-#if !IS_MODULE(CONFIG_KPROBES_SANITY_TEST)
- /*
- * Test stacktrace from pt_regs at the return address. Thus the stack
- * trace must start from the target return address.
- */
- ret = stack_trace_save_regs(regs, stack_buf, STACK_BUF_SIZE, 0);
- KUNIT_EXPECT_NE(current_test, ret, 0);
- KUNIT_EXPECT_EQ(current_test, stack_buf[0], target_return_address[1]);
-#endif
-
- return 0;
-}
-
-static struct kretprobe rp3 = {
- .handler = stacktrace_return_handler,
- .kp.symbol_name = "kprobe_stacktrace_target"
-};
-
-static void test_stacktrace_on_kretprobe(struct kunit *test)
-{
- unsigned long myretaddr = (unsigned long)__builtin_return_address(0);
-
- current_test = test;
- rp3.kp.addr = NULL;
- rp3.kp.flags = 0;
-
- /*
- * Run the stacktrace_driver() to record correct return address in
- * stacktrace_target() and ensure stacktrace_driver() call is not
- * inlined by checking the return address of stacktrace_driver()
- * and the return address of this function is different.
- */
- KUNIT_ASSERT_NE(test, myretaddr, stacktrace_driver());
-
- KUNIT_ASSERT_EQ(test, 0, register_kretprobe(&rp3));
- KUNIT_ASSERT_NE(test, myretaddr, stacktrace_driver());
- unregister_kretprobe(&rp3);
-}
-
-static int stacktrace_internal_return_handler(struct kretprobe_instance *ri, struct pt_regs *regs)
-{
- unsigned long retval = regs_return_value(regs);
- int i, ret;
-
- KUNIT_EXPECT_FALSE(current_test, preemptible());
- KUNIT_EXPECT_EQ(current_test, retval, target_return_address[0]);
-
- /*
- * Test stacktrace inside the kretprobe handler for nested case.
- * The unwinder will find the kretprobe_trampoline address on the
- * return address, and kretprobe must solve that.
- */
- ret = stack_trace_save(stack_buf, STACK_BUF_SIZE, 0);
- KUNIT_EXPECT_NE(current_test, ret, 0);
-
- for (i = 0; i < ret - 1; i++) {
- if (stack_buf[i] == target_return_address[0]) {
- KUNIT_EXPECT_EQ(current_test, stack_buf[i + 1], target_return_address[1]);
- break;
- }
- }
- KUNIT_EXPECT_NE(current_test, i, ret);
-
-#if !IS_MODULE(CONFIG_KPROBES_SANITY_TEST)
- /* Ditto for the regs version. */
- ret = stack_trace_save_regs(regs, stack_buf, STACK_BUF_SIZE, 0);
- KUNIT_EXPECT_NE(current_test, ret, 0);
- KUNIT_EXPECT_EQ(current_test, stack_buf[0], target_return_address[0]);
- KUNIT_EXPECT_EQ(current_test, stack_buf[1], target_return_address[1]);
-#endif
-
- return 0;
-}
-
-static struct kretprobe rp4 = {
- .handler = stacktrace_internal_return_handler,
- .kp.symbol_name = "kprobe_stacktrace_internal_target"
-};
-
-static void test_stacktrace_on_nested_kretprobe(struct kunit *test)
-{
- unsigned long myretaddr = (unsigned long)__builtin_return_address(0);
- struct kretprobe *rps[2] = {&rp3, &rp4};
-
- current_test = test;
- rp3.kp.addr = NULL;
- rp3.kp.flags = 0;
-
- //KUNIT_ASSERT_NE(test, myretaddr, stacktrace_driver());
-
- KUNIT_ASSERT_EQ(test, 0, register_kretprobes(rps, 2));
- KUNIT_ASSERT_NE(test, myretaddr, stacktrace_driver());
- unregister_kretprobes(rps, 2);
-}
-#endif /* CONFIG_ARCH_CORRECT_STACKTRACE_ON_KRETPROBE */
-
-#endif /* CONFIG_KRETPROBES */
-
-static int kprobes_test_init(struct kunit *test)
-{
- target = kprobe_target;
- target2 = kprobe_target2;
- stacktrace_target = kprobe_stacktrace_target;
- internal_target = kprobe_stacktrace_internal_target;
- stacktrace_driver = kprobe_stacktrace_driver;
-
- do {
- rand1 = prandom_u32();
- } while (rand1 <= div_factor);
- return 0;
-}
-
-static struct kunit_case kprobes_testcases[] = {
- KUNIT_CASE(test_kprobe),
- KUNIT_CASE(test_kprobes),
-#ifdef CONFIG_KRETPROBES
- KUNIT_CASE(test_kretprobe),
- KUNIT_CASE(test_kretprobes),
-#ifdef CONFIG_ARCH_CORRECT_STACKTRACE_ON_KRETPROBE
- KUNIT_CASE(test_stacktrace_on_kretprobe),
- KUNIT_CASE(test_stacktrace_on_nested_kretprobe),
-#endif
-#endif
- {}
-};
-
-static struct kunit_suite kprobes_test_suite = {
- .name = "kprobes_test",
- .init = kprobes_test_init,
- .test_cases = kprobes_testcases,
-};
-
-kunit_test_suites(&kprobes_test_suite);
-
-MODULE_LICENSE("GPL");
projects / linux-2.6-block.git / blobdiff