Commit 12da3b88 authored by Masami Hiramatsu's avatar Masami Hiramatsu Committed by Linus Torvalds
Browse files

kprobes: add tests for register_kprobes 



Add testcases for *probe batch registration (register_kprobes) to kprobes
sanity tests.

Signed-off-by: default avatarMasami Hiramatsu <mhiramat@redhat.com>
Acked-by: default avatarAnanth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Jim Keniston <jkenisto@us.ibm.com>
Cc: David Miller <davem@davemloft.net>
Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 8e114405

kernel/test_kprobes.c

+189 −0
Original line number Diff line number Diff line
@@ -23,6 +23,7 @@ 
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)

{
@@ -81,6 +82,84 @@ static int test_kprobe(void) 
	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++;

		printk(KERN_ERR "Kprobe smoke test failed: "

				"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};



	kp.addr = 0; /* addr should be cleard for reusing kprobe. */

	ret = register_kprobes(kps, 2);

	if (ret < 0) {

		printk(KERN_ERR "Kprobe smoke test failed: "

				"register_kprobes returned %d\n", ret);

		return ret;

	}



	preh_val = 0;

	posth_val = 0;

	ret = target(rand1);



	if (preh_val == 0) {

		printk(KERN_ERR "Kprobe smoke test failed: "

				"kprobe pre_handler not called\n");

		handler_errors++;

	}



	if (posth_val == 0) {

		printk(KERN_ERR "Kprobe smoke test failed: "

				"kprobe post_handler not called\n");

		handler_errors++;

	}



	preh_val = 0;

	posth_val = 0;

	ret = target2(rand1);



	if (preh_val == 0) {

		printk(KERN_ERR "Kprobe smoke test failed: "

				"kprobe pre_handler2 not called\n");

		handler_errors++;

	}



	if (posth_val == 0) {

		printk(KERN_ERR "Kprobe smoke test failed: "

				"kprobe post_handler2 not called\n");

		handler_errors++;

	}



	unregister_kprobes(kps, 2);

	return 0;



}



static u32 j_kprobe_target(u32 value)

{

	if (value != rand1) {
@@ -121,6 +200,43 @@ static int test_jprobe(void) 
	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};



	jp.kp.addr = 0; /* addr should be cleard for reusing kprobe. */

	ret = register_jprobes(jps, 2);

	if (ret < 0) {

		printk(KERN_ERR "Kprobe smoke test failed: "

				"register_jprobes returned %d\n", ret);

		return ret;

	}



	jph_val = 0;

	ret = target(rand1);

	if (jph_val == 0) {

		printk(KERN_ERR "Kprobe smoke test failed: "

				"jprobe handler not called\n");

		handler_errors++;

	}



	jph_val = 0;

	ret = target2(rand1);

	if (jph_val == 0) {

		printk(KERN_ERR "Kprobe smoke test failed: "

				"jprobe handler2 not called\n");

		handler_errors++;

	}

	unregister_jprobes(jps, 2);



	return 0;

}

#ifdef CONFIG_KRETPROBES

static u32 krph_val;
@@ -176,6 +292,63 @@ static int test_kretprobe(void) 


	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++;

		printk(KERN_ERR "Kprobe smoke test failed: "

				"incorrect value in kretprobe handler2\n");

	}

	if (krph_val == 0) {

		handler_errors++;

		printk(KERN_ERR "Kprobe smoke test failed: "

				"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};



	rp.kp.addr = 0; /* addr should be cleard for reusing kprobe. */

	ret = register_kretprobes(rps, 2);

	if (ret < 0) {

		printk(KERN_ERR "Kprobe smoke test failed: "

				"register_kretprobe returned %d\n", ret);

		return ret;

	}



	krph_val = 0;

	ret = target(rand1);

	if (krph_val != rand1) {

		printk(KERN_ERR "Kprobe smoke test failed: "

				"kretprobe handler not called\n");

		handler_errors++;

	}



	krph_val = 0;

	ret = target2(rand1);

	if (krph_val != rand1) {

		printk(KERN_ERR "Kprobe smoke test failed: "

				"kretprobe handler2 not called\n");

		handler_errors++;

	}

	unregister_kretprobes(rps, 2);

	return 0;

}

#endif /* CONFIG_KRETPROBES */



int init_test_probes(void)
@@ -183,6 +356,7 @@ int init_test_probes(void) 
	int ret;



	target = kprobe_target;

	target2 = kprobe_target2;



	do {

		rand1 = random32();
@@ -194,16 +368,31 @@ int init_test_probes(void) 
	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)

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