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Date: Tue, 14 Sep 2021 21:19:30 +0900
From: Masami Hiramatsu <mhiramat@...nel.org>
To: Sven Schnelle <svens@...ux.ibm.com>
Cc: "Naveen N . Rao" <naveen.n.rao@...ux.ibm.com>,
Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
Steven Rostedt <rostedt@...dmis.org>,
linux-kernel@...r.kernel.org, x86@...nel.org,
Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH v2] kprobes: convert tests to kunit
On Tue, 14 Sep 2021 09:08:16 +0200
Sven Schnelle <svens@...ux.ibm.com> wrote:
> This converts the kprobes testcases to use the kunit framework.
> It adds a dependency on CONFIG_KUNIT, and the output will change
> to TAP:
>
> TAP version 14
> 1..1
> # Subtest: kprobes_test
> 1..4
> random: crng init done
> ok 1 - test_kprobe
> ok 2 - test_kprobes
> ok 3 - test_kretprobe
> ok 4 - test_kretprobes
> ok 1 - kprobes_test
>
> Note that the kprobes testcases are no longer run immediately after
> kprobes initialization, but as a late initcall when kunit is
> initialized. kprobes itself is initialized with an early initcall,
> so the order is still correct.
>
Great! Thank you!
Acked-by: Masami Hiramatsu <mhiramat@...nel.org>
> Signed-off-by: Sven Schnelle <svens@...ux.ibm.com>
> ---
> kernel/kprobes.c | 3 -
> kernel/test_kprobes.c | 221 +++++++++++-------------------------------
> lib/Kconfig.debug | 1 +
> 3 files changed, 59 insertions(+), 166 deletions(-)
>
> diff --git a/kernel/kprobes.c b/kernel/kprobes.c
> index 790a573bbe00..adf6ed1932c2 100644
> --- a/kernel/kprobes.c
> +++ b/kernel/kprobes.c
> @@ -2508,9 +2508,6 @@ static int __init init_kprobes(void)
> err = register_module_notifier(&kprobe_module_nb);
>
> kprobes_initialized = (err == 0);
> -
> - if (!err)
> - init_test_probes();
> return err;
> }
> early_initcall(init_kprobes);
> diff --git a/kernel/test_kprobes.c b/kernel/test_kprobes.c
> index 76c997fdbc9d..3c481560f439 100644
> --- a/kernel/test_kprobes.c
> +++ b/kernel/test_kprobes.c
> @@ -5,18 +5,17 @@
> * Copyright IBM Corp. 2008
> */
>
> -#define pr_fmt(fmt) "Kprobe smoke test: " fmt
> -
> #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 int errors, handler_errors, num_tests;
> static u32 (*target)(u32 value);
> static u32 (*target2)(u32 value);
> +static struct kunit *current_test;
>
> static noinline u32 kprobe_target(u32 value)
> {
> @@ -25,10 +24,7 @@ static noinline u32 kprobe_target(u32 value)
>
> static int kp_pre_handler(struct kprobe *p, struct pt_regs *regs)
> {
> - if (preemptible()) {
> - handler_errors++;
> - pr_err("pre-handler is preemptible\n");
> - }
> + KUNIT_EXPECT_FALSE(current_test, preemptible());
> preh_val = (rand1 / div_factor);
> return 0;
> }
> @@ -36,14 +32,8 @@ static int kp_pre_handler(struct kprobe *p, struct pt_regs *regs)
> static void kp_post_handler(struct kprobe *p, struct pt_regs *regs,
> unsigned long flags)
> {
> - if (preemptible()) {
> - handler_errors++;
> - pr_err("post-handler is preemptible\n");
> - }
> - if (preh_val != (rand1 / div_factor)) {
> - handler_errors++;
> - pr_err("incorrect value in post_handler\n");
> - }
> + KUNIT_EXPECT_FALSE(current_test, preemptible());
> + KUNIT_EXPECT_EQ(current_test, preh_val, (rand1 / div_factor));
> posth_val = preh_val + div_factor;
> }
>
> @@ -53,30 +43,14 @@ static struct kprobe kp = {
> .post_handler = kp_post_handler
> };
>
> -static int test_kprobe(void)
> +static void test_kprobe(struct kunit *test)
> {
> - int ret;
> -
> - ret = register_kprobe(&kp);
> - if (ret < 0) {
> - pr_err("register_kprobe returned %d\n", ret);
> - return ret;
> - }
> -
> - ret = target(rand1);
> + current_test = test;
> + KUNIT_EXPECT_EQ(test, 0, register_kprobe(&kp));
> + target(rand1);
> unregister_kprobe(&kp);
> -
> - if (preh_val == 0) {
> - pr_err("kprobe pre_handler not called\n");
> - handler_errors++;
> - }
> -
> - if (posth_val == 0) {
> - pr_err("kprobe post_handler not called\n");
> - handler_errors++;
> - }
> -
> - return 0;
> + KUNIT_EXPECT_NE(test, 0, preh_val);
> + KUNIT_EXPECT_NE(test, 0, posth_val);
> }
>
> static noinline u32 kprobe_target2(u32 value)
> @@ -93,10 +67,7 @@ static int kp_pre_handler2(struct kprobe *p, struct pt_regs *regs)
> static void kp_post_handler2(struct kprobe *p, struct pt_regs *regs,
> unsigned long flags)
> {
> - if (preh_val != (rand1 / div_factor) + 1) {
> - handler_errors++;
> - pr_err("incorrect value in post_handler2\n");
> - }
> + KUNIT_EXPECT_EQ(current_test, preh_val, (rand1 / div_factor) + 1);
> posth_val = preh_val + div_factor;
> }
>
> @@ -106,51 +77,31 @@ static struct kprobe kp2 = {
> .post_handler = kp_post_handler2
> };
>
> -static int test_kprobes(void)
> +static void test_kprobes(struct kunit *test)
> {
> - int ret;
> struct kprobe *kps[2] = {&kp, &kp2};
>
> + current_test = test;
> +
> /* addr and flags should be cleard for reusing kprobe. */
> kp.addr = NULL;
> kp.flags = 0;
> - ret = register_kprobes(kps, 2);
> - if (ret < 0) {
> - pr_err("register_kprobes returned %d\n", ret);
> - return ret;
> - }
>
> + KUNIT_EXPECT_EQ(test, 0, register_kprobes(kps, 2));
> preh_val = 0;
> posth_val = 0;
> - ret = target(rand1);
> + target(rand1);
>
> - if (preh_val == 0) {
> - pr_err("kprobe pre_handler not called\n");
> - handler_errors++;
> - }
> -
> - if (posth_val == 0) {
> - pr_err("kprobe post_handler not called\n");
> - handler_errors++;
> - }
> + KUNIT_EXPECT_NE(test, 0, preh_val);
> + KUNIT_EXPECT_NE(test, 0, posth_val);
>
> preh_val = 0;
> posth_val = 0;
> - ret = target2(rand1);
> -
> - if (preh_val == 0) {
> - pr_err("kprobe pre_handler2 not called\n");
> - handler_errors++;
> - }
> -
> - if (posth_val == 0) {
> - pr_err("kprobe post_handler2 not called\n");
> - handler_errors++;
> - }
> + target2(rand1);
>
> + KUNIT_EXPECT_NE(test, 0, preh_val);
> + KUNIT_EXPECT_NE(test, 0, posth_val);
> unregister_kprobes(kps, 2);
> - return 0;
> -
> }
>
> #ifdef CONFIG_KRETPROBES
> @@ -158,10 +109,7 @@ static u32 krph_val;
>
> static int entry_handler(struct kretprobe_instance *ri, struct pt_regs *regs)
> {
> - if (preemptible()) {
> - handler_errors++;
> - pr_err("kretprobe entry handler is preemptible\n");
> - }
> + KUNIT_EXPECT_FALSE(current_test, preemptible());
> krph_val = (rand1 / div_factor);
> return 0;
> }
> @@ -170,19 +118,9 @@ static int return_handler(struct kretprobe_instance *ri, struct pt_regs *regs)
> {
> unsigned long ret = regs_return_value(regs);
>
> - if (preemptible()) {
> - handler_errors++;
> - pr_err("kretprobe return handler is preemptible\n");
> - }
> - if (ret != (rand1 / div_factor)) {
> - handler_errors++;
> - pr_err("incorrect value in kretprobe handler\n");
> - }
> - if (krph_val == 0) {
> - handler_errors++;
> - pr_err("call to kretprobe entry handler failed\n");
> - }
> -
> + 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;
> }
> @@ -193,39 +131,21 @@ static struct kretprobe rp = {
> .kp.symbol_name = "kprobe_target"
> };
>
> -static int test_kretprobe(void)
> +static void test_kretprobe(struct kunit *test)
> {
> - int ret;
> -
> - ret = register_kretprobe(&rp);
> - if (ret < 0) {
> - pr_err("register_kretprobe returned %d\n", ret);
> - return ret;
> - }
> -
> - ret = target(rand1);
> + current_test = test;
> + KUNIT_EXPECT_EQ(test, 0, register_kretprobe(&rp));
> + target(rand1);
> unregister_kretprobe(&rp);
> - if (krph_val != rand1) {
> - pr_err("kretprobe handler not called\n");
> - handler_errors++;
> - }
> -
> - return 0;
> + 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);
>
> - if (ret != (rand1 / div_factor) + 1) {
> - handler_errors++;
> - pr_err("incorrect value in kretprobe handler2\n");
> - }
> - if (krph_val == 0) {
> - handler_errors++;
> - pr_err("call to kretprobe entry handler failed\n");
> - }
> -
> + KUNIT_EXPECT_EQ(current_test, ret, (rand1 / div_factor) + 1);
> + KUNIT_EXPECT_NE(current_test, krph_val, 0);
> krph_val = rand1;
> return 0;
> }
> @@ -236,78 +156,53 @@ static struct kretprobe rp2 = {
> .kp.symbol_name = "kprobe_target2"
> };
>
> -static int test_kretprobes(void)
> +static void test_kretprobes(struct kunit *test)
> {
> - int ret;
> 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;
> - ret = register_kretprobes(rps, 2);
> - if (ret < 0) {
> - pr_err("register_kretprobe returned %d\n", ret);
> - return ret;
> - }
> + KUNIT_EXPECT_EQ(test, 0, register_kretprobes(rps, 2));
>
> krph_val = 0;
> - ret = target(rand1);
> - if (krph_val != rand1) {
> - pr_err("kretprobe handler not called\n");
> - handler_errors++;
> - }
> + target(rand1);
> + KUNIT_EXPECT_EQ(test, krph_val, rand1);
>
> krph_val = 0;
> - ret = target2(rand1);
> - if (krph_val != rand1) {
> - pr_err("kretprobe handler2 not called\n");
> - handler_errors++;
> - }
> + target2(rand1);
> + KUNIT_EXPECT_EQ(test, krph_val, rand1);
> unregister_kretprobes(rps, 2);
> - return 0;
> }
> #endif /* CONFIG_KRETPROBES */
>
> -int init_test_probes(void)
> +static int kprobes_test_init(struct kunit *test)
> {
> - int ret;
> -
> target = kprobe_target;
> target2 = kprobe_target2;
>
> do {
> rand1 = prandom_u32();
> } while (rand1 <= div_factor);
> + return 0;
> +}
>
> - pr_info("started\n");
> - num_tests++;
> - ret = test_kprobe();
> - if (ret < 0)
> - errors++;
> -
> - num_tests++;
> - ret = test_kprobes();
> - if (ret < 0)
> - errors++;
> -
> +static struct kunit_case kprobes_testcases[] = {
> + KUNIT_CASE(test_kprobe),
> + KUNIT_CASE(test_kprobes),
> #ifdef CONFIG_KRETPROBES
> - num_tests++;
> - ret = test_kretprobe();
> - if (ret < 0)
> - errors++;
> -
> - num_tests++;
> - ret = test_kretprobes();
> - if (ret < 0)
> - errors++;
> -#endif /* CONFIG_KRETPROBES */
> + KUNIT_CASE(test_kretprobe),
> + KUNIT_CASE(test_kretprobes),
> +#endif
> + {}
> +};
>
> - if (errors)
> - pr_err("BUG: %d out of %d tests failed\n", errors, num_tests);
> - else if (handler_errors)
> - pr_err("BUG: %d error(s) running handlers\n", handler_errors);
> - else
> - pr_info("passed successfully\n");
> +static struct kunit_suite kprobes_test_suite = {
> + .name = "kprobes_test",
> + .init = kprobes_test_init,
> + .test_cases = kprobes_testcases,
> +};
> +
> +kunit_test_suites(&kprobes_test_suite);
>
> - return 0;
> -}
> diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
> index ed4a31e34098..10dbed281a6a 100644
> --- a/lib/Kconfig.debug
> +++ b/lib/Kconfig.debug
> @@ -2083,6 +2083,7 @@ config KPROBES_SANITY_TEST
> bool "Kprobes sanity tests"
> depends on DEBUG_KERNEL
> depends on KPROBES
> + depends on KUNIT
> help
> This option provides for testing basic kprobes functionality on
> boot. Samples of kprobe and kretprobe are inserted and
> --
> 2.25.1
>
--
Masami Hiramatsu <mhiramat@...nel.org>
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