1 files changed, 389 insertions, 0 deletions
diff --git a/kernel/test_kprobes.c b/kernel/test_kprobes.c
new file mode 100644
index 000000000..0dbab6d1a
--- /dev/null
+++ b/kernel/test_kprobes.c
@@ -0,0 +1,389 @@
+/*
+ * test_kprobes.c - simple sanity test for *probes
+ *
+ * Copyright IBM Corp. 2008
+ *
+ * This program is free software;  you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it would be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
+ * the GNU General Public License for more details.
+ */
+
+#define pr_fmt(fmt) "Kprobe smoke test: " fmt
+
+#include <linux/kernel.h>
+#include <linux/kprobes.h>
+#include <linux/random.h>
+
+#define div_factor 3
+
+static u32 rand1, preh_val, posth_val, jph_val;
+static int errors, handler_errors, num_tests;
+static u32 (*target)(u32 value);
+static u32 (*target2)(u32 value);
+
+static noinline u32 kprobe_target(u32 value)
+{
+	return (value / div_factor);
+}
+
+static int kp_pre_handler(struct kprobe *p, struct pt_regs *regs)
+{
+	preh_val = (rand1 / div_factor);
+	return 0;
+}
+
+static void kp_post_handler(struct kprobe *p, struct pt_regs *regs,
+		unsigned long flags)
+{
+	if (preh_val != (rand1 / div_factor)) {
+		handler_errors++;
+		pr_err("incorrect value in post_handler\n");
+	}
+	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 int test_kprobe(void)
+{
+	int ret;
+
+	ret = register_kprobe(&kp);
+	if (ret < 0) {
+		pr_err("register_kprobe returned %d\n", ret);
+		return ret;
+	}
+
+	ret = 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;
+}
+
+static noinline u32 kprobe_target2(u32 value)
+{
+	return (value / div_factor) + 1;
+}
+
+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)
+{
+	if (preh_val != (rand1 / div_factor) + 1) {
+		handler_errors++;
+		pr_err("incorrect value in post_handler2\n");
+	}
+	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 int test_kprobes(void)
+{
+	int ret;
+	struct kprobe *kps[2] = {&kp, &kp2};
+
+	/* 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;
+	}
+
+	preh_val = 0;
+	posth_val = 0;
+	ret = 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++;
+	}
+
+	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++;
+	}
+
+	unregister_kprobes(kps, 2);
+	return 0;
+
+}
+
+static u32 j_kprobe_target(u32 value)
+{
+	if (value != rand1) {
+		handler_errors++;
+		pr_err("incorrect value in jprobe handler\n");
+	}
+
+	jph_val = rand1;
+	jprobe_return();
+	return 0;
+}
+
+static struct jprobe jp = {
+	.entry		= j_kprobe_target,
+	.kp.symbol_name = "kprobe_target"
+};
+
+static int test_jprobe(void)
+{
+	int ret;
+
+	ret = register_jprobe(&jp);
+	if (ret < 0) {
+		pr_err("register_jprobe returned %d\n", ret);
+		return ret;
+	}
+
+	ret = target(rand1);
+	unregister_jprobe(&jp);
+	if (jph_val == 0) {
+		pr_err("jprobe handler not called\n");
+		handler_errors++;
+	}
+
+	return 0;
+}
+
+static struct jprobe jp2 = {
+	.entry          = j_kprobe_target,
+	.kp.symbol_name = "kprobe_target2"
+};
+
+static int test_jprobes(void)
+{
+	int ret;
+	struct jprobe *jps[2] = {&jp, &jp2};
+
+	/* addr and flags should be cleard for reusing kprobe. */
+	jp.kp.addr = NULL;
+	jp.kp.flags = 0;
+	ret = register_jprobes(jps, 2);
+	if (ret < 0) {
+		pr_err("register_jprobes returned %d\n", ret);
+		return ret;
+	}
+
+	jph_val = 0;
+	ret = target(rand1);
+	if (jph_val == 0) {
+		pr_err("jprobe handler not called\n");
+		handler_errors++;
+	}
+
+	jph_val = 0;
+	ret = target2(rand1);
+	if (jph_val == 0) {
+		pr_err("jprobe handler2 not called\n");
+		handler_errors++;
+	}
+	unregister_jprobes(jps, 2);
+
+	return 0;
+}
+#ifdef CONFIG_KRETPROBES
+static u32 krph_val;
+
+static int entry_handler(struct kretprobe_instance *ri, struct pt_regs *regs)
+{
+	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);
+
+	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");
+	}
+
+	krph_val = rand1;
+	return 0;
+}
+
+static struct kretprobe rp = {
+	.handler	= return_handler,
+	.entry_handler  = entry_handler,
+	.kp.symbol_name = "kprobe_target"
+};
+
+static int test_kretprobe(void)
+{
+	int ret;
+
+	ret = register_kretprobe(&rp);
+	if (ret < 0) {
+		pr_err("register_kretprobe returned %d\n", ret);
+		return ret;
+	}
+
+	ret = target(rand1);
+	unregister_kretprobe(&rp);
+	if (krph_val != rand1) {
+		pr_err("kretprobe handler not called\n");
+		handler_errors++;
+	}
+
+	return 0;
+}
+
+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");
+	}
+
+	krph_val = rand1;
+	return 0;
+}
+
+static struct kretprobe rp2 = {
+	.handler	= return_handler2,
+	.entry_handler  = entry_handler,
+	.kp.symbol_name = "kprobe_target2"
+};
+
+static int test_kretprobes(void)
+{
+	int ret;
+	struct kretprobe *rps[2] = {&rp, &rp2};
+
+	/* 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;
+	}
+
+	krph_val = 0;
+	ret = target(rand1);
+	if (krph_val != rand1) {
+		pr_err("kretprobe handler not called\n");
+		handler_errors++;
+	}
+
+	krph_val = 0;
+	ret = target2(rand1);
+	if (krph_val != rand1) {
+		pr_err("kretprobe handler2 not called\n");
+		handler_errors++;
+	}
+	unregister_kretprobes(rps, 2);
+	return 0;
+}
+#endif /* CONFIG_KRETPROBES */
+
+int init_test_probes(void)
+{
+	int ret;
+
+	target = kprobe_target;
+	target2 = kprobe_target2;
+
+	do {
+		rand1 = prandom_u32();
+	} while (rand1 <= div_factor);
+
+	pr_info("started\n");
+	num_tests++;
+	ret = test_kprobe();
+	if (ret < 0)
+		errors++;
+
+	num_tests++;
+	ret = test_kprobes();
+	if (ret < 0)
+		errors++;
+
+	num_tests++;
+	ret = test_jprobe();
+	if (ret < 0)
+		errors++;
+
+	num_tests++;
+	ret = test_jprobes();
+	if (ret < 0)
+		errors++;
+
+#ifdef CONFIG_KRETPROBES
+	num_tests++;
+	ret = test_kretprobe();
+	if (ret < 0)
+		errors++;
+
+	num_tests++;
+	ret = test_kretprobes();
+	if (ret < 0)
+		errors++;
+#endif /* CONFIG_KRETPROBES */
+
+	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");
+
+	return 0;
+}